kopia lustrzana https://github.com/micropython/micropython-lib
Merge branch 'cpython-3.3.3'
Paul Sokolovsky
commit
e9b736e24a
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@ -0,0 +1,21 @@
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"""
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General functions for HTML manipulation.
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"""
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_escape_map = {ord('&'): '&', ord('<'): '<', ord('>'): '>'}
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_escape_map_full = {ord('&'): '&', ord('<'): '<', ord('>'): '>',
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ord('"'): '"', ord('\''): '''}
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# NB: this is a candidate for a bytes/string polymorphic interface
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def escape(s, quote=True):
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"""
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Replace special characters "&", "<" and ">" to HTML-safe sequences.
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If the optional flag quote is true (the default), the quotation mark
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characters, both double quote (") and single quote (') characters are also
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translated.
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"""
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if quote:
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return s.translate(_escape_map_full)
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return s.translate(_escape_map)
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Plik diff jest za duży
Load Diff
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@ -0,0 +1,532 @@
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"""A parser for HTML and XHTML."""
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# This file is based on sgmllib.py, but the API is slightly different.
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# XXX There should be a way to distinguish between PCDATA (parsed
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# character data -- the normal case), RCDATA (replaceable character
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# data -- only char and entity references and end tags are special)
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# and CDATA (character data -- only end tags are special).
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import _markupbase
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import re
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import warnings
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# Regular expressions used for parsing
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interesting_normal = re.compile('[&<]')
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incomplete = re.compile('&[a-zA-Z#]')
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entityref = re.compile('&([a-zA-Z][-.a-zA-Z0-9]*)[^a-zA-Z0-9]')
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charref = re.compile('&#(?:[0-9]+|[xX][0-9a-fA-F]+)[^0-9a-fA-F]')
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starttagopen = re.compile('<[a-zA-Z]')
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piclose = re.compile('>')
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commentclose = re.compile(r'--\s*>')
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tagfind = re.compile('([a-zA-Z][-.a-zA-Z0-9:_]*)(?:\s|/(?!>))*')
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# see http://www.w3.org/TR/html5/tokenization.html#tag-open-state
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# and http://www.w3.org/TR/html5/tokenization.html#tag-name-state
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tagfind_tolerant = re.compile('[a-zA-Z][^\t\n\r\f />\x00]*')
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# Note:
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# 1) the strict attrfind isn't really strict, but we can't make it
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# correctly strict without breaking backward compatibility;
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# 2) if you change attrfind remember to update locatestarttagend too;
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# 3) if you change attrfind and/or locatestarttagend the parser will
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# explode, so don't do it.
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attrfind = re.compile(
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r'\s*([a-zA-Z_][-.:a-zA-Z_0-9]*)(\s*=\s*'
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r'(\'[^\']*\'|"[^"]*"|[^\s"\'=<>`]*))?')
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attrfind_tolerant = re.compile(
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r'((?<=[\'"\s/])[^\s/>][^\s/=>]*)(\s*=+\s*'
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r'(\'[^\']*\'|"[^"]*"|(?![\'"])[^>\s]*))?(?:\s|/(?!>))*')
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locatestarttagend = re.compile(r"""
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<[a-zA-Z][-.a-zA-Z0-9:_]* # tag name
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(?:\s+ # whitespace before attribute name
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(?:[a-zA-Z_][-.:a-zA-Z0-9_]* # attribute name
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(?:\s*=\s* # value indicator
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(?:'[^']*' # LITA-enclosed value
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|\"[^\"]*\" # LIT-enclosed value
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|[^'\">\s]+ # bare value
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)
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)?
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)
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)*
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\s* # trailing whitespace
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""", re.VERBOSE)
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locatestarttagend_tolerant = re.compile(r"""
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<[a-zA-Z][-.a-zA-Z0-9:_]* # tag name
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(?:[\s/]* # optional whitespace before attribute name
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(?:(?<=['"\s/])[^\s/>][^\s/=>]* # attribute name
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(?:\s*=+\s* # value indicator
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(?:'[^']*' # LITA-enclosed value
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|"[^"]*" # LIT-enclosed value
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|(?!['"])[^>\s]* # bare value
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)
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(?:\s*,)* # possibly followed by a comma
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)?(?:\s|/(?!>))*
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)*
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)?
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\s* # trailing whitespace
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""", re.VERBOSE)
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endendtag = re.compile('>')
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# the HTML 5 spec, section 8.1.2.2, doesn't allow spaces between
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# </ and the tag name, so maybe this should be fixed
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endtagfind = re.compile('</\s*([a-zA-Z][-.a-zA-Z0-9:_]*)\s*>')
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class HTMLParseError(Exception):
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"""Exception raised for all parse errors."""
