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Merged
youknowone merged 1 commit into from
Sep 7, 2025
Merged

Update html* from 3.13.7 #6133

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218 changes: 129 additions & 89 deletions Lib/html/parser.py
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Original file line number Diff line number Diff line change
Expand Up @@ -27,18 +27,48 @@
attr_charref = re.compile(r'&(#[0-9]+|#[xX][0-9a-fA-F]+|[a-zA-Z][a-zA-Z0-9]*)[;=]?')

starttagopen = re.compile('<[a-zA-Z]')
endtagopen = re.compile('</[a-zA-Z]')
piclose = re.compile('>')
commentclose = re.compile(r'--\s*>')
commentclose = re.compile(r'--!?>')
commentabruptclose = re.compile(r'-?>')
# Note:
# 1) if you change tagfind/attrfind remember to update locatestarttagend too;
# 2) if you change tagfind/attrfind and/or locatestarttagend the parser will
# 1) if you change tagfind/attrfind remember to update locatetagend too;
# 2) if you change tagfind/attrfind and/or locatetagend the parser will
# explode, so don't do it.
# see http://www.w3.org/TR/html5/tokenization.html#tag-open-state
# and http://www.w3.org/TR/html5/tokenization.html#tag-name-state
tagfind_tolerant = re.compile(r'([a-zA-Z][^\t\n\r\f />\x00]*)(?:\s|/(?!>))*')
attrfind_tolerant = re.compile(
r'((?<=[\'"\s/])[^\s/>][^\s/=>]*)(\s*=+\s*'
r'(\'[^\']*\'|"[^"]*"|(?![\'"])[^>\s]*))?(?:\s|/(?!>))*')
# see the HTML5 specs section "13.2.5.6 Tag open state",
# "13.2.5.8 Tag name state" and "13.2.5.33 Attribute name state".
# https://html.spec.whatwg.org/multipage/parsing.html#tag-open-state
# https://html.spec.whatwg.org/multipage/parsing.html#tag-name-state
# https://html.spec.whatwg.org/multipage/parsing.html#attribute-name-state
tagfind_tolerant = re.compile(r'([a-zA-Z][^\t\n\r\f />]*)(?:[\t\n\r\f ]|/(?!>))*')
attrfind_tolerant = re.compile(r"""
(
(?<=['"\t\n\r\f /])[^\t\n\r\f />][^\t\n\r\f /=>]* # attribute name
)
([\t\n\r\f ]*=[\t\n\r\f ]* # value indicator
('[^']*' # LITA-enclosed value
|"[^"]*" # LIT-enclosed value
|(?!['"])[^>\t\n\r\f ]* # bare value
)
)?
(?:[\t\n\r\f ]|/(?!>))* # possibly followed by a space
""", re.VERBOSE)
locatetagend = re.compile(r"""
[a-zA-Z][^\t\n\r\f />]* # tag name
[\t\n\r\f /]* # optional whitespace before attribute name
(?:(?<=['"\t\n\r\f /])[^\t\n\r\f />][^\t\n\r\f /=>]* # attribute name
(?:[\t\n\r\f ]*=[\t\n\r\f ]* # value indicator
(?:'[^']*' # LITA-enclosed value
|"[^"]*" # LIT-enclosed value
|(?!['"])[^>\t\n\r\f ]* # bare value
)
)?
[\t\n\r\f /]* # possibly followed by a space
)*
>?
""", re.VERBOSE)
# The following variables are not used, but are temporarily left for
# backward compatibility.
locatestarttagend_tolerant = re.compile(r"""
<[a-zA-Z][^\t\n\r\f />\x00]* # tag name
(?:[\s/]* # optional whitespace before attribute name
Expand All @@ -55,8 +85,6 @@
\s* # trailing whitespace
""", re.VERBOSE)
endendtag = re.compile('>')
# the HTML 5 spec, section 8.1.2.2, doesn't allow spaces between
# </ and the tag name, so maybe this should be fixed
endtagfind = re.compile(r'</\s*([a-zA-Z][-.a-zA-Z0-9:_]*)\s*>')

# Character reference processing logic specific to attribute values
Expand Down Expand Up @@ -100,6 +128,7 @@ class HTMLParser(_markupbase.ParserBase):
"""

