Reland of Split PendingScript into PendingScript and ClassicPendingScript

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

 /*
  * Copyright (C) 2010 Google, Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 10 matching lines @@
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef PendingScript_h
 #define PendingScript_h
 
 #include "bindings/core/v8/ScriptStreamer.h"
 #include "core/CoreExport.h"
+#include "core/dom/Script.h"
 #include "core/dom/ScriptElementBase.h"
-#include "core/loader/resource/ScriptResource.h"
-#include "platform/MemoryCoordinator.h"
 #include "platform/heap/Handle.h"
-#include "platform/loader/fetch/ResourceOwner.h"
+#include "platform/weborigin/KURL.h"
 #include "platform/wtf/Noncopyable.h"
 #include "platform/wtf/text/TextPosition.h"
 
 namespace blink {
 
+class Document;
 class PendingScript;
-class ClassicScript;
 
 class CORE_EXPORT PendingScriptClient : public GarbageCollectedMixin {
  public:
   virtual ~PendingScriptClient() {}
 
-  // Invoked when the pending script has finished loading. This could be during
-  // |watchForLoad| (if the pending script was already ready), or when the
+  // Invoked when the pending script is ready. This could be during
+  // WatchForLoad() (if the pending script was already ready), or when the
   // resource loads (if script streaming is not occurring), or when script
   // streaming finishes.
   virtual void PendingScriptFinished(PendingScript*) = 0;
 
   DEFINE_INLINE_VIRTUAL_TRACE() {}
 };
 
 // A container for an external script which may be loaded and executed.
-//
-// TODO(kochi): The comment below is from pre-oilpan age and may not be correct
-// now.
-// A RefPtr alone does not prevent the underlying Resource from purging its data
-// buffer. This class holds a dummy client open for its lifetime in order to
-// guarantee that the data buffer will not be purged.
-class CORE_EXPORT PendingScript final
-    : public GarbageCollectedFinalized<PendingScript>,
-      public ResourceOwner<ScriptResource>,
-      public MemoryCoordinatorClient {
-  USING_GARBAGE_COLLECTED_MIXIN(PendingScript);
+// This is used to receive a notification of "script is ready"
+// https://html.spec.whatwg.org/#the-script-is-ready via PendingScriptClient.
+class CORE_EXPORT PendingScript
+    : public GarbageCollectedFinalized<PendingScript> {
   USING_PRE_FINALIZER(PendingScript, Dispose);
   WTF_MAKE_NONCOPYABLE(PendingScript);
 
  public:
-  // For script from an external file.
-  static PendingScript* Create(ScriptElementBase*, ScriptResource*);
-  // For inline script.
-  static PendingScript* Create(ScriptElementBase*, const TextPosition&);
-
-  static PendingScript* CreateForTesting(ScriptResource*);
-
-  ~PendingScript() override;
+  virtual ~PendingScript();
 
   TextPosition StartingPosition() const { return starting_position_; }
   void MarkParserBlockingLoadStartTime();
   // Returns the time the load of this script started blocking the parser, or
   // zero if this script hasn't yet blocked the parser, in
   // monotonicallyIncreasingTime.
   double ParserBlockingLoadStartTime() const {
     return parser_blocking_load_start_time_;
   }
 
   void WatchForLoad(PendingScriptClient*);
   void StopWatchingForLoad();
 
   ScriptElementBase* GetElement() const;
 
-  DECLARE_TRACE();
+  virtual ScriptType GetScriptType() const = 0;
 
-  ClassicScript* GetSource(const KURL& document_url,
-                           bool& error_occurred) const;
+  DECLARE_VIRTUAL_TRACE();
 
-  void SetStreamer(ScriptStreamer*);
-  void StreamingFinished();
+  virtual Script* GetSource(const KURL& document_url,
+                            bool& error_occurred) const = 0;
 
-  bool IsReady() const;
-  bool ErrorOccurred() const;
+  // https://html.spec.whatwg.org/#the-script-is-ready
+  virtual bool IsReady() const = 0;
 
-  void StartStreamingIfPossible(Document*, ScriptStreamer::Type);
+  virtual KURL Url() const = 0;
+  virtual bool IsExternal() const = 0;
+  virtual bool ErrorOccurred() const = 0;
+  virtual bool WasCanceled() const = 0;
+  virtual void StartStreamingIfPossible(Document*, ScriptStreamer::Type) = 0;
+
+  // Used for document.write() intervention.
+  // Has effects only for classic scripts.
+  virtual void RemoveFromMemoryCache() = 0;
+
   void Dispose();
 
+ protected:
+  PendingScript(ScriptElementBase*, const TextPosition& starting_position);
+
+  virtual void DisposeInternal() = 0;
+
+  PendingScriptClient* Client() { return client_; }
+  bool IsWatchingForLoad() const { return watching_for_load_; }
+
+  virtual void CheckState() const = 0;
+
  private:
-  PendingScript(ScriptElementBase*,
-                ScriptResource*,
-                const TextPosition&,
-                bool is_for_testing = false);
-  PendingScript() = delete;
-
-  void CheckState() const;
-
-  // ScriptResourceClient
-  void NotifyFinished(Resource*) override;
-  String DebugName() const override { return "PendingScript"; }
-  void NotifyAppendData(ScriptResource*) override;
-
-  // MemoryCoordinatorClient
-  void OnPurgeMemory() override;
-
   bool watching_for_load_;
 
   // |m_element| must points to the corresponding ScriptLoader's
   // ScriptElementBase and thus must be non-null before dispose() is called
   // (except for unit tests).
   Member<ScriptElementBase> element_;
 
   TextPosition starting_position_;  // Only used for inline script tags.
-  bool integrity_failure_;
   double parser_blocking_load_start_time_;
 
-  Member<ScriptStreamer> streamer_;
   Member<PendingScriptClient> client_;
-
-  // This flag is used to skip non-null checks of |m_element| in unit
-  // tests, because |m_element| can be null in unit tests.
-  const bool is_for_testing_;
 };
 
 }  // namespace blink
 
 #endif  // PendingScript_h