lib_symbol.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2004-2015 Jean-Pierre Charras, jp.charras at wanadoo.fr
 * Copyright (C) 2008 Wayne Stambaugh <[email protected]>
 * Copyright (C) 2022 CERN
 * 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 "lib_symbol.h"
 
#include <algorithm>
#include <functional>
#include <memory>
#include <unordered_map>
#include <unordered_set>
 
#include <advanced_config.h>
#include <font/outline_font.h>
#include <jumper_group.h>
#include <sch_draw_panel.h>
#include <plotters/plotter.h>
#include <sch_screen.h>
#include <template_fieldnames.h>
#include <transform.h>
#include <settings/color_settings.h>
#include <sch_pin.h>
#include <sch_render_settings.h>
#include <sch_shape.h>
#include <trace_helpers.h>
#include <common.h>
 
#include <api/api_enums.h>
#include <api/api_sch_utils.h>
#include <api/api_utils.h>
#include <api/schematic/schematic_types.pb.h>
 
#include <text_eval/text_eval_wrapper.h>
 
// TODO(JE) remove m_library; shouldn't be needed with legacy remapping
#include <libraries/legacy_symbol_library.h>
 
#include <properties/property.h>
#include <properties/property_mgr.h>
 

static std::shared_ptr<LIB_SYMBOL> GetSafeRootSymbol( const LIB_SYMBOL* aSymbol, const char* aCallerName )
{
    std::set<const LIB_SYMBOL*> visited;
    visited.insert( aSymbol );
 
    std::shared_ptr<LIB_SYMBOL> current = aSymbol->SharedPtr();
    std::shared_ptr<LIB_SYMBOL> parent = aSymbol->GetParent().lock();
 
    while( parent )
    {
        if( visited.count( parent.get() ) )
        {
            // Build chain description for logging
            wxString chain = aSymbol->GetName();
 
            for( const LIB_SYMBOL* sym : visited )
            {
                if( sym != aSymbol )
                    chain += wxT( " -> " ) + sym->GetName();
            }
 
            chain += wxT( " -> " ) + parent->GetName() + wxT( " (CYCLE)" );
 
            wxLogTrace( traceSymbolInheritance,
                        wxT( "%s: Circular inheritance detected in symbol '%s' (lib: %s). Chain: %s" ),
                        aCallerName,
                        aSymbol->GetName(),
                        aSymbol->GetLibId().GetLibNickname().wx_str(),
                        chain );
 
            // Return current (last valid symbol before cycle)
            return current;
        }
 
        visited.insert( parent.get() );
        current = parent;
        parent = parent->GetParent().lock();
    }
 
    return current;
}
 
 
wxString LIB_SYMBOL::getShownDescription( RESOLUTION_CONTEXT aContext, int aDepth ) const
{
    wxString shownText = GetDescriptionField().GetShownText( aContext, aDepth );
 
    if( shownText.IsEmpty() && IsDerived() )
    {
        std::shared_ptr<LIB_SYMBOL> root = GetSafeRootSymbol( this, __FUNCTION__ );
 
        if( root.get() != this )
            shownText = root->GetDescriptionField().GetShownText( aContext, aDepth );
    }
 
    return shownText;
}
 
 
wxString LIB_SYMBOL::GetShownDescription( RESOLUTION_CONTEXT aContext, int aDepth ) const
{
    if( aContext == FOR_GUI )
    {
        if( m_cachesDirty )
            rebuildCaches();
 
        return m_shownDescriptionCache;
    }
 
    return getShownDescription( aContext, aDepth );
}
 
 
void LIB_SYMBOL::rebuildCaches() const
{
    m_cachesDirty = false;
 
    //
    // m_shownDescriptionCache
    //
    m_shownDescriptionCache = getShownDescription( FOR_GUI, 0 );
 
    //
    // m_chooserFieldsCache
    //
    m_chooserFieldsCache.clear();
 
    for( const SCH_ITEM& item : m_drawings[SCH_FIELD_T] )
    {
        const SCH_FIELD* field = static_cast<const SCH_FIELD*>( &item );
 
        if( field->ShowInChooser() )
            m_chooserFieldsCache[field->GetName()] = field->EDA_TEXT::GetShownText( FOR_GUI );
    }
 
    // If the user has a field named "Keywords", then prefer that.  Otherwise add the KiCad
    // keywords.
    const wxString localizedKeywords = _( "Keywords" );
 
    if( !m_chooserFieldsCache.contains( localizedKeywords ) )
        m_chooserFieldsCache[localizedKeywords] = GetShownKeyWords( FOR_GUI );
 
    //
    // m_pinCountCache
    //
    m_pinCountCache = 0;
 
    for( SCH_PIN* pin : GetGraphicalPins( 0 /* all units */, 1 /* single body style */ ) )
    {
        int pinCount = pin->GetStackedPinCount();
        m_pinCountCache += pinCount;
    }
 
    //
    // m_searchTermsCache
    //
    m_searchTermsCache.clear();
    m_searchTermsCache.reserve( 6 );
 
    // Order matters, see SEARCH_TERM_CACHE_INDEX
    m_searchTermsCache.emplace_back( SEARCH_TERM( GetLibNickname(), 4 ) );
    m_searchTermsCache.emplace_back( SEARCH_TERM( GetName(), 8, true ) );
    m_searchTermsCache.emplace_back( SEARCH_TERM( GetLIB_ID().Format(), 16, true ) );
 
    wxStringTokenizer keywordTokenizer( GetShownKeyWords( FOR_GUI ), " \t\r\n", wxTOKEN_STRTOK );
 
    while( keywordTokenizer.HasMoreTokens() )
        m_searchTermsCache.emplace_back( SEARCH_TERM( keywordTokenizer.GetNextToken(), 4 ) );
 
    // Also include keywords as one long string, just in case
    m_searchTermsCache.emplace_back( SEARCH_TERM( GetShownKeyWords( FOR_GUI ), 1 ) );
    m_searchTermsCache.emplace_back( SEARCH_TERM( GetShownDescription( FOR_GUI ), 1 ) );
 
    // Add relational term for unit count
    m_searchTermsCache.emplace_back( SEARCH_TERM( wxString::Format( wxT( "units=%d" ), GetUnitCount() ), 1 ) );
 
    wxString footprint = GetFootprint();
 
    if( !footprint.IsEmpty() )
        m_searchTermsCache.emplace_back( SEARCH_TERM( footprint, 1 ) );
}
 
 
void LIB_SYMBOL::SetDescription( const wxString& aDescription )
{
    GetDescriptionField().SetText( aDescription );
    m_cachesDirty = true;
}
 
 
void LIB_SYMBOL::SetKeyWords( const wxString& aKeyWords )
{
    m_keyWords = aKeyWords;
    m_cachesDirty = true;
}
 
 
wxString LIB_SYMBOL::GetShownKeyWords( RESOLUTION_CONTEXT aContext, int aDepth ) const
{
    if( aContext == RAW_VALUE )
        return GetKeyWords();
 
    wxString text = GetKeyWords();
 
    std::function<bool( wxString* )> libSymbolResolver =
            [&]( wxString* token ) -> bool
            {
                return ResolveTextVar( token, aDepth + 1 );
            };
 
    text = ResolveTextVars( text, &libSymbolResolver, aDepth );
 
    return text;
}
 
 
std::vector<SEARCH_TERM>& LIB_SYMBOL::GetSearchTerms()
{
    if( m_cachesDirty )
        rebuildCaches();
 
    return m_searchTermsCache;
}
 
 
void LIB_SYMBOL::GetChooserFields( std::map<wxString, wxString>& aColumnMap )
{
    if( m_cachesDirty )
        rebuildCaches();
 
    aColumnMap = m_chooserFieldsCache;
}
 
 
bool operator<( const LIB_SYMBOL& aItem1, const LIB_SYMBOL& aItem2 )
{
    return aItem1.GetName() < aItem2.GetName();
}
 

struct null_deleter
{
    void operator()( void const* ) const {}
};
 
 
LIB_SYMBOL::LIB_SYMBOL( const wxString& aName, LIB_SYMBOL* aParent, LEGACY_SYMBOL_LIB* aLibrary ) :
        SYMBOL( LIB_SYMBOL_T ),
        m_me( this, null_deleter() )
{
    m_lastModDate = 0;
    m_unitCount = 1;
    m_demorgan = false;
    m_pinNameOffset = schIUScale.MilsToIU( DEFAULT_PIN_NAME_OFFSET );
    m_options = ENTRY_NORMAL;
    m_unitsLocked = false;
    m_duplicatePinNumbersAreJumpers = false;
    m_library = nullptr;
 
    auto addField =
            [&]( FIELD_T id, bool visible )
            {
                SCH_FIELD* field = new SCH_FIELD( this, id );
                field->SetVisible( visible );
                m_drawings[SCH_FIELD_T].push_back( field );
            };
 
    // construct only the mandatory fields
    addField( FIELD_T::REFERENCE, true );
    addField( FIELD_T::VALUE, true );
    addField( FIELD_T::FOOTPRINT, false );
    addField( FIELD_T::DATASHEET, false );
    addField( FIELD_T::DESCRIPTION, false );
 
    SetName( aName );
    SetParent( aParent );
    SetLib( aLibrary );
 
    m_cachesDirty = true;
}
 
 
LIB_SYMBOL::LIB_SYMBOL( const LIB_SYMBOL& aSymbol, LEGACY_SYMBOL_LIB* aLibrary, bool aCopyEmbeddedFiles ) :
        SYMBOL( aSymbol ),
        EMBEDDED_FILES( aSymbol, aCopyEmbeddedFiles ),
        m_me( this, null_deleter() )
{
    m_library = aLibrary;
    m_name = aSymbol.m_name;
    m_fpFilters = wxArrayString( aSymbol.m_fpFilters );
    m_pinMaps = aSymbol.m_pinMaps;
    m_associatedFootprints = aSymbol.m_associatedFootprints;
    m_unitCount = aSymbol.m_unitCount;
    m_demorgan = aSymbol.m_demorgan;
    m_unitsLocked = aSymbol.m_unitsLocked;
    m_lastModDate = aSymbol.m_lastModDate;
    m_options = aSymbol.m_options;
    m_libId = aSymbol.m_libId;
    m_keyWords = aSymbol.m_keyWords;
 
    m_jumperPinGroups = aSymbol.m_jumperPinGroups;
    m_duplicatePinNumbersAreJumpers = aSymbol.m_duplicatePinNumbersAreJumpers;
 
    m_unitDisplayNames = aSymbol.GetUnitDisplayNames();
    // Raw member, not the accessor, which would bake a root's body styles into a derived copy
    m_bodyStyleNames = aSymbol.m_bodyStyleNames;
 
    ClearSelected();
 
    for( const SCH_ITEM& oldItem : aSymbol.m_drawings )
    {
        if( ( oldItem.GetFlags() & ( IS_NEW | STRUCT_DELETED ) ) != 0 )
            continue;
 
        try
        {
            SCH_ITEM* newItem = (SCH_ITEM*) oldItem.Clone();
            newItem->ClearSelected();
            newItem->SetParent( this );
            m_drawings.push_back( newItem );
        }
        catch( ... )
        {
            wxFAIL_MSG( "Failed to clone SCH_ITEM." );
            return;
        }
    }
 
    SetParent( aSymbol.m_parent.lock().get() );
    m_cachesDirty = true;
}
 
 
void LIB_SYMBOL::Serialize( kiapi::schematic::types::SchematicSymbol& aOutput, bool aSkipPins ) const
{
    using namespace kiapi::common;
    using namespace kiapi::schematic::types;
 
    SchematicSymbol& def = aOutput;
    def.Clear();
    PackLibId( def.mutable_id(), m_libId );
 
    SchematicSymbolType symbolType = SchematicSymbolType::SST_NORMAL;
 
    if( IsGlobalPower() )
        symbolType = SchematicSymbolType::SST_GLOBAL_POWER;
    else if( IsLocalPower() )
        symbolType = SchematicSymbolType::SST_LOCAL_POWER;
 
    def.set_type( symbolType );
 
    SchematicSymbolAttributes* attributes = def.mutable_attributes();
    attributes->set_exclude_from_simulation( GetExcludedFromSim() );
    attributes->set_exclude_from_bill_of_materials( GetExcludedFromBOM() );
    attributes->set_exclude_from_board( GetExcludedFromBoard() );
    attributes->set_exclude_from_position_files( GetExcludedFromPosFiles() );
    attributes->set_do_not_populate( GetDNP() );
 
    GetField( FIELD_T::REFERENCE )->Serialize( *def.mutable_reference_field(), schIUScale );
    GetField( FIELD_T::VALUE )->Serialize( *def.mutable_value_field(), schIUScale );
    GetField( FIELD_T::FOOTPRINT )->Serialize( *def.mutable_footprint_field(), schIUScale );
    GetField( FIELD_T::DATASHEET )->Serialize( *def.mutable_datasheet_field(), schIUScale );
    GetField( FIELD_T::DESCRIPTION )->Serialize( *def.mutable_description_field(), schIUScale );
 
    for( const SCH_ITEM& drawItem : GetDrawItems() )
    {
        if( drawItem.Type() == SCH_FIELD_T && static_cast<const SCH_FIELD&>( drawItem ).IsMandatory() )
            continue;
 
        if( aSkipPins && 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( GetUnitCount() );
 
    for( int bodyStyle = BODY_STYLE::BASE; bodyStyle <= GetBodyStyleCount(); ++bodyStyle )
        def.add_body_style()->set_name( GetBodyStyleDescription( bodyStyle, false ).ToUTF8() );
 
    def.set_keywords( GetKeyWords().ToUTF8() );
 
    for( const wxString& filter : GetFPFilters() )
        def.add_footprint_filters( filter.ToUTF8() );
 
