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encoding/xml: support for XML namespace prefixes #9519

Open
jordan2175 opened this issue Jan 6, 2015 · 29 comments
Open

encoding/xml: support for XML namespace prefixes #9519

jordan2175 opened this issue Jan 6, 2015 · 29 comments
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early-in-cycle A change that should be done early in the 3 month dev cycle. NeedsFix The path to resolution is known, but the work has not been done.
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@jordan2175
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Marshal-ing data back to XML does not seem to support namespace prefixes.. For example:

https://play.golang.org/p/6CY71H7mb4

The input XML is: <stix:STIX_Package>, but when it writes it back out it does <STIX_Package xmlns="stix">

Also, there does not appear to be any data elements like xml.Name for adding namespaces to a struct.... Something maybe like xml.NS????

@mikioh mikioh changed the title Support for XML namespace prefixes encoding/xml: Support for XML namespace prefixes Jan 6, 2015
@mikioh
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mikioh commented Jan 6, 2015

Dup of #6800

@mikioh mikioh closed this as completed Jan 6, 2015
@jordan2175
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I think what I am looking for, as I do more research on it, is for xml.Marshal to support prefixes

@jordan2175
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Here is some more details about this issue: If you run this code:

https://play.golang.org/p/EucDh59yiB

package main

import (
    "encoding/xml"
    "fmt"
)

type HouseType struct {
    XMLName   xml.Name `xml:"prefix11 House"`
    MessageId string   `xml:"message_id,attr"`
}

func main() {

    var tm HouseType
    tm.MessageId = "test1234"

    var data1 []byte
    data1, _ = xml.MarshalIndent(tm, "", "    ")

    fmt.Println("Marshal")
    fmt.Println(string(data1))

    rawxml := `<prefix11:House message_id="1466" in_response_to="1"></prefix11:House>`

    var tm2 HouseType
    xml.Unmarshal([]byte(rawxml), &tm2)
    fmt.Println("\nUnmarshal")
    fmt.Println("Message ID", tm2.MessageId)
}

It will print out:

Marshal
<House xmlns="prefix11" message_id="test1234"></House>

Unmarshal
Message ID 1466

You will see that the marshal command does not make use of the prefix correctly. It should be prefix11:House. If I change the struct to look like the following then the marshal command will work but the unmarshal will not. NOTE the ":" in the XMLName field. So I can either marshal or unmarshal, but not both with prefixed XML

https://play.golang.org/p/44CMHXb3YM

type HouseType struct {
    XMLName   xml.Name `xml:"prefix11:House"`
    MessageId string   `xml:"message_id,attr"`
}

Making this change, changes the output to:

Marshal
<prefix11:House message_id="test1234"></prefix11:House>

Unmarshal
Message ID

@rsc
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rsc commented Jul 23, 2015

See #11841.

@gopherbot
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CL https://golang.org/cl/12570 mentions this issue.

rsc added a commit that referenced this issue Jul 27, 2015
There is clearly work to do here with respect to xml name spaces,
but I don't believe the changes in this cycle are clearly correct.
The changes in this cycle have visible impact on the generated xml,
possibly breaking existing programs, and yet it's not clear that they
are the end of the story: there is still significant confusion about how
name spaces work or should work (see #9519, #9775, #8167, #7113).

I would like to wait to make breaking changes until we completely
understand what the behavior should be and can evaluate the benefit
of those breaking changes. My main concern here is that we will break
programs in Go 1.5 for the sake of name space adjustments and then
while trying to fix those other bugs we'll break programs in Go 1.6 too.
Let's wait until we know all the changes we want to make before we
decide whether or how to break existing programs.

This CL reverts:

5ae822b encoding/xml: minor changes
bb7e665 encoding/xml: fix xmlns= behavior
9f9d66d encoding/xml: fix default namespace of tags
b69ea01 encoding/xml: fix namespaces in a>b tags
3be158d encoding/xml: encoding name spaces correctly

and adjusts tests from

a9dddb5 encoding/xml: add more EncodeToken tests.

to expect Go 1.4 behavior.

I have confirmed that the name space parts of the test suite
as of this CL passes against the Go 1.4 encoding/xml package,
indicating that this CL successfully restores the Go 1.4 behavior.

(Other tests do not, but that's because there were some real
bug fixes in this cycle that are being kept. Specifically, the
tests that don't pass in Go 1.4 are TestMarshal's NestedAndComment
case, TestEncodeToken's encoding of newlines, and
TestSimpleUseOfEncodeToken returning an error for invalid
token types.)

I also checked that the Go 1.4 tests pass when run against
this copy of the sources.

Fixes #11841.

Change-Id: I97de06761038b40388ef6e3a55547ff43edee7cb
Reviewed-on: https://go-review.googlesource.com/12570
Reviewed-by: Nigel Tao <nigeltao@golang.org>
@rsc rsc changed the title encoding/xml: Support for XML namespace prefixes encoding/xml: support for XML namespace prefixes Nov 5, 2015
@rsc
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rsc commented Nov 25, 2015

Blocked on #13400.

@rsc rsc modified the milestones: Go1.7, Go1.6 Nov 25, 2015
@rsc rsc modified the milestones: Go1.8, Go1.7 May 18, 2016
@rothskeller
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Just a note in support of this proposal: with encoding/xml as it stands, it is infeasible to interact with SOAP web services that use digitally signed requests. This is because XML digital signatures require the XML to be in canonical form, which requires a greater degree of control over namespaces than encoding/xml provides. Admittedly, calling a SOAP service from a Go program is kind of like towing a trailer behind your Ferrari, but sometimes interoperability with legacy systems is essential.

@vania-pooh
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vania-pooh commented Oct 7, 2016

Just a workaround while waiting for a fix:

type Data ...

type Root struct {
    XMLName  xml.Name  `xml:"prefix:root"`
    XmlNS    string    `xml:"xmlns:prefix,attr"`
    Data Data `xml:"data"`
}

root := Root {
    XmlNS: "urn:test.example.com",
    Data: ...,
}

b, err := xml.MarshalIndent(root, "", "    ")

This will produce the following:

<prefix:root xmlns:prefix="urn:test.example.com"/>
    <data>...</data>
</prefix:root>

@quentinmit quentinmit added the NeedsFix The path to resolution is known, but the work has not been done. label Oct 7, 2016
ydnar added a commit to ydnar/go that referenced this issue Apr 28, 2023
All issues of golang#13400 which are not new functionalities have fixes.
There are minor incompatibilities between them due to the handling of
prefixes. Duplicating a prefix or an namespace is invalid XML.
This is now avoided. XML produced is always valid.

Tests have been added for each fix and example and previous tests
fixed as output is already more compact is some cases.

encoding/xml: fix duplication of namespace tags by encoder (golang#7535)

A tag prefix identifies the name space of the tag and not the default name
space like xmlns="...". Writing the prefix is incorrect when it is bound
to a name space using the standard xmlns:prefix="..." attribute.
This fix skips this print.

Consequences are
 - duplication is avoided in line with name space standard in reference.
 - the _xmlns declaration does not appear anymore. To keep the previous
behaviour, the prefix is printed in all other cases. Token now always
produces well-formed XML except when the explicit name space collides
with the prefix.

Made prefix handling "xmlns="space" xmlns:_xmlns="xmlns" _..." has
be removed in all wants of tests. In some cases, useless declarations like
xmlns:x="x" are still added in line with previous behavior.

encoding/xml: fix unexpected behavior of encoder.Indent("", "") (golang#13185, golang#11431)

MarshalIndent and Marshal share code. When prefix and indent are
empty, the behavior is like Marshal when it should have a minimal
indent, i.e. new line as in documentation.

A boolean is added to the local printer struct which defaults to false.
It is set to true only when MarshalIndent is used and prefix and indent
are empty.

encoding/xml: fix overriding by empty namespace (golang#7113)

The namespace defined by xmlns="value" can be overridden in
every included tag including by the empty namespace xmlns="".
Empty namespace is not authorized with a prefix (xmlns:ns="").

Method to calculate indent of XML handles depth of tag and
its associated namespace. The fix leaves the method active even
when no indent is required.

An XMLName field in a struct means that namespace must be
enforced even if empty. This occurs only on an inner tag as an
overwrite of any non-empty namespace of its outer tag.

To obtain the xmlns="" required, an attribute is added.

encoding/xml: fix panic on embedded unexported XMLName (golang#10538)

By laws of reflection, unexported fields are unreachable by .Value.
XMLName are allowed at any level of an inner struct but the struct
may not be reachable. If XMLName field is found without name,
it cannot be exported and the value is discarded like other fields.
Some comments have been to underline where the issue arises.
Another XMLName test was incorrectly set up and is fixed.
Various cases added in a specific test.

encoding/xml: fix panic of unmarshaling of anonymous structs (golang#16497)

Encoding/xml is using type "typinfo" which provides its own "value" method
using the reflection package. It fails to check for the documented possible
panics of the reflection methods. It is impossible to fix the method as the
parameter is also using reflection.

The fix is to discard anonymous structs which have no value anyway.
Encoder/xml documentation already mentions that fields are accessed using
the reflection package. A relevant test is added.

encoding/xml: fix closing tag failure (golang#20685)

Push/pop of elements name must be done using the eventual prefix together
with the tag name. The operation is moved before the translation of prefix
into its URI. One end element of a test is fixed as expecting the last used
namespace is incorrect.
After closing a tag using a namespace, the valid namespace must be taken
from the opening tag.

encoding/xml: add check of namespaces to detect field names conflicts (golang#8535, golang#11724)

Comparing namespaces of fields was missing and false conflicts were detected.

encoding/xml: fix invalid empty namespace without prefix (golang#8068)

Empty namespace is allowed only if it has no prefix. An error message is now
returned if a prefix exists. A similar case when no prefix is provided,
thus with syntax xmlns:="..." is also rejected.

encoding/xml: fix normalization of attributes values (golang#20614)

The attribute value was read as text. The existing attribute reader logic is
fixed as an attribute may have a namespace or only a prefix. Other
possibilities have been removed.

To keep the behavior of raw token which allows many faults in attributes list,
error handling is heavily using the Strict parameter of the decoder.
Specific tests have been added including list of attributes.

To keep the behavior or unmarshal, escaped characters handling has been
added but it is not symmetrical to Marshal for quotes but follows XML
specification.

encoding/xml: fix absence of detection of another : in qualified names (golang#20396)

The occurrence of second : in space and tag name is rejected.

Fixes: golang#7113, golang#7535, golang#8068, golang#8535, golang#10538, golang#11431, golang#13185, golang#16497, golang#20396, golang#20614, golang#20685

Change-Id: Ib4a60347a47d23ff59b63307cebb83b71c7c9165

Commit originally authored by: Constantin Konstantinidis <constantinkonstantinidis@gmail.com>

encoding/xml: fix printing of namespace prefix in tag names

Prefix displays in XML when defined in tag names.
The URL of the name space is also returned for an End Token as
documentation requires to improve idempotency of Marshal/Unmarshal.

Translating the prefix is popping the NS which was unavailable
for translation. Translate for an End Token has been moved inside
the pop element part.

Fixes golang#9519

Change-Id: Id7a14d07c106a76a487b5c4e28d9d563fe061c60

encoding/xml: restore changes lost in merge

See golang#43168.

encoding/xml: gofmt

encoding/xml: minimalIndent -> minIndent to shrink diff

encoding/xml: gofmt

encoding/xml: revert changes to (*Decoder).attrval from master

encoding/xml: restore (*printer).writeIndent to master

encoding/xml: remove comments that don’t change functionality of tests

encoding/xml: use t.Errorf instead of fmt.Errorf

encoding/xml: fix test case for golang#11496

encoding/xml: revert unrelated change in (*Decoder).readName

encoding/xml: remove comments

encoding/xml: remove comments

encoding/xml: edit comments

encoding/xml: add test to ensure '@' is legal in an attr val

encoding/xml: improve test error quoting for readability

encoding/xml: (*Decoder).nsname now strictly parses namespaces

encoding/xml: disable 3/4 tests for golang#43168

I’m not sure what the right fix is for this. Malformed namespaces
(leading or trailing colons, more than 1 colon) should result in an error.

encoding/xml: allow callers to specify namespace prefix

A preferred namespace prefix can now be specified by setting the local
name space to "prefix:space".

In a struct tag:

struct Message {
    XMLName struct{} `xml:"urn:ietf:foo foo:message"`
    Value string `xml:"urn:ietf:foo foo:value"`
}

encoding/xml: use tag prefixes if previously defined

Instead of having redundant xmlns= attrs.

encoding/xml: rename (*printer).popPrefix to popPrefixes

since it pops 1 or more prefixes

encoding/xml: rename printer struct fields

To reflect the fact that prefixes apply to tag names, not just attrs.

encoding/xml: url->uri; reorg comments

encoding/xml: fix comments

encoding/xml: elide redundant xmlns= attrs for default namespace (no prefix)

encoding/xml: move namespace prefix tests

encoding/xml: handle namespace prefixes at the root element

encoding/xml: handle namespaced prefixed attr names

encoding/xml: split out prefixes during reflection, not parsing

encoding/xml: rename tagName to xmlTag; document it

encoding/xml: separate printing xmlns:prefix= attr from creating prefix

encoding/xml: clean up comments

encoding/xml: don’t use xmlTag in attr serialization

encoding/xml: test nested prefixed namespaced tags

encoding/xml: add test for prefixed XML tags without xmlns

encoding/xml: update doc comments

encoding/xml: update comments

encoding/xml: preemptively declare and record all namespace prefixes

Immediate children of XML tags that share a namespace and prefix will now
have that namespace prefix declared on the parent tag.

Explicitly declared namespace prefixes via xmlns:prefix="uri" attributes
will now have their values recorded and reused for marshalling child tags.

This commit reorganizes how namespace prefixes are recorded and detected,
along with how start tags are recorded via a slice of element structs.

Some tests are changed, because the value of the marshalled XML has changed,
but the resulting XML should be equivalent (and correct).

encoding/xml: restore tests with xmlns:prefix= attrs to existing behavior

Use xmlnsURL instead of xmlnsPrefix to specify namespace prefixes.

encoding/xml: prefer unprefixed names where possible

encoding/xml: add EncodeToken tests for explicit prefixes

encoding/xml: add test cases for prefixed local names

encoding/xml: revert change in 8f143f5277; do not preemptively declare XML namespaces
ydnar added a commit to ydnar/go that referenced this issue May 1, 2023
All issues of golang#13400 which are not new functionalities have fixes.
There are minor incompatibilities between them due to the handling of
prefixes. Duplicating a prefix or an namespace is invalid XML.
This is now avoided. XML produced is always valid.

Tests have been added for each fix and example and previous tests
fixed as output is already more compact is some cases.

encoding/xml: fix duplication of namespace tags by encoder (golang#7535)

A tag prefix identifies the name space of the tag and not the default name
space like xmlns="...". Writing the prefix is incorrect when it is bound
to a name space using the standard xmlns:prefix="..." attribute.
This fix skips this print.

Consequences are
 - duplication is avoided in line with name space standard in reference.
 - the _xmlns declaration does not appear anymore. To keep the previous
behaviour, the prefix is printed in all other cases. Token now always
produces well-formed XML except when the explicit name space collides
with the prefix.

Made prefix handling "xmlns="space" xmlns:_xmlns="xmlns" _..." has
be removed in all wants of tests. In some cases, useless declarations like
xmlns:x="x" are still added in line with previous behavior.

encoding/xml: fix unexpected behavior of encoder.Indent("", "") (golang#13185, golang#11431)

MarshalIndent and Marshal share code. When prefix and indent are
empty, the behavior is like Marshal when it should have a minimal
indent, i.e. new line as in documentation.

A boolean is added to the local printer struct which defaults to false.
It is set to true only when MarshalIndent is used and prefix and indent
are empty.

encoding/xml: fix overriding by empty namespace (golang#7113)

The namespace defined by xmlns="value" can be overridden in
every included tag including by the empty namespace xmlns="".
Empty namespace is not authorized with a prefix (xmlns:ns="").

Method to calculate indent of XML handles depth of tag and
its associated namespace. The fix leaves the method active even
when no indent is required.

An XMLName field in a struct means that namespace must be
enforced even if empty. This occurs only on an inner tag as an
overwrite of any non-empty namespace of its outer tag.

To obtain the xmlns="" required, an attribute is added.

encoding/xml: fix panic on embedded unexported XMLName (golang#10538)

By laws of reflection, unexported fields are unreachable by .Value.
XMLName are allowed at any level of an inner struct but the struct
may not be reachable. If XMLName field is found without name,
it cannot be exported and the value is discarded like other fields.
Some comments have been to underline where the issue arises.
Another XMLName test was incorrectly set up and is fixed.
Various cases added in a specific test.

encoding/xml: fix panic of unmarshaling of anonymous structs (golang#16497)

Encoding/xml is using type "typinfo" which provides its own "value" method
using the reflection package. It fails to check for the documented possible
panics of the reflection methods. It is impossible to fix the method as the
parameter is also using reflection.

The fix is to discard anonymous structs which have no value anyway.
Encoder/xml documentation already mentions that fields are accessed using
the reflection package. A relevant test is added.

encoding/xml: fix closing tag failure (golang#20685)

Push/pop of elements name must be done using the eventual prefix together
with the tag name. The operation is moved before the translation of prefix
into its URI. One end element of a test is fixed as expecting the last used
namespace is incorrect.
After closing a tag using a namespace, the valid namespace must be taken
from the opening tag.

encoding/xml: add check of namespaces to detect field names conflicts (golang#8535, golang#11724)

Comparing namespaces of fields was missing and false conflicts were detected.

encoding/xml: fix invalid empty namespace without prefix (golang#8068)

Empty namespace is allowed only if it has no prefix. An error message is now
returned if a prefix exists. A similar case when no prefix is provided,
thus with syntax xmlns:="..." is also rejected.

encoding/xml: fix normalization of attributes values (golang#20614)

The attribute value was read as text. The existing attribute reader logic is
fixed as an attribute may have a namespace or only a prefix. Other
possibilities have been removed.

To keep the behavior of raw token which allows many faults in attributes list,
error handling is heavily using the Strict parameter of the decoder.
Specific tests have been added including list of attributes.

To keep the behavior or unmarshal, escaped characters handling has been
added but it is not symmetrical to Marshal for quotes but follows XML
specification.

encoding/xml: fix absence of detection of another : in qualified names (golang#20396)

The occurrence of second : in space and tag name is rejected.

Fixes: golang#7113, golang#7535, golang#8068, golang#8535, golang#10538, golang#11431, golang#13185, golang#16497, golang#20396, golang#20614, golang#20685

Change-Id: Ib4a60347a47d23ff59b63307cebb83b71c7c9165

Commit originally authored by: Constantin Konstantinidis <constantinkonstantinidis@gmail.com>

encoding/xml: fix printing of namespace prefix in tag names

Prefix displays in XML when defined in tag names.
The URL of the name space is also returned for an End Token as
documentation requires to improve idempotency of Marshal/Unmarshal.

Translating the prefix is popping the NS which was unavailable
for translation. Translate for an End Token has been moved inside
the pop element part.

Fixes golang#9519

Change-Id: Id7a14d07c106a76a487b5c4e28d9d563fe061c60

encoding/xml: restore changes lost in merge

See golang#43168.

encoding/xml: gofmt

encoding/xml: minimalIndent -> minIndent to shrink diff

encoding/xml: gofmt

encoding/xml: revert changes to (*Decoder).attrval from master

encoding/xml: restore (*printer).writeIndent to master

encoding/xml: remove comments that don’t change functionality of tests

encoding/xml: use t.Errorf instead of fmt.Errorf

encoding/xml: fix test case for golang#11496

encoding/xml: revert unrelated change in (*Decoder).readName

encoding/xml: remove comments

encoding/xml: remove comments

encoding/xml: edit comments

encoding/xml: add test to ensure '@' is legal in an attr val

encoding/xml: improve test error quoting for readability

encoding/xml: (*Decoder).nsname now strictly parses namespaces

encoding/xml: disable 3/4 tests for golang#43168

I’m not sure what the right fix is for this. Malformed namespaces
(leading or trailing colons, more than 1 colon) should result in an error.

encoding/xml: allow callers to specify namespace prefix

A preferred namespace prefix can now be specified by setting the local
name space to "prefix:space".

In a struct tag:

struct Message {
    XMLName struct{} `xml:"urn:ietf:foo foo:message"`
    Value string `xml:"urn:ietf:foo foo:value"`
}

encoding/xml: use tag prefixes if previously defined

Instead of having redundant xmlns= attrs.

encoding/xml: rename (*printer).popPrefix to popPrefixes

since it pops 1 or more prefixes

encoding/xml: rename printer struct fields

To reflect the fact that prefixes apply to tag names, not just attrs.

encoding/xml: url->uri; reorg comments

encoding/xml: fix comments

encoding/xml: elide redundant xmlns= attrs for default namespace (no prefix)

encoding/xml: move namespace prefix tests

encoding/xml: handle namespace prefixes at the root element

encoding/xml: handle namespaced prefixed attr names

encoding/xml: split out prefixes during reflection, not parsing

encoding/xml: rename tagName to xmlTag; document it

encoding/xml: separate printing xmlns:prefix= attr from creating prefix

encoding/xml: clean up comments

encoding/xml: don’t use xmlTag in attr serialization

encoding/xml: test nested prefixed namespaced tags

encoding/xml: add test for prefixed XML tags without xmlns

encoding/xml: update doc comments

encoding/xml: update comments

encoding/xml: preemptively declare and record all namespace prefixes

Immediate children of XML tags that share a namespace and prefix will now
have that namespace prefix declared on the parent tag.

Explicitly declared namespace prefixes via xmlns:prefix="uri" attributes
will now have their values recorded and reused for marshalling child tags.

This commit reorganizes how namespace prefixes are recorded and detected,
along with how start tags are recorded via a slice of element structs.

Some tests are changed, because the value of the marshalled XML has changed,
but the resulting XML should be equivalent (and correct).

encoding/xml: restore tests with xmlns:prefix= attrs to existing behavior

Use xmlnsURL instead of xmlnsPrefix to specify namespace prefixes.

encoding/xml: prefer unprefixed names where possible

encoding/xml: add EncodeToken tests for explicit prefixes

encoding/xml: add test cases for prefixed local names

encoding/xml: revert change in 8f143f5277; do not preemptively declare XML namespaces
ydnar added a commit to ydnar/go that referenced this issue May 1, 2023
All issues of golang#13400 which are not new functionalities have fixes.
There are minor incompatibilities between them due to the handling of
prefixes. Duplicating a prefix or an namespace is invalid XML.
This is now avoided. XML produced is always valid.

Tests have been added for each fix and example and previous tests
fixed as output is already more compact is some cases.

encoding/xml: fix duplication of namespace tags by encoder (golang#7535)

A tag prefix identifies the name space of the tag and not the default name
space like xmlns="...". Writing the prefix is incorrect when it is bound
to a name space using the standard xmlns:prefix="..." attribute.
This fix skips this print.

Consequences are
 - duplication is avoided in line with name space standard in reference.
 - the _xmlns declaration does not appear anymore. To keep the previous
behaviour, the prefix is printed in all other cases. Token now always
produces well-formed XML except when the explicit name space collides
with the prefix.

Made prefix handling "xmlns="space" xmlns:_xmlns="xmlns" _..." has
be removed in all wants of tests. In some cases, useless declarations like
xmlns:x="x" are still added in line with previous behavior.

encoding/xml: fix unexpected behavior of encoder.Indent("", "") (golang#13185, golang#11431)

MarshalIndent and Marshal share code. When prefix and indent are
empty, the behavior is like Marshal when it should have a minimal
indent, i.e. new line as in documentation.

A boolean is added to the local printer struct which defaults to false.
It is set to true only when MarshalIndent is used and prefix and indent
are empty.

encoding/xml: fix overriding by empty namespace (golang#7113)

The namespace defined by xmlns="value" can be overridden in
every included tag including by the empty namespace xmlns="".
Empty namespace is not authorized with a prefix (xmlns:ns="").

Method to calculate indent of XML handles depth of tag and
its associated namespace. The fix leaves the method active even
when no indent is required.

An XMLName field in a struct means that namespace must be
enforced even if empty. This occurs only on an inner tag as an
overwrite of any non-empty namespace of its outer tag.

