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 (C) 2019-2023 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, you may find one here:
 * https://www.gnu.org/licenses/gpl-3.0.html
 * or you may search the http://www.gnu.org website for the version 3 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
#include "symbol_library_manager.h"
 
#include <symbol_library.h>
#include <dialogs/html_message_box.h>
#include <symbol_edit_frame.h>
#include <symbol_lib_table.h>
#include <env_paths.h>
#include <pgm_base.h>
#include <project_sch.h>
#include <kiway.h>
#include <core/profile.h>
#include <wx_filename.h>
#include <sch_io/kicad_legacy/sch_io_kicad_legacy.h>
#include <symbol_async_loader.h>
#include <progress_reporter.h>
#include <list>
#include <locale_io.h>
#include <confirm.h>
#include <string_utils.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;
}
 
 
void SYMBOL_LIBRARY_MANAGER::Preload( PROGRESS_REPORTER& aReporter )
{
 SYMBOL_ASYNC_LOADER loader( symTable()->GetLogicalLibs(), symTable(), false, nullptr,
 &aReporter );
 
 LOCALE_IO toggle;
 
 loader.Start();
 
 while( !loader.Done() )
 {
 if( !aReporter.KeepRefreshing() )
 break;
 
 wxMilliSleep( 33 /* 30 FPS refresh rate */ );
 }
 
 loader.Join();
 
 if( !loader.GetErrors().IsEmpty() )
 {
 HTML_MESSAGE_BOX dlg( &m_frame, _( "Load Error" ) );
 
 dlg.MessageSet( _( "Errors loading symbols:" ) );
 
 wxString msg = loader.GetErrors();
 msg.Replace( "\n", "<BR>" );
 
 dlg.AddHTML_Text( msg );
 dlg.ShowModal();
 }
}
 
 
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
{
 int hash = symTable()->GetModifyHash();
 
 for( const auto& [name, buffer] : m_libs )
 hash += buffer.GetHash();
 
 return hash;
}
 
 
int SYMBOL_LIBRARY_MANAGER::GetLibraryHash( const wxString& aLibrary ) const
{
 const auto libBufIt = m_libs.find( aLibrary );
 
 if( libBufIt != m_libs.end() )
 return libBufIt->second.GetHash();
 
 SYMBOL_LIB_TABLE_ROW* row = GetLibrary( aLibrary );
 
 // return -1 if library does not exist or 0 if not modified
 return row ? std::hash<std::string>{}( aLibrary.ToStdString() +
 row->GetFullURI( true ).ToStdString() ) : -1;
}
 
 
wxArrayString SYMBOL_LIBRARY_MANAGER::GetLibraryNames() const
{
 wxArrayString res;
 
 for( const wxString& libName : symTable()->GetLogicalLibs() )
 {
 // Database libraries are hidden from the symbol editor at the moment
 if( GetLibrary( libName )->SchLibType() == SCH_IO_MGR::SCH_DATABASE )
 continue;
 
 res.Add( libName );
 }
 
 return res;
}
 
 
SYMBOL_LIB_TABLE_ROW* SYMBOL_LIBRARY_MANAGER::GetLibrary( const wxString& aLibrary ) const
{
 SYMBOL_LIB_TABLE_ROW* row = nullptr;
 
 try
 {
 row = symTable()->FindRow( aLibrary, true );
 }
 catch( const IO_ERROR& e )
 {
 wxString msg;
 
 msg.Printf( _( "Library '%s' not found in the Symbol Library Table." ), aLibrary );
 DisplayErrorMessage( &m_frame, msg, e.What() );
 }
 
 return row;
}
 
 
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 && LibraryExists( aLibrary ), false );
 wxFileName fn( aFileName );
 wxCHECK( !fn.FileExists() || fn.IsFileWritable(), 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 auto& 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 libraries
 res = false;
 }
 }
 
 // clear the deleted symbols buffer only if data is saved to the original file
 wxFileName original, destination( aFileName );
 SYMBOL_LIB_TABLE_ROW* row = GetLibrary( aLibrary );
 
 if( row )
 {
 original = row->GetFullURI();
 original.Normalize( FN_NORMALIZE_FLAGS | wxPATH_NORM_ENV_VARS );
 }
 
 destination.Normalize( FN_NORMALIZE_FLAGS | wxPATH_NORM_ENV_VARS );
 
 if( res && original == destination )
 libBuf.ClearDeletedBuffer();
 }
 else
 {
 // Handle original library
 for( LIB_SYMBOL* symbol : getOriginalSymbols( aLibrary ) )
 {
 LIB_SYMBOL* newSymbol;
 