    JumperSettings* jumpers = def.mutable_jumpers();
    jumpers->set_duplicate_names_are_jumpered( GetDuplicatePinNumbersAreJumpers() );
 
    for( const JUMPER_GROUP& group : JumperPinGroups().GetAll() )
    {
        JumperGroup* jumperGroup = jumpers->add_groups();
 
        for( const wxString& pinNumber : group.GetNames() )
            jumperGroup->add_pin_numbers( pinNumber.ToUTF8() );
    }
 
    def.set_units_locked( UnitsLocked() );
    def.set_embedded_fonts( GetAreFontsEmbedded() );
    def.set_show_pin_numbers( GetShowPinNumbers() );
    def.set_show_pin_names( GetShowPinNames() );
    PackDistance( *def.mutable_pin_name_offset(), GetPinNameOffset(), schIUScale );
 
    for( const auto& [unit, displayName] : GetUnitDisplayNames() )
    {
        SchematicUnitDisplayName* protoName = def.add_unit_display_names();
        protoName->set_unit( unit );
        protoName->set_name( displayName.ToUTF8() );
    }
 
    SymbolPinMaps* pinMaps = def.mutable_pin_maps();
 
    for( const ASSOCIATED_FOOTPRINT& assoc : GetEffectiveAssociatedFootprints() )
    {
        AssociatedFootprint* a = pinMaps->add_associated_footprints();
        PackLibId( a->mutable_footprint(), assoc.m_FootprintLibId );
        a->set_map_name( assoc.m_MapName.ToUTF8() );
    }
 
    for( const PIN_MAP& map : GetEffectivePinMaps().GetAll() )
    {
        PinMap* m = pinMaps->add_pin_maps();
        m->set_name( map.GetName().ToUTF8() );
 
        for( const PIN_MAP_ENTRY& entry : map.GetEntries() )
        {
            PinMapEntry* e = m->add_entries();
            e->set_pin_number( entry.m_PinNumber.ToUTF8() );
            e->set_pad_number( entry.m_PadNumber.ToUTF8() );
        }
    }
}
 
 
void LIB_SYMBOL::Serialize( google::protobuf::Any& aContainer ) const
{
    kiapi::schematic::types::SchematicSymbol def;
    Serialize( def );
    aContainer.PackFrom( def );
}
 
 
bool LIB_SYMBOL::Deserialize( const kiapi::schematic::types::SchematicSymbol& aInput )
{
    using namespace kiapi::common;
    using namespace kiapi::common::types;
    using namespace kiapi::schematic::types;
 
    const SchematicSymbol& def = aInput;
 
    LIB_ID libId = UnpackLibId( def.id() );
    SetLibId( libId );
 
    switch( def.type() )
    {
    case SchematicSymbolType::SST_GLOBAL_POWER: SetGlobalPower(); break;
    case SchematicSymbolType::SST_LOCAL_POWER:  SetLocalPower();  break;
    default: break;
    }
 
    if( def.has_attributes() )
    {
        SetExcludedFromSim( def.attributes().exclude_from_simulation() );
        SetExcludedFromBOM( def.attributes().exclude_from_bill_of_materials() );
        SetExcludedFromBoard( def.attributes().exclude_from_board() );
        SetExcludedFromPosFiles( def.attributes().exclude_from_position_files() );
        SetDNP( def.attributes().do_not_populate() );
    }
 
    GetField( FIELD_T::REFERENCE )->Deserialize( def.reference_field(), schIUScale );
    GetField( FIELD_T::VALUE )->Deserialize( def.value_field(), schIUScale );
    GetField( FIELD_T::FOOTPRINT )->Deserialize( def.footprint_field(), schIUScale );
    GetField( FIELD_T::DATASHEET )->Deserialize( def.datasheet_field(), schIUScale );
    GetField( FIELD_T::DESCRIPTION )->Deserialize( def.description_field(), schIUScale );
 
    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, this );
 
        if( !item || !item->Deserialize( child.item() ) )
            continue;
 
        SCH_ITEM* schItem = static_cast<SCH_ITEM*>( item.release() );
 
        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() );
        AddDrawItem( schItem, false );
    }
 
    if( def.unit_count() > 0 )
        SetUnitCount( def.unit_count(), false );
 
    if( def.body_style_size() > 0 )
    {
        std::vector<wxString> bodyStyleNames;
 
        for( const SchematicBodyStyle& bodyStyle : def.body_style() )
            bodyStyleNames.emplace_back( wxString::FromUTF8( bodyStyle.name() ) );
 
        SetBodyStyleNames( bodyStyleNames );
        SetBodyStyleCount( static_cast<int>( bodyStyleNames.size() ), false, false );
    }
 
    if( !def.keywords().empty() )
        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 ) );
 
        SetFPFilters( filters );
    }
 
    SetDuplicatePinNumbersAreJumpers( def.jumpers().duplicate_names_are_jumpered() );
 
    JUMPER_GROUP_SET& jumperGroups = JumperPinGroups();
    jumperGroups.Clear();
 
    for( const JumperGroup& group : def.jumpers().groups() )
    {
        std::set<wxString> pinNumbers;
 
        for( const std::string& pinNumber : group.pin_numbers() )
            pinNumbers.insert( wxString::FromUTF8( pinNumber ) );
 
        jumperGroups.Add( std::move( pinNumbers ) );
    }
 
    LockUnits( def.units_locked() );
    SetAreFontsEmbedded( def.embedded_fonts() );
 
    for( const SchematicUnitDisplayName& displayName : def.unit_display_names() )
        GetUnitDisplayNames()[displayName.unit()] = wxString::FromUTF8( displayName.name() );
 
    SetShowPinNumbers( def.show_pin_numbers() );
    SetShowPinNames( def.show_pin_names() );
    SetPinNameOffset( UnpackDistance( def.pin_name_offset(), schIUScale ) );
 
    if( def.has_pin_maps() )
    {
        PIN_MAP_SET pinMapSet;
 
        for( const PinMap& map : def.pin_maps().pin_maps() )
        {
            PIN_MAP pinMap( wxString::FromUTF8( map.name() ) );
 
            for( const PinMapEntry& entry : map.entries() )
            {
                pinMap.SetEntry( wxString::FromUTF8( entry.pin_number() ), wxString::FromUTF8( entry.pad_number() ) );
            }
 
            pinMapSet.AddOrReplace( std::move( pinMap ) );
        }
 
        std::vector<ASSOCIATED_FOOTPRINT> associatedFootprints;
 
        for( const AssociatedFootprint& footprint : def.pin_maps().associated_footprints() )
        {
            ASSOCIATED_FOOTPRINT assoc;
            assoc.m_FootprintLibId = UnpackLibId( footprint.footprint() );
            assoc.m_MapName = wxString::FromUTF8( footprint.map_name() );
            associatedFootprints.push_back( std::move( assoc ) );
        }
 
        SetPinMaps( pinMapSet );
        SetAssociatedFootprints( std::move( associatedFootprints ) );
    }
 
    m_cachesDirty = true;
    return true;
}
 
 
bool LIB_SYMBOL::Deserialize( const google::protobuf::Any& aContainer )
{
    kiapi::schematic::types::SchematicSymbol def;
 
    if( !aContainer.UnpackTo( &def ) )
        return false;
 
    return Deserialize( def );
}
 
 
const LIB_SYMBOL& LIB_SYMBOL::operator=( const LIB_SYMBOL& aSymbol )
{
    if( &aSymbol == this )
        return aSymbol;
 
    SYMBOL::operator=( aSymbol );
 
    m_library = aSymbol.m_library;
    m_name = aSymbol.m_name;
    m_fpFilters = wxArrayString( aSymbol.m_fpFilters );
    m_pinMaps = aSymbol.m_pinMaps;
    m_associatedFootprints = aSymbol.m_associatedFootprints;
    m_unitCount = aSymbol.m_unitCount;
    m_demorgan = aSymbol.m_demorgan;
    m_unitsLocked = aSymbol.m_unitsLocked;
    m_lastModDate = aSymbol.m_lastModDate;
    m_options = aSymbol.m_options;
    m_libId = aSymbol.m_libId;
    m_keyWords = aSymbol.m_keyWords;
 
    m_jumperPinGroups = aSymbol.m_jumperPinGroups;
    m_duplicatePinNumbersAreJumpers = aSymbol.m_duplicatePinNumbersAreJumpers;
 
    m_unitDisplayNames = aSymbol.GetUnitDisplayNames();
    // Raw member, not the accessor, which would bake a root's body styles into a derived copy
    m_bodyStyleNames = aSymbol.m_bodyStyleNames;
 
    m_drawings.clear();
 
    for( const SCH_ITEM& oldItem : aSymbol.m_drawings )
    {
        if( ( oldItem.GetFlags() & ( IS_NEW | STRUCT_DELETED ) ) != 0 )
            continue;
 
        SCH_ITEM* newItem = (SCH_ITEM*) oldItem.Clone();
        newItem->SetParent( this );
        m_drawings.push_back( newItem );
    }
 
    m_drawings.sort();
 
    SetParent( aSymbol.m_parent.lock().get() );
 
    EMBEDDED_FILES::operator=( aSymbol );
 
    m_cachesDirty = true;
 
    return *this;
}
 

LIB_SYMBOL* LIB_SYMBOL::GetDummy()
{
    static LIB_SYMBOL* symbol;
 
    if( !symbol )
    {
        symbol = new LIB_SYMBOL( wxEmptyString );
 
        SCH_SHAPE* square = new SCH_SHAPE( SHAPE_T::RECTANGLE, LAYER_DEVICE );
 
        square->SetPosition( VECTOR2I( schIUScale.MilsToIU( -200 ), schIUScale.MilsToIU( 200 ) ) );
        square->SetEnd( VECTOR2I( schIUScale.MilsToIU( 200 ), schIUScale.MilsToIU( -200 ) ) );
        symbol->AddDrawItem( square );
 
        SCH_TEXT* text = new SCH_TEXT( { 0, 0 }, wxT( "??" ), LAYER_DEVICE );
 
        text->SetTextSize( VECTOR2I( schIUScale.MilsToIU( 150 ), schIUScale.MilsToIU( 150 ) ) );
        symbol->AddDrawItem( text );
    }
 
    return symbol;
}
 
 
unsigned LIB_SYMBOL::GetInheritanceDepth() const
{
    unsigned depth = 0;
    std::set<const LIB_SYMBOL*> visited;
    visited.insert( this );
 
    std::shared_ptr<LIB_SYMBOL> parent = m_parent.lock();
 
    while( parent )
    {
        // Cycle detected - parent chain points back to an already visited symbol
        if( visited.count( parent.get() ) )
        {
            wxLogTrace( traceSymbolInheritance,
                        wxT( "GetInheritanceDepth: Circular inheritance detected in symbol '%s' "
                             "(lib: %s)" ),
                        m_name, m_libId.GetLibNickname().wx_str() );
            break;
        }
 
        visited.insert( parent.get() );
        depth++;
        parent = parent->m_parent.lock();
    }
 
    return depth;
}
 
 
std::shared_ptr<LIB_SYMBOL> LIB_SYMBOL::GetRootSymbol() const
{
    std::set<const LIB_SYMBOL*> visited;
    visited.insert( this );
 
    std::shared_ptr<LIB_SYMBOL> current = m_me;
    std::shared_ptr<LIB_SYMBOL> parent = m_parent.lock();
 
    while( parent )
    {
        // Cycle detected - parent chain points back to an already visited symbol
        if( visited.count( parent.get() ) )
        {
            wxLogTrace( traceSymbolInheritance,
                        wxT( "GetRootSymbol: Circular inheritance detected in symbol '%s' "
                             "(lib: %s)" ),
                        m_name, m_libId.GetLibNickname().wx_str() );
            break;
        }
 
        visited.insert( parent.get() );
        current = parent;
        parent = parent->m_parent.lock();
    }
 
    return current;
}
 
 
bool LIB_SYMBOL::UnitsLocked() const
{
    if( IsDerived() )
    {
        std::shared_ptr<LIB_SYMBOL> root = GetSafeRootSymbol( this, __FUNCTION__ );
 
        if( root.get() != this )
            return root->m_unitsLocked;
    }
 
    return m_unitsLocked;
}
 
 
wxString LIB_SYMBOL::GetUnitDisplayName( int aUnit, bool aLabel ) const
{
    const LIB_SYMBOL*           owner = this;
    std::shared_ptr<LIB_SYMBOL> root;
 
    if( IsDerived() )
    {
        root = GetSafeRootSymbol( this, __FUNCTION__ );
        owner = root.get();
    }
 
    if( owner->m_unitDisplayNames.contains( aUnit ) )
        return owner->m_unitDisplayNames.at( aUnit );
    else if( aLabel )
        return wxString::Format( _( "Unit %s" ), LIB_SYMBOL::LetterSubReference( aUnit, 'A' ) );
    else
        return LIB_SYMBOL::LetterSubReference( aUnit, 'A' );
}
 
 
wxString LIB_SYMBOL::GetBodyStyleDescription( int aBodyStyle, bool aLabel ) const
{
    if( HasDeMorganBodyStyles() )
    {
        if( aBodyStyle == BODY_STYLE::DEMORGAN )
            return aLabel ? _( "Alternate" ) : wxString( _HKI( "Alternate" ) );
        else if( aBodyStyle == BODY_STYLE::BASE )
            return aLabel ? _( "Standard" ) : wxString( _HKI( "Standard" ) );
    }
    else if( IsMultiBodyStyle() )
    {
        const std::vector<wxString>& names = GetBodyStyleNames();
 
