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51 lines
2.6 KiB
Racket
51 lines
2.6 KiB
Racket
#lang racket/base
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(require brag/support (submod brag/rules/lexer lex-abbrevs) racket/match)
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(provide color-brag)
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(define brag-syntax-lexer
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(lexer-srcloc
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[(eof) (return-without-srcloc eof)]
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;; need to lex whitespace to keep srclocs accurate
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;; (for DrRacket selections etc)
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[whitespace (token 'WHITE lexeme)]
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[(:or (from/to "'" "'") (from/to "\"" "\"")) (token 'LIT lexeme)]
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[(:or (char-set "()[]|+*:") hide-char splice-char) (token 'MISC lexeme)]
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[(:seq (:or "#" ";") (complement (:seq (:* any-char) NL (:* any-char))) (:or NL "")) (token 'COMMENT lexeme)]
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[id (token 'ID lexeme)]
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[any-char (token 'OTHER lexeme)]))
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(define default-backup 10)
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(define (color-brag port [backup default-backup] [in-string? #f])
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(define srcloc-tok (brag-syntax-lexer port))
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(if (eof-object? srcloc-tok)
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(values srcloc-tok 'eof #f #f #f 0 #f)
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(match-let* ([(srcloc-token (token-struct type val _ _ _ _ _) (srcloc _ _ _ posn span)) srcloc-tok]
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[(cons start end) (cons posn (+ posn span))]
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[(cons _ cat) (or (assq type
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'((ID . symbol)
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(LIT . string)
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(MISC . parenthesis)
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(WHITE . whitespace)
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(COMMENT . comment)))
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(cons 'OTHER 'no-color))])
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(values val cat #f start end backup #f))))
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(module+ test
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(require rackunit)
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(define-syntax-rule (values->list EXPR) (call-with-values (λ () EXPR) list))
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(define (apply-colorer str)
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(for/list ([annotation (in-port (λ (p)
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(let ([xs (values->list (color-brag p))])
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(if (eof-object? (car xs)) eof xs)))
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(open-input-string str))])
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annotation))
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(check-equal? (apply-colorer "foo") `(("foo" symbol #f 1 4 ,default-backup #f)))
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(check-equal? (apply-colorer "'str'") `(("'str'" string #f 1 6 ,default-backup #f)))
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(check-equal? (apply-colorer "(foo)+") `(("(" parenthesis #f 1 2 ,default-backup #f)
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("foo" symbol #f 2 5 ,default-backup #f)
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(")" parenthesis #f 5 6 ,default-backup #f)
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("+" parenthesis #f 6 7 ,default-backup #f)))
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(check-equal? (apply-colorer "; rem") `(("; rem" comment #f 1 6 ,default-backup #f)))
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(check-equal? (apply-colorer "◊") `(("◊" no-color #f 1 4 ,default-backup #f))))
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