EmbeddedPkg: Extend NvVarStoreFormattedLib LIBRARY_CLASS

[mirror_edk2.git] / AppPkg / Applications / Python / Python-2.7.2 / Lib / HTMLParser.py

"""A parser for HTML and XHTML."""\r
\r
# This file is based on sgmllib.py, but the API is slightly different.\r
\r
# XXX There should be a way to distinguish between PCDATA (parsed\r
# character data -- the normal case), RCDATA (replaceable character\r
# data -- only char and entity references and end tags are special)\r
# and CDATA (character data -- only end tags are special).\r
\r
\r
import markupbase\r
import re\r
\r
# Regular expressions used for parsing\r
\r
interesting_normal = re.compile('[&<]')\r
interesting_cdata = re.compile(r'<(/|\Z)')\r
incomplete = re.compile('&[a-zA-Z#]')\r
\r
entityref = re.compile('&([a-zA-Z][-.a-zA-Z0-9]*)[^a-zA-Z0-9]')\r
charref = re.compile('&#(?:[0-9]+|[xX][0-9a-fA-F]+)[^0-9a-fA-F]')\r
\r
starttagopen = re.compile('<[a-zA-Z]')\r
piclose = re.compile('>')\r
commentclose = re.compile(r'--\s*>')\r
tagfind = re.compile('[a-zA-Z][-.a-zA-Z0-9:_]*')\r
attrfind = re.compile(\r
    r'\s*([a-zA-Z_][-.:a-zA-Z_0-9]*)(\s*=\s*'\r
    r'(\'[^\']*\'|"[^"]*"|[^\s"\'=<>`]*))?')\r
\r
locatestarttagend = re.compile(r"""\r
  <[a-zA-Z][-.a-zA-Z0-9:_]*          # tag name\r
  (?:\s+                             # whitespace before attribute name\r
    (?:[a-zA-Z_][-.:a-zA-Z0-9_]*     # attribute name\r
      (?:\s*=\s*                     # value indicator\r
        (?:'[^']*'                   # LITA-enclosed value\r
          |\"[^\"]*\"                # LIT-enclosed value\r
          |[^'\">\s]+                # bare value\r
         )\r
       )?\r
     )\r
   )*\r
  \s*                                # trailing whitespace\r
""", re.VERBOSE)\r
endendtag = re.compile('>')\r
endtagfind = re.compile('</\s*([a-zA-Z][-.a-zA-Z0-9:_]*)\s*>')\r
\r
\r
class HTMLParseError(Exception):\r
    """Exception raised for all parse errors."""\r
\r
    def __init__(self, msg, position=(None, None)):\r
        assert msg\r
        self.msg = msg\r
        self.lineno = position[0]\r
        self.offset = position[1]\r
\r
    def __str__(self):\r
        result = self.msg\r
        if self.lineno is not None:\r
            result = result + ", at line %d" % self.lineno\r
        if self.offset is not None:\r
            result = result + ", column %d" % (self.offset + 1)\r
        return result\r
\r
\r
class HTMLParser(markupbase.ParserBase):\r
    """Find tags and other markup and call handler functions.\r
\r
    Usage:\r
        p = HTMLParser()\r
        p.feed(data)\r
        ...\r
        p.close()\r
\r
    Start tags are handled by calling self.handle_starttag() or\r
    self.handle_startendtag(); end tags by self.handle_endtag().  The\r
    data between tags is passed from the parser to the derived class\r
    by calling self.handle_data() with the data as argument (the data\r
    may be split up in arbitrary chunks).  Entity references are\r
    passed by calling self.handle_entityref() with the entity\r
    reference as the argument.  Numeric character references are\r
    passed to self.handle_charref() with the string containing the\r
    reference as the argument.\r
    """\r
\r
    CDATA_CONTENT_ELEMENTS = ("script", "style")\r
\r
\r
    def __init__(self):\r
        """Initialize and reset this instance."""\r
        self.reset()\r
\r
    def reset(self):\r
        """Reset this instance.  Loses all unprocessed data."""\r
        self.rawdata = ''\r
        self.lasttag = '???'\r
        self.interesting = interesting_normal\r
        markupbase.ParserBase.reset(self)\r
\r
    def feed(self, data):\r
        r"""Feed data to the parser.\r
\r
        Call this as often as you want, with as little or as much text\r
        as you want (may include '\n').\r
        """\r
        self.rawdata = self.rawdata + data\r
        self.goahead(0)\r
\r
    def close(self):\r
        """Handle any buffered data."""\r
        self.goahead(1)\r
\r
    def error(self, message):\r
        raise HTMLParseError(message, self.getpos())\r
\r
    __starttag_text = None\r
\r
    def get_starttag_text(self):\r
        """Return full source of start tag: '<...>'."""\r
        return self.__starttag_text\r
\r
    def set_cdata_mode(self):\r
        self.interesting = interesting_cdata\r
\r
    def clear_cdata_mode(self):\r
        self.interesting = interesting_normal\r
\r
    # Internal -- handle data as far as reasonable.  May leave state\r
    # and data to be processed by a subsequent call.  If 'end' is\r
    # true, force handling all data as if followed by EOF marker.\r
    def goahead(self, end):\r
        rawdata = self.rawdata\r
        i = 0\r
        n = len(rawdata)\r
        while i < n:\r
            match = self.interesting.search(rawdata, i) # < or &\r
            if match:\r
                j = match.start()\r
            else:\r
