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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'; <<EOF>> 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>