sch_sexpr_plugin.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2020 CERN
 * Copyright (C) 2021 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * @author Wayne Stambaugh <[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 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#include <algorithm>

// For some reason wxWidgets is built with wxUSE_BASE64 unset so expose the wxWidgets
// base64 code.
#define wxUSE_BASE64 1
#include <wx/base64.h>
#include <wx/log.h>
#include <wx/mstream.h>
#include <advanced_config.h>
#include <trace_helpers.h>
#include <locale_io.h>
#include <sch_bitmap.h>
#include <sch_bus_entry.h>
#include <sch_symbol.h>
#include <sch_edit_frame.h> // SYMBOL_ORIENTATION_T
#include <sch_junction.h>
#include <sch_line.h>
#include <sch_no_connect.h>
#include <sch_text.h>
#include <sch_sheet.h>
#include <sch_sheet_pin.h>
#include <schematic.h>
#include <sch_plugins/kicad/sch_sexpr_plugin.h>
#include <sch_screen.h>
#include <symbol_library.h>
#include <lib_shape.h>
#include <lib_field.h>
#include <lib_pin.h>
#include <lib_text.h>
#include <eeschema_id.h> // for MAX_UNIT_COUNT_PER_PACKAGE definition
#include <sch_file_versions.h>
#include <schematic_lexer.h>
#include <sch_plugins/kicad/sch_sexpr_parser.h>
#include <symbol_lib_table.h> // for PropPowerSymsOnly definition.
#include <ee_selection.h>
#include <string_utils.h>
#include <wx_filename.h> // for ::ResolvePossibleSymlinks()
#include <progress_reporter.h>


using namespace TSCHEMATIC_T;


#define SCH_PARSE_ERROR( text, reader, pos ) \
 THROW_PARSE_ERROR( text, reader.GetSource(), reader.Line(), \
 reader.LineNumber(), pos - reader.Line() )


static const char* emptyString = "";

static void formatFill( OUTPUTFORMATTER* aFormatter, int aNestLevel, FILL_T aFillMode,
 const COLOR4D& aFillColor )
{
 const char* fillType;

 switch( aFillMode )
 {
 default:
 case FILL_T::NO_FILL: fillType = "none"; break;
 case FILL_T::FILLED_SHAPE: fillType = "outline"; break;
 case FILL_T::FILLED_WITH_BG_BODYCOLOR: fillType = "background"; break;
 }

 aFormatter->Print( aNestLevel, "(fill (type %s))", fillType );
}


static const char* getPinElectricalTypeToken( ELECTRICAL_PINTYPE aType )
{
 switch( aType )
 {
 case ELECTRICAL_PINTYPE::PT_INPUT:
 return SCHEMATIC_LEXER::TokenName( T_input );

 case ELECTRICAL_PINTYPE::PT_OUTPUT:
 return SCHEMATIC_LEXER::TokenName( T_output );

 case ELECTRICAL_PINTYPE::PT_BIDI:
 return SCHEMATIC_LEXER::TokenName( T_bidirectional );

 case ELECTRICAL_PINTYPE::PT_TRISTATE:
 return SCHEMATIC_LEXER::TokenName( T_tri_state );

 case ELECTRICAL_PINTYPE::PT_PASSIVE:
 return SCHEMATIC_LEXER::TokenName( T_passive );

 case ELECTRICAL_PINTYPE::PT_NIC:
 return SCHEMATIC_LEXER::TokenName( T_free );

 case ELECTRICAL_PINTYPE::PT_UNSPECIFIED:
 return SCHEMATIC_LEXER::TokenName( T_unspecified );

 case ELECTRICAL_PINTYPE::PT_POWER_IN:
 return SCHEMATIC_LEXER::TokenName( T_power_in );

 case ELECTRICAL_PINTYPE::PT_POWER_OUT:
 return SCHEMATIC_LEXER::TokenName( T_power_out );

 case ELECTRICAL_PINTYPE::PT_OPENCOLLECTOR:
 return SCHEMATIC_LEXER::TokenName( T_open_collector );

 case ELECTRICAL_PINTYPE::PT_OPENEMITTER:
 return SCHEMATIC_LEXER::TokenName( T_open_emitter );

 case ELECTRICAL_PINTYPE::PT_NC:
 return SCHEMATIC_LEXER::TokenName( T_no_connect );

 default:
 wxFAIL_MSG( "Missing symbol library pin connection type" );
 }

 return emptyString;
}


static const char* getPinShapeToken( GRAPHIC_PINSHAPE aShape )
{
 switch( aShape )
 {
 case GRAPHIC_PINSHAPE::LINE:
 return SCHEMATIC_LEXER::TokenName( T_line );

 case GRAPHIC_PINSHAPE::INVERTED:
 return SCHEMATIC_LEXER::TokenName( T_inverted );

 case GRAPHIC_PINSHAPE::CLOCK:
 return SCHEMATIC_LEXER::TokenName( T_clock );

 case GRAPHIC_PINSHAPE::INVERTED_CLOCK:
 return SCHEMATIC_LEXER::TokenName( T_inverted_clock );

 case GRAPHIC_PINSHAPE::INPUT_LOW:
 return SCHEMATIC_LEXER::TokenName( T_input_low );

 case GRAPHIC_PINSHAPE::CLOCK_LOW:
 return SCHEMATIC_LEXER::TokenName( T_clock_low );

 case GRAPHIC_PINSHAPE::OUTPUT_LOW:
 return SCHEMATIC_LEXER::TokenName( T_output_low );

 case GRAPHIC_PINSHAPE::FALLING_EDGE_CLOCK:
 return SCHEMATIC_LEXER::TokenName( T_edge_clock_high );

 case GRAPHIC_PINSHAPE::NONLOGIC:
 return SCHEMATIC_LEXER::TokenName( T_non_logic );

 default:
 wxFAIL_MSG( "Missing symbol library pin shape type" );
 }

 return emptyString;
}


static float getPinAngle( int aOrientation )
{
 switch( aOrientation )
 {
 case PIN_RIGHT: return 0.0;
 case PIN_LEFT: return 180.0;
 case PIN_UP: return 90.0;
 case PIN_DOWN: return 270.0;
 default: wxFAIL_MSG( "Missing symbol library pin orientation type" ); return 0.0;
 }
}


static const char* getSheetPinShapeToken( PINSHEETLABEL_SHAPE aShape )
{
 switch( aShape )
 {
 case PINSHEETLABEL_SHAPE::PS_INPUT: return SCHEMATIC_LEXER::TokenName( T_input );
 case PINSHEETLABEL_SHAPE::PS_OUTPUT: return SCHEMATIC_LEXER::TokenName( T_output );
 case PINSHEETLABEL_SHAPE::PS_BIDI: return SCHEMATIC_LEXER::TokenName( T_bidirectional );
 case PINSHEETLABEL_SHAPE::PS_TRISTATE: return SCHEMATIC_LEXER::TokenName( T_tri_state );
 case PINSHEETLABEL_SHAPE::PS_UNSPECIFIED: return SCHEMATIC_LEXER::TokenName( T_passive );
 default: wxFAIL; return SCHEMATIC_LEXER::TokenName( T_passive );
 }
}


static double getSheetPinAngle( SHEET_SIDE aSide )
{
 double retv;

 switch( aSide )
 {
 case SHEET_SIDE::UNDEFINED:
 case SHEET_SIDE::LEFT: retv = 180.0; break;
 case SHEET_SIDE::RIGHT: retv = 0.0; break;
 case SHEET_SIDE::TOP: retv = 90.0; break;
 case SHEET_SIDE::BOTTOM: retv = 270.0; break;
 default: wxFAIL; retv = 0.0; break;
 }

 return retv;
}


static wxString getLineStyleToken( PLOT_DASH_TYPE aStyle )
{
 wxString token;

 switch( aStyle )
 {
 case PLOT_DASH_TYPE::DASH: token = "dash"; break;
 case PLOT_DASH_TYPE::DOT: token = "dot"; break;
 case PLOT_DASH_TYPE::DASHDOT: token = "dash_dot"; break;
 case PLOT_DASH_TYPE::SOLID: token = "solid"; break;
 case PLOT_DASH_TYPE::DEFAULT: token = "default"; break;
 }

 return token;
}


static const char* getTextTypeToken( KICAD_T aType )
{
 switch( aType )
 {
 case SCH_TEXT_T: return SCHEMATIC_LEXER::TokenName( T_text );
 case SCH_LABEL_T: return SCHEMATIC_LEXER::TokenName( T_label );
 case SCH_GLOBAL_LABEL_T: return SCHEMATIC_LEXER::TokenName( T_global_label );
 case SCH_HIER_LABEL_T: return SCHEMATIC_LEXER::TokenName( T_hierarchical_label );
 default: wxFAIL; return SCHEMATIC_LEXER::TokenName( T_text );
 }
}


static void formatStroke( OUTPUTFORMATTER* aFormatter, int aNestLevel,
 const STROKE_PARAMS& aStroke )
{
 wxASSERT( aFormatter != nullptr );

 aFormatter->Print( aNestLevel, "(stroke (width %s) (type %s) (color %d %d %d %s))",
 FormatInternalUnits( aStroke.GetWidth() ).c_str(),
 TO_UTF8( getLineStyleToken( aStroke.GetPlotStyle() ) ),
 KiROUND( aStroke.GetColor().r * 255.0 ),
 KiROUND( aStroke.GetColor().g * 255.0 ),
 KiROUND( aStroke.GetColor().b * 255.0 ),
 Double2Str( aStroke.GetColor().a ).c_str() );
}


static void formatArc( OUTPUTFORMATTER* aFormatter, int aNestLevel, EDA_SHAPE* aArc, int x1, int x2,
 const STROKE_PARAMS& aStroke, FILL_T aFillMode, const COLOR4D& aFillColor,
 KIID aUuid = niluuid )
{
 if( x1 > 1800 )
 x1 -= 3600;

 if( x2 > 1800 )
 x2 -= 3600;

 aFormatter->Print( aNestLevel, "(arc (start %s) (mid %s) (end %s)\n",
 FormatInternalUnits( aArc->GetStart() ).c_str(),
 FormatInternalUnits( aArc->GetArcMid() ).c_str(),
 FormatInternalUnits( aArc->GetEnd() ).c_str() );

 formatStroke( aFormatter, aNestLevel + 1, aStroke );
 aFormatter->Print( 0, "\n" );
 formatFill( aFormatter, aNestLevel + 1, aFillMode, aFillColor );
 aFormatter->Print( 0, "\n" );

 if( aUuid != niluuid )
 aFormatter->Print( aNestLevel + 1, "(uuid %s)\n", TO_UTF8( aUuid.AsString() ) );

 aFormatter->Print( aNestLevel, ")\n" );
}


static void formatCircle( OUTPUTFORMATTER* aFormatter, int aNestLevel, EDA_SHAPE* aCircle,
 const STROKE_PARAMS& aStroke, FILL_T aFillMode, const COLOR4D& aFillColor,
 KIID aUuid = niluuid )
{
 aFormatter->Print( aNestLevel, "(circle (center %s %s) (radius %s)\n",
 FormatInternalUnits( aCircle->GetStart().x ).c_str(),
 FormatInternalUnits( aCircle->GetStart().y ).c_str(),
 FormatInternalUnits( aCircle->GetRadius() ).c_str() );

