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Kaydet (Commit) 7e07b384 authored tarafından Guido van Rossum's avatar Guido van Rossum
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üst 0454b512
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Lib/xmllib.py
Dosyayı görüntüle @ 7e07b384
......@@ -5,34 +5,50 @@ import re
import string
version = '0.1'
# Regular expressions used for parsing
_S = '[ \t\r\n]+'
_opS = '[ \t\r\n]*'
_Name = '[a-zA-Z_:][-a-zA-Z0-9._:]*'
interesting = re.compile('[&<]')
incomplete = re.compile('&(' + _Name + '|#[0-9]*|#x[0-9a-fA-F]*)?|'
'<([a-zA-Z_:][^<>]*|'
'/([a-zA-Z_:][^<>]*)?|'
'![^<>]*|'
r'\?[^<>]*)?')
ref = re.compile('&(' + _Name + '|#[0-9]+|#x[0-9a-fA-F]+);?')
illegal = re.compile('[^\t\r\n -\176\240-\377]') # illegal chars in content
interesting = re.compile('[]&<]')
amp = re.compile('&')
ref = re.compile('&(' + _Name + '|#[0-9]+|#x[0-9a-fA-F]+)[^-a-zA-Z0-9._:]')
entityref = re.compile('&(?P<name>' + _Name + ')[^-a-zA-Z0-9._:]')
charref = re.compile('&#(?P<char>[0-9]+[^0-9]|x[0-9a-fA-F]+[^0-9a-fA-F])')
space = re.compile(_S)
space = re.compile(_S + '$')
newline = re.compile('\n')
starttagopen = re.compile('<' + _Name)
endtagopen = re.compile('</')
starttagend = re.compile(_opS + '(?P<slash>/?)>')
endbracket = re.compile('>')
endbracket = re.compile(_opS + '>')
tagfind = re.compile(_Name)
cdataopen = re.compile(r'<!\[CDATA\[')
cdataclose = re.compile(r'\]\]>')
doctype = re.compile('<!DOCTYPE' + _S + '(?P<name>' + _Name + ')' + _S)
special = re.compile('<!(?P<special>[^<>]*)>')
procopen = re.compile(r'<\?(?P<proc>' + _Name + ')' + _S)
# this matches one of the following:
# SYSTEM SystemLiteral
# PUBLIC PubidLiteral SystemLiteral
_SystemLiteral = '(?P<%s>\'[^\']*\'|"[^"]*")'
_PublicLiteral = '(?P<%s>"[-\'()+,./:=?;!*#@$_%% \n\ra-zA-Z0-9]*"|' \
"'[-()+,./:=?;!*#@$_%% \n\ra-zA-Z0-9]*')"
_ExternalId = '(?:SYSTEM|' \
'PUBLIC'+_S+_PublicLiteral%'pubid'+ \
')'+_S+_SystemLiteral%'syslit'
doctype = re.compile('<!DOCTYPE'+_S+'(?P<name>'+_Name+')'
'(?:'+_S+_ExternalId+')?'+_opS)
xmldecl = re.compile('<\?xml'+_S+
'version'+_opS+'='+_opS+'(?P<version>\'[^\']*\'|"[^"]*")'+
'(?:'+_S+'encoding'+_opS+'='+_opS+
"(?P<encoding>'[A-Za-z][-A-Za-z0-9._]*'|"
'"[A-Za-z][-A-Za-z0-9._]*"))?'
'(?:'+_S+'standalone'+_opS+'='+_opS+
'(?P<standalone>\'(?:yes|no)\'|"(?:yes|no)"))?'+
_opS+'\?>')
procopen = re.compile(r'<\?(?P<proc>' + _Name + ')' + _opS)
procclose = re.compile(_opS + r'\?>')
commentopen = re.compile('<!--')
commentclose = re.compile('-->')
......@@ -41,6 +57,7 @@ attrfind = re.compile(
_S + '(?P<name>' + _Name + ')'
'(' + _opS + '=' + _opS +
'(?P<value>\'[^\']*\'|"[^"]*"|[-a-zA-Z0-9.:+*%?!()_#=~]+))')
attrtrans = string.maketrans(' \r\n\t', ' ')
