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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 09:06:44 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 09:06:44 +0000
commited5640d8b587fbcfed7dd7967f3de04b37a76f26 (patch)
tree7a5f7c6c9d02226d7471cb3cc8fbbf631b415303 /comphelper/source/misc/accessibletexthelper.cxx
parentInitial commit. (diff)
downloadlibreoffice-ed5640d8b587fbcfed7dd7967f3de04b37a76f26.tar.xz
libreoffice-ed5640d8b587fbcfed7dd7967f3de04b37a76f26.zip
Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'comphelper/source/misc/accessibletexthelper.cxx')
-rw-r--r--comphelper/source/misc/accessibletexthelper.cxx800
1 files changed, 800 insertions, 0 deletions
diff --git a/comphelper/source/misc/accessibletexthelper.cxx b/comphelper/source/misc/accessibletexthelper.cxx
new file mode 100644
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+++ b/comphelper/source/misc/accessibletexthelper.cxx
@@ -0,0 +1,800 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <comphelper/accessibletexthelper.hxx>
+#include <com/sun/star/accessibility/AccessibleTextType.hpp>
+#include <com/sun/star/i18n/BreakIterator.hpp>
+#include <com/sun/star/i18n/CharacterIteratorMode.hpp>
+#include <com/sun/star/i18n/CharacterClassification.hpp>
+#include <com/sun/star/i18n/WordType.hpp>
+#include <com/sun/star/i18n/KCharacterType.hpp>
+#include <com/sun/star/lang/IndexOutOfBoundsException.hpp>
+#include <comphelper/processfactory.hxx>
+#include <com/sun/star/accessibility/TextSegment.hpp>
+
+#include <algorithm>
+
+
+namespace comphelper
+{
+
+
+ using namespace ::com::sun::star;
+ using namespace ::com::sun::star::uno;
+ using namespace ::com::sun::star::lang;
+ using namespace ::com::sun::star::beans;
+ using namespace ::com::sun::star::accessibility;
+
+
+ // OCommonAccessibleText
+
+
+ OCommonAccessibleText::OCommonAccessibleText()
+ {
+ }
+
+
+ OCommonAccessibleText::~OCommonAccessibleText()
+ {
+ }
+
+
+ Reference < i18n::XBreakIterator > const & OCommonAccessibleText::implGetBreakIterator()
+ {
+ if ( !m_xBreakIter.is() )
+ {
+ Reference< uno::XComponentContext > xContext = ::comphelper::getProcessComponentContext();
+ m_xBreakIter = i18n::BreakIterator::create(xContext);
+ }
+
+ return m_xBreakIter;
+ }
+
+
+ Reference < i18n::XCharacterClassification > const & OCommonAccessibleText::implGetCharacterClassification()
+ {
+ if ( !m_xCharClass.is() )
+ {
+ m_xCharClass = i18n::CharacterClassification::create( ::comphelper::getProcessComponentContext() );
+ }
+
+ return m_xCharClass;
+ }
+
+
+ bool OCommonAccessibleText::implIsValidBoundary( i18n::Boundary const & rBoundary, sal_Int32 nLength )
+ {
+ return ( rBoundary.startPos >= 0 ) && ( rBoundary.startPos < nLength ) && ( rBoundary.endPos >= 0 ) && ( rBoundary.endPos <= nLength );
+ }
+
+
+ bool OCommonAccessibleText::implIsValidIndex( sal_Int32 nIndex, sal_Int32 nLength )
+ {
+ return ( nIndex >= 0 ) && ( nIndex < nLength );
+ }
+
+
+ bool OCommonAccessibleText::implIsValidRange( sal_Int32 nStartIndex, sal_Int32 nEndIndex, sal_Int32 nLength )
+ {
+ return ( nStartIndex >= 0 ) && ( nStartIndex <= nLength ) && ( nEndIndex >= 0 ) && ( nEndIndex <= nLength );