        // Draw items common to every body style carry a body style of 0
        if( aBodyStyle >= BODY_STYLE::BASE && aBodyStyle <= (int) names.size() )
            return names[aBodyStyle - 1];
    }
 
    return wxT( "?" );
}
 
 
void LIB_SYMBOL::SetName( const wxString& aName )
{
    m_name = aName;
    m_libId.SetLibItemName( aName );
 
    m_cachesDirty = true;
}
 
 
void LIB_SYMBOL::SetLibId( const LIB_ID& aLibId )
{
    m_libId = aLibId;
 
    m_cachesDirty = true;
}
 
 
void LIB_SYMBOL::SetParent( LIB_SYMBOL* aParent )
{
    if( aParent )
    {
        // Prevent circular inheritance by checking if aParent is derived from this symbol
        std::set<const LIB_SYMBOL*> visited;
        visited.insert( this );
 
        std::shared_ptr<LIB_SYMBOL> ancestor = aParent->SharedPtr();
 
        while( ancestor )
        {
            if( visited.count( ancestor.get() ) )
            {
                wxLogTrace( traceSymbolInheritance, wxT( "SetParent: Rejecting parent '%s' for symbol '%s' "
                                                         "- would create circular inheritance (lib: %s)" ),
                            aParent->GetName(), m_name, m_libId.GetLibNickname().wx_str() );
 
                // Don't set the parent - it would create circular inheritance
                return;
            }
 
            visited.insert( ancestor.get() );
            ancestor = ancestor->m_parent.lock();
        }
 
        m_parent = aParent->SharedPtr();
 
        // Keep the recorded parent name in sync so serialization never has to dereference the live
        // parent pointer (which can dangle, see SCH_IO_KICAD_SEXPR_LIB_CACHE::SaveSymbol).
        m_parentName = aParent->GetName();
    }
    else
    {
        // Only drop the live pointer. The recorded parent name is left untouched so a derived
        // symbol whose live parent has been lost can still be serialized by name.
        m_parent.reset();
    }
 
    m_cachesDirty = true;
}
 
 
wxString LIB_SYMBOL::GetFootprint() const
{
    if( !GetField( FIELD_T::FOOTPRINT ) )
        return wxEmptyString;
 
    return GetFootprintField().GetShownText( INTERNAL );
}
 
 
std::unique_ptr<LIB_SYMBOL> LIB_SYMBOL::Flatten() const
{
    std::unique_ptr<LIB_SYMBOL> retv;
 
    if( IsDerived() )
    {
        // Build parent chain with cycle detection - collect from this symbol up to root
        std::vector<const LIB_SYMBOL*> parentChain;
        std::set<const LIB_SYMBOL*> visited;
        visited.insert( this );
 
        std::shared_ptr<LIB_SYMBOL> parent = m_parent.lock();
 
        wxCHECK_MSG( parent, retv, wxString::Format( "Parent of derived symbol '%s' undefined", m_name ) );
 
        while( parent )
        {
            // Cycle detected - parent chain points back to an already visited symbol
            if( visited.count( parent.get() ) )
            {
                wxLogTrace( traceSymbolInheritance,
                            wxT( "Flatten: Circular inheritance detected in symbol '%s' (lib: %s)" ),
                            m_name, m_libId.GetLibNickname().wx_str() );
                break;
            }
 
            visited.insert( parent.get() );
            parentChain.push_back( parent.get() );
            parent = parent->m_parent.lock();
        }
 
        // Start with the root (last in chain) and work down
        if( !parentChain.empty() )
        {
            retv = std::make_unique<LIB_SYMBOL>( *parentChain.back() );
 
            // Apply each derived symbol's overrides from root down (skip the root itself)
            for( int i = static_cast<int>( parentChain.size() ) - 2; i >= 0; --i )
            {
                const LIB_SYMBOL* derived = parentChain[i];
 
                // Overwrite parent's mandatory fields for fields which are defined in derived.
                for( FIELD_T fieldId : MANDATORY_FIELDS )
                {
                    if( !derived->GetField( fieldId )->GetText().IsEmpty() )
                        *retv->GetField( fieldId ) = *derived->GetField( fieldId );
                }
 
                // Grab all the rest of derived symbol fields.
                for( const SCH_ITEM& item : derived->m_drawings[SCH_FIELD_T] )
                {
                    const SCH_FIELD* field = static_cast<const SCH_FIELD*>( &item );
 
                    if( field->IsMandatory() )
                        continue;
 
                    SCH_FIELD* newField = new SCH_FIELD( *field );
                    newField->SetParent( retv.get() );
 
                    SCH_FIELD* parentField = retv->GetField( field->GetName() );
 
                    if( !parentField )
                    {
                        retv->AddDrawItem( newField );
                    }
                    else
                    {
                        retv->RemoveDrawItem( parentField );
                        retv->AddDrawItem( newField );
                    }
                }
 
                if( !derived->m_keyWords.IsEmpty() )
                    retv->SetKeyWords( derived->m_keyWords );
 
                if( !derived->m_fpFilters.IsEmpty() )
                    retv->SetFPFilters( derived->m_fpFilters );
            }
        }
        else
        {
            // Cycle detected at immediate parent level - just copy this symbol
            retv = std::make_unique<LIB_SYMBOL>( *this );
            retv->m_parent.reset();
            return retv;
        }
 
        // Now apply this symbol's overrides (the original "this" symbol)
        retv->m_name = m_name;
        retv->SetLibId( m_libId );
 
        // Overwrite parent's mandatory fields for fields which are defined in this.
        for( FIELD_T fieldId : MANDATORY_FIELDS )
        {
            if( !GetField( fieldId )->GetText().IsEmpty() )
                *retv->GetField( fieldId ) = *GetField( fieldId );
        }
 
        // Grab all the rest of derived symbol fields.
        for( const SCH_ITEM& item : m_drawings[SCH_FIELD_T] )
        {
            const SCH_FIELD* field = static_cast<const SCH_FIELD*>( &item );
 
            // Mandatory fields were already resolved.
            if( field->IsMandatory() )
                continue;
 
            SCH_FIELD* newField = new SCH_FIELD( *field );
            newField->SetParent( retv.get() );
 
            SCH_FIELD* parentField = retv->GetField( field->GetName() );
 
            if( !parentField ) // Derived symbol field does not exist in parent symbol.
            {
                retv->AddDrawItem( newField );
            }
            else // Derived symbol field overrides the parent symbol field.
            {
                retv->RemoveDrawItem( parentField );
                retv->AddDrawItem( newField );
            }
        }
 
        // Use this symbol's keywords/filters if set, otherwise keep inherited ones
        if( !m_keyWords.IsEmpty() )
            retv->SetKeyWords( m_keyWords );
 
        if( !m_fpFilters.IsEmpty() )
            retv->SetFPFilters( m_fpFilters );
 
        // Copying the embedded files needs to go in the other direction.  AddFile() silently
        // drops collisions, so the most relevant symbol ("this") must go first, followed by
        // parents up the chain to the root.
        {
            for( const auto& [name, file] : EmbeddedFileMap() )
            {
                EMBEDDED_FILES::EMBEDDED_FILE* newFile = new EMBEDDED_FILES::EMBEDDED_FILE( *file );
                retv->AddFile( newFile );
            }
 
            for( const LIB_SYMBOL* ancestor : parentChain )
            {
                for( const auto& [name, file] : ancestor->EmbeddedFileMap() )
                {
                    EMBEDDED_FILES::EMBEDDED_FILE* newFile = new EMBEDDED_FILES::EMBEDDED_FILE( *file );
                    retv->AddFile( newFile );
                }
            }
        }
 
        // Get excluded flags from the top-level parent (back of the chain).  Derived symbols
        // aren't allowed to change the exclusion flags.
        if( !parentChain.empty() )
        {
            retv->SetExcludedFromSim( parentChain.back()->GetExcludedFromSim() );
            retv->SetExcludedFromBOM( parentChain.back()->GetExcludedFromBOM() );
            retv->SetExcludedFromBoard( parentChain.back()->GetExcludedFromBoard() );
            retv->SetExcludedFromPosFiles( parentChain.back()->GetExcludedFromPosFiles() );
        }
 
        // Pin maps and associated footprints inherit as a coupled bundle; copy the resolved
        // effective bundle so the flattened symbol is self-contained.
        retv->m_pinMaps = GetEffectivePinMaps();
        retv->m_associatedFootprints = GetEffectiveAssociatedFootprints();
 
        retv->m_cachesDirty = true;
        retv->m_parent.reset();
    }
    else
    {
        retv = std::make_unique<LIB_SYMBOL>( *this );
    }
 
    return retv;
}
 
 
void LIB_SYMBOL::SetLib( LEGACY_SYMBOL_LIB* aLibrary )
{
    m_library = aLibrary;
 
    m_cachesDirty = true;
}
 
 
const wxString LIB_SYMBOL::GetLibraryName() const
{
    if( m_library )
        return m_library->GetName();
 
    return m_libId.GetLibNickname();
}
 
 
bool LIB_SYMBOL::IsLocalPower() const
{
    if( IsDerived() )
    {
        std::shared_ptr<LIB_SYMBOL> root = GetSafeRootSymbol( this, __FUNCTION__ );
 
        if( root.get() != this )
            return root->IsLocalPower();
    }
 
    return m_options == ENTRY_LOCAL_POWER;
}
 
 
void LIB_SYMBOL::SetLocalPower()
{
    if( IsDerived() )
    {
        std::shared_ptr<LIB_SYMBOL> root = GetSafeRootSymbol( this, __FUNCTION__ );
 
        if( root.get() != this )
        {
            root->SetLocalPower();
            return;
        }
    }
 
    m_options = ENTRY_LOCAL_POWER;
 
    m_cachesDirty = true;
}
 
 
bool LIB_SYMBOL::IsGlobalPower() const
{
    if( IsDerived() )
    {
        std::shared_ptr<LIB_SYMBOL> root = GetSafeRootSymbol( this, __FUNCTION__ );
 
        if( root.get() != this )
            return root->IsGlobalPower();
    }
 
    return m_options == ENTRY_GLOBAL_POWER;
}
 
 
bool LIB_SYMBOL::IsPower() const
{
    return IsLocalPower() || IsGlobalPower();
}
 
 
void LIB_SYMBOL::SetGlobalPower()
{
    if( IsDerived() )
    {
        std::shared_ptr<LIB_SYMBOL> root = GetSafeRootSymbol( this, __FUNCTION__ );
 
        if( root.get() != this )
        {
            root->SetGlobalPower();
            return;
        }
    }
 
    m_options = ENTRY_GLOBAL_POWER;
 
    m_cachesDirty = true;
}
 
 
bool LIB_SYMBOL::IsNormal() const
{
    if( IsDerived() )
    {
        std::shared_ptr<LIB_SYMBOL> root = GetSafeRootSymbol( this, __FUNCTION__ );
 
        if( root.get() != this )
            return root->IsNormal();
    }
 
    return m_options == ENTRY_NORMAL;
}
 
 
void LIB_SYMBOL::SetNormal()
{
    if( IsDerived() )
    {
        std::shared_ptr<LIB_SYMBOL> root = GetSafeRootSymbol( this, __FUNCTION__ );
 
        if( root.get() != this )
        {
            root->SetNormal();
            return;
        }
    }
 
    m_options = ENTRY_NORMAL;
 
    m_cachesDirty = true;
}
 
 
wxString LIB_SYMBOL::LetterSubReference( int aUnit, wxChar aInitialLetter )
{
    // use letters as notation. To allow more than 26 units, the sub ref
    // use one letter if letter = A .. Z or a ... z, and 2 letters otherwise
    // first letter is expected to be 'A' or 'a' (i.e. 26 letters are available)
    int      u;
    wxString suffix;
 
    do
    {
        u = ( aUnit - 1 ) % 26;
        suffix = wxChar( aInitialLetter + u ) + suffix;
        aUnit = ( aUnit - u ) / 26;
    } while( aUnit > 0 );
 
    return suffix;
}
 
 
bool LIB_SYMBOL::ResolveTextVar( wxString* token, int aDepth ) const
{
    wxString footprint;
 
    for( const SCH_ITEM& item : m_drawings )
    {
        if( item.Type() == SCH_FIELD_T )
        {
            const SCH_FIELD& field = static_cast<const SCH_FIELD&>( item );
 
            if( field.GetId() == FIELD_T::FOOTPRINT )
                footprint = field.GetShownText( nullptr, INTERNAL, wxEmptyString, aDepth + 1 );
 
            if( token->IsSameAs( field.GetUntranslatedName().Upper() ) || token->IsSameAs( field.GetName(), false ) )
            {
                *token = field.GetShownText( nullptr, INTERNAL, wxEmptyString, 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;
    }
 
    if( token->IsSameAs( wxT( "FOOTPRINT_LIBRARY" ) ) )
    {
        wxArrayString parts = wxSplit( footprint, ':' );
 
        if( parts.Count() > 0 )
            *token = parts[0];
        else
            *token = wxEmptyString;
 
