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File: stylesheet.js
/**
 * @fileoverview Zapatec StyleSheet class definition. Used to manipulate with
 * style sheets.
 *
 * <pre>
 * Copyright (c) 2004-2006 by Zapatec, Inc.
 * http://www.zapatec.com
 * 1700 MLK Way, Berkeley, California,
 * 94709, U.S.A.
 * All rights reserved.
 * </pre>
 */

/* $Id: stylesheet.js 7323 2007-06-01 21:05:51Z alex $ */

if (typeof Zapatec == 'undefined') {
	/**
	 * @ignore Namespace definition.
	 */
	Zapatec = function() {};
}

/**
 * Zapatec StyleSheet class.
 *
 * <pre>
 * Important: Try not to have more than 30 style tags on the page because
 * http://support.microsoft.com/kb/262161
 *
 * When IE raises exception due to the limitation above, last style tag on the
 * page is used instead of creating new one. In this case use of
 * {@link Zapatec.StyleSheet#removeRules} is not recommended.
 * </pre>
 *
 * @constructor
 * @param {boolean} bUseLast Optional. If true, will try to find last style tag
 * and use it. Will create new style tag only if there are no styles on the page
 */
Zapatec.StyleSheet = function(bUseLast) {
	if (bUseLast) {
		// Use last style tag
		if (document.createStyleSheet) {
			// IE
			if (document.styleSheets.length) {
				this.styleSheet = document.styleSheets[document.styleSheets.length - 1];
			}
		} else {
			// Others
			var aStyleSheets = document.getElementsByTagName('style');
			if (aStyleSheets.length) {
				this.styleSheet = aStyleSheets[aStyleSheets.length - 1];
			}
/* Works properly only in Firefox
			if (document.styleSheets) {
				this.n = document.styleSheets.length - 1;
			}
*/
		}
	}
	if (!this.styleSheet) {
		if (document.createStyleSheet) {
			// IE
			try {
				this.styleSheet = document.createStyleSheet();
			} catch(oException) {
				// There is a limit of 30 style tags in Internet Explorer
				this.styleSheet = document.styleSheets[document.styleSheets.length - 1];
			};
		} else {
			// Others
			this.styleSheet = document.createElement('style');
			this.styleSheet.type = 'text/css';
			var oHead = document.getElementsByTagName('head')[0];
			// If there is no head tag on the page (Opera only)
			if (!oHead) {
				oHead = document.documentElement;
			}
			if (oHead) {
				oHead.appendChild(this.styleSheet);
			}
/* Works properly only in Firefox
			if (document.styleSheets) {
				this.n = document.styleSheets.length - 1;
			}
*/
		}
	}
};

/**
 * Adds a rule to the style sheet.
 *
 * @param {string} strSelector Rule selector
 * @param {string} strDeclarations Rule declarations
 */
Zapatec.StyleSheet.prototype.addRule = function(strSelector, strDeclarations) {
	if (!this.styleSheet) {
		// Object in not initialized properly
		return;
	}
	if (document.createStyleSheet) {
		// IE
/* Any unsupported selector in addRule crashes IE 6
		this.styleSheet.addRule(strSelector, strDeclarations);
*/
		this.styleSheet.cssText += strSelector + ' { ' + strDeclarations + ' }';
/* Works properly only in Firefox
	} else if (document.styleSheets) {
		// Firefox, Safari, Konqueror
		var objStyleSheet = document.styleSheets.item(this.n);
		objStyleSheet.insertRule(strSelector + ' { ' + strDeclarations + ' }',
		 objStyleSheet.cssRules.length);
*/
	} else {
		// Opera
		this.styleSheet.appendChild(
		 document.createTextNode(strSelector + ' { ' + strDeclarations + ' }')
		);
	}
};

/**
 * Removes all rules from the style sheet.
 */
Zapatec.StyleSheet.prototype.removeRules = function() {
	if (!this.styleSheet) {
		// Object in not initialized properly
		return;
	}
	if (document.createStyleSheet) {
		// IE
		var iRules = this.styleSheet.rules.length;
		for (var iRule = 0; iRule < iRules; iRule++) {
			this.styleSheet.removeRule();
		}
/* Works properly only in Firefox
	} else if (document.styleSheets) {
		// Firefox, Safari, Konqueror
		var objStyleSheet = document.styleSheets.item(this.n);
		var iRules = objStyleSheet.cssRules.length;
		for (var iRule = 0; iRule < iRules; iRule++) {
			objStyleSheet.deleteRule(0);
		}
*/
	} else {
		// Opera
		while (this.styleSheet.firstChild) {
			this.styleSheet.removeChild(this.styleSheet.firstChild);
		}
	}
};

/**
 * Parses a CSS string and adds rules into the style sheet.
 *
 * @param {string} strStyleSheet CSS string
 */
Zapatec.StyleSheet.prototype.addParse = function(strStyleSheet) {
	// Remove comments
	var arrClean = [];
	var arrTokens = strStyleSheet.split('/*');
	for (var iTok = 0; iTok < arrTokens.length; iTok++) {
		var arrTails = arrTokens[iTok].split('*/');
		arrClean.push(arrTails[arrTails.length - 1]);
	}
	strStyleSheet = arrClean.join('');
	// Remove at-rules
	strStyleSheet = strStyleSheet.replace(/@[^{]*;/g, '');
	// Split to styles
	var arrStyles = strStyleSheet.split('}');
	for (var iStl = 0; iStl < arrStyles.length; iStl++) {
		// Split to selector and declarations
		var arrRules = arrStyles[iStl].split('{');
		if (arrRules[0] && arrRules[1]) {
			// Split selector
			var arrSelectors = arrRules[0].split(',');
			for (var iSel = 0; iSel < arrSelectors.length; iSel++) {
				this.addRule(arrSelectors[iSel], arrRules[1]);
			}
		}
	}
};