[Webkit-unassigned] [Bug 93455] New: Extract DOM modifications in the HTML5 parser into DOMModifier.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=93455

           Summary: Extract DOM modifications in the HTML5 parser into
                    DOMModifier.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: skyul at company100.net


This patch extracts DOM modifications in the parser into DOMModifier and makes the tree builder and the element stack use it. DOMModifier can change its behavior dynamically by changing its strategy. The default strategy of DOMModifier is set to ImmediateDOMModifierStrategy which calls DOM operations synchronously.

This refactoring is a preparation for speculative parsing. To run the parser in speculation mode, we must be able to queue up DOM modifications. We can do this by adding DeferredDOMModifierStategy which queues up DOM operations and execute them later.

Both ImmediateDOMModifierStrategy and DeferredDOMModifierStategy eventually perform the same DOM operations. So I added DOMModifierExecutor which performs the actual DOM operations. DOMModifierStrategy classes should delegate to DOMModifierExecutor to remove code duplication.

Changed HTMLDocumentParser to own a DOMModifier instance and pass it to HTMLTreeBuilder, HTMLConstructionSite and HTMLElementStack.

This patch is not complete. HTMLConstructionSite still has DOM modifications including element creation. I will move the remaining DOM modifications into DOMModifier in a follow-up patch.

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