sch_reference_list.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 1992-2018 jean-pierre Charras <jp.charras at wanadoo.fr>
 * Copyright (C) 1992-2011 Wayne Stambaugh <[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 <sch_reference_list.h>
#include <core/kicad_algo.h>
 
#include <wx/regex.h>
#include <algorithm>
#include <vector>
#include <unordered_set>
 
#include <string_utils.h>
#include <erc_settings.h>
#include <sch_symbol.h>
#include <sch_edit_frame.h>
 
 
void SCH_REFERENCE_LIST::RemoveItem( unsigned int aIndex )
{
 if( aIndex < m_flatList.size() )
 m_flatList.erase( m_flatList.begin() + aIndex );
}
 
 
bool SCH_REFERENCE_LIST::Contains( const SCH_REFERENCE& aItem ) const
{
 for( unsigned ii = 0; ii < GetCount(); ii++ )
 {
 if( m_flatList[ii].IsSameInstance( aItem ) )
 return true;
 }
 
 return false;
}
 
 
bool SCH_REFERENCE_LIST::sortByXPosition( const SCH_REFERENCE& item1, const SCH_REFERENCE& item2 )
{
 int ii = item1.CompareRef( item2 );
 
 if( ii == 0 )
 ii = item1.m_sheetNum - item2.m_sheetNum;
 
 if( ii == 0 )
 ii = item1.m_symbolPos.x - item2.m_symbolPos.x;
 
 if( ii == 0 )
 ii = item1.m_symbolPos.y - item2.m_symbolPos.y;
 
 if( ii == 0 )
 return item1.m_symbolUuid < item2.m_symbolUuid; // ensure a deterministic sort
 else
 return ii < 0;
}
 
 
bool SCH_REFERENCE_LIST::sortByYPosition( const SCH_REFERENCE& item1, const SCH_REFERENCE& item2 )
{
 int ii = item1.CompareRef( item2 );
 
 if( ii == 0 )
 ii = item1.m_sheetNum - item2.m_sheetNum;
 
 if( ii == 0 )
 ii = item1.m_symbolPos.y - item2.m_symbolPos.y;
 
 if( ii == 0 )
 ii = item1.m_symbolPos.x - item2.m_symbolPos.x;
 
 if( ii == 0 )
 return item1.m_symbolUuid < item2.m_symbolUuid; // ensure a deterministic sort
 else
 return ii < 0;
}
 
 
bool SCH_REFERENCE_LIST::sortByRefAndValue( const SCH_REFERENCE& item1,
 const SCH_REFERENCE& item2 )
{
 int ii = item1.CompareRef( item2 );
 
 if( ii == 0 )
 ii = item1.CompareValue( item2 );
 
 if( ii == 0 )
 ii = item1.m_unit - item2.m_unit;
 
 if( ii == 0 )
 ii = item1.m_sheetNum - item2.m_sheetNum;
 
 if( ii == 0 )
 ii = item1.m_symbolPos.x - item2.m_symbolPos.x;
 
 if( ii == 0 )
 ii = item1.m_symbolPos.y - item2.m_symbolPos.y;
 
 if( ii == 0 )
 return item1.m_symbolUuid < item2.m_symbolUuid; // ensure a deterministic sort
 else
 return ii < 0;
}
 
 
bool SCH_REFERENCE_LIST::sortByReferenceOnly( const SCH_REFERENCE& item1,
 const SCH_REFERENCE& item2 )
{
 int ii = StrNumCmp( item1.GetRef(), item2.GetRef(), false );
 
 if( ii == 0 )
 ii = item1.m_unit - item2.m_unit;
 
 if( ii == 0 )
 return item1.m_symbolUuid < item2.m_symbolUuid; // ensure a deterministic sort
 else
 return ii < 0;
}
 
 
bool SCH_REFERENCE_LIST::sortByTimeStamp( const SCH_REFERENCE& item1,
 const SCH_REFERENCE& item2 )
{
 int ii = item1.m_sheetPath.Cmp( item2.m_sheetPath );
 
