Lib/xmllib.py

   1 """A parser for XML, using the derived class as static DTD."""
   2
   3 # Author: Sjoerd Mullender.
   4
   5 import re
   6 import string
   7
   8 import warnings
   9 warnings.warn("The xmllib module is obsolete.  Use xml.sax instead.", DeprecationWarning)
  10 del warnings
  11
  12 version = '0.3'
  13
  14 class Error(RuntimeError):
  15     pass
  16
  17 # Regular expressions used for parsing
  18
  19 _S = '[ \t\r\n]+'                       # white space
  20 _opS = '[ \t\r\n]*'                     # optional white space
  21 _Name = '[a-zA-Z_:][-a-zA-Z0-9._:]*'    # valid XML name
  22 _QStr = "(?:'[^']*'|\"[^\"]*\")"        # quoted XML string
  23 illegal = re.compile('[^\t\r\n -\176\240-\377]') # illegal chars in content
  24 interesting = re.compile('[]&<]')
  25
  26 amp = re.compile('&')
  27 ref = re.compile('&(' + _Name + '|#[0-9]+|#x[0-9a-fA-F]+)[^-a-zA-Z0-9._:]')
  28 entityref = re.compile('&(?P<name>' + _Name + ')[^-a-zA-Z0-9._:]')
  29 charref = re.compile('&#(?P<char>[0-9]+[^0-9]|x[0-9a-fA-F]+[^0-9a-fA-F])')
  30 space = re.compile(_S + '$')
  31 newline = re.compile('\n')
  32
  33 attrfind = re.compile(
  34     _S + '(?P<name>' + _Name + ')'
  35     '(' + _opS + '=' + _opS +
  36     '(?P<value>'+_QStr+'|[-a-zA-Z0-9.:+*%?!\(\)_#=~]+))?')
  37 starttagopen = re.compile('<' + _Name)
  38 starttagend = re.compile(_opS + '(?P<slash>/?)>')
  39 starttagmatch = re.compile('<(?P<tagname>'+_Name+')'
  40                       '(?P<attrs>(?:'+attrfind.pattern+')*)'+
  41                       starttagend.pattern)
  42 endtagopen = re.compile('</')
  43 endbracket = re.compile(_opS + '>')
  44 endbracketfind = re.compile('(?:[^>\'"]|'+_QStr+')*>')
  45 tagfind = re.compile(_Name)
  46 cdataopen = re.compile(r'<!\[CDATA\[')
  47 cdataclose = re.compile(r'\]\]>')
  48 # this matches one of the following:
  49 # SYSTEM SystemLiteral
  50 # PUBLIC PubidLiteral SystemLiteral
  51 _SystemLiteral = '(?P<%s>'+_QStr+')'
  52 _PublicLiteral = '(?P<%s>"[-\'\(\)+,./:=?;!*#@$_%% \n\ra-zA-Z0-9]*"|' \
  53                         "'[-\(\)+,./:=?;!*#@$_%% \n\ra-zA-Z0-9]*')"
  54 _ExternalId = '(?:SYSTEM|' \
  55                  'PUBLIC'+_S+_PublicLiteral%'pubid'+ \
  56               ')'+_S+_SystemLiteral%'syslit'
  57 doctype = re.compile('<!DOCTYPE'+_S+'(?P<name>'+_Name+')'
  58                      '(?:'+_S+_ExternalId+')?'+_opS)
  59 xmldecl = re.compile('<\?xml'+_S+
  60                      'version'+_opS+'='+_opS+'(?P<version>'+_QStr+')'+
  61                      '(?:'+_S+'encoding'+_opS+'='+_opS+
  62                         "(?P<encoding>'[A-Za-z][-A-Za-z0-9._]*'|"
  63                         '"[A-Za-z][-A-Za-z0-9._]*"))?'
  64                      '(?:'+_S+'standalone'+_opS+'='+_opS+
  65                         '(?P<standalone>\'(?:yes|no)\'|"(?:yes|no)"))?'+
  66                      _opS+'\?>')
  67 procopen = re.compile(r'<\?(?P<proc>' + _Name + ')' + _opS)
  68 procclose = re.compile(_opS + r'\?>')
  69 commentopen = re.compile('<!--')
  70 commentclose = re.compile('-->')
  71 doubledash = re.compile('--')
  72 attrtrans = string.maketrans(' \r\n\t', '    ')
  73
  74 # definitions for XML namespaces
  75 _NCName = '[a-zA-Z_][-a-zA-Z0-9._]*'    # XML Name, minus the ":"
  76 ncname = re.compile(_NCName + '$')
  77 qname = re.compile('(?:(?P<prefix>' + _NCName + '):)?' # optional prefix
  78                    '(?P<local>' + _NCName + ')$')
  79
  80 xmlns = re.compile('xmlns(?::(?P<ncname>'+_NCName+'))?$')
  81
  82 # XML parser base class -- find tags and call handler functions.
