pcb_expr_evaluator.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2019-2022 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 <cstdio>
#include <memory>
#include <board.h>
#include <board_design_settings.h>
#include <drc/drc_rtree.h>
#include <pcb_track.h>
#include <pcb_group.h>
#include <geometry/shape_segment.h>
#include <pcb_expr_evaluator.h>
#include <wx/log.h>
 
#include <connectivity/connectivity_data.h>
#include <connectivity/connectivity_algo.h>
#include <connectivity/from_to_cache.h>
 
#include <drc/drc_engine.h>
 
bool fromToFunc( LIBEVAL::CONTEXT* aCtx, void* self )
{
 PCB_EXPR_VAR_REF* vref = static_cast<PCB_EXPR_VAR_REF*>( self );
 BOARD_ITEM* item = vref ? vref->GetObject( aCtx ) : nullptr;
 LIBEVAL::VALUE* result = aCtx->AllocValue();
 
 LIBEVAL::VALUE* argTo = aCtx->Pop();
 LIBEVAL::VALUE* argFrom = aCtx->Pop();
 
 result->Set(0.0);
 aCtx->Push( result );
 
 if(!item)
 return false;
 
 auto ftCache = item->GetBoard()->GetConnectivity()->GetFromToCache();
 
 if( !ftCache )
 {
 wxLogWarning( wxT( "Attempting to call fromTo() with non-existent from-to cache." ) );
 return true;
 }
 
 if( ftCache->IsOnFromToPath( static_cast<BOARD_CONNECTED_ITEM*>( item ),
 argFrom->AsString(), argTo->AsString() ) )
 {
 result->Set(1.0);
 }
 
 return true;
}
 
 
#define MISSING_LAYER_ARG( f ) wxString::Format( _( "Missing layer name argument to %s." ), f )
 
static void existsOnLayerFunc( LIBEVAL::CONTEXT* aCtx, void *self )
{
 PCB_EXPR_VAR_REF* vref = static_cast<PCB_EXPR_VAR_REF*>( self );
 BOARD_ITEM* item = vref ? vref->GetObject( aCtx ) : nullptr;
 
 LIBEVAL::VALUE* arg = aCtx->Pop();
 LIBEVAL::VALUE* result = aCtx->AllocValue();
 
 result->Set( 0.0 );
 aCtx->Push( result );
 
 if( !item )
 return;
 
 if( !arg )
 {
 if( aCtx->HasErrorCallback() )
 aCtx->ReportError( MISSING_LAYER_ARG( wxT( "existsOnLayer()" ) ) );
 
 return;
 }
 
 result->SetDeferredEval(
 [item, arg, aCtx]() -> double
 {
 const wxString& layerName = arg->AsString();
 wxPGChoices& layerMap = ENUM_MAP<PCB_LAYER_ID>::Instance().Choices();
 
 if( aCtx->HasErrorCallback())
 {
 /*
 * Interpreted version
 */
 
 bool anyMatch = false;
 
 for( unsigned ii = 0; ii < layerMap.GetCount(); ++ii )
 {
 wxPGChoiceEntry& entry = layerMap[ ii ];
 
 if( entry.GetText().Matches( layerName ))
 {
 anyMatch = true;
 
 if( item->IsOnLayer( ToLAYER_ID( entry.GetValue())))
 return 1.0;
 }
 }
 
 if( !anyMatch )
 {
 aCtx->ReportError( wxString::Format( _( "Unrecognized layer '%s'" ),
 layerName ) );
 }
 }
 else
 {
 /*
 * Compiled version
 */
 
 BOARD* board = item->GetBoard();
 std::unique_lock<std::mutex> cacheLock( board->m_CachesMutex );
 auto i = board->m_LayerExpressionCache.find( layerName );
 LSET mask;
 
 if( i == board->m_LayerExpressionCache.end() )
 {
 for( unsigned ii = 0; ii < layerMap.GetCount(); ++ii )
 {
 wxPGChoiceEntry& entry = layerMap[ ii ];
 
 if( entry.GetText().Matches( layerName ) )
 mask.set( ToLAYER_ID( entry.GetValue() ) );
 }
 
 board->m_LayerExpressionCache[ layerName ] = mask;
 }
 else
 {
 mask = i->second;
 }
 
 if( ( item->GetLayerSet() & mask ).any() )
 return 1.0;
 }
 
 return 0.0;
 } );
}
 
 
static void isPlatedFunc( LIBEVAL::CONTEXT* aCtx, void* self )
{
 LIBEVAL::VALUE* result = aCtx->AllocValue();
 
 result->Set( 0.0 );
 aCtx->Push( result );
 
 PCB_EXPR_VAR_REF* vref = static_cast<PCB_EXPR_VAR_REF*>( self );
 BOARD_ITEM* item = vref ? vref->GetObject( aCtx ) : nullptr;
 
 if( !item )
 return;
 
 if( item->Type() == PCB_PAD_T && static_cast<PAD*>( item )->GetAttribute() == PAD_ATTRIB::PTH )
 result->Set( 1.0 );
 else if( item->Type() == PCB_VIA_T )
 result->Set( 1.0 );
}
 
 
bool collidesWithCourtyard( BOARD_ITEM* aItem, std::shared_ptr<SHAPE>& aItemShape,
 PCB_EXPR_CONTEXT* aCtx, FOOTPRINT* aFootprint, PCB_LAYER_ID aSide )
{
 SHAPE_POLY_SET footprintCourtyard;
 
