1 files changed, 196 insertions, 0 deletions
diff --git a/layout/mathml/nsMathMLTokenFrame.cpp b/layout/mathml/nsMathMLTokenFrame.cpp
new file mode 100644
index 0000000000..5481e6faec
--- /dev/null
+++ b/layout/mathml/nsMathMLTokenFrame.cpp
@@ -0,0 +1,196 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsMathMLTokenFrame.h"
+
+#include "mozilla/PresShell.h"
+#include "nsLayoutUtils.h"
+#include "nsPresContext.h"
+#include "nsContentUtils.h"
+#include "nsTextFrame.h"
+#include "gfxContext.h"
+#include <algorithm>
+
+using namespace mozilla;
+
+nsIFrame* NS_NewMathMLTokenFrame(PresShell* aPresShell, ComputedStyle* aStyle) {
+  return new (aPresShell)
+      nsMathMLTokenFrame(aStyle, aPresShell->GetPresContext());
+}
+
+NS_IMPL_FRAMEARENA_HELPERS(nsMathMLTokenFrame)
+
+nsMathMLTokenFrame::~nsMathMLTokenFrame() = default;
+
+NS_IMETHODIMP
+nsMathMLTokenFrame::InheritAutomaticData(nsIFrame* aParent) {
+  // let the base class get the default from our parent
+  nsMathMLContainerFrame::InheritAutomaticData(aParent);
+
+  return NS_OK;
+}
+
+eMathMLFrameType nsMathMLTokenFrame::GetMathMLFrameType() {
+  // treat everything other than <mi> as ordinary...
+  if (!mContent->IsMathMLElement(nsGkAtoms::mi_)) {
+    return eMathMLFrameType_Ordinary;
+  }
+
+  StyleMathVariant mathVariant = StyleFont()->mMathVariant;
+  if ((mathVariant == StyleMathVariant::None &&
+       (StyleFont()->mFont.style.IsItalic() ||
+        HasAnyStateBits(NS_FRAME_IS_IN_SINGLE_CHAR_MI))) ||
+      mathVariant == StyleMathVariant::Italic ||
+      mathVariant == StyleMathVariant::BoldItalic ||
+      mathVariant == StyleMathVariant::SansSerifItalic ||
+      mathVariant == StyleMathVariant::SansSerifBoldItalic) {
+    return eMathMLFrameType_ItalicIdentifier;
+  }
+  return eMathMLFrameType_UprightIdentifier;
+}
+
+void nsMathMLTokenFrame::MarkTextFramesAsTokenMathML() {
+  nsIFrame* child = nullptr;
+  uint32_t childCount = 0;
+
+  // Set flags on child text frames
+  // - to force them to trim their leading and trailing whitespaces.
+  // - Indicate which frames are suitable for mathvariant
+  // - flag single character <mi> frames for special italic treatment
+  for (nsIFrame* childFrame = PrincipalChildList().FirstChild(); childFrame;
+       childFrame = childFrame->GetNextSibling()) {
+    for (nsIFrame* childFrame2 = childFrame->PrincipalChildList().FirstChild();
+         childFrame2; childFrame2 = childFrame2->GetNextSibling()) {
+      if (childFrame2->IsTextFrame()) {
+        childFrame2->AddStateBits(TEXT_IS_IN_TOKEN_MATHML);
+        child = childFrame2;
+        childCount++;
+      }
+    }
+  }
+  if (mContent->IsMathMLElement(nsGkAtoms::mi_) && childCount == 1) {
+    nsAutoString data;
+    nsContentUtils::GetNodeTextContent(mContent, false, data);
+
+    data.CompressWhitespace();
+    int32_t length = data.Length();
+
+    bool isSingleCharacter =
+        length == 1 || (length == 2 && NS_IS_HIGH_SURROGATE(data[0]));
+
+    if (isSingleCharacter) {
+      child->AddStateBits(NS_FRAME_IS_IN_SINGLE_CHAR_MI);
+      AddStateBits(NS_FRAME_IS_IN_SINGLE_CHAR_MI);
+    }
+  }
+}
+
+void nsMathMLTokenFrame::SetInitialChildList(ChildListID aListID,
+                                             nsFrameList&& aChildList) {
+  // First, let the base class do its work
+  nsMathMLContainerFrame::SetInitialChildList(aListID, std::move(aChildList));
+  MarkTextFramesAsTokenMathML();
+}
+
+void nsMathMLTokenFrame::AppendFrames(ChildListID aListID,
+                                      nsFrameList&& aChildList) {
+  nsMathMLContainerFrame::AppendFrames(aListID, std::move(aChildList));
+  MarkTextFramesAsTokenMathML();
+}
+
+void nsMathMLTokenFrame::InsertFrames(
+    ChildListID aListID, nsIFrame* aPrevFrame,
+    const nsLineList::iterator* aPrevFrameLine, nsFrameList&& aChildList) {
