Imported QtWebKit TP3 (git b57bc6801f1876c3220d5a4bfea33d620d477443)

Change-Id: I3b1d8a2808782c9f34d50240000e20cb38d3680f
Reviewed-by: Konstantin Tokarev <annulen@yandex.ru>

1 files changed, 245 insertions, 0 deletions

diff --git a/Source/WebCore/mathml/MathMLSelectElement.cpp b/Source/WebCore/mathml/MathMLSelectElement.cpp
new file mode 100644
index 000000000..1226a36d4
--- /dev/null
+++ b/Source/WebCore/mathml/MathMLSelectElement.cpp
@@ -0,0 +1,245 @@
+/*
+ * Copyright (C) 2013 The MathJax Consortium. 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"
+#include "MathMLSelectElement.h"
+
+#if ENABLE(MATHML)
+
+#include "Event.h"
+#include "HTMLElement.h"
+#include "HTMLNames.h"
+#include "MathMLNames.h"
+#include "RenderMathMLRow.h"
+#include "SVGElement.h"
+#include "SVGNames.h"
+#include "StyleTreeResolver.h"
+
+namespace WebCore {
+
+using namespace MathMLNames;
+
+MathMLSelectElement::MathMLSelectElement(const QualifiedName& tagName, Document& document)
+    : MathMLInlineContainerElement(tagName, document)
+    , m_selectedChild(nullptr)
+{
+}
+
+Ref<MathMLSelectElement> MathMLSelectElement::create(const QualifiedName& tagName, Document& document)
+{
+    return adoptRef(*new MathMLSelectElement(tagName, document));
+}
+
+RenderPtr<RenderElement> MathMLSelectElement::createElementRenderer(Ref<RenderStyle>&& style, const RenderTreePosition&)
+{
+    return createRenderer<RenderMathMLRow>(*this, WTFMove(style));
+}
+
+//  We recognize the following values for the encoding attribute of the <semantics> element:
+//
+// - "MathML-Presentation", which is mentioned in the MathML 3 recommendation.
+// - "SVG1.1" which is mentioned in the W3C note.
+//   http://www.w3.org/Math/Documents/Notes/graphics.xml
+// - Other MIME Content-Types for MathML, SVG and HTML.
+//
+// We exclude "application/mathml+xml" which is ambiguous about whether it is Presentation or Content MathML. Authors must use a more explicit encoding value.
+bool MathMLSelectElement::isMathMLEncoding(const AtomicString& value)
+{
+    return value == "application/mathml-presentation+xml" || value == "MathML-Presentation";
+}
+
+bool MathMLSelectElement::isSVGEncoding(const AtomicString& value)
+{
+    return value == "image/svg+xml" || value == "SVG1.1";
+}
+
+bool MathMLSelectElement::isHTMLEncoding(const AtomicString& value)
+{
+    return value == "application/xhtml+xml" || value == "text/html";
+}
+
+bool MathMLSelectElement::childShouldCreateRenderer(const Node& child) const
+{
+    return MathMLElement::childShouldCreateRenderer(child) && m_selectedChild == &child;
+}
+
+void MathMLSelectElement::finishParsingChildren()
+{
+    updateSelectedChild();
+    MathMLInlineContainerElement::finishParsingChildren();
+}
+
+void MathMLSelectElement::childrenChanged(const ChildChange& change)
+{
+    updateSelectedChild();
+    MathMLInlineContainerElement::childrenChanged(change);
+}
+
+void MathMLSelectElement::attributeChanged(const QualifiedName& name, const AtomicString& oldValue, const AtomicString& newValue, AttributeModificationReason reason)
+{
+    if (hasTagName(mactionTag) && (name == MathMLNames::actiontypeAttr || name == MathMLNames::selectionAttr))
+        updateSelectedChild();
+
+    MathMLInlineContainerElement::attributeChanged(name, oldValue, newValue, reason);
+}
+
+int MathMLSelectElement::getSelectedActionChildAndIndex(Element*& selectedChild)
+{
+    ASSERT(hasTagName(mactionTag));
+
+    // We "round up or down to the closest allowable value" of the selection attribute, as suggested by the MathML specification.
+    selectedChild = firstElementChild();
+    if (!selectedChild)
+        return 1;
+
+    int selection = fastGetAttribute(MathMLNames::selectionAttr).toInt();
+    int i;
+    for (i = 1; i < selection; i++) {
+        Element* nextChild = selectedChild->nextElementSibling();
+        if (!nextChild)
+            break;
+        selectedChild = nextChild;
+    }
+
+    return i;
+}
+
+Element* MathMLSelectElement::getSelectedActionChild()
+{
+    ASSERT(hasTagName(mactionTag));
+
+    Element* child = firstElementChild();
+    if (!child)
+        return child;
+
+    // The value of the actiontype attribute is case-sensitive.
+    const AtomicString& actiontype = fastGetAttribute(MathMLNames::actiontypeAttr);
+    if (actiontype == "statusline")
+        // FIXME: implement user interaction for the "statusline" action type (http://wkbug/124922).
