Permalink
Switch branches/tags
weekly.2012-03-27 weekly.2012-03-22 weekly.2012-03-13 weekly.2012-03-04 weekly.2012-02-22 weekly.2012-02-14 weekly.2012-02-07 weekly.2012-01-27 weekly.2012-01-20 weekly.2012-01-15 weekly.2011-12-22 weekly.2011-12-14 weekly.2011-12-06 weekly.2011-12-02 weekly.2011-12-01 weekly.2011-11-18 weekly.2011-11-09 weekly.2011-11-08 weekly.2011-11-02 weekly.2011-11-01 weekly.2011-10-26 weekly.2011-10-25 weekly.2011-10-18 weekly.2011-10-06 weekly.2011-09-21 weekly.2011-09-16 weekly.2011-09-07 weekly.2011-09-01 weekly.2011-08-17 weekly.2011-08-10 weekly.2011-07-29 weekly.2011-07-19 weekly.2011-07-07 weekly.2011-06-23 weekly.2011-06-16 weekly.2011-06-09 weekly.2011-06-02 weekly.2011-05-22 weekly.2011-04-27 weekly.2011-04-13 weekly.2011-04-04 weekly.2011-03-28 weekly.2011-03-15 weekly.2011-03-07.1 weekly.2011-03-07 weekly.2011-02-24 weekly.2011-02-15 weekly.2011-02-01.1 weekly.2011-02-01 weekly.2011-01-20 weekly.2011-01-19 weekly.2011-01-12 weekly.2011-01-06 weekly.2010-12-22 weekly.2010-12-15.1 weekly.2010-12-15 weekly.2010-12-08 weekly.2010-12-02 weekly.2010-11-23 weekly.2010-11-10 weekly.2010-11-02 weekly.2010-10-27 weekly.2010-10-20 weekly.2010-10-13.1 weekly.2010-10-13 weekly.2010-09-29 weekly.2010-09-22 weekly.2010-09-15 weekly.2010-09-06 weekly.2010-08-25 weekly.2010-08-11 weekly.2010-08-04 weekly.2010-07-29 weekly.2010-07-14 weekly.2010-07-01 weekly.2010-06-21 weekly.2010-06-09 weekly.2010-05-27 weekly.2010-05-04 weekly.2010-04-27 weekly.2010-04-13 weekly.2010-03-30 weekly.2010-03-22 weekly.2010-03-15 weekly.2010-03-04 weekly.2010-02-23 weekly.2010-02-17 weekly.2010-02-04 weekly.2010-01-27 weekly.2010-01-13 weekly.2010-01-05 weekly.2009-12-22 weekly.2009-12-09 weekly.2009-12-07 weekly.2009-11-17 weekly.2009-11-12 weekly.2009-11-10.1 weekly.2009-11-10 weekly.2009-11-06 weekly
Nothing to show
Find file Copy path
261 lines (246 sloc) 7.21 KB
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package template
import (
"bytes"
"fmt"
"strings"
"unicode/utf8"
)
// htmlNospaceEscaper escapes for inclusion in unquoted attribute values.
func htmlNospaceEscaper(args ...interface{}) string {
s, t := stringify(args...)
if t == contentTypeHTML {
return htmlReplacer(stripTags(s), htmlNospaceNormReplacementTable, false)
}
return htmlReplacer(s, htmlNospaceReplacementTable, false)
}
// attrEscaper escapes for inclusion in quoted attribute values.
func attrEscaper(args ...interface{}) string {
s, t := stringify(args...)
if t == contentTypeHTML {
return htmlReplacer(stripTags(s), htmlNormReplacementTable, true)
}
return htmlReplacer(s, htmlReplacementTable, true)
}
// rcdataEscaper escapes for inclusion in an RCDATA element body.
func rcdataEscaper(args ...interface{}) string {
s, t := stringify(args...)
if t == contentTypeHTML {
return htmlReplacer(s, htmlNormReplacementTable, true)
}
return htmlReplacer(s, htmlReplacementTable, true)
}
// htmlEscaper escapes for inclusion in HTML text.
func htmlEscaper(args ...interface{}) string {
s, t := stringify(args...)
if t == contentTypeHTML {
return s
}
return htmlReplacer(s, htmlReplacementTable, true)
}
// htmlReplacementTable contains the runes that need to be escaped
// inside a quoted attribute value or in a text node.
var htmlReplacementTable = []string{
// https://www.w3.org/TR/html5/syntax.html#attribute-value-(unquoted)-state
// U+0000 NULL Parse error. Append a U+FFFD REPLACEMENT
// CHARACTER character to the current attribute's value.
// "
// and similarly
// https://www.w3.org/TR/html5/syntax.html#before-attribute-value-state
0: "\uFFFD",
'"': """,
'&': "&",
'\'': "'",
'+': "+",
'<': "&lt;",
'>': "&gt;",
}
// htmlNormReplacementTable is like htmlReplacementTable but without '&' to
// avoid over-encoding existing entities.
var htmlNormReplacementTable = []string{
0: "\uFFFD",
'"': "&#34;",
'\'': "&#39;",
'+': "&#43;",
'<': "&lt;",
'>': "&gt;",
}
// htmlNospaceReplacementTable contains the runes that need to be escaped
// inside an unquoted attribute value.
