Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1164 insertions, 0 deletions

diff --git a/svx/source/customshapes/EnhancedCustomShapeFunctionParser.cxx b/svx/source/customshapes/EnhancedCustomShapeFunctionParser.cxx
new file mode 100644
index 000000000..f7aa223f4
--- /dev/null
+++ b/svx/source/customshapes/EnhancedCustomShapeFunctionParser.cxx
@@ -0,0 +1,1164 @@
+/* -*- 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 <sal/config.h>
+
+#include <svx/EnhancedCustomShape2d.hxx>
+#include <rtl/ustring.hxx>
+#include <sal/log.hxx>
+#include <tools/fract.hxx>
+
+#include <com/sun/star/drawing/EnhancedCustomShapeParameterType.hpp>
+
+// Makes parser a static resource,
+// we're synchronized externally.
+// But watch out, the parser might have
+// state not visible to this code!
+
+#define BOOST_SPIRIT_SINGLE_GRAMMAR_INSTANCE
+
+#if OSL_DEBUG_LEVEL >= 2 && defined(DBG_UTIL)
+#define BOOST_SPIRIT_DEBUG
+#endif
+#include <boost/spirit/include/classic_core.hpp>
+
+#include <functional>
+#include <algorithm>
+#include <stack>
+
+#include <math.h>
+using namespace EnhancedCustomShape;
+using namespace com::sun::star;
+using namespace com::sun::star::drawing;
+
+void EnhancedCustomShape::FillEquationParameter( const EnhancedCustomShapeParameter& rSource, const sal_Int32 nDestPara, EnhancedCustomShapeEquation& rDest )
+{
+    sal_Int32 nValue = 0;
+    if ( rSource.Value.getValueTypeClass() == uno::TypeClass_DOUBLE )
+    {
+        double fValue(0.0);
+        if ( rSource.Value >>= fValue )
+            nValue = static_cast<sal_Int32>(fValue);
+    }
+    else
+        rSource.Value >>= nValue;
+
+    switch( rSource.Type )
+    {
+        case css::drawing::EnhancedCustomShapeParameterType::EQUATION :
+        {
+            if ( nValue & 0x40000000 )
+            {
+                nValue ^= 0x40000000;
+                rDest.nOperation |= 0x20000000 << nDestPara;    // the bit is indicating that this value has to be adjusted later
+            }
+            nValue |= 0x400;
+        }
+        break;
+        case css::drawing::EnhancedCustomShapeParameterType::ADJUSTMENT : nValue += DFF_Prop_adjustValue; break;
+        case css::drawing::EnhancedCustomShapeParameterType::BOTTOM : nValue = DFF_Prop_geoBottom; break;
+        case css::drawing::EnhancedCustomShapeParameterType::RIGHT : nValue = DFF_Prop_geoRight; break;
+        case css::drawing::EnhancedCustomShapeParameterType::TOP : nValue = DFF_Prop_geoTop; break;
+        case css::drawing::EnhancedCustomShapeParameterType::LEFT : nValue = DFF_Prop_geoLeft; break;
+    }
+    if ( rSource.Type != css::drawing::EnhancedCustomShapeParameterType::NORMAL )
+        rDest.nOperation |= ( 0x2000 << nDestPara );
+    rDest.nPara[ nDestPara ] = nValue;
+}
+
+ExpressionNode::~ExpressionNode()
+{}
+
+namespace
+{
+
+
+// EXPRESSION NODES
+
+
+class ConstantValueExpression : public ExpressionNode
+{
+    double  maValue;
+
+public:
+
+    explicit ConstantValueExpression( double rValue ) :
+        maValue( rValue )
+    {
+    }
+    virtual double operator()() const override
+    {
+        return maValue;
+    }
+    virtual bool isConstant() const override
+    {
+        return true;
+    }
+    virtual ExpressionFunct getType() const override
+    {
+        return ExpressionFunct::Const;
+    }
+    virtual EnhancedCustomShapeParameter fillNode( std::vector< EnhancedCustomShapeEquation >& rEquations, ExpressionNode* /* pOptionalArg */, sal_uInt32 /* nFlags */ ) override
+    {
+        EnhancedCustomShapeParameter aRet;
+        Fraction aFract( maValue );
+        if ( aFract.GetDenominator() == 1 )
+        {
+            aRet.Type = EnhancedCustomShapeParameterType::NORMAL;
+            aRet.Value <<= aFract.GetNumerator();
+        }
+        else
+        {
+            EnhancedCustomShapeEquation aEquation;
+            aEquation.nOperation = 1;
+            aEquation.nPara[ 0 ] = 1;
+            aEquation.nPara[ 1 ] = static_cast<sal_Int16>(aFract.GetNumerator());
+            aEquation.nPara[ 2 ] = static_cast<sal_Int16>(aFract.GetDenominator());
+            aRet.Type = EnhancedCustomShapeParameterType::EQUATION;
+            aRet.Value <<= static_cast<sal_Int32>(rEquations.size());
+            rEquations.push_back( aEquation );
+        }
+        return aRet;
+    }
+};
+
+class AdjustmentExpression : public ExpressionNode
+{
+    sal_Int32                       mnIndex;
+    const EnhancedCustomShape2d&    mrCustoShape;
+
+public:
+
+    AdjustmentExpression( const EnhancedCustomShape2d& rCustoShape, sal_Int32 nIndex )
+    : mnIndex       ( nIndex )
+    , mrCustoShape( rCustoShape )
+
+    {
+    }
+    virtual double operator()() const override
+    {
+        SAL_INFO(
+            "svx",
+            "$" << mnIndex << " --> "
+                << mrCustoShape.GetAdjustValueAsDouble(mnIndex) << " (angle: "
+                << 180.0*mrCustoShape.GetAdjustValueAsDouble(mnIndex)/10800000.0
+                << ")");
+        return mrCustoShape.GetAdjustValueAsDouble( mnIndex );
+    }
+    virtual bool isConstant() const override
+    {
+        return false;
+    }
+    virtual ExpressionFunct getType() const override
+    {
+        return ExpressionFunct::EnumAdjustment;
+    }
+    virtual EnhancedCustomShapeParameter fillNode( std::vector< EnhancedCustomShapeEquation >& /*rEquations*/, ExpressionNode* /*pOptionalArg*/, sal_uInt32 /*nFlags*/ ) override
+    {
+        EnhancedCustomShapeParameter aRet;
+        aRet.Type = EnhancedCustomShapeParameterType::ADJUSTMENT;
+        aRet.Value <<= mnIndex;
+        return aRet;
+    }
+};
+
+class EquationExpression : public ExpressionNode
+{
+    const sal_Int32                 mnIndex;
+    const EnhancedCustomShape2d&    mrCustoShape;
+    mutable bool                    mbGettingValueGuard;
+
+public:
+
+    EquationExpression( const EnhancedCustomShape2d& rCustoShape, sal_Int32 nIndex )
+        : mnIndex       ( nIndex )
+        , mrCustoShape( rCustoShape )
+        , mbGettingValueGuard(false)
+    {
+    }
+    virtual double operator()() const override
+    {
+        if (mbGettingValueGuard)
+            throw ParseError("Loop in Expression");
+        mbGettingValueGuard = true;
+        double fRet = mrCustoShape.GetEquationValueAsDouble(mnIndex);
+        mbGettingValueGuard = false;
+        return fRet;
+    }
+    virtual bool isConstant() const override
+    {
+        return false;
+    }
+    virtual ExpressionFunct getType() const override
+    {
