玛氪宕·梦魔(Markdown Memo)，使用Markdown的云端备忘录，百度IFE的RIA启航班的不合格的作业，才……才没有什么阴谋呢！
源gitee链接https://gitee.com/arathi/MarkdownMemo?_from=gitee_search
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
102 lines
2.4 KiB
102 lines
2.4 KiB
<!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 type="text/css">.CodeMirror {border-top: 1px solid black; border-bottom: 1px solid black;}</style>
|
|
</head>
|
|
<body>
|
|
<div id=nav>
|
|
<a href="http://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png"></a>
|
|
|
|
<ul>
|
|
<li><a href="../../index.html">Home</a>
|
|
<li><a href="../../doc/manual.html">Manual</a>
|
|
<li><a href="https://github.com/codemirror/codemirror">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>
|