1/*
2 * Copyright (C) 2013, Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1.  Redistributions of source code must retain the above copyright
8 *     notice, this list of conditions and the following disclaimer.
9 * 2.  Redistributions in binary form must reproduce the above copyright
10 *     notice, this list of conditions and the following disclaimer in the
11 *     documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
16 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */
24
25#include "config.h"
26#include "wtf/text/TextPosition.h"
27
28#include "wtf/PassOwnPtr.h"
29#include "wtf/StdLibExtras.h"
30
31namespace WTF {
32
33PassOwnPtr<Vector<unsigned> > lineEndings(const String& text)
34{
35    OwnPtr<Vector<unsigned> > result(adoptPtr(new Vector<unsigned>()));
36
37    unsigned start = 0;
38    while (start < text.length()) {
39        size_t lineEnd = text.find('\n', start);
40        if (lineEnd == kNotFound)
41            break;
42
43        result->append(static_cast<unsigned>(lineEnd));
44        start = lineEnd + 1;
45    }
46    result->append(text.length());
47
48    return result.release();
49}
50
51OrdinalNumber TextPosition::toOffset(const Vector<unsigned>& lineEndings)
52{
53    unsigned lineStartOffset = m_line != OrdinalNumber::first() ? lineEndings.at(m_line.zeroBasedInt() - 1) + 1 : 0;
54    return OrdinalNumber::fromZeroBasedInt(lineStartOffset + m_column.zeroBasedInt());
55}
56
57TextPosition TextPosition::fromOffsetAndLineEndings(unsigned offset, const Vector<unsigned>& lineEndings)
58{
59    const unsigned* foundLineEnding = std::lower_bound(lineEndings.begin(), lineEndings.end(), offset);
60    int lineIndex = foundLineEnding - &lineEndings.at(0);
61    unsigned lineStartOffset = lineIndex > 0 ? lineEndings.at(lineIndex - 1) + 1 : 0;
62    int column = offset - lineStartOffset;
63    return TextPosition(OrdinalNumber::fromZeroBasedInt(lineIndex), OrdinalNumber::fromZeroBasedInt(column));
64}
65
66} // namespace WTF
67