net_settings.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2020 CERN
 * Copyright The KiCad Developers, see AUTHORS.txt for contributors.
 * @author Jon Evans <[email protected]>
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
#include <algorithm>
#include <limits>
 
#include <json_common.h>
 
#include <project/net_settings.h>
#include <settings/json_settings_internals.h>
#include <settings/parameters.h>
#include <settings/settings_manager.h>
#include <string_utils.h>
#include <base_units.h>
#include <unordered_set>
 
 
// const int netSettingsSchemaVersion = 0;
// const int netSettingsSchemaVersion = 1;     // new overbar syntax
// const int netSettingsSchemaVersion = 2;     // exclude buses from netclass members
// const int netSettingsSchemaVersion = 3;     // netclass assignment patterns
// const int netSettingsSchemaVersion = 4;     // netclass ordering
const int netSettingsSchemaVersion = 5; // Tuning profile names
 
 
static std::optional<int> getInPcbUnits( const nlohmann::json& aObj, const std::string& aKey,
                               std::optional<int> aDefault = std::optional<int>() )
{
    if( aObj.contains( aKey ) && aObj[aKey].is_number() )
        return pcbIUScale.mmToIU( aObj[aKey].get<double>() );
    else
        return aDefault;
};
 
 
static std::optional<int> getInSchUnits( const nlohmann::json& aObj, const std::string& aKey,
                                         std::optional<int> aDefault = std::optional<int>() )
{
    if( aObj.contains( aKey ) && aObj[aKey].is_number() )
        return schIUScale.MilsToIU( aObj[aKey].get<double>() );
    else
        return aDefault;
};
 
 
NET_SETTINGS::NET_SETTINGS( JSON_SETTINGS* aParent, const std::string& aPath ) :
        NESTED_SETTINGS( "net_settings", netSettingsSchemaVersion, aParent, aPath, false )
{
    m_defaultNetClass = std::make_shared<NETCLASS>( NETCLASS::Default, true );
    m_defaultNetClass->SetDescription( _( "This is the default net class." ) );
    m_defaultNetClass->SetPriority( std::numeric_limits<int>::max() );
 
    auto saveNetclass =
            []( nlohmann::json& json_array, const std::shared_ptr<NETCLASS>& nc )
            {
                // Note: we're in common/, but we do happen to know which of these
                // fields are used in which units system.
                nlohmann::json nc_json = { { "name", nc->GetName().ToUTF8() },
                                           { "priority", nc->GetPriority() },
                                           { "schematic_color", nc->GetSchematicColor( true ) },
                                           { "pcb_color", nc->GetPcbColor( true ) },
                                           { "tuning_profile", nc->GetTuningProfile() } };
 
                auto saveInPcbUnits =
                        []( nlohmann::json& json, const std::string& aKey, int aValue )
                        {
                            json.push_back( { aKey, pcbIUScale.IUTomm( aValue ) } );
                        };
 
                if( nc->HasWireWidth() )
                    nc_json.push_back(
                            { "wire_width", schIUScale.IUToMils( nc->GetWireWidth() ) } );
 
                if( nc->HasBusWidth() )
                    nc_json.push_back( { "bus_width", schIUScale.IUToMils( nc->GetBusWidth() ) } );
 
                if( nc->HasLineStyle() )
                    nc_json.push_back( { "line_style", nc->GetLineStyle() } );
 
                if( nc->HasClearance() )
                    saveInPcbUnits( nc_json, "clearance", nc->GetClearance() );
 
                if( nc->HasTrackWidth() )
                    saveInPcbUnits( nc_json, "track_width", nc->GetTrackWidth() );
 
                if( nc->HasViaDiameter() )
                    saveInPcbUnits( nc_json, "via_diameter", nc->GetViaDiameter() );
 
                if( nc->HasViaDrill() )
                    saveInPcbUnits( nc_json, "via_drill", nc->GetViaDrill() );
 
                if( nc->HasuViaDiameter() )
                    saveInPcbUnits( nc_json, "microvia_diameter", nc->GetuViaDiameter() );
 
                if( nc->HasuViaDrill() )
                    saveInPcbUnits( nc_json, "microvia_drill", nc->GetuViaDrill()  );
 
                if( nc->HasDiffPairWidth() )
                    saveInPcbUnits( nc_json, "diff_pair_width", nc->GetDiffPairWidth() );
 