 if( ii == 0 )
 return item1.m_symbolUuid < item2.m_symbolUuid; // ensure a deterministic sort
 else
 return ii < 0;
}
 
 
int SCH_REFERENCE_LIST::FindUnit( size_t aIndex, int aUnit, bool aIncludeNew ) const
{
 int NumRef = m_flatList[aIndex].m_numRef;
 
 for( size_t ii = 0; ii < m_flatList.size(); ii++ )
 {
 if( ( aIndex == ii )
 || ( m_flatList[ii].m_isNew && !aIncludeNew )
 || ( m_flatList[ii].m_numRef != NumRef )
 || ( m_flatList[aIndex].CompareRef( m_flatList[ii] ) != 0 ) )
 continue;
 
 if( m_flatList[ii].m_unit == aUnit )
 return (int) ii;
 }
 
 return -1;
}
 
 
int SCH_REFERENCE_LIST::FindRefByFullPath( const wxString& aFullPath ) const
{
 for( size_t i = 0; i < m_flatList.size(); ++i )
 {
 if( m_flatList[i].GetFullPath() == aFullPath )
 return i;
 }
 
 return -1;
}
 
 
int SCH_REFERENCE_LIST::FindRef( const wxString& aRef ) const
{
 for( size_t i = 0; i < m_flatList.size(); ++i )
 {
 if( m_flatList[i].GetRef() == aRef )
 return i;
 }
 
 return -1;
}
 
 
void SCH_REFERENCE_LIST::GetRefsInUse( int aIndex, std::vector< int >& aIdList,
 int aMinRefId ) const
{
 aIdList.clear();
 
 for( const SCH_REFERENCE& ref : m_flatList )
 {
 // Don't add new references to the list as we will reannotate those
 if( m_flatList[aIndex].CompareRef( ref ) == 0 && ref.m_numRef >= aMinRefId && !ref.m_isNew )
 aIdList.push_back( ref.m_numRef );
 }
 
 std::sort( aIdList.begin(), aIdList.end() );
 
 // Ensure each reference number appears only once. If there are symbols with
 // multiple parts per package the same number will be stored for each part.
 alg::remove_duplicates( aIdList );
}
 
 
std::vector<int> SCH_REFERENCE_LIST::GetUnitsMatchingRef( const SCH_REFERENCE& aRef ) const
{
 std::vector<int> unitsList;
 
 // Always add this reference to the list
 unitsList.push_back( aRef.m_unit );
 
 for( SCH_REFERENCE ref : m_flatList )
 {
 if( ref.CompareValue( aRef ) != 0 )
 continue;
 
 if( ref.CompareLibName( aRef ) != 0 )
 continue;
 
 // Split if needed before comparing ref and number
 if( ref.IsSplitNeeded() )
 ref.Split();
 
 if( ref.CompareRef( aRef ) != 0 )
 continue;
 
 if( ref.m_numRef != aRef.m_numRef )
 continue;
 
 unitsList.push_back( ref.m_unit );
 }
 
 std::sort( unitsList.begin(), unitsList.end() );
 
 // Ensure each reference number appears only once. If there are symbols with
 // multiple parts per package the same number will be stored for each part.
 alg::remove_duplicates( unitsList );
 
 return unitsList;
}
 
 
int SCH_REFERENCE_LIST::FindFirstUnusedReference( const SCH_REFERENCE& aRef, int aMinValue,
 const std::vector<int>& aRequiredUnits ) const
{
 // Create a map of references indexed by reference number, only including those with the same
 // reference prefix as aRef
 std::map<int, std::vector<SCH_REFERENCE>> refNumberMap;
 
 for( const SCH_REFERENCE& ref : m_flatList )
 {
 // search only for the current reference prefix:
 if( ref.CompareRef( aRef ) != 0 )
 continue;
 
