1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
/*
* Copyright (C) 2009 Alex Milowski (alex@milowski.com). All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* 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"
#if ENABLE(MATHML)
#include "RenderMathMLFenced.h"
#include "FontSelector.h"
#include "MathMLNames.h"
#include "RenderInline.h"
#include "RenderMathMLOperator.h"
#include "RenderText.h"
#include <wtf/text/StringBuilder.h>
namespace WebCore {
using namespace MathMLNames;
enum Braces { OpeningBraceChar = 0x28, ClosingBraceChar = 0x29 };
static const float gSeparatorMarginEndEms = 0.25f;
static const float gFenceMarginEms = 0.1f;
RenderMathMLFenced::RenderMathMLFenced(Element* element)
: RenderMathMLRow(element)
, m_open(OpeningBraceChar)
, m_close(ClosingBraceChar)
, m_closeFenceRenderer(0)
{
}
void RenderMathMLFenced::updateFromElement()
{
Element* fenced = toElement(node());
// FIXME: Handle open/close values with more than one character (they should be treated like text).
AtomicString openValue = fenced->getAttribute(MathMLNames::openAttr);
if (openValue.length() > 0)
m_open = openValue[0];
AtomicString closeValue = fenced->getAttribute(MathMLNames::closeAttr);
if (closeValue.length() > 0)
m_close = closeValue[0];
AtomicString separators = fenced->getAttribute(MathMLNames::separatorsAttr);
if (!separators.isNull()) {
StringBuilder characters;
for (unsigned int i = 0; i < separators.length(); i++) {
if (!isSpaceOrNewline(separators[i]))
characters.append(separators[i]);
}
m_separators = !characters.length() ? 0 : characters.toString().impl();
} else {
// The separator defaults to a single comma.
m_separators = StringImpl::create(",");
}
if (isEmpty())
makeFences();
}
RenderMathMLOperator* RenderMathMLFenced::createMathMLOperator(UChar uChar, RenderMathMLOperator::OperatorType operatorType)
{
RefPtr<RenderStyle> newStyle = RenderStyle::createAnonymousStyleWithDisplay(style(), FLEX);
newStyle->setFlexDirection(FlowColumn);
newStyle->setMarginEnd(Length((operatorType == RenderMathMLOperator::Fence ? gFenceMarginEms : gSeparatorMarginEndEms) * style()->fontSize(), Fixed));
if (operatorType == RenderMathMLOperator::Fence)
newStyle->setMarginStart(Length(gFenceMarginEms * style()->fontSize(), Fixed));
RenderMathMLOperator* newOperator = new (renderArena()) RenderMathMLOperator(toElement(node()), uChar);
newOperator->setOperatorType(operatorType);
newOperator->setStyle(newStyle.release());
return newOperator;
}
void RenderMathMLFenced::makeFences()
{
RenderMathMLRow::addChild(createMathMLOperator(m_open, RenderMathMLOperator::Fence), firstChild());
m_closeFenceRenderer = createMathMLOperator(m_close, RenderMathMLOperator::Fence);
RenderMathMLRow::addChild(m_closeFenceRenderer);
}
void RenderMathMLFenced::addChild(RenderObject* child, RenderObject* beforeChild)
{
// make the fences if the render object is empty
if (isEmpty())
updateFromElement();
// FIXME: Adding or removing a child should possibly cause all later separators to shift places if they're different,
// as later child positions change by +1 or -1.
RenderObject* separatorRenderer = 0;
if (m_separators.get()) {
unsigned int count = 0;
for (Node* position = child->node(); position; position = position->previousSibling()) {
if (position->isElementNode())
count++;
}
if (!beforeChild) {
// We're adding at the end (before the closing fence), so a new separator would go before the new child, not after it.
--count;
}
// |count| is now the number of element children that will be before our new separator, i.e. it's the 1-based index of the separator.
if (count > 0) {
UChar separator;
// Use the last separator if we've run out of specified separators.
if (count > m_separators.get()->length())
separator = (*m_separators.get())[m_separators.get()->length() - 1];
else
separator = (*m_separators.get())[count - 1];
separatorRenderer = createMathMLOperator(separator, RenderMathMLOperator::Separator);
}
}
if (beforeChild) {
// Adding |x| before an existing |y| e.g. in element (y) - first insert our new child |x|, then its separator, to get (x, y).
RenderMathMLRow::addChild(child, beforeChild);
if (separatorRenderer)
RenderMathMLRow::addChild(separatorRenderer, beforeChild);
} else {
// Adding |y| at the end of an existing element e.g. (x) - insert the separator first before the closing fence, then |y|, to get (x, y).
if (separatorRenderer)
RenderMathMLRow::addChild(separatorRenderer, m_closeFenceRenderer);
RenderMathMLRow::addChild(child, m_closeFenceRenderer);
}
}
// FIXME: Change createMathMLOperator() above to create an isAnonymous() operator, and remove this styleDidChange() function.
void RenderMathMLFenced::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
{
RenderMathMLBlock::styleDidChange(diff, oldStyle);
for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {
if (child->node() == node()) {
ASSERT(child->style()->refCount() == 1);
child->style()->inheritFrom(style());
bool isFence = child == firstChild() || child == lastChild();
child->style()->setMarginEnd(Length((isFence ? gFenceMarginEms : gSeparatorMarginEndEms) * style()->fontSize(), Fixed));
if (isFence)
child->style()->setMarginStart(Length(gFenceMarginEms * style()->fontSize(), Fixed));
}
}
}
}
#endif
|
