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// Copyright 2018 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 "third_party/blink/renderer/platform/text/capitalize.h"
#include "third_party/blink/renderer/platform/text/text_break_iterator.h"
#include "third_party/blink/renderer/platform/wtf/text/string_buffer.h"
#include "third_party/blink/renderer/platform/wtf/text/string_builder.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
namespace blink {
String Capitalize(const String& string, UChar previous_character) {
if (string.IsNull())
return string;
unsigned length = string.length();
const StringImpl& input = *string.Impl();
CHECK_LT(length, std::numeric_limits<unsigned>::max());
StringBuffer<UChar> string_with_previous(length + 1);
string_with_previous[0] = previous_character == kNoBreakSpaceCharacter
? kSpaceCharacter
: previous_character;
for (unsigned i = 1; i < length + 1; i++) {
// Replace   with a real space since ICU no longer treats   as a
// word separator.
if (input[i - 1] == kNoBreakSpaceCharacter)
string_with_previous[i] = kSpaceCharacter;
else
string_with_previous[i] = input[i - 1];
}
TextBreakIterator* boundary =
WordBreakIterator(string_with_previous.Characters(), length + 1);
if (!boundary)
return string;
StringBuilder result;
result.ReserveCapacity(length);
int32_t end_of_word;
int32_t start_of_word = boundary->first();
for (end_of_word = boundary->next(); end_of_word != kTextBreakDone;
start_of_word = end_of_word, end_of_word = boundary->next()) {
if (start_of_word) { // Ignore first char of previous string
result.Append(
input[start_of_word - 1] == kNoBreakSpaceCharacter
? kNoBreakSpaceCharacter
: WTF::unicode::ToTitleCase(string_with_previous[start_of_word]));
}
for (int i = start_of_word + 1; i < end_of_word; i++)
result.Append(input[i - 1]);
}
return result.ToString();
}
} // namespace blink
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