+        return ExpressionFunct::EnumEquation;
+    }
+    virtual EnhancedCustomShapeParameter fillNode( std::vector< EnhancedCustomShapeEquation >& /*rEquations*/, ExpressionNode* /*pOptionalArg*/, sal_uInt32 /*nFlags*/ ) override
+    {
+        EnhancedCustomShapeParameter aRet;
+        aRet.Type = EnhancedCustomShapeParameterType::EQUATION;
+        aRet.Value <<= mnIndex | 0x40000000;                        // the bit is indicating that this equation needs to be adjusted later
+        return aRet;
+    }
+};
+
+class EnumValueExpression : public ExpressionNode
+{
+    const ExpressionFunct           meFunct;
+    const EnhancedCustomShape2d&    mrCustoShape;
+
+public:
+
+    EnumValueExpression( const EnhancedCustomShape2d& rCustoShape, const ExpressionFunct eFunct )
+        : meFunct       ( eFunct )
+        , mrCustoShape  ( rCustoShape )
+    {
+    }
+    virtual double operator()() const override
+    {
+        SAL_INFO("svx", meFunct << " --> " << mrCustoShape.GetEnumFunc(meFunct) << "(angle: " <<
+                 180.0 * mrCustoShape.GetEnumFunc(meFunct) / 10800000.0 << ")");
+
+        return mrCustoShape.GetEnumFunc( meFunct );
+    }
+    virtual bool isConstant() const override
+    {
+        return false;
+    }
+    virtual ExpressionFunct getType() const override
+    {
+        return meFunct;
+    }
+    virtual EnhancedCustomShapeParameter fillNode( std::vector< EnhancedCustomShapeEquation >& rEquations, ExpressionNode* /*pOptionalArg*/, sal_uInt32 nFlags ) override
+    {
+        EnhancedCustomShapeParameter aRet;
+
+        aRet.Value <<= sal_Int32(1);
+
+        switch( meFunct )
+        {
+            case ExpressionFunct::EnumWidth :  // TODO: do not use this as constant value
+            case ExpressionFunct::EnumHeight :
+            case ExpressionFunct::EnumLogWidth :
+            case ExpressionFunct::EnumLogHeight :
+            case ExpressionFunct::EnumPi :
+            {
+                ConstantValueExpression aConstantValue( mrCustoShape.GetEnumFunc( meFunct ) );
+                aRet = aConstantValue.fillNode( rEquations, nullptr, nFlags );
+            }
+            break;
+            case ExpressionFunct::EnumLeft :   aRet.Type = EnhancedCustomShapeParameterType::LEFT; break;
+            case ExpressionFunct::EnumTop :    aRet.Type = EnhancedCustomShapeParameterType::TOP; break;
+            case ExpressionFunct::EnumRight :  aRet.Type = EnhancedCustomShapeParameterType::RIGHT; break;
+            case ExpressionFunct::EnumBottom : aRet.Type = EnhancedCustomShapeParameterType::BOTTOM; break;
+
+            // not implemented so far
+            case ExpressionFunct::EnumXStretch :
+            case ExpressionFunct::EnumYStretch :
+            case ExpressionFunct::EnumHasStroke :
+            case ExpressionFunct::EnumHasFill : aRet.Type = EnhancedCustomShapeParameterType::NORMAL; break;
+
+            default:
+                break;
+        }
+        return aRet;
+    }
+};
+
+/** ExpressionNode implementation for unary
+    function over one ExpressionNode
+    */
+class UnaryFunctionExpression : public ExpressionNode
+{
+    const ExpressionFunct   meFunct;
+    std::shared_ptr<ExpressionNode> mpArg;
+
+public:
+    UnaryFunctionExpression( const ExpressionFunct eFunct, const std::shared_ptr<ExpressionNode>& rArg ) :
+        meFunct( eFunct ),
+        mpArg( rArg )
+    {
+    }
+    static double getValue( const ExpressionFunct eFunct, const std::shared_ptr<ExpressionNode>& rArg )
+    {
+        double fRet = 0;
+        switch( eFunct )
+        {
+            case ExpressionFunct::UnaryAbs : fRet = fabs( (*rArg)() ); break;
+            case ExpressionFunct::UnarySqrt: fRet = sqrt( (*rArg)() ); break;
+            case ExpressionFunct::UnarySin : fRet = sin( (*rArg)() );  break;
+            case ExpressionFunct::UnaryCos : fRet = cos( (*rArg)() );  break;
+            case ExpressionFunct::UnaryTan : fRet = tan( (*rArg)() );  break;
+            case ExpressionFunct::UnaryAtan: fRet = atan( (*rArg)() ); break;
+            case ExpressionFunct::UnaryNeg : fRet = ::std::negate<double>()( (*rArg)() ); break;
+            default:
+                break;
+        }
+        return fRet;
+    }
+    virtual double operator()() const override
+    {
+        return getValue( meFunct, mpArg );
+    }
+    virtual bool isConstant() const override
+    {
+        return mpArg->isConstant();
+    }
+    virtual ExpressionFunct getType() const override
+    {
+        return meFunct;
+    }
+    virtual EnhancedCustomShapeParameter fillNode( std::vector< EnhancedCustomShapeEquation >& rEquations, ExpressionNode* pOptionalArg, sal_uInt32 nFlags ) override
+    {
+        EnhancedCustomShapeParameter aRet;
+        switch( meFunct )
+        {
+            case ExpressionFunct::UnaryAbs :
+            {
+                EnhancedCustomShapeEquation aEquation;
+                aEquation.nOperation |= 3;
+                FillEquationParameter( mpArg->fillNode( rEquations, nullptr, nFlags ), 0, aEquation );
+                aRet.Type = EnhancedCustomShapeParameterType::EQUATION;
+                aRet.Value <<= static_cast<sal_Int32>(rEquations.size());
+                rEquations.push_back( aEquation );
+            }
+            break;
+            case ExpressionFunct::UnarySqrt:
+            {
+                EnhancedCustomShapeEquation aEquation;
+                aEquation.nOperation |= 13;
+                FillEquationParameter( mpArg->fillNode( rEquations, nullptr, nFlags ), 0, aEquation );
+                aRet.Type = EnhancedCustomShapeParameterType::EQUATION;
+                aRet.Value <<= static_cast<sal_Int32>(rEquations.size());
+                rEquations.push_back( aEquation );
+            }
+            break;
+            case ExpressionFunct::UnarySin :
+            {
+                EnhancedCustomShapeEquation aEquation;
+                aEquation.nOperation |= 9;
+                if ( pOptionalArg )
+                    FillEquationParameter( pOptionalArg->fillNode( rEquations, nullptr, nFlags ), 0, aEquation );
+                else
+                    aEquation.nPara[ 0 ] = 1;
+
+                EnhancedCustomShapeParameter aSource( mpArg->fillNode( rEquations, nullptr, nFlags | EXPRESSION_FLAG_SUMANGLE_MODE ) );
+                if ( aSource.Type == EnhancedCustomShapeParameterType::NORMAL )
+                {   // sumangle needed :-(
+                    EnhancedCustomShapeEquation _aEquation;
+                    _aEquation.nOperation |= 0xe;   // sumangle
