[Webkit-unassigned] [Bug 159213] New: Move MathML-specific code into a separate accessibility class

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=159213

            Bug ID: 159213
           Summary: Move MathML-specific code into a separate
                    accessibility class
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Accessibility
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fred.wang at free.fr
                CC: webkit-bug-importer at group.apple.com

Currently, MathML is completely handled in the generic AccessibilityRenderObject and it's sometimes not very convenient to work with. We could improve the organization a bit and move MathML-specific code into a separate AccessibilityMathMLElement class:

1) textUnderElement

  The case isAnonymousMathOperator() can be moved into AccessibilityMathMLElement.

2) computeAccessibilityIsIgnored (and its helper function isIgnoredElementWithinMathTree)

   We can easily return the boolean value for math elements. However, we also ignore anonymous RenderBlock inside MathML which are *not* mathml renderers, so some special handling must be kept in AccessibilityRenderObject.

3) determineAccessibilityRole

   We can move the mapping mathTag => DocumentMathRole into AccessibilityMathMLElement.

4) All the other math functions (isMathElement, mathRadicandObject etc) can directly be moved into AccessibilityMathMLElement.

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