symbol_library_manager.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2017 CERN
 * Copyright The KiCad Developers, see AUTHORS.txt for contributors.
 * @author Maciej Suminski <[email protected]>
 *
 * 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 3
 * 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 "symbol_library_manager.h"
 
#include <dialogs/html_message_box.h>
#include <symbol_edit_frame.h>
#include <env_paths.h>
#include <pgm_base.h>
#include <project_sch.h>
#include <kiway.h>
#include <core/profile.h>
#include <core/wx_stl_compat.h>
#include <unordered_map>
#include <wx_filename.h>
#include <sch_io/kicad_legacy/sch_io_kicad_legacy.h>
#include <progress_reporter.h>
#include <algorithm>
#include <list>
#include <locale_io.h>
#include <confirm.h>
#include <string_utils.h>
#include <wildcards_and_files_ext.h>
#include <kiplatform/io.h>
#include <libraries/library_manager.h>
#include <libraries/symbol_library_adapter.h>
 
#include "lib_logger.h"
 
 
SYMBOL_LIBRARY_MANAGER::SYMBOL_LIBRARY_MANAGER( SCH_BASE_FRAME& aFrame ) :
        m_frame( aFrame )
{
    m_logger = new LIB_LOGGER();
}
 
 
SYMBOL_LIBRARY_MANAGER::~SYMBOL_LIBRARY_MANAGER()
{
    delete m_logger;
}
 
 
bool SYMBOL_LIBRARY_MANAGER::HasModifications() const
{
    for( const auto& [name, buffer] : m_libs )
    {
        if( buffer.IsModified() )
            return true;
    }
 
    return false;
}
 
 
int SYMBOL_LIBRARY_MANAGER::GetHash() const
{
    SYMBOL_LIBRARY_ADAPTER* adapter = PROJECT_SCH::SymbolLibAdapter( &m_frame.Prj() );
    return adapter->GetModifyHash();
}
 
 
int SYMBOL_LIBRARY_MANAGER::GetLibraryHash( const wxString& aLibrary ) const
{
    if( const auto libBufIt = m_libs.find( aLibrary ); libBufIt != m_libs.end() )
        return libBufIt->second.GetHash();
 
    LIBRARY_MANAGER& manager = Pgm().GetLibraryManager();
 
    if( std::optional<wxString> uri = manager.GetFullURI( LIBRARY_TABLE_TYPE::SYMBOL, aLibrary, true ); uri )
    {
        // Mix a file modification timestamp into the hash so that external changes (e.g. a git
        // branch switch) are detected by the library tree synchronizer without a restart.
        wxFileName fn( *uri );
        long long  mtime = 0;
 
        wxLogNull silence;
 
        fn.Normalize( FN_NORMALIZE_FLAGS );
 
        if( fn.DirExists() )
        {
            mtime = KIPLATFORM::IO::TimestampDir( fn.GetFullPath(),
                        wxS( "*." ) + wxString( FILEEXT::KiCadSymbolLibFileExtension ) );
        }
        else if( fn.IsFileReadable() )
        {
            mtime = fn.GetModificationTime().GetValue().GetValue();
        }
 
        size_t base = std::hash<std::string>{}( aLibrary.ToStdString() + uri->ToStdString() );
        return static_cast<int>( base ^ static_cast<size_t>( mtime ) );
    }
 
    return -1;
}
 
 
wxArrayString SYMBOL_LIBRARY_MANAGER::GetLibraryNames() const
{
    wxArrayString res;
 
    LIBRARY_MANAGER& manager = Pgm().GetLibraryManager();
 
    for( const LIBRARY_TABLE_ROW* row : manager.Rows( LIBRARY_TABLE_TYPE::SYMBOL ) )
    {
        // Database libraries are hidden from the symbol editor at the moment
        if( row->Type() == SCH_IO_MGR::ShowType( SCH_IO_MGR::SCH_DATABASE ) )
            continue;
 
        res.Add( row->Nickname() );
    }
 
    res.Sort( []( const wxString& lhs, const wxString& rhs ) -> int
              {
                  return StrNumCmp( lhs, rhs, true );
              } );
 
    return res;
}
 
 
bool SYMBOL_LIBRARY_MANAGER::SaveLibrary( const wxString& aLibrary, const wxString& aFileName,
                                          SCH_IO_MGR::SCH_FILE_T aFileType )
{
    wxCHECK( aFileType != SCH_IO_MGR::SCH_FILE_T::SCH_LEGACY, false );
 
    wxFileName fn( aFileName );
 
    if( fn.FileExists() && !fn.IsFileWritable() )
        return false;
 
    IO_RELEASER<SCH_IO>         pi( SCH_IO_MGR::FindPlugin( aFileType ) );
    bool                        res = true;    // assume all libraries are successfully saved
    std::map<std::string, UTF8> properties;
 
    properties.emplace( SCH_IO_KICAD_LEGACY::PropBuffering, "" );
 
    auto it = m_libs.find( aLibrary );
 
    if( it != m_libs.end() )
    {
        // Handle buffered library
        LIB_BUFFER& libBuf = it->second;
 
        const std::deque<std::shared_ptr<SYMBOL_BUFFER>>& symbolBuffers = libBuf.GetBuffers();
 
        for( const std::shared_ptr<SYMBOL_BUFFER>& symbolBuf : symbolBuffers )
        {
            wxCHECK2( symbolBuf, continue );
 
            if( !libBuf.SaveBuffer( *symbolBuf, aFileName, &*pi, true ) )
            {
                // Something went wrong, but try to save other symbols
                res = false;
            }
        }
 
