/usr/share/pyshared/swap/cwm_sparql.py is in python-swap 1.2.1-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Builtins for doing SPARQL queries in CWM
$Id: cwm_sparql.py,v 1.22 2007/11/18 02:01:56 syosi Exp $
"""
from swap.term import LightBuiltIn, Function, ReverseFunction, MultipleFunction,\
MultipleReverseFunction, typeMap, LabelledNode, \
CompoundTerm, N3Set, List, EmptyList, NonEmptyList, \
Symbol, Fragment, Literal, Term, AnonymousNode, HeavyBuiltIn, toBool
import diag
progress = diag.progress
from RDFSink import RDFSink
from set_importer import Set
import uripath
from toXML import XMLWriter
try:
from decimal import Decimal
except ImportError:
from local_decimal import Decimal
from term import ErrorFlag as MyError
SPARQL_NS = 'http://www.w3.org/2000/10/swap/sparqlCwm'
class BI_truthValue(LightBuiltIn):
def eval(self, subj, obj, queue, bindings, proof, query):
if isinstance(subj, Literal):
## print '%s makes %s' % (subj, toBool(str(subj), subj.datatype.fragid))
## print '%s makes %s' % (obj, toBool(str(obj), obj.datatype.fragid))
## print 'I got here on %s, %s, returning %s' % (subj, obj, toBool(str(subj), subj.datatype.fragid) is toBool(str(obj), obj.datatype.fragid))
return toBool(str(subj), subj.datatype) is toBool(str(obj), obj.datatype)
raise TypeError("%s type cannot be converted to boolean" % `subj.__class`)
class BI_typeErrorIsTrue(LightBuiltIn):
"""
Subject is anything (must be bound. 1 works well)
Object is a formula containing the test as its only triple
"""
def eval(self, subj, obj, queue, bindings, proof, query):
if len(obj) != 1:
raise TypeError
statement = obj.statements[0]
try:
return statement.predicate().eval(statement.subject(), statement.object(), queue, bindings, proof, query)
except:
return True
class BI_typeErrorReturner(LightBuiltIn, Function):
def evalObj(self, subj, queue, bindings, proof, query):
if len(subj) != 1:
raise TypeError
statement = subj.statements[0]
try:
return statement.predicate().evalObj(statement.subject(), queue, bindings, proof, query)
except:
return MyError()
class BI_equals(LightBuiltIn, Function, ReverseFunction):
def eval(self, subj, obj, queue, bindings, proof, query):
xsd = self.store.integer.resource
if isinstance(subj, Symbol) and isinstance(obj, Symbol):
return subj is obj
if isinstance(subj, Fragment) and isinstance(obj, Fragment):
return subj is obj
if isinstance(subj, Literal) and isinstance(obj, Literal):
if subj.datatype == xsd['boolean'] or obj.datatype == xsd['boolean']:
return (toBool(str(subj), subj.datatype.resource is xsd and subj.datatype.fragid or None) ==
toBool(str(obj), obj.datatype.resource is xsd and obj.datatype.fragid or None))
if not subj.datatype and not obj.datatype:
return str(subj) == str(obj)
if subj.datatype.fragid in typeMap and obj.datatype.fragid in typeMap:
return subj.value() == obj.value()
if subj.datatype != obj.datatype:
raise TypeError(subj, obj)
return str(subj) == str(obj)
raise TypeError(subj, obj)
def evalSubj(self, obj, queue, bindings, proof, query):
return obj
def evalObj(self,subj, queue, bindings, proof, query):
return subj
class BI_lessThan(LightBuiltIn):
def evaluate(self, subject, object):
return (subject < object)
class BI_greaterThan(LightBuiltIn):
def evaluate(self, subject, object):
return (subject > object)
class BI_notGreaterThan(LightBuiltIn):
def evaluate(self, subject, object):
return (subject <= object)
class BI_notLessThan(LightBuiltIn):
def evaluate(self, subject, object):
return (subject >= object)
class BI_notEquals(LightBuiltIn):
def eval(self, subj, obj, queue, bindings, proof, query):
return not self.store.newSymbol(SPARQL_NS)['equals'].eval(subj, obj, queue, bindings, proof, query)
class BI_dtLit(LightBuiltIn, Function, ReverseFunction):
def evalObj(self,subj, queue, bindings, proof, query):
subj = [a for a in subj]
if len(subj) != 2:
raise ValueError
subject, datatype = subj
if not isinstance(subj, Literal) or not isinstance(datatype, LabelledNode):
raise TypeError
if subj.datatype:
raise TypeError('%s must not have a type already' % subj)
