Eliminate wstring from base/utf_offset_string_conversions.h, net/base/escape.h, and net/base/net_...

base/utf_offset_string_conversions.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/utf_offset_string_conversions.h"
 
 #include <algorithm>
 
 #include "base/scoped_ptr.h"
 #include "base/string_piece.h"
 #include "base/utf_string_conversion_utils.h"
 
 using base::PrepareForUTF16Or32Output;
 using base::ReadUnicodeCharacter;
 using base::WriteUnicodeCharacter;
 
-// Generalized Unicode converter -----------------------------------------------
-
 // Converts the given source Unicode character type to the given destination
 // Unicode character type as a STL string. The given input buffer and size
 // determine the source, and the given output STL string will be replaced by
 // the result.
-template<typename SRC_CHAR>
-bool ConvertUnicode(const SRC_CHAR* src,
+bool ConvertUnicode(const char* src,
                     size_t src_len,
-                    std::wstring* output,
+                    string16* output,
                     std::vector<size_t>* offsets_for_adjustment) {
   if (offsets_for_adjustment) {
     std::for_each(offsets_for_adjustment->begin(),
                   offsets_for_adjustment->end(),
-                  LimitOffset<std::wstring>(src_len));
+                  LimitOffset<string16>(src_len));
   }
 
   // ICU requires 32-bit numbers.
   bool success = true;
-  AdjustOffset::Adjustments adjustments;
+  OffsetAdjuster offset_adjuster(offsets_for_adjustment);
   int32 src_len32 = static_cast<int32>(src_len);
   for (int32 i = 0; i < src_len32; i++) {
     uint32 code_point;
     size_t original_i = i;
     size_t chars_written = 0;
     if (ReadUnicodeCharacter(src, src_len32, &i, &code_point)) {
       chars_written = WriteUnicodeCharacter(code_point, output);
     } else {
       chars_written = WriteUnicodeCharacter(0xFFFD, output);
       success = false;
     }
     if (offsets_for_adjustment) {
       // NOTE: ReadUnicodeCharacter() adjusts |i| to point _at_ the last
       // character read, not after it (so that incrementing it in the loop
       // increment will place it at the right location), so we need to account
       // for that in determining the amount that was read.
-      adjustments.push_back(AdjustOffset::Adjustment(
-          original_i, i - original_i + 1, chars_written));
+      offset_adjuster.Add(OffsetAdjuster::Adjustment(original_i,
+          i - original_i + 1, chars_written));
     }
   }
-
-  // Make offset adjustment.
-  if (offsets_for_adjustment && !adjustments.empty()) {
-    std::for_each(offsets_for_adjustment->begin(),
-                  offsets_for_adjustment->end(),
-                  AdjustOffset(adjustments));
-  }
-
   return success;
 }
 
-// UTF-8 <-> Wide --------------------------------------------------------------
-
-bool UTF8ToWideAndAdjustOffset(const char* src,
-                               size_t src_len,
-                               std::wstring* output,
-                               size_t* offset_for_adjustment) {
+bool UTF8ToUTF16AndAdjustOffset(const char* src,
+                                size_t src_len,
+                                string16* output,
+                                size_t* offset_for_adjustment) {
   std::vector<size_t> offsets;
   if (offset_for_adjustment)
     offsets.push_back(*offset_for_adjustment);
   PrepareForUTF16Or32Output(src, src_len, output);
   bool ret = ConvertUnicode(src, src_len, output, &offsets);
   if (offset_for_adjustment)
     *offset_for_adjustment = offsets[0];
   return ret;
 }
 
-bool UTF8ToWideAndAdjustOffsets(const char* src,
-                                size_t src_len,
-                                std::wstring* output,
-                                std::vector<size_t>* offsets_for_adjustment) {
+bool UTF8ToUTF16AndAdjustOffsets(const char* src,
+                                 size_t src_len,
+                                 string16* output,
+                                 std::vector<size_t>* offsets_for_adjustment) {
   PrepareForUTF16Or32Output(src, src_len, output);
   return ConvertUnicode(src, src_len, output, offsets_for_adjustment);
 }
 