 try
 {
 if( symbol->IsAlias() )
 {
 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( aLibrary, oldParent->GetName(),
 &properties );
 
 if( !libParent )
 {
 libParent = new LIB_SYMBOL( *oldParent.get() );
 pi->SaveSymbol( aLibrary, libParent, &properties );
 }
 
 newSymbol = new LIB_SYMBOL( *symbol );
 newSymbol->SetParent( libParent );
 pi->SaveSymbol( aLibrary, newSymbol, &properties );
 }
 else if( !pi->LoadSymbol( aLibrary, symbol->GetName(), &properties ) )
 {
 pi->SaveSymbol( aLibrary, new 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& aAlias,
 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( aAlias );
 
 return symbolBuf ? symbolBuf->IsModified() : false;
}
 
 
void SYMBOL_LIBRARY_MANAGER::SetSymbolModified( const wxString& aAlias, 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( aAlias );
 
 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( auto& symbolBuf : libIt->second.GetBuffers() )
 {
 SCH_SCREEN* screen = symbolBuf->GetScreen();
 
 if( screen )
 screen->SetContentModified( false );
 }
 
 return true;
}
 
 
bool SYMBOL_LIBRARY_MANAGER::ClearSymbolModified( const wxString& aAlias,
 const wxString& aLibrary ) const
{
 auto libIt = m_libs.find( aLibrary );
 
 if( libIt == m_libs.end() )
 return false;
 
 auto symbolBuf = libIt->second.GetBuffer( aAlias );
 wxCHECK( symbolBuf, false );
 
 symbolBuf->GetScreen()->SetContentModified( false );
 return true;
}
 
 
bool SYMBOL_LIBRARY_MANAGER::IsLibraryReadOnly( const wxString& aLibrary ) const
{
 wxCHECK( LibraryExists( aLibrary ), true );
 
 return !symTable()->IsSymbolLibWritable( aLibrary );
}
 
 
bool SYMBOL_LIBRARY_MANAGER::IsLibraryLoaded( const wxString& aLibrary ) const
{
 wxCHECK( LibraryExists( aLibrary ), false );
 
 return symTable()->IsSymbolLibLoaded( aLibrary );
}
 
 
std::list<LIB_SYMBOL*> SYMBOL_LIBRARY_MANAGER::GetAliases( const wxString& aLibrary ) const
{
 std::list<LIB_SYMBOL*> ret;
 wxCHECK( LibraryExists( aLibrary ), 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
 {
 std::vector<LIB_SYMBOL*> aliases;
 
 try
 {
 symTable()->LoadSymbolLib( aliases, aLibrary );
 }
 catch( const IO_ERROR& e )
 {
 wxLogWarning( e.Problem() );
 }
 
 std::copy( aliases.begin(), aliases.end(), std::back_inserter( ret ) );
 }
 
 return ret;
}
 
 
LIB_SYMBOL* SYMBOL_LIBRARY_MANAGER::GetBufferedSymbol( const wxString& aAlias,
 const wxString& aLibrary )
{
 wxCHECK( LibraryExists( aLibrary ), nullptr );
 
 // try the library buffers first
 LIB_BUFFER& libBuf = getLibraryBuffer( aLibrary );
 LIB_SYMBOL* bufferedSymbol = libBuf.GetSymbol( aAlias );
 
 if( !bufferedSymbol ) // no buffer symbol found
 {
 // create a copy of the symbol
 try
 {
 LIB_SYMBOL* symbol = symTable()->LoadSymbol( aLibrary, aAlias );
 
 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->IsAlias() )
 {
 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 )
 {
 auto newParent = std::make_unique<LIB_SYMBOL>( *parent.get() );
 bufferedParent = newParent.get();
 libBuf.CreateBuffer( std::move( newParent ), std::make_unique<SCH_SCREEN>() );
 }
 }
 
 auto 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'." ), aAlias, aLibrary );
 DisplayErrorMessage( &m_frame, msg, e.What() );
 bufferedSymbol = nullptr;
 }
 }
 
 return bufferedSymbol;
}
 
 
SCH_SCREEN* SYMBOL_LIBRARY_MANAGER::GetScreen( const wxString& aAlias, const wxString& aLibrary )
{
 wxCHECK( LibraryExists( aLibrary ), nullptr );
 wxCHECK( !aAlias.IsEmpty(), nullptr );
 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( aAlias );
 
 return symbolBuf ? symbolBuf->GetScreen() : nullptr;
}
 
 
bool SYMBOL_LIBRARY_MANAGER::UpdateSymbol( LIB_SYMBOL* aSymbol, const wxString& aLibrary )
{
 wxCHECK( LibraryExists( aLibrary ), false );
 wxCHECK( aSymbol, false );
 
