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pegjs/examples/arithmetics.pegjs

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