netlist_exporter_spice.cpp

Go to the documentation of this file.

/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 1992-2013 jp.charras at wanadoo.fr
 * Copyright (C) 2013 SoftPLC Corporation, Dick Hollenbeck <[email protected]>
 * Copyright (C) 1992-2023 KiCad Developers, see AUTHORS.TXT for contributors.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
#include <sim/kibis/kibis.h>
#include <netlist_exporter_spice.h>
#include <sim/ngspice_circuit_model.h>
#include <sim/sim_library_spice.h>
#include <sim/sim_model_raw_spice.h>
#include <sim/sim_model_ideal.h>
#include <sim/spice_grammar.h>
#include <common.h>
#include <confirm.h>
#include <pgm_base.h>
#include <env_paths.h>
#include <sim/sim_library.h>
#include <sim/sim_library_kibis.h>
#include <sim/sim_model_kibis.h>
#include <sim/sim_model.h>
#include <sch_screen.h>
#include <sch_text.h>
#include <sch_textbox.h>
#include <string_utils.h>
 
#include <dialogs/html_message_box.h>
#include <fmt/core.h>
#include <paths.h>
#include <wx/dir.h>
#include <locale_io.h>
#include "markup_parser.h"
 
#if 0
 
#include <pegtl.hpp>
#include <pegtl/contrib/parse_tree.hpp>
 
namespace NETLIST_EXPORTER_SPICE_PARSER
{
 using namespace SPICE_GRAMMAR;
 
 struct textGrammar : must<spiceSource> {};
 
 template <typename Rule> struct textSelector : std::false_type {};
 template <> struct textSelector<modelUnit> : std::true_type {};
 
 template <> struct textSelector<dotControl> : std::true_type {};
 
 template <> struct textSelector<dotTitle> : std::true_type {};
 template <> struct textSelector<dotTitleTitle> : std::true_type {};
 
 template <> struct textSelector<dotInclude> : std::true_type {};
 template <> struct textSelector<dotIncludePathWithoutQuotes> : std::true_type {};
 template <> struct textSelector<dotIncludePathWithoutApostrophes> : std::true_type {};
 template <> struct textSelector<dotIncludePath> : std::true_type {};
 
 template <> struct textSelector<kLine> : std::true_type {};
 
 template <> struct textSelector<dotLine> : std::true_type {};
}
#endif
 
 
std::string NAME_GENERATOR::Generate( const std::string& aProposedName )
{
 if( !m_names.count( aProposedName ) )
 return aProposedName;
 
 for( uint64_t i = 1; i < UINT64_MAX; ++i )
 {
 std::string name = fmt::format( "{}#{}", aProposedName, i );
 
 if( !m_names.count( name ) )
 return name;
 }
 
 // Should never happen.
 THROW_IO_ERROR( wxString::Format( _( "Failed to generate a name for '%s': exceeded UINT64_MAX" ),
 aProposedName ) );
}
 
 
NETLIST_EXPORTER_SPICE::NETLIST_EXPORTER_SPICE( SCHEMATIC_IFACE* aSchematic,
 wxWindow* aDialogParent ) :
 NETLIST_EXPORTER_BASE( aSchematic ),
 m_libMgr( &aSchematic->Prj() ),
 m_dialogParent( aDialogParent )
{
}
 
 
bool NETLIST_EXPORTER_SPICE::WriteNetlist( const wxString& aOutFileName, unsigned aNetlistOptions,
 REPORTER& aReporter )
{
 m_libMgr.SetReporter( &aReporter );
 FILE_OUTPUTFORMATTER formatter( aOutFileName, wxT( "wt" ), '\'' );
 return DoWriteNetlist( formatter, aNetlistOptions, aReporter );
}
 
 
bool NETLIST_EXPORTER_SPICE::DoWriteNetlist( OUTPUTFORMATTER& aFormatter, unsigned aNetlistOptions,
 REPORTER& aReporter )
{
 LOCALE_IO dummy;
 
 // Cleanup list to avoid duplicate if the netlist exporter is run more than once.
 m_rawIncludes.clear();
 
 if( !ReadSchematicAndLibraries( aNetlistOptions, aReporter ) )
 return false;
 
