1 /*
2 * Copyright (C) 2009 Alex Milowski (alex@milowski.com). All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
14 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
15 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
16 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
17 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
18 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
19 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include "config.h"
27
28 #if ENABLE(MATHML)
29
30 #include "RenderMathMLFenced.h"
31
32 #include "FontSelector.h"
33 #include "MathMLNames.h"
34 #include "RenderInline.h"
35 #include "RenderMathMLOperator.h"
36 #include "RenderText.h"
37
38 namespace WebCore {
39
40 using namespace MathMLNames;
41
42 enum Braces { OpeningBraceChar = 0x28, ClosingBraceChar = 0x29 };
43
44 static const float gOperatorPadding = 0.1f;
45
RenderMathMLFenced(Node * fenced)46 RenderMathMLFenced::RenderMathMLFenced(Node* fenced)
47 : RenderMathMLRow(fenced)
48 , m_open(OpeningBraceChar)
49 , m_close(ClosingBraceChar)
50 {
51 }
52
updateFromElement()53 void RenderMathMLFenced::updateFromElement()
54 {
55 Element* fenced = static_cast<Element*>(node());
56
57 // FIXME: Handle open/close values with more than one character (they should be treated like text).
58 AtomicString openValue = fenced->getAttribute(MathMLNames::openAttr);
59 if (openValue.length() > 0)
60 m_open = openValue[0];
61 AtomicString closeValue = fenced->getAttribute(MathMLNames::closeAttr);
62 if (closeValue.length() > 0)
63 m_close = closeValue[0];
64
65 AtomicString separators = static_cast<Element*>(fenced)->getAttribute(MathMLNames::separatorsAttr);
66 if (!separators.isNull()) {
67 Vector<UChar> characters;
68 for (unsigned int i = 0; i < separators.length(); i++) {
69 if (!isSpaceOrNewline(separators[i]))
70 characters.append(separators[i]);
71 }
72 m_separators = !characters.size() ? 0 : StringImpl::create(characters.data() , characters.size());
73 } else {
74 // The separator defaults to a single comma.
75 m_separators = StringImpl::create(",");
76 }
77
78 if (isEmpty())
79 makeFences();
80 }
81
makeOperatorStyle()82 RefPtr<RenderStyle> RenderMathMLFenced::makeOperatorStyle()
83 {
84 RefPtr<RenderStyle> newStyle = RenderStyle::create();
85 newStyle->inheritFrom(style());
86 newStyle->setDisplay(INLINE_BLOCK);
87 newStyle->setPaddingRight(Length(static_cast<int>(gOperatorPadding * style()->fontSize()), Fixed));
88 return newStyle;
89 }
90
makeFences()91 void RenderMathMLFenced::makeFences()
92 {
93 RenderObject* openFence = new (renderArena()) RenderMathMLOperator(node(), m_open);
94 openFence->setStyle(makeOperatorStyle().release());
95 RenderBlock::addChild(openFence, firstChild());
96 RenderObject* closeFence = new (renderArena()) RenderMathMLOperator(node(), m_close);
97 closeFence->setStyle(makeOperatorStyle().release());
98 RenderBlock::addChild(closeFence);
99 }
100
addChild(RenderObject * child,RenderObject *)101 void RenderMathMLFenced::addChild(RenderObject* child, RenderObject*)
102 {
103 // make the fences if the render object is empty
104 if (isEmpty())
105 updateFromElement();
106
107 if (m_separators.get()) {
108 unsigned int count = 0;
109 for (Node* position = child->node(); position; position = position->previousSibling()) {
110 if (position->nodeType() == Node::ELEMENT_NODE)
111 count++;
112 }
113
114 if (count > 1) {
115 UChar separator;
116
117 // Use the last separator if we've run out of specified separators.
118 if ((count - 1) >= m_separators.get()->length())
119 separator = (*m_separators.get())[m_separators.get()->length() - 1];
120 else
121 separator = (*m_separators.get())[count - 1];
122
123 RenderObject* separatorObj = new (renderArena()) RenderMathMLOperator(node(), separator);
124 separatorObj->setStyle(makeOperatorStyle().release());
125 RenderBlock::addChild(separatorObj, lastChild());
126 }
127 }
128
129 // If we have a block, we'll wrap it in an inline-block.
130 if (child->isBlockFlow() && child->style()->display() != INLINE_BLOCK) {
131 // Block objects wrapper.
132
133 RenderBlock* block = new (renderArena()) RenderBlock(node());
134 RefPtr<RenderStyle> newStyle = RenderStyle::create();
135 newStyle->inheritFrom(style());
136 newStyle->setDisplay(INLINE_BLOCK);
137 block->setStyle(newStyle.release());
138
139 RenderBlock::addChild(block, lastChild());
140 block->addChild(child);
141 } else
142 RenderBlock::addChild(child, lastChild());
143 }
144
145 }
146
147 #endif
148