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<!doctype html><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>.CodeMirror {border-top: 1px solid black; border-bottom: 1px solid black;}</style> </head> <body> <div id=nav> <a href="https://codemirror.net/5"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png" alt=""></a>
<ul> <li><a href="../../index.html">Home</a> <li><a href="../../doc/manual.html">Manual</a> <li><a href="https://github.com/codemirror/codemirror5">Code</a> </ul> <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>
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