Move TextIteratorTextNodeHandler to dedicated files

third_party/WebKit/Source/core/editing/iterators/TextIterator.h

Index: third_party/WebKit/Source/core/editing/iterators/TextIterator.h
diff --git a/third_party/WebKit/Source/core/editing/iterators/TextIterator.h b/third_party/WebKit/Source/core/editing/iterators/TextIterator.h
index 2c3e4ec4321f5edac88914a4a10992b2bbeb73bf..fd420e0ff9d07992c34fa24e46fa4dd5fc0cb12b 100644
--- a/third_party/WebKit/Source/core/editing/iterators/TextIterator.h
+++ b/third_party/WebKit/Source/core/editing/iterators/TextIterator.h
@@ -32,16 +32,12 @@
 #include "core/editing/FindOptions.h"
 #include "core/editing/iterators/FullyClippedStateStack.h"
 #include "core/editing/iterators/TextIteratorBehavior.h"
+#include "core/editing/iterators/TextIteratorTextNodeHandler.h"
 #include "core/editing/iterators/TextIteratorTextState.h"
 #include "platform/heap/Handle.h"
-#include "platform/wtf/Vector.h"
 
 namespace blink {
 
-class InlineTextBox;
-class LayoutText;
-class LayoutTextFragment;
-
 CORE_EXPORT String
 PlainText(const EphemeralRange&,
           const TextIteratorBehavior& = TextIteratorBehavior());
@@ -49,102 +45,6 @@ PlainText(const EphemeralRange&,
 String PlainText(const EphemeralRangeInFlatTree&,
                  const TextIteratorBehavior& = TextIteratorBehavior());
 
-// TODO(xiaochengh): Move the class to dedicated files.
-// TextIteratorTextNodeHandler extracts plain text from a text node by calling
-// HandleTextNode() function. It should be used only by TextIterator.
-class TextIteratorTextNodeHandler final {
-  STACK_ALLOCATED();
-
- public:
-  TextIteratorTextNodeHandler(const TextIteratorBehavior&,
-                              TextIteratorTextState*);
-
-  // Initializes the full iteration range of the TextIterator. This function
-  // should be called only once from TextIterator::Initialize.
-  // TODO(xiaochengh): TextNodeHandler doesn't need to know the full iteration
-  // range; The offset range in the current node suffices. Remove this function.
-  void Initialize(Node* start_container,
-                  int start_offset,
-                  Node* end_container,
-                  int end_offset);
-
-  Text* GetNode() const { return text_node_; }
-
-  // Returns true if more text is emitted without traversing to the next node.
-  bool HandleRemainingTextRuns();
-
-  // Returns true if a leading white space is emitted before a replaced element.
-  bool FixLeadingWhiteSpaceForReplacedElement(Node*);
-
-  void ResetCollapsedWhiteSpaceFixup();
-
-  // TODO(xiaochengh): Make the return type |void|. The current return value is
-  // not very meaningful.
-  bool HandleTextNode(Text*);
-
- private:
-  void HandlePreFormattedTextNode();
-  void HandleTextBox();
-  void HandleTextNodeFirstLetter(LayoutTextFragment*);
-  bool ShouldHandleFirstLetter(const LayoutText&) const;
-  bool ShouldProceedToRemainingText() const;
-  void ProceedToRemainingText();
-  size_t RestoreCollapsedTrailingSpace(InlineTextBox* next_text_box,
-                                       size_t subrun_end);
-
-  // Used when the visibility of the style should not affect text gathering.
-  bool IgnoresStyleVisibility() const {
-    return behavior_.IgnoresStyleVisibility();
-  }
-
-  void SpliceBuffer(UChar,
-                    Node* text_node,
-                    Node* offset_base_node,
-                    int text_start_offset,
-                    int text_end_offset);
-  void EmitText(Node* text_node,
-                LayoutText* layout_object,
-                int text_start_offset,
-                int text_end_offset);
-
-  // The range.
-  Member<Node> start_container_;
-  int start_offset_ = 0;
-  Member<Node> end_container_;
-  int end_offset_ = 0;
-
-  // The current text node and offset, from which text is being emitted.
-  Member<Text> text_node_;
-  int offset_ = 0;
-
-  InlineTextBox* text_box_ = nullptr;
-
-  // Remember if we are in the middle of handling a pre-formatted text node.
-  bool needs_handle_pre_formatted_text_node_ = false;
-  // Used when deciding text fragment created by :first-letter should be looked
-  // into.
-  bool handled_first_letter_ = false;
-  // Used when iteration over :first-letter text to save pointer to
-  // remaining text box.
-  InlineTextBox* remaining_text_box_ = nullptr;
-  // Used to point to LayoutText object for :first-letter.
-  LayoutText* first_letter_text_ = nullptr;
-
-  // Used to do the whitespace collapsing logic.
-  bool last_text_node_ended_with_collapsed_space_ = false;
-
-  // Used when text boxes are out of order (Hebrew/Arabic w/ embeded LTR text)
-  Vector<InlineTextBox*> sorted_text_boxes_;
-  size_t sorted_text_boxes_position_ = 0;
-
-  const TextIteratorBehavior behavior_;
-
-  // Contains state of emitted text.
-  TextIteratorTextState& text_state_;
-
-  DISALLOW_COPY_AND_ASSIGN(TextIteratorTextNodeHandler);
-};
-
 // Iterates through the DOM range, returning all the text, and 0-length
 // boundaries at points where replaced elements break up the text flow.  The
 // text comes back in chunks so as to optimize for performance of the iteration.