+  nsMathMLContainerFrame::InsertFrames(aListID, aPrevFrame, aPrevFrameLine,
+                                       std::move(aChildList));
+  MarkTextFramesAsTokenMathML();
+}
+
+void nsMathMLTokenFrame::Reflow(nsPresContext* aPresContext,
+                                ReflowOutput& aDesiredSize,
+                                const ReflowInput& aReflowInput,
+                                nsReflowStatus& aStatus) {
+  MarkInReflow();
+  MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");
+
+  mPresentationData.flags &= ~NS_MATHML_ERROR;
+
+  // initializations needed for empty markup like <mtag></mtag>
+  aDesiredSize.ClearSize();
+  aDesiredSize.SetBlockStartAscent(0);
+  aDesiredSize.mBoundingMetrics = nsBoundingMetrics();
+
+  for (nsIFrame* childFrame : PrincipalChildList()) {
+    // ask our children to compute their bounding metrics
+    ReflowOutput childDesiredSize(aReflowInput.GetWritingMode());
+    WritingMode wm = childFrame->GetWritingMode();
+    LogicalSize availSize = aReflowInput.ComputedSize(wm);
+    availSize.BSize(wm) = NS_UNCONSTRAINEDSIZE;
+    ReflowInput childReflowInput(aPresContext, aReflowInput, childFrame,
+                                 availSize);
+    nsReflowStatus childStatus;
+    ReflowChild(childFrame, aPresContext, childDesiredSize, childReflowInput,
+                childStatus);
+    NS_ASSERTION(childStatus.IsComplete(),
+                 "We gave the child unconstrained available block-size, so its "
+                 "status should be complete!");
+    SaveReflowAndBoundingMetricsFor(childFrame, childDesiredSize,
+                                    childDesiredSize.mBoundingMetrics);
+  }
+
+  // place and size children
+  FinalizeReflow(aReflowInput.mRenderingContext->GetDrawTarget(), aDesiredSize);
+
+  aStatus.Reset();  // This type of frame can't be split.
+}
+
+// For token elements, mBoundingMetrics is computed at the ReflowToken
+// pass, it is not computed here because our children may be text frames
+// that do not implement the GetBoundingMetrics() interface.
+/* virtual */
+nsresult nsMathMLTokenFrame::Place(DrawTarget* aDrawTarget, bool aPlaceOrigin,
+                                   ReflowOutput& aDesiredSize) {
+  mBoundingMetrics = nsBoundingMetrics();
+  for (nsIFrame* childFrame : PrincipalChildList()) {
+    ReflowOutput childSize(aDesiredSize.GetWritingMode());
+    GetReflowAndBoundingMetricsFor(childFrame, childSize,
+                                   childSize.mBoundingMetrics, nullptr);
+    // compute and cache the bounding metrics
+    mBoundingMetrics += childSize.mBoundingMetrics;
+  }
+
+  RefPtr<nsFontMetrics> fm =
+      nsLayoutUtils::GetInflatedFontMetricsForFrame(this);
+  nscoord ascent = fm->MaxAscent();
+  nscoord descent = fm->MaxDescent();
+
+  aDesiredSize.mBoundingMetrics = mBoundingMetrics;
+  aDesiredSize.Width() = mBoundingMetrics.width;
+  aDesiredSize.SetBlockStartAscent(std::max(mBoundingMetrics.ascent, ascent));
+  aDesiredSize.Height() = aDesiredSize.BlockStartAscent() +
+                          std::max(mBoundingMetrics.descent, descent);
+
+  if (aPlaceOrigin) {
+    nscoord dy, dx = 0;
+    for (nsIFrame* childFrame : PrincipalChildList()) {
+      ReflowOutput childSize(aDesiredSize.GetWritingMode());
+      GetReflowAndBoundingMetricsFor(childFrame, childSize,
+                                     childSize.mBoundingMetrics);
+
+      // place and size the child; (dx,0) makes the caret happy - bug 188146
+      dy = childSize.Height() == 0
+               ? 0
+               : aDesiredSize.BlockStartAscent() - childSize.BlockStartAscent();
+      FinishReflowChild(childFrame, PresContext(), childSize, nullptr, dx, dy,
+                        ReflowChildFlags::Default);
+      dx += childSize.Width();
+    }
+  }
+
+  SetReference(nsPoint(0, aDesiredSize.BlockStartAscent()));
+
+  return NS_OK;
+}