CDATA_CONTENT_ELEMENTS = ("script", "style")
RCDATA_CONTENT_ELEMENTS = ("textarea", "title")

def __init__(self, *, convert_charrefs=True):
"""Initialize and reset this instance.
Expand All @@ -117,6 +146,7 @@ def reset(self):
self.lasttag = '???'
self.interesting = interesting_normal
self.cdata_elem = None
self._escapable = True
super().reset()

def feed(self, data):
Expand All @@ -138,13 +168,20 @@ def get_starttag_text(self):
"""Return full source of start tag: '<...>'."""
return self.__starttag_text

def set_cdata_mode(self, elem):
def set_cdata_mode(self, elem, *, escapable=False):
self.cdata_elem = elem.lower()
self.interesting = re.compile(r'</\s*%s\s*>' % self.cdata_elem, re.I)
self._escapable = escapable
if escapable and not self.convert_charrefs:
self.interesting = re.compile(r'&|</%s(?=[\t\n\r\f />])' % self.cdata_elem,
re.IGNORECASE|re.ASCII)
else:
self.interesting = re.compile(r'</%s(?=[\t\n\r\f />])' % self.cdata_elem,
re.IGNORECASE|re.ASCII)

def clear_cdata_mode(self):
self.interesting = interesting_normal
self.cdata_elem = None
self._escapable = True

# Internal -- handle data as far as reasonable. May leave state
# and data to be processed by a subsequent call. If 'end' is
Expand All @@ -165,7 +202,7 @@ def goahead(self, end):
# & near the end and see if it's followed by a space or ;.
amppos = rawdata.rfind('&', max(i, n-34))
if (amppos >= 0 and
not re.compile(r'[\s;]').search(rawdata, amppos)):
not re.compile(r'[\t\n\r\f ;]').search(rawdata, amppos)):
break # wait till we get all the text
j = n
else:
Expand All @@ -177,7 +214,7 @@ def goahead(self, end):
break
j = n
if i < j:
if self.convert_charrefs and not self.cdata_elem:
if self.convert_charrefs and self._escapable:
self.handle_data(unescape(rawdata[i:j]))
else:
self.handle_data(rawdata[i:j])
Expand All @@ -195,25 +232,43 @@ def goahead(self, end):
k = self.parse_pi(i)
elif startswith("<!", i):
k = self.parse_html_declaration(i)
elif (i + 1) < n:
elif (i + 1) < n or end:
self.handle_data("<")
k = i + 1
else:
break
if k < 0:
if not end:
break
k = rawdata.find('>', i + 1)
if k < 0:
k = rawdata.find('<', i + 1)
if k < 0:
k = i + 1
else:
k += 1
if self.convert_charrefs and not self.cdata_elem:
self.handle_data(unescape(rawdata[i:k]))
if starttagopen.match(rawdata, i): # < + letter
pass
elif startswith("</", i):
if i + 2 == n:
self.handle_data("</")
elif endtagopen.match(rawdata, i): # </ + letter
pass
else:
# bogus comment
self.handle_comment(rawdata[i+2:])
elif startswith("<!--", i):
j = n
for suffix in ("--!", "--", "-"):
if rawdata.endswith(suffix, i+4):
j -= len(suffix)
break
self.handle_comment(rawdata[i+4:j])
elif startswith("<![CDATA[", i):
self.unknown_decl(rawdata[i+3:])
elif rawdata[i:i+9].lower() == '<!doctype':
self.handle_decl(rawdata[i+2:])
elif startswith("<!", i):
# bogus comment
self.handle_comment(rawdata[i+2:])
elif startswith("<?", i):
self.handle_pi(rawdata[i+2:])
else:
self.handle_data(rawdata[i:k])
raise AssertionError("we should not get here!")
k = n
i = self.updatepos(i, k)
elif startswith("&#", i):
match = charref.match(rawdata, i)
Expand Down Expand Up @@ -261,7 +316,7 @@ def goahead(self, end):
assert 0, "interesting.search() lied"
# end while
if end and i < n:
if self.convert_charrefs and not self.cdata_elem:
if self.convert_charrefs and self._escapable:
self.handle_data(unescape(rawdata[i:n]))
else:
self.handle_data(rawdata[i:n])
Expand Down Expand Up @@ -290,8 +345,23 @@ def parse_html_declaration(self, i):
else:
return self.parse_bogus_comment(i)

# Internal -- parse comment, return length or -1 if not terminated
# see https://html.spec.whatwg.org/multipage/parsing.html#comment-start-state
def parse_comment(self, i, report=True):
rawdata = self.rawdata
assert rawdata.startswith('<!--', i), 'unexpected call to parse_comment()'
match = commentclose.search(rawdata, i+4)
if not match:
match = commentabruptclose.match(rawdata, i+4)
if not match:
return -1
if report:
j = match.start()
self.handle_comment(rawdata[i+4: j])
return match.end()

