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747 lines
27 KiB
Python
747 lines
27 KiB
Python
# A parser for XML, using the derived class as static DTD.
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# Author: Sjoerd Mullender.
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import re
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import string
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version = '0.1'
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# Regular expressions used for parsing
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_S = '[ \t\r\n]+'
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_opS = '[ \t\r\n]*'
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_Name = '[a-zA-Z_:][-a-zA-Z0-9._:]*'
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illegal = re.compile('[^\t\r\n -\176\240-\377]') # illegal chars in content
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interesting = re.compile('[]&<]')
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amp = re.compile('&')
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ref = re.compile('&(' + _Name + '|#[0-9]+|#x[0-9a-fA-F]+)[^-a-zA-Z0-9._:]')
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entityref = re.compile('&(?P<name>' + _Name + ')[^-a-zA-Z0-9._:]')
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charref = re.compile('&#(?P<char>[0-9]+[^0-9]|x[0-9a-fA-F]+[^0-9a-fA-F])')
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space = re.compile(_S + '$')
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newline = re.compile('\n')
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starttagopen = re.compile('<' + _Name)
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endtagopen = re.compile('</')
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starttagend = re.compile(_opS + '(?P<slash>/?)>')
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endbracket = re.compile(_opS + '>')
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tagfind = re.compile(_Name)
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cdataopen = re.compile(r'<!\[CDATA\[')
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cdataclose = re.compile(r'\]\]>')
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# this matches one of the following:
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# SYSTEM SystemLiteral
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# PUBLIC PubidLiteral SystemLiteral
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_SystemLiteral = '(?P<%s>\'[^\']*\'|"[^"]*")'
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_PublicLiteral = '(?P<%s>"[-\'()+,./:=?;!*#@$_%% \n\ra-zA-Z0-9]*"|' \
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"'[-()+,./:=?;!*#@$_%% \n\ra-zA-Z0-9]*')"
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_ExternalId = '(?:SYSTEM|' \
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'PUBLIC'+_S+_PublicLiteral%'pubid'+ \
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')'+_S+_SystemLiteral%'syslit'
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doctype = re.compile('<!DOCTYPE'+_S+'(?P<name>'+_Name+')'
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'(?:'+_S+_ExternalId+')?'+_opS)
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xmldecl = re.compile('<\?xml'+_S+
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'version'+_opS+'='+_opS+'(?P<version>\'[^\']*\'|"[^"]*")'+
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'(?:'+_S+'encoding'+_opS+'='+_opS+
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"(?P<encoding>'[A-Za-z][-A-Za-z0-9._]*'|"
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'"[A-Za-z][-A-Za-z0-9._]*"))?'
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'(?:'+_S+'standalone'+_opS+'='+_opS+
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'(?P<standalone>\'(?:yes|no)\'|"(?:yes|no)"))?'+
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_opS+'\?>')
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procopen = re.compile(r'<\?(?P<proc>' + _Name + ')' + _opS)
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procclose = re.compile(_opS + r'\?>')
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commentopen = re.compile('<!--')
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commentclose = re.compile('-->')
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doubledash = re.compile('--')
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attrfind = re.compile(
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_S + '(?P<name>' + _Name + ')'
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'(' + _opS + '=' + _opS +
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'(?P<value>\'[^\']*\'|"[^"]*"|[-a-zA-Z0-9.:+*%?!()_#=~]+))')
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attrtrans = string.maketrans(' \r\n\t', ' ')
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# XML parser base class -- find tags and call handler functions.
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# Usage: p = XMLParser(); p.feed(data); ...; p.close().
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# The dtd is defined by deriving a class which defines methods with
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# special names to handle tags: start_foo and end_foo to handle <foo>
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# and </foo>, respectively. The data between tags is passed to the
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# parser by calling self.handle_data() with some data as argument (the
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# data may be split up in arbutrary chunks). Entity references are
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# passed by calling self.handle_entityref() with the entity reference
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# as argument.
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class XMLParser:
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# Interface -- initialize and reset this instance
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def __init__(self, verbose=0):
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self.verbose = verbose
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self.reset()
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# Interface -- reset this instance. Loses all unprocessed data
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def reset(self):
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self.rawdata = ''
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self.stack = []
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self.nomoretags = 0
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self.literal = 0
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self.lineno = 1
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self.__at_start = 1
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self.__seen_doctype = None
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self.__seen_starttag = 0
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# For derived classes only -- enter literal mode (CDATA) till EOF
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def setnomoretags(self):
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self.nomoretags = self.literal = 1
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# For derived classes only -- enter literal mode (CDATA)
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def setliteral(self, *args):
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self.literal = 1
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# Interface -- feed some data to the parser. Call this as
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# often as you want, with as little or as much text as you
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# want (may include '\n'). (This just saves the text, all the
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# processing is done by goahead().)
