Files

sparql.py - utility classes, exceptions, etc.
processor.py - glue code for RDFLib
parser.py - the pyparsing based parser, invoked as a module it will print the parse-tree of a query from commandline
parserutils.py - utilities for building up a parse-tree from pyparsing output
algebra.py - converting the parsetree to a SPARQL algebra expression
evaluate.py - evaluate a SPARQL algebra expression :)
evalutils.py - utility functions for evaluation, split off to avoid circular dependencies
operators.py - implementations of SPARQL built-in functions
aggregates.py - implementations of SPARQL aggregate functions
rdflib_sparql/results* has parsers/serializers for xml/rdf/json/csv/tsv result formats

Update test-cases

The DAWG test-cases are still changed. Download them again with:

Last time I did this a handful of files had MacOS9 line-endings (wat?) :

data-sparql11/entailment/plainLit.ttl / lang.ttl / simple.ttl

I fixed with:

perl -pi -e 's/\r/\n/g'

SPARQL Algebra evaluation can be overridden by a setuptools entry_point

The entry_point group is ''rdf.plugins.sparqleval''

A function must be provided which takes paramters ctx and part.

The function may raise NotImplementedError if it does not wish to handle a certain part.

See ''rdflib_sparql/evaluate.py'' for details (in particular evalPart)

Most interesting is probably overriding evalBGP.

See '''examples/customEval.py'''