/**
 * SyntaxHighlighter
 * http://alexgorbatchev.com/SyntaxHighlighter
 *
 * SyntaxHighlighter is donationware. If you are using it, please donate.
 * http://alexgorbatchev.com/SyntaxHighlighter/donate.html
 *
 * @version
 * 3.0.83 (July 02 2010)
 *
 * @copyright
 * Copyright (C) 2004-2010 Alex Gorbatchev.
 *
 * @license
 * Dual licensed under the MIT and GPL licenses.
 */
const SyntaxHighlighter = function () {

// CommonJS
	if (typeof (require) != 'undefined' && typeof (XRegExp) == 'undefined') {
		XRegExp = require('XRegExp').XRegExp;
	}

// Shortcut object which will be assigned to the SyntaxHighlighter variable.
// This is a shorthand for local reference in order to avoid long namespace
// references to SyntaxHighlighter.whatever...
	const sh = {
		defaults: {
			/** Additional CSS class names to be added to highlighter elements. */
			'class-name': '',

			/** First line number. */
			'first-line': 1,

			/**
			 * Pads line numbers. Possible values are:
			 *
			 *   false - don't pad line numbers.
			 *   true  - automaticaly pad numbers with minimum required number of leading zeroes.
			 *   [int] - length up to which pad line numbers.
			 */
			'pad-line-numbers': false,

			/** Lines to highlight. */
			'highlight': null,

			/** Title to be displayed above the code block. */
			'title': null,

			/** Enables or disables smart tabs. */
			'smart-tabs': true,

			/** Gets or sets tab size. */
			'tab-size': 4,

			/** Enables or disables gutter. */
			'gutter': true,

			/** Enables or disables toolbar. */
			'toolbar': true,

			/** Enables quick code copy and paste from double click. */
			'quick-code': true,

			/** Forces code view to be collapsed. */
			'collapse': false,

			/** Enables or disables automatic links. */
			'auto-links': true,

			/** Gets or sets light mode. Equavalent to turning off gutter and toolbar. */
			'light': false,

			'html-script': false
		},

		config: {
			space: '&nbsp;',

			/** Enables use of <SCRIPT type="syntaxhighlighter" /> tags. */
			useScriptTags: true,

			/** Blogger mode flag. */
			bloggerMode: false,

			stripBrs: false,

			/** Name of the tag that SyntaxHighlighter will automatically look for. */
			tagName: 'pre',

			strings: {
				expandSource: 'expand source',
				help: '?',
				alert: 'SyntaxHighlighter\n\n',
				noBrush: 'Can\'t find brush for: ',
				brushNotHtmlScript: 'Brush wasn\'t configured for html-script option: ',

				// this is populated by the build script
				aboutDialog: '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>About SyntaxHighlighter</title></head><body style="font-family:Geneva,Arial,Helvetica,sans-serif;background-color:#fff;color:#000;font-size:1em;text-align:center;"><div style="text-align:center;margin-top:1.5em;"><div style="font-size:xx-large;">SyntaxHighlighter</div><div style="font-size:.75em;margin-bottom:3em;"><div>version 3.0.83 (July 02 2010)</div><div><a href="http://alexgorbatchev.com/SyntaxHighlighter" target="_blank" style="color:#005896">http://alexgorbatchev.com/SyntaxHighlighter</a></div><div>JavaScript code syntax highlighter.</div><div>Copyright 2004-2010 Alex Gorbatchev.</div></div><div>If you like this script, please <a href="https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=2930402" style="color:#005896">donate</a> to <br/>keep development active!</div></div></body></html>'
			}
		},

		/** Internal 'global' variables. */
		vars: {
			discoveredBrushes: null,
			highlighters: {}
		},

		/** This object is populated by user included external brush files. */
		brushes: {},

		/** Common regular expressions. */
		regexLib: {
			multiLineCComments: /\/\*[\s\S]*?\*\//gm,
			singleLineCComments: /\/\/.*$/gm,
			singleLinePerlComments: /#.*$/gm,
			doubleQuotedString: /"([^\\"\n]|\\.)*"/g,
			singleQuotedString: /'([^\\'\n]|\\.)*'/g,
			multiLineDoubleQuotedString: new XRegExp('"([^\\\\"]|\\\\.)*"', 'gs'),
			multiLineSingleQuotedString: new XRegExp("'([^\\\\']|\\\\.)*'", 'gs'),
			xmlComments: /(&lt;|<)!--[\s\S]*?--(&gt;|>)/gm,
			url: /\w+:\/\/[\w-.\/?%&=:@;]*/g,

			/** <?= ?> tags. */
			phpScriptTags: {left: /(&lt;|<)\?=?/g, right: /\?(&gt;|>)/g},

			/** <%= %> tags. */
			aspScriptTags: {left: /(&lt;|<)%=?/g, right: /%(&gt;|>)/g},

			/** <script></script> tags. */
			scriptScriptTags: {left: /(&lt;|<)\s*script.*?(&gt;|>)/gi, right: /(&lt;|<)\/\s*script\s*(&gt;|>)/gi}
		},

		toolbar: {
			/**
			 * Generates HTML markup for the toolbar.
			 * @param {Highlighter} highlighter Highlighter instance.
			 * @return {String} Returns HTML markup.
			 */
			getHtml: function (highlighter) {
				let html = '<div class="toolbar">';
				const items = sh.toolbar.items,
					list = items.list
				;

				function defaultGetHtml(highlighter, name) {
					return sh.toolbar.getButtonHtml(highlighter, name, sh.config.strings[name]);
				};

				for (let i = 0; i < list.length; i++)
					html += (items[list[i]].getHtml || defaultGetHtml)(highlighter, list[i]);

				html += '</div>';

				return html;
			},

			/**
			 * Generates HTML markup for a regular button in the toolbar.
			 * @param {Highlighter} highlighter Highlighter instance.
			 * @param {String} commandName        Command name that would be executed.
			 * @param {String} label            Label text to display.
			 * @return {String}                    Returns HTML markup.
			 */
			getButtonHtml: function (highlighter, commandName, label) {
				return '<span><a href="#" class="toolbar_item'
					+ ' command_' + commandName
					+ ' ' + commandName
					+ '">' + label + '</a></span>'
					;
			},

