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25 lines
1.0 KiB
Racket
25 lines
1.0 KiB
Racket
#lang br
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(require 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-src-pos
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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) (return-without-pos (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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["true" (token 'TRUE #t)]
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["false" (token 'FALSE #f)]
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[(repetition 1 +inf.0 numeric) (token 'NUMBER (string->number lexeme))]
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; bugaboo: "10" is ambiguous: number or binary number?
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[(repetition 1 +inf.0 (char-set "01")) (token 'BINARY-NUMBER (string->number lexeme 2))]
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[(:seq (repetition 1 1 alphabetic) (repetition 0 +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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