# XML parser base class -- find tags and call handler functions.
......@@ -92,30 +109,43 @@ class XMLParser:
self.goahead(1)
# Interface -- translate references
def translate_references(self, data):
newdata = []
def translate_references(self, data, all = 1):
i = 0
while 1:
res = ref.search(data, i)
res = amp.search(data, i)
if res is None:
newdata.append(data[i:])
return string.join(newdata, '')
if data[res.end(0) - 1] != ';':
return data
res = ref.match(data, res.start(0))
if res is None:
self.syntax_error("bogus `&'")
i =i+1
continue
i = res.end(0)
if data[i - 1] != ';':
self.syntax_error("`;' missing after entity/char reference")
newdata.append(data[i:res.start(0)])
i = i-1
str = res.group(1)
pre = data[:res.start(0)]
post = data[i:]
if str[0] == '#':
if str[1] == 'x':
newdata.append(chr(string.atoi(str[2:], 16)))
str = chr(string.atoi(str[2:], 16))
else:
newdata.append(chr(string.atoi(str[1:])))
else:
try:
newdata.append(self.entitydefs[str])
except KeyError:
str = chr(string.atoi(str[1:]))
data = pre + str + post
i = res.start(0)+len(str)
elif all:
if self.entitydefs.has_key(str):
data = pre + self.entitydefs[str] + post
i = res.start(0) # rescan substituted text
else:
self.syntax_error('reference to unknown entity')
# can't do it, so keep the entity ref in
newdata.append('&' + str + ';')
i = res.end(0)
data = pre + '&' + str + ';' + post
i = res.start(0) + len(str) + 2
else:
# just translating character references
pass # i is already postioned correctly
# Internal -- handle data as far as reasonable. May leave state
# and data to be processed by a subsequent call. If 'end' is
......@@ -139,8 +169,14 @@ class XMLParser:
else:
j = n
if i < j:
if self.__at_start:
self.syntax_error('illegal data at start of file')
self.__at_start = 0
data = rawdata[i:j]
if not self.stack and not space.match(data):
self.syntax_error('data not in content')
if illegal.search(data):
self.syntax_error('illegal character in content')
self.handle_data(data)
self.lineno = self.lineno + string.count(data, '\n')
i = j
......@@ -184,6 +220,20 @@ class XMLParser:
self.lineno = self.lineno + string.count(rawdata[i:i], '\n')
i = k
continue
res = xmldecl.match(rawdata, i)
if res:
if not self.__at_start:
self.syntax_error("<?xml?> declaration not at start of document")
version, encoding, standalone = res.group('version',
'encoding',
'standalone')
if version[1:-1] != '1.0':
raise RuntimeError, 'only XML version 1.0 supported'
if encoding: encoding = encoding[1:-1]
if standalone: standalone = standalone[1:-1]
self.handle_xml(encoding, standalone)
i = res.end(0)
continue
res = procopen.match(rawdata, i)
if res:
k = self.parse_proc(i)
......@@ -209,18 +259,6 @@ class XMLParser:
self.lineno = self.lineno + string.count(rawdata[i:k], '\n')
i = k
continue
res = special.match(rawdata, i)
if res:
if self.literal:
data = rawdata[i]
self.handle_data(data)
self.lineno = self.lineno + string.count(data, '\n')
i = i+1
continue
self.handle_special(res.group('special'))
self.lineno = self.lineno + string.count(res.group(0), '\n')
i = res.end(0)
continue
elif rawdata[i] == '&':
res = charref.match(rawdata, i)
if res is not None:
......@@ -228,6 +266,8 @@ class XMLParser:
if rawdata[i-1] != ';':
self.syntax_error("`;' missing in charref")
i = i-1
if not self.stack:
self.syntax_error('data not in content')
self.handle_charref(res.group('char')[:-1])
self.lineno = self.lineno + string.count(res.group(0), '\n')
continue
......@@ -237,36 +277,45 @@ class XMLParser:
if rawdata[i-1] != ';':
self.syntax_error("`;' missing in entityref")
i = i-1
self.handle_entityref(res.group('name'))
name = res.group('name')
if self.entitydefs.has_key(name):
self.rawdata = rawdata = rawdata[:res.start(0)] + self.entitydefs[name] + rawdata[i:]
n = len(rawdata)
i = res.start(0)
else:
self.syntax_error('reference to unknown entity')
self.unknown_entityref(name)
self.lineno = self.lineno + string.count(res.group(0), '\n')
continue
elif rawdata[i] == ']':
if n-i < 3:
break
if cdataclose.match(rawdata, i):
self.syntax_error("bogus `]]>'")
self.handle_data(rawdata[i])
i = i+1
continue
else:
raise RuntimeError, 'neither < nor & ??'
