08-27-周三_17-09-29

node_modules/prismjs/plugins/line-numbers/prism-line-numbers.js

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+(function () {
+
+	if (typeof self === 'undefined' || !self.Prism || !self.document) {
+		return;
+	}
+
+	/**
+	 * Plugin name which is used as a class name for <pre> which is activating the plugin
+	 * @type {String}
+	 */
+	var PLUGIN_NAME = 'line-numbers';
+
+	/**
+	 * Regular expression used for determining line breaks
+	 * @type {RegExp}
+	 */
+	var NEW_LINE_EXP = /\n(?!$)/g;
+
+	/**
+	 * Resizes line numbers spans according to height of line of code
+	 * @param {Element} element <pre> element
+	 */
+	var _resizeElement = function (element) {
+		var codeStyles = getStyles(element);
+		var whiteSpace = codeStyles['white-space'];
+
+		if (whiteSpace === 'pre-wrap' || whiteSpace === 'pre-line') {
+			var codeElement = element.querySelector('code');
+			var lineNumbersWrapper = element.querySelector('.line-numbers-rows');
+			var lineNumberSizer = element.querySelector('.line-numbers-sizer');
+			var codeLines = codeElement.textContent.split(NEW_LINE_EXP);
+
+			if (!lineNumberSizer) {
+				lineNumberSizer = document.createElement('span');
+				lineNumberSizer.className = 'line-numbers-sizer';
+
+				codeElement.appendChild(lineNumberSizer);
+			}
+
+			lineNumberSizer.style.display = 'block';
+
+			codeLines.forEach(function (line, lineNumber) {
+				lineNumberSizer.textContent = line || '\n';
+				var lineSize = lineNumberSizer.getBoundingClientRect().height;
+				lineNumbersWrapper.children[lineNumber].style.height = lineSize + 'px';
+			});
+
+			lineNumberSizer.textContent = '';
+			lineNumberSizer.style.display = 'none';
+		}
+	};
+
+	/**
+	 * Returns style declarations for the element
+	 * @param {Element} element
+	 */
+	var getStyles = function (element) {
+		if (!element) {
+			return null;
+		}
+
+		return window.getComputedStyle ? getComputedStyle(element) : (element.currentStyle || null);
+	};
+
+	window.addEventListener('resize', function () {
+		Array.prototype.forEach.call(document.querySelectorAll('pre.' + PLUGIN_NAME), _resizeElement);
+	});
+
+	Prism.hooks.add('complete', function (env) {
+		if (!env.code) {
+			return;
+		}
+
+		var code = env.element;
+		var pre = code.parentNode;
+
+		// works only for <code> wrapped inside <pre> (not inline)
+		if (!pre || !/pre/i.test(pre.nodeName)) {
+			return;
+		}
+
+		// Abort if line numbers already exists
+		if (code.querySelector('.line-numbers-rows')) {
+			return;
+		}
+
+		var addLineNumbers = false;
+		var lineNumbersRegex = /(?:^|\s)line-numbers(?:\s|$)/;
+
+		for (var element = code; element; element = element.parentNode) {
+			if (lineNumbersRegex.test(element.className)) {
+				addLineNumbers = true;
+				break;
+			}
+		}
+
+		// only add line numbers if <code> or one of its ancestors has the `line-numbers` class
+		if (!addLineNumbers) {
+			return;
+		}
+
+		// Remove the class 'line-numbers' from the <code>
+		code.className = code.className.replace(lineNumbersRegex, ' ');
+		// Add the class 'line-numbers' to the <pre>
+		if (!lineNumbersRegex.test(pre.className)) {
+			pre.className += ' line-numbers';
+		}
+
+		var match = env.code.match(NEW_LINE_EXP);
+		var linesNum = match ? match.length + 1 : 1;
+		var lineNumbersWrapper;
+
+		var lines = new Array(linesNum + 1).join('<span></span>');
+
+		lineNumbersWrapper = document.createElement('span');
+		lineNumbersWrapper.setAttribute('aria-hidden', 'true');
+		lineNumbersWrapper.className = 'line-numbers-rows';
+		lineNumbersWrapper.innerHTML = lines;
+
+		if (pre.hasAttribute('data-start')) {
+			pre.style.counterReset = 'linenumber ' + (parseInt(pre.getAttribute('data-start'), 10) - 1);
+		}
+
+		env.element.appendChild(lineNumbersWrapper);
+
+		_resizeElement(pre);
+
+		Prism.hooks.run('line-numbers', env);
+	});
+
+	Prism.hooks.add('line-numbers', function (env) {
+		env.plugins = env.plugins || {};
+		env.plugins.lineNumbers = true;
+	});
+
+	/**
+	 * Global exports
+	 */
+	Prism.plugins.lineNumbers = {
+		/**
+		 * Get node for provided line number
+		 * @param {Element} element pre element
+		 * @param {Number} number line number
+		 * @return {Element|undefined}
+		 */
+		getLine: function (element, number) {
+			if (element.tagName !== 'PRE' || !element.classList.contains(PLUGIN_NAME)) {
+				return;
+			}
+
+			var lineNumberRows = element.querySelector('.line-numbers-rows');
+			var lineNumberStart = parseInt(element.getAttribute('data-start'), 10) || 1;
+			var lineNumberEnd = lineNumberStart + (lineNumberRows.children.length - 1);
+
+			if (number < lineNumberStart) {
+				number = lineNumberStart;
+			}
+			if (number > lineNumberEnd) {
+				number = lineNumberEnd;
+			}
+
+			var lineIndex = number - lineNumberStart;
+
+			return lineNumberRows.children[lineIndex];
+		}
+	};
+
+}());