Stephen Mallette created TINKERPOP-2533:
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Summary: Develop a grammar for Gremlin
Key: TINKERPOP-2533
URL: https://issues.apache.org/jira/browse/TINKERPOP-2533
Project: TinkerPop
Issue Type: Improvement
Components: process
Affects Versions: 3.5.0
Reporter: Stephen Mallette
Assignee: Stephen Mallette
An ANTLR grammar for Gremlin would allow us to look at Gremlin as more of a
language and to independently consider how that language gets implemented in
each variant. By driving the language development through the grammar rather
than through Java (as we do now), we can avoid problems where Java-oriented
idioms leak into other programming language implementations.
For this initial body of work, the contribution will contain:
* a new {{gremlin-grammar}} maven module
* which will have a ANTLR4 grammar file
* tests for the parser which will extract a corpus of Gremlin traversal from
the gherkin tests and the documentation
This initial contribution will have some limitations initially where certain
types of statements from the testing corpus are simply not supported by the
grammar as it is today. Much of this will have limitation will have to do with
examples using Groovy syntax and lambdas, but there are yet places where the
grammar needs further development. Those limitations can be satisfied by other
pull requests.
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