[Pmplib-commits] SF.net SVN: pmplib: [37] trunk/lib/playlist

[<ny...@us...>]

Revision: 37
Author:   nyaochi
Date:     2006-06-03 18:30:52 -0700 (Sat, 03 Jun 2006)
ViewCVS:  http://svn.sourceforge.net/pmplib/?rev=37&view=rev

Log Message:
-----------
- Changed "lib/playlist/sample" folder to "lib/playlist/jspl".
- Added "playlist.js" to the folder.

Added Paths:
-----------
    trunk/lib/playlist/jspl/
    trunk/lib/playlist/jspl/playlist.js

Removed Paths:
-------------
    trunk/lib/playlist/sample/
Copied: trunk/lib/playlist/jspl (from rev 34, trunk/lib/playlist/sample)

Added: trunk/lib/playlist/jspl/playlist.js
===================================================================
--- trunk/lib/playlist/jspl/playlist.js	                        (rev 0)
+++ trunk/lib/playlist/jspl/playlist.js	2006-06-04 01:30:52 UTC (rev 37)
@@ -0,0 +1,68 @@
+/**
+ * Playlist class object.
+ */
+Playlist.prototype = new Array();
+
+function Playlist() {
+	/**
+	 * Order tracks in an arbitrary order specified by the arguments.
+	 *	This method sorts tracks in an arbitrary order by comparing field(s) in
+	 *	
+	 *	@param	[arguments]		Field name(s) used for sorting tracks.
+	 */
+	this.order = function()
+	{
+		// Extract field names for the comparison from the arguments.
+		var fields = arguments;
+
+		// Sort the elements by using an anonymous function for the comparison.
+		return this.sort(
+			function(x, y) {
+				var ret = 0;				// Comparison result.
+				// Loop over field names.
+				for (var i = 0;i < fields.length;++i) {
+					var coeff = 1;			// Sorting direction.
+					var field = fields[i];	// Field name for sorting.
+					if (field[0] == '-') {
+						coeff = -1;
+						field = field.slice(1);
+					} else {
+						coeff = +1;
+					}
+
+					// Compare field values of two objects, x and y.
+					ret = ((x[field])>(y[field]))-((x[field])<(y[field]));
+					// Inverse the result when descending sort.
+					ret *= coeff;
+
+					// Exit if the two values are not identical.
+					if (ret != 0) {
+						break;
+					}
+				}
+				// Return the comparison result.
+				return ret;
+			}
+		);
+	};
+
+	this.shuffle = function()
+	{
+		// Assign a random number for each track.
+		for (var i = 0;i < this.length;++i) {
+			this[i].order = Math.random();
+		}
+
+		// Arrange the tracks in a numerical order of the assigned numbers.
+		this.sort(
+			function(x, y) {
+				return ((x.order)>(y.order))-((x.order)<(y.order));
+			}
+		);
+
+		// Remove the assigned number from each track.
+		for (var i = 0;i < this.length;++i) {
+			delete this[i].order;
+		}
+	};
+}


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