Calculate byte size of a text snippet

bytesize.js

/**

 * Calculate byte size of a text snippet

 * @author Lea Verou

 * MIT License

 */

(function(){

var crlf = /(\r?\n|\r)/g,

	whitespace = /(\r?\n|\r|\s+)/g;

window.ByteSize = {

	count: function(text, options) {

		// Set option defaults

		options = options || {};

		options.lineBreaks = options.lineBreaks || 1;

		options.ignoreWhitespace = options.ignoreWhitespace || false;

		

		var length = text.length,

			nonAscii = length - text.replace(/[\u0100-\uFFFF]/g, '').length,

		    lineBreaks = length - text.replace(crlf, '').length; 

		

		if (options.ignoreWhitespace) {

			// Strip whitespace

			text = text.replace(whitespace, '');

			

			return text.length + nonAscii;

		}

		else {

			return length + nonAscii + Math.max(0, options.lineBreaks * (lineBreaks - 1));

		}

	},

	

	format: function(count, plainText) {

		var level = 0;

		

		while (count > 1024) {

			count /= 1024;

			level++;

		}

	

		// Round to 2 decimals

		count = Math.round(count*100)/100;

	

		level = ['', 'K', 'M', 'G', 'T'][level];

	

		return (plainText? count : '<strong>' + count + '</strong>') + ' ' + level + 'B';

	}

};

})();