sch_symbol.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2015 Jean-Pierre Charras, jp.charras at wanadoo.fr
 * Copyright The 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, see <https://www.gnu.org/licenses/>.
 */
 
#include <api/api_enums.h>
#include <api/api_utils.h>
#include <sch_collectors.h>
#include <sch_commit.h>
#include <sch_edit_frame.h>
#include <widgets/msgpanel.h>
#include <bitmaps.h>
#include <core/mirror.h>
#include "lib_symbol.h"
#include <sch_shape.h>
#include <pgm_base.h>
#include <sim/sim_model.h>
#include <sim/spice_generator.h>
#include <sim/sim_lib_mgr.h>
#include <trace_helpers.h>
#include <trigo.h>
#include <refdes_utils.h>
#include <wx/log.h>
#include <settings/settings_manager.h>
#include <sch_plotter.h>
#include <string_utils.h>
#include <geometry/geometry_utils.h>
#include <sch_rule_area.h>
#include <api/api_sch_utils.h>
#include <api/schematic/schematic_types.pb.h>
#include <project_sch.h>
#include <libraries/symbol_library_adapter.h>
#include <variant_symbol_utils.h>
 
#include <utility>
#include <validators.h>
#include <properties/property.h>
#include <properties/property_mgr.h>
 
 
std::unordered_map<TRANSFORM, int> SCH_SYMBOL::s_transformToOrientationCache;
 

std::string toUTFTildaText( const wxString& txt )
{
    std::string ret = TO_UTF8( txt );
 
    for( char& c : ret )
    {
        if( (unsigned char) c <= ' ' )
            c = '~';
    }
 
    return ret;
}
 
 
SCH_SYMBOL::SCH_SYMBOL() :
        SYMBOL( nullptr, SCH_SYMBOL_T )
{
    Init( VECTOR2I( 0, 0 ) );
    m_passthroughMode = PASSTHROUGH_MODE::DEFAULT;
    m_signalName.clear();
}
 
 
SCH_SYMBOL::SCH_SYMBOL( const LIB_SYMBOL& aSymbol, const LIB_ID& aLibId, const SCH_SHEET_PATH* aSheet, int aUnit,
                        int aBodyStyle, const VECTOR2I& aPosition, EDA_ITEM* aParent ) :
        SYMBOL( aParent, SCH_SYMBOL_T )
{
    Init( aPosition );
 
    m_unit = aUnit;
    m_bodyStyle = aBodyStyle;
    m_lib_id = aLibId;
 
    std::unique_ptr<LIB_SYMBOL> part;
 
    part = aSymbol.Flatten();
    part->SetParent();
    SetLibSymbol( part.release() );
 
    // Copy fields from the library symbol
    UpdateFields( aSheet, true, /* update style */
                  false,        /* update ref */
                  false,        /* update other fields */
                  true,         /* reset ref */
                  true          /* reset other fields */ );
 
    m_prefix = UTIL::GetRefDesPrefix( m_part->GetReferenceField().GetText() );
 
    if( aSheet )
        SetRef( aSheet, UTIL::GetRefDesUnannotated( m_prefix ) );
 
    // Inherit the include in bill of materials and board netlist settings from flattened
    // library symbol.
    m_excludedFromSim = m_part->GetExcludedFromSim();
    m_excludedFromBOM = m_part->GetExcludedFromBOM();
    m_excludedFromBoard = m_part->GetExcludedFromBoard();
    m_excludedFromPosFiles = m_part->GetExcludedFromPosFiles();
    m_passthroughMode = PASSTHROUGH_MODE::DEFAULT;
    m_signalName.clear();
}
 
 
SCH_SYMBOL::SCH_SYMBOL( const LIB_SYMBOL& aSymbol, const SCH_SHEET_PATH* aSheet, const PICKED_SYMBOL& aSel,
                        const VECTOR2I& aPosition, EDA_ITEM* aParent ) :
        SCH_SYMBOL( aSymbol, aSel.LibId, aSheet, aSel.Unit, aSel.Convert, aPosition, aParent )
{
    // Set any fields that were modified as part of the symbol selection
    for( const auto& [fieldId, fieldValue] : aSel.Fields )
    {
        if( fieldId == FIELD_T::REFERENCE )
            SetRef( aSheet, fieldValue );
        else if( SCH_FIELD* field = GetField( fieldId ) )
            field->SetText( fieldValue );
    }
}
 
 
SCH_SYMBOL::SCH_SYMBOL( const SCH_SYMBOL& aSymbol ) :
        SYMBOL( aSymbol )
{
    m_parent = aSymbol.m_parent;
    m_pos = aSymbol.m_pos;
    m_unit = aSymbol.m_unit;
    m_bodyStyle = aSymbol.m_bodyStyle;
    m_lib_id = aSymbol.m_lib_id;
    m_isInNetlist = aSymbol.m_isInNetlist;
    m_DNP = aSymbol.m_DNP;
 
    const_cast<KIID&>( m_Uuid ) = aSymbol.m_Uuid;
 
    m_transform = aSymbol.m_transform;
    m_prefix = aSymbol.m_prefix;
    m_instances = aSymbol.m_instances;
    m_instancePathIndex = aSymbol.m_instancePathIndex;
    m_fields = aSymbol.m_fields;
    m_passthroughMode = aSymbol.m_passthroughMode;
    m_signalName = aSymbol.m_signalName;
 
    // Re-parent the fields, which before this had aSymbol as parent
    for( SCH_FIELD& field : m_fields )
        field.SetParent( this );
 
    m_pins.clear();
 
    // Copy (and re-parent) the pins
    for( const std::unique_ptr<SCH_PIN>& pin : aSymbol.m_pins )
    {
        m_pins.emplace_back( std::make_unique<SCH_PIN>( *pin ) );
        m_pins.back()->SetParent( this );
    }
 
    if( aSymbol.m_part )
        SetLibSymbol( new LIB_SYMBOL( *aSymbol.m_part ) );
 
    m_fieldsAutoplaced = aSymbol.m_fieldsAutoplaced;
    m_schLibSymbolName = aSymbol.m_schLibSymbolName;
}
 
 
SCH_SYMBOL::~SCH_SYMBOL()
{
}
 
 
void SCH_SYMBOL::Init( const VECTOR2I& pos )
{
    m_layer = LAYER_DEVICE;
    m_pos = pos;
    m_unit = 1;                     // In multi unit chip - which unit to draw.
    m_bodyStyle = BODY_STYLE::BASE; // De Morgan Handling
 
    // The rotation/mirror transformation matrix. pos normal
    m_transform = TRANSFORM();
 
    auto addField = [&]( FIELD_T id, SCH_LAYER_ID layer )
    {
        m_fields.emplace_back( this, id, GetCanonicalFieldName( id ) );
        m_fields.back().SetTextPos( pos );
        m_fields.back().SetLayer( layer );
    };
 
    // construct only the mandatory fields
    addField( FIELD_T::REFERENCE, LAYER_REFERENCEPART );
    addField( FIELD_T::VALUE, LAYER_VALUEPART );
    addField( FIELD_T::FOOTPRINT, LAYER_FIELDS );
    addField( FIELD_T::DATASHEET, LAYER_FIELDS );
    addField( FIELD_T::DESCRIPTION, LAYER_FIELDS );
 
    m_prefix = wxString( wxT( "U" ) );
    m_isInNetlist = true;
    m_passthroughMode = PASSTHROUGH_MODE::DEFAULT;
    m_signalName.clear();
}
 
 
EDA_ITEM* SCH_SYMBOL::Clone() const
{
    return new SCH_SYMBOL( *this );
}
 
 
void SCH_SYMBOL::Serialize( google::protobuf::Any& aContainer ) const
{
    using namespace kiapi::common;
    using namespace kiapi::schematic::types;
 
    SchematicSymbolInstance symbol;
 
    symbol.mutable_id()->set_value( m_Uuid.AsStdString() );
    PackVector2( *symbol.mutable_position(), GetPosition(), schIUScale );
    symbol.set_locked( IsLocked() ? types::LockedState::LS_LOCKED : types::LockedState::LS_UNLOCKED );
 
    SchematicSymbolTransform* transform = symbol.mutable_transform();
    transform->set_orientation(
            ToProtoEnum<SYMBOL_ORIENTATION_PROP, SchematicSymbolOrientation>( GetOrientationProp() ) );
    transform->set_mirror_x( GetMirrorX() );
    transform->set_mirror_y( GetMirrorY() );
 
    if( GetBodyStyleCount() > 1 )
        symbol.mutable_body_style()->set_style( GetBodyStyle() );
 
    SchematicSymbol* def = symbol.mutable_definition();
    PackLibId( def->mutable_id(), m_lib_id );
 
    google::protobuf::Any any;
 
    GetField( FIELD_T::REFERENCE )->Serialize( any );
    any.UnpackTo( symbol.mutable_reference_field() );
 
    GetField( FIELD_T::VALUE )->Serialize( any );
    any.UnpackTo( symbol.mutable_value_field() );
 
    GetField( FIELD_T::FOOTPRINT )->Serialize( any );
    any.UnpackTo( symbol.mutable_footprint_field() );
 
    GetField( FIELD_T::DATASHEET )->Serialize( any );
    any.UnpackTo( symbol.mutable_datasheet_field() );
 
    GetField( FIELD_T::DESCRIPTION )->Serialize( any );
    any.UnpackTo( symbol.mutable_description_field() );
 
    for( const SCH_FIELD& field : GetFields() )
    {
        if( field.IsMandatory() )
            continue;
 
        field.Serialize( any );
        any.UnpackTo( symbol.add_user_fields() );
    }
 
    if( m_part )
    {
        m_part->GetField( FIELD_T::REFERENCE )->Serialize( any );
        any.UnpackTo( def->mutable_reference_field() );
 
        m_part->GetField( FIELD_T::VALUE )->Serialize( any );
        any.UnpackTo( def->mutable_value_field() );
 
        m_part->GetField( FIELD_T::FOOTPRINT )->Serialize( any );
        any.UnpackTo( def->mutable_footprint_field() );
 
        m_part->GetField( FIELD_T::DATASHEET )->Serialize( any );
        any.UnpackTo( def->mutable_datasheet_field() );
 
        m_part->GetField( FIELD_T::DESCRIPTION )->Serialize( any );
        any.UnpackTo( def->mutable_description_field() );
 
        for( const SCH_ITEM& drawItem : m_part->GetDrawItems() )
        {
            if( drawItem.Type() == SCH_FIELD_T && static_cast<const SCH_FIELD&>( drawItem ).IsMandatory() )
                continue;
 
            // pins in the definition are not serialized; we serialize them via PackSymbol
            // with the sheet-specific information
            if( drawItem.Type() == SCH_PIN_T )
                continue;
 
            SchematicSymbolChild* item = def->add_items();
            item->mutable_unit()->set_unit( drawItem.GetUnit() );
            item->mutable_body_style()->set_style( drawItem.GetBodyStyle() );
            item->set_is_private( drawItem.IsPrivate() );
            drawItem.Serialize( *item->mutable_item() );
        }
 
        def->set_unit_count( m_part->GetUnitCount() );
        def->set_body_style_count( m_part->GetBodyStyleCount() );
        def->set_keywords( m_part->GetKeyWords().ToUTF8() );
 
        for( const wxString& filter : m_part->GetFPFilters() )
            def->add_footprint_filters( filter.ToUTF8() );
    }
 
    symbol.set_show_pin_names( GetShowPinNames() );
    symbol.set_show_pin_numbers( GetShowPinNumbers() );
 
    PackDistance( *symbol.mutable_pin_name_offset(), GetPinNameOffset(), schIUScale );
 
    aContainer.PackFrom( symbol );
}
 
 
bool SCH_SYMBOL::Deserialize( const google::protobuf::Any& aContainer )
{
    using namespace kiapi::common;
    using namespace kiapi::common::types;
    using namespace kiapi::schematic::types;
 
    SchematicSymbolInstance symbol;
 
    if( !aContainer.UnpackTo( &symbol ) )
        return false;
 
    const_cast<::KIID&>( m_Uuid ) = ::KIID( symbol.id().value() );
    SetPosition( UnpackVector2( symbol.position(), schIUScale ) );
    SetLocked( symbol.locked() == LockedState::LS_LOCKED );
 
    SetOrientationProp( FromProtoEnum<SYMBOL_ORIENTATION_PROP>( symbol.transform().orientation() ) );
    SetMirrorX( symbol.transform().mirror_x() );
    SetMirrorY( symbol.transform().mirror_y() );
 
    const SchematicSymbol& def = symbol.definition();
 
    LIB_ID libId = UnpackLibId( def.id() );
    m_lib_id = libId;
 
    LIB_SYMBOL* libSymbol = new LIB_SYMBOL( libId.GetLibItemName() );
    libSymbol->SetLibId( libId );
 
    google::protobuf::Any any;
 
    any.PackFrom( def.reference_field() );
    libSymbol->GetField( FIELD_T::REFERENCE )->Deserialize( any );
 
    any.PackFrom( def.value_field() );
    libSymbol->GetField( FIELD_T::VALUE )->Deserialize( any );
 
    any.PackFrom( def.footprint_field() );
    libSymbol->GetField( FIELD_T::FOOTPRINT )->Deserialize( any );
 
    any.PackFrom( def.datasheet_field() );
    libSymbol->GetField( FIELD_T::DATASHEET )->Deserialize( any );
 
    any.PackFrom( def.description_field() );
    libSymbol->GetField( FIELD_T::DESCRIPTION )->Deserialize( any );
 
    std::unordered_map<::KIID, wxString> pinAltMap;
 
    for( const SchematicSymbolChild& child : def.items() )
    {
        std::optional<KICAD_T> type = TypeNameFromAny( child.item() );
 
        if( !type )
            continue;
 
        std::unique_ptr<EDA_ITEM> item = CreateItemForType( *type, libSymbol );
 
        if( !item || !item->Deserialize( child.item() ) )
            continue;
 
        SCH_ITEM* schItem = static_cast<SCH_ITEM*>( item.release() );
 
        if( schItem->Type() == SCH_PIN_T )
        {
            SchematicPin pinProto;
 
            if( child.item().UnpackTo( &pinProto ) )
            {
                if( pinProto.has_active_alternate() )
                    pinAltMap[schItem->m_Uuid] = wxString::FromUTF8( pinProto.active_alternate() );
            }
        }
 
        if( child.has_unit() )
            schItem->SetUnit( child.unit().unit() );
 
        if( child.has_body_style() )
            schItem->SetBodyStyle( child.body_style().style() );
 
        schItem->SetLayer( LAYER_DEVICE );
        schItem->SetPrivate( child.is_private() );
        libSymbol->AddDrawItem( schItem );
    }
 
    if( def.unit_count() > 0 )
        libSymbol->SetUnitCount( def.unit_count(), false );
 
    if( def.body_style_count() > 0 )
        libSymbol->SetBodyStyleCount( def.body_style_count(), false, false );
 
    if( !def.keywords().empty() )
        libSymbol->SetKeyWords( wxString::FromUTF8( def.keywords() ) );
 
    if( def.footprint_filters_size() > 0 )
    {
        wxArrayString filters;
 
        for( const std::string& filter : def.footprint_filters() )
            filters.Add( wxString::FromUTF8( filter ) );
 
        libSymbol->SetFPFilters( filters );
    }
 
    SetLibSymbol( libSymbol );
 
    if( symbol.has_body_style() )
        SetBodyStyle( symbol.body_style().style() );
 
    any.PackFrom( symbol.reference_field() );
    GetField( FIELD_T::REFERENCE )->Deserialize( any );
 
    any.PackFrom( symbol.value_field() );
    GetField( FIELD_T::VALUE )->Deserialize( any );
 
    any.PackFrom( symbol.footprint_field() );
    GetField( FIELD_T::FOOTPRINT )->Deserialize( any );
 
    any.PackFrom( symbol.datasheet_field() );
    GetField( FIELD_T::DATASHEET )->Deserialize( any );
 
    any.PackFrom( symbol.description_field() );
    GetField( FIELD_T::DESCRIPTION )->Deserialize( any );
 
    std::set<wxString> incoming;
 
    for( const SchematicField& fieldProto : symbol.user_fields() )
    {
        wxString   name = wxString::FromUTF8( fieldProto.name() );
        SCH_FIELD* existing = GetField( name );
 
        // Don't duplicate existing or mandatory fields.
        if( existing && existing->IsMandatory() )
            continue;
 
        incoming.insert( name );
        any.PackFrom( fieldProto );
 
        if( existing )
            existing->Deserialize( any );
        else
            AddField( SCH_FIELD( this, FIELD_T::USER, name ) )->Deserialize( any );
    }
 
    std::vector<wxString> toRemove;
 
    for( const SCH_FIELD& field : GetFields() )
    {
        if( !field.IsMandatory() && !incoming.count( field.GetName( false ) ) )
            toRemove.push_back( field.GetName( false ) );
    }
 
    for( const wxString& name : toRemove )
        RemoveField( name );
 
    SetShowPinNames( symbol.show_pin_names() );
    SetShowPinNumbers( symbol.show_pin_numbers() );
    SetPinNameOffset( UnpackDistance( symbol.pin_name_offset(), schIUScale ) );
 
    // The proto is storing a single pin struct that has the UUID and alternate selection
    // as well as the library pin definition.  Deserializing the pin will have set up most
    // of this, but we want to make sure that the UUIDs of the instance pins round-trip
    // so we have to set them up in advance so that UpdatePins links them up with the
    // lib pins, and then we need to set the alternates for pins if applicable
 
    m_pins.clear();
    TRANSFORM t = GetTransform().InverseTransform();
 
    for( SCH_PIN* pin : GetAllLibPins() )
    {
        m_pins.emplace_back( std::make_unique<SCH_PIN>( *pin ) );
        m_pins.back()->SetParent( this );
        const_cast<::KIID&>( m_pins.back() ->m_Uuid ) = pin->m_Uuid;
 
        // We also need to reset the lib pin to use relative coordinates
        pin->SetPosition( t.TransformCoordinate( pin->GetLocalPosition() - m_pos ) );
    }
 
    UpdatePins();
 
    for( SCH_PIN* pin : GetPins() )
    {
        if( pinAltMap.contains( pin->m_Uuid ) )
            pin->SetAlt( pinAltMap.at( pin->m_Uuid ) );
    }
 
    return true;
}
 
 
bool SCH_SYMBOL::IsMissingLibSymbol() const
{
    return m_part == nullptr;
}
 
 
bool SCH_SYMBOL::IsMovableFromAnchorPoint() const
{
    // If a symbol's anchor is not grid-aligned to its pins then moving from the anchor is
    // going to end up moving the symbol's pins off-grid.
 
