You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
beautiful-racket/beautiful-racket-demo/algebra-demo/main.rkt

38 lines
1019 B
Racket

This file contains invisible Unicode characters!

This file contains invisible Unicode characters that may be processed differently from what appears below. If your use case is intentional and legitimate, you can safely ignore this warning. Use the Escape button to reveal hidden characters.

#lang br/quicklang
(require brag/support "grammar.rkt")
(provide top fun expr app)
(module+ reader
(provide read-syntax))
(define-lex-abbrev reserved-toks
(:or "fun" "(" ")" "=" "+" ","))
(define tokenize-1
(lexer-srcloc
[whitespace (token lexeme #:skip? #t)]
[(from/stop-before "#" "\n") (token 'COMMENT #:skip? #t)]
[reserved-toks lexeme]
[(:+ alphabetic) (token 'ID (string->symbol lexeme))]
[(:+ (char-set "0123456789")) (token 'INT (string->number lexeme))]))
(define-macro top #'#%module-begin)
(define-macro-cases fun
[(_ VAR ARG0 EXPR) #'(define (VAR ARG0) EXPR)]
[(_ VAR ARG0 ARG1 EXPR) #'(define (VAR ARG0 ARG1) EXPR)])
(define-macro-cases expr
[(_ LEFT RIGHT) #'(+ LEFT RIGHT)]
[(_ OTHER) #'OTHER])
(define-macro app #'#%app)
(define (read-syntax src ip)
(port-count-lines! ip)
(lexer-file-path src)
(define parse-tree (parse src (λ () (tokenize-1 ip))))
(strip-bindings
(with-syntax ([PT parse-tree])
#'(module algebra-mod algebra-demo
PT))))