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tokenizer.py
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tokenizer.py
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from collections import deque
from .constants import contentModelFlags, spaceCharacters
from .constants import entitiesWindows1252, entities
from .constants import asciiLowercase, asciiLetters, asciiUpper2Lower
from .constants import digits, hexDigits, EOF
from .constants import tokenTypes
from .inputstream import HTMLInputStream
# Group entities by their first character, for faster lookups
entitiesByFirstChar = {}
for e in entities:
entitiesByFirstChar.setdefault(e[0], []).append(e)
class HTMLTokenizer:
""" This class takes care of tokenizing HTML.
* self.currentToken
Holds the token that is currently being processed.
* self.state
Holds a reference to the method to be invoked... XXX
* self.states
Holds a mapping between states and methods that implement the state.
* self.stream
Points to HTMLInputStream object.
"""
# XXX need to fix documentation
def __init__(self, stream, encoding=None, parseMeta=True, useChardet=True,
lowercaseElementName=True, lowercaseAttrName=True):
self.stream = HTMLInputStream(stream, encoding, parseMeta, useChardet)
#Perform case conversions?
self.lowercaseElementName = lowercaseElementName
self.lowercaseAttrName = lowercaseAttrName
self.states = {
"data":self.dataState,
"entityData":self.entityDataState,
"tagOpen":self.tagOpenState,
"closeTagOpen":self.closeTagOpenState,
"tagName":self.tagNameState,
"beforeAttributeName":self.beforeAttributeNameState,
"attributeName":self.attributeNameState,
"afterAttributeName":self.afterAttributeNameState,
"beforeAttributeValue":self.beforeAttributeValueState,
"attributeValueDoubleQuoted":self.attributeValueDoubleQuotedState,
"attributeValueSingleQuoted":self.attributeValueSingleQuotedState,
"attributeValueUnQuoted":self.attributeValueUnQuotedState,
"afterAttributeValue":self.afterAttributeValueState,
"selfClosingStartTag":self.selfClosingStartTagState,
"bogusComment":self.bogusCommentState,
"bogusCommentContinuation":self.bogusCommentContinuationState,
"markupDeclarationOpen":self.markupDeclarationOpenState,
"commentStart":self.commentStartState,
"commentStartDash":self.commentStartDashState,
"comment":self.commentState,
"commentEndDash":self.commentEndDashState,
"commentEnd":self.commentEndState,
"doctype":self.doctypeState,
"beforeDoctypeName":self.beforeDoctypeNameState,
"doctypeName":self.doctypeNameState,
"afterDoctypeName":self.afterDoctypeNameState,
"beforeDoctypePublicIdentifier":self.beforeDoctypePublicIdentifierState,
"doctypePublicIdentifierDoubleQuoted":self.doctypePublicIdentifierDoubleQuotedState,
"doctypePublicIdentifierSingleQuoted":self.doctypePublicIdentifierSingleQuotedState,
"afterDoctypePublicIdentifier":self.afterDoctypePublicIdentifierState,
"beforeDoctypeSystemIdentifier":self.beforeDoctypeSystemIdentifierState,
"doctypeSystemIdentifierDoubleQuoted":self.doctypeSystemIdentifierDoubleQuotedState,
"doctypeSystemIdentifierSingleQuoted":self.doctypeSystemIdentifierSingleQuotedState,
"afterDoctypeSystemIdentifier":self.afterDoctypeSystemIdentifierState,
"bogusDoctype":self.bogusDoctypeState
}
# Setup the initial tokenizer state
self.contentModelFlag = contentModelFlags["PCDATA"]
self.escapeFlag = False
self.lastFourChars = []
self.state = self.states["data"]
self.escape = False
# The current token being created
self.currentToken = None
def __iter__(self):
""" This is where the magic happens.
We do our usually processing through the states and when we have a token
to return we yield the token which pauses processing until the next token
is requested.