+ }
+
+
+ void OCommonAccessibleText::implGetGlyphBoundary( const OUString& rText, i18n::Boundary& rBoundary, sal_Int32 nIndex )
+ {
+ if ( implIsValidIndex( nIndex, rText.getLength() ) )
+ {
+ Reference < i18n::XBreakIterator > xBreakIter = implGetBreakIterator();
+ if ( xBreakIter.is() )
+ {
+ sal_Int32 nCount = 1;
+ sal_Int32 nDone;
+ sal_Int32 nStartIndex = xBreakIter->previousCharacters( rText, nIndex, implGetLocale(), i18n::CharacterIteratorMode::SKIPCELL, nCount, nDone );
+ if ( nDone != 0 )
+ nStartIndex = xBreakIter->nextCharacters( rText, nStartIndex, implGetLocale(), i18n::CharacterIteratorMode::SKIPCELL, nCount, nDone );
+ sal_Int32 nEndIndex = xBreakIter->nextCharacters( rText, nStartIndex, implGetLocale(), i18n::CharacterIteratorMode::SKIPCELL, nCount, nDone );
+ if ( nDone != 0 )
+ {
+ rBoundary.startPos = nStartIndex;
+ rBoundary.endPos = nEndIndex;
+ }
+ }
+ }
+ else
+ {
+ rBoundary.startPos = nIndex;
+ rBoundary.endPos = nIndex;
+ }
+ }
+
+
+ bool OCommonAccessibleText::implGetWordBoundary( const OUString& rText, i18n::Boundary& rBoundary, sal_Int32 nIndex )
+ {
+ bool bWord = false;
+
+ if ( implIsValidIndex( nIndex, rText.getLength() ) )
+ {
+ Reference < i18n::XBreakIterator > xBreakIter = implGetBreakIterator();
+ if ( xBreakIter.is() )
+ {
+ rBoundary = xBreakIter->getWordBoundary( rText, nIndex, implGetLocale(), i18n::WordType::ANY_WORD, true );
+
+ // it's a word, if the first character is an alpha-numeric character
+ Reference< i18n::XCharacterClassification > xCharClass = implGetCharacterClassification();
+ if ( xCharClass.is() )
+ {
+ sal_Int32 nType = xCharClass->getCharacterType( rText, rBoundary.startPos, implGetLocale() );
+ if ( ( nType & ( i18n::KCharacterType::LETTER | i18n::KCharacterType::DIGIT ) ) != 0 )
+ bWord = true;
+ }
+ }
+ }
+ else
+ {
+ rBoundary.startPos = nIndex;
+ rBoundary.endPos = nIndex;
+ }
+
+ return bWord;
+ }
+
+
+ void OCommonAccessibleText::implGetSentenceBoundary( const OUString& rText, i18n::Boundary& rBoundary, sal_Int32 nIndex )
+ {
+ if ( implIsValidIndex( nIndex, rText.getLength() ) )
+ {
+ Locale aLocale = implGetLocale();
+ Reference < i18n::XBreakIterator > xBreakIter = implGetBreakIterator();
+ if ( xBreakIter.is() )
+ {
+ rBoundary.endPos = xBreakIter->endOfSentence( rText, nIndex, aLocale );
+ rBoundary.startPos = xBreakIter->beginOfSentence( rText, rBoundary.endPos, aLocale );
+ }
+ }
+ else
+ {
+ rBoundary.startPos = nIndex;
+ rBoundary.endPos = nIndex;
+ }
+ }
+
+
+ void OCommonAccessibleText::implGetParagraphBoundary( const OUString& rText, i18n::Boundary& rBoundary, sal_Int32 nIndex )
+ {
+ if ( implIsValidIndex( nIndex, rText.getLength() ) )
+ {
+ rBoundary.startPos = 0;
+ rBoundary.endPos = rText.getLength();
+
+ sal_Int32 nFound = rText.lastIndexOf( '\n', nIndex );
+ if ( nFound != -1 )
+ rBoundary.startPos = nFound + 1;
+
+ nFound = rText.indexOf( '\n', nIndex );
+ if ( nFound != -1 )
+ rBoundary.endPos = nFound + 1;
+ }
+ else
+ {
+ rBoundary.startPos = nIndex;
+ rBoundary.endPos = nIndex;
+ }
+ }
+
+