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def feed(self, data):
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self.rawdata = self.rawdata + data
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self.goahead(0)
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# Interface -- handle the remaining data
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def close(self):
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self.goahead(1)
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# Interface -- translate references
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def translate_references(self, data, all = 1):
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i = 0
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while 1:
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res = amp.search(data, i)
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if res is None:
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return data
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res = ref.match(data, res.start(0))
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if res is None:
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self.syntax_error("bogus `&'")
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i =i+1
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continue
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i = res.end(0)
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if data[i - 1] != ';':
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self.syntax_error("`;' missing after entity/char reference")
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i = i-1
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str = res.group(1)
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pre = data[:res.start(0)]
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post = data[i:]
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if str[0] == '#':
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if str[1] == 'x':
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str = chr(string.atoi(str[2:], 16))
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else:
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str = chr(string.atoi(str[1:]))
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data = pre + str + post
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i = res.start(0)+len(str)
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elif all:
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if self.entitydefs.has_key(str):
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data = pre + self.entitydefs[str] + post
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i = res.start(0) # rescan substituted text
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else:
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self.syntax_error('reference to unknown entity')
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# can't do it, so keep the entity ref in
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data = pre + '&' + str + ';' + post
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i = res.start(0) + len(str) + 2
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else:
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# just translating character references
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pass # i is already postioned correctly
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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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if i > 0:
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self.__at_start = 0
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if self.nomoretags:
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data = rawdata[i:n]
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self.handle_data(data)
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self.lineno = self.lineno + string.count(data, '\n')
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i = n
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break
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res = interesting.search(rawdata, i)
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if res:
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j = res.start(0)
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else:
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j = n
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if i < j:
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if self.__at_start:
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self.syntax_error('illegal data at start of file')
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self.__at_start = 0
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data = rawdata[i:j]
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if not self.stack and not space.match(data):
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self.syntax_error('data not in content')
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if illegal.search(data):
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self.syntax_error('illegal character in content')
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self.handle_data(data)
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self.lineno = self.lineno + string.count(data, '\n')
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i = j
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if i == n: break
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if rawdata[i] == '<':
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if starttagopen.match(rawdata, i):
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if self.literal:
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data = rawdata[i]
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self.handle_data(data)
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self.lineno = self.lineno + string.count(data, '\n')
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i = i+1
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continue
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k = self.parse_starttag(i)
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if k < 0: break
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self.__seen_starttag = 1
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self.lineno = self.lineno + string.count(rawdata[i:k], '\n')
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i = k
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continue
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if endtagopen.match(rawdata, i):
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k = self.parse_endtag(i)
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if k < 0: break
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self.lineno = self.lineno + string.count(rawdata[i:k], '\n')
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i = k
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self.literal = 0
