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23 lines
951 B
Racket
23 lines
951 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-src-pos
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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 "load" "output-list" "output-file" "compare-to" "set" "eval" "output" (char-set ",;")) lexeme]
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[(seq "%" (repetition 1 +inf.0 (union alphabetic numeric (char-set ".")))) (token 'FORMAT-STRING lexeme)]
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[(repetition 1 +inf.0 numeric) (token 'VAL (string->number lexeme))]
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[(repetition 1 +inf.0 (union alphabetic numeric (char-set "-."))) (token 'ID lexeme)]))
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(get-token input-port))
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next-token)
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