27 lines
645 B
JSON
27 lines
645 B
JSON
{
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"comment": "Grammar showing precedence operators and semantic actions.",
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"lex": {
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"rules": [
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["\\s+", "/* skip whitespace */"],
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["[0-9]+", "return 'NAT';"],
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["\\+", "return '+';"],
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["\\*", "return '*';"],
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["$", "return 'EOF';"]
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]
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},
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"tokens": "NAT + * EOF",
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"operators": [
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["left", "+"],
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["left", "*"]
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],
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"bnf": {
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"S" :[[ "e EOF", "return $1;" ]],
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"e" :[[ "e + e", "$$ = [$1,'+', $3];" ],
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[ "e * e", "$$ = [$1, '*', $3];" ],
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[ "NAT", "$$ = parseInt(yytext);" ]]
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}
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}
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