return self.store.newLiteral(str(subj), dt=datatype)
def evalSubj(self, obj, queue, bindings, proof, query):
if not isinstance(obj, Literal):
raise TypeError('I can only find the datatype of a Literal, not a %s' % `obj.__class__.__name__`)
return self.store.newList([self.store.newLiteral(str(obj)), obj.datatype])
class BI_langLit(LightBuiltIn, Function, ReverseFunction):
def evalObj(self,subj, queue, bindings, proof, query):
subj = [a for a in subj]
if len(subj) != 2:
raise ValueError
subject, lang = subj
if not isinstance(subj, Literal) or not isinstance(lang, Literal):
raise TypeError
if not lang:
lang = None
else:
lang = str(lang)
if subj.lang:
raise TypeError('%s must not have a lang already' % subj)
return self.store.newLiteral(str(subj), lang=lang)
def evalSubj(self, obj, queue, bindings, proof, query):
if not isinstance(obj, Literal):
raise TypeError('I can only find the datatype of a Literal, not a %s' % `obj.__class__.__name__`)
lang = obj.lang
if not obj.lang:
lang = ''
return self.store.newList([self.store.newLiteral(str(obj)), self.store.newLiteral(lang)])
class BI_lamePred(HeavyBuiltIn, MultipleReverseFunction):
def eval(self, subj, obj, queue, bindings, proof, query):
return True
def evalSubj(self, obj, queue, bindings, proof, query):
#really slow. Return every list I know anything about. Should I do this at all?
retVals = Set([self.store.nil])
retValCopy = Set()
n = 0
while retVals != retValCopy:
print n, retVals, retValCopy
n += 1
retValCopy = retVals.copy()
for node in retValCopy:
retVals.update(node._prec.values())
a = query.workingContext.occurringIn(retVals) ## Really slow. Need to generate this on the fly?
print 'a=', a
return a
#############################
#############################
# Builtins useful from within cwm, not within SPARQL
#
#############################
#############################
class BI_query(LightBuiltIn, Function):
def evalObj(self,subj, queue, bindings, proof, query):
from query import applySparqlQueries
ns = self.store.newSymbol(SPARQL_NS)
assert isinstance(subj, List)
subj = [a for a in subj]
assert len(subj) == 2
source, query = subj
F = self.store.newFormula()
applySparqlQueries(source, query, F)
if query.contains(obj=ns['ConstructQuery']):
return F
if query.contains(obj=ns['SelectQuery']) or query.contains(obj=ns['AskQuery']):
return self.store.newLiteral(sparql_output(query, F))
def bnode_replace(self, string):
if string in self:
return self[string]
hash = string.find('#')
base = string[:hash]
self[string] = base + '#_bnode_' + str(self['counter'])
self['counter'] += 1
return self[string]
bnode_replace = bnode_replace.__get__({'counter':0})
def sparql_output(query, F):
store = F.store
RESULTS_NS = 'http://www.w3.org/2005/sparql-results#'
ns = store.newSymbol(SPARQL_NS)
if query.contains(obj=ns['SelectQuery']):
node = query.the(pred=store.type, obj=ns['SelectQuery'])
outputList = []
prefixTracker = RDFSink()
prefixTracker.setDefaultNamespace(RESULTS_NS)
prefixTracker.bind('', RESULTS_NS)
xwr = XMLWriter(outputList.append, prefixTracker)
xwr.makePI('xml version="%s"' % '1.0')
xwr.startElement(RESULTS_NS+'sparql', [], prefixTracker.prefixes)
xwr.startElement(RESULTS_NS+'head', [], prefixTracker.prefixes)
vars = []
for triple in query.the(subj=node, pred=ns['select']):
vars.append(triple.object())
xwr.emptyElement(RESULTS_NS+'variable', [(RESULTS_NS+' name', str(triple.object()))], prefixTracker.prefixes)
xwr.endElement()
xwr.startElement(RESULTS_NS+'results', [], prefixTracker.prefixes)
resultFormulae = [aa for aa in F.each(pred=store.type, obj=ns['Result'])]
try:
resultFormulae.sort(Term.compareAnyTerm)
except:
print [type(x) for x in resultFormulae]
print Term
raise
for resultFormula in resultFormulae:
xwr.startElement(RESULTS_NS+'result', [], prefixTracker.prefixes)
for var in vars:
binding = resultFormula.the(pred=ns['bound'], obj=var)
if binding:
xwr.startElement(RESULTS_NS+'binding', [(RESULTS_NS+' name', str(var))], prefixTracker.prefixes)
if isinstance(binding, LabelledNode):
