139 lines
5.0 KiB
C++
139 lines
5.0 KiB
C++
/*
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* Copyright (C) 2009 Google Inc. All rights reserved.
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* Copyright (C) 2011 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "RenderRubyText.h"
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#include "RenderRubyRun.h"
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#include <wtf/IsoMallocInlines.h>
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namespace WebCore {
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WTF_MAKE_ISO_ALLOCATED_IMPL(RenderRubyText);
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RenderRubyText::RenderRubyText(Element& element, RenderStyle&& style)
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: RenderBlockFlow(element, WTFMove(style))
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{
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}
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RenderRubyText::~RenderRubyText() = default;
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RenderRubyRun* RenderRubyText::rubyRun() const
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{
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ASSERT(parent());
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return downcast<RenderRubyRun>(parent());
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}
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bool RenderRubyText::isChildAllowed(const RenderObject& child, const RenderStyle&) const
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{
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return child.isInline();
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}
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std::optional<TextAlignMode> RenderRubyText::overrideTextAlignmentForLine(bool) const
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{
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TextAlignMode textAlign = style().textAlign();
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// FIXME: This check is bogus since user can set the initial value.
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if (textAlign != RenderStyle::initialTextAlign())
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return { };
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// The default behavior is to allow ruby text to expand if it is shorter than the ruby base.
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return TextAlignMode::Justify;
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}
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void RenderRubyText::adjustInlineDirectionLineBounds(int expansionOpportunityCount, float& logicalLeft, float& logicalWidth) const
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{
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TextAlignMode textAlign = style().textAlign();
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// FIXME: This check is bogus since user can set the initial value.
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if (textAlign != RenderStyle::initialTextAlign())
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return RenderBlockFlow::adjustInlineDirectionLineBounds(expansionOpportunityCount, logicalLeft, logicalWidth);
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int maxPreferredLogicalWidth = this->maxPreferredLogicalWidth();
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if (maxPreferredLogicalWidth >= logicalWidth)
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return;
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// Inset the ruby text by half the inter-ideograph expansion amount, but no more than a full-width
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// ruby character on each side.
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float inset = (logicalWidth - maxPreferredLogicalWidth) / (expansionOpportunityCount + 1);
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if (expansionOpportunityCount)
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inset = std::min<float>(2 * style().computedFontPixelSize(), inset);
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logicalLeft += inset / 2;
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logicalWidth -= inset;
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}
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bool RenderRubyText::avoidsFloats() const
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{
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return true;
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}
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bool RenderRubyText::canBreakBefore(const LazyLineBreakIterator& iterator) const
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{
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// FIXME: It would be nice to improve this so that it isn't just hard-coded, but lookahead in this
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// case is particularly problematic.
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if (!iterator.priorContextLength())
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return true;
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UChar ch = iterator.lastCharacter();
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ULineBreak lineBreak = (ULineBreak)u_getIntPropertyValue(ch, UCHAR_LINE_BREAK);
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// UNICODE LINE BREAKING ALGORITHM
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// http://www.unicode.org/reports/tr14/
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// And Requirements for Japanese Text Layout, 3.1.7 Characters Not Starting a Line
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// http://www.w3.org/TR/2012/NOTE-jlreq-20120403/#characters_not_starting_a_line
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switch (lineBreak) {
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case U_LB_NONSTARTER:
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case U_LB_CLOSE_PARENTHESIS:
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case U_LB_CLOSE_PUNCTUATION:
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case U_LB_EXCLAMATION:
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case U_LB_BREAK_SYMBOLS:
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case U_LB_INFIX_NUMERIC:
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case U_LB_ZWSPACE:
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case U_LB_WORD_JOINER:
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return false;
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default:
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break;
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}
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// Special care for Requirements for Japanese Text Layout
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switch (ch) {
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case 0x2019: // RIGHT SINGLE QUOTATION MARK
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case 0x201D: // RIGHT DOUBLE QUOTATION MARK
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case 0x00BB: // RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK
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case 0x2010: // HYPHEN
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case 0x2013: // EN DASH
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case 0x300C: // LEFT CORNER BRACKET
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return false;
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default:
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break;
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}
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return true;
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}
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} // namespace WebCore
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