"""
self.tokenQueue = deque([])
# Start processing. When EOF is reached self.state will return False
# instead of True and the loop will terminate.
while self.state():
while self.stream.errors:
yield {"type": tokenTypes["ParseError"], "data": self.stream.errors.pop(0)}
while self.tokenQueue:
yield self.tokenQueue.popleft()
def consumeNumberEntity(self, isHex):
"""This function returns either U+FFFD or the character based on the
decimal or hexadecimal representation. It also discards ";" if present.
If not present self.tokenQueue.append({"type": tokenTypes["ParseError"]}) is invoked.
"""
allowed = digits
radix = 10
if isHex:
allowed = hexDigits
radix = 16
charStack = []
# Consume all the characters that are in range while making sure we
# don't hit an EOF.
c = self.stream.char()
while c in allowed and c is not EOF:
charStack.append(c)
c = self.stream.char()
# Convert the set of characters consumed to an int.
charAsInt = int("".join(charStack), radix)
if charAsInt == 13:
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"incorrect-cr-newline-entity"})
charAsInt = 10
elif 127 < charAsInt < 160:
# If the integer is between 127 and 160 (so 128 and bigger and 159
# and smaller) we need to do the "windows trick".
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"illegal-windows-1252-entity"})
charAsInt = entitiesWindows1252[charAsInt - 128]
# Certain characters get replaced with U+FFFD
if ((charAsInt <= 0x0008) or (charAsInt == 0x000B) or (0x000E <= charAsInt <= 0x001F)
or (0x007F <= charAsInt <= 0x009F)
or (0xD800 <= charAsInt <= 0xDFFF) or (0xFDD0 <= charAsInt <= 0xFDEF)
or (charAsInt & 0xFFFE == 0xFFFE) # catch all U+?FFFE and U+?FFFF, where ? is 0..10
or (0x10FFFF < charAsInt)):
char = "\uFFFD"
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"illegal-codepoint-for-numeric-entity",
"datavars": {"charAsInt": charAsInt}})
else:
try:
# XXX We should have a separate function that does "int" to
# "unicodestring" conversion since this doesn't always work
# according to hsivonen. Also, unichr has a limitation of 65535
char = chr(charAsInt)
except:
try:
char = eval("u'\\U%08x'" % charAsInt)
except:
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"cant-convert-numeric-entity",
"datavars": {"charAsInt": charAsInt}})
# Discard the ; if present. Otherwise, put it back on the queue and
# invoke parseError on parser.
if c != ";":
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"numeric-entity-without-semicolon"})
self.stream.unget(c)
return char
def consumeEntity(self, allowedChar=None, fromAttribute=False):
# Initialise to the default output for when no entity is matched
output = "&"
charStack = [self.stream.char()]
if charStack[0] in spaceCharacters or charStack[0] in (EOF, "<", "&") \
or (allowedChar is not None and allowedChar == charStack[0]):
self.stream.unget(charStack[0])
elif charStack[0] == "#":
# Read the next character to see if it's hex or decimal
hex = False
charStack.append(self.stream.char())
if charStack[-1] in ("x", "X"):
hex = True
charStack.append(self.stream.char())
# charStack[-1] should be the first digit
if (hex and charStack[-1] in hexDigits) \
or (not hex and charStack[-1] in digits):
# At least one digit found, so consume the whole number
self.stream.unget(charStack[-1])
output = self.consumeNumberEntity(hex)
else:
# No digits found
self.tokenQueue.append({"type": tokenTypes["ParseError"],
"data": "expected-numeric-entity"})
self.stream.unget(charStack.pop())
output = "&" + "".join(charStack)
else:
# At this point in the process might have named entity. Entities
# are stored in the global variable "entities".
#
# Consume characters and compare to these to a substring of the
# entity names in the list until the substring no longer matches.
filteredEntityList = entitiesByFirstChar.get(charStack[0], [])
def entitiesStartingWith(name):
return [e for e in filteredEntityList if e.startswith(name)]
while charStack[-1] is not EOF and\
entitiesStartingWith("".join(charStack)):
charStack.append(self.stream.char())
# At this point we have a string that starts with some characters
# that may match an entity
entityName = None
# Try to find the longest entity the string will match to take care
# of ¬i for instance.
for entityLength in range(len(charStack)-1, 1, -1):
possibleEntityName = "".join(charStack[:entityLength])
if possibleEntityName in entities:
entityName = possibleEntityName
break
if entityName is not None:
if entityName[-1] != ";":
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"named-entity-without-semicolon"})
if entityName[-1] != ";" and fromAttribute and \
(charStack[entityLength] in asciiLetters
or charStack[entityLength] in digits):
self.stream.unget(charStack.pop())
output = "&" + "".join(charStack)
else:
output = entities[entityName]
self.stream.unget(charStack.pop())
output += "".join(charStack[entityLength:])
else:
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"expected-named-entity"})
self.stream.unget(charStack.pop())
output = "&" + "".join(charStack)
if fromAttribute:
self.currentToken["data"][-1][1] += output
else:
self.tokenQueue.append({"type": tokenTypes["Characters"], "data": output})
def processEntityInAttribute(self, allowedChar):
"""This method replaces the need for "entityInAttributeValueState".
"""
self.consumeEntity(allowedChar=allowedChar, fromAttribute=True)
def emitCurrentToken(self):
"""This method is a generic handler for emitting the tags. It also sets
the state to "data" because that's what's needed after a token has been
emitted.
"""
token = self.currentToken
# Add token to the queue to be yielded
if (token["type"] in (tokenTypes["StartTag"], tokenTypes["EndTag"],
tokenTypes["EmptyTag"])):
if self.lowercaseElementName:
token["name"] = token["name"].translate(asciiUpper2Lower)
if token["type"] == tokenTypes["EndTag"]:
if token["data"]:
self.tokenQueue.append({"type":tokenTypes["ParseError"],
"data":"attributes-in-end-tag"})
if token["selfClosing"]:
self.tokenQueue.append({"type":tokenTypes["ParseError"],
"data":"self-closing-flag-on-end-tag"})
self.tokenQueue.append(token)
self.state = self.states["data"]
# Below are the various tokenizer states worked out.
def dataState(self):
data = self.stream.char()
# Keep a charbuffer to handle the escapeFlag
if (self.contentModelFlag in
(contentModelFlags["CDATA"], contentModelFlags["RCDATA"])):
if len(self.lastFourChars) == 4:
self.lastFourChars.pop(0)
self.lastFourChars.append(data)
# The rest of the logic
if (data == "&" and self.contentModelFlag in
(contentModelFlags["PCDATA"], contentModelFlags["RCDATA"]) and
not self.escapeFlag):
self.state = self.states["entityData"]
elif (data == "-" and self.contentModelFlag in
(contentModelFlags["CDATA"], contentModelFlags["RCDATA"]) and
not self.escapeFlag and "".join(self.lastFourChars) == "<!--"):
self.escapeFlag = True
self.tokenQueue.append({"type": tokenTypes["Characters"],
"data":data})
elif (data == "<" and (self.contentModelFlag ==
contentModelFlags["PCDATA"]
or (self.contentModelFlag in
(contentModelFlags["CDATA"],
contentModelFlags["RCDATA"]) and
self.escapeFlag == False))):
self.state = self.states["tagOpen"]
elif (data == ">" and self.contentModelFlag in
(contentModelFlags["CDATA"], contentModelFlags["RCDATA"]) and
self.escapeFlag and "".join(self.lastFourChars)[1:] == "-->"):
self.escapeFlag = False
self.tokenQueue.append({"type": tokenTypes["Characters"], "data":data})
elif data is EOF:
# Tokenization ends.
return False
elif data in spaceCharacters:
# Directly after emitting a token you switch back to the "data
# state". At that point spaceCharacters are important so they are
# emitted separately.
self.tokenQueue.append({"type": tokenTypes["SpaceCharacters"], "data":
data + self.stream.charsUntil(spaceCharacters, True)})
# No need to update lastFourChars here, since the first space will
# have already been appended to lastFourChars and will have broken
# any <!-- or --> sequences
else:
if (self.contentModelFlag in
(contentModelFlags["CDATA"], contentModelFlags["RCDATA"])):
chars = self.stream.charsUntil(("&", "<", ">", "-"))
self.lastFourChars += chars[-4:]
self.lastFourChars = self.lastFourChars[-4:]
else:
chars = self.stream.charsUntil(("&", "<"))
self.tokenQueue.append({"type": tokenTypes["Characters"], "data":
data + chars})
return True
def entityDataState(self):
self.consumeEntity()
self.state = self.states["data"]
return True
def tagOpenState(self):
data = self.stream.char()
if self.contentModelFlag == contentModelFlags["PCDATA"]:
if data == "!":
self.state = self.states["markupDeclarationOpen"]
elif data == "/":
self.state = self.states["closeTagOpen"]
elif data in asciiLetters:
self.currentToken = {"type": tokenTypes["StartTag"],
"name": data, "data": [],
"selfClosing": False,
"selfClosingAcknowledged": False}
self.state = self.states["tagName"]
elif data == ">":
# XXX In theory it could be something besides a tag name. But
# do we really care?
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"expected-tag-name-but-got-right-bracket"})
self.tokenQueue.append({"type": tokenTypes["Characters"], "data": "<>"})
self.state = self.states["data"]
elif data == "?":
# XXX In theory it could be something besides a tag name. But
# do we really care?
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"expected-tag-name-but-got-question-mark"})
self.stream.unget(data)
self.state = self.states["bogusComment"]
else:
# XXX
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"expected-tag-name"})
self.tokenQueue.append({"type": tokenTypes["Characters"], "data": "<"})
self.stream.unget(data)
self.state = self.states["data"]
else:
# We know the content model flag is set to either RCDATA or CDATA
# now because this state can never be entered with the PLAINTEXT
# flag.
if data == "/":
self.state = self.states["closeTagOpen"]
else:
self.tokenQueue.append({"type": tokenTypes["Characters"], "data": "<"})
self.stream.unget(data)
self.state = self.states["data"]
return True
def closeTagOpenState(self):
if (self.contentModelFlag in (contentModelFlags["RCDATA"],
contentModelFlags["CDATA"])):
charStack = []
if self.currentToken:
# So far we know that "</" has been consumed. We now need to know
# whether the next few characters match the name of last emitted
# start tag which also happens to be the currentToken.
matched = True
for expected in self.currentToken["name"].lower():
charStack.append(self.stream.char())
if charStack[-1] not in (expected, expected.upper()):
matched = False
break
# If the tag name prefix matched, we also need to check the
# subsequent character
if matched:
charStack.append(self.stream.char())
if charStack[-1] in (spaceCharacters | frozenset((">", "/", EOF))):
self.contentModelFlag = contentModelFlags["PCDATA"]
# Unget the last character, so it can be re-processed
# in the next state
self.stream.unget(charStack.pop())
# The remaining characters in charStack are the tag name
self.currentToken = {"type": tokenTypes["EndTag"],
"name": "".join(charStack),
"data": [],
"selfClosing":False}
self.state = self.states["tagName"]
return True
# Didn't find the end tag. The last character in charStack could be
# anything, so it has to be re-processed in the data state
self.stream.unget(charStack.pop())
# The remaining characters are a prefix of the tag name, so they're
# just letters and digits, so they can be output as character
# tokens immediately
self.tokenQueue.append({"type": tokenTypes["Characters"], "data": "</" + "".join(charStack)})
self.state = self.states["data"]
return True
data = self.stream.char()
if data in asciiLetters:
self.currentToken = {"type": tokenTypes["EndTag"], "name": data,
"data": [], "selfClosing":False}
self.state = self.states["tagName"]
elif data == ">":
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"expected-closing-tag-but-got-right-bracket"})
self.state = self.states["data"]
elif data is EOF:
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"expected-closing-tag-but-got-eof"})
self.tokenQueue.append({"type": tokenTypes["Characters"], "data": "</"})
self.state = self.states["data"]
else:
# XXX data can be _'_...
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"expected-closing-tag-but-got-char",
"datavars": {"data": data}})
self.stream.unget(data)
self.state = self.states["bogusComment"]
return True
def tagNameState(self):
data = self.stream.char()
if data in spaceCharacters:
self.state = self.states["beforeAttributeName"]
elif data == ">":
self.emitCurrentToken()
elif data is EOF:
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"eof-in-tag-name"})
self.emitCurrentToken()
elif data == "/":
self.state = self.states["selfClosingStartTag"]
else:
self.currentToken["name"] += data
# (Don't use charsUntil here, because tag names are
# very short and it's faster to not do anything fancy)
return True
def beforeAttributeNameState(self):
data = self.stream.char()
if data in spaceCharacters:
self.stream.charsUntil(spaceCharacters, True)
elif data in asciiLetters:
self.currentToken["data"].append([data, ""])
self.state = self.states["attributeName"]
elif data == ">":
self.emitCurrentToken()
elif data == "/":
self.state = self.states["selfClosingStartTag"]
elif data == "'" or data == '"' or data == "=":
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"invalid-character-in-attribute-name"})
self.currentToken["data"].append([data, ""])
self.state = self.states["attributeName"]
elif data is EOF:
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"expected-attribute-name-but-got-eof"})
self.emitCurrentToken()
else:
self.currentToken["data"].append([data, ""])
self.state = self.states["attributeName"]
return True
def attributeNameState(self):
data = self.stream.char()
leavingThisState = True
emitToken = False
if data == "=":
self.state = self.states["beforeAttributeValue"]
elif data in asciiLetters:
self.currentToken["data"][-1][0] += data +\
self.stream.charsUntil(asciiLetters, True)
leavingThisState = False
elif data == ">":
# XXX If we emit here the attributes are converted to a dict
# without being checked and when the code below runs we error
# because data is a dict not a list
emitToken = True
elif data in spaceCharacters:
self.state = self.states["afterAttributeName"]
elif data == "/":
self.state = self.states["selfClosingStartTag"]
elif data == "'" or data == '"':
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"invalid-character-in-attribute-name"})
self.currentToken["data"][-1][0] += data
leavingThisState = False
elif data is EOF:
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"eof-in-attribute-name"})
self.state = self.states["data"]
emitToken = True
else:
self.currentToken["data"][-1][0] += data
leavingThisState = False
if leavingThisState:
# Attributes are not dropped at this stage. That happens when the
# start tag token is emitted so values can still be safely appended
# to attributes, but we do want to report the parse error in time.
if self.lowercaseAttrName:
self.currentToken["data"][-1][0] = (
self.currentToken["data"][-1][0].translate(asciiUpper2Lower))
for name, value in self.currentToken["data"][:-1]:
if self.currentToken["data"][-1][0] == name:
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"duplicate-attribute"})
break
# XXX Fix for above XXX
if emitToken:
self.emitCurrentToken()
return True
def afterAttributeNameState(self):
data = self.stream.char()
if data in spaceCharacters:
self.stream.charsUntil(spaceCharacters, True)
elif data == "=":
self.state = self.states["beforeAttributeValue"]
elif data == ">":
self.emitCurrentToken()
elif data in asciiLetters:
self.currentToken["data"].append([data, ""])
self.state = self.states["attributeName"]
elif data == "/":
self.state = self.states["selfClosingStartTag"]
elif data == "'" or data == '"':
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"invalid-character-after-attribute-name"})
self.currentToken["data"].append([data, ""])
self.state = self.states["attributeName"]
elif data is EOF:
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"expected-end-of-tag-but-got-eof"})
self.emitCurrentToken()
else:
self.currentToken["data"].append([data, ""])
self.state = self.states["attributeName"]
return True
def beforeAttributeValueState(self):
data = self.stream.char()
if data in spaceCharacters:
self.stream.charsUntil(spaceCharacters, True)