+                    FillEquationParameter( aSource, 1, _aEquation );
+                    aSource.Type = EnhancedCustomShapeParameterType::EQUATION;
+                    aSource.Value <<= static_cast<sal_Int32>(rEquations.size());
+                    rEquations.push_back( _aEquation );
+                }
+                FillEquationParameter( aSource, 1, aEquation );
+                aRet.Type = EnhancedCustomShapeParameterType::EQUATION;
+                aRet.Value <<= static_cast<sal_Int32>(rEquations.size());
+                rEquations.push_back( aEquation );
+            }
+            break;
+            case ExpressionFunct::UnaryCos :
+            {
+                EnhancedCustomShapeEquation aEquation;
+                aEquation.nOperation |= 10;
+                if ( pOptionalArg )
+                    FillEquationParameter( pOptionalArg->fillNode( rEquations, nullptr, nFlags ), 0, aEquation );
+                else
+                    aEquation.nPara[ 0 ] = 1;
+
+                EnhancedCustomShapeParameter aSource( mpArg->fillNode( rEquations, nullptr, nFlags | EXPRESSION_FLAG_SUMANGLE_MODE ) );
+                if ( aSource.Type == EnhancedCustomShapeParameterType::NORMAL )
+                {   // sumangle needed :-(
+                    EnhancedCustomShapeEquation aTmpEquation;
+                    aTmpEquation.nOperation |= 0xe; // sumangle
+                    FillEquationParameter( aSource, 1, aTmpEquation );
+                    aSource.Type = EnhancedCustomShapeParameterType::EQUATION;
+                    aSource.Value <<= static_cast<sal_Int32>(rEquations.size());
+                    rEquations.push_back( aTmpEquation );
+                }
+                FillEquationParameter( aSource, 1, aEquation );
+                aRet.Type = EnhancedCustomShapeParameterType::EQUATION;
+                aRet.Value <<= static_cast<sal_Int32>(rEquations.size());
+                rEquations.push_back( aEquation );
+            }
+            break;
+            case ExpressionFunct::UnaryTan :
+            {
+                EnhancedCustomShapeEquation aEquation;
+                aEquation.nOperation |= 16;
+                if ( pOptionalArg )
+                    FillEquationParameter( pOptionalArg->fillNode( rEquations, nullptr, nFlags ), 0, aEquation );
+                else
+                    aEquation.nPara[ 0 ] = 1;
+
+                EnhancedCustomShapeParameter aSource( mpArg->fillNode( rEquations, nullptr, nFlags | EXPRESSION_FLAG_SUMANGLE_MODE ) );
+                if ( aSource.Type == EnhancedCustomShapeParameterType::NORMAL )
+                {   // sumangle needed :-(
+                    EnhancedCustomShapeEquation aTmpEquation;
+                    aTmpEquation.nOperation |= 0xe; // sumangle
+                    FillEquationParameter( aSource, 1, aTmpEquation );
+                    aSource.Type = EnhancedCustomShapeParameterType::EQUATION;
+                    aSource.Value <<= static_cast<sal_Int32>(rEquations.size());
+                    rEquations.push_back( aTmpEquation );
+                }
+                FillEquationParameter( aSource, 1, aEquation );
+                aRet.Type = EnhancedCustomShapeParameterType::EQUATION;
+                aRet.Value <<= static_cast<sal_Int32>(rEquations.size());
+                rEquations.push_back( aEquation );
+            }
+            break;
+            case ExpressionFunct::UnaryAtan:
+            {
+// TODO:
+                aRet.Type = EnhancedCustomShapeParameterType::NORMAL;
+            }
+            break;
+            case ExpressionFunct::UnaryNeg:
+            {
+                EnhancedCustomShapeEquation aEquation;
+                aEquation.nOperation |= 1;
+                aEquation.nPara[ 1 ] = -1;
+                aEquation.nPara[ 2 ] = 1;
+                FillEquationParameter( mpArg->fillNode( rEquations, nullptr, nFlags ), 0, aEquation );
+                aRet.Type = EnhancedCustomShapeParameterType::EQUATION;
+                aRet.Value <<= static_cast<sal_Int32>(rEquations.size());
+                rEquations.push_back( aEquation );
+            }
+            break;
+            default:
+                break;
+        }
+        return aRet;
+    }
+};
+
+/** ExpressionNode implementation for unary
+    function over two ExpressionNodes
+    */
+class BinaryFunctionExpression : public ExpressionNode
+{
+    const ExpressionFunct   meFunct;
+    std::shared_ptr<ExpressionNode> mpFirstArg;
+    std::shared_ptr<ExpressionNode> mpSecondArg;
+
+public:
+
+    BinaryFunctionExpression( const ExpressionFunct eFunct, const std::shared_ptr<ExpressionNode>& rFirstArg, const std::shared_ptr<ExpressionNode>& rSecondArg ) :
+        meFunct( eFunct ),
+        mpFirstArg( rFirstArg ),
+        mpSecondArg( rSecondArg )
+    {
+    }
+#if defined(__clang__) || (defined (__GNUC__) && __GNUC__ >= 8)
+    //GetEquationValueAsDouble calls isFinite on the result
+    __attribute__((no_sanitize("float-divide-by-zero")))
+#endif
+    static double getValue( const ExpressionFunct eFunct, const std::shared_ptr<ExpressionNode>& rFirstArg, const std::shared_ptr<ExpressionNode>& rSecondArg )
+    {
+        double fRet = 0;
+        switch( eFunct )
+        {
+            case ExpressionFunct::BinaryPlus : fRet = (*rFirstArg)() + (*rSecondArg)(); break;
+            case ExpressionFunct::BinaryMinus: fRet = (*rFirstArg)() - (*rSecondArg)(); break;
+            case ExpressionFunct::BinaryMul :  fRet = (*rFirstArg)() * (*rSecondArg)(); break;
+            case ExpressionFunct::BinaryDiv :  fRet = (*rFirstArg)() / (*rSecondArg)(); break;
+            case ExpressionFunct::BinaryMin :  fRet = ::std::min( (*rFirstArg)(), (*rSecondArg)() ); break;
+            case ExpressionFunct::BinaryMax :  fRet = ::std::max( (*rFirstArg)(), (*rSecondArg)() ); break;
+            case ExpressionFunct::BinaryAtan2: fRet = atan2( (*rFirstArg)(), (*rSecondArg)() ); break;
+            default:
+                break;
+        }
+        return fRet;
+    }
+    virtual double operator()() const override
+    {
+        return getValue( meFunct, mpFirstArg, mpSecondArg );
+    }
+    virtual bool isConstant() const override
+    {
+        return mpFirstArg->isConstant() && mpSecondArg->isConstant();
+    }
+    virtual ExpressionFunct getType() const override
+    {
+        return meFunct;
+    }
+    virtual EnhancedCustomShapeParameter fillNode( std::vector< EnhancedCustomShapeEquation >& rEquations, ExpressionNode* /*pOptionalArg*/, sal_uInt32 nFlags ) override
