Edit File by line

<!doctype html>

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<html>

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<head>

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<title>CodeMirror: EBNF Mode</title>

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</head>

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<body>

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<a href="http://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png"></a>

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<ul>

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<li><a href="../../doc/manual.html">Manual</a>

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</ul>

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<ul>

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<li><a href="../index.html">Language modes</a>

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</ul>

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</div>

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<h2>EBNF Mode (bracesMode setting = "javascript")</h2>

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/* description: Parses end executes mathematical expressions. */

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/* lexical grammar */

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%lex

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\s+ /* skip whitespace */

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[0-9]+("."[0-9]+)?\b return 'NUMBER';

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"*" return '*';

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"/" return '/';

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"-" return '-';

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"+" return '+';

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"^" return '^';

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"(" return '(';

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")" return ')';

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"PI" return 'PI';

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"E" return 'E';

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<<EOF>> return 'EOF';

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/lex

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/* operator associations and precedence */

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%left '+' '-'

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%left '*' '/'

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%left '^'

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%left UMINUS

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%start expressions

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%% /* language grammar */

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expressions

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: e EOF

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{print($1); return $1;}

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;

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: e '+' e

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{$$ = $1+$3;}

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| e '-' e

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{$$ = $1-$3;}

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| e '*' e

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{$$ = $1*$3;}

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| e '/' e

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{$$ = $1/$3;}

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| e '^' e

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{$$ = Math.pow($1, $3);}

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| '-' e %prec UMINUS

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{$$ = -$2;}

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| '(' e ')'

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{$$ = $2;}

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| NUMBER

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{$$ = Number(yytext);}

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| E

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{$$ = Math.E;}

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| PI

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{$$ = Math.PI;}

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;</textarea></form>

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var editor = CodeMirror.fromTextArea(document.getElementById("code"), {

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mode: {name: "ebnf"},

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lineNumbers: true,

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bracesMode: 'javascript'

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});

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</script>

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<p> Created by <a href="https://github.com/robertleeplummerjr">Robert Plummer</a></p>

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</article>

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</body>

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</html>

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