 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
 {
 auto symbolCopy = std::make_unique<LIB_SYMBOL>( *aSymbol, nullptr );
 
 symbolCopy->SetLibId( LIB_ID( aLibrary, aSymbol->GetLibId().GetLibItemName() ) );
 
 auto newScreen = std::make_unique<SCH_SCREEN>();
 SCH_SCREEN& screen = *newScreen;
 libBuf.CreateBuffer( std::move( symbolCopy ), std::move( newScreen ) );
 screen.SetContentModified();
 }
 
 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 wxString& aAlias, const wxString& aLibrary )
{
 auto it = m_libs.find( aLibrary );
 
 if( it == m_libs.end() ) // no items to flush
 return LIB_ID( aLibrary, aAlias );
 
 std::shared_ptr<SYMBOL_BUFFER> symbolBuf = it->second.GetBuffer( aAlias );
 wxCHECK( symbolBuf, LIB_ID( aLibrary, aAlias ) );
 LIB_SYMBOL original( symbolBuf->GetOriginal() );
 
 if( original.GetName() != aAlias )
 {
 UpdateSymbolAfterRename( &original, aAlias, aLibrary );
 }
 else
 {
 // copy the initial data to the current symbol to restore
 symbolBuf->GetSymbol() = original;
 OnDataChanged();
 }
 
 return LIB_ID( aLibrary, 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( const auto& lib : m_libs )
 {
 if( !lib.second.IsModified() )
 continue;
 
 for( const std::shared_ptr<SYMBOL_BUFFER>& buffer : lib.second.GetBuffers() )
 {
 if( !buffer->IsModified() )
 continue;
 
 RevertSymbol( lib.first, buffer->GetOriginal().GetName() );
 }
 }
 
 return retv;
}
 
 
bool SYMBOL_LIBRARY_MANAGER::RemoveSymbol( const wxString& aAlias, const wxString& aLibrary )
{
 LIB_BUFFER& libBuf = getLibraryBuffer( aLibrary );
 std::shared_ptr<SYMBOL_BUFFER> symbolBuf = libBuf.GetBuffer( aAlias );
 wxCHECK( symbolBuf, false );
 
 bool retv = true;
 
 retv &= libBuf.DeleteBuffer( *symbolBuf );
 OnDataChanged();
 
 return retv;
}
 
 
LIB_SYMBOL* SYMBOL_LIBRARY_MANAGER::GetAlias( const wxString& aAlias,
 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( aAlias );
 
 if( symbol )
 return symbol;
 }
 
 // Get the original symbol
 LIB_SYMBOL* alias = nullptr;
 
 try
 {
 alias = symTable()->LoadSymbol( aLibrary, aAlias );
 }
 catch( const IO_ERROR& e )
 {
 wxString msg;
 
 msg.Printf( _( "Cannot load symbol '%s' from library '%s'." ), aAlias, aLibrary );
 DisplayErrorMessage( &m_frame, msg, e.What() );
 }
 
 return alias;
}
 
 
bool SYMBOL_LIBRARY_MANAGER::SymbolExists( const wxString& aAlias, const wxString& aLibrary ) const
{
 auto libBufIt = m_libs.find( aLibrary );
 LIB_SYMBOL* alias = nullptr;
 
 if( libBufIt != m_libs.end() )
 return !!libBufIt->second.GetBuffer( aAlias );
 
 try
 {
 alias = symTable()->LoadSymbol( aLibrary, aAlias );
 }
 catch( IO_ERROR& )
 {
 // checking if certain symbol exists, so its absence is perfectly fine
 }
 
 return alias != nullptr;
}
 
 
bool SYMBOL_LIBRARY_MANAGER::LibraryExists( const wxString& aLibrary, bool aCheckEnabled ) const
{
 if( aLibrary.IsEmpty() )
 return false;
 
 if( m_libs.count( aLibrary ) > 0 )
 return true;
 
 return symTable()->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 );
}
 
 
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
{
 return symTable()->GetLogicalLibs().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,
 SYMBOL_LIB_TABLE& aTable )
{
 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 );
 
 if( schFileType == SCH_IO_MGR::SCH_FILE_UNKNOWN )
 schFileType = SCH_IO_MGR::SCH_LEGACY;
 
 wxString typeName = SCH_IO_MGR::ShowType( schFileType );
 SYMBOL_LIB_TABLE_ROW* libRow = new SYMBOL_LIB_TABLE_ROW( libName, relPath, typeName );
 aTable.InsertRow( libRow );
 
 if( aCreate )
 {
 wxCHECK( schFileType != SCH_IO_MGR::SCH_FILE_T::SCH_LEGACY, false );
 
 try
 {
 aTable.CreateSymbolLib( libName );
 }
 catch( const IO_ERROR& )
 {
 aTable.RemoveRow( libRow );
 return false;
 }
 }
 