// The set of runes escaped is the union of the HTML specials and
// those determined by running the JS below in browsers:
// <div id=d></div>
// <script>(function () {
// var a = [], d = document.getElementById("d"), i, c, s;
// for (i = 0; i < 0x10000; ++i) {
// c = String.fromCharCode(i);
// d.innerHTML = "<span title=" + c + "lt" + c + "></span>"
// s = d.getElementsByTagName("SPAN")[0];
// if (!s || s.title !== c + "lt" + c) { a.push(i.toString(16)); }
// }
// document.write(a.join(", "));
// })()</script>
var htmlNospaceReplacementTable = []string{
0: "&#xfffd;",
'\t': "&#9;",
'\n': "&#10;",
'\v': "&#11;",
'\f': "&#12;",
'\r': "&#13;",
' ': "&#32;",
'"': "&#34;",
'&': "&amp;",
'\'': "&#39;",
'+': "&#43;",
'<': "&lt;",
'=': "&#61;",
'>': "&gt;",
// A parse error in the attribute value (unquoted) and
// before attribute value states.
// Treated as a quoting character by IE.
'`': "&#96;",
}
// htmlNospaceNormReplacementTable is like htmlNospaceReplacementTable but
// without '&' to avoid over-encoding existing entities.
var htmlNospaceNormReplacementTable = []string{
0: "&#xfffd;",
'\t': "&#9;",
'\n': "&#10;",
'\v': "&#11;",
'\f': "&#12;",
'\r': "&#13;",
' ': "&#32;",
'"': "&#34;",
'\'': "&#39;",
'+': "&#43;",
'<': "&lt;",
'=': "&#61;",
'>': "&gt;",
// A parse error in the attribute value (unquoted) and
// before attribute value states.
// Treated as a quoting character by IE.
'`': "&#96;",
}
// htmlReplacer returns s with runes replaced according to replacementTable
// and when badRunes is true, certain bad runes are allowed through unescaped.
func htmlReplacer(s string, replacementTable []string, badRunes bool) string {
written, b := 0, new(bytes.Buffer)
r, w := rune(0), 0
for i := 0; i < len(s); i += w {
// Cannot use 'for range s' because we need to preserve the width
// of the runes in the input. If we see a decoding error, the input
// width will not be utf8.Runelen(r) and we will overrun the buffer.
r, w = utf8.DecodeRuneInString(s[i:])
if int(r) < len(replacementTable) {
if repl := replacementTable[r]; len(repl) != 0 {
b.WriteString(s[written:i])
b.WriteString(repl)
written = i + w
}
} else if badRunes {
// No-op.
// IE does not allow these ranges in unquoted attrs.
} else if 0xfdd0 <= r && r <= 0xfdef || 0xfff0 <= r && r <= 0xffff {
fmt.Fprintf(b, "%s&#x%x;", s[written:i], r)
written = i + w
}
}
if written == 0 {
return s
}
b.WriteString(s[written:])
return b.String()
}
// stripTags takes a snippet of HTML and returns only the text content.
// For example, `<b>&iexcl;Hi!</b> <script>...</script>` -> `&iexcl;Hi! `.
func stripTags(html string) string {
var b bytes.Buffer
s, c, i, allText := []byte(html), context{}, 0, true
// Using the transition funcs helps us avoid mangling
// `<div title="1>2">` or `I <3 Ponies!`.
for i != len(s) {
if c.delim == delimNone {
st := c.state
// Use RCDATA instead of parsing into JS or CSS styles.
if c.element != elementNone && !isInTag(st) {
st = stateRCDATA
}
d, nread := transitionFunc[st](c, s[i:])
i1 := i + nread
if c.state == stateText || c.state == stateRCDATA {
// Emit text up to the start of the tag or comment.
j := i1
if d.state != c.state {
for j1 := j - 1; j1 >= i; j1-- {
if s[j1] == '<' {
j = j1
break
}
}
}
b.Write(s[i:j])
} else {
allText = false
}
c, i = d, i1
continue
}
i1 := i + bytes.IndexAny(s[i:], delimEnds[c.delim])
if i1 < i {
break
}
if c.delim != delimSpaceOrTagEnd {
// Consume any quote.
i1++
}
c, i = context{state: stateTag, element: c.element}, i1
}
if allText {
return html
} else if c.state == stateText || c.state == stateRCDATA {
b.Write(s[i:])
}
return b.String()
}
// htmlNameFilter accepts valid parts of an HTML attribute or tag name or
// a known-safe HTML attribute.
func htmlNameFilter(args ...interface{}) string {
s, t := stringify(args...)
if t == contentTypeHTMLAttr {
return s
}
if len(s) == 0 {
// Avoid violation of structure preservation.
// <input checked {{.K}}={{.V}}>.
// Without this, if .K is empty then .V is the value of
// checked, but otherwise .V is the value of the attribute
// named .K.
return filterFailsafe
}
s = strings.ToLower(s)
if t := attrType(s); t != contentTypePlain {
// TODO: Split attr and element name part filters so we can whitelist
// attributes.
return filterFailsafe
}
for _, r := range s {
switch {
case '0' <= r && r <= '9':
case 'a' <= r && r <= 'z':
default:
return filterFailsafe
}
}
return s
}
// commentEscaper returns the empty string regardless of input.
// Comment content does not correspond to any parsed structure or
// human-readable content, so the simplest and most secure policy is to drop
// content interpolated into comments.
// This approach is equally valid whether or not static comment content is
// removed from the template.
func commentEscaper(args ...interface{}) string {
return ""
}