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Limited run only? GNU Bison gives D a try

Submitted by Roy Schestowitz on Monday 6th of January 2020 05:29:39 PM Filed under
Development
GNU

Bison, a parser generator hosted by the GNU project, is now available in version 3.5, reducing the footprint of small parsers and improving syntax error handling.

The latter is now only promoted for use in error messages, while the Bison team warns against applying string literals to avoid implementing keyword matching in the scanner. It is still supported though, at least for now, and the new diagnostic -Wdangling-alias helps in catching related errors.

Users working with Bison for C++ now get to enjoy lookahead correction (LAC). It has been added to the parsing algorithm and can be enabled with the %define parse.lac directive. LAC is meant to improve syntax error handling by suspending normal parsing whenever a new token is fetched from the scanner and exploring the next action. If it reaches a shift action during that exploratory parse, normal parsing resumes, while an error is reported if that isn’t the case.

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