URL polyfill for IE.

7171391d · Tristan Cavelier · Romain Courteaud · 99929f72 · 7171391d
Commit 7171391d authored Jan 17, 2018 by Tristan Cavelier Committed by Romain Courteaud Jan 17, 2018
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lib/iefix/url.js lib/iefix/url.js +52 -0

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--- a/lib/iefix/url.js
+++ b/lib/iefix/url.js
+(function (DOMParser) {
+  "use strict";
+
+  try {
+    if ((new window.URL("../a", "https://example.com/")).href === "https://example.com/a") {
+      return;
+    }
+  } catch (ignore) {}
+
+  var isAbsoluteOrDataURL = /^(?:[a-z]+:)?\/\/|data:/i;
+
+  function resolveUrl(url, base_url) {
+    var doc, base, link,
+      html = "<!doctype><html><head></head></html>";
+ 
+    if (url && base_url) {
+      doc = (new DOMParser()).parseFromString(html, 'text/html');
+      base = doc.createElement('base');
+      link = doc.createElement('link');
+      doc.head.appendChild(base);
+      doc.head.appendChild(link);
+      base.href = base_url;
+      link.href = url;
+      return link.href;
+    }
+    return url;
+  }
+
+  function URL(url, base) {
+    if (base !== undefined) {
+      if (!isAbsoluteOrDataURL.test(base)) {
+        throw new TypeError("Failed to construct 'URL': Invalid base URL");
+      }
+      url = resolveUrl(url, base);
+    }
+    if (!isAbsoluteOrDataURL.test(url)) {
+      throw new TypeError("Failed to construct 'URL': Invalid URL");
+    }
+    this.href = url;
+  }
+  URL.prototype.href = "";
+
+  if (window.URL && window.URL.createObjectURL) {
+    URL.createObjectURL = window.URL.createObjectURL;
+  }
+  if (window.URL && window.URL.revokeObjectURL) {
+    URL.revokeObjectURL = window.URL.revokeObjectURL;
+  }
+
+  window.URL = URL;
+
+}(DOMParser));
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