drc_engine.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2004-2019 Jean-Pierre Charras, jp.charras at wanadoo.fr
 * Copyright (C) 2014 Dick Hollenbeck, [email protected]
 * Copyright (C) 2017-2024 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 <atomic>
#include <reporter.h>
#include <progress_reporter.h>
#include <string_utils.h>
#include <board_design_settings.h>
#include <drc/drc_engine.h>
#include <drc/drc_rtree.h>
#include <drc/drc_rule_parser.h>
#include <drc/drc_rule.h>
#include <drc/drc_rule_condition.h>
#include <drc/drc_test_provider.h>
#include <drc/drc_item.h>
#include <drc/drc_cache_generator.h>
#include <footprint.h>
#include <pad.h>
#include <pcb_track.h>
#include <core/thread_pool.h>
#include <zone.h>
 
 
// wxListBox's performance degrades horrifically with very large datasets. It's not clear
// they're useful to the user anyway.
#define ERROR_LIMIT 199
#define EXTENDED_ERROR_LIMIT 499
 
 
void drcPrintDebugMessage( int level, const wxString& msg, const char *function, int line )
{
 wxString valueStr;
 
 if( wxGetEnv( wxT( "DRC_DEBUG" ), &valueStr ) )
 {
 int setLevel = wxAtoi( valueStr );
 
 if( level <= setLevel )
 printf( "%-30s:%d | %s\n", function, line, (const char *) msg.c_str() );
 }
}
 
 
DRC_ENGINE::DRC_ENGINE( BOARD* aBoard, BOARD_DESIGN_SETTINGS *aSettings ) :
 UNITS_PROVIDER( pcbIUScale, EDA_UNITS::MILLIMETRES ),
 m_designSettings ( aSettings ),
 m_board( aBoard ),
 m_drawingSheet( nullptr ),
 m_schematicNetlist( nullptr ),
 m_rulesValid( false ),
 m_reportAllTrackErrors( false ),
 m_testFootprints( false ),
 m_reporter( nullptr ),
 m_progressReporter( nullptr )
{
 m_errorLimits.resize( DRCE_LAST + 1 );
 
 for( int ii = DRCE_FIRST; ii <= DRCE_LAST; ++ii )
 m_errorLimits[ ii ] = ERROR_LIMIT;
}
 
 
DRC_ENGINE::~DRC_ENGINE()
{
 m_rules.clear();
 
 for( std::pair<DRC_CONSTRAINT_T, std::vector<DRC_ENGINE_CONSTRAINT*>*> pair : m_constraintMap )
 {
 for( DRC_ENGINE_CONSTRAINT* constraint : *pair.second )
 delete constraint;
 
 delete pair.second;
 }
}
 
 
static bool isKeepoutZone( const BOARD_ITEM* aItem, bool aCheckFlags )
{
 if( !aItem || aItem->Type() != PCB_ZONE_T )
 return false;
 
 const ZONE* zone = static_cast<const ZONE*>( aItem );
 
 if( !zone->GetIsRuleArea() )
 return false;
 
 if( aCheckFlags )
 {
 if( !zone->GetDoNotAllowTracks()
 && !zone->GetDoNotAllowVias()
 && !zone->GetDoNotAllowPads()
 && !zone->GetDoNotAllowCopperPour()
 && !zone->GetDoNotAllowFootprints() )
 {
 return false;
 }
 }
 
 return true;
}
 
 
std::shared_ptr<DRC_RULE> DRC_ENGINE::createImplicitRule( const wxString& name )
{
 std::shared_ptr<DRC_RULE> rule = std::make_shared<DRC_RULE>();
 
 rule->m_Name = name;
 rule->m_Implicit = true;
 
 addRule( rule );
 
 return rule;
}
 
 
void DRC_ENGINE::loadImplicitRules()
{
 ReportAux( wxString::Format( wxT( "Building implicit rules (per-item/class overrides, etc...)" ) ) );
 
 BOARD_DESIGN_SETTINGS& bds = m_board->GetDesignSettings();
 
 // 1) global defaults
 
 std::shared_ptr<DRC_RULE> rule = createImplicitRule( _( "board setup constraints" ) );
 
 DRC_CONSTRAINT widthConstraint( TRACK_WIDTH_CONSTRAINT );
 widthConstraint.Value().SetMin( bds.m_TrackMinWidth );
 rule->AddConstraint( widthConstraint );
 
 DRC_CONSTRAINT connectionConstraint( CONNECTION_WIDTH_CONSTRAINT );
 connectionConstraint.Value().SetMin( bds.m_MinConn );
 rule->AddConstraint( connectionConstraint );
 
 DRC_CONSTRAINT drillConstraint( HOLE_SIZE_CONSTRAINT );
 drillConstraint.Value().SetMin( bds.m_MinThroughDrill );
 rule->AddConstraint( drillConstraint );
 
 DRC_CONSTRAINT annulusConstraint( ANNULAR_WIDTH_CONSTRAINT );
 annulusConstraint.Value().SetMin( bds.m_ViasMinAnnularWidth );
 rule->AddConstraint( annulusConstraint );
 
 DRC_CONSTRAINT diameterConstraint( VIA_DIAMETER_CONSTRAINT );
 diameterConstraint.Value().SetMin( bds.m_ViasMinSize );
 rule->AddConstraint( diameterConstraint );
 
 DRC_CONSTRAINT holeToHoleConstraint( HOLE_TO_HOLE_CONSTRAINT );
 holeToHoleConstraint.Value().SetMin( bds.m_HoleToHoleMin );
 rule->AddConstraint( holeToHoleConstraint );
 
 rule = createImplicitRule( _( "board setup constraints zone fill strategy" ) );
 DRC_CONSTRAINT thermalSpokeCountConstraint( MIN_RESOLVED_SPOKES_CONSTRAINT );
 thermalSpokeCountConstraint.Value().SetMin( bds.m_MinResolvedSpokes );
 rule->AddConstraint( thermalSpokeCountConstraint );
 
 rule = createImplicitRule( _( "board setup constraints silk" ) );
 rule->m_LayerCondition = LSET( { F_SilkS, B_SilkS } );
 DRC_CONSTRAINT silkClearanceConstraint( SILK_CLEARANCE_CONSTRAINT );
 silkClearanceConstraint.Value().SetMin( bds.m_SilkClearance );
 rule->AddConstraint( silkClearanceConstraint );
 
 rule = createImplicitRule( _( "board setup constraints silk text height" ) );
 rule->m_LayerCondition = LSET( { F_SilkS, B_SilkS } );
 DRC_CONSTRAINT silkTextHeightConstraint( TEXT_HEIGHT_CONSTRAINT );
 silkTextHeightConstraint.Value().SetMin( bds.m_MinSilkTextHeight );
 rule->AddConstraint( silkTextHeightConstraint );
 
 rule = createImplicitRule( _( "board setup constraints silk text thickness" ) );
 rule->m_LayerCondition = LSET( { F_SilkS, B_SilkS } );
 DRC_CONSTRAINT silkTextThicknessConstraint( TEXT_THICKNESS_CONSTRAINT );
 silkTextThicknessConstraint.Value().SetMin( bds.m_MinSilkTextThickness );
 rule->AddConstraint( silkTextThicknessConstraint );
 
 rule = createImplicitRule( _( "board setup constraints hole" ) );
 DRC_CONSTRAINT holeClearanceConstraint( HOLE_CLEARANCE_CONSTRAINT );
 holeClearanceConstraint.Value().SetMin( bds.m_HoleClearance );
 rule->AddConstraint( holeClearanceConstraint );
 
 rule = createImplicitRule( _( "board setup constraints edge" ) );
 DRC_CONSTRAINT edgeClearanceConstraint( EDGE_CLEARANCE_CONSTRAINT );
 edgeClearanceConstraint.Value().SetMin( bds.m_CopperEdgeClearance );
 rule->AddConstraint( edgeClearanceConstraint );
 
 rule = createImplicitRule( _( "board setup constraints courtyard" ) );
 DRC_CONSTRAINT courtyardClearanceConstraint( COURTYARD_CLEARANCE_CONSTRAINT );
 holeToHoleConstraint.Value().SetMin( 0 );
 rule->AddConstraint( courtyardClearanceConstraint );
 