-std::wstring UTF8ToWideAndAdjustOffset(const base::StringPiece& utf8,
-                                       size_t* offset_for_adjustment) {
-  std::vector<size_t> offsets;
-  if (offset_for_adjustment)
-    offsets.push_back(*offset_for_adjustment);
-  std::wstring result;
-  UTF8ToWideAndAdjustOffsets(utf8.data(), utf8.length(), &result,
-                             &offsets);
-  if (offset_for_adjustment)
-    *offset_for_adjustment = offsets[0];
-  return result;
-}
-
-std::wstring UTF8ToWideAndAdjustOffsets(const base::StringPiece& utf8,
-                                        std::vector<size_t>*
-                                            offsets_for_adjustment) {
-  std::wstring result;
-  UTF8ToWideAndAdjustOffsets(utf8.data(), utf8.length(), &result,
-                             offsets_for_adjustment);
-  return result;
-}
-
-// UTF-16 <-> Wide -------------------------------------------------------------
-
-#if defined(WCHAR_T_IS_UTF16)
-
-// When wide == UTF-16, then conversions are a NOP.
-bool UTF16ToWideAndAdjustOffset(const char16* src,
-                                size_t src_len,
-                                std::wstring* output,
-                                size_t* offset_for_adjustment) {
-  output->assign(src, src_len);
-  if (offset_for_adjustment && (*offset_for_adjustment >= src_len))
-    *offset_for_adjustment = std::wstring::npos;
-  return true;
-}
-
-bool UTF16ToWideAndAdjustOffsets(const char16* src,
-                                 size_t src_len,
-                                 std::wstring* output,
-                                 std::vector<size_t>* offsets_for_adjustment) {
-  output->assign(src, src_len);
-  if (offsets_for_adjustment) {
-    std::for_each(offsets_for_adjustment->begin(),
-                  offsets_for_adjustment->end(),
-                  LimitOffset<std::wstring>(src_len));
-  }
-  return true;
-}
-
-std::wstring UTF16ToWideAndAdjustOffset(const string16& utf16,
-                                        size_t* offset_for_adjustment) {
-  if (offset_for_adjustment && (*offset_for_adjustment >= utf16.length()))
-    *offset_for_adjustment = std::wstring::npos;
-  return utf16;
-}
-
-std::wstring UTF16ToWideAndAdjustOffsets(
-    const string16& utf16,
-    std::vector<size_t>* offsets_for_adjustment) {
-  if (offsets_for_adjustment) {
-    std::for_each(offsets_for_adjustment->begin(),
-                  offsets_for_adjustment->end(),
-                  LimitOffset<std::wstring>(utf16.length()));
-  }
-  return utf16;
-}
-
-#elif defined(WCHAR_T_IS_UTF32)
-
-bool UTF16ToWideAndAdjustOffset(const char16* src,
-                                size_t src_len,
-                                std::wstring* output,
-                                size_t* offset_for_adjustment) {
-  std::vector<size_t> offsets;
-  if (offset_for_adjustment)
-    offsets.push_back(*offset_for_adjustment);
-  output->clear();
-  // Assume that normally we won't have any non-BMP characters so the counts
-  // will be the same.
-  output->reserve(src_len);
-  bool ret = ConvertUnicode(src, src_len, output, &offsets);
-  if (offset_for_adjustment)
-    *offset_for_adjustment = offsets[0];
-  return ret;
-}
-
-bool UTF16ToWideAndAdjustOffsets(const char16* src,
-                                 size_t src_len,
-                                 std::wstring* output,
-                                 std::vector<size_t>* offsets_for_adjustment) {
-  output->clear();
-  // Assume that normally we won't have any non-BMP characters so the counts
-  // will be the same.
-  output->reserve(src_len);
-  return ConvertUnicode(src, src_len, output, offsets_for_adjustment);
-}
-
-std::wstring UTF16ToWideAndAdjustOffset(const string16& utf16,
+string16 UTF8ToUTF16AndAdjustOffset(const base::StringPiece& utf8,
                                         size_t* offset_for_adjustment) {
   std::vector<size_t> offsets;
   if (offset_for_adjustment)
     offsets.push_back(*offset_for_adjustment);
-  std::wstring result;
-  UTF16ToWideAndAdjustOffsets(utf16.data(), utf16.length(), &result,
+  string16 result;
+  UTF8ToUTF16AndAdjustOffsets(utf8.data(), utf8.length(), &result,
                               &offsets);
   if (offset_for_adjustment)
     *offset_for_adjustment = offsets[0];
   return result;
 }
 
