/usr/share/pyshared/swap/llyn.py is in python-swap 1.2.1-5.
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$Id: llyn.py,v 1.185 2007/12/11 21:18:08 syosi Exp $
RDF Store and Query engine
Logic Lookup: Yet another Name
(also, in Wales, a lake - a storage area at the centre of the valley?)
This is an engine which knows a certian amount of stuff and can manipulate it.
It is a (forward chaining) query engine, not an (backward chaining) inference engine:
that is, it will apply all rules it can
but won't figure out which ones to apply to prove something. It is not
optimized particularly.
Used by cwm - the closed world machine.
See: http://www.w3.org/DesignIssues/Notation3
Interfaces
==========
This store stores many formulae, where one formula is what in
straight RDF implementations is known as a "triple store".
So look at the Formula class for a triple store interface.
See also for comparison, a python RDF API for the Redland library (in C):
http://www.redland.opensource.ac.uk/docs/api/index.html
and the redfoot/rdflib interface, a python RDF API:
http://rdflib.net/latest/doc/triple_store.html
Copyright () 2000-2004 World Wide Web Consortium, (Massachusetts Institute
of Technology, European Research Consortium for Informatics and Mathematics,
Keio University). All Rights Reserved. This work is distributed under the
W3C Software License [1] in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE.
"""
# emacsbug="""emacs got confused by long string above"""
from __future__ import generators
# see http://www.amk.ca/python/2.2/index.html#SECTION000500000000000000000
from set_importer import Set, ImmutableSet
import types
import string
import re
import StringIO
import sys
import time, xml
from warnings import warn
import urllib # for log:content
import md5, binascii # for building md5 URIs
import uripath
from uripath import canonical
from sax2rdf import XMLtoDOM
import xml.dom.minidom
from why import smushedFormula, Premise, newTopLevelFormula, isTopLevel
import notation3 # N3 parsers and generators, and RDF generator
from webAccess import webget
import diag # problems importing the tracking flag,
# and chatty_flag must be explicit it seems: use diag.tracking
from diag import progress, verbosity, tracking
from term import BuiltIn, LightBuiltIn, RDFBuiltIn, HeavyBuiltIn, Function, \
MultipleFunction, ReverseFunction, MultipleReverseFunction, \
Literal, XMLLiteral, Symbol, Fragment, FragmentNil, Term, LabelledNode, \
CompoundTerm, List, EmptyList, NonEmptyList, AnonymousNode, N3Set, \
UnknownType
from formula import Formula, StoredStatement
import reify
from weakref import WeakValueDictionary
from query import think, applyRules, testIncludes
import webAccess
from webAccess import DocumentAccessError
from local_decimal import Decimal
from RDFSink import Logic_NS, RDFSink, forSomeSym, forAllSym
from RDFSink import CONTEXT, PRED, SUBJ, OBJ, PARTS, ALL4
from RDFSink import N3_nil, N3_first, N3_rest, OWL_NS, N3_Empty, N3_List, \
N3_li, List_NS
from RDFSink import RDF_NS_URI
from RDFSink import FORMULA, LITERAL, LITERAL_DT, LITERAL_LANG, ANONYMOUS, SYMBOL
from pretty import Serializer
LITERAL_URI_prefix = "data:application/rdf+n3-literal;"
Delta_NS = "http://www.w3.org/2004/delta#"
cvsRevision = "$Revision: 1.185 $"
# Magic resources we know about
from RDFSink import RDF_type_URI, DAML_sameAs_URI
from why import Because, BecauseBuiltIn, BecauseOfRule, \
BecauseOfExperience, becauseSubexpression, BecauseMerge ,report
STRING_NS_URI = "http://www.w3.org/2000/10/swap/string#"
META_NS_URI = "http://www.w3.org/2000/10/swap/meta#"
INTEGER_DATATYPE = "http://www.w3.org/2001/XMLSchema#integer"
FLOAT_DATATYPE = "http://www.w3.org/2001/XMLSchema#double"
DECIMAL_DATATYPE = "http://www.w3.org/2001/XMLSchema#decimal"
BOOL_DATATYPE = "http://www.w3.org/2001/XMLSchema#boolean"
#reason=Namespace("http://www.w3.org/2000/10/swap/reason#")
META_mergedWith = META_NS_URI + "mergedWith"
META_source = META_NS_URI + "source"
META_run = META_NS_URI + "run"
doMeta = 0 # wait until we have written the code! :-)
class DataObject:
"""The info about a term in the context of a specific formula
It is created by being passed the formula and the term, and is
then accessed like a python dictionary of sequences of values. Example:
F = myWorkingFormula
x = F.theObject(pred=rdfType obj=fooCar)
for y in x[color][label]
"""
def __init__(context, term):
self.context = context
self.term = term
def __getItem__(pred): # Use . or [] ?
values = context.objects(pred=pred, subj=self.term)
for v in value:
yield DataObject(self.context, v)
def arg_hash(arg):
if isinstance(arg, dict):
g = []
for k, v in arg.items():
g.append((arg_hash(k), arg_hash(v)))
return hash(tuple(g))
if isinstance(arg, (tuple, list)):
g = []
for k in arg:
g.append(arg_hash(k))
return hash(tuple(g))
if isinstance(arg, Set):
g = []
for k in arg:
g.append(arg_hash(k))
return hash(ImmutableSet(g))
return hash(arg)
def memoize(f):
mymap = {}
def k(*args, **keywords):
n = arg_hash((args, keywords))
if n not in mymap:
mymap[n] = f(*args, **keywords)
else:
if diag.chatty_flag > 10:
progress("momoizing helped!")
return mymap[n]
return k
####
### BCHAIN @@@ Is this the right way to do it?
####
BACKWARD_CHAINING = False
class VARHASH(object):
def __repr__(self): return 'VAR'
def __str__(self): return 'VAR'
VARHASH = VARHASH()
####
### /BCHAIN
####
###################################### Forumula
#
class IndexedFormula(Formula):
"""A formula which has indexes to facilitate queries.
A formula is either open or closed. Initially, it is open. In this
state is may be modified - for example, triples may be added to it.
When it is closed, note that a different interned version of itself
may be returned. From then on it is a constant.
Only closed formulae may be mentioned in statements in other formuale.
There is a reopen() method but it is not recommended, and if desperate should
only be used immediately after a close().
"""
def __init__(self, store, uri=None):
Formula.__init__(self, store, uri)
# self._redirections = {}
self.descendents = None # Placeholder for list of closure under subcontext
# self.collector = None # Object collecting evidence, if any
self._newRedirections = {} # not subsituted yet
self._index = {}
self._index[(None,None,None)] = self.statements
self._closureMode = ""
self._closureAgenda = []
self._closureAlready = []
self.reallyCanonical = False
def statementsMatching(self, pred=None, subj=None, obj=None):
"""Return a READ-ONLY list of StoredStatement objects matching the parts given
For example:
for s in f.statementsMatching(pred=pantoneColor):
print "We've got one which is ", `s[OBJ]`
If none, returns []
"""
return self._index.get((pred, subj, obj), [])
def contains(self, pred=None, subj=None, obj=None):
"""Return boolean true iff formula contains statement(s) matching the parts given
For example:
if f.contains(pred=pantoneColor):
print "We've got one statement about something being some color"
"""
x = self._index.get((pred, subj, obj), [])
if x : return 1
return 0
def any(self, subj=None, pred=None, obj=None):
"""Return None or the value filing the blank in the called parameters.
Specifiy exactly two of the arguments.
color = f.any(pred=pantoneColor, subj=myCar)
somethingRed = f.any(pred=pantoneColor, obj=red)
Note difference from the old store.any!!
Note SPO order not PSO.
To aboid confusion, use named parameters.
"""
hits = self._index.get((pred, subj, obj), [])
if not hits: return None
s = hits[0]
if pred is None: return s[PRED]
if subj is None: return s[SUBJ]
if obj is None: return s[OBJ]
raise ParameterError("You must give one wildcard")
def the(self, subj=None, pred=None, obj=None):
"""Return None or the value filing the blank in the called parameters
This is just like any() except it checks that there is only
one answer in the store. It wise to use this when you expect only one.
color = f.the(pred=pantoneColor, subj=myCar)
redCar = f.the(pred=pantoneColor, obj=red)
"""
hits = self._index.get((pred, subj, obj), [])
if not hits: return None
assert len(hits) == 1, """There should only be one match for (%s %s %s).