                j = n\r
            if i < j: self.handle_data(rawdata[i:j])\r
            i = self.updatepos(i, j)\r
            if i == n: break\r
            startswith = rawdata.startswith\r
            if startswith('<', i):\r
                if starttagopen.match(rawdata, i): # < + letter\r
                    k = self.parse_starttag(i)\r
                elif startswith("</", i):\r
                    k = self.parse_endtag(i)\r
                elif startswith("<!--", i):\r
                    k = self.parse_comment(i)\r
                elif startswith("<?", i):\r
                    k = self.parse_pi(i)\r
                elif startswith("<!", i):\r
                    k = self.parse_declaration(i)\r
                elif (i + 1) < n:\r
                    self.handle_data("<")\r
                    k = i + 1\r
                else:\r
                    break\r
                if k < 0:\r
                    if end:\r
                        self.error("EOF in middle of construct")\r
                    break\r
                i = self.updatepos(i, k)\r
            elif startswith("&#", i):\r
                match = charref.match(rawdata, i)\r
                if match:\r
                    name = match.group()[2:-1]\r
                    self.handle_charref(name)\r
                    k = match.end()\r
                    if not startswith(';', k-1):\r
                        k = k - 1\r
                    i = self.updatepos(i, k)\r
                    continue\r
                else:\r
                    if ";" in rawdata[i:]: #bail by consuming &#\r
                        self.handle_data(rawdata[0:2])\r
                        i = self.updatepos(i, 2)\r
                    break\r
            elif startswith('&', i):\r
                match = entityref.match(rawdata, i)\r
                if match:\r
                    name = match.group(1)\r
                    self.handle_entityref(name)\r
                    k = match.end()\r
                    if not startswith(';', k-1):\r
                        k = k - 1\r
                    i = self.updatepos(i, k)\r
                    continue\r
                match = incomplete.match(rawdata, i)\r
                if match:\r
                    # match.group() will contain at least 2 chars\r
                    if end and match.group() == rawdata[i:]:\r
                        self.error("EOF in middle of entity or char ref")\r
                    # incomplete\r
                    break\r
                elif (i + 1) < n:\r
                    # not the end of the buffer, and can't be confused\r
                    # with some other construct\r
                    self.handle_data("&")\r
                    i = self.updatepos(i, i + 1)\r
                else:\r
                    break\r
            else:\r
                assert 0, "interesting.search() lied"\r
        # end while\r
        if end and i < n:\r
            self.handle_data(rawdata[i:n])\r
            i = self.updatepos(i, n)\r
        self.rawdata = rawdata[i:]\r
\r
    # Internal -- parse processing instr, return end or -1 if not terminated\r
    def parse_pi(self, i):\r
        rawdata = self.rawdata\r
        assert rawdata[i:i+2] == '<?', 'unexpected call to parse_pi()'\r
        match = piclose.search(rawdata, i+2) # >\r
        if not match:\r
            return -1\r
        j = match.start()\r
        self.handle_pi(rawdata[i+2: j])\r
        j = match.end()\r
        return j\r
\r
    # Internal -- handle starttag, return end or -1 if not terminated\r
    def parse_starttag(self, i):\r
        self.__starttag_text = None\r
        endpos = self.check_for_whole_start_tag(i)\r
        if endpos < 0:\r
            return endpos\r
        rawdata = self.rawdata\r
        self.__starttag_text = rawdata[i:endpos]\r
\r
        # Now parse the data between i+1 and j into a tag and attrs\r
        attrs = []\r
        match = tagfind.match(rawdata, i+1)\r
        assert match, 'unexpected call to parse_starttag()'\r
        k = match.end()\r
        self.lasttag = tag = rawdata[i+1:k].lower()\r
\r
        while k < endpos:\r
            m = attrfind.match(rawdata, k)\r
            if not m:\r
                break\r
            attrname, rest, attrvalue = m.group(1, 2, 3)\r
            if not rest:\r
                attrvalue = None\r
            elif attrvalue[:1] == '\'' == attrvalue[-1:] or \\r
                 attrvalue[:1] == '"' == attrvalue[-1:]:\r
                attrvalue = attrvalue[1:-1]\r
                attrvalue = self.unescape(attrvalue)\r
            attrs.append((attrname.lower(), attrvalue))\r
            k = m.end()\r
\r
        end = rawdata[k:endpos].strip()\r
        if end not in (">", "/>"):\r
            lineno, offset = self.getpos()\r
            if "\n" in self.__starttag_text:\r
                lineno = lineno + self.__starttag_text.count("\n")\r