To obtain the xmlns="" required, an attribute is added.

encoding/xml: fix panic on embedded unexported XMLName (golang#10538)

By laws of reflection, unexported fields are unreachable by .Value.
XMLName are allowed at any level of an inner struct but the struct
may not be reachable. If XMLName field is found without name,
it cannot be exported and the value is discarded like other fields.
Some comments have been to underline where the issue arises.
Another XMLName test was incorrectly set up and is fixed.
Various cases added in a specific test.

encoding/xml: fix panic of unmarshaling of anonymous structs (golang#16497)

Encoding/xml is using type "typinfo" which provides its own "value" method
using the reflection package. It fails to check for the documented possible
panics of the reflection methods. It is impossible to fix the method as the
parameter is also using reflection.

The fix is to discard anonymous structs which have no value anyway.
Encoder/xml documentation already mentions that fields are accessed using
the reflection package. A relevant test is added.

encoding/xml: fix closing tag failure (golang#20685)

Push/pop of elements name must be done using the eventual prefix together
with the tag name. The operation is moved before the translation of prefix
into its URI. One end element of a test is fixed as expecting the last used
namespace is incorrect.
After closing a tag using a namespace, the valid namespace must be taken
from the opening tag.

encoding/xml: add check of namespaces to detect field names conflicts (golang#8535, golang#11724)

Comparing namespaces of fields was missing and false conflicts were detected.

encoding/xml: fix invalid empty namespace without prefix (golang#8068)

Empty namespace is allowed only if it has no prefix. An error message is now
returned if a prefix exists. A similar case when no prefix is provided,
thus with syntax xmlns:="..." is also rejected.

encoding/xml: fix normalization of attributes values (golang#20614)

The attribute value was read as text. The existing attribute reader logic is
fixed as an attribute may have a namespace or only a prefix. Other
possibilities have been removed.

To keep the behavior of raw token which allows many faults in attributes list,
error handling is heavily using the Strict parameter of the decoder.
Specific tests have been added including list of attributes.

To keep the behavior or unmarshal, escaped characters handling has been
added but it is not symmetrical to Marshal for quotes but follows XML
specification.

encoding/xml: fix absence of detection of another : in qualified names (golang#20396)

The occurrence of second : in space and tag name is rejected.

Fixes: golang#7113, golang#7535, golang#8068, golang#8535, golang#10538, golang#11431, golang#13185, golang#16497, golang#20396, golang#20614, golang#20685

Change-Id: Ib4a60347a47d23ff59b63307cebb83b71c7c9165

Commit originally authored by: Constantin Konstantinidis <constantinkonstantinidis@gmail.com>

encoding/xml: fix printing of namespace prefix in tag names

Prefix displays in XML when defined in tag names.
The URL of the name space is also returned for an End Token as
documentation requires to improve idempotency of Marshal/Unmarshal.

Translating the prefix is popping the NS which was unavailable
for translation. Translate for an End Token has been moved inside
the pop element part.

Fixes golang#9519

Change-Id: Id7a14d07c106a76a487b5c4e28d9d563fe061c60

encoding/xml: restore changes lost in merge

See golang#43168.

encoding/xml: gofmt

encoding/xml: minimalIndent -> minIndent to shrink diff

encoding/xml: gofmt

encoding/xml: revert changes to (*Decoder).attrval from master

encoding/xml: restore (*printer).writeIndent to master

encoding/xml: remove comments that don’t change functionality of tests

encoding/xml: use t.Errorf instead of fmt.Errorf

encoding/xml: fix test case for golang#11496

encoding/xml: revert unrelated change in (*Decoder).readName

encoding/xml: remove comments

encoding/xml: remove comments

encoding/xml: edit comments

encoding/xml: add test to ensure '@' is legal in an attr val

encoding/xml: improve test error quoting for readability

encoding/xml: (*Decoder).nsname now strictly parses namespaces

encoding/xml: disable 3/4 tests for golang#43168

I’m not sure what the right fix is for this. Malformed namespaces
(leading or trailing colons, more than 1 colon) should result in an error.

encoding/xml: allow callers to specify namespace prefix

A preferred namespace prefix can now be specified by setting the local
name space to "prefix:space".

In a struct tag:

struct Message {
    XMLName struct{} `xml:"urn:ietf:foo foo:message"`
    Value string `xml:"urn:ietf:foo foo:value"`
}

encoding/xml: use tag prefixes if previously defined

Instead of having redundant xmlns= attrs.

encoding/xml: rename (*printer).popPrefix to popPrefixes

since it pops 1 or more prefixes

encoding/xml: rename printer struct fields

To reflect the fact that prefixes apply to tag names, not just attrs.

encoding/xml: url->uri; reorg comments

encoding/xml: fix comments

encoding/xml: elide redundant xmlns= attrs for default namespace (no prefix)

encoding/xml: move namespace prefix tests

encoding/xml: handle namespace prefixes at the root element

encoding/xml: handle namespaced prefixed attr names

encoding/xml: split out prefixes during reflection, not parsing

encoding/xml: rename tagName to xmlTag; document it

encoding/xml: separate printing xmlns:prefix= attr from creating prefix

encoding/xml: clean up comments

encoding/xml: don’t use xmlTag in attr serialization

encoding/xml: test nested prefixed namespaced tags

encoding/xml: add test for prefixed XML tags without xmlns

encoding/xml: update doc comments

encoding/xml: update comments

encoding/xml: preemptively declare and record all namespace prefixes

Immediate children of XML tags that share a namespace and prefix will now
have that namespace prefix declared on the parent tag.

Explicitly declared namespace prefixes via xmlns:prefix="uri" attributes
will now have their values recorded and reused for marshalling child tags.

This commit reorganizes how namespace prefixes are recorded and detected,
along with how start tags are recorded via a slice of element structs.

Some tests are changed, because the value of the marshalled XML has changed,
but the resulting XML should be equivalent (and correct).

encoding/xml: restore tests with xmlns:prefix= attrs to existing behavior

Use xmlnsURL instead of xmlnsPrefix to specify namespace prefixes.

encoding/xml: prefer unprefixed names where possible

encoding/xml: add EncodeToken tests for explicit prefixes

encoding/xml: add test cases for prefixed local names

encoding/xml: revert change in 8f143f5277; do not preemptively declare XML namespaces
ydnar added a commit to ydnar/go that referenced this issue May 1, 2023
All issues of golang#13400 which are not new functionalities have fixes.
There are minor incompatibilities between them due to the handling of
prefixes. Duplicating a prefix or an namespace is invalid XML.
This is now avoided. XML produced is always valid.

Tests have been added for each fix and example and previous tests
fixed as output is already more compact is some cases.

encoding/xml: fix duplication of namespace tags by encoder (golang#7535)

A tag prefix identifies the name space of the tag and not the default name
space like xmlns="...". Writing the prefix is incorrect when it is bound
to a name space using the standard xmlns:prefix="..." attribute.
This fix skips this print.

Consequences are
 - duplication is avoided in line with name space standard in reference.
 - the _xmlns declaration does not appear anymore. To keep the previous
behaviour, the prefix is printed in all other cases. Token now always
produces well-formed XML except when the explicit name space collides
with the prefix.

Made prefix handling "xmlns="space" xmlns:_xmlns="xmlns" _..." has
be removed in all wants of tests. In some cases, useless declarations like
xmlns:x="x" are still added in line with previous behavior.

encoding/xml: fix unexpected behavior of encoder.Indent("", "") (golang#13185, golang#11431)

MarshalIndent and Marshal share code. When prefix and indent are
empty, the behavior is like Marshal when it should have a minimal
indent, i.e. new line as in documentation.

A boolean is added to the local printer struct which defaults to false.
It is set to true only when MarshalIndent is used and prefix and indent
are empty.

encoding/xml: fix overriding by empty namespace (golang#7113)

The namespace defined by xmlns="value" can be overridden in
every included tag including by the empty namespace xmlns="".
Empty namespace is not authorized with a prefix (xmlns:ns="").

Method to calculate indent of XML handles depth of tag and
its associated namespace. The fix leaves the method active even
when no indent is required.

An XMLName field in a struct means that namespace must be
enforced even if empty. This occurs only on an inner tag as an
overwrite of any non-empty namespace of its outer tag.

To obtain the xmlns="" required, an attribute is added.

encoding/xml: fix panic on embedded unexported XMLName (golang#10538)

By laws of reflection, unexported fields are unreachable by .Value.
XMLName are allowed at any level of an inner struct but the struct
may not be reachable. If XMLName field is found without name,
it cannot be exported and the value is discarded like other fields.
Some comments have been to underline where the issue arises.
Another XMLName test was incorrectly set up and is fixed.
Various cases added in a specific test.

encoding/xml: fix panic of unmarshaling of anonymous structs (golang#16497)

Encoding/xml is using type "typinfo" which provides its own "value" method
using the reflection package. It fails to check for the documented possible
panics of the reflection methods. It is impossible to fix the method as the
parameter is also using reflection.

The fix is to discard anonymous structs which have no value anyway.
Encoder/xml documentation already mentions that fields are accessed using
the reflection package. A relevant test is added.

encoding/xml: fix closing tag failure (golang#20685)

Push/pop of elements name must be done using the eventual prefix together
with the tag name. The operation is moved before the translation of prefix
into its URI. One end element of a test is fixed as expecting the last used
namespace is incorrect.
After closing a tag using a namespace, the valid namespace must be taken
from the opening tag.

encoding/xml: add check of namespaces to detect field names conflicts (golang#8535, golang#11724)

Comparing namespaces of fields was missing and false conflicts were detected.

encoding/xml: fix invalid empty namespace without prefix (golang#8068)

Empty namespace is allowed only if it has no prefix. An error message is now
returned if a prefix exists. A similar case when no prefix is provided,
thus with syntax xmlns:="..." is also rejected.

encoding/xml: fix normalization of attributes values (golang#20614)

The attribute value was read as text. The existing attribute reader logic is
fixed as an attribute may have a namespace or only a prefix. Other
possibilities have been removed.

To keep the behavior of raw token which allows many faults in attributes list,
error handling is heavily using the Strict parameter of the decoder.
Specific tests have been added including list of attributes.

To keep the behavior or unmarshal, escaped characters handling has been
added but it is not symmetrical to Marshal for quotes but follows XML
specification.

encoding/xml: fix absence of detection of another : in qualified names (golang#20396)

The occurrence of second : in space and tag name is rejected.

Fixes: golang#7113, golang#7535, golang#8068, golang#8535, golang#10538, golang#11431, golang#13185, golang#16497, golang#20396, golang#20614, golang#20685

Change-Id: Ib4a60347a47d23ff59b63307cebb83b71c7c9165

Commit originally authored by: Constantin Konstantinidis <constantinkonstantinidis@gmail.com>

encoding/xml: fix printing of namespace prefix in tag names

Prefix displays in XML when defined in tag names.
The URL of the name space is also returned for an End Token as
documentation requires to improve idempotency of Marshal/Unmarshal.

Translating the prefix is popping the NS which was unavailable
for translation. Translate for an End Token has been moved inside
the pop element part.

Fixes golang#9519

Change-Id: Id7a14d07c106a76a487b5c4e28d9d563fe061c60

encoding/xml: restore changes lost in merge

See golang#43168.

encoding/xml: gofmt

encoding/xml: minimalIndent -> minIndent to shrink diff

encoding/xml: gofmt

encoding/xml: revert changes to (*Decoder).attrval from master

encoding/xml: restore (*printer).writeIndent to master

encoding/xml: remove comments that don’t change functionality of tests

encoding/xml: use t.Errorf instead of fmt.Errorf

encoding/xml: fix test case for golang#11496

encoding/xml: revert unrelated change in (*Decoder).readName

encoding/xml: remove comments

encoding/xml: remove comments

encoding/xml: edit comments

encoding/xml: add test to ensure '@' is legal in an attr val

encoding/xml: improve test error quoting for readability

encoding/xml: (*Decoder).nsname now strictly parses namespaces

encoding/xml: disable 3/4 tests for golang#43168

I’m not sure what the right fix is for this. Malformed namespaces
(leading or trailing colons, more than 1 colon) should result in an error.

encoding/xml: allow callers to specify namespace prefix

A preferred namespace prefix can now be specified by setting the local
name space to "prefix:space".

In a struct tag:

struct Message {
    XMLName struct{} `xml:"urn:ietf:foo foo:message"`
    Value string `xml:"urn:ietf:foo foo:value"`
}

encoding/xml: use tag prefixes if previously defined

Instead of having redundant xmlns= attrs.

encoding/xml: rename (*printer).popPrefix to popPrefixes

since it pops 1 or more prefixes

encoding/xml: rename printer struct fields

To reflect the fact that prefixes apply to tag names, not just attrs.

encoding/xml: url->uri; reorg comments

encoding/xml: fix comments

encoding/xml: elide redundant xmlns= attrs for default namespace (no prefix)

encoding/xml: move namespace prefix tests

encoding/xml: handle namespace prefixes at the root element

encoding/xml: handle namespaced prefixed attr names

encoding/xml: split out prefixes during reflection, not parsing

encoding/xml: rename tagName to xmlTag; document it

encoding/xml: separate printing xmlns:prefix= attr from creating prefix

encoding/xml: clean up comments

encoding/xml: don’t use xmlTag in attr serialization

encoding/xml: test nested prefixed namespaced tags

encoding/xml: add test for prefixed XML tags without xmlns

encoding/xml: update doc comments

encoding/xml: update comments

encoding/xml: preemptively declare and record all namespace prefixes

Immediate children of XML tags that share a namespace and prefix will now
have that namespace prefix declared on the parent tag.

Explicitly declared namespace prefixes via xmlns:prefix="uri" attributes
will now have their values recorded and reused for marshalling child tags.

This commit reorganizes how namespace prefixes are recorded and detected,
along with how start tags are recorded via a slice of element structs.

Some tests are changed, because the value of the marshalled XML has changed,
but the resulting XML should be equivalent (and correct).

encoding/xml: restore tests with xmlns:prefix= attrs to existing behavior

Use xmlnsURL instead of xmlnsPrefix to specify namespace prefixes.

encoding/xml: prefer unprefixed names where possible

encoding/xml: add EncodeToken tests for explicit prefixes

encoding/xml: add test cases for prefixed local names

encoding/xml: revert change in 8f143f5277; do not preemptively declare XML namespaces
ydnar added a commit to ydnar/go that referenced this issue May 1, 2023
All issues of golang#13400 which are not new functionalities have fixes.
There are minor incompatibilities between them due to the handling of
prefixes. Duplicating a prefix or an namespace is invalid XML.
This is now avoided. XML produced is always valid.

Tests have been added for each fix and example and previous tests
fixed as output is already more compact is some cases.

encoding/xml: fix duplication of namespace tags by encoder (golang#7535)

A tag prefix identifies the name space of the tag and not the default name
space like xmlns="...". Writing the prefix is incorrect when it is bound
to a name space using the standard xmlns:prefix="..." attribute.
This fix skips this print.

Consequences are
 - duplication is avoided in line with name space standard in reference.
 - the _xmlns declaration does not appear anymore. To keep the previous
behaviour, the prefix is printed in all other cases. Token now always
produces well-formed XML except when the explicit name space collides
with the prefix.

Made prefix handling "xmlns="space" xmlns:_xmlns="xmlns" _..." has
be removed in all wants of tests. In some cases, useless declarations like
xmlns:x="x" are still added in line with previous behavior.

encoding/xml: fix unexpected behavior of encoder.Indent("", "") (golang#13185, golang#11431)

MarshalIndent and Marshal share code. When prefix and indent are
empty, the behavior is like Marshal when it should have a minimal
indent, i.e. new line as in documentation.

A boolean is added to the local printer struct which defaults to false.
It is set to true only when MarshalIndent is used and prefix and indent
are empty.

encoding/xml: fix overriding by empty namespace (golang#7113)

The namespace defined by xmlns="value" can be overridden in
every included tag including by the empty namespace xmlns="".
Empty namespace is not authorized with a prefix (xmlns:ns="").

Method to calculate indent of XML handles depth of tag and
its associated namespace. The fix leaves the method active even
when no indent is required.

An XMLName field in a struct means that namespace must be
enforced even if empty. This occurs only on an inner tag as an
overwrite of any non-empty namespace of its outer tag.

To obtain the xmlns="" required, an attribute is added.

encoding/xml: fix panic on embedded unexported XMLName (golang#10538)

By laws of reflection, unexported fields are unreachable by .Value.
XMLName are allowed at any level of an inner struct but the struct
may not be reachable. If XMLName field is found without name,
it cannot be exported and the value is discarded like other fields.
Some comments have been to underline where the issue arises.
Another XMLName test was incorrectly set up and is fixed.
Various cases added in a specific test.

encoding/xml: fix panic of unmarshaling of anonymous structs (golang#16497)

Encoding/xml is using type "typinfo" which provides its own "value" method
using the reflection package. It fails to check for the documented possible
panics of the reflection methods. It is impossible to fix the method as the
parameter is also using reflection.

The fix is to discard anonymous structs which have no value anyway.
Encoder/xml documentation already mentions that fields are accessed using
the reflection package. A relevant test is added.

encoding/xml: fix closing tag failure (golang#20685)

Push/pop of elements name must be done using the eventual prefix together
with the tag name. The operation is moved before the translation of prefix
into its URI. One end element of a test is fixed as expecting the last used
namespace is incorrect.
After closing a tag using a namespace, the valid namespace must be taken
from the opening tag.

encoding/xml: add check of namespaces to detect field names conflicts (golang#8535, golang#11724)

Comparing namespaces of fields was missing and false conflicts were detected.

encoding/xml: fix invalid empty namespace without prefix (golang#8068)

Empty namespace is allowed only if it has no prefix. An error message is now
returned if a prefix exists. A similar case when no prefix is provided,
thus with syntax xmlns:="..." is also rejected.

encoding/xml: fix normalization of attributes values (golang#20614)

The attribute value was read as text. The existing attribute reader logic is
fixed as an attribute may have a namespace or only a prefix. Other
possibilities have been removed.

To keep the behavior of raw token which allows many faults in attributes list,
error handling is heavily using the Strict parameter of the decoder.
Specific tests have been added including list of attributes.

To keep the behavior or unmarshal, escaped characters handling has been
added but it is not symmetrical to Marshal for quotes but follows XML
specification.

encoding/xml: fix absence of detection of another : in qualified names (golang#20396)

The occurrence of second : in space and tag name is rejected.

Fixes: golang#7113, golang#7535, golang#8068, golang#8535, golang#10538, golang#11431, golang#13185, golang#16497, golang#20396, golang#20614, golang#20685

Change-Id: Ib4a60347a47d23ff59b63307cebb83b71c7c9165

Commit originally authored by: Constantin Konstantinidis <constantinkonstantinidis@gmail.com>

encoding/xml: fix printing of namespace prefix in tag names

Prefix displays in XML when defined in tag names.
The URL of the name space is also returned for an End Token as
documentation requires to improve idempotency of Marshal/Unmarshal.

Translating the prefix is popping the NS which was unavailable
for translation. Translate for an End Token has been moved inside
the pop element part.

Fixes golang#9519

Change-Id: Id7a14d07c106a76a487b5c4e28d9d563fe061c60

encoding/xml: restore changes lost in merge

See golang#43168.

encoding/xml: gofmt

encoding/xml: minimalIndent -> minIndent to shrink diff

encoding/xml: gofmt

encoding/xml: revert changes to (*Decoder).attrval from master

encoding/xml: restore (*printer).writeIndent to master

encoding/xml: remove comments that don’t change functionality of tests

encoding/xml: use t.Errorf instead of fmt.Errorf

encoding/xml: fix test case for golang#11496

encoding/xml: revert unrelated change in (*Decoder).readName

encoding/xml: remove comments

encoding/xml: remove comments

encoding/xml: edit comments

encoding/xml: add test to ensure '@' is legal in an attr val

encoding/xml: improve test error quoting for readability

encoding/xml: (*Decoder).nsname now strictly parses namespaces

encoding/xml: disable 3/4 tests for golang#43168

I’m not sure what the right fix is for this. Malformed namespaces
(leading or trailing colons, more than 1 colon) should result in an error.

encoding/xml: allow callers to specify namespace prefix

A preferred namespace prefix can now be specified by setting the local
name space to "prefix:space".

In a struct tag:

struct Message {
    XMLName struct{} `xml:"urn:ietf:foo foo:message"`
    Value string `xml:"urn:ietf:foo foo:value"`
}

encoding/xml: use tag prefixes if previously defined

Instead of having redundant xmlns= attrs.

encoding/xml: rename (*printer).popPrefix to popPrefixes

since it pops 1 or more prefixes

encoding/xml: rename printer struct fields

To reflect the fact that prefixes apply to tag names, not just attrs.

encoding/xml: url->uri; reorg comments

encoding/xml: fix comments

encoding/xml: elide redundant xmlns= attrs for default namespace (no prefix)

encoding/xml: move namespace prefix tests

encoding/xml: handle namespace prefixes at the root element

encoding/xml: handle namespaced prefixed attr names

encoding/xml: split out prefixes during reflection, not parsing

encoding/xml: rename tagName to xmlTag; document it

encoding/xml: separate printing xmlns:prefix= attr from creating prefix

encoding/xml: clean up comments

encoding/xml: don’t use xmlTag in attr serialization

encoding/xml: test nested prefixed namespaced tags

encoding/xml: add test for prefixed XML tags without xmlns

encoding/xml: update doc comments

encoding/xml: update comments

encoding/xml: preemptively declare and record all namespace prefixes

Immediate children of XML tags that share a namespace and prefix will now
have that namespace prefix declared on the parent tag.

Explicitly declared namespace prefixes via xmlns:prefix="uri" attributes
will now have their values recorded and reused for marshalling child tags.

This commit reorganizes how namespace prefixes are recorded and detected,
along with how start tags are recorded via a slice of element structs.

Some tests are changed, because the value of the marshalled XML has changed,
but the resulting XML should be equivalent (and correct).

encoding/xml: restore tests with xmlns:prefix= attrs to existing behavior

Use xmlnsURL instead of xmlnsPrefix to specify namespace prefixes.

encoding/xml: prefer unprefixed names where possible

encoding/xml: add EncodeToken tests for explicit prefixes

encoding/xml: add test cases for prefixed local names

encoding/xml: revert change in 8f143f5277; do not preemptively declare XML namespaces
ydnar added a commit to ydnar/go that referenced this issue May 1, 2023
All issues of golang#13400 which are not new functionalities have fixes.
There are minor incompatibilities between them due to the handling of
prefixes. Duplicating a prefix or an namespace is invalid XML.
This is now avoided. XML produced is always valid.

Tests have been added for each fix and example and previous tests
fixed as output is already more compact is some cases.

encoding/xml: fix duplication of namespace tags by encoder (golang#7535)

A tag prefix identifies the name space of the tag and not the default name
space like xmlns="...". Writing the prefix is incorrect when it is bound
to a name space using the standard xmlns:prefix="..." attribute.
This fix skips this print.

Consequences are
 - duplication is avoided in line with name space standard in reference.
 - the _xmlns declaration does not appear anymore. To keep the previous
behaviour, the prefix is printed in all other cases. Token now always
produces well-formed XML except when the explicit name space collides
with the prefix.

Made prefix handling "xmlns="space" xmlns:_xmlns="xmlns" _..." has
be removed in all wants of tests. In some cases, useless declarations like
xmlns:x="x" are still added in line with previous behavior.

encoding/xml: fix unexpected behavior of encoder.Indent("", "") (golang#13185, golang#11431)

MarshalIndent and Marshal share code. When prefix and indent are
empty, the behavior is like Marshal when it should have a minimal
indent, i.e. new line as in documentation.

A boolean is added to the local printer struct which defaults to false.
It is set to true only when MarshalIndent is used and prefix and indent
are empty.

encoding/xml: fix overriding by empty namespace (golang#7113)

The namespace defined by xmlns="value" can be overridden in
every included tag including by the empty namespace xmlns="".
Empty namespace is not authorized with a prefix (xmlns:ns="").

Method to calculate indent of XML handles depth of tag and
its associated namespace. The fix leaves the method active even
when no indent is required.

An XMLName field in a struct means that namespace must be
enforced even if empty. This occurs only on an inner tag as an
overwrite of any non-empty namespace of its outer tag.

To obtain the xmlns="" required, an attribute is added.

encoding/xml: fix panic on embedded unexported XMLName (golang#10538)

By laws of reflection, unexported fields are unreachable by .Value.
XMLName are allowed at any level of an inner struct but the struct
may not be reachable. If XMLName field is found without name,
it cannot be exported and the value is discarded like other fields.
Some comments have been to underline where the issue arises.
Another XMLName test was incorrectly set up and is fixed.
Various cases added in a specific test.

encoding/xml: fix panic of unmarshaling of anonymous structs (golang#16497)

Encoding/xml is using type "typinfo" which provides its own "value" method
using the reflection package. It fails to check for the documented possible
panics of the reflection methods. It is impossible to fix the method as the
parameter is also using reflection.

