Python/Lib/_markupbase.py · 青岛数智船海科技有限公司/FastCAEWinExtlib

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FastCAEWinExtlib

Python

Lib

_markupbase.py

_markupbase.py 14.26 KB

"""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.

"""

import re

_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*>')

del re

class ParserBase:
 """Parser base class which provides some common support methods used
 by the SGML/HTML and XHTML parsers."""

def __init__(self):
 if self.__class__ is ParserBase:
 raise RuntimeError(
 "_markupbase.ParserBase must be subclassed")

def error(self, message):
 raise NotImplementedError(
 "subclasses of ParserBase must override error()")

def reset(self):
 self.lineno = 1
 self.offset = 0

def getpos(self):
 """Return current line number and offset."""
 return self.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.
 def updatepos(self, i, j):
 if i >= j:
 return j
 rawdata = self.rawdata
 nlines = rawdata.count("\n", i, j)
 if nlines:
 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
 return j

_decl_otherchars = ''

# Internal -- parse declaration (for use by subclasses).
 def parse_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
 assert rawdata[i:j] == "<!", "unexpected call to parse_declaration"
 if rawdata[j:j+1] == ">":
 # the empty comment <!>
 return j + 1
 if rawdata[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)
 if rawdata[j:j+2] == '--': #comment
 # Locate --.*-- as the body of the comment
 return self.parse_comment(i)
 elif rawdata[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].
 return self.parse_marked_section(i)
 else: #all other declaration elements
 decltype, j = self._scan_name(j, i)
 if j < 0:
 return j
 if decltype == "doctype":
 self._decl_otherchars = ''
 while j < n:
 c = rawdata[j]
 if c == ">":
 # end of declaration syntax
 data = rawdata[i+2:j]
 if decltype == "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)
 return j + 1
 if c in "\"'":
 m = _declstringlit_match(rawdata, j)
 if not m:
 return -1 # incomplete
 j = m.end()
 elif c in "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ":
 name, j = self._scan_name(j, i)
 elif c in self._decl_otherchars:
 j = j + 1
 elif c == "[":
 # this could be handled in a separate doctype parser
 if decltype == "doctype":
 j = self._parse_doctype_subset(j + 1, i)
 elif decltype in {"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])
 if j < 0:
 return j
 return -1 # incomplete

# Internal -- parse a marked section
 # Override this to handle MS-word extension syntax <![if word]>content<![endif]>
 def parse_marked_section(self, i, report=1):
 rawdata= self.rawdata
 assert rawdata[i:i+3] == '<![', "unexpected call to parse_marked_section()"
 sectName, j = self._scan_name( i+3, i )
 if j < 0:
 return j
 if sectName in {"temp", "cdata", "ignore", "include", "rcdata"}:
 # look for standard ]]> ending
 match= _markedsectionclose.search(rawdata, i+3)
 elif sectName in {"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])
 if not match:
 return -1
 if report:
 j = match.start(0)
 self.unknown_decl(rawdata[i+3: j])
 return match.end(0)

# Internal -- parse comment, return length or -1 if not terminated
 def parse_comment(self, i, report=1):
 rawdata = self.rawdata
 if rawdata[i:i+4] != '<!--':
 self.error('unexpected call to parse_comment()')
 match = _commentclose.search(rawdata, i+4)
 if not match:
 return -1
 if report:
 j = match.start(0)
 self.handle_comment(rawdata[i+4: j])
 return match.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
 while j < n:
 c = rawdata[j]
 if c == "<":
 s = rawdata[j:j+2]
 if s == "<":
 # end of buffer; incomplete
 return -1
 if s != "<!":
 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
 if rawdata[j:j+4] == "<!--":
 j = self.parse_comment(j, report=0)
 if j < 0:
 return j
 continue
 name, j = self._scan_name(j + 2, declstartpos)
 if j == -1:
 return -1
 if name not in {"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)
 if j < 0:
 return j
 elif c == "%":
 # parameter entity reference
 if (j + 1) == n:
 # end of buffer; incomplete
 return -1
 s, j = self._scan_name(j + 1, declstartpos)
 if j < 0:
 return j
 if rawdata[j] == ";":
 j = j + 1
 elif c == "]":
 j = j + 1
 while j < n and rawdata[j].isspace():
 j = j + 1
 if j < n:
 if rawdata[j] == ">":
 return j
 self.updatepos(declstartpos, j)
 self.error("unexpected char after internal subset")
 else:
 return -1
 elif c.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)
 if j == -1:
 return -1
 # style content model; just skip until '>'
 rawdata = self.rawdata
 if '>' in rawdata[j:]:
 return rawdata.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]
 if c == "":
 return -1
 if c == ">":
 return j + 1
 while 1:
 # scan a series of attribute descriptions; simplified:
 # name type [value] [#constraint]
 name, j = self._scan_name(j, declstartpos)
 if j < 0:
 return j
 c = rawdata[j:j+1]
 if c == "":
 return -1
 if c == "(":
 # an enumerated type; look for ')'
 if ")" in rawdata[j:]:
 j = rawdata.find(")", j) + 1
 else:
 return -1
 while rawdata[j:j+1].isspace():
 j = j + 1
 if not rawdata[j:]:
 # end of buffer, incomplete
 return -1
 else:
 name, j = self._scan_name(j, declstartpos)
 c = rawdata[j:j+1]
 if not c:
 return -1
 if c in "'\"":
 m = _declstringlit_match(rawdata, j)
 if m:
 j = m.end()
 else:
 return -1
 c = rawdata[j:j+1]
 if not c:
 return -1
 if c == "#":
 if rawdata[j:] == "#":
 # end of buffer
 return -1
 name, j = self._scan_name(j + 1, declstartpos)
 if j < 0:
 return j
 c = rawdata[j:j+1]
 if not c:
 return -1
 if c == '>':
 # all done
 return j + 1