+ void OCommonAccessibleText::implGetLineBoundary( const OUString& rText, i18n::Boundary& rBoundary, sal_Int32 nIndex )
+ {
+ sal_Int32 nLength = rText.getLength();
+
+ if ( implIsValidIndex( nIndex, nLength ) || nIndex == nLength )
+ {
+ rBoundary.startPos = 0;
+ rBoundary.endPos = nLength;
+ }
+ else
+ {
+ rBoundary.startPos = nIndex;
+ rBoundary.endPos = nIndex;
+ }
+ }
+
+
+ sal_Unicode OCommonAccessibleText::implGetCharacter( std::u16string_view rText, sal_Int32 nIndex )
+ {
+ if ( !implIsValidIndex( nIndex, rText.size() ) )
+ throw IndexOutOfBoundsException();
+
+ return rText[nIndex];
+ }
+
+ OUString OCommonAccessibleText::getSelectedText()
+ {
+ OUString sText;
+ sal_Int32 nStartIndex;
+ sal_Int32 nEndIndex;
+
+ implGetSelection( nStartIndex, nEndIndex );
+
+ try
+ {
+ sText = implGetTextRange( implGetText(), nStartIndex, nEndIndex );
+ }
+ catch ( IndexOutOfBoundsException& )
+ {
+ }
+
+ return sText;
+ }
+
+
+ sal_Int32 OCommonAccessibleText::getSelectionStart()
+ {
+ sal_Int32 nStartIndex;
+ sal_Int32 nEndIndex;
+
+ implGetSelection( nStartIndex, nEndIndex );
+
+ return nStartIndex;
+ }
+
+
+ sal_Int32 OCommonAccessibleText::getSelectionEnd()
+ {
+ sal_Int32 nStartIndex;
+ sal_Int32 nEndIndex;
+
+ implGetSelection( nStartIndex, nEndIndex );
+
+ return nEndIndex;
+ }
+
+
+ OUString OCommonAccessibleText::implGetTextRange( std::u16string_view rText, sal_Int32 nStartIndex, sal_Int32 nEndIndex )
+ {
+
+ if ( !implIsValidRange( nStartIndex, nEndIndex, rText.size() ) )
+ throw IndexOutOfBoundsException();
+
+ sal_Int32 nMinIndex = std::min( nStartIndex, nEndIndex );
+ sal_Int32 nMaxIndex = std::max( nStartIndex, nEndIndex );
+
+ return OUString(rText.substr( nMinIndex, nMaxIndex - nMinIndex ));
+ }
+
+ TextSegment OCommonAccessibleText::getTextAtIndex( sal_Int32 nIndex, sal_Int16 aTextType )
+ {
+ OUString sText( implGetText() );
+ sal_Int32 nLength = sText.getLength();
+
+ if ( !implIsValidIndex( nIndex, nLength ) && nIndex != nLength )
+ throw IndexOutOfBoundsException();
+
+ i18n::Boundary aBoundary;
+ TextSegment aResult;
+ aResult.SegmentStart = -1;
+ aResult.SegmentEnd = -1;
+
+ switch ( aTextType )
+ {
+ case AccessibleTextType::CHARACTER:
+ {
+ if ( implIsValidIndex( nIndex, nLength ) )
+ {
+ aResult.SegmentText = sText.copy( nIndex, 1 );
+ aResult.SegmentStart = nIndex;
+ aResult.SegmentEnd = nIndex+1;
+ }
+ }
+ break;
+ case AccessibleTextType::GLYPH:
+ {
+ // get glyph at index
+ implGetGlyphBoundary( sText, aBoundary, nIndex );
+ if ( implIsValidBoundary( aBoundary, nLength ) )
+ {
+ aResult.SegmentText = sText.copy( aBoundary.startPos, aBoundary.endPos - aBoundary.startPos );
+ aResult.SegmentStart = aBoundary.startPos;
+ aResult.SegmentEnd = aBoundary.endPos;
+ }
+ }
+ break;
+ case AccessibleTextType::WORD:
+ {
+ // get word at index
+ bool bWord = implGetWordBoundary( sText, aBoundary, nIndex );
+ if ( bWord && implIsValidBoundary( aBoundary, nLength ) )
+ {
+ aResult.SegmentText = sText.copy( aBoundary.startPos, aBoundary.endPos - aBoundary.startPos );
+ aResult.SegmentStart = aBoundary.startPos;
+ aResult.SegmentEnd = aBoundary.endPos;
+ }
+ }
+ break;