    // The minimal grid size allowed to place a pin is 25 mils
    const int min_grid_size = schIUScale.MilsToIU( 25 );
 
    for( const std::unique_ptr<SCH_PIN>& pin : m_pins )
    {
        if( ( ( pin->GetPosition().x - m_pos.x ) % min_grid_size ) != 0 )
            return false;
 
        if( ( ( pin->GetPosition().y - m_pos.y ) % min_grid_size ) != 0 )
            return false;
    }
 
    return true;
}
 
 
void SCH_SYMBOL::SetLibId( const LIB_ID& aLibId )
{
    m_lib_id = aLibId;
}
 
 
wxString SCH_SYMBOL::GetSchSymbolLibraryName() const
{
    if( !m_schLibSymbolName.IsEmpty() )
        return m_schLibSymbolName;
    else
        return m_lib_id.Format();
}
 
 
void SCH_SYMBOL::SetLibSymbol( LIB_SYMBOL* aLibSymbol )
{
    wxCHECK2( !aLibSymbol || aLibSymbol->IsRoot(), aLibSymbol = nullptr );
 
    m_part.reset( aLibSymbol );
 
    // Library content changed, so cached flattened alternates may be stale.
    m_variantSymbolCache.clear();
 
    // We've just reset the library symbol, so the lib_pins, which were just
    // pointers to the old symbol, need to be cleared.
    for( auto& pin : m_pins )
        pin->SetLibPin( nullptr );
 
    UpdatePins();
}
 
 
wxString SCH_SYMBOL::GetDescription() const
{
    if( m_part )
        return m_part->GetDescription();
 
    return wxEmptyString;
}
 
 
wxString SCH_SYMBOL::GetShownDescription( int aDepth ) const
{
    if( m_part )
        return m_part->GetShownDescription( aDepth );
 
    return wxEmptyString;
}
 
 
wxString SCH_SYMBOL::GetKeyWords() const
{
    if( m_part )
        return m_part->GetKeyWords();
 
    return wxEmptyString;
}
 
 
wxString SCH_SYMBOL::GetShownKeyWords( int aDepth ) const
{
    if( m_part )
        return m_part->GetShownKeyWords( aDepth );
 
    return wxEmptyString;
}
 
 
wxString SCH_SYMBOL::GetDatasheet() const
{
    if( m_part )
        return m_part->GetDatasheetField().GetText();
 
    return wxEmptyString;
}
 
 
void SCH_SYMBOL::UpdatePins()
{
    std::map<wxString, wxString>           altPinMap;
    std::map<wxString, SCH_PIN::ALT>       altPinDefs;
    std::map<wxString, std::set<SCH_PIN*>> pinUuidMap;
    std::set<SCH_PIN*>                     unassignedSchPins;
    std::set<SCH_PIN*>                     unassignedLibPins;
 
    for( const std::unique_ptr<SCH_PIN>& pin : m_pins )
    {
        pinUuidMap[pin->GetNumber()].insert( pin.get() );
 
        unassignedSchPins.insert( pin.get() );
 
        if( !pin->GetAlt().IsEmpty() )
        {
            altPinMap[pin->GetNumber()] = pin->GetAlt();
            auto altDefIt = pin->GetAlternates().find( pin->GetAlt() );
 
            if( altDefIt != pin->GetAlternates().end() )
                altPinDefs[pin->GetNumber()] = altDefIt->second;
        }
 
        pin->SetLibPin( nullptr );
    }
 
    m_pinMap.clear();
 
    if( !m_part )
        return;
 
    for( SCH_PIN* libPin : m_part->GetPins() )
    {
        // NW: Don't filter by unit: this data-structure is used for all instances,
        // some of which might have different units.
        if( libPin->GetBodyStyle() && m_bodyStyle && m_bodyStyle != libPin->GetBodyStyle() )
            continue;
 
        SCH_PIN* pin = nullptr;
 
        auto ii = pinUuidMap.find( libPin->GetNumber() );
 
        if( ii == pinUuidMap.end() || ii->second.empty() )
        {
            unassignedLibPins.insert( libPin );
            continue;
        }
 
        auto it = ii->second.begin();
        pin = *it;
        ii->second.erase( it );
        pin->GetAlternates() = libPin->GetAlternates();
        pin->SetLibPin( libPin );
        pin->SetPosition( libPin->GetPosition() );
        pin->SetUnit( libPin->GetUnit() );
        pin->SetBodyStyle( libPin->GetBodyStyle() );
 
        unassignedSchPins.erase( pin );
 
        auto iii = altPinMap.find( libPin->GetNumber() );
 
        if( iii != altPinMap.end() )
        {
            wxString altName = iii->second;
 
            if( pin->GetAlternates().find( altName ) == pin->GetAlternates().end() )
            {
                auto defIt = altPinDefs.find( libPin->GetNumber() );
 
                if( defIt != altPinDefs.end() )
                {
                    for( const auto& [name, alt] : pin->GetAlternates() )
                    {
                        if( alt.m_Shape == defIt->second.m_Shape && alt.m_Type == defIt->second.m_Type )
                        {
                            altName = name;
                            break;
                        }
                    }
                }
            }
 
            pin->SetAlt( altName );
        }
 
        m_pinMap[libPin] = pin;
    }
 
    // Add any pins that were not found in the symbol
    for( SCH_PIN* libPin : unassignedLibPins )
    {
        SCH_PIN* pin = nullptr;
 
        // First try to re-use an existing pin
        if( !unassignedSchPins.empty() )
        {
            auto it = unassignedSchPins.begin();
            pin = *it;
            unassignedSchPins.erase( it );
        }
        else
        {
            // This is a pin that was not found in the symbol, so create a new one.
            pin = m_pins.emplace_back( std::make_unique<SCH_PIN>( SCH_PIN( this, libPin ) ) ).get();
        }
 
        m_pinMap[libPin] = pin;
        pin->GetAlternates() = libPin->GetAlternates();
        pin->SetLibPin( libPin );
        pin->SetPosition( libPin->GetPosition() );
        pin->SetUnit( libPin->GetUnit() );
        pin->SetBodyStyle( libPin->GetBodyStyle() );
        pin->SetNumber( libPin->GetNumber() );
 
        auto iii = altPinMap.find( libPin->GetNumber() );
 
        if( iii != altPinMap.end() )
        {
            wxString altName = iii->second;
 
            if( pin->GetAlternates().find( altName ) == pin->GetAlternates().end() )
            {
                auto defIt = altPinDefs.find( libPin->GetNumber() );
 
                if( defIt != altPinDefs.end() )
                {
                    for( const auto& [name, alt] : pin->GetAlternates() )
                    {
                        if( alt.m_Shape == defIt->second.m_Shape && alt.m_Type == defIt->second.m_Type )
                        {
                            altName = name;
                            break;
                        }
                    }
                }
            }
 
            pin->SetAlt( altName );
        }
    }
 
    // If we have any pins left in the symbol that were not found in the library, remove them.
    for( auto it1 = m_pins.begin(); it1 != m_pins.end() && !unassignedSchPins.empty(); )
    {
        auto it2 = unassignedSchPins.find( it1->get() );
 
        if( it2 != unassignedSchPins.end() )
        {
            it1 = m_pins.erase( it1 );
            unassignedSchPins.erase( it2 );
        }
        else
        {
            ++it1;
        }
    }
 
    // If the symbol is selected, then its pins are selected.
    if( IsSelected() )
    {
        for( std::unique_ptr<SCH_PIN>& pin : m_pins )
            pin->SetSelected();
    }
}
 
 
void SCH_SYMBOL::SetBodyStyle( int aBodyStyle )
{
    if( aBodyStyle != m_bodyStyle )
    {
        m_bodyStyle = aBodyStyle;
 
        // The body style may have a different pin layout so the update the pin map.
        UpdatePins();
    }
}
 
 
int SCH_SYMBOL::GetUnitCount() const
{
    if( m_part )
        return m_part->GetUnitCount();
 
    return 0;
}
 
 
int SCH_SYMBOL::GetBodyStyleCount() const
{
    if( m_part )
        return m_part->GetBodyStyleCount();
 
    return 0;
}
 
 
bool SCH_SYMBOL::HasDeMorganBodyStyles() const
{
    if( m_part )
        return m_part->HasDeMorganBodyStyles();
 
    return false;
}
 
 
wxString SCH_SYMBOL::GetUnitDisplayName( int aUnit, bool aLabel ) const
{
    if( m_part )
        return m_part->GetUnitDisplayName( aUnit, aLabel );
    else if( aLabel )
        return wxString::Format( _( "Unit %s" ), SubReference( aUnit ) );
    else
        return SubReference( aUnit );
}
 
 
wxString SCH_SYMBOL::GetBodyStyleDescription( int aBodyStyle, bool aLabel ) const
{
    if( m_part )
        return m_part->GetBodyStyleDescription( aBodyStyle, aLabel );
    else
        return wxT( "?" );
}
 
 
bool SCH_SYMBOL::GetInstance( SCH_SYMBOL_INSTANCE& aInstance, const KIID_PATH& aSheetPath, bool aTestFromEnd ) const
{
    if( !aTestFromEnd )
    {
        auto it = m_instancePathIndex.find( aSheetPath );
 
        if( it != m_instancePathIndex.end() )
        {
            aInstance = m_instances[it->second];
            return true;
        }
 
        return false;
    }
 
    for( const SCH_SYMBOL_INSTANCE& instance : m_instances )
    {
        if( instance.m_Path.EndsWith( aSheetPath ) )
        {
            aInstance = instance;
            return true;
        }
    }
 
    return false;
}
 
 
void SCH_SYMBOL::RemoveInstance( const SCH_SHEET_PATH& aInstancePath )
{
    RemoveInstance( aInstancePath.Path() );
}
 
 
void SCH_SYMBOL::RemoveInstance( const KIID_PATH& aInstancePath )
{
    bool removed = false;
 
    // Search for an existing path and remove it if found
    // (search from back to avoid invalidating iterator on remove)
    for( int ii = m_instances.size() - 1; ii >= 0; --ii )
    {
        if( m_instances[ii].m_Path == aInstancePath )
        {
            wxLogTrace( traceSchSheetPaths,
                        wxS( "Removing symbol instance:\n"
                             "    sheet path %s\n"
                             "    reference %s, unit %d from symbol %s." ),
                        aInstancePath.AsString(), m_instances[ii].m_Reference, m_instances[ii].m_Unit,
                        m_Uuid.AsString() );
 
            m_instances.erase( m_instances.begin() + ii );
            removed = true;
        }
    }
 
    if( removed )
        rebuildInstancePathIndex();
}
 
 
void SCH_SYMBOL::rebuildInstancePathIndex()
{
    m_instancePathIndex.clear();
    m_instancePathIndex.reserve( m_instances.size() );
 
    for( size_t i = 0; i < m_instances.size(); ++i )
        m_instancePathIndex[m_instances[i].m_Path] = i;
}
 
 
void SCH_SYMBOL::AddHierarchicalReference( const KIID_PATH& aPath, const wxString& aRef, int aUnit )
{
    SCH_SYMBOL_INSTANCE instance;
    instance.m_Path = aPath;
    instance.m_Reference = aRef;
    instance.m_Unit = aUnit;
 
    AddHierarchicalReference( instance );
}
 
 
void SCH_SYMBOL::AddHierarchicalReference( const SCH_SYMBOL_INSTANCE& aInstance )
{
    RemoveInstance( aInstance.m_Path );
 
    SCH_SYMBOL_INSTANCE instance = aInstance;
 
    wxLogTrace( traceSchSheetPaths,
                wxS( "Adding symbol '%s' instance:\n"
                     "    sheet path '%s'\n"
                     "    reference '%s'\n"
                     "    unit %d\n" ),
                m_Uuid.AsString(), instance.m_Path.AsString(), instance.m_Reference, instance.m_Unit );
 
    m_instancePathIndex[instance.m_Path] = m_instances.size();
    m_instances.push_back( instance );
 
    // This should set the default instance to the first saved instance data for each symbol
    // when importing sheets.
    if( m_instances.size() == 1 )
    {
        GetField( FIELD_T::REFERENCE )->SetText( instance.m_Reference );
        m_unit = instance.m_Unit;
    }
}
 
 
const wxString SCH_SYMBOL::GetRef( const SCH_SHEET_PATH* sheet, bool aIncludeUnit ) const
{
    KIID_PATH path = sheet->Path();
    wxString  ref;
    wxString  subRef;
 
    wxLogTrace( traceSchSymbolRef, "GetRef for symbol %s on path %s (sheet path has %zu sheets)",
                m_Uuid.AsString(), path.AsString(), sheet->size() );
 
    wxLogTrace( traceSchSymbolRef, "  Symbol has %zu instance references", m_instances.size() );
 
    if( auto it = m_instancePathIndex.find( path ); it != m_instancePathIndex.end() )
    {
        const SCH_SYMBOL_INSTANCE& instance = m_instances[it->second];
 
        ref = instance.m_Reference;
        subRef = SubReference( instance.m_Unit );
        wxLogTrace( traceSchSymbolRef, "  MATCH FOUND: ref=%s", ref );
    }
 
    // If it was not found in m_Paths array, then see if it is in m_Field[REFERENCE] -- if so,
    // use this as a default for this path.  This will happen if we load a version 1 schematic
    // file.  It will also mean that multiple instances of the same sheet by default all have
    // the same symbol references, but perhaps this is best.
    if( ref.IsEmpty() && !GetField( FIELD_T::REFERENCE )->GetText().IsEmpty() )
    {
        ref = GetField( FIELD_T::REFERENCE )->GetText();
        wxLogTrace( traceSchSymbolRef, "  Using fallback from REFERENCE field: %s", ref );
    }
 
    if( ref.IsEmpty() )
    {
        ref = UTIL::GetRefDesUnannotated( m_prefix );
        wxLogTrace( traceSchSymbolRef, "  Using unannotated reference: %s", ref );
    }
 
    if( aIncludeUnit && GetUnitCount() > 1 )
        ref += subRef;
 
    wxLogTrace( traceSchSymbolRef, "  Final reference: %s", ref );
 
    return ref;
}
 
 
void SCH_SYMBOL::SetRefProp( const wxString& aRef )
{
    FIELD_VALIDATOR validator( FIELD_T::REFERENCE );
 
    if( validator.DoValidate( aRef, nullptr ) )
        SetRef( &Schematic()->CurrentSheet(), aRef );
}
 
 
void SCH_SYMBOL::SetValueProp( const wxString& aValue )
{
    wxString currentVariant = Schematic()->GetCurrentVariant();
    SetValueFieldText( aValue, &Schematic()->CurrentSheet(), currentVariant );
}
 
 
void SCH_SYMBOL::SetRef( const SCH_SHEET_PATH* sheet, const wxString& ref )
{
    KIID_PATH path = sheet->Path();
 
    if( auto it = m_instancePathIndex.find( path ); it != m_instancePathIndex.end() )
        m_instances[it->second].m_Reference = ref;
    else
        AddHierarchicalReference( path, ref, m_unit );
 
    for( std::unique_ptr<SCH_PIN>& pin : m_pins )
        pin->ClearDefaultNetName( sheet );
 
    if( Schematic() && *sheet == Schematic()->CurrentSheet() )
        GetField( FIELD_T::REFERENCE )->SetText( ref );
 
    // Reinit the m_prefix member if needed
    m_prefix = UTIL::GetRefDesPrefix( ref );
 
    if( m_prefix.IsEmpty() )
        m_prefix = wxT( "U" );
 
    // Power symbols have references starting with # and are not included in netlists
    m_isInNetlist = !ref.StartsWith( wxT( "#" ) );
}
 
 
void SCH_SYMBOL::SetFieldText( const wxString& aFieldName, const wxString& aFieldText, const SCH_SHEET_PATH* aPath,
                               const wxString& aVariantName )
{
    wxCHECK( !aFieldName.IsEmpty(), /* void */ );
 
    SCH_FIELD* field = GetField( aFieldName );
 
    wxCHECK( field, /* void */ );
 
    switch( field->GetId() )
    {
    case FIELD_T::REFERENCE:
        wxCHECK( aPath, /* void */ );
        SetRef( aPath, aFieldText );
        break;
 
    default:
    {
        wxString defaultText = field->GetText( aPath );
 
        if( aVariantName.IsEmpty() )
        {
            if( aFieldText != defaultText )
                field->SetText( aFieldText );
        }
        else
        {
            SCH_SYMBOL_INSTANCE* instance = getInstance( *aPath );
 
            wxCHECK( instance, /* void */ );
 
            // Diff against the value the variant resolves to without an explicit override so
            // alternate symbol fields read back through the UI are not re-stored as overrides.
            if( LIB_SYMBOL* altSymbol = GetVariantLibSymbol( aVariantName, *aPath ) )
            {
                const SCH_FIELD* altField = altSymbol->GetField( aFieldName );
 
                if( altField && !altField->GetText().IsEmpty() )
                    defaultText = altField->GetText();
            }
 
            if( instance->m_Variants.contains( aVariantName ) )
            {
                if( aFieldText != defaultText )
                    instance->m_Variants[aVariantName].m_Fields[aFieldName] = aFieldText;
                else
                    instance->m_Variants[aVariantName].m_Fields.erase( aFieldName );
            }
            else if( aFieldText != defaultText )
            {
                SCH_SYMBOL_VARIANT newVariant( aVariantName );
 
                newVariant.InitializeAttributes( *this );
                newVariant.m_Fields[aFieldName] = aFieldText;
                instance->m_Variants.insert( std::make_pair( aVariantName, newVariant ) );
            }
        }
 
        break;
    }
    }
}
 
 
wxString SCH_SYMBOL::GetFieldText( const wxString& aFieldName, const SCH_SHEET_PATH* aPath,
                                   const wxString& aVariantName ) const
{
    wxCHECK( !aFieldName.IsEmpty(), wxEmptyString );
 
    const SCH_FIELD* field = GetField( aFieldName );
 
    wxCHECK( field, wxEmptyString );
 
    switch( field->GetId() )
    {
    case FIELD_T::REFERENCE:
        wxCHECK( aPath, field->GetText() );
        return GetRef( aPath, false );
        break;
 
    case FIELD_T::FOOTPRINT:
        if( !aVariantName.IsEmpty() && aPath )
        {
            const SCH_SYMBOL_INSTANCE* instance = getInstance( *aPath );
 
            if( instance && instance->m_Variants.contains( aVariantName )
              && instance->m_Variants.at( aVariantName ).m_Fields.contains( aFieldName ) )
            {
                return instance->m_Variants.at( aVariantName ).m_Fields.at( aFieldName );
            }
 
            LIB_SYMBOL* altSymbol = GetVariantLibSymbol( aVariantName, *aPath );
 
            if( altSymbol )
            {
                const SCH_FIELD* altField = altSymbol->GetField( FIELD_T::FOOTPRINT );
 
                if( altField && !altField->GetText().IsEmpty() )
                    return altField->GetText();
            }
        }
 
        return GetFootprintFieldText( false, nullptr, false );
 
    default:
        if( aVariantName.IsEmpty() )
        {
            return field->GetText();
        }
        else if( aPath )
        {
            const SCH_SYMBOL_INSTANCE* instance = getInstance( *aPath );
 
            if( instance && instance->m_Variants.contains( aVariantName ) )
            {
                const SCH_SYMBOL_VARIANT& variant = instance->m_Variants.at( aVariantName );
 
                if( variant.m_Fields.contains( aFieldName ) )
                    return variant.m_Fields.at( aFieldName );
 
                LIB_SYMBOL* altSymbol = GetVariantLibSymbol( aVariantName, *aPath );
 
                if( altSymbol )
                {
                    const SCH_FIELD* altField = altSymbol->GetField( aFieldName );
 
                    if( altField && !altField->GetText().IsEmpty() )
                        return altField->GetText();
                }
            }
        }
 
        break;
    }
 
    return field->GetText();
}
 
 
bool SCH_SYMBOL::IsAnnotated( const SCH_SHEET_PATH* aSheet ) const
{
    KIID_PATH path = aSheet->Path();
 
    for( const SCH_SYMBOL_INSTANCE& instance : m_instances )
    {
        if( instance.m_Path == path )
            return !instance.m_Reference.IsEmpty() && instance.m_Reference.Last() != '?';
    }
 
    return false;
}
 
 
void SCH_SYMBOL::UpdatePrefix()
{
    wxString refDesignator = GetField( FIELD_T::REFERENCE )->GetText();
 
    refDesignator.Replace( "~", " " );
 
    wxString prefix = refDesignator;
 
    while( prefix.Length() )
    {
        wxUniCharRef last = prefix.Last();
 
        if( ( last >= '0' && last <= '9' ) || last == '?' || last == '*' )
            prefix.RemoveLast();
        else
            break;
    }
 
    // Avoid a prefix containing trailing/leading spaces
    prefix.Trim( true );
    prefix.Trim( false );
 
    if( !prefix.IsEmpty() )
        SetPrefix( prefix );
}
 
 
wxString SCH_SYMBOL::SubReference( int aUnit, bool aAddSeparator ) const
{
    // A custom unit display name overrides the default A/B/C (or numeric) suffix.
    if( m_part )
    {
        const std::map<int, wxString>& names = m_part->GetUnitDisplayNames();
        auto                           it = names.find( aUnit );
 
        if( it != names.end() && !it->second.IsEmpty() )
        {
            wxString subRef;
 
            if( SCHEMATIC* schematic = Schematic() )
            {
                int sep = schematic->Settings().m_SubpartIdSeparator;
 
                if( sep != 0 && aAddSeparator )
                    subRef << wxChar( sep );
            }
 
            subRef << it->second;
            return subRef;
        }
    }
 
    if( SCHEMATIC* schematic = Schematic() )
        return schematic->Settings().SubReference( aUnit, aAddSeparator );
 
    return LIB_SYMBOL::LetterSubReference( aUnit, 'A' );
}
 
 
int SCH_SYMBOL::GetUnitSelection( const SCH_SHEET_PATH* aSheet ) const
{
    KIID_PATH path = aSheet->Path();
 
    if( auto it = m_instancePathIndex.find( path ); it != m_instancePathIndex.end() )
        return m_instances[it->second].m_Unit;
 