xwr.startElement(RESULTS_NS+'uri', [], prefixTracker.prefixes)
xwr.data(binding.uriref())
xwr.endElement()
elif isinstance(binding, (AnonymousNode, List)):
xwr.startElement(RESULTS_NS+'bnode', [], prefixTracker.prefixes)
xwr.data(bnode_replace(binding.uriref()))
xwr.endElement()
elif isinstance(binding, Literal):
props = []
if binding.datatype:
props.append((RESULTS_NS+' datatype', binding.datatype.uriref()))
if binding.lang:
props.append(("http://www.w3.org/XML/1998/namespace lang", binding.lang))
xwr.startElement(RESULTS_NS+'literal', props, prefixTracker.prefixes)
xwr.data(unicode(binding))
xwr.endElement()
xwr.endElement()
else:
pass
xwr.endElement()
xwr.endElement()
xwr.endElement()
xwr.endDocument()
return u''.join(outputList)
if query.contains(obj=ns['AskQuery']):
node = query.the(pred=store.type, obj=ns['AskQuery'])
outputList = []
prefixTracker = RDFSink()
prefixTracker.setDefaultNamespace(RESULTS_NS)
prefixTracker.bind('', RESULTS_NS)
xwr = XMLWriter(outputList.append, prefixTracker)
xwr.makePI('xml version="%s"' % '1.0')
xwr.startElement(RESULTS_NS+'sparql', [], prefixTracker.prefixes)
xwr.startElement(RESULTS_NS+'head', [], prefixTracker.prefixes)
vars = []
# for triple in query.the(subj=node, pred=ns['select']):
# vars.append(triple.object())
# xwr.emptyElement(RESULTS_NS+'variable', [(RESULTS_NS+'name', str(triple.object()))], prefixTracker.prefixes)
xwr.endElement()
xwr.startElement(RESULTS_NS+'boolean', [], prefixTracker.prefixes)
if F.the(pred=store.type, obj=ns['Success']):
xwr.data('true')
else:
xwr.data('false')
xwr.endElement()
xwr.endElement()
xwr.endDocument()
return ''.join(outputList)
def sparql_queryString(source, queryString):
from query import applySparqlQueries
store = source.store
ns = store.newSymbol(SPARQL_NS)
from sparql import sparql_parser
import sparql2cwm
convertor = sparql2cwm.FromSparql(store)
import StringIO
p = sparql_parser.N3Parser(StringIO.StringIO(queryString), sparql_parser.branches, convertor)
q = p.parse(sparql_parser.start).close()
F = store.newFormula()
applySparqlQueries(source, q, F)
F = F.close()
## print 'result is ', F
## print 'query is ', q.n3String()
return outputString(q, F)
def outputString(q, F):
store = q.store
ns = store.newSymbol(SPARQL_NS)
if q.contains(obj=ns['ConstructQuery']):
return F.rdfString().decode('utf_8'), 'application/rdf+xml'
if q.contains(obj=ns['SelectQuery']) or q.contains(obj=ns['AskQuery']):
return sparql_output(q, F), 'application/sparql-results+xml'
class BI_semantics(HeavyBuiltIn, Function):
""" The semantics of a resource are its machine-readable meaning, as an
N3 forumula. The URI is used to find a represnetation of the resource in bits
which is then parsed according to its content type."""
def evalObj(self, subj, queue, bindings, proof, query):
store = subj.store
if isinstance(subj, Fragment): doc = subj.resource
else: doc = subj
F = store.any((store._experience, store.semantics, doc, None))
if F != None:
if diag.chatty_flag > 10: progress("Already read and parsed "+`doc`+" to "+ `F`)
return F
if diag.chatty_flag > 10: progress("Reading and parsing " + doc.uriref())
inputURI = doc.uriref()
F = self.store.load(inputURI, contentType="x-application/sparql")
if diag.chatty_flag>10: progress(" semantics: %s" % (F))
if diag.tracking:
proof.append(F.collector)
return F.canonicalize()
def register(store):
ns = store.newSymbol(SPARQL_NS)
ns.internFrag('equals', BI_equals)
ns.internFrag('lessThan', BI_lessThan)
ns.internFrag('greaterThan', BI_greaterThan)
ns.internFrag('notGreaterThan', BI_notGreaterThan)
ns.internFrag('notLessThan', BI_notLessThan)
ns.internFrag('notEquals', BI_notEquals)
ns.internFrag('typeErrorIsTrue', BI_typeErrorIsTrue)
ns.internFrag('typeErrorReturner', BI_typeErrorReturner)
ns.internFrag('truthValue', BI_truthValue)
ns.internFrag('lamePred', BI_lamePred)
ns.internFrag('query', BI_query)
ns.internFrag('semantics', BI_semantics)
ns.internFrag('dtLit', BI_dtLit)
ns.internFrag('langLit', BI_langLit)
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