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sax2rdf.py
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sax2rdf.py
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#! /usr/bin/python
"""
A parser for RDF/XML built on the sax2 interface;
derived from a parser for RDF/XML built on the xmllib XML parser.
To do: Passing on namesapce bindings!
(dwc: @@huh?)
(tbl: The bind call in the RDF stream API is used to pass
on the prefixes found, as hints only for generating readable output code)
- Add parsing of RDF bags
parses DAML_ONT_NS or List_NS lists, generates List_NS
References:
Python/XML HOWTO
The Python/XML Special Interest Group
xml-sig@python.org
(edited by amk1@bigfoot.com)
http://py-howto.sourceforge.net/xml-howto/xml-howto.html
http://www.megginson.com/SAX/applications.html#python.parsers
http://www.python.org/sigs/xml-sig/
How to on xmllib:
http://www.python.org/doc/howto/xml/node7.html
RDF grammar http://www.w3.org/TR/rdf-syntax-grammar/ esp sections 6 and 7
##################################### SAX pointers
First hit on Python SAX parser
http://www.gca.org/papers/xmleurope2000/papers/s28-04.html#N84395
Howto use SAX in python:
http://www.python.org/doc/howto/xml/SAX.html
"""
# Some of the code adding support for XMLLiteral is
# Copyright (c) 2002, Daniel Krech, http://eikeon.com/
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials provided
# with the distribution.
#
# * Neither the name of Daniel Krech nor the names of its
# contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
import string
import sys
import uripath
from why import BecauseOfData
import isXML
import diag
#from webAccess import urlopenForRDF # http://www.w3.org/2000/10/swap/
import xml.sax # PyXML stuff
# http://sourceforge.net/projects/pyxml
# Connolly uses the debian python2-xml 0.6.5-2 package
# http://packages.debian.org/testing/interpreters/python2-xml.html
# and suggests TimBL try the win32 distribution from
# the PyXML sourceforge project
# http://prdownloads.sourceforge.net/pyxml/PyXML-0.6.5.win32-py2.1.exe
# TimBL points outhe does not use windows env't but cygwin and
# giuesses he should compile python2-xml for cygwin.
import xml.sax._exceptions
from xml.sax.saxutils import quoteattr
from xml.sax.handler import feature_namespaces
XMLLiteralsAsDomTrees = 1
if XMLLiteralsAsDomTrees:
import xml.dom # for XMLLiterals
import RDFSink
from RDFSink import FORMULA, ANONYMOUS, NODE_MERGE_URI
# States:
STATE_OUTERMOST = "outermost level" # Before <rdf:RDF>
STATE_NOT_RDF = "not RDF" # Before <rdf:RDF>
STATE_NO_SUBJECT = "no context" # @@@@@@@@@ use numbers for speed
STATE_DESCRIPTION = "Description (have subject)" #
STATE_LITERAL = "within XML literal"
STATE_VALUE = "plain value"
STATE_NOVALUE = "no value" # We already have an object, another would be error
STATE_LIST = "within list"
RDF_NS_URI = "http://www.w3.org/1999/02/22-rdf-syntax-ns#" # As per the spec
RDF_Specification = "http://www.w3.org/TR/REC-rdf-syntax/" # Must come in useful :-)
DAML_ONT_NS = "http://www.daml.org/2000/10/daml-ont#" # DAML early version
DPO_NS = "http://www.daml.org/2001/03/daml+oil#" # DAML plus oil
OWL_NS = "http://www.w3.org/2002/07/owl#" # OWL
List_NS = RDF_NS_URI # Changed 200308
XML_NS_URI = "http://www.w3.org/XML/1998/namespace"
from diag import verbosity, progress, tracking
from set_importer import Set
_nextId = 0 # For generation of arbitrary names for anonymous nodes
coreSyntaxTerms = ['RDF', 'ID', 'about', 'parseType', 'resource', 'nodeID', 'datatype']
syntaxTerms = coreSyntaxTerms + ['Description', 'li']
oldTerms = ['aboutEach', 'aboutEachPrefix', 'bagID']
nodeElementExceptions = {}
for a in coreSyntaxTerms + oldTerms + ['li',]:
nodeElementExceptions[RDF_NS_URI + a] = True
propertyElementExceptions = {}
for a in coreSyntaxTerms + oldTerms + ['Description',]:
propertyElementExceptions[RDF_NS_URI + a] = True
propertyAttributeExceptions = {}
for a in syntaxTerms + oldTerms:
propertyAttributeExceptions[RDF_NS_URI + a] = True
class RDFHandler(xml.sax.ContentHandler):
"""RDF Parser using SAX API for XML parsing
"""
def __init__(self, sink, openFormula, thisDoc, baseURI=None, flags="", why=None):
self.testdata = ""
if XMLLiteralsAsDomTrees:
self.domImplementation = xml.dom.getDOMImplementation()
self.domDocument = None
self.domElement = None
self.flags = flags
self._stack =[] # Stack of states
self._nsmap = [] # stack of namespace bindings
self._prefixMap = []
self.LiteralNS = None
self._delayedStatement = None
self.sink = sink
self._thisDoc = thisDoc
if baseURI != None: self._base = baseURI
else: self._base = thisDoc
self._state = STATE_OUTERMOST # Maybe should ignore RDF outside <rdf:RDF>??