-std::wstring UTF16ToWideAndAdjustOffsets(
-    const string16& utf16,
+string16 UTF8ToUTF16AndAdjustOffsets(
+    const base::StringPiece& utf8,
     std::vector<size_t>* offsets_for_adjustment) {
-  std::wstring result;
-  UTF16ToWideAndAdjustOffsets(utf16.data(), utf16.length(), &result,
+  string16 result;
+  UTF8ToUTF16AndAdjustOffsets(utf8.data(), utf8.length(), &result,
                               offsets_for_adjustment);
   return result;
 }
 
-#endif  // defined(WCHAR_T_IS_UTF32)
+OffsetAdjuster::Adjustment::Adjustment(size_t original_offset,
+                                       size_t original_length,
+                                       size_t output_length)
+    : original_offset(original_offset),
+      original_length(original_length),
+      output_length(output_length) {
+}
 
-AdjustOffset::Adjustment::Adjustment(size_t location,
-                                     size_t old_length,
-                                     size_t new_length)
-  : location(location),
-    old_length(old_length),
-    new_length(new_length) {}
+OffsetAdjuster::OffsetAdjuster(std::vector<size_t>* offsets_for_adjustment)
+    : offsets_for_adjustment_(offsets_for_adjustment) {
+}
 
-AdjustOffset::AdjustOffset(const Adjustments& adjustments)
-    : adjustments_(adjustments) {}
+OffsetAdjuster::~OffsetAdjuster() {
+  if (!offsets_for_adjustment_ || adjustments_.empty())
+    return;
+  for (std::vector<size_t>::iterator i(offsets_for_adjustment_->begin());
+       i != offsets_for_adjustment_->end(); ++i)
+    AdjustOffset(i);
+}
 
-void AdjustOffset::operator()(size_t& offset) {
-  if (offset == std::wstring::npos)
+void OffsetAdjuster::Add(const Adjustment& adjustment) {
+  adjustments_.push_back(adjustment);
+}
+
+void OffsetAdjuster::AdjustOffset(std::vector<size_t>::iterator offset) {
+  if (*offset == string16::npos)
     return;
   size_t adjustment = 0;
-  for (Adjustments::const_iterator i = adjustments_.begin();
+  for (std::vector<Adjustment>::const_iterator i = adjustments_.begin();
        i != adjustments_.end(); ++i) {
-    size_t location = i->location;
-    if (offset == location && i->new_length == 0) {
-      offset = std::wstring::npos;
+    if (*offset == i->original_offset && i->output_length == 0) {
+      *offset = string16::npos;
       return;
     }
-    if (offset <= location)
+    if (*offset <= i->original_offset)
       break;
-    if (offset < (location + i->old_length)) {
-      offset = std::wstring::npos;
+    if (*offset < (i->original_offset + i->original_length)) {
+      *offset = string16::npos;
       return;
     }
-    adjustment += (i->old_length - i->new_length);
+    adjustment += (i->original_length - i->output_length);
   }
-  offset -= adjustment;
+  *offset -= adjustment;
 }