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

#lang brag
b-program : [b-line] (/NEWLINE [b-line])*
b-line : @b-line-number [b-statement] (/":" [b-statement])*
b-line-number : INTEGER
@b-statement : b-rem | b-end | b-print | b-goto
b-rem : REM
b-end : /"end"
b-print : /"print" [STRING | b-num-expr]
b-goto : /"goto" b-num-expr
b-num-expr : b-sum
b-sum : (b-number /"+")* b-number
@b-number : INTEGER | DECIMAL
rename `br/ragg` as `brag` 8 years ago			`#lang brag`
edits 7 years ago			`b-program : [b-line] (/NEWLINE [b-line])*`
stricter about line breaks, less finicky about blank statements 7 years ago			`b-line : @b-line-number [b-statement] (/":" [b-statement])*`
use newlines in lexer 7 years ago			`b-line-number : INTEGER`
edits 7 years ago			`@b-statement : b-rem \| b-end \| b-print \| b-goto`
boom 7 years ago			`b-rem : REM`
edits 7 years ago			`b-end : /"end"`
			`b-print : /"print" [STRING \| b-num-expr]`
			`b-goto : /"goto" b-num-expr`
			`b-num-expr : b-sum`
the tightening 7 years ago			`b-sum : (b-number /"+")* b-number`
edits 7 years ago			`@b-number : INTEGER \| DECIMAL`