        // clear the deleted symbols buffer only if data is saved to the original file
        wxFileName original, destination( aFileName );
        LIBRARY_MANAGER& manager = Pgm().GetLibraryManager();
 
        if( std::optional<wxString> uri = manager.GetFullURI( LIBRARY_TABLE_TYPE::SYMBOL, aLibrary, true ); uri )
        {
            original = *uri;
            original.Normalize( FN_NORMALIZE_FLAGS | wxPATH_NORM_ENV_VARS );
        }
 
        destination.Normalize( FN_NORMALIZE_FLAGS | wxPATH_NORM_ENV_VARS );
 
        if( res && original == destination )
        {
            // Delete symbols that were removed from the buffer before clearing the deleted list
            for( const std::shared_ptr<SYMBOL_BUFFER>& deletedBuf : libBuf.GetDeletedBuffers() )
            {
                wxCHECK2( deletedBuf, continue );
 
                const wxString& originalName = deletedBuf->GetOriginal().GetName();
 
                try
                {
                    if( pi->LoadSymbol( aFileName, originalName ) )
                        pi->DeleteSymbol( aFileName, originalName, &properties );
                }
                catch( const IO_ERROR& ioe )
                {
                    wxLogError( _( "Error deleting symbol %s from library '%s'." ) + wxS( "\n%s" ),
                                UnescapeString( originalName ),
                                aFileName,
                                ioe.What() );
                    res = false;
                }
            }
 
            libBuf.ClearDeletedBuffer();
        }
    }
    else
    {
        // Handle original library
        for( LIB_SYMBOL* symbol : getOriginalSymbols( aLibrary ) )
        {
            try
            {
                if( symbol->IsDerived() )
                {
                    std::shared_ptr< LIB_SYMBOL > oldParent = symbol->GetParent().lock();
 
                    wxCHECK_MSG( oldParent, false,
                                 wxString::Format( wxT( "Derived symbol '%s' found with undefined parent." ),
                                                   symbol->GetName() ) );
 
                    LIB_SYMBOL* libParent = pi->LoadSymbol( aFileName, oldParent->GetName(), &properties );
 
                    if( !libParent )
                    {
                        std::unique_ptr<LIB_SYMBOL> newParent = std::make_unique<LIB_SYMBOL>( *oldParent );
                        pi->SaveSymbol( aFileName, std::move( newParent ), &properties );
 
                        // We cannot use the old parent after handing it to the plugin, we
                        // must borrow a new copy from the plugin cache to reparent the derived symbol.
                        libParent = pi->LoadSymbol( aFileName, oldParent->GetName(), &properties );
                    }
                    else
                    {
                        // Copy embedded files from the in-memory parent to the loaded parent
                        // This ensures that any embedded files added to the parent are preserved
                        //
                        // We do this manually rather than using the assignment operator to avoid
                        // potential ABI issues where the size of EMBEDDED_FILES differs between
                        // compilation units, potentially causing the assignment to overwrite
                        // members of LIB_SYMBOL (like m_me) that follow the EMBEDDED_FILES base.
                        libParent->ClearEmbeddedFiles();
 
                        for( const auto& [name, file] : oldParent->EmbeddedFileMap() )
                            libParent->AddFile( new EMBEDDED_FILES::EMBEDDED_FILE( *file ) );
 
                        libParent->SetAreFontsEmbedded( oldParent->GetAreFontsEmbedded() );
                        libParent->SetFileAddedCallback( oldParent->GetFileAddedCallback() );
                    }
 
                    std::unique_ptr<LIB_SYMBOL> newSymbol = std::make_unique<LIB_SYMBOL>( *symbol );
                    newSymbol->SetParent( libParent );
                    pi->SaveSymbol( aFileName, std::move( newSymbol ), &properties );
                }
                else if( !pi->LoadSymbol( aFileName, symbol->GetName(), &properties ) )
                {
                    pi->SaveSymbol( aFileName, std::make_unique<LIB_SYMBOL>( *symbol ), &properties );
                }
            }
            catch( ... )
            {
                res = false;
                break;
            }
        }
    }
 
    try
    {
        pi->SaveLibrary( aFileName );
    }
    catch( ... )
    {
        // return false because something happens.
        // The library is not successfully saved
        res = false;
    }
 
    return res;
}
 
 
bool SYMBOL_LIBRARY_MANAGER::IsLibraryModified( const wxString& aLibrary ) const
{
    auto it = m_libs.find( aLibrary );
    return it != m_libs.end() ? it->second.IsModified() : false;
}
 
 
bool SYMBOL_LIBRARY_MANAGER::IsSymbolModified( const wxString& aSymbolName, const wxString& aLibrary ) const
{
    auto libIt = m_libs.find( aLibrary );
 
    if( libIt == m_libs.end() )
        return false;
 
    const LIB_BUFFER&                    buf = libIt->second;
    const std::shared_ptr<SYMBOL_BUFFER> symbolBuf = buf.GetBuffer( aSymbolName );
 
    return symbolBuf ? symbolBuf->IsModified() : false;
}
 
 
void SYMBOL_LIBRARY_MANAGER::SetSymbolModified( const wxString& aSymbolName, const wxString& aLibrary )
{
    auto libIt = m_libs.find( aLibrary );
 
    if( libIt == m_libs.end() )
        return;
 
    const LIB_BUFFER&              buf = libIt->second;
    std::shared_ptr<SYMBOL_BUFFER> symbolBuf = buf.GetBuffer( aSymbolName );
 
    wxCHECK( symbolBuf, /* void */ );
 
    symbolBuf->GetScreen()->SetContentModified();
}
 
 
bool SYMBOL_LIBRARY_MANAGER::ClearLibraryModified( const wxString& aLibrary ) const
{
    auto libIt = m_libs.find( aLibrary );
 
    if( libIt == m_libs.end() )
        return false;
 
    for( const std::shared_ptr<SYMBOL_BUFFER>& symbolBuf : libIt->second.GetBuffers() )
    {
        SCH_SCREEN* screen = symbolBuf->GetScreen();
 
        if( screen )
            screen->SetContentModified( false );
    }
 
    return true;
}
 
 
bool SYMBOL_LIBRARY_MANAGER::ClearSymbolModified( const wxString& aSymbolName, const wxString& aLibrary ) const
{
    auto libIt = m_libs.find( aLibrary );
 
    if( libIt == m_libs.end() )
        return false;
 
    std::shared_ptr<SYMBOL_BUFFER> symbolBuf = libIt->second.GetBuffer( aSymbolName );
    wxCHECK( symbolBuf, false );
 
    symbolBuf->GetScreen()->SetContentModified( false );
    return true;
}
 
 
bool SYMBOL_LIBRARY_MANAGER::IsLibraryReadOnly( const wxString& aLibrary ) const
{
    SYMBOL_LIBRARY_ADAPTER* adapter = PROJECT_SCH::SymbolLibAdapter( &m_frame.Prj() );
    return !adapter->IsSymbolLibWritable( aLibrary );
}
 
