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        <title>CodeMirror: EBNF Mode</title>
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                        <a class=active href="#">EBNF Mode</a>
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            <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 %% /* 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>
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