    // If it was not found in m_Paths array, then use m_unit.  This will happen if we load a
    // version 1 schematic file.
    return m_unit;
}
 
 
void SCH_SYMBOL::SetUnitSelection( const SCH_SHEET_PATH* aSheet, int aUnitSelection )
{
    KIID_PATH path = aSheet->Path();
 
    if( auto it = m_instancePathIndex.find( path ); it != m_instancePathIndex.end() )
    {
        m_instances[it->second].m_Unit = aUnitSelection;
        return;
    }
 
    // didn't find it; better add it
    AddHierarchicalReference( path, UTIL::GetRefDesUnannotated( m_prefix ), aUnitSelection );
}
 
 
void SCH_SYMBOL::SetDNP( bool aEnable, const SCH_SHEET_PATH* aInstance, const wxString& aVariantName )
{
    if( !aInstance || aVariantName.IsEmpty() )
    {
        m_DNP = aEnable;
        return;
    }
 
    SCH_SYMBOL_INSTANCE* instance = getInstance( *aInstance );
 
    wxCHECK_MSG( instance, /* void */,
                 wxString::Format( wxS( "Cannot get DNP attribute for invalid sheet path '%s'." ),
                                   aInstance->PathHumanReadable() ) );
 
    if( aVariantName.IsEmpty() )
    {
        m_DNP = aEnable;
    }
    else
    {
        if( instance->m_Variants.contains( aVariantName ) )
        {
            instance->m_Variants[aVariantName].m_DNP = aEnable;
        }
        else if( aEnable != m_DNP )
        {
            SCH_SYMBOL_VARIANT variant( aVariantName );
 
            variant.InitializeAttributes( *this );
            variant.m_DNP = aEnable;
            AddVariant( *aInstance, variant );
        }
    }
}
 
 
bool SCH_SYMBOL::GetDNP( const SCH_SHEET_PATH* aInstance, const wxString& aVariantName ) const
{
    if( !aInstance || aVariantName.IsEmpty() )
        return m_DNP;
 
    SCH_SYMBOL_INSTANCE instance;
 
    if( !GetInstance( instance, aInstance->Path() ) )
        return m_DNP;
 
    if( instance.m_Variants.contains( aVariantName ) )
        return instance.m_Variants[aVariantName].m_DNP;
 
    return m_DNP;
}
 
 
void SCH_SYMBOL::SetPinMapOverride( const PIN_MAP_INSTANCE_OVERRIDE& aOverride, const SCH_SHEET_PATH* aInstance,
                                    const wxString& aVariantName )
{
    if( !aInstance || aVariantName.IsEmpty() )
    {
        m_pinMapOverride = aOverride;
        return;
    }
 
    SCH_SYMBOL_INSTANCE* instance = getInstance( *aInstance );
 
    wxCHECK_MSG( instance, /* void */,
                 wxString::Format( wxS( "Cannot set pin map override for invalid sheet path '%s'." ),
                                   aInstance->PathHumanReadable() ) );
 
    if( instance->m_Variants.contains( aVariantName ) )
    {
        instance->m_Variants[aVariantName].m_PinMapOverride = aOverride;
    }
    else if( !aOverride.IsDefault() )
    {
        SCH_SYMBOL_VARIANT variant( aVariantName );
 
        variant.InitializeAttributes( *this );
        variant.m_PinMapOverride = aOverride;
        AddVariant( *aInstance, variant );
    }
}
 
 
PIN_MAP_INSTANCE_OVERRIDE SCH_SYMBOL::GetPinMapOverride( const SCH_SHEET_PATH* aInstance,
                                                         const wxString&       aVariantName ) const
{
    PIN_MAP_INSTANCE_OVERRIDE result = m_pinMapOverride;
 
    if( aInstance && !aVariantName.IsEmpty() )
    {
        SCH_SYMBOL_INSTANCE instance;
 
        if( GetInstance( instance, aInstance->Path() ) && instance.m_Variants.contains( aVariantName ) )
            result = instance.m_Variants[aVariantName].m_PinMapOverride;
    }
 
    // Units 2..N follow unit 1's record; resolve that here so callers never see a delegate.
    if( result.IsDelegate() && aInstance )
        result = resolveDelegatedPinMapOverride( *aInstance, aVariantName );
 
    return result;
}
 
 
PIN_MAP_INSTANCE_OVERRIDE SCH_SYMBOL::resolveDelegatedPinMapOverride( const SCH_SHEET_PATH& aSheet,
                                                                      const wxString&       aVariantName ) const
{
    if( !Schematic() )
        return PIN_MAP_INSTANCE_OVERRIDE();
 
    wxString ref = GetRef( &aSheet );
 
    for( const SCH_SHEET_PATH& sheet : Schematic()->Hierarchy() )
    {
        for( SCH_ITEM* item : sheet.LastScreen()->Items().OfType( SCH_SYMBOL_T ) )
        {
            SCH_SYMBOL* sibling = static_cast<SCH_SYMBOL*>( item );
 
            if( sibling == this || sibling->GetUnit() != 1 )
                continue;
 
            if( sibling->GetRef( &sheet ).CmpNoCase( ref ) != 0 )
                continue;
 
            PIN_MAP_INSTANCE_OVERRIDE unit1 = sibling->GetPinMapOverride( &sheet, aVariantName );
 
            // Guard against a unit-1 record that itself (incorrectly) delegates.
            if( unit1.IsDelegate() )
                return PIN_MAP_INSTANCE_OVERRIDE();
 
            return unit1;
        }
    }
 
    return PIN_MAP_INSTANCE_OVERRIDE();
}
 
 
void SCH_SYMBOL::SetExcludedFromBOM( bool aEnable, const SCH_SHEET_PATH* aInstance, const wxString& aVariantName )
{
    if( !aInstance || aVariantName.IsEmpty() )
    {
        m_excludedFromBOM = aEnable;
        return;
    }
 
    SCH_SYMBOL_INSTANCE* instance = getInstance( *aInstance );
 
    wxCHECK_MSG( instance, /* void */,
                 wxString::Format( wxS( "Cannot get DNP attribute for invalid sheet path '%s'." ),
                                   aInstance->PathHumanReadable() ) );
 
    if( aVariantName.IsEmpty() )
    {
        m_excludedFromBOM = aEnable;
    }
    else
    {
        if( instance->m_Variants.contains( aVariantName ) )
        {
            instance->m_Variants[aVariantName].m_ExcludedFromBOM = aEnable;
        }
        else if( aEnable != m_excludedFromBOM )
        {
            SCH_SYMBOL_VARIANT variant( aVariantName );
 
            variant.InitializeAttributes( *this );
            variant.m_ExcludedFromBOM = aEnable;
            AddVariant( *aInstance, variant );
        }
    }
}
 
 
bool SCH_SYMBOL::GetExcludedFromBOM( const SCH_SHEET_PATH* aInstance, const wxString& aVariantName ) const
{
    if( !aInstance || aVariantName.IsEmpty() )
        return m_excludedFromBOM;
 
    SCH_SYMBOL_INSTANCE instance;
 
    if( !GetInstance( instance, aInstance->Path() ) )
        return m_excludedFromBOM;
 
    if( instance.m_Variants.contains( aVariantName ) )
        return instance.m_Variants[aVariantName].m_ExcludedFromBOM;
 
    // If the variant has not been defined yet, return the default exclude from BOM setting.
    return m_excludedFromBOM;
}
 
 
void SCH_SYMBOL::SetExcludedFromSim( bool aEnable, const SCH_SHEET_PATH* aInstance, const wxString& aVariantName )
{
    if( !aInstance || aVariantName.IsEmpty() )
    {
        m_excludedFromSim = aEnable;
        return;
    }
 
    SCH_SYMBOL_INSTANCE* instance = getInstance( *aInstance );
 
    wxCHECK_MSG( instance, /* void */,
                 wxString::Format( wxS( "Cannot get DNP attribute for invalid sheet path '%s'." ),
                                   aInstance->PathHumanReadable() ) );
 
    if( aVariantName.IsEmpty() )
    {
        m_excludedFromSim = aEnable;
    }
    else
    {
        if( instance->m_Variants.contains( aVariantName ) )
        {
            instance->m_Variants[aVariantName].m_ExcludedFromSim = aEnable;
        }
        else if( aEnable != m_excludedFromSim )
        {
            SCH_SYMBOL_VARIANT variant( aVariantName );
 
            variant.InitializeAttributes( *this );
            variant.m_ExcludedFromSim = aEnable;
            AddVariant( *aInstance, variant );
        }
    }
}
 
 
bool SCH_SYMBOL::GetExcludedFromSim( const SCH_SHEET_PATH* aInstance, const wxString& aVariantName ) const
{
    if( !aInstance || aVariantName.IsEmpty() )
        return m_excludedFromSim;
 
    SCH_SYMBOL_INSTANCE instance;
 
    if( !GetInstance( instance, aInstance->Path() ) )
        return m_excludedFromSim;
 
    if( instance.m_Variants.contains( aVariantName ) )
        return instance.m_Variants[aVariantName].m_ExcludedFromSim;
 
    // If variant is not defined yet, return default exclude from simulation setting.
    return m_excludedFromSim;
}
 
 
void SCH_SYMBOL::SetExcludedFromBoard( bool aEnable, const SCH_SHEET_PATH* aInstance,
                                       const wxString& aVariantName )
{
    if( !aInstance || aVariantName.IsEmpty() )
    {
        m_excludedFromBoard = aEnable;
        return;
    }
 
    SCH_SYMBOL_INSTANCE* instance = getInstance( *aInstance );
 
    wxCHECK_MSG( instance, /* void */,
                 wxString::Format( wxS( "Cannot set exclude from board for invalid sheet path '%s'." ),
                                   aInstance->PathHumanReadable() ) );
 
    if( aVariantName.IsEmpty() )
    {
        m_excludedFromBoard = aEnable;
    }
    else
    {
        if( instance->m_Variants.contains( aVariantName ) )
        {
            instance->m_Variants[aVariantName].m_ExcludedFromBoard = aEnable;
        }
        else if( aEnable != m_excludedFromBoard )
        {
            SCH_SYMBOL_VARIANT variant( aVariantName );
 
            variant.InitializeAttributes( *this );
            variant.m_ExcludedFromBoard = aEnable;
            AddVariant( *aInstance, variant );
        }
    }
}
 
 
bool SCH_SYMBOL::GetExcludedFromBoard( const SCH_SHEET_PATH* aInstance,
                                       const wxString& aVariantName ) const
{
    if( !aInstance || aVariantName.IsEmpty() )
        return m_excludedFromBoard;
 
    SCH_SYMBOL_INSTANCE instance;
 
    if( !GetInstance( instance, aInstance->Path() ) )
        return m_excludedFromBoard;
 
    if( instance.m_Variants.contains( aVariantName ) )
        return instance.m_Variants[aVariantName].m_ExcludedFromBoard;
 
    // If variant is not defined yet, return default exclude from board setting.
    return m_excludedFromBoard;
}
 
 
void SCH_SYMBOL::SetExcludedFromPosFiles( bool aEnable, const SCH_SHEET_PATH* aInstance,
                                          const wxString& aVariantName )
{
    if( !aInstance || aVariantName.IsEmpty() )
    {
        m_excludedFromPosFiles = aEnable;
        return;
    }
 
    SCH_SYMBOL_INSTANCE* instance = getInstance( *aInstance );
 
    wxCHECK_MSG( instance, /* void */,
                 wxString::Format( wxS( "Cannot set exclude from pos files for invalid sheet path '%s'." ),
                                   aInstance->PathHumanReadable() ) );
 
    if( aVariantName.IsEmpty() )
    {
        m_excludedFromPosFiles = aEnable;
    }
    else
    {
        if( instance->m_Variants.contains( aVariantName ) )
        {
            instance->m_Variants[aVariantName].m_ExcludedFromPosFiles = aEnable;
        }
        else if( aEnable != m_excludedFromPosFiles )
        {
            SCH_SYMBOL_VARIANT variant( aVariantName );
 
            variant.InitializeAttributes( *this );
            variant.m_ExcludedFromPosFiles = aEnable;
            AddVariant( *aInstance, variant );
        }
    }
}
 
 
bool SCH_SYMBOL::GetExcludedFromPosFiles( const SCH_SHEET_PATH* aInstance,
                                          const wxString& aVariantName ) const
{
    if( !aInstance || aVariantName.IsEmpty() )
        return m_excludedFromPosFiles;
 
    SCH_SYMBOL_INSTANCE instance;
 
    if( !GetInstance( instance, aInstance->Path() ) )
        return m_excludedFromPosFiles;
 
    if( instance.m_Variants.contains( aVariantName ) )
        return instance.m_Variants[aVariantName].m_ExcludedFromPosFiles;
 
    // If variant is not defined yet, return default exclude from position files setting.
    return m_excludedFromPosFiles;
}
 
 
void SCH_SYMBOL::SetUnitSelection( int aUnitSelection )
{
    for( SCH_SYMBOL_INSTANCE& instance : m_instances )
        instance.m_Unit = aUnitSelection;
}
 
 
const wxString SCH_SYMBOL::GetValue( bool aResolve, const SCH_SHEET_PATH* aInstance,
                                     bool aAllowExtraText, const wxString& aVariantName ) const
{
    if( aVariantName.IsEmpty() || !aInstance )
    {
        if( aResolve )
            return GetField( FIELD_T::VALUE )->GetShownText( aInstance, aAllowExtraText );
 
        return GetField( FIELD_T::VALUE )->GetText();
    }
 
    std::optional variant = GetVariant( *aInstance, aVariantName );
 
    if( variant )
    {
        const wxString& fieldName = GetField( FIELD_T::VALUE )->GetName();
 
        if( variant->m_Fields.contains( fieldName ) )
            return variant->m_Fields[fieldName];
 
        LIB_SYMBOL* altSymbol = GetVariantLibSymbol( aVariantName, *aInstance );
 
        if( altSymbol )
        {
            const SCH_FIELD* altField = altSymbol->GetField( FIELD_T::VALUE );
 
            if( altField && !altField->GetText().IsEmpty() )
                return altField->GetText();
        }
    }
 
    // Fall back to default value when variant doesn't have an override
    if( aResolve )
        return GetField( FIELD_T::VALUE )->GetShownText( aInstance, aAllowExtraText );
 
    return GetField( FIELD_T::VALUE )->GetText();
}
 
 
void SCH_SYMBOL::SetValueFieldText( const wxString& aValue, const SCH_SHEET_PATH* aInstance,
                                    const wxString& aVariantName )
{
    if( !aInstance || aVariantName.IsEmpty() )
    {
        GetField( FIELD_T::VALUE )->SetText( aValue );
        return;
    }
 
    SCH_SYMBOL_INSTANCE* instance = getInstance( *aInstance );
 
    wxCHECK( instance, /* void */ );
 
    wxString fieldName = GetField( FIELD_T::VALUE )->GetName();
 
    if( instance->m_Variants.contains( aVariantName ) )
    {
        instance->m_Variants[aVariantName].m_Fields[fieldName] = aValue;
    }
    else
    {
        SCH_SYMBOL_VARIANT newVariant( aVariantName );
 
        newVariant.InitializeAttributes( *this );
        newVariant.m_Fields[fieldName] = aValue;
        instance->m_Variants.insert( std::make_pair( aVariantName, newVariant ) );
    }
}
 
 
const wxString SCH_SYMBOL::GetFootprintFieldText( bool aResolve, const SCH_SHEET_PATH* aPath,
                                                  bool aAllowExtraText, const wxString& aVariantName ) const
{
    if( aResolve )
        return GetField( FIELD_T::FOOTPRINT )->GetShownText( aPath, aAllowExtraText, 0, aVariantName );
 
    return GetField( FIELD_T::FOOTPRINT )->GetText();
}
 
 
void SCH_SYMBOL::SetFootprintFieldText( const wxString& aFootprint )
{
    GetField( FIELD_T::FOOTPRINT )->SetText( aFootprint );
}
 
 
SCH_FIELD* SCH_SYMBOL::GetField( FIELD_T aFieldType )
{
    if( SCH_FIELD* field = FindField( m_fields, aFieldType ) )
        return field;
 
    m_fields.emplace_back( this, aFieldType );
    return &m_fields.back();
}
 
 
const SCH_FIELD* SCH_SYMBOL::GetField( FIELD_T aFieldType ) const
{
    return FindField( m_fields, aFieldType );
}
 
 
SCH_FIELD* SCH_SYMBOL::GetField( const wxString& aFieldName )
{
    return FindField( m_fields, aFieldName );
}
 
 
const SCH_FIELD* SCH_SYMBOL::GetField( const wxString& aFieldName ) const
{
    return FindField( m_fields, aFieldName );
}
 
 
void SCH_SYMBOL::GetFields( std::vector<SCH_FIELD*>& aVector, bool aVisibleOnly ) const
{
    for( const SCH_FIELD& field : m_fields )
    {
        if( aVisibleOnly )
        {
            if( !field.IsVisible() || field.GetText().IsEmpty() )
                continue;
        }
 
        aVector.push_back( const_cast<SCH_FIELD*>( &field ) );
    }
 
    std::sort( aVector.begin(), aVector.end(),
               []( SCH_FIELD* lhs, SCH_FIELD* rhs )
               {
                   return lhs->GetOrdinal() < rhs->GetOrdinal();
               } );
}
 
 
int SCH_SYMBOL::GetNextFieldOrdinal() const
{
    return NextFieldOrdinal( m_fields );
}
 
 
SCH_FIELD* SCH_SYMBOL::AddField( const SCH_FIELD& aField )
{
    m_fields.push_back( aField );
    return &m_fields.back();
}
 
 
void SCH_SYMBOL::RemoveField( const wxString& aFieldName )
{
    for( unsigned ii = 0; ii < m_fields.size(); ++ii )
    {
        if( m_fields[ii].IsMandatory() )
            continue;
 
        if( aFieldName == m_fields[ii].GetName( false ) )
        {
            m_fields.erase( m_fields.begin() + ii );
            return;
        }
    }
}
 
 
SCH_FIELD* SCH_SYMBOL::FindFieldCaseInsensitive( const wxString& aFieldName )
{
    for( SCH_FIELD& field : m_fields )
    {
        if( field.GetName().IsSameAs( aFieldName, false ) )
            return &field;
    }
 
    return nullptr;
}
 
 
const SCH_FIELD* SCH_SYMBOL::FindFieldCaseInsensitive( const wxString& aFieldName ) const
{
    for( const SCH_FIELD& field : m_fields )
    {
        if( field.GetName().IsSameAs( aFieldName, false ) )
            return &field;
    }
 
    return nullptr;
}
 
 
void SCH_SYMBOL::UpdateFields( const SCH_SHEET_PATH* aPath, bool aUpdateStyle, bool aUpdateRef, bool aUpdateOtherFields,
                               bool aResetRef, bool aResetOtherFields )
{
    if( m_part )
    {
        std::vector<SCH_FIELD*> fields;
        m_part->GetFields( fields );
 
        for( const SCH_FIELD* libField : fields )
        {
            SCH_FIELD* schField;
            FIELD_T    fieldType = FIELD_T::USER;
 
            if( libField->IsMandatory() )
            {
                fieldType = libField->GetId();
                schField = GetField( fieldType );
            }
            else
            {
                schField = GetField( libField->GetCanonicalName() );
 
                if( !schField )
                {
                    schField = AddField( SCH_FIELD( this, FIELD_T::USER, libField->GetCanonicalName() ) );
                    schField->ImportValues( *libField );
                    schField->SetTextPos( m_pos + libField->GetTextPos() );
                }
            }
 
            schField->SetPrivate( libField->IsPrivate() );
 
            if( aUpdateStyle )
            {
                schField->ImportValues( *libField );
                schField->SetTextPos( m_pos + libField->GetTextPos() );
            }
 
            if( fieldType == FIELD_T::REFERENCE && aPath )
            {
                if( aResetRef )
                    SetRef( aPath, m_part->GetField( FIELD_T::REFERENCE )->GetText() );
                else if( aUpdateRef )
                    SetRef( aPath, libField->GetText() );
            }
            else if( fieldType == FIELD_T::VALUE )
            {
                SetValueFieldText( UnescapeString( libField->GetText() ) );
            }
            else if( fieldType == FIELD_T::DATASHEET )
            {
                if( aResetOtherFields )
                    schField->SetText( GetDatasheet() ); // alias-specific value
                else if( aUpdateOtherFields )
                    schField->SetText( libField->GetText() );
            }
            else
            {
                if( aResetOtherFields || aUpdateOtherFields )
                    schField->SetText( libField->GetText() );
            }
        }
    }
}
 
 
void SCH_SYMBOL::SyncOtherUnits( const SCH_SHEET_PATH& aSourceSheet, SCH_COMMIT& aCommit,
                                 PROPERTY_BASE* aProperty, const wxString& aVariantName )
{
    bool updateValue = true;
    bool updateExclFromBOM = true;
    bool updateExclFromBoard = true;
    bool updateExclFromPosFiles = true;
    bool updateDNP = true;
    bool updateOtherFields = true;
    bool updatePins = true;
    bool updatePinMapOverride = true;
 
    if( aProperty )
    {
        updateValue = aProperty->Name() == _HKI( "Value" );
        updateExclFromBoard = aProperty->Name() == _HKI( "Exclude From Board" );
        updateExclFromBOM = aProperty->Name() == _HKI( "Exclude From Bill of Materials" );
        updateExclFromPosFiles = aProperty->Name() == _HKI( "Exclude From Position Files" );
        updateDNP = aProperty->Name() == _HKI( "Do not Populate" );
        updatePinMapOverride = aProperty->Name() == wxS( "Pin Map Mode" ) || aProperty->Name() == wxS( "Pin Map Name" );
        updateOtherFields = false;
        updatePins = false;
    }
 
    if( !updateValue && !updateExclFromBOM && !updateExclFromBoard && !updateExclFromPosFiles && !updateDNP
        && !updateOtherFields && !updatePins && !updatePinMapOverride )
    {
        return;
    }
 