The fix is to discard anonymous structs which have no value anyway.
Encoder/xml documentation already mentions that fields are accessed using
the reflection package. A relevant test is added.

encoding/xml: fix closing tag failure (golang#20685)

Push/pop of elements name must be done using the eventual prefix together
with the tag name. The operation is moved before the translation of prefix
into its URI. One end element of a test is fixed as expecting the last used
namespace is incorrect.
After closing a tag using a namespace, the valid namespace must be taken
from the opening tag.

encoding/xml: add check of namespaces to detect field names conflicts (golang#8535, golang#11724)

Comparing namespaces of fields was missing and false conflicts were detected.

encoding/xml: fix invalid empty namespace without prefix (golang#8068)

Empty namespace is allowed only if it has no prefix. An error message is now
returned if a prefix exists. A similar case when no prefix is provided,
thus with syntax xmlns:="..." is also rejected.

encoding/xml: fix normalization of attributes values (golang#20614)

The attribute value was read as text. The existing attribute reader logic is
fixed as an attribute may have a namespace or only a prefix. Other
possibilities have been removed.

To keep the behavior of raw token which allows many faults in attributes list,
error handling is heavily using the Strict parameter of the decoder.
Specific tests have been added including list of attributes.

To keep the behavior or unmarshal, escaped characters handling has been
added but it is not symmetrical to Marshal for quotes but follows XML
specification.

encoding/xml: fix absence of detection of another : in qualified names (golang#20396)

The occurrence of second : in space and tag name is rejected.

Fixes: golang#7113, golang#7535, golang#8068, golang#8535, golang#10538, golang#11431, golang#13185, golang#16497, golang#20396, golang#20614, golang#20685

Change-Id: Ib4a60347a47d23ff59b63307cebb83b71c7c9165

Commit originally authored by: Constantin Konstantinidis <constantinkonstantinidis@gmail.com>

encoding/xml: fix printing of namespace prefix in tag names

Prefix displays in XML when defined in tag names.
The URL of the name space is also returned for an End Token as
documentation requires to improve idempotency of Marshal/Unmarshal.

Translating the prefix is popping the NS which was unavailable
for translation. Translate for an End Token has been moved inside
the pop element part.

Fixes golang#9519

Change-Id: Id7a14d07c106a76a487b5c4e28d9d563fe061c60

encoding/xml: restore changes lost in merge

See golang#43168.

encoding/xml: gofmt

encoding/xml: minimalIndent -> minIndent to shrink diff

encoding/xml: gofmt

encoding/xml: revert changes to (*Decoder).attrval from master

encoding/xml: restore (*printer).writeIndent to master

encoding/xml: remove comments that don’t change functionality of tests

encoding/xml: use t.Errorf instead of fmt.Errorf

encoding/xml: fix test case for golang#11496

encoding/xml: revert unrelated change in (*Decoder).readName

encoding/xml: remove comments

encoding/xml: remove comments

encoding/xml: edit comments

encoding/xml: add test to ensure '@' is legal in an attr val

encoding/xml: improve test error quoting for readability

encoding/xml: (*Decoder).nsname now strictly parses namespaces

encoding/xml: disable 3/4 tests for golang#43168

I’m not sure what the right fix is for this. Malformed namespaces
(leading or trailing colons, more than 1 colon) should result in an error.

encoding/xml: allow callers to specify namespace prefix

A preferred namespace prefix can now be specified by setting the local
name space to "prefix:space".

In a struct tag:

struct Message {
    XMLName struct{} `xml:"urn:ietf:foo foo:message"`
    Value string `xml:"urn:ietf:foo foo:value"`
}

encoding/xml: use tag prefixes if previously defined

Instead of having redundant xmlns= attrs.

encoding/xml: rename (*printer).popPrefix to popPrefixes

since it pops 1 or more prefixes

encoding/xml: rename printer struct fields

To reflect the fact that prefixes apply to tag names, not just attrs.

encoding/xml: url->uri; reorg comments

encoding/xml: fix comments

encoding/xml: elide redundant xmlns= attrs for default namespace (no prefix)

encoding/xml: move namespace prefix tests

encoding/xml: handle namespace prefixes at the root element

encoding/xml: handle namespaced prefixed attr names

encoding/xml: split out prefixes during reflection, not parsing

encoding/xml: rename tagName to xmlTag; document it

encoding/xml: separate printing xmlns:prefix= attr from creating prefix

encoding/xml: clean up comments

encoding/xml: don’t use xmlTag in attr serialization

encoding/xml: test nested prefixed namespaced tags

encoding/xml: add test for prefixed XML tags without xmlns

encoding/xml: update doc comments

encoding/xml: update comments

encoding/xml: preemptively declare and record all namespace prefixes

Immediate children of XML tags that share a namespace and prefix will now
have that namespace prefix declared on the parent tag.

Explicitly declared namespace prefixes via xmlns:prefix="uri" attributes
will now have their values recorded and reused for marshalling child tags.

This commit reorganizes how namespace prefixes are recorded and detected,
along with how start tags are recorded via a slice of element structs.

Some tests are changed, because the value of the marshalled XML has changed,
but the resulting XML should be equivalent (and correct).

encoding/xml: restore tests with xmlns:prefix= attrs to existing behavior

Use xmlnsURL instead of xmlnsPrefix to specify namespace prefixes.

encoding/xml: prefer unprefixed names where possible

encoding/xml: add EncodeToken tests for explicit prefixes

encoding/xml: add test cases for prefixed local names

encoding/xml: revert change in 8f143f5277; do not preemptively declare XML namespaces
ydnar added a commit to ydnar/go that referenced this issue May 1, 2023
All issues of golang#13400 which are not new functionalities have fixes.
There are minor incompatibilities between them due to the handling of
prefixes. Duplicating a prefix or an namespace is invalid XML.
This is now avoided. XML produced is always valid.

Tests have been added for each fix and example and previous tests
fixed as output is already more compact is some cases.

encoding/xml: fix duplication of namespace tags by encoder (golang#7535)

A tag prefix identifies the name space of the tag and not the default name
space like xmlns="...". Writing the prefix is incorrect when it is bound
to a name space using the standard xmlns:prefix="..." attribute.
This fix skips this print.

Consequences are
 - duplication is avoided in line with name space standard in reference.
 - the _xmlns declaration does not appear anymore. To keep the previous
behaviour, the prefix is printed in all other cases. Token now always
produces well-formed XML except when the explicit name space collides
with the prefix.

Made prefix handling "xmlns="space" xmlns:_xmlns="xmlns" _..." has
be removed in all wants of tests. In some cases, useless declarations like
xmlns:x="x" are still added in line with previous behavior.

encoding/xml: fix unexpected behavior of encoder.Indent("", "") (golang#13185, golang#11431)

MarshalIndent and Marshal share code. When prefix and indent are
empty, the behavior is like Marshal when it should have a minimal
indent, i.e. new line as in documentation.

A boolean is added to the local printer struct which defaults to false.
It is set to true only when MarshalIndent is used and prefix and indent
are empty.

encoding/xml: fix overriding by empty namespace (golang#7113)

The namespace defined by xmlns="value" can be overridden in
every included tag including by the empty namespace xmlns="".
Empty namespace is not authorized with a prefix (xmlns:ns="").

Method to calculate indent of XML handles depth of tag and
its associated namespace. The fix leaves the method active even
when no indent is required.

An XMLName field in a struct means that namespace must be
enforced even if empty. This occurs only on an inner tag as an
overwrite of any non-empty namespace of its outer tag.

To obtain the xmlns="" required, an attribute is added.

encoding/xml: fix panic on embedded unexported XMLName (golang#10538)

By laws of reflection, unexported fields are unreachable by .Value.
XMLName are allowed at any level of an inner struct but the struct
may not be reachable. If XMLName field is found without name,
it cannot be exported and the value is discarded like other fields.
Some comments have been to underline where the issue arises.
Another XMLName test was incorrectly set up and is fixed.
Various cases added in a specific test.

encoding/xml: fix panic of unmarshaling of anonymous structs (golang#16497)

Encoding/xml is using type "typinfo" which provides its own "value" method
using the reflection package. It fails to check for the documented possible
panics of the reflection methods. It is impossible to fix the method as the
parameter is also using reflection.

The fix is to discard anonymous structs which have no value anyway.
Encoder/xml documentation already mentions that fields are accessed using
the reflection package. A relevant test is added.

encoding/xml: fix closing tag failure (golang#20685)

Push/pop of elements name must be done using the eventual prefix together
with the tag name. The operation is moved before the translation of prefix
into its URI. One end element of a test is fixed as expecting the last used
namespace is incorrect.
After closing a tag using a namespace, the valid namespace must be taken
from the opening tag.

encoding/xml: add check of namespaces to detect field names conflicts (golang#8535, golang#11724)

Comparing namespaces of fields was missing and false conflicts were detected.

encoding/xml: fix invalid empty namespace without prefix (golang#8068)

Empty namespace is allowed only if it has no prefix. An error message is now
returned if a prefix exists. A similar case when no prefix is provided,
thus with syntax xmlns:="..." is also rejected.

encoding/xml: fix normalization of attributes values (golang#20614)

The attribute value was read as text. The existing attribute reader logic is
fixed as an attribute may have a namespace or only a prefix. Other
possibilities have been removed.

To keep the behavior of raw token which allows many faults in attributes list,
error handling is heavily using the Strict parameter of the decoder.
Specific tests have been added including list of attributes.

To keep the behavior or unmarshal, escaped characters handling has been
added but it is not symmetrical to Marshal for quotes but follows XML
specification.

encoding/xml: fix absence of detection of another : in qualified names (golang#20396)

The occurrence of second : in space and tag name is rejected.

Fixes: golang#7113, golang#7535, golang#8068, golang#8535, golang#10538, golang#11431, golang#13185, golang#16497, golang#20396, golang#20614, golang#20685

Change-Id: Ib4a60347a47d23ff59b63307cebb83b71c7c9165

Commit originally authored by: Constantin Konstantinidis <constantinkonstantinidis@gmail.com>

encoding/xml: fix printing of namespace prefix in tag names

Prefix displays in XML when defined in tag names.
The URL of the name space is also returned for an End Token as
documentation requires to improve idempotency of Marshal/Unmarshal.

Translating the prefix is popping the NS which was unavailable
for translation. Translate for an End Token has been moved inside
the pop element part.

Fixes golang#9519

Change-Id: Id7a14d07c106a76a487b5c4e28d9d563fe061c60

encoding/xml: restore changes lost in merge

See golang#43168.

encoding/xml: gofmt

encoding/xml: minimalIndent -> minIndent to shrink diff

encoding/xml: gofmt

encoding/xml: revert changes to (*Decoder).attrval from master

encoding/xml: restore (*printer).writeIndent to master

encoding/xml: remove comments that don’t change functionality of tests

encoding/xml: use t.Errorf instead of fmt.Errorf

encoding/xml: fix test case for golang#11496

encoding/xml: revert unrelated change in (*Decoder).readName

encoding/xml: remove comments

encoding/xml: remove comments

encoding/xml: edit comments

encoding/xml: add test to ensure '@' is legal in an attr val

encoding/xml: improve test error quoting for readability

encoding/xml: (*Decoder).nsname now strictly parses namespaces

encoding/xml: disable 3/4 tests for golang#43168

I’m not sure what the right fix is for this. Malformed namespaces
(leading or trailing colons, more than 1 colon) should result in an error.

encoding/xml: allow callers to specify namespace prefix

A preferred namespace prefix can now be specified by setting the local
name space to "prefix:space".

In a struct tag:

struct Message {
    XMLName struct{} `xml:"urn:ietf:foo foo:message"`
    Value string `xml:"urn:ietf:foo foo:value"`
}

encoding/xml: use tag prefixes if previously defined

Instead of having redundant xmlns= attrs.

encoding/xml: rename (*printer).popPrefix to popPrefixes

since it pops 1 or more prefixes

encoding/xml: rename printer struct fields

To reflect the fact that prefixes apply to tag names, not just attrs.

encoding/xml: url->uri; reorg comments

encoding/xml: fix comments

encoding/xml: elide redundant xmlns= attrs for default namespace (no prefix)

encoding/xml: move namespace prefix tests

encoding/xml: handle namespace prefixes at the root element

encoding/xml: handle namespaced prefixed attr names

encoding/xml: split out prefixes during reflection, not parsing

encoding/xml: rename tagName to xmlTag; document it

encoding/xml: separate printing xmlns:prefix= attr from creating prefix

encoding/xml: clean up comments

encoding/xml: don’t use xmlTag in attr serialization

encoding/xml: test nested prefixed namespaced tags

encoding/xml: add test for prefixed XML tags without xmlns

encoding/xml: update doc comments

encoding/xml: update comments

encoding/xml: preemptively declare and record all namespace prefixes

Immediate children of XML tags that share a namespace and prefix will now
have that namespace prefix declared on the parent tag.

Explicitly declared namespace prefixes via xmlns:prefix="uri" attributes
will now have their values recorded and reused for marshalling child tags.

This commit reorganizes how namespace prefixes are recorded and detected,
along with how start tags are recorded via a slice of element structs.

Some tests are changed, because the value of the marshalled XML has changed,
but the resulting XML should be equivalent (and correct).

encoding/xml: restore tests with xmlns:prefix= attrs to existing behavior

Use xmlnsURL instead of xmlnsPrefix to specify namespace prefixes.

encoding/xml: prefer unprefixed names where possible

encoding/xml: add EncodeToken tests for explicit prefixes

encoding/xml: add test cases for prefixed local names

encoding/xml: revert change in 8f143f5277; do not preemptively declare XML namespaces
ydnar added a commit to ydnar/go that referenced this issue May 1, 2023
All issues of golang#13400 which are not new functionalities have fixes.
There are minor incompatibilities between them due to the handling of
prefixes. Duplicating a prefix or an namespace is invalid XML.
This is now avoided. XML produced is always valid.

Tests have been added for each fix and example and previous tests
fixed as output is already more compact is some cases.

encoding/xml: fix duplication of namespace tags by encoder (golang#7535)

A tag prefix identifies the name space of the tag and not the default name
space like xmlns="...". Writing the prefix is incorrect when it is bound
to a name space using the standard xmlns:prefix="..." attribute.
This fix skips this print.

Consequences are
 - duplication is avoided in line with name space standard in reference.
 - the _xmlns declaration does not appear anymore. To keep the previous
behaviour, the prefix is printed in all other cases. Token now always
produces well-formed XML except when the explicit name space collides
with the prefix.

Made prefix handling "xmlns="space" xmlns:_xmlns="xmlns" _..." has
be removed in all wants of tests. In some cases, useless declarations like
xmlns:x="x" are still added in line with previous behavior.

encoding/xml: fix unexpected behavior of encoder.Indent("", "") (golang#13185, golang#11431)

MarshalIndent and Marshal share code. When prefix and indent are
empty, the behavior is like Marshal when it should have a minimal
indent, i.e. new line as in documentation.

A boolean is added to the local printer struct which defaults to false.
It is set to true only when MarshalIndent is used and prefix and indent
are empty.

encoding/xml: fix overriding by empty namespace (golang#7113)

The namespace defined by xmlns="value" can be overridden in
every included tag including by the empty namespace xmlns="".
Empty namespace is not authorized with a prefix (xmlns:ns="").

Method to calculate indent of XML handles depth of tag and
its associated namespace. The fix leaves the method active even
when no indent is required.

An XMLName field in a struct means that namespace must be
enforced even if empty. This occurs only on an inner tag as an
overwrite of any non-empty namespace of its outer tag.

To obtain the xmlns="" required, an attribute is added.

encoding/xml: fix panic on embedded unexported XMLName (golang#10538)

By laws of reflection, unexported fields are unreachable by .Value.
XMLName are allowed at any level of an inner struct but the struct
may not be reachable. If XMLName field is found without name,
it cannot be exported and the value is discarded like other fields.
Some comments have been to underline where the issue arises.
Another XMLName test was incorrectly set up and is fixed.
Various cases added in a specific test.

encoding/xml: fix panic of unmarshaling of anonymous structs (golang#16497)

Encoding/xml is using type "typinfo" which provides its own "value" method
using the reflection package. It fails to check for the documented possible
panics of the reflection methods. It is impossible to fix the method as the
parameter is also using reflection.

The fix is to discard anonymous structs which have no value anyway.
Encoder/xml documentation already mentions that fields are accessed using
the reflection package. A relevant test is added.

encoding/xml: fix closing tag failure (golang#20685)

Push/pop of elements name must be done using the eventual prefix together
with the tag name. The operation is moved before the translation of prefix
into its URI. One end element of a test is fixed as expecting the last used
namespace is incorrect.
After closing a tag using a namespace, the valid namespace must be taken
from the opening tag.

encoding/xml: add check of namespaces to detect field names conflicts (golang#8535, golang#11724)

Comparing namespaces of fields was missing and false conflicts were detected.

encoding/xml: fix invalid empty namespace without prefix (golang#8068)

Empty namespace is allowed only if it has no prefix. An error message is now
returned if a prefix exists. A similar case when no prefix is provided,
thus with syntax xmlns:="..." is also rejected.

encoding/xml: fix normalization of attributes values (golang#20614)

The attribute value was read as text. The existing attribute reader logic is
fixed as an attribute may have a namespace or only a prefix. Other
possibilities have been removed.

To keep the behavior of raw token which allows many faults in attributes list,
error handling is heavily using the Strict parameter of the decoder.
Specific tests have been added including list of attributes.

To keep the behavior or unmarshal, escaped characters handling has been
added but it is not symmetrical to Marshal for quotes but follows XML
specification.

encoding/xml: fix absence of detection of another : in qualified names (golang#20396)

The occurrence of second : in space and tag name is rejected.

Fixes: golang#7113, golang#7535, golang#8068, golang#8535, golang#10538, golang#11431, golang#13185, golang#16497, golang#20396, golang#20614, golang#20685

Change-Id: Ib4a60347a47d23ff59b63307cebb83b71c7c9165

Commit originally authored by: Constantin Konstantinidis <constantinkonstantinidis@gmail.com>

encoding/xml: fix printing of namespace prefix in tag names

Prefix displays in XML when defined in tag names.
The URL of the name space is also returned for an End Token as
documentation requires to improve idempotency of Marshal/Unmarshal.

Translating the prefix is popping the NS which was unavailable
for translation. Translate for an End Token has been moved inside
the pop element part.

Fixes golang#9519

Change-Id: Id7a14d07c106a76a487b5c4e28d9d563fe061c60

encoding/xml: restore changes lost in merge

See golang#43168.

encoding/xml: gofmt

encoding/xml: minimalIndent -> minIndent to shrink diff

encoding/xml: gofmt

encoding/xml: revert changes to (*Decoder).attrval from master

encoding/xml: restore (*printer).writeIndent to master

encoding/xml: remove comments that don’t change functionality of tests

encoding/xml: use t.Errorf instead of fmt.Errorf

encoding/xml: fix test case for golang#11496

encoding/xml: revert unrelated change in (*Decoder).readName

encoding/xml: remove comments

encoding/xml: remove comments

encoding/xml: edit comments

encoding/xml: add test to ensure '@' is legal in an attr val

encoding/xml: improve test error quoting for readability

encoding/xml: (*Decoder).nsname now strictly parses namespaces

encoding/xml: disable 3/4 tests for golang#43168

I’m not sure what the right fix is for this. Malformed namespaces
(leading or trailing colons, more than 1 colon) should result in an error.

encoding/xml: allow callers to specify namespace prefix

A preferred namespace prefix can now be specified by setting the local
name space to "prefix:space".

In a struct tag:

struct Message {
    XMLName struct{} `xml:"urn:ietf:foo foo:message"`
    Value string `xml:"urn:ietf:foo foo:value"`
}

encoding/xml: use tag prefixes if previously defined

Instead of having redundant xmlns= attrs.

encoding/xml: rename (*printer).popPrefix to popPrefixes

since it pops 1 or more prefixes

encoding/xml: rename printer struct fields

To reflect the fact that prefixes apply to tag names, not just attrs.

encoding/xml: url->uri; reorg comments

encoding/xml: fix comments

encoding/xml: elide redundant xmlns= attrs for default namespace (no prefix)

encoding/xml: move namespace prefix tests

encoding/xml: handle namespace prefixes at the root element

encoding/xml: handle namespaced prefixed attr names

encoding/xml: split out prefixes during reflection, not parsing

encoding/xml: rename tagName to xmlTag; document it

encoding/xml: separate printing xmlns:prefix= attr from creating prefix

encoding/xml: clean up comments

encoding/xml: don’t use xmlTag in attr serialization

encoding/xml: test nested prefixed namespaced tags

encoding/xml: add test for prefixed XML tags without xmlns

encoding/xml: update doc comments

encoding/xml: update comments

encoding/xml: preemptively declare and record all namespace prefixes

Immediate children of XML tags that share a namespace and prefix will now
have that namespace prefix declared on the parent tag.

Explicitly declared namespace prefixes via xmlns:prefix="uri" attributes
will now have their values recorded and reused for marshalling child tags.

This commit reorganizes how namespace prefixes are recorded and detected,
along with how start tags are recorded via a slice of element structs.

Some tests are changed, because the value of the marshalled XML has changed,
but the resulting XML should be equivalent (and correct).

encoding/xml: restore tests with xmlns:prefix= attrs to existing behavior

Use xmlnsURL instead of xmlnsPrefix to specify namespace prefixes.

encoding/xml: prefer unprefixed names where possible

encoding/xml: add EncodeToken tests for explicit prefixes

encoding/xml: add test cases for prefixed local names

encoding/xml: revert change in 8f143f5277; do not preemptively declare XML namespaces
ydnar added a commit to ydnar/go that referenced this issue May 1, 2023
All issues of golang#13400 which are not new functionalities have fixes.
There are minor incompatibilities between them due to the handling of
prefixes. Duplicating a prefix or an namespace is invalid XML.
This is now avoided. XML produced is always valid.

Tests have been added for each fix and example and previous tests
fixed as output is already more compact is some cases.

encoding/xml: fix duplication of namespace tags by encoder (golang#7535)

A tag prefix identifies the name space of the tag and not the default name
space like xmlns="...". Writing the prefix is incorrect when it is bound
to a name space using the standard xmlns:prefix="..." attribute.
This fix skips this print.

Consequences are
 - duplication is avoided in line with name space standard in reference.
 - the _xmlns declaration does not appear anymore. To keep the previous
behaviour, the prefix is printed in all other cases. Token now always
produces well-formed XML except when the explicit name space collides
with the prefix.

Made prefix handling "xmlns="space" xmlns:_xmlns="xmlns" _..." has
be removed in all wants of tests. In some cases, useless declarations like
xmlns:x="x" are still added in line with previous behavior.

encoding/xml: fix unexpected behavior of encoder.Indent("", "") (golang#13185, golang#11431)

MarshalIndent and Marshal share code. When prefix and indent are
empty, the behavior is like Marshal when it should have a minimal
indent, i.e. new line as in documentation.

A boolean is added to the local printer struct which defaults to false.
It is set to true only when MarshalIndent is used and prefix and indent
are empty.

encoding/xml: fix overriding by empty namespace (golang#7113)

The namespace defined by xmlns="value" can be overridden in
every included tag including by the empty namespace xmlns="".
Empty namespace is not authorized with a prefix (xmlns:ns="").

Method to calculate indent of XML handles depth of tag and
its associated namespace. The fix leaves the method active even
when no indent is required.

An XMLName field in a struct means that namespace must be
enforced even if empty. This occurs only on an inner tag as an
overwrite of any non-empty namespace of its outer tag.

To obtain the xmlns="" required, an attribute is added.

encoding/xml: fix panic on embedded unexported XMLName (golang#10538)

By laws of reflection, unexported fields are unreachable by .Value.
XMLName are allowed at any level of an inner struct but the struct
may not be reachable. If XMLName field is found without name,
it cannot be exported and the value is discarded like other fields.
Some comments have been to underline where the issue arises.
Another XMLName test was incorrectly set up and is fixed.
Various cases added in a specific test.

encoding/xml: fix panic of unmarshaling of anonymous structs (golang#16497)

Encoding/xml is using type "typinfo" which provides its own "value" method
using the reflection package. It fails to check for the documented possible
panics of the reflection methods. It is impossible to fix the method as the
parameter is also using reflection.