			/**
			 * Event handler for a toolbar anchor.
			 */
			handler: function (e) {
				const target = e.target,
					className = target.className || ''
				;

				function getValue(name) {
					const r = new RegExp(name + '_(\\w+)'),
						match = r.exec(className)
					;

					return match ? match[1] : null;
				};

				const highlighter = getHighlighterById(findParentElement(target, '.syntaxhighlighter').id),
					commandName = getValue('command')
				;

				// execute the toolbar command
				if (highlighter && commandName)
					sh.toolbar.items[commandName].execute(highlighter);

				// disable default A click behaviour
				e.preventDefault();
			},

			/** Collection of toolbar items. */
			items: {
				// Ordered lis of items in the toolbar. Can't expect `for (var n in items)` to be consistent.
				list: ['expandSource', 'help'],

				expandSource: {
					getHtml: function (highlighter) {
						if (highlighter.getParam('collapse') != true)
							return '';

						const title = highlighter.getParam('title');
						return sh.toolbar.getButtonHtml(highlighter, 'expandSource', title ? title : sh.config.strings.expandSource);
					},

					execute: function (highlighter) {
						const div = getHighlighterDivById(highlighter.id);
						removeClass(div, 'collapsed');
					}
				},

				/** Command to display the about dialog window. */
				help: {
					execute: function (highlighter) {
						const wnd = popup('', '_blank', 500, 250, 'scrollbars=0'),
							doc = wnd.document
						;

						doc.write(sh.config.strings.aboutDialog);
						doc.close();
						wnd.focus();
					}
				}
			}
		},

		/**
		 * Finds all elements on the page which should be processes by SyntaxHighlighter.
		 *
		 * @param {Object} globalParams        Optional parameters which override element's
		 *                                    parameters. Only used if element is specified.
		 *
		 * @param {Object} element    Optional element to highlight. If none is
		 *                            provided, all elements in the current document
		 *                            are returned which qualify.
		 *
		 * @return {Array}    Returns list of <code>{ target: DOMElement, params: Object }</code> objects.
		 */
		findElements: function (globalParams, element) {
			let elements = element ? [element] : toArray(document.getElementsByTagName(sh.config.tagName));
			const conf = sh.config,
				result = []
			;

			// support for <SCRIPT TYPE="syntaxhighlighter" /> feature
			if (conf.useScriptTags)
				elements = elements.concat(getSyntaxHighlighterScriptTags());

			if (elements.length === 0)
				return result;

			for (let i = 0; i < elements.length; i++) {
				const item = {
					target: elements[i],
					// local params take precedence over globals
					params: merge(globalParams, parseParams(elements[i].className))
				};

				if (item.params['brush'] == null)
					continue;

				result.push(item);
			}

			return result;
		},

		/**
		 * Shorthand to highlight all elements on the page that are marked as
		 * SyntaxHighlighter source code.
		 *
		 * @param {Object} globalParams        Optional parameters which override element's
		 *                                    parameters. Only used if element is specified.
		 *
		 * @param {Object} element    Optional element to highlight. If none is
		 *                            provided, all elements in the current document
		 *                            are highlighted.
		 */
		highlight: function (globalParams, element) {
			const elements = this.findElements(globalParams, element),
				propertyName = 'innerHTML';
			let highlighter = null;
			const conf = sh.config
			;

			if (elements.length === 0)
				return;

			for (let i = 0; i < elements.length; i++) {
				var element = elements[i],
					target = element.target,
					params = element.params,
					brushName = params.brush,
					code
				;

				if (brushName == null)
					continue;

				// Instantiate a brush
				if (params['html-script'] == 'true' || sh.defaults['html-script'] == true) {
					highlighter = new sh.HtmlScript(brushName);
					brushName = 'htmlscript';
				} else {
					const brush = findBrush(brushName);

					if (brush)
						highlighter = new brush();
					else
						continue;
				}

				code = target[propertyName];

				// remove CDATA from <SCRIPT/> tags if it's present
				if (conf.useScriptTags)
					code = stripCData(code);

				// Inject title if the attribute is present
				if ((target.title || '') != '')
					params.title = target.title;

				params['brush'] = brushName;
				highlighter.init(params);
				element = highlighter.getDiv(code);

				// carry over ID
				if ((target.id || '') != '')
					element.id = target.id;

				target.parentNode.replaceChild(element, target);
			}
		},

		/**
		 * Main entry point for the SyntaxHighlighter.
		 * @param {Object} params Optional params to apply to all highlighted elements.
		 */
		all: function (params) {
			attachEvent(
				window,
				'load',
				function () {
					sh.highlight(params);
				}
			);
		}
	}; // end of sh

	sh['all'] = sh.all;
	sh['highlight'] = sh.highlight;

	/**
	 * Checks if target DOM elements has specified CSS class.
	 * @param {DOMElement} target Target DOM element to check.
	 * @param {String} className Name of the CSS class to check for.
	 * @return {Boolean} Returns true if class name is present, false otherwise.
	 */
	function hasClass(target, className) {
		return target.className.indexOf(className) != -1;
	};