 footprintCourtyard = aFootprint->GetCourtyard( aSide );
 
 if( !aItemShape )
 {
 // Since rules are used for zone filling we can't rely on the filled shapes.
 // Use the zone outline instead.
 if( ZONE* zone = dynamic_cast<ZONE*>( aItem ) )
 aItemShape.reset( zone->Outline()->Clone() );
 else
 aItemShape = aItem->GetEffectiveShape( aCtx->GetLayer() );
 }
 
 return footprintCourtyard.Collide( aItemShape.get() );
};
 
 
static bool searchFootprints( BOARD* aBoard, const wxString& aArg, PCB_EXPR_CONTEXT* aCtx,
 std::function<bool( FOOTPRINT* )> aFunc )
{
 if( aArg == wxT( "A" ) )
 {
 FOOTPRINT* fp = dynamic_cast<FOOTPRINT*>( aCtx->GetItem( 0 ) );
 
 if( fp && aFunc( fp ) )
 return 1.0;
 }
 else if( aArg == wxT( "B" ) )
 {
 FOOTPRINT* fp = dynamic_cast<FOOTPRINT*>( aCtx->GetItem( 1 ) );
 
 if( fp && aFunc( fp ) )
 return 1.0;
 }
 else for( FOOTPRINT* fp : aBoard->Footprints() )
 {
 if( fp->GetReference().Matches( aArg ) )
 {
 if( aFunc( fp ) )
 return 1.0;
 }
 }
 
 return 0.0;
}
 
 
#define MISSING_FP_ARG( f ) \
 wxString::Format( _( "Missing footprint argument (A, B, or reference designator) to %s." ), f )
 
static void intersectsCourtyardFunc( LIBEVAL::CONTEXT* aCtx, void* self )
{
 PCB_EXPR_CONTEXT* context = static_cast<PCB_EXPR_CONTEXT*>( aCtx );
 LIBEVAL::VALUE* arg = context->Pop();
 LIBEVAL::VALUE* result = context->AllocValue();
 
 result->Set( 0.0 );
 context->Push( result );
 
 if( !arg )
 {
 if( context->HasErrorCallback() )
 context->ReportError( MISSING_FP_ARG( wxT( "intersectsCourtyard()" ) ) );
 
 return;
 }
 
 PCB_EXPR_VAR_REF* vref = static_cast<PCB_EXPR_VAR_REF*>( self );
 BOARD_ITEM* item = vref ? vref->GetObject( context ) : nullptr;
 
 if( !item )
 return;
 
 result->SetDeferredEval(
 [item, arg, context]() -> double
 {
 BOARD* board = item->GetBoard();
 std::shared_ptr<SHAPE> itemShape;
 
 if( searchFootprints( board, arg->AsString(), context,
 [&]( FOOTPRINT* fp )
 {
 PTR_PTR_CACHE_KEY key = { fp, item };
 std::unique_lock<std::mutex> cacheLock( board->m_CachesMutex );
 
 auto i = board->m_IntersectsCourtyardCache.find( key );
 
 if( i != board->m_IntersectsCourtyardCache.end() )
 return i->second;
 
 bool res = collidesWithCourtyard( item, itemShape, context, fp, F_Cu )
 || collidesWithCourtyard( item, itemShape, context, fp, B_Cu );
 
 board->m_IntersectsCourtyardCache[ key ] = res;
 return res;
 } ) )
 {
  return 1.0;
 }
 
 return 0.0;
 } );
}
 
 
static void intersectsFrontCourtyardFunc( LIBEVAL::CONTEXT* aCtx, void* self )
{
 PCB_EXPR_CONTEXT* context = static_cast<PCB_EXPR_CONTEXT*>( aCtx );
 LIBEVAL::VALUE* arg = context->Pop();
 LIBEVAL::VALUE* result = context->AllocValue();
 
 result->Set( 0.0 );
 context->Push( result );
 
 if( !arg )
 {
 if( context->HasErrorCallback() )
 context->ReportError( MISSING_FP_ARG( wxT( "intersectsFrontCourtyard()" ) ) );
 
 return;
 }
 
 PCB_EXPR_VAR_REF* vref = static_cast<PCB_EXPR_VAR_REF*>( self );
 BOARD_ITEM* item = vref ? vref->GetObject( context ) : nullptr;
 
 if( !item )
 return;
 
 result->SetDeferredEval(
 [item, arg, context]() -> double
 {
 BOARD* board = item->GetBoard();
 std::shared_ptr<SHAPE> itemShape;
 
 if( searchFootprints( board, arg->AsString(), context,
 [&]( FOOTPRINT* fp )
 {
 PTR_PTR_CACHE_KEY key = { fp, item };
 std::unique_lock<std::mutex> cacheLock( board->m_CachesMutex );
 
 auto i = board->m_IntersectsFCourtyardCache.find( key );
 
 if( i != board->m_IntersectsFCourtyardCache.end() )
 return i->second;
 
 bool res = collidesWithCourtyard( item, itemShape, context, fp, F_Cu );
 
 board->m_IntersectsFCourtyardCache[ key ] = res;
 return res;
 } ) )
 {
 return 1.0;
 }
 
 return 0.0;
 } );
}
 
 
static void intersectsBackCourtyardFunc( LIBEVAL::CONTEXT* aCtx, void* self )
{
 PCB_EXPR_CONTEXT* context = static_cast<PCB_EXPR_CONTEXT*>( aCtx );
 LIBEVAL::VALUE* arg = context->Pop();
 LIBEVAL::VALUE* result = context->AllocValue();
 