 
bool SYMBOL_LIBRARY_MANAGER::IsLibraryLoaded( const wxString& aLibrary ) const
{
    SYMBOL_LIBRARY_ADAPTER* adapter = PROJECT_SCH::SymbolLibAdapter( &m_frame.Prj() );
    return adapter->IsLibraryLoaded( aLibrary );
}
 
 
std::list<LIB_SYMBOL*> SYMBOL_LIBRARY_MANAGER::EnumerateSymbols( const wxString& aLibrary ) const
{
    std::list<LIB_SYMBOL*> ret;
    auto libIt = m_libs.find( aLibrary );
 
    if( libIt != m_libs.end() )
    {
        for( const std::shared_ptr<SYMBOL_BUFFER>& symbolBuf : libIt->second.GetBuffers() )
            ret.push_back( &symbolBuf->GetSymbol() );
    }
    else
    {
        SYMBOL_LIBRARY_ADAPTER* adapter = PROJECT_SCH::SymbolLibAdapter( &m_frame.Prj() );
        std::vector<LIB_SYMBOL*> symbols = adapter->GetSymbols( aLibrary );
 
        std::copy( symbols.begin(), symbols.end(), std::back_inserter( ret ) );
    }
 
    return ret;
}
 
 
LIB_SYMBOL* SYMBOL_LIBRARY_MANAGER::GetBufferedSymbol( const wxString& aSymbolName, const wxString& aLibrary )
{
    // try the library buffers first
    LIB_BUFFER& libBuf = getLibraryBuffer( aLibrary );
    LIB_SYMBOL* bufferedSymbol = libBuf.GetSymbol( aSymbolName );
 
    if( !bufferedSymbol ) // no buffer symbol found
    {
        SYMBOL_LIBRARY_ADAPTER* adapter = PROJECT_SCH::SymbolLibAdapter( &m_frame.Prj() );
 
        // create a copy of the symbol
        try
        {
            LIB_SYMBOL* symbol = adapter->LoadSymbol( aLibrary, aSymbolName );
 
            if( symbol == nullptr )
                THROW_IO_ERROR( _( "Symbol not found." ) );
 
            LIB_SYMBOL* bufferedParent = nullptr;
 
            // Create parent symbols on demand so parent symbol can be set.
            if( symbol->IsDerived() )
            {
                std::shared_ptr<LIB_SYMBOL> parent = symbol->GetParent().lock();
                wxCHECK_MSG( parent, nullptr, wxString::Format( "Derived symbol '%s' found with undefined parent.",
                                                                symbol->GetName() ) );
 
                // Check if the parent symbol buffer has already be created.
                bufferedParent = libBuf.GetSymbol( parent->GetName() );
 
                if( !bufferedParent )
                {
                    std::unique_ptr<LIB_SYMBOL> newParent = std::make_unique<LIB_SYMBOL>( *parent );
                    bufferedParent = newParent.get();
                    libBuf.CreateBuffer( std::move( newParent ), std::make_unique<SCH_SCREEN>() );
                }
            }
 
            std::unique_ptr<LIB_SYMBOL> newSymbol = std::make_unique<LIB_SYMBOL>( *symbol );
            bufferedSymbol = newSymbol.get();
 
            if( bufferedParent )
                newSymbol->SetParent( bufferedParent );
 
            libBuf.CreateBuffer( std::move( newSymbol ), std::make_unique<SCH_SCREEN>() );
        }
        catch( const IO_ERROR& e )
        {
            wxString msg;
 
            msg.Printf( _( "Error loading symbol %s from library '%s'." ),
                        aSymbolName,
                        aLibrary );
            DisplayErrorMessage( &m_frame, msg, e.What() );
            bufferedSymbol = nullptr;
        }
    }
 
    return bufferedSymbol;
}
 
 
SCH_SCREEN* SYMBOL_LIBRARY_MANAGER::GetScreen( const wxString& aSymbolName, const wxString& aLibrary )
{
    auto it = m_libs.find( aLibrary );
    wxCHECK( it != m_libs.end(), nullptr );
 
    LIB_BUFFER&                    buf = it->second;
    std::shared_ptr<SYMBOL_BUFFER> symbolBuf = buf.GetBuffer( aSymbolName );
 
    return symbolBuf ? symbolBuf->GetScreen() : nullptr;
}
 
 
SYMBOL_BUFFER* SYMBOL_LIBRARY_MANAGER::GetBuffer( const wxString& aSymbolName, const wxString& aLibrary )
{
    if( !LibraryExists( aLibrary ) )
        return nullptr;
 
    LIB_BUFFER& libBuf = getLibraryBuffer( aLibrary );
 
    // Buffers live as long as the manager, so the raw pointer dangles only if a caller outlives it.
    return libBuf.GetBuffer( aSymbolName ).get();
}
 
 
bool SYMBOL_LIBRARY_MANAGER::UpdateSymbol( LIB_SYMBOL* aSymbol, const wxString& aLibrary )
{
    LIB_BUFFER&                    libBuf = getLibraryBuffer( aLibrary );
    std::shared_ptr<SYMBOL_BUFFER> symbolBuf = libBuf.GetBuffer( aSymbol->GetName() );
 
    if( symbolBuf )     // Existing symbol.
    {
        LIB_SYMBOL& bufferedSymbol = symbolBuf->GetSymbol();
 
        // If we are coming from a different library, the library ID needs to be preserved
        const LIB_ID libId = bufferedSymbol.GetLibId();
        bufferedSymbol = *aSymbol;
        bufferedSymbol.SetLibId( libId );
 
        symbolBuf->GetScreen()->SetContentModified();
    }
    else                // New symbol
    {
        std::unique_ptr<LIB_SYMBOL> symbolCopy = std::make_unique<LIB_SYMBOL>( *aSymbol, nullptr );
 
        symbolCopy->SetLibId( LIB_ID( aLibrary, aSymbol->GetLibId().GetLibItemName() ) );
 
        std::unique_ptr<SCH_SCREEN> newScreen = std::make_unique<SCH_SCREEN>();
        newScreen->SetContentModified();
 
        libBuf.CreateBuffer( std::move( symbolCopy ), std::move( newScreen ), true );
    }
 
    return true;
}
 
 
bool SYMBOL_LIBRARY_MANAGER::UpdateSymbolAfterRename( LIB_SYMBOL* aSymbol, const wxString& aOldName,
                                                      const wxString& aLibrary )
{
    LIB_BUFFER&                    libBuf = getLibraryBuffer( aLibrary );
    std::shared_ptr<SYMBOL_BUFFER> symbolBuf = libBuf.GetBuffer( aOldName );
 