 formatStroke( aFormatter, aNestLevel + 1, aStroke );
 aFormatter->Print( 0, "\n" );
 formatFill( aFormatter, aNestLevel + 1, aFillMode, aFillColor );
 aFormatter->Print( 0, "\n" );

 if( aUuid != niluuid )
 aFormatter->Print( aNestLevel + 1, "(uuid %s)\n", TO_UTF8( aUuid.AsString() ) );

 aFormatter->Print( aNestLevel, ")\n" );
}


static void formatRect( OUTPUTFORMATTER* aFormatter, int aNestLevel, EDA_SHAPE* aRect,
 const STROKE_PARAMS& aStroke, FILL_T aFillMode, const COLOR4D& aFillColor,
 KIID aUuid = niluuid )
{
 aFormatter->Print( aNestLevel, "(rectangle (start %s %s) (end %s %s)\n",
 FormatInternalUnits( aRect->GetStart().x ).c_str(),
 FormatInternalUnits( aRect->GetStart().y ).c_str(),
 FormatInternalUnits( aRect->GetEnd().x ).c_str(),
 FormatInternalUnits( aRect->GetEnd().y ).c_str() );
 formatStroke( aFormatter, aNestLevel + 1, aStroke );
 aFormatter->Print( 0, "\n" );
 formatFill( aFormatter, aNestLevel + 1, aFillMode, aFillColor );
 aFormatter->Print( 0, "\n" );

 if( aUuid != niluuid )
 aFormatter->Print( aNestLevel + 1, "(uuid %s)\n", TO_UTF8( aUuid.AsString() ) );

 aFormatter->Print( aNestLevel, ")\n" );
}


static void formatBezier( OUTPUTFORMATTER* aFormatter, int aNestLevel, EDA_SHAPE* aBezier,
 const STROKE_PARAMS& aStroke, FILL_T aFillMode, const COLOR4D& aFillColor,
 KIID aUuid = niluuid )
{
 aFormatter->Print( aNestLevel, "(bezier (pts " );

 for( const wxPoint& pt : { aBezier->GetStart(), aBezier->GetBezierC1(),
 aBezier->GetBezierC2(), aBezier->GetEnd() } )
 {
 aFormatter->Print( 0, " (xy %s %s)",
 FormatInternalUnits( pt.x ).c_str(),
 FormatInternalUnits( pt.y ).c_str() );
 }

 aFormatter->Print( 0, ")\n" ); // Closes pts token on same line.

 formatStroke( aFormatter, aNestLevel + 1, aStroke );
 aFormatter->Print( 0, "\n" );
 formatFill( aFormatter, aNestLevel + 1, aFillMode, aFillColor );
 aFormatter->Print( 0, "\n" );

 if( aUuid != niluuid )
 aFormatter->Print( aNestLevel + 1, "(uuid %s)\n", TO_UTF8( aUuid.AsString() ) );

 aFormatter->Print( aNestLevel, ")\n" );
}


static void formatPoly( OUTPUTFORMATTER* aFormatter, int aNestLevel, EDA_SHAPE* aPolyLine,
 const STROKE_PARAMS& aStroke, FILL_T aFillMode, const COLOR4D& aFillColor,
 KIID aUuid = niluuid )
{
 int newLine = 0;
 int lineCount = 1;
 aFormatter->Print( aNestLevel, "(polyline\n" );
 aFormatter->Print( aNestLevel + 1, "(pts" );

 for( const VECTOR2I& pt : aPolyLine->GetPolyShape().Outline( 0 ).CPoints() )
 {
 if( newLine == 4 || !ADVANCED_CFG::GetCfg().m_CompactSave )
 {
 aFormatter->Print( 0, "\n" );
 aFormatter->Print( aNestLevel + 2, "(xy %s %s)",
 FormatInternalUnits( pt.x ).c_str(),
 FormatInternalUnits( pt.y ).c_str() );
 newLine = 0;
 lineCount += 1;
 }
 else
 {
 aFormatter->Print( 0, " (xy %s %s)",
 FormatInternalUnits( pt.x ).c_str(),
 FormatInternalUnits( pt.y ).c_str() );
 }

 newLine += 1;
 }

 if( lineCount == 1 )
 {
 aFormatter->Print( 0, ")\n" ); // Closes pts token on same line.
 }
 else
 {
 aFormatter->Print( 0, "\n" );
 aFormatter->Print( aNestLevel + 1, ")\n" ); // Closes pts token with multiple lines.
 }

 formatStroke( aFormatter, aNestLevel + 1, aStroke );
 aFormatter->Print( 0, "\n" );
 formatFill( aFormatter, aNestLevel + 1, aFillMode, aFillColor );
 aFormatter->Print( 0, "\n" );

 if( aUuid != niluuid )
 aFormatter->Print( aNestLevel + 1, "(uuid %s)\n", TO_UTF8( aUuid.AsString() ) );

 aFormatter->Print( aNestLevel, ")\n" );
}


class SCH_SEXPR_PLUGIN_CACHE
{
 static int m_modHash; // Keep track of the modification status of the library.

 wxString m_fileName; // Absolute path and file name.
 wxFileName m_libFileName; // Absolute path and file name is required here.
 wxDateTime m_fileModTime;
 LIB_SYMBOL_MAP m_symbols; // Map of names of #LIB_SYMBOL pointers.
 bool m_isWritable;
 bool m_isModified;
 int m_versionMajor;
 SCH_LIB_TYPE m_libType; // Is this cache a symbol or symbol library.

 LIB_SYMBOL* removeSymbol( LIB_SYMBOL* aAlias );

 static void saveSymbolDrawItem( LIB_ITEM* aItem, OUTPUTFORMATTER& aFormatter,
 int aNestLevel );
 static void saveField( LIB_FIELD* aField, OUTPUTFORMATTER& aFormatter, int aNestLevel );
 static void savePin( LIB_PIN* aPin, OUTPUTFORMATTER& aFormatter, int aNestLevel = 0 );
 static void saveText( LIB_TEXT* aText, OUTPUTFORMATTER& aFormatter, int aNestLevel = 0 );

 static void saveDcmInfoAsFields( LIB_SYMBOL* aSymbol, OUTPUTFORMATTER& aFormatter,
 int& aNextFreeFieldId, int aNestLevel );

 friend SCH_SEXPR_PLUGIN;

public:
 SCH_SEXPR_PLUGIN_CACHE( const wxString& aLibraryPath );
 ~SCH_SEXPR_PLUGIN_CACHE();

 int GetModifyHash() const { return m_modHash; }

 // Most all functions in this class throw IO_ERROR exceptions. There are no
 // error codes nor user interface calls from here, nor in any SCH_PLUGIN objects.
 // Catch these exceptions higher up please.

 void Save();

 void Load();

 void AddSymbol( const LIB_SYMBOL* aSymbol );

 void DeleteSymbol( const wxString& aName );

 // If m_libFileName is a symlink follow it to the real source file
 wxFileName GetRealFile() const;

 wxDateTime GetLibModificationTime();

 bool IsFile( const wxString& aFullPathAndFileName ) const;

 bool IsFileChanged() const;

 void SetModified( bool aModified = true ) { m_isModified = aModified; }

 wxString GetLogicalName() const { return m_libFileName.GetName(); }

 void SetFileName( const wxString& aFileName ) { m_libFileName = aFileName; }

 wxString GetFileName() const { return m_libFileName.GetFullPath(); }

 static void SaveSymbol( LIB_SYMBOL* aSymbol, OUTPUTFORMATTER& aFormatter,
 int aNestLevel = 0, const wxString& aLibName = wxEmptyString );
};


SCH_SEXPR_PLUGIN::SCH_SEXPR_PLUGIN() :
 m_progressReporter( nullptr )
{
 init( nullptr );
}


SCH_SEXPR_PLUGIN::~SCH_SEXPR_PLUGIN()
{
 delete m_cache;
}


void SCH_SEXPR_PLUGIN::init( SCHEMATIC* aSchematic, const PROPERTIES* aProperties )
{
 m_version = 0;
 m_rootSheet = nullptr;
 m_schematic = aSchematic;
 m_cache = nullptr;
 m_out = nullptr;
 m_nextFreeFieldId = 100; // number arbitrarily > MANDATORY_FIELDS or SHEET_MANDATORY_FIELDS
}


SCH_SHEET* SCH_SEXPR_PLUGIN::Load( const wxString& aFileName, SCHEMATIC* aSchematic,
 SCH_SHEET* aAppendToMe, const PROPERTIES* aProperties )
{
 wxASSERT( !aFileName || aSchematic != nullptr );

 LOCALE_IO toggle; // toggles on, then off, the C locale.
 SCH_SHEET* sheet;

 wxFileName fn = aFileName;

 // Unfortunately child sheet file names the legacy schematic file format are not fully
 // qualified and are always appended to the project path. The aFileName attribute must
 // always be an absolute path so the project path can be used for load child sheet files.
 wxASSERT( fn.IsAbsolute() );

 if( aAppendToMe )
 {
 wxLogTrace( traceSchLegacyPlugin, "Append \"%s\" to sheet \"%s\".",
 aFileName, aAppendToMe->GetFileName() );

 wxFileName normedFn = aAppendToMe->GetFileName();

 if( !normedFn.IsAbsolute() )
 {
 if( aFileName.Right( normedFn.GetFullPath().Length() ) == normedFn.GetFullPath() )
 m_path = aFileName.Left( aFileName.Length() - normedFn.GetFullPath().Length() );
 }

 if( m_path.IsEmpty() )
 m_path = aSchematic->Prj().GetProjectPath();

 wxLogTrace( traceSchLegacyPlugin, "Normalized append path \"%s\".", m_path );
 }
 else
 {
 m_path = aSchematic->Prj().GetProjectPath();
 }

 m_currentPath.push( m_path );
 init( aSchematic, aProperties );

 if( aAppendToMe == nullptr )
 {
 // Clean up any allocated memory if an exception occurs loading the schematic.
 std::unique_ptr<SCH_SHEET> newSheet = std::make_unique<SCH_SHEET>( aSchematic );

 wxFileName relPath( aFileName );
 // Do not use wxPATH_UNIX as option in MakeRelativeTo(). It can create incorrect
 // relative paths on Windows, because paths have a disk identifier (C:, D: ...)
 relPath.MakeRelativeTo( aSchematic->Prj().GetProjectPath() );

 newSheet->SetFileName( relPath.GetFullPath() );
 m_rootSheet = newSheet.get();
 loadHierarchy( newSheet.get() );

