/usr/lib/python2.7/dist-packages/swap/RDFSink.py is in python-swap 1.2.1-7.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 | """RDFSink -- RDF parser/serializer/store interface
This is a simple API for a push-stream of RDF data. It doesn't use
a particular classof obejcts, but just uses python pairs.
It is kinda crude but it does allow for example data to be squirted efficiently
between modules which use different python classes for RDF.
HISTORY
This module was factored out of notation3.py
REFERENCES
Python Style Guide
Author: Guido van Rossum
http://www.python.org/doc/essays/styleguide.html
"""
__version__ = "$Id: RDFSink.py,v 1.36 2007/06/26 02:36:15 syosi Exp $"
import uripath
import time
from warnings import warn
from diag import progress
# The statement is stored as a quad - affectionately known as a triple ;-)
# offsets when a statement is stored as a Python tuple (c, p, s, o)
CONTEXT = 0
PRED = 1
SUBJ = 2
OBJ = 3
PARTS = PRED, SUBJ, OBJ
ALL4 = CONTEXT, PRED, SUBJ, OBJ
# A sink takes quads where each item is a pair type, value
# However, the recopmmended way is for the source to call the factory methods new* rather
# than just make up pairs.
SYMBOL = 0 # URI which or may not have a fragment.
# (formerly: RESOURCE)
FORMULA = 1 # A { } set of statements. (identifier is arbitrary)
LITERAL = 2 # string, untyped RDF literal. x[1] is a string or unicode string
LITERAL_DT = 21 # typed RDF literal x[1] is a pair (string, datatype URI)
LITERAL_LANG = 22 # Language RDF literal x[1] is a pair (string, langauge)
ANONYMOUS = 3 # As SYMBOL except actual symbol is arbitrary, can be regenerated
XMLLITERAL = 25 # A DOM tree encases in a dummy document level
# quanitifiers... @@it's misleading to treat these as predicates...
Logic_NS = "http://www.w3.org/2000/10/swap/log#"
# For some graphs you can express with NTriples, there is no RDF syntax. The
# following allows an anonymous node to be merged with another node.
# It really is the same node, at the ntriples level, do not confuse with daml:sameAs
NODE_MERGE_URI = Logic_NS + "is" # Pseudo-property indicating node merging
forSomeSym = Logic_NS + "forSome"
forAllSym = Logic_NS + "forAll"
RDF_type_URI = "http://www.w3.org/1999/02/22-rdf-syntax-ns#type"
RDF_NS_URI = "http://www.w3.org/1999/02/22-rdf-syntax-ns#"
# DAML_NS=DPO_NS = "http://www.daml.org/2001/03/daml+oil#" # DAML plus oil
OWL_NS = "http://www.w3.org/2002/07/owl#"
DAML_sameAs_URI = OWL_NS+"sameAs"
parsesTo_URI = Logic_NS + "parsesTo"
RDF_spec = "http://www.w3.org/TR/REC-rdf-syntax/"
#List_NS = DPO_NS # We have to pick just one all the time
List_NS = RDF_NS_URI # From 20030808
_Old_Logic_NS = "http://www.w3.org/2000/10/swap/log.n3#"
# For lists:
N3_first = (SYMBOL, List_NS + "first")
N3_rest = (SYMBOL, List_NS + "rest")
N3_li = (SYMBOL, List_NS + "li")
N3_nil = (SYMBOL, List_NS + "nil")
N3_List = (SYMBOL, List_NS + "List")
N3_Empty = (SYMBOL, List_NS + "Empty")
# Standard python modules:
from os import getpid
from time import time
from uripath import base, join
# SWAP modules:
from diag import verbosity, progress
from os import environ
runNamespaceValue = None
def runNamespace():
"Return a URI suitable as a namespace for run-local objects"
# @@@ include hostname (privacy?) (hash it?)
global runNamespaceValue
if runNamespaceValue == None:
try:
runNamespaceValue = environ["CWM_RUN_NS"]
except KeyError:
runNamespaceValue = uripath.join(
uripath.base(), ".run-" + `time()` + "p"+ `getpid()` +"#")
runNamespaceValue = join(base(), runNamespaceValue) # absolutize
return runNamespaceValue
nextu = 0
def uniqueURI():
"A unique URI"
global nextu
nextu += 1
return runNamespace() + "u_" + `nextu`
class URISyntaxError(ValueError):
"""A parameter is passed to a routine that requires a URI reference"""
pass
class RDFSink:
"""interface to connect modules in RDF processing.