Found: %s""" %(subj, pred, obj, self.each(subj, pred, obj))
s = hits[0]
if pred is None: return s[PRED]
if subj is None: return s[SUBJ]
if obj is None: return s[OBJ]
raise parameterError("You must give one wildcard using the()")
def each(self, subj=None, pred=None, obj=None):
"""Return a list of values value filing the blank in the called parameters
Examples:
colors = f.each(pred=pantoneColor, subj=myCar)
for redthing in f.each(pred=pantoneColor, obj=red): ...
"""
hits = self._index.get((pred, subj, obj), [])
if hits == []: return []
if pred is None: wc = PRED
elif subj is None: wc = SUBJ
elif obj is None: wc = OBJ
else: raise ParameterError("You must give one wildcard None for each()")
res = []
for s in hits:
res.append(s[wc]) # should use yeild @@ when we are ready
return res
def searchable(self, subj=None, pred=None, obj=None):
"""A pair of the difficulty of searching and a statement iterator of found statements
The difficulty is a store-portable measure of how long the store
thinks (in arbitrary units) it will take to search.
This will only be used for choisng which part of the query to search first.
If it is 0 there is no solution to the query, we know now.
In this implementation, we use the length of the sequence to be searched."""
res = self._index.get((pred, subj, obj), [])
# progress("searchable %s, %s" %(self.statements, (pred, subj, obj))
return len(res), res
def add(self, subj, pred, obj, why=None):
"""Add a triple to the formula.
The formula must be open.
subj, pred and obj must be objects as for example generated by Formula.newSymbol()
and newLiteral(), or else literal values which can be interned.
why may be a reason for use when a proof will be required.
"""
if self.canonical != None:
raise RuntimeError("Attempt to add statement to closed formula "+`self`)
store = self.store
if not isinstance(subj, Term): subj = store.intern(subj)
if not isinstance(pred, Term): pred = store.intern(pred)
if not isinstance(obj, Term): obj = store.intern(obj)
newBindings = {}
# Smushing of things which are equal into a single node
# Even if we do not do this with owl:sameAs, we do with lists
subj = subj.substituteEquals(self._redirections, newBindings)
pred = pred.substituteEquals(self._redirections, newBindings)
obj = obj.substituteEquals(self._redirections, newBindings)
if diag.chatty_flag > 90:
progress(u"Add statement (size before %i, %i statements) to %s:\n {%s %s %s}" % (
self.store.size, len(self.statements),`self`, `subj`, `pred`, `obj`) )
if self.statementsMatching(pred, subj, obj):
if diag.chatty_flag > 97:
progress("Add duplicate SUPPRESSED %s: {%s %s %s}" % (
self, subj, pred, obj) )
return 0 # Return no change in size of store
assert not isinstance(pred, Formula) or pred.canonical is pred, "pred Should be closed"+`pred`
assert (not isinstance(subj, Formula)
or subj is self
or subj.canonical is subj), "subj Should be closed or self"+`subj`
assert not isinstance(obj, Formula) or obj.canonical is obj, "obj Should be closed"+`obj`+`obj.canonical`
store.size = store.size+1 # rather nominal but should be monotonic
if False and isTopLevel(self):
if isinstance(subj, Formula) and not subj.reallyCanonical:
raise RuntimeError(subj.debugString())
if isinstance(obj, Formula) and not obj.reallyCanonical:
raise RuntimeError(obj.debugString())
# We collapse lists from the declared daml first,rest structure into List objects.
# To do this, we need a bnode with (a) a first; (b) a rest, and (c) the rest being a list.
# We trigger list collapse on any of these three becoming true.
# @@@ we don't reverse this on remove statement. Remove statement is really not a user call.
# (Not clear: how t smush symbols without smushing variables. Need separate python class
# for variables I guess as everyone has been saying.
# When that happens, expend smushing to symbols.)
if pred is store.rest:
if isinstance(obj, List) and subj in self._existentialVariables:
ss = self.statementsMatching(pred=store.first, subj=subj)
if ss:
s = ss[0]
self.removeStatement(s)
first = s[OBJ]
list = obj.prepend(first)
self._noteNewList(subj, list, newBindings)
self.substituteEqualsInPlace(newBindings, why=why)
return 1 # Added a statement but ... it is hidden in lists
elif pred is store.first and subj in self._existentialVariables:
ss = self.statementsMatching(pred=store.rest, subj=subj)
if ss:
s = ss[0]
rest = s[OBJ]
if isinstance(rest, List):
list = rest.prepend(obj)
self.removeStatement(s)
self._noteNewList(subj, list, newBindings)
self.substituteEqualsInPlace(newBindings)
return 1
if pred is store.owlOneOf:
if isinstance(obj, List) and subj in self._existentialVariables:
new_set = store.newSet(obj)
self._noteNewSet(subj, new_set, newBindings)
self.substituteEqualsInPlace(newBindings)
return 1
if "e" in self._closureMode:
if pred is store.sameAs:
if subj is obj: return 0 # ignore a = a
if obj in self.existentials() and subj not in self.existentials():
var, val = obj, subj
elif ((subj in self.existentials() and obj not in self.existentials())
or (subj.generated() and not obj.generated())
or Term.compareAnyTerm(obj, subj) < 0): var, val = subj, obj
else: var, val = obj, subj
newBindings[var] = val
if diag.chatty_flag > 90: progress("Equality: %s = %s" % (`var`, `val`))
self.substituteEqualsInPlace(newBindings)
return 1
if "T" in self._closureMode:
if pred is store.type and obj is store.Truth:
assert isinstance(subj, Formula), "What are we doing concluding %s is true?" % subj
subj.resetRenames(True)
self.loadFormulaWithSubstitution(subj.renameVars())
subj.resetRenames(False)
#########
if newBindings != {}:
self.substituteEqualsInPlace(newBindings)
#######
s = StoredStatement((self, pred, subj, obj))
if diag.tracking:
if (why is None): raise RuntimeError(
"Tracking reasons but no reason given for"+`s`)
report(s, why)
# Build 8 indexes.
# This now takes a lot of the time in a typical cwm run! :-(
# I honestly think the above line is a bit pessemistic. The below lines scale.
# The above lines do not (removeStatement does not scale)
if subj is self: # Catch variable declarations
if pred is self.store.forAll:
if obj not in self._universalVariables:
if diag.chatty_flag > 50: progress("\tUniversal ", obj)
self._universalVariables.add(obj)
return 1
if pred is self.store.forSome:
if obj not in self._existentialVariables:
if diag.chatty_flag > 50: progress("\tExistential ", obj)
self._existentialVariables.add(obj)
return 1
raise ValueError("You cannot use 'this' except as subject of forAll or forSome")
self.statements.append(s)
list = self._index.get((None, None, obj), None)
if list is None: self._index[(None, None, obj)]=[s]
else: list.append(s)
list = self._index.get((None, subj, None), None)
if list is None: self._index[(None, subj, None)]=[s]
else: list.append(s)
list = self._index.get((None, subj, obj), None)
if list is None: self._index[(None, subj, obj)]=[s]
else: list.append(s)
list = self._index.get((pred, None, None), None)
if list is None: self._index[(pred, None, None)]=[s]
else: list.append(s)
rein = self.newSymbol('http://dig.csail.mit.edu/2005/09/rein/network#requester')
list = self._index.get((pred, None, obj), None)
if list is None: self._index[(pred, None, obj)]=[s]
else: list.append(s)
list = self._index.get((pred, subj, None), None)
if list is None: self._index[(pred, subj, None)]=[s]
else: list.append(s)
list = self._index.get((pred, subj, obj), None)
if list is None: self._index[(pred, subj, obj)]=[s]
else: list.append(s)
if self._closureMode != "":
self.checkClosure(subj, pred, obj)
try:
if self.isWorkingContext and diag.chatty_flag > 20:
progress("adding", (subj, pred, obj))
except:
pass
return 1 # One statement has been added @@ ignore closure extras from closure
# Obsolete this return value? @@@
def removeStatement(self, s):
"""Removes a statement The formula must be open.