    wxCHECK( symbolBuf && aSymbol, false );
 
    libBuf.UpdateBuffer( *symbolBuf, *aSymbol );
    OnDataChanged();
 
    return true;
}
 
 
LIB_ID SYMBOL_LIBRARY_MANAGER::RevertSymbol( const LIB_ID& aIdToRevert )
{
    auto it = m_libs.find( aIdToRevert.GetLibNickname() );
 
    if( it == m_libs.end() )    // no items to flush
        return aIdToRevert;
 
    std::shared_ptr<SYMBOL_BUFFER> symbolBuf = it->second.GetBuffer( aIdToRevert.GetLibItemName() );
    wxCHECK( symbolBuf, aIdToRevert );
    LIB_SYMBOL original( symbolBuf->GetOriginal() );
 
    if( original.GetName() != aIdToRevert.GetLibItemName().wx_str() )
    {
        UpdateSymbolAfterRename( &original, aIdToRevert.GetLibItemName(), aIdToRevert.GetLibNickname() );
    }
    else
    {
        // copy the initial data to the current symbol to restore
        symbolBuf->GetSymbol() = original;
        OnDataChanged();
    }
 
    return LIB_ID( aIdToRevert.GetLibNickname(), original.GetName() );
}
 
 
bool SYMBOL_LIBRARY_MANAGER::RevertLibrary( const wxString& aLibrary )
{
    auto it = m_libs.find( aLibrary );
 
    if( it == m_libs.end() )    // nothing to reverse
        return false;
 
    m_libs.erase( it );
    OnDataChanged();
 
    return true;
}
 
 
bool SYMBOL_LIBRARY_MANAGER::RevertAll()
{
    bool retv = true;
 
    // Nothing to revert.
    if( GetHash() == 0 )
        return true;
 
    for( auto& [libName, libBuffer] : m_libs )
    {
        if( !libBuffer.IsModified() )
            continue;
 
        // A buffer could be modified and then deleted, so make sure it's replaced on the
        // active list first, and any previous changes can then be reverted below.
        libBuffer.RevertDeletedBuffers();
 
        for( const std::shared_ptr<SYMBOL_BUFFER>& buffer : libBuffer.GetBuffers() )
        {
            if( !buffer->IsModified() )
                continue;
 
            RevertSymbol( LIB_ID( libName, buffer->GetOriginal().GetName() ) );
        }
 
        libBuffer.RevertAddedBuffers();
    }
 
    return retv;
}
 
 
bool SYMBOL_LIBRARY_MANAGER::RemoveSymbol( const wxString& aSymbolName, const wxString& aLibrary )
{
    LIB_BUFFER&                    libBuf = getLibraryBuffer( aLibrary );
    std::shared_ptr<SYMBOL_BUFFER> symbolBuf = libBuf.GetBuffer( aSymbolName );
    wxCHECK( symbolBuf, false );
 
    bool retv = true;
 
    retv &= libBuf.DeleteBuffer( *symbolBuf );
    OnDataChanged();
 
    return retv;
}
 
 
LIB_SYMBOL* SYMBOL_LIBRARY_MANAGER::GetSymbol( const wxString& aSymbolName, const wxString& aLibrary ) const
{
    // Try the library buffers first
    auto libIt = m_libs.find( aLibrary );
 
    if( libIt != m_libs.end() )
    {
        LIB_SYMBOL* symbol = libIt->second.GetSymbol( aSymbolName );
 
        if( symbol )
            return symbol;
    }
 
    // Get the original symbol
    SYMBOL_LIBRARY_ADAPTER* adapter = PROJECT_SCH::SymbolLibAdapter( &m_frame.Prj() );
    LIB_SYMBOL* symbol = nullptr;
 
    try
    {
        symbol = adapter->LoadSymbol( aLibrary, aSymbolName );
    }
    catch( const IO_ERROR& e )
    {
        wxString msg;
 
        msg.Printf( _( "Cannot load symbol '%s' from library '%s'." ),
                    aSymbolName,
                    aLibrary );
        DisplayErrorMessage( &m_frame, msg, e.What() );
    }
 
    return symbol;
}
 
 
bool SYMBOL_LIBRARY_MANAGER::SymbolExists( const wxString& aSymbolName, const wxString& aLibrary ) const
{
    auto        libBufIt = m_libs.find( aLibrary );
    LIB_SYMBOL* symbol = nullptr;
 
    if( libBufIt != m_libs.end() )
        return libBufIt->second.GetBuffer( aSymbolName ) != nullptr;
 
    SYMBOL_LIBRARY_ADAPTER* adapter = PROJECT_SCH::SymbolLibAdapter( &m_frame.Prj() );
 
    try
    {
        symbol = adapter->LoadSymbol( aLibrary, aSymbolName );
    }
    catch( IO_ERROR& )
    {
        // checking if certain symbol exists, so its absence is perfectly fine
    }
 
    return symbol != nullptr;
}
 
 
bool SYMBOL_LIBRARY_MANAGER::SymbolNameInUse( const wxString& aName, const wxString& aLibrary )
{
    wxArrayString existing;
 
    // NB: GetSymbolNames() is mostly used for GUI stuff, so it returns unescaped names
    GetSymbolNames( aLibrary, existing );
 
    wxString unescapedName = UnescapeString( aName );
 
    for( wxString& candidate : existing )
    {
        if( candidate.CmpNoCase( unescapedName ) == 0 )
            return true;
    }
 
    return false;
}
 
 
bool SYMBOL_LIBRARY_MANAGER::LibraryExists( const wxString& aLibrary, bool aCheckEnabled ) const
{
    if( aLibrary.IsEmpty() )
        return false;
 
    if( m_libs.count( aLibrary ) > 0 )
        return true;
 
