Clean up CFX_BidiString.

- Refer to the string in CFX_BidiString by const-ref.
- Remove useless CharAt() method.
- Turn a member variable into a local variable.

Change-Id: I30f221b7350150c839a793129789d8ea7cc1f331
Reviewed-on: https://pdfium-review.googlesource.com/31670
Reviewed-by: dsinclair <dsinclair@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

1 files changed, 12 insertions, 9 deletions

diff --git a/core/fxcrt/fx_bidi.cpp b/core/fxcrt/fx_bidi.cpp
index db46d994c9..48504e5821 100644
--- a/core/fxcrt/fx_bidi.cpp
+++ b/core/fxcrt/fx_bidi.cpp
@@ -577,16 +577,14 @@ void CFX_BidiChar::StartNewSegment(CFX_BidiChar::Direction direction) {
   m_CurrentSegment.direction = direction;
 }
 
-CFX_BidiString::CFX_BidiString(const WideString& str)
-    : m_Str(str),
-      m_pBidiChar(pdfium::MakeUnique<CFX_BidiChar>()),
-      m_eOverallDirection(CFX_BidiChar::LEFT) {
-  for (const auto& c : m_Str) {
-    if (m_pBidiChar->AppendChar(c))
-      m_Order.push_back(m_pBidiChar->GetSegmentInfo());
+CFX_BidiString::CFX_BidiString(const WideString& str) : m_Str(str) {
+  CFX_BidiChar bidi;
+  for (wchar_t c : m_Str) {
+    if (bidi.AppendChar(c))
+      m_Order.push_back(bidi.GetSegmentInfo());
   }
-  if (m_pBidiChar->EndChar())
-    m_Order.push_back(m_pBidiChar->GetSegmentInfo());
+  if (bidi.EndChar())
+    m_Order.push_back(bidi.GetSegmentInfo());
 
   size_t nR2L = std::count_if(m_Order.begin(), m_Order.end(),
                               [](const CFX_BidiChar::Segment& seg) {
@@ -604,6 +602,11 @@ CFX_BidiString::CFX_BidiString(const WideString& str)
 
 CFX_BidiString::~CFX_BidiString() {}
 
+CFX_BidiChar::Direction CFX_BidiString::OverallDirection() const {
+  ASSERT(m_eOverallDirection != CFX_BidiChar::NEUTRAL);
+  return m_eOverallDirection;
+}
+
 void CFX_BidiString::SetOverallDirectionRight() {
   if (m_eOverallDirection != CFX_BidiChar::RIGHT) {
     std::reverse(m_Order.begin(), m_Order.end());