 result->Set( 0.0 );
 context->Push( result );
 
 if( !arg )
 {
 if( context->HasErrorCallback() )
 context->ReportError( MISSING_FP_ARG( wxT( "intersectsBackCourtyard()" ) ) );
 
 return;
 }
 
 PCB_EXPR_VAR_REF* vref = static_cast<PCB_EXPR_VAR_REF*>( self );
 BOARD_ITEM* item = vref ? vref->GetObject( context ) : nullptr;
 
 if( !item )
 return;
 
 result->SetDeferredEval(
 [item, arg, context]() -> double
 {
 BOARD* board = item->GetBoard();
 std::shared_ptr<SHAPE> itemShape;
 
 if( searchFootprints( board, arg->AsString(), context,
 [&]( FOOTPRINT* fp )
 {
 PTR_PTR_CACHE_KEY key = { fp, item };
 std::unique_lock<std::mutex> cacheLock( board->m_CachesMutex );
 
 auto i = board->m_IntersectsBCourtyardCache.find( key );
 
 if( i != board->m_IntersectsBCourtyardCache.end() )
 return i->second;
 
 bool res = collidesWithCourtyard( item, itemShape, context, fp, B_Cu );
 
 board->m_IntersectsBCourtyardCache[ key ] = res;
 return res;
 } ) )
 {
 return 1.0;
 }
 
 return 0.0;
 } );
}
 
 
bool collidesWithArea( BOARD_ITEM* aItem, PCB_EXPR_CONTEXT* aCtx, ZONE* aArea )
{
 BOARD* board = aArea->GetBoard();
 BOX2I areaBBox = aArea->GetBoundingBox();
 std::shared_ptr<SHAPE> shape;
 
 // Collisions include touching, so we need to deflate outline by enough to exclude it.
 // This is particularly important for detecting copper fills as they will be exactly
 // touching along the entire exclusion border.
 SHAPE_POLY_SET areaOutline = aArea->Outline()->CloneDropTriangulation();
 areaOutline.Deflate( board->GetDesignSettings().GetDRCEpsilon(), 0,
 SHAPE_POLY_SET::ALLOW_ACUTE_CORNERS );
 
 if( aItem->GetFlags() & HOLE_PROXY )
 {
 if( aItem->Type() == PCB_PAD_T )
 {
 return areaOutline.Collide( aItem->GetEffectiveHoleShape().get() );
 }
 else if( aItem->Type() == PCB_VIA_T )
 {
 LSET overlap = aItem->GetLayerSet() & aArea->GetLayerSet();
 
 if( overlap.any() )
 {
 if( aCtx->GetLayer() == UNDEFINED_LAYER || overlap.Contains( aCtx->GetLayer() ) )
 return areaOutline.Collide( aItem->GetEffectiveHoleShape().get() );
 }
 }
 
 return false;
 }
 
 if( aItem->Type() == PCB_FOOTPRINT_T )
 {
 FOOTPRINT* footprint = static_cast<FOOTPRINT*>( aItem );
 
 if( ( footprint->GetFlags() & MALFORMED_COURTYARDS ) != 0 )
 {
 if( aCtx->HasErrorCallback() )
 aCtx->ReportError( _( "Footprint's courtyard is not a single, closed shape." ) );
 
 return false;
 }
 
 if( ( aArea->GetLayerSet() & LSET::FrontMask() ).any() )
 {
 const SHAPE_POLY_SET& courtyard = footprint->GetCourtyard( F_CrtYd );
 
 if( courtyard.OutlineCount() == 0 )
 {
 if( aCtx->HasErrorCallback() )
 aCtx->ReportError( _( "Footprint has no front courtyard." ) );
 
 return false;
 }
 else
 {
 return areaOutline.Collide( &courtyard.Outline( 0 ) );
 }
 }
 
 if( ( aArea->GetLayerSet() & LSET::BackMask() ).any() )
 {
 const SHAPE_POLY_SET& courtyard = footprint->GetCourtyard( B_CrtYd );
 
 if( courtyard.OutlineCount() == 0 )
 {
 if( aCtx->HasErrorCallback() )
 aCtx->ReportError( _( "Footprint has no back courtyard." ) );
 
 return false;
 }
 else
 {
 return areaOutline.Collide( &courtyard.Outline( 0 ) );
 }
 }
 
 return false;
 }
 
 if( aItem->Type() == PCB_ZONE_T || aItem->Type() == PCB_FP_ZONE_T )
 {
 ZONE* zone = static_cast<ZONE*>( aItem );
 
 if( !zone->IsFilled() )
 return false;
 
 DRC_RTREE* zoneRTree = board->m_CopperZoneRTreeCache[ zone ].get();
 
 if( zoneRTree )
 {
 for( PCB_LAYER_ID layer : aArea->GetLayerSet().Seq() )
 {
 if( aCtx->GetLayer() == layer || aCtx->GetLayer() == UNDEFINED_LAYER )
 {
 if( zoneRTree->QueryColliding( areaBBox, &areaOutline, layer ) )
 return true;
 }
 }
 }
 
 return false;
 }
 else
 {
 PCB_LAYER_ID layer = aCtx->GetLayer();
 
 if( layer != UNDEFINED_LAYER && !( aArea->GetLayerSet().Contains( layer ) ) )
 return false;
 
 if( !shape )
 shape = aItem->GetEffectiveShape( layer );
 