  83 # Usage: p = XMLParser(); p.feed(data); ...; p.close().
  84 # The dtd is defined by deriving a class which defines methods with
  85 # special names to handle tags: start_foo and end_foo to handle <foo>
  86 # and </foo>, respectively.  The data between tags is passed to the
  87 # parser by calling self.handle_data() with some data as argument (the
  88 # data may be split up in arbitrary chunks).
  89
  90 class XMLParser:
  91     attributes = {}                     # default, to be overridden
  92     elements = {}                       # default, to be overridden
  93
  94     # parsing options, settable using keyword args in __init__
  95     __accept_unquoted_attributes = 0
  96     __accept_missing_endtag_name = 0
  97     __map_case = 0
  98     __accept_utf8 = 0
  99     __translate_attribute_references = 1
 100
 101     # Interface -- initialize and reset this instance
 102     def __init__(self, **kw):
 103         self.__fixed = 0
 104         if 'accept_unquoted_attributes' in kw:
 105             self.__accept_unquoted_attributes = kw['accept_unquoted_attributes']
 106         if 'accept_missing_endtag_name' in kw:
 107             self.__accept_missing_endtag_name = kw['accept_missing_endtag_name']
 108         if 'map_case' in kw:
 109             self.__map_case = kw['map_case']
 110         if 'accept_utf8' in kw:
 111             self.__accept_utf8 = kw['accept_utf8']
 112         if 'translate_attribute_references' in kw:
 113             self.__translate_attribute_references = kw['translate_attribute_references']
 114         self.reset()
 115
 116     def __fixelements(self):
 117         self.__fixed = 1
 118         self.elements = {}
 119         self.__fixdict(self.__dict__)
 120         self.__fixclass(self.__class__)
 121
 122     def __fixclass(self, kl):
 123         self.__fixdict(kl.__dict__)
 124         for k in kl.__bases__:
 125             self.__fixclass(k)
 126
 127     def __fixdict(self, dict):
 128         for key in dict.keys():
 129             if key[:6] == 'start_':
 130                 tag = key[6:]
 131                 start, end = self.elements.get(tag, (None, None))
 132                 if start is None:
 133                     self.elements[tag] = getattr(self, key), end
 134             elif key[:4] == 'end_':
 135                 tag = key[4:]
 136                 start, end = self.elements.get(tag, (None, None))
 137                 if end is None:
 138                     self.elements[tag] = start, getattr(self, key)
 139
 140     # Interface -- reset this instance.  Loses all unprocessed data
 141     def reset(self):
 142         self.rawdata = ''
 143         self.stack = []
 144         self.nomoretags = 0
 145         self.literal = 0
 146         self.lineno = 1
 147         self.__at_start = 1
 148         self.__seen_doctype = None
 149         self.__seen_starttag = 0
 150         self.__use_namespaces = 0
 151         self.__namespaces = {'xml':None}   # xml is implicitly declared
 152         # backward compatibility hack: if elements not overridden,
 153         # fill it in ourselves
 154         if self.elements is XMLParser.elements:
 155             self.__fixelements()
 156
 157     # For derived classes only -- enter literal mode (CDATA) till EOF
 158     def setnomoretags(self):
 159         self.nomoretags = self.literal = 1
 160
 161     # For derived classes only -- enter literal mode (CDATA)
 162     def setliteral(self, *args):
 163         self.literal = 1
 164
 165     # Interface -- feed some data to the parser.  Call this as
 166     # often as you want, with as little or as much text as you
 167     # want (may include '\n').  (This just saves the text, all the
 168     # processing is done by goahead().)