+        { }
+    else if (actiontype == "tooltip")
+        // FIXME: implement user interaction for the "tooltip" action type (http://wkbug/124921).
+        { }
+    else {
+        // For the "toggle" action type or any unknown action type, we rely on the value of the selection attribute to determine the visible child.
+        getSelectedActionChildAndIndex(child);
+    }
+
+    return child;
+}
+
+Element* MathMLSelectElement::getSelectedSemanticsChild()
+{
+    ASSERT(hasTagName(semanticsTag));
+
+    Element* child = firstElementChild();
+    if (!child)
+        return nullptr;
+
+    if (!is<MathMLElement>(*child) || !downcast<MathMLElement>(*child).isPresentationMathML()) {
+        // The first child is not a presentation MathML element. Hence we move to the second child and start searching an annotation child that could be displayed.
+        child = child->nextElementSibling();
+    } else if (!downcast<MathMLElement>(*child).isSemanticAnnotation()) {
+        // The first child is a presentation MathML but not an annotation, so we can just display it.
+        return child;
+    }
+    // Otherwise, the first child is an <annotation> or <annotation-xml> element. This is invalid, but some people use this syntax so we take care of this case too and start the search from this first child.
+
+    for ( ; child; child = child->nextElementSibling()) {
+        if (!is<MathMLElement>(*child))
+            continue;
+
+        if (child->hasTagName(MathMLNames::annotationTag)) {
+            // If the <annotation> element has an src attribute then it is a reference to arbitrary binary data and it is not clear whether we can display it. Hence we just ignore the annotation.
+            if (child->hasAttribute(MathMLNames::srcAttr))
+                continue;
+            // Otherwise, we assume it is a text annotation that can always be displayed and we stop here.
+            return child;
+        }
+
+        if (child->hasTagName(MathMLNames::annotation_xmlTag)) {
+            // If the <annotation-xml> element has an src attribute then it is a reference to arbitrary binary data and it is not clear whether we can display it. Hence we just ignore the annotation.
+            if (child->hasAttribute(MathMLNames::srcAttr))
+                continue;
+            // If the <annotation-xml> element has an encoding attribute describing presentation MathML, SVG or HTML we assume the content can be displayed and we stop here.
+            const AtomicString& value = child->fastGetAttribute(MathMLNames::encodingAttr);
+            if (isMathMLEncoding(value) || isSVGEncoding(value) || isHTMLEncoding(value))
+                return child;
+        }
+    }
+
+    // We fallback to the first child.
+    return firstElementChild();
+}
+
+void MathMLSelectElement::updateSelectedChild()
+{
+    Element* newSelectedChild = hasTagName(mactionTag) ? getSelectedActionChild() : getSelectedSemanticsChild();
+
+    if (m_selectedChild == newSelectedChild)
+        return;
+
+    if (m_selectedChild && m_selectedChild->renderer())
+        Style::detachRenderTree(*m_selectedChild);
+
+    m_selectedChild = newSelectedChild;
+    setNeedsStyleRecalc();
+}
+
+void MathMLSelectElement::defaultEventHandler(Event* event)
+{
+    if (event->type() == eventNames().clickEvent) {
+        if (fastGetAttribute(MathMLNames::actiontypeAttr) == "toggle") {
+            toggle();
+            event->setDefaultHandled();
+            return;
+        }
+    }
+
+    MathMLInlineContainerElement::defaultEventHandler(event);
+}
+
+bool MathMLSelectElement::willRespondToMouseClickEvents()
+{
+    return fastGetAttribute(MathMLNames::actiontypeAttr) == "toggle";
+}
+
+void MathMLSelectElement::toggle()
+{
+    // Select the successor of the currently selected child
+    // or the first child if the currently selected child is the last.
+    Element* selectedChild;
+    int newSelectedChildIndex = getSelectedActionChildAndIndex(selectedChild) + 1;
+    if (!selectedChild || !selectedChild->nextElementSibling())
+        newSelectedChildIndex = 1;
+
+    // We update the attribute value of the selection attribute.
+    // This will also call MathMLSelectElement::attributeChanged to update the selected child.
+    setAttribute(MathMLNames::selectionAttr, AtomicString::number(newSelectedChildIndex));
+}
+
+}
+
+#endif // ENABLE(MATHML)