Function parse 

pub fn parse(input: &str) -> Result<ParseTree, GremlinParseError>

Parses a Gremlin query list — one or more ;-separated traversals — the grammar’s top-level queryList entry rule.

Returns the parse tree on success. If the input is syntactically invalid, returns GremlinParseError::Syntax (which still carries the recovered tree), or GremlinParseError::Runtime on an unrecoverable error.

Errors

Returns GremlinParseError if the input is not valid Gremlin.