CODEWITHSUNDEEP
keywordcase-insensitiverascal
Olav Trauschke
Olav Trauschke

Reputation: 136

Use case-insensitve keywords in Rascal (workaround)

Does anyone know a way how I could reserve keyword in a case-insensitve way in Rascal?

Due to issue #968 as reported on GitHub (https://github.com/usethesource/rascal/issues/968) I cannot simply use single quotes. This issue will probably be solved. ince I am currently working with a language where keywords are not case-sensitive and trying to analyze code in which someone apparently randomly applied camelcase or all capitals in keywords, however, I am looking for a workaround. For now I am just defining each keyword in three ways. Since there are mistakes in application of camelcase,(like GroupbyGroup, which should have been GroupByGroup in camelcase) I keep having to redefine keywords in even more different ways. Therefore, I was hoping someone would know of a better workaround (or can solve this issue obviously).

Upvotes: 0

Views: 50

Answers (1)

Davy Landman
Davy Landman

Reputation: 15439

The following grammar is automatically extended to define what 'abc' means

lexical CaseInsensitive = 'abc';

like so:

lexical CaseInsensitive = 'abc';
lexical 'abc' = [aA][bB][cC];

You could do that by yourself as well for your grammar, but it will not change the semantics of disambiguation. The \ notation simply does not subtract the regular languages generated by [aA][bB][cC] from the context-free language yet. It is not implemented.

A good temporary workaround would be to keep the grammar ambiguous, and use rascal code to filter out the correct tree.

Upvotes: 1

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