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JavaScript: StringBuilder

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Emulates the StringBuilder() function found in .NET Languages

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  1. /*****************************************************************
  2.  * Stringbuilder Class - emulates the C#/VB.NET stringbuilder
  3.  * @constructor
  4.  *****************************************************************/
  5. function StringBuilder() {
  6.     var strings = [];
  7.  
  8.     this.append = function (string)
  9.     {
  10.         string = verify(string);
  11.         if (string.length > 0) {
  12.             strings[strings.length] = string;
  13.         }
  14.     };
  15.  
  16.     this.appendLine = function (string)
  17.     {
  18.         string = verify(string);
  19.         if (this.isEmpty())
  20.         {
  21.             if (string.length > 0) {
  22.                 strings[strings.length] = string;
  23.             }
  24.             else {
  25.                 return;
  26.             }
  27.         }
  28.         else {
  29.             strings[strings.length] = string.length > 0 ? "
  30. " + string : "
  31. ";
  32.         }
  33.     };
  34.  
  35.     this.clear = function () { strings = []; };
  36.  
  37.     this.isEmpty = function () { return strings.length == 0; };
  38.  
  39.     this.toString = function () { return strings.join(""); };
  40.  
  41.     var verify = function (string)
  42.     {
  43.         if (!defined(string)) {
  44.             return "";
  45.         }
  46.         if (getType(string) != getType('string')) {
  47.             return String(string);
  48.         }
  49.         return string;
  50.     };
  51.  
  52.     var defined = function (el)
  53.     {
  54.         return el != null && typeof(el) != "undefined";
  55.     };
  56.  
  57.     var getType = function (instance)
  58.     {
  59.         if (!defined(instance.constructor)) {
  60.             throw new Error("Unexpected object type");
  61.         }
  62.         var type = String(instance.constructor).match(/function\s+(\w+)/);
  63.  
  64.         return defined(type) ? type[1] : "undefined";
  65.     };
  66. }

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