+    {
+        EnhancedCustomShapeParameter aRet;
+        switch( meFunct )
+        {
+            case ExpressionFunct::BinaryPlus :
+            {
+                if ( nFlags & EXPRESSION_FLAG_SUMANGLE_MODE )
+                {
+                    if ( mpFirstArg->getType() == ExpressionFunct::EnumAdjustment )
+                    {
+                        EnhancedCustomShapeEquation aEquation;
+                        aEquation.nOperation |= 0xe;    // sumangle
+                        FillEquationParameter( mpFirstArg->fillNode( rEquations, nullptr, nFlags ), 0, aEquation );
+                        FillEquationParameter( mpSecondArg->fillNode( rEquations, nullptr, nFlags ), 1, aEquation );
+                        aRet.Type = EnhancedCustomShapeParameterType::EQUATION;
+                        aRet.Value <<= static_cast<sal_Int32>(rEquations.size());
+                        rEquations.push_back( aEquation );
+                    }
+                    else if ( mpSecondArg->getType() == ExpressionFunct::EnumAdjustment )
+                    {
+                        EnhancedCustomShapeEquation aEquation;
+                        aEquation.nOperation |= 0xe;    // sumangle
+                        FillEquationParameter( mpSecondArg->fillNode( rEquations, nullptr, nFlags ), 0, aEquation );
+                        FillEquationParameter( mpFirstArg->fillNode( rEquations, nullptr, nFlags ), 1, aEquation );
+                        aRet.Type = EnhancedCustomShapeParameterType::EQUATION;
+                        aRet.Value <<= static_cast<sal_Int32>(rEquations.size());
+                        rEquations.push_back( aEquation );
+                    }
+                    else
+                    {
+                        EnhancedCustomShapeEquation aSumangle1;
+                        aSumangle1.nOperation |= 0xe;   // sumangle
+                        FillEquationParameter( mpFirstArg->fillNode( rEquations, nullptr, nFlags &~EXPRESSION_FLAG_SUMANGLE_MODE ), 1, aSumangle1 );
+                        aRet.Type = EnhancedCustomShapeParameterType::EQUATION;
+                        aRet.Value <<= static_cast<sal_Int32>(rEquations.size());
+                        rEquations.push_back( aSumangle1 );
+
+                        EnhancedCustomShapeEquation aSumangle2;
+                        aSumangle2.nOperation |= 0xe;   // sumangle
+                        FillEquationParameter( mpSecondArg->fillNode( rEquations, nullptr, nFlags &~EXPRESSION_FLAG_SUMANGLE_MODE ), 1, aSumangle2 );
+                        aRet.Type = EnhancedCustomShapeParameterType::EQUATION;
+                        aRet.Value <<= static_cast<sal_Int32>(rEquations.size());
+                        rEquations.push_back( aSumangle2 );
+
+                        EnhancedCustomShapeEquation aEquation;
+                        aEquation.nOperation |= 0;
+                        aEquation.nPara[ 0 ] = ( rEquations.size() - 2 ) | 0x400;
+                        aEquation.nPara[ 1 ] = ( rEquations.size() - 1 ) | 0x400;
+                        aRet.Type = EnhancedCustomShapeParameterType::EQUATION;
+                        aRet.Value <<= static_cast<sal_Int32>(rEquations.size());
+                        rEquations.push_back( aEquation );
+                    }
+                }
+                else
+                {
+                    bool bFirstIsEmpty = mpFirstArg->isConstant() && ( (*mpFirstArg)() == 0 );
+                    bool bSecondIsEmpty = mpSecondArg->isConstant() && ( (*mpSecondArg)() == 0 );
+
+                    if ( bFirstIsEmpty )
+                        aRet = mpSecondArg->fillNode( rEquations, nullptr, nFlags );
+                    else if ( bSecondIsEmpty )
+                        aRet = mpFirstArg->fillNode( rEquations, nullptr, nFlags );
+                    else
+                    {
+                        EnhancedCustomShapeEquation aEquation;
+                        aEquation.nOperation |= 0;
+                        FillEquationParameter( mpFirstArg->fillNode( rEquations, nullptr, nFlags ), 0, aEquation );
+                        FillEquationParameter( mpSecondArg->fillNode( rEquations, nullptr, nFlags ), 1, aEquation );
+                        aRet.Type = EnhancedCustomShapeParameterType::EQUATION;
+                        aRet.Value <<= static_cast<sal_Int32>(rEquations.size());
+                        rEquations.push_back( aEquation );
+                    }
+                }
+            }
+            break;
+            case ExpressionFunct::BinaryMinus:
+            {
+                EnhancedCustomShapeEquation aEquation;
+                aEquation.nOperation |= 0;
+                FillEquationParameter( mpFirstArg->fillNode( rEquations, nullptr, nFlags ), 0, aEquation );
+                FillEquationParameter( mpSecondArg->fillNode( rEquations, nullptr, nFlags ), 2, aEquation );
+                aRet.Type = EnhancedCustomShapeParameterType::EQUATION;
+                aRet.Value <<= static_cast<sal_Int32>(rEquations.size());
+                rEquations.push_back( aEquation );
+            }
+            break;
+            case ExpressionFunct::BinaryMul :
+            {
+                // in the dest. format the cos function is using integer as result :-(
+                // so we can't use the generic algorithm
+                if ( ( mpFirstArg->getType() == ExpressionFunct::UnarySin ) || ( mpFirstArg->getType() == ExpressionFunct::UnaryCos ) || ( mpFirstArg->getType() == ExpressionFunct::UnaryTan ) )
+                    aRet = mpFirstArg->fillNode( rEquations, mpSecondArg.get(), nFlags );
+                else if ( ( mpSecondArg->getType() == ExpressionFunct::UnarySin ) || ( mpSecondArg->getType() == ExpressionFunct::UnaryCos ) || ( mpSecondArg->getType() == ExpressionFunct::UnaryTan ) )
+                    aRet = mpSecondArg->fillNode( rEquations, mpFirstArg.get(), nFlags );
+                else
+                {
+                    if ( mpFirstArg->isConstant() && (*mpFirstArg)() == 1 )
+                        aRet = mpSecondArg->fillNode( rEquations, nullptr, nFlags );
+                    else if ( mpSecondArg->isConstant() && (*mpSecondArg)() == 1 )
+                        aRet = mpFirstArg->fillNode( rEquations, nullptr, nFlags );
+                    else if ( ( mpFirstArg->getType() == ExpressionFunct::BinaryDiv )      // don't care of (pi/180)
+                        && ( static_cast<BinaryFunctionExpression*>(mpFirstArg.get())->mpFirstArg->getType() == ExpressionFunct::EnumPi )