 169     def feed(self, data):
 170         self.rawdata = self.rawdata + data
 171         self.goahead(0)
 172
 173     # Interface -- handle the remaining data
 174     def close(self):
 175         self.goahead(1)
 176         if self.__fixed:
 177             self.__fixed = 0
 178             # remove self.elements so that we don't leak
 179             del self.elements
 180
 181     # Interface -- translate references
 182     def translate_references(self, data, all = 1):
 183         if not self.__translate_attribute_references:
 184             return data
 185         i = 0
 186         while 1:
 187             res = amp.search(data, i)
 188             if res is None:
 189                 return data
 190             s = res.start(0)
 191             res = ref.match(data, s)
 192             if res is None:
 193                 self.syntax_error("bogus `&'")
 194                 i = s+1
 195                 continue
 196             i = res.end(0)
 197             str = res.group(1)
 198             rescan = 0
 199             if str[0] == '#':
 200                 if str[1] == 'x':
 201                     str = chr(int(str[2:], 16))
 202                 else:
 203                     str = chr(int(str[1:]))
 204                 if data[i - 1] != ';':
 205                     self.syntax_error("`;' missing after char reference")
 206                     i = i-1
 207             elif all:
 208                 if str in self.entitydefs:
 209                     str = self.entitydefs[str]
 210                     rescan = 1
 211                 elif data[i - 1] != ';':
 212                     self.syntax_error("bogus `&'")
 213                     i = s + 1 # just past the &
 214                     continue
 215                 else:
 216                     self.syntax_error("reference to unknown entity `&%s;'" % str)
 217                     str = '&' + str + ';'
 218             elif data[i - 1] != ';':
 219                 self.syntax_error("bogus `&'")
 220                 i = s + 1 # just past the &
 221                 continue
 222
 223             # when we get here, str contains the translated text and i points
 224             # to the end of the string that is to be replaced
 225             data = data[:s] + str + data[i:]
 226             if rescan:
 227                 i = s
 228             else:
 229                 i = s + len(str)
 230
 231     # Interface - return a dictionary of all namespaces currently valid
 232     def getnamespace(self):
 233         nsdict = {}
 234         for t, d, nst in self.stack:
 235             nsdict.update(d)
 236         return nsdict
 237
 238     # Internal -- handle data as far as reasonable.  May leave state
 239     # and data to be processed by a subsequent call.  If 'end' is
 240     # true, force handling all data as if followed by EOF marker.
 241     def goahead(self, end):
 242         rawdata = self.rawdata
 243         i = 0
 244         n = len(rawdata)
 245         while i < n:
 246             if i > 0:
 247                 self.__at_start = 0
 248             if self.nomoretags:
 249                 data = rawdata[i:n]
 250                 self.handle_data(data)
 251                 self.lineno = self.lineno + data.count('\n')
 252                 i = n
 253                 break
 254             res = interesting.search(rawdata, i)
 255             if res:
 256                 j = res.start(0)
 257             else:
 258                 j = n
 259             if i < j:
 260                 data = rawdata[i:j]
 261                 if self.__at_start and space.match(data) is None:
 262                     self.syntax_error('illegal data at start of file')
 263                 self.__at_start = 0
 264                 if not self.stack and space.match(data) is None:
 265                     self.syntax_error('data not in content')
 266                 if not self.__accept_utf8 and illegal.search(data):
 267                     self.syntax_error('illegal character in content')
 268                 self.handle_data(data)
 269                 self.lineno = self.lineno + data.count('\n')
 270             i = j
 271             if i == n: break
 272             if rawdata[i] == '<':
 273                 if starttagopen.match(rawdata, i):
 274                     if self.literal:
 275                         data = rawdata[i]
 276                         self.handle_data(data)
 277                         self.lineno = self.lineno + data.count('\n')
 278                         i = i+1
 279                         continue
 280                     k = self.parse_starttag(i)
 281                     if k < 0: break
 282                     self.__seen_starttag = 1
 283                     self.lineno = self.lineno + rawdata[i:k].count('\n')
 284                     i = k
 285                     continue
 286                 if endtagopen.match(rawdata, i):
 287                     k = self.parse_endtag(i)
 288                     if k < 0: break
 289                     self.lineno = self.lineno + rawdata[i:k].count('\n')
 290                     i =  k
 291                     continue
 292                 if commentopen.match(rawdata, i):
 293                     if self.literal:
 294                         data = rawdata[i]
