1/*
2 * Copyright (C) 2009 Google Inc. All rights reserved.
3 * Copyright (C) 2011 Apple Inc. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met:
8 *
9 * * Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * * Redistributions in binary form must reproduce the above
12 * copyright notice, this list of conditions and the following disclaimer
13 * in the documentation and/or other materials provided with the
14 * distribution.
15 * * Neither the name of Google Inc. nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include "config.h"
33
34#include "RenderRubyText.h"
35#include "RenderRubyRun.h"
36#include <wtf/IsoMallocInlines.h>
37
38namespace WebCore {
39
40WTF_MAKE_ISO_ALLOCATED_IMPL(RenderRubyText);
41
42RenderRubyText::RenderRubyText(Element& element, RenderStyle&& style)
43 : RenderBlockFlow(element, WTFMove(style))
44{
45}
46
47RenderRubyText::~RenderRubyText() = default;
48
49RenderRubyRun* RenderRubyText::rubyRun() const
50{
51 ASSERT(parent());
52 return downcast<RenderRubyRun>(parent());
53}
54
55bool RenderRubyText::isChildAllowed(const RenderObject& child, const RenderStyle&) const
56{
57 return child.isInline();
58}
59
60TextAlignMode RenderRubyText::textAlignmentForLine(bool endsWithSoftBreak) const
61{
62 TextAlignMode textAlign = style().textAlign();
63 // FIXME: This check is bogus since user can set the initial value.
64 if (textAlign != RenderStyle::initialTextAlign())
65 return RenderBlockFlow::textAlignmentForLine(endsWithSoftBreak);
66
67 // The default behavior is to allow ruby text to expand if it is shorter than the ruby base.
68 return TextAlignMode::Justify;
69}
70
71void RenderRubyText::adjustInlineDirectionLineBounds(int expansionOpportunityCount, float& logicalLeft, float& logicalWidth) const
72{
73 TextAlignMode textAlign = style().textAlign();
74 // FIXME: This check is bogus since user can set the initial value.
75 if (textAlign != RenderStyle::initialTextAlign())
76 return RenderBlockFlow::adjustInlineDirectionLineBounds(expansionOpportunityCount, logicalLeft, logicalWidth);
77
78 int maxPreferredLogicalWidth = this->maxPreferredLogicalWidth();
79 if (maxPreferredLogicalWidth >= logicalWidth)
80 return;
81
82 // Inset the ruby text by half the inter-ideograph expansion amount, but no more than a full-width
83 // ruby character on each side.
84 float inset = (logicalWidth - maxPreferredLogicalWidth) / (expansionOpportunityCount + 1);
85 if (expansionOpportunityCount)
86 inset = std::min<float>(2 * style().computedFontPixelSize(), inset);
87
88 logicalLeft += inset / 2;
89 logicalWidth -= inset;
90}
91
92bool RenderRubyText::avoidsFloats() const
93{
94 return true;
95}
96
97bool RenderRubyText::canBreakBefore(const LazyLineBreakIterator& iterator) const
98{
99 // FIXME: It would be nice to improve this so that it isn't just hard-coded, but lookahead in this
100 // case is particularly problematic.
101
102 if (!iterator.priorContextLength())
103 return true;
104 UChar ch = iterator.lastCharacter();
105 ULineBreak lineBreak = (ULineBreak)u_getIntPropertyValue(ch, UCHAR_LINE_BREAK);
106 // UNICODE LINE BREAKING ALGORITHM
107 // http://www.unicode.org/reports/tr14/
108 // And Requirements for Japanese Text Layout, 3.1.7 Characters Not Starting a Line
109 // http://www.w3.org/TR/2012/NOTE-jlreq-20120403/#characters_not_starting_a_line
110 switch (lineBreak) {
111 case U_LB_NONSTARTER:
112 case U_LB_CLOSE_PARENTHESIS:
113 case U_LB_CLOSE_PUNCTUATION:
114 case U_LB_EXCLAMATION:
115 case U_LB_BREAK_SYMBOLS:
116 case U_LB_INFIX_NUMERIC:
117 case U_LB_ZWSPACE:
118 case U_LB_WORD_JOINER:
119 return false;
120 default:
121 break;
122 }
123 // Special care for Requirements for Japanese Text Layout
124 switch (ch) {
125 case 0x2019: // RIGHT SINGLE QUOTATION MARK
126 case 0x201D: // RIGHT DOUBLE QUOTATION MARK
127 case 0x00BB: // RIGHT-POINTING DOUBLE ANGLE QUOTATION MARK
128 case 0x2010: // HYPHEN
129 case 0x2013: // EN DASH
130 case 0x300C: // LEFT CORNER BRACKET
131 return false;
132 default:
133 break;
134 }
135 return true;
136}
137
138} // namespace WebCore
139