        return true;
    }
    else if( token->IsSameAs( wxT( "FOOTPRINT_NAME" ) ) )
    {
        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( "SYMBOL_LIBRARY" ) ) )
    {
        *token = m_libId.GetUniStringLibNickname();
        return true;
    }
    else if( token->IsSameAs( wxT( "SYMBOL_NAME" ) ) )
    {
        *token = m_libId.GetUniStringLibItemName();
        return true;
    }
    else if( token->IsSameAs( wxT( "SYMBOL_PARENT" ) ) )
    {
        std::shared_ptr<LIB_SYMBOL> parent = GetParent().lock();
        *token = parent ? parent->GetName() : wxString();
        return true;
    }
    else if( token->IsSameAs( wxT( "SYMBOL_ROOT" ) ) )
    {
        std::shared_ptr<LIB_SYMBOL> root = GetRootSymbol();
        *token = root ? root->GetName() : GetName();
        return true;
    }
    else if( token->IsSameAs( wxT( "SYMBOL_DESCRIPTION" ) ) )
    {
        *token = GetShownDescription( INTERNAL, aDepth + 1 );
        return true;
    }
    else if( token->IsSameAs( wxT( "SYMBOL_KEYWORDS" ) ) )
    {
        *token = GetShownKeyWords( INTERNAL, aDepth + 1 );
        return true;
    }
    else if( token->IsSameAs( wxT( "SYMBOL_IS_POWER" ) ) )
    {
        *token = this->IsPower() ? wxString( wxS( "Power Symbol" ) ) : wxString( "" );
        return true;
    }
    else if( token->IsSameAs( wxT( "SYMBOL_IS_LOCAL_POWER" ) ) )
    {
        *token = this->IsLocalPower() ? wxString( wxS( "Local Power Symbol" ) ) : wxString( "" );
        return true;
    }
    else if( token->IsSameAs( wxT( "EXCLUDE_FROM_BOM" ) ) )
    {
        *token = this->GetExcludedFromBOM() ? wxS( "Excluded from BOM" ) : wxEmptyString;
        return true;
    }
    else if( token->IsSameAs( wxT( "EXCLUDE_FROM_BOARD" ) ) )
    {
        *token = this->GetExcludedFromBoard() ? wxS( "Excluded from board" ) : wxEmptyString;
        return true;
    }
    else if( token->IsSameAs( wxT( "EXCLUDE_FROM_SIM" ) ) )
    {
        *token = this->GetExcludedFromSim() ? wxS( "Excluded from simulation" ) : wxEmptyString;
        return true;
    }
    else if( token->IsSameAs( wxT( "DNP" ) ) )
    {
        *token = this->GetDNP() ? wxS( "DNP" ) : wxEmptyString;
        return true;
    }
 
    return false;
}
 
 
void LIB_SYMBOL::Plot( PLOTTER* aPlotter, bool aBackground, const SCH_PLOT_OPTS& aPlotOpts, int aUnit, int aBodyStyle,
                       const VECTOR2I& aOffset, bool aDimmed )
{
    wxASSERT( aPlotter != nullptr );
 
    SCH_RENDER_SETTINGS* renderSettings = getRenderSettings( aPlotter );
    COLOR4D              color = renderSettings->GetLayerColor( LAYER_DEVICE );
    COLOR4D              bg = renderSettings->GetBackgroundColor();
 
    if( bg == COLOR4D::UNSPECIFIED || !aPlotter->GetColorMode() )
        bg = COLOR4D::WHITE;
 
    if( color.m_text && Schematic() )
        color = COLOR4D( ResolveText( *color.m_text, &Schematic()->CurrentSheet() ) );
 
    if( aDimmed )
    {
        color.Desaturate();
        color = color.Mix( bg, 0.5f );
    }
 
    aPlotter->SetColor( color );
 
    for( SCH_ITEM& item : m_drawings )
    {
        // Do not plot private items
        if( item.IsPrivate() )
            continue;
 
        // LIB_FIELDs are not plotted here, because this plot function is used to plot schematic
        // items which have their own SCH_FIELDs
        if( item.Type() == SCH_FIELD_T )
            continue;
 
        if( aUnit && item.m_unit && ( item.m_unit != aUnit ) )
            continue;
 
        if( aBodyStyle && item.m_bodyStyle && ( item.m_bodyStyle != aBodyStyle ) )
            continue;
 
        item.Plot( aPlotter, aBackground, aPlotOpts, aUnit, aBodyStyle, aOffset, aDimmed );
    }
}
 
 
void LIB_SYMBOL::PlotFields( PLOTTER* aPlotter, bool aBackground, const SCH_PLOT_OPTS& aPlotOpts, int aUnit,
                             int aBodyStyle, const VECTOR2I& aOffset, bool aDimmed )
{
    wxASSERT( aPlotter != nullptr );
 
    SCH_RENDER_SETTINGS* renderSettings = getRenderSettings( aPlotter );
    COLOR4D              color = renderSettings->GetLayerColor( LAYER_FIELDS );
    COLOR4D              bg = renderSettings->GetBackgroundColor();
 
    if( bg == COLOR4D::UNSPECIFIED || !aPlotter->GetColorMode() )
        bg = COLOR4D::WHITE;
 
    if( aDimmed )
    {
        color.Desaturate();
        color = color.Mix( bg, 0.5f );
    }
 
    aPlotter->SetColor( color );
 
    for( SCH_ITEM& item : m_drawings[SCH_FIELD_T] )
    {
        SCH_FIELD& field = static_cast<SCH_FIELD&>( item );
 
        if( !renderSettings->m_ShowHiddenFields && !field.IsVisible() )
            continue;
 
        // The reference is a special case: we should change the basic text
        // to add '?' and the part id
        wxString tmp = field.GetText();
 
        field.SetText( field.GetFullText( aUnit ) );
        item.Plot( aPlotter, aBackground, aPlotOpts, aUnit, aBodyStyle, aOffset, aDimmed );
 
        field.SetText( tmp );
    }
}
 
 
void LIB_SYMBOL::FixupDrawItems()
{
    std::vector<SCH_SHAPE*> potential_top_items;
    std::vector<SCH_ITEM*>  bottom_items;
 
    for( SCH_ITEM& item : m_drawings )
    {
        if( item.Type() == SCH_SHAPE_T )
        {
            SCH_SHAPE& shape = static_cast<SCH_SHAPE&>( item );
 
            if( shape.GetFillMode() == FILL_T::FILLED_WITH_COLOR )
                potential_top_items.push_back( &shape );
            else
                bottom_items.push_back( &item );
        }
        else
        {
            bottom_items.push_back( &item );
        }
    }
 
    std::sort( potential_top_items.begin(), potential_top_items.end(),
               []( SCH_ITEM* a, SCH_ITEM* b )
               {
                   return a->GetBoundingBox().GetArea() > b->GetBoundingBox().GetArea();
               } );
 
    for( SCH_SHAPE* item : potential_top_items )
    {
        for( SCH_ITEM* bottom_item : bottom_items )
        {
            if( item->GetBoundingBox().Contains( bottom_item->GetBoundingBox() ) )
            {
                item->SetFillMode( FILL_T::FILLED_WITH_BG_BODYCOLOR );
                break;
            }
        }
    }
}
 
 
void LIB_SYMBOL::RemoveDrawItem( SCH_ITEM* aItem )
{
    wxASSERT( aItem != nullptr );
 
    // none of the MANDATORY_FIELDS may be removed in RAM, but they may be
    // omitted when saving to disk.
    if( aItem->Type() == SCH_FIELD_T )
    {
        if( static_cast<SCH_FIELD*>( aItem )->IsMandatory() )
            return;
    }
 
    LIB_ITEMS& items = m_drawings[aItem->Type()];
 
    for( LIB_ITEMS::iterator i = items.begin(); i != items.end(); i++ )
    {
        if( &*i == aItem )
        {
            items.erase( i );
            m_cachesDirty = true;
            break;
        }
    }
}
 
 
void LIB_SYMBOL::AddDrawItem( SCH_ITEM* aItem, bool aSort )
{
    if( aItem )
    {
        aItem->SetParent( this );
 
        m_drawings.push_back( aItem );
 
        if( aSort )
            m_drawings.sort();
 
        m_cachesDirty = true;
    }
}
 
 
std::vector<SCH_PIN*> LIB_SYMBOL::GetGraphicalPins( int aUnit, int aBodyStyle ) const
{
    if( IsDerived() )
    {
        std::shared_ptr<LIB_SYMBOL> root = GetSafeRootSymbol( this, __FUNCTION__ );
 
        if( root.get() != this )
            return const_cast<const LIB_SYMBOL*>( root.get() )->GetGraphicalPins( aUnit, aBodyStyle );
    }
 
    std::vector<SCH_PIN*> pins;
 
    /* Notes:
     * when aUnit == 0: no unit filtering
     * when aBodyStyle == 0: no body style filtering
     * when m_unit == 0, the item is common to all units
     * when m_bodyStyle == 0, the item is common to all body styles
     */
 
    for( const SCH_ITEM& item : m_drawings[SCH_PIN_T] )
    {
        // Unit filtering:
        if( aUnit && item.m_unit && ( item.m_unit != aUnit ) )
            continue;
 
        // Body style filtering:
        if( aBodyStyle && item.m_bodyStyle && ( item.m_bodyStyle != aBodyStyle ) )
            continue;
 
        pins.push_back( static_cast<SCH_PIN*>( const_cast<SCH_ITEM*>( &item ) ) );
    }
 
    return pins;
}
 
 
std::vector<LIB_SYMBOL::UNIT_PIN_INFO> LIB_SYMBOL::GetUnitPinInfo() const
{
    std::vector<UNIT_PIN_INFO> units;
 
    int unitCount = std::max( GetUnitCount(), 1 );
 
    auto compareByPosition =
            []( const SCH_PIN* a, const SCH_PIN* b )
            {
                VECTOR2I positionA = a->GetPosition();
                VECTOR2I positionB = b->GetPosition();
 
                if( positionA.x != positionB.x )
                    return positionA.x < positionB.x;
 
                return positionA.y < positionB.y;
            };
 
    for( int unitIdx = 1; unitIdx <= unitCount; ++unitIdx )
    {
        UNIT_PIN_INFO unitInfo;
        unitInfo.m_unitName = GetUnitDisplayName( unitIdx, false );
 
        std::vector<SCH_PIN*> pinList = GetGraphicalPins( unitIdx, 0 );
 
        std::sort( pinList.begin(), pinList.end(), compareByPosition );
 
        std::unordered_set<wxString> seenNumbers;
 
        for( const SCH_PIN* basePin : pinList )
        {
            bool                  stackedValid = false;
            std::vector<wxString> expandedNumbers = basePin->GetStackedPinNumbers( &stackedValid );
 
            if( stackedValid && !expandedNumbers.empty() )
            {
                for( const wxString& number : expandedNumbers )
                {
                    if( seenNumbers.insert( number ).second )
                        unitInfo.m_pinNumbers.push_back( number );
                }
 
                continue;
            }
 
            const wxString& number = basePin->GetNumber();
 
            if( !number.IsEmpty() && seenNumbers.insert( number ).second )
                unitInfo.m_pinNumbers.push_back( number );
        }
 
        units.push_back( std::move( unitInfo ) );
    }
 
    return units;
}
 
 
std::vector<LIB_SYMBOL::LOGICAL_PIN> LIB_SYMBOL::GetLogicalPins( int aUnit, int aBodyStyle ) const
{
    std::vector<LOGICAL_PIN> out;
 
    for( const SCH_PIN* pin : GetGraphicalPins( aUnit, aBodyStyle ) )
    {
        bool                  valid = false;
        std::vector<wxString> expanded = pin->GetStackedPinNumbers( &valid );
 
        if( valid && !expanded.empty() )
        {
            for( const wxString& num : expanded )
            {
                out.push_back( LOGICAL_PIN{ pin, num } );
                wxLogTrace( traceStackedPins, "GetLogicalPins: base='%s' -> '%s'", pin->GetShownNumber(), num );
            }
        }
        else
        {
            out.push_back( LOGICAL_PIN{ pin, pin->GetShownNumber() } );
            wxLogTrace( traceStackedPins, "GetLogicalPins: base='%s' (no expansion)", pin->GetShownNumber() );
        }
    }
 
    return out;
}
 
 
int LIB_SYMBOL::GetPinCount() const
{
    if( m_cachesDirty )
        rebuildCaches();
 
    return m_pinCountCache;
}
 
 
const SCH_PIN* LIB_SYMBOL::GetPin( const wxString& aNumber, int aUnit, int aBodyStyle ) const
{
    for( const SCH_PIN* pin : GetGraphicalPins( aUnit, aBodyStyle ) )
    {
        if( aNumber == pin->GetNumber() )
            return pin;
    }
 
    return nullptr;
}
 
 
std::vector<SCH_PIN*> LIB_SYMBOL::GetPinsByNumber( const wxString& aNumber, int aUnit, int aBodyStyle )
{
    std::vector<SCH_PIN*> pins;
 
    for( SCH_PIN* pin : GetGraphicalPins( aUnit, aBodyStyle ) )
    {
        if( aNumber == pin->GetNumber() )
            pins.push_back( pin );
    }
 
    return pins;
}
 
 
bool LIB_SYMBOL::HasPinNumber( const wxString& aNumber ) const
{
    if( GetPin( aNumber ) )
        return true;
 
    for( const SCH_PIN* pin : GetGraphicalPins( 0, 0 ) )
    {
        for( const wxString& logicalNumber : pin->GetStackedPinNumbers() )
        {
            if( aNumber == logicalNumber )
                return true;
        }
    }
 
    return false;
}
 
 
bool LIB_SYMBOL::PinsConflictWith( const LIB_SYMBOL& aOtherPart, bool aTestNums, bool aTestNames, bool aTestType,
                                   bool aTestOrientation, bool aTestLength ) const
{
    for( const SCH_PIN* pin : GetGraphicalPins() )
    {
        wxASSERT( pin );
        bool foundMatch = false;
 
        for( const SCH_PIN* otherPin : aOtherPart.GetGraphicalPins() )
        {
            wxASSERT( otherPin );
 
            // Same unit?
            if( pin->GetUnit() != otherPin->GetUnit() )
                continue;
 
            // Same body stype?
            if( pin->GetBodyStyle() != otherPin->GetBodyStyle() )
                continue;
 
