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32 lines
930 B
Plaintext
32 lines
930 B
Plaintext
start : _ expression { return $2; }
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expression : additive
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additive : multiplicative (plus / minus) additive {
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if ($2 === "+") { return $1 + $3; }
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if ($2 === "-") { return $1 - $3; }
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}
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/ multiplicative
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multiplicative : primary (times / divide) multiplicative {
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if ($2 === "*") { return $1 * $3; }
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if ($2 === "/") { return $1 / $3; }
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}
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/ primary
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primary : integer
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/ lparen expression rparen { return $2 }
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integer "integer"
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: [0-9]+ _ { return parseInt($1.join("")); }
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plus : "+" _ { return $1; }
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minus : "-" _ { return $1; }
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times : "*" _ { return $1; }
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divide : "/" _ { return $1; }
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lparen : "(" _
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rparen : ")" _
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_ "whitespace"
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: [ \t\n\r]*
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