 295                         self.handle_data(data)
 296                         self.lineno = self.lineno + data.count('\n')
 297                         i = i+1
 298                         continue
 299                     k = self.parse_comment(i)
 300                     if k < 0: break
 301                     self.lineno = self.lineno + rawdata[i:k].count('\n')
 302                     i = k
 303                     continue
 304                 if cdataopen.match(rawdata, i):
 305                     k = self.parse_cdata(i)
 306                     if k < 0: break
 307                     self.lineno = self.lineno + rawdata[i:k].count('\n')
 308                     i = k
 309                     continue
 310                 res = xmldecl.match(rawdata, i)
 311                 if res:
 312                     if not self.__at_start:
 313                         self.syntax_error("<?xml?> declaration not at start of document")
 314                     version, encoding, standalone = res.group('version',
 315                                                               'encoding',
 316                                                               'standalone')
 317                     if version[1:-1] != '1.0':
 318                         raise Error('only XML version 1.0 supported')
 319                     if encoding: encoding = encoding[1:-1]
 320                     if standalone: standalone = standalone[1:-1]
 321                     self.handle_xml(encoding, standalone)
 322                     i = res.end(0)
 323                     continue
 324                 res = procopen.match(rawdata, i)
 325                 if res:
 326                     k = self.parse_proc(i)
 327                     if k < 0: break
 328                     self.lineno = self.lineno + rawdata[i:k].count('\n')
 329                     i = k
 330                     continue
 331                 res = doctype.match(rawdata, i)
 332                 if res:
 333                     if self.literal:
 334                         data = rawdata[i]
 335                         self.handle_data(data)
 336                         self.lineno = self.lineno + data.count('\n')
 337                         i = i+1
 338                         continue
 339                     if self.__seen_doctype:
 340                         self.syntax_error('multiple DOCTYPE elements')
 341                     if self.__seen_starttag:
 342                         self.syntax_error('DOCTYPE not at beginning of document')
 343                     k = self.parse_doctype(res)
 344                     if k < 0: break
 345                     self.__seen_doctype = res.group('name')
 346                     if self.__map_case:
 347                         self.__seen_doctype = self.__seen_doctype.lower()
 348                     self.lineno = self.lineno + rawdata[i:k].count('\n')
 349                     i = k
 350                     continue
 351             elif rawdata[i] == '&':
 352                 if self.literal:
 353                     data = rawdata[i]
 354                     self.handle_data(data)
 355                     i = i+1
 356                     continue
 357                 res = charref.match(rawdata, i)
 358                 if res is not None:
 359                     i = res.end(0)
 360                     if rawdata[i-1] != ';':
 361                         self.syntax_error("`;' missing in charref")
 362                         i = i-1
 363                     if not self.stack:
 364                         self.syntax_error('data not in content')
 365                     self.handle_charref(res.group('char')[:-1])
 366                     self.lineno = self.lineno + res.group(0).count('\n')
 367                     continue
 368                 res = entityref.match(rawdata, i)
 369                 if res is not None:
 370                     i = res.end(0)
 371                     if rawdata[i-1] != ';':
 372                         self.syntax_error("`;' missing in entityref")
 373                         i = i-1
 374                     name = res.group('name')
 375                     if self.__map_case:
 376                         name = name.lower()
 377                     if name in self.entitydefs:
 378                         self.rawdata = rawdata = rawdata[:res.start(0)] + self.entitydefs[name] + rawdata[i:]
 379                         n = len(rawdata)
 380                         i = res.start(0)
 381                     else:
 382                         self.unknown_entityref(name)
 383                     self.lineno = self.lineno + res.group(0).count('\n')
 384                     continue
 385             elif rawdata[i] == ']':
 386                 if self.literal:
 387                     data = rawdata[i]
 388                     self.handle_data(data)
 389                     i = i+1
 390                     continue
 391                 if n-i < 3:
 392                     break
 393                 if cdataclose.match(rawdata, i):
 394                     self.syntax_error("bogus `]]>'")
 395                 self.handle_data(rawdata[i])
 396                 i = i+1
 397                 continue
 398             else:
 399                 raise Error('neither < nor & ??')