    // Keep fields other than the reference, include/exclude flags, and alternate pin assignments
    // in sync in multi-unit parts.
    if( GetUnitCount() > 1 && IsAnnotated( &aSourceSheet ) )
    {
        wxString ref = GetRef( &aSourceSheet );
 
        for( SCH_SHEET_PATH& sheet : Schematic()->Hierarchy() )
        {
            SCH_SCREEN*              screen = sheet.LastScreen();
            std::vector<SCH_SYMBOL*> otherUnits;
 
            CollectOtherUnits( ref, m_unit, m_lib_id, sheet, &otherUnits );
 
            for( SCH_SYMBOL* otherUnit : otherUnits )
            {
                aCommit.Modify( otherUnit, screen );
 
                if( updateValue )
                {
                    otherUnit->SetFieldText( GetField( FIELD_T::VALUE )->GetName(),
                                             GetValue( false, &aSourceSheet, false, aVariantName ), &sheet,
                                             aVariantName );
                }
 
                if( updateOtherFields )
                {
                    for( SCH_FIELD& field : m_fields )
                    {
                        if( field.GetId() == FIELD_T::REFERENCE || field.GetId() == FIELD_T::VALUE )
                        {
                            // already handled
                            continue;
                        }
 
                        SCH_FIELD* otherField;
 
                        if( field.IsMandatory() )
                            otherField = otherUnit->GetField( field.GetId() );
                        else
                            otherField = otherUnit->GetField( field.GetName() );
 
                        if( otherField )
                        {
                            otherField->SetText( field.GetText( &aSourceSheet, aVariantName ), &sheet, aVariantName );
                        }
                        else
                        {
                            SCH_FIELD newField( field );
                            const_cast<KIID&>( newField.m_Uuid ) = KIID();
 
                            newField.Offset( -GetPosition() );
                            newField.Offset( otherUnit->GetPosition() );
 
                            newField.SetParent( otherUnit );
                            SCH_FIELD* addedField = otherUnit->AddField( newField );
 
                            if( !aVariantName.IsEmpty() )
                            {
                                addedField->SetText( field.GetText( &aSourceSheet, aVariantName ), &sheet,
                                                     aVariantName );
                            }
                        }
                    }
 
                    for( int ii = (int) otherUnit->GetFields().size() - 1; ii >= 0; ii-- )
                    {
                        SCH_FIELD& otherField = otherUnit->GetFields()[ii];
 
                        if( !otherField.IsMandatory() && !GetField( otherField.GetName() ) )
                            otherUnit->GetFields().erase( otherUnit->GetFields().begin() + ii );
                    }
                }
 
                if( updateExclFromBOM )
                {
                    otherUnit->SetExcludedFromBOM( GetExcludedFromBOM( &aSourceSheet, aVariantName ), &sheet,
                                                   aVariantName );
                }
 
                if( updateExclFromBoard )
                {
                    otherUnit->SetExcludedFromBoard( GetExcludedFromBoard( &aSourceSheet, aVariantName ), &sheet,
                                                     aVariantName );
                }
 
                if( updateExclFromPosFiles )
                {
                    otherUnit->SetExcludedFromPosFiles( GetExcludedFromPosFiles( &aSourceSheet, aVariantName ), &sheet,
                                                        aVariantName );
                }
 
                if( updateDNP )
                    otherUnit->SetDNP( GetDNP( &aSourceSheet, aVariantName ), &sheet, aVariantName );
 
                if( updatePinMapOverride )
                    otherUnit->SetPinMapOverride( GetPinMapOverride( &aSourceSheet, aVariantName ), &sheet,
                                                  aVariantName );
 
                if( updatePins )
                {
                    for( const std::unique_ptr<SCH_PIN>& model_pin : m_pins )
                    {
                        for( SCH_PIN* src_pin : otherUnit->GetPinsByNumber( model_pin->GetNumber() ) )
                            src_pin->SetAlt( model_pin->GetAlt() );
                    }
                }
            }
        }
    }
}
 
 
void SCH_SYMBOL::RunOnChildren( const std::function<void( SCH_ITEM* )>& aFunction, RECURSE_MODE aMode )
{
    for( const std::unique_ptr<SCH_PIN>& pin : m_pins )
        aFunction( pin.get() );
 
    for( SCH_FIELD& field : m_fields )
        aFunction( &field );
}
 
 
void SCH_SYMBOL::ClearCaches()
{
    SCH_ITEM::ClearCaches();
    m_variantSymbolCache.clear();
}
 
 
SCH_PIN* SCH_SYMBOL::GetPin( const wxString& aNumber ) const
{
    for( const std::unique_ptr<SCH_PIN>& pin : m_pins )
    {
        if( pin->GetNumber() == aNumber )
            return pin.get();
    }
 
    return nullptr;
}
 
 
SCH_PIN* SCH_SYMBOL::GetPinByEffectivePadNumber( const wxString& aPadNumber, const SCH_SHEET_PATH* aSheet,
                                                 const wxString& aVariantName ) const
{
    if( !aSheet )
        return nullptr;
 
    for( const std::unique_ptr<SCH_PIN>& pin : m_pins )
    {
        for( const wxString& pad : ExpandStackedPinNotation( pin->GetEffectivePadNumber( *aSheet, aVariantName ) ) )
        {
            if( pad == aPadNumber )
                return pin.get();
        }
    }
 
    return nullptr;
}
 
 
std::vector<SCH_PIN*> SCH_SYMBOL::GetPinsByNumber( const wxString& aNumber ) const
{
    std::vector<SCH_PIN*> pins;
 
    for( const std::unique_ptr<SCH_PIN>& pin : m_pins )
    {
        if( pin->GetNumber() == aNumber )
            pins.push_back( pin.get() );
    }
 
    return pins;
}
 
 
const SCH_PIN* SCH_SYMBOL::GetPin( const VECTOR2I& aPos ) const
{
    for( const std::unique_ptr<SCH_PIN>& pin : m_pins )
    {
        int pin_unit = pin->GetLibPin() ? pin->GetLibPin()->GetUnit() : GetUnit();
        int pin_bodyStyle = pin->GetLibPin() ? pin->GetLibPin()->GetBodyStyle() : GetBodyStyle();
 
        if( pin_unit > 0 && pin_unit != GetUnit() )
            continue;
 
        if( pin_bodyStyle > 0 && pin_bodyStyle != GetBodyStyle() )
            continue;
 
        if( pin->GetPosition() == aPos )
            return pin.get();
    }
 
    return nullptr;
}
 
 
std::vector<SCH_PIN*> SCH_SYMBOL::GetLibPins() const
{
    if( m_part )
        return m_part->GetGraphicalPins( m_unit, m_bodyStyle );
 
    return std::vector<SCH_PIN*>();
}
 
 
std::vector<SCH_PIN*> SCH_SYMBOL::GetAllLibPins() const
{
    if( m_part )
        return m_part->GetPins();
 
    return std::vector<SCH_PIN*>();
}
 
 
size_t SCH_SYMBOL::GetFullPinCount() const
{
    return m_part ? m_part->GetPinCount() : 0;
}
 
 
SCH_PIN* SCH_SYMBOL::GetPin( SCH_PIN* aLibPin ) const
{
    auto it = m_pinMap.find( aLibPin );
 
    if( it != m_pinMap.end() )
        return it->second;
 
    wxFAIL_MSG_AT( "Pin not found", __FILE__, __LINE__, __FUNCTION__ );
    return nullptr;
}
 
 
std::vector<const SCH_PIN*> SCH_SYMBOL::GetPins( const SCH_SHEET_PATH* aSheet ) const
{
    std::vector<const SCH_PIN*> pins;
    int                         unit = m_unit;
 
    if( !aSheet && Schematic() )
        aSheet = &Schematic()->CurrentSheet();
 
    if( aSheet )
        unit = GetUnitSelection( aSheet );
 
    for( const std::unique_ptr<SCH_PIN>& pin : m_pins )
    {
        if( unit && pin->GetUnit() && pin->GetUnit() != unit )
            continue;
 
        pins.push_back( pin.get() );
    }
 
    return pins;
}
 
 
std::vector<SCH_PIN*> SCH_SYMBOL::GetPins( const SCH_SHEET_PATH* aSheet )
{
    std::vector<SCH_PIN*> pins;
    int                   unit = m_unit;
 
    if( !aSheet && Schematic() )
        aSheet = &Schematic()->CurrentSheet();
 
    if( aSheet )
        unit = GetUnitSelection( aSheet );
 
    for( const std::unique_ptr<SCH_PIN>& pin : m_pins )
    {
        if( unit && pin->GetUnit() && pin->GetUnit() != unit )
            continue;
 
        pins.push_back( pin.get() );
    }
 
    return pins;
}
 
 
std::vector<SCH_PIN*> SCH_SYMBOL::GetPins() const
{
    // Back-compat shim: return graphical pins for all units/body styles, violating const
    return const_cast<SCH_SYMBOL*>( this )->GetPins( nullptr );
}
 
 
void SCH_SYMBOL::swapData( SCH_ITEM* aItem )
{
    wxCHECK_RET( aItem != nullptr && aItem->Type() == SCH_SYMBOL_T, wxT( "Cannot swap data with invalid symbol." ) );
 
    SCH_SYMBOL* symbol = static_cast<SCH_SYMBOL*>( aItem );
 
    std::swap( m_lib_id, symbol->m_lib_id );
 
    m_pins.swap( symbol->m_pins ); // std::vector's swap()
 
    for( std::unique_ptr<SCH_PIN>& pin : symbol->m_pins )
        pin->SetParent( symbol );
 
    for( std::unique_ptr<SCH_PIN>& pin : m_pins )
        pin->SetParent( this );
 
    LIB_SYMBOL* libSymbol = symbol->m_part.release();
    symbol->m_part = std::move( m_part );
    symbol->UpdatePins();
    m_part.reset( libSymbol );
    UpdatePins();
 
    std::swap( m_pos, symbol->m_pos );
 
    m_fields.swap( symbol->m_fields ); // std::vector's swap()
 
    for( SCH_FIELD& field : symbol->m_fields )
        field.SetParent( symbol );
 
    for( SCH_FIELD& field : m_fields )
        field.SetParent( this );
 
    TRANSFORM tmp = m_transform;
 
    m_transform = symbol->m_transform;
    symbol->m_transform = tmp;
 
    std::swap( m_excludedFromSim, symbol->m_excludedFromSim );
    std::swap( m_excludedFromBOM, symbol->m_excludedFromBOM );
    std::swap( m_DNP, symbol->m_DNP );
    std::swap( m_excludedFromBoard, symbol->m_excludedFromBoard );
    std::swap( m_excludedFromPosFiles, symbol->m_excludedFromPosFiles );
    std::swap( m_pinMapOverride, symbol->m_pinMapOverride );
 
    std::swap( m_instances, symbol->m_instances );
    std::swap( m_instancePathIndex, symbol->m_instancePathIndex );
    std::swap( m_schLibSymbolName, symbol->m_schLibSymbolName );
 
    m_variantSymbolCache.clear();
    symbol->m_variantSymbolCache.clear();
}
 
 
void SCH_SYMBOL::GetContextualTextVars( wxArrayString* aVars ) const
{
    for( const SCH_FIELD& field : m_fields )
    {
        if( field.IsPrivate() )
            continue;
 
        if( field.IsMandatory() )
            aVars->push_back( field.GetCanonicalName().Upper() );
        else
            aVars->push_back( field.GetName() );
    }
 
    aVars->push_back( wxT( "OP" ) );
    aVars->push_back( wxT( "FOOTPRINT_LIBRARY" ) );
    aVars->push_back( wxT( "FOOTPRINT_NAME" ) );
    aVars->push_back( wxT( "UNIT" ) );
    aVars->push_back( wxT( "SHORT_REFERENCE" ) );
    aVars->push_back( wxT( "SYMBOL_LIBRARY" ) );
    aVars->push_back( wxT( "SYMBOL_NAME" ) );
    aVars->push_back( wxT( "SYMBOL_DESCRIPTION" ) );
    aVars->push_back( wxT( "SYMBOL_KEYWORDS" ) );
    aVars->push_back( wxT( "EXCLUDE_FROM_BOM" ) );
    aVars->push_back( wxT( "EXCLUDE_FROM_BOARD" ) );
    aVars->push_back( wxT( "EXCLUDE_FROM_SIM" ) );
    aVars->push_back( wxT( "DNP" ) );
    aVars->push_back( wxT( "SHORT_NET_NAME(<pin_number>)" ) );
    aVars->push_back( wxT( "NET_NAME(<pin_number>)" ) );
    aVars->push_back( wxT( "NET_CLASS(<pin_number>)" ) );
    aVars->push_back( wxT( "PIN_NAME(<pin_number>)" ) );
    aVars->push_back( wxT( "REFERENCE(<pin_number>)" ) );
    aVars->push_back( wxT( "SHORT_REFERENCE(<pin_number>)" ) );
    aVars->push_back( wxT( "UNIT(<pin_number>)" ) );
}
 
 
bool SCH_SYMBOL::ResolveTextVar( const SCH_SHEET_PATH* aPath, wxString* token, int aDepth ) const
{
    return ResolveTextVar( aPath, token, wxEmptyString, aDepth );
}
 
 
bool SCH_SYMBOL::ResolveTextVar( const SCH_SHEET_PATH* aPath, wxString* token,
                                 const wxString& aVariantName, int aDepth ) const
{
    // Per-thread regex.  CONNECTION_GRAPH::resolveAllDrivers calls this from worker
    // threads, and wxRegEx::Matches is not safe to call concurrently on one instance.
    thread_local wxRegEx operatingPoint( wxT( "^"
                                              "OP"
                                              "(:[^.]*)?"     // pin
                                              "(.([0-9])?"    // precisionStr
                                              "([a-zA-Z]*))?" // rangeStr
                                              "$" ) );
 
    if( !aPath )
        return false;
 
    SCHEMATIC* schematic = Schematic();
 
    if( !schematic )
        return false;
 
    wxString variant = aVariantName.IsEmpty() ? schematic->GetCurrentVariant() : aVariantName;
 
    if( operatingPoint.Matches( *token ) )
    {
        wxString pin( operatingPoint.GetMatch( *token, 1 ).Lower() );
        wxString precisionStr( operatingPoint.GetMatch( *token, 3 ) );
        wxString rangeStr( operatingPoint.GetMatch( *token, 4 ) );
 
        int      precision = precisionStr.IsEmpty() ? 3 : precisionStr[0] - '0';
        wxString range = rangeStr.IsEmpty() ? wxString( wxS( "~A" ) ) : rangeStr;
 
        SIM_LIB_MGR simLibMgr( &schematic->Project() );
 
        std::vector<EMBEDDED_FILES*> embeddedFilesStack;
        embeddedFilesStack.push_back( schematic->GetEmbeddedFiles() );
 
        if( m_part )
            embeddedFilesStack.push_back( m_part->GetEmbeddedFiles() );
 
        simLibMgr.SetFilesStack( std::move( embeddedFilesStack ) );
 
        NULL_REPORTER devnull;
        SIM_MODEL&    model = simLibMgr.CreateModel( aPath, const_cast<SCH_SYMBOL&>( *this ), true, aDepth + 1,
                                                     aVariantName, devnull ).model;
        SPICE_ITEM spiceItem;
        spiceItem.refName = GetRef( aPath );
 
        wxString spiceRef = model.SpiceGenerator().ItemName( spiceItem );
        spiceRef = spiceRef.Lower();
 
        if( pin.IsEmpty() )
        {
            *token = schematic->GetOperatingPoint( spiceRef, precision, range );
            return true;
        }
        else if( pin == wxS( ":power" ) )
        {
            if( rangeStr.IsEmpty() )
                range = wxS( "~W" );
 
            *token = schematic->GetOperatingPoint( spiceRef + wxS( ":power" ), precision, range );
            return true;
        }
        else
        {
            pin = pin.SubString( 1, -1 ); // Strip ':' from front
 
            for( const std::reference_wrapper<const SIM_MODEL_PIN>& modelPin : model.GetPins() )
            {
                SCH_PIN* symbolPin = GetPin( modelPin.get().symbolPinNumber );
 
                if( pin == symbolPin->GetName().Lower() || pin == symbolPin->GetNumber().Lower() )
                {
                    if( model.GetPins().size() == 2 )
                    {
                        *token = schematic->GetOperatingPoint( spiceRef, precision, range );
                    }
                    else
                    {
                        wxString netChainName = spiceRef + wxS( ":" ) + modelPin.get().modelPinName;
                        *token = schematic->GetOperatingPoint( netChainName, precision, range );
                    }
 
                    return true;
                }
            }
        }
 
        *token = wxS( "?" );
        return true;
    }
 
    if( token->Contains( ':' ) )
    {
        if( schematic->ResolveCrossReference( token, aDepth + 1 ) )
            return true;
    }
 
    for( const SCH_FIELD& field : m_fields )
    {
        wxString fieldName = field.IsMandatory() ? field.GetCanonicalName() : field.GetName();
 
        wxString textToken = field.GetText();
        textToken.Replace( " ", wxEmptyString );
        wxString tokenString = "${" + fieldName + "}";
 