                if( nc->HasDiffPairGap() )
                    saveInPcbUnits( nc_json, "diff_pair_gap", nc->GetDiffPairGap() );
 
                if( nc->HasDiffPairViaGap() )
                    saveInPcbUnits( nc_json, "diff_pair_via_gap", nc->GetDiffPairViaGap() );
 
                json_array.push_back( nc_json );
            };
 
    auto readNetClass =
            []( const nlohmann::json& entry )
            {
                wxString name = entry["name"];
 
                std::shared_ptr<NETCLASS> nc = std::make_shared<NETCLASS>( name, false );
 
                if( entry.contains( "priority" ) && entry["priority"].is_number() )
                    nc->SetPriority( entry["priority"].get<int>() );
 
                if( entry.contains( "tuning_profile" ) && entry["tuning_profile"].is_string() )
                    nc->SetTuningProfile( entry["tuning_profile"].get<wxString>() );
 
                if( auto value = getInPcbUnits( entry, "clearance" ) )
                    nc->SetClearance( *value );
 
                if( auto value = getInPcbUnits( entry, "track_width" ) )
                    nc->SetTrackWidth( *value );
 
                if( auto value = getInPcbUnits( entry, "via_diameter" ) )
                    nc->SetViaDiameter( *value );
 
                if( auto value = getInPcbUnits( entry, "via_drill" ) )
                    nc->SetViaDrill( *value );
 
                if( auto value = getInPcbUnits( entry, "microvia_diameter" ) )
                    nc->SetuViaDiameter( *value );
 
                if( auto value = getInPcbUnits( entry, "microvia_drill" ) )
                    nc->SetuViaDrill( *value );
 
                if( auto value = getInPcbUnits( entry, "diff_pair_width" ) )
                    nc->SetDiffPairWidth( *value );
 
                if( auto value = getInPcbUnits( entry, "diff_pair_gap" ) )
                    nc->SetDiffPairGap( *value );
 
                if( auto value = getInPcbUnits( entry, "diff_pair_via_gap" ) )
                    nc->SetDiffPairViaGap( *value );
 
                if( auto value = getInSchUnits( entry, "wire_width" ) )
                    nc->SetWireWidth( *value );
 
                if( auto value = getInSchUnits( entry, "bus_width" ) )
                    nc->SetBusWidth( *value );
 
                if( entry.contains( "line_style" ) && entry["line_style"].is_number() )
                    nc->SetLineStyle( entry["line_style"].get<int>() );
 
                if( entry.contains( "pcb_color" ) && entry["pcb_color"].is_string() )
                    nc->SetPcbColor( entry["pcb_color"].get<KIGFX::COLOR4D>() );
 
                if( entry.contains( "schematic_color" )
                        && entry["schematic_color"].is_string() )
                {
                    nc->SetSchematicColor( entry["schematic_color"].get<KIGFX::COLOR4D>() );
                }
 
                return nc;
            };
 
    m_params.emplace_back( new PARAM_LAMBDA<nlohmann::json>( "classes",
            [&]() -> nlohmann::json
            {
                nlohmann::json ret = nlohmann::json::array();
 
                if( m_defaultNetClass )
                    saveNetclass( ret, m_defaultNetClass );
 
                for( const auto& [name, netclass] : m_netClasses )
                    saveNetclass( ret, netclass );
 
                return ret;
            },
            [&]( const nlohmann::json& aJson )
            {
                if( !aJson.is_array() )
                    return;
 
                m_netClasses.clear();
 
                for( const nlohmann::json& entry : aJson )
                {
                    if( !entry.is_object() || !entry.contains( "name" ) )
                        continue;
 
                    std::shared_ptr<NETCLASS> nc = readNetClass( entry );
 
                    if( nc->IsDefault() )
                        m_defaultNetClass = nc;
                    else
                        m_netClasses[nc->GetName()] = nc;
                }
            },
            {} ) );
 
    m_params.emplace_back( new PARAM_LAMBDA<nlohmann::json>( "net_colors",
            [&]() -> nlohmann::json
            {
                nlohmann::json ret = {};
 
                for( const auto& [netname, color] : m_netColorAssignments )
                {
                    std::string key( netname.ToUTF8() );
                    ret[ std::move( key ) ] = color;
                }
 
                return ret;
            },
            [&]( const nlohmann::json& aJson )
            {
                if( !aJson.is_object() )
                    return;
 
                m_netColorAssignments.clear();
 
