third_party/WebKit/Source/platform/fonts/UnicodeRangeSet.cpp

/*
 * Copyright (C) 2007, 2008, 2011 Apple 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:
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 * 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 COMPUTER, INC. ``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 COMPUTER, INC. OR
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#include "UnicodeRangeSet.h"

#include "wtf/text/WTFString.h"

namespace blink {

UnicodeRangeSet::UnicodeRangeSet(const Vector<UnicodeRange>& ranges)
    : m_ranges(ranges) {
  if (m_ranges.isEmpty())
    return;

  std::sort(m_ranges.begin(), m_ranges.end());

  // Unify overlapping ranges.
  UChar32 from = m_ranges[0].from();
  UChar32 to = m_ranges[0].to();
  size_t targetIndex = 0;
  for (size_t i = 1; i < m_ranges.size(); i++) {
    if (to + 1 >= m_ranges[i].from()) {
      to = std::max(to, m_ranges[i].to());
    } else {
      m_ranges[targetIndex++] = UnicodeRange(from, to);
      from = m_ranges[i].from();
      to = m_ranges[i].to();
    }
  }
  m_ranges[targetIndex++] = UnicodeRange(from, to);
  m_ranges.shrink(targetIndex);
}

bool UnicodeRangeSet::contains(UChar32 c) const {
  if (isEntireRange())
    return true;
  Vector<UnicodeRange>::const_iterator it =
      std::lower_bound(m_ranges.begin(), m_ranges.end(), c);
  return it != m_ranges.end() && it->contains(c);
}

bool UnicodeRangeSet::intersectsWith(const String& text) const {
  if (text.isEmpty())
    return false;
  if (isEntireRange())
    return true;
  if (text.is8Bit() && m_ranges[0].from() >= 0x100)
    return false;

  unsigned index = 0;
  while (index < text.length()) {
    UChar32 c = text.characterStartingAt(index);
    index += U16_LENGTH(c);
    if (contains(c))
      return true;
  }
  return false;
}

bool UnicodeRangeSet::operator==(const UnicodeRangeSet& other) const {
  if (m_ranges.size() == 0 && other.size() == 0)
    return true;
  if (m_ranges.size() != other.size()) {
    return false;
  }
  bool equal = true;
  for (size_t i = 0; i < m_ranges.size(); ++i) {
    equal = equal && m_ranges[i] == other.m_ranges[i];
  }
  return equal;
}
}