[Webkit-unassigned] [Bug 133543] New: [CSS Grid Layout] Simplify the named grid lines resolution algorithm

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=133543

           Summary: [CSS Grid Layout] Simplify the named grid lines
                    resolution algorithm
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: svillar at igalia.com


The support for placing grid items using named grid lines was added in r164869 and later improved in r166299. Despite being correct the code turned out to be quite complex. It's difficult to understand and maintain. It can be heavily simplified if we previously insert the implicit named grid lines generated by grid areas into the list of user-defined named grid lines. If we do that we could directly apply the algorithm described in the spec http://dev.w3.org/csswg/css-grid/#grid-placement-slot

As a nice side effect, we'll get for free the use case specified in section "5.2.2 Implicit Named Areas", i.e., explicitly adding named lines of the form (foo-start/foo-end) will effectively create a named grid area.

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