# Internal -- scan past <!NOTATION declarations
 def _parse_doctype_notation(self, i, declstartpos):
 name, j = self._scan_name(i, declstartpos)
 if j < 0:
 return j
 rawdata = self.rawdata
 while 1:
 c = rawdata[j:j+1]
 if not c:
 # end of buffer; incomplete
 return -1
 if c == '>':
 return j + 1
 if c in "'\"":
 m = _declstringlit_match(rawdata, j)
 if not m:
 return -1
 j = m.end()
 else:
 name, j = self._scan_name(j, declstartpos)
 if j < 0:
 return j

# Internal -- scan past <!ENTITY declarations
 def _parse_doctype_entity(self, i, declstartpos):
 rawdata = self.rawdata
 if rawdata[i:i+1] == "%":
 j = i + 1
 while 1:
 c = rawdata[j:j+1]
 if not c:
 return -1
 if c.isspace():
 j = j + 1
 else:
 break
 else:
 j = i
 name, j = self._scan_name(j, declstartpos)
 if j < 0:
 return j
 while 1:
 c = self.rawdata[j:j+1]
 if not c:
 return -1
 if c in "'\"":
 m = _declstringlit_match(rawdata, j)
 if m:
 j = m.end()
 else:
 return -1 # incomplete
 elif c == ">":
 return j + 1
 else:
 name, j = self._scan_name(j, declstartpos)
 if j < 0:
 return j

# 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)
 if i == n:
 return None, -1
 m = _declname_match(rawdata, i)
 if m:
 s = m.group()
 name = s.strip()
 if (i + len(s)) == n:
 return None, -1 # end of buffer
 return name.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
 def unknown_decl(self, data):
 pass

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禅元天道提交于 2022年09月21日 14:49 +08:00 . Python 3.7.0

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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.

"""

import re

_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*>')

del re


class ParserBase:
 """Parser base class which provides some common support methods used
 by the SGML/HTML and XHTML parsers."""

 def __init__(self):
 if self.__class__ is ParserBase:
 raise RuntimeError(
 "_markupbase.ParserBase must be subclassed")

 def error(self, message):
 raise NotImplementedError(
 "subclasses of ParserBase must override error()")

 def reset(self):
 self.lineno = 1
 self.offset = 0

 def getpos(self):
 """Return current line number and offset."""
 return self.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.
 def updatepos(self, i, j):
 if i >= j:
 return j
 rawdata = self.rawdata
 nlines = rawdata.count("\n", i, j)
 if nlines:
 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
 return j

 _decl_otherchars = ''

 # Internal -- parse declaration (for use by subclasses).
 def parse_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
 assert rawdata[i:j] == "<!", "unexpected call to parse_declaration"
 if rawdata[j:j+1] == ">":
 # the empty comment <!>
 return j + 1
 if rawdata[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)
 if rawdata[j:j+2] == '--': #comment
 # Locate --.*-- as the body of the comment
 return self.parse_comment(i)
 elif rawdata[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].
 return self.parse_marked_section(i)
 else: #all other declaration elements
 decltype, j = self._scan_name(j, i)
 if j < 0:
 return j
 if decltype == "doctype":
 self._decl_otherchars = ''
 while j < n:
 c = rawdata[j]
 if c == ">":
 # end of declaration syntax
 data = rawdata[i+2:j]
 if decltype == "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)
 return j + 1
 if c in "\"'":
 m = _declstringlit_match(rawdata, j)
 if not m:
 return -1 # incomplete
 j = m.end()
 elif c in "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ":
 name, j = self._scan_name(j, i)
 elif c in self._decl_otherchars:
 j = j + 1
 elif c == "[":
 # this could be handled in a separate doctype parser
 if decltype == "doctype":
 j = self._parse_doctype_subset(j + 1, i)
 elif decltype in {"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])
 if j < 0:
 return j
 return -1 # incomplete