This implementation is alas slow, as removal of items from tha hash is slow.
The above statement is false. Removing items from a hash is easily over five times
faster than removing them from a list.
Also, truth mainainance is not done. You can't undeclare things equal.
This is really a low-level method, used within add() and for cleaning up the store
to save space in purge() etc.
"""
assert self.canonical is None, "Cannot remove statement from canonnical"+`self`
self.store.size = self.store.size-1
if diag.chatty_flag > 97: progress("removing %s" % (s))
context, pred, subj, obj = s.quad
self.statements.remove(s)
self._index[(None, None, obj)].remove(s)
self._index[(None, subj, None)].remove(s)
self._index[(None, subj, obj)].remove(s)
self._index[(pred, None, None)].remove(s)
self._index[(pred, None, obj)].remove(s)
self._index[(pred, subj, None)].remove(s)
self._index[(pred, subj, obj)].remove(s)
#raise RuntimeError("The triple is %s: %s %s %s"%(context, pred, subj, obj))
return
def newCanonicalize(F): ## Horrible name!
if self._hashval is not None:
return
from term import Existential, Universal
statements = []
def convert(n):
if isinstance(n, Universal):
return Universal
if isinstance(n, Existential):
return Existential
return n
for statement in self.statements:
statements.append(tuple([convert(x) for x in statement]))
self._hashval = hash(ImmutableSet(statements))
def canonicalize(F, cannon=False):
"""If this formula already exists, return the master version.
If not, record this one and return it.
Call this when the formula is in its final form, with all its
statements. Make sure no one else has a copy of the pointer to the
smushed one. In canonical form,
- the statments are ordered
- the lists are all internalized as lists
Store dependency: Uses store._formulaeOfLength
"""
if diag.chatty_flag > 70:
progress('I got here')
store = F.store
if F.canonical != None:
if diag.chatty_flag > 70:
progress("End formula -- @@ already canonical:"+`F`)
return F.canonical
if F.stayOpen:
if diag.chatty_flag > 70:
progress("Canonicalizion ignored: @@ Knowledge base mode:"+`F`)
return F
F.store._equivalentFormulae.add(F)
if (diag.tracking and isTopLevel(F)) or (F._renameVarsMaps and not cannon): ## we are sitting in renameVars --- don't bother
F.canonical = F
return F
fl = F.statements
l = len(fl), len(F.universals()), len(F.existentials())
possibles = store._formulaeOfLength.get(l, None) # Any of same length
if possibles is None:
store._formulaeOfLength[l] = [F]
if diag.chatty_flag > 70:
progress("End formula - first of length", l, F)
F.canonical = F
F.reallyCanonical = True
return F
if diag.chatty_flag > 70:
progress('I got here, possibles = ', possibles)
fl.sort()
fe = F.existentials()
#fe.sort(Term.compareAnyTerm)
fu = F.universals ()
#fu.sort(Term.compareAnyTerm)
for G in possibles:
# progress("Just checking.\n",
# "\n", "_"*80, "\n", F.debugString(),
# "\n", "_"*80, "\n", G.debugString(),
# )
gl = G.statements
gkey = len(gl), len(G.universals()), len(G.existentials())
if gkey != l: raise RuntimeError("@@Key of %s is %s instead of %s"
%(G, `gkey`, `l`))
gl.sort()
for se, oe, in ((fe, G.existentials()),
(fu, G.universals())):
if se != oe:
break
for i in range(l[0]):
for p in PRED, SUBJ, OBJ:
if (fl[i][p] is not gl[i][p]):
# progress("""Mismatch on part %i on statement %i.
# Becaue %s is not %s"""
# % (p, i, `fl[i][p].uriref()`, `gl[i][p].uriref()`),
# )
# for x in (fl[i][p], gl[i][p]):
# progress("Class %s, id=%i" %(x.__class__, id(x)))
#
# if Formula.unify(F,G):
# progress("""Unifies but did not match on part %i on statement %i.
# Because %s is not %s"""
# % (p, i, `fl[i][p].uriref()`, `gl[i][p].uriref()`),
# "\n", "_"*80, "\n", F.debugString(),
# "\n", "_"*80, "\n", G.debugString()
# )
# raise RuntimeError("foundOne")
break # mismatch
else: #match one statement
continue
break
else: #match
# if not Formula.unify(F,G):
# raise RuntimeError("Look the same but don't unify")
if tracking: smushedFormula(F,G)
if diag.chatty_flag > 70: progress(
"** End Formula: Smushed new formula %s giving old %s" % (F, G))
F.canonical = G
del(F) # Make sure it ain't used again
return G
possibles.append(F)
F.canonical = F
F.reallyCanonical = True
if diag.chatty_flag > 70:
progress("End formula, a fresh one:"+`F`)
## for k in possibles:
## print 'one choice is'
## print k.n3String()
## print '--------\n--------'
## raise RuntimeError(F.n3String())
return F
def reopen(self):
"""Make a formula which was once closed oopen for input again.
NOT Recommended. Dangers: this formula will be, because of interning,
the same objet as a formula used elsewhere which happens to have the same content.
You mess with this one, you mess with that one.
Much better to keep teh formula open until you don't needed it open any more.
The trouble is, the parsers close it at the moment automatically. To be fixed."""
return self.store.reopen(self)
def setClosureMode(self, x):
self._closureMode = x
def checkClosure(self, subj, pred, obj):
"""Check the closure of the formula given new contents
The s p o flags cause llyn to follow those parts of the new statement.
i asks it to follow owl:imports
r ask it to follow doc:rules
"""
firstCall = (self._closureAgenda == [])
if "s" in self._closureMode: self.checkClosureOfSymbol(subj)
if "p" in self._closureMode: self.checkClosureOfSymbol(pred)
if ("o" in self._closureMode or
"t" in self._closureMode and pred is self.store.type):
self.checkClosureOfSymbol(obj)
if (("r" in self._closureMode and
pred is self.store.docRules) or
("i" in self._closureMode and
pred is self.store.imports)): # check subject? @@@ semantics?
self.checkClosureDocument(obj)
if firstCall:
while self._closureAgenda != []:
x = self._closureAgenda.pop()
self._closureAlready.append(x)
x.dereference("m" + self._closureMode, self)
def checkClosureOfSymbol(self, y):
if not isinstance(y, Fragment): return
return self.checkClosureDocument(y.resource)
def checkClosureDocument(self, x):
if x != None and x not in self._closureAlready and x not in self._closureAgenda:
self._closureAgenda.append(x)
def outputStrings(self, channel=None, relation=None):
"""Fetch output strings from store, sort and output
To output a string, associate (using the given relation) with a key
such that the order of the keys is the order in which you want the corresponding
strings output.
"""
if channel is None:
channel = sys.stdout
if relation is None:
relation = self.store.intern((SYMBOL, Logic_NS + "outputString"))
list = self.statementsMatching(pred=relation) # List of things of (subj, obj) pairs
pairs = []
for s in list:
pairs.append((s[SUBJ], s[OBJ]))
pairs.sort(comparePair)
for key, str in pairs:
if not hasattr(str, "string"):
print `str`
channel.write(str.string.encode('utf-8'))
def debugString(self, already=[]):
"""A simple dump of a formula in debug form.
This formula is dumped, using ids for nested formula.
Then, each nested formula mentioned is dumped."""
red = ""
if self._redirections != {}: red = " redirections:" + `self._redirections`
str = `self`+ red + unicode(id(self)) + " is {"
for vv, ss in ((self.universals().copy(), "@forAll"),(self.existentials().copy(), "@forSome")):
if vv != Set():
str = str + " " + ss + " " + `vv.pop()`
for v in vv:
str = str + ", " + `v`
str = str + "."
todo = []
for s in self.statements:
subj, pred, obj = s.spo()
str = str + "\n%28s %20s %20s ." % (`subj`, `pred`, `obj`)
for p in PRED, SUBJ, OBJ:
if (isinstance(s[p], CompoundTerm)
and s[p] not in already and s[p] not in todo and s[p] is not self):
todo.append(s[p])
str = str+ "}.\n"
already = already + todo + [ self ]
for f in todo:
str = str + " " + f.debugString(already)
return str
def _noteNewList(self, bnode, list, newBindings):
"""Note that we have a new list.