The fix is to discard anonymous structs which have no value anyway.
Encoder/xml documentation already mentions that fields are accessed using
the reflection package. A relevant test is added.

encoding/xml: fix closing tag failure (golang#20685)

Push/pop of elements name must be done using the eventual prefix together
with the tag name. The operation is moved before the translation of prefix
into its URI. One end element of a test is fixed as expecting the last used
namespace is incorrect.
After closing a tag using a namespace, the valid namespace must be taken
from the opening tag.

encoding/xml: add check of namespaces to detect field names conflicts (golang#8535, golang#11724)

Comparing namespaces of fields was missing and false conflicts were detected.

encoding/xml: fix invalid empty namespace without prefix (golang#8068)

Empty namespace is allowed only if it has no prefix. An error message is now
returned if a prefix exists. A similar case when no prefix is provided,
thus with syntax xmlns:="..." is also rejected.

encoding/xml: fix normalization of attributes values (golang#20614)

The attribute value was read as text. The existing attribute reader logic is
fixed as an attribute may have a namespace or only a prefix. Other
possibilities have been removed.

To keep the behavior of raw token which allows many faults in attributes list,
error handling is heavily using the Strict parameter of the decoder.
Specific tests have been added including list of attributes.

To keep the behavior or unmarshal, escaped characters handling has been
added but it is not symmetrical to Marshal for quotes but follows XML
specification.

encoding/xml: fix absence of detection of another : in qualified names (golang#20396)

The occurrence of second : in space and tag name is rejected.

Fixes: golang#7113, golang#7535, golang#8068, golang#8535, golang#10538, golang#11431, golang#13185, golang#16497, golang#20396, golang#20614, golang#20685

Change-Id: Ib4a60347a47d23ff59b63307cebb83b71c7c9165

Commit originally authored by: Constantin Konstantinidis <constantinkonstantinidis@gmail.com>

encoding/xml: fix printing of namespace prefix in tag names

Prefix displays in XML when defined in tag names.
The URL of the name space is also returned for an End Token as
documentation requires to improve idempotency of Marshal/Unmarshal.

Translating the prefix is popping the NS which was unavailable
for translation. Translate for an End Token has been moved inside
the pop element part.

Fixes golang#9519

Change-Id: Id7a14d07c106a76a487b5c4e28d9d563fe061c60

encoding/xml: restore changes lost in merge

See golang#43168.

encoding/xml: gofmt

encoding/xml: minimalIndent -> minIndent to shrink diff

encoding/xml: gofmt

encoding/xml: revert changes to (*Decoder).attrval from master

encoding/xml: restore (*printer).writeIndent to master

encoding/xml: remove comments that don’t change functionality of tests

encoding/xml: use t.Errorf instead of fmt.Errorf

encoding/xml: fix test case for golang#11496

encoding/xml: revert unrelated change in (*Decoder).readName

encoding/xml: remove comments

encoding/xml: remove comments

encoding/xml: edit comments

encoding/xml: add test to ensure '@' is legal in an attr val

encoding/xml: improve test error quoting for readability

encoding/xml: (*Decoder).nsname now strictly parses namespaces

encoding/xml: disable 3/4 tests for golang#43168

I’m not sure what the right fix is for this. Malformed namespaces
(leading or trailing colons, more than 1 colon) should result in an error.

encoding/xml: allow callers to specify namespace prefix

A preferred namespace prefix can now be specified by setting the local
name space to "prefix:space".

In a struct tag:

struct Message {
    XMLName struct{} `xml:"urn:ietf:foo foo:message"`
    Value string `xml:"urn:ietf:foo foo:value"`
}

encoding/xml: use tag prefixes if previously defined

Instead of having redundant xmlns= attrs.

encoding/xml: rename (*printer).popPrefix to popPrefixes

since it pops 1 or more prefixes

encoding/xml: rename printer struct fields

To reflect the fact that prefixes apply to tag names, not just attrs.

encoding/xml: url->uri; reorg comments

encoding/xml: fix comments

encoding/xml: elide redundant xmlns= attrs for default namespace (no prefix)

encoding/xml: move namespace prefix tests

encoding/xml: handle namespace prefixes at the root element

encoding/xml: handle namespaced prefixed attr names

encoding/xml: split out prefixes during reflection, not parsing

encoding/xml: rename tagName to xmlTag; document it

encoding/xml: separate printing xmlns:prefix= attr from creating prefix

encoding/xml: clean up comments

encoding/xml: don’t use xmlTag in attr serialization

encoding/xml: test nested prefixed namespaced tags

encoding/xml: add test for prefixed XML tags without xmlns

encoding/xml: update doc comments

encoding/xml: update comments

encoding/xml: preemptively declare and record all namespace prefixes

Immediate children of XML tags that share a namespace and prefix will now
have that namespace prefix declared on the parent tag.

Explicitly declared namespace prefixes via xmlns:prefix="uri" attributes
will now have their values recorded and reused for marshalling child tags.

This commit reorganizes how namespace prefixes are recorded and detected,
along with how start tags are recorded via a slice of element structs.

Some tests are changed, because the value of the marshalled XML has changed,
but the resulting XML should be equivalent (and correct).

encoding/xml: restore tests with xmlns:prefix= attrs to existing behavior

Use xmlnsURL instead of xmlnsPrefix to specify namespace prefixes.

encoding/xml: prefer unprefixed names where possible

encoding/xml: add EncodeToken tests for explicit prefixes

encoding/xml: add test cases for prefixed local names

encoding/xml: revert change in 8f143f5277; do not preemptively declare XML namespaces
ydnar added a commit to ydnar/go that referenced this issue May 1, 2023
All issues of golang#13400 which are not new functionalities have fixes.
There are minor incompatibilities between them due to the handling of
prefixes. Duplicating a prefix or an namespace is invalid XML.
This is now avoided. XML produced is always valid.

Tests have been added for each fix and example and previous tests
fixed as output is already more compact is some cases.

encoding/xml: fix duplication of namespace tags by encoder (golang#7535)

A tag prefix identifies the name space of the tag and not the default name
space like xmlns="...". Writing the prefix is incorrect when it is bound
to a name space using the standard xmlns:prefix="..." attribute.
This fix skips this print.

Consequences are
 - duplication is avoided in line with name space standard in reference.
 - the _xmlns declaration does not appear anymore. To keep the previous
behaviour, the prefix is printed in all other cases. Token now always
produces well-formed XML except when the explicit name space collides
with the prefix.

Made prefix handling "xmlns="space" xmlns:_xmlns="xmlns" _..." has
be removed in all wants of tests. In some cases, useless declarations like
xmlns:x="x" are still added in line with previous behavior.

encoding/xml: fix unexpected behavior of encoder.Indent("", "") (golang#13185, golang#11431)

MarshalIndent and Marshal share code. When prefix and indent are
empty, the behavior is like Marshal when it should have a minimal
indent, i.e. new line as in documentation.

A boolean is added to the local printer struct which defaults to false.
It is set to true only when MarshalIndent is used and prefix and indent
are empty.

encoding/xml: fix overriding by empty namespace (golang#7113)

The namespace defined by xmlns="value" can be overridden in
every included tag including by the empty namespace xmlns="".
Empty namespace is not authorized with a prefix (xmlns:ns="").

Method to calculate indent of XML handles depth of tag and
its associated namespace. The fix leaves the method active even
when no indent is required.

An XMLName field in a struct means that namespace must be
enforced even if empty. This occurs only on an inner tag as an
overwrite of any non-empty namespace of its outer tag.

To obtain the xmlns="" required, an attribute is added.

encoding/xml: fix panic on embedded unexported XMLName (golang#10538)

By laws of reflection, unexported fields are unreachable by .Value.
XMLName are allowed at any level of an inner struct but the struct
may not be reachable. If XMLName field is found without name,
it cannot be exported and the value is discarded like other fields.
Some comments have been to underline where the issue arises.
Another XMLName test was incorrectly set up and is fixed.
Various cases added in a specific test.

encoding/xml: fix panic of unmarshaling of anonymous structs (golang#16497)

Encoding/xml is using type "typinfo" which provides its own "value" method
using the reflection package. It fails to check for the documented possible
panics of the reflection methods. It is impossible to fix the method as the
parameter is also using reflection.

The fix is to discard anonymous structs which have no value anyway.
Encoder/xml documentation already mentions that fields are accessed using
the reflection package. A relevant test is added.

encoding/xml: fix closing tag failure (golang#20685)

Push/pop of elements name must be done using the eventual prefix together
with the tag name. The operation is moved before the translation of prefix
into its URI. One end element of a test is fixed as expecting the last used
namespace is incorrect.
After closing a tag using a namespace, the valid namespace must be taken
from the opening tag.

encoding/xml: add check of namespaces to detect field names conflicts (golang#8535, golang#11724)

Comparing namespaces of fields was missing and false conflicts were detected.

encoding/xml: fix invalid empty namespace without prefix (golang#8068)

Empty namespace is allowed only if it has no prefix. An error message is now
returned if a prefix exists. A similar case when no prefix is provided,
thus with syntax xmlns:="..." is also rejected.

encoding/xml: fix normalization of attributes values (golang#20614)

The attribute value was read as text. The existing attribute reader logic is
fixed as an attribute may have a namespace or only a prefix. Other
possibilities have been removed.

To keep the behavior of raw token which allows many faults in attributes list,
error handling is heavily using the Strict parameter of the decoder.
Specific tests have been added including list of attributes.

To keep the behavior or unmarshal, escaped characters handling has been
added but it is not symmetrical to Marshal for quotes but follows XML
specification.

encoding/xml: fix absence of detection of another : in qualified names (golang#20396)

The occurrence of second : in space and tag name is rejected.

Fixes: golang#7113, golang#7535, golang#8068, golang#8535, golang#10538, golang#11431, golang#13185, golang#16497, golang#20396, golang#20614, golang#20685

Change-Id: Ib4a60347a47d23ff59b63307cebb83b71c7c9165

Commit originally authored by: Constantin Konstantinidis <constantinkonstantinidis@gmail.com>

encoding/xml: fix printing of namespace prefix in tag names

Prefix displays in XML when defined in tag names.
The URL of the name space is also returned for an End Token as
documentation requires to improve idempotency of Marshal/Unmarshal.

Translating the prefix is popping the NS which was unavailable
for translation. Translate for an End Token has been moved inside
the pop element part.

Fixes golang#9519

Change-Id: Id7a14d07c106a76a487b5c4e28d9d563fe061c60

encoding/xml: restore changes lost in merge

See golang#43168.

encoding/xml: gofmt

encoding/xml: minimalIndent -> minIndent to shrink diff

encoding/xml: gofmt

encoding/xml: revert changes to (*Decoder).attrval from master

encoding/xml: restore (*printer).writeIndent to master

encoding/xml: remove comments that don’t change functionality of tests

encoding/xml: use t.Errorf instead of fmt.Errorf

encoding/xml: fix test case for golang#11496

encoding/xml: revert unrelated change in (*Decoder).readName

encoding/xml: remove comments

encoding/xml: remove comments

encoding/xml: edit comments

encoding/xml: add test to ensure '@' is legal in an attr val

encoding/xml: improve test error quoting for readability

encoding/xml: (*Decoder).nsname now strictly parses namespaces

encoding/xml: disable 3/4 tests for golang#43168

I’m not sure what the right fix is for this. Malformed namespaces
(leading or trailing colons, more than 1 colon) should result in an error.

encoding/xml: allow callers to specify namespace prefix

A preferred namespace prefix can now be specified by setting the local
name space to "prefix:space".

In a struct tag:

struct Message {
    XMLName struct{} `xml:"urn:ietf:foo foo:message"`
    Value string `xml:"urn:ietf:foo foo:value"`
}

encoding/xml: use tag prefixes if previously defined

Instead of having redundant xmlns= attrs.

encoding/xml: rename (*printer).popPrefix to popPrefixes

since it pops 1 or more prefixes

encoding/xml: rename printer struct fields

To reflect the fact that prefixes apply to tag names, not just attrs.

encoding/xml: url->uri; reorg comments

encoding/xml: fix comments

encoding/xml: elide redundant xmlns= attrs for default namespace (no prefix)

encoding/xml: move namespace prefix tests

encoding/xml: handle namespace prefixes at the root element

encoding/xml: handle namespaced prefixed attr names

encoding/xml: split out prefixes during reflection, not parsing

encoding/xml: rename tagName to xmlTag; document it

encoding/xml: separate printing xmlns:prefix= attr from creating prefix

encoding/xml: clean up comments

encoding/xml: don’t use xmlTag in attr serialization

encoding/xml: test nested prefixed namespaced tags

encoding/xml: add test for prefixed XML tags without xmlns

encoding/xml: update doc comments

encoding/xml: update comments

encoding/xml: preemptively declare and record all namespace prefixes

Immediate children of XML tags that share a namespace and prefix will now
have that namespace prefix declared on the parent tag.

Explicitly declared namespace prefixes via xmlns:prefix="uri" attributes
will now have their values recorded and reused for marshalling child tags.

This commit reorganizes how namespace prefixes are recorded and detected,
along with how start tags are recorded via a slice of element structs.

Some tests are changed, because the value of the marshalled XML has changed,
but the resulting XML should be equivalent (and correct).

encoding/xml: restore tests with xmlns:prefix= attrs to existing behavior

Use xmlnsURL instead of xmlnsPrefix to specify namespace prefixes.

encoding/xml: prefer unprefixed names where possible

encoding/xml: add EncodeToken tests for explicit prefixes

encoding/xml: add test cases for prefixed local names

encoding/xml: revert change in 8f143f5277; do not preemptively declare XML namespaces
ydnar added a commit to ydnar/go that referenced this issue May 1, 2023
All issues of golang#13400 which are not new functionalities have fixes.
There are minor incompatibilities between them due to the handling of
prefixes. Duplicating a prefix or an namespace is invalid XML.
This is now avoided. XML produced is always valid.

Tests have been added for each fix and example and previous tests
fixed as output is already more compact is some cases.

encoding/xml: fix duplication of namespace tags by encoder (golang#7535)

A tag prefix identifies the name space of the tag and not the default name
space like xmlns="...". Writing the prefix is incorrect when it is bound
to a name space using the standard xmlns:prefix="..." attribute.
This fix skips this print.

Consequences are
 - duplication is avoided in line with name space standard in reference.
 - the _xmlns declaration does not appear anymore. To keep the previous
behaviour, the prefix is printed in all other cases. Token now always
produces well-formed XML except when the explicit name space collides
with the prefix.

Made prefix handling "xmlns="space" xmlns:_xmlns="xmlns" _..." has
be removed in all wants of tests. In some cases, useless declarations like
xmlns:x="x" are still added in line with previous behavior.

encoding/xml: fix unexpected behavior of encoder.Indent("", "") (golang#13185, golang#11431)

MarshalIndent and Marshal share code. When prefix and indent are
empty, the behavior is like Marshal when it should have a minimal
indent, i.e. new line as in documentation.

A boolean is added to the local printer struct which defaults to false.
It is set to true only when MarshalIndent is used and prefix and indent
are empty.

encoding/xml: fix overriding by empty namespace (golang#7113)

The namespace defined by xmlns="value" can be overridden in
every included tag including by the empty namespace xmlns="".
Empty namespace is not authorized with a prefix (xmlns:ns="").

Method to calculate indent of XML handles depth of tag and
its associated namespace. The fix leaves the method active even
when no indent is required.

An XMLName field in a struct means that namespace must be
enforced even if empty. This occurs only on an inner tag as an
overwrite of any non-empty namespace of its outer tag.

To obtain the xmlns="" required, an attribute is added.

encoding/xml: fix panic on embedded unexported XMLName (golang#10538)

By laws of reflection, unexported fields are unreachable by .Value.
XMLName are allowed at any level of an inner struct but the struct
may not be reachable. If XMLName field is found without name,
it cannot be exported and the value is discarded like other fields.
Some comments have been to underline where the issue arises.
Another XMLName test was incorrectly set up and is fixed.
Various cases added in a specific test.

encoding/xml: fix panic of unmarshaling of anonymous structs (golang#16497)

Encoding/xml is using type "typinfo" which provides its own "value" method
using the reflection package. It fails to check for the documented possible
panics of the reflection methods. It is impossible to fix the method as the
parameter is also using reflection.

The fix is to discard anonymous structs which have no value anyway.
Encoder/xml documentation already mentions that fields are accessed using
the reflection package. A relevant test is added.

encoding/xml: fix closing tag failure (golang#20685)

Push/pop of elements name must be done using the eventual prefix together
with the tag name. The operation is moved before the translation of prefix
into its URI. One end element of a test is fixed as expecting the last used
namespace is incorrect.
After closing a tag using a namespace, the valid namespace must be taken
from the opening tag.

encoding/xml: add check of namespaces to detect field names conflicts (golang#8535, golang#11724)

Comparing namespaces of fields was missing and false conflicts were detected.

encoding/xml: fix invalid empty namespace without prefix (golang#8068)

Empty namespace is allowed only if it has no prefix. An error message is now
returned if a prefix exists. A similar case when no prefix is provided,
thus with syntax xmlns:="..." is also rejected.

encoding/xml: fix normalization of attributes values (golang#20614)

The attribute value was read as text. The existing attribute reader logic is
fixed as an attribute may have a namespace or only a prefix. Other
possibilities have been removed.

To keep the behavior of raw token which allows many faults in attributes list,
error handling is heavily using the Strict parameter of the decoder.
Specific tests have been added including list of attributes.

To keep the behavior or unmarshal, escaped characters handling has been
added but it is not symmetrical to Marshal for quotes but follows XML
specification.

encoding/xml: fix absence of detection of another : in qualified names (golang#20396)

The occurrence of second : in space and tag name is rejected.

Fixes: golang#7113, golang#7535, golang#8068, golang#8535, golang#10538, golang#11431, golang#13185, golang#16497, golang#20396, golang#20614, golang#20685

Change-Id: Ib4a60347a47d23ff59b63307cebb83b71c7c9165

Commit originally authored by: Constantin Konstantinidis <constantinkonstantinidis@gmail.com>

encoding/xml: fix printing of namespace prefix in tag names

Prefix displays in XML when defined in tag names.
The URL of the name space is also returned for an End Token as
documentation requires to improve idempotency of Marshal/Unmarshal.

Translating the prefix is popping the NS which was unavailable
for translation. Translate for an End Token has been moved inside
the pop element part.

Fixes golang#9519

Change-Id: Id7a14d07c106a76a487b5c4e28d9d563fe061c60

encoding/xml: restore changes lost in merge

See golang#43168.

encoding/xml: gofmt

encoding/xml: minimalIndent -> minIndent to shrink diff

encoding/xml: gofmt

encoding/xml: revert changes to (*Decoder).attrval from master

encoding/xml: restore (*printer).writeIndent to master

encoding/xml: remove comments that don’t change functionality of tests

encoding/xml: use t.Errorf instead of fmt.Errorf

encoding/xml: fix test case for golang#11496

encoding/xml: revert unrelated change in (*Decoder).readName

encoding/xml: remove comments

encoding/xml: remove comments

encoding/xml: edit comments

encoding/xml: add test to ensure '@' is legal in an attr val

encoding/xml: improve test error quoting for readability

encoding/xml: (*Decoder).nsname now strictly parses namespaces

encoding/xml: disable 3/4 tests for golang#43168

I’m not sure what the right fix is for this. Malformed namespaces
(leading or trailing colons, more than 1 colon) should result in an error.

encoding/xml: allow callers to specify namespace prefix

A preferred namespace prefix can now be specified by setting the local
name space to "prefix:space".

In a struct tag:

struct Message {
    XMLName struct{} `xml:"urn:ietf:foo foo:message"`
    Value string `xml:"urn:ietf:foo foo:value"`
}

encoding/xml: use tag prefixes if previously defined

Instead of having redundant xmlns= attrs.

encoding/xml: rename (*printer).popPrefix to popPrefixes

since it pops 1 or more prefixes

encoding/xml: rename printer struct fields

To reflect the fact that prefixes apply to tag names, not just attrs.

encoding/xml: url->uri; reorg comments

encoding/xml: fix comments

encoding/xml: elide redundant xmlns= attrs for default namespace (no prefix)

encoding/xml: move namespace prefix tests

encoding/xml: handle namespace prefixes at the root element

encoding/xml: handle namespaced prefixed attr names

encoding/xml: split out prefixes during reflection, not parsing

encoding/xml: rename tagName to xmlTag; document it

encoding/xml: separate printing xmlns:prefix= attr from creating prefix

encoding/xml: clean up comments

encoding/xml: don’t use xmlTag in attr serialization

encoding/xml: test nested prefixed namespaced tags

encoding/xml: add test for prefixed XML tags without xmlns

encoding/xml: update doc comments

encoding/xml: update comments

encoding/xml: preemptively declare and record all namespace prefixes

Immediate children of XML tags that share a namespace and prefix will now
have that namespace prefix declared on the parent tag.

Explicitly declared namespace prefixes via xmlns:prefix="uri" attributes
will now have their values recorded and reused for marshalling child tags.

This commit reorganizes how namespace prefixes are recorded and detected,
along with how start tags are recorded via a slice of element structs.

Some tests are changed, because the value of the marshalled XML has changed,
but the resulting XML should be equivalent (and correct).

encoding/xml: restore tests with xmlns:prefix= attrs to existing behavior

Use xmlnsURL instead of xmlnsPrefix to specify namespace prefixes.

encoding/xml: prefer unprefixed names where possible

encoding/xml: add EncodeToken tests for explicit prefixes

encoding/xml: add test cases for prefixed local names

encoding/xml: revert change in 8f143f5277; do not preemptively declare XML namespaces
ydnar added a commit to ydnar/go that referenced this issue May 1, 2023
All issues of golang#13400 which are not new functionalities have fixes.
There are minor incompatibilities between them due to the handling of
prefixes. Duplicating a prefix or an namespace is invalid XML.
This is now avoided. XML produced is always valid.

Tests have been added for each fix and example and previous tests
fixed as output is already more compact is some cases.

encoding/xml: fix duplication of namespace tags by encoder (golang#7535)

A tag prefix identifies the name space of the tag and not the default name
space like xmlns="...". Writing the prefix is incorrect when it is bound
to a name space using the standard xmlns:prefix="..." attribute.
This fix skips this print.

Consequences are
 - duplication is avoided in line with name space standard in reference.
 - the _xmlns declaration does not appear anymore. To keep the previous
behaviour, the prefix is printed in all other cases. Token now always
produces well-formed XML except when the explicit name space collides
with the prefix.

Made prefix handling "xmlns="space" xmlns:_xmlns="xmlns" _..." has
be removed in all wants of tests. In some cases, useless declarations like
xmlns:x="x" are still added in line with previous behavior.

encoding/xml: fix unexpected behavior of encoder.Indent("", "") (golang#13185, golang#11431)

MarshalIndent and Marshal share code. When prefix and indent are
empty, the behavior is like Marshal when it should have a minimal
indent, i.e. new line as in documentation.

A boolean is added to the local printer struct which defaults to false.
It is set to true only when MarshalIndent is used and prefix and indent
are empty.

encoding/xml: fix overriding by empty namespace (golang#7113)

The namespace defined by xmlns="value" can be overridden in
every included tag including by the empty namespace xmlns="".
Empty namespace is not authorized with a prefix (xmlns:ns="").

Method to calculate indent of XML handles depth of tag and
its associated namespace. The fix leaves the method active even
when no indent is required.

An XMLName field in a struct means that namespace must be
enforced even if empty. This occurs only on an inner tag as an
overwrite of any non-empty namespace of its outer tag.

To obtain the xmlns="" required, an attribute is added.

encoding/xml: fix panic on embedded unexported XMLName (golang#10538)

By laws of reflection, unexported fields are unreachable by .Value.
XMLName are allowed at any level of an inner struct but the struct
may not be reachable. If XMLName field is found without name,
it cannot be exported and the value is discarded like other fields.
Some comments have been to underline where the issue arises.
Another XMLName test was incorrectly set up and is fixed.
Various cases added in a specific test.

encoding/xml: fix panic of unmarshaling of anonymous structs (golang#16497)

Encoding/xml is using type "typinfo" which provides its own "value" method
using the reflection package. It fails to check for the documented possible
panics of the reflection methods. It is impossible to fix the method as the
parameter is also using reflection.