	/**
	 * Adds CSS class name to the target DOM element.
	 * @param {DOMElement} target Target DOM element.
	 * @param {String} className New CSS class to add.
	 */
	function addClass(target, className) {
		if (!hasClass(target, className))
			target.className += ' ' + className;
	};

	/**
	 * Removes CSS class name from the target DOM element.
	 * @param {DOMElement} target Target DOM element.
	 * @param {String} className CSS class to remove.
	 */
	function removeClass(target, className) {
		target.className = target.className.replace(className, '');
	};

	/**
	 * Converts the source to array object. Mostly used for function arguments and
	 * lists returned by getElementsByTagName() which aren't Array objects.
	 * @param {List} source Source list.
	 * @return {Array} Returns array.
	 */
	function toArray(source) {
		const result = [];

		for (let i = 0; i < source.length; i++)
			result.push(source[i]);

		return result;
	};

	/**
	 * Splits block of text into lines.
	 * @param {String} block Block of text.
	 * @return {Array} Returns array of lines.
	 */
	function splitLines(block) {
		return block.split('\n');
	}

	/**
	 * Generates HTML ID for the highlighter.
	 * @param {String} highlighterId Highlighter ID.
	 * @return {String} Returns HTML ID.
	 */
	function getHighlighterId(id) {
		const prefix = 'highlighter_';
		return id.indexOf(prefix) == 0 ? id : prefix + id;
	};

	/**
	 * Finds Highlighter instance by ID.
	 * @param {String} highlighterId Highlighter ID.
	 * @return {Highlighter} Returns instance of the highlighter.
	 */
	function getHighlighterById(id) {
		return sh.vars.highlighters[getHighlighterId(id)];
	};

	/**
	 * Finds highlighter's DIV container.
	 * @param {String} highlighterId Highlighter ID.
	 * @return {Element} Returns highlighter's DIV element.
	 */
	function getHighlighterDivById(id) {
		return document.getElementById(getHighlighterId(id));
	};

	/**
	 * Stores highlighter so that getHighlighterById() can do its thing. Each
	 * highlighter must call this method to preserve itself.
	 * @param {Highilghter} highlighter Highlighter instance.
	 */
	function storeHighlighter(highlighter) {
		sh.vars.highlighters[getHighlighterId(highlighter.id)] = highlighter;
	};

	/**
	 * Looks for a child or parent node which has specified classname.
	 * Equivalent to jQuery's $(container).find(".className")
	 * @param {Element} target Target element.
	 * @param {String} search Class name or node name to look for.
	 * @param {Boolean} reverse If set to true, will go up the node tree instead of down.
	 * @return {Element} Returns found child or parent element on null.
	 */
	function findElement(target, search, reverse /* optional */) {
		if (target == null)
			return null;

		const nodes = reverse != true ? target.childNodes : [target.parentNode],
			propertyToFind = {'#': 'id', '.': 'className'}[search.substr(0, 1)] || 'nodeName';
		let expectedValue,
			found
		;

		expectedValue = propertyToFind != 'nodeName'
			? search.substr(1)
			: search.toUpperCase()
		;

		// main return of the found node
		if ((target[propertyToFind] || '').indexOf(expectedValue) != -1)
			return target;

		for (let i = 0; nodes && i < nodes.length && found == null; i++)
			found = findElement(nodes[i], search, reverse);

		return found;
	};

	/**
	 * Looks for a parent node which has specified classname.
	 * This is an alias to <code>findElement(container, className, true)</code>.
	 * @param {Element} target Target element.
	 * @param {String} className Class name to look for.
	 * @return {Element} Returns found parent element on null.
	 */
	function findParentElement(target, className) {
		return findElement(target, className, true);
	};

	/**
	 * Finds an index of element in the array.
	 * @ignore
	 * @param {Object} searchElement
	 * @param {Number} fromIndex
	 * @return {Number} Returns index of element if found; -1 otherwise.
	 */
	function indexOf(array, searchElement, fromIndex) {
		fromIndex = Math.max(fromIndex || 0, 0);

		for (let i = fromIndex; i < array.length; i++)
			if (array[i] == searchElement)
				return i;

		return -1;
	};

	/**
	 * Generates a unique element ID.
	 */
	function guid(prefix) {
		return (prefix || '') + Math.round(Math.random() * 1000000).toString();
	};

	/**
	 * Merges two objects. Values from obj2 override values in obj1.
	 * Function is NOT recursive and works only for one dimensional objects.
	 * @param {Object} obj1 First object.
	 * @param {Object} obj2 Second object.
	 * @return {Object} Returns combination of both objects.
	 */
	function merge(obj1, obj2) {
		const result = {};
		let name;

		for (name in obj1)
			result[name] = obj1[name];

		for (name in obj2)
			result[name] = obj2[name];

		return result;
	};

	/**
	 * Attempts to convert string to boolean.
	 * @param {String} value Input string.
	 * @return {Boolean} Returns true if input was "true", false if input was "false" and value otherwise.
	 */
	function toBoolean(value) {
		const result = {"true": true, "false": false}[value];
		return result == null ? value : result;
	};

	/**
	 * Opens up a centered popup window.
	 * @param {String} url        URL to open in the window.
	 * @param {String} name        Popup name.
	 * @param {int} width        Popup width.
	 * @param {int} height        Popup height.
	 * @param {String} options    window.open() options.
	 * @return {Window}            Returns window instance.
	 */
	function popup(url, name, width, height, options) {
		const x = (screen.width - width) / 2,
			y = (screen.height - height) / 2
		;

		options += ', left=' + x +
			', top=' + y +
			', width=' + width +
			', height=' + height
		;
		options = options.replace(/^,/, '');

		const win = window.open(url, name, options);
		win.focus();
		return win;
	};

