--- /dev/null
+"""Shared support for scanning document type declarations in HTML and XHTML."""
+
+import re
+import string
+
+_declname_match = re.compile(r'[a-zA-Z][-_.a-zA-Z0-9]*\s*').match
+_declstringlit_match = re.compile(r'(\'[^\']*\'|"[^"]*")\s*').match
+
+del re
+
+
+class ParserBase:
+ """Parser base class which provides some common support methods used
+ by the SGML/HTML and XHTML parsers."""
+
+ 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 = string.count(rawdata, "\n", i, j)
+ if nlines:
+ self.lineno = self.lineno + nlines
+ pos = string.rindex(rawdata, "\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...>").
+ rawdata = self.rawdata
+ import sys
+ j = i + 2
+ assert rawdata[i:j] == "<!", "unexpected call to parse_declaration"
+ if rawdata[j:j+1] in ("-", ""):
+ # Start of comment followed by buffer boundary,
+ # or just a buffer boundary.
+ return -1
+ # in practice, this should look like: ((name|stringlit) S*)+ '>'
+ n = len(rawdata)
+ 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:
+ 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 == "[":
+ if decltype == "doctype":
+ j = self._parse_doctype_subset(j + 1, i)
+ else:
+ self.error("unexpected '[' char in declaration")
+ else:
+ self.error(
+ "unexpected %s char in declaration" % `rawdata[j]`)
+ if j < 0:
+ return j
+ return -1 # incomplete
+
+ # 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 %s)"
+ % `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 %s 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] in string.whitespace:
+ 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 in string.whitespace:
+ j = j + 1
+ else:
+ self.updatepos(declstartpos, j)
+ self.error("unexpected char %s in internal subset" % `c`)
+ # end of buffer reached
+ return -1
+
+ # Internal -- scan past <!ELEMENT declarations
+ def _parse_doctype_element(self, i, declstartpos):
+ rawdata = self.rawdata
+ n = len(rawdata)
+ name, j = self._scan_name(i, declstartpos)
+ if j == -1:
+ return -1
+ # style content model; just skip until '>'
+ if '>' in rawdata[j:]:
+ return string.find(rawdata, ">", 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 = string.find(rawdata, ")", j) + 1
+ else:
+ return -1
+ while rawdata[j:j+1] in string.whitespace:
+ 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 in string.whitespace:
+ 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", self.getpos())
projects / python / commitdiff