    SYMBOL_LIBRARY_ADAPTER* adapter = PROJECT_SCH::SymbolLibAdapter( &m_frame.Prj() );
 
    return adapter->HasLibrary( aLibrary, aCheckEnabled );
}
 
 
wxString SYMBOL_LIBRARY_MANAGER::GetUniqueLibraryName() const
{
    wxString name = "New_Library";
 
    if( !LibraryExists( name ) )
        return name;
 
    name += "_";
 
    for( unsigned int i = 0; i < std::numeric_limits<unsigned int>::max(); ++i )
    {
        if( !LibraryExists( name + wxString::Format( "%u", i ) ) )
            return name + wxString::Format( "%u", i );
    }
 
    wxFAIL;
    return wxEmptyString;
}
 
 
void SYMBOL_LIBRARY_MANAGER::GetSymbolNames( const wxString& aLibraryName, wxArrayString& aSymbolNames,
                                             SYMBOL_NAME_FILTER aFilter )
{
    LIB_BUFFER& libBuf = getLibraryBuffer( aLibraryName );
 
    libBuf.GetSymbolNames( aSymbolNames, aFilter );
}
 
 
size_t SYMBOL_LIBRARY_MANAGER::GetDerivedSymbolNames( const wxString& aSymbolName, const wxString& aLibraryName,
                                                      wxArrayString& aList )
{
    LIB_BUFFER& libBuf = getLibraryBuffer( aLibraryName );
 
    return libBuf.GetDerivedSymbolNames( aSymbolName, aList );
}
 
 
bool SYMBOL_LIBRARY_MANAGER::HasDerivedSymbols( const wxString& aSymbolName, const wxString& aLibraryName )
{
    LIB_BUFFER& libBuf = getLibraryBuffer( aLibraryName );
 
    return libBuf.HasDerivedSymbols( aSymbolName );
}
 
 
size_t SYMBOL_LIBRARY_MANAGER::GetLibraryCount() const
{
    SYMBOL_LIBRARY_ADAPTER* adapter = PROJECT_SCH::SymbolLibAdapter( &m_frame.Prj() );
    return adapter->GetLibraryNames().size();
}
 
 
wxString SYMBOL_LIBRARY_MANAGER::getLibraryName( const wxString& aFilePath )
{
    wxFileName fn( aFilePath );
    return fn.GetName();
}
 
 
bool SYMBOL_LIBRARY_MANAGER::addLibrary( const wxString& aFilePath, bool aCreate, LIBRARY_TABLE_SCOPE aScope )
{
    wxString libName = getLibraryName( aFilePath );
    wxCHECK( !LibraryExists( libName ), false );  // either create or add an existing one
 
    // try to use path normalized to an environmental variable or project path
    wxString relPath = NormalizePath( aFilePath, &Pgm().GetLocalEnvVariables(), &m_frame.Prj() );
 
    SCH_IO_MGR::SCH_FILE_T schFileType = SCH_IO_MGR::GuessPluginTypeFromLibPath( aFilePath, aCreate ? KICTL_CREATE
                                                                                                    : 0 );
 
    if( schFileType == SCH_IO_MGR::SCH_FILE_UNKNOWN )
        schFileType = SCH_IO_MGR::SCH_LEGACY;
 
    SYMBOL_LIBRARY_ADAPTER*       adapter = PROJECT_SCH::SymbolLibAdapter( &m_frame.Prj() );
    LIBRARY_MANAGER&              manager = Pgm().GetLibraryManager();
    std::optional<LIBRARY_TABLE*> optTable = manager.Table( LIBRARY_TABLE_TYPE::SYMBOL, aScope );
 
    wxCHECK( optTable, false );
    LIBRARY_TABLE* table = optTable.value();
 
    try
    {
        bool               success = true;
        LIBRARY_TABLE_ROW& row = table->InsertRow();
 
        row.SetNickname( libName );
        row.SetURI( relPath );
        row.SetType( SCH_IO_MGR::ShowType( schFileType ) );
 
        table->Save().map_error(
                [&]( const LIBRARY_ERROR& aError )
                {
                    wxMessageBox( _( "Error saving library table:\n\n" ) + aError.message,
                                  _( "File Save Error" ), wxOK | wxICON_ERROR );
                    success = false;
                } );
 
        if( !success )
            return false;
 
        if( aCreate )
        {
            wxCHECK( schFileType != SCH_IO_MGR::SCH_FILE_T::SCH_LEGACY, false );
 
            if( !adapter->CreateLibrary( libName ) )
            {
                table->Rows().erase( table->Rows().end() - 1 );
 
                table->Save().map_error(
                        [&]( const LIBRARY_ERROR& aError )
                        {
                            wxMessageBox( _( "Error saving library table:\n\n" ) + aError.message,
                                          _( "File Save Error" ), wxOK | wxICON_ERROR );
                        } );
 
                return false;
            }
        }
 
        adapter->LoadOne( libName );
        OnDataChanged();
    }
    catch( const IO_ERROR& ioe )
    {
        DisplayError( nullptr, ioe.What() );
        return false;
    }
 
    return true;
}
 
 
std::set<LIB_SYMBOL*> SYMBOL_LIBRARY_MANAGER::getOriginalSymbols( const wxString& aLibrary )
{
    std::set<LIB_SYMBOL*> symbols;
    wxCHECK( LibraryExists( aLibrary ), symbols );
 
    SYMBOL_LIBRARY_ADAPTER* adapter = PROJECT_SCH::SymbolLibAdapter( &m_frame.Prj() );
 
    for( LIB_SYMBOL* symbol : adapter->GetSymbols( aLibrary ) )
        symbols.insert( symbol );
 
    return symbols;
}
 
 
LIB_BUFFER& SYMBOL_LIBRARY_MANAGER::getLibraryBuffer( const wxString& aLibrary )
{
    auto it = m_libs.find( aLibrary );
 
    if( it != m_libs.end() )
        return it->second;
 
    // The requested buffer does not exist yet, so create one
    auto ret = m_libs.emplace( aLibrary, LIB_BUFFER( aLibrary ) );
    LIB_BUFFER& buf = ret.first->second;
 
    for( LIB_SYMBOL* symbol : getOriginalSymbols( aLibrary ) )
    {
        if( symbol->IsDerived() )
        {
            std::shared_ptr<LIB_SYMBOL> oldParent = symbol->GetParent().lock();
 
            wxCHECK_MSG( oldParent, buf, wxString::Format( "Derived symbol '%s' found with undefined parent.",
                                                           symbol->GetName() ) );
 
