/*

  SortTable

  version 2

  7th April 2007

  Stuart Langridge, http://www.kryogenix.org/code/browser/sorttable/

  Instructions:

  Download this file

  Add <script src="sorttable.js"></script> to your HTML

  Add class="sortable" to any table you'd like to make sortable

  Click on the headers to sort

  Thanks to many, many people for contributions and suggestions.

  Licenced as X11: http://www.kryogenix.org/code/browser/licence.html

  This basically means: do what you want with it.

*/

var stIsIE = /*@cc_on!@*/false;

sorttable = {

  init: function() {

    // quit if this function has already been called

    if (arguments.callee.done) return;

    // flag this function so we don't do the same thing twice

    arguments.callee.done = true;

    // kill the timer

    if (_timer) clearInterval(_timer);

    if (!document.createElement || !document.getElementsByTagName) return;

    sorttable.DATE_RE = /^(\d\d?)[\/\.-](\d\d?)[\/\.-]((\d\d)?\d\d)$/;

    forEach(document.getElementsByTagName('table'), function(table) {

      if (table.className.search(/\bsortable\b/) != -1) {

        sorttable.makeSortable(table);

      }

    });

  },

  makeSortable: function(table) {

    if (table.getElementsByTagName('thead').length == 0) {

      // table doesn't have a tHead. Since it should have, create one and

      // put the first table row in it.

      the = document.createElement('thead');

      the.appendChild(table.rows[0]);

      table.insertBefore(the,table.firstChild);

    }

    // Safari doesn't support table.tHead, sigh

    if (table.tHead == null) table.tHead = table.getElementsByTagName('thead')[0];

    if (table.tHead.rows.length != 1) return; // can't cope with two header rows

    // Sorttable v1 put rows with a class of "sortbottom" at the bottom (as

    // "total" rows, for example). This is B&R, since what you're supposed

    // to do is put them in a tfoot. So, if there are sortbottom rows,

    // for backwards compatibility, move them to tfoot (creating it if needed).

    sortbottomrows = [];

    for (var i=0; i<table.rows.length; i++) {

      if (table.rows[i].className.search(/\bsortbottom\b/) != -1) {

        sortbottomrows[sortbottomrows.length] = table.rows[i];

      }

    }

    if (sortbottomrows) {

      if (table.tFoot == null) {

        // table doesn't have a tfoot. Create one.

        tfo = document.createElement('tfoot');

        table.appendChild(tfo);

      }

      for (var i=0; i<sortbottomrows.length; i++) {

        tfo.appendChild(sortbottomrows[i]);

      }

      delete sortbottomrows;

    }

    // work through each column and calculate its type

    headrow = table.tHead.rows[0].cells;

    for (var i=0; i<headrow.length; i++) {

      // manually override the type with a sorttable_type attribute

      if (!headrow[i].className.match(/\bsorttable_nosort\b/)) { // skip this col

        mtch = headrow[i].className.match(/\bsorttable_([a-z0-9]+)\b/);

        if (mtch) { override = mtch[1]; }

	      if (mtch && typeof sorttable["sort_"+override] == 'function') {

	        headrow[i].sorttable_sortfunction = sorttable["sort_"+override];

	      } else {

	        headrow[i].sorttable_sortfunction = sorttable.guessType(table,i);

	      }

	      // make it clickable to sort

	      headrow[i].sorttable_columnindex = i;

	      headrow[i].sorttable_tbody = table.tBodies[0];

	      dean_addEvent(headrow[i],"click", function(e) {

          if (this.className.search(/\bsorttable_sorted\b/) != -1) {

            // if we're already sorted by this column, just 

            // reverse the table, which is quicker

            sorttable.reverse(this.sorttable_tbody);

            this.className = this.className.replace('sorttable_sorted',

                                                    'sorttable_sorted_reverse');

            this.removeChild(document.getElementById('sorttable_sortfwdind'));

            sortrevind = document.createElement('span');

            sortrevind.id = "sorttable_sortrevind";

            sortrevind.innerHTML = stIsIE ? '&nbsp<font face="webdings">5</font>' : '&nbsp;&#x25B4;';

            this.appendChild(sortrevind);

            return;