 // If we got here, the schematic loaded successfully.
 sheet = newSheet.release();
 m_rootSheet = nullptr; // Quiet Coverity warning.
 }
 else
 {
 wxCHECK_MSG( aSchematic->IsValid(), nullptr, "Can't append to a schematic with no root!" );
 m_rootSheet = &aSchematic->Root();
 sheet = aAppendToMe;
 loadHierarchy( sheet );
 }

 wxASSERT( m_currentPath.size() == 1 ); // only the project path should remain

 m_currentPath.pop(); // Clear the path stack for next call to Load

 return sheet;
}


// Everything below this comment is recursive. Modify with care.

void SCH_SEXPR_PLUGIN::loadHierarchy( SCH_SHEET* aSheet )
{
 SCH_SCREEN* screen = nullptr;

 if( !aSheet->GetScreen() )
 {
 // SCH_SCREEN objects store the full path and file name where the SCH_SHEET object only
 // stores the file name and extension. Add the project path to the file name and
 // extension to compare when calling SCH_SHEET::SearchHierarchy().
 wxFileName fileName = aSheet->GetFileName();

 if( !fileName.IsAbsolute() )
 fileName.MakeAbsolute( m_currentPath.top() );

 // Save the current path so that it gets restored when descending and ascending the
 // sheet hierarchy which allows for sheet schematic files to be nested in folders
 // relative to the last path a schematic was loaded from.
 wxLogTrace( traceSchLegacyPlugin, "Saving path '%s'", m_currentPath.top() );
 m_currentPath.push( fileName.GetPath() );
 wxLogTrace( traceSchLegacyPlugin, "Current path '%s'", m_currentPath.top() );
 wxLogTrace( traceSchLegacyPlugin, "Loading '%s'", fileName.GetFullPath() );

 m_rootSheet->SearchHierarchy( fileName.GetFullPath(), &screen );

 if( screen )
 {
 aSheet->SetScreen( screen );
 aSheet->GetScreen()->SetParent( m_schematic );
 // Do not need to load the sub-sheets - this has already been done.
 }
 else
 {
 aSheet->SetScreen( new SCH_SCREEN( m_schematic ) );
 aSheet->GetScreen()->SetFileName( fileName.GetFullPath() );

 try
 {
 loadFile( fileName.GetFullPath(), aSheet );
 }
 catch( const IO_ERROR& ioe )
 {
 // If there is a problem loading the root sheet, there is no recovery.
 if( aSheet == m_rootSheet )
 throw;

 // For all subsheets, queue up the error message for the caller.
 if( !m_error.IsEmpty() )
 m_error += "\n";

 m_error += ioe.What();
 }

 if( fileName.FileExists() )
 {
 aSheet->GetScreen()->SetFileReadOnly( !fileName.IsFileWritable() );
 aSheet->GetScreen()->SetFileExists( true );
 }
 else
 {
 aSheet->GetScreen()->SetFileReadOnly( !fileName.IsDirWritable() );
 aSheet->GetScreen()->SetFileExists( false );
 }

 // This was moved out of the try{} block so that any sheets definitionsthat
 // the plugin fully parsed before the exception was raised will be loaded.
 for( SCH_ITEM* aItem : aSheet->GetScreen()->Items().OfType( SCH_SHEET_T ) )
 {
 wxCHECK2( aItem->Type() == SCH_SHEET_T, /* do nothing */ );
 SCH_SHEET* sheet = static_cast<SCH_SHEET*>( aItem );

 // Recursion starts here.
 loadHierarchy( sheet );
 }
 }

 m_currentPath.pop();
 wxLogTrace( traceSchLegacyPlugin, "Restoring path \"%s\"", m_currentPath.top() );
 }
}


void SCH_SEXPR_PLUGIN::loadFile( const wxString& aFileName, SCH_SHEET* aSheet )
{
 FILE_LINE_READER reader( aFileName );

 size_t lineCount = 0;

 if( m_progressReporter )
 {
 m_progressReporter->Report( wxString::Format( _( "Loading %s..." ), aFileName ) );

 if( !m_progressReporter->KeepRefreshing() )
 THROW_IO_ERROR( ( "Open cancelled by user." ) );

 while( reader.ReadLine() )
 lineCount++;

 reader.Rewind();
 }

 SCH_SEXPR_PARSER parser( &reader, m_progressReporter, lineCount );

 parser.ParseSchematic( aSheet );
}


void SCH_SEXPR_PLUGIN::LoadContent( LINE_READER& aReader, SCH_SHEET* aSheet, int aFileVersion )
{
 wxCHECK( aSheet, /* void */ );

 LOCALE_IO toggle;
 SCH_SEXPR_PARSER parser( &aReader );

 parser.ParseSchematic( aSheet, true, aFileVersion );
}


void SCH_SEXPR_PLUGIN::Save( const wxString& aFileName, SCH_SHEET* aSheet, SCHEMATIC* aSchematic,
 const PROPERTIES* aProperties )
{
 wxCHECK_RET( aSheet != nullptr, "NULL SCH_SHEET object." );
 wxCHECK_RET( !aFileName.IsEmpty(), "No schematic file name defined." );

 LOCALE_IO toggle; // toggles on, then off, the C locale, to write floating point values.

 init( aSchematic, aProperties );

 wxFileName fn = aFileName;

 // File names should be absolute. Don't assume everything relative to the project path
 // works properly.
 wxASSERT( fn.IsAbsolute() );

 FILE_OUTPUTFORMATTER formatter( fn.GetFullPath() );

 m_out = &formatter; // no ownership

 Format( aSheet );

 aSheet->GetScreen()->SetFileExists( true );
}


void SCH_SEXPR_PLUGIN::Format( SCH_SHEET* aSheet )
{
 wxCHECK_RET( aSheet != nullptr, "NULL SCH_SHEET* object." );
 wxCHECK_RET( m_schematic != nullptr, "NULL SCHEMATIC* object." );

 SCH_SCREEN* screen = aSheet->GetScreen();

 wxCHECK( screen, /* void */ );

 m_out->Print( 0, "(kicad_sch (version %d) (generator eeschema)\n\n",
 SEXPR_SCHEMATIC_FILE_VERSION );

 m_out->Print( 1, "(uuid %s)\n\n", TO_UTF8( screen->m_uuid.AsString() ) );

 screen->GetPageSettings().Format( m_out, 1, 0 );
 m_out->Print( 0, "\n" );
 screen->GetTitleBlock().Format( m_out, 1, 0 );

 // Save cache library.
 m_out->Print( 1, "(lib_symbols\n" );

 for( auto libSymbol : screen->GetLibSymbols() )
 SCH_SEXPR_PLUGIN_CACHE::SaveSymbol( libSymbol.second, *m_out, 2, libSymbol.first );

 m_out->Print( 1, ")\n\n" );

 for( const auto& alias : screen->GetBusAliases() )
 {
 saveBusAlias( alias, 1 );
 }

 // Enforce item ordering
 auto cmp =
 []( const SCH_ITEM* a, const SCH_ITEM* b )
 {
 if( a->Type() != b->Type() )
 return a->Type() < b->Type();

 return a->m_Uuid < b->m_Uuid;
 };

 std::multiset<SCH_ITEM*, decltype( cmp )> save_map( cmp );

 for( SCH_ITEM* item : screen->Items() )
 save_map.insert( item );

 KICAD_T itemType = TYPE_NOT_INIT;
 SCH_LAYER_ID layer = SCH_LAYER_ID_START;

 for( SCH_ITEM* item : save_map )
 {
 if( itemType != item->Type() )
 {
 itemType = item->Type();

 if( itemType != SCH_SYMBOL_T
 && itemType != SCH_JUNCTION_T
 && itemType != SCH_SHEET_T )
 {
 m_out->Print( 0, "\n" );
 }
 }

 switch( item->Type() )
 {
 case SCH_SYMBOL_T:
 m_out->Print( 0, "\n" );
 saveSymbol( static_cast<SCH_SYMBOL*>( item ), nullptr, 1 );
 break;

 case SCH_BITMAP_T:
 saveBitmap( static_cast<SCH_BITMAP*>( item ), 1 );
 break;

 case SCH_SHEET_T:
 m_out->Print( 0, "\n" );
 saveSheet( static_cast<SCH_SHEET*>( item ), 1 );
 break;

 case SCH_JUNCTION_T:
 saveJunction( static_cast<SCH_JUNCTION*>( item ), 1 );
 break;

 case SCH_NO_CONNECT_T:
 saveNoConnect( static_cast<SCH_NO_CONNECT*>( item ), 1 );
 break;

 case SCH_BUS_WIRE_ENTRY_T:
 case SCH_BUS_BUS_ENTRY_T:
 saveBusEntry( static_cast<SCH_BUS_ENTRY_BASE*>( item ), 1 );
 break;

 case SCH_LINE_T:
 if( layer != item->GetLayer() )
 {
 if( layer == SCH_LAYER_ID_START )
 {
 layer = item->GetLayer();
 }
 else
 {
 layer = item->GetLayer();
 m_out->Print( 0, "\n" );
 }
 }

 saveLine( static_cast<SCH_LINE*>( item ), 1 );
 break;

 case SCH_TEXT_T:
 case SCH_LABEL_T:
 case SCH_GLOBAL_LABEL_T:
 case SCH_HIER_LABEL_T:
 saveText( static_cast<SCH_TEXT*>( item ), 1 );
 break;

 default:
 wxASSERT( "Unexpected schematic object type in SCH_SEXPR_PLUGIN::Format()" );
 }
 }

 // If this is the root sheet, save all of the sheet paths.
 if( aSheet->IsRootSheet() )
 {
 SCH_SHEET_LIST sheetPaths( aSheet, true );

 SCH_REFERENCE_LIST symbolInstances;

 for( const SCH_SHEET_PATH& sheetPath : sheetPaths )
 sheetPath.GetSymbols( symbolInstances, true, true );

 symbolInstances.SortByReferenceOnly();

 saveInstances( sheetPaths.GetSheetInstances(), symbolInstances.GetSymbolInstances(), 1 );
 }
 else
 {
 // Schematic files (SCH_SCREEN objects) can be shared so we have to save and restore
 // symbol and sheet instance data even if the file being saved is not the root sheet
 // because it is possible that the file is the root sheet of another project.
 saveInstances( screen->m_sheetInstances, screen->m_symbolInstances, 1 );
 }

 m_out->Print( 0, ")\n" );
}


void SCH_SEXPR_PLUGIN::Format( EE_SELECTION* aSelection, SCH_SHEET_PATH* aSelectionPath,
 SCH_SHEET_LIST* aFullSheetHierarchy,
 OUTPUTFORMATTER* aFormatter )
{
 wxCHECK( aSelection && aSelectionPath && aFullSheetHierarchy && aFormatter, /* void */ );

 LOCALE_IO toggle;

 m_out = aFormatter;

 size_t i;
 SCH_ITEM* item;
 std::map<wxString, LIB_SYMBOL*> libSymbols;
 SCH_SCREEN* screen = aSelection->GetScreen();

 for( i = 0; i < aSelection->GetSize(); ++i )
 {
 item = dynamic_cast<SCH_ITEM*>( aSelection->GetItem( i ) );

 wxCHECK2( item, continue );

 if( item->Type() != SCH_SYMBOL_T )
 continue;