 // 2) micro-via specific defaults (new DRC doesn't treat microvias in any special way)
 
 std::shared_ptr<DRC_RULE> uViaRule = createImplicitRule( _( "board setup micro-via constraints" ) );
 
 uViaRule->m_Condition = new DRC_RULE_CONDITION( wxT( "A.Via_Type == 'Micro'" ) );
 
 DRC_CONSTRAINT uViaDrillConstraint( HOLE_SIZE_CONSTRAINT );
 uViaDrillConstraint.Value().SetMin( bds.m_MicroViasMinDrill );
 uViaRule->AddConstraint( uViaDrillConstraint );
 
 DRC_CONSTRAINT uViaDiameterConstraint( VIA_DIAMETER_CONSTRAINT );
 uViaDiameterConstraint.Value().SetMin( bds.m_MicroViasMinSize );
 uViaRule->AddConstraint( uViaDiameterConstraint );
 
 // 3) per-netclass rules
 
 std::vector<std::shared_ptr<DRC_RULE>> netclassClearanceRules;
 std::vector<std::shared_ptr<DRC_RULE>> netclassItemSpecificRules;
 
 auto makeNetclassRules =
 [&]( const std::shared_ptr<NETCLASS>& nc, bool isDefault )
 {
 wxString ncName = nc->GetName();
 wxString friendlyName;
 wxString* shownName = &ncName;
 wxString expr;
 
 if( ncName.Replace( "'", "\\'" ) )
 {
 friendlyName = nc->GetName();
 shownName = &friendlyName;
 }
 
 if( nc->GetClearance() || nc->GetTrackWidth() )
 {
 std::shared_ptr<DRC_RULE> netclassRule = std::make_shared<DRC_RULE>();
 netclassRule->m_Name = wxString::Format( _( "netclass '%s'" ), *shownName );
 netclassRule->m_Implicit = true;
 
 expr = wxString::Format( wxT( "A.NetClass == '%s'" ), ncName );
 netclassRule->m_Condition = new DRC_RULE_CONDITION( expr );
 netclassClearanceRules.push_back( netclassRule );
 
 if( nc->GetClearance() )
 {
 DRC_CONSTRAINT constraint( CLEARANCE_CONSTRAINT );
 constraint.Value().SetMin( nc->GetClearance() );
 netclassRule->AddConstraint( constraint );
 }
 
 if( nc->GetTrackWidth() )
 {
 DRC_CONSTRAINT constraint( TRACK_WIDTH_CONSTRAINT );
 constraint.Value().SetMin( bds.m_TrackMinWidth );
 constraint.Value().SetOpt( nc->GetTrackWidth() );
 netclassRule->AddConstraint( constraint );
 }
 }
 
 if( nc->GetDiffPairWidth() )
 {
 std::shared_ptr<DRC_RULE> netclassRule = std::make_shared<DRC_RULE>();
 netclassRule->m_Name = wxString::Format( _( "netclass '%s' (diff pair)" ),
 *shownName );
 netclassRule->m_Implicit = true;
 
 expr = wxString::Format( wxT( "A.NetClass == '%s' && A.inDiffPair('*')" ),
 ncName );
 netclassRule->m_Condition = new DRC_RULE_CONDITION( expr );
 netclassItemSpecificRules.push_back( netclassRule );
 
 DRC_CONSTRAINT constraint( TRACK_WIDTH_CONSTRAINT );
 constraint.Value().SetMin( bds.m_TrackMinWidth );
 constraint.Value().SetOpt( nc->GetDiffPairWidth() );
 netclassRule->AddConstraint( constraint );
 }
 
 if( nc->GetDiffPairGap() )
 {
 std::shared_ptr<DRC_RULE> netclassRule = std::make_shared<DRC_RULE>();
 netclassRule->m_Name = wxString::Format( _( "netclass '%s' (diff pair)" ),
 *shownName );
 netclassRule->m_Implicit = true;
 
 expr = wxString::Format( wxT( "A.NetClass == '%s'" ), ncName );
 netclassRule->m_Condition = new DRC_RULE_CONDITION( expr );
 netclassItemSpecificRules.push_back( netclassRule );
 
 DRC_CONSTRAINT constraint( DIFF_PAIR_GAP_CONSTRAINT );
 constraint.Value().SetMin( bds.m_MinClearance );
 constraint.Value().SetOpt( nc->GetDiffPairGap() );
 netclassRule->AddConstraint( constraint );
 
 // A narrower diffpair gap overrides the netclass min clearance
 if( nc->GetDiffPairGap() < nc->GetClearance() )
 {
 netclassRule = std::make_shared<DRC_RULE>();
 netclassRule->m_Name = wxString::Format( _( "netclass '%s' (diff pair)" ),
 *shownName );
 netclassRule->m_Implicit = true;
 
 expr = wxString::Format( wxT( "A.NetClass == '%s' && AB.isCoupledDiffPair()" ),
 ncName );
 netclassRule->m_Condition = new DRC_RULE_CONDITION( expr );
 netclassItemSpecificRules.push_back( netclassRule );
 
 DRC_CONSTRAINT min_clearanceConstraint( CLEARANCE_CONSTRAINT );
 min_clearanceConstraint.Value().SetMin( nc->GetDiffPairGap() );
 netclassRule->AddConstraint( min_clearanceConstraint );
 }
 }
 
 if( nc->GetViaDiameter() || nc->GetViaDrill() )
 {
 std::shared_ptr<DRC_RULE> netclassRule = std::make_shared<DRC_RULE>();
 netclassRule->m_Name = wxString::Format( _( "netclass '%s'" ), *shownName );
 netclassRule->m_Implicit = true;
 
 expr = wxString::Format( wxT( "A.NetClass == '%s' && A.Via_Type != 'Micro'" ),
 ncName );
 netclassRule->m_Condition = new DRC_RULE_CONDITION( expr );
 netclassItemSpecificRules.push_back( netclassRule );
 
 if( nc->GetViaDiameter() )
 {
 DRC_CONSTRAINT constraint( VIA_DIAMETER_CONSTRAINT );
 constraint.Value().SetMin( bds.m_ViasMinSize );
 constraint.Value().SetOpt( nc->GetViaDiameter() );
 netclassRule->AddConstraint( constraint );
 }
 
 if( nc->GetViaDrill() )
 {
 DRC_CONSTRAINT constraint( HOLE_SIZE_CONSTRAINT );
 constraint.Value().SetMin( bds.m_MinThroughDrill );
 constraint.Value().SetOpt( nc->GetViaDrill() );
 netclassRule->AddConstraint( constraint );
 }
 }
 
 if( nc->GetuViaDiameter() || nc->GetuViaDrill() )
 {
 std::shared_ptr<DRC_RULE> netclassRule = std::make_shared<DRC_RULE>();
 netclassRule->m_Name = wxString::Format( _( "netclass '%s' (uvia)" ),
 *shownName );
 netclassRule->m_Implicit = true;
 
 expr = wxString::Format( wxT( "A.NetClass == '%s' && A.Via_Type == 'Micro'" ),
 ncName );
 netclassRule->m_Condition = new DRC_RULE_CONDITION( expr );
 netclassItemSpecificRules.push_back( netclassRule );
 
 if( nc->GetuViaDiameter() )
 {
 DRC_CONSTRAINT constraint( VIA_DIAMETER_CONSTRAINT );
 constraint.Value().SetMin( bds.m_MicroViasMinSize );
 constraint.Value().SetMin( nc->GetuViaDiameter() );
 netclassRule->AddConstraint( constraint );
 }
 
 if( nc->GetuViaDrill() )
 {
 DRC_CONSTRAINT constraint( HOLE_SIZE_CONSTRAINT );
 constraint.Value().SetMin( bds.m_MicroViasMinDrill );
 constraint.Value().SetOpt( nc->GetuViaDrill() );
 netclassRule->AddConstraint( constraint );
 }
 }
 };
 
 m_board->SynchronizeNetsAndNetClasses( false );
 makeNetclassRules( bds.m_NetSettings->m_DefaultNetClass, true );
 
 for( const auto& [ name, netclass ] : bds.m_NetSettings->m_NetClasses )
 makeNetclassRules( netclass, false );
 
