[ES6 modules] Introduce ScriptModuleResolverImpl

third_party/WebKit/Source/core/dom/ScriptModuleResolverImpl.h

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef ScriptModuleResolverImpl_h
+#define ScriptModuleResolverImpl_h
+
+#include "bindings/core/v8/ScriptModule.h"
+#include "core/CoreExport.h"
+#include "core/dom/ScriptModuleResolver.h"
+#include "platform/heap/Handle.h"
+#include "wtf/HashMap.h"
+#include "wtf/text/WTFString.h"
+
+namespace blink {
+
+class Modulator;
+class ModuleScript;
+class ScriptModule;
+
+// The ScriptModuleResolverImpl implements ScriptModuleResolver interface
+// and implements "HostResolveImportedModule" HTML spec algorithm to bridge
+// ModuleMap (via Modulator) and V8 bindings.
+class CORE_EXPORT ScriptModuleResolverImpl final : public ScriptModuleResolver {
+ public:
+  static ScriptModuleResolverImpl* Create(Modulator* modulator) {
+    return new ScriptModuleResolverImpl(modulator);
+  }
+
+  DECLARE_VIRTUAL_TRACE();
+
+  // Implements ScriptModuleResolver:
+
+  void RegisterModuleScript(ModuleScript*) override;
+  // Implements "Runtime Semantics: HostResolveImportedModule" per HTML spec.
+  // https://html.spec.whatwg.org/#hostresolveimportedmodule(referencingmodule,-specifier)
+  ScriptModule Resolve(const String& specifier,
+                       const ScriptModule& referrer,
+                       ExceptionState&) override;
+
+ private:
+  explicit ScriptModuleResolverImpl(Modulator* modulator)
+      : modulator_(modulator) {}
+
+  // Corresponds to the spec concept "referencingModule.[[HostDefined]]".
+  HeapHashMap<ScriptModule, Member<ModuleScript>> record_to_module_script_map_;
+  Member<Modulator> modulator_;
+};
+
+}  // namespace blink
+
+#endif  // ScriptModuleResolverImpl_h