        // If the field data is just a reference to the field, don't resolve
        if( textToken.IsSameAs( tokenString, false ) )
            return true;
 
        if( token->IsSameAs( fieldName, false ) )
        {
            if( field.GetId() == FIELD_T::REFERENCE )
            {
                *token = GetRef( aPath, true );
            }
            else if( !aVariantName.IsEmpty() )
            {
                // Check for variant-specific field value
                std::optional<SCH_SYMBOL_VARIANT> symVariant = GetVariant( *aPath, aVariantName );
 
                if( symVariant && symVariant->m_Fields.contains( fieldName ) )
                    *token = symVariant->m_Fields.at( fieldName );
                else
                    *token = field.GetShownText( aPath, false, aDepth + 1 );
            }
            else
            {
                *token = field.GetShownText( aPath, false, aDepth + 1 );
            }
 
            return true;
        }
    }
 
    // Consider missing simulation fields as empty, not un-resolved
    if( token->IsSameAs( wxT( "SIM.DEVICE" ) ) || token->IsSameAs( wxT( "SIM.TYPE" ) )
        || token->IsSameAs( wxT( "SIM.PINS" ) ) || token->IsSameAs( wxT( "SIM.PARAMS" ) )
        || token->IsSameAs( wxT( "SIM.LIBRARY" ) ) || token->IsSameAs( wxT( "SIM.NAME" ) ) )
    {
        *token = wxEmptyString;
        return true;
    }
 
    for( const TEMPLATE_FIELDNAME& templateFieldname :
         schematic->Settings().m_TemplateFieldNames.GetTemplateFieldNames() )
    {
        if( token->IsSameAs( templateFieldname.m_Name ) || token->IsSameAs( templateFieldname.m_Name.Upper() ) )
        {
            // If we didn't find it in the fields list then it isn't set on this symbol.
            // Just return an empty string.
            *token = wxEmptyString;
            return true;
        }
    }
 
    if( token->IsSameAs( wxT( "FOOTPRINT_LIBRARY" ) ) )
    {
        wxString footprint = GetFootprintFieldText( true, aPath, false );
 
        wxArrayString parts = wxSplit( footprint, ':' );
 
        if( parts.Count() > 0 )
            *token = parts[0];
        else
            *token = wxEmptyString;
 
        return true;
    }
    else if( token->IsSameAs( wxT( "FOOTPRINT_NAME" ) ) )
    {
        wxString footprint = GetFootprintFieldText( true, aPath, false );
 
        wxArrayString parts = wxSplit( footprint, ':' );
 
        if( parts.Count() > 1 )
            *token = parts[std::min( 1, (int) parts.size() - 1 )];
        else
            *token = wxEmptyString;
 
        return true;
    }
    else if( token->IsSameAs( wxT( "UNIT" ) ) )
    {
        *token = SubReference( GetUnitSelection( aPath ) );
        return true;
    }
    else if( token->IsSameAs( wxT( "SHORT_REFERENCE" ) ) )
    {
        *token = GetRef( aPath, false );
        return true;
    }
    else if( token->IsSameAs( wxT( "SYMBOL_LIBRARY" ) ) )
    {
        *token = m_lib_id.GetUniStringLibNickname();
        return true;
    }
    else if( token->IsSameAs( wxT( "SYMBOL_NAME" ) ) )
    {
        *token = m_lib_id.GetUniStringLibItemName();
        return true;
    }
    else if( token->IsSameAs( wxT( "SYMBOL_DESCRIPTION" ) ) )
    {
        *token = GetShownDescription( aDepth + 1 );
        return true;
    }
    else if( token->IsSameAs( wxT( "SYMBOL_KEYWORDS" ) ) )
    {
        *token = GetShownKeyWords( aDepth + 1 );
        return true;
    }
    else if( token->IsSameAs( wxT( "EXCLUDE_FROM_BOM" ) ) )
    {
        *token = wxEmptyString;
 
        if( aPath->GetExcludedFromBOM( variant ) || this->ResolveExcludedFromBOM( aPath, variant ) )
            *token = _( "Excluded from BOM" );
 
        return true;
    }
    else if( token->IsSameAs( wxT( "EXCLUDE_FROM_BOARD" ) ) )
    {
        *token = wxEmptyString;
 
        if( aPath->GetExcludedFromBoard( variant ) || this->ResolveExcludedFromBoard( aPath, variant ) )
            *token = _( "Excluded from board" );
 
        return true;
    }
    else if( token->IsSameAs( wxT( "EXCLUDE_FROM_SIM" ) ) )
    {
        *token = wxEmptyString;
 
        if( aPath->GetExcludedFromSim( variant ) || this->ResolveExcludedFromSim( aPath, variant ) )
            *token = _( "Excluded from simulation" );
 
        return true;
    }
    else if( token->IsSameAs( wxT( "DNP" ) ) )
    {
        *token = wxEmptyString;
 
        if( aPath->GetDNP( variant ) || this->ResolveDNP( aPath, variant ) )
            *token = _( "DNP" );
 
        return true;
    }
    else if( token->StartsWith( wxT( "SHORT_NET_NAME(" ) ) || token->StartsWith( wxT( "NET_NAME(" ) )
             || token->StartsWith( wxT( "NET_CLASS(" ) ) || token->StartsWith( wxT( "PIN_NAME(" ) )
             || token->StartsWith( wxT( "PIN_BASE_NAME(" ) ) || token->StartsWith( wxT( "PIN_ALT_LIST(" ) )
             || token->StartsWith( wxT( "REFERENCE(" ) ) || token->StartsWith( wxT( "SHORT_REFERENCE(" ) )
             || token->StartsWith( wxT( "UNIT(" ) ) )
    {
        wxString pinNumber = token->AfterFirst( '(' );
        pinNumber = pinNumber.BeforeLast( ')' );
 
        bool isReferenceFunction = token->StartsWith( wxT( "REFERENCE(" ) );
        bool isShortReferenceFunction = token->StartsWith( wxT( "SHORT_REFERENCE(" ) );
        bool isUnitFunction = token->StartsWith( wxT( "UNIT(" ) );
 
        // First, try to find the pin in the current unit (for backward compatibility)
        // For REFERENCE/SHORT_REFERENCE/UNIT functions, always search all pins to find which unit the pin belongs to
        std::vector<const SCH_PIN*> pinsToSearch;
        std::vector<const SCH_PIN*> altPinsToSearch;
 
        if( isReferenceFunction || isShortReferenceFunction || isUnitFunction )
        {
            for( SCH_PIN* pin : GetAllLibPins() )
                pinsToSearch.push_back( pin );
        }
        else
        {
            for( const SCH_PIN* pin : GetPins( aPath ) )
                pinsToSearch.push_back( pin );
 
            for( SCH_PIN* pin : GetAllLibPins() )
                altPinsToSearch.push_back( pin );
        }
 
        for( const SCH_PIN* pin : pinsToSearch )
        {
            if( pin->GetNumber() == pinNumber )
            {
                if( isReferenceFunction || isShortReferenceFunction || isUnitFunction )
                {
                    int      pinUnit = pin->GetUnit();
                    wxString result;
 
                    if( isReferenceFunction )
                    {
                        // Return the full unit reference (e.g., "J601A")
                        if( pinUnit > 0 )
                            result = GetRef( aPath, false ) + SubReference( pinUnit, false );
                        else
                            result = GetRef( aPath, false );
                    }
                    else if( isShortReferenceFunction )
                    {
                        // Return the reference without unit (e.g., "J601")
                        result = GetRef( aPath, false );
                    }
                    else if( isUnitFunction )
                    {
                        // Return only the unit letter (e.g., "A")
                        if( pinUnit > 0 )
                            result = SubReference( pinUnit, false );
                        else
                            result = wxEmptyString;
                    }
 
                    *token = std::move( result );
                    return true;
                }
                else if( token->StartsWith( wxT( "PIN_NAME" ) ) )
                {
                    *token = pin->GetAlt().IsEmpty() ? pin->GetName() : pin->GetAlt();
                    return true;
                }
                else if( token->StartsWith( wxT( "PIN_BASE_NAME" ) ) )
                {
                    *token = pin->GetBaseName();
                    return true;
                }
                else if( token->StartsWith( wxT( "PIN_ALT_LIST" ) ) )
                {
                    // Build list of alternate names only (no base name)
                    wxString altList;
 
                    const std::map<wxString, SCH_PIN::ALT>& alts = pin->GetAlternates();
 
                    for( const auto& [altName, altDef] : alts )
                    {
                        if( !altList.IsEmpty() )
                            altList += wxT( ", " );
 
                        altList += altName;
                    }
 
                    *token = std::move( altList );
                    return true;
                }
 
                SCH_CONNECTION* conn = pin->Connection( aPath );
 
                if( !conn )
                {
                    *token = wxEmptyString;
                }
                else if( token->StartsWith( wxT( "SHORT_NET_NAME" ) ) )
                {
                    wxString netName = conn->LocalName();
 
                    if( netName.Lower().StartsWith( wxT( "unconnected" ) ) )
                        *token = wxT( "NC" );
                    else
                        *token = std::move( netName );
                }
                else if( token->StartsWith( wxT( "NET_NAME" ) ) )
                {
                    *token = conn->Name();
                }
                else if( token->StartsWith( wxT( "NET_CLASS" ) ) )
                {
                    *token = pin->GetEffectiveNetClass( aPath )->GetName();
                }
 
                return true;
            }
        }
 
        // If pin not found in current unit, search all units (auto-resolution)
        for( const SCH_PIN* pin : altPinsToSearch )
        {
            if( pin->GetNumber() == pinNumber )
            {
                // For PIN_BASE_NAME and PIN_ALT_LIST, we can use library data
                if( token->StartsWith( wxT( "PIN_BASE_NAME" ) ) )
                {
                    *token = pin->GetBaseName();
                    return true;
                }
                else if( token->StartsWith( wxT( "PIN_ALT_LIST" ) ) )
                {
                    // Build list of alternate names only (no base name)
                    wxString altList;
 
                    const std::map<wxString, SCH_PIN::ALT>& alts = pin->GetAlternates();
 
                    for( const auto& [altName, altDef] : alts )
                    {
                        if( !altList.IsEmpty() )
                            altList += wxT( ", " );
                        altList += altName;
                    }
 
                    *token = altList;
                    return true;
                }
 
                // For net-related functions, find which sheet path has this pin's unit
                int pinUnit = pin->GetUnit();
 
                // Search all sheets for a symbol with our reference and the correct unit
                // This is needed because each unit of a multi-unit symbol is a separate object
                SCH_SHEET_PATH targetPath;
                SCH_SYMBOL*    targetSymbol = nullptr;
 
                if( Schematic() )
                {
                    for( const SCH_SHEET_PATH& sheetPath : Schematic()->Hierarchy() )
                    {
                        for( SCH_ITEM* item : sheetPath.LastScreen()->Items().OfType( SCH_SYMBOL_T ) )
                        {
                            SCH_SYMBOL* symbol = static_cast<SCH_SYMBOL*>( item );
 
                            // Check if this symbol has the same reference designator and the correct unit
                            if( symbol->GetRef( &sheetPath, false ) == GetRef( aPath, false )
                                && symbol->GetUnitSelection( &sheetPath ) == pinUnit )
                            {
                                targetPath = sheetPath; // Copy the sheet path
                                targetSymbol = symbol;
                                break;
                            }
                        }
 
                        if( targetSymbol )
                            break;
                    }
                }
 
                if( !targetSymbol )
                {
                    // Unit not placed on any sheet
                    *token = wxString::Format( wxT( "<Unit %s not placed>" ), SubReference( pinUnit, false ) );
                    return true;
                }
 
                // Get the pin from the actual instance symbol we found
                // Match by pin number, not by pointer, since the library pins are different objects
                SCH_PIN* instancePin = nullptr;
 
                for( SCH_PIN* candidate : targetSymbol->GetPins( &targetPath ) )
                {
                    if( candidate->GetNumber() == pinNumber )
                    {
                        instancePin = candidate;
                        break;
                    }
                }
 
                if( !instancePin )
                {
                    *token = wxEmptyString;
                    return true;
                }
 
                // PIN_NAME doesn't need connection data, just instance pin
                if( token->StartsWith( wxT( "PIN_NAME" ) ) )
                {
                    *token = instancePin->GetAlt().IsEmpty() ? instancePin->GetName() : instancePin->GetAlt();
                    return true;
                }
 
                // Now get the connection from the correct sheet path
                SCH_CONNECTION* conn = instancePin->Connection( &targetPath );
 
                if( !conn )
                {
                    *token = wxEmptyString;
                }
                else if( token->StartsWith( wxT( "SHORT_NET_NAME" ) ) )
                {
                    wxString netName = conn->LocalName();
                    if( netName.Lower().StartsWith( wxT( "unconnected" ) ) )
                        *token = wxT( "NC" );
                    else
                        *token = netName;
                }
                else if( token->StartsWith( wxT( "NET_NAME" ) ) )
                {
                    *token = conn->Name();
                }
                else if( token->StartsWith( wxT( "NET_CLASS" ) ) )
                {
                    *token = instancePin->GetEffectiveNetClass( &targetPath )->GetName();
                }
 
                return true;
            }
        }
 
        // If we got here, no pin was found - report unresolved
        *token = wxString::Format( wxT( "<Unresolved: pin %s>" ), pinNumber );
        return true;
    }
 
    // See if parent can resolve it (this will recurse to ancestors)
    if( aPath->Last() && aPath->Last()->ResolveTextVar( aPath, token, aDepth + 1 ) )
        return true;
 
    return false;
}
 
 
void SCH_SYMBOL::ClearAnnotation( const SCH_SHEET_PATH* aSheetPath, bool aResetPrefix )
{
    if( aSheetPath )
    {
        KIID_PATH path = aSheetPath->Path();
 
        for( SCH_SYMBOL_INSTANCE& instance : m_instances )
        {
            if( instance.m_Path == path )
            {
                if( instance.m_Reference.IsEmpty() || aResetPrefix )
                    instance.m_Reference = UTIL::GetRefDesUnannotated( m_prefix );
                else
                    instance.m_Reference = UTIL::GetRefDesUnannotated( instance.m_Reference );
            }
        }
    }
    else
    {
        for( SCH_SYMBOL_INSTANCE& instance : m_instances )
        {
            if( instance.m_Reference.IsEmpty() || aResetPrefix )
                instance.m_Reference = UTIL::GetRefDesUnannotated( m_prefix );
            else
                instance.m_Reference = UTIL::GetRefDesUnannotated( instance.m_Reference );
        }
    }
 
    for( std::unique_ptr<SCH_PIN>& pin : m_pins )
        pin->ClearDefaultNetName( aSheetPath );
 
    // Only modify the REFERENCE field text when clearing ALL annotations (aSheetPath is NULL).
    // When clearing for a specific sheet path, we must preserve the field text because it serves
    // as a fallback for GetRef() when instances for other sheet paths are looked up.
    // See issue #20173: modifying field text here corrupts references in shared screens.
    if( !aSheetPath )
    {
        wxString currentReference = GetField( FIELD_T::REFERENCE )->GetText();
 
        if( currentReference.IsEmpty() || aResetPrefix )
            GetField( FIELD_T::REFERENCE )->SetText( UTIL::GetRefDesUnannotated( m_prefix ) );
        else
            GetField( FIELD_T::REFERENCE )->SetText( UTIL::GetRefDesUnannotated( currentReference ) );
    }
}
 
 
bool SCH_SYMBOL::AddSheetPathReferenceEntryIfMissing( const KIID_PATH& aSheetPath )
{
    // An empty sheet path is illegal, at a minimum the root sheet UUID must be present.
    wxCHECK( aSheetPath.size() > 0, false );
 
    for( const SCH_SYMBOL_INSTANCE& instance : m_instances )
    {
        // if aSheetPath is found, nothing to do:
        if( instance.m_Path == aSheetPath )
            return false;
    }
 
    // This entry does not exist: add it, with its last-used reference
    AddHierarchicalReference( aSheetPath, GetField( FIELD_T::REFERENCE )->GetText(), m_unit );
    return true;
}
 
 
void SCH_SYMBOL::SetOrientation( int aOrientation )
{
    TRANSFORM temp = TRANSFORM();
    bool      transform = false;
 
    switch( aOrientation )
    {
    case SYM_ORIENT_0:
    case SYM_NORMAL: // default transform matrix
        m_transform = TRANSFORM();
        break;
 
    case SYM_ROTATE_COUNTERCLOCKWISE: // Rotate + (incremental rotation)
        temp.x1 = 0;
        temp.y1 = 1;
        temp.x2 = -1;
        temp.y2 = 0;
        transform = true;
        break;
 
    case SYM_ROTATE_CLOCKWISE: // Rotate - (incremental rotation)
        temp.x1 = 0;
        temp.y1 = -1;
        temp.x2 = 1;
        temp.y2 = 0;
        transform = true;
        break;
 
    case SYM_MIRROR_Y: // Mirror Y (incremental transform)
        temp.x1 = -1;
        temp.y1 = 0;
        temp.x2 = 0;
        temp.y2 = 1;
        transform = true;
        break;
 
    case SYM_MIRROR_X: // Mirror X (incremental transform)
        temp.x1 = 1;
        temp.y1 = 0;
        temp.x2 = 0;
        temp.y2 = -1;
        transform = true;
        break;
 
    case SYM_ORIENT_90:
        SetOrientation( SYM_ORIENT_0 );
        SetOrientation( SYM_ROTATE_COUNTERCLOCKWISE );
        break;
 
    case SYM_ORIENT_180:
        SetOrientation( SYM_ORIENT_0 );
        SetOrientation( SYM_ROTATE_COUNTERCLOCKWISE );
        SetOrientation( SYM_ROTATE_COUNTERCLOCKWISE );
        break;
 
    case SYM_ORIENT_270:
        SetOrientation( SYM_ORIENT_0 );
        SetOrientation( SYM_ROTATE_CLOCKWISE );
        break;
 
    case( SYM_ORIENT_0 + SYM_MIRROR_X ):
        SetOrientation( SYM_ORIENT_0 );
        SetOrientation( SYM_MIRROR_X );
        break;
 
    case( SYM_ORIENT_0 + SYM_MIRROR_Y ):
        SetOrientation( SYM_ORIENT_0 );
        SetOrientation( SYM_MIRROR_Y );
        break;
 
    case( SYM_ORIENT_0 + SYM_MIRROR_X + SYM_MIRROR_Y ):
        SetOrientation( SYM_ORIENT_0 );
        SetOrientation( SYM_MIRROR_X );
        SetOrientation( SYM_MIRROR_Y );
        break;
 
    case( SYM_ORIENT_90 + SYM_MIRROR_X ):
        SetOrientation( SYM_ORIENT_90 );
        SetOrientation( SYM_MIRROR_X );
        break;
 
    case( SYM_ORIENT_90 + SYM_MIRROR_Y ):
        SetOrientation( SYM_ORIENT_90 );
        SetOrientation( SYM_MIRROR_Y );
        break;
 
    case( SYM_ORIENT_90 + SYM_MIRROR_X + SYM_MIRROR_Y ):
        SetOrientation( SYM_ORIENT_90 );
        SetOrientation( SYM_MIRROR_X );
        SetOrientation( SYM_MIRROR_Y );
        break;
 
    case( SYM_ORIENT_180 + SYM_MIRROR_X ):
        SetOrientation( SYM_ORIENT_180 );
        SetOrientation( SYM_MIRROR_X );
        break;
 
    case( SYM_ORIENT_180 + SYM_MIRROR_Y ):
        SetOrientation( SYM_ORIENT_180 );
        SetOrientation( SYM_MIRROR_Y );
        break;
 
    case( SYM_ORIENT_180 + SYM_MIRROR_X + SYM_MIRROR_Y ):
        SetOrientation( SYM_ORIENT_180 );
        SetOrientation( SYM_MIRROR_X );
        SetOrientation( SYM_MIRROR_Y );
        break;
 
    case( SYM_ORIENT_270 + SYM_MIRROR_X ):
        SetOrientation( SYM_ORIENT_270 );
        SetOrientation( SYM_MIRROR_X );
        break;
 
    case( SYM_ORIENT_270 + SYM_MIRROR_Y ):
        SetOrientation( SYM_ORIENT_270 );
        SetOrientation( SYM_MIRROR_Y );
        break;
 
    case( SYM_ORIENT_270 + SYM_MIRROR_X + SYM_MIRROR_Y ):
        SetOrientation( SYM_ORIENT_270 );
        SetOrientation( SYM_MIRROR_X );
        SetOrientation( SYM_MIRROR_Y );
        break;
 
    default:
        transform = false;
        wxFAIL_MSG( "Invalid schematic symbol orientation type." );
        break;
    }
 
    if( transform )
    {
        /* The new matrix transform is the old matrix transform modified by the
         *  requested transformation, which is the temp transform (rot,
         *  mirror ..) in order to have (in term of matrix transform):
         *     transform coord = new_m_transform * coord
         *  where transform coord is the coord modified by new_m_transform from
         *  the initial value coord.
         *  new_m_transform is computed (from old_m_transform and temp) to
         *  have:
         *     transform coord = old_m_transform * temp
         */
        TRANSFORM newTransform;
 
        newTransform.x1 = m_transform.x1 * temp.x1 + m_transform.x2 * temp.y1;
        newTransform.y1 = m_transform.y1 * temp.x1 + m_transform.y2 * temp.y1;
        newTransform.x2 = m_transform.x1 * temp.x2 + m_transform.x2 * temp.y2;
        newTransform.y2 = m_transform.y1 * temp.x2 + m_transform.y2 * temp.y2;
        m_transform = newTransform;
    }
}
 
 
int SCH_SYMBOL::GetOrientation() const
{
    /*
     * This is slow, but also a bizarre algorithm.  I don't feel like unteasing the algorithm right
     * now, so let's just cache it for the moment.
     */
    if( s_transformToOrientationCache.count( m_transform ) )
        return s_transformToOrientationCache.at( m_transform );
 
    int rotate_values[] = { SYM_ORIENT_0,
                            SYM_ORIENT_90,
                            SYM_ORIENT_180,
                            SYM_ORIENT_270,
                            SYM_MIRROR_X + SYM_ORIENT_0,
                            SYM_MIRROR_X + SYM_ORIENT_90,
                            SYM_MIRROR_X + SYM_ORIENT_270,
                            SYM_MIRROR_Y,
                            SYM_MIRROR_Y + SYM_ORIENT_0,
                            SYM_MIRROR_Y + SYM_ORIENT_90,
                            SYM_MIRROR_Y + SYM_ORIENT_180,
                            SYM_MIRROR_Y + SYM_ORIENT_270 };
 