+                        && ( static_cast<BinaryFunctionExpression*>(mpFirstArg.get())->mpSecondArg->getType() == ExpressionFunct::Const ) )
+                    {
+                        aRet = mpSecondArg->fillNode( rEquations, nullptr, nFlags );
+                    }
+                    else if ( ( mpSecondArg->getType() == ExpressionFunct::BinaryDiv )     // don't care of (pi/180)
+                        && ( static_cast<BinaryFunctionExpression*>(mpSecondArg.get())->mpFirstArg->getType() == ExpressionFunct::EnumPi )
+                        && ( static_cast<BinaryFunctionExpression*>(mpSecondArg.get())->mpSecondArg->getType() == ExpressionFunct::Const ) )
+                    {
+                        aRet = mpFirstArg->fillNode( rEquations, nullptr, nFlags );
+                    }
+                    else
+                    {
+                        EnhancedCustomShapeEquation aEquation;
+                        aEquation.nOperation |= 1;
+                        FillEquationParameter( mpFirstArg->fillNode( rEquations, nullptr, nFlags ), 0, aEquation );
+                        FillEquationParameter( mpSecondArg->fillNode( rEquations, nullptr, nFlags ), 1, aEquation );
+                        aEquation.nPara[ 2 ] = 1;
+                        aRet.Type = EnhancedCustomShapeParameterType::EQUATION;
+                        aRet.Value <<= static_cast<sal_Int32>(rEquations.size());
+                        rEquations.push_back( aEquation );
+                    }
+                }
+            }
+            break;
+            case ExpressionFunct::BinaryDiv :
+            {
+                EnhancedCustomShapeEquation aEquation;
+                aEquation.nOperation |= 1;
+                FillEquationParameter( mpFirstArg->fillNode( rEquations, nullptr, nFlags ), 0, aEquation );
+                aEquation.nPara[ 1 ] = 1;
+                FillEquationParameter( mpSecondArg->fillNode( rEquations, nullptr, nFlags ), 2, aEquation );
+                aRet.Type = EnhancedCustomShapeParameterType::EQUATION;
+                aRet.Value <<= static_cast<sal_Int32>(rEquations.size());
+                rEquations.push_back( aEquation );
+            }
+            break;
+            case ExpressionFunct::BinaryMin :
+            {
+                EnhancedCustomShapeEquation aEquation;
+                aEquation.nOperation |= 4;
+                FillEquationParameter( mpFirstArg->fillNode( rEquations, nullptr, nFlags ), 0, aEquation );
+                FillEquationParameter( mpSecondArg->fillNode( rEquations, nullptr, nFlags ), 1, aEquation );
+                aRet.Type = EnhancedCustomShapeParameterType::EQUATION;
+                aRet.Value <<= static_cast<sal_Int32>(rEquations.size());
+                rEquations.push_back( aEquation );
+            }
+            break;
+            case ExpressionFunct::BinaryMax :
+            {
+                EnhancedCustomShapeEquation aEquation;
+                aEquation.nOperation |= 5;
+                FillEquationParameter( mpFirstArg->fillNode( rEquations, nullptr, nFlags ), 0, aEquation );
+                FillEquationParameter( mpSecondArg->fillNode( rEquations, nullptr, nFlags ), 1, aEquation );
+                aRet.Type = EnhancedCustomShapeParameterType::EQUATION;
+                aRet.Value <<= static_cast<sal_Int32>(rEquations.size());
+                rEquations.push_back( aEquation );
+            }
+            break;
+            case ExpressionFunct::BinaryAtan2:
+            {
+                EnhancedCustomShapeEquation aEquation;
+                aEquation.nOperation |= 8;
+                FillEquationParameter( mpSecondArg->fillNode( rEquations, nullptr, nFlags ), 0, aEquation );
+                FillEquationParameter( mpFirstArg->fillNode( rEquations, nullptr, nFlags ), 1, aEquation );
+                aRet.Type = EnhancedCustomShapeParameterType::EQUATION;
+                aRet.Value <<= static_cast<sal_Int32>(rEquations.size());
+                rEquations.push_back( aEquation );
+            }
+            break;
+            default:
+                break;
+        }
+        return aRet;
+    }
+};
+
+class IfExpression : public ExpressionNode
+{
+    std::shared_ptr<ExpressionNode> mpFirstArg;
+    std::shared_ptr<ExpressionNode> mpSecondArg;
+    std::shared_ptr<ExpressionNode> mpThirdArg;
+
+public:
+
+    IfExpression( const std::shared_ptr<ExpressionNode>& rFirstArg,
+                  const std::shared_ptr<ExpressionNode>& rSecondArg,
+                  const std::shared_ptr<ExpressionNode>& rThirdArg ) :
+        mpFirstArg(  rFirstArg ),
+        mpSecondArg( rSecondArg ),
+        mpThirdArg(  rThirdArg )
+    {
+    }
+    virtual bool isConstant() const override
+    {
+        return
+            mpFirstArg->isConstant() &&
+            mpSecondArg->isConstant() &&
+            mpThirdArg->isConstant();
+    }
+    virtual double operator()() const override
+    {
+        return (*mpFirstArg)() > 0 ? (*mpSecondArg)() : (*mpThirdArg)();
+    }
+    virtual ExpressionFunct getType() const override
+    {
+        return ExpressionFunct::TernaryIf;
+    }
+    virtual EnhancedCustomShapeParameter fillNode( std::vector< EnhancedCustomShapeEquation >& rEquations, ExpressionNode* /*pOptionalArg*/, sal_uInt32 nFlags ) override
+    {
+        EnhancedCustomShapeParameter aRet;
+        aRet.Type = EnhancedCustomShapeParameterType::EQUATION;
+        aRet.Value <<= static_cast<sal_Int32>(rEquations.size());
+        {
+            EnhancedCustomShapeEquation aEquation;
+            aEquation.nOperation |= 6;
+            FillEquationParameter( mpFirstArg->fillNode( rEquations, nullptr, nFlags ), 0, aEquation );
+            FillEquationParameter( mpSecondArg->fillNode( rEquations, nullptr, nFlags  ), 1, aEquation );
+            FillEquationParameter( mpThirdArg->fillNode( rEquations, nullptr, nFlags ), 2, aEquation );
+            rEquations.push_back( aEquation );
+        }
+        return aRet;
+    }
+};
+
+
+// FUNCTION PARSER
+
+
+typedef const char* StringIteratorT;
+
+struct ParserContext
+{
+    typedef ::std::stack< std::shared_ptr<ExpressionNode> > OperandStack;
+
+    // stores a stack of not-yet-evaluated operands. This is used
+    // by the operators (i.e. '+', '*', 'sin' etc.) to pop their
+    // arguments from. If all arguments to an operator are constant,
+    // the operator pushes a precalculated result on the stack, and
+    // a composite ExpressionNode otherwise.