The fix is to discard anonymous structs which have no value anyway.
Encoder/xml documentation already mentions that fields are accessed using
the reflection package. A relevant test is added.

encoding/xml: fix closing tag failure (golang#20685)

Push/pop of elements name must be done using the eventual prefix together
with the tag name. The operation is moved before the translation of prefix
into its URI. One end element of a test is fixed as expecting the last used
namespace is incorrect.
After closing a tag using a namespace, the valid namespace must be taken
from the opening tag.

encoding/xml: add check of namespaces to detect field names conflicts (golang#8535, golang#11724)

Comparing namespaces of fields was missing and false conflicts were detected.

encoding/xml: fix invalid empty namespace without prefix (golang#8068)

Empty namespace is allowed only if it has no prefix. An error message is now
returned if a prefix exists. A similar case when no prefix is provided,
thus with syntax xmlns:="..." is also rejected.

encoding/xml: fix normalization of attributes values (golang#20614)

The attribute value was read as text. The existing attribute reader logic is
fixed as an attribute may have a namespace or only a prefix. Other
possibilities have been removed.

To keep the behavior of raw token which allows many faults in attributes list,
error handling is heavily using the Strict parameter of the decoder.
Specific tests have been added including list of attributes.

To keep the behavior or unmarshal, escaped characters handling has been
added but it is not symmetrical to Marshal for quotes but follows XML
specification.

encoding/xml: fix absence of detection of another : in qualified names (golang#20396)

The occurrence of second : in space and tag name is rejected.

Fixes: golang#7113, golang#7535, golang#8068, golang#8535, golang#10538, golang#11431, golang#13185, golang#16497, golang#20396, golang#20614, golang#20685

Change-Id: Ib4a60347a47d23ff59b63307cebb83b71c7c9165

Commit originally authored by: Constantin Konstantinidis <constantinkonstantinidis@gmail.com>

encoding/xml: fix printing of namespace prefix in tag names

Prefix displays in XML when defined in tag names.
The URL of the name space is also returned for an End Token as
documentation requires to improve idempotency of Marshal/Unmarshal.

Translating the prefix is popping the NS which was unavailable
for translation. Translate for an End Token has been moved inside
the pop element part.

Fixes golang#9519

Change-Id: Id7a14d07c106a76a487b5c4e28d9d563fe061c60

encoding/xml: restore changes lost in merge

See golang#43168.

encoding/xml: gofmt

encoding/xml: minimalIndent -> minIndent to shrink diff

encoding/xml: gofmt

encoding/xml: revert changes to (*Decoder).attrval from master

encoding/xml: restore (*printer).writeIndent to master

encoding/xml: remove comments that don’t change functionality of tests

encoding/xml: use t.Errorf instead of fmt.Errorf

encoding/xml: fix test case for golang#11496

encoding/xml: revert unrelated change in (*Decoder).readName

encoding/xml: remove comments

encoding/xml: remove comments

encoding/xml: edit comments

encoding/xml: add test to ensure '@' is legal in an attr val

encoding/xml: improve test error quoting for readability

encoding/xml: (*Decoder).nsname now strictly parses namespaces

encoding/xml: disable 3/4 tests for golang#43168

I’m not sure what the right fix is for this. Malformed namespaces
(leading or trailing colons, more than 1 colon) should result in an error.

encoding/xml: allow callers to specify namespace prefix

A preferred namespace prefix can now be specified by setting the local
name space to "prefix:space".

In a struct tag:

struct Message {
    XMLName struct{} `xml:"urn:ietf:foo foo:message"`
    Value string `xml:"urn:ietf:foo foo:value"`
}

encoding/xml: use tag prefixes if previously defined

Instead of having redundant xmlns= attrs.

encoding/xml: rename (*printer).popPrefix to popPrefixes

since it pops 1 or more prefixes

encoding/xml: rename printer struct fields

To reflect the fact that prefixes apply to tag names, not just attrs.

encoding/xml: url->uri; reorg comments

encoding/xml: fix comments

encoding/xml: elide redundant xmlns= attrs for default namespace (no prefix)

encoding/xml: move namespace prefix tests

encoding/xml: handle namespace prefixes at the root element

encoding/xml: handle namespaced prefixed attr names

encoding/xml: split out prefixes during reflection, not parsing

encoding/xml: rename tagName to xmlTag; document it

encoding/xml: separate printing xmlns:prefix= attr from creating prefix

encoding/xml: clean up comments

encoding/xml: don’t use xmlTag in attr serialization

encoding/xml: test nested prefixed namespaced tags

encoding/xml: add test for prefixed XML tags without xmlns

encoding/xml: update doc comments

encoding/xml: update comments

encoding/xml: preemptively declare and record all namespace prefixes

Immediate children of XML tags that share a namespace and prefix will now
have that namespace prefix declared on the parent tag.

Explicitly declared namespace prefixes via xmlns:prefix="uri" attributes
will now have their values recorded and reused for marshalling child tags.

This commit reorganizes how namespace prefixes are recorded and detected,
along with how start tags are recorded via a slice of element structs.

Some tests are changed, because the value of the marshalled XML has changed,
but the resulting XML should be equivalent (and correct).

encoding/xml: restore tests with xmlns:prefix= attrs to existing behavior

Use xmlnsURL instead of xmlnsPrefix to specify namespace prefixes.

encoding/xml: prefer unprefixed names where possible

encoding/xml: add EncodeToken tests for explicit prefixes

encoding/xml: add test cases for prefixed local names

encoding/xml: revert change in 8f143f5277; do not preemptively declare XML namespaces
ydnar added a commit to ydnar/go that referenced this issue May 1, 2023
All issues of golang#13400 which are not new functionalities have fixes.
There are minor incompatibilities between them due to the handling of
prefixes. Duplicating a prefix or an namespace is invalid XML.
This is now avoided. XML produced is always valid.

Tests have been added for each fix and example and previous tests
fixed as output is already more compact is some cases.

encoding/xml: fix duplication of namespace tags by encoder (golang#7535)

A tag prefix identifies the name space of the tag and not the default name
space like xmlns="...". Writing the prefix is incorrect when it is bound
to a name space using the standard xmlns:prefix="..." attribute.
This fix skips this print.

Consequences are
 - duplication is avoided in line with name space standard in reference.
 - the _xmlns declaration does not appear anymore. To keep the previous
behaviour, the prefix is printed in all other cases. Token now always
produces well-formed XML except when the explicit name space collides
with the prefix.

Made prefix handling "xmlns="space" xmlns:_xmlns="xmlns" _..." has
be removed in all wants of tests. In some cases, useless declarations like
xmlns:x="x" are still added in line with previous behavior.

encoding/xml: fix unexpected behavior of encoder.Indent("", "") (golang#13185, golang#11431)

MarshalIndent and Marshal share code. When prefix and indent are
empty, the behavior is like Marshal when it should have a minimal
indent, i.e. new line as in documentation.

A boolean is added to the local printer struct which defaults to false.
It is set to true only when MarshalIndent is used and prefix and indent
are empty.

encoding/xml: fix overriding by empty namespace (golang#7113)

The namespace defined by xmlns="value" can be overridden in
every included tag including by the empty namespace xmlns="".
Empty namespace is not authorized with a prefix (xmlns:ns="").

Method to calculate indent of XML handles depth of tag and
its associated namespace. The fix leaves the method active even
when no indent is required.

An XMLName field in a struct means that namespace must be
enforced even if empty. This occurs only on an inner tag as an
overwrite of any non-empty namespace of its outer tag.

To obtain the xmlns="" required, an attribute is added.

encoding/xml: fix panic on embedded unexported XMLName (golang#10538)

By laws of reflection, unexported fields are unreachable by .Value.
XMLName are allowed at any level of an inner struct but the struct
may not be reachable. If XMLName field is found without name,
it cannot be exported and the value is discarded like other fields.
Some comments have been to underline where the issue arises.
Another XMLName test was incorrectly set up and is fixed.
Various cases added in a specific test.

encoding/xml: fix panic of unmarshaling of anonymous structs (golang#16497)

Encoding/xml is using type "typinfo" which provides its own "value" method
using the reflection package. It fails to check for the documented possible
panics of the reflection methods. It is impossible to fix the method as the
parameter is also using reflection.

The fix is to discard anonymous structs which have no value anyway.
Encoder/xml documentation already mentions that fields are accessed using
the reflection package. A relevant test is added.

encoding/xml: fix closing tag failure (golang#20685)

Push/pop of elements name must be done using the eventual prefix together
with the tag name. The operation is moved before the translation of prefix
into its URI. One end element of a test is fixed as expecting the last used
namespace is incorrect.
After closing a tag using a namespace, the valid namespace must be taken
from the opening tag.

encoding/xml: add check of namespaces to detect field names conflicts (golang#8535, golang#11724)

Comparing namespaces of fields was missing and false conflicts were detected.

encoding/xml: fix invalid empty namespace without prefix (golang#8068)

Empty namespace is allowed only if it has no prefix. An error message is now
returned if a prefix exists. A similar case when no prefix is provided,
thus with syntax xmlns:="..." is also rejected.

encoding/xml: fix normalization of attributes values (golang#20614)

The attribute value was read as text. The existing attribute reader logic is
fixed as an attribute may have a namespace or only a prefix. Other
possibilities have been removed.

To keep the behavior of raw token which allows many faults in attributes list,
error handling is heavily using the Strict parameter of the decoder.
Specific tests have been added including list of attributes.

To keep the behavior or unmarshal, escaped characters handling has been
added but it is not symmetrical to Marshal for quotes but follows XML
specification.

encoding/xml: fix absence of detection of another : in qualified names (golang#20396)

The occurrence of second : in space and tag name is rejected.

Fixes: golang#7113, golang#7535, golang#8068, golang#8535, golang#10538, golang#11431, golang#13185, golang#16497, golang#20396, golang#20614, golang#20685

Change-Id: Ib4a60347a47d23ff59b63307cebb83b71c7c9165

Commit originally authored by: Constantin Konstantinidis <constantinkonstantinidis@gmail.com>

encoding/xml: fix printing of namespace prefix in tag names

Prefix displays in XML when defined in tag names.
The URL of the name space is also returned for an End Token as
documentation requires to improve idempotency of Marshal/Unmarshal.

Translating the prefix is popping the NS which was unavailable
for translation. Translate for an End Token has been moved inside
the pop element part.

Fixes golang#9519

Change-Id: Id7a14d07c106a76a487b5c4e28d9d563fe061c60

encoding/xml: restore changes lost in merge

See golang#43168.

encoding/xml: gofmt

encoding/xml: minimalIndent -> minIndent to shrink diff

encoding/xml: gofmt

encoding/xml: revert changes to (*Decoder).attrval from master

encoding/xml: restore (*printer).writeIndent to master

encoding/xml: remove comments that don’t change functionality of tests

encoding/xml: use t.Errorf instead of fmt.Errorf

encoding/xml: fix test case for golang#11496

encoding/xml: revert unrelated change in (*Decoder).readName

encoding/xml: remove comments

encoding/xml: remove comments

encoding/xml: edit comments

encoding/xml: add test to ensure '@' is legal in an attr val

encoding/xml: improve test error quoting for readability

encoding/xml: (*Decoder).nsname now strictly parses namespaces

encoding/xml: disable 3/4 tests for golang#43168

I’m not sure what the right fix is for this. Malformed namespaces
(leading or trailing colons, more than 1 colon) should result in an error.

encoding/xml: allow callers to specify namespace prefix

A preferred namespace prefix can now be specified by setting the local
name space to "prefix:space".

In a struct tag:

struct Message {
    XMLName struct{} `xml:"urn:ietf:foo foo:message"`
    Value string `xml:"urn:ietf:foo foo:value"`
}

encoding/xml: use tag prefixes if previously defined

Instead of having redundant xmlns= attrs.

encoding/xml: rename (*printer).popPrefix to popPrefixes

since it pops 1 or more prefixes

encoding/xml: rename printer struct fields

To reflect the fact that prefixes apply to tag names, not just attrs.

encoding/xml: url->uri; reorg comments

encoding/xml: fix comments

encoding/xml: elide redundant xmlns= attrs for default namespace (no prefix)

encoding/xml: move namespace prefix tests

encoding/xml: handle namespace prefixes at the root element

encoding/xml: handle namespaced prefixed attr names

encoding/xml: split out prefixes during reflection, not parsing

encoding/xml: rename tagName to xmlTag; document it

encoding/xml: separate printing xmlns:prefix= attr from creating prefix

encoding/xml: clean up comments

encoding/xml: don’t use xmlTag in attr serialization

encoding/xml: test nested prefixed namespaced tags

encoding/xml: add test for prefixed XML tags without xmlns

encoding/xml: update doc comments

encoding/xml: update comments

encoding/xml: preemptively declare and record all namespace prefixes

Immediate children of XML tags that share a namespace and prefix will now
have that namespace prefix declared on the parent tag.

Explicitly declared namespace prefixes via xmlns:prefix="uri" attributes
will now have their values recorded and reused for marshalling child tags.

This commit reorganizes how namespace prefixes are recorded and detected,
along with how start tags are recorded via a slice of element structs.

Some tests are changed, because the value of the marshalled XML has changed,
but the resulting XML should be equivalent (and correct).

encoding/xml: restore tests with xmlns:prefix= attrs to existing behavior

Use xmlnsURL instead of xmlnsPrefix to specify namespace prefixes.

encoding/xml: prefer unprefixed names where possible

encoding/xml: add EncodeToken tests for explicit prefixes

encoding/xml: add test cases for prefixed local names

encoding/xml: revert change in 8f143f5277; do not preemptively declare XML namespaces
ydnar added a commit to ydnar/go that referenced this issue May 1, 2023
All issues of golang#13400 which are not new functionalities have fixes.
There are minor incompatibilities between them due to the handling of
prefixes. Duplicating a prefix or an namespace is invalid XML.
This is now avoided. XML produced is always valid.

Tests have been added for each fix and example and previous tests
fixed as output is already more compact is some cases.

encoding/xml: fix duplication of namespace tags by encoder (golang#7535)

A tag prefix identifies the name space of the tag and not the default name
space like xmlns="...". Writing the prefix is incorrect when it is bound
to a name space using the standard xmlns:prefix="..." attribute.
This fix skips this print.

Consequences are
 - duplication is avoided in line with name space standard in reference.
 - the _xmlns declaration does not appear anymore. To keep the previous
behaviour, the prefix is printed in all other cases. Token now always
produces well-formed XML except when the explicit name space collides
with the prefix.

Made prefix handling "xmlns="space" xmlns:_xmlns="xmlns" _..." has
be removed in all wants of tests. In some cases, useless declarations like
xmlns:x="x" are still added in line with previous behavior.

encoding/xml: fix unexpected behavior of encoder.Indent("", "") (golang#13185, golang#11431)

MarshalIndent and Marshal share code. When prefix and indent are
empty, the behavior is like Marshal when it should have a minimal
indent, i.e. new line as in documentation.

A boolean is added to the local printer struct which defaults to false.
It is set to true only when MarshalIndent is used and prefix and indent
are empty.

encoding/xml: fix overriding by empty namespace (golang#7113)

The namespace defined by xmlns="value" can be overridden in
every included tag including by the empty namespace xmlns="".
Empty namespace is not authorized with a prefix (xmlns:ns="").

Method to calculate indent of XML handles depth of tag and
its associated namespace. The fix leaves the method active even
when no indent is required.

An XMLName field in a struct means that namespace must be
enforced even if empty. This occurs only on an inner tag as an
overwrite of any non-empty namespace of its outer tag.

To obtain the xmlns="" required, an attribute is added.

encoding/xml: fix panic on embedded unexported XMLName (golang#10538)

By laws of reflection, unexported fields are unreachable by .Value.
XMLName are allowed at any level of an inner struct but the struct
may not be reachable. If XMLName field is found without name,
it cannot be exported and the value is discarded like other fields.
Some comments have been to underline where the issue arises.
Another XMLName test was incorrectly set up and is fixed.
Various cases added in a specific test.

encoding/xml: fix panic of unmarshaling of anonymous structs (golang#16497)

Encoding/xml is using type "typinfo" which provides its own "value" method
using the reflection package. It fails to check for the documented possible
panics of the reflection methods. It is impossible to fix the method as the
parameter is also using reflection.

The fix is to discard anonymous structs which have no value anyway.
Encoder/xml documentation already mentions that fields are accessed using
the reflection package. A relevant test is added.

encoding/xml: fix closing tag failure (golang#20685)

Push/pop of elements name must be done using the eventual prefix together
with the tag name. The operation is moved before the translation of prefix
into its URI. One end element of a test is fixed as expecting the last used
namespace is incorrect.
After closing a tag using a namespace, the valid namespace must be taken
from the opening tag.

encoding/xml: add check of namespaces to detect field names conflicts (golang#8535, golang#11724)

Comparing namespaces of fields was missing and false conflicts were detected.

encoding/xml: fix invalid empty namespace without prefix (golang#8068)

Empty namespace is allowed only if it has no prefix. An error message is now
returned if a prefix exists. A similar case when no prefix is provided,
thus with syntax xmlns:="..." is also rejected.

encoding/xml: fix normalization of attributes values (golang#20614)

The attribute value was read as text. The existing attribute reader logic is
fixed as an attribute may have a namespace or only a prefix. Other
possibilities have been removed.

To keep the behavior of raw token which allows many faults in attributes list,
error handling is heavily using the Strict parameter of the decoder.
Specific tests have been added including list of attributes.

To keep the behavior or unmarshal, escaped characters handling has been
added but it is not symmetrical to Marshal for quotes but follows XML
specification.

encoding/xml: fix absence of detection of another : in qualified names (golang#20396)

The occurrence of second : in space and tag name is rejected.

Fixes: golang#7113, golang#7535, golang#8068, golang#8535, golang#10538, golang#11431, golang#13185, golang#16497, golang#20396, golang#20614, golang#20685

Change-Id: Ib4a60347a47d23ff59b63307cebb83b71c7c9165

Commit originally authored by: Constantin Konstantinidis <constantinkonstantinidis@gmail.com>

encoding/xml: fix printing of namespace prefix in tag names

Prefix displays in XML when defined in tag names.
The URL of the name space is also returned for an End Token as
documentation requires to improve idempotency of Marshal/Unmarshal.

Translating the prefix is popping the NS which was unavailable
for translation. Translate for an End Token has been moved inside
the pop element part.

Fixes golang#9519

Change-Id: Id7a14d07c106a76a487b5c4e28d9d563fe061c60

encoding/xml: restore changes lost in merge

See golang#43168.

encoding/xml: gofmt

encoding/xml: minimalIndent -> minIndent to shrink diff

encoding/xml: gofmt

encoding/xml: revert changes to (*Decoder).attrval from master

encoding/xml: restore (*printer).writeIndent to master

encoding/xml: remove comments that don’t change functionality of tests

encoding/xml: use t.Errorf instead of fmt.Errorf

encoding/xml: fix test case for golang#11496

encoding/xml: revert unrelated change in (*Decoder).readName

encoding/xml: remove comments

encoding/xml: remove comments

encoding/xml: edit comments

encoding/xml: add test to ensure '@' is legal in an attr val

encoding/xml: improve test error quoting for readability

encoding/xml: (*Decoder).nsname now strictly parses namespaces

encoding/xml: disable 3/4 tests for golang#43168

I’m not sure what the right fix is for this. Malformed namespaces
(leading or trailing colons, more than 1 colon) should result in an error.

encoding/xml: allow callers to specify namespace prefix

A preferred namespace prefix can now be specified by setting the local
name space to "prefix:space".

In a struct tag:

struct Message {
    XMLName struct{} `xml:"urn:ietf:foo foo:message"`
    Value string `xml:"urn:ietf:foo foo:value"`
}

encoding/xml: use tag prefixes if previously defined

Instead of having redundant xmlns= attrs.

encoding/xml: rename (*printer).popPrefix to popPrefixes

since it pops 1 or more prefixes

encoding/xml: rename printer struct fields

To reflect the fact that prefixes apply to tag names, not just attrs.

encoding/xml: url->uri; reorg comments

encoding/xml: fix comments

encoding/xml: elide redundant xmlns= attrs for default namespace (no prefix)

encoding/xml: move namespace prefix tests

encoding/xml: handle namespace prefixes at the root element

encoding/xml: handle namespaced prefixed attr names

encoding/xml: split out prefixes during reflection, not parsing

encoding/xml: rename tagName to xmlTag; document it

encoding/xml: separate printing xmlns:prefix= attr from creating prefix

encoding/xml: clean up comments

encoding/xml: don’t use xmlTag in attr serialization

encoding/xml: test nested prefixed namespaced tags

encoding/xml: add test for prefixed XML tags without xmlns

encoding/xml: update doc comments

encoding/xml: update comments

encoding/xml: preemptively declare and record all namespace prefixes

Immediate children of XML tags that share a namespace and prefix will now
have that namespace prefix declared on the parent tag.

Explicitly declared namespace prefixes via xmlns:prefix="uri" attributes
will now have their values recorded and reused for marshalling child tags.

This commit reorganizes how namespace prefixes are recorded and detected,
along with how start tags are recorded via a slice of element structs.

Some tests are changed, because the value of the marshalled XML has changed,
but the resulting XML should be equivalent (and correct).

encoding/xml: restore tests with xmlns:prefix= attrs to existing behavior

Use xmlnsURL instead of xmlnsPrefix to specify namespace prefixes.

encoding/xml: prefer unprefixed names where possible

encoding/xml: add EncodeToken tests for explicit prefixes

encoding/xml: add test cases for prefixed local names

encoding/xml: revert change in 8f143f5277; do not preemptively declare XML namespaces

encoding/xml: fix typo in test
ydnar added a commit to ydnar/go that referenced this issue May 3, 2023
All issues of golang#13400 which are not new functionalities have fixes.
There are minor incompatibilities between them due to the handling of
prefixes. Duplicating a prefix or an namespace is invalid XML.
This is now avoided. XML produced is always valid.

Tests have been added for each fix and example and previous tests
fixed as output is already more compact is some cases.

encoding/xml: fix duplication of namespace tags by encoder (golang#7535)

A tag prefix identifies the name space of the tag and not the default name
space like xmlns="...". Writing the prefix is incorrect when it is bound
to a name space using the standard xmlns:prefix="..." attribute.
This fix skips this print.

Consequences are
 - duplication is avoided in line with name space standard in reference.
 - the _xmlns declaration does not appear anymore. To keep the previous
behaviour, the prefix is printed in all other cases. Token now always
produces well-formed XML except when the explicit name space collides
with the prefix.

Made prefix handling "xmlns="space" xmlns:_xmlns="xmlns" _..." has
be removed in all wants of tests. In some cases, useless declarations like
xmlns:x="x" are still added in line with previous behavior.

encoding/xml: fix unexpected behavior of encoder.Indent("", "") (golang#13185, golang#11431)

MarshalIndent and Marshal share code. When prefix and indent are
empty, the behavior is like Marshal when it should have a minimal
indent, i.e. new line as in documentation.

A boolean is added to the local printer struct which defaults to false.
It is set to true only when MarshalIndent is used and prefix and indent
are empty.

encoding/xml: fix overriding by empty namespace (golang#7113)

The namespace defined by xmlns="value" can be overridden in
every included tag including by the empty namespace xmlns="".
Empty namespace is not authorized with a prefix (xmlns:ns="").

Method to calculate indent of XML handles depth of tag and
its associated namespace. The fix leaves the method active even
when no indent is required.

An XMLName field in a struct means that namespace must be
enforced even if empty. This occurs only on an inner tag as an
overwrite of any non-empty namespace of its outer tag.

To obtain the xmlns="" required, an attribute is added.

encoding/xml: fix panic on embedded unexported XMLName (golang#10538)

By laws of reflection, unexported fields are unreachable by .Value.
XMLName are allowed at any level of an inner struct but the struct
may not be reachable. If XMLName field is found without name,
it cannot be exported and the value is discarded like other fields.
Some comments have been to underline where the issue arises.
Another XMLName test was incorrectly set up and is fixed.
Various cases added in a specific test.

encoding/xml: fix panic of unmarshaling of anonymous structs (golang#16497)

Encoding/xml is using type "typinfo" which provides its own "value" method
using the reflection package. It fails to check for the documented possible
panics of the reflection methods. It is impossible to fix the method as the
parameter is also using reflection.