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continue
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if commentopen.match(rawdata, i):
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if self.literal:
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data = rawdata[i]
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self.handle_data(data)
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self.lineno = self.lineno + string.count(data, '\n')
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i = i+1
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continue
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k = self.parse_comment(i)
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if k < 0: break
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self.lineno = self.lineno + string.count(rawdata[i:k], '\n')
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i = k
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continue
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if cdataopen.match(rawdata, i):
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k = self.parse_cdata(i)
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if k < 0: break
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self.lineno = self.lineno + string.count(rawdata[i:i], '\n')
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i = k
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continue
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res = xmldecl.match(rawdata, i)
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if res:
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if not self.__at_start:
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self.syntax_error("<?xml?> declaration not at start of document")
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version, encoding, standalone = res.group('version',
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'encoding',
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'standalone')
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if version[1:-1] != '1.0':
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raise RuntimeError, 'only XML version 1.0 supported'
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if encoding: encoding = encoding[1:-1]
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if standalone: standalone = standalone[1:-1]
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self.handle_xml(encoding, standalone)
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i = res.end(0)
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continue
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res = procopen.match(rawdata, i)
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if res:
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k = self.parse_proc(i)
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if k < 0: break
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self.lineno = self.lineno + string.count(rawdata[i:k], '\n')
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i = k
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continue
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res = doctype.match(rawdata, i)
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if res:
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if self.literal:
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data = rawdata[i]
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self.handle_data(data)
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self.lineno = self.lineno + string.count(data, '\n')
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i = i+1
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continue
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if self.__seen_doctype:
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self.syntax_error('multiple DOCTYPE elements')
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if self.__seen_starttag:
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self.syntax_error('DOCTYPE not at beginning of document')
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k = self.parse_doctype(res)
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if k < 0: break
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self.__seen_doctype = res.group('name')
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self.lineno = self.lineno + string.count(rawdata[i:k], '\n')
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i = k
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continue
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elif rawdata[i] == '&':
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res = charref.match(rawdata, i)
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if res is not None:
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i = res.end(0)
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if rawdata[i-1] != ';':
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self.syntax_error("`;' missing in charref")
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i = i-1
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if not self.stack:
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self.syntax_error('data not in content')
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self.handle_charref(res.group('char')[:-1])
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self.lineno = self.lineno + string.count(res.group(0), '\n')
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continue
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res = entityref.match(rawdata, i)
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if res is not None:
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i = res.end(0)
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if rawdata[i-1] != ';':
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self.syntax_error("`;' missing in entityref")
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i = i-1
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name = res.group('name')
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if self.entitydefs.has_key(name):
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self.rawdata = rawdata = rawdata[:res.start(0)] + self.entitydefs[name] + rawdata[i:]
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n = len(rawdata)
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i = res.start(0)
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else:
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self.syntax_error('reference to unknown entity')
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self.unknown_entityref(name)
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self.lineno = self.lineno + string.count(res.group(0), '\n')
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continue
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elif rawdata[i] == ']':
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if n-i < 3:
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break
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if cdataclose.match(rawdata, i):
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self.syntax_error("bogus `]]>'")
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self.handle_data(rawdata[i])
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i = i+1
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continue
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else:
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raise RuntimeError, 'neither < nor & ??'
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# We get here only if incomplete matches but
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# nothing else
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break
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# end while
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if i > 0:
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self.__at_start = 0
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if end and i < n:
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data = rawdata[i]
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self.syntax_error("bogus `%s'" % data)
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if illegal.search(data):
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self.syntax_error('illegal character in content')
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self.handle_data(data)
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self.lineno = self.lineno + string.count(data, '\n')
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self.rawdata = rawdata[i+1:]
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return self.goahead(end)
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self.rawdata = rawdata[i:]
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if end:
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if not self.__seen_starttag:
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self.syntax_error('no elements in file')
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if self.stack:
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self.syntax_error('missing end tags')
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while self.stack:
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self.finish_endtag(self.stack[-1])
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# Internal -- parse comment, return length or -1 if not terminated
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def parse_comment(self, i):
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rawdata = self.rawdata
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if rawdata[i:i+4] <> '<!--':
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raise RuntimeError, 'unexpected call to handle_comment'
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res = commentclose.search(rawdata, i+4)
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if not res:
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return -1
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if doubledash.search(rawdata, i+4, res.start(0)):
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self.syntax_error("`--' inside comment")
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if rawdata[res.start(0)-1] == '-':
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self.syntax_error('comment cannot end in three dashes')
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if illegal.search(rawdata, i+4, res.start(0)):
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self.syntax_error('illegal character in comment')
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self.handle_comment(rawdata[i+4: res.start(0)])
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return res.end(0)
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# Internal -- handle DOCTYPE tag, return length or -1 if not terminated
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def parse_doctype(self, res):
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rawdata = self.rawdata
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n = len(rawdata)
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name = res.group('name')
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pubid, syslit = res.group('pubid', 'syslit')
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if pubid is not None:
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pubid = pubid[1:-1] # remove quotes
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pubid = string.join(string.split(pubid)) # normalize
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if syslit is not None: syslit = syslit[1:-1] # remove quotes
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j = k = res.end(0)
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if k >= n:
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return -1
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if rawdata[k] == '[':
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level = 0
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k = k+1
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dq = sq = 0
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while k < n:
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c = rawdata[k]
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if not sq and c == '"':
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dq = not dq
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elif not dq and c == "'":
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sq = not sq
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elif sq or dq:
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pass
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elif level <= 0 and c == ']':
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res = endbracket.match(rawdata, k+1)
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if not res:
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return -1
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self.handle_doctype(name, pubid, syslit, rawdata[j+1:k])
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return res.end(0)
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elif c == '<':
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level = level + 1
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elif c == '>':
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level = level - 1
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if level < 0:
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self.syntax_error("bogus `>' in DOCTYPE")
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k = k+1
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res = endbracket.search(rawdata, k)
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if not res:
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return -1
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if res.start(0) != k:
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self.syntax_error('garbage in DOCTYPE')
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self.handle_doctype(name, pubid, syslit, None)
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return res.end(0)
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# Internal -- handle CDATA tag, return length or -1 if not terminated
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def parse_cdata(self, i):
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rawdata = self.rawdata
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if rawdata[i:i+9] <> '<![CDATA[':
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raise RuntimeError, 'unexpected call to parse_cdata'
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res = cdataclose.search(rawdata, i+9)
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if not res:
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return -1
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if illegal.search(rawdata, i+9, res.start(0)):
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self.syntax_error('illegal character in CDATA')
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if not self.stack:
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self.syntax_error('CDATA not in content')
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self.handle_cdata(rawdata[i+9:res.start(0)])
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return res.end(0)
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__xml_attributes = {'version': '1.0', 'standalone': 'no', 'encoding': None}
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# Internal -- handle a processing instruction tag
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def parse_proc(self, i):
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rawdata = self.rawdata
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end = procclose.search(rawdata, i)
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if not end:
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return -1
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j = end.start(0)
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if illegal.search(rawdata, i+2, j):
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self.syntax_error('illegal character in processing instruction')
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res = tagfind.match(rawdata, i+2)
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if not res:
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raise RuntimeError, 'unexpected call to parse_proc'
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k = res.end(0)
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name = res.group(0)
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if string.find(string.lower(name), 'xml') >= 0:
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self.syntax_error('illegal processing instruction target name')
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self.handle_proc(name, rawdata[k:j])
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return end.end(0)
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# Internal -- parse attributes between i and j
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def parse_attributes(self, tag, k, j, attributes = None):
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rawdata = self.rawdata
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# Now parse the data between k and j into a tag and attrs
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attrdict = {}
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try:
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# convert attributes list to dictionary
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d = {}
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for a in attributes:
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d[a] = None
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attributes = d
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except TypeError:
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pass
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while k < j:
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res = attrfind.match(rawdata, k)
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if not res: break
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attrname, attrvalue = res.group('name', 'value')
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if attrvalue is None:
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self.syntax_error('no attribute value specified')
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attrvalue = attrname
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elif attrvalue[:1] == "'" == attrvalue[-1:] or \
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attrvalue[:1] == '"' == attrvalue[-1:]:
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attrvalue = attrvalue[1:-1]
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else:
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self.syntax_error('attribute value not quoted')
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if attributes is not None and not attributes.has_key(attrname):
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self.syntax_error('unknown attribute %s of element %s' %
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(attrname, tag))
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if attrdict.has_key(attrname):
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self.syntax_error('attribute specified twice')
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attrvalue = string.translate(attrvalue, attrtrans)
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attrdict[attrname] = self.translate_references(attrvalue)
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k = res.end(0)
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if attributes is not None:
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# fill in with default attributes
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for key, val in attributes.items():
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if val is not None and not attrdict.has_key(key):
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attrdict[key] = val
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return attrdict, k
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# Internal -- handle starttag, return length or -1 if not terminated
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def parse_starttag(self, i):
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rawdata = self.rawdata
|
|
# i points to start of tag
|
|
end = endbracket.search(rawdata, i+1)
|
|
if not end:
|
|
return -1
|
|
j = end.start(0)
|
|
res = tagfind.match(rawdata, i+1)
|
|
if not res:
|
|
raise RuntimeError, 'unexpected call to parse_starttag'
|
|
k = res.end(0)
|
|
tag = res.group(0)
|
|
