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
31 namespace WTF {
32
lineEndings(const String & text)33 PassOwnPtr<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
toOffset(const Vector<unsigned> & lineEndings)51 OrdinalNumber 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
fromOffsetAndLineEndings(unsigned offset,const Vector<unsigned> & lineEndings)57 TextPosition 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