if sink:
if openFormula==None:
self._context = sink.newFormula(thisDoc + "#_formula")
else:
self._context = openFormula
self._formula = self._context # Root formula
self._genPrefix = uripath.join(thisDoc, "#_rdfxg") # allow parameter override?
self.sink.setGenPrefix(self._genPrefix)
self.sink.startDoc()
self.merge = self.sink.newSymbol(NODE_MERGE_URI)
else:
self._context = None
self._reason = why # Why the parser w
self._reason2 = None # Why these triples
if diag.tracking: self._reason2 = BecauseOfData(
sink.newSymbol(thisDoc), because=self._reason)
self._subject = None
self._predicate = None
self._datatype = None
self._language = None
self._nodeIDs = {}
self._items = [] # for <rdf:li> containers
self._litDepth = 0
self._usedIDs = Set()
version = "$Id$"
# self.sink.makeComment("RDF parsed by "+version[1:-1])
if "D" in self.flags: # Assume default namespace declaration
if sink: self.sink.setDefaultNamespace(self._thisDoc+"#")
self._nsmap = [ { "": "#"} ]
def characters(self, data):
if XMLLiteralsAsDomTrees and (self._state == STATE_LITERAL):
t = self.domDocument.createTextNode(data)
self.domElement.appendChild(t)
return
if self._state == STATE_VALUE or \
self._state == STATE_LITERAL:
self.testdata += data
def flush(self):
data = self.testdata
if data:
self.testdata = ""
# print '# flushed data:', `data`
def processingInstruction(self, name, data):
self.flush()
#print 'processing:',name,`data`
def uriref(self, str):
""" Generate uri from uriref in this document
unicode strings OK.
"""
return uripath.join(self._base, str)
def newBlankNode(self):
columnNumber = self._p.getColumnNumber()
lineNumber = self._p.getLineNumber()
bnodeID = self._thisDoc + "#_L%iC%i" % (lineNumber, columnNumber)
return self.sink.newBlankNode(self._context, uri=bnodeID,
why=self._reason2) #for debugging: encode file/line info
def idAboutAttr(self, attrs): #MS1.0 6.5 also proprAttr 6.10
""" set up subject and maybe context from attributes
"""
self._subject = None
self._state = STATE_DESCRIPTION
self._items.append(0)
properties = []
for name, value in attrs.items():