 // The netclass clearance rules have to be sorted by min clearance so the right one fires
 // if 'A' and 'B' belong to two different netclasses.
 //
 // The item-specific netclass rules are all unary, so there's no 'A' vs 'B' issue.
 
 std::sort( netclassClearanceRules.begin(), netclassClearanceRules.end(),
 []( const std::shared_ptr<DRC_RULE>& lhs, const std::shared_ptr<DRC_RULE>& rhs )
 {
 return lhs->m_Constraints[0].m_Value.Min()
 < rhs->m_Constraints[0].m_Value.Min();
 } );
 
 for( std::shared_ptr<DRC_RULE>& ncRule : netclassClearanceRules )
 addRule( ncRule );
 
 for( std::shared_ptr<DRC_RULE>& ncRule : netclassItemSpecificRules )
 addRule( ncRule );
 
 // 3) keepout area rules
 
 std::vector<ZONE*> keepoutZones;
 
 for( ZONE* zone : m_board->Zones() )
 {
 if( isKeepoutZone( zone, true ) )
 keepoutZones.push_back( zone );
 }
 
 for( FOOTPRINT* footprint : m_board->Footprints() )
 {
 for( ZONE* zone : footprint->Zones() )
 {
 if( isKeepoutZone( zone, true ) )
 keepoutZones.push_back( zone );
 }
 }
 
 for( ZONE* zone : keepoutZones )
 {
 wxString name = zone->GetZoneName();
 
 if( name.IsEmpty() )
 rule = createImplicitRule( _( "keepout area" ) );
 else
 rule = createImplicitRule( wxString::Format( _( "keepout area '%s'" ), name ) );
 
 rule->m_ImplicitItemId = zone->m_Uuid;
 
 rule->m_Condition = new DRC_RULE_CONDITION( wxString::Format( wxT( "A.intersectsArea('%s')" ),
 zone->m_Uuid.AsString() ) );
 
 rule->m_LayerCondition = zone->GetLayerSet();
 
 int disallowFlags = 0;
 
 if( zone->GetDoNotAllowTracks() )
 disallowFlags |= DRC_DISALLOW_TRACKS;
 
 if( zone->GetDoNotAllowVias() )
 disallowFlags |= DRC_DISALLOW_VIAS;
 
 if( zone->GetDoNotAllowPads() )
 disallowFlags |= DRC_DISALLOW_PADS;
 
 if( zone->GetDoNotAllowCopperPour() )
 disallowFlags |= DRC_DISALLOW_ZONES;
 
 if( zone->GetDoNotAllowFootprints() )
 disallowFlags |= DRC_DISALLOW_FOOTPRINTS;
 
 DRC_CONSTRAINT disallowConstraint( DISALLOW_CONSTRAINT );
 disallowConstraint.m_DisallowFlags = disallowFlags;
 rule->AddConstraint( disallowConstraint );
 }
 
 ReportAux( wxString::Format( wxT( "Building %d implicit netclass rules" ),
 (int) netclassClearanceRules.size() ) );
}
 
 
void DRC_ENGINE::loadRules( const wxFileName& aPath )
{
 if( aPath.FileExists() )
 {
 std::vector<std::shared_ptr<DRC_RULE>> rules;
 
 FILE* fp = wxFopen( aPath.GetFullPath(), wxT( "rt" ) );
 
 if( fp )
 {
 DRC_RULES_PARSER parser( fp, aPath.GetFullPath() );
 parser.Parse( rules, m_reporter );
 }
 
 // Copy the rules into the member variable afterwards so that if Parse() throws then
 // the possibly malformed rules won't contaminate the current ruleset.
 
 for( std::shared_ptr<DRC_RULE>& rule : rules )
 m_rules.push_back( rule );
 }
}
 
 
void DRC_ENGINE::compileRules()
{
 ReportAux( wxString::Format( wxT( "Compiling Rules (%d rules): " ), (int) m_rules.size() ) );
 
 for( std::shared_ptr<DRC_RULE>& rule : m_rules )
 {
 DRC_RULE_CONDITION* condition = nullptr;
 
 if( rule->m_Condition && !rule->m_Condition->GetExpression().IsEmpty() )
 {
 condition = rule->m_Condition;
 condition->Compile( nullptr );
 }
 
 for( const DRC_CONSTRAINT& constraint : rule->m_Constraints )
 {
 if( !m_constraintMap.count( constraint.m_Type ) )
 m_constraintMap[ constraint.m_Type ] = new std::vector<DRC_ENGINE_CONSTRAINT*>();
 
 DRC_ENGINE_CONSTRAINT* engineConstraint = new DRC_ENGINE_CONSTRAINT;
 
 engineConstraint->layerTest = rule->m_LayerCondition;
 engineConstraint->condition = condition;
 engineConstraint->constraint = constraint;
 engineConstraint->parentRule = rule;
 m_constraintMap[ constraint.m_Type ]->push_back( engineConstraint );
 }
 }
}
 
 
void DRC_ENGINE::InitEngine( const wxFileName& aRulePath )
{
 m_testProviders = DRC_TEST_PROVIDER_REGISTRY::Instance().GetTestProviders();
 
 for( DRC_TEST_PROVIDER* provider : m_testProviders )
 {
 ReportAux( wxString::Format( wxT( "Create DRC provider: '%s'" ), provider->GetName() ) );
 provider->SetDRCEngine( this );
 }
 
 m_rules.clear();
 m_rulesValid = false;
 
 for( std::pair<DRC_CONSTRAINT_T, std::vector<DRC_ENGINE_CONSTRAINT*>*> pair : m_constraintMap )
 {
 for( DRC_ENGINE_CONSTRAINT* constraint : *pair.second )
 delete constraint;
 
 delete pair.second;
 }
 
 m_constraintMap.clear();
 
 m_board->IncrementTimeStamp(); // Clear board-level caches
 
 try // attempt to load full set of rules (implicit + user rules)
 {
 loadImplicitRules();
 loadRules( aRulePath );
 compileRules();
 }
 catch( PARSE_ERROR& original_parse_error )
 {
 try // try again with just our implicit rules
 {
 loadImplicitRules();
 compileRules();
 }
 catch( PARSE_ERROR& )
 {
 wxFAIL_MSG( wxT( "Compiling implicit rules failed." ) );
 }
 
 throw original_parse_error;
 }
 
 for( int ii = DRCE_FIRST; ii < DRCE_LAST; ++ii )
 m_errorLimits[ ii ] = ERROR_LIMIT;
 
 m_rulesValid = true;
}
 
 
void DRC_ENGINE::RunTests( EDA_UNITS aUnits, bool aReportAllTrackErrors, bool aTestFootprints )
{
 SetUserUnits( aUnits );
 
 m_reportAllTrackErrors = aReportAllTrackErrors;
 m_testFootprints = aTestFootprints;
 
 for( int ii = DRCE_FIRST; ii < DRCE_LAST; ++ii )
 {
 if( m_designSettings->Ignore( ii ) )
 m_errorLimits[ ii ] = 0;
 else if( ii == DRCE_CLEARANCE || ii == DRCE_UNCONNECTED_ITEMS )
 m_errorLimits[ ii ] = EXTENDED_ERROR_LIMIT;
 else
 m_errorLimits[ ii ] = ERROR_LIMIT;
 }
 
 DRC_TEST_PROVIDER::Init();
 
 m_board->IncrementTimeStamp(); // Invalidate all caches...
 