 WriteHead( aFormatter, aNetlistOptions );
 
 writeIncludes( aFormatter, aNetlistOptions );
 writeModels( aFormatter );
 
 // Skip this if there is no netlist to avoid an ngspice segfault
 if( !m_items.empty() )
 WriteDirectives( aFormatter, aNetlistOptions );
 
 writeItems( aFormatter );
 
 WriteTail( aFormatter, aNetlistOptions );
 
 return true;
}
 
 
void NETLIST_EXPORTER_SPICE::WriteHead( OUTPUTFORMATTER& aFormatter, unsigned aNetlistOptions )
{
 aFormatter.Print( 0, "KiCad schematic\n" );
}
 
 
void NETLIST_EXPORTER_SPICE::WriteTail( OUTPUTFORMATTER& aFormatter, unsigned aNetlistOptions )
{
 aFormatter.Print( 0, ".end\n" );
}
 
 
bool NETLIST_EXPORTER_SPICE::ReadSchematicAndLibraries( unsigned aNetlistOptions,
 REPORTER& aReporter )
{
 wxString msg;
 std::set<std::string> refNames; // Set of reference names to check for duplication.
 int ncCounter = 1;
 
 ReadDirectives( aNetlistOptions );
 
 m_nets.clear();
 m_items.clear();
 m_referencesAlreadyFound.Clear();
 m_libParts.clear();
 
 wxFileName cacheDir;
 cacheDir.AssignDir( PATHS::GetUserCachePath() );
 cacheDir.AppendDir( wxT( "ibis" ) );
 
 if( !cacheDir.DirExists() )
 {
 cacheDir.Mkdir( wxS_DIR_DEFAULT, wxPATH_MKDIR_FULL );
 
 if( !cacheDir.DirExists() )
 {
 wxLogTrace( wxT( "IBIS_CACHE:" ),
 wxT( "%s:%s:%d\n * failed to create ibis cache directory '%s'" ),
 __FILE__, __FUNCTION__, __LINE__, cacheDir.GetPath() );
 
 return false;
 }
 }
 
 wxDir dir;
 wxString dirName = cacheDir.GetFullPath();
 
 if( !dir.Open( dirName ) )
 return false;
 
 wxFileName thisFile;
 wxArrayString fileList;
 wxString fileSpec = wxT( "*.cache" );
 
 thisFile.SetPath( dirName ); // Set the base path to the cache folder
 
 size_t numFilesFound = wxDir::GetAllFiles( dirName, &fileList, fileSpec );
 
 for( size_t ii = 0; ii < numFilesFound; ii++ )
 {
 // Completes path to specific file so we can get its "last access" date
 thisFile.SetFullName( fileList[ii] );
 wxRemoveFile( thisFile.GetFullPath() );
 }
 
 for( SCH_SHEET_PATH& sheet : GetSheets( aNetlistOptions ) )
 {
 for( SCH_ITEM* item : sheet.LastScreen()->Items().OfType( SCH_SYMBOL_T ) )
 {
 SCH_SYMBOL* symbol = findNextSymbol( item, &sheet );
 
 if( !symbol || symbol->GetFieldText( SIM_ENABLE_FIELD ) == wxT( "0" ) )
 continue;
 
 std::vector<PIN_INFO> pins = CreatePinList( symbol, &sheet, true );
 
 SPICE_ITEM spiceItem;
 
 for( int i = 0; i < symbol->GetFieldCount(); ++i )
 {
 spiceItem.fields.emplace_back( VECTOR2I(), i, symbol,
 symbol->GetFields()[ i ].GetName() );
 
 if( i == REFERENCE_FIELD )
 spiceItem.fields.back().SetText( symbol->GetRef( &sheet ) );
 else
 spiceItem.fields.back().SetText( symbol->GetFields()[i].GetShownText( 0, false ) );
 }
 
 wxString deviceType;
 wxString modelType;
 wxString modelParams;
 wxString pinMap;
 
 try
 {
 readRefName( sheet, *symbol, spiceItem, refNames );
 readModel( sheet, *symbol, spiceItem );
 readPinNumbers( *symbol, spiceItem, pins );
 readPinNetNames( *symbol, spiceItem, pins, ncCounter );
 
 // TODO: transmission line handling?
 
