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23 lines
530 B
JavaScript
23 lines
530 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
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= additive
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additive
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= left:multiplicative "+" right:additive { return left + right; }
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/ multiplicative
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multiplicative
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= left:primary "*" right:multiplicative { return left * right; }
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/ primary
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primary
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= integer
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/ "(" additive:additive ")" { return additive; }
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integer "integer"
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= digits:[0-9]+ { return parseInt(digits.join(""), 10); }
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