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/* ──────────────────────────────────────────────────────────────────────────── |
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Utility helpers |
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────────────────────────────────────────────────────────────────────────── */ |
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|
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(function () { |
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'use strict'; |
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|
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/* ---------- insertAfter ------------------------------------------------ */ |
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/* Fast path for “append” avoids creating a reference to nextSibling. */ |
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function insertAfter(newNode, referenceNode) { |
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const parent = referenceNode.parentNode; |
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if (parent.lastChild === referenceNode) { |
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parent.appendChild(newNode); |
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} else { |
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parent.insertBefore(newNode, referenceNode.nextSibling); |
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} |
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} |
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|
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/* ---------- getElementByXPath ----------------------------------------- */ |
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/* 1) Use native evaluate where available (all evergreen browsers). */ |
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/* 2) Small, allocation-free fallback for very old IE engines. */ |
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function getElementByXPath(xPath, doc = document) { |
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if (doc.evaluate) { |
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// XPathResult.FIRST_ORDERED_NODE_TYPE = 9 |
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return doc.evaluate( |
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xPath, |
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doc, |
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null, |
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9, |
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null |
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).singleNodeValue; |
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} |
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|
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// Fallback (legacy IE) – minimal parsing, no .filter / regex loops |
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xPath = xPath.replace(/^\/+/, ''); // strip leading “/” |
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const steps = xPath.split('/'); |
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let current = doc; |
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|
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for (let i = 0, l = steps.length; i < l && current; i += 1) { |
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const match = /([^\[\]]+)(?:\[(\d+)\])?/.exec(steps[i]); |
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if (!match) return null; |
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const [, tag, idx] = match; |
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const pos = idx ? (idx - 1) : 0; // XPath indices are 1-based |
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current = current.getElementsByTagName(tag)[pos] || null; |
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} |
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return current; |
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} |
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|
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/* ---------- Array.prototype.filter polyfill (unchanged API) ------------ */ |
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/* MIT – kept for <= IE8; tightened slightly for speed/readability. */ |
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/* eslint-disable-next-line no-extend-native */ |
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if (!Array.prototype.filter) { |
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Array.prototype.filter = function (callback, thisArg) { |
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if (typeof callback !== 'function') throw new TypeError(); |
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const out = []; |
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for (let i = 0, l = this.length >>> 0; i < l; i += 1) { |
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if (i in this) { |
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const val = this[i]; |
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if (callback.call(thisArg, val, i, this)) out.push(val); |
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} |
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} |
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return out; |
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}; |
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} |
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|
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/* ---------- Injection helpers ----------------------------------------- */ |
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|
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function injectWidgetByXpath(xpath) { |
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const anchor = |
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getElementByXPath(xpath) || document.getElementById('tbdefault'); |
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if (anchor) innerInject(anchor); |
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} |
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|
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function injectWidgetByMarker(markerId) { |
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const markerNode = document.getElementById(markerId); |
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if (markerNode && markerNode.parentNode) innerInject(markerNode.parentNode); |
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} |
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|
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/* One reflow: build everything in a fragment, then insert once. */ |
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function innerInject(node) { |
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if (!node) return; |
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|
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const fragment = document.createDocumentFragment(); |
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const container = document.createElement('span'); |
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const script = document.createElement('script'); |
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|
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/* Keep single quotes – some minifiers mangle this otherwise. */ |
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container.insertAdjacentHTML('beforeend', '{{HTML}}'); |
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script.text = "{{SCRIPT}}"; |
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|
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fragment.appendChild(container); |
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fragment.appendChild(script); |
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insertAfter(fragment, node); |
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} |
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|
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/* ---------- Export to global scope (names unchanged) ------------------- */ |
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window.insertAfter = insertAfter; |
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window.getElementByXPath = getElementByXPath; |
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window.injectWidgetByXpath = injectWidgetByXpath; |
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window.injectWidgetByMarker = injectWidgetByMarker; |
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window.innerInject = innerInject; |
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}()); |
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