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view test/expression.x @ 396:fb3c1f029b30

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Added baselexer into c3 lexer
author Windel Bouwman
date Tue, 27 May 2014 22:19:32 +0200
parents e84047f29c78
children
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%tokens '+' number '(' ')' '*'
%%

input: expression {return $1};

expression: term { return $1 }
          | expression '+' term {};

term: factor { return $1 }
    | term '*' factor { return $1 * $3 };

factor: '(' expression ')'
      | number {return $1.val};