1 files changed, 65 insertions, 0 deletions
diff --git a/chromium/third_party/blink/renderer/core/mathml/mathml_space_element.cc b/chromium/third_party/blink/renderer/core/mathml/mathml_space_element.cc
new file mode 100644
index 00000000000..716fe389fb9
--- /dev/null
+++ b/chromium/third_party/blink/renderer/core/mathml/mathml_space_element.cc
@@ -0,0 +1,65 @@
+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "third_party/blink/renderer/core/mathml/mathml_space_element.h"
+
+#include "third_party/blink/renderer/core/layout/ng/mathml/layout_ng_mathml_block.h"
+#include "third_party/blink/renderer/platform/runtime_enabled_features.h"
+
+namespace blink {
+
+MathMLSpaceElement::MathMLSpaceElement(Document& doc)
+    : MathMLElement(mathml_names::kMspaceTag, doc) {}
+
+void MathMLSpaceElement::AddMathBaselineIfNeeded(
+    ComputedStyle& style,
+    const CSSToLengthConversionData& conversion_data) {
+  if (auto length_or_percentage_value = AddMathLengthToComputedStyle(
+          style, conversion_data, mathml_names::kHeightAttr))
+    style.SetMathBaseline(std::move(*length_or_percentage_value));
+}
+
+bool MathMLSpaceElement::IsPresentationAttribute(
+    const QualifiedName& name) const {
+  if (name == mathml_names::kWidthAttr || name == mathml_names::kHeightAttr ||
+      name == mathml_names::kDepthAttr)
+    return true;
+  return MathMLElement::IsPresentationAttribute(name);
+}
+
+void MathMLSpaceElement::CollectStyleForPresentationAttribute(
+    const QualifiedName& name,
+    const AtomicString& value,
+    MutableCSSPropertyValueSet* style) {
+  if (name == mathml_names::kWidthAttr) {
+    AddPropertyToPresentationAttributeStyle(style, CSSPropertyID::kWidth,
+                                            value);
+  } else if (name == mathml_names::kHeightAttr ||
+             name == mathml_names::kDepthAttr) {
+    // TODO(rbuis): this can be simplified once attr() is supported for
+    // width/height.
+    String height = FastGetAttribute(mathml_names::kHeightAttr);
+    String depth = FastGetAttribute(mathml_names::kDepthAttr);
+    if (!height.IsEmpty() && !depth.IsEmpty()) {
+      AddPropertyToPresentationAttributeStyle(
+          style, CSSPropertyID::kHeight,
+          "calc(" + height + " + " + depth + ")");
+    } else {
+      AddPropertyToPresentationAttributeStyle(style, CSSPropertyID::kHeight,
+                                              value);
+    }
+  } else {
+    MathMLElement::CollectStyleForPresentationAttribute(name, value, style);
+  }
+}
+
+LayoutObject* MathMLSpaceElement::CreateLayoutObject(const ComputedStyle& style,
+                                                     LegacyLayout legacy) {
+  if (!RuntimeEnabledFeatures::MathMLCoreEnabled() ||
+      !style.IsDisplayMathType() || legacy == LegacyLayout::kForce)
+    return MathMLElement::CreateLayoutObject(style, legacy);
+  return new LayoutNGMathMLBlock(this);
+}
+
+}  // namespace blink