Check whether this new list (given as bnode) causes other things to become lists.
Set up redirection so the list is used from now on instead of the bnode.
Internal function.
This function is extraordinarily slow, .08 seconds per call on reify/reify3.n3"""
if diag.chatty_flag > 80: progress("New list was %s, now %s = %s"%(`bnode`, `list`, `list.value()`))
if isinstance(bnode, List): return ##@@@@@ why is this necessary? weid.
newBindings[bnode] = list
if diag.chatty_flag > 80: progress("...New list newBindings %s"%(`newBindings`))
self._existentialVariables.discard(bnode)
possibles = self.statementsMatching(pred=self.store.rest, obj=bnode) # What has this as rest?
for s in possibles[:]:
L2 = s[SUBJ]
ff = self.statementsMatching(pred=self.store.first, subj=L2)
if ff != []:
first = ff[0][OBJ]
self.removeStatement(s)
self.removeStatement(ff[0])
list2 = list.prepend(first)
self._noteNewList(L2, list2, newBindings)
possibleSets = self.statementsMatching(pred=self.store.owlOneOf, obj=bnode)
if possibleSets:
new_set = self.store.newSet(list)
for s in possibleSets[:]:
s2 = s[SUBJ]
if s2 in self._existentialVariables:
self.removeStatement(s)
self._noteNewSet(s2, new_set, newBindings)
return
def _noteNewSet(self, bnode, set, newBindings):
newBindings[bnode] = set
if diag.chatty_flag > 80: progress("...New set newBindings %s"%(`newBindings`))
self._existentialVariables.discard(bnode)
def substituteEqualsInPlace(self, redirections, why=None):
"""Slow ... does not use indexes"""
bindings = redirections
while bindings != {}:
self._redirections.update(bindings)
newBindings = {}
for s in self.statements[:]: # take a copy!
changed = 0
quad = [self, s[PRED], s[SUBJ], s[OBJ]]
for p in PRED, SUBJ, OBJ:
x = s[p]
y = x.substituteEquals(bindings, newBindings)
if y is not x:
if diag.chatty_flag>90: progress("Substituted %s -> %s in place" %(x, y))
changed = 1
quad[p] = y
if changed:
self.removeStatement(s)
self.add(subj=quad[SUBJ], pred=quad[PRED], obj=quad[OBJ], why=why)
bindings = newBindings
if diag.chatty_flag>70: progress("Substitions %s generated %s" %(bindings, newBindings))
return
## def unify(self, other, vars=Set([]), existentials=Set([]), bindings={}):
def unifySecondary(self, other, env1, env2, vars,
universals, existentials,
n1Source, n2Source):
if self.canonical and other.canonical and self.store._equivalentFormulae.connected(self, other):
yield (env1, env2)
else:
from query import n3Equivalent, testIncludes
freeVars = self.freeVariables() ## We can't use these
retVal = n3Equivalent(self, other, env1, env2, vars,
universals, existentials,
n1Source, n2Source) # \
## and n3Entails(self, other, vars=vars, existentials=existentials, bindings=bindings)
for (env11, env12) in retVal:
if env11 == env1 and env12 == env2:
self.store._equivalentFormulae.merge(self, other)
yield (env11, env12)
## unify = memoize(unify)
def comparePair(self, other):
"Used only in outputString"
for i in 0,1:
x = self[i].compareAnyTerm(other[i])
if x != 0:
return x
###############################################################################################
#
# C W M - S P E C I A L B U I L T - I N s
#
###########################################################################
# Equivalence relations
class BI_EqualTo(LightBuiltIn,Function, ReverseFunction):
def eval(self, subj, obj, queue, bindings, proof, query):
return (subj is obj) # Assumes interning
def evalObj(self, subj, queue, bindings, proof, query):
return subj
def evalSubj(self, obj, queue, bindings, proof, query):
return obj
class BI_notEqualTo(LightBuiltIn):
def eval(self, subj, obj, queue, bindings, proof, query):
return (subj is not obj) # Assumes interning
BI_SameAs = BI_EqualTo
#### I hope this is never really added
##class BI_RunAsPython(LightBuiltIn, Function):
## def evaluateObject(self, subject):
## return eval(subject)
# Functions
class BI_uri(LightBuiltIn, Function, ReverseFunction):
def evalObj(self, subj, queue, bindings, proof, query):
type, value = subj.asPair()
if type == SYMBOL:
return self.store.intern((LITERAL, value))
def evaluateSubject(self, object):
"""Return the object which has this string as its URI
#@@hm... check string for URI syntax?
# or at least for non-uri chars, such as space?
Note that relative URIs can be OK as the whole process
has a base, which may be irrelevant. Eg see roadmap-test in retest.sh
"""
store = self.store
if ':' not in object:
progress("Warning: taking log:uri of non-abs: %s" % object)
return None
#except (TypeError, AttributeError):
# return None
return store.intern((SYMBOL, object))
class BI_dtlit(LightBuiltIn, Function):
"""built a datatype literal from a string and a uri"""
def evaluateObject(self, subj_py):
lex, dt = subj_py
if dt is self.store.symbol("http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral"):
try:
dom = XMLtoDOM(lex)
except SyntaxError, e:
raise UnknownType # really malformed literal
return self.store.newXMLLiteral(dom)
else:
return self.store.newLiteral(lex, dt)
class BI_rawUri(BI_uri):
"""This is like uri except that it allows you to get the internal
identifiers for anonymous nodes and formuale etc."""
def evalObj(self, subj, queue, bindings, proof, query):
type, value = subj.asPair()
return self.store.intern((LITERAL, value))
class BI_rawType(LightBuiltIn, Function):
"""
The raw type is a type from the point of view of the langauge: is
it a formula, list, and so on. Needed for test for formula in finding subformulae
eg see test/includes/check.n3
"""
def evalObj(self, subj, queue, bindings, proof, query):
store = self.store
if isinstance(subj, Literal): y = store.Literal
elif isinstance(subj, Formula): y = store.Formula
elif isinstance(subj, List): y = store.List
elif isinstance(subj, N3Set): y = store.Set
elif isinstance(subj, AnonymousNode): y = store.Blank
else: y = store.Other # None? store.Other?
if diag.chatty_flag > 91:
progress("%s rawType %s." %(`subj`, y))
return y
class BI_racine(LightBuiltIn, Function): # The resource whose URI is the same up to the "#"
def evalObj(self, subj, queue, bindings, proof, query):
if isinstance(subj, Fragment):
return subj.resource
else:
return subj
# Heavy Built-ins
class BI_includes(HeavyBuiltIn):
"""Check that one formula does include the other.
This limits the ability to bind a variable by searching inside another
context. This is quite a limitation in some ways. @@ fix
"""
def eval(self, subj, obj, queue, bindings, proof, query):
store = subj.store
if isinstance(subj, Formula) and isinstance(obj, Formula):
return testIncludes(subj, obj, bindings=bindings) # No (relevant) variables
return 0
class BI_notIncludes(HeavyBuiltIn):
"""Check that one formula does not include the other.
notIncludes is a heavy function not only because it may take more time than
a simple search, but also because it must be performed after other work so that
the variables within the object formula have all been subsituted. It makes no sense
to ask a notIncludes question with variables, "Are there any ?x for which
F does not include foo bar ?x" because of course there will always be an
infinite number for any finite F. So notIncludes can only be used to check, when a
specific case has been found, that it does not exist in the formula.
This means we have to know that the variables do not occur in obj.
As for the subject, it does make sense for the opposite reason. If F(x)
includes G for all x, then G would have to be infinite.
