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