 DRC_CACHE_GENERATOR cacheGenerator;
 cacheGenerator.SetDRCEngine( this );
 
 if( !cacheGenerator.Run() ) // ... and regenerate them.
 return;
 
 int timestamp = m_board->GetTimeStamp();
 
 for( DRC_TEST_PROVIDER* provider : m_testProviders )
 {
 ReportAux( wxString::Format( wxT( "Run DRC provider: '%s'" ), provider->GetName() ) );
 
 if( !provider->RunTests( aUnits ) )
 break;
 }
 
 // DRC tests are multi-threaded; anything that causes us to attempt to re-generate the
 // caches while DRC is running is problematic.
 wxASSERT( timestamp == m_board->GetTimeStamp() );
}
 
 
#define REPORT( s ) { if( aReporter ) { aReporter->Report( s ); } }
 
DRC_CONSTRAINT DRC_ENGINE::EvalZoneConnection( const BOARD_ITEM* a, const BOARD_ITEM* b,
 PCB_LAYER_ID aLayer, REPORTER* aReporter )
{
 DRC_CONSTRAINT constraint = EvalRules( ZONE_CONNECTION_CONSTRAINT, a, b, aLayer, aReporter );
 
 REPORT( "" )
 REPORT( wxString::Format( _( "Resolved zone connection type: %s." ),
 EscapeHTML( PrintZoneConnection( constraint.m_ZoneConnection ) ) ) )
 
 if( constraint.m_ZoneConnection == ZONE_CONNECTION::THT_THERMAL )
 {
 const PAD* pad = nullptr;
 
 if( a->Type() == PCB_PAD_T )
 pad = static_cast<const PAD*>( a );
 else if( b->Type() == PCB_PAD_T )
 pad = static_cast<const PAD*>( b );
 
 if( pad && pad->GetAttribute() == PAD_ATTRIB::PTH )
 {
 constraint.m_ZoneConnection = ZONE_CONNECTION::THERMAL;
 }
 else
 {
 REPORT( wxString::Format( _( "Pad is not a through hole pad; connection will be: %s." ),
 EscapeHTML( PrintZoneConnection( ZONE_CONNECTION::FULL ) ) ) )
 constraint.m_ZoneConnection = ZONE_CONNECTION::FULL;
 }
 }
 
 return constraint;
}
 
 
DRC_CONSTRAINT DRC_ENGINE::EvalRules( DRC_CONSTRAINT_T aConstraintType, const BOARD_ITEM* a,
 const BOARD_ITEM* b, PCB_LAYER_ID aLayer,
 REPORTER* aReporter )
{
 /*
 * NOTE: all string manipulation MUST BE KEPT INSIDE the REPORT macro. It absolutely
 * kills performance when running bulk DRC tests (where aReporter is nullptr).
 */
 
 const BOARD_CONNECTED_ITEM* ac = a && a->IsConnected() ?
 static_cast<const BOARD_CONNECTED_ITEM*>( a ) : nullptr;
 const BOARD_CONNECTED_ITEM* bc = b && b->IsConnected() ?
 static_cast<const BOARD_CONNECTED_ITEM*>( b ) : nullptr;
 
 bool a_is_non_copper = a && ( !a->IsOnCopperLayer() || isKeepoutZone( a, false ) );
 bool b_is_non_copper = b && ( !b->IsOnCopperLayer() || isKeepoutZone( b, false ) );
 
 const PAD* pad = nullptr;
 const ZONE* zone = nullptr;
 const FOOTPRINT* parentFootprint = nullptr;
 
 if( aConstraintType == ZONE_CONNECTION_CONSTRAINT
 || aConstraintType == THERMAL_RELIEF_GAP_CONSTRAINT
 || aConstraintType == THERMAL_SPOKE_WIDTH_CONSTRAINT )
 {
 if( a && a->Type() == PCB_PAD_T )
 pad = static_cast<const PAD*>( a );
 else if( a && a->Type() == PCB_ZONE_T )
 zone = static_cast<const ZONE*>( a );
 
 if( b && b->Type() == PCB_PAD_T )
 pad = static_cast<const PAD*>( b );
 else if( b && b->Type() == PCB_ZONE_T )
 zone = static_cast<const ZONE*>( b );
 
 if( pad )
 parentFootprint = pad->GetParentFootprint();
 }
 
 DRC_CONSTRAINT constraint;
 constraint.m_Type = aConstraintType;
 
 auto applyConstraint =
 [&]( const DRC_ENGINE_CONSTRAINT* c )
 {
 if( c->constraint.m_Value.HasMin() )
 constraint.m_Value.SetMin( c->constraint.m_Value.Min() );
 
 if( c->constraint.m_Value.HasOpt() )
 constraint.m_Value.SetOpt( c->constraint.m_Value.Opt() );
 
 if( c->constraint.m_Value.HasMax() )
 constraint .m_Value.SetMax( c->constraint.m_Value.Max() );
 
 // While the expectation would be to OR the disallow flags, we've already
 // masked them down to aItem's type -- so we're really only looking for a
 // boolean here.
 constraint.m_DisallowFlags = c->constraint.m_DisallowFlags;
 
 constraint.m_ZoneConnection = c->constraint.m_ZoneConnection;
 
 constraint.SetParentRule( c->constraint.GetParentRule() );
 };
 
 // Local overrides take precedence over everything *except* board min clearance
 if( aConstraintType == CLEARANCE_CONSTRAINT || aConstraintType == HOLE_CLEARANCE_CONSTRAINT )
 {
 int override_val = 0;
 std::optional<int> overrideA;
 std::optional<int> overrideB;
 
 if( ac && !b_is_non_copper )
 overrideA = ac->GetClearanceOverrides( nullptr );
 
 if( bc && !a_is_non_copper )
 overrideB = bc->GetClearanceOverrides( nullptr );
 
 if( overrideA.has_value() || overrideB.has_value() )
 {
 wxString msg;
 
 if( overrideA.has_value() )
 {
 REPORT( "" )
 REPORT( wxString::Format( _( "Local override on %s; clearance: %s." ),
 EscapeHTML( a->GetItemDescription( this, true ) ),
 MessageTextFromValue( overrideA.value() ) ) )
 
 override_val = ac->GetClearanceOverrides( &msg ).value();
 }
 
 if( overrideB.has_value() )
 {
 REPORT( "" )
 REPORT( wxString::Format( _( "Local override on %s; clearance: %s." ),
 EscapeHTML( b->GetItemDescription( this, true ) ),
 EscapeHTML( MessageTextFromValue( overrideB.value() ) ) ) )
 
 if( overrideB > override_val )
 override_val = bc->GetClearanceOverrides( &msg ).value();
 }
 
 if( override_val )
 {
 if( aConstraintType == CLEARANCE_CONSTRAINT )
 {
 if( override_val < m_designSettings->m_MinClearance )
 {
 override_val = m_designSettings->m_MinClearance;
 msg = _( "board minimum" );
 
 REPORT( "" )
 REPORT( wxString::Format( _( "Board minimum clearance: %s." ),
 MessageTextFromValue( override_val ) ) )
 }
 }
 else
 {
 if( override_val < m_designSettings->m_HoleClearance )
 {
 override_val = m_designSettings->m_HoleClearance;
 msg = _( "board minimum hole" );
 
 REPORT( "" )
 REPORT( wxString::Format( _( "Board minimum hole clearance: %s." ),
 MessageTextFromValue( override_val ) ) )
 }
 }
 
 constraint.SetName( msg );
 constraint.m_Value.SetMin( override_val );
 return constraint;
 }
 }
 }
 else if( aConstraintType == ZONE_CONNECTION_CONSTRAINT )
 {
 if( pad && pad->GetLocalZoneConnection() != ZONE_CONNECTION::INHERITED )
 {
 wxString msg;
 ZONE_CONNECTION override = pad->GetZoneConnectionOverrides( &msg );
 
 REPORT( "" )
 REPORT( wxString::Format( _( "Local override on %s; zone connection: %s." ),
 EscapeHTML( pad->GetItemDescription( this, true ) ),
 EscapeHTML( PrintZoneConnection( override ) ) ) )
 
 constraint.SetName( msg );
 constraint.m_ZoneConnection = override;
 return constraint;
 }
 }
 else if( aConstraintType == THERMAL_RELIEF_GAP_CONSTRAINT )
 {
 if( pad && pad->GetLocalThermalGapOverride( nullptr ) > 0 )
 {
 wxString msg;
 int gap_override = pad->GetLocalThermalGapOverride( &msg );
 
 REPORT( "" )
 REPORT( wxString::Format( _( "Local override on %s; thermal relief gap: %s." ),
 EscapeHTML( pad->GetItemDescription( this, true ) ),
 EscapeHTML( MessageTextFromValue( gap_override ) ) ) )
 
 constraint.SetName( msg );
 constraint.m_Value.SetMin( gap_override );
 return constraint;
 }
 }
 else if( aConstraintType == THERMAL_SPOKE_WIDTH_CONSTRAINT )
 {
 if( pad && pad->GetLocalSpokeWidthOverride( nullptr ) > 0 )
 {
 wxString msg;
 int spoke_override = pad->GetLocalSpokeWidthOverride( &msg );
 