The fix is to discard anonymous structs which have no value anyway.
Encoder/xml documentation already mentions that fields are accessed using
the reflection package. A relevant test is added.

encoding/xml: fix closing tag failure (golang#20685)

Push/pop of elements name must be done using the eventual prefix together
with the tag name. The operation is moved before the translation of prefix
into its URI. One end element of a test is fixed as expecting the last used
namespace is incorrect.
After closing a tag using a namespace, the valid namespace must be taken
from the opening tag.

encoding/xml: add check of namespaces to detect field names conflicts (golang#8535, golang#11724)

Comparing namespaces of fields was missing and false conflicts were detected.

encoding/xml: fix invalid empty namespace without prefix (golang#8068)

Empty namespace is allowed only if it has no prefix. An error message is now
returned if a prefix exists. A similar case when no prefix is provided,
thus with syntax xmlns:="..." is also rejected.

encoding/xml: fix normalization of attributes values (golang#20614)

The attribute value was read as text. The existing attribute reader logic is
fixed as an attribute may have a namespace or only a prefix. Other
possibilities have been removed.

To keep the behavior of raw token which allows many faults in attributes list,
error handling is heavily using the Strict parameter of the decoder.
Specific tests have been added including list of attributes.

To keep the behavior or unmarshal, escaped characters handling has been
added but it is not symmetrical to Marshal for quotes but follows XML
specification.

encoding/xml: fix absence of detection of another : in qualified names (golang#20396)

The occurrence of second : in space and tag name is rejected.

Fixes: golang#7113, golang#7535, golang#8068, golang#8535, golang#10538, golang#11431, golang#13185, golang#16497, golang#20396, golang#20614, golang#20685

Change-Id: Ib4a60347a47d23ff59b63307cebb83b71c7c9165

Commit originally authored by: Constantin Konstantinidis <constantinkonstantinidis@gmail.com>

encoding/xml: fix printing of namespace prefix in tag names

Prefix displays in XML when defined in tag names.
The URL of the name space is also returned for an End Token as
documentation requires to improve idempotency of Marshal/Unmarshal.

Translating the prefix is popping the NS which was unavailable
for translation. Translate for an End Token has been moved inside
the pop element part.

Fixes golang#9519

Change-Id: Id7a14d07c106a76a487b5c4e28d9d563fe061c60

encoding/xml: restore changes lost in merge

See golang#43168.

encoding/xml: gofmt

encoding/xml: minimalIndent -> minIndent to shrink diff

encoding/xml: gofmt

encoding/xml: revert changes to (*Decoder).attrval from master

encoding/xml: restore (*printer).writeIndent to master

encoding/xml: remove comments that don’t change functionality of tests

encoding/xml: use t.Errorf instead of fmt.Errorf

encoding/xml: fix test case for golang#11496

encoding/xml: revert unrelated change in (*Decoder).readName

encoding/xml: remove comments

encoding/xml: remove comments

encoding/xml: edit comments

encoding/xml: add test to ensure '@' is legal in an attr val

encoding/xml: improve test error quoting for readability

encoding/xml: (*Decoder).nsname now strictly parses namespaces

encoding/xml: disable 3/4 tests for golang#43168

I’m not sure what the right fix is for this. Malformed namespaces
(leading or trailing colons, more than 1 colon) should result in an error.

encoding/xml: allow callers to specify namespace prefix

A preferred namespace prefix can now be specified by setting the local
name space to "prefix:space".

In a struct tag:

struct Message {
    XMLName struct{} `xml:"urn:ietf:foo foo:message"`
    Value string `xml:"urn:ietf:foo foo:value"`
}

encoding/xml: use tag prefixes if previously defined

Instead of having redundant xmlns= attrs.

encoding/xml: rename (*printer).popPrefix to popPrefixes

since it pops 1 or more prefixes

encoding/xml: rename printer struct fields

To reflect the fact that prefixes apply to tag names, not just attrs.

encoding/xml: url->uri; reorg comments

encoding/xml: fix comments

encoding/xml: elide redundant xmlns= attrs for default namespace (no prefix)

encoding/xml: move namespace prefix tests

encoding/xml: handle namespace prefixes at the root element

encoding/xml: handle namespaced prefixed attr names

encoding/xml: split out prefixes during reflection, not parsing

encoding/xml: rename tagName to xmlTag; document it

encoding/xml: separate printing xmlns:prefix= attr from creating prefix

encoding/xml: clean up comments

encoding/xml: don’t use xmlTag in attr serialization

encoding/xml: test nested prefixed namespaced tags

encoding/xml: add test for prefixed XML tags without xmlns

encoding/xml: update doc comments

encoding/xml: update comments

encoding/xml: preemptively declare and record all namespace prefixes

Immediate children of XML tags that share a namespace and prefix will now
have that namespace prefix declared on the parent tag.

Explicitly declared namespace prefixes via xmlns:prefix="uri" attributes
will now have their values recorded and reused for marshalling child tags.

This commit reorganizes how namespace prefixes are recorded and detected,
along with how start tags are recorded via a slice of element structs.

Some tests are changed, because the value of the marshalled XML has changed,
but the resulting XML should be equivalent (and correct).

encoding/xml: restore tests with xmlns:prefix= attrs to existing behavior

Use xmlnsURL instead of xmlnsPrefix to specify namespace prefixes.

encoding/xml: prefer unprefixed names where possible

encoding/xml: add EncodeToken tests for explicit prefixes

encoding/xml: add test cases for prefixed local names

encoding/xml: revert change in 8f143f5277; do not preemptively declare XML namespaces

encoding/xml: fix typo in test
ydnar added a commit to ydnar/go that referenced this issue May 5, 2023
All issues of golang#13400 which are not new functionalities have fixes.
There are minor incompatibilities between them due to the handling of
prefixes. Duplicating a prefix or an namespace is invalid XML.
This is now avoided. XML produced is always valid.

Tests have been added for each fix and example and previous tests
fixed as output is already more compact is some cases.

encoding/xml: fix duplication of namespace tags by encoder (golang#7535)

A tag prefix identifies the name space of the tag and not the default name
space like xmlns="...". Writing the prefix is incorrect when it is bound
to a name space using the standard xmlns:prefix="..." attribute.
This fix skips this print.

Consequences are
 - duplication is avoided in line with name space standard in reference.
 - the _xmlns declaration does not appear anymore. To keep the previous
behaviour, the prefix is printed in all other cases. Token now always
produces well-formed XML except when the explicit name space collides
with the prefix.

Made prefix handling "xmlns="space" xmlns:_xmlns="xmlns" _..." has
be removed in all wants of tests. In some cases, useless declarations like
xmlns:x="x" are still added in line with previous behavior.

encoding/xml: fix unexpected behavior of encoder.Indent("", "") (golang#13185, golang#11431)

MarshalIndent and Marshal share code. When prefix and indent are
empty, the behavior is like Marshal when it should have a minimal
indent, i.e. new line as in documentation.

A boolean is added to the local printer struct which defaults to false.
It is set to true only when MarshalIndent is used and prefix and indent
are empty.

encoding/xml: fix overriding by empty namespace (golang#7113)

The namespace defined by xmlns="value" can be overridden in
every included tag including by the empty namespace xmlns="".
Empty namespace is not authorized with a prefix (xmlns:ns="").

Method to calculate indent of XML handles depth of tag and
its associated namespace. The fix leaves the method active even
when no indent is required.

An XMLName field in a struct means that namespace must be
enforced even if empty. This occurs only on an inner tag as an
overwrite of any non-empty namespace of its outer tag.

To obtain the xmlns="" required, an attribute is added.

encoding/xml: fix panic on embedded unexported XMLName (golang#10538)

By laws of reflection, unexported fields are unreachable by .Value.
XMLName are allowed at any level of an inner struct but the struct
may not be reachable. If XMLName field is found without name,
it cannot be exported and the value is discarded like other fields.
Some comments have been to underline where the issue arises.
Another XMLName test was incorrectly set up and is fixed.
Various cases added in a specific test.

encoding/xml: fix panic of unmarshaling of anonymous structs (golang#16497)

Encoding/xml is using type "typinfo" which provides its own "value" method
using the reflection package. It fails to check for the documented possible
panics of the reflection methods. It is impossible to fix the method as the
parameter is also using reflection.

The fix is to discard anonymous structs which have no value anyway.
Encoder/xml documentation already mentions that fields are accessed using
the reflection package. A relevant test is added.

encoding/xml: fix closing tag failure (golang#20685)

Push/pop of elements name must be done using the eventual prefix together
with the tag name. The operation is moved before the translation of prefix
into its URI. One end element of a test is fixed as expecting the last used
namespace is incorrect.
After closing a tag using a namespace, the valid namespace must be taken
from the opening tag.

encoding/xml: add check of namespaces to detect field names conflicts (golang#8535, golang#11724)

Comparing namespaces of fields was missing and false conflicts were detected.

encoding/xml: fix invalid empty namespace without prefix (golang#8068)

Empty namespace is allowed only if it has no prefix. An error message is now
returned if a prefix exists. A similar case when no prefix is provided,
thus with syntax xmlns:="..." is also rejected.

encoding/xml: fix normalization of attributes values (golang#20614)

The attribute value was read as text. The existing attribute reader logic is
fixed as an attribute may have a namespace or only a prefix. Other
possibilities have been removed.

To keep the behavior of raw token which allows many faults in attributes list,
error handling is heavily using the Strict parameter of the decoder.
Specific tests have been added including list of attributes.

To keep the behavior or unmarshal, escaped characters handling has been
added but it is not symmetrical to Marshal for quotes but follows XML
specification.

encoding/xml: fix absence of detection of another : in qualified names (golang#20396)

The occurrence of second : in space and tag name is rejected.

Fixes: golang#7113, golang#7535, golang#8068, golang#8535, golang#10538, golang#11431, golang#13185, golang#16497, golang#20396, golang#20614, golang#20685

Change-Id: Ib4a60347a47d23ff59b63307cebb83b71c7c9165

Commit originally authored by: Constantin Konstantinidis <constantinkonstantinidis@gmail.com>

encoding/xml: fix printing of namespace prefix in tag names

Prefix displays in XML when defined in tag names.
The URL of the name space is also returned for an End Token as
documentation requires to improve idempotency of Marshal/Unmarshal.

Translating the prefix is popping the NS which was unavailable
for translation. Translate for an End Token has been moved inside
the pop element part.

Fixes golang#9519

Change-Id: Id7a14d07c106a76a487b5c4e28d9d563fe061c60

encoding/xml: restore changes lost in merge

See golang#43168.

encoding/xml: gofmt

encoding/xml: minimalIndent -> minIndent to shrink diff

encoding/xml: gofmt

encoding/xml: revert changes to (*Decoder).attrval from master

encoding/xml: restore (*printer).writeIndent to master

encoding/xml: remove comments that don’t change functionality of tests

encoding/xml: use t.Errorf instead of fmt.Errorf

encoding/xml: fix test case for golang#11496

encoding/xml: revert unrelated change in (*Decoder).readName

encoding/xml: remove comments

encoding/xml: remove comments

encoding/xml: edit comments

encoding/xml: add test to ensure '@' is legal in an attr val

encoding/xml: improve test error quoting for readability

encoding/xml: (*Decoder).nsname now strictly parses namespaces

encoding/xml: disable 3/4 tests for golang#43168

I’m not sure what the right fix is for this. Malformed namespaces
(leading or trailing colons, more than 1 colon) should result in an error.

encoding/xml: allow callers to specify namespace prefix

A preferred namespace prefix can now be specified by setting the local
name space to "prefix:space".

In a struct tag:

struct Message {
    XMLName struct{} `xml:"urn:ietf:foo foo:message"`
    Value string `xml:"urn:ietf:foo foo:value"`
}

encoding/xml: use tag prefixes if previously defined

Instead of having redundant xmlns= attrs.

encoding/xml: rename (*printer).popPrefix to popPrefixes

since it pops 1 or more prefixes

encoding/xml: rename printer struct fields

To reflect the fact that prefixes apply to tag names, not just attrs.

encoding/xml: url->uri; reorg comments

encoding/xml: fix comments

encoding/xml: elide redundant xmlns= attrs for default namespace (no prefix)

encoding/xml: move namespace prefix tests

encoding/xml: handle namespace prefixes at the root element

encoding/xml: handle namespaced prefixed attr names

encoding/xml: split out prefixes during reflection, not parsing

encoding/xml: rename tagName to xmlTag; document it

encoding/xml: separate printing xmlns:prefix= attr from creating prefix

encoding/xml: clean up comments

encoding/xml: don’t use xmlTag in attr serialization

encoding/xml: test nested prefixed namespaced tags

encoding/xml: add test for prefixed XML tags without xmlns

encoding/xml: update doc comments

encoding/xml: update comments

encoding/xml: preemptively declare and record all namespace prefixes

Immediate children of XML tags that share a namespace and prefix will now
have that namespace prefix declared on the parent tag.

Explicitly declared namespace prefixes via xmlns:prefix="uri" attributes
will now have their values recorded and reused for marshalling child tags.

This commit reorganizes how namespace prefixes are recorded and detected,
along with how start tags are recorded via a slice of element structs.

Some tests are changed, because the value of the marshalled XML has changed,
but the resulting XML should be equivalent (and correct).

encoding/xml: restore tests with xmlns:prefix= attrs to existing behavior

Use xmlnsURL instead of xmlnsPrefix to specify namespace prefixes.

encoding/xml: prefer unprefixed names where possible

encoding/xml: add EncodeToken tests for explicit prefixes

encoding/xml: add test cases for prefixed local names

encoding/xml: revert change in 8f143f5277; do not preemptively declare XML namespaces

encoding/xml: fix typo in test
ydnar added a commit to ydnar/go that referenced this issue May 9, 2023
All issues of golang#13400 which are not new functionalities have fixes.
There are minor incompatibilities between them due to the handling of
prefixes. Duplicating a prefix or an namespace is invalid XML.
This is now avoided. XML produced is always valid.

Tests have been added for each fix and example and previous tests
fixed as output is already more compact is some cases.

encoding/xml: fix duplication of namespace tags by encoder (golang#7535)

A tag prefix identifies the name space of the tag and not the default name
space like xmlns="...". Writing the prefix is incorrect when it is bound
to a name space using the standard xmlns:prefix="..." attribute.
This fix skips this print.

Consequences are
 - duplication is avoided in line with name space standard in reference.
 - the _xmlns declaration does not appear anymore. To keep the previous
behaviour, the prefix is printed in all other cases. Token now always
produces well-formed XML except when the explicit name space collides
with the prefix.

Made prefix handling "xmlns="space" xmlns:_xmlns="xmlns" _..." has
be removed in all wants of tests. In some cases, useless declarations like
xmlns:x="x" are still added in line with previous behavior.

encoding/xml: fix unexpected behavior of encoder.Indent("", "") (golang#13185, golang#11431)

MarshalIndent and Marshal share code. When prefix and indent are
empty, the behavior is like Marshal when it should have a minimal
indent, i.e. new line as in documentation.

A boolean is added to the local printer struct which defaults to false.
It is set to true only when MarshalIndent is used and prefix and indent
are empty.

encoding/xml: fix overriding by empty namespace (golang#7113)

The namespace defined by xmlns="value" can be overridden in
every included tag including by the empty namespace xmlns="".
Empty namespace is not authorized with a prefix (xmlns:ns="").

Method to calculate indent of XML handles depth of tag and
its associated namespace. The fix leaves the method active even
when no indent is required.

An XMLName field in a struct means that namespace must be
enforced even if empty. This occurs only on an inner tag as an
overwrite of any non-empty namespace of its outer tag.

To obtain the xmlns="" required, an attribute is added.

encoding/xml: fix panic on embedded unexported XMLName (golang#10538)

By laws of reflection, unexported fields are unreachable by .Value.
XMLName are allowed at any level of an inner struct but the struct
may not be reachable. If XMLName field is found without name,
it cannot be exported and the value is discarded like other fields.
Some comments have been to underline where the issue arises.
Another XMLName test was incorrectly set up and is fixed.
Various cases added in a specific test.

encoding/xml: fix panic of unmarshaling of anonymous structs (golang#16497)

Encoding/xml is using type "typinfo" which provides its own "value" method
using the reflection package. It fails to check for the documented possible
panics of the reflection methods. It is impossible to fix the method as the
parameter is also using reflection.

The fix is to discard anonymous structs which have no value anyway.
Encoder/xml documentation already mentions that fields are accessed using
the reflection package. A relevant test is added.

encoding/xml: fix closing tag failure (golang#20685)

Push/pop of elements name must be done using the eventual prefix together
with the tag name. The operation is moved before the translation of prefix
into its URI. One end element of a test is fixed as expecting the last used
namespace is incorrect.
After closing a tag using a namespace, the valid namespace must be taken
from the opening tag.

encoding/xml: add check of namespaces to detect field names conflicts (golang#8535, golang#11724)

Comparing namespaces of fields was missing and false conflicts were detected.

encoding/xml: fix invalid empty namespace without prefix (golang#8068)

Empty namespace is allowed only if it has no prefix. An error message is now
returned if a prefix exists. A similar case when no prefix is provided,
thus with syntax xmlns:="..." is also rejected.

encoding/xml: fix normalization of attributes values (golang#20614)

The attribute value was read as text. The existing attribute reader logic is
fixed as an attribute may have a namespace or only a prefix. Other
possibilities have been removed.

To keep the behavior of raw token which allows many faults in attributes list,
error handling is heavily using the Strict parameter of the decoder.
Specific tests have been added including list of attributes.

To keep the behavior or unmarshal, escaped characters handling has been
added but it is not symmetrical to Marshal for quotes but follows XML
specification.

encoding/xml: fix absence of detection of another : in qualified names (golang#20396)

The occurrence of second : in space and tag name is rejected.

Fixes: golang#7113, golang#7535, golang#8068, golang#8535, golang#10538, golang#11431, golang#13185, golang#16497, golang#20396, golang#20614, golang#20685

Change-Id: Ib4a60347a47d23ff59b63307cebb83b71c7c9165

Commit originally authored by: Constantin Konstantinidis <constantinkonstantinidis@gmail.com>

encoding/xml: fix printing of namespace prefix in tag names

Prefix displays in XML when defined in tag names.
The URL of the name space is also returned for an End Token as
documentation requires to improve idempotency of Marshal/Unmarshal.

Translating the prefix is popping the NS which was unavailable
for translation. Translate for an End Token has been moved inside
the pop element part.

Fixes golang#9519

Change-Id: Id7a14d07c106a76a487b5c4e28d9d563fe061c60

encoding/xml: restore changes lost in merge

See golang#43168.

encoding/xml: gofmt

encoding/xml: minimalIndent -> minIndent to shrink diff

encoding/xml: gofmt

encoding/xml: revert changes to (*Decoder).attrval from master

encoding/xml: restore (*printer).writeIndent to master

encoding/xml: remove comments that don’t change functionality of tests

encoding/xml: use t.Errorf instead of fmt.Errorf

encoding/xml: fix test case for golang#11496

encoding/xml: revert unrelated change in (*Decoder).readName

encoding/xml: remove comments

encoding/xml: remove comments

encoding/xml: edit comments

encoding/xml: add test to ensure '@' is legal in an attr val

encoding/xml: improve test error quoting for readability

encoding/xml: (*Decoder).nsname now strictly parses namespaces

encoding/xml: disable 3/4 tests for golang#43168

I’m not sure what the right fix is for this. Malformed namespaces
(leading or trailing colons, more than 1 colon) should result in an error.

encoding/xml: allow callers to specify namespace prefix

A preferred namespace prefix can now be specified by setting the local
name space to "prefix:space".

In a struct tag:

struct Message {
    XMLName struct{} `xml:"urn:ietf:foo foo:message"`
    Value string `xml:"urn:ietf:foo foo:value"`
}

encoding/xml: use tag prefixes if previously defined

Instead of having redundant xmlns= attrs.

encoding/xml: rename (*printer).popPrefix to popPrefixes

since it pops 1 or more prefixes

encoding/xml: rename printer struct fields

To reflect the fact that prefixes apply to tag names, not just attrs.

encoding/xml: url->uri; reorg comments

encoding/xml: fix comments

encoding/xml: elide redundant xmlns= attrs for default namespace (no prefix)

encoding/xml: move namespace prefix tests

encoding/xml: handle namespace prefixes at the root element

encoding/xml: handle namespaced prefixed attr names

encoding/xml: split out prefixes during reflection, not parsing

encoding/xml: rename tagName to xmlTag; document it

encoding/xml: separate printing xmlns:prefix= attr from creating prefix

encoding/xml: clean up comments

encoding/xml: don’t use xmlTag in attr serialization

encoding/xml: test nested prefixed namespaced tags

encoding/xml: add test for prefixed XML tags without xmlns

encoding/xml: update doc comments

encoding/xml: update comments

encoding/xml: preemptively declare and record all namespace prefixes

Immediate children of XML tags that share a namespace and prefix will now
have that namespace prefix declared on the parent tag.

Explicitly declared namespace prefixes via xmlns:prefix="uri" attributes
will now have their values recorded and reused for marshalling child tags.

This commit reorganizes how namespace prefixes are recorded and detected,
along with how start tags are recorded via a slice of element structs.

Some tests are changed, because the value of the marshalled XML has changed,
but the resulting XML should be equivalent (and correct).

encoding/xml: restore tests with xmlns:prefix= attrs to existing behavior

Use xmlnsURL instead of xmlnsPrefix to specify namespace prefixes.

encoding/xml: prefer unprefixed names where possible

encoding/xml: add EncodeToken tests for explicit prefixes

encoding/xml: add test cases for prefixed local names

encoding/xml: revert change in 8f143f5277; do not preemptively declare XML namespaces

encoding/xml: fix typo in test
ydnar added a commit to ydnar/go that referenced this issue May 15, 2023
All issues of golang#13400 which are not new functionalities have fixes.
There are minor incompatibilities between them due to the handling of
prefixes. Duplicating a prefix or an namespace is invalid XML.
This is now avoided. XML produced is always valid.

Tests have been added for each fix and example and previous tests
fixed as output is already more compact is some cases.

encoding/xml: fix duplication of namespace tags by encoder (golang#7535)

A tag prefix identifies the name space of the tag and not the default name
space like xmlns="...". Writing the prefix is incorrect when it is bound
to a name space using the standard xmlns:prefix="..." attribute.
This fix skips this print.

Consequences are
 - duplication is avoided in line with name space standard in reference.
 - the _xmlns declaration does not appear anymore. To keep the previous
behaviour, the prefix is printed in all other cases. Token now always
produces well-formed XML except when the explicit name space collides
with the prefix.

Made prefix handling "xmlns="space" xmlns:_xmlns="xmlns" _..." has
be removed in all wants of tests. In some cases, useless declarations like
xmlns:x="x" are still added in line with previous behavior.

encoding/xml: fix unexpected behavior of encoder.Indent("", "") (golang#13185, golang#11431)

MarshalIndent and Marshal share code. When prefix and indent are
empty, the behavior is like Marshal when it should have a minimal
indent, i.e. new line as in documentation.

A boolean is added to the local printer struct which defaults to false.
It is set to true only when MarshalIndent is used and prefix and indent
are empty.

encoding/xml: fix overriding by empty namespace (golang#7113)

The namespace defined by xmlns="value" can be overridden in
every included tag including by the empty namespace xmlns="".
Empty namespace is not authorized with a prefix (xmlns:ns="").

Method to calculate indent of XML handles depth of tag and
its associated namespace. The fix leaves the method active even
when no indent is required.

An XMLName field in a struct means that namespace must be
enforced even if empty. This occurs only on an inner tag as an
overwrite of any non-empty namespace of its outer tag.

To obtain the xmlns="" required, an attribute is added.

encoding/xml: fix panic on embedded unexported XMLName (golang#10538)

By laws of reflection, unexported fields are unreachable by .Value.
XMLName are allowed at any level of an inner struct but the struct
may not be reachable. If XMLName field is found without name,
it cannot be exported and the value is discarded like other fields.
Some comments have been to underline where the issue arises.
Another XMLName test was incorrectly set up and is fixed.
Various cases added in a specific test.

encoding/xml: fix panic of unmarshaling of anonymous structs (golang#16497)

Encoding/xml is using type "typinfo" which provides its own "value" method
using the reflection package. It fails to check for the documented possible
panics of the reflection methods. It is impossible to fix the method as the
parameter is also using reflection.