 return areaOutline.Collide( shape.get() );
 }
}
 
 
bool searchAreas( BOARD* aBoard, const wxString& aArg, PCB_EXPR_CONTEXT* aCtx,
 std::function<bool( ZONE* )> aFunc )
{
 if( aArg == wxT( "A" ) )
 {
 return aFunc( dynamic_cast<ZONE*>( aCtx->GetItem( 0 ) ) );
 }
 else if( aArg == wxT( "B" ) )
 {
 return aFunc( dynamic_cast<ZONE*>( aCtx->GetItem( 1 ) ) );
 }
 else if( KIID::SniffTest( aArg ) )
 {
 KIID target( aArg );
 
 for( ZONE* area : aBoard->Zones() )
 {
 // Only a single zone can match the UUID; exit once we find a match whether
 // "inside" or not
 if( area->m_Uuid == target )
 return aFunc( area );
 }
 
 for( FOOTPRINT* footprint : aBoard->Footprints() )
 {
 for( ZONE* area : footprint->Zones() )
 {
 // Only a single zone can match the UUID; exit once we find a match
 // whether "inside" or not
 if( area->m_Uuid == target )
 return aFunc( area );
 }
 }
 
 return 0.0;
 }
 else // Match on zone name
 {
 for( ZONE* area : aBoard->Zones() )
 {
 if( area->GetZoneName().Matches( aArg ) )
 {
 // Many zones can match the name; exit only when we find an "inside"
 if( aFunc( area ) )
 return true;
 }
 }
 
 for( FOOTPRINT* footprint : aBoard->Footprints() )
 {
 for( ZONE* area : footprint->Zones() )
 {
 // Many zones can match the name; exit only when we find an "inside"
 if( area->GetZoneName().Matches( aArg ) )
 {
 if( aFunc( area ) )
 return true;
 }
 }
 }
 
 return false;
 }
}
 
 
#define MISSING_AREA_ARG( f ) \
 wxString::Format( _( "Missing rule-area argument (A, B, or rule-area name) to %s." ), f )
 
static void intersectsAreaFunc( LIBEVAL::CONTEXT* aCtx, void* self )
{
 PCB_EXPR_CONTEXT* context = static_cast<PCB_EXPR_CONTEXT*>( aCtx );
 LIBEVAL::VALUE* arg = aCtx->Pop();
 LIBEVAL::VALUE* result = aCtx->AllocValue();
 
 result->Set( 0.0 );
 aCtx->Push( result );
 
 if( !arg )
 {
 if( aCtx->HasErrorCallback() )
 aCtx->ReportError( MISSING_AREA_ARG( wxT( "intersectsArea()" ) ) );
 
 return;
 }
 
 PCB_EXPR_VAR_REF* vref = static_cast<PCB_EXPR_VAR_REF*>( self );
 BOARD_ITEM* item = vref ? vref->GetObject( context ) : nullptr;
 
 if( !item )
 return;
 
 result->SetDeferredEval(
 [item, arg, context]() -> double
 {
 BOARD* board = item->GetBoard();
 PCB_LAYER_ID layer = context->GetLayer();
 BOX2I itemBBox = item->GetBoundingBox();
 
 if( searchAreas( board, arg->AsString(), context,
 [&]( ZONE* aArea )
 {
 if( !aArea || aArea == item || aArea->GetParent() == item )
 return false;
 
 if( !aArea->GetBoundingBox().Intersects( itemBBox ) )
 return false;
 
 std::unique_lock<std::mutex> cacheLock( board->m_CachesMutex );
 PTR_PTR_LAYER_CACHE_KEY key = { aArea, item, layer };
 
 auto i = board->m_IntersectsAreaCache.find( key );
 
 if( i != board->m_IntersectsAreaCache.end() )
 return i->second;
 
 bool collides = collidesWithArea( item, context, aArea );
 
 board->m_IntersectsAreaCache[ key ] = collides;
 
 return collides;
 } ) )
 {
 return 1.0;
 }
 
 return 0.0;
 } );
}
 
 
static void enclosedByAreaFunc( LIBEVAL::CONTEXT* aCtx, void* self )
{
 PCB_EXPR_CONTEXT* context = static_cast<PCB_EXPR_CONTEXT*>( aCtx );
 LIBEVAL::VALUE* arg = aCtx->Pop();
 LIBEVAL::VALUE* result = aCtx->AllocValue();
 
 result->Set( 0.0 );
 aCtx->Push( result );
 
 if( !arg )
 {
 if( aCtx->HasErrorCallback() )
 aCtx->ReportError( MISSING_AREA_ARG( wxT( "enclosedByArea()" ) ) );
 
 return;
 }
 
 PCB_EXPR_VAR_REF* vref = static_cast<PCB_EXPR_VAR_REF*>( self );
 BOARD_ITEM* item = vref ? vref->GetObject( context ) : nullptr;
 
 if( !item )
 return;
 
 result->SetDeferredEval(
 [item, arg, context]() -> double
 {
 BOARD* board = item->GetBoard();
 int maxError = board->GetDesignSettings().m_MaxError;
 PCB_LAYER_ID layer = context->GetLayer();
 BOX2I itemBBox = item->GetBoundingBox();
 
 if( searchAreas( board, arg->AsString(), context,
 [&]( ZONE* aArea )
 {
 if( !aArea || aArea == item || aArea->GetParent() == item )
 return false;
 
 if( !aArea->GetBoundingBox().Intersects( itemBBox ) )
 return false;
 
 std::unique_lock<std::mutex> cacheLock( board->m_CachesMutex );
 PTR_PTR_LAYER_CACHE_KEY key = { aArea, item, layer };
 
 auto i = board->m_EnclosedByAreaCache.find( key );
 
 if( i != board->m_EnclosedByAreaCache.end() )
 return i->second;
 
