Mercurial > lcfOS

view test/expression.x @ 323:e9fe6988497c

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Used burg for generating expressions
author Windel Bouwman
date Thu, 30 Jan 2014 19:03:24 +0100
parents e84047f29c78
children
line wrap: on
line source


%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};