kmx.io/prism.js/plugins/keep-markup/prism-keep-markup.js

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• Hash : 8a843a17
  Author :
  Date : 2022-03-05T22:03:09
  

  Keep Markup: Use original nodes instead of clones (#3365)

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• plugins/keep-markup/prism-keep-markup.js

• (function () {
  
  	if (typeof Prism === 'undefined' || typeof document === 'undefined' || !document.createRange) {
  		return;
  	}
  
  	Prism.plugins.KeepMarkup = true;
  
  	Prism.hooks.add('before-highlight', function (env) {
  		if (!env.element.children.length) {
  			return;
  		}
  
  		if (!Prism.util.isActive(env.element, 'keep-markup', true)) {
  			return;
  		}
  
  		var dropTokens = Prism.util.isActive(env.element, 'drop-tokens', false);
  		/**
  		 * Returns whether the given element should be kept.
  		 *
  		 * @param {HTMLElement} element
  		 * @returns {boolean}
  		 */
  		function shouldKeep(element) {
  			if (dropTokens && element.nodeName.toLowerCase() === 'span' && element.classList.contains('token')) {
  				return false;
  			}
  			return true;
  		}
  
  		var pos = 0;
  		var data = [];
  		function processElement(element) {
  			if (!shouldKeep(element)) {
  				// don't keep this element and just process its children
  				processChildren(element);
  				return;
  			}
  
  			var o = {
  				// Store original element so we can restore it after highlighting
  				element: element,
  				posOpen: pos
  			};
  			data.push(o);
  
  			processChildren(element);
  
  			o.posClose = pos;
  		}
  		function processChildren(element) {
  			for (var i = 0, l = element.childNodes.length; i < l; i++) {
  				var child = element.childNodes[i];
  				if (child.nodeType === 1) { // element
  					processElement(child);
  				} else if (child.nodeType === 3) { // text
  					pos += child.data.length;
  				}
  			}
  		}
  		processChildren(env.element);
  
  		if (data.length) {
  			// data is an array of all existing tags
  			env.keepMarkup = data;
  		}
  	});
  
  	Prism.hooks.add('after-highlight', function (env) {
  		if (env.keepMarkup && env.keepMarkup.length) {
  
  			var walk = function (elt, nodeState) {
  				for (var i = 0, l = elt.childNodes.length; i < l; i++) {
  
  					var child = elt.childNodes[i];
  
  					if (child.nodeType === 1) { // element
  						if (!walk(child, nodeState)) {
  							return false;
  						}
  
  					} else if (child.nodeType === 3) { // text
  						if (!nodeState.nodeStart && nodeState.pos + child.data.length > nodeState.node.posOpen) {
  							// We found the start position
  							nodeState.nodeStart = child;
  							nodeState.nodeStartPos = nodeState.node.posOpen - nodeState.pos;
  						}
  						if (nodeState.nodeStart && nodeState.pos + child.data.length >= nodeState.node.posClose) {
  							// We found the end position
  							nodeState.nodeEnd = child;
  							nodeState.nodeEndPos = nodeState.node.posClose - nodeState.pos;
  						}
  
  						nodeState.pos += child.data.length;
  					}
  
  					if (nodeState.nodeStart && nodeState.nodeEnd) {
  						// Select the range and wrap it with the element
  						var range = document.createRange();
  						range.setStart(nodeState.nodeStart, nodeState.nodeStartPos);
  						range.setEnd(nodeState.nodeEnd, nodeState.nodeEndPos);
  						nodeState.node.element.innerHTML = '';
  						nodeState.node.element.appendChild(range.extractContents());
  						range.insertNode(nodeState.node.element);
  						range.detach();
  
  						// Process is over
  						return false;
  					}
  				}
  				return true;
  			};
  
  			// For each tag, we walk the DOM to reinsert it
  			env.keepMarkup.forEach(function (node) {
  				walk(env.element, {
  					node: node,
  					pos: 0
  				});
  			});
  			// Store new highlightedCode for later hooks calls
  			env.highlightedCode = env.element.innerHTML;
  		}
  	});
  }());
  

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