OBSOLETE
This is a superclass for other RDF processors which accept RDF events
or indeed Swell events. It is superceded, effectively, by the class Formula,
as a sink of data and a soiurce of new symbols.
Keeps track of prefixes.
This interface has the advantage that it does n ot have any dependencies
on object types, it is really one-way (easily serialized as no return values).
It has the disadvantages that
- It uses the pseudoproperties log:forSome and log:forAll to
make variables, which is a bit of a kludge.
- It may involve on the receiver side the same thing being interned
many times, which wastes time searching hash tables.
The superclass handles common functions such as craeting new arbitray
identifiers
"""
def __init__(self, genPrefix=None):
"""If you give it a URI prefix to use for generated IDs it
will use one; otherwise, it will use the name of an imaginary temporary file
in the current directory."""
self.prefixes = { } # Convention only - human friendly to
# track these.
self.namespaces = {} # reverse mapping of prefixes
self.defaultNamespace = None
self.usingRunNamespace = 0
self.declaredRunNamespace = 0
self._counts = {} # How many times each namespace is used
self._genPrefix = genPrefix
if genPrefix == None:
self._genPrefix = runNamespace() + "_g"
self.usingRunNamespace = 1
self._nextId = 0
self.stayOpen = 0 # Delay close because more data coming if >0
def startDoc(self):
pass
def endDoc(self, rootFormulaPair):
"""End a document
Call this once only at the end of parsing so that the receiver can wrap
things up, oprimize, intern, index and so on. The pair given is the (type, value)
identifier of the root formula of the thing parsed."""
pass
def reopen(self):
"""Un-End a document
If you have added stuff to a document, thought you were done, and
then want to add more, call this to get back into the sate that makeSatement
is again acceptable. Remember to end the document again when done."""
pass
def makeStatement(self, tuple, why=None):
"""add a statement to a stream/store.
raises URISyntaxError on bad URIs
tuple is a quad (context, predicate, subject, object) of things generated by calls to newLiteral etc
why is reason for the statement.
"""
pass
def intern(self, something):
return something
def newList(self, l, context):
if l == []:
return self.newSymbol('http://www.w3.org/1999/02/22-rdf-syntax-ns#nil')
a = self.newBlankNode(context)
first = self.newSymbol('http://www.w3.org/1999/02/22-rdf-syntax-ns#first')
rest = self.newSymbol('http://www.w3.org/1999/02/22-rdf-syntax-ns#rest')
self.makeStatement((context, first, a, l[0]))
self.makeStatement((context, rest, a, self.newList(l[1:], context)))
return a
def countNamespace(self, namesp):
"On output, count how many times each namespace is used"
try:
self._counts[namesp] += 1
except KeyError:
self._counts[namesp] = 1
def namespaceCounts(self):
return self._counts
def bind(self, prefix, uri):
"""Pass on a binding hint for later use in output
This really is just a hint. The parser calls bind to pass on
the prefix which it came across, as this is a useful hint for
a human readable prefix for output of the same
namespace. Otherwise, output processors will have to invent or
avoid useing namespaces, which will look ugly
"""
if ':' not in uri:
# @@ should raise an exception, but sax callbacks crash.
warn("@@URI must be absolute: %s" % uri)
# If we don't have a prefix for this ns...
if self.prefixes.get(uri, None) == None:
if self.namespaces.get(prefix,None) == None: # For conventions
self.prefixes[uri] = prefix
self.namespaces[prefix] = uri
if verbosity() > 29:
progress("RDFSink.bind: prefix %s: to <%s>. "%(prefix, uri))
else:
self.bind(prefix+"_", uri) # Recursion unnecessary
def setDefaultNamespace(self, uri):
"""Pass on a binding hint for later use in output
This really is just a hint. The parser calls this to pass on
the default namespace which it came across, as this is a
useful hint for a human readable prefix for output of the same
namespace. Otherwise, output processors will have to invent or
avoid useing namespaces, which will look ugly.
"""
self.defaultNamespace = uri
def makeComment(self, str):
"""This passes on a comment line which of course has no semantics.
This is only useful in direct piping of parsers to output, to preserve
comments in the original file.
