Add Language detection and dispatch logic#210
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Imported racket-lexer does not return a good meaningful type for some tokens, so add a extra pass to normalize them.
Add doc-lang module for parseing #lang, #reader, and raw module forms, extract language info, and match against a predefined known language list. Fallback to URI suffix based recognization if not found language header.
dannypsnl
reviewed
Apr 25, 2026
- Stop pass indenter to services, it's not used by them - Improve dignostics module - Skip formatting for not-Sexp languages - Move indenter lookup into doc-lang.rkt
And make test not require rhombus installed.
Also removed get-indenter test because it returns false now for all builtin languages.
dannypsnl
reviewed
Apr 26, 2026
Extract snapshot.rkt and state.rkt from monolithic lexer.rkt, update callers and tests.
Fix semantic-token requests that miss current lexer-derived `#;` comment tokens after expansion has already failed. Add Check-Syntax-Status struct and gate semantic-token wait on running status: - Rename new-trace to check-syntax-finished scheduler signal. Add with-read-safedoc / with-write-safedoc eliminators.
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The current LSP server's behavior for non-Racket or non-Lisp languages is unclear. For example, we don't have clear idea what features support what languages. Almost all features target to Racket, but services that operate on expanded code seems more general purpose.
This PR adds language detection and dispatch logic depends on language. And define clear behavior of features for various languages.
TODO:
#lang ...(including#lang reader ...),#reader ...,(module id mod-path ...), if no languag header found, fallback to guess language from special file suffix, like.rhm,.scrbl#;The language header detection is based on the Sexp token tree parser. I didn't use regex because comments can appear before language line, especially Sexp comment. So it builds a small Sexp token tree before the language header. Then recognize the language, if it's in the predefined list, and is a Sexp language, the token tree parser will continue to parse the rest code (continue parsing logic not yet implemented). For non-Sexp language, its Sexp token tree only contains the code before and including the language header. If the language header is missing, the Sexp token tree parser can potentially read the whole document.
The token tree parser can also support non Sexp, but not yet. Because each non Sexp language can have its special syntax, and make the implementation more complex.