+ case AccessibleTextType::SENTENCE:
+ {
+ // get sentence at index
+ implGetSentenceBoundary( sText, aBoundary, nIndex );
+ if ( implIsValidBoundary( aBoundary, nLength ) )
+ {
+ aResult.SegmentText = sText.copy( aBoundary.startPos, aBoundary.endPos - aBoundary.startPos );
+ aResult.SegmentStart = aBoundary.startPos;
+ aResult.SegmentEnd = aBoundary.endPos;
+ }
+ }
+ break;
+ case AccessibleTextType::PARAGRAPH:
+ {
+ // get paragraph at index
+ implGetParagraphBoundary( sText, aBoundary, nIndex );
+ if ( implIsValidBoundary( aBoundary, nLength ) )
+ {
+ aResult.SegmentText = sText.copy( aBoundary.startPos, aBoundary.endPos - aBoundary.startPos );
+ aResult.SegmentStart = aBoundary.startPos;
+ aResult.SegmentEnd = aBoundary.endPos;
+ }
+ }
+ break;
+ case AccessibleTextType::LINE:
+ {
+ // get line at index
+ implGetLineBoundary( sText, aBoundary, nIndex );
+ if ( implIsValidBoundary( aBoundary, nLength ) )
+ {
+ aResult.SegmentText = sText.copy( aBoundary.startPos, aBoundary.endPos - aBoundary.startPos );
+ aResult.SegmentStart = aBoundary.startPos;
+ aResult.SegmentEnd = aBoundary.endPos;
+ }
+ }
+ break;
+ case AccessibleTextType::ATTRIBUTE_RUN:
+ {
+ // TODO: implGetAttributeRunBoundary() (incompatible!)
+
+ aResult.SegmentText = sText;
+ aResult.SegmentStart = 0;
+ aResult.SegmentEnd = nLength;
+ }
+ break;
+ default:
+ {
+ // unknown text type
+ }
+ }
+
+ return aResult;
+ }
+
+
+ TextSegment OCommonAccessibleText::getTextBeforeIndex( sal_Int32 nIndex, sal_Int16 aTextType )
+ {
+ OUString sText( implGetText() );
+ sal_Int32 nLength = sText.getLength();
+
+ if ( !implIsValidIndex( nIndex, nLength ) && nIndex != nLength )
+ throw IndexOutOfBoundsException();
+
+ i18n::Boundary aBoundary;
+ TextSegment aResult;
+ aResult.SegmentStart = -1;
+ aResult.SegmentEnd = -1;
+
+ switch ( aTextType )
+ {
+ case AccessibleTextType::CHARACTER:
+ {
+ if ( implIsValidIndex( nIndex - 1, nLength ) )
+ {
+ aResult.SegmentText = sText.copy( nIndex - 1, 1 );
+ aResult.SegmentStart = nIndex-1;
+ aResult.SegmentEnd = nIndex;
+ }
+ }
+ break;
+ case AccessibleTextType::GLYPH:
+ {
+ // get glyph at index
+ implGetGlyphBoundary( sText, aBoundary, nIndex );
+ // get previous glyph
+ if ( aBoundary.startPos > 0 )
+ {
+ implGetGlyphBoundary( sText, aBoundary, aBoundary.startPos - 1 );
+ if ( implIsValidBoundary( aBoundary, nLength ) )
+ {
+ aResult.SegmentText = sText.copy( aBoundary.startPos, aBoundary.endPos - aBoundary.startPos );
+ aResult.SegmentStart = aBoundary.startPos;
+ aResult.SegmentEnd = aBoundary.endPos;
+ }
+ }
+ }
+ break;
+ case AccessibleTextType::WORD:
+ {
+ // get word at index
+ implGetWordBoundary( sText, aBoundary, nIndex );
+ // get previous word
+ bool bWord = false;
+ while ( !bWord && aBoundary.startPos > 0 )
+ bWord = implGetWordBoundary( sText, aBoundary, aBoundary.startPos - 1 );
+ if ( bWord && implIsValidBoundary( aBoundary, nLength ) )
+ {
+ aResult.SegmentText = sText.copy( aBoundary.startPos, aBoundary.endPos - aBoundary.startPos );
+ aResult.SegmentStart = aBoundary.startPos;
+ aResult.SegmentEnd = aBoundary.endPos;
+ }
+ }
+ break;
+ case AccessibleTextType::SENTENCE:
+ {
+ // get sentence at index
+ implGetSentenceBoundary( sText, aBoundary, nIndex );
+ // get previous sentence
+ if ( aBoundary.startPos > 0 )
+ {
+ implGetSentenceBoundary( sText, aBoundary, aBoundary.startPos - 1 );
+ if ( implIsValidBoundary( aBoundary, nLength ) )
+ {
+ aResult.SegmentText = sText.copy( aBoundary.startPos, aBoundary.endPos - aBoundary.startPos );
+ aResult.SegmentStart = aBoundary.startPos;
+ aResult.SegmentEnd = aBoundary.endPos;
+ }
+ }
+ }
+ break;
+ case AccessibleTextType::PARAGRAPH:
+ {
+ // get paragraph at index
+ implGetParagraphBoundary( sText, aBoundary, nIndex );
+ // get previous paragraph
+ if ( aBoundary.startPos > 0 )
+ {
+ implGetParagraphBoundary( sText, aBoundary, aBoundary.startPos - 1 );
+ if ( implIsValidBoundary( aBoundary, nLength ) )
+ {
+ aResult.SegmentText = sText.copy( aBoundary.startPos, aBoundary.endPos - aBoundary.startPos );
+ aResult.SegmentStart = aBoundary.startPos;
+ aResult.SegmentEnd = aBoundary.endPos;
+ }
+ }
+ }
+ break;
+ case AccessibleTextType::LINE:
+ {
+ // get line at index
+ implGetLineBoundary( sText, aBoundary, nIndex );
+ // get previous line
+ if ( aBoundary.startPos > 0 )
+ {
+ implGetLineBoundary( sText, aBoundary, aBoundary.startPos - 1 );
+ if ( implIsValidBoundary( aBoundary, nLength ) )
+ {
+ aResult.SegmentText = sText.copy( aBoundary.startPos, aBoundary.endPos - aBoundary.startPos );
+ aResult.SegmentStart = aBoundary.startPos;
+ aResult.SegmentEnd = aBoundary.endPos;
+ }
+ }
+ }
+ break;
+ case AccessibleTextType::ATTRIBUTE_RUN:
+ {
+ // TODO: implGetAttributeRunBoundary() (incompatible!)
+ }
+ break;
+ default:
+ {
+ // unknown text type
+ }
+ }
+
+ return aResult;
+ }
+
+
+ TextSegment OCommonAccessibleText::getTextBehindIndex( sal_Int32 nIndex, sal_Int16 aTextType )
+ {
+ OUString sText( implGetText() );
+ sal_Int32 nLength = sText.getLength();
+
+ if ( !implIsValidIndex( nIndex, nLength ) && nIndex != nLength )
+ throw IndexOutOfBoundsException();
+
+ i18n::Boundary aBoundary;
+ TextSegment aResult;
+ aResult.SegmentStart = -1;
+ aResult.SegmentEnd = -1;
+
+ switch ( aTextType )
+ {
+ case AccessibleTextType::CHARACTER:
+ {
+ if ( implIsValidIndex( nIndex + 1, nLength ) )
+ {
+ aResult.SegmentText = sText.copy( nIndex + 1, 1 );
+ aResult.SegmentStart = nIndex+1;
+ aResult.SegmentEnd = nIndex+2;
+ }
+ }
+ break;
+ case AccessibleTextType::GLYPH:
+ {
+ // get glyph at index
+ implGetGlyphBoundary( sText, aBoundary, nIndex );
+ // get next glyph
+ if ( aBoundary.endPos < nLength )
+ {
+ implGetGlyphBoundary( sText, aBoundary, aBoundary.endPos );
+ if ( implIsValidBoundary( aBoundary, nLength ) )
+ {
+ aResult.SegmentText = sText.copy( aBoundary.startPos, aBoundary.endPos - aBoundary.startPos );
+ aResult.SegmentStart = aBoundary.startPos;
+ aResult.SegmentEnd = aBoundary.endPos;
+ }
+ }
+ }
+ break;
+ case AccessibleTextType::WORD:
+ {
+ // get word at index
+ implGetWordBoundary( sText, aBoundary, nIndex );
+ // get next word
+ bool bWord = false;
+ while ( !bWord && aBoundary.endPos < nLength )
+ bWord = implGetWordBoundary( sText, aBoundary, aBoundary.endPos );