 400             # We get here only if incomplete matches but
 401             # nothing else
 402             break
 403         # end while
 404         if i > 0:
 405             self.__at_start = 0
 406         if end and i < n:
 407             data = rawdata[i]
 408             self.syntax_error("bogus `%s'" % data)
 409             if not self.__accept_utf8 and illegal.search(data):
 410                 self.syntax_error('illegal character in content')
 411             self.handle_data(data)
 412             self.lineno = self.lineno + data.count('\n')
 413             self.rawdata = rawdata[i+1:]
 414             return self.goahead(end)
 415         self.rawdata = rawdata[i:]
 416         if end:
 417             if not self.__seen_starttag:
 418                 self.syntax_error('no elements in file')
 419             if self.stack:
 420                 self.syntax_error('missing end tags')
 421                 while self.stack:
 422                     self.finish_endtag(self.stack[-1][0])
 423
 424     # Internal -- parse comment, return length or -1 if not terminated
 425     def parse_comment(self, i):
 426         rawdata = self.rawdata
 427         if rawdata[i:i+4] != '<!--':
 428             raise Error('unexpected call to handle_comment')
 429         res = commentclose.search(rawdata, i+4)
 430         if res is None:
 431             return -1
 432         if doubledash.search(rawdata, i+4, res.start(0)):
 433             self.syntax_error("`--' inside comment")
 434         if rawdata[res.start(0)-1] == '-':
 435             self.syntax_error('comment cannot end in three dashes')
 436         if not self.__accept_utf8 and \
 437            illegal.search(rawdata, i+4, res.start(0)):
 438             self.syntax_error('illegal character in comment')
 439         self.handle_comment(rawdata[i+4: res.start(0)])
 440         return res.end(0)
 441
 442     # Internal -- handle DOCTYPE tag, return length or -1 if not terminated
 443     def parse_doctype(self, res):
 444         rawdata = self.rawdata
 445         n = len(rawdata)
 446         name = res.group('name')
 447         if self.__map_case:
 448             name = name.lower()
 449         pubid, syslit = res.group('pubid', 'syslit')
 450         if pubid is not None:
 451             pubid = pubid[1:-1]         # remove quotes
 452             pubid = ' '.join(pubid.split()) # normalize
 453         if syslit is not None: syslit = syslit[1:-1] # remove quotes
 454         j = k = res.end(0)
 455         if k >= n:
 456             return -1
 457         if rawdata[k] == '[':
 458             level = 0
 459             k = k+1
 460             dq = sq = 0
 461             while k < n:
 462                 c = rawdata[k]
 463                 if not sq and c == '"':
 464                     dq = not dq
 465                 elif not dq and c == "'":
 466                     sq = not sq
 467                 elif sq or dq:
 468                     pass
 469                 elif level <= 0 and c == ']':
 470                     res = endbracket.match(rawdata, k+1)
 471                     if res is None:
 472                         return -1
 473                     self.handle_doctype(name, pubid, syslit, rawdata[j+1:k])
 474                     return res.end(0)
 475                 elif c == '<':
 476                     level = level + 1
 477                 elif c == '>':
 478                     level = level - 1
 479                     if level < 0:
 480                         self.syntax_error("bogus `>' in DOCTYPE")
 481                 k = k+1
 482         res = endbracketfind.match(rawdata, k)
 483         if res is None:
 484             return -1
 485         if endbracket.match(rawdata, k) is None:
 486             self.syntax_error('garbage in DOCTYPE')
 487         self.handle_doctype(name, pubid, syslit, None)
 488         return res.end(0)
 489
 490     # Internal -- handle CDATA tag, return length or -1 if not terminated
 491     def parse_cdata(self, i):
 492         rawdata = self.rawdata
 493         if rawdata[i:i+9] != '<![CDATA[':
 494             raise Error('unexpected call to parse_cdata')
 495         res = cdataclose.search(rawdata, i+9)
 496         if res is None:
 497             return -1
 498         if not self.__accept_utf8 and \
 499            illegal.search(rawdata, i+9, res.start(0)):
 500             self.syntax_error('illegal character in CDATA')
 501         if not self.stack:
 502             self.syntax_error('CDATA not in content')
 503         self.handle_cdata(rawdata[i+9:res.start(0)])
 504         return res.end(0)
 505
 506     __xml_namespace_attributes = {'ns':None, 'src':None, 'prefix':None}
 507     # Internal -- handle a processing instruction tag
 508     def parse_proc(self, i):
 509         rawdata = self.rawdata
 510         end = procclose.search(rawdata, i)
 511         if end is None:
 512             return -1
 513         j = end.start(0)
 514         if not self.__accept_utf8 and illegal.search(rawdata, i+2, j):
 515             self.syntax_error('illegal character in processing instruction')
 516         res = tagfind.match(rawdata, i+2)
 517         if res is None:
 518             raise Error('unexpected call to parse_proc')
 519         k = res.end(0)
 520         name = res.group(0)
 521         if self.__map_case:
 522             name = name.lower()
 523         if name == 'xml:namespace':
 524             self.syntax_error('old-fashioned namespace declaration')
 525             self.__use_namespaces = -1
 526             # namespace declaration
 527             # this must come after the <?xml?> declaration (if any)
 528             # and before the <!DOCTYPE> (if any).
