| /* |
| * 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) |
| { |
| InlineIterator iter(root, |
| firstRenderObjectForDirectionalityDetermination(root, current), pos); |
| 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 |