Implement word selection in CFDE_TextEditEngine

This CL implements the needed logic in CFDE_TextEditEngine to handle
word selection.

Change-Id: I6b388c23655037fec107d68ec07d33638b959374
Reviewed-on: https://pdfium-review.googlesource.com/13211
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: Ryan Harrison <rharrison@chromium.org>
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>

2 files changed, 10 insertions, 24 deletions

diff --git a/core/fxcrt/cfx_wordbreak.cpp b/core/fxcrt/cfx_wordbreak.cpp
index 7a5d8f7dcd..86c6d40522 100644
--- a/core/fxcrt/cfx_wordbreak.cpp
+++ b/core/fxcrt/cfx_wordbreak.cpp
@@ -2779,16 +2779,14 @@ FX_WordBreakProp GetWordBreakProperty(wchar_t wcCodePoint) {
 
 }  // namespace
 
-CFX_WordBreak::CFX_WordBreak() {}
+CFX_WordBreak::CFX_WordBreak(std::unique_ptr<IFX_CharIter> pIter)
+    : m_pCurIter(std::move(pIter)) {
+  ASSERT(m_pCurIter);
+}
 
 CFX_WordBreak::~CFX_WordBreak() {}
 
-void CFX_WordBreak::Attach(IFX_CharIter* pIter) {
-  ASSERT(pIter);
-  m_pCurIter.reset(pIter);
-}
-
-void CFX_WordBreak::SetAt(int32_t nIndex) {
+std::pair<size_t, size_t> CFX_WordBreak::BoundsAt(int32_t nIndex) {
   m_pPreIter.reset();
   m_pCurIter->SetAt(nIndex);
   FindNextBreakPos(m_pCurIter.get(), true);
@@ -2796,18 +2794,8 @@ void CFX_WordBreak::SetAt(int32_t nIndex) {
   m_pPreIter = std::move(m_pCurIter);
   m_pCurIter = m_pPreIter->Clone();
   FindNextBreakPos(m_pCurIter.get(), false);
-}
-
-int32_t CFX_WordBreak::GetWordPos() const {
-  return m_pPreIter->GetAt();
-}
-
-int32_t CFX_WordBreak::GetWordLength() const {
-  return m_pCurIter->GetAt() - m_pPreIter->GetAt() + 1;
-}
 
-bool CFX_WordBreak::IsEOF(bool bTail) const {
-  return m_pCurIter->IsEOF(bTail);
+  return {m_pPreIter->GetAt(), m_pCurIter->GetAt()};
 }
 
 bool CFX_WordBreak::FindNextBreakPos(IFX_CharIter* pIter, bool bPrev) {
diff --git a/core/fxcrt/cfx_wordbreak.h b/core/fxcrt/cfx_wordbreak.h
index 59c071be03..6e94c71e95 100644
--- a/core/fxcrt/cfx_wordbreak.h
+++ b/core/fxcrt/cfx_wordbreak.h
@@ -8,22 +8,20 @@
 #define CORE_FXCRT_CFX_WORDBREAK_H_
 
 #include <memory>
+#include <utility>
 
 class IFX_CharIter;
 
 class CFX_WordBreak {
  public:
-  CFX_WordBreak();
+  explicit CFX_WordBreak(std::unique_ptr<IFX_CharIter> pIter);
   ~CFX_WordBreak();
 
-  void Attach(IFX_CharIter* pIter);
-  void SetAt(int32_t nIndex);
-  int32_t GetWordPos() const;
-  int32_t GetWordLength() const;
+  // <start_idx, end_idx>
+  std::pair<size_t, size_t> BoundsAt(int32_t nIndex);
 
  private:
   bool FindNextBreakPos(IFX_CharIter* pIter, bool bPrev);
-  bool IsEOF(bool bTail) const;
 
   std::unique_ptr<IFX_CharIter> m_pPreIter;
   std::unique_ptr<IFX_CharIter> m_pCurIter;