                for( const auto& pair : aJson.items() )
                {
                    wxString key( pair.key().c_str(), wxConvUTF8 );
                    m_netColorAssignments[std::move( key )] = pair.value().get<KIGFX::COLOR4D>();
                }
            },
            {} ) );
 
    m_params.emplace_back( new PARAM_LAMBDA<nlohmann::json>( "net_chain_classes",
            [&]() -> nlohmann::json
            {
                // Force object type so an empty map round-trips as {} rather than null;
                // the reader rejects non-objects, which would otherwise leave stale
                // chain assignments in place after the user clears them all.
                nlohmann::json ret = nlohmann::json::object();
 
                for( const auto& [chain, className] : m_netChainClasses )
                    ret[ std::string( chain.ToUTF8() ) ] = std::string( className.ToUTF8() );
 
                return ret;
            },
            [&]( const nlohmann::json& aJson )
            {
                if( !aJson.is_object() )
                    return;
 
                m_netChainClasses.clear();
 
                for( const auto& pair : aJson.items() )
                {
                    wxString chain( pair.key().c_str(), wxConvUTF8 );
                    wxString className = pair.value().get<wxString>();
 
                    if( !className.IsEmpty() )
                        m_netChainClasses[ std::move( chain ) ] = std::move( className );
                }
            },
            {} ) );
 
    m_params.emplace_back( new PARAM_LAMBDA<nlohmann::json>( "netclass_assignments",
            [&]() -> nlohmann::json
            {
                nlohmann::json ret = {};
 
                for( const auto& [netname, netclassNames] : m_netClassLabelAssignments )
                {
                    nlohmann::json netclassesJson = nlohmann::json::array();
 
                    for( const auto& netclass : netclassNames )
                    {
                        std::string netclassStr( netclass.ToUTF8() );
                        netclassesJson.push_back( std::move( netclassStr ) );
                    }
 
                    std::string key( netname.ToUTF8() );
                    ret[std::move( key )] = netclassesJson;
                }
 
                return ret;
            },
            [&]( const nlohmann::json& aJson )
            {
                if( !aJson.is_object() )
                    return;
 
                m_netClassLabelAssignments.clear();
 
                for( const auto& pair : aJson.items() )
                {
                    wxString key( pair.key().c_str(), wxConvUTF8 );
 
                    for( const auto& netclassName : pair.value() )
                        m_netClassLabelAssignments[key].insert( netclassName.get<wxString>() );
                }
            },
            {} ) );
 
    m_params.emplace_back( new PARAM_LAMBDA<nlohmann::json>( "netclass_patterns",
            [&]() -> nlohmann::json
            {
                nlohmann::json ret = nlohmann::json::array();
 
                for( const auto& [matcher, netclassName] : m_netClassPatternAssignments )
                {
                    nlohmann::json pattern_json = {
                        { "pattern",  matcher->GetPattern().ToUTF8() },
                        { "netclass", netclassName.ToUTF8() }
                    };
 
                    ret.push_back( std::move( pattern_json ) );
                }
 
                return ret;
            },
            [&]( const nlohmann::json& aJson )
            {
                if( !aJson.is_array() )
                    return;
 
                m_netClassPatternAssignments.clear();
 
                for( const nlohmann::json& entry : aJson )
                {
                    if( !entry.is_object() )
                        continue;
 
                    if( entry.contains( "pattern" ) && entry["pattern"].is_string()
                            && entry.contains( "netclass" ) && entry["netclass"].is_string() )
                    {
                        wxString pattern = entry["pattern"].get<wxString>();
                        wxString netclass = entry["netclass"].get<wxString>();
 
                        // Expand bus patterns so individual bus member nets can be matched
                        ForEachBusMember( pattern,
                                          [&]( const wxString& memberPattern )
                                          {
                                              addSinglePatternAssignment( memberPattern, netclass );
                                          } );
                    }
                }
            },
            {} ) );
 
    registerMigration( 0, 1, std::bind( &NET_SETTINGS::migrateSchema0to1, this ) );
    registerMigration( 1, 2, std::bind( &NET_SETTINGS::migrateSchema1to2, this ) );
    registerMigration( 2, 3, std::bind( &NET_SETTINGS::migrateSchema2to3, this ) );
    registerMigration( 3, 4, std::bind( &NET_SETTINGS::migrateSchema3to4, this ) );
    registerMigration( 4, 5, std::bind( &NET_SETTINGS::migrateSchema4to5, this ) );
}
 