 SHAPE_POLY_SET itemShape;
 bool enclosedByArea;
 
 item->TransformShapeWithClearanceToPolygon( itemShape, layer, 0,
 maxError, ERROR_OUTSIDE );
 
 if( itemShape.IsEmpty() )
 {
 // If it's already empty then our test will have no meaning.
 enclosedByArea = false;
 }
 else
 {
 itemShape.BooleanSubtract( *aArea->Outline(),
 SHAPE_POLY_SET::PM_FAST );
 
 enclosedByArea = itemShape.IsEmpty();
 }
 
 board->m_EnclosedByAreaCache[ key ] = enclosedByArea;
 
 return enclosedByArea;
 } ) )
 {
 return 1.0;
 }
 
 return 0.0;
 } );
}
 
 
#define MISSING_GROUP_ARG( f ) \
 wxString::Format( _( "Missing group name argument to %s." ), f )
 
static void memberOfFunc( LIBEVAL::CONTEXT* aCtx, void* self )
{
 LIBEVAL::VALUE* arg = aCtx->Pop();
 LIBEVAL::VALUE* result = aCtx->AllocValue();
 
 result->Set( 0.0 );
 aCtx->Push( result );
 
 if( !arg )
 {
 if( aCtx->HasErrorCallback() )
 aCtx->ReportError( MISSING_GROUP_ARG( wxT( "memberOf()" ) ) );
 
 return;
 }
 
 PCB_EXPR_VAR_REF* vref = static_cast<PCB_EXPR_VAR_REF*>( self );
 BOARD_ITEM* item = vref ? vref->GetObject( aCtx ) : nullptr;
 
 if( !item )
 return;
 
 result->SetDeferredEval(
 [item, arg]() -> double
 {
 PCB_GROUP* group = item->GetParentGroup();
 
 if( !group && item->GetParent() && item->GetParent()->Type() == PCB_FOOTPRINT_T )
 group = item->GetParent()->GetParentGroup();
 
 while( group )
 {
 if( group->GetName().Matches( arg->AsString() ) )
 return 1.0;
 
 group = group->GetParentGroup();
 }
 
 return 0.0;
 } );
}
 
 
static void isMicroVia( LIBEVAL::CONTEXT* aCtx, void* self )
{
 PCB_EXPR_VAR_REF* vref = static_cast<PCB_EXPR_VAR_REF*>( self );
 BOARD_ITEM* item = vref ? vref->GetObject( aCtx ) : nullptr;
 LIBEVAL::VALUE* result = aCtx->AllocValue();
 
 result->Set( 0.0 );
 aCtx->Push( result );
 
 PCB_VIA* via = dyn_cast<PCB_VIA*>( item );
 
 if( via && via->GetViaType() == VIATYPE::MICROVIA )
 result->Set ( 1.0 );
}
 
 
static void isBlindBuriedViaFunc( LIBEVAL::CONTEXT* aCtx, void* self )
{
 PCB_EXPR_VAR_REF* vref = static_cast<PCB_EXPR_VAR_REF*>( self );
 BOARD_ITEM* item = vref ? vref->GetObject( aCtx ) : nullptr;
 LIBEVAL::VALUE* result = aCtx->AllocValue();
 
 result->Set( 0.0 );
 aCtx->Push( result );
 
 PCB_VIA* via = dyn_cast<PCB_VIA*>( item );
 
 if( via && via->GetViaType() == VIATYPE::BLIND_BURIED )
 result->Set ( 1.0 );
}
 
 
static void isCoupledDiffPairFunc( LIBEVAL::CONTEXT* aCtx, void* self )
{
 PCB_EXPR_CONTEXT* context = static_cast<PCB_EXPR_CONTEXT*>( aCtx );
 BOARD_CONNECTED_ITEM* a = dynamic_cast<BOARD_CONNECTED_ITEM*>( context->GetItem( 0 ) );
 BOARD_CONNECTED_ITEM* b = dynamic_cast<BOARD_CONNECTED_ITEM*>( context->GetItem( 1 ) );
 LIBEVAL::VALUE* result = aCtx->AllocValue();
 
 result->Set( 0.0 );
 aCtx->Push( result );
 
 result->SetDeferredEval(
 [a, b, context]() -> double
 {
 NETINFO_ITEM* netinfo = a ? a->GetNet() : nullptr;
 
 if( !netinfo )
 return 0.0;
 
 wxString coupledNet;
 wxString dummy;
 
 if( !DRC_ENGINE::MatchDpSuffix( netinfo->GetNetname(), coupledNet, dummy ) )
 return 0.0;
 
 if( context->GetConstraint() == DRC_CONSTRAINT_T::LENGTH_CONSTRAINT
 || context->GetConstraint() == DRC_CONSTRAINT_T::SKEW_CONSTRAINT )
 {
 // DRC engine evaluates these singly, so we won't have a B item
 return 1.0;
 }
 
 return b && b->GetNetname() == coupledNet;
 } );
}
 
 
#define MISSING_DP_ARG( f ) \
 wxString::Format( _( "Missing diff-pair name argument to %s." ), f )
 