+ if ( bWord && implIsValidBoundary( aBoundary, nLength ) )
+ {
+ aResult.SegmentText = sText.copy( aBoundary.startPos, aBoundary.endPos - aBoundary.startPos );
+ aResult.SegmentStart = aBoundary.startPos;
+ aResult.SegmentEnd = aBoundary.endPos;
+ }
+ }
+ break;
+ case AccessibleTextType::SENTENCE:
+ {
+ // get sentence at index
+ implGetSentenceBoundary( sText, aBoundary, nIndex );
+ // get next sentence
+ sal_Int32 nEnd = aBoundary.endPos;
+ sal_Int32 nI = aBoundary.endPos;
+ bool bFound = false;
+ while ( !bFound && ++nI < nLength )
+ {
+ implGetSentenceBoundary( sText, aBoundary, nI );
+ bFound = ( aBoundary.endPos > nEnd );
+ }
+ if ( bFound && implIsValidBoundary( aBoundary, nLength ) )
+ {
+ aResult.SegmentText = sText.copy( aBoundary.startPos, aBoundary.endPos - aBoundary.startPos );
+ aResult.SegmentStart = aBoundary.startPos;
+ aResult.SegmentEnd = aBoundary.endPos;
+ }
+ }
+ break;
+ case AccessibleTextType::PARAGRAPH:
+ {
+ // get paragraph at index
+ implGetParagraphBoundary( sText, aBoundary, nIndex );
+ // get next paragraph
+ if ( aBoundary.endPos < nLength )
+ {
+ implGetParagraphBoundary( sText, aBoundary, aBoundary.endPos );
+ if ( implIsValidBoundary( aBoundary, nLength ) )
+ {
+ aResult.SegmentText = sText.copy( aBoundary.startPos, aBoundary.endPos - aBoundary.startPos );
+ aResult.SegmentStart = aBoundary.startPos;
+ aResult.SegmentEnd = aBoundary.endPos;
+ }
+ }
+ }
+ break;
+ case AccessibleTextType::LINE:
+ {
+ // get line at index
+ implGetLineBoundary( sText, aBoundary, nIndex );
+ // get next line
+ if ( aBoundary.endPos < nLength )
+ {
+ implGetLineBoundary( sText, aBoundary, aBoundary.endPos );
+ if ( implIsValidBoundary( aBoundary, nLength ) )
+ {
+ aResult.SegmentText = sText.copy( aBoundary.startPos, aBoundary.endPos - aBoundary.startPos );
+ aResult.SegmentStart = aBoundary.startPos;
+ aResult.SegmentEnd = aBoundary.endPos;
+ }
+ }
+ }
+ break;
+ case AccessibleTextType::ATTRIBUTE_RUN:
+ {
+ // TODO: implGetAttributeRunBoundary() (incompatible!)
+ }
+ break;
+ default:
+ {
+ // unknown text type
+ }
+ }
+
+ return aResult;
+ }
+
+
+ bool OCommonAccessibleText::implInitTextChangedEvent(
+ std::u16string_view rOldString,
+ std::u16string_view rNewString,
+ css::uno::Any& rDeleted,
+ css::uno::Any& rInserted) // throw()
+ {
+ size_t nLenOld = rOldString.size();
+ size_t nLenNew = rNewString.size();
+
+ // equal
+ if ((0 == nLenOld) && (0 == nLenNew))
+ return false;
+
+ TextSegment aDeletedText;
+ TextSegment aInsertedText;
+
+ aDeletedText.SegmentStart = -1;
+ aDeletedText.SegmentEnd = -1;
+ aInsertedText.SegmentStart = -1;
+ aInsertedText.SegmentEnd = -1;
+
+ // insert only
+ if ((0 == nLenOld) && (nLenNew > 0))
+ {
+ aInsertedText.SegmentStart = 0;
+ aInsertedText.SegmentEnd = nLenNew;
+ aInsertedText.SegmentText = rNewString.substr( aInsertedText.SegmentStart, aInsertedText.SegmentEnd - aInsertedText.SegmentStart );
+
+ rInserted <<= aInsertedText;
+ return true;
+ }
+
+ // delete only
+ if ((nLenOld > 0) && (0 == nLenNew))
+ {
+ aDeletedText.SegmentStart = 0;
+ aDeletedText.SegmentEnd = nLenOld;