"""
def eval(self, subj, obj, queue, bindings, proof, query):
store = subj.store
if isinstance(subj, Formula) and isinstance(obj, Formula):
return not testIncludes(subj, obj, bindings=bindings, interpretBuiltins=0) # No (relevant) variables
return 0 # Can't say it *doesn't* include it if it ain't a formula
class BI_notIncludesWithBuiltins(HeavyBuiltIn):
def eval(self, subj, obj, queue, bindings, proof, query):
store = subj.store
if isinstance(subj, Formula) and isinstance(obj, Formula):
return not testIncludes(subj, obj, bindings=bindings,
interpretBuiltins=1) # No (relevant) variables
return 0 # Can't say it *doesn't* include it if it ain't a formula
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 representation 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()
# if diag.tracking: flags="B" # @@@@@@@@@@@ Yuk
# else: flags=""
F = self.store.load(inputURI, why=becauseSubexpression)
if diag.chatty_flag>10: progress(" semantics: %s" % (F))
return F.canonicalize()
class BI_semanticsWithImportsClosure(HeavyBuiltIn, Function):
""" The semantics of a resource are its machine-readable meaning,
as an N3 forumula. The URI is used to find a representation of
the resource in bits which is then parsed according to its content
type. Extension : It also loads all imported URIs"""
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.semanticsWithImportsClosure, 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 with closure " + doc.uriref())
inputURI = doc.uriref()
F = store.newFormula()
F.setClosureMode("i")
F = store.load(uri=inputURI, openFormula=F)
if diag.chatty_flag>10: progress("Reading and parsing with closure done. semantics: %s" % (F))
# if diag.tracking:
# proof.append(F.collector)
F = F.close()
store.storeQuad((store._experience, store.semanticsWithImportsClosure, doc, F))
return F
import httplib
class BI_semanticsOrError(BI_semantics):
""" Either get and parse to semantics or return an error message on any error """
def evalObj(self, subj, queue, bindings, proof, query):
import xml.sax._exceptions # hmm...
store = subj.store
x = store.any((store._experience, store.semanticsOrError, subj, None))
if x != None:
if diag.chatty_flag > 10: progress(`store._experience`+`store.semanticsOrError`+": Already found error for "+`subj`+" was: "+ `x`)
return x
try:
return BI_semantics.evalObj(self, subj, queue, bindings, proof, query)
except (IOError, SyntaxError, DocumentAccessError,
xml.sax._exceptions.SAXParseException, httplib.BadStatusLine):
message = sys.exc_info()[1].__str__()
result = store.intern((LITERAL, message))
if diag.chatty_flag > 0: progress(`store.semanticsOrError`+": Error trying to access <" + `subj` + ">: "+ message)
store.storeQuad((store._experience,
store.semanticsOrError,
subj,
result))
return result
def loadToStore(term, types):
"""load content from the web and keep it in the store's experience.
return resulting literal term
raises IOError
<DanC> the log:content built-in could keep an HTTP response
object around a la tabulator too.
<timbl> yes.
<timbl> You learn a lot from a recode.
"""
if isinstance(term, Fragment): doc = term.resource # i.e. racine
else: doc = term
store = term.store #hmm... separate store from term?
C = store.any((store._experience, store.content, doc, None))
if C != None:
if diag.chatty_flag > 10: progress("already read " + `doc`)
return C
if diag.chatty_flag > 10: progress("Reading " + `doc`)
inputURI = doc.uriref()
netStream = webget(inputURI, types)
#@@ get charset from headers
str = netStream.read().decode('utf-8')
C = store.intern((LITERAL, str))
store.storeQuad((store._experience,
store.content,
doc,
C))
return C
class BI_content(HeavyBuiltIn, Function):
def evalObj(self, subj, queue, bindings, proof, query):
try:
return loadToStore(subj, [])
except IOError:
return None # hmm... is built-in API evolving to support exceptions?
class BI_xmlTree(HeavyBuiltIn, Function):
def evalObj(self, subj, queue, bindings, proof, query):
x= BI_content.evalObj(self, subj, queue, bindings, proof, query)
dom = XMLtoDOM(x.value())
return subj.store.intern((XMLLITERAL, dom))
class BI_parsedAsN3(HeavyBuiltIn, Function):
def evalObj(self, subj, queue, bindings, proof, query):
store = subj.store
if isinstance(subj, Literal):
F = store.any((store._experience, store.parsedAsN3, subj, None))
if F != None: return F
if diag.chatty_flag > 10: progress("parsing " + subj.string[:30] + "...")
inputURI = subj.asHashURI() # iffy/bogus... rather asDataURI? yes! but make more efficient
p = notation3.SinkParser(store)
p.startDoc()
p.feed(subj.string.encode('utf-8')) #@@ catch parse errors
F = p.endDoc()
F = F.close()
store._experience.add(subj=subj, pred=store.parsedAsN3, obj=F)
return F
class BI_conclusion(HeavyBuiltIn, Function):
""" Deductive Closure
Closure under Forward Inference, equivalent to cwm's --think function.
This is a function, so the object is calculated from the subject.
"""
def evalObj(self, subj, queue, bindings, proof, query):
store = subj.store
if isinstance(subj, Formula):
assert subj.canonical != None
F = self.store.any((store._experience, store.cufi, subj, None)) # Cached value?
if F != None:
if diag.chatty_flag > 10: progress("Bultin: " + `subj`+ " cached log:conclusion " + `F`)
return F
F = self.store.newFormula()
newTopLevelFormula(F)
if diag.tracking:
reason = Premise("Assumption of builtin", (subj, self))
# reason = BecauseMerge(F, subj)
# F.collector = reason
# proof.append(reason)
else: reason = None
if diag.chatty_flag > 10: progress("Bultin: " + `subj`+ " log:conclusion " + `F`)
self.store.copyFormula(subj, F, why=reason) # leave open
think(F)
F = F.close()
assert subj.canonical != None
self.store.storeQuad((store._experience, store.cufi, subj, F),
why=BecauseOfExperience("conclusion")) # Cache for later
return F
class BI_supports(HeavyBuiltIn):
"""A more managable version of log:conclusion
The real version of this should appear in query.py
"""
def eval(self, subj, obj, queue, bindings, proof, query):
pass
class BI_filter(LightBuiltIn, Function):
"""Filtering of formulae
"""
def evalObj(self, subj, queue, bindings, proof, query):
store = subj.store
if not isinstance(subj, List):
raise ValueError('I need a list of two formulae')
list = [x for x in subj]
if len(list) != 2:
raise ValueError('I need a list of TWO formulae')
if diag.chatty_flag > 30:
progress("=== begin filter of:" + `list`)
# list = [bindings.get(a,a) for a in list]
base, filter = list
F = self.store.newFormula()
if diag.tracking:
pass
else: reason = None
applyRules(base, filter, F)
F = F.close()
if diag.chatty_flag > 30:
progress("=== end filter of:" + `list` + "we got: " + `F`)
return F
class BI_vars(LightBuiltIn, Function):
"""Get only the variables from a formula
"""
def evalObj(self, subj, queue, bindings, proof, query):
F = self.store.newFormula()
#F.existentials().update(subj.existentials())
F.universals().update(subj.universals())
return F.close()
class BI_universalVariableName(RDFBuiltIn): #, MultipleFunction):
"""Is the object the name of a universal variable in the subject?
Runs even without interpretBuitins being set.
Used internally in query.py for testing for
Can be used as a test, or returns a sequence of values."""
def eval(self, subj, obj, queue, bindings, proof, query):
if not isinstance(subj, Formula): return None
s = str(obj)
if diag.chatty_flag > 180:
progress(`subj.universals()`)
return obj in subj.universals()
for v in subj.universals():
if v.uriref() == s: return 1
return 0
def evalObj(self,subj, queue, bindings, proof, query):
if not isinstance(subj, Formula): return None
return [subj.newLiteral(x.uriref()) for x in subj.universals()]
class BI_existentialVariableName(RDFBuiltIn): #, MultipleFunction):
"""Is the object the name of a existential variable in the subject?
Can be used as a test, or returns a sequence of values.
Currently gives BNode names too. Maybe we make sep function for that?"""
def eval(self, subj, obj, queue, bindings, proof, query):
if not isinstance(subj, Formula): return None
s = str(obj)
if obj not in subj.existentials() and diag.chatty_flag > 25:
progress('Failed, which is odd. Subj="%s", Obj="%s"' % (subj.debugString(), obj.debugString()))
return obj in subj.existentials()
for v in subj.existentials():
if v.uriref() == s: return 1
return 0
def evalObj(self,subj, queue, bindings, proof, query):
if not isinstance(subj, Formula): return None
rea = None
return [subj.newLiteral(x.uriref()) for x in subj.existentials()]
class BI_enforceUniqueBinding(RDFBuiltIn):
"""Is the mapping from the variable in the subject to the name in the object unique?
