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22 lines
736 B
Racket
22 lines
736 B
Racket
#lang br
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(require parser-tools/lex parser-tools/lex-sre
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brag/support
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racket/string)
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(provide tokenize)
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(define (tokenize input-port)
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(define (next-token)
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(define get-token
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(lexer
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[(eof) eof]
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[(union
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(seq "/*" (complement (seq any-string "*/" any-string)) "*/")
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(seq "//" (repetition 1 +inf.0 (char-complement #\newline)) #\newline))
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(token 'COMMENT lexeme #:skip? #t)]
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[(union #\tab #\space #\newline) (get-token input-port)]
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[(union "CHIP" "IN" "OUT" "PARTS:") lexeme]
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[(char-set "{}(),;=") lexeme]
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[(repetition 1 +inf.0 (union alphabetic numeric "-")) (token 'ID (string->symbol lexeme))]))
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(get-token input-port))
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next-token)
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