                offset = len(self.__starttag_text) \\r
                         - self.__starttag_text.rfind("\n")\r
            else:\r
                offset = offset + len(self.__starttag_text)\r
            self.error("junk characters in start tag: %r"\r
                       % (rawdata[k:endpos][:20],))\r
        if end.endswith('/>'):\r
            # XHTML-style empty tag: <span attr="value" />\r
            self.handle_startendtag(tag, attrs)\r
        else:\r
            self.handle_starttag(tag, attrs)\r
            if tag in self.CDATA_CONTENT_ELEMENTS:\r
                self.set_cdata_mode()\r
        return endpos\r
\r
    # Internal -- check to see if we have a complete starttag; return end\r
    # or -1 if incomplete.\r
    def check_for_whole_start_tag(self, i):\r
        rawdata = self.rawdata\r
        m = locatestarttagend.match(rawdata, i)\r
        if m:\r
            j = m.end()\r
            next = rawdata[j:j+1]\r
            if next == ">":\r
                return j + 1\r
            if next == "/":\r
                if rawdata.startswith("/>", j):\r
                    return j + 2\r
                if rawdata.startswith("/", j):\r
                    # buffer boundary\r
                    return -1\r
                # else bogus input\r
                self.updatepos(i, j + 1)\r
                self.error("malformed empty start tag")\r
            if next == "":\r
                # end of input\r
                return -1\r
            if next in ("abcdefghijklmnopqrstuvwxyz=/"\r
                        "ABCDEFGHIJKLMNOPQRSTUVWXYZ"):\r
                # end of input in or before attribute value, or we have the\r
                # '/' from a '/>' ending\r
                return -1\r
            self.updatepos(i, j)\r
            self.error("malformed start tag")\r
        raise AssertionError("we should not get here!")\r
\r
    # Internal -- parse endtag, return end or -1 if incomplete\r
    def parse_endtag(self, i):\r
        rawdata = self.rawdata\r
        assert rawdata[i:i+2] == "</", "unexpected call to parse_endtag"\r
        match = endendtag.search(rawdata, i+1) # >\r
        if not match:\r
            return -1\r
        j = match.end()\r
        match = endtagfind.match(rawdata, i) # </ + tag + >\r
        if not match:\r
            self.error("bad end tag: %r" % (rawdata[i:j],))\r
        tag = match.group(1)\r
        self.handle_endtag(tag.lower())\r
        self.clear_cdata_mode()\r
        return j\r
\r
    # Overridable -- finish processing of start+end tag: <tag.../>\r
    def handle_startendtag(self, tag, attrs):\r
        self.handle_starttag(tag, attrs)\r
        self.handle_endtag(tag)\r
\r
    # Overridable -- handle start tag\r
    def handle_starttag(self, tag, attrs):\r
        pass\r
\r
    # Overridable -- handle end tag\r
    def handle_endtag(self, tag):\r
        pass\r
\r
    # Overridable -- handle character reference\r
    def handle_charref(self, name):\r
        pass\r
\r
    # Overridable -- handle entity reference\r
    def handle_entityref(self, name):\r
        pass\r
\r
    # Overridable -- handle data\r
    def handle_data(self, data):\r
        pass\r
\r
    # Overridable -- handle comment\r
    def handle_comment(self, data):\r
        pass\r
\r
    # Overridable -- handle declaration\r
    def handle_decl(self, decl):\r
        pass\r
\r
    # Overridable -- handle processing instruction\r
    def handle_pi(self, data):\r
        pass\r
\r
    def unknown_decl(self, data):\r
        self.error("unknown declaration: %r" % (data,))\r
\r
    # Internal -- helper to remove special character quoting\r
    entitydefs = None\r
    def unescape(self, s):\r
        if '&' not in s:\r
            return s\r
        def replaceEntities(s):\r
            s = s.groups()[0]\r
            try:\r
                if s[0] == "#":\r
                    s = s[1:]\r
                    if s[0] in ['x','X']:\r
                        c = int(s[1:], 16)\r
                    else:\r
                        c = int(s)\r
                    return unichr(c)\r
            except ValueError:\r
                return '&#'+s+';'\r
            else:\r
                # Cannot use name2codepoint directly, because HTMLParser supports apos,\r
                # which is not part of HTML 4\r
                import htmlentitydefs\r
                if HTMLParser.entitydefs is None:\r
                    entitydefs = HTMLParser.entitydefs = {'apos':u"'"}\r
                    for k, v in htmlentitydefs.name2codepoint.iteritems():\r
                        entitydefs[k] = unichr(v)\r
                try:\r
                    return self.entitydefs[s]\r
                except KeyError:\r
                    return '&'+s+';'\r
\r
        return re.sub(r"&(#?[xX]?(?:[0-9a-fA-F]+|\w{1,8}));", replaceEntities, s)\r