            // Same position?
            if( pin->GetPosition() != otherPin->GetPosition() )
                continue;
 
            // Same number?
            if( aTestNums && ( pin->GetNumber() != otherPin->GetNumber() ) )
                continue;
 
            // Same name?
            if( aTestNames && ( pin->GetName() != otherPin->GetName() ) )
                continue;
 
            // Same electrical type?
            if( aTestType && ( pin->GetType() != otherPin->GetType() ) )
                continue;
 
            // Same orientation?
            if( aTestOrientation && ( pin->GetOrientation() != otherPin->GetOrientation() ) )
                continue;
 
            // Same length?
            if( aTestLength && ( pin->GetLength() != otherPin->GetLength() ) )
                continue;
 
            foundMatch = true;
            break; // Match found so search is complete.
        }
 
        if( !foundMatch )
        {
            // This means there was not an identical (according to the arguments)
            // pin at the same position in the other symbol.
            return true;
        }
    }
 
    // The loop never gave up, so no conflicts were found.
    return false;
}
 
const BOX2I LIB_SYMBOL::GetUnitBoundingBox( int aUnit, int aBodyStyle, bool aIgnoreHiddenFields,
                                            bool aIgnoreLabelsOnInvisiblePins ) const
{
    BOX2I bBox; // Start with a fresh BOX2I so the Merge algorithm works
 
    if( IsDerived() )
    {
        std::shared_ptr<LIB_SYMBOL> root = GetSafeRootSymbol( this, __FUNCTION__ );
 
        if( root.get() != this )
            bBox = root->GetUnitBoundingBox( aUnit, aBodyStyle, aIgnoreHiddenFields, aIgnoreLabelsOnInvisiblePins );
    }
 
    for( const SCH_ITEM& item : m_drawings )
    {
        if( item.m_unit > 0 && m_unitCount > 1 && aUnit > 0 && aUnit != item.m_unit )
            continue;
 
        if( item.m_bodyStyle > 0 && aBodyStyle > 0 && aBodyStyle != item.m_bodyStyle )
            continue;
 
        if( aIgnoreHiddenFields && item.Type() == SCH_FIELD_T )
        {
            if( !static_cast<const SCH_FIELD&>( item ).IsVisible() )
                continue;
        }
 
        if( item.Type() == SCH_PIN_T && !aIgnoreLabelsOnInvisiblePins )
        {
            const SCH_PIN& pin = static_cast<const SCH_PIN&>( item );
            bBox.Merge( pin.GetBoundingBox( true, true, false ) );
        }
        else
        {
            bBox.Merge( item.GetBoundingBox() );
        }
    }
 
    return bBox;
}
 
 
const BOX2I LIB_SYMBOL::GetBodyBoundingBox( int aUnit, int aBodyStyle, bool aIncludePins,
                                            bool aIncludePrivateItems ) const
{
    BOX2I bbox;
 
    for( const SCH_ITEM& item : m_drawings )
    {
        if( item.m_unit > 0 && aUnit > 0 && aUnit != item.m_unit )
            continue;
 
        if( item.m_bodyStyle > 0 && aBodyStyle > 0 && aBodyStyle != item.m_bodyStyle )
            continue;
 
        if( item.IsPrivate() && !aIncludePrivateItems )
            continue;
 
        if( item.Type() == SCH_FIELD_T )
            continue;
 
        if( item.Type() == SCH_PIN_T )
        {
            const SCH_PIN& pin = static_cast<const SCH_PIN&>( item );
 
            if( pin.IsVisible() )
            {
                // Note: the roots of the pins are always included for symbols that don't have
                // a well-defined body.
 
                if( aIncludePins )
                    bbox.Merge( pin.GetBoundingBox( false, false, false ) );
                else
                    bbox.Merge( pin.GetPinRoot() );
            }
        }
        else
        {
            bbox.Merge( item.GetBoundingBox() );
        }
    }
 
    return bbox;
}
 
 
void LIB_SYMBOL::RefreshLibraryTreeCaches()
{
    rebuildCaches();
}
 
 
void LIB_SYMBOL::deleteAllUserFields()
{
    m_drawings[SCH_FIELD_T].clear();
    m_cachesDirty = true;
}
 
 
void LIB_SYMBOL::AddField( SCH_FIELD* aField )
{
    AddDrawItem( aField );
}
 
 
void LIB_SYMBOL::SetFields( const std::vector<SCH_FIELD>& aFieldsList )
{
    deleteAllUserFields();
 
    for( const SCH_FIELD& src : aFieldsList )
    {
        // drawings is a ptr_vector, new and copy an object on the heap.
        SCH_FIELD* field = new SCH_FIELD( src );
 
        field->SetParent( this );
        m_drawings.push_back( field );
    }
 
    m_drawings.sort();
    m_cachesDirty = true;
}
 
 
void LIB_SYMBOL::GetFields( std::vector<SCH_FIELD*>& aList, bool aVisibleOnly ) const
{
    for( const SCH_ITEM& item : m_drawings[SCH_FIELD_T] )
    {
        const SCH_FIELD* field = static_cast<const SCH_FIELD*>( &item );
 
        if( aVisibleOnly )
        {
            if( !field->IsVisible() || field->GetText().IsEmpty() )
                continue;
        }
 
        aList.push_back( const_cast<SCH_FIELD*>( field ) );
    }
 
    std::sort( aList.begin(), aList.end(),
               []( SCH_FIELD* lhs, SCH_FIELD* rhs )
               {
                   return lhs->GetOrdinal() < rhs->GetOrdinal();
               } );
}
 
 
void LIB_SYMBOL::CopyFields( std::vector<SCH_FIELD>& aList )
{
    std::vector<SCH_FIELD*> orderedFields;
 
    GetFields( orderedFields );
 
    for( SCH_FIELD* field : orderedFields )
        aList.emplace_back( *field );
}
 
 
void LIB_SYMBOL::SyncFieldsFromParent( const LIB_FIELD_SYNC_OPTIONS& aOptions )
{
    std::shared_ptr<LIB_SYMBOL> parent = m_parent.lock();
 
    if( !parent )
        return;
 
    std::unique_ptr<LIB_SYMBOL> flattenedParent = parent->Flatten();
 
    auto selected =
            [&]( const wxString& aFieldName )
            {
                return aOptions.m_updateAllFields
                       || aOptions.m_updateFields.count( aFieldName ) > 0;
            };
 
    std::vector<SCH_FIELD> fieldsCopy;
    std::vector<SCH_FIELD> result;
    CopyFields( fieldsCopy );
 
    for( SCH_FIELD& field : fieldsCopy )
    {
        bool       copy = true;
        SCH_FIELD* parentField = nullptr;
 
        if( selected( field.GetName() ) )
        {
            if( field.IsMandatory() )
                parentField = flattenedParent->GetField( field.GetId() );
            else
                parentField = flattenedParent->GetField( field.GetName() );
 
            if( parentField )
            {
                bool resetText = parentField->GetText().IsEmpty() ? aOptions.m_resetEmptyText
                                                                  : aOptions.m_resetText;
 
                if( resetText )
                    field.SetText( parentField->GetText() );
 
                if( aOptions.m_resetVisibility )
                {
                    field.SetVisible( parentField->IsVisible() );
                    field.SetNameShown( parentField->IsNameShown() );
                }
 
                if( aOptions.m_resetEffects )
                {
                    // SetAttributes() also overwrites the visible bit and position, so save
                    // and restore them here.
                    bool     visible = field.IsVisible();
                    VECTOR2I pos = field.GetPosition();
 
                    field.SetAttributes( *parentField );
 
                    field.SetVisible( visible );
                    field.SetPosition( pos );
                }
 
                if( aOptions.m_resetPositions )
                    field.SetTextPos( parentField->GetTextPos() );
            }
            else if( aOptions.m_removeExtraFields )
            {
                copy = false;
            }
        }
 
        if( copy )
            result.emplace_back( std::move( field ) );
    }
 
    int                     nextOrdinal = GetNextFieldOrdinal();
    std::vector<SCH_FIELD*> parentFields;
 
    flattenedParent->GetFields( parentFields );
 
    for( SCH_FIELD* parentField : parentFields )
    {
        if( !selected( parentField->GetName() ) )
            continue;
 
        if( !GetField( parentField->GetName() ) )
        {
            result.emplace_back( this, FIELD_T::USER );
            SCH_FIELD* newField = &result.back();
 
            newField->SetName( parentField->GetUntranslatedName() );
            newField->SetText( parentField->GetText() );
            newField->SetAttributes( *parentField );   // Includes visible bit and position
            newField->SetOrdinal( nextOrdinal++, FIELD_T::USER );
        }
    }
 
    SetFields( result );
}
 
 
int LIB_SYMBOL::GetNextFieldOrdinal() const
{
    int ordinal = 42; // Arbitrarily larger than any mandatory FIELD_T id
 
    for( const SCH_ITEM& item : m_drawings[SCH_FIELD_T] )
        ordinal = std::max( ordinal, static_cast<const SCH_FIELD*>( &item )->GetOrdinal() + 1 );
 
    return ordinal;
}
 
 
const SCH_FIELD* LIB_SYMBOL::GetField( FIELD_T aFieldType ) const
{
    for( const SCH_ITEM& item : m_drawings[SCH_FIELD_T] )
    {
        const SCH_FIELD* field = static_cast<const SCH_FIELD*>( &item );
 
        if( field->GetId() == aFieldType )
            return field;
    }
 
    return nullptr;
}
 
 
SCH_FIELD* LIB_SYMBOL::GetField( FIELD_T aFieldType )
{
    for( SCH_ITEM& item : m_drawings[SCH_FIELD_T] )
    {
        SCH_FIELD* field = static_cast<SCH_FIELD*>( &item );
 
        if( field->GetId() == aFieldType )
            return field;
    }
 
    return nullptr;
}
 
 
const SCH_FIELD* LIB_SYMBOL::GetField( const wxString& aFieldName ) const
{
    for( const SCH_ITEM& item : m_drawings[SCH_FIELD_T] )
    {
        const SCH_FIELD& field = static_cast<const SCH_FIELD&>( item );
 
        if( field.GetName() == aFieldName )
            return &field;
    }
 
    return nullptr;
}
 
 
SCH_FIELD* LIB_SYMBOL::GetField( const wxString& aFieldName )
{
    for( SCH_ITEM& item : m_drawings[SCH_FIELD_T] )
    {
        SCH_FIELD& field = static_cast<SCH_FIELD&>( item );
 
        if( field.GetName() == aFieldName )
            return &field;
    }
 
    return nullptr;
}
 
 
SCH_FIELD* LIB_SYMBOL::FindFieldCaseInsensitive( const wxString& aFieldName )
{
    for( SCH_ITEM& item : m_drawings[SCH_FIELD_T] )
    {
        SCH_FIELD& field = static_cast<SCH_FIELD&>( item );
 
        if( field.GetUntranslatedName().IsSameAs( aFieldName, false ) )
            return &field;
    }
 
    return nullptr;
}
 
 
const SCH_FIELD* LIB_SYMBOL::FindFieldCaseInsensitive( const wxString& aFieldName ) const
{
    for( const SCH_ITEM& item : m_drawings[SCH_FIELD_T] )
    {
        const SCH_FIELD& field = static_cast<const SCH_FIELD&>( item );
 
        if( field.GetUntranslatedName().IsSameAs( aFieldName, false ) )
            return &field;
    }
 
    return nullptr;
}
 
 
const SCH_FIELD& LIB_SYMBOL::GetValueField() const
{
    const SCH_FIELD* field = GetField( FIELD_T::VALUE );
    wxASSERT( field != nullptr );
    return *field;
}
 
 
const SCH_FIELD& LIB_SYMBOL::GetReferenceField() const
{
    const SCH_FIELD* field = GetField( FIELD_T::REFERENCE );
    wxASSERT( field != nullptr );
    return *field;
}
 
 
const SCH_FIELD& LIB_SYMBOL::GetFootprintField() const
{
    const SCH_FIELD* field = GetField( FIELD_T::FOOTPRINT );
    wxASSERT( field != nullptr );
    return *field;
}
 
 
const SCH_FIELD& LIB_SYMBOL::GetDatasheetField() const
{
    const SCH_FIELD* field = GetField( FIELD_T::DATASHEET );
    wxASSERT( field != nullptr );
    return *field;
}
 
 
const SCH_FIELD& LIB_SYMBOL::GetDescriptionField() const
{
    const SCH_FIELD* field = GetField( FIELD_T::DESCRIPTION );
    wxASSERT( field != nullptr );
    return *field;
}
 
 
wxString LIB_SYMBOL::GetPrefix()
{
    wxString refDesignator = GetField( FIELD_T::REFERENCE )->GetText();
 
    refDesignator.Replace( wxS( "~" ), wxS( " " ) );
 
    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 );
 
    return prefix;
}
 
 
void LIB_SYMBOL::RunOnChildren( const std::function<void( SCH_ITEM* )>& aFunction, RECURSE_MODE aMode )
{
    for( SCH_ITEM& item : m_drawings )
        aFunction( &item );
 
    // We don't know what this did, so better to be safe than sorry
    m_cachesDirty = true;
}
 
 
void LIB_SYMBOL::Move( const VECTOR2I& aOffset )
{
    for( SCH_ITEM& item : m_drawings )
        item.Move( aOffset );
}
 