static void inDiffPairFunc( LIBEVAL::CONTEXT* aCtx, void* self )
{
 LIBEVAL::VALUE* argv = aCtx->Pop();
 PCB_EXPR_VAR_REF* vref = static_cast<PCB_EXPR_VAR_REF*>( self );
 BOARD_ITEM* item = vref ? vref->GetObject( aCtx ) : nullptr;
 LIBEVAL::VALUE* result = aCtx->AllocValue();
 
 result->Set( 0.0 );
 aCtx->Push( result );
 
 if( !argv )
 {
 if( aCtx->HasErrorCallback() )
 aCtx->ReportError( MISSING_DP_ARG( wxT( "inDiffPair()" ) ) );
 
 return;
 }
 
 if( !item || !item->GetBoard() )
 return;
 
 result->SetDeferredEval(
 [item, argv]() -> double
 {
 if( item && item->IsConnected() )
 {
 NETINFO_ITEM* netinfo = static_cast<BOARD_CONNECTED_ITEM*>( item )->GetNet();
 
 wxString refName = netinfo->GetNetname();
 wxString arg = argv->AsString();
 wxString baseName, coupledNet;
 int polarity = DRC_ENGINE::MatchDpSuffix( refName, coupledNet, baseName );
 
 if( polarity != 0 && item->GetBoard()->FindNet( coupledNet ) )
 {
 if( baseName.Matches( arg ) )
 return 1.0;
 
 if( baseName.EndsWith( "_" ) && baseName.BeforeLast( '_' ).Matches( arg ) )
 return 1.0;
 }
 }
 
 return 0.0;
 } );
}
 
 
static void getFieldFunc( LIBEVAL::CONTEXT* aCtx, void* self )
{
 LIBEVAL::VALUE* arg = aCtx->Pop();
 PCB_EXPR_VAR_REF* vref = static_cast<PCB_EXPR_VAR_REF*>( self );
 BOARD_ITEM* item = vref ? vref->GetObject( aCtx ) : nullptr;
 LIBEVAL::VALUE* result = aCtx->AllocValue();
 
 result->Set( "" );
 aCtx->Push( result );
 
 if( !arg )
 {
 if( aCtx->HasErrorCallback() )
 {
 aCtx->ReportError( wxString::Format( _( "Missing field name argument to %s." ),
 wxT( "getField()" ) ) );
 }
 
 return;
 }
 
 if( !item || !item->GetBoard() )
 return;
 
 result->SetDeferredEval(
 [item, arg]() -> wxString
 {
 if( item && item->Type() == PCB_FOOTPRINT_T )
 {
 FOOTPRINT* fp = static_cast<FOOTPRINT*>( item );
 
 if( fp->HasProperty( arg->AsString() ) )
 return fp->GetProperty( arg->AsString() );
 }
 
 return "";
 } );
}
 
 
PCB_EXPR_BUILTIN_FUNCTIONS::PCB_EXPR_BUILTIN_FUNCTIONS()
{
 RegisterAllFunctions();
}
 
 
void PCB_EXPR_BUILTIN_FUNCTIONS::RegisterAllFunctions()
{
 m_funcs.clear();
 
 RegisterFunc( wxT( "existsOnLayer('x')" ), existsOnLayerFunc );
 
 RegisterFunc( wxT( "isPlated()" ), isPlatedFunc );
 
 RegisterFunc( wxT( "insideCourtyard('x') DEPRECATED" ), intersectsCourtyardFunc );
 RegisterFunc( wxT( "insideFrontCourtyard('x') DEPRECATED" ), intersectsFrontCourtyardFunc );
 RegisterFunc( wxT( "insideBackCourtyard('x') DEPRECATED" ), intersectsBackCourtyardFunc );
 RegisterFunc( wxT( "intersectsCourtyard('x')" ), intersectsCourtyardFunc );
 RegisterFunc( wxT( "intersectsFrontCourtyard('x')" ), intersectsFrontCourtyardFunc );
 RegisterFunc( wxT( "intersectsBackCourtyard('x')" ), intersectsBackCourtyardFunc );
 
 RegisterFunc( wxT( "insideArea('x') DEPRECATED" ), intersectsAreaFunc );
 RegisterFunc( wxT( "intersectsArea('x')" ), intersectsAreaFunc );
 RegisterFunc( wxT( "enclosedByArea('x')" ), enclosedByAreaFunc );
 
 RegisterFunc( wxT( "isMicroVia()" ), isMicroVia );
 RegisterFunc( wxT( "isBlindBuriedVia()" ), isBlindBuriedViaFunc );
 
 RegisterFunc( wxT( "memberOf('x')" ), memberOfFunc );
 
 RegisterFunc( wxT( "fromTo('x','y')" ), fromToFunc );
 RegisterFunc( wxT( "isCoupledDiffPair()" ), isCoupledDiffPairFunc );
 RegisterFunc( wxT( "inDiffPair('x')" ), inDiffPairFunc );
 
 RegisterFunc( wxT( "getField('x')" ), getFieldFunc );
}
 
 
BOARD_ITEM* PCB_EXPR_VAR_REF::GetObject( const LIBEVAL::CONTEXT* aCtx ) const
{
 wxASSERT( dynamic_cast<const PCB_EXPR_CONTEXT*>( aCtx ) );
 
 const PCB_EXPR_CONTEXT* ctx = static_cast<const PCB_EXPR_CONTEXT*>( aCtx );
 BOARD_ITEM* item = ctx->GetItem( m_itemIndex );
 return item;
}
 
 
class PCB_LAYER_VALUE : public LIBEVAL::VALUE
{
public:
 PCB_LAYER_VALUE( PCB_LAYER_ID aLayer ) :
 LIBEVAL::VALUE( LayerName( aLayer ) ),
 m_layer( aLayer )
 {};
 
 virtual bool EqualTo( LIBEVAL::CONTEXT* aCtx, const VALUE* b ) const override
 {
 // For boards with user-defined layer names there will be 2 entries for each layer
 // in the ENUM_MAP: one for the canonical layer name and one for the user layer name.
 // We need to check against both.
 