"""
def eval(self, subj, obj, queue, bindings, proof, query):
if not isinstance(subj, Formula): return None
s = str(obj)
if subj not in query.backwardMappings:
query.backwardMappings[subj] = s
return True
return query.backwardMappings[subj] == s
class BI_conjunction(LightBuiltIn, Function): # Light? well, I suppose so.
""" The conjunction of a set of formulae is the set of statements which is
just the union of the sets of statements
modulo non-duplication of course."""
def evalObj(self, subj, queue, bindings, proof, query):
subj_py = subj.value()
if diag.chatty_flag > 50:
progress("Conjunction input:"+`subj_py`)
for x in subj_py:
progress(" conjunction input formula %s has %i statements"
% (x, x.size()))
F = self.store.newFormula()
if diag.tracking:
reason = Because("I said so #4")
#reason = BecauseMerge(F, subj_py)
else: reason = None
for x in subj_py:
if not isinstance(x, Formula): return None # Can't
if (x.canonical == None): # Not closed! !!
F.canonical != None
progress("Conjunction input NOT CLOSED:"+`x`) #@@@
self.store.copyFormula(x, F, why=reason) # No, that is
if diag.chatty_flag > 74:
progress(" Formula %s now has %i" % (`F`,len(F.statements)))
return F.canonicalize()
class BI_n3String(LightBuiltIn, Function): # Light? well, I suppose so.
""" The n3 string for a formula is what you get when you
express it in the N3 language without using any URIs.
Note that there is no guarantee that two implementations will
generate the same thing, but whatever they generate should
parse back using parsedAsN3 to exaclty the same original formula.
If we *did* have a canonical form it would be great for signature
A canonical form is possisble but not simple."""
def evalObj(self, subj, queue, bindings, proof, query):
if diag.chatty_flag > 50:
progress("Generating N3 string for:"+`subj`)
if isinstance(subj, Formula):
return self.store.intern((LITERAL, subj.n3String()))
class BI_reification(HeavyBuiltIn, Function, ReverseFunction):
"""
"""
def evalSubj(self, obj, queue, bindings, proof, query):
f = obj.store.newFormula()
return reify.dereification(obj, f, obj.store)
def evalObj(self, subj, queue, bindings, proof, query):
f = subj.store.newFormula()
q = subj.reification(f, {}, why=None)
f=f.close()
self.store.storeQuad((self.store._experience, self.store.type, f, 3), why=BecauseOfExperience("SomethingOrOther"))
return q
import weakref
class Disjoint_set(object):
class disjoint_set_node(object):
def __init__(self, val):
self.value = weakref.ref(val)
self.parent = None
self.rank = 0
def link(self, other):
if other.parent or self.parent:
raise RuntimeError
if self.rank > other.rank:
other.parent = self
else:
self.parent = other
if self.rank == other.rank:
other.rank += 1
def find_set(self):
if self.parent is None:
return self
self.parent = self.parent.find_set()
return self.parent
def disjoint(self, other):
return self() is not other()
def connected(self, other):
return self() is other()
__call__ = find_set
def __init__(self):
self.map = weakref.WeakKeyDictionary()
def add(self, f):
self.map[f] = self.disjoint_set_node(f)
def connected(self, f, g):
return self.map[f].connected(self.map[g])
def merge(self, s1, s2):
s1 = self.map[s1]()
s2 = self.map[s2]()
s1.link(s2)
################################################################################################
class RDFStore(RDFSink) :
""" Absorbs RDF stream and saves in triple store
"""
def clear(self):
"Remove all formulas from the store @@@ DOESN'T ACTUALLY DO IT/BROKEN"
self.resources = WeakValueDictionary() # Hash table of URIs for interning things
# self.formulae = [] # List of all formulae
self._experience = None # A formula of all the things program run knows from direct experience
self._formulaeOfLength = {} # A dictionary of all the constant formuale in the store, lookup by length key.
self._formulaeOfLengthPerWorkingContext = {}
self.size = 0
self._equivalentFormulae = Disjoint_set()
def __init__(self, genPrefix=None, metaURI=None, argv=None, crypto=0):
RDFSink.__init__(self, genPrefix=genPrefix)
self.clear()
self.argv = argv # List of command line arguments for N3 scripts
run = uripath.join(uripath.base(), ".RUN/") + `time.time()` # Reserrved URI @@
if metaURI != None: meta = metaURI
else: meta = run + "meta#formula"
self.reset(meta)
# Constants, as interned:
self.forSome = self.symbol(forSomeSym)
self.integer = self.symbol(INTEGER_DATATYPE)
self.float = self.symbol(FLOAT_DATATYPE)
self.boolean = self.symbol(BOOL_DATATYPE)
self.decimal = self.symbol(DECIMAL_DATATYPE)
self.forAll = self.symbol(forAllSym)
self.implies = self.symbol(Logic_NS + "implies")
self.insertion = self.symbol(Delta_NS + "insertion")
self.deletion = self.symbol(Delta_NS + "deletion")
self.means = self.symbol(Logic_NS + "means")
self.asserts = self.symbol(Logic_NS + "asserts")
# Register Light Builtins:
log = self.symbol(Logic_NS[:-1]) # The resource without the hash
# Functions:
log.internFrag("racine", BI_racine) # Strip fragment identifier from string
log.internFrag("dtlit", BI_dtlit)
self.rawType = log.internFrag("rawType", BI_rawType) # syntactic type, oneOf:
log.internFrag("rawUri", BI_rawUri)
self.Literal = log.internFrag("Literal", Fragment) # syntactic type possible value - a class
self.List = log.internFrag("List", Fragment) # syntactic type possible value - a class
self.Set = log.internFrag("Set", Fragment) # syntactic type possible value - a class
self.Formula = log.internFrag("Formula", Fragment) # syntactic type possible value - a class
self.Blank = log.internFrag("Blank", Fragment)
self.Other = log.internFrag("Other", Fragment) # syntactic type possible value - a class
self.filter = log.internFrag("filter", BI_filter) # equivilent of --filter
self.vars = log.internFrag("vars", BI_vars) # variables of formula
self.universalVariableName = log.internFrag(
"universalVariableName", BI_universalVariableName)
self.existentialVariableName = log.internFrag(
"existentialVariableName", BI_existentialVariableName)
self.enforceUniqueBinding = log.internFrag(
"enforceUniqueBinding", BI_enforceUniqueBinding)
log.internFrag("conjunction", BI_conjunction)
# Bidirectional things:
log.internFrag("uri", BI_uri)
log.internFrag("equalTo", BI_EqualTo)
log.internFrag("notEqualTo", BI_notEqualTo)
log.internFrag("reification", BI_reification)
owl = self.symbol(OWL_NS[:-1])
self.sameAs = owl.internFrag("sameAs", BI_SameAs)
# Heavy relational operators:
self.includes = log.internFrag( "includes", BI_includes)
self.supports = log.internFrag( "supports", BI_supports)
# log.internFrag("directlyIncludes", BI_directlyIncludes)
self.notIncludes = log.internFrag("notIncludes", BI_notIncludes)
self.smartNotIncludes = log.internFrag("notIncludesWithBuiltins", BI_notIncludesWithBuiltins)
# log.internFrag("notDirectlyIncludes", BI_notDirectlyIncludes)
#Heavy functions:
# log.internFrag("resolvesTo", BI_semantics) # obsolete
self.semantics = log.internFrag("semantics", BI_semantics)
self.cufi = log.internFrag("conclusion", BI_conclusion)
self.semanticsOrError = log.internFrag("semanticsOrError", BI_semanticsOrError)
self.semanticsWithImportsClosure = log.internFrag("semanticsWithImportsClosure", BI_semanticsWithImportsClosure)
self.content = log.internFrag("content", BI_content)
self.parsedAsN3 = log.internFrag("parsedAsN3", BI_parsedAsN3)
self.n3ExprFor = log.internFrag("n3ExprFor", BI_parsedAsN3) ## Obsolete
log.internFrag("n3String", BI_n3String)
# Remote service flag in metadata:
self.definitiveService = log.internFrag("definitiveService", Fragment)
self.definitiveDocument = log.internFrag("definitiveDocument", Fragment)
self.pointsAt = log.internFrag("pointsAt", Fragment) # This was EricP's
# Constants:
self.Truth = self.symbol(Logic_NS + "Truth")
self.Falsehood = self.symbol(Logic_NS + "Falsehood")
self.type = self.symbol(RDF_type_URI)
self.Chaff = self.symbol(Logic_NS + "Chaff")
self.docRules = self.symbol("http://www.w3.org/2000/10/swap/pim/doc#rules")