 m_items.push_back( std::move( spiceItem ) );
 }
 catch( const IO_ERROR& e )
 {
 msg.Printf( _( "Error reading simulation model from symbol '%s':\n%s" ),
 symbol->GetRef( &sheet ),
 e.Problem() );
 aReporter.Report( msg, RPT_SEVERITY_ERROR );
 }
 }
 }
 
 return !aReporter.HasMessage();
}
 
 
void NETLIST_EXPORTER_SPICE::ConvertToSpiceMarkup( std::string& aNetName )
{
 MARKUP::MARKUP_PARSER markupParser( aNetName );
 std::unique_ptr<MARKUP::NODE> root = markupParser.Parse();
 std::string converted;
 
 std::function<void( const std::unique_ptr<MARKUP::NODE>&)> convertMarkup =
 [&]( const std::unique_ptr<MARKUP::NODE>& aNode )
 {
 if( aNode )
 {
 if( !aNode->is_root() )
 {
 if( aNode->isOverbar() )
 {
 // ~{CLK} is a different signal than CLK
 converted += '~';
 }
 else if( aNode->isSubscript() || aNode->isSuperscript() )
 {
 // V_{OUT} is just a pretty-printed version of VOUT
 }
 
 if( aNode->has_content() )
 converted += aNode->string();
 }
 
 for( const std::unique_ptr<MARKUP::NODE>& child : aNode->children )
 convertMarkup( child );
 }
 };
 
 convertMarkup( root );
 
 // Remove ngspice-disallowed chars
 std::replace( converted.begin(), converted.end(), '%', '_' );
 std::replace( converted.begin(), converted.end(), '(', '_' );
 std::replace( converted.begin(), converted.end(), ')', '_' );
 std::replace( converted.begin(), converted.end(), ',', '_' );
 std::replace( converted.begin(), converted.end(), '[', '_' );
 std::replace( converted.begin(), converted.end(), ']', '_' );
 std::replace( converted.begin(), converted.end(), '<', '_' );
 std::replace( converted.begin(), converted.end(), '>', '_' );
 std::replace( converted.begin(), converted.end(), '~', '_' );
 
 aNetName = converted;
}
 
 
std::string NETLIST_EXPORTER_SPICE::GetItemName( const std::string& aRefName ) const
{
 const SPICE_ITEM* item = FindItem( aRefName );
 
 if( !item )
 return "";
 
 return item->model->SpiceGenerator().ItemName( *item );
}
 
 
const SPICE_ITEM* NETLIST_EXPORTER_SPICE::FindItem( const std::string& aRefName ) const
{
 const std::list<SPICE_ITEM>& spiceItems = GetItems();
 
 auto it = std::find_if( spiceItems.begin(), spiceItems.end(),
 [aRefName]( const SPICE_ITEM& item )
 {
 return item.refName == aRefName;
 } );
 
 if( it != spiceItems.end() )
 return &*it;
 
 return nullptr;
}
 
 
void NETLIST_EXPORTER_SPICE::ReadDirectives( unsigned aNetlistOptions )
{
 wxString msg;
 wxString text;
 
 m_directives.clear();
 
 for( const SCH_SHEET_PATH& sheet : GetSheets( aNetlistOptions ) )
 {
 for( SCH_ITEM* item : sheet.LastScreen()->Items() )
 {
 if( item->Type() == SCH_TEXT_T )
 text = static_cast<SCH_TEXT*>( item )->GetShownText();
 else if( item->Type() == SCH_TEXTBOX_T )
 text = static_cast<SCH_TEXTBOX*>( item )->GetShownText();
 else
 continue;
 
 // Send anything that contains directives to SPICE
 wxStringTokenizer tokenizer( text, wxT( "\r\n" ), wxTOKEN_STRTOK );
 bool foundDirective = false;
 
 auto isDirective =
 []( const wxString& line, const wxString& dir )
 {
 return line == dir || line.StartsWith( dir + wxS( " " ) );
 };
 
 while( tokenizer.HasMoreTokens() )
 {
 wxString line = tokenizer.GetNextToken().Upper();
 
