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See the License for the * specific language governing permissions and limitations * under the License. * *************************************************************/ #include "conditionalexpression.hxx" /** === begin UNO includes === **/ /** === end UNO includes === **/ //........................................................................ namespace rptui { //........................................................................ /** === begin UNO using === **/ /** === end UNO using === **/ // ============================================================================= // = ConditionalExpression // ============================================================================= // ----------------------------------------------------------------------------- ConditionalExpression::ConditionalExpression( const sal_Char* _pAsciiPattern ) :m_sPattern( ::rtl::OUString::createFromAscii( _pAsciiPattern ) ) { } // ----------------------------------------------------------------------------- ::rtl::OUString ConditionalExpression::assembleExpression( const ::rtl::OUString& _rFieldDataSource, const ::rtl::OUString& _rLHS, const ::rtl::OUString& _rRHS ) const { ::rtl::OUString sExpression( m_sPattern ); sal_Int32 nPatternIndex = sExpression.indexOf( '$' ); while ( nPatternIndex > -1 ) { const ::rtl::OUString* pReplace = NULL; switch ( sExpression.getStr()[ nPatternIndex + 1 ] ) { case '$': pReplace = &_rFieldDataSource; break; case '1': pReplace = &_rLHS; break; case '2': pReplace = &_rRHS; break; default: break; } if ( pReplace == NULL ) { OSL_ENSURE( false, "ConditionalExpression::assembleExpression: illegal pattern!" ); break; } sExpression = sExpression.replaceAt( nPatternIndex, 2, *pReplace ); nPatternIndex = sExpression.indexOf( '$', nPatternIndex + pReplace->getLength() + 1 ); } return sExpression; } // ----------------------------------------------------------------------------- bool ConditionalExpression::matchExpression( const ::rtl::OUString& _rExpression, const ::rtl::OUString& _rFieldDataSource, ::rtl::OUString& _out_rLHS, ::rtl::OUString& _out_rRHS ) const { (void)_rExpression; (void)_rFieldDataSource; (void)_out_rLHS; (void)_out_rRHS; // if we had regular expression, the matching would be pretty easy ... // just replace $1 and $2 in the pattern with (.*), and then get them with \1 resp. \2. // Unfortunately, we don't have such a regexp engine ... // Okay, let's start with replacing all $$ in our pattern with the actual field data source ::rtl::OUString sMatchExpression( m_sPattern ); const ::rtl::OUString sFieldDataPattern( RTL_CONSTASCII_USTRINGPARAM( "$$" ) ); sal_Int32 nIndex( sMatchExpression.indexOf( sFieldDataPattern ) ); while ( nIndex != -1 ) { sMatchExpression = sMatchExpression.replaceAt( nIndex, sFieldDataPattern.getLength(), _rFieldDataSource ); nIndex = sMatchExpression.indexOf( sFieldDataPattern, nIndex + _rFieldDataSource.getLength() ); } const ::rtl::OUString sLHSPattern( RTL_CONSTASCII_USTRINGPARAM( "$1" ) ); const ::rtl::OUString sRHSPattern( RTL_CONSTASCII_USTRINGPARAM( "$2" ) ); sal_Int32 nLHSIndex( sMatchExpression.indexOf( sLHSPattern ) ); sal_Int32 nRHSIndex( sMatchExpression.indexOf( sRHSPattern ) ); // now we should have at most one occurance of $1 and $2, resp. OSL_ENSURE( sMatchExpression.indexOf( sLHSPattern, nLHSIndex + 1 ) == -1, "ConditionalExpression::matchExpression: unsupported pattern (more than one LHS occurance)!" ); OSL_ENSURE( sMatchExpression.indexOf( sRHSPattern, nRHSIndex + 1 ) == -1, "ConditionalExpression::matchExpression: unsupported pattern (more than one RHS occurance)!" ); // Also, an LHS must be present, and precede the RHS (if present) OSL_ENSURE( ( nLHSIndex != -1 ) && ( ( nLHSIndex < nRHSIndex ) || ( nRHSIndex == -1 ) ), "ConditionalExpression::matchExpression: no LHS, or an RHS preceeding the LHS - this is not supported!" ); // up to the occurance of the LHS (which must exist, see above), the two expressions // must be identical if ( _rExpression.getLength() < nLHSIndex ) return false; const ::rtl::OUString sExprPart1( _rExpression.copy( 0, nLHSIndex ) ); const ::rtl::OUString sMatchExprPart1( sMatchExpression.copy( 