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beautiful-racket/beautiful-racket-demo/precalc-demo/grammar.rkt

12 lines
328 B
Racket

7 years ago
#lang brag
top : (fun | app)*
fun : /"fun" var /"(" argvars /")" /"=" expr
/argvars : [var (/"," var)*]
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@expr : add-or-sub
add-or-sub : [add-or-sub ("+" | "-")] mult-or-div
mult-or-div : [mult-or-div ("*" | "/")] value
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@value : var | int | app | /"(" expr /")"
int : ["-"] INT
app : var /"(" [expr (/"," expr)*] /")"
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@var : ID