self.imports = self.symbol("http://www.w3.org/2002/07/owl#imports")
self.owlOneOf = self.symbol('http://www.w3.org/2002/07/owl#oneOf')
# List stuff - beware of namespace changes! :-(
from cwm_list import BI_first, BI_rest
rdf = self.symbol(List_NS[:-1])
self.first = rdf.internFrag("first", BI_first)
self.rest = rdf.internFrag("rest", BI_rest)
self.nil = self.intern(N3_nil, FragmentNil)
self.Empty = self.intern(N3_Empty)
self.li = self.intern(N3_li)
self.List = self.intern(N3_List)
import cwm_string # String builtins
import cwm_os # OS builtins
import cwm_time # time and date builtins
import cwm_math # Mathematics
import cwm_trigo # Trignometry
import cwm_times # time and date builtins
import cwm_maths # Mathematics, perl/string style
import cwm_list # List handling operations
import cwm_set # Set operations
import cwm_sparql # builtins for sparql
import cwm_xml # XML Document Object Model operations
cwm_string.register(self)
cwm_math.register(self)
cwm_trigo.register(self)
cwm_maths.register(self)
cwm_os.register(self)
cwm_time.register(self)
cwm_times.register(self)
cwm_list.register(self)
cwm_set.register(self)
cwm_sparql.register(self)
cwm_xml.register(self)
import cwm_crypto # Cryptography
if crypto:
if cwm_crypto.USE_PKC == 0:
raise RuntimeError("Try installing pycrypto, and make sure it is in you PYTHONPATH")
else:
cwm_crypto.USE_PKC = 0
cwm_crypto.register(self) # would like to anyway to catch bug if used but not available
def newLiteral(self, str, dt=None, lang=None):
"Interned version: generate new literal object as stored in this store"
key = (str, dt, lang)
result = self.resources.get(key, None)
if result != None: return result
# if dt is not None: dt = self.newSymbol(dt)
assert dt is None or isinstance(dt, LabelledNode)
if dt is not None and not isinstance(dt, Fragment):
progress("Warning: <%s> is not a fragment!" % dt)
result = Literal(self, str, dt, lang)
self.resources[key] = result
return result
def newXMLLiteral(self, dom):
# We do NOT intern these so they will NOT have 'is' same as '=='
return XMLLiteral(self, dom)
def newFormula(self, uri=None):
return IndexedFormula(self, uri)
def newSymbol(self, uri):
return self.intern(RDFSink.newSymbol(self, uri))
def newSet(self, iterator=[], context=None):
new_set = N3Set(iterator)
Term.__init__(new_set, self)
return new_set
def newBlankNode(self, context, uri=None, why=None):
"""Create or reuse, in the default store, a new unnamed node within the given
formula as context, and return it for future use"""
return context.newBlankNode(uri=uri)
def newExistential(self, context, uri=None, why=None):
"""Create or reuse, in the default store, a new named variable
existentially qualified within the given
formula as context, and return it for future use"""
return self.intern(RDFSink.newExistential(self, context, uri, why=why))
def newUniversal(self, context, uri=None, why=None):
"""Create or reuse, in the default store, a named variable
universally qualified within the given
formula as context, and return it for future use"""
return self.intern(RDFSink.newUniversal(self, context, uri, why=why))
###################
def reset(self, metaURI): # Set the metaURI
self._experience = self.newFormula(metaURI + "_formula")
assert isinstance(self._experience, Formula)
def load(store, uri=None, openFormula=None, asIfFrom=None, contentType=None, remember=1,
flags="", referer=None, why=None, topLevel=False):
"""Get and parse document. Guesses format if necessary.
uri: if None, load from standard input.
remember: if 1, store as metadata the relationship between this URI and this formula.
Returns: top-level formula of the parsed document.
Raises: IOError, SyntaxError, DocumentError
This was and could be an independent function, as it is fairly independent
of the store. However, it is natural to call it as a method on the store.
And a proliferation of APIs confuses.
"""
baseURI = uripath.base()
givenOpenFormula = openFormula
if openFormula is None:
openFormula = store.newFormula()
if topLevel:
newTopLevelFormula(openFormula)
if uri != None and openFormula==None and remember:
addr = uripath.join(baseURI, uri) # Make abs from relative
source = store.newSymbol(addr)
F = store._experience.the(source, store.semantics)
if F != None:
if diag.chatty_flag > 40: progress("Using cached semantics for",addr)
return F
F = webAccess.load(store, uri, openFormula, asIfFrom, contentType, flags, referer, why)
store._experience.add(
store.intern((SYMBOL, addr)), store.semantics, F,
why=BecauseOfExperience("load document"))
return F
return webAccess.load(store, uri, openFormula, asIfFrom, contentType, flags, \
referer=referer, why=why)
def loadMany(self, uris, openFormula=None, referer=None):
"""Get, parse and merge serveral documents, given a list of URIs.
Guesses format if necessary.
Returns top-level formula which is the parse result.
Raises IOError, SyntaxError
"""
assert type(uris) is type([])
if openFormula is None: F = self.newFormula()
else: F = openFormula
f = F.uriref()
for u in uris:
F.reopen() # should not be necessary
self.load(u, openFormula=F, remember=0, referer=referer)
return F.close()
def genId(self):
"""Generate a new identifier
This uses the inherited class, but also checks that we haven't for some pathalogical reason
ended up generating the same one as for example in another run of the same system.
"""
while 1:
uriRefString = RDFSink.genId(self)
hash = string.rfind(uriRefString, "#")
if hash < 0 : # This is a resource with no fragment
return uriRefString # ?!
resid = uriRefString[:hash]
r = self.resources.get(resid, None)
if r is None: return uriRefString
fragid = uriRefString[hash+1:]
f = r.fragments.get(fragid, None)
if f is None: return uriRefString
if diag.chatty_flag > 70:
progress("llyn.genid Rejecting Id already used: "+uriRefString)
def checkNewId(self, urirefString):
"""Raise an exception if the id is not in fact new.
This is useful because it is usfeul
to generate IDs with useful diagnostic ways but this lays them
open to possibly clashing in pathalogical cases."""
hash = string.rfind(urirefString, "#")
if hash < 0 : # This is a resource with no fragment
result = self.resources.get(urirefString, None)
if result is None: return
else:
r = self.resources.get(urirefString[:hash], None)
if r is None: return
f = r.fragments.get(urirefString[hash+1:], None)
if f is None: return
raise ValueError("Ooops! Attempt to create new identifier hits on one already used: %s"%(urirefString))
return
def internURI(self, str, why=None):
warn("use symbol()", DeprecationWarning, stacklevel=3)
return self.intern((SYMBOL,str), why)
def symbol(self, str, why=None):
"""Intern a URI for a symvol, returning a symbol object"""
return self.intern((SYMBOL,str), why)
def _fromPython(self, x, queue=None):
"""Takem a python string, seq etc and represent as a llyn object"""
if isinstance(x, tuple(types.StringTypes)):
return self.newLiteral(x)
elif type(x) is types.LongType or type(x) is types.IntType:
return self.newLiteral(str(x), self.integer)
elif isinstance(x, Decimal):
return self.newLiteral(str(x), self.decimal)
elif isinstance(x, bool):
return self.newLiteral(x and 'true' or 'false', self.boolean)
elif isinstance(x, xml.dom.minidom.Document):
return self.newXMLLiteral(x)
elif type(x) is types.FloatType:
if `x`.lower() == "nan": # We can get these form eg 2.math:asin
return None
return self.newLiteral(`x`, self.float)
elif isinstance(x, Set) or isinstance(x, ImmutableSet):
return self.newSet([self._fromPython(y) for y in x])
elif isinstance(x, Term):
return x
elif hasattr(x,'__getitem__'): #type(x) == type([]):
return self.nil.newList([self._fromPython(y) for y in x])
return x
def intern(self, what, dt=None, lang=None, why=None, ):
"""find-or-create a Fragment or a Symbol or Literal or list as appropriate
returns URISyntaxError if, for example, the URIref has
two #'s.
