118 lines
4.9 KiB
C++
118 lines
4.9 KiB
C++
/*
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__________ ____ ___
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_____ __ _\______ \_____ _______ ______ __________\ \/ /
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/ \| | \ ___/\__ \\_ __ \/ ___// __ \_ __ \ /
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| Y Y \ | / | / __ \| | \/\___ \\ ___/| | \/ \
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|__|_| /____/|____| (____ /__| /____ >\___ >__| /___/\ \
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\/ \/ \/ \/ \_/
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Copyright (C) 2016, Ingo Berg
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "mpOprtIndex.h"
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#include "mpVariable.h"
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MUP_NAMESPACE_START
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//-----------------------------------------------------------------------------------------------
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//
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// class OprtIndex
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//
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//-----------------------------------------------------------------------------------------------
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OprtIndex::OprtIndex()
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:ICallback(cmIC, _T("Index operator"), -1)
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{}
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//-----------------------------------------------------------------------------------------------
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/** \brief Index operator implementation
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\param ret A reference to the return value
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\param a_pArg Pointer to an array with the indices as ptr_val_type
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\param a_iArgc Number of indices (=dimension) actully used in the expression found. This must
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be 1 or 2 since three dimensional data structures are not supported by muParserX.
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*/
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void OprtIndex::Eval(ptr_val_type &ret, const ptr_val_type *a_pArg, int a_iArgc)
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{
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try
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{
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int rows = a_pArg[-1]->GetRows();
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int cols = a_pArg[-1]->GetCols();
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bool bArgIsVariable = a_pArg[-1]->IsVariable();
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// If the index operator is applied to a variable the return value is also a variable
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// pointing to a specific cell in the matrix. If the operator is applied to a value
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// the return value is also a value.
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switch (a_iArgc)
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{
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case 1:
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if (cols == 1)
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{
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if (bArgIsVariable)
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ret.Reset(new Variable(&(ret->At(*a_pArg[0], Value(0.0)))));
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else
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*ret = ret->At(*a_pArg[0], Value(0.0));
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}
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else if (rows == 1)
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{
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if (bArgIsVariable)
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ret.Reset(new Variable(&(ret->At(Value(0.0), *a_pArg[0]))));
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else
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*ret = ret->At(Value(0.0), *a_pArg[0]);
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}
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else
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{
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throw ParserError(ErrorContext(ecINDEX_DIMENSION, -1, GetIdent()));
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}
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break;
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case 2:
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if (bArgIsVariable)
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ret.Reset(new Variable(&(ret->At(*a_pArg[0], *a_pArg[1]))));
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else
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*ret = ret->At(*a_pArg[0], *a_pArg[1]);
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break;
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default:
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throw ParserError(ErrorContext(ecINDEX_DIMENSION, -1, GetIdent()));
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}
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}
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catch(ParserError &exc)
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{
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exc.GetContext().Pos = GetExprPos();
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throw exc;
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}
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}
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//-----------------------------------------------------------------------------------------------
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const char_type* OprtIndex::GetDesc() const
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{
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return _T("[,] - The index operator.");
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}
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//-----------------------------------------------------------------------------------------------
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IToken* OprtIndex::Clone() const
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{
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return new OprtIndex(*this);
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}
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MUP_NAMESPACE_END
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