Adding OpenLayers.Number.format for string formatted numbers. Thanks for initiating this Andreas. Nice pairing with you. r=me (closes #1253)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@5686 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/BaseTypes.js

@@ -213,6 +213,19 @@ if (!String.prototype.camelize) {
  *********************/
 
 OpenLayers.Number = {
+
+    /**
+     * Property: OpenLayers.Number.decimalSeparator
+     * Decimal separator to use when formatting numbers.
+     */
+    decimalSeparator: ".",
+    
+    /**
+     * Property: OpenLayers.Number.thousandsSeparator
+     * Thousands separator to use when formatting numbers.
+     */
+    thousandsSeparator: ",",
+    
     /**
      * APIFunction: OpenLayers.Number.limitSigDigs
      * Limit the number of significant digits on a float.
@@ -231,6 +244,60 @@ OpenLayers.Number = {
             fig = parseFloat(num.toPrecision(sig));
         }
         return fig;
+    },
+    
+    /**
+     * APIFunction: OpenLayers.Number.format
+     * Formats a number for output.
+     * 
+     * Parameters:
+     * num  - {Float}
+     * dec  - {Integer} Number of decimal places to round to.
+     *        Defaults to 0. Set to null to leave decimal places unchanged.
+     * tsep - {String} Thousands separator.
+     *        Default is ",".
+     * dsep - {String} Decimal separator.
+     *        Default is ".".
+     *
+     * Returns:
+     * {String} A string representing the formatted number.
+     */
+    format: function(num, dec, tsep, dsep) {
+        dec = (typeof dec != "undefined") ? dec : 0; 
+        tsep = (typeof tsep != "undefined") ? tsep :
+            OpenLayers.Number.thousandsSeparator; 
+        dsep = (typeof dsep != "undefined") ? dsep :
+            OpenLayers.Number.decimalSeparator;
+
+        if (dec != null) {
+            num = parseFloat(num.toFixed(dec));
+        }
+
+        var parts = num.toString().split(".");
+        if (parts.length == 1 && dec == null) {
+            // integer where we do not want to touch the decimals
+            dec = 0;
+        }
+        
+        var integer = parts[0];
+        if (tsep) {
+            var thousands = /(-?[0-9]+)([0-9]{3})/; 
+            while(thousands.test(integer)) { 
+                integer = integer.replace(thousands, "$1" + tsep + "$2"); 
+            }
+        }
+        
+        var str;
+        if (dec == 0) {
+            str = integer;
+        } else {
+            var rem = parts.length > 1 ? parts[1] : "0";
+            if (dec != null) {
+                rem = rem + new Array(dec - rem.length + 1).join("0");
+            }
+            str = integer + dsep + rem;
+        }
+        return str;
     }
 };