+    OperandStack                maOperandStack;
+
+    const EnhancedCustomShape2d* mpCustoShape;
+
+};
+
+typedef std::shared_ptr< ParserContext > ParserContextSharedPtr;
+
+/** Generate parse-dependent-but-then-constant value
+    */
+class DoubleConstantFunctor
+{
+    ParserContextSharedPtr  mxContext;
+
+public:
+    explicit DoubleConstantFunctor( const ParserContextSharedPtr& rContext ) :
+        mxContext( rContext )
+    {
+    }
+    void operator()( double n ) const
+    {
+        mxContext->maOperandStack.push( std::make_shared<ConstantValueExpression>( n ) );
+    }
+};
+
+class EnumFunctor
+{
+    const ExpressionFunct           meFunct;
+    ParserContextSharedPtr          mxContext;
+
+public:
+
+    EnumFunctor( const ExpressionFunct eFunct, const ParserContextSharedPtr& rContext )
+    : meFunct( eFunct )
+    , mxContext( rContext )
+    {
+    }
+    void operator()( StringIteratorT rFirst, StringIteratorT rSecond ) const
+    {
+        /*double nVal = mnValue;*/
+        switch( meFunct )
+        {
+            case ExpressionFunct::EnumAdjustment :
+            {
+                OUString aVal( rFirst + 1, rSecond - rFirst, RTL_TEXTENCODING_UTF8 );
+                mxContext->maOperandStack.push( std::make_shared<AdjustmentExpression>( *mxContext->mpCustoShape, aVal.toInt32() ) );
+            }
+            break;
+            case ExpressionFunct::EnumEquation :
+                {
+                OUString aVal( rFirst + 1, rSecond - rFirst, RTL_TEXTENCODING_UTF8 );
+                mxContext->maOperandStack.push( std::make_shared<EquationExpression>( *mxContext->mpCustoShape, aVal.toInt32() ) );
+            }
+            break;
+            default:
+                mxContext->maOperandStack.push( std::make_shared<EnumValueExpression>( *mxContext->mpCustoShape, meFunct ) );
+        }
+    }
+};
+
+class UnaryFunctionFunctor
+{
+    const ExpressionFunct   meFunct;
+    ParserContextSharedPtr  mxContext;
+
+public:
+
+    UnaryFunctionFunctor( const ExpressionFunct eFunct, const ParserContextSharedPtr& rContext ) :
+        meFunct( eFunct ),
+        mxContext( rContext )
+    {
+    }
+    void operator()( StringIteratorT, StringIteratorT ) const
+    {
+        ParserContext::OperandStack& rNodeStack( mxContext->maOperandStack );
+
+        if( rNodeStack.empty() )
+            throw ParseError( "Not enough arguments for unary operator" );
+
+        // retrieve arguments
+        std::shared_ptr<ExpressionNode> pArg( std::move(rNodeStack.top()) );
+        rNodeStack.pop();
+
+        if( pArg->isConstant() )    // check for constness
+            rNodeStack.push( std::make_shared<ConstantValueExpression>( UnaryFunctionExpression::getValue( meFunct, pArg ) ) );
+        else                        // push complex node, that calcs the value on demand
+            rNodeStack.push( std::make_shared<UnaryFunctionExpression>( meFunct, pArg ) );
+    }
+};
+
+/** Implements a binary function over two ExpressionNodes
+
+    @tpl Generator
+    Generator functor, to generate an ExpressionNode of
+    appropriate type
+
+    */
+class BinaryFunctionFunctor
+{
+    const ExpressionFunct   meFunct;
+    ParserContextSharedPtr  mxContext;
+
+public:
+
+    BinaryFunctionFunctor( const ExpressionFunct eFunct, const ParserContextSharedPtr& rContext ) :
+        meFunct( eFunct ),
+        mxContext( rContext )
+    {
+    }
+
+    void operator()( StringIteratorT, StringIteratorT ) const
+    {
+        ParserContext::OperandStack& rNodeStack( mxContext->maOperandStack );
+
+        if( rNodeStack.size() < 2 )
+            throw ParseError( "Not enough arguments for binary operator" );
+
+        // retrieve arguments
+        std::shared_ptr<ExpressionNode> pSecondArg( std::move(rNodeStack.top()) );
+        rNodeStack.pop();
+        std::shared_ptr<ExpressionNode> pFirstArg( std::move(rNodeStack.top()) );
+        rNodeStack.pop();
+
+        assert(pSecondArg && pFirstArg && "count of arg checked before we get here");
+
+        // create combined ExpressionNode
+        auto pNode = std::make_shared<BinaryFunctionExpression>( meFunct, pFirstArg, pSecondArg );
+        // check for constness
+        if( pFirstArg->isConstant() && pSecondArg->isConstant() )   // call the operator() at pNode, store result in constant value ExpressionNode.
+            rNodeStack.push( std::make_shared<ConstantValueExpression>( (*pNode)() ) );
+        else                                                        // push complex node, that calcs the value on demand
+            rNodeStack.push( pNode );
+    }
+};
+
+class IfFunctor
+{
+    ParserContextSharedPtr  mxContext;
+
+public:
+
+    explicit IfFunctor( const ParserContextSharedPtr& rContext ) :
+        mxContext( rContext )
+    {
+    }
+    void operator()( StringIteratorT, StringIteratorT ) const
+    {
+        ParserContext::OperandStack& rNodeStack( mxContext->maOperandStack );
+
+        if( rNodeStack.size() < 3 )
+            throw ParseError( "Not enough arguments for ternary operator" );
+
+        // retrieve arguments
+        std::shared_ptr<ExpressionNode> pThirdArg( std::move(rNodeStack.top()) );
+        rNodeStack.pop();
+        std::shared_ptr<ExpressionNode> pSecondArg( std::move(rNodeStack.top()) );
+        rNodeStack.pop();
+        std::shared_ptr<ExpressionNode> pFirstArg( std::move(rNodeStack.top()) );
+        rNodeStack.pop();
+
+        assert(pThirdArg && pSecondArg && pFirstArg);
+
+        // create combined ExpressionNode
+        auto pNode = std::make_shared<IfExpression>( pFirstArg, pSecondArg, pThirdArg );
+        // check for constness
+        if( pFirstArg->isConstant() && pSecondArg->isConstant() && pThirdArg->isConstant() )
+            rNodeStack.push( std::make_shared<ConstantValueExpression>( (*pNode)() ) );    // call the operator() at pNode, store result in constant value ExpressionNode.
