[Webkit-unassigned] [Bug 89235] New: CSS3: line-break property support

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=89235

           Summary: CSS3: line-break property support
           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: jshin at chromium.org


http://dev.w3.org/csswg/css3-text/#line-break has introduced the following values for line-break. 

‘auto’
The UA determines the set of line-breaking restrictions to use, and it may vary the restrictions based on the length of the line; e.g., use a less restrictive set of line-break rules for short lines.
‘loose’
Breaks text using the least restrictive set of line-breaking rules. Typically used for short lines, such as in newspapers.
‘normal’
Breaks text using the most common set of line-breaking rules.
‘strict’
Breaks text using the most stringent set of line-breaking rules.


Depending on the value specified, line breaking behavior has to be different. 

For ports that use ICU, one possibility is to create separate line breaking iterators instances with different tailorings for each value. 

The other possibility (ports that can easily change ICU itself such as Chromium) is to add tailored line breaking rule files to ICU (  line_ja_strict for strict mode in  Japanese, line_ja_loose for loose mode in Japanese, etc) and pick one by changing the locale name. 


See also http://unicode.org/cldr/trac/ticket/4931 (CLDR feature request to parameterize line breaking rules).

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