"""
pass
def genId(self):
subj = None
while not subj:
subj = self._genPrefix
assert subj # don't mask bugs
subj = subj + `self._nextId`
self._nextId = self._nextId + 1
try:
self.checkNewId(subj) # For a store, just in case, check really unique
except ValueError:
subj = None
if self.usingRunNamespace and not self.declaredRunNamespace:
self.declaredRunNamespace = 1
ns = self._genPrefix
hash = ns.find("#")
self.bind("run", ns[:hash+1])
return subj
def setGenPrefix(self, genPrefix):
if not self._genPrefix:
self._genPrefix = genPrefix
def newLiteral(self, str, dt=None, lang=None):
if dt != None:
return (LITERAL_DT, (str, dt))
# raise ValueError("This sink cannot accept datatyped values")
if lang != None:
return (LITERAL_LANG, (str, lang))
# raise ValueError("This sink cannot accept values with languages")
return (LITERAL, str)
def newXMLLiteral(self, doc):
return (XMLLITERAL, doc)
def newSymbol(self, uri):
return (SYMBOL, uri)
def newFormula(self, uri=None):
if uri==None: return FORMULA, self.genId()
else: return (FORMULA, uri)
def newBlankNode(self, context, uri=None, why=None):
return self.newExistential(context, uri, why=why)
def checkNewId(self, uri):
"""The store can override this to 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."""
return
def newUniversal(self, context, uri=None, why=None):
if uri==None:
subj = ANONYMOUS, self.genId() # ANONYMOUS means "arbitrary symbol"
else: subj=(SYMBOL, uri)
self.makeStatement((context,
(SYMBOL, forAllSym), #pred
context, #subj
subj), why=why) # obj
return subj
def newExistential(self, context, uri=None, why=None):
if uri==None: subj = ANONYMOUS, self.genId()
else: subj=(SYMBOL, uri)
self.makeStatement((context,
(SYMBOL, forSomeSym), #pred
context, #subj
subj), why=why) # obj
return subj
class RDFStructuredOutput(RDFSink):
# The foillowing are only used for structured "pretty" output of structrued N3.
# They roughly correspond to certain syntax forms in N3, but the whole area
# is just a kludge for pretty output and not worth going into unless you need to.
# These simple versions may be inherited, by the reifier for example
def startAnonymous(self, triple, isList=0):
return self.makeStatement(triple)
def endAnonymous(self, subject, verb): # Remind me where we are
pass
def startAnonymousNode(self, subj):
pass
def endAnonymousNode(self, endAnonymousNode): # Remove default subject, restore to subj
pass
def startFormulaSubject(self, context):
pass
def endFormulaSubject(self, subj): # Remove context
pass
def startFormulaObject(self, triple):
return self.makeStatement(triple)
def endFormulaObject(self, pred, subj): # Remove context
pass
from diag import printState
class TracingRDFSink:
"""An implementation of the RDFSink interface which helps me
understand it, especially how it gets used by parsers vs. by an
RDF store. [ -sandro ]
Set .backing to be some other RDFSink if you want to get proper
results while tracing.
Try:
bash-2.04$ python cwm.py test/rules12.n3 --language=trace
bash-2.04$ python cwm.py --pipe test/rules12.n3 --language=trace
bash-2.04$ python cwm.py test/rules12.n3 --bySubject --language=trace
... and see the different outputs
"""
# These ones get called normally on a Sink...
def __init__(self, outURI, base=None, flags=None):
printState()
self.backing = None
def makeComment(self, comment):
printState()
if self.backing: self.backing.makeComment(comment)
def startDoc(self):
printState()
if self.backing: self.backing.startDoc()
def setDefaultNamespace(self, ns):
printState()
if self.backing: self.backing.setDefaultNamespace(ns)
def bind(self, prefix, uri):
printState()
if self.backing: self.backing.bind(prefix, uri)
def makeStatement(self, tuple, why=None):
printState()
if self.backing: self.backing.makeStatement(tuple, why)
def endDoc(self, rootFormulaPair="<<strangely omitted>>"):
printState()
if self.backing: self.backing.endDoc(rootFormulaPair)
# These ones get called when there's nesting, pretty-printed...
def startFormulaSubject(self, context):
printState()
if self.backing: self.backing.startFormulaSubject(context)
def endFormulaSubject(self, subj):
printState()
if self.backing: self.backing.endFormulaSubject(subj)
def startFormulaObject(self, triple):
printState()
if self.backing: self.backing.startFormulaObject(triple)
def endFormulaObject(self, pred, subj):
printState()
if self.backing: self.backing.endFormulaObject(pred, subj)
# These are called by "cwm --pipe", they *need* backing to work.
def newFormula(self, uri=None):
printState()
return self.backing.newFormula(uri)
def newSymbol(self, uri):
printState()
return self.backing.newSymbol(uri)
def newLiteral(self, str, dt=None, lang=None):
printState()
return self.backing.newSymbol(str, dt, lang)
# ends
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