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83 lines
2.5 KiB
83 lines
2.5 KiB
// Copyright 2014 PDFium Authors. All rights reserved. |
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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 "core/fxcrt/fx_ucd.h" |
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#include <algorithm> |
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CFX_BidiChar::CFX_BidiChar() |
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: m_CurrentSegment({0, 0, NEUTRAL}), m_LastSegment({0, 0, NEUTRAL}) {} |
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bool CFX_BidiChar::AppendChar(FX_WCHAR wch) { |
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uint32_t dwProps = FX_GetUnicodeProperties(wch); |
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int32_t iBidiCls = (dwProps & FX_BIDICLASSBITSMASK) >> FX_BIDICLASSBITS; |
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Direction direction = NEUTRAL; |
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switch (iBidiCls) { |
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case FX_BIDICLASS_L: |
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case FX_BIDICLASS_AN: |
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case FX_BIDICLASS_EN: |
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direction = LEFT; |
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break; |
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case FX_BIDICLASS_R: |
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case FX_BIDICLASS_AL: |
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direction = RIGHT; |
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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(NEUTRAL); |
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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 CFX_WideString& str) |
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: m_Str(str), |
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m_pBidiChar(new CFX_BidiChar), |
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m_eOverallDirection(CFX_BidiChar::LEFT) { |
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for (int i = 0; i < m_Str.GetLength(); ++i) { |
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if (m_pBidiChar->AppendChar(m_Str.GetAt(i))) |
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m_Order.push_back(m_pBidiChar->GetSegmentInfo()); |
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} |
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if (m_pBidiChar->EndChar()) |
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m_Order.push_back(m_pBidiChar->GetSegmentInfo()); |
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size_t nR2L = std::count_if(m_Order.begin(), m_Order.end(), |
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[](const CFX_BidiChar::Segment& seg) { |
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return seg.direction == CFX_BidiChar::RIGHT; |
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}); |
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size_t nL2R = std::count_if(m_Order.begin(), m_Order.end(), |
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[](const CFX_BidiChar::Segment& seg) { |
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return seg.direction == CFX_BidiChar::LEFT; |
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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() {} |
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void CFX_BidiString::SetOverallDirectionRight() { |
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if (m_eOverallDirection != CFX_BidiChar::RIGHT) { |
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std::reverse(m_Order.begin(), m_Order.end()); |
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m_eOverallDirection = CFX_BidiChar::RIGHT; |
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} |
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}
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