lib/dojo/data/util/filter.js.uncompressed.js

   1 define("dojo/data/util/filter", ["../../_base/lang"], function(lang){
   2         // module:
   3         //              dojo/data/util/filter
   4         // summary:
   5         //              TODOC
   6
   7 var filter = {};
   8 lang.setObject("dojo.data.util.filter", filter);
   9
  10 filter.patternToRegExp = function(/*String*/pattern, /*boolean?*/ ignoreCase){
  11         // summary:
  12         //              Helper function to convert a simple pattern to a regular expression for matching.
  13         // description:
  14         //              Returns a regular expression object that conforms to the defined conversion rules.
  15         //              For example:
  16         //
  17         //              - ca*   -> /^ca.*$/
  18         //              - *ca*  -> /^.*ca.*$/
  19         //              - *c\*a*  -> /^.*c\*a.*$/
  20         //              - *c\*a?*  -> /^.*c\*a..*$/
  21         //
  22         //              and so on.
  23         // pattern: string
  24         //              A simple matching pattern to convert that follows basic rules:
  25         //
  26         //              - * Means match anything, so ca* means match anything starting with ca
  27         //              - ? Means match single character.  So, b?b will match to bob and bab, and so on.
  28         //              - \ is an escape character.  So for example, \* means do not treat * as a match, but literal character *.
  29         //
  30         //              To use a \ as a character in the string, it must be escaped.  So in the pattern it should be
  31         //              represented by \\ to be treated as an ordinary \ character instead of an escape.
  32         // ignoreCase:
  33         //              An optional flag to indicate if the pattern matching should be treated as case-sensitive or not when comparing
  34         //              By default, it is assumed case sensitive.
  35
  36         var rxp = "^";
  37         var c = null;
  38         for(var i = 0; i < pattern.length; i++){
  39                 c = pattern.charAt(i);
  40                 switch(c){
  41                         case '\\':
  42                                 rxp += c;
  43                                 i++;
  44                                 rxp += pattern.charAt(i);
  45                                 break;
  46                         case '*':
  47                                 rxp += ".*"; break;
  48                         case '?':
  49                                 rxp += "."; break;
  50                         case '$':
  51                         case '^':
  52                         case '/':
  53                         case '+':
  54                         case '.':
  55                         case '|':
  56                         case '(':
  57                         case ')':
  58                         case '{':
  59                         case '}':
  60                         case '[':
  61                         case ']':
  62                                 rxp += "\\"; //fallthrough
  63                         default:
  64                                 rxp += c;
  65                 }
  66         }
  67         rxp += "$";
  68         if(ignoreCase){
  69                 return new RegExp(rxp,"mi"); //RegExp
  70         }else{
  71                 return new RegExp(rxp,"m"); //RegExp
  72         }
  73
  74 };
  75
  76 return filter;
  77 });