+        else
+            rNodeStack.push( pNode );                                       // push complex node, that calcs the value on demand
+    }
+};
+
+// Workaround for MSVC compiler anomaly (stack trashing)
+
+// The default ureal_parser_policies implementation of parse_exp
+// triggers a really weird error in MSVC7 (Version 13.00.9466), in
+// that the real_parser_impl::parse_main() call of parse_exp()
+// overwrites the frame pointer _on the stack_ (EBP of the calling
+// function gets overwritten while lying on the stack).
+
+// For the time being, our parser thus can only read the 1.0E10
+// notation, not the 1.0e10 one.
+
+// TODO(F1): Also handle the 1.0e10 case here.
+template< typename T > struct custom_real_parser_policies : public ::boost::spirit::classic::ureal_parser_policies<T>
+{
+    template< typename ScannerT >
+        static typename ::boost::spirit::classic::parser_result< ::boost::spirit::classic::chlit<>, ScannerT >::type
+    parse_exp(ScannerT& scan)
+    {
+        // as_lower_d somehow breaks MSVC7
+        return ::boost::spirit::classic::ch_p('E').parse(scan);
+    }
+};
+
+/* This class implements the following grammar (more or
+    less literally written down below, only slightly
+    obfuscated by the parser actions):
+
+    identifier = '$'|'pi'|'e'|'X'|'Y'|'Width'|'Height'
+
+    function = 'abs'|'sqrt'|'sin'|'cos'|'tan'|'atan'|'acos'|'asin'|'exp'|'log'
+
+    basic_expression =
+                       number |
+                       identifier |
+                       function '(' additive_expression ')' |
+                       '(' additive_expression ')'
+
+    unary_expression =
+                       '-' basic_expression |
+                    basic_expression
+
+    multiplicative_expression =
+                       unary_expression ( ( '*' unary_expression )* |
+                                        ( '/' unary_expression )* )
+
+    additive_expression =
+                       multiplicative_expression ( ( '+' multiplicative_expression )* |
+                                                   ( '-' multiplicative_expression )* )
+
+    */
+
+class ExpressionGrammar : public ::boost::spirit::classic::grammar< ExpressionGrammar >
+{
+public:
+    /** Create an arithmetic expression grammar
+
+        @param rParserContext
+        Contains context info for the parser
+        */
+    explicit ExpressionGrammar( const ParserContextSharedPtr& rParserContext ) :
+        mpParserContext( rParserContext )
+    {
+    }
+
+    template< typename ScannerT > class definition
+    {
+    public:
+        // grammar definition
+        explicit definition( const ExpressionGrammar& self )
+        {
+            using ::boost::spirit::classic::str_p;
+            using ::boost::spirit::classic::range_p;
+            using ::boost::spirit::classic::lexeme_d;
+            using ::boost::spirit::classic::real_parser;
+
+            identifier =
+                            str_p( "pi"         )[ EnumFunctor(ExpressionFunct::EnumPi,        self.getContext() ) ]
+                    |       str_p( "left"       )[ EnumFunctor(ExpressionFunct::EnumLeft,      self.getContext() ) ]
+                    |       str_p( "top"        )[ EnumFunctor(ExpressionFunct::EnumTop,       self.getContext() ) ]
+                    |       str_p( "right"      )[ EnumFunctor(ExpressionFunct::EnumRight,     self.getContext() ) ]
+                    |       str_p( "bottom"     )[ EnumFunctor(ExpressionFunct::EnumBottom,    self.getContext() ) ]
+                    |       str_p( "xstretch"   )[ EnumFunctor(ExpressionFunct::EnumXStretch,  self.getContext() ) ]
+                    |       str_p( "ystretch"   )[ EnumFunctor(ExpressionFunct::EnumYStretch,  self.getContext() ) ]
+                    |       str_p( "hasstroke"  )[ EnumFunctor(ExpressionFunct::EnumHasStroke, self.getContext() ) ]
+                    |       str_p( "hasfill"    )[ EnumFunctor(ExpressionFunct::EnumHasFill,   self.getContext() ) ]
+                    |       str_p( "width"      )[ EnumFunctor(ExpressionFunct::EnumWidth,     self.getContext() ) ]
+                    |       str_p( "height"     )[ EnumFunctor(ExpressionFunct::EnumHeight,    self.getContext() ) ]
+                    |       str_p( "logwidth"   )[ EnumFunctor(ExpressionFunct::EnumLogWidth,  self.getContext() ) ]
+                    |       str_p( "logheight"  )[ EnumFunctor(ExpressionFunct::EnumLogHeight, self.getContext() ) ]
+                    ;
+
+            unaryFunction =
+                    (str_p( "abs"  ) >> '(' >> additiveExpression >> ')' )[ UnaryFunctionFunctor( ExpressionFunct::UnaryAbs,  self.getContext()) ]
+                |   (str_p( "sqrt" ) >> '(' >> additiveExpression >> ')' )[ UnaryFunctionFunctor( ExpressionFunct::UnarySqrt, self.getContext()) ]
+                |   (str_p( "sin"  ) >> '(' >> additiveExpression >> ')' )[ UnaryFunctionFunctor( ExpressionFunct::UnarySin,  self.getContext()) ]
+                |   (str_p( "cos"  ) >> '(' >> additiveExpression >> ')' )[ UnaryFunctionFunctor( ExpressionFunct::UnaryCos,  self.getContext()) ]
+                |   (str_p( "tan"  ) >> '(' >> additiveExpression >> ')' )[ UnaryFunctionFunctor( ExpressionFunct::UnaryTan,  self.getContext()) ]
+                |   (str_p( "atan" ) >> '(' >> additiveExpression >> ')' )[ UnaryFunctionFunctor( ExpressionFunct::UnaryAtan, self.getContext()) ]
+                ;
+
+            binaryFunction =
+                    (str_p( "min"  ) >> '(' >> additiveExpression >> ',' >> additiveExpression >> ')' )[ BinaryFunctionFunctor( ExpressionFunct::BinaryMin,  self.getContext()) ]
+                |   (str_p( "max"  ) >> '(' >> additiveExpression >> ',' >> additiveExpression >> ')' )[ BinaryFunctionFunctor( ExpressionFunct::BinaryMax,  self.getContext()) ]
+                |   (str_p( "atan2") >> '(' >> additiveExpression >> ',' >> additiveExpression >> ')' )[ BinaryFunctionFunctor( ExpressionFunct::BinaryAtan2,self.getContext()) ]
+                ;
+
+            ternaryFunction =