ns, ln = name
# The following section was a kludge to work with presumably old bad RDF
# files while RDF was being defined way back when.
# if ns: # Removed 2010 as this is a kludge which creaks with sioc:about - timbl 2010-07-19
# if string.find("ID about aboutEachPrefix bagID type", ln)>0:
# if ns != RDF_NS_URI:
# print ("# Warning -- %s attribute in %s namespace not RDF NS." %
# name, ln)
# ns = RDF_NS_URI # Allowed as per dajobe: ID, bagID, about, resource, parseType or type
if ns == RDF_NS_URI or ns == None: # Opinions vary sometimes none but RDF_NS is common :-(
if ln == "ID":
if not isXML.isName(value):
raise BadSyntax(sys.exc_info(), 'An ID must be a Name %s' % value)
if (self._base, value) in self._usedIDs:
raise BadSyntax(sys.exc_info(), "Two elements cannot have the same ID, %s" % value)
self._usedIDs.add((self._base, value))
if self._subject:
print "# oops - subject already", self._subject
raise BadSyntax(sys.exc_info(), ">1 subject")
self._subject = self.sink.newSymbol(self.uriref("#" + value))
elif ln == "about":
if self._subject: raise BadSyntax(sys.exc_info(),
"Subject already defined to be %s, can't have attribute about='%s'" %
(`self._subject`, value))
self._subject = self.sink.newSymbol(self.uriref(value))
elif ln == "nodeID":
if self._subject: raise BadSyntax(sys.exc_info(),
"Subject already defined to be %s, can't have attribute nodeID='%s'" %
(`self._subject`, value))
if not isXML.isNCName(value):
raise BadSyntax(sys.exc_info(), 'A nodeID must be a NCName %s' % value)
s = self._nodeIDs.get(value, None)
if s == None:
s = self.newBlankNode()
self._nodeIDs[value] = s
self._subject = s
elif ln == "aboutEachPrefix":
if value == " ": # OK - a trick to make NO subject
self._subject = None
else: raise ooops # can't do about each prefix yet
elif ln == "bagID":
if not isXML.isName(value):
raise BadSyntax(sys.exc_info(), 'A bagID must be a Name %s' % value)
c = self._context #@@dwc: this is broken, no?
self._context = FORMULA, self.uriref("#" + value) #@@ non-ascii
elif ln == "parseType":
pass #later - object-related
elif ln == "resource":
pass #later
elif ln == "datatype":
pass #later
elif RDF_NS_URI + ln in propertyAttributeExceptions:
raise BadSyntax(sys.exc_info(), "%s is not a valid attribute named here" % RDF_NS_URI + ln)
else:
if not ns:
if "L" not in self.flags: # assume local?
raise BadSyntax(sys.exc_info(), "No namespace on property attribute %s" % ln)
properties.append((self._thisDoc + "#" + ln, value))
else:
properties.append((RDF_NS_URI + ln, value))# If no uri, syntax error @@
# self.sink.makeComment("xml2rdf: Ignored attribute "+ RDF_NS_URI + ln)
elif ns == XML_NS_URI:
pass # lang already done, others ignored
else: # Property attribute propAttr #MS1.0 6.10
uri = (ns + ln);
properties.append((uri, value))
# print "@@@@@@ <%s> <%s>" % properties[-1]
if self._subject == None:
self._subject = self.newBlankNode()
for pred, obj in properties:
if pred == RDF_NS_URI + "type":
self.sink.makeStatement(( self._context,
self.sink.newSymbol(pred),
self._subject,
self.sink.newSymbol(self.uriref(obj)) ), why=self._reason2)
else:
dt = self._datatype
if dt == None: lang = self._language
else: lang = None
self.sink.makeStatement(( self._context,
self.sink.newSymbol(pred),
self._subject,
self.sink.newLiteral(obj, dt, lang) ), why=self._reason2)
def _nodeElement(self, tagURI, attrs): #MS1.0 6.2
if tagURI == RDF_NS_URI + "Description":
self.idAboutAttr(attrs) # Set up subject and context
elif tagURI in nodeElementExceptions:
raise ValueError, "%s as typednode not implemented" % tagURI
else: # Unknown tag within STATE_NO_SUBJECT: typedNode #MS1.0 6.13
c = self._context # (Might be changed in idAboutAttr) #@@DC: huh?
self.idAboutAttr(attrs)
assert c != None
assert self._subject != None
self.sink.makeStatement(( c,
self.sink.newSymbol(RDF_NS_URI+"type"),
self._subject,
self.sink.newSymbol(tagURI) ), why=self._reason2)
self._state = STATE_DESCRIPTION
def _propertyAttr(self, ns, name, value):
"Parse a propertrAttr production. 7.2.25"
if verbosity() > 50: progress("_propertyAttr ns=%s name=%s value=%s"%
(ns, name, value))
if self._subject == None: # Property as attribute
self._subject = self.newBlankNode()
self.sink.makeStatement((self._context,
self._predicate,
self._subject,
self._subject ), why=self._reason2)
if not ns:
if "L" not in self.flags: # assume local?
raise BadSyntax(sys.exc_info(), "No namespace on property attribute %s=%s" % (name, value))
ns = self._thisDoc + "#"
pred = ns + name
if pred == RDF_NS_URI + "type": # special case
obj = self.sink.newSymbol(self.uriref(value)) # SYN#7.2.11 step 2/3
else:
obj = self.sink.newLiteral(value, self._datatype, self._language)
self.sink.makeStatement((self._context,
self.sink.newSymbol(self.uriref(pred)),
self._subject,
obj), why=self._reason2)
self._state = STATE_NOVALUE # NOT looking for value
return
def startPrefixMapping(self, prefix, uri):
"""Performance note:
We make a new dictionary for every binding.
