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.
20 lines
675 B
JavaScript
20 lines
675 B
JavaScript
/*
|
|
* Classic example grammar, which recognizes simple arithmetic expressions like
|
|
* "2*(3+4)". The parser generated from this grammar then computes their value.
|
|
*/
|
|
|
|
start : additive
|
|
|
|
additive : multiplicative "+" additive { return $1 + $3; }
|
|
/ multiplicative "-" additive { return $1 - $3; }
|
|
/ multiplicative
|
|
|
|
multiplicative : primary "*" multiplicative { return $1 * $3; }
|
|
/ primary "/" multiplicative { return $1 / $3; }
|
|
/ primary
|
|
|
|
primary : integer
|
|
/ "(" additive ")" { return $2; }
|
|
|
|
integer "integer" : [0-9]+ { return parseInt($1.join("")); }
|