The fix is to discard anonymous structs which have no value anyway.
Encoder/xml documentation already mentions that fields are accessed using
the reflection package. A relevant test is added.

encoding/xml: fix closing tag failure (golang#20685)

Push/pop of elements name must be done using the eventual prefix together
with the tag name. The operation is moved before the translation of prefix
into its URI. One end element of a test is fixed as expecting the last used
namespace is incorrect.
After closing a tag using a namespace, the valid namespace must be taken
from the opening tag.

encoding/xml: add check of namespaces to detect field names conflicts (golang#8535, golang#11724)

Comparing namespaces of fields was missing and false conflicts were detected.

encoding/xml: fix invalid empty namespace without prefix (golang#8068)

Empty namespace is allowed only if it has no prefix. An error message is now
returned if a prefix exists. A similar case when no prefix is provided,
thus with syntax xmlns:="..." is also rejected.

encoding/xml: fix normalization of attributes values (golang#20614)

The attribute value was read as text. The existing attribute reader logic is
fixed as an attribute may have a namespace or only a prefix. Other
possibilities have been removed.

To keep the behavior of raw token which allows many faults in attributes list,
error handling is heavily using the Strict parameter of the decoder.
Specific tests have been added including list of attributes.

To keep the behavior or unmarshal, escaped characters handling has been
added but it is not symmetrical to Marshal for quotes but follows XML
specification.

encoding/xml: fix absence of detection of another : in qualified names (golang#20396)

The occurrence of second : in space and tag name is rejected.

Fixes: golang#7113, golang#7535, golang#8068, golang#8535, golang#10538, golang#11431, golang#13185, golang#16497, golang#20396, golang#20614, golang#20685

Change-Id: Ib4a60347a47d23ff59b63307cebb83b71c7c9165

Commit originally authored by: Constantin Konstantinidis <constantinkonstantinidis@gmail.com>

encoding/xml: fix printing of namespace prefix in tag names

Prefix displays in XML when defined in tag names.
The URL of the name space is also returned for an End Token as
documentation requires to improve idempotency of Marshal/Unmarshal.

Translating the prefix is popping the NS which was unavailable
for translation. Translate for an End Token has been moved inside
the pop element part.

Fixes golang#9519

Change-Id: Id7a14d07c106a76a487b5c4e28d9d563fe061c60

encoding/xml: restore changes lost in merge

See golang#43168.

encoding/xml: gofmt

encoding/xml: minimalIndent -> minIndent to shrink diff

encoding/xml: gofmt

encoding/xml: revert changes to (*Decoder).attrval from master

encoding/xml: restore (*printer).writeIndent to master

encoding/xml: remove comments that don’t change functionality of tests

encoding/xml: use t.Errorf instead of fmt.Errorf

encoding/xml: fix test case for golang#11496

encoding/xml: revert unrelated change in (*Decoder).readName

encoding/xml: remove comments

encoding/xml: remove comments

encoding/xml: edit comments

encoding/xml: add test to ensure '@' is legal in an attr val

encoding/xml: improve test error quoting for readability

encoding/xml: (*Decoder).nsname now strictly parses namespaces

encoding/xml: disable 3/4 tests for golang#43168

I’m not sure what the right fix is for this. Malformed namespaces
(leading or trailing colons, more than 1 colon) should result in an error.

encoding/xml: allow callers to specify namespace prefix

A preferred namespace prefix can now be specified by setting the local
name space to "prefix:space".

In a struct tag:

struct Message {
    XMLName struct{} `xml:"urn:ietf:foo foo:message"`
    Value string `xml:"urn:ietf:foo foo:value"`
}

encoding/xml: use tag prefixes if previously defined

Instead of having redundant xmlns= attrs.

encoding/xml: rename (*printer).popPrefix to popPrefixes

since it pops 1 or more prefixes

encoding/xml: rename printer struct fields

To reflect the fact that prefixes apply to tag names, not just attrs.

encoding/xml: url->uri; reorg comments

encoding/xml: fix comments

encoding/xml: elide redundant xmlns= attrs for default namespace (no prefix)

encoding/xml: move namespace prefix tests

encoding/xml: handle namespace prefixes at the root element

encoding/xml: handle namespaced prefixed attr names

encoding/xml: split out prefixes during reflection, not parsing

encoding/xml: rename tagName to xmlTag; document it

encoding/xml: separate printing xmlns:prefix= attr from creating prefix

encoding/xml: clean up comments

encoding/xml: don’t use xmlTag in attr serialization

encoding/xml: test nested prefixed namespaced tags

encoding/xml: add test for prefixed XML tags without xmlns

encoding/xml: update doc comments

encoding/xml: update comments

encoding/xml: preemptively declare and record all namespace prefixes

Immediate children of XML tags that share a namespace and prefix will now
have that namespace prefix declared on the parent tag.

Explicitly declared namespace prefixes via xmlns:prefix="uri" attributes
will now have their values recorded and reused for marshalling child tags.

This commit reorganizes how namespace prefixes are recorded and detected,
along with how start tags are recorded via a slice of element structs.

Some tests are changed, because the value of the marshalled XML has changed,
but the resulting XML should be equivalent (and correct).

encoding/xml: restore tests with xmlns:prefix= attrs to existing behavior

Use xmlnsURL instead of xmlnsPrefix to specify namespace prefixes.

encoding/xml: prefer unprefixed names where possible

encoding/xml: add EncodeToken tests for explicit prefixes

encoding/xml: add test cases for prefixed local names

encoding/xml: revert change in 8f143f5277; do not preemptively declare XML namespaces

encoding/xml: fix typo in test
ydnar added a commit to ydnar/go that referenced this issue May 21, 2023
All issues of golang#13400 which are not new functionalities have fixes.
There are minor incompatibilities between them due to the handling of
prefixes. Duplicating a prefix or an namespace is invalid XML.
This is now avoided. XML produced is always valid.

Tests have been added for each fix and example and previous tests
fixed as output is already more compact is some cases.

encoding/xml: fix duplication of namespace tags by encoder (golang#7535)

A tag prefix identifies the name space of the tag and not the default name
space like xmlns="...". Writing the prefix is incorrect when it is bound
to a name space using the standard xmlns:prefix="..." attribute.
This fix skips this print.

Consequences are
 - duplication is avoided in line with name space standard in reference.
 - the _xmlns declaration does not appear anymore. To keep the previous
behaviour, the prefix is printed in all other cases. Token now always
produces well-formed XML except when the explicit name space collides
with the prefix.

Made prefix handling "xmlns="space" xmlns:_xmlns="xmlns" _..." has
be removed in all wants of tests. In some cases, useless declarations like
xmlns:x="x" are still added in line with previous behavior.

encoding/xml: fix unexpected behavior of encoder.Indent("", "") (golang#13185, golang#11431)

MarshalIndent and Marshal share code. When prefix and indent are
empty, the behavior is like Marshal when it should have a minimal
indent, i.e. new line as in documentation.

A boolean is added to the local printer struct which defaults to false.
It is set to true only when MarshalIndent is used and prefix and indent
are empty.

encoding/xml: fix overriding by empty namespace (golang#7113)

The namespace defined by xmlns="value" can be overridden in
every included tag including by the empty namespace xmlns="".
Empty namespace is not authorized with a prefix (xmlns:ns="").

Method to calculate indent of XML handles depth of tag and
its associated namespace. The fix leaves the method active even
when no indent is required.

An XMLName field in a struct means that namespace must be
enforced even if empty. This occurs only on an inner tag as an
overwrite of any non-empty namespace of its outer tag.

To obtain the xmlns="" required, an attribute is added.

encoding/xml: fix panic on embedded unexported XMLName (golang#10538)

By laws of reflection, unexported fields are unreachable by .Value.
XMLName are allowed at any level of an inner struct but the struct
may not be reachable. If XMLName field is found without name,
it cannot be exported and the value is discarded like other fields.
Some comments have been to underline where the issue arises.
Another XMLName test was incorrectly set up and is fixed.
Various cases added in a specific test.

encoding/xml: fix panic of unmarshaling of anonymous structs (golang#16497)

Encoding/xml is using type "typinfo" which provides its own "value" method
using the reflection package. It fails to check for the documented possible
panics of the reflection methods. It is impossible to fix the method as the
parameter is also using reflection.

The fix is to discard anonymous structs which have no value anyway.
Encoder/xml documentation already mentions that fields are accessed using
the reflection package. A relevant test is added.

encoding/xml: fix closing tag failure (golang#20685)

Push/pop of elements name must be done using the eventual prefix together
with the tag name. The operation is moved before the translation of prefix
into its URI. One end element of a test is fixed as expecting the last used
namespace is incorrect.
After closing a tag using a namespace, the valid namespace must be taken
from the opening tag.

encoding/xml: add check of namespaces to detect field names conflicts (golang#8535, golang#11724)

Comparing namespaces of fields was missing and false conflicts were detected.

encoding/xml: fix invalid empty namespace without prefix (golang#8068)

Empty namespace is allowed only if it has no prefix. An error message is now
returned if a prefix exists. A similar case when no prefix is provided,
thus with syntax xmlns:="..." is also rejected.

encoding/xml: fix normalization of attributes values (golang#20614)

The attribute value was read as text. The existing attribute reader logic is
fixed as an attribute may have a namespace or only a prefix. Other
possibilities have been removed.

To keep the behavior of raw token which allows many faults in attributes list,
error handling is heavily using the Strict parameter of the decoder.
Specific tests have been added including list of attributes.

To keep the behavior or unmarshal, escaped characters handling has been
added but it is not symmetrical to Marshal for quotes but follows XML
specification.

encoding/xml: fix absence of detection of another : in qualified names (golang#20396)

The occurrence of second : in space and tag name is rejected.

Fixes: golang#7113, golang#7535, golang#8068, golang#8535, golang#10538, golang#11431, golang#13185, golang#16497, golang#20396, golang#20614, golang#20685

Change-Id: Ib4a60347a47d23ff59b63307cebb83b71c7c9165

Commit originally authored by: Constantin Konstantinidis <constantinkonstantinidis@gmail.com>

encoding/xml: fix printing of namespace prefix in tag names

Prefix displays in XML when defined in tag names.
The URL of the name space is also returned for an End Token as
documentation requires to improve idempotency of Marshal/Unmarshal.

Translating the prefix is popping the NS which was unavailable
for translation. Translate for an End Token has been moved inside
the pop element part.

Fixes golang#9519

Change-Id: Id7a14d07c106a76a487b5c4e28d9d563fe061c60

encoding/xml: restore changes lost in merge

See golang#43168.

encoding/xml: gofmt

encoding/xml: minimalIndent -> minIndent to shrink diff

encoding/xml: gofmt

encoding/xml: revert changes to (*Decoder).attrval from master

encoding/xml: restore (*printer).writeIndent to master

encoding/xml: remove comments that don’t change functionality of tests

encoding/xml: use t.Errorf instead of fmt.Errorf

encoding/xml: fix test case for golang#11496

encoding/xml: revert unrelated change in (*Decoder).readName

encoding/xml: remove comments

encoding/xml: remove comments

encoding/xml: edit comments

encoding/xml: add test to ensure '@' is legal in an attr val

encoding/xml: improve test error quoting for readability

encoding/xml: (*Decoder).nsname now strictly parses namespaces

encoding/xml: disable 3/4 tests for golang#43168

I’m not sure what the right fix is for this. Malformed namespaces
(leading or trailing colons, more than 1 colon) should result in an error.

encoding/xml: allow callers to specify namespace prefix

A preferred namespace prefix can now be specified by setting the local
name space to "prefix:space".

In a struct tag:

struct Message {
    XMLName struct{} `xml:"urn:ietf:foo foo:message"`
    Value string `xml:"urn:ietf:foo foo:value"`
}

encoding/xml: use tag prefixes if previously defined

Instead of having redundant xmlns= attrs.

encoding/xml: rename (*printer).popPrefix to popPrefixes

since it pops 1 or more prefixes

encoding/xml: rename printer struct fields

To reflect the fact that prefixes apply to tag names, not just attrs.

encoding/xml: url->uri; reorg comments

encoding/xml: fix comments

encoding/xml: elide redundant xmlns= attrs for default namespace (no prefix)

encoding/xml: move namespace prefix tests

encoding/xml: handle namespace prefixes at the root element

encoding/xml: handle namespaced prefixed attr names

encoding/xml: split out prefixes during reflection, not parsing

encoding/xml: rename tagName to xmlTag; document it

encoding/xml: separate printing xmlns:prefix= attr from creating prefix

encoding/xml: clean up comments

encoding/xml: don’t use xmlTag in attr serialization

encoding/xml: test nested prefixed namespaced tags

encoding/xml: add test for prefixed XML tags without xmlns

encoding/xml: update doc comments

encoding/xml: update comments

encoding/xml: preemptively declare and record all namespace prefixes

Immediate children of XML tags that share a namespace and prefix will now
have that namespace prefix declared on the parent tag.

Explicitly declared namespace prefixes via xmlns:prefix="uri" attributes
will now have their values recorded and reused for marshalling child tags.

This commit reorganizes how namespace prefixes are recorded and detected,
along with how start tags are recorded via a slice of element structs.

Some tests are changed, because the value of the marshalled XML has changed,
but the resulting XML should be equivalent (and correct).

encoding/xml: restore tests with xmlns:prefix= attrs to existing behavior

Use xmlnsURL instead of xmlnsPrefix to specify namespace prefixes.

encoding/xml: prefer unprefixed names where possible

encoding/xml: add EncodeToken tests for explicit prefixes

encoding/xml: add test cases for prefixed local names

encoding/xml: revert change in 8f143f5277; do not preemptively declare XML namespaces

encoding/xml: fix typo in test
ydnar added a commit to ydnar/go that referenced this issue Jun 1, 2023
All issues of golang#13400 which are not new functionalities have fixes.
There are minor incompatibilities between them due to the handling of
prefixes. Duplicating a prefix or an namespace is invalid XML.
This is now avoided. XML produced is always valid.

Tests have been added for each fix and example and previous tests
fixed as output is already more compact is some cases.

encoding/xml: fix duplication of namespace tags by encoder (golang#7535)

A tag prefix identifies the name space of the tag and not the default name
space like xmlns="...". Writing the prefix is incorrect when it is bound
to a name space using the standard xmlns:prefix="..." attribute.
This fix skips this print.

Consequences are
 - duplication is avoided in line with name space standard in reference.
 - the _xmlns declaration does not appear anymore. To keep the previous
behaviour, the prefix is printed in all other cases. Token now always
produces well-formed XML except when the explicit name space collides
with the prefix.

Made prefix handling "xmlns="space" xmlns:_xmlns="xmlns" _..." has
be removed in all wants of tests. In some cases, useless declarations like
xmlns:x="x" are still added in line with previous behavior.

encoding/xml: fix unexpected behavior of encoder.Indent("", "") (golang#13185, golang#11431)

MarshalIndent and Marshal share code. When prefix and indent are
empty, the behavior is like Marshal when it should have a minimal
indent, i.e. new line as in documentation.

A boolean is added to the local printer struct which defaults to false.
It is set to true only when MarshalIndent is used and prefix and indent
are empty.

encoding/xml: fix overriding by empty namespace (golang#7113)

The namespace defined by xmlns="value" can be overridden in
every included tag including by the empty namespace xmlns="".
Empty namespace is not authorized with a prefix (xmlns:ns="").

Method to calculate indent of XML handles depth of tag and
its associated namespace. The fix leaves the method active even
when no indent is required.

An XMLName field in a struct means that namespace must be
enforced even if empty. This occurs only on an inner tag as an
overwrite of any non-empty namespace of its outer tag.

To obtain the xmlns="" required, an attribute is added.

encoding/xml: fix panic on embedded unexported XMLName (golang#10538)

By laws of reflection, unexported fields are unreachable by .Value.
XMLName are allowed at any level of an inner struct but the struct
may not be reachable. If XMLName field is found without name,
it cannot be exported and the value is discarded like other fields.
Some comments have been to underline where the issue arises.
Another XMLName test was incorrectly set up and is fixed.
Various cases added in a specific test.

encoding/xml: fix panic of unmarshaling of anonymous structs (golang#16497)

Encoding/xml is using type "typinfo" which provides its own "value" method
using the reflection package. It fails to check for the documented possible
panics of the reflection methods. It is impossible to fix the method as the
parameter is also using reflection.

The fix is to discard anonymous structs which have no value anyway.
Encoder/xml documentation already mentions that fields are accessed using
the reflection package. A relevant test is added.

encoding/xml: fix closing tag failure (golang#20685)

Push/pop of elements name must be done using the eventual prefix together
with the tag name. The operation is moved before the translation of prefix
into its URI. One end element of a test is fixed as expecting the last used
namespace is incorrect.
After closing a tag using a namespace, the valid namespace must be taken
from the opening tag.

encoding/xml: add check of namespaces to detect field names conflicts (golang#8535, golang#11724)

Comparing namespaces of fields was missing and false conflicts were detected.

encoding/xml: fix invalid empty namespace without prefix (golang#8068)

Empty namespace is allowed only if it has no prefix. An error message is now
returned if a prefix exists. A similar case when no prefix is provided,
thus with syntax xmlns:="..." is also rejected.

encoding/xml: fix normalization of attributes values (golang#20614)

The attribute value was read as text. The existing attribute reader logic is
fixed as an attribute may have a namespace or only a prefix. Other
possibilities have been removed.

To keep the behavior of raw token which allows many faults in attributes list,
error handling is heavily using the Strict parameter of the decoder.
Specific tests have been added including list of attributes.

To keep the behavior or unmarshal, escaped characters handling has been
added but it is not symmetrical to Marshal for quotes but follows XML
specification.

encoding/xml: fix absence of detection of another : in qualified names (golang#20396)

The occurrence of second : in space and tag name is rejected.

Fixes: golang#7113, golang#7535, golang#8068, golang#8535, golang#10538, golang#11431, golang#13185, golang#16497, golang#20396, golang#20614, golang#20685

Change-Id: Ib4a60347a47d23ff59b63307cebb83b71c7c9165

Commit originally authored by: Constantin Konstantinidis <constantinkonstantinidis@gmail.com>

encoding/xml: fix printing of namespace prefix in tag names

Prefix displays in XML when defined in tag names.
The URL of the name space is also returned for an End Token as
documentation requires to improve idempotency of Marshal/Unmarshal.

Translating the prefix is popping the NS which was unavailable
for translation. Translate for an End Token has been moved inside
the pop element part.

Fixes golang#9519

Change-Id: Id7a14d07c106a76a487b5c4e28d9d563fe061c60

encoding/xml: restore changes lost in merge

See golang#43168.

encoding/xml: gofmt

encoding/xml: minimalIndent -> minIndent to shrink diff

encoding/xml: gofmt

encoding/xml: revert changes to (*Decoder).attrval from master

encoding/xml: restore (*printer).writeIndent to master

encoding/xml: remove comments that don’t change functionality of tests

encoding/xml: use t.Errorf instead of fmt.Errorf

encoding/xml: fix test case for golang#11496

encoding/xml: revert unrelated change in (*Decoder).readName

encoding/xml: remove comments

encoding/xml: remove comments

encoding/xml: edit comments

encoding/xml: add test to ensure '@' is legal in an attr val

encoding/xml: improve test error quoting for readability

encoding/xml: (*Decoder).nsname now strictly parses namespaces

encoding/xml: disable 3/4 tests for golang#43168

I’m not sure what the right fix is for this. Malformed namespaces
(leading or trailing colons, more than 1 colon) should result in an error.

encoding/xml: allow callers to specify namespace prefix

A preferred namespace prefix can now be specified by setting the local
name space to "prefix:space".

In a struct tag:

struct Message {
    XMLName struct{} `xml:"urn:ietf:foo foo:message"`
    Value string `xml:"urn:ietf:foo foo:value"`
}

encoding/xml: use tag prefixes if previously defined

Instead of having redundant xmlns= attrs.

encoding/xml: rename (*printer).popPrefix to popPrefixes

since it pops 1 or more prefixes

encoding/xml: rename printer struct fields

To reflect the fact that prefixes apply to tag names, not just attrs.

encoding/xml: url->uri; reorg comments

encoding/xml: fix comments

encoding/xml: elide redundant xmlns= attrs for default namespace (no prefix)

encoding/xml: move namespace prefix tests

encoding/xml: handle namespace prefixes at the root element

encoding/xml: handle namespaced prefixed attr names

encoding/xml: split out prefixes during reflection, not parsing

encoding/xml: rename tagName to xmlTag; document it

encoding/xml: separate printing xmlns:prefix= attr from creating prefix

encoding/xml: clean up comments

encoding/xml: don’t use xmlTag in attr serialization

encoding/xml: test nested prefixed namespaced tags

encoding/xml: add test for prefixed XML tags without xmlns

encoding/xml: update doc comments

encoding/xml: update comments

encoding/xml: preemptively declare and record all namespace prefixes

Immediate children of XML tags that share a namespace and prefix will now
have that namespace prefix declared on the parent tag.

Explicitly declared namespace prefixes via xmlns:prefix="uri" attributes
will now have their values recorded and reused for marshalling child tags.

This commit reorganizes how namespace prefixes are recorded and detected,
along with how start tags are recorded via a slice of element structs.

Some tests are changed, because the value of the marshalled XML has changed,
but the resulting XML should be equivalent (and correct).

encoding/xml: restore tests with xmlns:prefix= attrs to existing behavior

Use xmlnsURL instead of xmlnsPrefix to specify namespace prefixes.

encoding/xml: prefer unprefixed names where possible

encoding/xml: add EncodeToken tests for explicit prefixes

encoding/xml: add test cases for prefixed local names

encoding/xml: revert change in 8f143f5277; do not preemptively declare XML namespaces

encoding/xml: fix typo in test
ydnar added a commit to ydnar/go that referenced this issue Jul 7, 2023
All issues of golang#13400 which are not new functionalities have fixes.
There are minor incompatibilities between them due to the handling of
prefixes. Duplicating a prefix or an namespace is invalid XML.
This is now avoided. XML produced is always valid.

Tests have been added for each fix and example and previous tests
fixed as output is already more compact is some cases.

encoding/xml: fix duplication of namespace tags by encoder (golang#7535)

A tag prefix identifies the name space of the tag and not the default name
space like xmlns="...". Writing the prefix is incorrect when it is bound
to a name space using the standard xmlns:prefix="..." attribute.
This fix skips this print.

Consequences are
 - duplication is avoided in line with name space standard in reference.
 - the _xmlns declaration does not appear anymore. To keep the previous
behaviour, the prefix is printed in all other cases. Token now always
produces well-formed XML except when the explicit name space collides
with the prefix.

Made prefix handling "xmlns="space" xmlns:_xmlns="xmlns" _..." has
be removed in all wants of tests. In some cases, useless declarations like
xmlns:x="x" are still added in line with previous behavior.

encoding/xml: fix unexpected behavior of encoder.Indent("", "") (golang#13185, golang#11431)

MarshalIndent and Marshal share code. When prefix and indent are
empty, the behavior is like Marshal when it should have a minimal
indent, i.e. new line as in documentation.

A boolean is added to the local printer struct which defaults to false.
It is set to true only when MarshalIndent is used and prefix and indent
are empty.

encoding/xml: fix overriding by empty namespace (golang#7113)

The namespace defined by xmlns="value" can be overridden in
every included tag including by the empty namespace xmlns="".
Empty namespace is not authorized with a prefix (xmlns:ns="").

Method to calculate indent of XML handles depth of tag and
its associated namespace. The fix leaves the method active even
when no indent is required.

An XMLName field in a struct means that namespace must be
enforced even if empty. This occurs only on an inner tag as an
overwrite of any non-empty namespace of its outer tag.

To obtain the xmlns="" required, an attribute is added.

encoding/xml: fix panic on embedded unexported XMLName (golang#10538)

By laws of reflection, unexported fields are unreachable by .Value.
XMLName are allowed at any level of an inner struct but the struct
may not be reachable. If XMLName field is found without name,
it cannot be exported and the value is discarded like other fields.
Some comments have been to underline where the issue arises.
Another XMLName test was incorrectly set up and is fixed.
Various cases added in a specific test.

encoding/xml: fix panic of unmarshaling of anonymous structs (golang#16497)

Encoding/xml is using type "typinfo" which provides its own "value" method
using the reflection package. It fails to check for the documented possible
panics of the reflection methods. It is impossible to fix the method as the
parameter is also using reflection.

The fix is to discard anonymous structs which have no value anyway.
Encoder/xml documentation already mentions that fields are accessed using
the reflection package. A relevant test is added.

encoding/xml: fix closing tag failure (golang#20685)

Push/pop of elements name must be done using the eventual prefix together
with the tag name. The operation is moved before the translation of prefix
into its URI. One end element of a test is fixed as expecting the last used
namespace is incorrect.
After closing a tag using a namespace, the valid namespace must be taken
from the opening tag.

encoding/xml: add check of namespaces to detect field names conflicts (golang#8535, golang#11724)

Comparing namespaces of fields was missing and false conflicts were detected.

encoding/xml: fix invalid empty namespace without prefix (golang#8068)

Empty namespace is allowed only if it has no prefix. An error message is now
returned if a prefix exists. A similar case when no prefix is provided,
thus with syntax xmlns:="..." is also rejected.

encoding/xml: fix normalization of attributes values (golang#20614)

The attribute value was read as text. The existing attribute reader logic is
fixed as an attribute may have a namespace or only a prefix. Other
possibilities have been removed.