            LIB_SYMBOL* libParent = buf.GetSymbol( oldParent->GetName() );
 
            if( !libParent )
            {
                std::unique_ptr<LIB_SYMBOL> newParent = std::make_unique<LIB_SYMBOL>( *oldParent.get() );
                libParent = newParent.get();
                buf.CreateBuffer( std::move( newParent ), std::make_unique<SCH_SCREEN>() );
            }
 
            std::unique_ptr<LIB_SYMBOL> newSymbol = std::make_unique<LIB_SYMBOL>( *symbol );
            newSymbol->SetParent( libParent );
            buf.CreateBuffer( std::move( newSymbol ), std::make_unique<SCH_SCREEN>() );
        }
        else if( !buf.GetSymbol( symbol->GetName() ) )
        {
            buf.CreateBuffer( std::make_unique<LIB_SYMBOL>( *symbol ), std::make_unique<SCH_SCREEN>() );
        }
    }
 
    return buf;
}
 
 
bool SYMBOL_LIBRARY_MANAGER::UpdateLibraryBuffer( const wxString& aLibrary )
{
    try
    {
        m_libs.erase( aLibrary );
        getLibraryBuffer( aLibrary );
    }
    catch( const std::exception& e )
    {
        wxLogError( _( "Error updating library buffer: %s" ), e.what() );
        return false;
    }
    catch(...)
    {
        wxLogError( _( "Error updating library buffer." ) );
        return false;
    }
 
    getLibraryBuffer( aLibrary );
 
    return true;
}
 
 
SYMBOL_BUFFER::SYMBOL_BUFFER( std::unique_ptr<LIB_SYMBOL> aSymbol, std::unique_ptr<SCH_SCREEN> aScreen ) :
        m_screen( std::move( aScreen ) ),
        m_symbol( std::move( aSymbol ) )
{
    wxASSERT( m_symbol );
    m_original = std::make_unique<LIB_SYMBOL>( *m_symbol );
    wxASSERT( m_original );
}
 
 
SYMBOL_BUFFER::~SYMBOL_BUFFER()
{
}
 
 
void SYMBOL_BUFFER::SetSymbol( std::unique_ptr<LIB_SYMBOL> aSymbol )
{
    wxCHECK( m_symbol != aSymbol, /* void */ );
    wxASSERT( aSymbol );
    m_symbol = std::move( aSymbol );
 
    // If the symbol moves libraries then the original moves with it
    if( m_original->GetLibId().GetLibNickname() != m_symbol->GetLibId().GetLibNickname() )
    {
        m_original->SetLibId( LIB_ID( m_symbol->GetLibId().GetLibNickname(),
                                      m_original->GetLibId().GetLibItemName() ) );
    }
}
 
 
void SYMBOL_BUFFER::SetOriginal( std::unique_ptr<LIB_SYMBOL> aSymbol )
{
    wxCHECK( m_original != aSymbol, /* void */ );
    wxASSERT( aSymbol );
    m_original = std::move( aSymbol );
 
    // The original is not allowed to have a different library than its symbol
    if( m_original->GetLibId().GetLibNickname() != m_symbol->GetLibId().GetLibNickname() )
    {
        m_original->SetLibId( LIB_ID( m_symbol->GetLibId().GetLibNickname(),
                                      m_original->GetLibId().GetLibItemName() ) );
    }
}
 
 
bool SYMBOL_BUFFER::IsModified() const
{
    return m_screen && m_screen->IsContentModified();
}
 
 
LIB_SYMBOL* LIB_BUFFER::GetSymbol( const wxString& aAlias ) const
{
    std::shared_ptr<SYMBOL_BUFFER> buf = GetBuffer( aAlias );
 
    if( !buf )
        return nullptr;
 
    return &buf->GetSymbol();
}
 
 
bool LIB_BUFFER::CreateBuffer( std::unique_ptr<LIB_SYMBOL> aCopy, std::unique_ptr<SCH_SCREEN> aScreen, bool aNew )
{
    wxASSERT( aCopy );
    wxASSERT( aCopy->GetLib() == nullptr );
 
    // Set the parent library name,
    // otherwise it is empty as no library has been given as the owner during object construction
    LIB_ID libId = aCopy->GetLibId();
    libId.SetLibNickname( m_libName );
    aCopy->SetLibId( libId );
 
    std::shared_ptr<SYMBOL_BUFFER> symbolBuf = std::make_shared<SYMBOL_BUFFER>( std::move( aCopy ),
                                                                                std::move( aScreen ) );
    m_symbols.push_back( std::move( symbolBuf ) );
 
    if( aNew )
        m_added.push_back( m_symbols.back() );
 
    ++m_hash;
 
    return true;
}
 
 
bool LIB_BUFFER::UpdateBuffer( SYMBOL_BUFFER& aSymbolBuf, const LIB_SYMBOL& aCopy )
{
    LIB_SYMBOL& bufferedSymbol = aSymbolBuf.GetSymbol();
 
    bufferedSymbol = aCopy;
    ++m_hash;
 
    return true;
}
 
 
bool LIB_BUFFER::DeleteBuffer( const SYMBOL_BUFFER& aSymbolBuf )
{
    const auto sameBufferPredicate =
            [&]( const std::shared_ptr<SYMBOL_BUFFER>& aBuf )
            {
                return aBuf.get() == &aSymbolBuf;
            };
 
    wxCHECK( std::any_of( m_symbols.begin(), m_symbols.end(), sameBufferPredicate ), false );
 
    bool retv = true;
 
    // Remove all derived symbols to prevent broken inheritance.
    if( HasDerivedSymbols( aSymbolBuf.GetSymbol().GetName() )
        && ( removeChildSymbols( aSymbolBuf ) == 0 ) )
    {
        retv = false;
    }
 
