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

24 lines
686 B
Racket

#lang brag
top : @statement*
statement : (assignment | expr | return) /";" | if | while
assignment : /"var" id /"=" expr
@expr : comparison
comparison : [comparison ("!=" | "==")] sumlike
sumlike : [@sumlike /"+"] value
@value : id | INTEGER | STRING | object
| func-def | func-app | increment
increment : id /"++"
object : /"{" @kvs /"}"
kvs : [kv (/"," kv)*]
/kv : expr /":" expr
func-def : /"function" /"(" ids /")" @block
/ids : [id (/"," id)*]
@id : ID | dotted-id
dotted-id : DOTTED-ID
block : /"{" @statement* /"}"
return : /"return" expr
func-app : id /"(" @exprs /")"
exprs : [expr (/"," expr)*]
if : /"if" /"(" expr /")" @block
while : /"while" /"(" expr /")" @block