 # Internal -- parse a marked section
 # Override this to handle MS-word extension syntax <![if word]>content<![endif]>
 def parse_marked_section(self, i, report=1):
 rawdata= self.rawdata
 assert rawdata[i:i+3] == '<![', "unexpected call to parse_marked_section()"
 sectName, j = self._scan_name( i+3, i )
 if j < 0:
 return j
 if sectName in {"temp", "cdata", "ignore", "include", "rcdata"}:
 # look for standard ]]> ending
 match= _markedsectionclose.search(rawdata, i+3)
 elif sectName in {"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])
 if not match:
 return -1
 if report:
 j = match.start(0)
 self.unknown_decl(rawdata[i+3: j])
 return match.end(0)

 # Internal -- parse comment, return length or -1 if not terminated
 def parse_comment(self, i, report=1):
 rawdata = self.rawdata
 if rawdata[i:i+4] != '<!--':
 self.error('unexpected call to parse_comment()')
 match = _commentclose.search(rawdata, i+4)
 if not match:
 return -1
 if report:
 j = match.start(0)
 self.handle_comment(rawdata[i+4: j])
 return match.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
 while j < n:
 c = rawdata[j]
 if c == "<":
 s = rawdata[j:j+2]
 if s == "<":
 # end of buffer; incomplete
 return -1
 if s != "<!":
 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
 if rawdata[j:j+4] == "<!--":
 j = self.parse_comment(j, report=0)
 if j < 0:
 return j
 continue
 name, j = self._scan_name(j + 2, declstartpos)
 if j == -1:
 return -1
 if name not in {"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)
 if j < 0:
 return j
 elif c == "%":
 # parameter entity reference
 if (j + 1) == n:
 # end of buffer; incomplete
 return -1
 s, j = self._scan_name(j + 1, declstartpos)
 if j < 0:
 return j
 if rawdata[j] == ";":
 j = j + 1
 elif c == "]":
 j = j + 1
 while j < n and rawdata[j].isspace():
 j = j + 1
 if j < n:
 if rawdata[j] == ">":
 return j
 self.updatepos(declstartpos, j)
 self.error("unexpected char after internal subset")
 else:
 return -1
 elif c.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)
 if j == -1:
 return -1
 # style content model; just skip until '>'
 rawdata = self.rawdata
 if '>' in rawdata[j:]:
 return rawdata.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]
 if c == "":
 return -1
 if c == ">":
 return j + 1
 while 1:
 # scan a series of attribute descriptions; simplified:
 # name type [value] [#constraint]
 name, j = self._scan_name(j, declstartpos)
 if j < 0:
 return j
 c = rawdata[j:j+1]
 if c == "":
 return -1
 if c == "(":
 # an enumerated type; look for ')'
 if ")" in rawdata[j:]:
 j = rawdata.find(")", j) + 1
 else:
 return -1
 while rawdata[j:j+1].isspace():
 j = j + 1
 if not rawdata[j:]:
 # end of buffer, incomplete
 return -1
 else:
 name, j = self._scan_name(j, declstartpos)
 c = rawdata[j:j+1]
 if not c:
 return -1
 if c in "'\"":
 m = _declstringlit_match(rawdata, j)
 if m:
 j = m.end()
 else:
 return -1
 c = rawdata[j:j+1]
 if not c:
 return -1
 if c == "#":
 if rawdata[j:] == "#":
 # end of buffer
 return -1
 name, j = self._scan_name(j + 1, declstartpos)
 if j < 0:
 return j
 c = rawdata[j:j+1]
 if not c:
 return -1
 if c == '>':
 # all done
 return j + 1

 # Internal -- scan past <!NOTATION declarations
 def _parse_doctype_notation(self, i, declstartpos):
 name, j = self._scan_name(i, declstartpos)
 if j < 0:
 return j
 rawdata = self.rawdata
 while 1:
 c = rawdata[j:j+1]
 if not c:
 # end of buffer; incomplete
 return -1
 if c == '>':
 return j + 1
 if c in "'\"":
 m = _declstringlit_match(rawdata, j)
 if not m:
 return -1
 j = m.end()
 else:
 name, j = self._scan_name(j, declstartpos)
 if j < 0:
 return j

 # Internal -- scan past <!ENTITY declarations
 def _parse_doctype_entity(self, i, declstartpos):
 rawdata = self.rawdata
 if rawdata[i:i+1] == "%":
 j = i + 1
 while 1:
 c = rawdata[j:j+1]
 if not c:
 return -1
 if c.isspace():
 j = j + 1
 else:
 break
 else:
 j = i
 name, j = self._scan_name(j, declstartpos)
 if j < 0:
 return j
 while 1:
 c = self.rawdata[j:j+1]
 if not c:
 return -1
 if c in "'\"":
 m = _declstringlit_match(rawdata, j)
 if m:
 j = m.end()
 else:
 return -1 # incomplete
 elif c == ">":
 return j + 1
 else:
 name, j = self._scan_name(j, declstartpos)
 if j < 0:
 return j

 # 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)
 if i == n:
 return None, -1
 m = _declname_match(rawdata, i)
 if m:
 s = m.group()
 name = s.strip()
 if (i + len(s)) == n:
 return None, -1 # end of buffer
 return name.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
 def unknown_decl(self, data):
 pass