This makes lookup quick and easy, but
it takes extra space and more time to
set up a new binding."""
#print "startPrefixMapping with prefix=", prefix, "uri=", `uri`
prefix = prefix or ""
uri = uri or ""
uri = self.uriref(uri)
if self._nsmap:
b = self._nsmap[-1].copy()
c = self._prefixMap[-1].copy()
else:
b = {}
c = {}
b[prefix] = uri
c[uri] = prefix
self._nsmap.append(b)
self._prefixMap.append(c)
if self.sink: self.sink.bind(prefix, uri)
def endPrefixMapping(self, prefix):
del self._nsmap[-1]
self._prefixMap.pop()
def startElementNS(self, name, qname, attrs):
""" Handle start tag.
"""
if self._state != STATE_LITERAL:
self.flush()
self.bnode = None
tagURI = ((name[0] or "") + name[1])
if verbosity() > 80:
indent = ". " * len(self._stack)
if not attrs:
progress(indent+'# State was', self._state, ', start tag: <' + tagURI + '>')
else:
str = '# State =%s, start tag= <%s ' %( self._state, tagURI)
for name, value in attrs.items():
str = str + " " + `name` + '=' + '"' + `value` + '"'
progress(indent + str + '>')
self._stack.append([self._state, self._context, self._predicate,
self._subject, self._delayedStatement, self._base])
self._delayedStatement = None
self._base = uripath.join(self._base, attrs.get((XML_NS_URI, "base"), self._base))
x = self._base.find("#")
if x >= 0: self._base = self._base[:x] # See rdf-tests/rdfcore/xmlbase/test013.rdf
try:
tagURI = uripath.join(self._base, tagURI) # If relative, make absolute. Not needed for standard.
except ValueError:
pass
# Needed for portable RDF generated with --rdf=z
self._language = attrs.get((XML_NS_URI, "lang"), None)
value = attrs.get((RDF_NS_URI, "datatype"), None)
if value != None: self._datatype = self.sink.newSymbol(self.uriref(value))
else: self._datatype = None
if self._state == STATE_OUTERMOST:
if tagURI == RDF_NS_URI + "RDF":
self._state = STATE_NO_SUBJECT
else:
if "R" not in self.flags:
self._state = STATE_NOT_RDF # Ignore random XML without rdf:RDF
else:
self._nodeElement(tagURI, attrs) # Parse it as RDF.
# http://www.w3.org/2000/10/rdf-tests/rdfcore/rdf-element-not-mandatory/test001.rdf
elif self._state == STATE_NOT_RDF:
if tagURI == RDF_NS_URI + "RDF" and "T" in self.flags:
self._state = STATE_NO_SUBJECT
else:
pass # Ignore embedded RDF
elif self._state == STATE_NO_SUBJECT: #MS1.0 6.2 obj :: desription | container
self._nodeElement(tagURI, attrs)
elif self._state == STATE_DESCRIPTION: # Expect predicate (property) PropertyElt
# propertyElt #MS1.0 6.12
# http://www.w3.org/2000/03/rdf-tracking/#rdf-containers-syntax-ambiguity
if tagURI == RDF_NS_URI + "li":
item = self._items[-1] + 1
self._predicate = self.sink.newSymbol("%s_%s" % (RDF_NS_URI, item))
self._items[-1] = item
else:
if tagURI in propertyElementExceptions:
raise BadSyntax(sys.exc_info(), 'Invalid predicate URI: %s' % tagURI)
self._predicate = self.sink.newSymbol(tagURI)
self._state = STATE_VALUE # May be looking for value but see parse type
# self._datatype = None
# self._language = None
self.testdata = "" # Flush value data
# print "\n attributes:", `attrs`
properties = []
gotSubject = 0
haveResource = 0
haveParseType = 0
haveExtras = 0
for name, value in attrs.items():
ns, name = name
if name == "ID":
print "# Warning: ID=%s on statement ignored" % (value) # I consider these a bug
raise ValueError("ID attribute? Reification not supported.")
