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    <title>CodeMirror: EBNF Mode</title>
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    <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