          }

          if (this.className.search(/\bsorttable_sorted_reverse\b/) != -1) {

            // if we're already sorted by this column in reverse, just 

            // re-reverse the table, which is quicker

            sorttable.reverse(this.sorttable_tbody);

            this.className = this.className.replace('sorttable_sorted_reverse',

                                                    'sorttable_sorted');

            this.removeChild(document.getElementById('sorttable_sortrevind'));

            sortfwdind = document.createElement('span');

            sortfwdind.id = "sorttable_sortfwdind";

            sortfwdind.innerHTML = stIsIE ? '&nbsp<font face="webdings">6</font>' : '&nbsp;&#x25BE;';

            this.appendChild(sortfwdind);

            return;

          }

          // remove sorttable_sorted classes

          theadrow = this.parentNode;

          forEach(theadrow.childNodes, function(cell) {

            if (cell.nodeType == 1) { // an element

              cell.className = cell.className.replace('sorttable_sorted_reverse','');

              cell.className = cell.className.replace('sorttable_sorted','');

            }

          });

          sortfwdind = document.getElementById('sorttable_sortfwdind');

          if (sortfwdind) { sortfwdind.parentNode.removeChild(sortfwdind); }

          sortrevind = document.getElementById('sorttable_sortrevind');

          if (sortrevind) { sortrevind.parentNode.removeChild(sortrevind); }

          this.className += ' sorttable_sorted';

          sortfwdind = document.createElement('span');

          sortfwdind.id = "sorttable_sortfwdind";

          sortfwdind.innerHTML = stIsIE ? '&nbsp<font face="webdings">6</font>' : '&nbsp;&#x25BE;';

          this.appendChild(sortfwdind);

	        // build an array to sort. This is a Schwartzian transform thing,

	        // i.e., we "decorate" each row with the actual sort key,

	        // sort based on the sort keys, and then put the rows back in order

	        // which is a lot faster because you only do getInnerText once per row

	        row_array = [];

	        col = this.sorttable_columnindex;

	        rows = this.sorttable_tbody.rows;

	        for (var j=0; j<rows.length; j++) {

	          row_array[row_array.length] = [sorttable.getInnerText(rows[j].cells[col]), rows[j]];

	        }

	        /* If you want a stable sort, uncomment the following line */

	        //sorttable.shaker_sort(row_array, this.sorttable_sortfunction);

	        /* and comment out this one */

	        row_array.sort(this.sorttable_sortfunction);

	        tb = this.sorttable_tbody;

	        for (var j=0; j<row_array.length; j++) {

	          tb.appendChild(row_array[j][1]);

	        }

	        delete row_array;

	      });

	    }

    }

  },

  guessType: function(table, column) {

    // guess the type of a column based on its first non-blank row

    sortfn = sorttable.sort_alpha;

    for (var i=0; i<table.tBodies[0].rows.length; i++) {

      text = sorttable.getInnerText(table.tBodies[0].rows[i].cells[column]);

      if (text != '') {

        if (text.match(/^-?[£$¤]?[\d,.]+%?$/)) {

          return sorttable.sort_numeric;

        }

        // check for a date: dd/mm/yyyy or dd/mm/yy 

        // can have / or . or - as separator

        // can be mm/dd as well

        possdate = text.match(sorttable.DATE_RE)

        if (possdate) {

          // looks like a date

          first = parseInt(possdate[1]);

          second = parseInt(possdate[2]);

          if (first > 12) {

            // definitely dd/mm

            return sorttable.sort_ddmm;

          } else if (second > 12) {

            return sorttable.sort_mmdd;

          } else {

            // looks like a date, but we can't tell which, so assume

            // that it's dd/mm (English imperialism!) and keep looking

            sortfn = sorttable.sort_ddmm;

          }

        }

      }

    }

    return sortfn;

  },

  getInnerText: function(node) {

    // gets the text we want to use for sorting for a cell.

    // strips leading and trailing whitespace.

    // this is *not* a generic getInnerText function; it's special to sorttable.

    // for example, you can override the cell text with a customkey attribute.