 
// Before V10 we didn't store the number of body styles in a symbol -- we just looked through all
// its drawings each time we wanted to know.  This is now only used to set the count when a legacy
// symbol is first read.  (Legacy symbols also didn't support arbitrary body styles, so the count
// is always 1 or 2, and when 2 it is always a De Morgan pair.)
bool LIB_SYMBOL::HasLegacyAlternateBodyStyle() const
{
    for( const SCH_ITEM& item : m_drawings )
    {
        if( item.m_bodyStyle > BODY_STYLE::BASE )
            return true;
    }
 
    if( IsDerived() )
    {
        std::shared_ptr<LIB_SYMBOL> root = GetSafeRootSymbol( this, __FUNCTION__ );
 
        if( root.get() != this )
            return root->HasLegacyAlternateBodyStyle();
    }
 
    return false;
}
 
 
int LIB_SYMBOL::GetMaxPinNumber() const
{
    if( IsDerived() )
    {
        std::shared_ptr<LIB_SYMBOL> root = GetSafeRootSymbol( this, __FUNCTION__ );
 
        if( root.get() != this )
            return root->GetMaxPinNumber();
    }
 
    int maxPinNumber = 0;
 
    for( const SCH_ITEM& item : m_drawings[SCH_PIN_T] )
    {
        const SCH_PIN* pin = static_cast<const SCH_PIN*>( &item );
        long           currentPinNumber = 0;
 
        if( pin->GetNumber().ToLong( &currentPinNumber ) )
            maxPinNumber = std::max( maxPinNumber, (int) currentPinNumber );
    }
 
    return maxPinNumber;
}
 
 
void LIB_SYMBOL::ClearTempFlags()
{
    SCH_ITEM::ClearTempFlags();
 
    for( SCH_ITEM& item : m_drawings )
        item.ClearTempFlags();
}
 
 
void LIB_SYMBOL::ClearEditFlags()
{
    SCH_ITEM::ClearEditFlags();
 
    for( SCH_ITEM& item : m_drawings )
        item.ClearEditFlags();
}
 
 
SCH_ITEM* LIB_SYMBOL::LocateDrawItem( int aUnit, int aBodyStyle, KICAD_T aType, const VECTOR2I& aPoint )
{
    for( SCH_ITEM& item : m_drawings )
    {
        if( ( aUnit && item.m_unit && aUnit != item.m_unit )
            || ( aBodyStyle && item.m_bodyStyle && aBodyStyle != item.m_bodyStyle )
            || ( item.Type() != aType && aType != TYPE_NOT_INIT ) )
        {
            continue;
        }
 
        if( item.HitTest( aPoint ) )
            return &item;
    }
 
    return nullptr;
}
 
 
SCH_ITEM* LIB_SYMBOL::LocateDrawItem( int aUnit, int aBodyStyle, KICAD_T aType, const VECTOR2I& aPoint,
                                      const TRANSFORM& aTransform )
{
    /* we use LocateDrawItem( int aUnit, int convert, KICAD_T type, const
     * VECTOR2I& pt ) to search items.
     * because this function uses DefaultTransform as orient/mirror matrix
     * we temporary copy aTransform in DefaultTransform
     */
    TRANSFORM transform = DefaultTransform;
    DefaultTransform = aTransform;
 
    SCH_ITEM* item = LocateDrawItem( aUnit, aBodyStyle, aType, aPoint );
 
    // Restore matrix
    DefaultTransform = transform;
 
    return item;
}
 
 
INSPECT_RESULT LIB_SYMBOL::Visit( INSPECTOR aInspector, void* aTestData, const std::vector<KICAD_T>& aScanTypes )
{
    // The part itself is never inspected, only its children
    for( SCH_ITEM& item : m_drawings )
    {
        if( item.IsType( aScanTypes ) )
        {
            if( aInspector( &item, aTestData ) == INSPECT_RESULT::QUIT )
                return INSPECT_RESULT::QUIT;
        }
    }
 
    return INSPECT_RESULT::CONTINUE;
}
 
 
void LIB_SYMBOL::SetUnitCount( int aCount, bool aDuplicateDrawItems )
{
    // A LIB_SYMBOL must always have at least one unit. Passing a value less than 1 would
    // erase the mandatory fields (which all have m_unit == 0), leaving the symbol in a
    // broken state that crashes later when callers dereference GetReferenceField() etc.
    wxCHECK_RET( aCount >= 1, wxString::Format( wxT( "Invalid unit count %d, ignoring." ), aCount ) );
 
    if( m_unitCount == aCount )
        return;
 
    if( aCount < m_unitCount )
    {
        // Iterate each drawing-type bucket and erase items that belong to units > aCount.
        for( int type = LIB_ITEMS_CONTAINER::FIRST_TYPE; type <= LIB_ITEMS_CONTAINER::LAST_TYPE; ++type )
        {
            auto it = m_drawings.begin( type );
 
            while( it != m_drawings.end( type ) )
            {
                if( it->m_unit > aCount )
                    it = m_drawings.erase( it ); // returns next iterator
                else
                    ++it;
            }
        }
    }
    else if( aDuplicateDrawItems )
    {
        int prevCount = m_unitCount;
 
        // Temporary storage for new items, as adding new items directly to
        // m_drawings may cause the buffer reallocation which invalidates the
        // iterators
        std::vector<SCH_ITEM*> tmp;
 
        for( SCH_ITEM& item : m_drawings )
        {
            if( item.m_unit != 1 )
                continue;
 
            for( int j = prevCount + 1; j <= aCount; j++ )
            {
                SCH_ITEM* newItem = item.Duplicate( IGNORE_PARENT_GROUP );
                newItem->m_unit = j;
                tmp.push_back( newItem );
            }
        }
 
        for( SCH_ITEM* item : tmp )
            m_drawings.push_back( item );
    }
 
    m_drawings.sort();
    m_unitCount = aCount;
    m_cachesDirty = true;
}
 
 
int LIB_SYMBOL::GetUnitCount() const
{
    if( IsDerived() )
    {
        std::shared_ptr<LIB_SYMBOL> root = GetSafeRootSymbol( this, __FUNCTION__ );
 
        if( root.get() != this )
            return root->GetUnitCount();
    }
 
    return m_unitCount;
}
 
 
int LIB_SYMBOL::GetBodyStyleCount() const
{
    if( HasDeMorganBodyStyles() )
        return 2;
 
    return std::max( 1, (int) GetBodyStyleNames().size() );
}
 
 
bool LIB_SYMBOL::HasDeMorganBodyStyles() const
{
    if( IsDerived() )
    {
        std::shared_ptr<LIB_SYMBOL> root = GetSafeRootSymbol( this, __FUNCTION__ );
 
        if( root.get() != this )
            return root->m_demorgan;
    }
 
    return m_demorgan;
}
 
 
const std::vector<wxString>& LIB_SYMBOL::GetBodyStyleNames() const
{
    if( IsDerived() )
    {
        std::shared_ptr<LIB_SYMBOL> root = GetSafeRootSymbol( this, __FUNCTION__ );
 
        if( root.get() != this )
            return root->m_bodyStyleNames;
    }
 
    return m_bodyStyleNames;
}
 
 
void LIB_SYMBOL::SetBodyStyleCount( int aCount, bool aDuplicateDrawItems, bool aDuplicatePins )
{
    wxCHECK_RET( aCount >= 1,
                 wxString::Format( wxT( "Invalid body style count %d, ignoring." ), aCount ) );
 
    int prevCount = GetBodyStyleCount();
 
    // Populate the new body styles from the standard one
    if( prevCount < aCount && ( aDuplicateDrawItems || aDuplicatePins ) )
    {
        std::vector<SCH_ITEM*> tmp; // Adding to m_drawings while iterating it invalidates the iterator
 
        for( SCH_ITEM& item : m_drawings )
        {
            if( item.Type() == SCH_PIN_T )
            {
                if( !aDuplicatePins )
                    continue;
            }
            else
            {
                if( !aDuplicateDrawItems )
                    continue;
            }
 
            if( item.m_bodyStyle == BODY_STYLE::BASE )
            {
                for( int j = prevCount + 1; j <= aCount; j++ )
                {
                    SCH_ITEM* newItem = item.Duplicate( IGNORE_PARENT_GROUP );
                    newItem->m_bodyStyle = j;
                    tmp.push_back( newItem );
                }
            }
        }
 
        for( SCH_ITEM* item : tmp )
            m_drawings.push_back( item );
 
        m_drawings.sort();
    }
 
    // A caller that already cleared the De Morgan flag or the body style names reports a
    // previous count of 1, so the deletion cannot be conditional on the count dropping
    PruneBodyStyleDrawItems( aCount );
 
    m_cachesDirty = true;
}
 
 
void LIB_SYMBOL::PruneBodyStyleDrawItems( int aBodyStyleCount )
{
    LIB_ITEMS_CONTAINER::ITERATOR i = m_drawings.begin();
 
    while( i != m_drawings.end() )
    {
        if( i->m_bodyStyle > aBodyStyleCount )
            i = m_drawings.erase( i );
        else
            ++i;
    }
}
 
 
std::vector<SCH_ITEM*> LIB_SYMBOL::GetUnitDrawItems( int aUnit, int aBodyStyle )
{
    std::vector<SCH_ITEM*> unitItems;
 
    for( SCH_ITEM& item : m_drawings )
    {
        if( item.Type() == SCH_FIELD_T )
            continue;
 
        if( aUnit != ALL_UNITS
                && item.GetUnit() != ALL_UNITS
                && aUnit != item.GetUnit() )
        {
            continue;
        }
 
        if( aBodyStyle != ALL_BODY_STYLES
                && item.GetBodyStyle() != ALL_BODY_STYLES
                && aBodyStyle != item.GetBodyStyle() )
        {
            continue;
        }
 
        unitItems.push_back( &item );
    }
 
    return unitItems;
}
 
 
std::vector<LIB_SYMBOL_UNIT> LIB_SYMBOL::GetUnitDrawItems()
{
    std::vector<LIB_SYMBOL_UNIT> units;
 
    // Enforce writing out of all defined unit/body-style combinations
    for( int unit = 1; unit <= GetUnitCount(); unit++ )
    {
        for( int bodyStyle = 1; bodyStyle <= GetBodyStyleCount(); bodyStyle++ )
        {
            LIB_SYMBOL_UNIT record;
            record.m_unit = unit;
            record.m_bodyStyle = bodyStyle;
            units.push_back( std::move( record ) );
        }
    }
 
    for( SCH_ITEM& item : m_drawings )
    {
        if( item.Type() == SCH_FIELD_T )
            continue;
 
        int unit = item.GetUnit();
        int bodyStyle = item.GetBodyStyle();
 
        auto it = std::find_if( units.begin(), units.end(),
                                [unit, bodyStyle]( const LIB_SYMBOL_UNIT& a )
                                {
                                    return a.m_unit == unit && a.m_bodyStyle == bodyStyle;
                                } );
 
        if( it == units.end() )
        {
            LIB_SYMBOL_UNIT record;
            record.m_unit = unit;
            record.m_bodyStyle = bodyStyle;
            it = units.insert( units.end(), std::move( record ) );
        }
 
        it->m_items.push_back( &item );
    }
 
    std::sort( units.begin(), units.end(),
               []( const LIB_SYMBOL_UNIT& a, const LIB_SYMBOL_UNIT& b )
               {
                   if( a.m_unit == b.m_unit )
                       return a.m_bodyStyle < b.m_bodyStyle;
 
                   return a.m_unit < b.m_unit;
               } );
 
    return units;
}
 
 
#define REPORT( msg )                                                                                                  \
    {                                                                                                                  \
        if( aReporter )                                                                                                \
            aReporter->Report( msg );                                                                                  \
    }
 
#define ITEM_DESC( item ) ( item )->GetItemDescription( &unitsProvider, false )
 
 
LIB_SYMBOL_ATTRIBUTES LIB_SYMBOL::ComparisonAttributes() const
{
    return { m_options, m_unitCount, m_fpFilters, m_pinMaps, m_associatedFootprints, m_keyWords,
             m_pinNameOffset, m_showPinNames, m_showPinNumbers, m_excludedFromSim, m_excludedFromBOM,
             m_excludedFromBoard, m_excludedFromPosFiles, m_DNP, m_unitsLocked, m_unitDisplayNames,
             m_bodyStyleNames, m_duplicatePinNumbersAreJumpers };
}
 
 
bool LIB_SYMBOL_ATTRIBUTES::Matches( const LIB_SYMBOL_ATTRIBUTES& aOther, int aCompareFlags ) const
{
    using FLAGS = SCH_ITEM::COMPARE_FLAGS;
 
    if( options != aOther.options || unitCount != aOther.unitCount || footprintFilters != aOther.footprintFilters
        || pinMaps != aOther.pinMaps || associatedFootprints != aOther.associatedFootprints
        || keywords != aOther.keywords || pinNameOffset != aOther.pinNameOffset
        || unitsLocked != aOther.unitsLocked || unitDisplayNames != aOther.unitDisplayNames
        || bodyStyleNames != aOther.bodyStyleNames )
    {
        return false;
    }
 
    if( ( aCompareFlags & FLAGS::PIN_VISIBILITIES )
        && ( showPinNames != aOther.showPinNames || showPinNumbers != aOther.showPinNumbers ) )
    {
        return false;
    }
 
    return ( !( aCompareFlags & FLAGS::EXCLUDE_FROM_SIM ) || excludedFromSim == aOther.excludedFromSim )
           && ( !( aCompareFlags & FLAGS::EXCLUDE_FROM_BOM ) || excludedFromBOM == aOther.excludedFromBOM )
           && ( !( aCompareFlags & FLAGS::EXCLUDE_FROM_BOARD ) || excludedFromBoard == aOther.excludedFromBoard )
           && ( !( aCompareFlags & FLAGS::EXCLUDE_FROM_POS_FILES )
                || excludedFromPosFiles == aOther.excludedFromPosFiles )
           && ( !( aCompareFlags & FLAGS::DNP ) || dnp == aOther.dnp );
}
 
 
int LIB_SYMBOL::Compare( const LIB_SYMBOL& aRhs, int aCompareFlags, REPORTER* aReporter ) const
{
    UNITS_PROVIDER unitsProvider( schIUScale, EDA_UNITS::MM );
 
    if( m_me == aRhs.m_me )
        return 0;
 
    int retv = 0;
 
    if( aCompareFlags & COMPARE_FLAGS::IDENTITY )
    {
        if( int tmp = m_name.Cmp( aRhs.m_name ) )
        {
            retv = tmp;
            REPORT( _( "Name differs." ) );
 
            if( !aReporter )
                return retv;
        }
 
        if( int tmp = m_libId.compare( aRhs.m_libId ) )
        {
            retv = tmp;
            REPORT( _( "Library ID differs." ) );
 
            if( !aReporter )
                return retv;
        }
 
        if( m_parent.lock() < aRhs.m_parent.lock() )
            retv = -1;
        else if( m_parent.lock() > aRhs.m_parent.lock() )
            retv = 1;
 
        if( retv )
        {
            REPORT( _( "Symbol parent differs." ) );
 
            if( !aReporter )
                return retv;
        }
    }
 
    if( m_options != aRhs.m_options )
    {
        retv = ( m_options == ENTRY_NORMAL ) ? -1 : 1;
        REPORT( _( "Power flag differs." ) );
 
        if( !aReporter )
            return retv;
    }
 
    if( int tmp = m_unitCount - aRhs.m_unitCount )
    {
        retv = tmp;
        REPORT( _( "Unit count differs." ) );
 
        if( !aReporter )
            return retv;
    }
 
    // Make sure shapes are sorted. No need with fields or pins as those are matched by id/name and number.
 