# Internal -- parse bogus comment, return length or -1 if not terminated
# see http://www.w3.org/TR/html5/tokenization.html#bogus-comment-state
# see https://html.spec.whatwg.org/multipage/parsing.html#bogus-comment-state
def parse_bogus_comment(self, i, report=1):
rawdata = self.rawdata
assert rawdata[i:i+2] in ('<!', '</'), ('unexpected call to '
Expand All @@ -317,6 +387,8 @@ def parse_pi(self, i):

# Internal -- handle starttag, return end or -1 if not terminated
def parse_starttag(self, i):
# See the HTML5 specs section "13.2.5.8 Tag name state"
# https://html.spec.whatwg.org/multipage/parsing.html#tag-name-state
self.__starttag_text = None
endpos = self.check_for_whole_start_tag(i)
if endpos < 0:
Expand Down Expand Up @@ -356,82 +428,50 @@ def parse_starttag(self, i):
self.handle_starttag(tag, attrs)
if tag in self.CDATA_CONTENT_ELEMENTS:
self.set_cdata_mode(tag)
elif tag in self.RCDATA_CONTENT_ELEMENTS:
self.set_cdata_mode(tag, escapable=True)
return endpos

# Internal -- check to see if we have a complete starttag; return end
# or -1 if incomplete.
def check_for_whole_start_tag(self, i):
rawdata = self.rawdata
m = locatestarttagend_tolerant.match(rawdata, i)
if m:
j = m.end()
next = rawdata[j:j+1]
if next == ">":
return j + 1
if next == "/":
if rawdata.startswith("/>", j):
return j + 2
if rawdata.startswith("/", j):
# buffer boundary
return -1
# else bogus input
if j > i:
return j
else:
return i + 1
if next == "":
# end of input
return -1
if next in ("abcdefghijklmnopqrstuvwxyz=/"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"):
# end of input in or before attribute value, or we have the
# '/' from a '/>' ending
return -1
if j > i:
return j
else:
return i + 1
raise AssertionError("we should not get here!")
match = locatetagend.match(rawdata, i+1)
assert match
j = match.end()
if rawdata[j-1] != ">":
return -1
return j

# Internal -- parse endtag, return end or -1 if incomplete
def parse_endtag(self, i):
# See the HTML5 specs section "13.2.5.7 End tag open state"
# https://html.spec.whatwg.org/multipage/parsing.html#end-tag-open-state
rawdata = self.rawdata
assert rawdata[i:i+2] == "</", "unexpected call to parse_endtag"
match = endendtag.search(rawdata, i+1) # >
if not match:
if rawdata.find('>', i+2) < 0: # fast check
return -1
gtpos = match.end()
match = endtagfind.match(rawdata, i) # </ + tag + >
if not match:
if self.cdata_elem is not None:
self.handle_data(rawdata[i:gtpos])
return gtpos
# find the name: w3.org/TR/html5/tokenization.html#tag-name-state
namematch = tagfind_tolerant.match(rawdata, i+2)
if not namematch:
# w3.org/TR/html5/tokenization.html#end-tag-open-state
if rawdata[i:i+3] == '</>':
return i+3
else:
return self.parse_bogus_comment(i)
tagname = namematch.group(1).lower()
# consume and ignore other stuff between the name and the >
# Note: this is not 100% correct, since we might have things like
# </tag attr=">">, but looking for > after the name should cover
# most of the cases and is much simpler
gtpos = rawdata.find('>', namematch.end())
self.handle_endtag(tagname)
return gtpos+1
if not endtagopen.match(rawdata, i): # </ + letter
if rawdata[i+2:i+3] == '>': # </> is ignored
# "missing-end-tag-name" parser error
return i+3
else:
return self.parse_bogus_comment(i)

elem = match.group(1).lower() # script or style
if self.cdata_elem is not None:
if elem != self.cdata_elem:
self.handle_data(rawdata[i:gtpos])
return gtpos
match = locatetagend.match(rawdata, i+2)
assert match
j = match.end()
if rawdata[j-1] != ">":
return -1

self.handle_endtag(elem)
# find the name: "13.2.5.8 Tag name state"
# https://html.spec.whatwg.org/multipage/parsing.html#tag-name-state
match = tagfind_tolerant.match(rawdata, i+2)
assert match
tag = match.group(1).lower()
self.handle_endtag(tag)
self.clear_cdata_mode()
return gtpos
return j

# Overridable -- finish processing of start+end tag: <tag.../>
def handle_startendtag(self, tag, attrs):
Expand Down
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