 529             if self.__seen_doctype or self.__seen_starttag:
 530                 self.syntax_error('xml:namespace declaration too late in document')
 531             attrdict, namespace, k = self.parse_attributes(name, k, j)
 532             if namespace:
 533                 self.syntax_error('namespace declaration inside namespace declaration')
 534             for attrname in attrdict.keys():
 535                 if not attrname in self.__xml_namespace_attributes:
 536                     self.syntax_error("unknown attribute `%s' in xml:namespace tag" % attrname)
 537             if not 'ns' in attrdict or not 'prefix' in attrdict:
 538                 self.syntax_error('xml:namespace without required attributes')
 539             prefix = attrdict.get('prefix')
 540             if ncname.match(prefix) is None:
 541                 self.syntax_error('xml:namespace illegal prefix value')
 542                 return end.end(0)
 543             if prefix in self.__namespaces:
 544                 self.syntax_error('xml:namespace prefix not unique')
 545             self.__namespaces[prefix] = attrdict['ns']
 546         else:
 547             if name.lower() == 'xml':
 548                 self.syntax_error('illegal processing instruction target name')
 549             self.handle_proc(name, rawdata[k:j])
 550         return end.end(0)
 551
 552     # Internal -- parse attributes between i and j
 553     def parse_attributes(self, tag, i, j):
 554         rawdata = self.rawdata
 555         attrdict = {}
 556         namespace = {}
 557         while i < j:
 558             res = attrfind.match(rawdata, i)
 559             if res is None:
 560                 break
 561             attrname, attrvalue = res.group('name', 'value')
 562             if self.__map_case:
 563                 attrname = attrname.lower()
 564             i = res.end(0)
 565             if attrvalue is None:
 566                 self.syntax_error("no value specified for attribute `%s'" % attrname)
 567                 attrvalue = attrname
 568             elif attrvalue[:1] == "'" == attrvalue[-1:] or \
 569                  attrvalue[:1] == '"' == attrvalue[-1:]:
 570                 attrvalue = attrvalue[1:-1]
 571             elif not self.__accept_unquoted_attributes:
 572                 self.syntax_error("attribute `%s' value not quoted" % attrname)
 573             res = xmlns.match(attrname)
 574             if res is not None:
 575                 # namespace declaration
 576                 ncname = res.group('ncname')
 577                 namespace[ncname or ''] = attrvalue or None
 578                 if not self.__use_namespaces:
 579                     self.__use_namespaces = len(self.stack)+1
 580                 continue
 581             if '<' in attrvalue:
 582                 self.syntax_error("`<' illegal in attribute value")
 583             if attrname in attrdict:
 584                 self.syntax_error("attribute `%s' specified twice" % attrname)
 585             attrvalue = attrvalue.translate(attrtrans)
 586             attrdict[attrname] = self.translate_references(attrvalue)
 587         return attrdict, namespace, i
 588
 589     # Internal -- handle starttag, return length or -1 if not terminated
 590     def parse_starttag(self, i):
 591         rawdata = self.rawdata
 592         # i points to start of tag
 593         end = endbracketfind.match(rawdata, i+1)
 594         if end is None:
 595             return -1
 596         tag = starttagmatch.match(rawdata, i)
 597         if tag is None or tag.end(0) != end.end(0):
 598             self.syntax_error('garbage in starttag')
 599             return end.end(0)
 600         nstag = tagname = tag.group('tagname')
 601         if self.__map_case:
 602             nstag = tagname = nstag.lower()
 603         if not self.__seen_starttag and self.__seen_doctype and \
 604            tagname != self.__seen_doctype:
 605             self.syntax_error('starttag does not match DOCTYPE')
 606         if self.__seen_starttag and not self.stack:
 607             self.syntax_error('multiple elements on top level')
 608         k, j = tag.span('attrs')
 609         attrdict, nsdict, k = self.parse_attributes(tagname, k, j)
 610         self.stack.append((tagname, nsdict, nstag))
 611         if self.__use_namespaces:
 612             res = qname.match(tagname)
 613         else:
 614             res = None
 615         if res is not None:
 616             prefix, nstag = res.group('prefix', 'local')
 617             if prefix is None:
 618                 prefix = ''
 619             ns = None
 620             for t, d, nst in self.stack:
 621                 if prefix in d:
 622                     ns = d[prefix]
 623             if ns is None and prefix != '':
 624                 ns = self.__namespaces.get(prefix)
 625             if ns is not None:
 626                 nstag = ns + ' ' + nstag
 627             elif prefix != '':
 628                 nstag = prefix + ':' + nstag # undo split
 629             self.stack[-1] = tagname, nsdict, nstag
 630         # translate namespace of attributes
 631         attrnamemap = {} # map from new name to old name (used for error reporting)
 632         for key in attrdict.keys():