 
NET_SETTINGS::~NET_SETTINGS()
{
    // Release early before destroying members
    if( m_parent )
    {
        m_parent->ReleaseNestedSettings( this );
        m_parent = nullptr;
    }
}
 
 
bool NET_SETTINGS::operator==( const NET_SETTINGS& aOther ) const
{
    // m_netClasses maps name -> shared_ptr<NETCLASS>.  The default pair operator==
    // would compare the shared_ptrs by pointer identity, missing in-place edits
    // to the underlying NETCLASS (the UI's normal edit path mutates through the
    // shared_ptr rather than swapping it).  Compare names and contents instead.
    auto netclassEntryEqual = []( const auto& aLhs, const auto& aRhs )
    {
        if( aLhs.first != aRhs.first )
            return false;
 
        if( aLhs.second.get() == aRhs.second.get() )
            return true;
 
        if( !aLhs.second || !aRhs.second )
            return false;
 
        return aLhs.second->EqualsByPersistedFields( *aRhs.second );
    };
 
    if( !std::equal( std::begin( m_netClasses ), std::end( m_netClasses ),
                     std::begin( aOther.m_netClasses ), std::end( aOther.m_netClasses ),
                     netclassEntryEqual ) )
        return false;
 
    // m_defaultNetClass is held by shared_ptr and (per board.cpp / kicad_sexpr_parser.cpp
    // setup paths) is mutated in place via GetDefaultNetclass()->SetClearance( ... ).
    // shared_ptr identity is preserved across those edits, so a pointer-only check
    // would silently drop the most common project edit.  Compare contents.
    if( static_cast<bool>( m_defaultNetClass ) != static_cast<bool>( aOther.m_defaultNetClass ) )
        return false;
 
    if( m_defaultNetClass && aOther.m_defaultNetClass
        && !m_defaultNetClass->EqualsByPersistedFields( *aOther.m_defaultNetClass ) )
    {
        return false;
    }
 
    // m_netClassPatternAssignments stores std::unique_ptr<EDA_COMBINED_MATCHER>, so a naive
    // std::equal would compare matcher pointer identity and report two settings instances built
    // from identical input as unequal.  Compare pattern text plus the assigned netclass name.
    auto patternEqual = []( const auto& aLhs, const auto& aRhs )
    {
        if( !aLhs.first || !aRhs.first )
            return aLhs.first.get() == aRhs.first.get() && aLhs.second == aRhs.second;
 
        return aLhs.first->GetPattern() == aRhs.first->GetPattern() && aLhs.second == aRhs.second;
    };
 
    if( !std::equal( std::begin( m_netClassPatternAssignments ),
                     std::end( m_netClassPatternAssignments ),
                     std::begin( aOther.m_netClassPatternAssignments ),
                     std::end( aOther.m_netClassPatternAssignments ),
                     patternEqual ) )
        return false;
 
    // m_netClassChainPatternAssignments is derived state, rebuilt from m_netChainClasses and
    // board NETINFO on every netlist update.  Equality is defined by persisted inputs only;
    // including the derived list here would mark the project dirty whenever a rebuild produced
    // a transient ordering difference.
 
    if( !std::equal( std::begin( m_netClassLabelAssignments ),
                     std::end( m_netClassLabelAssignments ),
                     std::begin( aOther.m_netClassLabelAssignments ),
                     std::end( aOther.m_netClassLabelAssignments ) ) )
        return false;
 
    if( !std::equal( std::begin( m_netColorAssignments ), std::end( m_netColorAssignments ),
                     std::begin( aOther.m_netColorAssignments ),
                     std::end( aOther.m_netColorAssignments ) ) )
        return false;
 
    if( m_netChainClasses != aOther.m_netChainClasses )
        return false;
 
    return true;
}
 
 
void NET_SETTINGS::CopyFrom( NET_SETTINGS& aOther )
{
    if( &aOther == this )
        return;
 
    // Flush the source's live field state into its JSON cache so the cache
    // mirrors what we want to copy.
    aOther.Store();
 
    // CloneFrom() copies the JSON tree but leaves m_parent / m_path untouched,
    // which is what we need: this instance must stay attached to its host
    // project file so SaveToFile() walks the right m_nested_settings entry.
    Internals()->CloneFrom( *aOther.Internals() );
 
