How to add "... expected {TOKEN}" to error messages?
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- Dominant language
- Yacc
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Description
Hi! I've been using Racc very happily with graphql-ruby for a while now. It's easy-to-use and fast, so thanks for maintaining it!
I'd like to improve the error messages to have some helpful info, for example, instead of:
Parse error on ")" at [1, 17]
I'd like to say:
Parse error on ")" at [1,17] (expected ":")
However, in reviewing the on_error docs, I don't see a way to access which token was expected. Is it possible to do that with Racc?
Thanks!
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the Racc::Parser on_error documentation linked in the issue, then trace the parser's error-handling entry point to determine whether the expected token is available there. Compare the current error format with the requested example; done means establishing a documented, testable way to include expected-token information or clearly documenting why it cannot be exposed.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- ruby
- Domain
- compilers
- Issue type
- Feature
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 30/100