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+/*
+ * Copyright (C) 2016 Igalia S.L. 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 "MathMLStyle.h"
+
+#if ENABLE(MATHML)
+
+#include "MathMLElement.h"
+#include "MathMLNames.h"
+#include "RenderMathMLBlock.h"
+#include "RenderMathMLFraction.h"
+#include "RenderMathMLMath.h"
+#include "RenderMathMLRoot.h"
+#include "RenderMathMLScripts.h"
+#include "RenderMathMLToken.h"
+#include "RenderMathMLUnderOver.h"
+
+namespace WebCore {
+
+using namespace MathMLNames;
+
+Ref<MathMLStyle> MathMLStyle::create()
+{
+ return adoptRef(*new MathMLStyle());
+}
+
+const MathMLStyle* MathMLStyle::getMathMLStyle(RenderObject* renderer)
+{
+ // FIXME: Should we make RenderMathMLTable derive from RenderMathMLBlock in order to simplify this?
+ if (is<RenderMathMLTable>(renderer))
+ return &downcast<RenderMathMLTable>(*renderer).mathMLStyle();
+ if (is<RenderMathMLBlock>(renderer))
+ return &downcast<RenderMathMLBlock>(*renderer).mathMLStyle();
+ return nullptr;
+}
+
+void MathMLStyle::resolveMathMLStyleTree(RenderObject* renderer)
+{
+ for (auto* child = renderer; child; child = child->nextInPreOrder(renderer)) {
+ // FIXME: Should we make RenderMathMLTable derive from RenderMathMLBlock in order to simplify this?
+ if (is<RenderMathMLTable>(child))
+ downcast<RenderMathMLTable>(*child).mathMLStyle().resolveMathMLStyle(child);
+ else if (is<RenderMathMLBlock>(child))
+ downcast<RenderMathMLBlock>(*child).mathMLStyle().resolveMathMLStyle(child);
+ }
+}
+
+RenderObject* MathMLStyle::getMathMLParentNode(RenderObject* renderer)
+{
+ auto* parentRenderer = renderer->parent();
+
+ while (parentRenderer && !(is<RenderMathMLTable>(parentRenderer) || is<RenderMathMLBlock>(parentRenderer)))
+ parentRenderer = parentRenderer->parent();
+
+ return parentRenderer;
+}
+
+void MathMLStyle::updateStyleIfNeeded(RenderObject* renderer, bool oldDisplayStyle, MathMLElement::MathVariant oldMathVariant)
+{
+ if (oldDisplayStyle != m_displayStyle) {
+ renderer->setNeedsLayoutAndPrefWidthsRecalc();
+ if (is<RenderMathMLToken>(renderer))
+ downcast<RenderMathMLToken>(renderer)->updateTokenContent();
+ else if (is<RenderMathMLFraction>(renderer))
+ downcast<RenderMathMLFraction>(renderer)->updateFromElement();
+ }
+ if (oldMathVariant != m_mathVariant) {
+ if (is<RenderMathMLToken>(renderer))
+ downcast<RenderMathMLToken>(renderer)->updateTokenContent();
+ }
+}
+
+void MathMLStyle::resolveMathMLStyle(RenderObject* renderer)
+{
+ ASSERT(renderer);
+
+ bool oldDisplayStyle = m_displayStyle;
+ MathMLElement::MathVariant oldMathVariant = m_mathVariant;
+ auto* parentRenderer = getMathMLParentNode(renderer);
+ const MathMLStyle* parentStyle = getMathMLStyle(parentRenderer);
+
+ // By default, we just inherit the style from our parent.
+ m_displayStyle = false;
+ m_mathVariant = MathMLElement::MathVariant::None;
+ if (parentStyle) {
+ setDisplayStyle(parentStyle->displayStyle());
+ setMathVariant(parentStyle->mathVariant());
+ }
+
+ // Early return for anonymous renderers.
+ if (renderer->isAnonymous()) {
+ updateStyleIfNeeded(renderer, oldDisplayStyle, oldMathVariant);
+ return;
+ }
+
+ if (is<RenderMathMLMath>(renderer) || is<RenderMathMLTable>(renderer))
+ m_displayStyle = false; // The default displaystyle of <math> and <mtable> is false.
+ else if (parentRenderer) {
+ if (is<RenderMathMLFraction>(parentRenderer))
+ m_displayStyle = false; // <mfrac> sets displaystyle to false within its numerator and denominator.
+ else if ((is<RenderMathMLRoot>(parentRenderer) && !parentRenderer->isRenderMathMLSquareRoot()) || is<RenderMathMLScripts>(parentRenderer) || is<RenderMathMLUnderOver>(parentRenderer)) {
+ // <mroot>, <msub>, <msup>, <msubsup>, <mmultiscripts>, <munder>, <mover> and <munderover> elements set displaystyle to false within their scripts.
+ auto* base = downcast<RenderBox>(parentRenderer)->firstChildBox();
+ if (renderer != base)
+ m_displayStyle = false;
+ }
+ }
+
+ // The displaystyle and mathvariant attributes override the default behavior.
+ auto* element = downcast<RenderElement>(renderer)->element();
+ if (is<MathMLElement>(element)) {
+ std::optional<bool> displayStyle = downcast<MathMLElement>(element)->specifiedDisplayStyle();
+ if (displayStyle)
+ m_displayStyle = displayStyle.value();
+ std::optional<MathMLElement::MathVariant> mathVariant = downcast<MathMLElement>(element)->specifiedMathVariant();
+ if (mathVariant)
+ m_mathVariant = mathVariant.value();
+ }
+ updateStyleIfNeeded(renderer, oldDisplayStyle, oldMathVariant);
+}
+
+}
+
+#endif // ENABLE(MATHML)