    // Erasing the children invalidated any earlier iterator into the deque
    auto symbolBufIt = std::find_if( m_symbols.begin(), m_symbols.end(), sameBufferPredicate );
    wxCHECK( symbolBufIt != m_symbols.end(), false );
 
    m_deleted.emplace_back( *symbolBufIt );
    m_symbols.erase( symbolBufIt );
    ++m_hash;
 
    return retv;
}
 
 
void LIB_BUFFER::RevertDeletedBuffers()
{
    for( std::shared_ptr<SYMBOL_BUFFER>& buffer : m_deleted )
        m_symbols.emplace_back( buffer );
 
    m_deleted.clear();
    ++m_hash;
}
 
 
void LIB_BUFFER::RevertAddedBuffers()
{
    std::erase_if( m_symbols,
                   [&]( const std::shared_ptr<SYMBOL_BUFFER>& item )
                   {
                       for( const std::shared_ptr<SYMBOL_BUFFER>& added : m_added )
                       {
                           if( added.get() == item.get() )
                               return true;
                       }
 
                       return false;
                   } );
 
    m_added.clear();
    ++m_hash;
}
 

static wxString getParentName( const SYMBOL_BUFFER& aSymbolBuf )
{
    std::shared_ptr<LIB_SYMBOL> parent = aSymbolBuf.GetSymbol().GetParent().lock();
 
    return parent ? parent->GetName() : wxString();
}
 
 
bool LIB_BUFFER::SaveBuffer( SYMBOL_BUFFER& aSymbolBuf, const wxString& aFileName, SCH_IO* aPlugin,
                             bool aBuffer )
{
    wxCHECK( !aFileName.IsEmpty(), false );
 
    wxString errorMsg = _( "Error saving symbol %s to library '%s'." ) + wxS( "\n%s" );
 
    // Set properties to prevent saving the file on every symbol save.
    std::map<std::string, UTF8> properties;
    properties.emplace( SCH_IO_KICAD_LEGACY::PropBuffering, "" );
 
    LIB_SYMBOL& libSymbol = aSymbolBuf.GetSymbol();
 
    // Collect symbols that are *directly* derived from this symbol before renaming it
    wxArrayString derivedSymbols;
 
    for( const std::shared_ptr<SYMBOL_BUFFER>& buf : m_symbols )
    {
        if( getParentName( *buf ) == libSymbol.GetName() )
            derivedSymbols.push_back( buf->GetSymbol().GetName() );
    }
 
    {
        LIB_SYMBOL&    originalSymbol = aSymbolBuf.GetOriginal();
        const wxString originalName = originalSymbol.GetName();
 
        // Delete the original symbol if the symbol name has been changed.
        if( libSymbol.GetName() != originalSymbol.GetName() )
        {
            try
            {
                if( aPlugin->LoadSymbol( aFileName, originalName ) )
                    aPlugin->DeleteSymbol( aFileName, originalName, &properties );
            }
            catch( const IO_ERROR& ioe )
            {
                wxLogError( errorMsg, UnescapeString( originalName ), aFileName, ioe.What() );
                return false;
            }
        }
    }
 
    if( libSymbol.IsDerived() )
    {
        std::unique_ptr<LIB_SYMBOL> newCachedSymbol = std::make_unique<LIB_SYMBOL>( libSymbol );
        std::shared_ptr<LIB_SYMBOL> bufferedParent = libSymbol.GetParent().lock();
 
        wxCHECK( bufferedParent, false );
 
        // A borrowed pointer to the cached parent symbol in the library.
        LIB_SYMBOL* cachedParent = nullptr;
 
        try
        {
            cachedParent = aPlugin->LoadSymbol( aFileName, bufferedParent->GetName() );
        }
        catch( const IO_ERROR& )
        {
            return false;
        }
 
        if( !cachedParent )
        {
            // The parent symbol does not exist in the library, so we need to save it first.
 
            std::unique_ptr<LIB_SYMBOL> newParent = std::make_unique<LIB_SYMBOL>( *bufferedParent );
            newCachedSymbol->SetParent( newParent.get() );
 
            const wxString cachedParentName = newParent->GetName();
 
            try
            {
                aPlugin->SaveSymbol( aFileName, std::move( newParent ), aBuffer ? &properties : nullptr );
            }
            catch( const IO_ERROR& ioe )
            {
                wxLogError( errorMsg, UnescapeString( cachedParentName ), aFileName, ioe.What() );
                return false;
            }
 
            const wxString newCachedSymbolName = newCachedSymbol->GetName();
 
            try
            {
                aPlugin->SaveSymbol( aFileName, std::move( newCachedSymbol ), aBuffer ? &properties : nullptr );
            }
            catch( const IO_ERROR& ioe )
            {
                wxLogError( errorMsg, UnescapeString( newCachedSymbolName ), aFileName, ioe.What() );
                return false;
            }
 
            std::unique_ptr<LIB_SYMBOL> originalParent = std::make_unique<LIB_SYMBOL>( *bufferedParent );
            LIB_SYMBOL&                 parentRef = *originalParent;
            aSymbolBuf.SetOriginal( std::move( originalParent ) );
 
            std::unique_ptr<LIB_SYMBOL> newSymbol = std::make_unique<LIB_SYMBOL>( libSymbol );
            newSymbol->SetParent( &parentRef );
            aSymbolBuf.SetOriginal( std::move( newSymbol ) );
        }
        else
        {
            // Copy embedded files from the buffered parent to the cached parent
            // This ensures that any embedded files added to the parent are preserved
            //
            // We do this manually rather than using the assignment operator to avoid
            // potential ABI issues where the size of EMBEDDED_FILES differs between
            // compilation units, potentially causing the assignment to overwrite
            // members of LIB_SYMBOL (like m_me) that follow the EMBEDDED_FILES base.
            cachedParent->ClearEmbeddedFiles();
 
            for( const auto& [name, file] : bufferedParent->EmbeddedFileMap() )
                cachedParent->AddFile( new EMBEDDED_FILES::EMBEDDED_FILE( *file ) );
 
            cachedParent->SetAreFontsEmbedded( bufferedParent->GetAreFontsEmbedded() );
            cachedParent->SetFileAddedCallback( bufferedParent->GetFileAddedCallback() );
 
            newCachedSymbol->SetParent( cachedParent );
 
            const wxString newCachedSymbolName = newCachedSymbol->GetName();
 
            try
            {
                aPlugin->SaveSymbol( aFileName, std::move( newCachedSymbol ), aBuffer ? &properties : nullptr );
            }
            catch( const IO_ERROR& ioe )
            {
                wxLogError( errorMsg, UnescapeString( newCachedSymbolName ), aFileName, ioe.What() );
                return false;
            }
 
            std::shared_ptr<SYMBOL_BUFFER> originalBufferedParent = GetBuffer( bufferedParent->GetName() );
            wxCHECK( originalBufferedParent, false );
 
            std::unique_ptr<LIB_SYMBOL> newSymbol = std::make_unique<LIB_SYMBOL>( libSymbol );
            newSymbol->SetParent( &originalBufferedParent->GetSymbol() );
            aSymbolBuf.SetOriginal( std::move( newSymbol ) );
        }
    }
    else
    {
        std::unique_ptr<LIB_SYMBOL> newSymbol = std::make_unique<LIB_SYMBOL>( libSymbol );
 
        try
        {
            aPlugin->SaveSymbol( aFileName, std::move( newSymbol ), aBuffer ? &properties : nullptr );
        }
        catch( const IO_ERROR& ioe )
        {
            wxLogError( errorMsg, UnescapeString( libSymbol.GetName() ), aFileName, ioe.What() );
            return false;
        }
 
        aSymbolBuf.SetOriginal( std::make_unique<LIB_SYMBOL>( libSymbol ) );
    }
 
    bool res = true;
 