# We get here only if incomplete matches but
# nothing else
res = incomplete.match(rawdata, i)
if not res:
data = rawdata[i]
self.handle_data(data)
self.lineno = self.lineno + string.count(data, '\n')
i = i+1
continue
j = res.end(0)
if j == n:
break # Really incomplete
self.syntax_error("bogus `<' or `&'")
data = res.group(0)
self.handle_data(data)
self.lineno = self.lineno + string.count(data, '\n')
i = j
break
# end while
if i > 0:
self.__at_start = 0
if end and i < n:
data = rawdata[i:n]
data = rawdata[i]
self.syntax_error("bogus `%s'" % data)
if illegal.search(data):
self.syntax_error('illegal character in content')
self.handle_data(data)
self.lineno = self.lineno + string.count(data, '\n')
i = n
self.rawdata = rawdata[i+1:]
return self.goahead(end)
self.rawdata = rawdata[i:]
if end:
if not self.__seen_starttag:
self.syntax_error('no elements in file')
if self.stack:
self.syntax_error('missing end tags')
while self.stack:
......@@ -280,9 +329,12 @@ class XMLParser:
res = commentclose.search(rawdata, i+4)
if not res:
return -1
# doubledash search will succeed because it's a subset of commentclose
if doubledash.search(rawdata, i+4).start(0) < res.start(0):
if doubledash.search(rawdata, i+4, res.start(0)):
self.syntax_error("`--' inside comment")
if rawdata[res.start(0)-1] == '-':
self.syntax_error('comment cannot end in three dashes')
if illegal.search(rawdata, i+4, res.start(0)):
self.syntax_error('illegal character in comment')
self.handle_comment(rawdata[i+4: res.start(0)])
return res.end(0)
......@@ -291,28 +343,59 @@ class XMLParser:
rawdata = self.rawdata
n = len(rawdata)
name = res.group('name')
pubid, syslit = res.group('pubid', 'syslit')
if pubid is not None:
pubid = pubid[1:-1] # remove quotes
pubid = string.join(string.split(pubid)) # normalize
if syslit is not None: syslit = syslit[1:-1] # remove quotes
j = k = res.end(0)
level = 0
while k < n:
c = rawdata[k]
if c == '<':
level = level + 1
elif c == '>':
if level == 0:
self.handle_doctype(name, rawdata[j:k])
return k+1
level = level - 1
if k >= n:
return -1
if rawdata[k] == '[':
level = 0
k = k+1
return -1
dq = sq = 0
while k < n:
c = rawdata[k]
if not sq and c == '"':
dq = not dq
elif not dq and c == "'":
sq = not sq
elif sq or dq:
pass
elif level <= 0 and c == ']':
res = endbracket.match(rawdata, k+1)
if not res:
return -1
self.handle_doctype(name, pubid, syslit, rawdata[j+1:k])
return res.end(0)
elif c == '<':
level = level + 1
elif c == '>':
level = level - 1
if level < 0:
self.syntax_error("bogus `>' in DOCTYPE")
k = k+1
res = endbracket.search(rawdata, k)
if not res:
return -1
if res.start(0) != k:
self.syntax_error('garbage in DOCTYPE')
self.handle_doctype(name, pubid, syslit, None)
return res.end(0)
# Internal -- handle CDATA tag, return length or -1 if not terminated
def parse_cdata(self, i):
rawdata = self.rawdata
if rawdata[i:i+9] <> '<![CDATA[':
raise RuntimeError, 'unexpected call to handle_cdata'
raise RuntimeError, 'unexpected call to parse_cdata'
res = cdataclose.search(rawdata, i+9)
if not res:
return -1
if illegal.search(rawdata, i+9, res.start(0)):
self.syntax_error('illegal character in CDATA')
if not self.stack:
self.syntax_error('CDATA not in content')
self.handle_cdata(rawdata[i+9:res.start(0)])
return res.end(0)
......@@ -324,24 +407,15 @@ class XMLParser:
if not end:
return -1
j = end.start(0)
if illegal.search(rawdata, i+2, j):
self.syntax_error('illegal character in processing instruction')
res = tagfind.match(rawdata, i+2)
if not res:
raise RuntimeError, 'unexpected call to parse_proc'
k = res.end(0)
name = res.group(0)
if name == 'xml':
if self.__at_start:
attrdict, k = self.parse_attributes('xml', k, j,
self.__xml_attributes)
if k != j:
self.syntax_error('garbage at end of <?xml?>')
if attrdict['version'] != '1.0':