elif name == "parseType":
haveParseType = 1
# x = value.find(":")
# if x>=0: pref = value[:x]
# else: pref = ""
# nsURI = self._nsmap[-1].get(pref, None)
if value == "Resource":
c = self._context
s = self._subject
# self._subject = self.sink.newBlankNode(self._context, why=self._reason2)
self.idAboutAttr(attrs) #@@ not according to current syntax @@@@@@@@@@@
self.sink.makeStatement(( c, self._predicate, s, self._subject), why=self._reason2)
self._state = STATE_DESCRIPTION # Nest description
elif value == "Quote":
c = self._context
s = self._subject
self.idAboutAttr(attrs) # set subject and context for nested description
self._subject = self.sink.newFormula() # Forget anonymous genid - context is subect
if self._predicate is self.merge: # magic :-(
self._stack[-1][3] = self._subject # St C P S retrofit subject of outer level!
self._delayedStatement = 1 # flag
else:
self._delayedStatement = c, self._predicate, s, self._subject
self._context = self._subject
self._subject = None
self._state = STATE_NO_SUBJECT # Inside quote, there is no subject
elif (value=="Collection" or
value[-11:] == ":collection"): # Is this a daml:collection qname?
self._state = STATE_LIST # Linked list of obj's
elif value == "Literal" or "S" in self.flags: # Strictly, other types are literal SYN#7.2.20
self._state = STATE_LITERAL # That's an XML subtree not a string
self._litDepth = 1
self.LiteralNS = [{}]
self.testdata = '' #"@@sax2rdf.py bug@@" # buggy implementation
self._datatype = self.sink.newSymbol("http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral")
if XMLLiteralsAsDomTrees:
self.domDocument = self.domImplementation.createDocument(
'http://www.w3.org/1999/02/22-rdf-syntax-ns', 'envelope', None)
self.domElement = self.domDocument.documentElement
else:
raise SyntaxError("Unknown parse type '%s'" % value )
elif name == "nodeID":
assert not gotSubject
if not isXML.isNCName(value):
raise BadSyntax(sys.exc_info(), 'A nodeID must be a NCName %s' % value)
obj = self._nodeIDs.get(value, None)
if obj == None:
obj = self.newBlankNode()
self._nodeIDs[value] = obj
self.sink.makeStatement((self._context,
self._predicate,
self._subject,
obj ), why=self._reason2)
self._state = STATE_NOVALUE # NOT looking for value
self._subject = obj
gotSubject = 1
elif name == "resource":
haveResource = 1
assert not gotSubject
x = self.sink.newSymbol(self.uriref(value))
self.sink.makeStatement((self._context,
self._predicate,
self._subject,
x ), why=self._reason2)
self._state = STATE_NOVALUE # NOT looking for value
self._subject = x
gotSubject = 1
elif name == "datatype":
pass # Already set
elif ns == XML_NS_URI or name[:3] == "xml": # Ignore (lang is already done)
pass # see rdf-tests/rdfcore/unrecognised-xml-attributes/test002.rdf
else:
haveExtras = 1
properties.append((ns, name, value)) # wait till subject is clear
assert haveResource + haveParseType <= 1
assert haveParseType + haveExtras <= 1
if not gotSubject and properties:
obj = self.newBlankNode()
self.sink.makeStatement((self._context,
self._predicate,
self._subject,
obj ), why=self._reason2)
self._state = STATE_NOVALUE # NOT looking for value
self._subject = obj
for ns, name, value in properties:
self._propertyAttr(ns, name, value)