This is the way they are actually made.
"""
if isinstance(what, Term): return what # Already interned. @@Could mask bugs
if type(what) is not types.TupleType:
if isinstance(what, tuple(types.StringTypes)):
return self.newLiteral(what, dt, lang)
# progress("llyn1450 @@@ interning non-string", `what`)
if type(what) is types.LongType:
return self.newLiteral(str(what), self.integer)
if type(what) is types.IntType:
return self.newLiteral(`what`, self.integer)
if type(what) is types.FloatType:
return self.newLiteral(repr(what), self.float)
if isinstance(what,Decimal):
return self.newLiteral(str(what), self.decimal)
if isinstance(what, bool):
return self.newLiteral(what and 'true' or 'false', self.boolean)
if type(what) is types.ListType: #types.SequenceType:
return self.newList(what)
raise RuntimeError("Eh? can't intern "+`what`+" of type: "+`what.__class__`)
typ, urirefString = what
if typ == LITERAL:
return self.newLiteral(urirefString, dt, lang)
if typ == LITERAL_DT:
return self.newLiteral(urirefString[0], self.intern(SYMBOL, urirefString[1]))
if typ == LITERAL_LANG:
return self.newLiteral(urirefString[0], None, urirefString[1])
else:
urirefString = canonical(urirefString)
assert ':' in urirefString, "must be absolute: %s" % urirefString
hash = string.rfind(urirefString, "#")
if hash < 0 : # This is a resource with no fragment
assert typ == SYMBOL, "If URI <%s>has no hash, must be symbol" % urirefString
result = self.resources.get(urirefString, None)
if result != None: return result
result = Symbol(urirefString, self)
self.resources[urirefString] = result
else : # This has a fragment and a resource
resid = urirefString[:hash]
if string.find(resid, "#") >= 0:
raise URISyntaxError("Hash in document ID - can be from parsing XML as N3! -"+resid)
r = self.symbol(resid)
if typ == SYMBOL:
if urirefString == N3_nil[1]: # Hack - easier if we have a different classs
result = r.internFrag(urirefString[hash+1:], FragmentNil)
else:
result = r.internFrag(urirefString[hash+1:], Fragment)
elif typ == ANONYMOUS:
result = r.internFrag(urirefString[hash+1:], AnonymousNode)
elif typ == FORMULA:
raise RuntimeError("obsolete")
result = r.internFrag(urirefString[hash+1:], IndexedFormula)
else: raise RuntimeError, "did not expect other type:"+`typ`
return result
def newList(self, value, context=None):
return self.nil.newList(value)
# def deleteFormula(self,F):
# if diag.chatty_flag > 30: progress("Deleting formula %s %ic" %
# ( `F`, len(F.statements)))
# for s in F.statements[:]: # Take copy
# self.removeStatement(s)
def reopen(self, F):
if F.canonical is None:
if diag.chatty_flag > 50:
progress("reopen formula -- @@ already open: "+`F`)
return F # was open
if diag.chatty_flag > 00:
progress("warning - reopen formula:"+`F`)
key = len(F.statements), len(F.universals()), len(F.existentials())
try:
self._formulaeOfLength[key].remove(F) # Formulae of same length
except (KeyError, ValueError):
pass
F.canonical = None
return F
def bind(self, prefix, uri):
if prefix != "": # Ignore binding to empty prefix
return RDFSink.bind(self, prefix, uri) # Otherwise, do as usual.
def makeStatement(self, tuple, why=None):
"""Add a quad to the store, each part of the quad being in pair form."""
q = ( self.intern(tuple[CONTEXT]),
self.intern(tuple[PRED]),
self.intern(tuple[SUBJ]),
self.intern(tuple[OBJ]) )
if q[PRED] is self.forSome and isinstance(q[OBJ], Formula):
if diag.chatty_flag > 97: progress("Makestatement suppressed")
return # This is implicit, and the same formula can be used un >1 place
self.storeQuad(q, why)
def makeComment(self, str):
pass # Can't store comments
def any(self, q):
"""Query the store for the first match.
Quad contains one None as wildcard. Returns first value
matching in that position.
"""
list = q[CONTEXT].statementsMatching(q[PRED], q[SUBJ], q[OBJ])
if list == []: return None
for p in ALL4:
if q[p] is None:
return list[0].quad[p]
def storeQuad(self, q, why=None):
""" intern quads, in that dupliates are eliminated.
subject, predicate and object are terms - or atomic values to be interned.
Builds the indexes and does stuff for lists.
Deprocated: use Formula.add()
"""
context, pred, subj, obj = q
assert isinstance(context, Formula), "Should be a Formula: "+`context`
return context.add(subj=subj, pred=pred, obj=obj, why=why)
def startDoc(self):
pass
def endDoc(self, rootFormulaPair):
return
##########################################################################
#
# Output methods:
#
def dumpChronological(self, context, sink):
"Fast as possible. Only dumps data. No formulae or universals."
pp = Serializer(context, sink)
pp. dumpChronological()
del(pp)
def dumpBySubject(self, context, sink, sorting=1):
""" Dump by order of subject except forSome's first for n3=a mode"""
pp = Serializer(context, sink, sorting=sorting)
pp. dumpBySubject()
del(pp)
def dumpNested(self, context, sink, flags=""):
""" Iterates over all URIs ever seen looking for statements
"""
pp = Serializer(context, sink, flags=flags)
pp. dumpNested()
del(pp)
################################## Manipulation methods:
#
# Note when we move things, then the store may shrink as they may
# move on top of existing entries and we don't allow duplicates.
#
# @@@@ Should automatically here rewrite any variable name clashes
# for variable names which occur in the other but not as the saem sort of variable
# Must be done by caller.
def copyFormula(self, old, new, why=None):
new.loadFormulaWithSubstitution(old, why=why)
return
## bindings = {old: new}
## for v in old.universals():
## new.declareUniversal(bindings.get(v,v))
## for v in old.existentials():
## new.declareExistential(bindings.get(v,v))
## for s in old.statements[:] : # Copy list!
## q = s.quad
## for p in CONTEXT, PRED, SUBJ, OBJ:
## x = q[p]
## if x is old:
## q = q[:p] + (new,) + q[p+1:]
## self.storeQuad(q, why)
def purge(self, context, boringClass=None):
"""Clean up intermediate results
Statements in the given context that a term is a Chaff cause
any mentions of that term to be removed from the context.
"""
if boringClass is None:
boringClass = self.Chaff
for subj in context.subjects(pred=self.type, obj=boringClass):
self.purgeSymbol(context, subj)
def purgeSymbol(self, context, subj):
"""Purge all triples in which a symbol occurs.
"""
total = 0
for t in context.statementsMatching(subj=subj)[:]:
context.removeStatement(t) # SLOW
total = total + 1
for t in context.statementsMatching(pred=subj)[:]:
context.removeStatement(t) # SLOW
total = total + 1
for t in context.statementsMatching(obj=subj)[:]:
context.removeStatement(t) # SLOW
total = total + 1
if diag.chatty_flag > 30:
progress("Purged %i statements with %s" % (total,`subj`))
return total
# def removeStatement(self, s):
# "Remove statement from store"
# return s[CONTEXT].removeStatement(s)
def purgeExceptData(self, context):
"""Remove anything which can't be expressed in plain RDF"""
uu = context.universals()
for s in context.statements[:]:
for p in PRED, SUBJ, OBJ:
x = s[p]
if x in uu or isinstance(x, Formula):
context.removeStatement(s)
break
context._universalVariables.clear() # Cheat! @ use API
class URISyntaxError(ValueError):
"""A parameter is passed to a routine that requires a URI reference"""
pass
def isString(x):
# in 2.2, evidently we can test for isinstance(types.StringTypes)
# --- but on some releases, we need to say tuple(types.StringTypes)
return type(x) is type('') or type(x) is type(u'')
##################### Register this module
from myStore import setStoreClass
setStoreClass(RDFStore)
#ends
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