 if( line.StartsWith( wxT( "." ) ) )
 {
 if( isDirective( line, wxS( ".AC" ) )
 || isDirective( line, wxS( ".CONTROL" ) )
 || isDirective( line, wxS( ".CSPARAM" ) )
 || isDirective( line, wxS( ".DISTO" ) )
 || isDirective( line, wxS( ".ELSE" ) )
 || isDirective( line, wxS( ".ELSEIF" ) )
 || isDirective( line, wxS( ".END" ) )
 || isDirective( line, wxS( ".ENDC" ) )
 || isDirective( line, wxS( ".ENDIF" ) )
 || isDirective( line, wxS( ".ENDS" ) )
 || isDirective( line, wxS( ".FOUR" ) )
 || isDirective( line, wxS( ".FUNC" ) )
 || isDirective( line, wxS( ".GLOBAL" ) )
 || isDirective( line, wxS( ".IC" ) )
 || isDirective( line, wxS( ".IF" ) )
 || isDirective( line, wxS( ".INCLUDE" ) )
 || isDirective( line, wxS( ".LIB" ) )
 || isDirective( line, wxS( ".MEAS" ) )
 || isDirective( line, wxS( ".MODEL" ) )
 || isDirective( line, wxS( ".NODESET" ) )
 || isDirective( line, wxS( ".NOISE" ) )
 || isDirective( line, wxS( ".OP" ) )
 || isDirective( line, wxS( ".OPTIONS" ) )
 || isDirective( line, wxS( ".PARAM" ) )
 || isDirective( line, wxS( ".PLOT" ) )
 || isDirective( line, wxS( ".PRINT" ) )
 || isDirective( line, wxS( ".PROBE" ) )
 || isDirective( line, wxS( ".PZ" ) )
 || isDirective( line, wxS( ".SAVE" ) )
 || isDirective( line, wxS( ".SENS" ) )
 || isDirective( line, wxS( ".SP" ) )
 || isDirective( line, wxS( ".SUBCKT" ) )
 || isDirective( line, wxS( ".TEMP" ) )
 || isDirective( line, wxS( ".TF" ) )
 || isDirective( line, wxS( ".TITLE" ) )
 || isDirective( line, wxS( ".TRAN" ) )
 || isDirective( line, wxS( ".WIDTH" ) ) )
 {
 foundDirective = true;
 break;
 }
 }
 else if( line.StartsWith( wxT( "K" ) ) )
 {
 // Check for mutual inductor declaration
 wxStringTokenizer line_t( line, wxT( " \t" ), wxTOKEN_STRTOK );
 
 // Coupling ID
 if( !line_t.HasMoreTokens() || !line_t.GetNextToken().StartsWith( wxT( "K" ) ) )
 continue;
 
 // Inductor 1 ID
 if( !line_t.HasMoreTokens() || !line_t.GetNextToken().StartsWith( wxT( "L" ) ) )
 continue;
 
 // Inductor 2 ID
 if( !line_t.HasMoreTokens() || !line_t.GetNextToken().StartsWith( wxT( "L" ) ) )
 continue;
 
 // That's probably distinctive enough not to bother trying to parse the
 // coupling value. If there's anything else, assume it's the value.
 if( line_t.HasMoreTokens() )
 {
 foundDirective = true;
 break;
 }
 }
 }
 
 if( foundDirective )
 m_directives.emplace_back( text );
 }
 }
}
 
 
void NETLIST_EXPORTER_SPICE::readRefName( SCH_SHEET_PATH& aSheet, SCH_SYMBOL& aSymbol,
 SPICE_ITEM& aItem, std::set<std::string>& aRefNames )
{
 aItem.refName = aSymbol.GetRef( &aSheet );
 
 if( !aRefNames.insert( aItem.refName ).second )
 wxASSERT( wxT( "Duplicate refdes encountered; what happened to ReadyToNetlist()?" ) );
}
 
 
void NETLIST_EXPORTER_SPICE::readModel( SCH_SHEET_PATH& aSheet, SCH_SYMBOL& aSymbol,
 SPICE_ITEM& aItem )
{
 SIM_LIBRARY::MODEL libModel = m_libMgr.CreateModel( &aSheet, aSymbol );
 
 aItem.baseModelName = libModel.name;
 aItem.model = &libModel.model;
 
 std::string modelName = aItem.model->SpiceGenerator().ModelName( aItem );
 // Resolve model name collisions.
 aItem.modelName = m_modelNameGenerator.Generate( modelName );
 
