Better error message in case of empty Parser class

Question

Closed this issue 8 years ago · 6 comments

If the Parser class is empty and does not contain any rules, racc fails to generate the parser Ruby file.

This is an unexpected error and should ideally be done away with.

1.4.14

Answer 1 · 2016-08-14T11:24:10.000Z

Every grammar needs a start rule. If there is no start rule, what code do you propose the generated parser should contain?

Answer 2 · 2016-08-14T13:47:46.000Z

Ah yes. I'm sorry you have a point.

Then how about having an informative error message incase of an empty Parser class stating that the class cannot be left empty?

Answer 3 · 2016-08-14T13:48:52.000Z

It currently shows this: racc: lib/rubex/parser.racc: parser.racc:3: unexpected token 'end'

Answer 4 · 2016-08-14T18:35:47.000Z

Sounds good to me. Are you using Racc 1.4.14 or 2.0.0-dev?

Answer 5 · 2016-11-30T16:21:03.000Z

I have pushed a fix for this to master.