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33 lines
1.1 KiB
Racket
33 lines
1.1 KiB
Racket
7 years ago
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#lang br/quicklang
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(require "grammar.rkt" brag/support)
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(module+ reader
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(provide read-syntax))
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(define-lex-abbrev reserved-terms
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(:or "var" "=" ";" "+" "{" "}" "'" "\""
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":" "," "(" ")" "//" "/*" "*/"
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"if" "while" "==" "!=" "function" "return" "++"))
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(define lex
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(lexer
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[(:or (from/stop-before "//" "\n")
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(from/to "/*" "*/")) (token 'COMMENT #:skip? #t)]
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[reserved-terms (token lexeme (string->symbol lexeme))]
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[(:+ (:- (:or alphabetic punctuation) "." reserved-terms))
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(token 'ID (string->symbol lexeme))]
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[(:+ (:- (:or alphabetic punctuation) reserved-terms))
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(token 'DOTTED-ID (map string->symbol (string-split lexeme ".")))]
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[(:+ (char-set "0123456789"))
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(token 'INTEGER (string->number lexeme))]
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[(:or (from/to "\"" "\"") (from/to "'" "'"))
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(token 'STRING (string-trim lexeme (substring lexeme 0 1)))]
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[whitespace (token 'WHITE #:skip? #t)]
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[any-char lexeme]))
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(define (read-syntax src ip)
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(define parse-tree (parse (λ () (lex ip))))
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(strip-context
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(with-syntax ([PT parse-tree])
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#'(module _ javascriptlike-demo/expander
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PT))))
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