	/**
	 * Adds event handler to the target object.
	 * @param {Object} obj        Target object.
	 * @param {String} type        Name of the event.
	 * @param {Function} func    Handling function.
	 */
	function attachEvent(obj, type, func, scope) {
		function handler(e) {
			e = e || window.event;

			if (!e.target) {
				e.target = e.srcElement;
				e.preventDefault = function () {
					this.returnValue = false;
				};
			}

			func.call(scope || window, e);
		};

		if (obj.attachEvent) {
			obj.attachEvent('on' + type, handler);
		} else {
			obj.addEventListener(type, handler, false);
		}
	};

	/**
	 * Displays an alert.
	 * @param {String} str String to display.
	 */
	function alert(str) {
		window.alert(sh.config.strings.alert + str);
	};

	/**
	 * Finds a brush by its alias.
	 *
	 * @param {String} alias        Brush alias.
	 * @param {Boolean} showAlert    Suppresses the alert if false.
	 * @return {Brush}                Returns bursh constructor if found, null otherwise.
	 */
	function findBrush(alias, showAlert) {
		let brushes = sh.vars.discoveredBrushes,
			result = null
		;

		if (brushes == null) {
			brushes = {};

			// Find all brushes
			for (let brush in sh.brushes) {
				const info = sh.brushes[brush],
					aliases = info.aliases
				;

				if (aliases == null)
					continue;

				// keep the brush name
				info.brushName = brush.toLowerCase();

				for (let i = 0; i < aliases.length; i++)
					brushes[aliases[i]] = brush;
			}

			sh.vars.discoveredBrushes = brushes;
		}

		result = sh.brushes[brushes[alias]];

		if (result == null && showAlert != false)
			alert(sh.config.strings.noBrush + alias);

		return result;
	};

	/**
	 * Executes a callback on each line and replaces each line with result from the callback.
	 * @param {Object} str            Input string.
	 * @param {Object} callback        Callback function taking one string argument and returning a string.
	 */
	function eachLine(str, callback) {
		const lines = splitLines(str);

		for (let i = 0; i < lines.length; i++)
			lines[i] = callback(lines[i], i);

		return lines.join('\n');
	};

	/**
	 * This is a special trim which only removes first and last empty lines
	 * and doesn't affect valid leading space on the first line.
	 *
	 * @param {String} str   Input string
	 * @return {String}      Returns string without empty first and last lines.
	 */
	function trimFirstAndLastLines(str) {
		return str.replace(/^[ ]*[\n]+|[\n]*[ ]*$/g, '');
	};

	/**
	 * Parses key/value pairs into hash object.
	 *
	 * Understands the following formats:
	 * - name: word;
	 * - name: [word, word];
	 * - name: "string";
	 * - name: 'string';
	 *
	 * For example:
	 *   name1: value; name2: [value, value]; name3: 'value'
	 *
	 * @param {String} str    Input string.
	 * @return {Object}       Returns deserialized object.
	 */
	function parseParams(str) {
		let match;
		const result = {},
			arrayRegex = new XRegExp("^\\[(?<values>(.*?))\\]$"),
			regex = new XRegExp(
				"(?<name>[\\w-]+)" +
				"\\s*:\\s*" +
				"(?<value>" +
				"[\\w-%#]+|" +		// word
				"\\[.*?\\]|" +		// [] array
				'".*?"|' +			// "" string
				"'.*?'" +			// '' string
				")\\s*;?",
				"g"
			)
		;

		while ((match = regex.exec(str)) != null) {
			let value = match.value
				.replace(/^['"]|['"]$/g, '') // strip quotes from end of strings
			;

			// try to parse array value
			if (value != null && arrayRegex.test(value)) {
				const m = arrayRegex.exec(value);
				value = m.values.length > 0 ? m.values.split(/\s*,\s*/) : [];
			}

			result[match.name] = value;
		}

		return result;
	};

	/**
	 * Wraps each line of the string into <code/> tag with given style applied to it.
	 *
	 * @param {String} str   Input string.
	 * @param {String} css   Style name to apply to the string.
	 * @return {String}      Returns input string with each line surrounded by <span/> tag.
	 */
	function wrapLinesWithCode(str, css) {
		if (str == null || str.length == 0 || str == '\n')
			return str;

		str = str.replace(/</g, '&lt;');

		// Replace two or more sequential spaces with &nbsp; leaving last space untouched.
		str = str.replace(/ {2,}/g, function (m) {
			let spaces = '';

			for (let i = 0; i < m.length - 1; i++)
				spaces += sh.config.space;

			return spaces + ' ';
		});

		// Split each line and apply <span class="...">...</span> to them so that
		// leading spaces aren't included.
		if (css != null)
			str = eachLine(str, function (line) {
				if (line.length == 0)
					return '';

				let spaces = '';

				line = line.replace(/^(&nbsp;| )+/, function (s) {
					spaces = s;
					return '';
				});

				if (line.length == 0)
					return spaces;

				return spaces + '<code class="' + css + '">' + line + '</code>';
			});

		return str;
	};

	/**
	 * Pads number with zeros until it's length is the same as given length.
	 *
	 * @param {Number} number    Number to pad.
	 * @param {Number} length    Max string length with.
	 * @return {String}            Returns a string padded with proper amount of '0'.
	 */
	function padNumber(number, length) {
		let result = number.toString();

		while (result.length < length)
			result = '0' + result;

		return result;
	};

	/**
	 * Replaces tabs with spaces.
	 *
	 * @param {String} code        Source code.
	 * @param {Number} tabSize    Size of the tab.
	 * @return {String}            Returns code with all tabs replaces by spaces.
	 */
	function processTabs(code, tabSize) {
		let tab = '';

		for (let i = 0; i < tabSize; i++)
			tab += ' ';

		return code.replace(/\t/g, tab);
	};