 REPORT( "" )
 REPORT( wxString::Format( _( "Local override on %s; thermal spoke width: %s." ),
 EscapeHTML( pad->GetItemDescription( this, true ) ),
 EscapeHTML( MessageTextFromValue( spoke_override ) ) ) )
 
 if( zone && zone->GetMinThickness() > spoke_override )
 {
 spoke_override = zone->GetMinThickness();
 
 REPORT( "" )
 REPORT( wxString::Format( _( "%s min thickness: %s." ),
 EscapeHTML( zone->GetItemDescription( this, true ) ),
 EscapeHTML( MessageTextFromValue( spoke_override ) ) ) )
 }
 
 constraint.SetName( msg );
 constraint.m_Value.SetMin( spoke_override );
 return constraint;
 }
 }
 
 auto testAssertion =
 [&]( const DRC_ENGINE_CONSTRAINT* c )
 {
 REPORT( wxString::Format( _( "Checking assertion \"%s\"." ),
 EscapeHTML( c->constraint.m_Test->GetExpression() ) ) )
 
 if( c->constraint.m_Test->EvaluateFor( a, b, c->constraint.m_Type, aLayer,
 aReporter ) )
 {
 REPORT( _( "Assertion passed." ) )
 }
 else
 {
 REPORT( EscapeHTML( _( "--> Assertion failed. <--" ) ) )
 }
 };
 
 auto processConstraint =
 [&]( const DRC_ENGINE_CONSTRAINT* c )
 {
 bool implicit = c->parentRule && c->parentRule->m_Implicit;
 
 REPORT( "" )
 
 switch( c->constraint.m_Type )
 {
 case CLEARANCE_CONSTRAINT:
 case COURTYARD_CLEARANCE_CONSTRAINT:
 case SILK_CLEARANCE_CONSTRAINT:
 case HOLE_CLEARANCE_CONSTRAINT:
 case EDGE_CLEARANCE_CONSTRAINT:
 case PHYSICAL_CLEARANCE_CONSTRAINT:
 case PHYSICAL_HOLE_CLEARANCE_CONSTRAINT:
 REPORT( wxString::Format( _( "Checking %s clearance: %s." ),
 EscapeHTML( c->constraint.GetName() ),
 MessageTextFromValue( c->constraint.m_Value.Min() ) ) )
 break;
 
 case MAX_UNCOUPLED_CONSTRAINT:
 REPORT( wxString::Format( _( "Checking %s max uncoupled length: %s." ),
 EscapeHTML( c->constraint.GetName() ),
 MessageTextFromValue( c->constraint.m_Value.Max() ) ) )
 break;
 
 case SKEW_CONSTRAINT:
 REPORT( wxString::Format( _( "Checking %s max skew: %s." ),
 EscapeHTML( c->constraint.GetName() ),
 MessageTextFromValue( c->constraint.m_Value.Max() ) ) )
 break;
 
 case THERMAL_RELIEF_GAP_CONSTRAINT:
 REPORT( wxString::Format( _( "Checking %s gap: %s." ),
 EscapeHTML( c->constraint.GetName() ),
 MessageTextFromValue( c->constraint.m_Value.Min() ) ) )
 break;
 
 case THERMAL_SPOKE_WIDTH_CONSTRAINT:
 REPORT( wxString::Format( _( "Checking %s thermal spoke width: %s." ),
 EscapeHTML( c->constraint.GetName() ),
 MessageTextFromValue( c->constraint.m_Value.Opt() ) ) )
 break;
 
 case MIN_RESOLVED_SPOKES_CONSTRAINT:
 REPORT( wxString::Format( _( "Checking %s min spoke count: %s." ),
 EscapeHTML( c->constraint.GetName() ),
 EDA_UNIT_UTILS::UI::MessageTextFromValue( unityScale, EDA_UNITS::UNSCALED,
 c->constraint.m_Value.Min() ) ) )
 break;
 
 case ZONE_CONNECTION_CONSTRAINT:
 REPORT( wxString::Format( _( "Checking %s zone connection: %s." ),
 EscapeHTML( c->constraint.GetName() ),
 EscapeHTML( PrintZoneConnection( c->constraint.m_ZoneConnection ) ) ) )
 break;
 
 case TRACK_WIDTH_CONSTRAINT:
 case ANNULAR_WIDTH_CONSTRAINT:
 case VIA_DIAMETER_CONSTRAINT:
 case HOLE_SIZE_CONSTRAINT:
 case TEXT_HEIGHT_CONSTRAINT:
 case TEXT_THICKNESS_CONSTRAINT:
 case DIFF_PAIR_GAP_CONSTRAINT:
 case LENGTH_CONSTRAINT:
 case CONNECTION_WIDTH_CONSTRAINT:
 case HOLE_TO_HOLE_CONSTRAINT:
 {
 if( aReporter )
 {
 wxString min = wxT( "<i>" ) + _( "undefined" ) + wxT( "</i>" );
 wxString opt = wxT( "<i>" ) + _( "undefined" ) + wxT( "</i>" );
 wxString max = wxT( "<i>" ) + _( "undefined" ) + wxT( "</i>" );
 
 if( implicit )
 {
 min = MessageTextFromValue( c->constraint.m_Value.Min() );
 opt = MessageTextFromValue( c->constraint.m_Value.Opt() );
 
 switch( c->constraint.m_Type )
 {
 case TRACK_WIDTH_CONSTRAINT:
 if( c->constraint.m_Value.HasOpt() )
 {
 REPORT( wxString::Format( _( "Checking %s track width: opt %s." ),
 EscapeHTML( c->constraint.GetName() ),
 opt ) )
 }
 else if( c->constraint.m_Value.HasMin() )
 {
 REPORT( wxString::Format( _( "Checking %s track width: min %s." ),
 EscapeHTML( c->constraint.GetName() ),
 min ) )
 }
 
 break;
 
 case ANNULAR_WIDTH_CONSTRAINT:
 REPORT( wxString::Format( _( "Checking %s annular width: min %s." ),
 EscapeHTML( c->constraint.GetName() ),
 opt ) )
 break;
 
 case VIA_DIAMETER_CONSTRAINT:
 if( c->constraint.m_Value.HasOpt() )
 {
 REPORT( wxString::Format( _( "Checking %s via diameter: opt %s." ),
 EscapeHTML( c->constraint.GetName() ),
 opt ) )
 }
 else if( c->constraint.m_Value.HasMin() )
 {
 REPORT( wxString::Format( _( "Checking %s via diameter: min %s." ),
 EscapeHTML( c->constraint.GetName() ),
 min ) )
 }
 break;
 
 case HOLE_SIZE_CONSTRAINT:
 if( c->constraint.m_Value.HasOpt() )
 {
 REPORT( wxString::Format( _( "Checking %s hole size: opt %s." ),
 EscapeHTML( c->constraint.GetName() ),
 opt ) )
 }
 else if( c->constraint.m_Value.HasMin() )
 {
 REPORT( wxString::Format( _( "Checking %s hole size: min %s." ),
 EscapeHTML( c->constraint.GetName() ),
 min ) )
 }
 
 break;
 
 case TEXT_HEIGHT_CONSTRAINT:
 case TEXT_THICKNESS_CONSTRAINT:
 case CONNECTION_WIDTH_CONSTRAINT:
 REPORT( wxString::Format( _( "Checking %s: min %s." ),
 EscapeHTML( c->constraint.GetName() ),
 min ) )
 break;
 
 case DIFF_PAIR_GAP_CONSTRAINT:
 if( c->constraint.m_Value.HasOpt() )
 {
 REPORT( wxString::Format( _( "Checking %s diff pair gap: opt %s." ),
 EscapeHTML( c->constraint.GetName() ),
 opt ) )
 }
 else if( c->constraint.m_Value.HasMin() )
 {
 REPORT( wxString::Format( _( "Checking %s clearance: min %s." ),
 EscapeHTML( c->constraint.GetName() ),
 min ) )
 }
 
 break;
 
 case HOLE_TO_HOLE_CONSTRAINT:
 REPORT( wxString::Format( _( "Checking %s hole to hole: min %s." ),
 EscapeHTML( c->constraint.GetName() ),
 min ) )
 break;
 
 default:
 REPORT( wxString::Format( _( "Checking %s." ),
 EscapeHTML( c->constraint.GetName() ) ) )
 }
 }
 else
 {
 if( c->constraint.m_Value.HasMin() )
 min = MessageTextFromValue( c->constraint.m_Value.Min() );
 
 if( c->constraint.m_Value.HasOpt() )
 opt = MessageTextFromValue( c->constraint.m_Value.Opt() );
 
 if( c->constraint.m_Value.HasMax() )
 max = MessageTextFromValue( c->constraint.m_Value.Max() );
 
