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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "SmallCapsIterator.h"
#include <unicode/utypes.h>
namespace blink {
SmallCapsIterator::SmallCapsIterator(const UChar* buffer, unsigned bufferSize)
: m_utf16Iterator(adoptPtr(new UTF16TextIterator(buffer, bufferSize)))
, m_bufferSize(bufferSize)
, m_nextUChar32(0)
, m_atEnd(bufferSize == 0)
, m_currentSmallCapsBehavior(SmallCapsInvalid)
{
}
bool SmallCapsIterator::consume(unsigned *capsLimit, SmallCapsBehavior* smallCapsBehavior)
{
if (m_atEnd)
return false;
while (m_utf16Iterator->consume(m_nextUChar32)) {
m_previousSmallCapsBehavior = m_currentSmallCapsBehavior;
// Skipping over combining marks, as these combine with the small-caps
// uppercased text as well and we do not need to split by their
// individual case-ness.
if (!u_getCombiningClass(m_nextUChar32)) {
m_currentSmallCapsBehavior = u_hasBinaryProperty(m_nextUChar32, UCHAR_CHANGES_WHEN_UPPERCASED)
? SmallCapsUppercaseNeeded
: SmallCapsSameCase;
}
if (m_previousSmallCapsBehavior != m_currentSmallCapsBehavior
&& m_previousSmallCapsBehavior != SmallCapsInvalid) {
*capsLimit = m_utf16Iterator->offset();
*smallCapsBehavior = m_previousSmallCapsBehavior;
return true;
}
m_utf16Iterator->advance();
}
*capsLimit = m_bufferSize;
*smallCapsBehavior = m_currentSmallCapsBehavior;
m_atEnd = true;
return true;
}
} // namespace blink
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