 wxPGChoices& layerMap = ENUM_MAP<PCB_LAYER_ID>::Instance().Choices();
 const wxString& layerName = b->AsString();
 BOARD* board = static_cast<PCB_EXPR_CONTEXT*>( aCtx )->GetBoard();
 std::unique_lock<std::mutex> cacheLock( board->m_CachesMutex );
 auto i = board->m_LayerExpressionCache.find( layerName );
 LSET mask;
 
 if( i == board->m_LayerExpressionCache.end() )
 {
 for( unsigned ii = 0; ii < layerMap.GetCount(); ++ii )
 {
 wxPGChoiceEntry& entry = layerMap[ii];
 
 if( entry.GetText().Matches( layerName ) )
 mask.set( ToLAYER_ID( entry.GetValue() ) );
 }
 
 board->m_LayerExpressionCache[ layerName ] = mask;
 }
 else
 {
 mask = i->second;
 }
 
 return mask.Contains( m_layer );
 }
 
protected:
 PCB_LAYER_ID m_layer;
};
 
 
LIBEVAL::VALUE* PCB_EXPR_VAR_REF::GetValue( LIBEVAL::CONTEXT* aCtx )
{
 PCB_EXPR_CONTEXT* context = static_cast<PCB_EXPR_CONTEXT*>( aCtx );
 
 if( m_itemIndex == 2 )
 return new PCB_LAYER_VALUE( context->GetLayer() );
 
 BOARD_ITEM* item = GetObject( aCtx );
 
 if( !item )
 return new LIBEVAL::VALUE();
 
 auto it = m_matchingTypes.find( TYPE_HASH( *item ) );
 
 if( it == m_matchingTypes.end() )
 {
 // Don't force user to type "A.Type == 'via' && A.Via_Type == 'buried'" when the
 // simpler "A.Via_Type == 'buried'" is perfectly clear. Instead, return an undefined
 // value when the property doesn't appear on a particular object.
 
 return new LIBEVAL::VALUE();
 }
 else
 {
 if( m_type == LIBEVAL::VT_NUMERIC )
 return new LIBEVAL::VALUE( (double) item->Get<int>( it->second ) );
 else
 {
 wxString str;
 
 if( !m_isEnum )
 {
 str = item->Get<wxString>( it->second );
 return new LIBEVAL::VALUE( str );
 }
 else
 {
 const wxAny& any = item->Get( it->second );
 bool valid = any.GetAs<wxString>( &str );
 
 if( valid )
 {
 if( it->second->Name() == wxT( "Layer" ) )
 return new PCB_LAYER_VALUE( context->GetBoard()->GetLayerID( str ) );
 else
 return new LIBEVAL::VALUE( str );
 }
 }
 
 return new LIBEVAL::VALUE();
 }
 }
}
 
 
LIBEVAL::VALUE* PCB_EXPR_NETCLASS_REF::GetValue( LIBEVAL::CONTEXT* aCtx )
{
 BOARD_CONNECTED_ITEM* item = dynamic_cast<BOARD_CONNECTED_ITEM*>( GetObject( aCtx ) );
 
 if( !item )
 return new LIBEVAL::VALUE();
 
 return new LIBEVAL::VALUE( item->GetEffectiveNetClass()->GetName() );
}
 
 
LIBEVAL::VALUE* PCB_EXPR_NETNAME_REF::GetValue( LIBEVAL::CONTEXT* aCtx )
{
 BOARD_CONNECTED_ITEM* item = dynamic_cast<BOARD_CONNECTED_ITEM*>( GetObject( aCtx ) );
 
 if( !item )
 return new LIBEVAL::VALUE();
 
 return new LIBEVAL::VALUE( item->GetNetname() );
}
 
 
LIBEVAL::VALUE* PCB_EXPR_TYPE_REF::GetValue( LIBEVAL::CONTEXT* aCtx )
{
 BOARD_ITEM* item = GetObject( aCtx );
 
 if( !item )
 return new LIBEVAL::VALUE();
 
 return new LIBEVAL::VALUE( ENUM_MAP<KICAD_T>::Instance().ToString( item->Type() ) );
}
 
 
LIBEVAL::FUNC_CALL_REF PCB_EXPR_UCODE::CreateFuncCall( const wxString& aName )
{
 PCB_EXPR_BUILTIN_FUNCTIONS& registry = PCB_EXPR_BUILTIN_FUNCTIONS::Instance();
 
 return registry.Get( aName.Lower() );
}
 
 
std::unique_ptr<LIBEVAL::VAR_REF> PCB_EXPR_UCODE::CreateVarRef( const wxString& aVar,
 const wxString& aField )
{
 PROPERTY_MANAGER& propMgr = PROPERTY_MANAGER::Instance();
 std::unique_ptr<PCB_EXPR_VAR_REF> vref;
 
 // Check for a couple of very common cases and compile them straight to "object code".
 