elif self._state == STATE_LIST: # damlCollection :: objs - make list
# Subject and predicate are set and dangling.
c = self._context
s = self._subject # The tail of the list so far
p = self._predicate
pair = self.newBlankNode() # The new pair
self.sink.makeStatement(( c, # Link in new pair
p,
s,
pair ), why=self._reason2)
self.idAboutAttr(attrs) # set subject (the next item) and context
if tagURI != RDF_NS_URI + "Description":
self.sink.makeStatement((c,
self.sink.newSymbol(RDF_NS_URI
+"type"),
self._subject,
self.sink.newSymbol(tagURI) ),
why=self._reason2)
self.sink.makeStatement(( c,
self.sink.newSymbol(List_NS + "first"),
pair,
self._subject), why=self._reason2) # new item
if "S" in self.flags: # Strictly to spec
self.sink.makeStatement(( c,
self.sink.newSymbol(RDF_NS_URI + "type"),
self.sink.newSymbol(List_NS + "List"),
self._subject), why=self._reason2) # new item
self._stack[-1][2] = self.sink.newSymbol(List_NS + "rest") # Leave dangling link #@check
self._stack[-1][3] = pair # Underlying state tracks tail of growing list
elif self._state == STATE_VALUE: # Value :: Obj in this case #MS1.0 6.17 6.2
c = self._context
p = self._predicate
s = self._subject
self._nodeElement(tagURI, attrs) # Parse the object thing's attributes
self.sink.makeStatement((c, p, s, self._subject), why=self._reason2)
self._stack[-1][0] = STATE_NOVALUE # When we return, cannot have literal now
elif self._state == STATE_NOVALUE:
str = ""
for e in self._stack: str = str + `e`+"\n"
raise BadSyntax(sys.exc_info(), """Expected no value, found name=%s; qname=%s, attrs=%s
in nested context:\n%s""" %(name, qname, attrs, str))
elif self._state == STATE_LITERAL:
self._litDepth = self._litDepth + 1
if XMLLiteralsAsDomTrees:
# progress("@@@ XML literal name: ", name)
self.literal_element_start_DOM(name, qname, attrs)
else:
self.literal_element_start(name, qname, attrs)
#@@ need to capture the literal
else:
raise RuntimeError, ("Unknown state in RDF parser", self._stack) # Unknown state
# aboutEachprefix { <#> forall r . { r startsWith ppp } l:implies ( zzz } )
# aboutEach { <#> forall r . { ppp rdf:li r } l:implies ( zzz } )
def endElementNS(self, name, qname):
"""Handle end element event
"""
if verbosity() > 80:
indent = "- " * len(self._stack)
progress(indent+'# End %s, State was'%name[1], self._state, ", delayed was ", `self._delayedStatement`)
if self._delayedStatement == 1:
if verbosity() > 80: progress("Delayed subject "+`self._subject`)
self._stack[-1][3] = self._stack[-1][3].close()
if self._state == STATE_LITERAL:
self._litDepth = self._litDepth - 1
if self._litDepth == 0:
buf = self.testdata
if XMLLiteralsAsDomTrees:
e = self.domDocument.documentElement.firstChild
if e is None:
raise ValueError("Weird: " + `self.domDocument.documentElement`)
# progress('e is '+`e`)
while e.nodeType == e.TEXT_NODE:
e = e.nextSibling
#progress("@@@ e=", e, e.nodeName)
self.domElement = e # Leave for literal parser to pick up
if self.sink:
self.sink.makeStatement(( self._context,
self._predicate,
self._subject,
self.sink.newXMLLiteral(e) ),
why=self._reason2)
else:
self._datatype = self.sink.newSymbol("http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral")
self.sink.makeStatement(( self._context,
self._predicate,
self._subject,
self.sink.newLiteral(buf, self._datatype) ), why=self._reason2)
self.testdata = ""
else:
if XMLLiteralsAsDomTrees:
self.literal_element_end_DOM(name, qname)
else:
self.literal_element_end(name, qname)
self._stack.pop()
return # don't pop state
elif self._state == STATE_VALUE:
buf = self.testdata
if self._datatype == None: # RDFCore changes 2003 - can't have dt and lang
lang = self._language
else:
lang = None
obj = self.sink.newLiteral(buf, self._datatype, lang)
self.sink.makeStatement(( self._context,
self._predicate,
self._subject,
obj), why=self._reason2)
self.testdata = ""
elif self._state == STATE_LIST:
self.sink.makeStatement(( self._context,
self.sink.newSymbol(List_NS + "rest"),
self._subject,
self.sink.newSymbol(List_NS + "nil") ), why=self._reason2)
elif self._state == STATE_DESCRIPTION:
self._items.pop()
elif self._state == STATE_NOVALUE or \
self._state == STATE_NO_SUBJECT or \
self._state == STATE_OUTERMOST or \
self._state == STATE_NOT_RDF: # akuchlin@mems-exchange.org 2002-09-11
pass
else:
raise RuntimeError, ("Unknown RDF parser state '%s' in end tag" % self._state, self._stack)
# c1 = self._context
# if self._subject is c1 and self_context is not c1:
# self._subject = self._subject.close() # close before use
l = self._stack.pop() #
self._state = l[0]
self._context = l[1]
self._predicate = l[2]
self._subject = l[3]
if self._delayedStatement != None:
if self._delayedStatement == 1:
pass
# progress("Delayed subject "+`self._subject`)
# self._subject = self._subject.close()
else:
c, p, s, o = self._delayedStatement
o = o.close()
self.sink.makeStatement((c, p, s, o), why=self._reason2)
self._delayedStatement = None
self._delayedStatement = l[4]
self._base = l[5]
self.flush()
# print '\nend tag: </' + tag + '>'
def endDocument(self, f=None):
self.flush()
self.sink.endDoc(self._formula)
def literal_element_start(self, name, qname, attrs):
declared = self.LiteralNS[-1].copy()
self.LiteralNS.append(declared)
nsMap = self._prefixMap[-1]
if name[0]:
prefix = nsMap[name[0]]
if prefix:
self.testdata += "<%s:%s" % (prefix, name[1])
else:
self.testdata += "<%s" % name[1]
for ns in [name] + attrs.keys():
ns = ns[0]
if not ns in declared:
prefix = nsMap.get(ns, None)
if prefix is None:
columnNumber = self._p.getColumnNumber()
lineNumber = self._p.getLineNumber()
where = "Undefined namespace '%s' parsing XML at column %i in line %i of <%s>\n\t" % (
ns, columnNumber, lineNumber, self._thisDoc)
raise SyntaxError(where + sys.exc_info()[1].__str__())
declared[ns] = prefix
if prefix:
self.testdata += (' xmlns:%s="%s"' % (prefix, ns))
else:
self.testdata += (' xmlns="%s"' % ns)
else:
self.testdata += "<%s" % name[1]
for (name, value) in attrs.items():
if name[0]:
name = declared[name[0]] + ":" + name[1]
else:
name = name[1]
self.testdata += (' %s=%s' % (name, quoteattr(value)))
self.testdata += ">"
def literal_element_start_DOM(self, name, qname, attrs):
declared = self.LiteralNS[-1].copy()
declared[u'http://www.w3.org/XML/1998/namespace'] = 'xml'
self.LiteralNS.append(declared)
nsMap = self._prefixMap[-1]
if name[0]:
prefix = nsMap[name[0]]
if prefix:
e = self.domDocument.createElementNS(name[0], prefix + ':' + name[1])
else:
e = self.domDocument.createElementNS(name[0], name[1])
for ns in [name] + attrs.keys():
ns = ns[0]
if ns and not ns in declared:
prefix = nsMap.get(ns, None)
if prefix is None:
columnNumber = self._p.getColumnNumber()
lineNumber = self._p.getLineNumber()
where = "Undefined namespace '%s' parsing XML at column %i in line %i of <%s>\n\t" % (
ns, columnNumber, lineNumber, self._thisDoc)
raise SyntaxError(where + sys.exc_info()[1].__str__())
declared[ns] = prefix
if prefix:
# self.testdata += (' xmlns:%s="%s"' % (prefix, ns))
e.setAttribute('xmlns:'+prefix, ns) # use setAttributeNS? What NS?
else:
# self.testdata += (' xmlns="%s"' % ns)
e.setAttribute('xmlns', ns)
else:
e = self.domDocument.createElement(name[1])
self.domElement.appendChild(e)
self.domElement = e
# progress("@@@ self.domElement.namespaceURI=", self.domElement.namespaceURI)
for (name, value) in attrs.items():
if name[0]:
e.setAttributeNS(name[0], declared[name[0]] + ":" + name[1], value)
else:
e.setAttributeNS(None, name[1], value)
def literal_element_start_DOM_OLD(self, name, qname, attrs):
declared = self.LiteralNS[-1].copy()
self.LiteralNS.append(declared)
nsMap = self._prefixMap[-1]
if name[0]:
e = self.domDocument.createElementNS(name[0], name[1])
# progress("@@@ XML literal name: ", name)
else:
e = self.domDocument.createElement(name[1])
self.domElement.appendChild(e)
self.domElement = e
# progress("@@@ self.domElement.namespaceURI=", self.domElement.namespaceURI)
for (name, value) in attrs.items():
if name[0]:
e.setAttributeNS(name[0],name[1], value)
else:
e.setAttribute(name[1], value) #@@@ Missing prefix on qname
#@@@ may need calculating as in the non-dom case, alas.