    // Reparent all symbols derived from the saved symbol.
    if( !derivedSymbols.IsEmpty() )
    {
        // The saved copy is owned by the plugin cache. Borrow it back to reparent the
        // derived symbols. The lookup cannot normally fail since it was just added.
        LIB_SYMBOL* parentSymbol = aPlugin->LoadSymbol( aFileName, libSymbol.GetName(), aBuffer ? &properties
                                                                                                : nullptr );
 
        wxCHECK_MSG( parentSymbol, false, wxS( "Failed to borrow the saved symbol back from the plugin cache." ) );
 
        // Save the derived symbols.
        for( const wxString& entry : derivedSymbols )
        {
            std::shared_ptr<SYMBOL_BUFFER> symbol = GetBuffer( entry );
 
            wxCHECK2( symbol, continue );
 
            std::unique_ptr<LIB_SYMBOL> derivedSymbol = std::make_unique<LIB_SYMBOL>( symbol->GetSymbol() );
 
            derivedSymbol->SetParent( parentSymbol );
 
            const wxString derivedSymbolName = derivedSymbol->GetName();
 
            try
            {
                aPlugin->SaveSymbol( aFileName, std::move( derivedSymbol ), aBuffer ? &properties : nullptr );
            }
            catch( const IO_ERROR& ioe )
            {
                wxLogError( errorMsg, UnescapeString( derivedSymbolName ), aFileName, ioe.What() );
 
                // Something went wrong, but try to save other derived symbols
                res = false;
            }
        }
    }
 
    ++m_hash;
    return res;
}
 
 
std::shared_ptr<SYMBOL_BUFFER> LIB_BUFFER::GetBuffer( const wxString& aSymbolName ) const
{
    for( std::shared_ptr<SYMBOL_BUFFER> entry : m_symbols )
    {
        if( entry->GetSymbol().GetName() == aSymbolName )
            return entry;
    }
 
    return std::shared_ptr<SYMBOL_BUFFER>( nullptr );
}
 
 
bool LIB_BUFFER::HasDerivedSymbols( const wxString& aParentName ) const
{
    wxCHECK( !aParentName.IsEmpty(), false );
 
    for( const std::shared_ptr<SYMBOL_BUFFER>& entry : m_symbols )
    {
        if( getParentName( *entry ) == aParentName )
            return true;
    }
 
    return false;
}
 
 
void LIB_BUFFER::GetSymbolNames( wxArrayString& aSymbolNames, SYMBOL_NAME_FILTER aFilter )
{
    for( std::shared_ptr<SYMBOL_BUFFER>& entry : m_symbols )
    {
        const LIB_SYMBOL& symbol = entry->GetSymbol();
 
        if( ( symbol.IsDerived() && ( aFilter == SYMBOL_NAME_FILTER::ROOT_ONLY ) )
            || ( symbol.IsRoot() && ( aFilter == SYMBOL_NAME_FILTER::DERIVED_ONLY ) ) )
        {
            continue;
        }
 
        aSymbolNames.Add( UnescapeString( symbol.GetName() ) );
    }
}
 
 
size_t LIB_BUFFER::GetDerivedSymbolNames( const wxString& aSymbolName, wxArrayString& aList ) const
{
    wxCHECK( !aSymbolName.IsEmpty(), 0 );
 
    // Links resolve by parent name rather than by parent object, because a buffered child can
    // still point at an unbuffered copy of its parent
    std::unordered_map<wxString, std::vector<wxString>> derivedMap;
 
    // Resolve every parent link up front so the walk below is only map lookups
    for( const std::shared_ptr<SYMBOL_BUFFER>& entry : m_symbols )
    {
        const wxString parentName = getParentName( *entry );
 
        if( !parentName.IsEmpty() )
            derivedMap[parentName].emplace_back( entry->GetSymbol().GetName() );
    }
 
    // Seeded with the query so that a name cycle in a corrupt library neither recurses forever nor
    // reports the root as its own descendant, which would have removeChildSymbols() delete it
    std::set<wxString> visited{ aSymbolName };
 
    // Assign to std::function to allow recursion
    const std::function<void( const wxString& )> getDerived =
            [&]( const wxString& aParentName )
            {
                auto it = derivedMap.find( aParentName );
 
                if( it != derivedMap.end() )
                {
                    for( const wxString& derivedName : it->second )
                    {
                        if( !visited.insert( derivedName ).second )
                            continue;
 
                        aList.Add( derivedName );
 
                        // Recurse to get symbols derived from this one
                        getDerived( derivedName );
                    }
                }
            };
 
    // A name that is not buffered simply has no children here
    getDerived( aSymbolName );
 
    return aList.GetCount();
}
 
 
int LIB_BUFFER::removeChildSymbols( const SYMBOL_BUFFER& aSymbolBuf )
{
    int                                                  cnt = 0;
    wxArrayString                                        derivedSymbolNames;
    std::deque<std::shared_ptr<SYMBOL_BUFFER>>::iterator it;
 
    if( GetDerivedSymbolNames( aSymbolBuf.GetSymbol().GetName(), derivedSymbolNames ) )
    {
        for( const wxString& symbolName : derivedSymbolNames )
        {
            it = std::find_if( m_symbols.begin(), m_symbols.end(),
                               [symbolName]( std::shared_ptr<SYMBOL_BUFFER>& buf )
                               {
                                   return buf->GetSymbol().GetName() == symbolName;
                               } );
 
            wxCHECK2( it != m_symbols.end(), continue );
 
            m_deleted.emplace_back( *it );
            m_symbols.erase( it );
            cnt += 1;
        }
    }
 
    return cnt;
}