 if( ref.m_isNew )
 continue; // It will be reannotated
 
 refNumberMap[ref.m_numRef].push_back( ref );
 }
 
 // Start at the given minimum value
 int minFreeNumber = aMinValue;
 
 for( ; refNumberMap[minFreeNumber].size() > 0; ++minFreeNumber )
 {
 auto isNumberInUse = [&]() -> bool
 {
 for( const int& unit : aRequiredUnits )
 {
 for( const SCH_REFERENCE& ref : refNumberMap[minFreeNumber] )
 {
 if( ref.CompareLibName( aRef ) || ref.CompareValue( aRef )
 || ref.GetUnit() == unit )
 {
 return true;
 }
 }
 }
 
 return false;
 };
 
 if( !isNumberInUse() )
 return minFreeNumber;
 }
 
 return minFreeNumber;
}
 
 
std::vector<SCH_SYMBOL_INSTANCE> SCH_REFERENCE_LIST::GetSymbolInstances() const
{
 std::vector<SCH_SYMBOL_INSTANCE> retval;
 
 for( const SCH_REFERENCE& ref : m_flatList )
 {
 SCH_SYMBOL_INSTANCE instance;
 instance.m_Path = ref.GetSheetPath().Path();
 instance.m_Reference = ref.GetRef();
 instance.m_Unit = ref.GetUnit();
 
 retval.push_back( instance );
 }
 
 return retval;
}
 
 
int SCH_REFERENCE_LIST::createFirstFreeRefId( std::vector<int>& aIdList, int aFirstValue )
{
 int expectedId = aFirstValue;
 
 // We search for expected Id a value >= aFirstValue.
 // Skip existing Id < aFirstValue
 unsigned ii = 0;
 
 for( ; ii < aIdList.size(); ii++ )
 {
 if( expectedId <= aIdList[ii] )
 break;
 }
 
 // Ids are sorted by increasing value, from aFirstValue
 // So we search from aFirstValue the first not used value, i.e. the first hole in list.
 for( ; ii < aIdList.size(); ii++ )
 {
 if( expectedId != aIdList[ii] ) // This id is not yet used.
 {
 // Insert this free Id, in order to keep list sorted
 aIdList.insert( aIdList.begin() + ii, expectedId );
 return expectedId;
 }
 
 expectedId++;
 }
 
 // All existing Id are tested, and all values are found in use.
 // So Create a new one.
 aIdList.push_back( expectedId );
 return expectedId;
}
 
 
// A helper function to build a full reference string of a SCH_REFERENCE item
wxString buildFullReference( const SCH_REFERENCE& aItem, int aUnitNumber = -1 )
{
 wxString fullref;
 fullref = aItem.GetRef() + aItem.GetRefNumber();
 
 if( aUnitNumber < 0 )
 fullref << ".." << aItem.GetUnit();
 else
 fullref << ".." << aUnitNumber;
 
 return fullref;
}
 
 
void SCH_REFERENCE_LIST::ReannotateByOptions( ANNOTATE_ORDER_T aSortOption,
 ANNOTATE_ALGO_T aAlgoOption,
 int aStartNumber,
 const SCH_REFERENCE_LIST& aAdditionalRefs,
 bool aStartAtCurrent,
 SCH_SHEET_LIST* aHierarchy )
{
 SplitReferences();
 
 // All multi-unit symbols always locked to ensure consistent re-annotation
 SCH_MULTI_UNIT_REFERENCE_MAP lockedSymbols;
 
 for( size_t i = 0; i < GetCount(); i++ )
 {
 SCH_REFERENCE& ref = m_flatList[i];
 wxString refstr = ref.GetSymbol()->GetRef( &ref.GetSheetPath() );
 
