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30 lines
1.1 KiB
Racket
30 lines
1.1 KiB
Racket
#lang br
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(require "lexer.rkt" brag/support)
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(provide basic-colorer)
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(define (basic-colorer port)
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(define next-char (peek-char port))
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(define (handle-read-error exn)
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(define exn-srclocs (exn:fail:read-srclocs exn))
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(srcloc-token (token 'ERROR (string next-char)) (car exn-srclocs)))
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(define srcloc-tok (with-handlers ([exn:fail:read? handle-read-error])
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(basic-lexer port)))
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(cond
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[(eof-object? srcloc-tok) (values srcloc-tok 'eof #f #f #f)]
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[else
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(match-define (srcloc-token (token-struct type val _ _ _ _ _)
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(srcloc _ _ _ pos span)) srcloc-tok)
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(match-define (list cat paren)
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(match type
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['STRING '(string #f)]
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['REM '(comment #f)]
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['ERROR '(error #f)]
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[else (match val
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[(? number?)'(constant #f)]
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[(? symbol?) '(symbol #f)]
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["(" '(parenthesis |(|)]
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[")" '(parenthesis |)|)]
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[else '(no-color #f)])]))
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(values (or val "") cat paren pos (+ pos span))]))
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(apply-colorer basic-colorer "foo") |