    // Repopulate our in-memory NETCLASS / pattern / color state from the cloned
    // JSON.  Load() rebuilds m_defaultNetClass, m_netClasses, fresh
    // EDA_COMBINED_MATCHER instances for m_netClassPatternAssignments, and the
    // remaining maps, decoupling our instance from aOther's lifetime.
    Load();
 
    // Load() repopulates persisted state but doesn't clear the derived caches.
    // Drop them so stale lookups from this instance's pre-CopyFrom life
    // (composite resolutions, implicit netclasses, chain-derived patterns
    // rebuilt on every netlist update, and the per-net effective-class cache)
    // don't survive the swap.
    m_compositeNetClasses.clear();
    m_impicitNetClasses.clear();
    m_netClassChainPatternAssignments.clear();
    ClearAllCaches();
}
 
 
bool NET_SETTINGS::migrateSchema0to1()
{
    if( m_internals->contains( "classes" ) && m_internals->At( "classes" ).is_array() )
    {
        for( auto& netClass : m_internals->At( "classes" ).items() )
        {
            if( netClass.value().contains( "nets" ) && netClass.value()["nets"].is_array() )
            {
                nlohmann::json migrated = nlohmann::json::array();
 
                for( auto& net : netClass.value()["nets"].items() )
                    migrated.push_back( ConvertToNewOverbarNotation( net.value().get<wxString>() ) );
 
                netClass.value()["nets"] = migrated;
            }
        }
    }
 
    return true;
}
 
 
bool NET_SETTINGS::migrateSchema1to2()
{
    return true;
}
 
 
bool NET_SETTINGS::migrateSchema2to3()
{
    if( m_internals->contains( "classes" ) && m_internals->At( "classes" ).is_array() )
    {
        nlohmann::json patterns = nlohmann::json::array();
 
        for( auto& netClass : m_internals->At( "classes" ).items() )
        {
            if( netClass.value().contains( "name" )
                    && netClass.value().contains( "nets" )
                    && netClass.value()["nets"].is_array() )
            {
                wxString netClassName = netClass.value()["name"].get<wxString>();
 
                for( auto& net : netClass.value()["nets"].items() )
                {
                    nlohmann::json pattern_json = {
                        { "pattern",  net.value().get<wxString>() },
                        { "netclass", netClassName }
                    };
 
                    patterns.push_back( pattern_json );
                }
            }
        }
 
        m_internals->SetFromString( "netclass_patterns", patterns );
    }
 
    return true;
}
 
 
bool NET_SETTINGS::migrateSchema3to4()
{
    // Add priority field to netclasses
    if( m_internals->contains( "classes" ) && m_internals->At( "classes" ).is_array() )
    {
        int priority = 0;
 
        for( auto& netClass : m_internals->At( "classes" ).items() )
        {
            if( netClass.value()["name"].get<wxString>() == NETCLASS::Default )
                netClass.value()["priority"] = std::numeric_limits<int>::max();
            else
                netClass.value()["priority"] = priority++;
        }
    }
 
    // Move netclass assignments to a list
    if( m_internals->contains( "netclass_assignments" )
        && m_internals->At( "netclass_assignments" ).is_object() )
    {
        nlohmann::json migrated = {};
 
        for( const auto& pair : m_internals->At( "netclass_assignments" ).items() )
        {
            nlohmann::json netclassesJson = nlohmann::json::array();
 
            if( pair.value().get<wxString>() != wxEmptyString )
                netclassesJson.push_back( pair.value() );
 
            migrated[pair.key()] = netclassesJson;
        }
 
        m_internals->SetFromString( "netclass_assignments", migrated );
    }
 
    return true;
}
 
 
bool NET_SETTINGS::migrateSchema4to5()
{
    // Add tuning profile name field to netclasses
    if( m_internals->contains( "classes" ) && m_internals->At( "classes" ).is_array() )
    {
        const wxString emptyStr = "";
 
        for( auto& netClass : m_internals->At( "classes" ).items() )
            netClass.value()["tuning_profile"] = emptyStr.ToUTF8();
    }
 
    return true;
}
 
 
void NET_SETTINGS::SetDefaultNetclass( std::shared_ptr<NETCLASS> netclass )
{
    m_defaultNetClass = netclass;
}
 
 
std::shared_ptr<NETCLASS> NET_SETTINGS::GetDefaultNetclass() const
{
    return m_defaultNetClass;
}
 
