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/*
* 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;
static const char* gOpeningBraceChar = "(";
static const char* gClosingBraceChar = ")";
RenderMathMLFenced::RenderMathMLFenced(MathMLInlineContainerElement& element, Ref<RenderStyle>&& style)
: RenderMathMLRow(element, WTFMove(style))
, m_closeFenceRenderer(nullptr)
{
}
void RenderMathMLFenced::updateFromElement()
{
const auto& fenced = element();
// The open operator defaults to a left parenthesis.
AtomicString open = fenced.fastGetAttribute(MathMLNames::openAttr);
m_open = open.isNull() ? gOpeningBraceChar : open;
// The close operator defaults to a right parenthesis.
AtomicString close = fenced.fastGetAttribute(MathMLNames::closeAttr);
m_close = close.isNull() ? gClosingBraceChar : close;
AtomicString separators = fenced.fastGetAttribute(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();
else {
// FIXME: The mfenced element fails to update dynamically when its open, close and separators attributes are changed (https://bugs.webkit.org/show_bug.cgi?id=57696).
downcast<RenderMathMLOperator>(*firstChild()).updateTokenContent(m_open);
m_closeFenceRenderer->updateTokenContent(m_close);
}
}
RenderPtr<RenderMathMLOperator> RenderMathMLFenced::createMathMLOperator(const String& operatorString, MathMLOperatorDictionary::Form form, MathMLOperatorDictionary::Flag flag)
{
RenderPtr<RenderMathMLOperator> newOperator = createRenderer<RenderMathMLOperator>(document(), RenderStyle::createAnonymousStyleWithDisplay(&style(), FLEX), operatorString, form, flag);
newOperator->initializeStyle();
return newOperator;
}
void RenderMathMLFenced::makeFences()
{
RenderPtr<RenderMathMLOperator> openFence = createMathMLOperator(m_open, MathMLOperatorDictionary::Prefix, MathMLOperatorDictionary::Fence);
RenderMathMLRow::addChild(openFence.leakPtr(), firstChild());
RenderPtr<RenderMathMLOperator> closeFence = createMathMLOperator(m_close, MathMLOperatorDictionary::Postfix, MathMLOperatorDictionary::Fence);
m_closeFenceRenderer = closeFence.get();
RenderMathMLRow::addChild(closeFence.leakPtr());
}
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. This should also handle surrogate pairs. See https://bugs.webkit.org/show_bug.cgi?id=125938.
RenderPtr<RenderMathMLOperator> separatorRenderer;
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];
StringBuilder builder;
builder.append(separator);
separatorRenderer = createMathMLOperator(builder.toString(), MathMLOperatorDictionary::Infix, MathMLOperatorDictionary::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.leakPtr(), 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.leakPtr(), m_closeFenceRenderer);
RenderMathMLRow::addChild(child, m_closeFenceRenderer);
}
}
}
#endif
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