    // Try to find the current transform option:
    TRANSFORM  transform = m_transform;
    SCH_SYMBOL temp( *this );
    temp.SetParentGroup( nullptr );
 
    for( int type_rotate : rotate_values )
    {
        temp.SetOrientation( type_rotate );
 
        if( transform == temp.GetTransform() )
        {
            s_transformToOrientationCache[m_transform] = type_rotate;
            return type_rotate;
        }
    }
 
    // Error: orientation not found in list (should not happen)
    wxFAIL_MSG( "Schematic symbol orientation matrix internal error." );
 
    return SYM_NORMAL;
}
 
 
#if defined( DEBUG )
 
void SCH_SYMBOL::Show( int nestLevel, std::ostream& os ) const
{
    // for now, make it look like XML:
    NestedSpace( nestLevel, os ) << '<' << GetClass().Lower().mb_str() << " ref=\""
                                 << TO_UTF8( GetField( FIELD_T::REFERENCE )->GetName() ) << '"' << " chipName=\""
                                 << GetLibId().Format().wx_str() << '"' << m_pos << " layer=\"" << m_layer << '"'
                                 << ">\n";
 
    // skip the reference, it's been output already.
    for( int i = 1; i < (int) GetFields().size(); ++i )
    {
        const wxString& value = GetFields()[i].GetText();
 
        if( !value.IsEmpty() )
        {
            NestedSpace( nestLevel + 1, os ) << "<field" << " name=\"" << TO_UTF8( GetFields()[i].GetName() ) << '"'
                                             << " value=\"" << TO_UTF8( value ) << "\"/>\n";
        }
    }
 
    NestedSpace( nestLevel, os ) << "</" << TO_UTF8( GetClass().Lower() ) << ">\n";
}
 
#endif
 
 
BOX2I SCH_SYMBOL::doGetBoundingBox( bool aIncludePins, bool aIncludeFields ) const
{
    BOX2I bBox;
    const SCH_SHEET_PATH* sheetPath = Schematic() ? &Schematic()->CurrentSheet() : nullptr;
    const LIB_SYMBOL* effSym = GetEffectiveLibSymbol( sheetPath );
 
    if( effSym )
        bBox = effSym->GetBodyBoundingBox( m_unit, m_bodyStyle, aIncludePins, false );
    else
        bBox = LIB_SYMBOL::GetDummy()->GetBodyBoundingBox( m_unit, m_bodyStyle, aIncludePins, false );
 
    bBox = m_transform.TransformCoordinate( bBox );
    bBox.Normalize();
 
    bBox.Offset( m_pos );
 
    if( aIncludeFields )
    {
        for( const SCH_FIELD& field : m_fields )
        {
            if( field.IsVisible() )
                bBox.Merge( field.GetBoundingBox() );
        }
    }
 
    return bBox;
}
 
 
BOX2I SCH_SYMBOL::GetBodyBoundingBox() const
{
    try
    {
        return doGetBoundingBox( false, false );
    }
    catch( const boost::bad_pointer& e )
    {
        wxFAIL_MSG( wxString::Format( wxT( "Boost pointer exception occurred: %s" ), e.what() ) );
        return BOX2I();
    }
}
 
 
BOX2I SCH_SYMBOL::GetBodyAndPinsBoundingBox() const
{
    return doGetBoundingBox( true, false );
}
 
 
const BOX2I SCH_SYMBOL::GetBoundingBox() const
{
    return doGetBoundingBox( true, true );
}
 
 
void SCH_SYMBOL::GetMsgPanelInfo( EDA_DRAW_FRAME* aFrame, std::vector<MSG_PANEL_ITEM>& aList )
{
    wxString msg;
 
    SCH_EDIT_FRAME* schframe = dynamic_cast<SCH_EDIT_FRAME*>( aFrame );
    SCH_SHEET_PATH* currentSheet = schframe ? &schframe->GetCurrentSheet() : nullptr;
    wxString        currentVariant = Schematic() ? Schematic()->GetCurrentVariant() : wxString();
 
    auto addExcludes = [&]()
    {
        wxArrayString msgs;
 
        if( GetExcludedFromSim() )
            msgs.Add( _( "Simulation" ) );
 
        if( GetExcludedFromBOM() )
            msgs.Add( _( "BOM" ) );
 
        if( GetExcludedFromBoard() )
            msgs.Add( _( "Board" ) );
 
        if( GetDNP( currentSheet, currentVariant ) )
            msgs.Add( _( "DNP" ) );
 
        msg = wxJoin( msgs, '|' );
        msg.Replace( '|', wxS( ", " ) );
 
        if( !msg.empty() )
            aList.emplace_back( _( "Exclude from" ), msg );
    };
 
    // part and alias can differ if alias is not the root
    if( m_part )
    {
        if( m_part.get() != LIB_SYMBOL::GetDummy() )
        {
            if( m_part->IsPower() )
            {
                // Don't use GetShownText(); we want to see the variable references here
                aList.emplace_back( _( "Power symbol" ),
                                    KIUI::EllipsizeStatusText( aFrame, GetField( FIELD_T::VALUE )->GetText() ) );
            }
            else
            {
                aList.emplace_back( _( "Reference" ), UnescapeString( GetRef( currentSheet ) ) );
 
                // Don't use GetShownText(); we want to see the variable references here
                aList.emplace_back( _( "Value" ),
                                    KIUI::EllipsizeStatusText( aFrame, GetField( FIELD_T::VALUE )->GetText() ) );
                addExcludes();
                aList.emplace_back( _( "Name" ), KIUI::EllipsizeStatusText( aFrame, GetLibId().GetLibItemName() ) );
            }
 
#if 0 // Display symbol flags, for debug only
            aList.emplace_back( _( "flags" ), wxString::Format( "%X", GetEditFlags() ) );
#endif
 
            if( !m_part->IsRoot() )
            {
                msg = _( "Missing parent" );
 
                std::shared_ptr<LIB_SYMBOL> parent = m_part->GetParent().lock();
 
                if( parent )
                    msg = parent->GetName();
 
                aList.emplace_back( _( "Derived from" ), UnescapeString( msg ) );
            }
            else if( !m_lib_id.GetLibNickname().empty() )
            {
                aList.emplace_back( _( "Library" ), m_lib_id.GetLibNickname() );
            }
            else
            {
                aList.emplace_back( _( "Library" ), _( "Undefined!!!" ) );
            }
 
            // Display the current associated footprint, if exists.
            // Don't use GetShownText(); we want to see the variable references here
            msg = KIUI::EllipsizeStatusText( aFrame, GetField( FIELD_T::FOOTPRINT )->GetText() );
 
            if( msg.IsEmpty() )
                msg = _( "<Unknown>" );
 
            aList.emplace_back( _( "Footprint" ), msg );
 
            // Display description of the symbol, and keywords found in lib
            aList.emplace_back( _( "Description" ) + wxT( ": " ) + GetField( FIELD_T::DESCRIPTION )->GetText(),
                                _( "Keywords" ) + wxT( ": " ) + m_part->GetKeyWords() );
        }
    }
    else
    {
        aList.emplace_back( _( "Reference" ), GetRef( currentSheet ) );
 
        // Don't use GetShownText(); we want to see the variable references here
        aList.emplace_back( _( "Value" ), KIUI::EllipsizeStatusText( aFrame, GetField( FIELD_T::VALUE )->GetText() ) );
        addExcludes();
        aList.emplace_back( _( "Name" ), KIUI::EllipsizeStatusText( aFrame, GetLibId().GetLibItemName() ) );
 
        wxString libNickname = GetLibId().GetLibNickname();
 
        if( libNickname.empty() )
            msg = _( "No library defined!" );
        else
            msg.Printf( _( "Symbol not found in %s!" ), libNickname );
 
        aList.emplace_back( _( "Library" ), msg );
    }
}
 
 
BITMAPS SCH_SYMBOL::GetMenuImage() const
{
    return BITMAPS::add_component;
}
 
 
EMBEDDED_FILES* SCH_SYMBOL::GetEmbeddedFiles()
{
    std::unique_ptr<LIB_SYMBOL>& libSymbolRef = GetLibSymbolRef();
 
    if( !libSymbolRef )
        return nullptr;
 
    return GetLibSymbolRef()->GetEmbeddedFiles();
}
 
 
void SCH_SYMBOL::MirrorHorizontally( int aCenter )
{
    int dx = m_pos.x;
 
    SetOrientation( SYM_MIRROR_Y );
    MIRROR( m_pos.x, aCenter );
    dx -= m_pos.x; // dx,0 is the move vector for this transform
 
    for( SCH_FIELD& field : m_fields )
    {
        // Move the fields to the new position because the symbol itself has moved.
        VECTOR2I pos = field.GetTextPos();
        pos.x -= dx;
        field.SetTextPos( pos );
    }
}
 
 
void SCH_SYMBOL::MirrorVertically( int aCenter )
{
    int dy = m_pos.y;
 
    SetOrientation( SYM_MIRROR_X );
    MIRROR( m_pos.y, aCenter );
    dy -= m_pos.y; // 0,dy is the move vector for this transform
 
    for( SCH_FIELD& field : m_fields )
    {
        // Move the fields to the new position because the symbol itself has moved.
        VECTOR2I pos = field.GetTextPos();
        pos.y -= dy;
        field.SetTextPos( pos );
    }
}
 
 
void SCH_SYMBOL::Rotate( const VECTOR2I& aCenter, bool aRotateCCW )
{
    VECTOR2I prev = m_pos;
 
    RotatePoint( m_pos, aCenter, aRotateCCW ? ANGLE_90 : ANGLE_270 );
 
    SetOrientation( aRotateCCW ? SYM_ROTATE_COUNTERCLOCKWISE : SYM_ROTATE_CLOCKWISE );
 
    for( SCH_FIELD& field : m_fields )
    {
        // Move the fields to the new position because the symbol itself has moved.
        VECTOR2I pos = field.GetTextPos();
        pos.x -= prev.x - m_pos.x;
        pos.y -= prev.y - m_pos.y;
        field.SetTextPos( pos );
    }
}
 
 
bool SCH_SYMBOL::Matches( const EDA_SEARCH_DATA& aSearchData, void* aAuxData ) const
{
    if( aSearchData.searchMetadata )
    {
        if( EDA_ITEM::Matches( GetSchSymbolLibraryName(), aSearchData ) )
            return true;
 
        if( EDA_ITEM::Matches( GetShownDescription(), aSearchData ) )
            return true;
 
        if( EDA_ITEM::Matches( GetShownKeyWords(), aSearchData ) )
            return true;
    }
 
    // Fields are searched as separate items
 
    // Search non-field lib draw items (pins, graphical text) for completeness.
    for( const SCH_ITEM& drawItem : GetLibSymbolRef()->GetDrawItems() )
    {
        if( drawItem.Type() == SCH_FIELD_T )
            continue;
 
        if( drawItem.Matches( aSearchData, aAuxData ) )
            return true;
    }
 
    // Symbols are searchable via the child field and pin item text.
    return false;
}
 
 
void SCH_SYMBOL::GetEndPoints( std::vector<DANGLING_END_ITEM>& aItemList )
{
    for( std::unique_ptr<SCH_PIN>& pin : m_pins )
    {
        SCH_PIN* lib_pin = pin->GetLibPin();
 
        if( lib_pin && lib_pin->GetUnit() && m_unit && ( m_unit != lib_pin->GetUnit() ) )
            continue;
 
        DANGLING_END_ITEM item( PIN_END, lib_pin, GetPinPhysicalPosition( lib_pin ), this );
        aItemList.push_back( item );
    }
}
 
 
bool SCH_SYMBOL::UpdateDanglingState( std::vector<DANGLING_END_ITEM>& aItemListByType,
                                      std::vector<DANGLING_END_ITEM>& aItemListByPos, const SCH_SHEET_PATH* aPath )
{
    bool changed = false;
 
    for( std::unique_ptr<SCH_PIN>& pin : m_pins )
    {
        bool previousState = pin->IsDangling();
        pin->SetIsDangling( true );
 
        VECTOR2I pos = m_transform.TransformCoordinate( pin->GetLocalPosition() ) + m_pos;
 
        auto lower = DANGLING_END_ITEM_HELPER::get_lower_pos( aItemListByPos, pos );
        bool do_break = false;
 
        for( auto it = lower; it < aItemListByPos.end() && it->GetPosition() == pos; it++ )
        {
            DANGLING_END_ITEM& each_item = *it;
 
            // Some people like to stack pins on top of each other in a symbol to indicate
            // internal connection. While technically connected, it is not particularly useful
            // to display them that way, so skip any pins that are in the same symbol as this
            // one.
            if( each_item.GetParent() == this )
                continue;
 
            switch( each_item.GetType() )
            {
            case PIN_END:
            case LABEL_END:
            case SHEET_LABEL_END:
            case WIRE_END:
            case NO_CONNECT_END:
            case JUNCTION_END:
                pin->SetIsDangling( false );
                do_break = true;
                break;
 
            default: break;
            }
 
            if( do_break )
                break;
        }
 
        changed = ( changed || ( previousState != pin->IsDangling() ) );
    }
 
    return changed;
}
 
 
VECTOR2I SCH_SYMBOL::GetPinPhysicalPosition( const SCH_PIN* aPin ) const
{
    if( ( aPin == nullptr ) || ( aPin->Type() != SCH_PIN_T ) )
        return VECTOR2I( 0, 0 );
 
    return m_transform.TransformCoordinate( aPin->GetPosition() ) + m_pos;
}
 
 
bool SCH_SYMBOL::HasConnectivityChanges( const SCH_ITEM* aItem, const SCH_SHEET_PATH* aInstance ) const
{
    // Do not compare to ourself.
    if( aItem == this )
        return false;
 
    const SCH_SYMBOL* symbol = dynamic_cast<const SCH_SYMBOL*>( aItem );
 
    // Don't compare against a different SCH_ITEM.
    wxCHECK( symbol, false );
 
    // The move algorithm marks any pins that are being moved without something attached
    // (during the move) as dangling. We always need to recheck connectivity in this case
    // or we will not notice changes when the user places the symbol back in the same position
    // it started.
    for( const std::unique_ptr<SCH_PIN>& pin : m_pins )
    {
        if( pin->IsDangling() )
            return true;
    }
 
    if( GetPosition() != symbol->GetPosition() )
        return true;
 
    if( GetLibId() != symbol->GetLibId() )
        return true;
 
    if( GetUnitSelection( aInstance ) != symbol->GetUnitSelection( aInstance ) )
        return true;
 
    if( GetRef( aInstance ) != symbol->GetRef( aInstance ) )
        return true;
 
    // Power symbol value field changes are connectivity changes.
    if( IsPower() && ( GetValue( true, aInstance, false ) != symbol->GetValue( true, aInstance, false ) ) )
        return true;
 
    if( m_pins.size() != symbol->m_pins.size() )
        return true;
 
    for( size_t i = 0; i < m_pins.size(); i++ )
    {
        if( m_pins[i]->HasConnectivityChanges( symbol->m_pins[i].get() ) )
            return true;
    }
 
    return false;
}
 
 
std::vector<VECTOR2I> SCH_SYMBOL::GetConnectionPoints() const
{
    std::vector<VECTOR2I> retval;
 
    for( const std::unique_ptr<SCH_PIN>& pin : m_pins )
    {
        // Collect only pins attached to the current unit and convert.
        // others are not associated to this symbol instance
        int pin_unit = pin->GetLibPin() ? pin->GetLibPin()->GetUnit() : GetUnit();
        int pin_bodyStyle = pin->GetLibPin() ? pin->GetLibPin()->GetBodyStyle() : GetBodyStyle();
 
        if( pin_unit > 0 && pin_unit != GetUnit() )
            continue;
 
        if( pin_bodyStyle > 0 && pin_bodyStyle != GetBodyStyle() )
            continue;
 
        retval.push_back( m_transform.TransformCoordinate( pin->GetLocalPosition() ) + m_pos );
    }
 
    return retval;
}
 
 
SCH_ITEM* SCH_SYMBOL::GetDrawItem( const VECTOR2I& aPosition, KICAD_T aType )
{
    if( m_part )
    {
        // Calculate the position relative to the symbol.
        VECTOR2I libPosition = aPosition - m_pos;
 
        return m_part->LocateDrawItem( m_unit, m_bodyStyle, aType, libPosition, m_transform );
    }
 
    return nullptr;
}
 
 
wxString SCH_SYMBOL::GetItemDescription( UNITS_PROVIDER* aUnitsProvider, bool aFull ) const
{
    return wxString::Format( _( "Symbol %s [%s]" ),
                             KIUI::EllipsizeMenuText( GetField( FIELD_T::REFERENCE )->GetText() ),
                             KIUI::EllipsizeMenuText( GetLibId().GetLibItemName() ) );
}
 
 
INSPECT_RESULT SCH_SYMBOL::Visit( INSPECTOR aInspector, void* aTestData, const std::vector<KICAD_T>& aScanTypes )
{
    for( KICAD_T scanType : aScanTypes )
    {
        if( scanType == SCH_LOCATE_ANY_T || ( scanType == SCH_SYMBOL_T )
            || ( scanType == SCH_SYMBOL_LOCATE_POWER_T && m_part && m_part->IsPower() ) )
        {
            if( INSPECT_RESULT::QUIT == aInspector( this, aTestData ) )
                return INSPECT_RESULT::QUIT;
        }
 
        if( scanType == SCH_LOCATE_ANY_T || scanType == SCH_FIELD_T )
        {
            for( SCH_FIELD& field : m_fields )
            {
                if( INSPECT_RESULT::QUIT == aInspector( &field, (void*) this ) )
                    return INSPECT_RESULT::QUIT;
            }
        }
 
        if( scanType == SCH_FIELD_LOCATE_REFERENCE_T )
        {
            if( INSPECT_RESULT::QUIT == aInspector( GetField( FIELD_T::REFERENCE ), (void*) this ) )
                return INSPECT_RESULT::QUIT;
        }
 
        if( scanType == SCH_FIELD_LOCATE_VALUE_T
            || ( scanType == SCH_SYMBOL_LOCATE_POWER_T && m_part && m_part->IsPower() ) )
        {
            if( INSPECT_RESULT::QUIT == aInspector( GetField( FIELD_T::VALUE ), (void*) this ) )
                return INSPECT_RESULT::QUIT;
        }
 
        if( scanType == SCH_FIELD_LOCATE_FOOTPRINT_T )
        {
            if( INSPECT_RESULT::QUIT == aInspector( GetField( FIELD_T::FOOTPRINT ), (void*) this ) )
                return INSPECT_RESULT::QUIT;
        }
 
        if( scanType == SCH_FIELD_LOCATE_DATASHEET_T )
        {
            if( INSPECT_RESULT::QUIT == aInspector( GetField( FIELD_T::DATASHEET ), (void*) this ) )
                return INSPECT_RESULT::QUIT;
        }
 
        if( scanType == SCH_LOCATE_ANY_T || scanType == SCH_PIN_T )
        {
            for( const std::unique_ptr<SCH_PIN>& pin : m_pins )
            {
                // Collect only pins attached to the current unit and convert.
                // others are not associated to this symbol instance
                int pin_unit = pin->GetLibPin() ? pin->GetLibPin()->GetUnit() : GetUnit();
                int pin_bodyStyle = pin->GetLibPin() ? pin->GetLibPin()->GetBodyStyle() : GetBodyStyle();
 
                if( pin_unit > 0 && pin_unit != GetUnit() )
                    continue;
 
                if( pin_bodyStyle > 0 && pin_bodyStyle != GetBodyStyle() )
                    continue;
 
                if( INSPECT_RESULT::QUIT == aInspector( pin.get(), (void*) this ) )
                    return INSPECT_RESULT::QUIT;
            }
        }
    }
 
    return INSPECT_RESULT::CONTINUE;
}
 
 
bool SCH_SYMBOL::operator<( const SCH_ITEM& aItem ) const
{
    if( Type() != aItem.Type() )
        return Type() < aItem.Type();
 
    const SCH_SYMBOL* symbol = static_cast<const SCH_SYMBOL*>( &aItem );
 