+                    (str_p( "if"  ) >> '(' >> additiveExpression >> ',' >> additiveExpression >> ',' >> additiveExpression >> ')' )[ IfFunctor( self.getContext() ) ]
+                ;
+
+            funcRef_decl =
+                lexeme_d[ +( range_p('a','z') | range_p('A','Z') | range_p('0','9') ) ];
+
+            functionReference =
+                (str_p( "?" ) >> funcRef_decl )[ EnumFunctor( ExpressionFunct::EnumEquation, self.getContext() ) ];
+
+            modRef_decl =
+                lexeme_d[ +( range_p('0','9') ) ];
+
+            modifierReference =
+                (str_p( "$" ) >> modRef_decl )[ EnumFunctor( ExpressionFunct::EnumAdjustment, self.getContext() ) ];
+
+            basicExpression =
+                    real_parser<double, custom_real_parser_policies<double> >()[ DoubleConstantFunctor(self.getContext()) ]
+                |   identifier
+                |   functionReference
+                |   modifierReference
+                |   unaryFunction
+                |   binaryFunction
+                |   ternaryFunction
+                |   '(' >> additiveExpression >> ')'
+                ;
+
+            unaryExpression =
+                    ('-' >> basicExpression)[ UnaryFunctionFunctor( ExpressionFunct::UnaryNeg, self.getContext()) ]
+                |   basicExpression
+                ;
+
+            multiplicativeExpression =
+                    unaryExpression
+                >> *( ('*' >> unaryExpression)[ BinaryFunctionFunctor( ExpressionFunct::BinaryMul, self.getContext()) ]
+                    | ('/' >> unaryExpression)[ BinaryFunctionFunctor( ExpressionFunct::BinaryDiv, self.getContext()) ]
+                    )
+                ;
+
+            additiveExpression =
+                    multiplicativeExpression
+                >> *( ('+' >> multiplicativeExpression)[ BinaryFunctionFunctor( ExpressionFunct::BinaryPlus,  self.getContext()) ]
+                    | ('-' >> multiplicativeExpression)[ BinaryFunctionFunctor( ExpressionFunct::BinaryMinus, self.getContext()) ]
+                    )
+                ;
+
+            BOOST_SPIRIT_DEBUG_RULE(additiveExpression);
+            BOOST_SPIRIT_DEBUG_RULE(multiplicativeExpression);
+            BOOST_SPIRIT_DEBUG_RULE(unaryExpression);
+            BOOST_SPIRIT_DEBUG_RULE(basicExpression);
+            BOOST_SPIRIT_DEBUG_RULE(unaryFunction);
+            BOOST_SPIRIT_DEBUG_RULE(binaryFunction);
+            BOOST_SPIRIT_DEBUG_RULE(ternaryFunction);
+            BOOST_SPIRIT_DEBUG_RULE(identifier);
+        }
+
+        const ::boost::spirit::classic::rule< ScannerT >& start() const
+        {
+            return additiveExpression;
+        }
+
+    private:
+        // the constituents of the Spirit arithmetic expression grammar.
+        // For the sake of readability, without 'ma' prefix.
+        ::boost::spirit::classic::rule< ScannerT >   additiveExpression;
+        ::boost::spirit::classic::rule< ScannerT >   multiplicativeExpression;
+        ::boost::spirit::classic::rule< ScannerT >   unaryExpression;
+        ::boost::spirit::classic::rule< ScannerT >   basicExpression;
+        ::boost::spirit::classic::rule< ScannerT >   unaryFunction;
+        ::boost::spirit::classic::rule< ScannerT >   binaryFunction;
+        ::boost::spirit::classic::rule< ScannerT >   ternaryFunction;
+        ::boost::spirit::classic::rule< ScannerT >   funcRef_decl;
+        ::boost::spirit::classic::rule< ScannerT >   functionReference;
+        ::boost::spirit::classic::rule< ScannerT >   modRef_decl;
+        ::boost::spirit::classic::rule< ScannerT >   modifierReference;
+        ::boost::spirit::classic::rule< ScannerT >   identifier;
+    };
+
+    const ParserContextSharedPtr& getContext() const
+    {
+        return mpParserContext;
+    }
+
+private:
+    ParserContextSharedPtr          mpParserContext; // might get modified during parsing
+};
+
+const ParserContextSharedPtr& getParserContext()
+{
+    static ParserContextSharedPtr lcl_parserContext = std::make_shared<ParserContext>();
+
+    // clear node stack (since we reuse the static object, that's
+    // the whole point here)
+    while( !lcl_parserContext->maOperandStack.empty() )
+        lcl_parserContext->maOperandStack.pop();
+
+    return lcl_parserContext;
+}
+
+}
+
+namespace EnhancedCustomShape  {
+
+
+std::shared_ptr<ExpressionNode> const & FunctionParser::parseFunction( std::u16string_view rFunction, const EnhancedCustomShape2d& rCustoShape )
+{
+    // TODO(Q1): Check if a combination of the RTL_UNICODETOTEXT_FLAGS_*
+    // gives better conversion robustness here (we might want to map space
+    // etc. to ASCII space here)
+    const OString& rAsciiFunction(
+        OUStringToOString( rFunction, RTL_TEXTENCODING_ASCII_US ) );
+
+    StringIteratorT aStart( rAsciiFunction.getStr() );
+    StringIteratorT aEnd( rAsciiFunction.getStr()+rAsciiFunction.getLength() );
+
+    // static parser context, because the actual
+    // Spirit parser is also a static object
+    ParserContextSharedPtr pContext = getParserContext();
+    pContext->mpCustoShape = &rCustoShape;
+
+    ExpressionGrammar aExpressionGrammer( pContext );
+    const ::boost::spirit::classic::parse_info<StringIteratorT> aParseInfo(
+            ::boost::spirit::classic::parse( aStart,
+                                    aEnd,
+                                    aExpressionGrammer >> ::boost::spirit::classic::end_p,
+                                    ::boost::spirit::classic::space_p ) );
+
+    // input fully congested by the parser?
+    if( !aParseInfo.full )
+        throw ParseError( "EnhancedCustomShapeFunctionParser::parseFunction(): string not fully parseable" );
+
+    // parser's state stack now must contain exactly _one_ ExpressionNode,
+    // which represents our formula.
+    if( pContext->maOperandStack.size() != 1 )
+        throw ParseError( "EnhancedCustomShapeFunctionParser::parseFunction(): incomplete or empty expression" );
+
+
+    return pContext->maOperandStack.top();
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */