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54 lines
2.4 KiB
Racket
54 lines
2.4 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 (:: "\"" "\\" "\"" "\"") ; string containg double-quote = "\""
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(from/to "'" "'")
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(from/to "\"" "\"")) (token 'LIT lexeme)]
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[(:or "()" "Ø" "∅") (token 'NO-COLOR lexeme)] ; empty set symbols
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[(:or (char-set "()[]{}|+*:?") hide-char splice-char "::=") (token 'MISC lexeme)]
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[(from/to "(*" "*)") (token 'COMMENT 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 (color-brag port)
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(define srcloc-tok (brag-syntax-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 _ _ _ _ _) (srcloc _ _ _ posn span)) srcloc-tok)
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(match-define (list start end) (list posn (+ posn span)))
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(values val (case 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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[else 'no-color]) #f start end)]))
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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)))
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(check-equal? (apply-colorer "'str'") `(("'str'" string #f 1 6)))
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(check-equal? (apply-colorer "(foo)+") `(("(" parenthesis #f 1 2)
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("foo" symbol #f 2 5)
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(")" parenthesis #f 5 6)
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("+" parenthesis #f 6 7)))
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(check-equal? (apply-colorer "; rem") `(("; rem" comment #f 1 6)))
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(check-equal? (apply-colorer "◊") `(("◊" no-color #f 1 4))))
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