kicad/pcbnew/pcb_expr_evaluator.cpp

/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2019-2020 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */


#include <cstdio>
#include <boost/algorithm/string/case_conv.hpp>
#include "class_board.h"
#include "pcb_expr_evaluator.h"

class PCB_EXPR_BUILTIN_FUNCTIONS
{
public:

    using FPTR = LIBEVAL::UCODE::FUNC_PTR;

    PCB_EXPR_BUILTIN_FUNCTIONS();

    static PCB_EXPR_BUILTIN_FUNCTIONS& Instance()
    {
        static PCB_EXPR_BUILTIN_FUNCTIONS self;
        return self;
    }

    std::string tolower( const std::string& str ) const
    {
        std::string rv;
        std::transform( str.begin(), str.end(), rv.begin(), ::tolower );
        return rv;
    }

    FPTR Get( const std::string &name ) const
    {
        auto it = m_funcs.find( name );

        if( it == m_funcs.end() )
            return nullptr;

        return it->second;
    }

private:
    std::map<std::string, FPTR> m_funcs;

    static void onLayer( LIBEVAL::UCODE* aUcode, LIBEVAL::UCODE::CONTEXT* aCtx, void *self )
    {
        LIBEVAL::VALUE*   arg = aCtx->Pop();
        PCB_EXPR_VAR_REF* vref = static_cast<PCB_EXPR_VAR_REF*>( self );
        PCB_LAYER_ID      layer = ENUM_MAP<PCB_LAYER_ID>::Instance().ToEnum( arg->AsString() );
        BOARD_ITEM*       item = vref->GetObject( aUcode );
        LIBEVAL::VALUE*   rv = aCtx->AllocValue();

        rv->Set( item->IsOnLayer( layer ) ? 1.0 : 0.0 );
        aCtx->Push( rv );
    }

    static void isPlated( LIBEVAL::UCODE* aUcode, LIBEVAL::UCODE::CONTEXT* aCtx, void *self )
    {
        PCB_EXPR_VAR_REF* vref = static_cast<PCB_EXPR_VAR_REF*>( self );
        BOARD_ITEM*       item = vref->GetObject( aUcode );
        bool              result = false;

        if( item->Type() == PCB_PAD_T )
        {
            D_PAD* pad = static_cast<D_PAD*>( item );
            result = pad->GetAttribute() == PAD_ATTRIB_STANDARD;
        }

        LIBEVAL::VALUE* rv =  aCtx->AllocValue();
        rv->Set( result ? 1.0 : 0.0 );
        aCtx->Push( rv );
    }
};


PCB_EXPR_BUILTIN_FUNCTIONS::PCB_EXPR_BUILTIN_FUNCTIONS()
{
    m_funcs[ "onlayer" ] = onLayer;
    m_funcs[ "isplated" ] = isPlated;
}


BOARD_ITEM* PCB_EXPR_VAR_REF::GetObject( LIBEVAL::UCODE* aUcode ) const
{   
    const PCB_EXPR_UCODE* ucode = static_cast<const PCB_EXPR_UCODE*>( aUcode );
    BOARD_ITEM*           item  = ucode->GetItem( m_itemIndex );
    return item;
}


LIBEVAL::VALUE PCB_EXPR_VAR_REF::GetValue( LIBEVAL::UCODE* aUcode ) 
{
    BOARD_ITEM* item  = const_cast<BOARD_ITEM*>( GetObject( aUcode ) );
    auto        it = m_matchingTypes.find( TYPE_HASH( *item ) );

    if( it == m_matchingTypes.end() )
    {
        wxString msg;
        msg.Printf("property not found for item of type: 0x%x!\n",  TYPE_HASH( *item ) );
        aUcode->RuntimeError( (const char *) msg.c_str() );
        return LIBEVAL::VALUE( 0.0 );
    }
    else
    {
        if( m_type == LIBEVAL::VT_NUMERIC )
            return LIBEVAL::VALUE( (double) item->Get<int>( it->second ) );
        else
        {
            wxString str;
            if( !m_isEnum )
            {
                //printf("item %p Get string '%s'\n", item, (const char*) it->second->Name().c_str() );
                str = item->Get<wxString>( it->second );
            }
            else
            {
                const auto& any = item->Get( it->second );
                any.GetAs<wxString>( &str );
                //printf("item %p get enum: '%s'\n", item , (const char*) str.c_str() );
            }
            return LIBEVAL::VALUE( (const char*) str.c_str() );
        }
    }
}


