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| <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> | |
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| <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> | |
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| <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> | |