/*
 * jQuery corner plugin 1.98 (02-JUN-2009): simple corner rounding
 * Examples and documentation at: http://jquery.malsup.com/corner/
 */

;(function($) {

var expr = (function() {
	if (! $.browser.msie) return false;
	var div = document.createElement('div');
	try { div.style.setExpression('width','0+0'); }
	catch(e) { return false; }
	return true;
})();

function sz(el, p) {
	return parseInt($.css(el,p))||0;
};
function hex2(s) {
	var s = parseInt(s).toString(16);
	return ( s.length < 2 ) ? '0'+s : s;
};
function gpc(node) {
	for ( ; node && node.nodeName.toLowerCase() != 'html'; node = node.parentNode ) {
		var v = $.css(node,'backgroundColor');
		if (v == 'rgba(0, 0, 0, 0)')
			continue; // webkit
		if (v.indexOf('rgb') >= 0) {
			var rgb = v.match(/\d+/g);
			return '#'+ hex2(rgb[0]) + hex2(rgb[1]) + hex2(rgb[2]);
		}
		if ( v && v != 'transparent' )
			return v;
	}
	return '#ffffff';
};

function getWidth(fx, i, width) {
	switch(fx) {
	case 'round': return Math.round(width*(1-Math.cos(Math.asin(i/width))));
	case 'cool': return Math.round(width*(1+Math.cos(Math.asin(i/width))));
	case 'sharp': return Math.round(width*(1-Math.cos(Math.acos(i/width))));
	case 'bite': return Math.round(width*(Math.cos(Math.asin((width-i-1)/width))));
	case 'slide': return Math.round(width*(Math.atan2(i,width/i)));
	case 'jut': return Math.round(width*(Math.atan2(width,(width-i-1))));
	case 'curl': return Math.round(width*(Math.atan(i)));
	case 'tear': return Math.round(width*(Math.cos(i)));
	case 'wicked': return Math.round(width*(Math.tan(i)));
	case 'long': return Math.round(width*(Math.sqrt(i)));
	case 'sculpt': return Math.round(width*(Math.log((width-i-1),width)));
	case 'dog': return (i&1) ? (i+1) : width;
	case 'dog2': return (i&2) ? (i+1) : width;
	case 'dog3': return (i&3) ? (i+1) : width;
	case 'fray': return (i%2)*width;
	case 'notch': return width;
	case 'bevel': return i+1;
	}
};

$.fn.corner = function(o) {
	// in 1.3+ we can fix mistakes with the ready state
	if (this.length == 0) {
		if (!$.isReady && this.selector) {
			var s = this.selector, c = this.context;
			$(function() {
				$(s,c).corner(o);
			});
		}
		return this;
	}

	o = (o||"").toLowerCase();
	var keep = /keep/.test(o); // keep borders?
	var cc = ((o.match(/cc:(#[0-9a-f]+)/)||[])[1]); // corner color
	var sc = ((o.match(/sc:(#[0-9a-f]+)/)||[])[1]); // strip color
	var width = parseInt((o.match(/(\d+)px/)||[])[1]) || 10; // corner width
	var re = /round|bevel|notch|bite|cool|sharp|slide|jut|curl|tear|fray|wicked|sculpt|long|dog3|dog2|dog/;
	var fx = ((o.match(re)||['round'])[0]);
	var edges = { T:0, B:1 };
	var opts = {
		TL: /top|tl/.test(o), TR: /top|tr/.test(o),
		BL: /bottom|bl/.test(o), BR: /bottom|br/.test(o)
	};
	if ( !opts.TL && !opts.TR && !opts.BL && !opts.BR )
		opts = { TL:1, TR:1, BL:1, BR:1 };
	var strip = document.createElement('div');
	strip.style.overflow = 'hidden';
	strip.style.height = '1px';
	strip.style.backgroundColor = sc || 'transparent';
	strip.style.borderStyle = 'solid';
	return this.each(function(index){
		var pad = {
			T: parseInt($.css(this,'paddingTop'))||0, R: parseInt($.css(this,'paddingRight'))||0,
			B: parseInt($.css(this,'paddingBottom'))||0, L: parseInt($.css(this,'paddingLeft'))||0
		};

		if (typeof this.style.zoom != undefined) this.style.zoom = 1; // force 'hasLayout' in IE
		if (!keep) this.style.border = 'none';
		strip.style.borderColor = cc || gpc(this.parentNode);
		var cssHeight = $.curCSS(this, 'height');

		for (var j in edges) {
			var bot = edges[j];
			// only add stips if needed
			if ((bot && (opts.BL || opts.BR)) || (!bot && (opts.TL || opts.TR))) {
				strip.style.borderStyle = 'none '+(opts[j+'R']?'solid':'none')+' none '+(opts[j+'L']?'solid':'none');
				var d = document.createElement('div');
				$(d).addClass('jquery-corner');
				var ds = d.style;

				bot ? this.appendChild(d) : this.insertBefore(d, this.firstChild);

				if (bot && cssHeight != 'auto') {
					if ($.css(this,'position') == 'static')
							this.style.position = 'relative';
					ds.position = 'absolute';
					ds.bottom = ds.left = ds.padding = ds.margin = '0';
					if (expr)
							ds.setExpression('width', 'this.parentNode.offsetWidth');
					else
							ds.width = '100%';
				}
				else if (!bot && $.browser.msie) {
					if ($.css(this,'position') == 'static')
							this.style.position = 'relative';
					ds.position = 'absolute';
					ds.top = ds.left = ds.right = ds.padding = ds.margin = '0';

					// fix ie6 problem when blocked element has a border width
					if (expr) {
							var bw = sz(this,'borderLeftWidth') + sz(this,'borderRightWidth');
							ds.setExpression('width', 'this.parentNode.offsetWidth - '+bw+'+ "px"');
					}
					else
							ds.width = '100%';
				}
				else {
					ds.margin = !bot ? '-'+pad.T+'px -'+pad.R+'px '+(pad.T-width)+'px -'+pad.L+'px' : (pad.B-width)+'px -'+pad.R+'px -'+pad.B+'px -'+pad.L+'px';
				}

				for (var i=0; i < width; i++) {
					var w = Math.max(0,getWidth(fx,i, width));
					var e = strip.cloneNode(false);
					e.style.borderWidth = '0 '+(opts[j+'R']?w:0)+'px 0 '+(opts[j+'L']?w:0)+'px';
					bot ? d.appendChild(e) : d.insertBefore(e, d.firstChild);
				}
			}
		}
	});
};

$.fn.uncorner = function() {
	$('div.jquery-corner', this).remove();
	return this;
};

})(jQuery);