[WIP Prototype] ES6 https://html.spec.whatwg.org/#fetch-a-single-module-script implementation

third_party/WebKit/Source/core/dom/ScriptLoader.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2008 Nikolas Zimmermann <zimmermann@kde.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 16 matching lines @@
 #include "bindings/core/v8/ScriptController.h"
 #include "bindings/core/v8/ScriptSourceCode.h"
 #include "core/HTMLNames.h"
 #include "core/SVGNames.h"
 #include "core/dom/Document.h"
 #include "core/dom/DocumentParserTiming.h"
 #include "core/dom/IgnoreDestructiveWriteCountIncrementer.h"
 #include "core/dom/ScriptLoaderClient.h"
 #include "core/dom/ScriptRunner.h"
 #include "core/dom/ScriptableDocumentParser.h"
+#include "core/dom/ModuleMap.h"
 #include "core/dom/Text.h"
 #include "core/events/Event.h"
 #include "core/fetch/AccessControlStatus.h"
 #include "core/fetch/FetchRequest.h"
 #include "core/fetch/MemoryCache.h"
 #include "core/fetch/ResourceFetcher.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/SubresourceIntegrity.h"
 #include "core/frame/UseCounter.h"
 #include "core/frame/csp/ContentSecurityPolicy.h"
@@ skipping 206 matching lines @@
     m_characterEncoding = elementDocument.characterSet();
 
   if (client->hasSourceAttribute()) {
     FetchRequest::DeferOption defer = FetchRequest::NoDefer;
     if (!m_parserInserted || client->asyncAttributeValue() ||
         client->deferAttributeValue())
       defer = FetchRequest::LazyLoad;
     if (m_documentWriteIntervention ==
         DocumentWriteIntervention::FetchDocWrittenScriptDeferIdle)
       defer = FetchRequest::IdleLoad;
+
     if (!fetchScript(client->sourceAttributeValue(), defer))
       return false;
   }
 
   // Since the asynchronous, low priority fetch for doc.written blocked
   // script is not for execution, return early from here. Watch for its
   // completion to be able to remove it from the memory cache.
   if (m_documentWriteIntervention ==
       DocumentWriteIntervention::FetchDocWrittenScriptDeferIdle) {
     m_pendingScript = PendingScript::create(m_element, m_resource.get());
@@ skipping 55 matching lines @@
 
 bool ScriptLoader::fetchScript(const String& sourceUrl,
                                FetchRequest::DeferOption defer) {
   DCHECK(m_element);
 
   Document* elementDocument = &(m_element->document());
   if (!m_element->isConnected() || m_element->document() != elementDocument)
     return false;
 
   DCHECK(!m_resource);
+
   if (!stripLeadingAndTrailingHTMLSpaces(sourceUrl).isEmpty()) {
-    FetchRequest request(
-        ResourceRequest(elementDocument->completeURL(sourceUrl)),
-        m_element->localName());
+    KURL url = elementDocument->completeURL(sourceUrl);
+
+    if (RuntimeEnabledFeatures::moduleScriptsEnabled() &&
+        client()->typeAttributeValue() == "module") {
+      elementDocument->ensureModuleMap()->fetch(url);
+      return true;
+    }
+
+    FetchRequest request(ResourceRequest(url), m_element->localName());
 
     CrossOriginAttributeValue crossOrigin = crossOriginAttributeValue(
         m_element->fastGetAttribute(HTMLNames::crossoriginAttr));
     if (crossOrigin != CrossOriginAttributeNotSet)
       request.setCrossOriginAccessControl(elementDocument->getSecurityOrigin(),
                                           crossOrigin);
     request.setCharset(scriptCharset());
 
     if (ContentSecurityPolicy::isNonceableElement(m_element.get())) {
       request.setContentSecurityPolicyNonce(
@@ skipping 294 matching lines @@
   if (isHTMLScriptLoader(element))
     return toHTMLScriptElement(element)->loader();
 
   if (isSVGScriptLoader(element))
     return toSVGScriptElement(element)->loader();
 
   return 0;
 }
 
 }  // namespace blink