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32 lines
1.0 KiB
Racket
32 lines
1.0 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 (handle-lexer-error excn)
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(define excn-srclocs (exn:fail:read-srclocs excn))
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(srcloc-token (token 'ERROR) (car excn-srclocs)))
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(define srcloc-tok
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(with-handlers ([exn:fail:read? handle-lexer-error])
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(basic-lexer port)))
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(match srcloc-tok
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[(? eof-object?) (values srcloc-tok 'eof #f #f #f)]
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[else
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(match-define
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(srcloc-token
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(token-struct type val _ _ _ _ _)
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(srcloc _ _ _ posn span)) srcloc-tok)
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(define start posn)
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(define end (+ start span))
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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 val cat paren start end)])) |