 // Update sheet numbers based on the reference's sheet's position within the full
 // hierarchy; we do this now before we annotate so annotation by sheet number * X
 // works correctly.
 if( aHierarchy )
 {
 SCH_SHEET_PATH* path = aHierarchy->FindSheetForPath( &ref.GetSheetPath() );
 wxASSERT_MSG( path, wxT( "Attempting to annotate item on sheet not part of the hierarchy?" ) );
 
 ref.SetSheetNumber( path->GetVirtualPageNumber() );
 }
 
 // Never lock unassigned references
 if( refstr[refstr.Len() - 1] == '?' )
 continue;
 
 ref.m_isNew = true; // We want to reannotate all references
 
 lockedSymbols[refstr].AddItem( ref );
 }
 
 AnnotateByOptions( aSortOption, aAlgoOption, aStartNumber, lockedSymbols, aAdditionalRefs,
 aStartAtCurrent );
}
 
 
void SCH_REFERENCE_LIST::ReannotateDuplicates( const SCH_REFERENCE_LIST& aAdditionalReferences )
{
 ReannotateByOptions( UNSORTED, INCREMENTAL_BY_REF, 0, aAdditionalReferences, true, nullptr );
}
 
 
void SCH_REFERENCE_LIST::AnnotateByOptions( ANNOTATE_ORDER_T aSortOption,
 ANNOTATE_ALGO_T aAlgoOption,
 int aStartNumber,
 SCH_MULTI_UNIT_REFERENCE_MAP aLockedUnitMap,
 const SCH_REFERENCE_LIST& aAdditionalRefs,
 bool aStartAtCurrent )
{
 switch( aSortOption )
 {
 default:
 case SORT_BY_X_POSITION: SortByXCoordinate(); break;
 case SORT_BY_Y_POSITION: SortByYCoordinate(); break;
 }
 
 bool useSheetNum;
 int idStep;
 
 switch( aAlgoOption )
 {
 default:
 case INCREMENTAL_BY_REF:
 useSheetNum = false;
 idStep = 1;
 break;
 
 case SHEET_NUMBER_X_100:
 useSheetNum = true;
 idStep = 100;
 aStartAtCurrent = false; // Not implemented for sheet # * 100
 break;
 
 case SHEET_NUMBER_X_1000:
 useSheetNum = true;
 idStep = 1000;
 aStartAtCurrent = false; // Not implemented for sheet # * 1000
 break;
 }
 
 Annotate( useSheetNum, idStep, aStartNumber, aLockedUnitMap, aAdditionalRefs, aStartAtCurrent );
}
 
 
void SCH_REFERENCE_LIST::Annotate( bool aUseSheetNum, int aSheetIntervalId, int aStartNumber,
 SCH_MULTI_UNIT_REFERENCE_MAP aLockedUnitMap,
 const SCH_REFERENCE_LIST& aAdditionalRefs, bool aStartAtCurrent )
{
 if ( m_flatList.size() == 0 )
 return;
 
 size_t originalSize = GetCount();
 
 // For multi units symbols, store the list of already used full references.
 // The algorithm tries to allocate the new reference to symbols having the same
 // old reference.
 // This algo works fine as long as the previous annotation has no duplicates.
 // But when a hierarchy is reannotated with this option, the previous annotation can
 // have duplicate references, and obviously we must fix these duplicate.
 // therefore do not try to allocate a full reference more than once when trying
 // to keep this order of multi units.
 // inUseRefs keep trace of previously allocated references
 std::unordered_set<wxString> inUseRefs;
 
 for( size_t i = 0; i < aAdditionalRefs.GetCount(); i++ )
 {
 SCH_REFERENCE additionalRef = aAdditionalRefs[i];
 additionalRef.Split();
 
 // Add the additional reference to the multi-unit set if annotated
 if( !additionalRef.m_isNew )
 inUseRefs.insert( buildFullReference( additionalRef ) );
 
 // We don't want to reannotate the additional references even if not annotated
 // so we change the m_isNew flag to be false after splitting
 additionalRef.m_isNew = false;
 AddItem( additionalRef ); //add to this container
 }
 
 int LastReferenceNumber = 0;
 