 REPORT( wxString::Format( _( "Checking %s: min %s; opt %s; max %s." ),
 EscapeHTML( c->constraint.GetName() ),
 min,
 opt,
 max ) )
 }
 }
 break;
 }
 
 default:
 REPORT( wxString::Format( _( "Checking %s." ),
 EscapeHTML( c->constraint.GetName() ) ) )
 }
 
 if( c->constraint.m_Type == CLEARANCE_CONSTRAINT )
 {
 if( a_is_non_copper || b_is_non_copper )
 {
 if( implicit )
 {
 REPORT( _( "Netclass clearances apply only between copper items." ) )
 }
 else if( a_is_non_copper )
 {
 REPORT( wxString::Format( _( "%s contains no copper. Rule ignored." ),
 EscapeHTML( a->GetItemDescription( this, true ) ) ) )
 }
 else if( b_is_non_copper )
 {
 REPORT( wxString::Format( _( "%s contains no copper. Rule ignored." ),
 EscapeHTML( b->GetItemDescription( this, true ) ) ) )
 }
 
 return;
 }
 }
 else if( c->constraint.m_Type == DISALLOW_CONSTRAINT )
 {
 int mask;
 
 if( a->GetFlags() & HOLE_PROXY )
 {
 mask = DRC_DISALLOW_HOLES;
 }
 else if( a->Type() == PCB_VIA_T )
 {
 mask = DRC_DISALLOW_VIAS;
 
 switch( static_cast<const PCB_VIA*>( a )->GetViaType() )
 {
 case VIATYPE::BLIND_BURIED: mask |= DRC_DISALLOW_BB_VIAS; break;
 case VIATYPE::MICROVIA: mask |= DRC_DISALLOW_MICRO_VIAS; break;
 default: break;
 }
 }
 else
 {
 switch( a->Type() )
 {
 case PCB_TRACE_T: mask = DRC_DISALLOW_TRACKS; break;
 case PCB_ARC_T: mask = DRC_DISALLOW_TRACKS; break;
 case PCB_PAD_T: mask = DRC_DISALLOW_PADS; break;
 case PCB_FOOTPRINT_T: mask = DRC_DISALLOW_FOOTPRINTS; break;
 case PCB_SHAPE_T: mask = DRC_DISALLOW_GRAPHICS; break;
 case PCB_FIELD_T: mask = DRC_DISALLOW_TEXTS; break;
 case PCB_TEXT_T: mask = DRC_DISALLOW_TEXTS; break;
 case PCB_TEXTBOX_T: mask = DRC_DISALLOW_TEXTS; break;
 case PCB_TABLE_T: mask = DRC_DISALLOW_TEXTS; break;
 
 case PCB_ZONE_T:
 // Treat teardrop areas as tracks for DRC purposes
 if( static_cast<const ZONE*>( a )->IsTeardropArea() )
 mask = DRC_DISALLOW_TRACKS;
 else
 mask = DRC_DISALLOW_ZONES;
 
 break;
 
 case PCB_LOCATE_HOLE_T: mask = DRC_DISALLOW_HOLES; break;
 default: mask = 0; break;
 }
 }
 
 if( ( c->constraint.m_DisallowFlags & mask ) == 0 )
 {
 if( implicit )
 REPORT( _( "Keepout constraint not met." ) )
 else
 REPORT( _( "Disallow constraint not met." ) )
 
 return;
 }
 
 LSET itemLayers = a->GetLayerSet();
 
 if( a->Type() == PCB_FOOTPRINT_T )
 {
 const FOOTPRINT* footprint = static_cast<const FOOTPRINT*>( a );
 
 if( !footprint->GetCourtyard( F_CrtYd ).IsEmpty() )
 itemLayers |= LSET::FrontMask();
 
 if( !footprint->GetCourtyard( B_CrtYd ).IsEmpty() )
 itemLayers |= LSET::BackMask();
 }
 
 if( !( c->layerTest & itemLayers ).any() )
 {
 if( implicit )
 {
 REPORT( _( "Keepout layer(s) not matched." ) )
 }
 else if( c->parentRule )
 {
 REPORT( wxString::Format( _( "Rule layer '%s' not matched; rule ignored." ),
 EscapeHTML( c->parentRule->m_LayerSource ) ) )
 }
 else
 {
 REPORT( _( "Rule layer not matched; rule ignored." ) )
 }
 
 return;
 }
 }
 
 if( ( aLayer != UNDEFINED_LAYER && !c->layerTest.test( aLayer ) )
 || ( m_board->GetEnabledLayers() & c->layerTest ).count() == 0 )
 {
 if( implicit )
 {
 REPORT( _( "Constraint layer not matched." ) )
 }
 else if( c->parentRule )
 {
 REPORT( wxString::Format( _( "Rule layer '%s' not matched; rule ignored." ),
 EscapeHTML( c->parentRule->m_LayerSource ) ) )
 }
 else
 {
 REPORT( _( "Rule layer not matched; rule ignored." ) )
 }
 }
 else if( c->constraint.m_Type == HOLE_TO_HOLE_CONSTRAINT
 && ( !a->HasDrilledHole() && !b->HasDrilledHole() ) )
 {
 // Report non-drilled-holes as an implicit condition
 REPORT( wxString::Format( _( "%s is not a drilled hole; rule ignored." ),
 a->GetItemDescription( this, true ) ) )
 }
 else if( !c->condition || c->condition->GetExpression().IsEmpty() )
 {
 if( aReporter )
 {
 if( implicit )
 {
 REPORT( _( "Unconditional constraint applied." ) )
 }
 else if( constraint.m_Type == ASSERTION_CONSTRAINT )
 {
 REPORT( _( "Unconditional rule applied." ) )
 testAssertion( c );
 }
 else
 {
 REPORT( _( "Unconditional rule applied; overrides previous constraints." ) )
 }
 }
 
 applyConstraint( c );
 }
 else
 {
 if( implicit )
 {
 // Don't report on implicit rule conditions; they're synthetic.
 }
 else
 {
 REPORT( wxString::Format( _( "Checking rule condition \"%s\"." ),
 EscapeHTML( c->condition->GetExpression() ) ) )
 }
 
 if( c->condition->EvaluateFor( a, b, c->constraint.m_Type, aLayer, aReporter ) )
 {
 if( aReporter )
 {
 if( implicit )
 {
 REPORT( _( "Constraint applied." ) )
 }
 else if( constraint.m_Type == ASSERTION_CONSTRAINT )
 {
 REPORT( _( "Rule applied." ) )
 testAssertion( c );
 }
 else
 {
 REPORT( _( "Rule applied; overrides previous constraints." ) )
 }
 }
 
 applyConstraint( c );
 }
 else
 {
 REPORT( implicit ? _( "Membership not satisfied; constraint ignored." )
 : _( "Condition not satisfied; rule ignored." ) )
 }
 }
 };
 
 if( m_constraintMap.count( aConstraintType ) )
 {
 std::vector<DRC_ENGINE_CONSTRAINT*>* ruleset = m_constraintMap[ aConstraintType ];
 
 for( int ii = 0; ii < (int) ruleset->size(); ++ii )
 processConstraint( ruleset->at( ii ) );
 }
 
 if( constraint.GetParentRule() && !constraint.GetParentRule()->m_Implicit )
 return constraint;
 