 SCH_SYMBOL* symbol = dynamic_cast<SCH_SYMBOL*>( item );

 wxCHECK2( symbol, continue );

 wxString libSymbolLookup = symbol->GetLibId().Format().wx_str();

 if( !symbol->UseLibIdLookup() )
 libSymbolLookup = symbol->GetSchSymbolLibraryName();

 auto it = screen->GetLibSymbols().find( libSymbolLookup );

 if( it != screen->GetLibSymbols().end() )
 libSymbols[ libSymbolLookup ] = it->second;
 }

 if( !libSymbols.empty() )
 {
 m_out->Print( 0, "(lib_symbols\n" );

 for( auto libSymbol : libSymbols )
 SCH_SEXPR_PLUGIN_CACHE::SaveSymbol( libSymbol.second, *m_out, 1, libSymbol.first );

 m_out->Print( 0, ")\n\n" );
 }

 // Store the selected sheets instance information
 SCH_SHEET_LIST selectedSheets;
 selectedSheets.push_back( *aSelectionPath ); // Include the "root" of the selection

 SCH_REFERENCE_LIST selectedSymbols;

 for( i = 0; i < aSelection->GetSize(); ++i )
 {
 item = (SCH_ITEM*) aSelection->GetItem( i );

 switch( item->Type() )
 {
 case SCH_SYMBOL_T:
 saveSymbol( static_cast<SCH_SYMBOL*>( item ), aSelectionPath, 0 );

 aSelectionPath->AppendSymbol( selectedSymbols, static_cast<SCH_SYMBOL*>( item ),
 true, true );
 break;

 case SCH_BITMAP_T:
 saveBitmap( static_cast< SCH_BITMAP* >( item ), 0 );
 break;

 case SCH_SHEET_T:
 saveSheet( static_cast< SCH_SHEET* >( item ), 0 );

 {
 SCH_SHEET_PATH subSheetPath = *aSelectionPath;
 subSheetPath.push_back( static_cast<SCH_SHEET*>( item ) );

 aFullSheetHierarchy->GetSheetsWithinPath( selectedSheets, subSheetPath );
 aFullSheetHierarchy->GetSymbolsWithinPath( selectedSymbols, subSheetPath, true,
 true );
 }

 break;

 case SCH_JUNCTION_T:
 saveJunction( static_cast< SCH_JUNCTION* >( item ), 0 );
 break;

 case SCH_NO_CONNECT_T:
 saveNoConnect( static_cast< SCH_NO_CONNECT* >( item ), 0 );
 break;

 case SCH_BUS_WIRE_ENTRY_T:
 case SCH_BUS_BUS_ENTRY_T:
 saveBusEntry( static_cast< SCH_BUS_ENTRY_BASE* >( item ), 0 );
 break;

 case SCH_LINE_T:
 saveLine( static_cast< SCH_LINE* >( item ), 0 );
 break;

 case SCH_TEXT_T:
 case SCH_LABEL_T:
 case SCH_GLOBAL_LABEL_T:
 case SCH_HIER_LABEL_T:
 saveText( static_cast< SCH_TEXT* >( item ), 0 );
 break;

 default:
 wxASSERT( "Unexpected schematic object type in SCH_SEXPR_PLUGIN::Format()" );
 }
 }

 // Make all instance information relative to the selection path
 KIID_PATH selectionPath = aSelectionPath->PathWithoutRootUuid();

 selectedSheets.SortByPageNumbers();
 std::vector<SCH_SHEET_INSTANCE> sheetinstances = selectedSheets.GetSheetInstances();

 for( SCH_SHEET_INSTANCE& sheetInstance : sheetinstances )
 {
 wxASSERT_MSG( sheetInstance.m_Path.MakeRelativeTo( selectionPath ),
 "Sheet is not inside the selection path?" );
 }


 selectedSymbols.SortByReferenceOnly();
 std::vector<SYMBOL_INSTANCE_REFERENCE> symbolInstances = selectedSymbols.GetSymbolInstances();

 for( SYMBOL_INSTANCE_REFERENCE& symbolInstance : symbolInstances )
 {
 wxASSERT_MSG( symbolInstance.m_Path.MakeRelativeTo( selectionPath ),
 "Symbol is not inside the selection path?" );
 }

 saveInstances( sheetinstances, symbolInstances, 0 );
}


void SCH_SEXPR_PLUGIN::saveSymbol( SCH_SYMBOL* aSymbol, SCH_SHEET_PATH* aSheetPath,
 int aNestLevel )
{
 wxCHECK_RET( aSymbol != nullptr && m_out != nullptr, "" );

 std::string libName;
 wxArrayString reference_fields;

 static wxString delimiters( wxT( " " ) );

 wxString symbol_name = aSymbol->GetLibId().Format();

 if( symbol_name.size() )
 {
 libName = toUTFTildaText( symbol_name );
 }
 else
 {
 libName = "_NONAME_";
 }

 double angle;
 int orientation = aSymbol->GetOrientation() & ~( SYM_MIRROR_X | SYM_MIRROR_Y );

 if( orientation == SYM_ORIENT_90 )
 angle = 90.0;
 else if( orientation == SYM_ORIENT_180 )
 angle = 180.0;
 else if( orientation == SYM_ORIENT_270 )
 angle = 270.0;
 else
 angle = 0.0;

 m_out->Print( aNestLevel, "(symbol" );

 if( !aSymbol->UseLibIdLookup() )
 {
 m_out->Print( 0, " (lib_name %s)",
 m_out->Quotew( aSymbol->GetSchSymbolLibraryName() ).c_str() );
 }

 m_out->Print( 0, " (lib_id %s) (at %s %s %s)",
 m_out->Quotew( aSymbol->GetLibId().Format().wx_str() ).c_str(),
 FormatInternalUnits( aSymbol->GetPosition().x ).c_str(),
 FormatInternalUnits( aSymbol->GetPosition().y ).c_str(),
 FormatAngle( angle * 10.0 ).c_str() );

 bool mirrorX = aSymbol->GetOrientation() & SYM_MIRROR_X;
 bool mirrorY = aSymbol->GetOrientation() & SYM_MIRROR_Y;

 if( mirrorX || mirrorY )
 {
 m_out->Print( 0, " (mirror" );

 if( mirrorX )
 m_out->Print( 0, " x" );

 if( mirrorY )
 m_out->Print( 0, " y" );

 m_out->Print( 0, ")" );
 }

 int unit = ( aSymbol->GetInstanceReferences().size() == 0 ) ?
 aSymbol->GetUnit() :
 aSymbol->GetInstanceReferences()[0].m_Unit;

 m_out->Print( 0, " (unit %d)", unit );

 if( aSymbol->GetConvert() == LIB_ITEM::LIB_CONVERT::DEMORGAN )
 m_out->Print( 0, " (convert %d)", aSymbol->GetConvert() );

 m_out->Print( 0, "\n" );

 m_out->Print( aNestLevel + 1, "(in_bom %s)", ( aSymbol->GetIncludeInBom() ) ? "yes" : "no" );
 m_out->Print( 0, " (on_board %s)", ( aSymbol->GetIncludeOnBoard() ) ? "yes" : "no" );

 if( aSymbol->GetFieldsAutoplaced() != FIELDS_AUTOPLACED_NO )
 m_out->Print( 0, " (fields_autoplaced)" );

 m_out->Print( 0, "\n" );

 m_out->Print( aNestLevel + 1, "(uuid %s)\n", TO_UTF8( aSymbol->m_Uuid.AsString() ) );

 m_nextFreeFieldId = MANDATORY_FIELDS;

 for( SCH_FIELD& field : aSymbol->GetFields() )
 {
 int id = field.GetId();
 wxString value = field.GetText();

 // The instance fields are always set to the first sheet instance of the project to
 // schematic file changes when switching sheet instances with the current project
 // schematic. It does not solve the problem for schematics shared between projects.
 if( id == REFERENCE_FIELD )
 {
 field.SetText( ( aSymbol->GetInstanceReferences().size() == 0 ) ?
 value :
 aSymbol->GetInstanceReferences()[0].m_Reference );
 }
 else if( id == VALUE_FIELD )
 {
 field.SetText( ( aSymbol->GetInstanceReferences().size() == 0 ) ?
 value :
 aSymbol->GetInstanceReferences()[0].m_Value );
 }
 else if( id == FOOTPRINT_FIELD )
 {
 field.SetText( ( aSymbol->GetInstanceReferences().size() == 0 ) ?
 value :
 aSymbol->GetInstanceReferences()[0].m_Footprint );
 }

 try
 {
 saveField( &field, aNestLevel + 1 );
 }
 catch( ... )
 {
 // Restore the changed field text on write error.
 if( id == REFERENCE_FIELD || id == VALUE_FIELD || id == FOOTPRINT_FIELD )
 field.SetText( value );

 throw;
 }

 if( id == REFERENCE_FIELD || id == VALUE_FIELD || id == FOOTPRINT_FIELD )
 field.SetText( value );
 }

 for( const std::unique_ptr<SCH_PIN>& pin : aSymbol->GetRawPins() )
 {
 if( pin->GetAlt().IsEmpty() )
 {
 m_out->Print( aNestLevel + 1, "(pin %s (uuid %s))\n",
 m_out->Quotew( pin->GetNumber() ).c_str(),
 TO_UTF8( pin->m_Uuid.AsString() ) );
 }
 else
 {
 m_out->Print( aNestLevel + 1, "(pin %s (uuid %s) (alternate %s))\n",
 m_out->Quotew( pin->GetNumber() ).c_str(),
 TO_UTF8( pin->m_Uuid.AsString() ),
 m_out->Quotew( pin->GetAlt() ).c_str() );
 }
 }

 m_out->Print( aNestLevel, ")\n" );
}


void SCH_SEXPR_PLUGIN::saveField( SCH_FIELD* aField, int aNestLevel )
{
 wxCHECK_RET( aField != nullptr && m_out != nullptr, "" );

 wxString fieldName = aField->GetName();

