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beautiful-racket/beautiful-racket-demo/basic-demo/parser.rkt

15 lines
362 B
Racket

#lang brag
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b-program : b-line*
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b-line : @b-line-number b-statement (/":" b-statement)*
b-line-number : INTEGER
@b-statement : b-rem
| b-print
| b-goto
| b-end
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b-rem : REM
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b-print : /"print" (STRING | b-expr)*
b-goto : /"goto" b-expr
b-expr : b-sum
b-sum : (b-number /"+")* b-number
@b-number : INTEGER | DECIMAL
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b-end : /"end"