 OnDataChanged();
 
 return true;
}
 
 
SYMBOL_LIB_TABLE* SYMBOL_LIBRARY_MANAGER::symTable() const
{
 return PROJECT_SCH::SchSymbolLibTable( &m_frame.Prj() );
}
 
 
std::set<LIB_SYMBOL*> SYMBOL_LIBRARY_MANAGER::getOriginalSymbols( const wxString& aLibrary )
{
 std::set<LIB_SYMBOL*> symbols;
 wxCHECK( LibraryExists( aLibrary ), symbols );
 
 try
 {
 wxArrayString aliases;
 symTable()->EnumerateSymbolLib( aLibrary, aliases );
 
 for( const auto& aliasName : aliases )
 {
 LIB_SYMBOL* alias = symTable()->LoadSymbol( aLibrary, aliasName );
 symbols.insert( alias );
 }
 }
 catch( const IO_ERROR& e )
 {
 wxString msg;
 
 msg.Printf( _( "Cannot enumerate library '%s'." ), aLibrary );
 DisplayErrorMessage( &m_frame, msg, e.What() );
 }
 
 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->IsAlias() )
 {
 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 )
 {
 auto newParent = std::make_unique<LIB_SYMBOL>( *oldParent.get() );
 libParent = newParent.get();
 buf.CreateBuffer( std::move( newParent ), std::make_unique<SCH_SCREEN>() );
 }
 
 auto 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( const IO_ERROR& 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
{
 auto buf = GetBuffer( aAlias );
 
 if( !buf )
 return nullptr;
 
 LIB_SYMBOL& symbol = buf->GetSymbol();
 return &symbol;
}
 
 
bool LIB_BUFFER::CreateBuffer( std::unique_ptr<LIB_SYMBOL> aCopy,
 std::unique_ptr<SCH_SCREEN> aScreen )
{
 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 );
 
 auto symbolBuf = std::make_shared<SYMBOL_BUFFER>( std::move( aCopy ), std::move( aScreen ) );
 m_symbols.push_back( symbolBuf );
 
 ++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;
 };
 
 auto symbolBufIt = std::find_if( m_symbols.begin(), m_symbols.end(), sameBufferPredicate );
 wxCHECK( symbolBufIt != m_symbols.end(), false );
 
 bool retv = true;
 
 // Remove all derived symbols to prevent broken inheritance.
 if( HasDerivedSymbols( aSymbolBuf.GetSymbol().GetName() )
 && ( removeChildSymbols( aSymbolBuf ) == 0 ) )
 {
 retv = false;
 }
 
 m_deleted.emplace_back( *symbolBufIt );
 m_symbols.erase( symbolBufIt );
 ++m_hash;
 
 return retv;
}
 
 
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();
 
 {
 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;
 }
 }
 }
 
 LIB_SYMBOL* parentSymbol = nullptr;
 
 if( libSymbol.IsAlias() )
 {
 LIB_SYMBOL* newCachedSymbol = new LIB_SYMBOL( libSymbol );
 std::shared_ptr<LIB_SYMBOL> bufferedParent = libSymbol.GetParent().lock();
 parentSymbol = newCachedSymbol;
 
 wxCHECK( bufferedParent, false );
 
 LIB_SYMBOL* cachedParent = nullptr;
 
 try
 {
 cachedParent = aPlugin->LoadSymbol( aFileName, bufferedParent->GetName() );
 }
 catch( const IO_ERROR& )
 {
 return false;
 }
 
 if( !cachedParent )
 {
 cachedParent = new LIB_SYMBOL( *bufferedParent.get() );
 newCachedSymbol->SetParent( cachedParent );
 
 try
 {
 aPlugin->SaveSymbol( aFileName, cachedParent, aBuffer ? &properties : nullptr );
 }
 catch( const IO_ERROR& ioe )
 {
 wxLogError( errorMsg, UnescapeString( cachedParent->GetName() ), aFileName,
 ioe.What() );
 return false;
 }
 