 // Special case for pad zone connections which can iherit from their parent footprints.
 // We've already checked for local overrides, and there were no rules targetting the pad
 // itself, so we know we're inheriting and need to see if there are any rules targetting
 // the parent footprint.
 if( pad && parentFootprint && ( aConstraintType == ZONE_CONNECTION_CONSTRAINT
 || aConstraintType == THERMAL_RELIEF_GAP_CONSTRAINT
 || aConstraintType == THERMAL_SPOKE_WIDTH_CONSTRAINT ) )
 {
 if( a == pad )
 a = parentFootprint;
 else
 b = parentFootprint;
 
 if( m_constraintMap.count( aConstraintType ) )
 {
 std::vector<DRC_ENGINE_CONSTRAINT*>* ruleset = m_constraintMap[ aConstraintType ];
 
 for( int ii = 0; ii < (int) ruleset->size(); ++ii )
 processConstraint( ruleset->at( ii ) );
 
 if( constraint.GetParentRule() && !constraint.GetParentRule()->m_Implicit )
 return constraint;
 }
 }
 
 // Unfortunately implicit rules don't work for local clearances (such as zones) because
 // they have to be max'ed with netclass values (which are already implicit rules), and our
 // rule selection paradigm is "winner takes all".
 if( aConstraintType == CLEARANCE_CONSTRAINT )
 {
 int global = constraint.m_Value.Min();
 int clearance = global;
 bool needBlankLine = true;
 
 if( ac && ac->GetLocalClearance().has_value() )
 {
 int localA = ac->GetLocalClearance().value();
 
 if( needBlankLine )
 {
 REPORT( "" )
 needBlankLine = false;
 }
 
 REPORT( wxString::Format( _( "Local clearance on %s: %s." ),
 EscapeHTML( a->GetItemDescription( this, true ) ),
 MessageTextFromValue( localA ) ) )
 
 if( localA > clearance )
 {
 wxString msg;
 clearance = ac->GetLocalClearance( &msg ).value();
 constraint.SetParentRule( nullptr );
 constraint.SetName( msg );
 constraint.m_Value.SetMin( clearance );
 }
 }
 
 if( bc && bc->GetLocalClearance().has_value() )
 {
 int localB = bc->GetLocalClearance().value();
 
 if( needBlankLine )
 {
 REPORT( "" )
 needBlankLine = false;
 }
 
 REPORT( wxString::Format( _( "Local clearance on %s: %s." ),
 EscapeHTML( b->GetItemDescription( this, true ) ),
 MessageTextFromValue( localB ) ) )
 
 if( localB > clearance )
 {
 wxString msg;
 clearance = bc->GetLocalClearance( &msg ).value();
 constraint.SetParentRule( nullptr );
 constraint.SetName( msg );
 constraint.m_Value.SetMin( clearance );
 }
 }
 
 if( !a_is_non_copper && !b_is_non_copper )
 {
 if( needBlankLine )
 {
 REPORT( "" )
 needBlankLine = false;
 }
 
 REPORT( wxString::Format( _( "Board minimum clearance: %s." ),
 MessageTextFromValue( m_designSettings->m_MinClearance ) ) )
 
 if( clearance < m_designSettings->m_MinClearance )
 {
 constraint.SetParentRule( nullptr );
 constraint.SetName( _( "board minimum" ) );
 constraint.m_Value.SetMin( m_designSettings->m_MinClearance );
 }
 }
 
 return constraint;
 }
 else if( aConstraintType == DIFF_PAIR_GAP_CONSTRAINT )
 {
 REPORT( "" )
 REPORT( wxString::Format( _( "Board minimum clearance: %s." ),
 MessageTextFromValue( m_designSettings->m_MinClearance ) ) )
 
 if( constraint.m_Value.Min() < m_designSettings->m_MinClearance )
 {
 constraint.SetParentRule( nullptr );
 constraint.SetName( _( "board minimum" ) );
 constraint.m_Value.SetMin( m_designSettings->m_MinClearance );
 }
 
 return constraint;
 }
 else if( aConstraintType == ZONE_CONNECTION_CONSTRAINT )
 {
 if( pad && parentFootprint )
 {
 ZONE_CONNECTION local = parentFootprint->GetLocalZoneConnection();
 
 if( local != ZONE_CONNECTION::INHERITED )
 {
 REPORT( "" )
 REPORT( wxString::Format( _( "%s zone connection: %s." ),
 EscapeHTML( parentFootprint->GetItemDescription( this, true ) ),
 EscapeHTML( PrintZoneConnection( local ) ) ) )
 
 constraint.SetParentRule( nullptr );
 constraint.SetName( _( "footprint" ) );
 constraint.m_ZoneConnection = local;
 return constraint;
 }
 }
 
 if( zone )
 {
 ZONE_CONNECTION local = zone->GetPadConnection();
 
 REPORT( "" )
 REPORT( wxString::Format( _( "%s pad connection: %s." ),
 EscapeHTML( zone->GetItemDescription( this, true ) ),
 EscapeHTML( PrintZoneConnection( local ) ) ) )
 
 constraint.SetParentRule( nullptr );
 constraint.SetName( _( "zone" ) );
 constraint.m_ZoneConnection = local;
 return constraint;
 }
 }
 else if( aConstraintType == THERMAL_RELIEF_GAP_CONSTRAINT )
 {
 if( zone )
 {
 int local = zone->GetThermalReliefGap();
 
 REPORT( "" )
 REPORT( wxString::Format( _( "%s thermal relief gap: %s." ),
 EscapeHTML( zone->GetItemDescription( this, true ) ),
 EscapeHTML( MessageTextFromValue( local ) ) ) )
 
 constraint.SetParentRule( nullptr );
 constraint.SetName( _( "zone" ) );
 constraint.m_Value.SetMin( local );
 return constraint;
 }
 }
 else if( aConstraintType == THERMAL_SPOKE_WIDTH_CONSTRAINT )
 {
 if( zone )
 {
 int local = zone->GetThermalReliefSpokeWidth();
 
 REPORT( "" )
 REPORT( wxString::Format( _( "%s thermal spoke width: %s." ),
 EscapeHTML( zone->GetItemDescription( this, true ) ),
 EscapeHTML( MessageTextFromValue( local ) ) ) )
 
 constraint.SetParentRule( nullptr );
 constraint.SetName( _( "zone" ) );
 constraint.m_Value.SetMin( local );
 return constraint;
 }
 }
 
 if( !constraint.GetParentRule() )
 {
 constraint.m_Type = NULL_CONSTRAINT;
 constraint.m_DisallowFlags = 0;
 }
 
 return constraint;
}
 
 
void DRC_ENGINE::ProcessAssertions( const BOARD_ITEM* a,
 std::function<void( const DRC_CONSTRAINT* )> aFailureHandler,
 REPORTER* aReporter )
{
 /*
 * NOTE: all string manipulation MUST BE KEPT INSIDE the REPORT macro. It absolutely
 * kills performance when running bulk DRC tests (where aReporter is nullptr).
 */
 
 auto testAssertion =
 [&]( const DRC_ENGINE_CONSTRAINT* c )
 {
 REPORT( wxString::Format( _( "Checking rule assertion \"%s\"." ),
 EscapeHTML( c->constraint.m_Test->GetExpression() ) ) )
 
 if( c->constraint.m_Test->EvaluateFor( a, nullptr, c->constraint.m_Type,
 a->GetLayer(), aReporter ) )
 {
 REPORT( _( "Assertion passed." ) )
 }
 else
 {
 REPORT( EscapeHTML( _( "--> Assertion failed. <--" ) ) )
 aFailureHandler( &c->constraint );
 }
 };
 
 auto processConstraint =
 [&]( const DRC_ENGINE_CONSTRAINT* c )
 {
 REPORT( "" )
 REPORT( wxString::Format( _( "Checking %s." ), c->constraint.GetName() ) )
 
 if( !( a->GetLayerSet() & c->layerTest ).any() )
 {
 REPORT( wxString::Format( _( "Rule layer '%s' not matched; rule ignored." ),
 EscapeHTML( c->parentRule->m_LayerSource ) ) )
 }
 
 if( !c->condition || c->condition->GetExpression().IsEmpty() )
 {
 REPORT( _( "Unconditional rule applied." ) )
 testAssertion( c );
 }
 else
 {
 REPORT( wxString::Format( _( "Checking rule condition \"%s\"." ),
 EscapeHTML( c->condition->GetExpression() ) ) )
 
 if( c->condition->EvaluateFor( a, nullptr, c->constraint.m_Type,
 a->GetLayer(), aReporter ) )
 {
 REPORT( _( "Rule applied." ) )
 testAssertion( c );
 }
 else
 {
 REPORT( _( "Condition not satisfied; rule ignored." ) )
 }
 }
 };
 
 if( m_constraintMap.count( ASSERTION_CONSTRAINT ) )
 {
 std::vector<DRC_ENGINE_CONSTRAINT*>* ruleset = m_constraintMap[ ASSERTION_CONSTRAINT ];
 
 for( int ii = 0; ii < (int) ruleset->size(); ++ii )
 processConstraint( ruleset->at( ii ) );
 }
}
 