 // FIXME: Don't have special cases for raw Spice models and KIBIS.
 if( auto rawSpiceModel = dynamic_cast<const SIM_MODEL_RAW_SPICE*>( aItem.model ) )
 {
 int libParamIndex = static_cast<int>( SIM_MODEL_RAW_SPICE::SPICE_PARAM::LIB );
 wxString path = rawSpiceModel->GetParam( libParamIndex ).value;
 
 if( !path.IsEmpty() )
 m_rawIncludes.insert( path );
 }
 else if( auto kibisModel = dynamic_cast<const SIM_MODEL_KIBIS*>( aItem.model ) )
 {
 wxFileName cacheFn;
 cacheFn.AssignDir( PATHS::GetUserCachePath() );
 cacheFn.AppendDir( wxT( "ibis" ) );
 cacheFn.SetFullName( aSymbol.GetRef( &aSheet ) + wxT( ".cache" ) );
 
 wxFile cacheFile( cacheFn.GetFullPath(), wxFile::write );
 
 if( !cacheFile.IsOpened() )
 {
 DisplayErrorMessage( m_dialogParent,
 wxString::Format( _( "Could not open file '%s' to write "
 "IBIS model" ),
 cacheFn.GetFullPath() ) );
 }
 
 auto spiceGenerator = static_cast<const SPICE_GENERATOR_KIBIS&>( kibisModel->SpiceGenerator() );
 std::string modelData = spiceGenerator.IbisDevice( aItem, m_schematic->Prj(),
 cacheFn.GetPath( wxPATH_GET_SEPARATOR ) );
 
 cacheFile.Write( wxString( modelData ) );
 m_rawIncludes.insert( cacheFn.GetFullPath() );
 }
}
 
 
void NETLIST_EXPORTER_SPICE::readPinNumbers( SCH_SYMBOL& aSymbol, SPICE_ITEM& aItem,
 const std::vector<PIN_INFO>& aPins )
{
 for( const PIN_INFO& pin : aPins )
 aItem.pinNumbers.emplace_back( pin.num.ToStdString() );
}
 
 
void NETLIST_EXPORTER_SPICE::readPinNetNames( SCH_SYMBOL& aSymbol, SPICE_ITEM& aItem,
 const std::vector<PIN_INFO>& aPins, int& aNcCounter )
{
 for( const PIN_INFO& pinInfo : aPins )
 {
 std::string netName = GenerateItemPinNetName( pinInfo.netName.ToStdString(), aNcCounter );
 
 aItem.pinNetNames.push_back( netName );
 m_nets.insert( netName );
 }
}
 
 
void NETLIST_EXPORTER_SPICE::writeInclude( OUTPUTFORMATTER& aFormatter, unsigned aNetlistOptions,
 const wxString& aPath )
{
 // First, expand env vars, if any.
 wxString expandedPath = ExpandEnvVarSubstitutions( aPath, &m_schematic->Prj() );
 
 // Path may have been authored by someone on a Windows box; convert it to UNIX format
 expandedPath.Replace( '\\', '/' );
 
 wxString fullPath;
 
 if( aNetlistOptions & OPTION_ADJUST_INCLUDE_PATHS )
 {
 // Look for the library in known search locations.
 fullPath = ResolveFile( expandedPath, &Pgm().GetLocalEnvVariables(), &m_schematic->Prj() );
 
 if( fullPath.IsEmpty() )
 {
 DisplayErrorMessage( m_dialogParent,
 wxString::Format( _( "Could not find library file '%s'" ),
 expandedPath ) );
 fullPath = expandedPath;
 }
 else if( wxFileName::GetPathSeparator() == '\\' )
 {
 // Convert it to UNIX format (again) if ResolveFile() returned a Windows style path
 fullPath.Replace( '\\', '/' );
 }
 }
 else
 {
 fullPath = expandedPath;
 }
 
 aFormatter.Print( 0, ".include \"%s\"\n", TO_UTF8( fullPath ) );
}
 
 
void NETLIST_EXPORTER_SPICE::writeIncludes( OUTPUTFORMATTER& aFormatter, unsigned aNetlistOptions )
{
 for( const auto& [path, library] : m_libMgr.GetLibraries() )
 {
 if( dynamic_cast<const SIM_LIBRARY_SPICE*>( &library.get() ) )
 writeInclude( aFormatter, aNetlistOptions, path );
 }
 