	/**
	 * Replaces tabs with smart spaces.
	 *
	 * @param {String} code    Code to fix the tabs in.
	 * @param {Number} tabSize Number of spaces in a column.
	 * @return {String}        Returns code with all tabs replaces with roper amount of spaces.
	 */
	function processSmartTabs(code, tabSize) {
		const lines = splitLines(code),
			tab = '\t';
		let spaces = ''
		;

		// Create a string with 1000 spaces to copy spaces from...
		// It's assumed that there would be no indentation longer than that.
		for (let i = 0; i < 50; i++)
			spaces += '                    '; // 20 spaces * 50

		// This function inserts specified amount of spaces in the string
		// where a tab is while removing that given tab.
		function insertSpaces(line, pos, count) {
			return line.substr(0, pos)
				+ spaces.substr(0, count)
				+ line.substr(pos + 1, line.length) // pos + 1 will get rid of the tab
				;
		};

		// Go through all the lines and do the 'smart tabs' magic.
		code = eachLine(code, function (line) {
			if (line.indexOf(tab) == -1)
				return line;

			let pos = 0;

			while ((pos = line.indexOf(tab)) != -1) {
				// This is pretty much all there is to the 'smart tabs' logic.
				// Based on the position within the line and size of a tab,
				// calculate the amount of spaces we need to insert.
				const spaces = tabSize - pos % tabSize;
				line = insertSpaces(line, pos, spaces);
			}

			return line;
		});

		return code;
	};

	/**
	 * Performs various string fixes based on configuration.
	 */
	function fixInputString(str) {
		const br = /<br\s*\/?>|&lt;br\s*\/?&gt;/gi;

		if (sh.config.bloggerMode == true)
			str = str.replace(br, '\n');

		if (sh.config.stripBrs == true)
			str = str.replace(br, '');

		return str;
	};

	/**
	 * Removes all white space at the begining and end of a string.
	 *
	 * @param {String} str   String to trim.
	 * @return {String}      Returns string without leading and following white space characters.
	 */
	function trim(str) {
		return str.replace(/^\s+|\s+$/g, '');
	};

	/**
	 * Unindents a block of text by the lowest common indent amount.
	 * @param {String} str   Text to unindent.
	 * @return {String}      Returns unindented text block.
	 */
	function unindent(str) {
		const lines = splitLines(fixInputString(str)),
			indents = new Array(),
			regex = /^\s*/;
		let min = 1000
		;

		// go through every line and check for common number of indents
		for (var i = 0; i < lines.length && min > 0; i++) {
			const line = lines[i];

			if (trim(line).length == 0)
				continue;

			const matches = regex.exec(line);

			// In the event that just one line doesn't have leading white space
			// we can't unindent anything, so bail completely.
			if (matches == null)
				return str;

			min = Math.min(matches[0].length, min);
		}

		// trim minimum common number of white space from the begining of every line
		if (min > 0)
			for (var i = 0; i < lines.length; i++)
				lines[i] = lines[i].substr(min);

		return lines.join('\n');
	};

	/**
	 * Callback method for Array.sort() which sorts matches by
	 * index position and then by length.
	 *
	 * @param {Match} m1    Left object.
	 * @param {Match} m2    Right object.
	 * @return {Number}     Returns -1, 0 or -1 as a comparison result.
	 */
	function matchesSortCallback(m1, m2) {
		// sort matches by index first
		if (m1.index < m2.index)
			return -1;
		else if (m1.index > m2.index)
			return 1;
		else {
			// if index is the same, sort by length
			if (m1.length < m2.length)
				return -1;
			else if (m1.length > m2.length)
				return 1;
		}

		return 0;
	};

	/**
	 * Executes given regular expression on provided code and returns all
	 * matches that are found.
	 *
	 * @param {String} code    Code to execute regular expression on.
	 * @param {Object} regex   Regular expression item info from <code>regexList</code> collection.
	 * @return {Array}         Returns a list of Match objects.
	 */
	function getMatches(code, regexInfo) {
		function defaultAdd(match, regexInfo) {
			return match[0];
		};

		var index = 0,
			match = null,
			matches = [],
			func = regexInfo.func ? regexInfo.func : defaultAdd
		;

		while ((match = regexInfo.regex.exec(code)) != null) {
			let resultMatch = func(match, regexInfo);

			if (typeof (resultMatch) == 'string')
				resultMatch = [new sh.Match(resultMatch, match.index, regexInfo.css)];

			matches = matches.concat(resultMatch);
		}

		return matches;
	};

	/**
	 * Turns all URLs in the code into <a/> tags.
	 * @param {String} code Input code.
	 * @return {String} Returns code with </a> tags.
	 */
	function processUrls(code) {
		const gt = /(.*)((&gt;|&lt;).*)/;

		return code.replace(sh.regexLib.url, function (m) {
			let suffix = '';
			const match = null
			;

			// We include &lt; and &gt; in the URL for the common cases like <http://google.com>
			// The problem is that they get transformed into &lt;http://google.com&gt;
			// Where as &gt; easily looks like part of the URL string.

			if (match == gt.exec(m)) {
				m = match[1];
				suffix = match[2];
			}

			return '<a href="' + m + '">' + m + '</a>' + suffix;
		});
	};

	/**
	 * Finds all <SCRIPT TYPE="syntaxhighlighter" /> elementss.
	 * @return {Array} Returns array of all found SyntaxHighlighter tags.
	 */
	function getSyntaxHighlighterScriptTags() {
		const tags = document.getElementsByTagName('script'),
			result = []
		;

		for (let i = 0; i < tags.length; i++)
			if (tags[i].type == 'syntaxhighlighter')
				result.push(tags[i]);

		return result;
	};

