[Webkit-unassigned] [Bug 150559] New: Pattern matcher should support delegation

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=150559

            Bug ID: 150559
           Summary: Pattern matcher should support delegation
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fpizlo at apple.com

Currently, if you write two pattern matchers and you implement one by sometimes using the other as a helper, then the helper will return the first match that works for it regardless of what the outer matcher wants.  For example, the outer matcher might want any address except for Index, and so it might want to use the address matcher but somehow tell it "please skip anything that produces Index".  But this is currently hard.  You'd have to manually set some state on the address matcher that tells it what kinds of things to filter out, and write code in the address matcher that applies the filter.  It would be better if this was easier to do.  For example, when you runAddressMatcher, you could provide a functor that filters the results of the address matcher.  This could be made even better if matchers returned a value rather than void.

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