N3 parse error on single quote within single quotes · Issue #732 · RDFLib/rdflib (original) (raw)

Escaping an interior single quote within a single quoted string:

from rdflib import Graph

rdf = """PREFIX ex: http://a.example ex:test ex:pattern ' \'' . """ Graph().parse(data=rdf, format="turtle")

produces the following error:

  File "/Users/mrf7578/Development/venv/parsers/lib/python3.6/site-packages/rdflib/plugins/parsers/notation3.py", line 1591, in strconst
    "bad escape")
  File "/Users/mrf7578/Development/venv/parsers/lib/python3.6/site-packages/rdflib/plugins/parsers/notation3.py", line 1615, in BadSyntax
    raise BadSyntax(self._thisDoc, self.lines, argstr, i, msg)
rdflib.plugins.parsers.notation3.BadSyntax: at line 2 of <>:
Bad syntax (bad escape) at ^ in:
"b"PREFIX ex: <http://a.example>\nex:test ex:pattern ' "^b"\\'' .\n""

Changing lines 1578 and 1580 in notation3.py (rdflib 4.2.2) and adding a "\'" on the end of the pattern strings - current:

1588 k = 'abfrtvn\"'.find(ch) 1589 if k >= 0: 1590 uch = '\a\b\f\r\t\v\n\"'[k]

new:

            k = 'abfrtvn\\"\''.find(ch)
            if k >= 0:
                uch = '\a\b\f\r\t\v\n\\"\''[k]

Fixes this problem