Changes between Version 5 and Version 6 of LineBreaking


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Timestamp:
Aug 31, 2012 6:14:26 AM (10 years ago)
Author:
glenn@skynav.com
Comment:

Elaborate content.

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  • LineBreaking

    v5 v6  
    5353|| `after-white-space` || break only after specific white space characters ||
    5454
     55See [[LineBreakingCSS3Mapping|Line Breaking Behavior Details]] for further details of the interpretation of these values.
     56
    5557=== Implementation Details ===
     58
     59When WebKit needs to render a block of text, it uses the [http://icu-project.org/ ICU] library to determine where line breaks are mandatory, forbidden, or optional (see {{{RenderBlock::LineBreaker::nextLineBreak}}}). This library provides a number of rule sets, keyed by the locale's primary language sub tag, to determine line break boundaries, where this language sub tag is determined by rules specific to the document language definition. For example, for HTML5 see [http://www.w3.org/TR/html5/global-attributes.html#the-lang-and-xml:lang-attributes the lang and xml:lang attributes].
     60
     61In the current release for [http://icu-project.org/apiref/icu4c50m1/ ICU] (version 50), the following line break rule sets are provided:
     62
     63 * [http://source.icu-project.org/repos/icu/icu/trunk/source/data/brkitr/line.txt line.txt] primary language unspecified or no tailored rule set exists
     64 * [http://source.icu-project.org/repos/icu/icu/trunk/source/data/brkitr/line_fi.txt line_fi.txt] primary language is Finnish (`fi`)
     65 * [http://source.icu-project.org/repos/icu/icu/trunk/source/data/brkitr/line_ja.txt line_ja.txt] primary language is Japanese (`ja`)
     66
     67In general, these rule sets attempt to implement the rules defined by [http://www.unicode.org/reports/tr14/ UAX14].
     68
     69In order to support the ''new'' `-webkit-line-break` property defined above, WebKit implements the specific behavior defined in [[LineBreakingCSS3Mapping|Line Breaking Behavior Details]].
    5670
    5771== References ==