To keep the behavior of raw token which allows many faults in attributes list,
error handling is heavily using the Strict parameter of the decoder.
Specific tests have been added including list of attributes.

To keep the behavior or unmarshal, escaped characters handling has been
added but it is not symmetrical to Marshal for quotes but follows XML
specification.

encoding/xml: fix absence of detection of another : in qualified names (golang#20396)

The occurrence of second : in space and tag name is rejected.

Fixes: golang#7113, golang#7535, golang#8068, golang#8535, golang#10538, golang#11431, golang#13185, golang#16497, golang#20396, golang#20614, golang#20685

Change-Id: Ib4a60347a47d23ff59b63307cebb83b71c7c9165

Commit originally authored by: Constantin Konstantinidis <constantinkonstantinidis@gmail.com>

encoding/xml: fix printing of namespace prefix in tag names

Prefix displays in XML when defined in tag names.
The URL of the name space is also returned for an End Token as
documentation requires to improve idempotency of Marshal/Unmarshal.

Translating the prefix is popping the NS which was unavailable
for translation. Translate for an End Token has been moved inside
the pop element part.

Fixes golang#9519

Change-Id: Id7a14d07c106a76a487b5c4e28d9d563fe061c60

encoding/xml: restore changes lost in merge

See golang#43168.

encoding/xml: gofmt

encoding/xml: minimalIndent -> minIndent to shrink diff

encoding/xml: gofmt

encoding/xml: revert changes to (*Decoder).attrval from master

encoding/xml: restore (*printer).writeIndent to master

encoding/xml: remove comments that don’t change functionality of tests

encoding/xml: use t.Errorf instead of fmt.Errorf

encoding/xml: fix test case for golang#11496

encoding/xml: revert unrelated change in (*Decoder).readName

encoding/xml: remove comments

encoding/xml: remove comments

encoding/xml: edit comments

encoding/xml: add test to ensure '@' is legal in an attr val

encoding/xml: improve test error quoting for readability

encoding/xml: (*Decoder).nsname now strictly parses namespaces

encoding/xml: disable 3/4 tests for golang#43168

I’m not sure what the right fix is for this. Malformed namespaces
(leading or trailing colons, more than 1 colon) should result in an error.

encoding/xml: allow callers to specify namespace prefix

A preferred namespace prefix can now be specified by setting the local
name space to "prefix:space".

In a struct tag:

struct Message {
    XMLName struct{} `xml:"urn:ietf:foo foo:message"`
    Value string `xml:"urn:ietf:foo foo:value"`
}

encoding/xml: use tag prefixes if previously defined

Instead of having redundant xmlns= attrs.

encoding/xml: rename (*printer).popPrefix to popPrefixes

since it pops 1 or more prefixes

encoding/xml: rename printer struct fields

To reflect the fact that prefixes apply to tag names, not just attrs.

encoding/xml: url->uri; reorg comments

encoding/xml: fix comments

encoding/xml: elide redundant xmlns= attrs for default namespace (no prefix)

encoding/xml: move namespace prefix tests

encoding/xml: handle namespace prefixes at the root element

encoding/xml: handle namespaced prefixed attr names

encoding/xml: split out prefixes during reflection, not parsing

encoding/xml: rename tagName to xmlTag; document it

encoding/xml: separate printing xmlns:prefix= attr from creating prefix

encoding/xml: clean up comments

encoding/xml: don’t use xmlTag in attr serialization

encoding/xml: test nested prefixed namespaced tags

encoding/xml: add test for prefixed XML tags without xmlns

encoding/xml: update doc comments

encoding/xml: update comments

encoding/xml: preemptively declare and record all namespace prefixes

Immediate children of XML tags that share a namespace and prefix will now
have that namespace prefix declared on the parent tag.

Explicitly declared namespace prefixes via xmlns:prefix="uri" attributes
will now have their values recorded and reused for marshalling child tags.

This commit reorganizes how namespace prefixes are recorded and detected,
along with how start tags are recorded via a slice of element structs.

Some tests are changed, because the value of the marshalled XML has changed,
but the resulting XML should be equivalent (and correct).

encoding/xml: restore tests with xmlns:prefix= attrs to existing behavior

Use xmlnsURL instead of xmlnsPrefix to specify namespace prefixes.

encoding/xml: prefer unprefixed names where possible

encoding/xml: add EncodeToken tests for explicit prefixes

encoding/xml: add test cases for prefixed local names

encoding/xml: revert change in 8f143f5277; do not preemptively declare XML namespaces

encoding/xml: fix typo in test
ydnar added a commit to ydnar/go that referenced this issue Aug 4, 2023
All issues of golang#13400 which are not new functionalities have fixes.
There are minor incompatibilities between them due to the handling of
prefixes. Duplicating a prefix or an namespace is invalid XML.
This is now avoided. XML produced is always valid.

Tests have been added for each fix and example and previous tests
fixed as output is already more compact is some cases.

encoding/xml: fix duplication of namespace tags by encoder (golang#7535)

A tag prefix identifies the name space of the tag and not the default name
space like xmlns="...". Writing the prefix is incorrect when it is bound
to a name space using the standard xmlns:prefix="..." attribute.
This fix skips this print.

Consequences are
 - duplication is avoided in line with name space standard in reference.
 - the _xmlns declaration does not appear anymore. To keep the previous
behaviour, the prefix is printed in all other cases. Token now always
produces well-formed XML except when the explicit name space collides
with the prefix.

Made prefix handling "xmlns="space" xmlns:_xmlns="xmlns" _..." has
be removed in all wants of tests. In some cases, useless declarations like
xmlns:x="x" are still added in line with previous behavior.

encoding/xml: fix unexpected behavior of encoder.Indent("", "") (golang#13185, golang#11431)

MarshalIndent and Marshal share code. When prefix and indent are
empty, the behavior is like Marshal when it should have a minimal
indent, i.e. new line as in documentation.

A boolean is added to the local printer struct which defaults to false.
It is set to true only when MarshalIndent is used and prefix and indent
are empty.

encoding/xml: fix overriding by empty namespace (golang#7113)

The namespace defined by xmlns="value" can be overridden in
every included tag including by the empty namespace xmlns="".
Empty namespace is not authorized with a prefix (xmlns:ns="").

Method to calculate indent of XML handles depth of tag and
its associated namespace. The fix leaves the method active even
when no indent is required.

An XMLName field in a struct means that namespace must be
enforced even if empty. This occurs only on an inner tag as an
overwrite of any non-empty namespace of its outer tag.

To obtain the xmlns="" required, an attribute is added.

encoding/xml: fix panic on embedded unexported XMLName (golang#10538)

By laws of reflection, unexported fields are unreachable by .Value.
XMLName are allowed at any level of an inner struct but the struct
may not be reachable. If XMLName field is found without name,
it cannot be exported and the value is discarded like other fields.
Some comments have been to underline where the issue arises.
Another XMLName test was incorrectly set up and is fixed.
Various cases added in a specific test.

encoding/xml: fix panic of unmarshaling of anonymous structs (golang#16497)

Encoding/xml is using type "typinfo" which provides its own "value" method
using the reflection package. It fails to check for the documented possible
panics of the reflection methods. It is impossible to fix the method as the
parameter is also using reflection.

The fix is to discard anonymous structs which have no value anyway.
Encoder/xml documentation already mentions that fields are accessed using
the reflection package. A relevant test is added.

encoding/xml: fix closing tag failure (golang#20685)

Push/pop of elements name must be done using the eventual prefix together
with the tag name. The operation is moved before the translation of prefix
into its URI. One end element of a test is fixed as expecting the last used
namespace is incorrect.
After closing a tag using a namespace, the valid namespace must be taken
from the opening tag.

encoding/xml: add check of namespaces to detect field names conflicts (golang#8535, golang#11724)

Comparing namespaces of fields was missing and false conflicts were detected.

encoding/xml: fix invalid empty namespace without prefix (golang#8068)

Empty namespace is allowed only if it has no prefix. An error message is now
returned if a prefix exists. A similar case when no prefix is provided,
thus with syntax xmlns:="..." is also rejected.

encoding/xml: fix normalization of attributes values (golang#20614)

The attribute value was read as text. The existing attribute reader logic is
fixed as an attribute may have a namespace or only a prefix. Other
possibilities have been removed.

To keep the behavior of raw token which allows many faults in attributes list,
error handling is heavily using the Strict parameter of the decoder.
Specific tests have been added including list of attributes.

To keep the behavior or unmarshal, escaped characters handling has been
added but it is not symmetrical to Marshal for quotes but follows XML
specification.

encoding/xml: fix absence of detection of another : in qualified names (golang#20396)

The occurrence of second : in space and tag name is rejected.

Fixes: golang#7113, golang#7535, golang#8068, golang#8535, golang#10538, golang#11431, golang#13185, golang#16497, golang#20396, golang#20614, golang#20685

Change-Id: Ib4a60347a47d23ff59b63307cebb83b71c7c9165

Commit originally authored by: Constantin Konstantinidis <constantinkonstantinidis@gmail.com>

encoding/xml: fix printing of namespace prefix in tag names

Prefix displays in XML when defined in tag names.
The URL of the name space is also returned for an End Token as
documentation requires to improve idempotency of Marshal/Unmarshal.

Translating the prefix is popping the NS which was unavailable
for translation. Translate for an End Token has been moved inside
the pop element part.

Fixes golang#9519

Change-Id: Id7a14d07c106a76a487b5c4e28d9d563fe061c60

encoding/xml: restore changes lost in merge

See golang#43168.

encoding/xml: gofmt

encoding/xml: minimalIndent -> minIndent to shrink diff

encoding/xml: gofmt

encoding/xml: revert changes to (*Decoder).attrval from master

encoding/xml: restore (*printer).writeIndent to master

encoding/xml: remove comments that don’t change functionality of tests

encoding/xml: use t.Errorf instead of fmt.Errorf

encoding/xml: fix test case for golang#11496

encoding/xml: revert unrelated change in (*Decoder).readName

encoding/xml: remove comments

encoding/xml: remove comments

encoding/xml: edit comments

encoding/xml: add test to ensure '@' is legal in an attr val

encoding/xml: improve test error quoting for readability

encoding/xml: (*Decoder).nsname now strictly parses namespaces

encoding/xml: disable 3/4 tests for golang#43168

I’m not sure what the right fix is for this. Malformed namespaces
(leading or trailing colons, more than 1 colon) should result in an error.

encoding/xml: allow callers to specify namespace prefix

A preferred namespace prefix can now be specified by setting the local
name space to "prefix:space".

In a struct tag:

struct Message {
    XMLName struct{} `xml:"urn:ietf:foo foo:message"`
    Value string `xml:"urn:ietf:foo foo:value"`
}

encoding/xml: use tag prefixes if previously defined

Instead of having redundant xmlns= attrs.

encoding/xml: rename (*printer).popPrefix to popPrefixes

since it pops 1 or more prefixes

encoding/xml: rename printer struct fields

To reflect the fact that prefixes apply to tag names, not just attrs.

encoding/xml: url->uri; reorg comments

encoding/xml: fix comments

encoding/xml: elide redundant xmlns= attrs for default namespace (no prefix)

encoding/xml: move namespace prefix tests

encoding/xml: handle namespace prefixes at the root element

encoding/xml: handle namespaced prefixed attr names

encoding/xml: split out prefixes during reflection, not parsing

encoding/xml: rename tagName to xmlTag; document it

encoding/xml: separate printing xmlns:prefix= attr from creating prefix

encoding/xml: clean up comments

encoding/xml: don’t use xmlTag in attr serialization

encoding/xml: test nested prefixed namespaced tags

encoding/xml: add test for prefixed XML tags without xmlns

encoding/xml: update doc comments

encoding/xml: update comments

encoding/xml: preemptively declare and record all namespace prefixes

Immediate children of XML tags that share a namespace and prefix will now
have that namespace prefix declared on the parent tag.

Explicitly declared namespace prefixes via xmlns:prefix="uri" attributes
will now have their values recorded and reused for marshalling child tags.

This commit reorganizes how namespace prefixes are recorded and detected,
along with how start tags are recorded via a slice of element structs.

Some tests are changed, because the value of the marshalled XML has changed,
but the resulting XML should be equivalent (and correct).

encoding/xml: restore tests with xmlns:prefix= attrs to existing behavior

Use xmlnsURL instead of xmlnsPrefix to specify namespace prefixes.

encoding/xml: prefer unprefixed names where possible

encoding/xml: add EncodeToken tests for explicit prefixes

encoding/xml: add test cases for prefixed local names

encoding/xml: revert change in 8f143f5277; do not preemptively declare XML namespaces

encoding/xml: fix typo in test
ydnar added a commit to ydnar/go that referenced this issue Aug 14, 2023
All issues of golang#13400 which are not new functionalities have fixes.
There are minor incompatibilities between them due to the handling of
prefixes. Duplicating a prefix or an namespace is invalid XML.
This is now avoided. XML produced is always valid.

Tests have been added for each fix and example and previous tests
fixed as output is already more compact is some cases.

encoding/xml: fix duplication of namespace tags by encoder (golang#7535)

A tag prefix identifies the name space of the tag and not the default name
space like xmlns="...". Writing the prefix is incorrect when it is bound
to a name space using the standard xmlns:prefix="..." attribute.
This fix skips this print.

Consequences are
 - duplication is avoided in line with name space standard in reference.
 - the _xmlns declaration does not appear anymore. To keep the previous
behaviour, the prefix is printed in all other cases. Token now always
produces well-formed XML except when the explicit name space collides
with the prefix.

Made prefix handling "xmlns="space" xmlns:_xmlns="xmlns" _..." has
be removed in all wants of tests. In some cases, useless declarations like
xmlns:x="x" are still added in line with previous behavior.

encoding/xml: fix unexpected behavior of encoder.Indent("", "") (golang#13185, golang#11431)

MarshalIndent and Marshal share code. When prefix and indent are
empty, the behavior is like Marshal when it should have a minimal
indent, i.e. new line as in documentation.

A boolean is added to the local printer struct which defaults to false.
It is set to true only when MarshalIndent is used and prefix and indent
are empty.

encoding/xml: fix overriding by empty namespace (golang#7113)

The namespace defined by xmlns="value" can be overridden in
every included tag including by the empty namespace xmlns="".
Empty namespace is not authorized with a prefix (xmlns:ns="").

Method to calculate indent of XML handles depth of tag and
its associated namespace. The fix leaves the method active even
when no indent is required.

An XMLName field in a struct means that namespace must be
enforced even if empty. This occurs only on an inner tag as an
overwrite of any non-empty namespace of its outer tag.

To obtain the xmlns="" required, an attribute is added.

encoding/xml: fix panic on embedded unexported XMLName (golang#10538)

By laws of reflection, unexported fields are unreachable by .Value.
XMLName are allowed at any level of an inner struct but the struct
may not be reachable. If XMLName field is found without name,
it cannot be exported and the value is discarded like other fields.
Some comments have been to underline where the issue arises.
Another XMLName test was incorrectly set up and is fixed.
Various cases added in a specific test.

encoding/xml: fix panic of unmarshaling of anonymous structs (golang#16497)

Encoding/xml is using type "typinfo" which provides its own "value" method
using the reflection package. It fails to check for the documented possible
panics of the reflection methods. It is impossible to fix the method as the
parameter is also using reflection.

The fix is to discard anonymous structs which have no value anyway.
Encoder/xml documentation already mentions that fields are accessed using
the reflection package. A relevant test is added.

encoding/xml: fix closing tag failure (golang#20685)

Push/pop of elements name must be done using the eventual prefix together
with the tag name. The operation is moved before the translation of prefix
into its URI. One end element of a test is fixed as expecting the last used
namespace is incorrect.
After closing a tag using a namespace, the valid namespace must be taken
from the opening tag.

encoding/xml: add check of namespaces to detect field names conflicts (golang#8535, golang#11724)

Comparing namespaces of fields was missing and false conflicts were detected.

encoding/xml: fix invalid empty namespace without prefix (golang#8068)

Empty namespace is allowed only if it has no prefix. An error message is now
returned if a prefix exists. A similar case when no prefix is provided,
thus with syntax xmlns:="..." is also rejected.

encoding/xml: fix normalization of attributes values (golang#20614)

The attribute value was read as text. The existing attribute reader logic is
fixed as an attribute may have a namespace or only a prefix. Other
possibilities have been removed.

To keep the behavior of raw token which allows many faults in attributes list,
error handling is heavily using the Strict parameter of the decoder.
Specific tests have been added including list of attributes.

To keep the behavior or unmarshal, escaped characters handling has been
added but it is not symmetrical to Marshal for quotes but follows XML
specification.

encoding/xml: fix absence of detection of another : in qualified names (golang#20396)

The occurrence of second : in space and tag name is rejected.

Fixes: golang#7113, golang#7535, golang#8068, golang#8535, golang#10538, golang#11431, golang#13185, golang#16497, golang#20396, golang#20614, golang#20685

Change-Id: Ib4a60347a47d23ff59b63307cebb83b71c7c9165

Commit originally authored by: Constantin Konstantinidis <constantinkonstantinidis@gmail.com>

encoding/xml: fix printing of namespace prefix in tag names

Prefix displays in XML when defined in tag names.
The URL of the name space is also returned for an End Token as
documentation requires to improve idempotency of Marshal/Unmarshal.

Translating the prefix is popping the NS which was unavailable
for translation. Translate for an End Token has been moved inside
the pop element part.

Fixes golang#9519

Change-Id: Id7a14d07c106a76a487b5c4e28d9d563fe061c60

encoding/xml: restore changes lost in merge

See golang#43168.

encoding/xml: gofmt

encoding/xml: minimalIndent -> minIndent to shrink diff

encoding/xml: gofmt

encoding/xml: revert changes to (*Decoder).attrval from master

encoding/xml: restore (*printer).writeIndent to master

encoding/xml: remove comments that don’t change functionality of tests

encoding/xml: use t.Errorf instead of fmt.Errorf

encoding/xml: fix test case for golang#11496

encoding/xml: revert unrelated change in (*Decoder).readName

encoding/xml: remove comments

encoding/xml: remove comments

encoding/xml: edit comments

encoding/xml: add test to ensure '@' is legal in an attr val

encoding/xml: improve test error quoting for readability

encoding/xml: (*Decoder).nsname now strictly parses namespaces

encoding/xml: disable 3/4 tests for golang#43168

I’m not sure what the right fix is for this. Malformed namespaces
(leading or trailing colons, more than 1 colon) should result in an error.

encoding/xml: allow callers to specify namespace prefix

A preferred namespace prefix can now be specified by setting the local
name space to "prefix:space".

In a struct tag:

struct Message {
    XMLName struct{} `xml:"urn:ietf:foo foo:message"`
    Value string `xml:"urn:ietf:foo foo:value"`
}

encoding/xml: use tag prefixes if previously defined

Instead of having redundant xmlns= attrs.

encoding/xml: rename (*printer).popPrefix to popPrefixes

since it pops 1 or more prefixes

encoding/xml: rename printer struct fields

To reflect the fact that prefixes apply to tag names, not just attrs.

encoding/xml: url->uri; reorg comments

encoding/xml: fix comments

encoding/xml: elide redundant xmlns= attrs for default namespace (no prefix)

encoding/xml: move namespace prefix tests

encoding/xml: handle namespace prefixes at the root element

encoding/xml: handle namespaced prefixed attr names

encoding/xml: split out prefixes during reflection, not parsing

encoding/xml: rename tagName to xmlTag; document it

encoding/xml: separate printing xmlns:prefix= attr from creating prefix

encoding/xml: clean up comments

encoding/xml: don’t use xmlTag in attr serialization

encoding/xml: test nested prefixed namespaced tags

encoding/xml: add test for prefixed XML tags without xmlns

encoding/xml: update doc comments

encoding/xml: update comments

encoding/xml: preemptively declare and record all namespace prefixes

Immediate children of XML tags that share a namespace and prefix will now
have that namespace prefix declared on the parent tag.

Explicitly declared namespace prefixes via xmlns:prefix="uri" attributes
will now have their values recorded and reused for marshalling child tags.

This commit reorganizes how namespace prefixes are recorded and detected,
along with how start tags are recorded via a slice of element structs.

Some tests are changed, because the value of the marshalled XML has changed,
but the resulting XML should be equivalent (and correct).

encoding/xml: restore tests with xmlns:prefix= attrs to existing behavior

Use xmlnsURL instead of xmlnsPrefix to specify namespace prefixes.

encoding/xml: prefer unprefixed names where possible

encoding/xml: add EncodeToken tests for explicit prefixes

encoding/xml: add test cases for prefixed local names

encoding/xml: revert change in 8f143f5277; do not preemptively declare XML namespaces

encoding/xml: fix typo in test
ydnar added a commit to ydnar/go that referenced this issue Aug 24, 2023
All issues of golang#13400 which are not new functionalities have fixes.
There are minor incompatibilities between them due to the handling of
prefixes. Duplicating a prefix or an namespace is invalid XML.
This is now avoided. XML produced is always valid.

Tests have been added for each fix and example and previous tests
fixed as output is already more compact is some cases.

encoding/xml: fix duplication of namespace tags by encoder (golang#7535)

A tag prefix identifies the name space of the tag and not the default name
space like xmlns="...". Writing the prefix is incorrect when it is bound
to a name space using the standard xmlns:prefix="..." attribute.
This fix skips this print.

Consequences are
 - duplication is avoided in line with name space standard in reference.
 - the _xmlns declaration does not appear anymore. To keep the previous
behaviour, the prefix is printed in all other cases. Token now always
produces well-formed XML except when the explicit name space collides
with the prefix.

Made prefix handling "xmlns="space" xmlns:_xmlns="xmlns" _..." has
be removed in all wants of tests. In some cases, useless declarations like
xmlns:x="x" are still added in line with previous behavior.

encoding/xml: fix unexpected behavior of encoder.Indent("", "") (golang#13185, golang#11431)

MarshalIndent and Marshal share code. When prefix and indent are
empty, the behavior is like Marshal when it should have a minimal
indent, i.e. new line as in documentation.

A boolean is added to the local printer struct which defaults to false.
It is set to true only when MarshalIndent is used and prefix and indent
are empty.

encoding/xml: fix overriding by empty namespace (golang#7113)

The namespace defined by xmlns="value" can be overridden in
every included tag including by the empty namespace xmlns="".
Empty namespace is not authorized with a prefix (xmlns:ns="").

Method to calculate indent of XML handles depth of tag and
its associated namespace. The fix leaves the method active even
when no indent is required.

An XMLName field in a struct means that namespace must be
enforced even if empty. This occurs only on an inner tag as an
overwrite of any non-empty namespace of its outer tag.

To obtain the xmlns="" required, an attribute is added.

encoding/xml: fix panic on embedded unexported XMLName (golang#10538)

By laws of reflection, unexported fields are unreachable by .Value.
XMLName are allowed at any level of an inner struct but the struct
may not be reachable. If XMLName field is found without name,
it cannot be exported and the value is discarded like other fields.
Some comments have been to underline where the issue arises.
Another XMLName test was incorrectly set up and is fixed.
Various cases added in a specific test.

encoding/xml: fix panic of unmarshaling of anonymous structs (golang#16497)

Encoding/xml is using type "typinfo" which provides its own "value" method
using the reflection package. It fails to check for the documented possible
panics of the reflection methods. It is impossible to fix the method as the
parameter is also using reflection.

The fix is to discard anonymous structs which have no value anyway.
Encoder/xml documentation already mentions that fields are accessed using
the reflection package. A relevant test is added.

encoding/xml: fix closing tag failure (golang#20685)

Push/pop of elements name must be done using the eventual prefix together
with the tag name. The operation is moved before the translation of prefix
into its URI. One end element of a test is fixed as expecting the last used
namespace is incorrect.
After closing a tag using a namespace, the valid namespace must be taken
from the opening tag.

encoding/xml: add check of namespaces to detect field names conflicts (golang#8535, golang#11724)

Comparing namespaces of fields was missing and false conflicts were detected.

encoding/xml: fix invalid empty namespace without prefix (golang#8068)

Empty namespace is allowed only if it has no prefix. An error me