Parse from String

[Lars-H]

Hello,

I am interested in using your library for fast parsing from turtle to n-triples. However, as the current API only supports parsing from a file, I was wondering if it would be possible to extend the library to also parse string objects?

Thanks Lars

[ozekik]

Thank you for the comment!

I think it's possible and the library definitely should support that feature. I'll release the next version with it soon, while using tempfile or the like is needed for the moment.

[Lars-H]

Thanks, that sounds good!

[ozekik]

Now in v0.2.0 the library supports parsing file-like objects, so we can parse RDF from string as follows:

import io
import lightrdf

data = """<http://one.example/subject1> <http://one.example/predicate1> <http://one.example/object1> . # comments here
# or on a line by themselves
_:subject1 <http://an.example/predicate1> "object1" .
_:subject2 <http://an.example/predicate2> "object2" ."""

doc = lightrdf.RDFDocument(io.BytesIO(data.encode()), parser=lightrdf.turtle.PatternParser)

for triple in doc.search_triples("http://one.example/subject1", None, None):
    print(triple)

https://github.com/ozekik/lightrdf#tip-parse-from-string

Note that it requires byte stream (BytesIO) rather than text stream (StringIO). I think this is an internally consistent behavior and we can easily convert them each other (with more or less overhead though).