def literal_element_end(self, name, qname):
if name[0]:
prefix = self._prefixMap[-1][name[0]]
if prefix:
end = u"</%s:%s>" % (prefix, name[1])
else:
end = u"</%s>" % name[1]
else:
end = u"</%s>" % name[1]
self.testdata += end
self.LiteralNS.pop()
def literal_element_end_DOM(self, name, qname):
self.domElement = self.domElement.parentNode
self.LiteralNS.pop()
class RDFXMLParser(RDFHandler):
"""XML/RDF parser based on sax XML interface"""
flagDocumentation = """
Flags to control RDF/XML INPUT (after --rdf=) follow:
S - Strict spec. Unknown parse type treated as Literal instead of error.
T - take foreign XML as transparent and parse any RDF in it
(default it is to ignore unless rdf:RDF at top level)
L - If non-rdf attributes have no namespace prefix, assume in local <#> namespace
D - Assume default namespace decalred as local document is assume xmlns=""
R - Do not require an outer <rdf:RDF>, treating the file as RDF content (opposite of T)
Note: The parser (sax2rdf) does not support reification, bagIds, or parseType=Literal.
It does support the rest of RDF inc. datatypes, xml:lang, and nodeIds.
"""
def __init__(self, sink, openFormula, thisDoc=None, flags="", why=None):
RDFHandler.__init__(self, sink, openFormula, thisDoc, flags=flags,
why=why)
assert (not sink) or (thisDoc is not None), "Need document URI at the moment, sorry"
p = xml.sax.make_parser()
p.setFeature(feature_namespaces, 1)
p.setContentHandler(self)
self._p = p
self.reason = why
def feed(self, data):
self._p.feed(data)
def loadStream(self, stream):
s = xml.sax.InputSource()
s.setByteStream(stream)
try:
self._p.parse(s)
except xml.sax._exceptions.SAXException, e:
# was: raise SyntaxError() which left no info as to what had happened
columnNumber = self._p.getColumnNumber()
lineNumber = self._p.getLineNumber()
where = "parsing XML at column %i in line %i of <%s>\n\t" % (
columnNumber, lineNumber, self._thisDoc)
raise SyntaxError(where + sys.exc_info()[1].__str__())
# self.close() don't do a second time - see endDocument
return self._formula
def close(self):
self._p.reset()
self.flush()
self.sink.endDoc(self._formula)
return self._formula
class XMLDOMParser(RDFXMLParser):
"""XML format to RDF Graph parser based on sax XML interface"""
def __init__(self, thisDoc=None, flags="", why=None):
RDFHandler.__init__(self, None, None, thisDoc, flags=flags,
why=why)
RDFXMLParser.__init__(self, None, None, thisDoc=thisDoc, flags=flags, why=why)
self._state = STATE_LITERAL
self._litDepth = 0
self.LiteralNS = [{}]
self._prefixMap = [{}]
self.testdata = ''
# self._datatype = self.sink.newSymbol("http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral")
self.domDocument = self.domImplementation.createDocument(
'http://www.w3.org/1999/02/22-rdf-syntax-ns', 'envelope', None) # @@ get rid of this somehow
self.domElement = self.domDocument.documentElement
# self._subject = self.sink.newSymbol(thisDoc)
# self.sink.makeStatement(( self._context,
# self.sink.newSymbol(pred),
# self._subject,
# self.sink.newSymbol(self.uriref(obj)) ), why=self._reason2)
class BadSyntax(SyntaxError):
def __init__(self, info, message):
self._info = info
self._message = message
def __str__(self):
return self._message
def XMLtoDOM(str):
p = XMLDOMParser("foobar:") # Shouldn't need Doc URI etc
p.feed(str)
return p.domElement
def test(args = None):
import sys, getopt
import notation3
from time import time
if not args:
args = sys.argv[1:]
opts, args = getopt.getopt(args, 'st')
klass = RDFHandler
do_time = 0
for o, a in opts:
if o == '-s':
klass = None #@@ default handler for speed comparison?
elif o == '-t':
do_time = 1
if args:
file = args[0]
else:
file = 'test.xml'
if file == '-':
f = sys.stdin