 // For some reason (bug in legacy parser?) the field ID for non-mandatory fields is -1 so
 // check for this in order to correctly use the field name.
 if( aField->GetParent()->Type() == SCH_SYMBOL_T )
 {
 if( aField->GetId() >= 0 && aField->GetId() < MANDATORY_FIELDS )
 fieldName = TEMPLATE_FIELDNAME::GetDefaultFieldName( aField->GetId(), false );
 }
 else if( aField->GetParent()->Type() == SCH_SHEET_T )
 {
 if( aField->GetId() >= 0 && aField->GetId() < SHEET_MANDATORY_FIELDS )
 fieldName = SCH_SHEET::GetDefaultFieldName( aField->GetId(), false );
 }

 if( aField->GetId() == -1 /* undefined ID */ )
 {
 aField->SetId( m_nextFreeFieldId );
 m_nextFreeFieldId += 1;
 }
 else if( aField->GetId() >= m_nextFreeFieldId )
 {
 m_nextFreeFieldId = aField->GetId() + 1;
 }

 m_out->Print( aNestLevel, "(property %s %s (id %d) (at %s %s %s)",
 m_out->Quotew( fieldName ).c_str(),
 m_out->Quotew( aField->GetText() ).c_str(),
 aField->GetId(),
 FormatInternalUnits( aField->GetPosition().x ).c_str(),
 FormatInternalUnits( aField->GetPosition().y ).c_str(),
 FormatAngle( aField->GetTextAngleDegrees() * 10.0 ).c_str() );

 if( !aField->IsDefaultFormatting()
 || ( aField->GetTextHeight() != Mils2iu( DEFAULT_SIZE_TEXT ) ) )
 {
 m_out->Print( 0, "\n" );
 aField->Format( m_out, aNestLevel, 0 );
 m_out->Print( aNestLevel, ")\n" ); // Closes property token with font effects.
 }
 else
 {
 m_out->Print( 0, ")\n" ); // Closes property token without font effects.
 }
}


void SCH_SEXPR_PLUGIN::saveBitmap( SCH_BITMAP* aBitmap, int aNestLevel )
{
 wxCHECK_RET( aBitmap != nullptr && m_out != nullptr, "" );

 const wxImage* image = aBitmap->GetImage()->GetImageData();

 wxCHECK_RET( image != nullptr, "wxImage* is NULL" );

 m_out->Print( aNestLevel, "(image (at %s %s)",
 FormatInternalUnits( aBitmap->GetPosition().x ).c_str(),
 FormatInternalUnits( aBitmap->GetPosition().y ).c_str() );

 if( aBitmap->GetImage()->GetScale() != 1.0 )
 m_out->Print( 0, " (scale %g)", aBitmap->GetImage()->GetScale() );

 m_out->Print( 0, "\n" );

 m_out->Print( aNestLevel + 1, "(uuid %s)\n", TO_UTF8( aBitmap->m_Uuid.AsString() ) );

 m_out->Print( aNestLevel + 1, "(data" );

 wxMemoryOutputStream stream;

 image->SaveFile( stream, wxBITMAP_TYPE_PNG );

 // Write binary data in hexadecimal form (ASCII)
 wxStreamBuffer* buffer = stream.GetOutputStreamBuffer();
 wxString out = wxBase64Encode( buffer->GetBufferStart(), buffer->GetBufferSize() );

 // Apparently the MIME standard character width for base64 encoding is 76 (unconfirmed)
 // so use it in a vein attempt to be standard like.
#define MIME_BASE64_LENGTH 76

 size_t first = 0;

 while( first < out.Length() )
 {
 m_out->Print( 0, "\n" );
 m_out->Print( aNestLevel + 2, "%s", TO_UTF8( out( first, MIME_BASE64_LENGTH ) ) );
 first += MIME_BASE64_LENGTH;
 }

 m_out->Print( 0, "\n" );
 m_out->Print( aNestLevel + 1, ")\n" ); // Closes data token.
 m_out->Print( aNestLevel, ")\n" ); // Closes image token.
}


void SCH_SEXPR_PLUGIN::saveSheet( SCH_SHEET* aSheet, int aNestLevel )
{
 wxCHECK_RET( aSheet != nullptr && m_out != nullptr, "" );

 m_out->Print( aNestLevel, "(sheet (at %s %s) (size %s %s)",
 FormatInternalUnits( aSheet->GetPosition().x ).c_str(),
 FormatInternalUnits( aSheet->GetPosition().y ).c_str(),
 FormatInternalUnits( aSheet->GetSize().GetWidth() ).c_str(),
 FormatInternalUnits( aSheet->GetSize().GetHeight() ).c_str() );

 if( aSheet->GetFieldsAutoplaced() != FIELDS_AUTOPLACED_NO )
 m_out->Print( 0, " (fields_autoplaced)" );

 m_out->Print( 0, "\n" );

 STROKE_PARAMS stroke( aSheet->GetBorderWidth(), PLOT_DASH_TYPE::SOLID,
 aSheet->GetBorderColor() );

 stroke.SetWidth( aSheet->GetBorderWidth() );
 formatStroke( m_out, aNestLevel + 1, stroke );

 m_out->Print( 0, "\n" );

 m_out->Print( aNestLevel + 1, "(fill (color %d %d %d %0.4f))\n",
 KiROUND( aSheet->GetBackgroundColor().r * 255.0 ),
 KiROUND( aSheet->GetBackgroundColor().g * 255.0 ),
 KiROUND( aSheet->GetBackgroundColor().b * 255.0 ),
 aSheet->GetBackgroundColor().a );

 m_out->Print( aNestLevel + 1, "(uuid %s)\n", TO_UTF8( aSheet->m_Uuid.AsString() ) );

 m_nextFreeFieldId = SHEET_MANDATORY_FIELDS;

 for( SCH_FIELD& field : aSheet->GetFields() )
 {
 saveField( &field, aNestLevel + 1 );
 }

 for( const SCH_SHEET_PIN* pin : aSheet->GetPins() )
 {
 m_out->Print( aNestLevel + 1, "(pin %s %s (at %s %s %s)\n",
 EscapedUTF8( pin->GetText() ).c_str(),
 getSheetPinShapeToken( pin->GetShape() ),
 FormatInternalUnits( pin->GetPosition().x ).c_str(),
 FormatInternalUnits( pin->GetPosition().y ).c_str(),
 FormatAngle( getSheetPinAngle( pin->GetSide() ) * 10.0 ).c_str() );

 pin->Format( m_out, aNestLevel + 1, 0 );

 m_out->Print( aNestLevel + 2, "(uuid %s)\n", TO_UTF8( pin->m_Uuid.AsString() ) );

 m_out->Print( aNestLevel + 1, ")\n" ); // Closes pin token.
 }

 m_out->Print( aNestLevel, ")\n" ); // Closes sheet token.
}


void SCH_SEXPR_PLUGIN::saveJunction( SCH_JUNCTION* aJunction, int aNestLevel )
{
 wxCHECK_RET( aJunction != nullptr && m_out != nullptr, "" );

 m_out->Print( aNestLevel, "(junction (at %s %s) (diameter %s) (color %d %d %d %s)\n",
 FormatInternalUnits( aJunction->GetPosition().x ).c_str(),
 FormatInternalUnits( aJunction->GetPosition().y ).c_str(),
 FormatInternalUnits( aJunction->GetDiameter() ).c_str(),
 KiROUND( aJunction->GetColor().r * 255.0 ),
 KiROUND( aJunction->GetColor().g * 255.0 ),
 KiROUND( aJunction->GetColor().b * 255.0 ),
 Double2Str( aJunction->GetColor().a ).c_str() );

 m_out->Print( aNestLevel + 1, "(uuid %s)\n", TO_UTF8( aJunction->m_Uuid.AsString() ) );

 m_out->Print( aNestLevel, ")\n" );
}


void SCH_SEXPR_PLUGIN::saveNoConnect( SCH_NO_CONNECT* aNoConnect, int aNestLevel )
{
 wxCHECK_RET( aNoConnect != nullptr && m_out != nullptr, "" );

 m_out->Print( aNestLevel, "(no_connect (at %s %s) (uuid %s))\n",
 FormatInternalUnits( aNoConnect->GetPosition().x ).c_str(),
 FormatInternalUnits( aNoConnect->GetPosition().y ).c_str(),
 TO_UTF8( aNoConnect->m_Uuid.AsString() ) );
}


void SCH_SEXPR_PLUGIN::saveBusEntry( SCH_BUS_ENTRY_BASE* aBusEntry, int aNestLevel )
{
 wxCHECK_RET( aBusEntry != nullptr && m_out != nullptr, "" );

 // Bus to bus entries are converted to bus line segments.
 if( aBusEntry->GetClass() == "SCH_BUS_BUS_ENTRY" )
 {
 SCH_LINE busEntryLine( aBusEntry->GetPosition(), LAYER_BUS );

 busEntryLine.SetEndPoint( aBusEntry->GetEnd() );
 saveLine( &busEntryLine, aNestLevel );
 }
 else
 {
 m_out->Print( aNestLevel, "(bus_entry (at %s %s) (size %s %s)\n",
 FormatInternalUnits( aBusEntry->GetPosition().x ).c_str(),
 FormatInternalUnits( aBusEntry->GetPosition().y ).c_str(),
 FormatInternalUnits( aBusEntry->GetSize().GetWidth() ).c_str(),
 FormatInternalUnits( aBusEntry->GetSize().GetHeight() ).c_str() );

 formatStroke( m_out, aNestLevel + 1, aBusEntry->GetStroke() );

 m_out->Print( 0, "\n" );

 m_out->Print( aNestLevel + 1, "(uuid %s)\n", TO_UTF8( aBusEntry->m_Uuid.AsString() ) );

 m_out->Print( aNestLevel, ")\n" );
 }
}


void SCH_SEXPR_PLUGIN::saveLine( SCH_LINE* aLine, int aNestLevel )
{
 wxCHECK_RET( aLine != nullptr && m_out != nullptr, "" );

 wxString lineType;

 STROKE_PARAMS line_stroke = aLine->GetStroke();

 switch( aLine->GetLayer() )
 {
 case LAYER_BUS: lineType = "bus"; break;
 case LAYER_WIRE: lineType = "wire"; break;
 case LAYER_NOTES:
 default: lineType = "polyline"; break;
 }

 m_out->Print( aNestLevel, "(%s (pts (xy %s %s) (xy %s %s))\n",
 TO_UTF8( lineType ),
 FormatInternalUnits( aLine->GetStartPoint().x ).c_str(),
 FormatInternalUnits( aLine->GetStartPoint().y ).c_str(),
 FormatInternalUnits( aLine->GetEndPoint().x ).c_str(),
 FormatInternalUnits( aLine->GetEndPoint().y ).c_str() );

 formatStroke( m_out, aNestLevel + 1, line_stroke );
 m_out->Print( 0, "\n" );

 m_out->Print( aNestLevel + 1, "(uuid %s)\n", TO_UTF8( aLine->m_Uuid.AsString() ) );

 m_out->Print( aNestLevel, ")\n" );
}


void SCH_SEXPR_PLUGIN::saveText( SCH_TEXT* aText, int aNestLevel )
{
 wxCHECK_RET( aText != nullptr && m_out != nullptr, "" );

 double angle;

 switch( aText->GetLabelSpinStyle() )
 {
 case LABEL_SPIN_STYLE::RIGHT: angle = 0.0; break;
 case LABEL_SPIN_STYLE::UP: angle = 90.0; break;
 case LABEL_SPIN_STYLE::LEFT: angle = 180.0; break;
 case LABEL_SPIN_STYLE::BOTTOM: angle = 270.0; break;
 default: wxFAIL; angle = 0.0; break;
 }

 m_out->Print( aNestLevel, "(%s %s",
 getTextTypeToken( aText->Type() ),
 m_out->Quotew( aText->GetText() ).c_str() );

 if( ( aText->Type() == SCH_GLOBAL_LABEL_T ) || ( aText->Type() == SCH_HIER_LABEL_T ) )
 m_out->Print( 0, " (shape %s)", getSheetPinShapeToken( aText->GetShape() ) );