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def __init__(self, msg, position=(None, None)):
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assert msg
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self.msg = msg
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self.lineno = position[0]
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self.offset = position[1]
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def __str__(self):
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result = self.msg
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if self.lineno is not None:
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result = result + ", at line %d" % self.lineno
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if self.offset is not None:
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result = result + ", column %d" % (self.offset + 1)
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return result
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class HTMLParser(_markupbase.ParserBase):
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"""Find tags and other markup and call handler functions.
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Usage:
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p = HTMLParser()
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p.feed(data)
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...
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p.close()
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Start tags are handled by calling self.handle_starttag() or
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self.handle_startendtag(); end tags by self.handle_endtag(). The
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data between tags is passed from the parser to the derived class
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by calling self.handle_data() with the data as argument (the data
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may be split up in arbitrary chunks). Entity references are
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passed by calling self.handle_entityref() with the entity
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reference as the argument. Numeric character references are
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passed to self.handle_charref() with the string containing the
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reference as the argument.
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"""
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CDATA_CONTENT_ELEMENTS = ("script", "style")
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def __init__(self, strict=False):
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"""Initialize and reset this instance.
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If strict is set to False (the default) the parser will parse invalid
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markup, otherwise it will raise an error. Note that the strict mode
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is deprecated.
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"""
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if strict:
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warnings.warn("The strict mode is deprecated.",
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DeprecationWarning, stacklevel=2)
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self.strict = strict
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self.reset()
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def reset(self):
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"""Reset this instance. Loses all unprocessed data."""
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self.rawdata = ''
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self.lasttag = '???'
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self.interesting = interesting_normal
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self.cdata_elem = None
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_markupbase.ParserBase.reset(self)
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def feed(self, data):
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r"""Feed data to the parser.
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Call this as often as you want, with as little or as much text
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as you want (may include '\n').
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"""
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self.rawdata = self.rawdata + data
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self.goahead(0)
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def close(self):
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"""Handle any buffered data."""
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self.goahead(1)
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def error(self, message):
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raise HTMLParseError(message, self.getpos())
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__starttag_text = None
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def get_starttag_text(self):
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"""Return full source of start tag: '<...>'."""
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return self.__starttag_text
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def set_cdata_mode(self, elem):
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self.cdata_elem = elem.lower()
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self.interesting = re.compile(r'</\s*%s\s*>' % self.cdata_elem, re.I)
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def clear_cdata_mode(self):
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self.interesting = interesting_normal
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self.cdata_elem = None
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# Internal -- handle data as far as reasonable. May leave state
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# and data to be processed by a subsequent call. If 'end' is
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# true, force handling all data as if followed by EOF marker.
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def goahead(self, end):
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rawdata = self.rawdata
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i = 0
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n = len(rawdata)
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while i < n:
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match = self.interesting.search(rawdata, i) # < or &
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if match:
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j = match.start()
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else:
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if self.cdata_elem:
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break
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j = n
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if i < j: self.handle_data(rawdata[i:j])
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i = self.updatepos(i, j)
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if i == n: break
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startswith = rawdata.startswith
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if startswith('<', i):
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if starttagopen.match(rawdata, i): # < + letter
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k = self.parse_starttag(i)
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elif startswith("</", i):
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k = self.parse_endtag(i)
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elif startswith("<!--", i):
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k = self.parse_comment(i)
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elif startswith("<?", i):
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k = self.parse_pi(i)
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elif startswith("<!", i):
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if self.strict:
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k = self.parse_declaration(i)
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else:
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k = self.parse_html_declaration(i)
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elif (i + 1) < n:
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self.handle_data("<")
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k = i + 1
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else:
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break
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if k < 0:
|
||||
if not end:
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break
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if self.strict:
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self.error("EOF in middle of construct")
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k = rawdata.find('>', i + 1)
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if k < 0:
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k = rawdata.find('<', i + 1)
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if k < 0:
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k = i + 1
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else:
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k += 1
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self.handle_data(rawdata[i:k])
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i = self.updatepos(i, k)
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elif startswith("&#", i):
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match = charref.match(rawdata, i)
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if match:
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name = match.group()[2:-1]
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self.handle_charref(name)
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k = match.end()
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if not startswith(';', k-1):
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k = k - 1
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i = self.updatepos(i, k)
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continue
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else:
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if ";" in rawdata[i:]: #bail by consuming &#
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self.handle_data(rawdata[0:2])
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i = self.updatepos(i, 2)
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break
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elif startswith('&', i):
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match = entityref.match(rawdata, i)
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if match:
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name = match.group(1)
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self.handle_entityref(name)
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k = match.end()
|
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if not startswith(';', k-1):
|
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k = k - 1
|
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i = self.updatepos(i, k)
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continue
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match = incomplete.match(rawdata, i)
|
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if match:
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# match.group() will contain at least 2 chars
|
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if end and match.group() == rawdata[i:]:
|
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if self.strict:
|
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self.error("EOF in middle of entity or char ref")
|
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else:
|
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k = match.end()
|
||||
if k <= i:
|
||||
k = n
|
||||
i = self.updatepos(i, i + 1)
|
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# incomplete
|
||||
break
|
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elif (i + 1) < n:
|
||||
# not the end of the buffer, and can't be confused
|
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# with some other construct
|
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self.handle_data("&")
|
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i = self.updatepos(i, i + 1)
|
||||
else:
|
||||
break
|
||||
else:
|
||||
assert 0, "interesting.search() lied"
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# end while
|
||||
if end and i < n and not self.cdata_elem:
|
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self.handle_data(rawdata[i:n])
|
||||
i = self.updatepos(i, n)
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self.rawdata = rawdata[i:]
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|
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# Internal -- parse html declarations, return length or -1 if not terminated
|
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# See w3.org/TR/html5/tokenization.html#markup-declaration-open-state
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||||
# See also parse_declaration in _markupbase
|
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def parse_html_declaration(self, i):
|
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rawdata = self.rawdata
|
||||
assert rawdata[i:i+2] == '<!', ('unexpected call to '
|
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'parse_html_declaration()')
|
||||
if rawdata[i:i+4] == '<!--':
|
||||
# this case is actually already handled in goahead()
|
||||
return self.parse_comment(i)
|
||||
elif rawdata[i:i+3] == '<![':
|
||||
return self.parse_marked_section(i)
|
||||
elif rawdata[i:i+9].lower() == '<!doctype':
|
||||
# find the closing >
|
||||
gtpos = rawdata.find('>', i+9)
|
||||
if gtpos == -1:
|
||||
return -1
|
||||
self.handle_decl(rawdata[i+2:gtpos])
|
||||
return gtpos+1
|
||||
else:
|
||||
return self.parse_bogus_comment(i)
|
||||
|
||||
# Internal -- parse bogus comment, return length or -1 if not terminated
|
||||
# see http://www.w3.org/TR/html5/tokenization.html#bogus-comment-state
|
||||
def parse_bogus_comment(self, i, report=1):
|
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rawdata = self.rawdata
|
||||
assert rawdata[i:i+2] in ('<!', '</'), ('unexpected call to '
|
||||
'parse_comment()')
|
||||
pos = rawdata.find('>', i+2)
|
||||
if pos == -1:
|
||||
return -1
|
||||
if report:
|
||||
self.handle_comment(rawdata[i+2:pos])
|
||||
return pos + 1
|
||||
|
||||
# Internal -- parse processing instr, return end or -1 if not terminated
|
||||
def parse_pi(self, i):
|
||||
rawdata = self.rawdata
|
||||
assert rawdata[i:i+2] == '<?', 'unexpected call to parse_pi()'
|
||||
match = piclose.search(rawdata, i+2) # >
|
||||
if not match:
|
||||
return -1
|
||||
j = match.start()
|
||||
self.handle_pi(rawdata[i+2: j])
|
||||
j = match.end()
|
||||
return j
|
||||
|
||||
# Internal -- handle starttag, return end or -1 if not terminated
|
||||
def parse_starttag(self, i):
|
||||
self.__starttag_text = None
|
||||
endpos = self.check_for_whole_start_tag(i)
|
||||
if endpos < 0:
|
||||
return endpos
|
||||
rawdata = self.rawdata
|
||||
self.__starttag_text = rawdata[i:endpos]
|
||||
|
||||
# Now parse the data between i+1 and j into a tag and attrs
|
||||
attrs = []
|
||||
match = tagfind.match(rawdata, i+1)
|
||||
assert match, 'unexpected call to parse_starttag()'
|
||||
k = match.end()
|
||||
self.lasttag = tag = match.group(1).lower()
|
||||
while k < endpos:
|
||||
if self.strict:
|
||||
m = attrfind.match(rawdata, k)
|
||||
else:
|
||||
m = attrfind_tolerant.match(rawdata, k)
|
||||
if not m:
|
||||
break
|
||||
attrname, rest, attrvalue = m.group(1, 2, 3)
|
||||
if not rest:
|
||||
attrvalue = None
|
||||
elif attrvalue[:1] == '\'' == attrvalue[-1:] or \
|
||||
attrvalue[:1] == '"' == attrvalue[-1:]:
|
||||
attrvalue = attrvalue[1:-1]
|
||||
if attrvalue:
|
||||
attrvalue = self.unescape(attrvalue)
|
||||
attrs.append((attrname.lower(), attrvalue))
|
||||
k = m.end()
|
||||
|
||||
end = rawdata[k:endpos].strip()
|
||||
if end not in (">", "/>"):
|
||||
lineno, offset = self.getpos()
|
||||
if "\n" in self.__starttag_text:
|
||||
lineno = lineno + self.__starttag_text.count("\n")
|
||||
offset = len(self.__starttag_text) \
|
||||
- self.__starttag_text.rfind("\n")
|
||||
else:
|
||||
offset = offset + len(self.__starttag_text)
|
||||
if self.strict:
|
||||
self.error("junk characters in start tag: %r"
|
||||
% (rawdata[k:endpos][:20],))
|
||||
self.handle_data(rawdata[i:endpos])
|
||||
return endpos
|
||||
if end.endswith('/>'):
|
||||
# XHTML-style empty tag: <span attr="value" />
|
||||
self.handle_startendtag(tag, attrs)
|
||||
else:
|
||||
self.handle_starttag(tag, attrs)
|
||||
if tag in self.CDATA_CONTENT_ELEMENTS:
|
||||
self.set_cdata_mode(tag)
|
||||
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
|
||||
if self.strict:
|
||||
m = locatestarttagend.match(rawdata, i)
|
||||
else:
|
||||
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 self.strict:
|
||||
self.updatepos(i, j + 1)
|
||||
self.error("malformed empty start tag")
|
||||
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 self.strict:
|
||||
self.updatepos(i, j)
|
||||
self.error("malformed start tag")
|
||||
if j > i:
|
||||
return j
|
||||
else:
|
||||
return i + 1
|
||||
raise AssertionError("we should not get here!")