 /* calculate index of the first symbol with the same reference prefix
 * than the current symbol. All symbols having the same reference
 * prefix will receive a reference number with consecutive values:
 * IC .. will be set to IC4, IC4, IC5 ...
 */
 unsigned first = 0;
 
 // calculate the last used number for this reference prefix:
 int minRefId;
 
 // when using sheet number, ensure ref number >= sheet number* aSheetIntervalId
 if( aUseSheetNum )
 minRefId = m_flatList[first].m_sheetNum * aSheetIntervalId + 1;
 else
 minRefId = aStartNumber + 1;
 
 
 for( unsigned ii = 0; ii < m_flatList.size(); ii++ )
 {
 auto& ref_unit = m_flatList[ii];
 
 if( ref_unit.m_flag )
 continue;
 
 // Check whether this symbol is in aLockedUnitMap.
 SCH_REFERENCE_LIST* lockedList = nullptr;
 
 for( SCH_MULTI_UNIT_REFERENCE_MAP::value_type& pair : aLockedUnitMap )
 {
 unsigned n_refs = pair.second.GetCount();
 
 for( unsigned thisRefI = 0; thisRefI < n_refs; ++thisRefI )
 {
 SCH_REFERENCE &thisRef = pair.second[thisRefI];
 
 if( thisRef.IsSameInstance( ref_unit ) )
 {
 lockedList = &pair.second;
 break;
 }
 }
 
 if( lockedList != nullptr )
 break;
 }
 
 if( ( m_flatList[first].CompareRef( ref_unit ) != 0 )
 || ( aUseSheetNum && ( m_flatList[first].m_sheetNum != ref_unit.m_sheetNum ) ) )
 {
 // New reference found: we need a new ref number for this reference
 first = ii;
 
 // when using sheet number, ensure ref number >= sheet number* aSheetIntervalId
 if( aUseSheetNum )
 minRefId = ref_unit.m_sheetNum * aSheetIntervalId + 1;
 else
 minRefId = aStartNumber + 1;
 }
 
 // Find references greater than current reference (unless not annotated)
 if( aStartAtCurrent && ref_unit.m_numRef > 0 )
 minRefId = ref_unit.m_numRef;
 
 // Annotation of one part per package symbols (trivial case).
 if( ref_unit.GetLibPart()->GetUnitCount() <= 1 )
 {
 if( ref_unit.m_isNew )
 {
 std::vector<int> idList;
 GetRefsInUse( first, idList, minRefId );
 LastReferenceNumber = createFirstFreeRefId( idList, minRefId );
 ref_unit.m_numRef = LastReferenceNumber;
 }
 
 ref_unit.m_flag = 1;
 ref_unit.m_isNew = false;
 continue;
 }
 
 // If this symbol is in aLockedUnitMap, copy the annotation to all
 // symbols that are not it
 if( lockedList != nullptr )
 {
 unsigned n_refs = lockedList->GetCount();
 std::vector<int> units = lockedList->GetUnitsMatchingRef( ref_unit );
 
 if( ref_unit.m_isNew )
 {
 LastReferenceNumber = FindFirstUnusedReference( ref_unit, minRefId, units );
 ref_unit.m_numRef = LastReferenceNumber;
 ref_unit.m_isNew = false;
 ref_unit.m_flag = 1;
 }
 
 for( unsigned lockedRefI = 0; lockedRefI < n_refs; ++lockedRefI )
 {
 SCH_REFERENCE& lockedRef = ( *lockedList )[lockedRefI];
 
 if( lockedRef.IsSameInstance( ref_unit ) )
 {
 // This is the symbol we're currently annotating. Hold the unit!
 ref_unit.m_unit = lockedRef.m_unit;
 