    std::set<const SCH_ITEM*, SCH_ITEM::cmp_items> aShapes;
    std::set<const SCH_FIELD*>                     aFields;
    std::set<const SCH_PIN*>                       aPins;
 
    for( auto it = m_drawings.begin(); it != m_drawings.end(); ++it )
    {
        if( it->Type() == SCH_SHAPE_T )
            aShapes.insert( &( *it ) );
        else if( it->Type() == SCH_FIELD_T )
            aFields.insert( static_cast<const SCH_FIELD*>( &( *it ) ) );
        else if( it->Type() == SCH_PIN_T )
            aPins.insert( static_cast<const SCH_PIN*>( &( *it ) ) );
    }
 
    std::set<const SCH_ITEM*, SCH_ITEM::cmp_items> bShapes;
    std::set<const SCH_FIELD*>                     bFields;
    std::set<const SCH_PIN*>                       bPins;
 
    for( auto it = aRhs.m_drawings.begin(); it != aRhs.m_drawings.end(); ++it )
    {
        if( it->Type() == SCH_SHAPE_T )
            bShapes.insert( &( *it ) );
        else if( it->Type() == SCH_FIELD_T )
            bFields.insert( static_cast<const SCH_FIELD*>( &( *it ) ) );
        else if( it->Type() == SCH_PIN_T )
            bPins.insert( static_cast<const SCH_PIN*>( &( *it ) ) );
    }
 
    if( int tmp = static_cast<int>( aShapes.size() - bShapes.size() ) )
    {
        retv = tmp;
        REPORT( _( "Graphic item count differs." ) );
 
        if( !aReporter )
            return retv;
    }
    else
    {
        for( auto aIt = aShapes.begin(), bIt = bShapes.begin(); aIt != aShapes.end(); aIt++, bIt++ )
        {
            if( int tmp2 = ( *aIt )->compare( *( *bIt ), aCompareFlags ) )
            {
                retv = tmp2;
                REPORT( wxString::Format( _( "Graphic item differs: %s; %s." ),
                                          ITEM_DESC( *aIt ),
                                          ITEM_DESC( *bIt ) ) );
 
                if( !aReporter )
                    return retv;
            }
        }
    }
 
    for( const SCH_PIN* aPin : aPins )
    {
        const SCH_PIN* bPin = aRhs.GetPin( aPin->GetNumber(), aPin->GetUnit(), aPin->GetBodyStyle() );
 
        if( !bPin )
        {
            retv = 1;
            REPORT( wxString::Format( _( "Extra pin in schematic symbol: %s." ), ITEM_DESC( aPin ) ) );
 
            if( !aReporter )
                return retv;
        }
        else if( int tmp = static_cast<const SCH_ITEM*>( aPin )->compare( *bPin, aCompareFlags ) )
        {
            retv = tmp;
            REPORT( wxString::Format( _( "Pin %s differs: %s; %s" ),
                                      aPin->GetNumber(),
                                      ITEM_DESC( aPin ),
                                      ITEM_DESC( bPin ) ) );
 
            if( !aReporter )
                return retv;
        }
    }
 
    for( const SCH_PIN* bPin : bPins )
    {
        const SCH_PIN* aPin = GetPin( bPin->GetNumber(), bPin->GetUnit(), bPin->GetBodyStyle() );
 
        if( !aPin )
        {
            retv = 1;
            REPORT( wxString::Format( _( "Missing pin in schematic symbol: %s." ), ITEM_DESC( bPin ) ) );
 
            if( !aReporter )
                return retv;
        }
    }
 
    for( const SCH_FIELD* aField : aFields )
    {
        const SCH_FIELD* bField = nullptr;
 
        if( aField->IsMandatory() )
            bField = aRhs.GetField( aField->GetId() );
        else
            bField = aRhs.GetField( aField->GetName() );
 
        if( !bField )
        {
            if( aCompareFlags & COMPARE_FLAGS::EXTRA_FIELDS )
            {
                retv = 1;
                REPORT( wxString::Format( _( "Extra field in schematic symbol: %s." ), aField->GetName( false ) ) );
 
                if( !aReporter )
                    return retv;
            }
        }
        else
        {
            if( ( aCompareFlags & COMPARE_FLAGS::FIELD_TEXT ) && aField->GetId() != FIELD_T::REFERENCE )
            {
                if( int tmp = aField->GetText().compare( bField->GetText() ) )
                {
                    retv = tmp;
                    REPORT( wxString::Format( _( "Field '%s' differs: %s; %s." ),
                                              aField->GetName( false ),
                                              aField->GetText(),
                                              bField->GetText() ) );
 
                    if( !aReporter )
                        return retv;
                }
            }
 
            if( aCompareFlags & COMPARE_FLAGS::FIELD_SIZE_AND_STYLE )
            {
                if( aField->GetFont() != bField->GetFont() )
                {
                    retv = std::less<KIFONT::FONT*>{}( aField->GetFont(), bField->GetFont() ) ? -1 : 1;
                    REPORT( wxString::Format( _( "Field '%s' fonts differ." ), aField->GetName( false ) ) );
 
                    if( !aReporter )
                        return retv;
                }
 
                if( aField->GetTextSize() != bField->GetTextSize() )
                {
                    if( aField->GetTextSize().x != bField->GetTextSize().x )
                        retv = aField->GetTextSize().x - bField->GetTextSize().x;
                    else
                        retv = aField->GetTextSize().y - bField->GetTextSize().y;
 
                    REPORT( wxString::Format( _( "Field '%s' text sizes differ." ), aField->GetName( false ) ) );
 
                    if( !aReporter )
                        return retv;
                }
 
                if( int tmp = aField->GetAttributes().Compare( bField->GetAttributes() ) )
                {
                    retv = tmp;
                    REPORT( wxString::Format( _( "Field '%s' text styles differ." ), aField->GetName( false ) ) );
 
                    if( !aReporter )
                        return retv;
                }
            }
 
            if( aCompareFlags & COMPARE_FLAGS::FIELD_VISIBILITY )
            {
                if( aField->IsVisible() != bField->IsVisible() )
                {
                    retv = aField->IsVisible() ? 1 : -1;
                    REPORT( wxString::Format( _( "Field '%s' visibility flags differ." ), aField->GetName( false ) ) );
 
                    if( !aReporter )
                        return retv;
                }
 
                if( aField->IsNameShown() != bField->IsNameShown() )
                {
                    retv = aField->IsNameShown() ? 1 : -1;
                    REPORT( wxString::Format( _( "Field '%s' name shown flags differ." ), aField->GetName( false ) ) );
 
                    if( !aReporter )
                        return retv;
                }
            }
 
            if( aField->IsPrivate() != bField->IsPrivate() )
            {
                retv = aField->IsPrivate() ? 1 : -1;
                REPORT( wxString::Format( _( "Field '%s' privacy flags differ." ), aField->GetName( false ) ) );
 
                if( !aReporter )
                    return retv;
            }
 
            if( aCompareFlags & COMPARE_FLAGS::FIELD_POSITIONS )
            {
                if( aField->GetPosition() != bField->GetPosition() )
                {
                    if( aField->GetPosition().x != bField->GetPosition().x )
                        retv = aField->GetPosition().x - bField->GetPosition().x;
                    else if( aField->GetPosition().y != bField->GetPosition().y )
                        retv = aField->GetPosition().y - bField->GetPosition().y;
 
                    REPORT( wxString::Format( _( "Field '%s' positions differ." ), aField->GetName( false ) ) );
 
                    if( !aReporter )
                        return retv;
                }
            }
        }
    }
 
    if( aCompareFlags & COMPARE_FLAGS::MISSING_FIELDS )
    {
        for( const SCH_FIELD* bField : bFields )
        {
            const SCH_FIELD* aField = nullptr;
 
            if( bField->IsMandatory() )
                aField = GetField( bField->GetId() );
            else
                aField = GetField( bField->GetName() );
 
            if( !aField )
            {
                retv = 1;
                REPORT( wxString::Format( _( "Missing field in schematic symbol: %s." ), bField->GetName( false ) ) );
 
                if( !aReporter )
                    return retv;
            }
        }
    }
 
    if( int tmp = static_cast<int>( m_fpFilters.GetCount() - aRhs.m_fpFilters.GetCount() ) )
    {
        retv = tmp;
        REPORT( _( "Footprint filter count differs." ) );
 
        if( !aReporter )
            return retv;
    }
    else
    {
        for( size_t i = 0; i < m_fpFilters.GetCount(); i++ )
        {
            if( int tmp2 = m_fpFilters[i].Cmp( aRhs.m_fpFilters[i] ) )
            {
                retv = tmp2;
                REPORT( _( "Footprint filters differ." ) );
 
                if( !aReporter )
                    return retv;
            }
        }
    }
 
    if( int tmp = static_cast<int>( m_pinMaps.GetAll().size() - aRhs.m_pinMaps.GetAll().size() ) )
    {
        retv = tmp;
        REPORT( _( "Pin map count differs." ) );
 
        if( !aReporter )
            return retv;
    }
    else if( m_pinMaps != aRhs.m_pinMaps )
    {
        retv = 1;
        REPORT( _( "Pin maps differ." ) );
 
        if( !aReporter )
            return retv;
    }
 
    if( int tmp = static_cast<int>( m_associatedFootprints.size() - aRhs.m_associatedFootprints.size() ) )
    {
        retv = tmp;
        REPORT( _( "Associated footprint count differs." ) );
 
        if( !aReporter )
            return retv;
    }
    else if( m_associatedFootprints != aRhs.m_associatedFootprints )
    {
        retv = 1;
        REPORT( _( "Associated footprints differ." ) );
 
        if( !aReporter )
            return retv;
    }
 
    if( int tmp = m_keyWords.Cmp( aRhs.m_keyWords ) )
    {
        retv = tmp;
        REPORT( _( "Symbol keywords differ." ) );
 
        if( !aReporter )
            return retv;
    }
 
    if( int tmp = m_pinNameOffset - aRhs.m_pinNameOffset )
    {
        retv = tmp;
        REPORT( _( "Symbol pin name offsets differ." ) );
 
        if( !aReporter )
            return retv;
    }
 
    if( aCompareFlags & COMPARE_FLAGS::PIN_VISIBILITIES )
    {
        if( m_showPinNames != aRhs.m_showPinNames )
        {
            retv = ( m_showPinNames ) ? 1 : -1;
            REPORT( _( "Show pin names settings differ." ) );
 
            if( !aReporter )
                return retv;
        }
 
        if( m_showPinNumbers != aRhs.m_showPinNumbers )
        {
            retv = ( m_showPinNumbers ) ? 1 : -1;
            REPORT( _( "Show pin numbers settings differ." ) );
 
            if( !aReporter )
                return retv;
        }
    }
 
    if( aCompareFlags & COMPARE_FLAGS::EXCLUDE_FROM_SIM )
    {
        if( m_excludedFromSim != aRhs.m_excludedFromSim )
        {
            retv = ( m_excludedFromSim ) ? -1 : 1;
            REPORT( _( "Exclude from simulation settings differ." ) );
 
            if( !aReporter )
                return retv;
        }
    }
 
    if( aCompareFlags & COMPARE_FLAGS::EXCLUDE_FROM_BOM )
    {
        if( m_excludedFromBOM != aRhs.m_excludedFromBOM )
        {
            retv = ( m_excludedFromBOM ) ? -1 : 1;
            REPORT( _( "Exclude from bill of materials settings differ." ) );
 
            if( !aReporter )
                return retv;
        }
    }
 
    if( aCompareFlags & COMPARE_FLAGS::EXCLUDE_FROM_BOARD )
    {
        if( m_excludedFromBoard != aRhs.m_excludedFromBoard )
        {
            retv = ( m_excludedFromBoard ) ? -1 : 1;
            REPORT( _( "Exclude from board settings differ." ) );
 
            if( !aReporter )
                return retv;
        }
    }
 
    if( aCompareFlags & COMPARE_FLAGS::DNP )
    {
        if( m_DNP != aRhs.m_DNP )
        {
            retv = ( m_DNP ) ? -1 : 1;
            REPORT( _( "Do not populate settings differ." ) );
 
            if( !aReporter )
                return retv;
        }
    }
 
    if( aCompareFlags & COMPARE_FLAGS::EXCLUDE_FROM_POS_FILES )
    {
        if( m_excludedFromPosFiles != aRhs.m_excludedFromPosFiles )
        {
            retv = ( m_excludedFromPosFiles ) ? -1 : 1;
            REPORT( _( "Exclude from position files settings differ." ) );
 
            if( !aReporter )
                return retv;
        }
    }
 
    if( !aReporter )
    {
        if( m_unitsLocked != aRhs.m_unitsLocked )
            return ( m_unitsLocked ) ? 1 : -1;
 