 for( const wxString& path : m_rawIncludes )
 writeInclude( aFormatter, aNetlistOptions, path );
}
 
 
void NETLIST_EXPORTER_SPICE::writeModels( OUTPUTFORMATTER& aFormatter )
{
 for( const SPICE_ITEM& item : m_items )
 {
 if( !item.model->IsEnabled() )
 continue;
 
 aFormatter.Print( 0, "%s", item.model->SpiceGenerator().ModelLine( item ).c_str() );
 }
}
 
 
void NETLIST_EXPORTER_SPICE::writeItems( OUTPUTFORMATTER& aFormatter )
{
 for( const SPICE_ITEM& item : m_items )
 {
 if( !item.model->IsEnabled() )
 continue;
 
 aFormatter.Print( 0, "%s", item.model->SpiceGenerator().ItemLine( item ).c_str() );
 }
}
 
 
void NETLIST_EXPORTER_SPICE::WriteDirectives( OUTPUTFORMATTER& aFormatter,
 unsigned aNetlistOptions ) const
{
 if( aNetlistOptions & OPTION_SAVE_ALL_VOLTAGES )
 aFormatter.Print( 0, ".save all\n" );
 
 if( aNetlistOptions & OPTION_SAVE_ALL_CURRENTS )
 aFormatter.Print( 0, ".probe alli\n" );
 
 if( aNetlistOptions & OPTION_SAVE_ALL_DISSIPATIONS )
 {
 for( const SPICE_ITEM& item : m_items )
 {
 // ngspice (v39) does not support power measurement for XSPICE devices
 // XPSICE devices are marked with 'A'
  std::string itemName = item.model->SpiceGenerator().ItemName( item );
 
 if( ( item.model->GetPinCount() >= 2 ) && ( itemName.size() > 0 )
 && ( itemName.c_str()[0] != 'A' ) )
 {
 aFormatter.Print( 0, ".probe p(%s)\n", itemName.c_str() );
 }
 }
 }
 
 auto isSimCommand =
 []( const wxString& candidate, const wxString& dir )
 {
 return candidate == dir || candidate.StartsWith( dir + wxS( " " ) );
 };
 
 for( const wxString& directive : m_directives )
 {
 bool simCommand = false;
 
 if( directive.StartsWith( "." ) )
 {
 wxString candidate = directive.Upper();
 
 simCommand = ( isSimCommand( candidate, wxS( ".AC" ) )
 || isSimCommand( candidate, wxS( ".DC" ) )
 || isSimCommand( candidate, wxS( ".TRAN" ) )
 || isSimCommand( candidate, wxS( ".OP" ) )
 || isSimCommand( candidate, wxS( ".DISTO" ) )
 || isSimCommand( candidate, wxS( ".NOISE" ) )
 || isSimCommand( candidate, wxS( ".PZ" ) )
 || isSimCommand( candidate, wxS( ".SENS" ) )
 || isSimCommand( candidate, wxS( ".TF" ) ) );
 }
 
 if( !simCommand || ( aNetlistOptions & OPTION_SIM_COMMAND ) )
 aFormatter.Print( 0, "%s\n", UTF8( directive ).c_str() );
 }
}
 
 
std::string NETLIST_EXPORTER_SPICE::GenerateItemPinNetName( const std::string& aNetName,
 int& aNcCounter ) const
{
 std::string netName = aNetName;
 
 ConvertToSpiceMarkup( netName );
 netName = std::string( UnescapeString( netName ).ToUTF8() );
 
 if( netName == "" )
 netName = fmt::format( "NC-{}", aNcCounter++ );
 
 return netName;
}
 
 
SCH_SHEET_LIST NETLIST_EXPORTER_SPICE::GetSheets( unsigned aNetlistOptions ) const
{
 if( aNetlistOptions & OPTION_CUR_SHEET_AS_ROOT )
 return SCH_SHEET_LIST( m_schematic->CurrentSheet().Last() );
 else
 return m_schematic->GetSheets();
}