100 lines
2.6 KiB
JavaScript
100 lines
2.6 KiB
JavaScript
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(function () {
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if (typeof self === 'undefined' || !self.Prism || !self.document || !document.createRange) {
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return;
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}
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Prism.plugins.KeepMarkup = true;
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Prism.hooks.add('before-highlight', function (env) {
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if (!env.element.children.length) {
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return;
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}
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var pos = 0;
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var data = [];
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var f = function (elt, baseNode) {
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var o = {};
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if (!baseNode) {
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// Clone the original tag to keep all attributes
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o.clone = elt.cloneNode(false);
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o.posOpen = pos;
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data.push(o);
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}
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for (var i = 0, l = elt.childNodes.length; i < l; i++) {
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var child = elt.childNodes[i];
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if (child.nodeType === 1) { // element
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f(child);
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} else if(child.nodeType === 3) { // text
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pos += child.data.length;
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}
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}
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if (!baseNode) {
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o.posClose = pos;
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}
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};
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f(env.element, true);
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if (data && data.length) {
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// data is an array of all existing tags
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env.keepMarkup = data;
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}
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});
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Prism.hooks.add('after-highlight', function (env) {
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if(env.keepMarkup && env.keepMarkup.length) {
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var walk = function (elt, nodeState) {
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for (var i = 0, l = elt.childNodes.length; i < l; i++) {
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var child = elt.childNodes[i];
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if (child.nodeType === 1) { // element
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if (!walk(child, nodeState)) {
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return false;
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}
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} else if (child.nodeType === 3) { // text
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if(!nodeState.nodeStart && nodeState.pos + child.data.length > nodeState.node.posOpen) {
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// We found the start position
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nodeState.nodeStart = child;
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nodeState.nodeStartPos = nodeState.node.posOpen - nodeState.pos;
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}
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if(nodeState.nodeStart && nodeState.pos + child.data.length >= nodeState.node.posClose) {
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// We found the end position
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nodeState.nodeEnd = child;
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nodeState.nodeEndPos = nodeState.node.posClose - nodeState.pos;
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}
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nodeState.pos += child.data.length;
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}
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if (nodeState.nodeStart && nodeState.nodeEnd) {
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// Select the range and wrap it with the clone
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var range = document.createRange();
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range.setStart(nodeState.nodeStart, nodeState.nodeStartPos);
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range.setEnd(nodeState.nodeEnd, nodeState.nodeEndPos);
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nodeState.node.clone.appendChild(range.extractContents());
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range.insertNode(nodeState.node.clone);
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range.detach();
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// Process is over
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return false;
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}
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}
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return true;
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};
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// For each tag, we walk the DOM to reinsert it
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env.keepMarkup.forEach(function (node) {
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walk(env.element, {
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node: node,
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pos: 0
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});
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});
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// Store new highlightedCode for later hooks calls
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env.highlightedCode = env.element.innerHTML;
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}
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});
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}());
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