    BOX2I rect = GetBodyAndPinsBoundingBox();
 
    if( rect.GetArea() != symbol->GetBodyAndPinsBoundingBox().GetArea() )
        return rect.GetArea() < symbol->GetBodyAndPinsBoundingBox().GetArea();
 
    if( m_pos.x != symbol->m_pos.x )
        return m_pos.x < symbol->m_pos.x;
 
    if( m_pos.y != symbol->m_pos.y )
        return m_pos.y < symbol->m_pos.y;
 
    return m_Uuid < aItem.m_Uuid; // Ensure deterministic sort
}
 
 
bool SCH_SYMBOL::operator==( const SCH_SYMBOL& aSymbol ) const
{
    std::vector<SCH_FIELD*> fields, otherFields;
 
    GetFields( fields, false );
    aSymbol.GetFields( otherFields, false );
 
    if( fields.size() != otherFields.size() )
        return false;
 
    for( int ii = 0; ii < (int) fields.size(); ii++ )
    {
        if( fields[ii]->GetId() == FIELD_T::REFERENCE )
            continue;
 
        if( fields[ii]->GetText().Cmp( otherFields[ii]->GetText() ) != 0 )
            return false;
    }
 
    return true;
}
 
 
bool SCH_SYMBOL::operator!=( const SCH_SYMBOL& aSymbol ) const
{
    return !( *this == aSymbol );
}
 
 
SCH_SYMBOL& SCH_SYMBOL::operator=( const SCH_SYMBOL& aSymbol )
{
    wxCHECK_MSG( Type() == aSymbol.Type(), *this,
                 wxT( "Cannot assign object type " ) + aSymbol.GetClass() + wxT( " to type " ) + GetClass() );
 
    if( &aSymbol != this )
    {
        SYMBOL::operator=( aSymbol );
 
        m_lib_id = aSymbol.m_lib_id;
        m_part.reset( aSymbol.m_part ? new LIB_SYMBOL( *aSymbol.m_part ) : nullptr );
        m_pos = aSymbol.m_pos;
        m_unit = aSymbol.m_unit;
        m_bodyStyle = aSymbol.m_bodyStyle;
        m_transform = aSymbol.m_transform;
 
        m_instances = aSymbol.m_instances;
        m_instancePathIndex = aSymbol.m_instancePathIndex;
 
        m_fields = aSymbol.m_fields; // std::vector's assignment operator
 
        // Reparent fields after assignment to new symbol.
        for( SCH_FIELD& field : m_fields )
            field.SetParent( this );
 
        UpdatePins();
        m_variantSymbolCache.clear();
    }
 
    return *this;
}
 
 
bool SCH_SYMBOL::HitTest( const VECTOR2I& aPosition, int aAccuracy ) const
{
    BOX2I bBox = GetBodyBoundingBox();
    bBox.Inflate( aAccuracy / 2 );
 
    if( bBox.Contains( aPosition ) )
        return true;
 
    return false;
}
 
 
bool SCH_SYMBOL::HitTest( const BOX2I& aRect, bool aContained, int aAccuracy ) const
{
    if( m_flags & STRUCT_DELETED || m_flags & SKIP_STRUCT )
        return false;
 
    BOX2I rect = aRect;
 
    rect.Inflate( aAccuracy / 2 );
 
    if( aContained )
        return rect.Contains( GetBodyBoundingBox() );
 
    return rect.Intersects( GetBodyBoundingBox() );
}
 
 
bool SCH_SYMBOL::HitTest( const SHAPE_LINE_CHAIN& aPoly, bool aContained ) const
{
    if( m_flags & STRUCT_DELETED || m_flags & SKIP_STRUCT )
        return false;
 
    return KIGEOM::BoxHitTest( aPoly, GetBodyBoundingBox(), aContained );
}
 
 
bool SCH_SYMBOL::doIsConnected( const VECTOR2I& aPosition ) const
{
    VECTOR2I new_pos = m_transform.InverseTransform().TransformCoordinate( aPosition - m_pos );
 
    for( const std::unique_ptr<SCH_PIN>& pin : m_pins )
    {
        if( pin->GetType() == ELECTRICAL_PINTYPE::PT_NC )
            continue;
 
        // Collect only pins attached to the current unit and convert.
        // others are not associated to this symbol instance
        if( pin->GetUnit() > 0 && pin->GetUnit() != GetUnit() )
            continue;
 
        if( pin->GetBodyStyle() > 0 && pin->GetBodyStyle() != GetBodyStyle() )
            continue;
 
        if( pin->GetLocalPosition() == new_pos )
            return true;
    }
 
    return false;
}
 
 
bool SCH_SYMBOL::IsInNetlist() const
{
    return m_isInNetlist;
}
 
 
void SCH_SYMBOL::Plot( PLOTTER* aPlotter, bool aBackground, const SCH_PLOT_OPTS& aPlotOpts, int aUnit, int aBodyStyle,
                       const VECTOR2I& aOffset, bool aDimmed )
{
    if( aBackground )
        return;
 
    SCH_SHEET_PATH*   sheet = Schematic() ? &Schematic()->CurrentSheet() : nullptr;
    const LIB_SYMBOL* effectiveSym = GetEffectiveLibSymbol( sheet );
 
    if( effectiveSym )
    {
        bool usingAlternate = ( effectiveSym != m_part.get() );
 
        std::vector<const SCH_PIN*> libPins = effectiveSym->GetGraphicalPins( GetUnit(), GetBodyStyle() );
 
        // Copy the source so we can re-orient and translate it.
        LIB_SYMBOL            tempSymbol( *effectiveSym );
        std::vector<SCH_PIN*> tempPins = tempSymbol.GetGraphicalPins( GetUnit(), GetBodyStyle() );
        std::vector<SCH_PIN*> symbolPins = MapLibPins( libPins, usingAlternate );
 
        // Copy the pin info from the symbol to the temp pins.
        for( unsigned i = 0; i < tempPins.size(); ++i )
        {
            SCH_PIN* symbolPin = symbolPins[i];
            SCH_PIN* tempPin = tempPins[i];
 
            if( !symbolPin )
                continue;
 
            tempPin->SetName( symbolPin->GetShownName() );
            tempPin->SetType( symbolPin->GetType() );
            tempPin->SetShape( symbolPin->GetShape() );
 
            if( symbolPin->IsDangling() )
                tempPin->SetFlags( IS_DANGLING );
        }
 
        for( SCH_ITEM& item : tempSymbol.GetDrawItems() )
        {
            if( EDA_TEXT* text = dynamic_cast<EDA_TEXT*>( &item ) )
            {
                // Use SCH_FIELD's text resolver
                SCH_FIELD dummy( this, FIELD_T::USER );
                dummy.SetText( text->GetText() );
                text->SetText( dummy.GetShownText( false ) );
            }
        }
 
        SCH_RENDER_SETTINGS* renderSettings = getRenderSettings( aPlotter );
        TRANSFORM            savedTransform = renderSettings->m_Transform;
        renderSettings->m_Transform = GetTransform();
        aPlotter->StartBlock( nullptr );
 
        wxString variant = Schematic() ? Schematic()->GetCurrentVariant() : wxString();
        bool            dnp = GetDNP( sheet, variant );
 
        for( bool local_background : { true, false } )
        {
            tempSymbol.Plot( aPlotter, local_background, aPlotOpts, GetUnit(), GetBodyStyle(), m_pos, dnp );
 
            for( SCH_FIELD field : m_fields )
            {
                field.ClearRenderCache();
                field.Plot( aPlotter, local_background, aPlotOpts, GetUnit(), GetBodyStyle(), m_pos, dnp );
 
                if( IsSymbolLikePowerLocalLabel() && field.GetId() == FIELD_T::VALUE
                    && ( field.IsVisible() || field.IsForceVisible() ) )
                {
                    PlotLocalPowerIconShape( aPlotter );
                }
            }
        }
 
        if( dnp )
            PlotDNP( aPlotter );
 
        // Plot attributes to a hypertext menu
        if( aPlotOpts.m_PDFPropertyPopups )
        {
            std::vector<wxString> properties;
 
            for( const SCH_FIELD& field : GetFields() )
            {
                wxString text_field = field.GetShownText( sheet, false, 0, variant );
 
                if( text_field.IsEmpty() )
                    continue;
 
                properties.emplace_back( wxString::Format( wxT( "!%s = %s" ), field.GetName(), text_field ) );
            }
 
            if( !effectiveSym->GetKeyWords().IsEmpty() )
            {
                properties.emplace_back(
                        wxString::Format( wxT( "!%s = %s" ), _( "Keywords" ),
                                          effectiveSym->GetKeyWords() ) );
            }
 
            aPlotter->HyperlinkMenu( GetBoundingBox(), properties );
        }
 
        aPlotter->EndBlock( nullptr );
        renderSettings->m_Transform = savedTransform;
 
        if( !effectiveSym->IsPower() )
            aPlotter->Bookmark( GetBoundingBox(), GetRef( sheet ), _( "Symbols" ) );
    }
}
 
 
void SCH_SYMBOL::PlotDNP( PLOTTER* aPlotter ) const
{
    BOX2I    bbox = GetBodyBoundingBox();
    BOX2I    pins = GetBodyAndPinsBoundingBox();
    VECTOR2D margins( std::max( bbox.GetX() - pins.GetX(), pins.GetEnd().x - bbox.GetEnd().x ),
                      std::max( bbox.GetY() - pins.GetY(), pins.GetEnd().y - bbox.GetEnd().y ) );
    int      strokeWidth = 3.0 * schIUScale.MilsToIU( DEFAULT_LINE_WIDTH_MILS );
 
    margins.x = std::max( margins.x * 0.6, margins.y * 0.3 );
    margins.y = std::max( margins.y * 0.6, margins.x * 0.3 );
    bbox.Inflate( KiROUND( margins.x ), KiROUND( margins.y ) );
 
    SCH_RENDER_SETTINGS* renderSettings = getRenderSettings( aPlotter );
    aPlotter->SetColor( renderSettings->GetLayerColor( LAYER_DNP_MARKER ) );
 
    aPlotter->ThickSegment( bbox.GetOrigin(), bbox.GetEnd(), strokeWidth, nullptr );
 
    aPlotter->ThickSegment( bbox.GetOrigin() + VECTOR2I( bbox.GetWidth(), 0 ),
                            bbox.GetOrigin() + VECTOR2I( 0, bbox.GetHeight() ), strokeWidth, nullptr );
}
 

static void plotLocalPowerIcon( PLOTTER* aPlotter, const VECTOR2D& aPos, double aSize, bool aRotate )
{
    double lineWidth = aSize / 10.0;
 
    std::vector<SCH_SHAPE> shapeList;
    SCH_SYMBOL::BuildLocalPowerIconShape( shapeList, aPos, aSize, lineWidth, aRotate );
    int tolerance = 100; // approx error to approximate a Bezier curve by segments
 
    for( const SCH_SHAPE& shape : shapeList )
    {
        // Currently there are only 2 shapes: BEZIER and CIRCLE
        FILL_T filled = shape.GetFillMode() == FILL_T::NO_FILL ? FILL_T::NO_FILL : FILL_T::FILLED_SHAPE;
 
        if( shape.GetShape() == SHAPE_T::BEZIER )
            aPlotter->BezierCurve( shape.GetStart(), shape.GetBezierC1(), shape.GetBezierC2(), shape.GetEnd(),
                                   tolerance, lineWidth );
        else if( shape.GetShape() == SHAPE_T::CIRCLE )
            aPlotter->Circle( shape.getCenter(), shape.GetRadius() * 2, filled, lineWidth );
    }
}
 
 
void SCH_SYMBOL::PlotLocalPowerIconShape( PLOTTER* aPlotter ) const
{
    const SCH_FIELD* field = GetField( FIELD_T::VALUE );
 
    // Plot the local power pin indicator icon shape
    BOX2I bbox = field->GetBoundingBox();
 
    // Calculate the text orientation according to the parent orientation.
    EDA_ANGLE orient = field->GetTextAngle();
 
    if( GetTransform().y1 )
    {
        // Rotate symbol 90 degrees.
        if( orient.IsHorizontal() )
            orient = ANGLE_VERTICAL;
        else
            orient = ANGLE_HORIZONTAL;
    }
 
    bool rotated = !orient.IsHorizontal();
 
    VECTOR2D pos;
    double   size = bbox.GetHeight() / 1.5;
 
    if( rotated )
    {
        pos = VECTOR2D( bbox.GetRight() - bbox.GetWidth() / 6.0, bbox.GetBottom() + bbox.GetWidth() / 2.0 );
        size = bbox.GetWidth() / 1.5;
    }
    else
    {
        pos = VECTOR2D( bbox.GetLeft() - bbox.GetHeight() / 2.0, bbox.GetBottom() - bbox.GetHeight() / 6.0 );
    }
 
    // TODO: build and plot icon shape
    plotLocalPowerIcon( aPlotter, pos, size, rotated );
}
 
 
void SCH_SYMBOL::PlotPins( PLOTTER* aPlotter, bool aDnp ) const
{
    SCH_SHEET_PATH*   sheet = Schematic() ? &Schematic()->CurrentSheet() : nullptr;
    const LIB_SYMBOL* effectiveSym = GetEffectiveLibSymbol( sheet );
 
    if( effectiveSym )
    {
        bool usingAlternate = ( effectiveSym != m_part.get() );
 
        SCH_RENDER_SETTINGS* renderSettings = getRenderSettings( aPlotter );
        TRANSFORM            savedTransform = renderSettings->m_Transform;
        renderSettings->m_Transform = GetTransform();
 
        std::vector<const SCH_PIN*> libPins = effectiveSym->GetGraphicalPins( GetUnit(), GetBodyStyle() );
 
        // Copy the source to stay const
        LIB_SYMBOL            tempSymbol( *effectiveSym );
        std::vector<SCH_PIN*> tempPins = tempSymbol.GetGraphicalPins( GetUnit(), GetBodyStyle() );
        std::vector<SCH_PIN*> symbolPins = MapLibPins( libPins, usingAlternate );
        SCH_PLOT_OPTS         plotOpts;
 
        // Copy the pin info from the symbol to the temp pins.
        for( unsigned i = 0; i < tempPins.size(); ++i )
        {
            SCH_PIN* symbolPin = symbolPins[i];
            SCH_PIN* tempPin = tempPins[i];
 
            if( !symbolPin )
                continue;
 
            tempPin->SetName( symbolPin->GetShownName() );
            tempPin->SetType( symbolPin->GetType() );
            tempPin->SetShape( symbolPin->GetShape() );
            tempPin->Plot( aPlotter, false, plotOpts, GetUnit(), GetBodyStyle(), m_pos, aDnp );
        }
 
        renderSettings->m_Transform = savedTransform;
    }
}
 
 
bool SCH_SYMBOL::HasBrightenedPins()
{
    for( const std::unique_ptr<SCH_PIN>& pin : m_pins )
    {
        if( pin->IsBrightened() )
            return true;
    }
 
    return false;
}
 
 
void SCH_SYMBOL::ClearBrightenedPins()
{
    for( std::unique_ptr<SCH_PIN>& pin : m_pins )
        pin->ClearBrightened();
}
 
 
/*
 * When modified at the schematic level, we still store the values of these flags in the
 * associated m_part.  If m_part now diverges from other usages, a new derived LIB_SYMBOL
 * will be created and stored locally in the schematic.
 */
bool SCH_SYMBOL::GetShowPinNames() const
{
    return m_part && m_part->GetShowPinNames();
}
 
 
void SCH_SYMBOL::SetShowPinNames( bool aShow )
{
    if( m_part )
        m_part->SetShowPinNames( aShow );
}
 
 
bool SCH_SYMBOL::GetShowPinNumbers() const
{
    return m_part && m_part->GetShowPinNumbers();
}
 
 
void SCH_SYMBOL::SetShowPinNumbers( bool aShow )
{
    if( m_part )
        m_part->SetShowPinNumbers( aShow );
}
 
 
bool SCH_SYMBOL::IsPointClickableAnchor( const VECTOR2I& aPos ) const
{
    for( const std::unique_ptr<SCH_PIN>& pin : m_pins )
    {
        int pin_unit = pin->GetLibPin() ? pin->GetLibPin()->GetUnit() : GetUnit();
        int pin_bodyStyle = pin->GetLibPin() ? pin->GetLibPin()->GetBodyStyle() : GetBodyStyle();
 
        if( pin_unit > 0 && pin_unit != GetUnit() )
            continue;
 
        if( pin_bodyStyle > 0 && pin_bodyStyle != GetBodyStyle() )
            continue;
 
        if( pin->IsPointClickableAnchor( aPos ) )
            return true;
    }
 
    return false;
}
 
 
bool SCH_SYMBOL::IsSymbolLikePowerGlobalLabel() const
{
    // return true if the symbol is equivalent to a global label:
    // It is a Power symbol
    // It has only one pin type Power input
 
    if( !GetLibSymbolRef() || !GetLibSymbolRef()->IsGlobalPower() )
        return false;
 
    std::vector<SCH_PIN*> pin_list = GetAllLibPins();
 
    if( pin_list.size() != 1 )
        return false;
 
    return pin_list[0]->GetType() == ELECTRICAL_PINTYPE::PT_POWER_IN;
}
 
 
bool SCH_SYMBOL::IsSymbolLikePowerLocalLabel() const
{
    // return true if the symbol is equivalent to a local label:
    // It is a Power symbol
    // It has only one pin type Power input
 
    if( !GetLibSymbolRef() || !GetLibSymbolRef()->IsLocalPower() )
        return false;
 
    std::vector<SCH_PIN*> pin_list = GetAllLibPins();
 
    if( pin_list.size() != 1 )
        return false;
 
    return pin_list[0]->GetType() == ELECTRICAL_PINTYPE::PT_POWER_IN;
}
 
 
bool SCH_SYMBOL::IsLocalPower() const
{
    if( !m_part )
        return false;
 
    return m_part->IsLocalPower();
}
 
 
bool SCH_SYMBOL::IsGlobalPower() const
{
    if( !m_part )
        return false;
 
    return m_part->IsGlobalPower();
}
 
 
bool SCH_SYMBOL::IsPower() const
{
    return IsLocalPower() || IsGlobalPower();
}
 
 
bool SCH_SYMBOL::IsNormal() const
{
    wxCHECK( m_part, false );
 
    return m_part->IsNormal();
}
 
 
std::unordered_set<wxString> SCH_SYMBOL::GetComponentClassNames( const SCH_SHEET_PATH* aPath ) const
{
    std::unordered_set<wxString> componentClass;
 
    auto getComponentClassFields = [&]( const std::vector<SCH_FIELD>& fields )
    {
        for( const SCH_FIELD& field : fields )
        {
            if( field.GetCanonicalName() == wxT( "Component Class" ) )
            {
                if( field.GetShownText( aPath, false ) != wxEmptyString )
                    componentClass.insert( field.GetShownText( aPath, false ) );
            }
        }
    };
 
    // First get component classes set on the symbol itself
    getComponentClassFields( m_fields );
 
    // Now get component classes set on any enclosing rule areas
    for( const SCH_RULE_AREA* ruleArea : m_rule_areas_cache )
    {
        for( const SCH_DIRECTIVE_LABEL* label : ruleArea->GetDirectives() )
        {
            getComponentClassFields( label->GetFields() );
        }
    }
 
    return componentClass;
}
 
 
std::optional<SCH_SYMBOL_VARIANT> SCH_SYMBOL::GetVariant( const SCH_SHEET_PATH& aInstance,
                                                          const wxString&       aVariantName ) const
{
    SCH_SYMBOL_INSTANCE instance;
 
    if( !GetInstance( instance, aInstance.Path() ) || !instance.m_Variants.contains( aVariantName ) )
        return std::nullopt;
 
    return instance.m_Variants.find( aVariantName )->second;
}
 
 
void SCH_SYMBOL::AddVariant( const SCH_SHEET_PATH& aInstance, const SCH_SYMBOL_VARIANT& aVariant )
{
    SCH_SYMBOL_INSTANCE* instance = getInstance( aInstance );
 
    // The instance path must already exist.
    if( !instance )
        return;
 
    instance->m_Variants.insert( std::make_pair( aVariant.m_Name, aVariant ) );
}
 
 
LIB_SYMBOL* SCH_SYMBOL::GetVariantLibSymbol( const wxString&      aVariantName,
                                              const SCH_SHEET_PATH& aPath ) const
{
    if( aVariantName.IsEmpty() )
        return nullptr;
 
    const SCH_SYMBOL_INSTANCE* instance = getInstance( aPath );
 
    if( !instance || !instance->m_Variants.contains( aVariantName ) )
        return nullptr;
 
    const SCH_SYMBOL_VARIANT& variant = instance->m_Variants.at( aVariantName );
 
    if( !variant.m_SymbolOverride )
        return nullptr;
 
    const LIB_ID& libId = *variant.m_SymbolOverride;
    wxString      libIdStr = libId.Format();
 