 // lock this new full reference
 inUseRefs.insert( buildFullReference( ref_unit ) );
 }
 
 if( lockedRef.CompareValue( ref_unit ) != 0 )
 continue;
 
 if( lockedRef.CompareLibName( ref_unit ) != 0 )
 continue;
 
 // Find the matching symbol
 for( unsigned jj = ii + 1; jj < m_flatList.size(); jj++ )
 {
 if( !lockedRef.IsSameInstance( m_flatList[jj] ) )
 continue;
 
 wxString ref_candidate = buildFullReference( ref_unit, lockedRef.m_unit );
 
 // propagate the new reference and unit selection to the "old" symbol,
 // if this new full reference is not already used (can happens when initial
 // multiunits symbols have duplicate references)
 if( inUseRefs.find( ref_candidate ) == inUseRefs.end() )
 {
 m_flatList[jj].m_numRef = ref_unit.m_numRef;
 m_flatList[jj].m_isNew = false;
 m_flatList[jj].m_flag = 1;
 
 // lock this new full reference
 inUseRefs.insert( ref_candidate );
 break;
 }
 }
 }
 }
 else if( ref_unit.m_isNew )
 {
 // Reference belonging to multi-unit symbol that has not yet been annotated. We don't
 // know what group this might belong to, so just find the first unused reference for
 // this specific unit. The other units will be annotated in the following passes.
 std::vector<int> units = { ref_unit.GetUnit() };
 LastReferenceNumber = FindFirstUnusedReference( ref_unit, minRefId, units );
 ref_unit.m_numRef = LastReferenceNumber;
 ref_unit.m_isNew = false;
 ref_unit.m_flag = 1;
 }
 }
 
 // Remove aAdditionalRefs references
 for( size_t i = originalSize; i < ( aAdditionalRefs.GetCount() + originalSize ); i++ )
 RemoveItem( originalSize );
 
 wxASSERT( originalSize == GetCount() ); // Make sure we didn't make a mistake
}
 
 
int SCH_REFERENCE_LIST::CheckAnnotation( ANNOTATION_ERROR_HANDLER aHandler )
{
 int error = 0;
 wxString tmp;
 wxString tmp2;
 wxString msg;
 
 SortByRefAndValue();
 
 // Split reference designators into name (prefix) and number: IC1 becomes IC, and 1.
 SplitReferences();
 
 // count not yet annotated items or annotation error.
 for( unsigned ii = 0; ii < m_flatList.size(); ii++ )
 {
 msg.Empty();
 tmp.Empty();
 
 if( m_flatList[ii].m_isNew ) // Not yet annotated
 {
 if( m_flatList[ii].m_numRef >= 0 )
 tmp << m_flatList[ii].m_numRef;
 else
 tmp = wxT( "?" );
 
 if( ( m_flatList[ii].m_unit > 0 ) && ( m_flatList[ii].m_unit < 0x7FFFFFFF )
 && m_flatList[ii].GetLibPart()->GetUnitCount() > 1 )
 {
 msg.Printf( _( "Item not annotated: %s%s (unit %d)" ),
 m_flatList[ii].GetRef(),
 tmp,
 m_flatList[ii].m_unit );
 }
 else
 {
 msg.Printf( _( "Item not annotated: %s%s" ), m_flatList[ii].GetRef(), tmp );
 }
 
 aHandler( ERCE_UNANNOTATED, msg, &m_flatList[ii], nullptr );
 error++;
 break;
 }
 
 // Error if unit number selected does not exist (greater than the number of units in
 // the symbol). This can happen if a symbol has changed in a library after a
 // previous annotation.
 if( std::max( m_flatList[ii].GetLibPart()->GetUnitCount(), 1 ) < m_flatList[ii].m_unit )
 {
 if( m_flatList[ii].m_numRef >= 0 )
 tmp << m_flatList[ii].m_numRef;
 else
 tmp = wxT( "?" );
 
 msg.Printf( _( "Error: symbol %s%s%s (unit %d) exceeds units defined (%d)" ),
 m_flatList[ii].GetRef(),
 tmp,
 LIB_SYMBOL::SubReference( m_flatList[ii].m_unit ),
 m_flatList[ii].m_unit,
 m_flatList[ii].GetLibPart()->GetUnitCount() );
 
 aHandler( ERCE_EXTRA_UNITS, msg, &m_flatList[ii], nullptr );
 error++;
 break;
 }
 }
 