0, nLHSIndex ) ); if ( sExprPart1 != sMatchExprPart1 ) // the left-most expression parts do not match return false; // after the occurance of the RHS (or the LHS, if there is no RHS), the two expressions // must be identical, too bool bHaveRHS( nRHSIndex != -1 ); sal_Int32 nRightMostIndex( bHaveRHS ? nRHSIndex : nLHSIndex ); const ::rtl::OUString sMatchExprPart3( sMatchExpression.copy( nRightMostIndex + 2 ) ); if ( _rExpression.getLength() < sMatchExprPart3.getLength() ) // the expression is not even long enough to hold the right-most part of the match expression return false; const ::rtl::OUString sExprPart3( _rExpression.copy( _rExpression.getLength() - sMatchExprPart3.getLength() ) ); if ( sExprPart3 != sMatchExprPart3 ) // the right-most expression parts do not match return false; // if we don't have an RHS, we're done if ( !bHaveRHS ) { _out_rLHS = _rExpression.copy( sExprPart1.getLength(), _rExpression.getLength() - sExprPart1.getLength() - sExprPart3.getLength() ); return true; } // strip the match expression by its right-most and left-most part, and by the placeholders $1 and $2 sal_Int32 nMatchExprPart2Start( nLHSIndex + sLHSPattern.getLength() ); ::rtl::OUString sMatchExprPart2 = sMatchExpression.copy( nMatchExprPart2Start, sMatchExpression.getLength() - nMatchExprPart2Start - sMatchExprPart3.getLength() - 2 ); // strip the expression by its left-most and right-most part const ::rtl::OUString sExpression( _rExpression.copy( sExprPart1.getLength(), _rExpression.getLength() - sExprPart1.getLength() - sExprPart3.getLength() ) ); sal_Int32 nPart2Index = sExpression.indexOf( sMatchExprPart2 ); if ( nPart2Index == -1 ) // the "middle" part of the match expression does not exist in the expression at all return false; OSL_ENSURE( sExpression.indexOf( sMatchExprPart2, nPart2Index + 1 ) == -1, "ConditionalExpression::matchExpression: ambiguous matching!" ); // if this fires, then we're lost: The middle part exists two times in the expression, // so we cannot reliably determine what's the LHS and what's the RHS. // Well, the whole mechanism is flawed, anyway: // Encoding the field content in the conditional expression will break as soon // as somebody // - assigns a Data Field to a control // - creates a conditional format expression for the control // - assigns another Data Field to the control // - opens the Conditional Format Dialog, again // Here, at the latest, you can see that we need another mechanism, anyway, which does not // rely on those strange expression building/matching _out_rLHS = sExpression.copy( 0, nPart2Index ); _out_rRHS = sExpression.copy( nPart2Index + sMatchExprPart2.getLength() ); return true; } // ============================================================================= // = ConditionalExpressionFactory // ============================================================================= // ----------------------------------------------------------------------------- size_t ConditionalExpressionFactory::getKnownConditionalExpressions( ConditionalExpressions& _out_rCondExp ) { ConditionalExpressions aEmpty; _out_rCondExp.swap( aEmpty ); _out_rCondExp[ eBetween ] = PConditionalExpression( new ConditionalExpression( "AND( ( $$ ) >= ( $1 ); ( $$ ) <= ( $2 ) )" ) ); _out_rCondExp[ eNotBetween ] = PConditionalExpression( new ConditionalExpression( "NOT( AND( ( $$ ) >= ( $1 ); ( $$ ) <= ( $2 ) ) )" ) ); _out_rCondExp[ eEqualTo ] = PConditionalExpression( new ConditionalExpression( "( $$ ) = ( $1 )" ) ); _out_rCondExp[ eNotEqualTo ] = PConditionalExpression( new ConditionalExpression( "( $$ ) <> ( $1 )" ) ); _out_rCondExp[ eGreaterThan ] = PConditionalExpression( new ConditionalExpression( "( $$ ) > ( $1 )" ) ); _out_rCondExp[ eLessThan ] = PConditionalExpression( new ConditionalExpression( "( $$ ) < ( $1 )" ) ); _out_rCondExp[ eGreaterOrEqual ] = PConditionalExpression( new ConditionalExpression( "( $$ ) >= ( $1 )" ) ); _out_rCondExp[ eLessOrEqual ] = PConditionalExpression( new ConditionalExpression( "( $$ ) <= ( $1 )" ) ); return _out_rCondExp.size(); } //........................................................................ } // namespace rptui //........................................................................