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/*
* Copyright (C) 2009 Google Inc. All rights reserved.
* Copyright (C) 2011-2023 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "RenderRubyText.h"
#include "RenderBoxModelObjectInlines.h"
#include "RenderRubyRun.h"
#include "RenderStyleInlines.h"
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(RenderRubyText);
RenderRubyText::RenderRubyText(Element& element, RenderStyle&& style)
: RenderBlockFlow(element, WTFMove(style))
{
}
RenderRubyText::~RenderRubyText() = default;
RenderRubyRun* RenderRubyText::rubyRun() const
{
ASSERT(parent());
return downcast<RenderRubyRun>(parent());
}
bool RenderRubyText::isChildAllowed(const RenderObject& child, const RenderStyle&) const
{
return child.isInline();
}
std::optional<TextAlignMode> RenderRubyText::overrideTextAlignmentForLine(bool) const
{
// FIXME: This check is bogus since user can set the initial value.
if (style().textAlign() != TextAlignMode::Start)
return { };
// The default behavior is to allow ruby text to expand if it is shorter than the ruby base.
return TextAlignMode::Justify;
}
void RenderRubyText::adjustInlineDirectionLineBounds(int expansionOpportunityCount, float& logicalLeft, float& logicalWidth) const
{
// FIXME: This check is bogus since user can set the initial value.
if (style().textAlign() != TextAlignMode::Start)
return RenderBlockFlow::adjustInlineDirectionLineBounds(expansionOpportunityCount, logicalLeft, logicalWidth);
auto maxPreferredLogicalWidth = this->maxPreferredLogicalWidth();
if (maxPreferredLogicalWidth >= logicalWidth)
return;
// Inset the ruby text by half the inter-ideograph expansion amount, but no more than a full-width
// ruby character on each side.
float inset = (logicalWidth - maxPreferredLogicalWidth) / (expansionOpportunityCount + 1);
if (expansionOpportunityCount)
inset = std::min(2 * style().computedFontSize(), inset);
logicalLeft += inset / 2;
logicalWidth -= inset;
}
bool RenderRubyText::avoidsFloats() const
{
return true;
}
bool RenderRubyText::canBreakBefore(const CachedLineBreakIteratorFactory& lineBreakIteratorFactory) const
{
// FIXME: It would be nice to improve this so that it isn't just hard-coded, but lookahead in this
// case is particularly problematic.
if (!lineBreakIteratorFactory.priorContext().length())
return true;
UChar ch = lineBreakIteratorFactory.priorContext().lastCharacter();
ULineBreak lineBreak = (ULineBreak)u_getIntPropertyValue(ch, UCHAR_LINE_BREAK);
// UNICODE LINE BREAKING ALGORITHM
// http://www.unicode.org/reports/tr14/
// And Requirements for Japanese Text Layout, 3.1.7 Characters Not Starting a Line
// http://www.w3.org/TR/2012/NOTE-jlreq-20120403/#characters_not_starting_a_line
switch (lineBreak) {
case U_LB_NONSTARTER:
case U_LB_CLOSE_PARENTHESIS:
case U_LB_CLOSE_PUNCTUATION:
case U_LB_EXCLAMATION:
case U_LB_BREAK_SYMBOLS:
case U_LB_INFIX_NUMERIC:
case U_LB_ZWSPACE:
case U_LB_WORD_JOINER:
return false;
default:
break;
}
// Special care for Requirements for Japanese Text Layout
switch (ch) {
case 0x2019: // RIGHT SINGLE QUOTATION MARK
case 0x201D: // RIGHT DOUBLE QUOTATION MARK
case 0x00BB: // RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK
case 0x2010: // HYPHEN
case 0x2013: // EN DASH
case 0x300C: // LEFT CORNER BRACKET
return false;
default:
break;
}
return true;
}
} // namespace WebCore
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