+ aDeletedText.SegmentText = rOldString.substr( aDeletedText.SegmentStart, aDeletedText.SegmentEnd - aDeletedText.SegmentStart );
+
+ rDeleted <<= aDeletedText;
+ return true;
+ }
+
+ auto pFirstDiffOld = rOldString.begin();
+ auto pLastDiffOld = rOldString.end();
+ auto pFirstDiffNew = rNewString.begin();
+ auto pLastDiffNew = rNewString.end();
+
+ // find first difference
+ while ((pFirstDiffOld < pLastDiffOld) && (pFirstDiffNew < pLastDiffNew)
+ && (*pFirstDiffOld == *pFirstDiffNew))
+ {
+ pFirstDiffOld++;
+ pFirstDiffNew++;
+ }
+
+ // equality test
+ if (pFirstDiffOld == pLastDiffOld && pFirstDiffNew == pLastDiffNew)
+ return false;
+
+ // find last difference
+ while ( ( pLastDiffOld > pFirstDiffOld) &&
+ ( pLastDiffNew > pFirstDiffNew) &&
+ (pLastDiffOld[-1] == pLastDiffNew[-1]))
+ {
+ pLastDiffOld--;
+ pLastDiffNew--;
+ }
+
+ if (pFirstDiffOld < pLastDiffOld)
+ {
+ aDeletedText.SegmentStart = pFirstDiffOld - rOldString.begin();
+ aDeletedText.SegmentEnd = pLastDiffOld - rOldString.begin();
+ aDeletedText.SegmentText = rOldString.substr( aDeletedText.SegmentStart, aDeletedText.SegmentEnd - aDeletedText.SegmentStart );
+
+ rDeleted <<= aDeletedText;
+ }
+
+ if (pFirstDiffNew < pLastDiffNew)
+ {
+ aInsertedText.SegmentStart = pFirstDiffNew - rNewString.begin();
+ aInsertedText.SegmentEnd = pLastDiffNew - rNewString.begin();
+ aInsertedText.SegmentText = rNewString.substr( aInsertedText.SegmentStart, aInsertedText.SegmentEnd - aInsertedText.SegmentStart );
+
+ rInserted <<= aInsertedText;
+ }
+ return true;
+ }
+
+
+ // OAccessibleTextHelper
+
+
+ OAccessibleTextHelper::OAccessibleTextHelper( )
+ {
+ }
+
+
+ // XInterface
+
+
+ IMPLEMENT_FORWARD_XINTERFACE2( OAccessibleTextHelper, OAccessibleExtendedComponentHelper, OAccessibleTextHelper_Base )
+
+
+ // XTypeProvider
+
+
+ IMPLEMENT_FORWARD_XTYPEPROVIDER2( OAccessibleTextHelper, OAccessibleExtendedComponentHelper, OAccessibleTextHelper_Base )
+
+
+ // XAccessibleText
+
+
+ OUString OAccessibleTextHelper::getSelectedText()
+ {
+ OExternalLockGuard aGuard( this );
+
+ return OCommonAccessibleText::getSelectedText();
+ }
+
+
+ sal_Int32 OAccessibleTextHelper::getSelectionStart()
+ {
+ OExternalLockGuard aGuard( this );
+
+ return OCommonAccessibleText::getSelectionStart();
+ }
+
+
+ sal_Int32 OAccessibleTextHelper::getSelectionEnd()
+ {
+ OExternalLockGuard aGuard( this );
+
+ return OCommonAccessibleText::getSelectionEnd();
+ }
+
+
+ TextSegment OAccessibleTextHelper::getTextAtIndex( sal_Int32 nIndex, sal_Int16 aTextType )
+ {
+ OExternalLockGuard aGuard( this );
+
+ return OCommonAccessibleText::getTextAtIndex( nIndex, aTextType );
+ }
+
+
+ TextSegment OAccessibleTextHelper::getTextBeforeIndex( sal_Int32 nIndex, sal_Int16 aTextType )
+ {
+ OExternalLockGuard aGuard( this );
+
+ return OCommonAccessibleText::getTextBeforeIndex( nIndex, aTextType );
+ }
+
+
+ TextSegment OAccessibleTextHelper::getTextBehindIndex( sal_Int32 nIndex, sal_Int16 aTextType )
+ {
+ OExternalLockGuard aGuard( this );
+
+ return OCommonAccessibleText::getTextBehindIndex( nIndex, aTextType );
+ }
+
+
+} // namespace comphelper
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */