github.com/elliott5/community@v0.14.1-0.20160709191136-823126fb026a/app/public/codemirror/mode/ebnf/index.html (about)

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    25          <li><a class=active href="#">EBNF Mode</a>
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    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>
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