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/*
* Copyright (C) 2000 Lars Knoll (knoll@kde.org)
* Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc.
* All right reserved.
* Copyright (C) 2010 Google Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef BidiRunForLine_h
#define BidiRunForLine_h
#include "config.h"
#include "core/rendering/BidiRunForLine.h"
#include "core/rendering/InlineIterator.h"
namespace blink {
using namespace WTF::Unicode;
static RenderObject* firstRenderObjectForDirectionalityDetermination(
RenderObject* root, RenderObject* current = 0)
{
RenderObject* next = current;
while (current) {
if (isIsolated(current->style()->unicodeBidi())
&& (current->isRenderInline() || current->isRenderBlock())) {
if (current != root)
current = 0;
else
current = next;
break;
}
current = current->parent();
}
if (!current)
current = root->slowFirstChild();
while (current) {
next = 0;
if (isIteratorTarget(current) && !(current->isText()
&& toRenderText(current)->isAllCollapsibleWhitespace()))
break;
if (!isIteratorTarget(current)
&& !isIsolated(current->style()->unicodeBidi()))
next = current->slowFirstChild();
if (!next) {
while (current && current != root) {
next = current->nextSibling();
if (next)
break;
current = current->parent();
}
}
if (!next)
break;
current = next;
}
return current;
}
TextDirection determinePlaintextDirectionality(RenderObject* root,
RenderObject* current = 0, unsigned pos = 0)
{
RenderObject* firstRenderObject = firstRenderObjectForDirectionalityDetermination(root, current);
InlineIterator iter(root, firstRenderObject, firstRenderObject == current ? pos : 0);
InlineBidiResolver observer;
observer.setStatus(BidiStatus(root->style()->direction(),
isOverride(root->style()->unicodeBidi())));
observer.setPositionIgnoringNestedIsolates(iter);
return observer.determineParagraphDirectionality();
}
// FIXME: This should be a BidiStatus constructor or create method.
static inline BidiStatus statusWithDirection(TextDirection textDirection,
bool isOverride)
{
WTF::Unicode::Direction direction = textDirection == LTR
? LeftToRight
: RightToLeft;
RefPtr<BidiContext> context = BidiContext::create(
textDirection == LTR ? 0 : 1, direction, isOverride, FromStyleOrDOM);
// This copies BidiStatus and may churn the ref on BidiContext.
// I doubt it matters.
return BidiStatus(direction, direction, direction, context.release());
}
static inline void setupResolverToResumeInIsolate(InlineBidiResolver& resolver,
RenderObject* root, RenderObject* startObject)
{
if (root != startObject) {
RenderObject* parent = startObject->parent();
setupResolverToResumeInIsolate(resolver, root, parent);
notifyObserverEnteredObject(&resolver, startObject);
}
}
static void restoreIsolatedMidpointStates(InlineBidiResolver& topResolver,
InlineBidiResolver& isolatedResolver)
{
while (!isolatedResolver.isolatedRuns().isEmpty()) {
BidiRun* run = isolatedResolver.isolatedRuns().last();
isolatedResolver.isolatedRuns().removeLast();
topResolver.setMidpointStateForIsolatedRun(run,
isolatedResolver.midpointStateForIsolatedRun(run));
}
}
void constructBidiRunsForLine(InlineBidiResolver& topResolver,
BidiRunList<BidiRun>& bidiRuns, const InlineIterator& endOfLine,
VisualDirectionOverride override, bool previousLineBrokeCleanly,
bool isNewUBAParagraph)
{
// FIXME: We should pass a BidiRunList into createBidiRunsForLine instead
// of the resolver owning the runs.
ASSERT(&topResolver.runs() == &bidiRuns);
ASSERT(topResolver.position() != endOfLine);
RenderObject* currentRoot = topResolver.position().root();
topResolver.createBidiRunsForLine(endOfLine, override,
previousLineBrokeCleanly);
while (!topResolver.isolatedRuns().isEmpty()) {
// It does not matter which order we resolve the runs as long as we
// resolve them all.
BidiRun* isolatedRun = topResolver.isolatedRuns().last();
topResolver.isolatedRuns().removeLast();
RenderObject* startObj = isolatedRun->object();
// Only inlines make sense with unicode-bidi: isolate (blocks are
// already isolated).
// FIXME: Because enterIsolate is not passed a RenderObject, we have to
// crawl up the tree to see which parent inline is the isolate. We could
// change enterIsolate to take a RenderObject and do this logic there,
// but that would be a layering violation for BidiResolver (which knows
// nothing about RenderObject).
RenderInline* isolatedInline = toRenderInline(
highestContainingIsolateWithinRoot(startObj, currentRoot));
ASSERT(isolatedInline);
InlineBidiResolver isolatedResolver;
LineMidpointState& isolatedLineMidpointState =
isolatedResolver.midpointState();
isolatedLineMidpointState = topResolver.midpointStateForIsolatedRun(
isolatedRun);
EUnicodeBidi unicodeBidi = isolatedInline->style()->unicodeBidi();
TextDirection direction;
if (unicodeBidi == Plaintext) {
direction = determinePlaintextDirectionality(isolatedInline,
isNewUBAParagraph ? startObj : 0);
} else {
ASSERT(unicodeBidi == Isolate || unicodeBidi == IsolateOverride);
direction = isolatedInline->style()->direction();
}
isolatedResolver.setStatus(statusWithDirection(direction,
isOverride(unicodeBidi)));
setupResolverToResumeInIsolate(isolatedResolver, isolatedInline,
startObj);
// The starting position is the beginning of the first run within the
// isolate that was identified during the earlier call to
// createBidiRunsForLine. This can be but is not necessarily the first
// run within the isolate.
InlineIterator iter = InlineIterator(isolatedInline, startObj,
isolatedRun->m_start);
isolatedResolver.setPositionIgnoringNestedIsolates(iter);
// We stop at the next end of line; we may re-enter this isolate in the
// next call to constructBidiRuns().
// FIXME: What should end and previousLineBrokeCleanly be?
// rniwa says previousLineBrokeCleanly is just a WinIE hack and could
// always be false here?
isolatedResolver.createBidiRunsForLine(endOfLine, NoVisualOverride,
previousLineBrokeCleanly);
ASSERT(isolatedResolver.runs().runCount());
if (isolatedResolver.runs().runCount())
bidiRuns.replaceRunWithRuns(isolatedRun, isolatedResolver.runs());
// If we encountered any nested isolate runs, just move them
// to the top resolver's list for later processing.
if (!isolatedResolver.isolatedRuns().isEmpty()) {
topResolver.isolatedRuns().appendVector(
isolatedResolver.isolatedRuns());
currentRoot = isolatedInline;
restoreIsolatedMidpointStates(topResolver, isolatedResolver);
}
}
}
} // namespace blink
#endif // BidiRunForLine_h
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