	/**
	 * Strips <![CDATA[]]> from <SCRIPT /> content because it should be used
	 * there in most cases for XHTML compliance.
	 * @param {String} original    Input code.
	 * @return {String} Returns code without leading <![CDATA[]]> tags.
	 */
	function stripCData(original) {
		const left = '<![CDATA[',
			right = ']]>';
		let // for some reason IE inserts some leading blanks here
			copy = trim(original),
			changed = false;
		const leftLength = left.length,
			rightLength = right.length
		;

		if (copy.indexOf(left) == 0) {
			copy = copy.substring(leftLength);
			changed = true;
		}

		const copyLength = copy.length;

		if (copy.indexOf(right) == copyLength - rightLength) {
			copy = copy.substring(0, copyLength - rightLength);
			changed = true;
		}

		return changed ? copy : original;
	};


	/**
	 * Quick code mouse double click handler.
	 */
	function quickCodeHandler(e) {
		const target = e.target,
			highlighterDiv = findParentElement(target, '.syntaxhighlighter'),
			container = findParentElement(target, '.container'),
			textarea = document.createElement('textarea');
		let highlighter
		;

		if (!container || !highlighterDiv || findElement(container, 'textarea'))
			return;

		highlighter = getHighlighterById(highlighterDiv.id);

		// add source class name
		addClass(highlighterDiv, 'source');

		// Have to go over each line and grab it's text, can't just do it on the
		// container because Firefox loses all \n where as Webkit doesn't.
		const lines = container.childNodes;
		let code = []
		;

		for (let i = 0; i < lines.length; i++)
			code.push(lines[i].innerText || lines[i].textContent);

		// using \r instead of \r or \r\n makes this work equally well on IE, FF and Webkit
		code = code.join('\r');

		// inject <textarea/> tag
		textarea.appendChild(document.createTextNode(code));
		container.appendChild(textarea);

		// preselect all text
		textarea.focus();
		textarea.select();

		// set up handler for lost focus
		attachEvent(textarea, 'blur', function (e) {
			textarea.parentNode.removeChild(textarea);
			removeClass(highlighterDiv, 'source');
		});
	};

	/**
	 * Match object.
	 */
	sh.Match = function (value, index, css) {
		this.value = value;
		this.index = index;
		this.length = value.length;
		this.css = css;
		this.brushName = null;
	};

	sh.Match.prototype.toString = function () {
		return this.value;
	};

	/**
	 * Simulates HTML code with a scripting language embedded.
	 *
	 * @param {String} scriptBrushName Brush name of the scripting language.
	 */
	sh.HtmlScript = function (scriptBrushName) {
		const brushClass = findBrush(scriptBrushName);
		let scriptBrush;
		const xmlBrush = new sh.brushes.Xml(),
			bracketsRegex = null,
			ref = this,
			methodsToExpose = 'getDiv getHtml init'.split(' ')
		;

		if (brushClass == null)
			return;

		scriptBrush = new brushClass();

		for (var i = 0; i < methodsToExpose.length; i++)
			// make a closure so we don't lose the name after i changes
			(function () {
				const name = methodsToExpose[i];

				ref[name] = function () {
					return xmlBrush[name].apply(xmlBrush, arguments);
				};
			})();

		if (scriptBrush.htmlScript == null) {
			alert(sh.config.strings.brushNotHtmlScript + scriptBrushName);
			return;
		}

		xmlBrush.regexList.push(
			{regex: scriptBrush.htmlScript.code, func: process}
		);

		function offsetMatches(matches, offset) {
			for (let j = 0; j < matches.length; j++)
				matches[j].index += offset;
		}

		function process(match, info) {
			const code = match.code;
			let matches = [];
			const regexList = scriptBrush.regexList,
				offset = match.index + match.left.length,
				htmlScript = scriptBrush.htmlScript;
			let result
			;

			// add all matches from the code
			for (let i = 0; i < regexList.length; i++) {
				result = getMatches(code, regexList[i]);
				offsetMatches(result, offset);
				matches = matches.concat(result);
			}

			// add left script bracket
			if (htmlScript.left != null && match.left != null) {
				result = getMatches(match.left, htmlScript.left);
				offsetMatches(result, match.index);
				matches = matches.concat(result);
			}

			// add right script bracket
			if (htmlScript.right != null && match.right != null) {
				result = getMatches(match.right, htmlScript.right);
				offsetMatches(result, match.index + match[0].lastIndexOf(match.right));
				matches = matches.concat(result);
			}

			for (let j = 0; j < matches.length; j++)
				matches[j].brushName = brushClass.brushName;

			return matches;
		}
	};

	/**
	 * Main Highlither class.
	 * @constructor
	 */
	sh.Highlighter = function () {
		// not putting any code in here because of the prototype inheritance
	};

	sh.Highlighter.prototype = {
		/**
		 * Returns value of the parameter passed to the highlighter.
		 * @param {String} name                Name of the parameter.
		 * @param {Object} defaultValue        Default value.
		 * @return {Object}                    Returns found value or default value otherwise.
		 */
		getParam: function (name, defaultValue) {
			const result = this.params[name];
			return toBoolean(result == null ? defaultValue : result);
		},

		/**
		 * Shortcut to document.createElement().
		 * @param {String} name        Name of the element to create (DIV, A, etc).
		 * @return {HTMLElement}    Returns new HTML element.
		 */
		create: function (name) {
			return document.createElement(name);
		},

