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50 lines
1.6 KiB
Racket
50 lines
1.6 KiB
Racket
#lang br
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(require brag/support syntax-color/racket-lexer
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racket/contract)
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(define jsonic-lexer
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(lexer
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[(eof) (values lexeme 'eof #f #f #f)]
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[(:or "@$" "$@")
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(values lexeme 'parenthesis
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(if (equal? lexeme "@$") '|(| '|)|)
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(pos lexeme-start) (pos lexeme-end))]
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[(from/to "//" "\n")
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(values lexeme 'comment #f
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(pos lexeme-start) (pos lexeme-end))]
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[any-char
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(values lexeme 'string #f
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(pos lexeme-start) (pos lexeme-end))]))
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(define (color-jsonic port offset racket-coloring-mode?)
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(cond
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[(or (not racket-coloring-mode?)
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(equal? (peek-string 2 0 port) "$@"))
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(define-values (str cat paren start end)
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(jsonic-lexer port))
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(define switch-to-racket-mode (equal? str "@$"))
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(values str cat paren start end 0 switch-to-racket-mode)]
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[else
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(define-values (str cat paren start end)
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(racket-lexer port))
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(values str cat paren start end 0 #t)]))
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(provide
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(contract-out
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[color-jsonic
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(input-port? exact-nonnegative-integer? boolean?
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. -> . (values
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(or/c string? eof-object?)
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symbol?
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(or/c symbol? #f)
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(or/c exact-positive-integer? #f)
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(or/c exact-positive-integer? #f)
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exact-nonnegative-integer?
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boolean?))]))
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(module+ test
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(require rackunit)
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(check-equal? (values->list
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(color-jsonic (open-input-string "x") 0 #f))
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(list "x" 'string #f 1 2 0 #f)))
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