99 lines
2.8 KiB
C++
99 lines
2.8 KiB
C++
// Copyright 2014 The PDFium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
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#include "core/fxcrt/fx_bidi.h"
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#include <algorithm>
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#include "core/fxcrt/fx_unicode.h"
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#include "third_party/base/check_op.h"
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CFX_BidiChar::CFX_BidiChar()
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: m_CurrentSegment({0, 0, Direction::kNeutral}),
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m_LastSegment({0, 0, Direction::kNeutral}) {}
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bool CFX_BidiChar::AppendChar(wchar_t wch) {
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Direction direction;
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switch (pdfium::unicode::GetBidiClass(wch)) {
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case FX_BIDICLASS::kL:
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direction = Direction::kLeft;
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break;
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case FX_BIDICLASS::kAN:
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case FX_BIDICLASS::kEN:
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case FX_BIDICLASS::kNSM:
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case FX_BIDICLASS::kCS:
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case FX_BIDICLASS::kES:
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case FX_BIDICLASS::kET:
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case FX_BIDICLASS::kBN:
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direction = Direction::kLeftWeak;
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break;
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case FX_BIDICLASS::kR:
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case FX_BIDICLASS::kAL:
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direction = Direction::kRight;
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break;
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default:
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direction = Direction::kNeutral;
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break;
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}
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bool bChangeDirection = (direction != m_CurrentSegment.direction);
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if (bChangeDirection)
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StartNewSegment(direction);
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m_CurrentSegment.count++;
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return bChangeDirection;
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}
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bool CFX_BidiChar::EndChar() {
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StartNewSegment(Direction::kNeutral);
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return m_LastSegment.count > 0;
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}
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void CFX_BidiChar::StartNewSegment(CFX_BidiChar::Direction direction) {
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m_LastSegment = m_CurrentSegment;
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m_CurrentSegment.start += m_CurrentSegment.count;
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m_CurrentSegment.count = 0;
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m_CurrentSegment.direction = direction;
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}
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CFX_BidiString::CFX_BidiString(const WideString& str) : m_Str(str) {
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CFX_BidiChar bidi;
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for (wchar_t c : m_Str) {
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if (bidi.AppendChar(c))
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m_Order.push_back(bidi.GetSegmentInfo());
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}
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if (bidi.EndChar())
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m_Order.push_back(bidi.GetSegmentInfo());
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size_t nR2L = std::count_if(
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m_Order.begin(), m_Order.end(), [](const CFX_BidiChar::Segment& seg) {
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return seg.direction == CFX_BidiChar::Direction::kRight;
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});
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size_t nL2R = std::count_if(
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m_Order.begin(), m_Order.end(), [](const CFX_BidiChar::Segment& seg) {
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return seg.direction == CFX_BidiChar::Direction::kLeft;
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});
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if (nR2L > 0 && nR2L >= nL2R)
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SetOverallDirectionRight();
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}
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CFX_BidiString::~CFX_BidiString() = default;
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CFX_BidiChar::Direction CFX_BidiString::OverallDirection() const {
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DCHECK_NE(m_eOverallDirection, CFX_BidiChar::Direction::kNeutral);
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DCHECK_NE(m_eOverallDirection, CFX_BidiChar::Direction::kLeftWeak);
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return m_eOverallDirection;
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}
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void CFX_BidiString::SetOverallDirectionRight() {
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if (m_eOverallDirection != CFX_BidiChar::Direction::kRight) {
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std::reverse(m_Order.begin(), m_Order.end());
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m_eOverallDirection = CFX_BidiChar::Direction::kRight;
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}
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}
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