Build HTMLFormElement::m_associatedElements lazily

Source/core/html/HTMLFormElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 93 matching lines @@
     };
 
     void requestAutocomplete();
     void finishRequestAutocomplete(AutocompleteResult);
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(autocomplete);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(autocompleteerror);
 
     CheckedRadioButtons& checkedRadioButtons() { return m_checkedRadioButtons; }
 
-    const Vector<FormAssociatedElement*>& associatedElements() const { return m_associatedElements; }
+    const Vector<FormAssociatedElement*>& associatedElements() const;
     const Vector<HTMLImageElement*>& imageElements();
 
     void getTextFieldValues(StringPairVector& fieldNamesAndValues) const;
     void anonymousNamedGetter(const AtomicString& name, bool&, RefPtr<RadioNodeList>&, bool&, RefPtr<Node>&);
 
 private:
     explicit HTMLFormElement(Document&);
 
     virtual bool rendererIsNeeded(const RenderStyle&) OVERRIDE;
     virtual InsertionNotificationRequest insertedInto(ContainerNode*) OVERRIDE;
     virtual void removedFrom(ContainerNode*) OVERRIDE;
     virtual void finishParsingChildren() OVERRIDE;
 
     virtual void handleLocalEvents(Event*) OVERRIDE;
 
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
     virtual bool isURLAttribute(const Attribute&) const OVERRIDE;
 
     virtual bool shouldRegisterAsNamedItem() const OVERRIDE { return true; }
 
     virtual void copyNonAttributePropertiesFromElement(const Element&) OVERRIDE;
 
     void submitDialog(PassRefPtr<FormSubmission>);
     void submit(Event*, bool activateSubmitButton, bool processingUserGesture, FormSubmissionTrigger);
 
     void scheduleFormSubmission(PassRefPtr<FormSubmission>);
 
-    unsigned formElementIndexWithFormAttribute(Element*, unsigned rangeStart, unsigned rangeEnd);
-    unsigned formElementIndex(FormAssociatedElement&);
+    void collectAssociatedElements(Node* root, Vector<FormAssociatedElement*>&) const;
     void collectImageElements(Node* root, Vector<HTMLImageElement*>&);
 
     // Returns true if the submission should proceed.
     bool validateInteractively(Event*);
 
     // Validates each of the controls, and stores controls of which 'invalid'
     // event was not canceled to the specified vector. Returns true if there
     // are any invalid controls in this form.
     bool checkInvalidControlsAndCollectUnhandled(Vector<RefPtr<FormAssociatedElement> >*, HTMLFormControlElement::CheckValidityDispatchEvents = HTMLFormControlElement::CheckValidityDispatchEventsAllowed);
 
     Node* elementFromPastNamesMap(const AtomicString&);
     void addToPastNamesMap(Node*, const AtomicString& pastName);
     void removeFromPastNamesMap(HTMLElement&);
 
     typedef HashMap<AtomicString, Node*> PastNamesMap;
 
     FormSubmission::Attributes m_attributes;
     OwnPtr<PastNamesMap> m_pastNamesMap;
 
     CheckedRadioButtons m_checkedRadioButtons;
 
-    unsigned m_associatedElementsBeforeIndex;
-    unsigned m_associatedElementsAfterIndex;
+    // Do not access m_associatedElements directly. Use associatedElements() instead.
     Vector<FormAssociatedElement*> m_associatedElements;
-    // Do not read m_imageElements directly. Use imageElements() instead.
+    // Do not access m_imageElements directly. Use imageElements() instead.
     Vector<HTMLImageElement*> m_imageElements;
     WeakPtrFactory<HTMLFormElement> m_weakPtrFactory;
+    bool m_associatedElementsAreDirty;
     bool m_imageElementsAreDirty;
     bool m_hasElementsAssociatedByParser;
     bool m_didFinishParsingChildren;
 
     bool m_wasUserSubmitted;
     bool m_isSubmittingOrPreparingForSubmission;
     bool m_shouldSubmit;
 
     bool m_isInResetFunction;
 
     bool m_wasDemoted;
 
     void requestAutocompleteTimerFired(Timer<HTMLFormElement>*);
 
     Vector<RefPtr<Event> > m_pendingAutocompleteEvents;
     Timer<HTMLFormElement> m_requestAutocompleteTimer;
 };
 
 DEFINE_NODE_TYPE_CASTS(HTMLFormElement, hasTagName(HTMLNames::formTag));
 
 } // namespace WebCore
 
 #endif // HTMLFormElement_h