[Webkit-unassigned] [Bug 50916] New: Add support for dir=auto

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=50916

           Summary: Add support for dir=auto
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
               URL: http://dev.w3.org/html5/spec/Overview.html#the-dir-att
                    ribute
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: playmobil at google.com
                CC: mitz at webkit.org, xji at chromium.org, rniwa at webkit.org
            Blocks: 50910


>From http://dev.w3.org/html5/spec/Overview.html#the-dir-attribute:

The auto keyword, which maps to the auto state
Indicates that the contents of the element are explicitly embedded text, but that the direction is to be determined programmatically using the contents of the element (as described below).

The heuristic used by this state is very crude (it just looks at the first character with a strong directionality, in a manner analogous to the Paragraph Level determination in the bidirectional algorithm). Authors are urged to only use this value as a last resort when the direction of the text is truly unknown and no better server-side heuristic can be applied.

...

If the element's dir attribute is in the auto state
If the element is a bdi element and the dir attribute is not in a defined state (i.e. it is not present or has an invalid value)
Find the first character in tree order that matches the following criteria:

The character is from a text node that is a descendant of the element whose directionality is being determined.

The character is of bidirectional character type L, AL, or R. [BIDI]

The character is not in a text node that has an ancestor element that is a descendant of the element whose directionality is being determined and that is either:

A bdi element.
A script element.
A style element.
An element with a dir attribute in a defined state.
If such a character is found and it is of bidirectional character type AL or R, the directionality of the element is 'rtl'.

Otherwise, the directionality of the element is 'ltr'.

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