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beautiful-racket/beautiful-racket-demo/algebra-demo/main.rkt

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854 B
Racket

#lang br/quicklang
(require brag/support "grammar.rkt")
(provide (all-defined-out) #%module-begin)
(module+ reader
(provide read-syntax))
(define-lex-abbrev reserved-toks
(:or "fun" "(" ")" "=" "+" ","))
(define lex
(lexer
[whitespace (lex input-port)]
[reserved-toks lexeme]
[alphabetic (token 'ID (string->symbol lexeme))]
[(:+ (char-set "0123456789")) (token 'INT (string->number lexeme))]))
(define-macro top #'begin)
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(define-macro (func-def VAR VARS EXPR)
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#'(define (VAR . VARS) EXPR))
(define-macro-cases expr
[(_ LEFT "+" RIGHT) #'(+ LEFT RIGHT)]
[(_ OTHER) #'OTHER])
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(define-macro func-app #'#%app)
(define (read-syntax src ip)
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(define token-thunk (λ () (lex ip)))
(define parse-tree (parse token-thunk))
(strip-context
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(with-syntax ([PT parse-tree])
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#'(module mod-name algebra-demo
PT))))