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80 lines
2.8 KiB
80 lines
2.8 KiB
4 years ago
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// addapted from the document.currentScript polyfill by Adam Miller
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// MIT license
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// source: https://github.com/amiller-gh/currentScript-polyfill
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// added support for Firefox https://bugzilla.mozilla.org/show_bug.cgi?id=1620505
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(function (root, factory) {
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if (typeof define === 'function' && define.amd) {
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define([], factory);
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} else if (typeof module === 'object' && module.exports) {
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module.exports = factory();
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} else {
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root.getCurrentScript = factory();
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}
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}(typeof self !== 'undefined' ? self : this, function () {
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function getCurrentScript () {
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var descriptor = Object.getOwnPropertyDescriptor(document, 'currentScript')
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// for chrome
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if (!descriptor && 'currentScript' in document && document.currentScript) {
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return document.currentScript
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}
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// for other browsers with native support for currentScript
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if (descriptor && descriptor.get !== getCurrentScript && document.currentScript) {
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return document.currentScript
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}
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// IE 8-10 support script readyState
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// IE 11+ & Firefox support stack trace
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try {
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throw new Error();
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}
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catch (err) {
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// Find the second match for the "at" string to get file src url from stack.
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var ieStackRegExp = /.*at [^(]*\((.*):(.+):(.+)\)$/ig,
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ffStackRegExp = /@([^@]*):(\d+):(\d+)\s*$/ig,
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stackDetails = ieStackRegExp.exec(err.stack) || ffStackRegExp.exec(err.stack),
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scriptLocation = (stackDetails && stackDetails[1]) || false,
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line = (stackDetails && stackDetails[2]) || false,
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currentLocation = document.location.href.replace(document.location.hash, ''),
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pageSource,
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inlineScriptSourceRegExp,
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inlineScriptSource,
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scripts = document.getElementsByTagName('script'); // Live NodeList collection
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if (scriptLocation === currentLocation) {
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pageSource = document.documentElement.outerHTML;
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inlineScriptSourceRegExp = new RegExp('(?:[^\\n]+?\\n){0,' + (line - 2) + '}[^<]*<script>([\\d\\D]*?)<\\/script>[\\d\\D]*', 'i');
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inlineScriptSource = pageSource.replace(inlineScriptSourceRegExp, '$1').trim();
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}
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for (var i = 0; i < scripts.length; i++) {
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// If ready state is interactive, return the script tag
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if (scripts[i].readyState === 'interactive') {
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return scripts[i];
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}
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// If src matches, return the script tag
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if (scripts[i].src === scriptLocation) {
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return scripts[i];
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}
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// If inline source matches, return the script tag
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if (
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scriptLocation === currentLocation &&
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scripts[i].innerHTML &&
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scripts[i].innerHTML.trim() === inlineScriptSource
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) {
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return scripts[i];
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}
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}
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// If no match, return null
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return null;
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}
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};
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return getCurrentScript
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}));
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