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/*
* Copyright (C) 2013, Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*/
#include "third_party/blink/renderer/platform/wtf/text/text_position.h"
#include <algorithm>
#include <memory>
#include "third_party/blink/renderer/platform/wtf/std_lib_extras.h"
namespace WTF {
std::unique_ptr<Vector<wtf_size_t>> GetLineEndings(const String& text) {
std::unique_ptr<Vector<wtf_size_t>> result(
std::make_unique<Vector<wtf_size_t>>());
unsigned start = 0;
while (start < text.length()) {
wtf_size_t line_end = text.find('\n', start);
if (line_end == kNotFound)
break;
result->push_back(line_end);
start = line_end + 1;
}
result->push_back(text.length());
return result;
}
OrdinalNumber TextPosition::ToOffset(const Vector<unsigned>& line_endings) {
unsigned line_start_offset =
line_ != OrdinalNumber::First()
? line_endings.at(line_.ZeroBasedInt() - 1) + 1
: 0;
return OrdinalNumber::FromZeroBasedInt(line_start_offset +
column_.ZeroBasedInt());
}
TextPosition TextPosition::FromOffsetAndLineEndings(
unsigned offset,
const Vector<unsigned>& line_endings) {
const auto found_line_ending =
std::lower_bound(line_endings.begin(), line_endings.end(), offset);
int line_index = std::distance(line_endings.begin(), found_line_ending);
unsigned line_start_offset =
line_index > 0 ? line_endings.at(line_index - 1) + 1 : 0;
int column = offset - line_start_offset;
return TextPosition(OrdinalNumber::FromZeroBasedInt(line_index),
OrdinalNumber::FromZeroBasedInt(column));
}
} // namespace WTF
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