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Sprintf Like Utilities For JScript
 
 
This code can be used to produce formated strings. Mostly useful for WSH and text areas displayed with fixed fonts.
 
 
  1. // sprintf realization

  2. // Samples:

  3. // WScript.Echo("%15l%10r%10r%10r%10r".format(new Array("NAME","TYPE","LENGTH","PRECISION","SCALE")) );

  4. // or using the sprintf

  5. // WScript.Echo(sprintf("%15l%10r%10r%10r%10r","NAME","TYPE","LENGTH","PRECISION","SCALE");

  6. // Format description:

  7. //  Use format string and attached format function.

  8. //  Pass to it array of printed arguments

  9. //  or use the sprintf helper function.

  10. //  Format specifiers are:

  11. //  %[width]align

  12. //  width   - optional field width

  13. //  align   - l or r - specifies text alignment

  14.  

  15. String.prototype.formatLength = function (n,left) {

  16.     var str = "";

  17.     var i;

  18.     if (this.length < n) {

  19.         if (left) {

  20.             str += this;

  21.             for (i = 0; i < (n - this.length); i ++) str += " ";           

  22.         } else {

  23.             for (i = 0; i < (n - this.length); i ++) str += " ";

  24.             str += this;                       

  25.         }

  26.     } else {

  27.         if (left) {

  28.             str = this.slice(this.length-n-1,-1);   

  29.         } else {

  30.             str = this.slice(0,n-1);

  31.         }

  32.     }

  33.     return str;

  34. }

  35. String.prototype.format = function(arrArgs) {

  36.     var fmt = this;

  37.     var re = /(%d*[lr]{1})/gi;

  38.     var reNum = /d+/gi;

  39.     var fmtParts = fmt.split(re);

  40.     var fmtArgs = fmt.match(re);

  41.     var nP = 0, nA = 0,nAFirst = 0;

  42.     var str = "";

  43.     var fmtArgWidth;

  44.     var Width;

  45.     var strTemp;

  46.    

  47.     if (fmtParts == null) fmtParts = new Array();

  48.     if (fmtArgs == null) fmtArgs = new Array();   

  49.    

  50.     if (fmt.charAt(0) == "%") nAFirst = 1;

  51.     while (nP < fmtArgs.length || nA < fmtParts.length) {

  52.         if (nA < (nP + nAFirst)) {

  53.             if (nA < fmtArgs.length) {

  54.                  if (nA < arrArgs.length) {

  55.                     fmtArgWidth = fmtArgs[nA].match(reNum);

  56.                     if (fmtArgWidth != null) Width = new Number(fmtArgWidth[0]);

  57.                     else Width = 0;

  58.                     strTemp = new String(arrArgs[nA]);

  59.                     if (fmtArgs[nA].charAt(fmtArgs[nA].length - 1) == "l") {

  60.                         str += strTemp.formatLength(Width,true);

  61.                     } else {

  62.                         str += strTemp.formatLength(Width,false);                   

  63.                     }

  64.                  }

  65.             }

  66.             nA ++;

  67.         } else {

  68.             if (nP < fmtParts.length) {

  69.                 str += fmtParts[nP];

  70.             }

  71.             nP ++;

  72.         }

  73.     }

  74.     return str;

  75. }

  76.  

  77. // Helper functions - easy to use but a bit slower

  78. function sprintf(str) {

  79.         var arr = new Array();

  80.         for (i = 1; i < sprintf.arguments.length; i++) {

  81.                 arr[arr.length] = sprintf.arguments[i];

  82.         }

  83.         return str.format(arr);

  84. }

  85. // This one is for WSH only - remove it if gonna use the script in a different environment

  86. function printf(str) {

  87.         var arr = new Array();

  88.         for (i = 1; i < sprintf.arguments.length; i++) {

  89.                 arr[arr.length] = sprintf.arguments[i];

  90.         }

  91.     WScript.Echo(str.format(arr));

  92. }

  93.  
 
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  Date entered : 17th Feb 2001
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  Accessed  :  1129
  Submitted by :  micle
 
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