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      1 <!doctype html>
      2 <html>
      3   <head>
      4     <title>CodeMirror: EBNF Mode</title>
      5     <meta charset="utf-8"/>
      6     <link rel=stylesheet href="../../doc/docs.css">
      7 
      8     <link rel="stylesheet" href="../../lib/codemirror.css">
      9     <script src="../../lib/codemirror.js"></script>
     10     <script src="../javascript/javascript.js"></script>
     11     <script src="ebnf.js"></script>
     12     <style type="text/css">.CodeMirror {border-top: 1px solid black; border-bottom: 1px solid black;}</style>
     13   </head>
     14   <body>
     15     <div id=nav>
     16       <a href="http://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png"></a>
     17 
     18       <ul>
     19         <li><a href="../../index.html">Home</a>
     20         <li><a href="../../doc/manual.html">Manual</a>
     21         <li><a href="https://github.com/codemirror/codemirror">Code</a>
     22       </ul>
     23       <ul>
     24         <li><a href="../index.html">Language modes</a>
     25         <li><a class=active href="#">EBNF Mode</a>
     26       </ul>
     27     </div>
     28 
     29     <article>
     30       <h2>EBNF Mode (bracesMode setting = "javascript")</h2>
     31       <form><textarea id="code" name="code">
     32 /* description: Parses end executes mathematical expressions. */
     33 
     34 /* lexical grammar */
     35 %lex
     36 
     37 %%
     38 \s+                   /* skip whitespace */
     39 [0-9]+("."[0-9]+)?\b  return 'NUMBER';
     40 "*"                   return '*';
     41 "/"                   return '/';
     42 "-"                   return '-';
     43 "+"                   return '+';
     44 "^"                   return '^';
     45 "("                   return '(';
     46 ")"                   return ')';
     47 "PI"                  return 'PI';
     48 "E"                   return 'E';
     49 &lt;&lt;EOF&gt;&gt;               return 'EOF';
     50 
     51 /lex
     52 
     53 /* operator associations and precedence */
     54 
     55 %left '+' '-'
     56 %left '*' '/'
     57 %left '^'
     58 %left UMINUS
     59 
     60 %start expressions
     61 
     62 %% /* language grammar */
     63 
     64 expressions
     65 : e EOF
     66 {print($1); return $1;}
     67 ;
     68 
     69 e
     70 : e '+' e
     71 {$$ = $1+$3;}
     72 | e '-' e
     73 {$$ = $1-$3;}
     74 | e '*' e
     75 {$$ = $1*$3;}
     76 | e '/' e
     77 {$$ = $1/$3;}
     78 | e '^' e
     79 {$$ = Math.pow($1, $3);}
     80 | '-' e %prec UMINUS
     81 {$$ = -$2;}
     82 | '(' e ')'
     83 {$$ = $2;}
     84 | NUMBER
     85 {$$ = Number(yytext);}
     86 | E
     87 {$$ = Math.E;}
     88 | PI
     89 {$$ = Math.PI;}
     90 ;</textarea></form>
     91       <script>
     92         var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
     93           mode: {name: "ebnf"},
     94           lineNumbers: true,
     95           bracesMode: 'javascript'
     96         });
     97       </script>
     98       <h3>The EBNF Mode</h3>
     99       <p> Created by <a href="https://github.com/robertleeplummerjr">Robert Plummer</a></p>
    100     </article>
    101   </body>
    102 </html>