 if( aText->GetText().Length() < 50 )
 {
 m_out->Print( 0, " (at %s %s %s)",
 FormatInternalUnits( aText->GetPosition().x ).c_str(),
 FormatInternalUnits( aText->GetPosition().y ).c_str(),
 FormatAngle( angle * 10.0 ).c_str() );
 }
 else
 {
 m_out->Print( 0, "\n" );
 m_out->Print( aNestLevel + 1, "(at %s %s %s)",
 FormatInternalUnits( aText->GetPosition().x ).c_str(),
 FormatInternalUnits( aText->GetPosition().y ).c_str(),
 FormatAngle( aText->GetTextAngle() ).c_str() );
 }

 if( aText->GetFieldsAutoplaced() != FIELDS_AUTOPLACED_NO )
 m_out->Print( 0, " (fields_autoplaced)" );

 m_out->Print( 0, "\n" );
 aText->Format( m_out, aNestLevel, 0 );

 m_out->Print( aNestLevel + 1, "(uuid %s)\n", TO_UTF8( aText->m_Uuid.AsString() ) );

 if( ( aText->Type() == SCH_GLOBAL_LABEL_T ) )
 {
 SCH_GLOBALLABEL* label = static_cast<SCH_GLOBALLABEL*>( aText );
 saveField( label->GetIntersheetRefs(), aNestLevel + 1 );
 }

 m_out->Print( aNestLevel, ")\n" ); // Closes text token.
}


void SCH_SEXPR_PLUGIN::saveBusAlias( std::shared_ptr<BUS_ALIAS> aAlias, int aNestLevel )
{
 wxCHECK_RET( aAlias != nullptr, "BUS_ALIAS* is NULL" );

 wxString members;

 for( auto member : aAlias->Members() )
 {
 if( members.IsEmpty() )
 members = m_out->Quotew( member );
 else
 members += " " + m_out->Quotew( member );
 }

 m_out->Print( aNestLevel, "(bus_alias %s (members %s))\n",
 m_out->Quotew( aAlias->GetName() ).c_str(),
 TO_UTF8( members ) );
}


void SCH_SEXPR_PLUGIN::saveInstances( const std::vector<SCH_SHEET_INSTANCE>& aSheets,
 const std::vector<SYMBOL_INSTANCE_REFERENCE>& aSymbols,
 int aNestLevel )
{
 if( aSheets.size() )
 {
 m_out->Print( 0, "\n" );
 m_out->Print( aNestLevel, "(sheet_instances\n" );

 for( const SCH_SHEET_INSTANCE& instance : aSheets )
 {
 wxString path = instance.m_Path.AsString();

 if( path.IsEmpty() )
 path = wxT( "/" ); // Root path

 m_out->Print( aNestLevel + 1, "(path %s (page %s))\n",
 m_out->Quotew( path ).c_str(),
 m_out->Quotew( instance.m_PageNumber ).c_str() );
 }

 m_out->Print( aNestLevel, ")\n" ); // Close sheet instances token.
 }

 if( aSymbols.size() )
 {
 m_out->Print( 0, "\n" );
 m_out->Print( aNestLevel, "(symbol_instances\n" );

 for( const SYMBOL_INSTANCE_REFERENCE& instance : aSymbols )
 {
 m_out->Print( aNestLevel + 1, "(path %s\n",
 m_out->Quotew( instance.m_Path.AsString() ).c_str() );
 m_out->Print( aNestLevel + 2, "(reference %s) (unit %d) (value %s) (footprint %s)\n",
 m_out->Quotew( instance.m_Reference ).c_str(),
 instance.m_Unit,
 m_out->Quotew( instance.m_Value ).c_str(),
 m_out->Quotew( instance.m_Footprint ).c_str() );
 m_out->Print( aNestLevel + 1, ")\n" );
 }

 m_out->Print( aNestLevel, ")\n" ); // Close symbol instances token.
 }
}


int SCH_SEXPR_PLUGIN_CACHE::m_modHash = 1; // starts at 1 and goes up


SCH_SEXPR_PLUGIN_CACHE::SCH_SEXPR_PLUGIN_CACHE( const wxString& aFullPathAndFileName ) :
 m_fileName( aFullPathAndFileName ),
 m_libFileName( aFullPathAndFileName ),
 m_isWritable( true ),
 m_isModified( false )
{
 m_versionMajor = -1;
 m_libType = SCH_LIB_TYPE::LT_EESCHEMA;
}


SCH_SEXPR_PLUGIN_CACHE::~SCH_SEXPR_PLUGIN_CACHE()
{
 // When the cache is destroyed, all of the alias objects on the heap should be deleted.
 for( LIB_SYMBOL_MAP::iterator it = m_symbols.begin(); it != m_symbols.end(); ++it )
 delete it->second;

 m_symbols.clear();
}


// If m_libFileName is a symlink follow it to the real source file
wxFileName SCH_SEXPR_PLUGIN_CACHE::GetRealFile() const
{
 wxFileName fn( m_libFileName );
 WX_FILENAME::ResolvePossibleSymlinks( fn );
 return fn;
}


wxDateTime SCH_SEXPR_PLUGIN_CACHE::GetLibModificationTime()
{
 wxFileName fn = GetRealFile();

 // update the writable flag while we have a wxFileName, in a network this
 // is possibly quite dynamic anyway.
 m_isWritable = fn.IsFileWritable();

 return fn.GetModificationTime();
}


bool SCH_SEXPR_PLUGIN_CACHE::IsFile( const wxString& aFullPathAndFileName ) const
{
 return m_fileName == aFullPathAndFileName;
}


bool SCH_SEXPR_PLUGIN_CACHE::IsFileChanged() const
{
 wxFileName fn = GetRealFile();

 if( m_fileModTime.IsValid() && fn.IsOk() && fn.FileExists() )
 return fn.GetModificationTime() != m_fileModTime;

 return false;
}


LIB_SYMBOL* SCH_SEXPR_PLUGIN_CACHE::removeSymbol( LIB_SYMBOL* aSymbol )
{
 wxCHECK_MSG( aSymbol != nullptr, nullptr, "NULL pointer cannot be removed from library." );

 LIB_SYMBOL* firstChild = nullptr;
 LIB_SYMBOL_MAP::iterator it = m_symbols.find( aSymbol->GetName() );

 if( it == m_symbols.end() )
 return nullptr;

 // If the entry pointer doesn't match the name it is mapped to in the library, we
 // have done something terribly wrong.
 wxCHECK_MSG( *it->second == aSymbol, nullptr,
 "Pointer mismatch while attempting to remove alias entry <" + aSymbol->GetName() +
 "> from library cache <" + m_libFileName.GetName() + ">." );

 // If the symbol is a root symbol used by other symbols find the first alias that uses
 // the root symbol and make it the new root.
 if( aSymbol->IsRoot() )
 {
 for( auto entry : m_symbols )
 {
 if( entry.second->IsAlias()
 && entry.second->GetParent().lock() == aSymbol->SharedPtr() )
 {
 firstChild = entry.second;
 break;
 }
 }

 if( firstChild )
 {
 for( LIB_ITEM& drawItem : aSymbol->GetDrawItems() )
 {
 if( drawItem.Type() == LIB_FIELD_T )
 {
 LIB_FIELD& field = static_cast<LIB_FIELD&>( drawItem );

 if( firstChild->FindField( field.GetCanonicalName() ) )
 continue;
 }

 LIB_ITEM* newItem = (LIB_ITEM*) drawItem.Clone();
 drawItem.SetParent( firstChild );
 firstChild->AddDrawItem( newItem );
 }

 // Reparent the remaining aliases.
 for( auto entry : m_symbols )
 {
 if( entry.second->IsAlias()
 && entry.second->GetParent().lock() == aSymbol->SharedPtr() )
 entry.second->SetParent( firstChild );
 }
 }
 }

 m_symbols.erase( it );
 delete aSymbol;
 m_isModified = true;
 ++m_modHash;
 return firstChild;
}


void SCH_SEXPR_PLUGIN_CACHE::AddSymbol( const LIB_SYMBOL* aSymbol )
{
 // aSymbol is cloned in SYMBOL_LIB::AddSymbol(). The cache takes ownership of aSymbol.
 wxString name = aSymbol->GetName();
 LIB_SYMBOL_MAP::iterator it = m_symbols.find( name );

 if( it != m_symbols.end() )
 {
 removeSymbol( it->second );
 }

 m_symbols[ name ] = const_cast< LIB_SYMBOL* >( aSymbol );
 m_isModified = true;
 ++m_modHash;
}


void SCH_SEXPR_PLUGIN_CACHE::Load()
{
 if( !m_libFileName.FileExists() )
 {
 THROW_IO_ERROR( wxString::Format( _( "Library file '%s' not found." ),
 m_libFileName.GetFullPath() ) );
 }

 wxCHECK_RET( m_libFileName.IsAbsolute(),
 wxString::Format( "Cannot use relative file paths in sexpr plugin to "
 "open library '%s'.", m_libFileName.GetFullPath() ) );

 // The current locale must use period as the decimal point.
 wxCHECK2( wxLocale::GetInfo( wxLOCALE_DECIMAL_POINT, wxLOCALE_CAT_NUMBER ) == ".",
 LOCALE_IO toggle );

 wxLogTrace( traceSchLegacyPlugin, "Loading sexpr symbol library file '%s'",
 m_libFileName.GetFullPath() );

 FILE_LINE_READER reader( m_libFileName.GetFullPath() );

 SCH_SEXPR_PARSER parser( &reader );

 parser.ParseLib( m_symbols );
 ++m_modHash;

 // Remember the file modification time of library file when the
 // cache snapshot was made, so that in a networked environment we will
 // reload the cache as needed.
 m_fileModTime = GetLibModificationTime();
}


void SCH_SEXPR_PLUGIN_CACHE::Save()
{
 if( !m_isModified )
 return;

 LOCALE_IO toggle; // toggles on, then off, the C locale.