|
||||
|
||||
# Internal -- parse endtag, return end or -1 if incomplete
|
||||
def parse_endtag(self, i):
|
||||
rawdata = self.rawdata
|
||||
assert rawdata[i:i+2] == "</", "unexpected call to parse_endtag"
|
||||
match = endendtag.search(rawdata, i+1) # >
|
||||
if not match:
|
||||
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
|
||||
if self.strict:
|
||||
self.error("bad end tag: %r" % (rawdata[i: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().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 tha name should cover
|
||||
# most of the cases and is much simpler
|
||||
gtpos = rawdata.find('>', namematch.end())
|
||||
self.handle_endtag(tagname)
|
||||
return gtpos+1
|
||||
|
||||
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
|
||||
|
||||
self.handle_endtag(elem.lower())
|
||||
self.clear_cdata_mode()
|
||||
return gtpos
|
||||
|
||||
# Overridable -- finish processing of start+end tag: <tag.../>
|
||||
def handle_startendtag(self, tag, attrs):
|
||||
self.handle_starttag(tag, attrs)
|
||||
self.handle_endtag(tag)
|
||||
|
||||
# Overridable -- handle start tag
|
||||
def handle_starttag(self, tag, attrs):
|
||||
pass
|
||||
|
||||
# Overridable -- handle end tag
|
||||
def handle_endtag(self, tag):
|
||||
pass
|
||||
|
||||
# Overridable -- handle character reference
|
||||
def handle_charref(self, name):
|
||||
pass
|
||||
|
||||
# Overridable -- handle entity reference
|
||||
def handle_entityref(self, name):
|
||||
pass
|
||||
|
||||
# Overridable -- handle data
|
||||
def handle_data(self, data):
|
||||
pass
|
||||
|
||||
# Overridable -- handle comment
|
||||
def handle_comment(self, data):
|
||||
pass
|
||||
|
||||
# Overridable -- handle declaration
|
||||
def handle_decl(self, decl):
|
||||
pass
|
||||
|
||||
# Overridable -- handle processing instruction
|
||||
def handle_pi(self, data):
|
||||
pass
|
||||
|
||||
def unknown_decl(self, data):
|
||||
if self.strict:
|
||||
self.error("unknown declaration: %r" % (data,))
|
||||
|
||||
# Internal -- helper to remove special character quoting
|
||||
def unescape(self, s):
|
||||
if '&' not in s:
|
||||
return s
|
||||
def replaceEntities(s):
|
||||
s = s.groups()[0]
|
||||
try:
|
||||
if s[0] == "#":
|
||||
s = s[1:]
|
||||
if s[0] in ['x','X']:
|
||||
c = int(s[1:].rstrip(';'), 16)
|
||||
else:
|
||||
c = int(s.rstrip(';'))
|
||||
return chr(c)
|
||||
except ValueError:
|
||||
return '&#' + s
|
||||
else:
|
||||
from html.entities import html5
|
||||
if s in html5:
|
||||
return html5[s]
|
||||
elif s.endswith(';'):
|
||||
return '&' + s
|
||||
for x in range(2, len(s)):
|
||||
if s[:x] in html5:
|
||||
return html5[s[:x]] + s[x:]
|
||||
else:
|
||||
return '&' + s
|
||||
|
||||
return re.sub(r"&(#?[xX]?(?:[0-9a-fA-F]+;|\w{1,32};?))",
|
||||
replaceEntities, s, flags=re.ASCII)
|
||||
Ładowanie…
Reference in New Issue