if not self.__seen_starttag and self.__seen_doctype:
|
|
if tag != self.__seen_doctype:
|
|
self.syntax_error('starttag does not match DOCTYPE')
|
|
if self.__seen_starttag and not self.stack:
|
|
self.syntax_error('multiple elements on top level')
|
|
if hasattr(self, tag + '_attributes'):
|
|
attributes = getattr(self, tag + '_attributes')
|
|
else:
|
|
attributes = None
|
|
attrdict, k = self.parse_attributes(tag, k, j, attributes)
|
|
res = starttagend.match(rawdata, k)
|
|
if not res:
|
|
self.syntax_error('garbage in start tag')
|
|
self.finish_starttag(tag, attrdict)
|
|
if res and res.group('slash') == '/':
|
|
self.finish_endtag(tag)
|
|
return end.end(0)
|
|
|
|
# Internal -- parse endtag
|
|
def parse_endtag(self, i):
|
|
rawdata = self.rawdata
|
|
end = endbracket.search(rawdata, i+1)
|
|
if not end:
|
|
return -1
|
|
res = tagfind.match(rawdata, i+2)
|
|
if not res:
|
|
self.syntax_error('no name specified in end tag')
|
|
tag = ''
|
|
k = i+2
|
|
else:
|
|
tag = res.group(0)
|
|
k = res.end(0)
|
|
if k != end.start(0):
|
|
self.syntax_error('garbage in end tag')
|
|
self.finish_endtag(tag)
|
|
return end.end(0)
|
|
|
|
# Internal -- finish processing of start tag
|
|
# Return -1 for unknown tag, 1 for balanced tag
|
|
def finish_starttag(self, tag, attrs):
|
|
self.stack.append(tag)
|
|
methodname = 'start_' + tag
|
|
if hasattr(self, methodname):
|
|
method = getattr(self, methodname)
|
|
self.handle_starttag(tag, method, attrs)
|
|
return 1
|
|
else:
|
|
self.unknown_starttag(tag, attrs)
|
|
return -1
|
|
|
|
# Internal -- finish processing of end tag
|
|
def finish_endtag(self, tag):
|
|
methodname = 'end_' + tag
|
|
if not tag:
|
|
self.syntax_error('name-less end tag')
|
|
found = len(self.stack) - 1
|
|
if found < 0:
|
|
self.unknown_endtag(tag)
|
|
return
|
|
else:
|
|
if tag not in self.stack:
|
|
self.syntax_error('unopened end tag')
|
|
if hasattr(self, methodname):
|
|
method = getattr(self, methodname)
|
|
self.handle_endtag(tag, method)
|
|
else:
|
|
self.unknown_endtag(tag)
|
|
return
|
|
found = len(self.stack)
|
|
for i in range(found):
|
|
if self.stack[i] == tag:
|
|
found = i
|
|
while len(self.stack) > found:
|
|
if found < len(self.stack) - 1:
|
|
self.syntax_error('missing close tag for %s' % self.stack[-1])
|
|
tag = self.stack[-1]
|
|
if hasattr(self, methodname):
|
|
method = getattr(self, methodname)
|
|
self.handle_endtag(tag, method)
|
|
else:
|
|
self.unknown_endtag(tag)
|
|
del self.stack[-1]
|
|
|
|
# Overridable -- handle xml processing instruction
|
|
def handle_xml(self, encoding, standalone):
|
|
pass
|
|
|
|
# Overridable -- handle DOCTYPE
|
|
def handle_doctype(self, tag, pubid, syslit, data):
|
|
pass
|
|
|
|
# Overridable -- handle start tag
|
|
def handle_starttag(self, tag, method, attrs):
|
|
method(attrs)
|
|
|
|
# Overridable -- handle end tag
|
|
def handle_endtag(self, tag, method):
|
|
method()
|
|
|
|
# Example -- handle character reference, no need to override
|
|
def handle_charref(self, name):
|
|
try:
|
|
if name[0] == 'x':
|
|
n = string.atoi(name[1:], 16)
|
|
else:
|
|
n = string.atoi(name)
|
|
except string.atoi_error:
|
|
self.unknown_charref(name)
|
|
return
|
|
if not 0 <= n <= 255:
|
|
self.unknown_charref(name)
|
|
return
|
|
self.handle_data(chr(n))
|
|
|
|
# Definition of entities -- derived classes may override
|
|
entitydefs = {'lt': '<', # must use charref
|
|
'gt': '>',
|
|
'amp': '&', # must use charref
|
|
'quot': '"',
|
|
'apos': ''',
|
|
}
|
|
|
|
# Example -- handle entity reference, no need to override
|
|
def handle_entityref(self, name):
|
|
table = self.entitydefs
|
|
if table.has_key(name):
|
|
self.handle_data(table[name])
|
|
else:
|
|
self.unknown_entityref(name)
|
|
return
|
|
|
|
# Example -- handle data, should be overridden
|
|
def handle_data(self, data):
|
|
pass
|
|
|
|
# Example -- handle cdata, could be overridden
|
|
def handle_cdata(self, data):
|
|
pass
|
|
|
|
# Example -- handle comment, could be overridden
|
|
def handle_comment(self, data):
|
|
pass
|
|
|
|
# Example -- handle processing instructions, could be overridden
|
|
def handle_proc(self, name, data):
|
|
pass
|
|
|
|
# Example -- handle relatively harmless syntax errors, could be overridden
|
|
def syntax_error(self, message):
|
|
raise RuntimeError, 'Syntax error at line %d: %s' % (self.lineno, message)
|
|
|
|
# To be overridden -- handlers for unknown objects
|
|
def unknown_starttag(self, tag, attrs): pass
|
|
def unknown_endtag(self, tag): pass
|
|
def unknown_charref(self, ref): pass
|
|
def unknown_entityref(self, ref): pass
|
|
|
|
|
|
class TestXMLParser(XMLParser):
|
|
|
|
def __init__(self, verbose=0):
|
|
self.testdata = ""
|
|
XMLParser.__init__(self, verbose)
|
|
|
|
def handle_xml(self, encoding, standalone):
|
|
self.flush()
|
|
print 'xml: encoding =',encoding,'standalone =',standalone
|
|
|
|
def handle_doctype(self, tag, pubid, syslit, data):
|
|
self.flush()
|
|
print 'DOCTYPE:',tag, `data`
|
|
|
|
def handle_entity(self, name, strval, pubid, syslit, ndata):
|
|
self.flush()
|
|
print 'ENTITY:',`data`
|
|
|
|
def handle_data(self, data):
|
|
self.testdata = self.testdata + data
|
|
if len(`self.testdata`) >= 70:
|
|
self.flush()
|
|
|
|
def flush(self):
|
|
data = self.testdata
|
|
if data:
|
|
self.testdata = ""
|
|
print 'data:', `data`
|
|
|
|
def handle_cdata(self, data):
|
|
self.flush()
|
|
print 'cdata:', `data`
|
|
|
|
def handle_proc(self, name, data):
|
|
self.flush()
|
|
print 'processing:',name,`data`
|
|
|
|
def handle_comment(self, data):
|
|
self.flush()
|
|
r = `data`
|
|
if len(r) > 68:
|
|
r = r[:32] + '...' + r[-32:]
|
|
print 'comment:', r
|
|
|
|
def syntax_error(self, message):
|
|
print 'error at line %d:' % self.lineno, message
|
|
|
|
def unknown_starttag(self, tag, attrs):
|
|
self.flush()
|
|
if not attrs:
|
|
print 'start tag: <' + tag + '>'
|
|
else:
|
|
print 'start tag: <' + tag,
|
|
for name, value in attrs.items():
|
|
print name + '=' + '"' + value + '"',
|
|
print '>'
|
|
|
|
def unknown_endtag(self, tag):
|
|
self.flush()
|
|
print 'end tag: </' + tag + '>'
|
|
|
|
def unknown_entityref(self, ref):
|
|
self.flush()
|
|
print '*** unknown entity ref: &' + ref + ';'
|
|
|
|
def unknown_charref(self, ref):
|
|
self.flush()
|
|
print '*** unknown char ref: &#' + ref + ';'
|
|
|
|
def close(self):
|
|
XMLParser.close(self)
|
|
self.flush()
|
|
|
|
def test(args = None):
|
|
import sys
|
|
|
|
if not args:
|
|
args = sys.argv[1:]
|
|
|
|
if args and args[0] == '-s':
|
|
args = args[1:]
|
|
klass = XMLParser
|
|
else:
|
|
klass = TestXMLParser
|
|
|
|
if args:
|
|
file = args[0]
|
|
else:
|
|
file = 'test.xml'
|
|
|
|
if file == '-':
|
|
f = sys.stdin
|
|
else:
|
|
try:
|
|
f = open(file, 'r')
|
|
except IOError, msg:
|
|
print file, ":", msg
|
|
sys.exit(1)
|
|
|
|
data = f.read()
|
|
if f is not sys.stdin:
|
|
f.close()
|
|
|
|
x = klass()
|
|
try:
|
|
for c in data:
|
|
x.feed(c)
|
|
x.close()
|
|
except RuntimeError, msg:
|
|
print msg
|
|
sys.exit(1)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
test()
|