    // Cache by LIB_ID string so hierarchical instances sharing the same alternate symbol
    // reuse a single flattened copy regardless of sheet path or variant name.  Failed
    // resolutions are cached as nullptr to keep unresolvable overrides from hitting the
    // library adapter on every paint.
    auto cacheIt = m_variantSymbolCache.find( libIdStr );
 
    if( cacheIt != m_variantSymbolCache.end() )
        return cacheIt->second.get();
 
    if( libId == m_lib_id )
    {
        m_variantSymbolCache[libIdStr] = nullptr;
        return nullptr;
    }
 
    SCHEMATIC* schematic = Schematic();
 
    if( !schematic )
        return nullptr;
 
    SYMBOL_LIBRARY_ADAPTER* adapter = PROJECT_SCH::SymbolLibAdapter( &schematic->Project() );
 
    if( !adapter )
        return nullptr;
 
    try
    {
        if( LIB_SYMBOL* libSymbol = adapter->LoadSymbol( libId ) )
        {
            std::unique_ptr<LIB_SYMBOL>& cached = m_variantSymbolCache[libIdStr];
 
            cached = libSymbol->Flatten();
 
            if( m_part && !ValidateVariantSymbolCompatibility( *m_part, *cached ).empty() )
            {
                cached.reset();
                return nullptr;
            }
 
            return cached.get();
        }
    }
    catch( const IO_ERROR& )
    {
    }
 
    m_variantSymbolCache[libIdStr] = nullptr;
    return nullptr;
}
 
 
const LIB_SYMBOL* SCH_SYMBOL::GetEffectiveLibSymbol( const SCH_SHEET_PATH* aPath ) const
{
    if( aPath && Schematic() )
    {
        const wxString& variantName = Schematic()->GetCurrentVariant();
 
        if( !variantName.IsEmpty() )
        {
            LIB_SYMBOL* altSymbol = GetVariantLibSymbol( variantName, *aPath );
 
            if( altSymbol )
                return altSymbol;
        }
    }
 
    return m_part.get();
}
 
 
std::vector<SCH_PIN*> SCH_SYMBOL::MapLibPins( const std::vector<const SCH_PIN*>& aLibPins,
                                              bool aByNumber ) const
{
    std::vector<SCH_PIN*> mapped;
 
    mapped.reserve( aLibPins.size() );
 
    if( aByNumber )
    {
        const LIB_SYMBOL*           baseSymbol = m_part.get();
        std::vector<const SCH_PIN*> basePins = baseSymbol->GetGraphicalPins( GetUnit(), GetBodyStyle() );
        std::vector<bool>           matched( basePins.size(), false );
 
        for( const SCH_PIN* alternatePin : aLibPins )
        {
            SCH_PIN* instancePin = nullptr;
 
            for( size_t i = 0; i < basePins.size(); ++i )
            {
                if( matched[i] || !VariantSymbolPinsMatch( *basePins[i], *alternatePin ) )
                    continue;
 
                matched[i] = true;
                instancePin = GetPin( const_cast<SCH_PIN*>( basePins[i] ) );
                break;
            }
 
            mapped.push_back( instancePin );
        }
    }
    else
    {
        for( const SCH_PIN* libPin : aLibPins )
            mapped.push_back( GetPin( const_cast<SCH_PIN*>( libPin ) ) );
    }
 
    return mapped;
}
 
 
void SCH_SYMBOL::DeleteVariant( const KIID_PATH& aPath, const wxString& aVariantName )
{
    SCH_SYMBOL_INSTANCE* instance = getInstance( aPath );
 
    // The instance path must already exist.
    if( !instance || !instance->m_Variants.contains( aVariantName ) )
        return;
 
    instance->m_Variants.erase( aVariantName );
}
 
 
void SCH_SYMBOL::RenameVariant( const KIID_PATH& aPath, const wxString& aOldName,
                                const wxString& aNewName )
{
    SCH_SYMBOL_INSTANCE* instance = getInstance( aPath );
 
    // The instance path must already exist and contain the old variant.
    if( !instance || !instance->m_Variants.contains( aOldName ) )
        return;
 
    // Get the variant data, update the name, and re-insert with new key
    SCH_SYMBOL_VARIANT variant = instance->m_Variants[aOldName];
    variant.m_Name = aNewName;
    instance->m_Variants.erase( aOldName );
    instance->m_Variants.insert( std::make_pair( aNewName, variant ) );
}
 
 
void SCH_SYMBOL::CopyVariant( const KIID_PATH& aPath, const wxString& aSourceVariant,
                              const wxString& aNewVariant )
{
    SCH_SYMBOL_INSTANCE* instance = getInstance( aPath );
 
    // The instance path must already exist and contain the source variant.
    if( !instance || !instance->m_Variants.contains( aSourceVariant ) )
        return;
 
    // Copy the variant data with a new name
    SCH_SYMBOL_VARIANT variant = instance->m_Variants[aSourceVariant];
    variant.m_Name = aNewVariant;
    instance->m_Variants.insert( std::make_pair( aNewVariant, variant ) );
}
 
 
void SCH_SYMBOL::SetVariantSymbolOverride( const SCH_SHEET_PATH& aPath,
                                           const wxString& aVariantName,
                                           const LIB_ID& aLibId )
{
    SCH_SYMBOL_INSTANCE* instance = getInstance( aPath );
 
    if( !instance )
        return;
 
    if( !instance->m_Variants.contains( aVariantName ) )
    {
        SCH_SYMBOL_VARIANT newVariant( aVariantName );
        newVariant.InitializeAttributes( *this );
        instance->m_Variants.insert( std::make_pair( aVariantName, newVariant ) );
    }
 
    instance->m_Variants[aVariantName].m_SymbolOverride = aLibId;
    m_variantSymbolCache.clear();
}
 
 
bool SCH_SYMBOL::ClearVariantSymbolOverride( const SCH_SHEET_PATH& aPath,
                                             const wxString& aVariantName )
{
    SCH_SYMBOL_INSTANCE* instance = getInstance( aPath );
 
    if( !instance || !instance->m_Variants.contains( aVariantName ) )
        return false;
 
    SCH_SYMBOL_VARIANT& variant = instance->m_Variants[aVariantName];
 
    if( !variant.m_SymbolOverride )
        return false;
 
    variant.m_SymbolOverride.reset();
    m_variantSymbolCache.clear();
    return true;
}
 
 
bool SCH_SYMBOL::operator==( const SCH_ITEM& aOther ) const
{
    if( Type() != aOther.Type() )
        return false;
 
    const SCH_SYMBOL& symbol = static_cast<const SCH_SYMBOL&>( aOther );
 
    if( GetLibId() != symbol.GetLibId() )
        return false;
 
    if( GetPosition() != symbol.GetPosition() )
        return false;
 
    if( GetUnit() != symbol.GetUnit() )
        return false;
 
    if( GetBodyStyle() != symbol.GetBodyStyle() )
        return false;
 
    if( GetTransform() != symbol.GetTransform() )
        return false;
 
    if( GetFields() != symbol.GetFields() )
        return false;
 
    if( m_pins.size() != symbol.m_pins.size() )
        return false;
 
    if( m_excludedFromSim != symbol.m_excludedFromSim )
        return false;
 
    if( m_excludedFromBOM != symbol.m_excludedFromBOM )
        return false;
 
    if( m_DNP != symbol.m_DNP )
        return false;
 
    if( m_excludedFromBoard != symbol.m_excludedFromBoard )
        return false;
 
    if( m_excludedFromPosFiles != symbol.m_excludedFromPosFiles )
        return false;
 
    if( m_schLibSymbolName != symbol.m_schLibSymbolName )
        return false;
 
    for( unsigned i = 0; i < m_pins.size(); ++i )
    {
        if( *m_pins[i] != *symbol.m_pins[i] )
            return false;
    }
 
#if 0
    // This has historically been a compare of the current instance, rather than a compare
    // of all instances.  Probably better to keep it that way for now.
    if( m_instanceReferences != symbol.m_instanceReferences )
        return false;
#endif
 
    return true;
}
 
 
double SCH_SYMBOL::Similarity( const SCH_ITEM& aOther ) const
{
    if( Type() != aOther.Type() )
        return 0.0;
 
    const SCH_SYMBOL& symbol = static_cast<const SCH_SYMBOL&>( aOther );
 
    if( GetLibId() != symbol.GetLibId() )
        return 0.0;
 
    if( GetPosition() == symbol.GetPosition() )
        return 1.0;
 
    return 0.0;
}
 
 
void SCH_SYMBOL::BuildLocalPowerIconShape( std::vector<SCH_SHAPE>& aShapeList, const VECTOR2D& aPos, double aSize,
                                           double aLineWidth, bool aHorizontal )
{
    SCH_LAYER_ID layer = LAYER_DEVICE; //dummy param
 
    double x_right = aSize / 1.6180339887;
    double x_middle = x_right / 2.0;
 
    VECTOR2D bottomPt = VECTOR2D{ x_middle, 0 };
    VECTOR2D leftPt = VECTOR2D{ 0, 2.0 * -aSize / 3.0 };
    VECTOR2D rightPt = VECTOR2D{ x_right, 2.0 * -aSize / 3.0 };
 
    VECTOR2D bottomAnchorPt = VECTOR2D{ x_middle, -aSize / 4.0 };
    VECTOR2D leftSideAnchorPt1 = VECTOR2D{ 0, -aSize / 2.5 };
    VECTOR2D leftSideAnchorPt2 = VECTOR2D{ 0, -aSize * 1.15 };
    VECTOR2D rightSideAnchorPt1 = VECTOR2D{ x_right, -aSize / 2.5 };
    VECTOR2D rightSideAnchorPt2 = VECTOR2D{ x_right, -aSize * 1.15 };
 
    aShapeList.emplace_back( SHAPE_T::BEZIER, layer, aLineWidth, FILL_T::NO_FILL );
    aShapeList.back().SetStart( bottomPt );
    aShapeList.back().SetBezierC1( bottomAnchorPt );
    aShapeList.back().SetBezierC2( leftSideAnchorPt1 );
    aShapeList.back().SetEnd( leftPt );
 
 
    aShapeList.emplace_back( SHAPE_T::BEZIER, layer, aLineWidth, FILL_T::NO_FILL );
    aShapeList.back().SetStart( leftPt );
    aShapeList.back().SetBezierC1( leftSideAnchorPt2 );
    aShapeList.back().SetBezierC2( rightSideAnchorPt2 );
    aShapeList.back().SetEnd( rightPt );
 
    aShapeList.emplace_back( SHAPE_T::BEZIER, layer, aLineWidth, FILL_T::NO_FILL );
    aShapeList.back().SetStart( rightPt );
    aShapeList.back().SetBezierC1( rightSideAnchorPt1 );
    aShapeList.back().SetBezierC2( bottomAnchorPt );
    aShapeList.back().SetEnd( bottomPt );
 
    aShapeList.emplace_back( SHAPE_T::CIRCLE, layer, 0, FILL_T::FILLED_SHAPE );
    aShapeList.back().SetCenter( ( leftPt + rightPt ) / 2.0 );
    aShapeList.back().SetRadius( aSize / 15.0 );
 
    for( SCH_SHAPE& shape : aShapeList )
    {
        if( aHorizontal )
            shape.Rotate( VECTOR2I( 0, 0 ), true );
 
        shape.Move( aPos );
    }
}
 
 
SCH_SYMBOL_INSTANCE* SCH_SYMBOL::getInstance( const KIID_PATH& aSheetPath )
{
    if( auto it = m_instancePathIndex.find( aSheetPath ); it != m_instancePathIndex.end() )
        return &m_instances[it->second];
 
    return nullptr;
}
 
 
const SCH_SYMBOL_INSTANCE* SCH_SYMBOL::getInstance( const KIID_PATH& aSheetPath ) const
{
    if( auto it = m_instancePathIndex.find( aSheetPath ); it != m_instancePathIndex.end() )
        return &m_instances[it->second];
 
    return nullptr;
}
 
 
static struct SCH_SYMBOL_DESC
{
    SCH_SYMBOL_DESC()
    {
        ENUM_MAP<SYMBOL_ORIENTATION_PROP>::Instance()
                .Map( SYMBOL_ANGLE_0, wxS( "0" ) )
                .Map( SYMBOL_ANGLE_90, wxS( "90" ) )
                .Map( SYMBOL_ANGLE_180, wxS( "180" ) )
                .Map( SYMBOL_ANGLE_270, wxS( "270" ) );
 
        PROPERTY_MANAGER& propMgr = PROPERTY_MANAGER::Instance();
        REGISTER_TYPE( SCH_SYMBOL );
        propMgr.AddTypeCast( new TYPE_CAST<SCH_SYMBOL, SCH_ITEM> );
        propMgr.InheritsAfter( TYPE_HASH( SCH_SYMBOL ), TYPE_HASH( SYMBOL ) );
        propMgr.InheritsAfter( TYPE_HASH( SCH_SYMBOL ), TYPE_HASH( SCH_ITEM ) );
 
        propMgr.AddProperty( new PROPERTY<SCH_SYMBOL, int>( _HKI( "Position X" ), &SCH_SYMBOL::SetX, &SCH_SYMBOL::GetX,
                                                            PROPERTY_DISPLAY::PT_COORD,
                                                            ORIGIN_TRANSFORMS::ABS_X_COORD ) );
        propMgr.AddProperty( new PROPERTY<SCH_SYMBOL, int>( _HKI( "Position Y" ), &SCH_SYMBOL::SetY, &SCH_SYMBOL::GetY,
                                                            PROPERTY_DISPLAY::PT_COORD,
                                                            ORIGIN_TRANSFORMS::ABS_Y_COORD ) );
 
        propMgr.AddProperty( new PROPERTY_ENUM<SCH_SYMBOL, SYMBOL_ORIENTATION_PROP>(
                _HKI( "Orientation" ), &SCH_SYMBOL::SetOrientationProp, &SCH_SYMBOL::GetOrientationProp ) );
        propMgr.AddProperty( new PROPERTY<SCH_SYMBOL, bool>( _HKI( "Mirror X" ), &SCH_SYMBOL::SetMirrorX,
                                                             &SCH_SYMBOL::GetMirrorX ) );
        propMgr.AddProperty( new PROPERTY<SCH_SYMBOL, bool>( _HKI( "Mirror Y" ), &SCH_SYMBOL::SetMirrorY,
                                                             &SCH_SYMBOL::GetMirrorY ) );
 
        auto hasLibPart = []( INSPECTABLE* aItem ) -> bool
        {
            if( SCH_SYMBOL* symbol = dynamic_cast<SCH_SYMBOL*>( aItem ) )
                return symbol->GetLibSymbolRef() != nullptr;
 
            return false;
        };
 
        propMgr.AddProperty( new PROPERTY<SYMBOL, bool>( _HKI( "Pin numbers" ), &SYMBOL::SetShowPinNumbers,
                                                         &SYMBOL::GetShowPinNumbers ) )
                .SetAvailableFunc( hasLibPart );
 
         propMgr.AddProperty( new PROPERTY<SYMBOL, bool>( _HKI( "Pin names" ), &SYMBOL::SetShowPinNames,
                                                         &SYMBOL::GetShowPinNames ) )
                .SetAvailableFunc( hasLibPart );
 
        const wxString groupFields = _HKI( "Fields" );
 
        propMgr.AddProperty( new PROPERTY<SCH_SYMBOL, wxString>( _HKI( "Reference" ), &SCH_SYMBOL::SetRefProp,
                                                                 &SCH_SYMBOL::GetRefProp ),
                             groupFields );
        propMgr.AddProperty( new PROPERTY<SCH_SYMBOL, wxString>( _HKI( "Value" ), &SCH_SYMBOL::SetValueProp,
                                                                 &SCH_SYMBOL::GetValueProp ),
                             groupFields );
        propMgr.AddProperty( new PROPERTY<SCH_SYMBOL, wxString>( _HKI( "Library Link" ),
                                                                 NO_SETTER( SCH_SYMBOL, wxString ),
                                                                 &SCH_SYMBOL::GetSymbolIDAsString ),
                             groupFields );
        propMgr.AddProperty( new PROPERTY<SCH_SYMBOL, wxString>( _HKI( "Library Description" ),
                                                                 NO_SETTER( SCH_SYMBOL, wxString ),
                                                                 &SCH_SYMBOL::GetDescription ),
                             groupFields );
        propMgr.AddProperty( new PROPERTY<SCH_SYMBOL, wxString>( _HKI( "Keywords" ), NO_SETTER( SCH_SYMBOL, wxString ),
                                                                 &SCH_SYMBOL::GetKeyWords ),
                             groupFields );
 
        auto multiUnit = [=]( INSPECTABLE* aItem ) -> bool
        {
            if( SCH_SYMBOL* symbol = dynamic_cast<SCH_SYMBOL*>( aItem ) )
                return symbol->IsMultiUnit();
 
            return false;
        };
 
        auto multiBodyStyle = [=]( INSPECTABLE* aItem ) -> bool
        {
            if( SCH_SYMBOL* symbol = dynamic_cast<SCH_SYMBOL*>( aItem ) )
                return symbol->IsMultiBodyStyle();
 
            return false;
        };
 
        propMgr.AddProperty( new PROPERTY<SCH_SYMBOL, int>( _HKI( "Unit" ), &SCH_SYMBOL::SetUnitProp,
                                                            &SCH_SYMBOL::GetUnitProp ) )
                .SetAvailableFunc( multiUnit )
                .SetChoicesFunc(
                        []( INSPECTABLE* aItem )
                        {
                            wxPGChoices choices;
 
                            if( SCH_SYMBOL* symbol = dynamic_cast<SCH_SYMBOL*>( aItem ) )
                            {
                                for( int ii = 1; ii <= symbol->GetUnitCount(); ii++ )
                                    choices.Add( symbol->GetUnitDisplayName( ii, false ), ii );
                            }
 
                            return choices;
                        } );
 
        propMgr.AddProperty( new PROPERTY<SCH_SYMBOL, wxString>( _HKI( "Body Style" ), &SCH_SYMBOL::SetBodyStyleProp,
                                                                 &SCH_SYMBOL::GetBodyStyleProp ) )
                .SetAvailableFunc( multiBodyStyle )
                .SetChoicesFunc(
                        []( INSPECTABLE* aItem )
                        {
                            wxPGChoices choices;
 
                            if( SCH_SYMBOL* symbol = dynamic_cast<SCH_SYMBOL*>( aItem ) )
                            {
                                for( int ii = 1; ii <= symbol->GetBodyStyleCount(); ii++ )
                                    choices.Add( symbol->GetBodyStyleDescription( ii, false ) );
                            }
 
                            return choices;
                        } );
 
        const wxString groupAttributes = _HKI( "Attributes" );
 
        propMgr.AddProperty( new PROPERTY<SCH_SYMBOL, bool>( _HKI( "Exclude From Simulation" ),
                                                             &SCH_SYMBOL::SetExcludedFromSimProp,
                                                             &SCH_SYMBOL::GetExcludedFromSimProp ),
                             groupAttributes );
        propMgr.AddProperty( new PROPERTY<SCH_SYMBOL, bool>( _HKI( "Exclude From Bill of Materials" ),
                                                             &SCH_SYMBOL::SetExcludedFromBOMProp,
                                                             &SCH_SYMBOL::GetExcludedFromBOMProp ),
                             groupAttributes );
        propMgr.AddProperty( new PROPERTY<SCH_SYMBOL, bool>( _HKI( "Exclude From Board" ),
                                                             &SCH_SYMBOL::SetExcludedFromBoardProp,
                                                             &SCH_SYMBOL::GetExcludedFromBoardProp ),
                             groupAttributes );
        propMgr.AddProperty( new PROPERTY<SCH_SYMBOL, bool>( _HKI( "Exclude From Position Files" ),
                                                             &SCH_SYMBOL::SetExcludedFromPosFilesProp,
                                                             &SCH_SYMBOL::GetExcludedFromPosFilesProp ),
                             groupAttributes );
        propMgr.AddProperty( new PROPERTY<SCH_SYMBOL, bool>( _HKI( "Do not Populate" ),
                                                             &SCH_SYMBOL::SetDNPProp,
                                                             &SCH_SYMBOL::GetDNPProp ),
                             groupAttributes );
    }
} _SCH_SYMBOL_DESC;
 
 
ENUM_TO_WXANY( SYMBOL_ORIENTATION_PROP )