 // Write through symlinks, don't replace them.
 wxFileName fn = GetRealFile();

 auto formatter = std::make_unique<FILE_OUTPUTFORMATTER>( fn.GetFullPath() );

 formatter->Print( 0, "(kicad_symbol_lib (version %d) (generator kicad_symbol_editor)\n",
 SEXPR_SYMBOL_LIB_FILE_VERSION );

 for( auto parent : m_symbols )
 {
 // Save the root symbol first so alias can inherit from them.
 if( parent.second->IsRoot() )
 {
 SaveSymbol( parent.second, *formatter.get(), 1 );

 // Save all of the aliases associated with the current root symbol.
 for( auto alias : m_symbols )
 {
 if( !alias.second->IsAlias() )
 continue;

 std::shared_ptr<LIB_SYMBOL> aliasParent = alias.second->GetParent().lock();

 if( aliasParent.get() != parent.second )
 continue;

 SaveSymbol( alias.second, *formatter.get(), 1 );
 }
 }
 }

 formatter->Print( 0, ")\n" );

 formatter.reset();

 m_fileModTime = fn.GetModificationTime();
 m_isModified = false;
}


void SCH_SEXPR_PLUGIN_CACHE::SaveSymbol( LIB_SYMBOL* aSymbol, OUTPUTFORMATTER& aFormatter,
 int aNestLevel, const wxString& aLibName )
{
 wxCHECK_RET( aSymbol, "Invalid LIB_SYMBOL pointer." );

 // The current locale must use period as the decimal point.
 wxCHECK2( wxLocale::GetInfo( wxLOCALE_DECIMAL_POINT, wxLOCALE_CAT_NUMBER ) == ".",
 LOCALE_IO toggle );

 int nextFreeFieldId = MANDATORY_FIELDS;
 std::vector<LIB_FIELD*> fields;
 std::string name = aFormatter.Quotew( aSymbol->GetLibId().GetLibItemName().wx_str() );
 std::string unitName = aSymbol->GetLibId().GetLibItemName();

 if( !aLibName.IsEmpty() )
 {
 name = aFormatter.Quotew( aLibName );

 LIB_ID unitId;

 wxCHECK2( unitId.Parse( aLibName ) < 0, /* do nothing */ );

 unitName = unitId.GetLibItemName();
 }

 if( aSymbol->IsRoot() )
 {
 aFormatter.Print( aNestLevel, "(symbol %s", name.c_str() );

 if( aSymbol->IsPower() )
 aFormatter.Print( 0, " (power)" );

 // TODO: add uuid token here.

 // TODO: add anchor position token here.

 if( !aSymbol->ShowPinNumbers() )
 aFormatter.Print( 0, " (pin_numbers hide)" );

 if( aSymbol->GetPinNameOffset() != Mils2iu( DEFAULT_PIN_NAME_OFFSET )
 || !aSymbol->ShowPinNames() )
 {
 aFormatter.Print( 0, " (pin_names" );

 if( aSymbol->GetPinNameOffset() != Mils2iu( DEFAULT_PIN_NAME_OFFSET ) )
 aFormatter.Print( 0, " (offset %s)",
 FormatInternalUnits( aSymbol->GetPinNameOffset() ).c_str() );

 if( !aSymbol->ShowPinNames() )
 aFormatter.Print( 0, " hide" );

 aFormatter.Print( 0, ")" );
 }

 aFormatter.Print( 0, " (in_bom %s)", ( aSymbol->GetIncludeInBom() ) ? "yes" : "no" );
 aFormatter.Print( 0, " (on_board %s)", ( aSymbol->GetIncludeOnBoard() ) ? "yes" : "no" );

 // TODO: add atomic token here.

 // TODO: add required token here."

 aFormatter.Print( 0, "\n" );

 aSymbol->GetFields( fields );

 for( LIB_FIELD* field : fields )
 saveField( field, aFormatter, aNestLevel + 1 );

 nextFreeFieldId = aSymbol->GetNextAvailableFieldId();

 // @todo At some point in the future the lock status (all units interchangeable) should
 // be set deterministically. For now a custom lock property is used to preserve the
 // locked flag state.
 if( aSymbol->UnitsLocked() )
 {
 LIB_FIELD locked( nextFreeFieldId, "ki_locked" );
 saveField( &locked, aFormatter, aNestLevel + 1 );
 nextFreeFieldId += 1;
 }

 saveDcmInfoAsFields( aSymbol, aFormatter, nextFreeFieldId, aNestLevel );

 // Save the draw items grouped by units.
 std::vector<LIB_SYMBOL_UNIT> units = aSymbol->GetUnitDrawItems();
 std::sort( units.begin(), units.end(),
 []( const LIB_SYMBOL_UNIT& a, const LIB_SYMBOL_UNIT& b )
 {
 if( a.m_unit == b.m_unit )
 return a.m_convert < b.m_convert;

 return a.m_unit < b.m_unit;
 } );

 for( auto unit : units )
 {
 // Add quotes and escape chars like ") to the UTF8 unitName string
 name = aFormatter.Quotes( unitName );
 name.pop_back(); // Remove last char: the quote ending the string.

 aFormatter.Print( aNestLevel + 1, "(symbol %s_%d_%d\"\n",
 name.c_str(), unit.m_unit, unit.m_convert );

 // Enforce item ordering
 auto cmp =
 []( const LIB_ITEM* a, const LIB_ITEM* b )
 {
 return *a < *b;
 };

 std::multiset<LIB_ITEM*, decltype( cmp )> save_map( cmp );

 for( LIB_ITEM* item : unit.m_items )
 save_map.insert( item );

 for( LIB_ITEM* item : save_map )
 saveSymbolDrawItem( item, aFormatter, aNestLevel + 2 );

 aFormatter.Print( aNestLevel + 1, ")\n" );
 }
 }
 else
 {
 std::shared_ptr<LIB_SYMBOL> parent = aSymbol->GetParent().lock();

 wxASSERT( parent );

 aFormatter.Print( aNestLevel, "(symbol %s (extends %s)\n",
 name.c_str(),
 aFormatter.Quotew( parent->GetName() ).c_str() );

 aSymbol->GetFields( fields );

 for( LIB_FIELD* field : fields )
 saveField( field, aFormatter, aNestLevel + 1 );

 nextFreeFieldId = aSymbol->GetNextAvailableFieldId();

 saveDcmInfoAsFields( aSymbol, aFormatter, nextFreeFieldId, aNestLevel );
 }

 aFormatter.Print( aNestLevel, ")\n" );
}


void SCH_SEXPR_PLUGIN_CACHE::saveDcmInfoAsFields( LIB_SYMBOL* aSymbol, OUTPUTFORMATTER& aFormatter,
 int& aNextFreeFieldId, int aNestLevel )
{
 wxCHECK_RET( aSymbol, "Invalid LIB_SYMBOL pointer." );

 if( !aSymbol->GetKeyWords().IsEmpty() )
 {
 LIB_FIELD keywords( aNextFreeFieldId, wxString( "ki_keywords" ) );
 keywords.SetVisible( false );
 keywords.SetText( aSymbol->GetKeyWords() );
 saveField( &keywords, aFormatter, aNestLevel + 1 );
 aNextFreeFieldId += 1;
 }

 if( !aSymbol->GetDescription().IsEmpty() )
 {
 LIB_FIELD description( aNextFreeFieldId, wxString( "ki_description" ) );
 description.SetVisible( false );
 description.SetText( aSymbol->GetDescription() );
 saveField( &description, aFormatter, aNestLevel + 1 );
 aNextFreeFieldId += 1;
 }

 wxArrayString fpFilters = aSymbol->GetFPFilters();

 if( !fpFilters.IsEmpty() )
 {
 wxString tmp;

 for( auto filter : fpFilters )
 {
 // Spaces are not handled in fp filter names so escape spaces if any
 wxString curr_filter = EscapeString( filter, ESCAPE_CONTEXT::CTX_NO_SPACE );

 if( tmp.IsEmpty() )
 tmp = curr_filter;
 else
 tmp += " " + curr_filter;
 }

 LIB_FIELD description( aNextFreeFieldId, wxString( "ki_fp_filters" ) );
 description.SetVisible( false );
 description.SetText( tmp );
 saveField( &description, aFormatter, aNestLevel + 1 );
 aNextFreeFieldId += 1;
 }
}


void SCH_SEXPR_PLUGIN_CACHE::saveSymbolDrawItem( LIB_ITEM* aItem, OUTPUTFORMATTER& aFormatter,
 int aNestLevel )
{
 wxCHECK_RET( aItem, "Invalid LIB_ITEM pointer." );

 switch( aItem->Type() )
 {
 case LIB_SHAPE_T:
 {
 LIB_SHAPE* shape = static_cast<LIB_SHAPE*>( aItem );
 STROKE_PARAMS stroke;
 FILL_T fillMode = shape->GetFillType();

 stroke.SetWidth( shape->GetWidth() );

 switch( shape->GetShape() )
 {
 case SHAPE_T::ARC:
 int x1;
 int x2;

 shape->CalcArcAngles( x1, x2 );

 formatArc( &aFormatter, aNestLevel, shape, x1, x2, stroke, fillMode, COLOR4D() );
 break;

 case SHAPE_T::CIRCLE:
 formatCircle( &aFormatter, aNestLevel, shape, stroke, fillMode, COLOR4D() );
 break;

 case SHAPE_T::RECT:
 formatRect( &aFormatter, aNestLevel, shape, stroke, fillMode, COLOR4D() );
 break;

 case SHAPE_T::BEZIER:
 formatBezier(&aFormatter, aNestLevel, shape, stroke, fillMode, COLOR4D() );
 break;

 case SHAPE_T::POLY:
 formatPoly( &aFormatter, aNestLevel, shape, stroke, fillMode, COLOR4D() );
 break;

 default:
 UNIMPLEMENTED_FOR( shape->SHAPE_T_asString() );
 }

 break;
 }

 case LIB_PIN_T:
 savePin( (LIB_PIN* ) aItem, aFormatter, aNestLevel );
 break;

 case LIB_TEXT_T:
 saveText( ( LIB_TEXT* ) aItem, aFormatter, aNestLevel );
 break;

 default:
 UNIMPLEMENTED_FOR( aItem->GetClass() );
 }
}


void SCH_SEXPR_PLUGIN_CACHE::saveField( LIB_FIELD* aField, OUTPUTFORMATTER& aFormatter,
 int aNestLevel )
{
 wxCHECK_RET( aField && aField->Type() == LIB_FIELD_T, "Invalid LIB_FIELD object." );

 wxString fieldName = aField->GetName();

 if( aField->GetId() >= 0 && aField->GetId() < MANDATORY_FIELDS )
 fieldName = TEMPLATE_FIELDNAME::GetDefaultFieldName( aField->GetId(), false );

 aFormatter.Print( aNestLevel, "(property %s %s (id %d) (at %s %s %g)\n",
 aFormatter.Quotew( fieldName ).c_str(),
 aFormatter.Quotew( aField->GetText() ).c_str(),
 aField->GetId(),
 FormatInternalUnits( aField->GetPosition().x ).c_str(),
 FormatInternalUnits( aField->GetPosition().y ).c_str(),
 static_cast<double>( aField->GetTextAngle() ) / 10.0 );

 aField->Format( &aFormatter, aNestLevel, 0 );
 aFormatter.Print( aNestLevel, ")\n" );
}


void SCH_SEXPR_PLUGIN_CACHE::savePin( LIB_PIN* aPin, OUTPUTFORMATTER& aFormatter, int aNestLevel )
{
 wxCHECK_RET( aPin && aPin->Type() == LIB_PIN_T, "Invalid LIB_PIN object." );

 aPin->ClearFlags( IS_CHANGED );

 aFormatter.Print( aNestLevel, "(pin %s %s (at %s %s %s) (length %s)",
 getPinElectricalTypeToken( aPin->GetType() ),
 getPinShapeToken( aPin->GetShape() ),
 FormatInternalUnits( aPin->GetPosition().x ).c_str(),
 FormatInternalUnits( aPin->GetPosition().y ).c_str(),
 FormatAngle( getPinAngle( aPin->GetOrientation() ) * 10.0 ).c_str(),
 FormatInternalUnits( aPin->GetLength() ).c_str() );

 if( !aPin->IsVisible() )
 aFormatter.Print( 0, " hide\n" );
 else
 aFormatter.Print( 0, "\n" );