 // count the duplicated elements (if all are annotated)
 int imax = m_flatList.size() - 1;
 
 for( int ii = 0; ii < imax; ii++ )
 {
 msg.Empty();
 tmp.Empty();
 tmp2.Empty();
 
 SCH_REFERENCE& first = m_flatList[ii];
 SCH_REFERENCE& second = m_flatList[ii + 1];
 
 if( ( first.CompareRef( second ) != 0 )
 || ( first.m_numRef != second.m_numRef ) )
 {
 continue;
 }
 
 // Same reference found. If same unit, error!
 if( first.m_unit == second.m_unit )
 {
 if( first.m_numRef >= 0 )
 tmp << first.m_numRef;
 else
 tmp = wxT( "?" );
 
 msg.Printf( _( "Duplicate items %s%s%s\n" ),
 first.GetRef(),
 tmp,
 first.GetLibPart()->GetUnitCount() > 1 ?
 LIB_SYMBOL::SubReference( first.m_unit ) : wxString( wxT( "" ) ) );
 
 aHandler( ERCE_DUPLICATE_REFERENCE, msg, &first, &m_flatList[ii+1] );
 error++;
 continue;
 }
 
 /* Test error if units are different but number of parts per package
 * too high (ex U3 ( 1 part) and we find U3B this is an error) */
 if( first.GetLibPart()->GetUnitCount() != second.GetLibPart()->GetUnitCount() )
 {
 if( first.m_numRef >= 0 )
 tmp << first.m_numRef;
 else
 tmp = wxT( "?" );
 
 if( second.m_numRef >= 0 )
 tmp2 << second.m_numRef;
 else
 tmp2 = wxT( "?" );
 
 msg.Printf( _( "Differing unit counts for item %s%s%s and %s%s%s\n" ),
 first.GetRef(),
 tmp,
 LIB_SYMBOL::SubReference( first.m_unit ),
 second.GetRef(),
 tmp2,
 LIB_SYMBOL::SubReference( second.m_unit ) );
 
 aHandler( ERCE_DUPLICATE_REFERENCE, msg, &first, &second );
 error++;
 continue;
 }
 
 // Error if values are different between units, for the same reference
 if( first.CompareValue( second ) != 0 )
 {
 msg.Printf( _( "Different values for %s%d%s (%s) and %s%d%s (%s)" ),
 first.GetRef(),
 first.m_numRef,
 LIB_SYMBOL::SubReference( first.m_unit ),
 first.m_value,
 second.GetRef(),
 second.m_numRef,
 LIB_SYMBOL::SubReference( second.m_unit ),
 second.m_value );
 
 aHandler( ERCE_DIFFERENT_UNIT_VALUE, msg, &first, &second );
 error++;
 }
 }
 
 return error;
}
 
 
SCH_REFERENCE::SCH_REFERENCE( SCH_SYMBOL* aSymbol, LIB_SYMBOL* aLibSymbol,
 const SCH_SHEET_PATH& aSheetPath )
{
 wxASSERT( aSymbol != nullptr );
 
 m_rootSymbol = aSymbol;
 m_libPart = aLibSymbol; // Warning: can be nullptr for orphan symbols
 // (i.e. with a symbol library not found)
 m_unit = aSymbol->GetUnitSelection( &aSheetPath );
 m_footprint = aSymbol->GetFootprintFieldText( true );
 m_sheetPath = aSheetPath;
 m_isNew = false;
 m_flag = 0;
 m_symbolUuid = aSymbol->m_Uuid;
 m_symbolPos = aSymbol->GetPosition();
 m_sheetNum = 0;
 