elif data == "\"":
self.state = self.states["attributeValueDoubleQuoted"]
elif data == "&":
self.state = self.states["attributeValueUnQuoted"]
self.stream.unget(data);
elif data == "'":
self.state = self.states["attributeValueSingleQuoted"]
elif data == ">":
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"expected-attribute-value-but-got-right-bracket"})
self.emitCurrentToken()
elif data == "=":
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"equals-in-unquoted-attribute-value"})
self.currentToken["data"][-1][1] += data
self.state = self.states["attributeValueUnQuoted"]
elif data is EOF:
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"expected-attribute-value-but-got-eof"})
self.emitCurrentToken()
else:
self.currentToken["data"][-1][1] += data
self.state = self.states["attributeValueUnQuoted"]
return True
def attributeValueDoubleQuotedState(self):
data = self.stream.char()
if data == "\"":
self.state = self.states["afterAttributeValue"]
elif data == "&":
self.processEntityInAttribute('"')
elif data is EOF:
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"eof-in-attribute-value-double-quote"})
self.emitCurrentToken()
else:
self.currentToken["data"][-1][1] += data +\
self.stream.charsUntil(("\"", "&"))
return True
def attributeValueSingleQuotedState(self):
data = self.stream.char()
if data == "'":
self.state = self.states["afterAttributeValue"]
elif data == "&":
self.processEntityInAttribute("'")
elif data is EOF:
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"eof-in-attribute-value-single-quote"})
self.emitCurrentToken()
else:
self.currentToken["data"][-1][1] += data +\
self.stream.charsUntil(("'", "&"))
return True
def attributeValueUnQuotedState(self):
data = self.stream.char()
if data in spaceCharacters:
self.state = self.states["beforeAttributeName"]
elif data == "&":
self.processEntityInAttribute(None)
elif data == ">":
self.emitCurrentToken()
elif data == '"' or data == "'" or data == "=":
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"unexpected-character-in-unquoted-attribute-value"})
self.currentToken["data"][-1][1] += data
elif data is EOF:
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"eof-in-attribute-value-no-quotes"})
self.emitCurrentToken()
else:
self.currentToken["data"][-1][1] += data + self.stream.charsUntil( \
frozenset(("&", ">", "<", "=", "'", '"')) | spaceCharacters)
return True
def afterAttributeValueState(self):
data = self.stream.char()
if data in spaceCharacters:
self.state = self.states["beforeAttributeName"]
elif data == ">":
self.emitCurrentToken()
elif data == "/":
self.state = self.states["selfClosingStartTag"]
elif data is EOF:
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"unexpected-EOF-after-attribute-value"})
self.emitCurrentToken()
self.stream.unget(data)
self.state = self.states["data"]
else:
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"unexpected-character-after-attribute-value"})
self.stream.unget(data)
self.state = self.states["beforeAttributeName"]
return True
def selfClosingStartTagState(self):
data = self.stream.char()
if data == ">":
self.currentToken["selfClosing"] = True
self.emitCurrentToken()
elif data is EOF:
self.tokenQueue.append({"type": tokenTypes["ParseError"],
"data":
"unexpected-EOF-after-solidus-in-tag"})
self.emitCurrentToken()
self.stream.unget(data)
self.state = self.states["data"]
else:
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"unexpected-character-after-soldius-in-tag"})
self.stream.unget(data)
self.state = self.states["beforeAttributeName"]
return True
def bogusCommentState(self):
# Make a new comment token and give it as value all the characters
# until the first > or EOF (charsUntil checks for EOF automatically)
# and emit it.
self.tokenQueue.append(
{"type": tokenTypes["Comment"], "data": self.stream.charsUntil(">")})
# Eat the character directly after the bogus comment which is either a
# ">" or an EOF.
self.stream.char()
self.state = self.states["data"]
return True
def bogusCommentContinuationState(self):
# Like bogusCommentState, but the caller must create the comment token
# and this state just adds more characters to it
self.currentToken["data"] += self.stream.charsUntil(">")
self.tokenQueue.append(self.currentToken)
