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24.10
author Coffee CMS <info@coffee-cms.ru>
date Fri, 11 Oct 2024 22:40:23 +0000
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-1:000000000000 0:78edf6b517a0
1 <!doctype html>
2 <html>
3 <head>
4 <title>CodeMirror: EBNF Mode</title>
5 <meta charset="utf-8"/>
6 <link rel=stylesheet href="../../doc/docs.css">
7
8 <link rel="stylesheet" href="../../lib/codemirror.css">
9 <script src="../../lib/codemirror.js"></script>
10 <script src="../javascript/javascript.js"></script>
11 <script src="ebnf.js"></script>
12 <style>.CodeMirror {border-top: 1px solid black; border-bottom: 1px solid black;}</style>
13 </head>
14 <body>
15 <div id=nav>
16 <a href="https://codemirror.net/5"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png" alt=""></a>
17
18 <ul>
19 <li><a href="../../index.html">Home</a>
20 <li><a href="../../doc/manual.html">Manual</a>
21 <li><a href="https://github.com/codemirror/codemirror5">Code</a>
22 </ul>
23 <ul>
24 <li><a href="../index.html">Language modes</a>
25 <li><a class=active href="#">EBNF Mode</a>
26 </ul>
27 </div>
28
29 <article>
30 <h2>EBNF Mode (bracesMode setting = "javascript")</h2>
31 <form><textarea id="code" name="code">
32 /* description: Parses end executes mathematical expressions. */
33
34 /* lexical grammar */
35 %lex
36
37 %%
38 \s+ /* skip whitespace */
39 [0-9]+("."[0-9]+)?\b return 'NUMBER';
40 "*" return '*';
41 "/" return '/';
42 "-" return '-';
43 "+" return '+';
44 "^" return '^';
45 "(" return '(';
46 ")" return ')';
47 "PI" return 'PI';
48 "E" return 'E';
49 &lt;&lt;EOF&gt;&gt; return 'EOF';
50
51 /lex
52
53 /* operator associations and precedence */
54
55 %left '+' '-'
56 %left '*' '/'
57 %left '^'
58 %left UMINUS
59
60 %start expressions
61
62 %% /* language grammar */
63
64 expressions
65 : e EOF
66 {print($1); return $1;}
67 ;
68
69 e
70 : e '+' e
71 {$$ = $1+$3;}
72 | e '-' e
73 {$$ = $1-$3;}
74 | e '*' e
75 {$$ = $1*$3;}
76 | e '/' e
77 {$$ = $1/$3;}
78 | e '^' e
79 {$$ = Math.pow($1, $3);}
80 | '-' e %prec UMINUS
81 {$$ = -$2;}
82 | '(' e ')'
83 {$$ = $2;}
84 | NUMBER
85 {$$ = Number(yytext);}
86 | E
87 {$$ = Math.E;}
88 | PI
89 {$$ = Math.PI;}
90 ;</textarea></form>
91 <script>
92 var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
93 mode: {name: "ebnf"},
94 lineNumbers: true,
95 bracesMode: 'javascript'
96 });
97 </script>
98 <h3>The EBNF Mode</h3>
99 <p> Created by <a href="https://github.com/robertleeplummerjr">Robert Plummer</a></p>
100 </article>
101 </body>
102 </html>