		/**
		 * Applies all regular expression to the code and stores all found
		 * matches in the `this.matches` array.
		 * @param {Array} regexList        List of regular expressions.
		 * @param {String} code            Source code.
		 * @return {Array}                Returns list of matches.
		 */
		findMatches: function (regexList, code) {
			let result = [];

			if (regexList != null)
				for (let i = 0; i < regexList.length; i++)
					// BUG: length returns len+1 for array if methods added to prototype chain (oising@gmail.com)
					if (typeof (regexList[i]) == "object")
						result = result.concat(getMatches(code, regexList[i]));

			// sort and remove nested the matches
			return this.removeNestedMatches(result.sort(matchesSortCallback));
		},

		/**
		 * Checks to see if any of the matches are inside of other matches.
		 * This process would get rid of highligted strings inside comments,
		 * keywords inside strings and so on.
		 */
		removeNestedMatches: function (matches) {
			// Optimized by Jose Prado (http://joseprado.com)
			for (let i = 0; i < matches.length; i++) {
				if (matches[i] === null)
					continue;

				const itemI = matches[i],
					itemIEndPos = itemI.index + itemI.length
				;

				for (let j = i + 1; j < matches.length && matches[i] !== null; j++) {
					const itemJ = matches[j];

					if (itemJ === null)
						continue;
					else if (itemJ.index > itemIEndPos)
						break;
					else if (itemJ.index == itemI.index && itemJ.length > itemI.length)
						matches[i] = null;
					else if (itemJ.index >= itemI.index && itemJ.index < itemIEndPos)
						matches[j] = null;
				}
			}

			return matches;
		},

		/**
		 * Creates an array containing integer line numbers starting from the 'first-line' param.
		 * @return {Array} Returns array of integers.
		 */
		figureOutLineNumbers: function (code) {
			const lines = [],
				firstLine = parseInt(this.getParam('first-line'))
			;

			eachLine(code, function (line, index) {
				lines.push(index + firstLine);
			});

			return lines;
		},

		/**
		 * Determines if specified line number is in the highlighted list.
		 */
		isLineHighlighted: function (lineNumber) {
			let list = this.getParam('highlight', []);

			if (typeof (list) != 'object' && list.push == null)
				list = [list];

			return indexOf(list, lineNumber.toString()) != -1;
		},

		/**
		 * Generates HTML markup for a single line of code while determining alternating line style.
		 * @param {Integer} lineNumber    Line number.
		 * @param {String} code Line    HTML markup.
		 * @return {String}                Returns HTML markup.
		 */
		getLineHtml: function (lineIndex, lineNumber, code) {
			const classes = [
				'line',
				'number' + lineNumber,
				'index' + lineIndex,
				'alt' + (lineNumber % 2 == 0 ? 1 : 2).toString()
			];

			if (this.isLineHighlighted(lineNumber))
				classes.push('highlighted');

			if (lineNumber == 0)
				classes.push('break');

			return '<div class="' + classes.join(' ') + '">' + code + '</div>';
		},

		/**
		 * Generates HTML markup for line number column.
		 * @param {String} code            Complete code HTML markup.
		 * @param {Array} lineNumbers    Calculated line numbers.
		 * @return {String}                Returns HTML markup.
		 */
		getLineNumbersHtml: function (code, lineNumbers) {
			let html = '';
			const count = splitLines(code).length,
				firstLine = parseInt(this.getParam('first-line'));
			let pad = this.getParam('pad-line-numbers')
			;

			if (pad == true)
				pad = (firstLine + count - 1).toString().length;
			else if (isNaN(pad) == true)
				pad = 0;

			for (let i = 0; i < count; i++) {
				var lineNumber = lineNumbers ? lineNumbers[i] : firstLine + i,
					code = lineNumber == 0 ? sh.config.space : padNumber(lineNumber, pad)
				;

				html += this.getLineHtml(i, lineNumber, code);
			}

			return html;
		},

		/**
		 * Splits block of text into individual DIV lines.
		 * @param {String} code            Code to highlight.
		 * @param {Array} lineNumbers    Calculated line numbers.
		 * @return {String}                Returns highlighted code in HTML form.
		 */
		getCodeLinesHtml: function (html, lineNumbers) {
			html = trim(html);

			var lines = splitLines(html),
				padLength = this.getParam('pad-line-numbers'),
				firstLine = parseInt(this.getParam('first-line')),
				html = '',
				brushName = this.getParam('brush')
			;

			for (let i = 0; i < lines.length; i++) {
				let line = lines[i];
				const indent = /^(&nbsp;|\s)+/.exec(line);
				let spaces = null;
				const lineNumber = lineNumbers ? lineNumbers[i] : firstLine + i;
				;

				if (indent != null) {
					spaces = indent[0].toString();
					line = line.substr(spaces.length);
					spaces = spaces.replace(' ', sh.config.space);
				}

				line = trim(line);

				if (line.length == 0)
					line = sh.config.space;

				html += this.getLineHtml(
					i,
					lineNumber,
					(spaces != null ? '<code class="' + brushName + ' spaces">' + spaces + '</code>' : '') + line
				);
			}

			return html;
		},

		/**
		 * Returns HTML for the table title or empty string if title is null.
		 */
		getTitleHtml: function (title) {
			return title ? '<caption>' + title + '</caption>' : '';
		},

		/**
		 * Finds all matches in the source code.
		 * @param {String} code        Source code to process matches in.
		 * @param {Array} matches    Discovered regex matches.
		 * @return {String} Returns formatted HTML with processed mathes.
		 */
		getMatchesHtml: function (code, matches) {
			let pos = 0,
				result = '';
			const brushName = this.getParam('brush', '')
			;

			function getBrushNameCss(match) {
				const result = match ? (match.brushName || brushName) : brushName;
				return result ? result + ' ' : '';
			};