 633             attrnamemap[key] = key
 634         if self.__use_namespaces:
 635             nattrdict = {}
 636             for key, val in attrdict.items():
 637                 okey = key
 638                 res = qname.match(key)
 639                 if res is not None:
 640                     aprefix, key = res.group('prefix', 'local')
 641                     if self.__map_case:
 642                         key = key.lower()
 643                     if aprefix is not None:
 644                         ans = None
 645                         for t, d, nst in self.stack:
 646                             if aprefix in d:
 647                                 ans = d[aprefix]
 648                         if ans is None:
 649                             ans = self.__namespaces.get(aprefix)
 650                         if ans is not None:
 651                             key = ans + ' ' + key
 652                         else:
 653                             key = aprefix + ':' + key
 654                 nattrdict[key] = val
 655                 attrnamemap[key] = okey
 656             attrdict = nattrdict
 657         attributes = self.attributes.get(nstag)
 658         if attributes is not None:
 659             for key in attrdict.keys():
 660                 if not key in attributes:
 661                     self.syntax_error("unknown attribute `%s' in tag `%s'" % (attrnamemap[key], tagname))
 662             for key, val in attributes.items():
 663                 if val is not None and not key in attrdict:
 664                     attrdict[key] = val
 665         method = self.elements.get(nstag, (None, None))[0]
 666         self.finish_starttag(nstag, attrdict, method)
 667         if tag.group('slash') == '/':
 668             self.finish_endtag(tagname)
 669         return tag.end(0)
 670
 671     # Internal -- parse endtag
 672     def parse_endtag(self, i):
 673         rawdata = self.rawdata
 674         end = endbracketfind.match(rawdata, i+1)
 675         if end is None:
 676             return -1
 677         res = tagfind.match(rawdata, i+2)
 678         if res is None:
 679             if self.literal:
 680                 self.handle_data(rawdata[i])
 681                 return i+1
 682             if not self.__accept_missing_endtag_name:
 683                 self.syntax_error('no name specified in end tag')
 684             tag = self.stack[-1][0]
 685             k = i+2
 686         else:
 687             tag = res.group(0)
 688             if self.__map_case:
 689                 tag = tag.lower()
 690             if self.literal:
 691                 if not self.stack or tag != self.stack[-1][0]:
 692                     self.handle_data(rawdata[i])
 693                     return i+1
 694             k = res.end(0)
 695         if endbracket.match(rawdata, k) is None:
 696             self.syntax_error('garbage in end tag')
 697         self.finish_endtag(tag)
 698         return end.end(0)
 699
 700     # Internal -- finish processing of start tag
 701     def finish_starttag(self, tagname, attrdict, method):
 702         if method is not None:
 703             self.handle_starttag(tagname, method, attrdict)
 704         else:
 705             self.unknown_starttag(tagname, attrdict)
 706
 707     # Internal -- finish processing of end tag
 708     def finish_endtag(self, tag):
 709         self.literal = 0
 710         if not tag:
 711             self.syntax_error('name-less end tag')
 712             found = len(self.stack) - 1
 713             if found < 0:
 714                 self.unknown_endtag(tag)
 715                 return
 716         else:
 717             found = -1
 718             for i in range(len(self.stack)):
 719                 if tag == self.stack[i][0]:
 720                     found = i
 721             if found == -1:
 722                 self.syntax_error('unopened end tag')
 723                 return
 724         while len(self.stack) > found:
 725             if found < len(self.stack) - 1:
 726                 self.syntax_error('missing close tag for %s' % self.stack[-1][2])
 727             nstag = self.stack[-1][2]
 728             method = self.elements.get(nstag, (None, None))[1]
 729             if method is not None:
 730                 self.handle_endtag(nstag, method)
 731             else:
 732                 self.unknown_endtag(nstag)
 733             if self.__use_namespaces == len(self.stack):
 734                 self.__use_namespaces = 0
 735             del self.stack[-1]
 736
 737     # Overridable -- handle xml processing instruction
 738     def handle_xml(self, encoding, standalone):
 739         pass
 740
 741     # Overridable -- handle DOCTYPE
 742     def handle_doctype(self, tag, pubid, syslit, data):
 743         pass
 744
 745     # Overridable -- handle start tag
 746     def handle_starttag(self, tag, method, attrs):
 747         method(attrs)
 748
 749     # Overridable -- handle end tag
 750     def handle_endtag(self, tag, method):
 751         method()
 752
 753     # Example -- handle character reference, no need to override
 754     def handle_charref(self, name):
 755         try:
 756             if name[0] == 'x':
 757                 n = int(name[1:], 16)