        // Compare unit display names...
        if( m_unitDisplayNames < aRhs.m_unitDisplayNames )
            return -1;
        else if( m_unitDisplayNames > aRhs.m_unitDisplayNames )
            return 1;
 
        // ... and body style names.
        if( m_bodyStyleNames < aRhs.m_bodyStyleNames )
            return -1;
        else if( m_bodyStyleNames > aRhs.m_bodyStyleNames )
            return 1;
    }
 
    return retv;
}
 
 
int LIB_SYMBOL::compare( const SCH_ITEM& aOther, int aCompareFlags ) const
{
    if( Type() != aOther.Type() )
        return Type() - aOther.Type();
 
    const LIB_SYMBOL* tmp = static_cast<const LIB_SYMBOL*>( &aOther );
 
    return Compare( *tmp, aCompareFlags );
}
 
 
double LIB_SYMBOL::Similarity( const SCH_ITEM& aOther ) const
{
    wxCHECK( aOther.Type() == LIB_SYMBOL_T, 0.0 );
 
    const LIB_SYMBOL& other = static_cast<const LIB_SYMBOL&>( aOther );
    double            similarity = 0.0;
    int               totalItems = 0;
 
    if( m_Uuid == aOther.m_Uuid )
        return 1.0;
 
    for( const SCH_ITEM& item : m_drawings )
    {
        totalItems += 1;
        double max_similarity = 0.0;
 
        for( const SCH_ITEM& otherItem : other.m_drawings )
        {
            double temp_similarity = item.Similarity( otherItem );
            max_similarity = std::max( max_similarity, temp_similarity );
 
            if( max_similarity == 1.0 )
                break;
        }
 
        similarity += max_similarity;
    }
 
    for( const SCH_PIN* pin : GetGraphicalPins( 0, 0 ) )
    {
        totalItems += 1;
        double max_similarity = 0.0;
 
        for( const SCH_PIN* otherPin : other.GetGraphicalPins( 0, 0 ) )
        {
            double temp_similarity = pin->Similarity( *otherPin );
            max_similarity = std::max( max_similarity, temp_similarity );
 
            if( max_similarity == 1.0 )
                break;
        }
 
        similarity += max_similarity;
    }
 
    if( totalItems == 0 )
        similarity = 0.0;
    else
        similarity /= totalItems;
 
    if( m_excludedFromBoard != other.m_excludedFromBoard )
        similarity *= 0.9;
 
    if( m_excludedFromBOM != other.m_excludedFromBOM )
        similarity *= 0.9;
 
    if( m_excludedFromSim != other.m_excludedFromSim )
        similarity *= 0.9;
 
    if( m_excludedFromPosFiles != other.m_excludedFromPosFiles )
        similarity *= 0.9;
 
    if( m_flags != other.m_flags )
        similarity *= 0.9;
 
    if( m_unitCount != other.m_unitCount )
        similarity *= 0.5;
 
    if( GetBodyStyleCount() != other.GetBodyStyleCount() )
        similarity *= 0.5;
    else if( m_bodyStyleNames != other.m_bodyStyleNames )
        similarity *= 0.9;
 
    if( m_pinNameOffset != other.m_pinNameOffset )
        similarity *= 0.9;
 
    if( m_showPinNames != other.m_showPinNames )
        similarity *= 0.9;
 
    if( m_showPinNumbers != other.m_showPinNumbers )
        similarity *= 0.9;
 
    return similarity;
}
 
 
EMBEDDED_FILES* LIB_SYMBOL::GetEmbeddedFiles()
{
    return static_cast<EMBEDDED_FILES*>( this );
}
 
 
const EMBEDDED_FILES* LIB_SYMBOL::GetEmbeddedFiles() const
{
    return static_cast<const EMBEDDED_FILES*>( this );
}
 
 
void LIB_SYMBOL::AppendParentEmbeddedFiles( std::vector<EMBEDDED_FILES*>& aStack ) const
{
    std::set<const LIB_SYMBOL*> visited;
    visited.insert( this );
 
    std::shared_ptr<LIB_SYMBOL> parent = m_parent.lock();
 
    while( parent )
    {
        // Cycle detected - parent chain points back to an already visited symbol
        if( visited.count( parent.get() ) )
        {
            wxLogTrace( traceSymbolInheritance,
                        wxT( "AppendParentEmbeddedFiles: Circular inheritance detected in "
                             "symbol '%s' (lib: %s)" ),
                        m_name, m_libId.GetLibNickname().wx_str() );
            break;
        }
 
        visited.insert( parent.get() );
        aStack.push_back( parent->GetEmbeddedFiles() );
        parent = parent->GetParent().lock();
    }
}
 
 
std::set<KIFONT::OUTLINE_FONT*> LIB_SYMBOL::GetFonts() const
{
    using PERMISSION = KIFONT::OUTLINE_FONT::EMBEDDING_PERMISSION;
 
    std::set<KIFONT::OUTLINE_FONT*> fonts;
 
    auto processFont =
            [&]( KIFONT::FONT* font )
            {
                if( font && !font->IsStroke() )
                {
                    KIFONT::OUTLINE_FONT* outline = static_cast<KIFONT::OUTLINE_FONT*>( font );
                    PERMISSION            permission = outline->GetEmbeddingPermission();
 
                    if( permission == PERMISSION::EDITABLE || permission == PERMISSION::INSTALLABLE )
                        fonts.insert( outline );
                }
            };
 
    for( const SCH_ITEM& item : m_drawings )
    {
        // Use dynamic_cast to catch SCH_TEXTBOX, SCH_TABLECELL, etc.
        if( const SCH_TEXT* text = dynamic_cast<const SCH_TEXT*>( &item ) )
            processFont( text->GetFont() );
        else if( const SCH_FIELD* field = dynamic_cast<const SCH_FIELD*>( &item ) )
            processFont( field->GetFont() );
    }
 
    return fonts;
}
 
 
void LIB_SYMBOL::EmbedFonts()
{
    std::set<KIFONT::OUTLINE_FONT*> fonts = GetFonts();
 
    for( KIFONT::OUTLINE_FONT* font : fonts )
    {
        auto file = GetEmbeddedFiles()->AddFile( font->GetFileName(), false );
 
        if( !file )
        {
            wxLogTrace( "EMBED", "Failed to add font file: %s", font->GetFileName() );
            continue;
        }
 
        file->type = EMBEDDED_FILES::EMBEDDED_FILE::FILE_TYPE::FONT;
    }
}
 
static struct LIB_SYMBOL_DESC
{
    LIB_SYMBOL_DESC()
    {
        PROPERTY_MANAGER& propMgr = PROPERTY_MANAGER::Instance();
        REGISTER_TYPE( LIB_SYMBOL );
        propMgr.InheritsAfter( TYPE_HASH( LIB_SYMBOL ), TYPE_HASH( SYMBOL ) );
 
        const wxString groupFields = _HKI( "Fields" );
 
        propMgr.AddProperty( new PROPERTY<LIB_SYMBOL, wxString>( _HKI( "Reference" ),
                    &LIB_SYMBOL::SetRefProp, &LIB_SYMBOL::GetRefProp ),
                    groupFields );
        propMgr.AddProperty( new PROPERTY<LIB_SYMBOL, wxString>( _HKI( "Value" ),
                    &LIB_SYMBOL::SetValueProp, &LIB_SYMBOL::GetValueProp ),
                    groupFields );
        propMgr.AddProperty( new PROPERTY<LIB_SYMBOL, wxString>( _HKI( "Footprint" ),
                    &LIB_SYMBOL::SetFootprintProp, &LIB_SYMBOL::GetFootprintProp ),
                    groupFields );
        propMgr.AddProperty( new PROPERTY<LIB_SYMBOL, wxString>( _HKI( "Datasheet" ),
                    &LIB_SYMBOL::SetDatasheetProp, &LIB_SYMBOL::GetDatasheetProp ),
                    groupFields );
        propMgr.AddProperty( new PROPERTY<LIB_SYMBOL, wxString>( _HKI( "Keywords" ),
                    &LIB_SYMBOL::SetKeywordsProp, &LIB_SYMBOL::GetKeywordsProp ),
                    groupFields );
 
        const wxString groupSymbolDef = _HKI( "Symbol Definition" );
 
        propMgr.AddProperty( new PROPERTY<LIB_SYMBOL, bool>( _HKI( "Define as Power Symbol" ),
                    &LIB_SYMBOL::SetPowerSymbolProp, &LIB_SYMBOL::GetPowerSymbolProp ),
                    groupSymbolDef );
        propMgr.AddProperty( new PROPERTY<LIB_SYMBOL, bool>( _HKI( "Define as Local Power Symbol" ),
                    &LIB_SYMBOL::SetLocalPowerSymbolProp, &LIB_SYMBOL::GetLocalPowerSymbolProp ),
                    groupSymbolDef );
 
        const wxString groupPinDisplay = _HKI( "Pin Display" );
 
        propMgr.AddProperty( new PROPERTY<SYMBOL, bool>( _HKI( "Show Pin Number" ),
                    &SYMBOL::SetShowPinNumbers, &SYMBOL::GetShowPinNumbers ),
                    groupPinDisplay );
        propMgr.AddProperty( new PROPERTY<SYMBOL, bool>( _HKI( "Show Pin Name" ),
                    &SYMBOL::SetShowPinNames, &SYMBOL::GetShowPinNames ),
                    groupPinDisplay );
        propMgr.AddProperty( new PROPERTY<LIB_SYMBOL, bool>( _HKI( "Place Pin Names Inside" ),
                    &LIB_SYMBOL::SetPinNamesInsideProp, &LIB_SYMBOL::GetPinNamesInsideProp ),
                    groupPinDisplay );
        propMgr.AddProperty( new PROPERTY<SYMBOL, int>( _HKI( "Pin Name Position Offset" ),
                    &SYMBOL::SetPinNameOffset, &SYMBOL::GetPinNameOffset, PROPERTY_DISPLAY::PT_SIZE ),
                    groupPinDisplay );
 
        const wxString groupAttributes = _HKI( "Attributes" );
 
        propMgr.AddProperty( new PROPERTY<LIB_SYMBOL, bool>( _HKI( "Exclude from Simulation" ),
                    &LIB_SYMBOL::SetExcludedFromSimProp, &LIB_SYMBOL::GetExcludedFromSimProp ),
                    groupAttributes );
        propMgr.AddProperty( new PROPERTY<LIB_SYMBOL, bool>( _HKI( "Exclude from Board" ),
                    &LIB_SYMBOL::SetExcludedFromBoardProp, &LIB_SYMBOL::GetExcludedFromBoardProp ),
                    groupAttributes );
        propMgr.AddProperty( new PROPERTY<LIB_SYMBOL, bool>( _HKI( "Exclude from Bill of Materials" ),
                    &LIB_SYMBOL::SetExcludedFromBOMProp, &LIB_SYMBOL::GetExcludedFromBOMProp ),
                    groupAttributes );
        propMgr.AddProperty( new PROPERTY<LIB_SYMBOL, bool>( _HKI( "Exclude from Position Files" ),
                    &LIB_SYMBOL::SetExcludedFromPosFilesProp, &LIB_SYMBOL::GetExcludedFromPosFilesProp ),
                    groupAttributes );
 
        const wxString groupUnits = _HKI( "Units and Body Styles" );
 
        propMgr.AddProperty( new PROPERTY<LIB_SYMBOL, int>( _HKI( "Number of Symbol Units" ),
                        &LIB_SYMBOL::SetUnitProp, &LIB_SYMBOL::GetUnitProp ),
                        groupUnits );
        propMgr.AddProperty( new PROPERTY<LIB_SYMBOL, bool>( _HKI( "Units are Interchangeable" ),
                    &LIB_SYMBOL::SetUnitsInterchangeableProp, &LIB_SYMBOL::GetUnitsInterchangeableProp ),
                    groupUnits );
 
        auto multiBodyStyle =
                [=]( INSPECTABLE* aItem ) -> bool
                {
                    if( LIB_SYMBOL* symbol = dynamic_cast<LIB_SYMBOL*>( aItem ) )
                        return symbol->IsMultiBodyStyle();
 
                    return false;
                };
 
        propMgr.AddProperty( new PROPERTY<LIB_SYMBOL, wxString>( _HKI( "Body Styles" ),
                    &LIB_SYMBOL::SetBodyStyleProp, &LIB_SYMBOL::GetBodyStyleProp ),
                    groupUnits )
                .SetAvailableFunc( multiBodyStyle )
                .SetChoicesFunc( []( INSPECTABLE* aItem )
                                 {
                                     wxPGChoices choices;
 
                                     if( LIB_SYMBOL* symbol = dynamic_cast<LIB_SYMBOL*>( aItem ) )
                                     {
                                         for( int ii = 1; ii <= symbol->GetBodyStyleCount(); ii++ )
                                             choices.Add( symbol->GetBodyStyleDescription( ii, false ) );
                                     }
 
                                     return choices;
                                 } );
    }
} _LIB_SYMBOL_DESC;