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18 lines
544 B
JavaScript
18 lines
544 B
JavaScript
/*
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* Classic example grammar, which recognizes simple arithmetic expressions like
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* "2*(3+4)". The parser generated from this grammar then computes their value.
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*/
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start = additive
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additive = multiplicative "+" additive { return $1 + $3; }
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/ multiplicative
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multiplicative = primary "*" multiplicative { return $1 * $3; }
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/ primary
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primary = integer
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/ "(" additive ")" { return $2; }
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integer "integer" = [0-9]+ { return parseInt($1.join(""), 10); }
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