diff -r 000000000000 -r 6474c204b198 widget/TextRange.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/widget/TextRange.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,196 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#ifndef mozilla_TextRage_h_
+#define mozilla_TextRage_h_
+
+#include <stdint.h>
+
+#include "nsAutoPtr.h"
+#include "nsColor.h"
+#include "nsStyleConsts.h"
+#include "nsTArray.h"
+
+namespace mozilla {
+
+/******************************************************************************
+ * mozilla::TextRangeStyle
+ ******************************************************************************/
+
+struct TextRangeStyle
+{
+  enum
+  {
+    LINESTYLE_NONE   = NS_STYLE_TEXT_DECORATION_STYLE_NONE,
+    LINESTYLE_SOLID  = NS_STYLE_TEXT_DECORATION_STYLE_SOLID,
+    LINESTYLE_DOTTED = NS_STYLE_TEXT_DECORATION_STYLE_DOTTED,
+    LINESTYLE_DASHED = NS_STYLE_TEXT_DECORATION_STYLE_DASHED,
+    LINESTYLE_DOUBLE = NS_STYLE_TEXT_DECORATION_STYLE_DOUBLE,
+    LINESTYLE_WAVY   = NS_STYLE_TEXT_DECORATION_STYLE_WAVY
+  };
+
+  enum
+  {
+    DEFINED_NONE             = 0x00,
+    DEFINED_LINESTYLE        = 0x01,
+    DEFINED_FOREGROUND_COLOR = 0x02,
+    DEFINED_BACKGROUND_COLOR = 0x04,
+    DEFINED_UNDERLINE_COLOR  = 0x08
+  };
+
+  // Initialize all members, because TextRange instances may be compared by
+  // memcomp.
+  TextRangeStyle()
+  {
+    Clear();
+  }
+
+  void Clear()
+  {
+    mDefinedStyles = DEFINED_NONE;
+    mLineStyle = LINESTYLE_NONE;
+    mIsBoldLine = false;
+    mForegroundColor = mBackgroundColor = mUnderlineColor = NS_RGBA(0, 0, 0, 0);
+  }
+
+  bool IsDefined() const { return mDefinedStyles != DEFINED_NONE; }
+
+  bool IsLineStyleDefined() const
+  {
+    return (mDefinedStyles & DEFINED_LINESTYLE) != 0;
+  }
+
+  bool IsForegroundColorDefined() const
+  {
+    return (mDefinedStyles & DEFINED_FOREGROUND_COLOR) != 0;
+  }
+
+  bool IsBackgroundColorDefined() const
+  {
+    return (mDefinedStyles & DEFINED_BACKGROUND_COLOR) != 0;
+  }
+
+  bool IsUnderlineColorDefined() const
+  {
+    return (mDefinedStyles & DEFINED_UNDERLINE_COLOR) != 0;
+  }
+
+  bool IsNoChangeStyle() const
+  {
+    return !IsForegroundColorDefined() && !IsBackgroundColorDefined() &&
+           IsLineStyleDefined() && mLineStyle == LINESTYLE_NONE;
+  }
+
+  bool Equals(const TextRangeStyle& aOther)
+  {
+    if (mDefinedStyles != aOther.mDefinedStyles)
+      return false;
+    if (IsLineStyleDefined() && (mLineStyle != aOther.mLineStyle ||
+                                 !mIsBoldLine != !aOther.mIsBoldLine))
+      return false;
+    if (IsForegroundColorDefined() &&
+        (mForegroundColor != aOther.mForegroundColor))
+      return false;
+    if (IsBackgroundColorDefined() &&
+        (mBackgroundColor != aOther.mBackgroundColor))
+      return false;
+    if (IsUnderlineColorDefined() &&
+        (mUnderlineColor != aOther.mUnderlineColor))
+      return false;
+    return true;
+  }
+
+  bool operator !=(const TextRangeStyle &aOther)
+  {
+    return !Equals(aOther);
+  }
+
+  bool operator ==(const TextRangeStyle &aOther)
+  {
+    return Equals(aOther);
+  }
+
+  uint8_t mDefinedStyles;
+  uint8_t mLineStyle;        // DEFINED_LINESTYLE
+
+  bool mIsBoldLine;  // DEFINED_LINESTYLE
+
+  nscolor mForegroundColor;  // DEFINED_FOREGROUND_COLOR
+  nscolor mBackgroundColor;  // DEFINED_BACKGROUND_COLOR
+  nscolor mUnderlineColor;   // DEFINED_UNDERLINE_COLOR
+};
+
+/******************************************************************************
+ * mozilla::TextRange
+ ******************************************************************************/
+
+#define NS_TEXTRANGE_CARETPOSITION         0x01
+#define NS_TEXTRANGE_RAWINPUT              0x02
+#define NS_TEXTRANGE_SELECTEDRAWTEXT       0x03
+#define NS_TEXTRANGE_CONVERTEDTEXT         0x04
+#define NS_TEXTRANGE_SELECTEDCONVERTEDTEXT 0x05
+
+struct TextRange
+{
+  TextRange() :
+    mStartOffset(0), mEndOffset(0), mRangeType(0)
+  {
+  }
+
+  uint32_t mStartOffset;
+  // XXX Storing end offset makes the initializing code very complicated.
+  //     We should replace it with mLength.
+  uint32_t mEndOffset;
+  uint32_t mRangeType;
+
+  TextRangeStyle mRangeStyle;
+
+  uint32_t Length() const { return mEndOffset - mStartOffset; }
+
+  bool IsClause() const
+  {
+    MOZ_ASSERT(mRangeType >= NS_TEXTRANGE_CARETPOSITION &&
+                 mRangeType <= NS_TEXTRANGE_SELECTEDCONVERTEDTEXT,
+               "Invalid range type");
+    return mRangeType != NS_TEXTRANGE_CARETPOSITION;
+  }
+};
+
+/******************************************************************************
+ * mozilla::TextRangeArray
+ ******************************************************************************/
+class TextRangeArray MOZ_FINAL : public nsAutoTArray<TextRange, 10>
+{
+  NS_INLINE_DECL_REFCOUNTING(TextRangeArray)
+
+public:
+  bool IsComposing() const
+  {
+    for (uint32_t i = 0; i < Length(); ++i) {
+      if (ElementAt(i).IsClause()) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  // Returns target clase offset.  If there are selected clauses, this returns
+  // the first selected clause offset.  Otherwise, 0.
+  uint32_t TargetClauseOffset() const
+  {
+    for (uint32_t i = 0; i < Length(); ++i) {
+      const TextRange& range = ElementAt(i);
+      if (range.mRangeType == NS_TEXTRANGE_SELECTEDRAWTEXT ||
+          range.mRangeType == NS_TEXTRANGE_SELECTEDCONVERTEDTEXT) {
+        return range.mStartOffset;
+      }
+    }
+    return 0;
+  }
+};
+
+} // namespace mozilla
+
+#endif // mozilla_TextRage_h_