self.syntax_error('only XML version 1.0 supported')
self.handle_xml(attrdict.get('encoding', None),
attrdict['standalone'])
return end.end(0)
else:
self.syntax_error("<?xml?> tag not at start of document")
if string.find(string.lower(name), 'xml') >= 0:
self.syntax_error('illegal processing instruction target name')
self.handle_proc(name, rawdata[k:j])
return end.end(0)
......@@ -375,6 +449,7 @@ class XMLParser:
(attrname, tag))
if attrdict.has_key(attrname):
self.syntax_error('attribute specified twice')
attrvalue = string.translate(attrvalue, attrtrans)
attrdict[attrname] = self.translate_references(attrvalue)
k = res.end(0)
if attributes is not None:
......@@ -400,6 +475,8 @@ class XMLParser:
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:
......@@ -428,10 +505,7 @@ class XMLParser:
tag = res.group(0)
k = res.end(0)
if k != end.start(0):
# check that there is only white space at end of tag
res = space.match(rawdata, k)
if res is None or res.end(0) != end.start(0):
self.syntax_error('garbage in end tag')
self.syntax_error('garbage in end tag')
self.finish_endtag(tag)
return end.end(0)
......@@ -439,17 +513,18 @@ class XMLParser:
# Return -1 for unknown tag, 1 for balanced tag
def finish_starttag(self, tag, attrs):
self.stack.append(tag)
try:
method = getattr(self, 'start_' + tag)
except AttributeError:
self.unknown_starttag(tag, attrs)
return -1
else:
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
......@@ -459,9 +534,10 @@ class XMLParser:
else:
if tag not in self.stack:
self.syntax_error('unopened end tag')
try:
method = getattr(self, 'end_' + tag)
except AttributeError:
if hasattr(self, methodname):
method = getattr(self, methodname)
self.handle_endtag(tag, method)
else:
self.unknown_endtag(tag)
return
found = len(self.stack)
......@@ -472,11 +548,8 @@ class XMLParser:
if found < len(self.stack) - 1:
self.syntax_error('missing close tag for %s' % self.stack[-1])
tag = self.stack[-1]
try:
method = getattr(self, 'end_' + tag)
except AttributeError:
method = None
if method:
if hasattr(self, methodname):
method = getattr(self, methodname)
self.handle_endtag(tag, method)
else:
self.unknown_endtag(tag)
......@@ -487,7 +560,7 @@ class XMLParser:
pass
# Overridable -- handle DOCTYPE
def handle_doctype(self, tag, data):
def handle_doctype(self, tag, pubid, syslit, data):
pass
# Overridable -- handle start tag
......@@ -514,7 +587,12 @@ class XMLParser:
self.handle_data(chr(n))
# Definition of entities -- derived classes may override
entitydefs = {'lt': '<', 'gt': '>', 'amp': '&', 'quot': '"', 'apos': "'"}
entitydefs = {'lt': '&#60;', # must use charref
'gt': '&#62;',
'amp': '&#38;', # must use charref
'quot': '&#34;',
'apos': '&#39;',
}
# Example -- handle entity reference, no need to override
def handle_entityref(self, name):
......@@ -541,10 +619,6 @@ class XMLParser:
def handle_proc(self, name, data):
pass
# Example -- handle special instructions, could be overridden
def handle_special(self, 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)
......@@ -566,10 +640,14 @@ class TestXMLParser(XMLParser):
self.flush()
print 'xml: encoding =',encoding,'standalone =',standalone
def handle_doctype(self, tag, data):
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:
......@@ -589,10 +667,6 @@ class TestXMLParser(XMLParser):
self.flush()
print 'processing:',name,`data`
def handle_special(self, data):
self.flush()
print 'special:',`data`
def handle_comment(self, data):
self.flush()
r = `data`
......@@ -660,9 +734,13 @@ def test(args = None):
f.close()
x = klass()
for c in data:
x.feed(c)
x.close()
try:
for c in data:
x.feed(c)
x.close()
except RuntimeError, msg:
print msg
sys.exit(1)
if __name__ == '__main__':
......
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