 if( aField.CmpNoCase( wxT( "NetClass" ) ) == 0 )
 {
 if( aVar == wxT( "A" ) )
 return std::make_unique<PCB_EXPR_NETCLASS_REF>( 0 );
 else if( aVar == wxT( "B" ) )
 return std::make_unique<PCB_EXPR_NETCLASS_REF>( 1 );
 else
 return nullptr;
 }
 else if( aField.CmpNoCase( wxT( "NetName" ) ) == 0 )
 {
 if( aVar == wxT( "A" ) )
 return std::make_unique<PCB_EXPR_NETNAME_REF>( 0 );
 else if( aVar == wxT( "B" ) )
 return std::make_unique<PCB_EXPR_NETNAME_REF>( 1 );
 else
 return nullptr;
 }
 else if( aField.CmpNoCase( wxT( "Type" ) ) == 0 )
 {
 if( aVar == wxT( "A" ) )
 return std::make_unique<PCB_EXPR_TYPE_REF>( 0 );
 else if( aVar == wxT( "B" ) )
 return std::make_unique<PCB_EXPR_TYPE_REF>( 1 );
 else
 return nullptr;
 }
 
 if( aVar == wxT( "A" ) || aVar == wxT( "AB" ) )
 vref = std::make_unique<PCB_EXPR_VAR_REF>( 0 );
 else if( aVar == wxT( "B" ) )
 vref = std::make_unique<PCB_EXPR_VAR_REF>( 1 );
 else if( aVar == wxT( "L" ) )
 vref = std::make_unique<PCB_EXPR_VAR_REF>( 2 );
 else
 return nullptr;
 
 if( aField.length() == 0 ) // return reference to base object
 {
 return std::move( vref );
 }
 
 wxString field( aField );
 field.Replace( wxT( "_" ), wxT( " " ) );
 
 for( const PROPERTY_MANAGER::CLASS_INFO& cls : propMgr.GetAllClasses() )
 {
 if( propMgr.IsOfType( cls.type, TYPE_HASH( BOARD_ITEM ) ) )
 {
 PROPERTY_BASE* prop = propMgr.GetProperty( cls.type, field );
 
 if( prop )
 {
 vref->AddAllowedClass( cls.type, prop );
 
 if( prop->TypeHash() == TYPE_HASH( int ) )
 {
 vref->SetType( LIBEVAL::VT_NUMERIC );
 }
 else if( prop->TypeHash() == TYPE_HASH( wxString ) )
 {
 vref->SetType( LIBEVAL::VT_STRING );
 }
 else if ( prop->HasChoices() )
 { // it's an enum, we treat it as string
 vref->SetType( LIBEVAL::VT_STRING );
 vref->SetIsEnum ( true );
 }
 else
 {
 wxFAIL_MSG( wxT( "PCB_EXPR_UCODE::createVarRef: Unknown property type." ) );
 }
 }
 }
 }
 
 if( vref->GetType() == LIBEVAL::VT_UNDEFINED )
 vref->SetType( LIBEVAL::VT_PARSE_ERROR );
 
 return std::move( vref );
}
 
 
BOARD* PCB_EXPR_CONTEXT::GetBoard() const
{
 if( m_items[0] )
 return m_items[0]->GetBoard();
 
 return nullptr;
}
 
 
class PCB_UNIT_RESOLVER : public LIBEVAL::UNIT_RESOLVER
{
public:
 virtual ~PCB_UNIT_RESOLVER()
 {
 }
 
 virtual const std::vector<wxString>& GetSupportedUnits() const override
 {
 static const std::vector<wxString> pcbUnits = { wxT( "mil" ), wxT( "mm" ), wxT( "in" ) };
 
 return pcbUnits;
 }
 
 virtual wxString GetSupportedUnitsMessage() const override
 {
 return _( "must be mm, in, or mil" );
 }
 
 virtual double Convert( const wxString& aString, int unitId ) const override
 {
 double v = wxAtof( aString );
 
 switch( unitId )
 {
 case 0: return EDA_UNIT_UTILS::UI::DoubleValueFromString( pcbIUScale, EDA_UNITS::MILS, aString );
 case 1: return EDA_UNIT_UTILS::UI::DoubleValueFromString( pcbIUScale, EDA_UNITS::MILLIMETRES, aString );
 case 2: return EDA_UNIT_UTILS::UI::DoubleValueFromString( pcbIUScale, EDA_UNITS::INCHES, aString );
 default: return v;
 }
 };
};
 
 
PCB_EXPR_COMPILER::PCB_EXPR_COMPILER()
{
 m_unitResolver = std::make_unique<PCB_UNIT_RESOLVER>();
}
 
 
PCB_EXPR_EVALUATOR::PCB_EXPR_EVALUATOR() :
 m_result( 0 ),
 m_compiler(),
 m_ucode(),
 m_errorStatus()
{
}
 
 
PCB_EXPR_EVALUATOR::~PCB_EXPR_EVALUATOR()
{
}
 
 
bool PCB_EXPR_EVALUATOR::Evaluate( const wxString& aExpr )
{
 PCB_EXPR_UCODE ucode;
 PCB_EXPR_CONTEXT preflightContext( NULL_CONSTRAINT, F_Cu );
 
 if( !m_compiler.Compile( aExpr.ToUTF8().data(), &ucode, &preflightContext ) )
 return false;
 
 PCB_EXPR_CONTEXT evaluationContext( NULL_CONSTRAINT, F_Cu );
 LIBEVAL::VALUE* result = ucode.Run( &evaluationContext );
 
 if( result->GetType() == LIBEVAL::VT_NUMERIC )
 m_result = KiROUND( result->AsDouble() );
 
 return true;
}