 // This follows the EDA_TEXT effects formatting for future expansion.
 aFormatter.Print( aNestLevel + 1, "(name %s (effects (font (size %s %s))))\n",
 aFormatter.Quotew( aPin->GetName() ).c_str(),
 FormatInternalUnits( aPin->GetNameTextSize() ).c_str(),
 FormatInternalUnits( aPin->GetNameTextSize() ).c_str() );

 aFormatter.Print( aNestLevel + 1, "(number %s (effects (font (size %s %s))))\n",
 aFormatter.Quotew( aPin->GetNumber() ).c_str(),
 FormatInternalUnits( aPin->GetNumberTextSize() ).c_str(),
 FormatInternalUnits( aPin->GetNumberTextSize() ).c_str() );


 for( const std::pair<const wxString, LIB_PIN::ALT>& alt : aPin->GetAlternates() )
 {
 aFormatter.Print( aNestLevel + 1, "(alternate %s %s %s)\n",
 aFormatter.Quotew( alt.second.m_Name ).c_str(),
 getPinElectricalTypeToken( alt.second.m_Type ),
 getPinShapeToken( alt.second.m_Shape ) );
 }

 aFormatter.Print( aNestLevel, ")\n" );
}


void SCH_SEXPR_PLUGIN_CACHE::saveText( LIB_TEXT* aText, OUTPUTFORMATTER& aFormatter,
 int aNestLevel )
{
 wxCHECK_RET( aText && aText->Type() == LIB_TEXT_T, "Invalid LIB_TEXT object." );

 aFormatter.Print( aNestLevel, "(text %s (at %s %s %g)\n",
 aFormatter.Quotew( aText->GetText() ).c_str(),
 FormatInternalUnits( aText->GetPosition().x ).c_str(),
 FormatInternalUnits( aText->GetPosition().y ).c_str(),
 aText->GetTextAngle() );
 aText->Format( &aFormatter, aNestLevel, 0 );
 aFormatter.Print( aNestLevel, ")\n" );
}


void SCH_SEXPR_PLUGIN_CACHE::DeleteSymbol( const wxString& aSymbolName )
{
 LIB_SYMBOL_MAP::iterator it = m_symbols.find( aSymbolName );

 if( it == m_symbols.end() )
 THROW_IO_ERROR( wxString::Format( _( "library %s does not contain a symbol named %s" ),
 m_libFileName.GetFullName(), aSymbolName ) );

 LIB_SYMBOL* symbol = it->second;

 if( symbol->IsRoot() )
 {
 LIB_SYMBOL* rootSymbol = symbol;

 // Remove the root symbol and all its children.
 m_symbols.erase( it );

 LIB_SYMBOL_MAP::iterator it1 = m_symbols.begin();

 while( it1 != m_symbols.end() )
 {
 if( it1->second->IsAlias()
 && it1->second->GetParent().lock() == rootSymbol->SharedPtr() )
 {
 delete it1->second;
 it1 = m_symbols.erase( it1 );
 }
 else
 {
 it1++;
 }
 }

 delete rootSymbol;
 }
 else
 {
 // Just remove the alias.
 m_symbols.erase( it );
 delete symbol;
 }

 ++m_modHash;
 m_isModified = true;
}


void SCH_SEXPR_PLUGIN::cacheLib( const wxString& aLibraryFileName, const PROPERTIES* aProperties )
{
 if( !m_cache || !m_cache->IsFile( aLibraryFileName ) || m_cache->IsFileChanged() )
 {
 // a spectacular episode in memory management:
 delete m_cache;
 m_cache = new SCH_SEXPR_PLUGIN_CACHE( aLibraryFileName );

 // Because m_cache is rebuilt, increment SYMBOL_LIBS::s_modify_generation
 // to modify the hash value that indicate symbol to symbol links
 // must be updated.
 SYMBOL_LIBS::IncrementModifyGeneration();

 if( !isBuffering( aProperties ) )
 m_cache->Load();
 }
}


bool SCH_SEXPR_PLUGIN::isBuffering( const PROPERTIES* aProperties )
{
 return ( aProperties && aProperties->Exists( SCH_SEXPR_PLUGIN::PropBuffering ) );
}


int SCH_SEXPR_PLUGIN::GetModifyHash() const
{
 if( m_cache )
 return m_cache->GetModifyHash();

 // If the cache hasn't been loaded, it hasn't been modified.
 return 0;
}


void SCH_SEXPR_PLUGIN::EnumerateSymbolLib( wxArrayString& aSymbolNameList,
 const wxString& aLibraryPath,
 const PROPERTIES* aProperties )
{
 LOCALE_IO toggle; // toggles on, then off, the C locale.

 bool powerSymbolsOnly = ( aProperties &&
 aProperties->find( SYMBOL_LIB_TABLE::PropPowerSymsOnly ) != aProperties->end() );

 cacheLib( aLibraryPath, aProperties );

 const LIB_SYMBOL_MAP& symbols = m_cache->m_symbols;

 for( LIB_SYMBOL_MAP::const_iterator it = symbols.begin(); it != symbols.end(); ++it )
 {
 if( !powerSymbolsOnly || it->second->IsPower() )
 aSymbolNameList.Add( it->first );
 }
}


void SCH_SEXPR_PLUGIN::EnumerateSymbolLib( std::vector<LIB_SYMBOL*>& aSymbolList,
 const wxString& aLibraryPath,
 const PROPERTIES* aProperties )
{
 LOCALE_IO toggle; // toggles on, then off, the C locale.

 bool powerSymbolsOnly = ( aProperties &&
 aProperties->find( SYMBOL_LIB_TABLE::PropPowerSymsOnly ) != aProperties->end() );

 cacheLib( aLibraryPath, aProperties );

 const LIB_SYMBOL_MAP& symbols = m_cache->m_symbols;

 for( LIB_SYMBOL_MAP::const_iterator it = symbols.begin(); it != symbols.end(); ++it )
 {
 if( !powerSymbolsOnly || it->second->IsPower() )
 aSymbolList.push_back( it->second );
 }
}


LIB_SYMBOL* SCH_SEXPR_PLUGIN::LoadSymbol( const wxString& aLibraryPath, const wxString& aSymbolName,
 const PROPERTIES* aProperties )
{
 LOCALE_IO toggle; // toggles on, then off, the C locale.

 cacheLib( aLibraryPath, aProperties );

 LIB_SYMBOL_MAP::const_iterator it = m_cache->m_symbols.find( aSymbolName );

 if( it == m_cache->m_symbols.end() )
 return nullptr;

 return it->second;
}


void SCH_SEXPR_PLUGIN::SaveSymbol( const wxString& aLibraryPath, const LIB_SYMBOL* aSymbol,
 const PROPERTIES* aProperties )
{
 LOCALE_IO toggle; // toggles on, then off, the C locale.

 cacheLib( aLibraryPath, aProperties );

 m_cache->AddSymbol( aSymbol );

 if( !isBuffering( aProperties ) )
 m_cache->Save();
}


void SCH_SEXPR_PLUGIN::DeleteSymbol( const wxString& aLibraryPath, const wxString& aSymbolName,
 const PROPERTIES* aProperties )
{
 LOCALE_IO toggle; // toggles on, then off, the C locale.

 cacheLib( aLibraryPath, aProperties );

 m_cache->DeleteSymbol( aSymbolName );

 if( !isBuffering( aProperties ) )
 m_cache->Save();
}


void SCH_SEXPR_PLUGIN::CreateSymbolLib( const wxString& aLibraryPath,
 const PROPERTIES* aProperties )
{
 if( wxFileExists( aLibraryPath ) )
 {
 THROW_IO_ERROR( wxString::Format( _( "Symbol library '%s' already exists." ),
 aLibraryPath.GetData() ) );
 }

 LOCALE_IO toggle;

 delete m_cache;
 m_cache = new SCH_SEXPR_PLUGIN_CACHE( aLibraryPath );
 m_cache->SetModified();
 m_cache->Save();
 m_cache->Load(); // update m_writable and m_mod_time
}


bool SCH_SEXPR_PLUGIN::DeleteSymbolLib( const wxString& aLibraryPath,
 const PROPERTIES* aProperties )
{
 wxFileName fn = aLibraryPath;

 if( !fn.FileExists() )
 return false;

 // Some of the more elaborate wxRemoveFile() crap puts up its own wxLog dialog
 // we don't want that. we want bare metal portability with no UI here.
 if( wxRemove( aLibraryPath ) )
 {
 THROW_IO_ERROR( wxString::Format( _( "Symbol library '%s' cannot be deleted." ),
 aLibraryPath.GetData() ) );
 }

 if( m_cache && m_cache->IsFile( aLibraryPath ) )
 {
 delete m_cache;
 m_cache = nullptr;
 }

 return true;
}


void SCH_SEXPR_PLUGIN::SaveLibrary( const wxString& aLibraryPath, const PROPERTIES* aProperties )
{
 if( !m_cache )
 m_cache = new SCH_SEXPR_PLUGIN_CACHE( aLibraryPath );

 wxString oldFileName = m_cache->GetFileName();

 if( !m_cache->IsFile( aLibraryPath ) )
 {
 m_cache->SetFileName( aLibraryPath );
 }

 // This is a forced save.
 m_cache->SetModified();
 m_cache->Save();
 m_cache->SetFileName( oldFileName );
}


bool SCH_SEXPR_PLUGIN::CheckHeader( const wxString& aFileName )
{
 // Open file and check first line
 wxTextFile tempFile;

 tempFile.Open( aFileName );
 wxString firstline;
 // read the first line
 firstline = tempFile.GetFirstLine();
 tempFile.Close();

 return firstline.StartsWith( "EESchema" );
}


bool SCH_SEXPR_PLUGIN::IsSymbolLibWritable( const wxString& aLibraryPath )
{
 wxFileName fn( aLibraryPath );

 return ( fn.FileExists() && fn.IsFileWritable() ) || fn.IsDirWritable();
}


LIB_SYMBOL* SCH_SEXPR_PLUGIN::ParseLibSymbol( LINE_READER& aReader, int aFileVersion )
{
 LOCALE_IO toggle; // toggles on, then off, the C locale.
 LIB_SYMBOL_MAP map;
 SCH_SEXPR_PARSER parser( &aReader );

 parser.NeedLEFT();
 parser.NextTok();

 return parser.ParseSymbol( map, aFileVersion );
}


void SCH_SEXPR_PLUGIN::FormatLibSymbol( LIB_SYMBOL* symbol, OUTPUTFORMATTER & formatter )
{

 LOCALE_IO toggle; // toggles on, then off, the C locale.
 SCH_SEXPR_PLUGIN_CACHE::SaveSymbol( symbol, formatter );
}


const char* SCH_SEXPR_PLUGIN::PropBuffering = "buffering";