			// Finally, go through the final list of matches and pull the all
			// together adding everything in between that isn't a match.
			for (let i = 0; i < matches.length; i++) {
				var match = matches[i],
					matchBrushName
				;

				if (match === null || match.length === 0)
					continue;

				matchBrushName = getBrushNameCss(match);

				result += wrapLinesWithCode(code.substr(pos, match.index - pos), matchBrushName + 'plain')
					+ wrapLinesWithCode(match.value, matchBrushName + match.css)
				;

				pos = match.index + match.length + (match.offset || 0);
			}

			// don't forget to add whatever's remaining in the string
			result += wrapLinesWithCode(code.substr(pos), getBrushNameCss() + 'plain');

			return result;
		},

		/**
		 * Generates HTML markup for the whole syntax highlighter.
		 * @param {String} code Source code.
		 * @return {String} Returns HTML markup.
		 */
		getHtml: function (code) {
			let html = '';
			const classes = ['syntaxhighlighter'];
			let tabSize,
				matches,
				lineNumbers
			;

			// process light mode
			if (this.getParam('light') == true)
				this.params.toolbar = this.params.gutter = false;

			className = 'syntaxhighlighter';

			if (this.getParam('collapse') == true)
				classes.push('collapsed');

			if ((gutter = this.getParam('gutter')) == false)
				classes.push('nogutter');

			// add custom user style name
			classes.push(this.getParam('class-name'));

			// add brush alias to the class name for custom CSS
			classes.push(this.getParam('brush'));

			code = trimFirstAndLastLines(code)
				.replace(/\r/g, ' ') // IE lets these buggers through
			;

			tabSize = this.getParam('tab-size');

			// replace tabs with spaces
			code = this.getParam('smart-tabs') == true
				? processSmartTabs(code, tabSize)
				: processTabs(code, tabSize)
			;

			// unindent code by the common indentation
			code = unindent(code);

			if (gutter)
				lineNumbers = this.figureOutLineNumbers(code);

			// find matches in the code using brushes regex list
			matches = this.findMatches(this.regexList, code);
			// processes found matches into the html
			html = this.getMatchesHtml(code, matches);
			// finally, split all lines so that they wrap well
			html = this.getCodeLinesHtml(html, lineNumbers);

			// finally, process the links
			if (this.getParam('auto-links'))
				html = processUrls(html);

			if (typeof (navigator) != 'undefined' && navigator.userAgent && navigator.userAgent.match(/MSIE/))
				classes.push('ie');

			html =
				'<div id="' + getHighlighterId(this.id) + '" class="' + classes.join(' ') + '">'
				+ (this.getParam('toolbar') ? sh.toolbar.getHtml(this) : '')
				+ '<table border="0" cellpadding="0" cellspacing="0">'
				+ this.getTitleHtml(this.getParam('title'))
				+ '<tbody>'
				+ '<tr>'
				+ (gutter ? '<td class="gutter">' + this.getLineNumbersHtml(code) + '</td>' : '')
				+ '<td class="code">'
				+ '<div class="container">'
				+ html
				+ '</div>'
				+ '</td>'
				+ '</tr>'
				+ '</tbody>'
				+ '</table>'
				+ '</div>'
			;

			return html;
		},

		/**
		 * Highlights the code and returns complete HTML.
		 * @param {String} code     Code to highlight.
		 * @return {Element}        Returns container DIV element with all markup.
		 */
		getDiv: function (code) {
			if (code === null)
				code = '';

			this.code = code;

			const div = this.create('div');

			// create main HTML
			div.innerHTML = this.getHtml(code);

			// set up click handlers
			if (this.getParam('toolbar'))
				attachEvent(findElement(div, '.toolbar'), 'click', sh.toolbar.handler);

			if (this.getParam('quick-code'))
				attachEvent(findElement(div, '.code'), 'dblclick', quickCodeHandler);

			return div;
		},

		/**
		 * Initializes the highlighter/brush.
		 *
		 * Constructor isn't used for initialization so that nothing executes during necessary
		 * `new SyntaxHighlighter.Highlighter()` call when setting up brush inheritence.
		 *
		 * @param {Hash} params Highlighter parameters.
		 */
		init: function (params) {
			this.id = guid();

			// register this instance in the highlighters list
			storeHighlighter(this);

			// local params take precedence over defaults
			this.params = merge(sh.defaults, params || {})

			// process light mode
			if (this.getParam('light') == true)
				this.params.toolbar = this.params.gutter = false;
		},

		/**
		 * Converts space separated list of keywords into a regular expression string.
		 * @param {String} str    Space separated keywords.
		 * @return {String}       Returns regular expression string.
		 */
		getKeywords: function (str) {
			str = str
				.replace(/^\s+|\s+$/g, '')
				.replace(/\s+/g, '|')
			;

			return '\\b(?:' + str + ')\\b';
		},

		/**
		 * Makes a brush compatible with the `html-script` functionality.
		 * @param {Object} regexGroup Object containing `left` and `right` regular expressions.
		 */
		forHtmlScript: function (regexGroup) {
			this.htmlScript = {
				left: {regex: regexGroup.left, css: 'script'},
				right: {regex: regexGroup.right, css: 'script'},
				code: new XRegExp(
					"(?<left>" + regexGroup.left.source + ")" +
					"(?<code>.*?)" +
					"(?<right>" + regexGroup.right.source + ")",
					"sgi"
				)
			};
		}
	}; // end of Highlighter

	return sh;
}(); // end of anonymous function

// CommonJS
typeof(exports) != 'undefined' ? exports['SyntaxHighlighter'] = SyntaxHighlighter : null;