 if( aSymbol->GetRef( &aSheetPath ).IsEmpty() )
 aSymbol->SetRef( &aSheetPath, wxT( "DefRef?" ) );
 
 wxString ref = aSymbol->GetRef( &aSheetPath );
 SetRef( ref );
 
 m_numRef = -1;
 
 if( aSymbol->GetValueFieldText( false ).IsEmpty() )
 aSymbol->SetValueFieldText( wxT( "~" ) );
 
 m_value = aSymbol->GetValueFieldText( false );
}
 
 
void SCH_REFERENCE::Annotate()
{
 if( m_numRef < 0 )
 m_ref += '?';
 else
 m_ref = TO_UTF8( GetRef() << GetRefNumber() );
 
 m_rootSymbol->SetRef( &m_sheetPath, FROM_UTF8( m_ref.c_str() ) );
 m_rootSymbol->SetUnit( m_unit );
 m_rootSymbol->SetUnitSelection( &m_sheetPath, m_unit );
}
 
 
bool SCH_REFERENCE::AlwaysAnnotate() const
{
 wxCHECK( m_rootSymbol && m_rootSymbol->GetLibSymbolRef()
 && !m_rootSymbol->GetRef( &m_sheetPath ).IsEmpty(), false );
 
 return m_rootSymbol->GetLibSymbolRef()->IsPower()
 || m_rootSymbol->GetRef( &m_sheetPath )[0] == wxUniChar( '#' );
}
 
 
void SCH_REFERENCE::Split()
{
 std::string refText = GetRefStr();
 
 m_numRef = -1;
 
 int ll = refText.length() - 1;
 
 if( refText[ll] == '?' )
 {
 m_isNew = true;
 
 refText.erase( ll ); // delete last char
 
 SetRefStr( refText );
 }
 else if( isdigit( refText[ll] ) == 0 )
 {
 m_isNew = true;
 }
 else
 {
 while( ll >= 0 )
 {
 if( (refText[ll] <= ' ' ) || isdigit( refText[ll] ) )
 ll--;
 else
 {
 if( isdigit( refText[ll + 1] ) )
 {
 // null terminated C string into cp
 const char* cp = refText.c_str() + ll + 1;
 
 m_numRef = atoi( cp );
 }
 
 refText.erase( ll+1 ); // delete from ll+1 to end
 break;
 }
 }
 
 SetRefStr( refText );
 }
}
 
 
bool SCH_REFERENCE::IsSplitNeeded()
{
 std::string refText = GetRefStr();
 
 int ll = refText.length() - 1;
 
 return ( refText[ll] == '?' ) || isdigit( refText[ll] );
}
 
 
wxString SCH_REFERENCE_LIST::Shorthand( std::vector<SCH_REFERENCE> aList )
{
 wxString retVal;
 size_t i = 0;
 
 while( i < aList.size() )
 {
 wxString ref = aList[ i ].GetRef();
 int numRef = aList[ i ].m_numRef;
 
 size_t range = 1;
 
 while( i + range < aList.size()
 && aList[ i + range ].GetRef() == ref
 && aList[ i + range ].m_numRef == int( numRef + range ) )
 {
 range++;
 }
 
 if( !retVal.IsEmpty() )
 retVal << wxT( ", " );
 
 if( range == 1 )
 {
 retVal << ref << aList[ i ].GetRefNumber();
 }
 else if( range == 2 )
 {
 retVal << ref << aList[ i ].GetRefNumber();
 retVal << wxT( ", " );
 retVal << ref << aList[ i + 1 ].GetRefNumber();
 }
 else
 {
 retVal << ref << aList[ i ].GetRefNumber();
 retVal << wxT( "-" );
 retVal << ref << aList[ i + ( range - 1 ) ].GetRefNumber();
 }
 
 i+= range;
 }
 
 return retVal;
}