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_markupbase.py
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"""Shared support for scanning document type declarations in HTML and XHTML.
This module is used as a foundation for the html.parser module. It has no
documented public API and should not be used directly.
"""
importre
_declname_match=re.compile(r"[a-zA-Z][-_.a-zA-Z0-9]*\s*").match
_declstringlit_match=re.compile(r'(\'[^\']*\'|"[^"]*")\s*').match
_commentclose=re.compile(r"--\s*>")
_markedsectionclose=re.compile(r"]\s*]\s*>")
# An analysis of the MS-Word extensions is available at
# http://www.planetpublish.com/xmlarena/xap/Thursday/WordtoXML.pdf
_msmarkedsectionclose=re.compile(r"]\s*>")
delre
classParserBase:
"""Parser base class which provides some common support methods used
by the SGML/HTML and XHTML parsers."""
def__init__(self):
ifself.__class__isParserBase:
raiseRuntimeError("_markupbase.ParserBase must be subclassed")
deferror(self, message):
raiseNotImplementedError("subclasses of ParserBase must override error()")
defreset(self):
self.lineno=1
self.offset=0
defgetpos(self):
"""Return current line number and offset."""
returnself.lineno, self.offset
# Internal -- update line number and offset. This should be
# called for each piece of data exactly once, in order -- in other
# words the concatenation of all the input strings to this
# function should be exactly the entire input.
defupdatepos(self, i, j):
ifi>=j:
returnj
rawdata=self.rawdata
nlines=rawdata.count("\n", i, j)
ifnlines:
self.lineno=self.lineno+nlines
pos=rawdata.rindex("\n", i, j) # Should not fail
self.offset=j- (pos+1)
else:
self.offset=self.offset+j-i
returnj
_decl_otherchars=""
# Internal -- parse declaration (for use by subclasses).
defparse_declaration(self, i):
# This is some sort of declaration; in "HTML as
# deployed," this should only be the document type
# declaration ("<!DOCTYPE html...>").
# ISO 8879:1986, however, has more complex
# declaration syntax for elements in <!...>, including:
# --comment--
# [marked section]
# name in the following list: ENTITY, DOCTYPE, ELEMENT,
# ATTLIST, NOTATION, SHORTREF, USEMAP,
# LINKTYPE, LINK, IDLINK, USELINK, SYSTEM
rawdata=self.rawdata
j=i+2
assertrawdata[i:j] =="<!", "unexpected call to parse_declaration"
ifrawdata[j : j+1] ==">":
# the empty comment <!>
returnj+1
ifrawdata[j : j+1] in ("-", ""):
# Start of comment followed by buffer boundary,
# or just a buffer boundary.
return-1
# A simple, practical version could look like: ((name|stringlit) S*) + '>'
n=len(rawdata)
ifrawdata[j : j+2] =="--": # comment
# Locate --.*-- as the body of the comment
returnself.parse_comment(i)
elifrawdata[j] =="[": # marked section
# Locate [statusWord [...arbitrary SGML...]] as the body of the marked section
# Where statusWord is one of TEMP, CDATA, IGNORE, INCLUDE, RCDATA
# Note that this is extended by Microsoft Office "Save as Web" function
# to include [if...] and [endif].
returnself.parse_marked_section(i)
else: # all other declaration elements
decltype, j=self._scan_name(j, i)
ifj<0:
returnj
ifdecltype=="doctype":
self._decl_otherchars=""
whilej<n:
c=rawdata[j]
ifc==">":
# end of declaration syntax
data=rawdata[i+2 : j]
ifdecltype=="doctype":
self.handle_decl(data)
else:
# According to the HTML5 specs sections "8.2.4.44 Bogus
# comment state" and "8.2.4.45 Markup declaration open
# state", a comment token should be emitted.
# Calling unknown_decl provides more flexibility though.
self.unknown_decl(data)
returnj+1
ifcin"\"'":
m=_declstringlit_match(rawdata, j)
ifnotm:
return-1# incomplete
j=m.end()
elifcin"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ":
name, j=self._scan_name(j, i)
elifcinself._decl_otherchars:
j=j+1
elifc=="[":
# this could be handled in a separate doctype parser
ifdecltype=="doctype":
j=self._parse_doctype_subset(j+1, i)
elifdecltypein {"attlist", "linktype", "link", "element"}:
# must tolerate []'d groups in a content model in an element declaration
# also in data attribute specifications of attlist declaration
# also link type declaration subsets in linktype declarations
# also link attribute specification lists in link declarations
self.error("unsupported '[' char in %s declaration"%decltype)
else:
self.error("unexpected '[' char in declaration")
else:
self.error("unexpected %r char in declaration"%rawdata[j])
ifj<0:
returnj
return-1# incomplete
# Internal -- parse a marked section
# Override this to handle MS-word extension syntax <![if word]>content<![endif]>
defparse_marked_section(self, i, report=1):
rawdata=self.rawdata
assertrawdata[i : i+3] =="<![", "unexpected call to parse_marked_section()"
sectName, j=self._scan_name(i+3, i)
ifj<0:
returnj
ifsectNamein {"temp", "cdata", "ignore", "include", "rcdata"}:
# look for standard ]]> ending
match=_markedsectionclose.search(rawdata, i+3)
elifsectNamein {"if", "else", "endif"}:
# look for MS Office ]> ending
match=_msmarkedsectionclose.search(rawdata, i+3)
else:
self.error("unknown status keyword %r in marked section"%rawdata[i+3 : j])
ifnotmatch:
return-1
ifreport:
j=match.start(0)
self.unknown_decl(rawdata[i+3 : j])
returnmatch.end(0)
# Internal -- parse comment, return length or -1 if not terminated
defparse_comment(self, i, report=1):
rawdata=self.rawdata
ifrawdata[i : i+4] !="<!--":
self.error("unexpected call to parse_comment()")
match=_commentclose.search(rawdata, i+4)
ifnotmatch:
return-1
ifreport:
j=match.start(0)
self.handle_comment(rawdata[i+4 : j])
returnmatch.end(0)
# Internal -- scan past the internal subset in a <!DOCTYPE declaration,
# returning the index just past any whitespace following the trailing ']'.
def_parse_doctype_subset(self, i, declstartpos):
rawdata=self.rawdata
n=len(rawdata)
j=i
whilej<n:
c=rawdata[j]
ifc=="<":
s=rawdata[j : j+2]
ifs=="<":
# end of buffer; incomplete
return-1
ifs!="<!":
self.updatepos(declstartpos, j+1)
self.error("unexpected char in internal subset (in %r)"%s)
if (j+2) ==n:
# end of buffer; incomplete
return-1
if (j+4) >n:
# end of buffer; incomplete
return-1
ifrawdata[j : j+4] =="<!--":
j=self.parse_comment(j, report=0)
ifj<0:
returnj
continue
name, j=self._scan_name(j+2, declstartpos)
ifj==-1:
return-1
ifnamenotin {"attlist", "element", "entity", "notation"}:
self.updatepos(declstartpos, j+2)
self.error("unknown declaration %r in internal subset"%name)
# handle the individual names
meth=getattr(self, "_parse_doctype_"+name)
j=meth(j, declstartpos)
ifj<0:
returnj
elifc=="%":
# parameter entity reference
if (j+1) ==n:
# end of buffer; incomplete
return-1
s, j=self._scan_name(j+1, declstartpos)
ifj<0:
returnj
ifrawdata[j] ==";":
j=j+1
elifc=="]":
j=j+1
whilej<nandrawdata[j].isspace():
j=j+1
ifj<n:
ifrawdata[j] ==">":
returnj
self.updatepos(declstartpos, j)
self.error("unexpected char after internal subset")
else:
return-1
elifc.isspace():
j=j+1
else:
self.updatepos(declstartpos, j)
self.error("unexpected char %r in internal subset"%c)
# end of buffer reached
return-1
# Internal -- scan past <!ELEMENT declarations
def_parse_doctype_element(self, i, declstartpos):
name, j=self._scan_name(i, declstartpos)
ifj==-1:
return-1
# style content model; just skip until '>'
rawdata=self.rawdata
if">"inrawdata[j:]:
returnrawdata.find(">", j) +1
return-1
# Internal -- scan past <!ATTLIST declarations
def_parse_doctype_attlist(self, i, declstartpos):
rawdata=self.rawdata
name, j=self._scan_name(i, declstartpos)
c=rawdata[j : j+1]
ifc=="":
return-1
ifc==">":
returnj+1
while1:
# scan a series of attribute descriptions; simplified:
# name type [value] [#constraint]
name, j=self._scan_name(j, declstartpos)
ifj<0:
returnj
c=rawdata[j : j+1]
ifc=="":
return-1
ifc=="(":
# an enumerated type; look for ')'
if")"inrawdata[j:]:
j=rawdata.find(")", j) +1
else:
return-1
whilerawdata[j : j+1].isspace():
j=j+1
ifnotrawdata[j:]:
# end of buffer, incomplete
return-1
else:
name, j=self._scan_name(j, declstartpos)
c=rawdata[j : j+1]
ifnotc:
return-1
ifcin"'\"":
m=_declstringlit_match(rawdata, j)
ifm:
j=m.end()
else:
return-1
c=rawdata[j : j+1]
ifnotc:
return-1
ifc=="#":
ifrawdata[j:] =="#":
# end of buffer
return-1
name, j=self._scan_name(j+1, declstartpos)
ifj<0:
returnj
c=rawdata[j : j+1]
ifnotc:
return-1
ifc==">":
# all done
returnj+1
# Internal -- scan past <!NOTATION declarations
def_parse_doctype_notation(self, i, declstartpos):
name, j=self._scan_name(i, declstartpos)
ifj<0:
returnj
rawdata=self.rawdata
while1:
c=rawdata[j : j+1]
ifnotc:
# end of buffer; incomplete
return-1
ifc==">":
returnj+1
ifcin"'\"":
m=_declstringlit_match(rawdata, j)
ifnotm:
return-1
j=m.end()
else:
name, j=self._scan_name(j, declstartpos)
ifj<0:
returnj
# Internal -- scan past <!ENTITY declarations
def_parse_doctype_entity(self, i, declstartpos):
rawdata=self.rawdata
ifrawdata[i : i+1] =="%":
j=i+1
while1:
c=rawdata[j : j+1]
ifnotc:
return-1
ifc.isspace():
j=j+1
else:
break
else:
j=i
name, j=self._scan_name(j, declstartpos)
ifj<0:
returnj
while1:
c=self.rawdata[j : j+1]
ifnotc:
return-1
ifcin"'\"":
m=_declstringlit_match(rawdata, j)
ifm:
j=m.end()
else:
return-1# incomplete
elifc==">":
returnj+1
else:
name, j=self._scan_name(j, declstartpos)
ifj<0:
returnj
# Internal -- scan a name token and the new position and the token, or
# return -1 if we've reached the end of the buffer.
def_scan_name(self, i, declstartpos):
rawdata=self.rawdata
n=len(rawdata)
ifi==n:
returnNone, -1
m=_declname_match(rawdata, i)
ifm:
s=m.group()
name=s.strip()
if (i+len(s)) ==n:
returnNone, -1# end of buffer
returnname.lower(), m.end()
else:
self.updatepos(declstartpos, i)
self.error("expected name token at %r"%rawdata[declstartpos : declstartpos+20])
# To be overridden -- handlers for unknown objects
defunknown_decl(self, data):
pass
