Query with additional whitespace between 'NOT' and 'IN' or 'NOT' and 'EXISTS' fails with parse error

[abrokenjester]

Current Behavior

When parsing:

SELECT * WHERE { ?s ?p ?o. FILTER(?o NOT  IN (1, 2, 3)) }

or

SELECT * WHERE { ?s ?p ?o. FILTER NOT  EXISTS { ?s ?p ?o } }

parsing fails with a lexical error, caused by the additional whitespace between NOT and IN/EXISTS.

Expected Behavior

Parser should ignore additional whitespace between tokens, as per https://www.w3.org/TR/sparql11-query/#whitespace

Steps To Reproduce

No response

Version

4.0.1

Are you interested in contributing a solution yourself?

Yes

Anything else?

Split out from GH-3947

[abrokenjester]

Cause is that in our parser grammar, we treat NOT IN and NOT EXISTS as a single token.