third_party/WebKit/Source/wtf/text/TextPosition.cpp

   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
  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
  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
  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