LIBEVAL::UCODE::FUNC_PTR PCB_EXPR_UCODE::createFuncCall( LIBEVAL::COMPILER* aCompiler,
                                                         const std::string& name )
{
    PCB_EXPR_BUILTIN_FUNCTIONS& registry = PCB_EXPR_BUILTIN_FUNCTIONS::Instance();

    auto f = registry.Get( boost::to_lower_copy( name ) );

    return f;
}


LIBEVAL::VAR_REF* PCB_EXPR_UCODE::createVarRef( LIBEVAL::COMPILER *aCompiler,
                                                const std::string& var, const std::string& field )
{
    PROPERTY_MANAGER& propMgr = PROPERTY_MANAGER::Instance();
    PCB_EXPR_VAR_REF* vref = nullptr;

    if( var == "A" )
    {
        vref = new PCB_EXPR_VAR_REF( 0 );
    }
    else if( var == "B" )
    {
        vref = new PCB_EXPR_VAR_REF( 1 );
    }
    else
    {
        aCompiler->ReportError( "var" );
        return vref;
    }

    if( field.empty() ) // return reference to base object
        return vref;

    for( const PROPERTY_MANAGER::CLASS_INFO& cls : propMgr.GetAllClasses() )
    {
        if( propMgr.IsOfType( cls.type, TYPE_HASH( BOARD_ITEM ) ) )
        {
            PROPERTY_BASE* prop = propMgr.GetProperty( cls.type, field );
        
            if( prop )
            {
                //printf("Field '%s' class %s ptr %p haschoices %d typeid %s\n", field.c_str(), (const char *) cls.name.c_str(), prop, !!prop->HasChoices(), typeid(*prop).name() );
                vref->AddAllowedClass( cls.type, prop );

                if( prop->TypeHash() == TYPE_HASH( int ) )
                {
                    vref->SetType( LIBEVAL::VT_NUMERIC );
                }
                else if( prop->TypeHash() == TYPE_HASH( wxString ) )
                {
                    vref->SetType( LIBEVAL::VT_STRING );
                }
                else if ( prop->HasChoices() )
                {   // it's an enum, we treat it as string
                    vref->SetType( LIBEVAL::VT_STRING );
                    vref->SetIsEnum ( true );
                }
                else
                {
                    (void) 0; // should we do anything here?
                    //msg.Printf("Unrecognized type for property '%s'", field.c_str() );
                    //aCompiler->ReportError( (const char*) msg.c_str() );
                }
            }
        }
    }

    if( vref->GetType() == LIBEVAL::VT_UNDEFINED )
        aCompiler->ReportError( "field" );

    return vref;
}


class PCB_UNIT_RESOLVER : public LIBEVAL::UNIT_RESOLVER
{
public:
    virtual ~PCB_UNIT_RESOLVER()
    {
    }

    virtual const std::vector<std::string>& GetSupportedUnits() const override
    {
        static const std::vector<std::string> pcbUnits = { "mil", "mm", "in" };

        return pcbUnits;
    }

    virtual double Convert( const std::string& aString, int unitId ) const override
    {
        double v = atof( aString.c_str() );

        switch( unitId )
        {
        case 0:  return Mils2iu( v );
        case 1:  return Millimeter2iu( v );
        case 2:  return Mils2iu( v * 1000.0 );
        default: return v;
        }
    };
};


PCB_EXPR_COMPILER::PCB_EXPR_COMPILER()
{
    m_unitResolver.reset( new PCB_UNIT_RESOLVER );
}


PCB_EXPR_EVALUATOR::PCB_EXPR_EVALUATOR()
{
    m_error = false;
}

PCB_EXPR_EVALUATOR::~PCB_EXPR_EVALUATOR()
{
}


bool PCB_EXPR_EVALUATOR::Evaluate( const wxString& aExpr )
{
    PCB_EXPR_UCODE ucode;
    if( !m_compiler.Compile( (const char*) aExpr.c_str(), &ucode ) )
        return false;

    auto result = ucode.Run();

    if( result->GetType() == LIBEVAL::VT_NUMERIC )
        m_result = KiROUND( result->AsDouble() );

    return true;
}

wxString PCB_EXPR_EVALUATOR::GetErrorString()
{
    wxString errMsg;
    return errMsg;
}