    // it also gets .value for <input> fields.

    hasInputs = (typeof node.getElementsByTagName == 'function') &&

                 node.getElementsByTagName('input').length;

    if (node.getAttribute("sorttable_customkey") != null) {

      return node.getAttribute("sorttable_customkey");

    }

    else if (typeof node.textContent != 'undefined' && !hasInputs) {

      return node.textContent.replace(/^\s+|\s+$/g, '');

    }

    else if (typeof node.innerText != 'undefined' && !hasInputs) {

      return node.innerText.replace(/^\s+|\s+$/g, '');

    }

    else if (typeof node.text != 'undefined' && !hasInputs) {

      return node.text.replace(/^\s+|\s+$/g, '');

    }

    else {

      switch (node.nodeType) {

        case 3:

          if (node.nodeName.toLowerCase() == 'input') {

            return node.value.replace(/^\s+|\s+$/g, '');

          }

        case 4:

          return node.nodeValue.replace(/^\s+|\s+$/g, '');

          break;

        case 1:

        case 11:

          var innerText = '';

          for (var i = 0; i < node.childNodes.length; i++) {

            innerText += sorttable.getInnerText(node.childNodes[i]);

          }

          return innerText.replace(/^\s+|\s+$/g, '');

          break;

        default:

          return '';

      }

    }

  },

  reverse: function(tbody) {

    // reverse the rows in a tbody

    newrows = [];

    for (var i=0; i<tbody.rows.length; i++) {

      newrows[newrows.length] = tbody.rows[i];

    }

    for (var i=newrows.length-1; i>=0; i--) {

       tbody.appendChild(newrows[i]);

    }

    delete newrows;

  },

  /* sort functions

     each sort function takes two parameters, a and b

     you are comparing a[0] and b[0] */

  sort_numeric: function(a,b) {

    aa = parseFloat(a[0].replace(/[^0-9.-]/g,''));

    if (isNaN(aa)) aa = 0;

    bb = parseFloat(b[0].replace(/[^0-9.-]/g,'')); 

    if (isNaN(bb)) bb = 0;

    return aa-bb;

  },

  sort_alpha: function(a,b) {

    if (a[0]==b[0]) return 0;

    if (a[0]<b[0]) return -1;

    return 1;

  },

  sort_ddmm: function(a,b) {

    mtch = a[0].match(sorttable.DATE_RE);

    y = mtch[3]; m = mtch[2]; d = mtch[1];

    if (m.length == 1) m = '0'+m;

    if (d.length == 1) d = '0'+d;

    dt1 = y+m+d;

    mtch = b[0].match(sorttable.DATE_RE);

    y = mtch[3]; m = mtch[2]; d = mtch[1];

    if (m.length == 1) m = '0'+m;

    if (d.length == 1) d = '0'+d;

    dt2 = y+m+d;

    if (dt1==dt2) return 0;

    if (dt1<dt2) return -1;

    return 1;

  },

  sort_mmdd: function(a,b) {

    mtch = a[0].match(sorttable.DATE_RE);

    y = mtch[3]; d = mtch[2]; m = mtch[1];

    if (m.length == 1) m = '0'+m;

    if (d.length == 1) d = '0'+d;

    dt1 = y+m+d;

    mtch = b[0].match(sorttable.DATE_RE);

    y = mtch[3]; d = mtch[2]; m = mtch[1];

    if (m.length == 1) m = '0'+m;

    if (d.length == 1) d = '0'+d;

    dt2 = y+m+d;

    if (dt1==dt2) return 0;

    if (dt1<dt2) return -1;

    return 1;

  },

  shaker_sort: function(list, comp_func) {

    // A stable sort function to allow multi-level sorting of data

    // see: http://en.wikipedia.org/wiki/Cocktail_sort

    // thanks to Joseph Nahmias

    var b = 0;

    var t = list.length - 1;

    var swap = true;

    while(swap) {

        swap = false;

        for(var i = b; i < t; ++i) {

            if ( comp_func(list[i], list[i+1]) > 0 ) {

                var q = list[i]; list[i] = list[i+1]; list[i+1] = q;

                swap = true;

            }

        } // for

        t--;

        if (!swap) break;

        for(var i = t; i > b; --i) {

            if ( comp_func(list[i], list[i-1]) < 0 ) {

                var q = list[i]; list[i] = list[i-1]; list[i-1] = q;

                swap = true;

            }

        } // for

        b++;

    } // while(swap)

  }  

}

/* ******************************************************************

   Supporting functions: bundled here to avoid depending on a library

   ****************************************************************** */

// Dean Edwards/Matthias Miller/John Resig

/* for Mozilla/Opera9 */

if (document.addEventListener) {

    document.addEventListener("DOMContentLoaded", sorttable.init, false);

}

/* for Internet Explorer */

/*@cc_on @*/

/*@if (@_win32)

    document.write("<script id=__ie_onload defer src=javascript:void(0)><\/script>");

    var script = document.getElementById("__ie_onload");

    script.onreadystatechange = function() {

        if (this.readyState == "complete") {

            sorttable.init(); // call the onload handler

        }

    };

/*@end @*/

/* for Safari */

if (/WebKit/i.test(navigator.userAgent)) { // sniff

    var _timer = setInterval(function() {

        if (/loaded|complete/.test(document.readyState)) {

            sorttable.init(); // call the onload handler

        }

    }, 10);

}

/* for other browsers */

window.onload = sorttable.init;

// written by Dean Edwards, 2005

// with input from Tino Zijdel, Matthias Miller, Diego Perini

// http://dean.edwards.name/weblog/2005/10/add-event/

function dean_addEvent(element, type, handler) {

	if (element.addEventListener) {

		element.addEventListener(type, handler, false);

	} else {

		// assign each event handler a unique ID

		if (!handler.$$guid) handler.$$guid = dean_addEvent.guid++;

		// create a hash table of event types for the element

		if (!element.events) element.events = {};

		// create a hash table of event handlers for each element/event pair

		var handlers = element.events[type];

		if (!handlers) {

			handlers = element.events[type] = {};

			// store the existing event handler (if there is one)

			if (element["on" + type]) {

				handlers[0] = element["on" + type];

			}

		}

		// store the event handler in the hash table

		handlers[handler.$$guid] = handler;

		// assign a global event handler to do all the work

		element["on" + type] = handleEvent;

	}

};

// a counter used to create unique IDs

dean_addEvent.guid = 1;

function removeEvent(element, type, handler) {

	if (element.removeEventListener) {

		element.removeEventListener(type, handler, false);

	} else {

		// delete the event handler from the hash table

		if (element.events && element.events[type]) {

			delete element.events[type][handler.$$guid];

		}

	}

};

function handleEvent(event) {

	var returnValue = true;

	// grab the event object (IE uses a global event object)

	event = event || fixEvent(((this.ownerDocument || this.document || this).parentWindow || window).event);

	// get a reference to the hash table of event handlers

	var handlers = this.events[event.type];

	// execute each event handler

	for (var i in handlers) {

		this.$$handleEvent = handlers[i];

		if (this.$$handleEvent(event) === false) {

			returnValue = false;

		}

	}

	return returnValue;

};

function fixEvent(event) {

	// add W3C standard event methods

	event.preventDefault = fixEvent.preventDefault;

	event.stopPropagation = fixEvent.stopPropagation;

	return event;

};

fixEvent.preventDefault = function() {

	this.returnValue = false;

};

fixEvent.stopPropagation = function() {

  this.cancelBubble = true;

}

// Dean's forEach: http://dean.edwards.name/base/forEach.js

/*

	forEach, version 1.0

	Copyright 2006, Dean Edwards

	License: http://www.opensource.org/licenses/mit-license.php

*/

// array-like enumeration

if (!Array.forEach) { // mozilla already supports this

	Array.forEach = function(array, block, context) {

		for (var i = 0; i < array.length; i++) {

			block.call(context, array[i], i, array);

		}

	};

}

// generic enumeration

Function.prototype.forEach = function(object, block, context) {

	for (var key in object) {

		if (typeof this.prototype[key] == "undefined") {

			block.call(context, object[key], key, object);

		}

	}

};

// character enumeration

String.forEach = function(string, block, context) {

	Array.forEach(string.split(""), function(chr, index) {

		block.call(context, chr, index, string);

	});

};

// globally resolve forEach enumeration

var forEach = function(object, block, context) {

	if (object) {

		var resolve = Object; // default

		if (object instanceof Function) {

			// functions have a "length" property

			resolve = Function;

		} else if (object.forEach instanceof Function) {

			// the object implements a custom forEach method so use that

			object.forEach(block, context);

			return;

		} else if (typeof object == "string") {

			// the object is a string

			resolve = String;

		} else if (typeof object.length == "number") {

			// the object is array-like

			resolve = Array;

		}

		resolve.forEach(object, block, context);

	}

};