 try
 {
 aPlugin->SaveSymbol( aFileName, newCachedSymbol, aBuffer ? &properties : nullptr );
 }
 catch( const IO_ERROR& ioe )
 {
 wxLogError( errorMsg, UnescapeString( newCachedSymbol->GetName() ), aFileName,
 ioe.What() );
 return false;
 }
 
 auto originalParent = std::make_unique<LIB_SYMBOL>( *bufferedParent.get() );
 LIB_SYMBOL& parentRef = *originalParent;
 aSymbolBuf.SetOriginal( std::move( originalParent ) );
 
 auto newSymbol = std::make_unique<LIB_SYMBOL>( libSymbol );
 newSymbol->SetParent( &parentRef );
 aSymbolBuf.SetOriginal( std::move( newSymbol ) );
 }
 else
 {
 newCachedSymbol->SetParent( cachedParent );
 
 try
 {
 aPlugin->SaveSymbol( aFileName, newCachedSymbol, aBuffer ? &properties : nullptr );
 }
 catch( const IO_ERROR& ioe )
 {
 wxLogError( errorMsg, UnescapeString( newCachedSymbol->GetName() ), aFileName,
 ioe.What() );
 return false;
 }
 
 auto originalBufferedParent = GetBuffer( bufferedParent->GetName() );
 wxCHECK( originalBufferedParent, false );
 
 auto newSymbol = std::make_unique<LIB_SYMBOL>( libSymbol );
 newSymbol->SetParent( &originalBufferedParent->GetSymbol() );
 aSymbolBuf.SetOriginal( std::move( newSymbol ) );
 }
 }
 else
 {
 parentSymbol = new LIB_SYMBOL( libSymbol );
 
 try
 {
 aPlugin->SaveSymbol( aFileName, parentSymbol, 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 ) );
 }
 
 wxArrayString derivedSymbols;
 
 // Reparent all symbols derived from the saved symbol.
 if( GetDerivedSymbolNames( libSymbol.GetName(), derivedSymbols ) != 0 )
 {
 // Save the derived symbols.
 for( const wxString& entry : derivedSymbols )
 {
 std::shared_ptr<SYMBOL_BUFFER> symbol = GetBuffer( entry );
 
 wxCHECK2( symbol, continue );
 
 LIB_SYMBOL* derivedSymbol = new LIB_SYMBOL( symbol->GetSymbol() );
 derivedSymbol->SetParent( parentSymbol );
 
 try
 {
 aPlugin->SaveSymbol( aFileName, new LIB_SYMBOL( *derivedSymbol ),
 aBuffer ? &properties : nullptr );
 }
 catch( const IO_ERROR& ioe )
 {
 wxLogError( errorMsg, UnescapeString( derivedSymbol->GetName() ), aFileName,
 ioe.What() );
 return false;
 }
 }
 }
 
 ++m_hash;
 return true;
}
 
 
std::shared_ptr<SYMBOL_BUFFER> LIB_BUFFER::GetBuffer( const wxString& aAlias ) const
{
 for( std::shared_ptr<SYMBOL_BUFFER> entry : m_symbols )
 {
 if( entry->GetSymbol().GetName() == aAlias )
 return entry;
 }
 
 return std::shared_ptr<SYMBOL_BUFFER>( nullptr );
}
 
 
bool LIB_BUFFER::HasDerivedSymbols( const wxString& aParentName ) const
{
 for( const std::shared_ptr<SYMBOL_BUFFER>& entry : m_symbols )
 {
 if( entry->GetSymbol().IsAlias() )
 {
 LIB_SYMBOL_SPTR parent = entry->GetSymbol().GetParent().lock();
 
 // Check for inherited symbol without a valid parent.
 wxCHECK( parent, false );
 
 if( parent->GetName() == 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.IsAlias() && ( 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 )
{
 wxCHECK( !aSymbolName.IsEmpty(), 0 );
 
 for( std::shared_ptr<SYMBOL_BUFFER>& entry : m_symbols )
 {
 const LIB_SYMBOL& symbol = entry->GetSymbol();
 if( symbol.IsAlias() )
 {
 LIB_SYMBOL_SPTR parent = symbol.GetParent().lock();
 
 // Check for inherited symbol without a valid parent.
 wxCHECK2( parent, continue );
 
 if( parent->GetName() == aSymbolName )
 {
 aList.Add( symbol.GetName() );
 
 GetDerivedSymbolNames( symbol.GetName(), aList );
 }
 }
 }
 
 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;
}