 
#undef REPORT
 
 
bool DRC_ENGINE::IsErrorLimitExceeded( int error_code )
{
 assert( error_code >= 0 && error_code <= DRCE_LAST );
 return m_errorLimits[ error_code ] <= 0;
}
 
 
void DRC_ENGINE::ReportViolation( const std::shared_ptr<DRC_ITEM>& aItem, const VECTOR2I& aPos,
 int aMarkerLayer )
{
 static std::mutex globalLock;
 
 m_errorLimits[ aItem->GetErrorCode() ] -= 1;
 
 if( m_violationHandler )
 {
 std::lock_guard<std::mutex> guard( globalLock );
 m_violationHandler( aItem, aPos, aMarkerLayer );
 }
 
 if( m_reporter )
 {
 wxString msg = wxString::Format( wxT( "Test '%s': %s (code %d)" ),
 aItem->GetViolatingTest()->GetName(),
 aItem->GetErrorMessage(),
 aItem->GetErrorCode() );
 
 DRC_RULE* rule = aItem->GetViolatingRule();
 
 if( rule )
 msg += wxString::Format( wxT( ", violating rule: '%s'" ), rule->m_Name );
 
 m_reporter->Report( msg );
 
 wxString violatingItemsStr = wxT( "Violating items: " );
 
 m_reporter->Report( wxString::Format( wxT( " |- violating position (%d, %d)" ),
 aPos.x,
 aPos.y ) );
 }
}
 
 
void DRC_ENGINE::ReportAux ( const wxString& aStr )
{
 if( !m_reporter )
 return;
 
 m_reporter->Report( aStr, RPT_SEVERITY_INFO );
}
 
 
bool DRC_ENGINE::KeepRefreshing( bool aWait )
{
 if( !m_progressReporter )
 return true;
 
 return m_progressReporter->KeepRefreshing( aWait );
}
 
 
void DRC_ENGINE::AdvanceProgress()
{
 if( m_progressReporter )
 m_progressReporter->AdvanceProgress();
}
 
 
void DRC_ENGINE::SetMaxProgress( int aSize )
{
 if( m_progressReporter )
 m_progressReporter->SetMaxProgress( aSize );
}
 
 
bool DRC_ENGINE::ReportProgress( double aProgress )
{
 if( !m_progressReporter )
 return true;
 
 m_progressReporter->SetCurrentProgress( aProgress );
 return m_progressReporter->KeepRefreshing( false );
}
 
 
bool DRC_ENGINE::ReportPhase( const wxString& aMessage )
{
 if( !m_progressReporter )
 return true;
 
 m_progressReporter->AdvancePhase( aMessage );
 return m_progressReporter->KeepRefreshing( false );
}
 
 
bool DRC_ENGINE::IsCancelled() const
{
 return m_progressReporter && m_progressReporter->IsCancelled();
}
 
 
bool DRC_ENGINE::HasRulesForConstraintType( DRC_CONSTRAINT_T constraintID )
{
 //drc_dbg(10,"hascorrect id %d size %d\n", ruleID, m_ruleMap[ruleID]->sortedRules.size( ) );
 if( m_constraintMap.count( constraintID ) )
 return m_constraintMap[ constraintID ]->size() > 0;
 
 return false;
}
 
 
bool DRC_ENGINE::QueryWorstConstraint( DRC_CONSTRAINT_T aConstraintId, DRC_CONSTRAINT& aConstraint )
{
 int worst = 0;
 
 if( m_constraintMap.count( aConstraintId ) )
 {
 for( DRC_ENGINE_CONSTRAINT* c : *m_constraintMap[aConstraintId] )
 {
 int current = c->constraint.GetValue().Min();
 
 if( current > worst )
 {
 worst = current;
 aConstraint = c->constraint;
 }
 }
 }
 
 return worst > 0;
}
 
 
std::set<int> DRC_ENGINE::QueryDistinctConstraints( DRC_CONSTRAINT_T aConstraintId )
{
 std::set<int> distinctMinimums;
 
 if( m_constraintMap.count( aConstraintId ) )
 {
 for( DRC_ENGINE_CONSTRAINT* c : *m_constraintMap[aConstraintId] )
 distinctMinimums.emplace( c->constraint.GetValue().Min() );
 }
 
 return distinctMinimums;
}
 
 
// fixme: move two functions below to pcbcommon?
int DRC_ENGINE::MatchDpSuffix( const wxString& aNetName, wxString& aComplementNet,
 wxString& aBaseDpName )
{
 int rv = 0;
 int count = 0;
 
 for( auto it = aNetName.rbegin(); it != aNetName.rend() && rv == 0; ++it, ++count )
 {
 int ch = *it;
 
 if( ( ch >= '0' && ch <= '9' ) || ch == '_' )
 {
 continue;
 }
 else if( ch == '+' )
 {
 aComplementNet = wxT( "-" );
 rv = 1;
 }
 else if( ch == '-' )
 {
 aComplementNet = wxT( "+" );
 rv = -1;
 }
 else if( ch == 'N' )
 {
 aComplementNet = wxT( "P" );
 rv = -1;
 }
 else if ( ch == 'P' )
 {
 aComplementNet = wxT( "N" );
 rv = 1;
 }
 else
 {
 break;
 }
 }
 
 if( rv != 0 && count >= 1 )
 {
 aBaseDpName = aNetName.Left( aNetName.Length() - count );
 aComplementNet = wxString( aBaseDpName ) << aComplementNet << aNetName.Right( count - 1 );
 }
 
 return rv;
}
 
 
bool DRC_ENGINE::IsNetADiffPair( BOARD* aBoard, NETINFO_ITEM* aNet, int& aNetP, int& aNetN )
{
 wxString refName = aNet->GetNetname();
 wxString dummy, coupledNetName;
 
 if( int polarity = MatchDpSuffix( refName, coupledNetName, dummy ) )
 {
 NETINFO_ITEM* net = aBoard->FindNet( coupledNetName );
 
 if( !net )
 return false;
 
 if( polarity > 0 )
 {
 aNetP = aNet->GetNetCode();
 aNetN = net->GetNetCode();
 }
 else
 {
 aNetP = net->GetNetCode();
 aNetN = aNet->GetNetCode();
 }
 
 return true;
 }
 
 return false;
}
 
 
bool DRC_ENGINE::IsNetTieExclusion( int aTrackNetCode, PCB_LAYER_ID aTrackLayer,
 const VECTOR2I& aCollisionPos, BOARD_ITEM* aCollidingItem )
{
 FOOTPRINT* parentFootprint = aCollidingItem->GetParentFootprint();
 
 if( parentFootprint && parentFootprint->IsNetTie() )
 {
 int epsilon = GetDesignSettings()->GetDRCEpsilon();
 std::map<wxString, int> padToNetTieGroupMap = parentFootprint->MapPadNumbersToNetTieGroups();
 
 for( PAD* pad : parentFootprint->Pads() )
 {
 if( padToNetTieGroupMap[ pad->GetNumber() ] >= 0 && aTrackNetCode == pad->GetNetCode() )
 {
 if( pad->GetEffectiveShape( aTrackLayer )->Collide( aCollisionPos, epsilon ) )
 return true;
 }
 }
 }
 
 return false;
}
 
 
DRC_TEST_PROVIDER* DRC_ENGINE::GetTestProvider( const wxString& name ) const
{
 for( DRC_TEST_PROVIDER* prov : m_testProviders )
 {
 if( name == prov->GetName() )
 return prov;
 }
 
 return nullptr;
}