# Eat the character directly after the bogus comment which is either a
# ">" or an EOF.
self.stream.char()
self.state = self.states["data"]
return True
def markupDeclarationOpenState(self):
charStack = [self.stream.char()]
if charStack[-1] == "-":
charStack.append(self.stream.char())
if charStack[-1] == "-":
self.currentToken = {"type": tokenTypes["Comment"], "data": ""}
self.state = self.states["commentStart"]
return True
elif charStack[-1] in ('d', 'D'):
matched = True
for expected in (('o', 'O'), ('c', 'C'), ('t', 'T'),
('y', 'Y'), ('p', 'P'), ('e', 'E')):
charStack.append(self.stream.char())
if charStack[-1] not in expected:
matched = False
break
if matched:
self.currentToken = {"type": tokenTypes["Doctype"],
"name": "",
"publicId": None, "systemId": None,
"correct": True}
self.state = self.states["doctype"]
return True
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"expected-dashes-or-doctype"})
# charStack[:-2] consists of 'safe' characters ('-', 'd', 'o', etc)
# so they can be copied directly into the bogus comment data, and only
# the last character might be '>' or EOF and needs to be ungetted
self.stream.unget(charStack.pop())
self.currentToken = {"type": tokenTypes["Comment"],
"data": "".join(charStack)}
self.state = self.states["bogusCommentContinuation"]
return True
def commentStartState(self):
data = self.stream.char()
if data == "-":
self.state = self.states["commentStartDash"]
elif data == ">":
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"incorrect-comment"})
self.tokenQueue.append(self.currentToken)
self.state = self.states["data"]
elif data is EOF:
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"eof-in-comment"})
self.tokenQueue.append(self.currentToken)
self.state = self.states["data"]
else:
self.currentToken["data"] += data + self.stream.charsUntil("-")
self.state = self.states["comment"]
return True
def commentStartDashState(self):
data = self.stream.char()
if data == "-":
self.state = self.states["commentEnd"]
elif data == ">":
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"incorrect-comment"})
self.tokenQueue.append(self.currentToken)
self.state = self.states["data"]
elif data is EOF:
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"eof-in-comment"})
self.tokenQueue.append(self.currentToken)
self.state = self.states["data"]
else:
self.currentToken["data"] += "-" + data + self.stream.charsUntil("-")
self.state = self.states["comment"]
return True
def commentState(self):
data = self.stream.char()
if data == "-":
self.state = self.states["commentEndDash"]
elif data is EOF:
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"eof-in-comment"})
self.tokenQueue.append(self.currentToken)
self.state = self.states["data"]
else:
self.currentToken["data"] += data + self.stream.charsUntil("-")
return True
def commentEndDashState(self):
data = self.stream.char()
if data == "-":
self.state = self.states["commentEnd"]
elif data is EOF:
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"eof-in-comment-end-dash"})
self.tokenQueue.append(self.currentToken)
self.state = self.states["data"]
else:
self.currentToken["data"] += "-" + data +\
self.stream.charsUntil("-")
