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<script src="ebnf.js"></script>
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<h1>CodeMirror</h1>
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<a href="https://github.com/codemirror/codemirror">Code</a>
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<ul>
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<a href="../index.html">Language modes</a>
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<li>
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<a class=active href="#">EBNF Mode</a>
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</ul>
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</div>
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<article>
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<h2>EBNF Mode (bracesMode setting = "javascript")</h2>
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<form>
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<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 '^';
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"(" return '('; ")" return ')'; "PI" return 'PI'; "E" return 'E'; <<EOF>> return 'EOF'; /lex /* operator associations and precedence */ %left '+' '-' %left '*' '/' %left '^' %left UMINUS %start expressions %% /* language
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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
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')' {$$ = $2;} | NUMBER {$$ = Number(yytext);} | E {$$ = Math.E;} | PI {$$ = Math.PI;} ;</textarea>
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</form>
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<script>
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var editor = CodeMirror.fromTextArea(document.getElementById("code"),
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{
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mode:
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{
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name: "ebnf"
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},
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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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<h3>The EBNF Mode</h3>
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<p> Created by
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<a href="https://github.com/robertleeplummerjr">Robert Plummer</a>
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</p>
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</article>
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</body>
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</html>
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