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