# Consume the next character which is either a "-" or an EOF as
# well so if there's a "-" directly after the "-" we go nicely to
# the "comment end state" without emitting a ParseError() there.
self.stream.char()
return True
def commentEndState(self):
data = self.stream.char()
if data == ">":
self.tokenQueue.append(self.currentToken)
self.state = self.states["data"]
elif data == "-":
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"unexpected-dash-after-double-dash-in-comment"})
self.currentToken["data"] += data
elif data is EOF:
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"eof-in-comment-double-dash"})
self.tokenQueue.append(self.currentToken)
self.state = self.states["data"]
else:
# XXX
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"unexpected-char-in-comment"})
self.currentToken["data"] += "--" + data
self.state = self.states["comment"]
return True
def doctypeState(self):
data = self.stream.char()
if data in spaceCharacters:
self.state = self.states["beforeDoctypeName"]
else:
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"need-space-after-doctype"})
self.stream.unget(data)
self.state = self.states["beforeDoctypeName"]
return True
def beforeDoctypeNameState(self):
data = self.stream.char()
if data in spaceCharacters:
pass
elif data == ">":
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"expected-doctype-name-but-got-right-bracket"})
self.currentToken["correct"] = False
self.tokenQueue.append(self.currentToken)
self.state = self.states["data"]
elif data is EOF:
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"expected-doctype-name-but-got-eof"})
self.currentToken["correct"] = False
self.tokenQueue.append(self.currentToken)
self.state = self.states["data"]
else:
self.currentToken["name"] = data
self.state = self.states["doctypeName"]
return True
def doctypeNameState(self):
data = self.stream.char()
if data in spaceCharacters:
self.currentToken["name"] = self.currentToken["name"].translate(asciiUpper2Lower)
self.state = self.states["afterDoctypeName"]
elif data == ">":
self.currentToken["name"] = self.currentToken["name"].translate(asciiUpper2Lower)
self.tokenQueue.append(self.currentToken)
self.state = self.states["data"]
elif data is EOF:
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"eof-in-doctype-name"})
self.currentToken["correct"] = False
self.currentToken["name"] = self.currentToken["name"].translate(asciiUpper2Lower)
self.tokenQueue.append(self.currentToken)
self.state = self.states["data"]
else:
self.currentToken["name"] += data
return True
def afterDoctypeNameState(self):
data = self.stream.char()
if data in spaceCharacters:
pass
elif data == ">":
self.tokenQueue.append(self.currentToken)
self.state = self.states["data"]
elif data is EOF:
self.currentToken["correct"] = False
self.stream.unget(data)
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"eof-in-doctype"})
self.tokenQueue.append(self.currentToken)
self.state = self.states["data"]
else:
if data in ("p", "P"):
matched = True
for expected in (("u", "U"), ("b", "B"), ("l", "L"),
("i", "I"), ("c", "C")):
data = self.stream.char()
if data not in expected:
matched = False
break
if matched:
self.state = self.states["beforeDoctypePublicIdentifier"]
return True
elif data in ("s", "S"):
matched = True
for expected in (("y", "Y"), ("s", "S"), ("t", "T"),
("e", "E"), ("m", "M")):
data = self.stream.char()
if data not in expected:
matched = False
break
if matched:
self.state = self.states["beforeDoctypeSystemIdentifier"]
return True
# All the characters read before the current 'data' will be
# [a-zA-Z], so they're garbage in the bogus doctype and can be
# discarded; only the latest character might be '>' or EOF
# and needs to be ungetted
self.stream.unget(data)
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"expected-space-or-right-bracket-in-doctype", "datavars":
{"data": data}})
self.currentToken["correct"] = False
self.state = self.states["bogusDoctype"]
return True
def beforeDoctypePublicIdentifierState(self):
data = self.stream.char()
if data in spaceCharacters:
pass
elif data == "\"":
self.currentToken["publicId"] = ""
self.state = self.states["doctypePublicIdentifierDoubleQuoted"]
elif data == "'":
self.currentToken["publicId"] = ""
self.state = self.states["doctypePublicIdentifierSingleQuoted"]
elif data == ">":
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"unexpected-end-of-doctype"})
self.currentToken["correct"] = False
self.tokenQueue.append(self.currentToken)
self.state = self.states["data"]
elif data is EOF:
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"eof-in-doctype"})
self.currentToken["correct"] = False
self.tokenQueue.append(self.currentToken)
self.state = self.states["data"]
else:
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"unexpected-char-in-doctype"})
self.currentToken["correct"] = False
self.state = self.states["bogusDoctype"]
return True
def doctypePublicIdentifierDoubleQuotedState(self):
data = self.stream.char()
if data == "\"":
self.state = self.states["afterDoctypePublicIdentifier"]
elif data == ">":
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"unexpected-end-of-doctype"})
self.currentToken["correct"] = False
self.tokenQueue.append(self.currentToken)
self.state = self.states["data"]
elif data is EOF:
self.tokenQueue.append({"type": tokenTypes["ParseError"], "data":
"eof-in-doctype"})
self.currentToken["correct"] = False
self.tokenQueue.append(self.currentToken)
self.state = self.states["data"]