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-<!doctype html>
-<html>
- <head>
- <title>CodeMirror: EBNF Mode</title>
- <meta charset="utf-8"/>
- <link rel=stylesheet href="../../doc/docs.css">
-
- <link rel="stylesheet" href="../../lib/codemirror.css">
- <script src="../../lib/codemirror.js"></script>
- <script src="../javascript/javascript.js"></script>
- <script src="ebnf.js"></script>
- <style type="text/css">.CodeMirror {border-top: 1px solid black; border-bottom: 1px solid black;}</style>
- </head>
- <body>
- <div id=nav>
- <a href="http://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png"></a>
-
- <ul>
- <li><a href="../../index.html">Home</a>
- <li><a href="../../doc/manual.html">Manual</a>
- <li><a href="https://github.com/codemirror/codemirror">Code</a>
- </ul>
- <ul>
- <li><a href="../index.html">Language modes</a>
- <li><a class=active href="#">EBNF Mode</a>
- </ul>
- </div>
-
- <article>
- <h2>EBNF Mode (bracesMode setting = "javascript")</h2>
- <form><textarea id="code" name="code">
-/* description: Parses end executes mathematical expressions. */
-
-/* lexical grammar */
-%lex
-
-%%
-\s+ /* skip whitespace */
-[0-9]+("."[0-9]+)?\b return 'NUMBER';
-"*" return '*';
-"/" return '/';
-"-" return '-';
-"+" return '+';
-"^" return '^';
-"(" return '(';
-")" return ')';
-"PI" return 'PI';
-"E" return 'E';
-&lt;&lt;EOF&gt;&gt; return 'EOF';
-
-/lex
-
-/* operator associations and precedence */
-
-%left '+' '-'
-%left '*' '/'
-%left '^'
-%left UMINUS
-
-%start expressions
-
-%% /* language grammar */
-
-expressions
-: e EOF
-{print($1); return $1;}
-;
-
-e
-: e '+' e
-{$$ = $1+$3;}
-| e '-' e
-{$$ = $1-$3;}
-| e '*' e
-{$$ = $1*$3;}
-| e '/' e
-{$$ = $1/$3;}
-| e '^' e
-{$$ = Math.pow($1, $3);}
-| '-' e %prec UMINUS
-{$$ = -$2;}
-| '(' e ')'
-{$$ = $2;}
-| NUMBER
-{$$ = Number(yytext);}
-| E
-{$$ = Math.E;}
-| PI
-{$$ = Math.PI;}
-;</textarea></form>
- <script>
- var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
- mode: {name: "ebnf"},
- lineNumbers: true,
- bracesMode: 'javascript'
- });
- </script>
- <h3>The EBNF Mode</h3>
- <p> Created by <a href="https://github.com/robertleeplummerjr">Robert Plummer</a></p>
- </article>
- </body>
-</html>