Source/WebCore: Add support to -webkit-line-break property for CSS3 Text line-break property values and semantics.
https://bugs.webkit.org/show_bug.cgi?id=89235

Reviewed by Eric Seidel.

This patch adds semantic support for the CSS3 line-break property (qua -webkit-line-break),
and enables testing on (apple) mac ports. Follow on patches will enable these tests on
other ports as they are incrementally verified.

See also wiki documentation at:
[1] http://trac.webkit.org/wiki/LineBreaking
[2] http://trac.webkit.org/wiki/LineBreakingCSS3Mapping

Tests: css3/line-break/line-break-auto-centered.html
       css3/line-break/line-break-auto-half-kana.html
       css3/line-break/line-break-auto-hyphens.html
       css3/line-break/line-break-auto-inseparables.html
       css3/line-break/line-break-auto-iteration-marks.html
       css3/line-break/line-break-auto-postfixes.html
       css3/line-break/line-break-auto-prefixes.html
       css3/line-break/line-break-auto-sound-marks.html
       css3/line-break/line-break-loose-centered.html
       css3/line-break/line-break-loose-half-kana.html
       css3/line-break/line-break-loose-hyphens.html
       css3/line-break/line-break-loose-inseparables.html
       css3/line-break/line-break-loose-iteration-marks.html
       css3/line-break/line-break-loose-postfixes.html
       css3/line-break/line-break-loose-prefixes.html
       css3/line-break/line-break-loose-sound-marks.html
       css3/line-break/line-break-normal-centered.html
       css3/line-break/line-break-normal-half-kana.html
       css3/line-break/line-break-normal-hyphens.html
       css3/line-break/line-break-normal-inseparables.html
       css3/line-break/line-break-normal-iteration-marks.html
       css3/line-break/line-break-normal-postfixes.html
       css3/line-break/line-break-normal-prefixes.html
       css3/line-break/line-break-normal-sound-marks.html
       css3/line-break/line-break-strict-centered.html
       css3/line-break/line-break-strict-half-kana.html
       css3/line-break/line-break-strict-hyphens.html
       css3/line-break/line-break-strict-inseparables.html
       css3/line-break/line-break-strict-iteration-marks.html
       css3/line-break/line-break-strict-postfixes.html
       css3/line-break/line-break-strict-prefixes.html
       css3/line-break/line-break-strict-sound-marks.html

These tests were previously added in http://trac.webkit.org/changeset/143378, but skipped
in generic TestExpectations. In this patch, they are marked as Pass for the (apple) mac ports.

* platform/text/LineBreakIteratorPoolICU.h:
(WebCore::LineBreakIteratorPool::makeLocaleWithBreakKeyword):
Add static function to construct ICU locale argument (also used as pool key) with additional
break keyword.
(LineBreakIteratorPool):
(WebCore::LineBreakIteratorPool::take):
(WebCore::LineBreakIteratorPool::put):
Remove direct dependency from ICU library (and types), moving that dependency into
new {open,close}LineBreakIterator() functions (defined in TextBreakIteratorICU.cpp).
Update to take line break mode into account.
Create (and cache) different break iterators depending on line break mode (in addition to locale),
which entails expanding pool entry key format to optionally append "@break=" +
"loose"|"normal"|"strict" keyword to locale string.

* platform/text/TextBreakIterator.h:
(WebCore::LazyLineBreakIterator::LazyLineBreakIterator):
(WebCore::LazyLineBreakIterator::isLooseCJKMode):
(WebCore::LazyLineBreakIterator::get):
(WebCore::LazyLineBreakIterator::reset):
(LazyLineBreakIterator):
Define LineBreakIteratorMode enumeration for use in TextBreakIterator et al.
Add state member to indicate line break mode.

* platform/text/TextBreakIteratorICU.cpp:
(WebCore::acquireLineBreakIterator):
Use new line break mode when making iterator from pool.
Handle change of return type of LineBreakIteratorPool::take() to non-ICU type,
i.e., TextBreakIterator* instead of ICU's UBreakIterator*.
(WebCore::releaseLineBreakIterator):
Handle change of parameter type of LineBreakIteratorPool::put() to non-ICU type,
i.e., TextBreakIterator* instead of ICU's UBreakIterator*.
(WebCore):
(WebCore::isCJKLocale):
New functions for determining if CJK rules apply.
(WebCore::openLineBreakIterator):
New function for abstracting opening of ICU style line break iterator. This is now
used in LineBreakIteratorPoolICU.h rather than having direct ICU API dependency there.
This function also takes into account the line break mode.
(WebCore::closeLineBreakIterator):
(WebCore::mapLineIteratorModeToRules):
New function for abstracting closing of ICU style line break iterator. This is now
used in LineBreakIteratorPoolICU.h rather than having direct ICU API dependency there.

* rendering/RenderBlockLineLayout.cpp:
(WebCore::RenderBlock::LineBreaker::nextSegmentBreak):
Pass line break iterator mode flag when reseting LazyLineBreakIterator.
Add looseMode local variable to prevent need for computing under isBreakable().

* rendering/RenderText.cpp:
(WebCore::mapLineBreakToIteratorMode):
Add implementation for mapLineBreakToIteratorMode(), used by both RenderText::computePreferredLogicalWidths
and RenderBlock::LineBreaker::nextLineBreak.
(WebCore):
(WebCore::RenderText::computePreferredLogicalWidths):
Ensure (lazy line) breakIterator is initialized for line break mode.
Ensure isBreakable() is passed loose mode flag to match behavior in RenderBlock::LineBreaker::nextLineBreak.

* rendering/RenderText.h:
(WebCore):
Add declaration for mapLineBreakToIteratorMode(), used by both RenderText::computePreferredLogicalWidths
and RenderBlock::LineBreaker::nextLineBreak.

* rendering/break_lines.cpp:
(WebCore):
Introduce (local) enum NBSPBehavior for expanding template on nextBreakablePosition.
(WebCore::isBreakableSpace):
Add externally specified loose mode parameter to prevent need to invoke line break iterator
accessor method on each invocation. Use new loose mode flavors off NBP functions.
(WebCore::needsLineBreakIterator):
Use enum NBSP behavior template parameter rather than boolean.
(WebCore::nextBreakablePositionNonLoosely):
Extend name to distinguish from loose flavor of this function.
(WebCore::nextBreakablePositionLoosely):
Add loose flavor of NBP invoked only when loose mode applies, in which case ASCII shortcut
table cannot be used.
(WebCore::nextBreakablePosition):
(WebCore::nextBreakablePositionIgnoringNBSP):
Use (renamed) non-loose flavor of NBP.
(WebCore::nextBreakablePositionLoose):
(WebCore::nextBreakablePositionIgnoringNBSPLoose):
Introduce loose flavor of NBP template expansions.

* rendering/break_lines.h:
(WebCore):
(WebCore::isBreakable):
Add externally specified loose mode parameter to prevent need to invoke line break iterator
accessor method on each invocation.

LayoutTests: CSS3: line-break property support
https://bugs.webkit.org/show_bug.cgi?id=89235

Reviewed by Eric Seidel.

* platform/mac/TestExpectations: Mark css3/line-break tests as passing.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@144019 268f45cc-cd09-0410-ab3c-d52691b4dbfc