 758             else:
 759                 n = int(name)
 760         except ValueError:
 761             self.unknown_charref(name)
 762             return
 763         if not 0 <= n <= 255:
 764             self.unknown_charref(name)
 765             return
 766         self.handle_data(chr(n))
 767
 768     # Definition of entities -- derived classes may override
 769     entitydefs = {'lt': '&#60;',        # must use charref
 770                   'gt': '&#62;',
 771                   'amp': '&#38;',       # must use charref
 772                   'quot': '&#34;',
 773                   'apos': '&#39;',
 774                   }
 775
 776     # Example -- handle data, should be overridden
 777     def handle_data(self, data):
 778         pass
 779
 780     # Example -- handle cdata, could be overridden
 781     def handle_cdata(self, data):
 782         pass
 783
 784     # Example -- handle comment, could be overridden
 785     def handle_comment(self, data):
 786         pass
 787
 788     # Example -- handle processing instructions, could be overridden
 789     def handle_proc(self, name, data):
 790         pass
 791
 792     # Example -- handle relatively harmless syntax errors, could be overridden
 793     def syntax_error(self, message):
 794         raise Error('Syntax error at line %d: %s' % (self.lineno, message))
 795
 796     # To be overridden -- handlers for unknown objects
 797     def unknown_starttag(self, tag, attrs): pass
 798     def unknown_endtag(self, tag): pass
 799     def unknown_charref(self, ref): pass
 800     def unknown_entityref(self, name):
 801         self.syntax_error("reference to unknown entity `&%s;'" % name)
 802
 803
 804 class TestXMLParser(XMLParser):
 805
 806     def __init__(self, **kw):
 807         self.testdata = ""
 808         XMLParser.__init__(self, **kw)
 809
 810     def handle_xml(self, encoding, standalone):
 811         self.flush()
 812         print 'xml: encoding =',encoding,'standalone =',standalone
 813
 814     def handle_doctype(self, tag, pubid, syslit, data):
 815         self.flush()
 816         print 'DOCTYPE:',tag, repr(data)
 817
 818     def handle_data(self, data):
 819         self.testdata = self.testdata + data
 820         if len(repr(self.testdata)) >= 70:
 821             self.flush()
 822
 823     def flush(self):
 824         data = self.testdata
 825         if data:
 826             self.testdata = ""
 827             print 'data:', repr(data)
 828
 829     def handle_cdata(self, data):
 830         self.flush()
 831         print 'cdata:', repr(data)
 832
 833     def handle_proc(self, name, data):
 834         self.flush()
 835         print 'processing:',name,repr(data)
 836
 837     def handle_comment(self, data):
 838         self.flush()
 839         r = repr(data)
 840         if len(r) > 68:
 841             r = r[:32] + '...' + r[-32:]
 842         print 'comment:', r
 843
 844     def syntax_error(self, message):
 845         print 'error at line %d:' % self.lineno, message
 846
 847     def unknown_starttag(self, tag, attrs):
 848         self.flush()
 849         if not attrs:
 850             print 'start tag: <' + tag + '>'
 851         else:
 852             print 'start tag: <' + tag,
 853             for name, value in attrs.items():
 854                 print name + '=' + '"' + value + '"',
 855             print '>'
 856
 857     def unknown_endtag(self, tag):
 858         self.flush()
 859         print 'end tag: </' + tag + '>'
 860
 861     def unknown_entityref(self, ref):
 862         self.flush()
 863         print '*** unknown entity ref: &' + ref + ';'
 864
 865     def unknown_charref(self, ref):
 866         self.flush()
 867         print '*** unknown char ref: &#' + ref + ';'
 868
 869     def close(self):
 870         XMLParser.close(self)
 871         self.flush()
 872
 873 def test(args = None):
 874     import sys, getopt
 875     from time import time
 876
 877     if not args:
 878         args = sys.argv[1:]
 879
 880     opts, args = getopt.getopt(args, 'st')
 881     klass = TestXMLParser
 882     do_time = 0
 883     for o, a in opts:
 884         if o == '-s':
 885             klass = XMLParser
 886         elif o == '-t':
 887             do_time = 1
 888
 889     if args:
 890         file = args[0]
 891     else:
 892         file = 'test.xml'
 893
 894     if file == '-':
 895         f = sys.stdin
 896     else:
 897         try:
 898             f = open(file, 'r')
 899         except IOError, msg:
 900             print file, ":", msg
 901             sys.exit(1)
 902
 903     data = f.read()
 904     if f is not sys.stdin:
 905         f.close()
 906
 907     x = klass()
 908     t0 = time()
 909     try:
 910         if do_time:
 911             x.feed(data)
 912             x.close()
 913         else:
 914             for c in data:
 915                 x.feed(c)
 916             x.close()
 917     except Error, msg:
 918         t1 = time()
 919         print msg
 920         if do_time:
 921             print 'total time: %g' % (t1-t0)
 922         sys.exit(1)
 923     t1 = time()
 924     if do_time:
 925         print 'total time: %g' % (t1-t0)
 926
 927
 928 if __name__ == '__main__':
 929     test()