 
bool NET_SETTINGS::HasNetclass( const wxString& netclassName ) const
{
    return m_netClasses.find( netclassName ) != m_netClasses.end();
}
 
 
void NET_SETTINGS::SetNetclass( const wxString& netclassName, std::shared_ptr<NETCLASS>& netclass )
{
    m_netClasses[netclassName] = netclass;
}
 
 
void NET_SETTINGS::SetNetclasses( const std::map<wxString, std::shared_ptr<NETCLASS>>& netclasses )
{
    m_netClasses = netclasses;
    ClearAllCaches();
}
 
 
const std::map<wxString, std::shared_ptr<NETCLASS>>& NET_SETTINGS::GetNetclasses() const
{
    return m_netClasses;
}
 
 
const std::map<wxString, std::shared_ptr<NETCLASS>>& NET_SETTINGS::GetCompositeNetclasses() const
{
    return m_compositeNetClasses;
}
 
 
void NET_SETTINGS::ClearNetclasses()
{
    m_netClasses.clear();
    m_impicitNetClasses.clear();
    ClearAllCaches();
}
 
 
const std::map<wxString, std::set<wxString>>& NET_SETTINGS::GetNetclassLabelAssignments() const
{
    return m_netClassLabelAssignments;
}
 
 
void NET_SETTINGS::ClearNetclassLabelAssignments()
{
    m_netClassLabelAssignments.clear();
}
 
 
void NET_SETTINGS::ClearNetclassLabelAssignment( const wxString& netName )
{
    m_netClassLabelAssignments.erase( netName );
}
 
 
void NET_SETTINGS::SetNetclassLabelAssignment( const wxString&           netName,
                                               const std::set<wxString>& netclasses )
{
    m_netClassLabelAssignments[netName] = netclasses;
}
 
 
void NET_SETTINGS::AppendNetclassLabelAssignment( const wxString&           netName,
                                                  const std::set<wxString>& netclasses )
{
    m_netClassLabelAssignments[netName].insert( netclasses.begin(), netclasses.end() );
}
 
 
bool NET_SETTINGS::HasNetclassLabelAssignment( const wxString& netName ) const
{
    return m_netClassLabelAssignments.find( netName ) != m_netClassLabelAssignments.end();
}
 
 
void NET_SETTINGS::SetNetclassPatternAssignment( const wxString& pattern, const wxString& netclass )
{
    // Expand bus patterns (vector buses and bus groups) to individual member patterns.
    // This is necessary because the regex/wildcard matchers interpret brackets and braces
    // as special characters, not as bus notation.
    ForEachBusMember( pattern,
                      [&]( const wxString& memberPattern )
                      {
                          addSinglePatternAssignment( memberPattern, netclass );
                      } );
 
    ClearAllCaches();
}
 
 
void NET_SETTINGS::addSinglePatternAssignment( const wxString& pattern, const wxString& netclass )
{
    // Avoid exact duplicates - these shouldn't cause problems, due to later de-duplication
    // but they are unnecessary.
    for( auto& assignment : m_netClassPatternAssignments )
    {
        if( assignment.first->GetPattern() == pattern && assignment.second == netclass )
            return;
    }
 
    // No assignment, add a new one
    m_netClassPatternAssignments.push_back(
            { std::make_unique<EDA_COMBINED_MATCHER>( pattern, CTX_NETCLASS ), netclass } );
}
 
 
void NET_SETTINGS::SetNetclassPatternAssignments(
        std::vector<std::pair<std::unique_ptr<EDA_COMBINED_MATCHER>, wxString>>&& netclassPatterns )
{
    m_netClassPatternAssignments = std::move( netclassPatterns );
    ClearAllCaches();
}
 
 
std::vector<std::pair<std::unique_ptr<EDA_COMBINED_MATCHER>, wxString>>&
NET_SETTINGS::GetNetclassPatternAssignments()
{
    return m_netClassPatternAssignments;
}
 
 
void NET_SETTINGS::ClearNetclassPatternAssignments()
{
    m_netClassPatternAssignments.clear();
}
 
 
void NET_SETTINGS::SetChainPatternAssignment( const wxString& pattern, const wxString& netclass )
{
    ForEachBusMember( pattern,
                      [&]( const wxString& memberPattern )
                      {
                          addSingleChainPatternAssignment( memberPattern, netclass );
                      } );
 
    ClearAllCaches();
}
 
 
void NET_SETTINGS::addSingleChainPatternAssignment( const wxString& pattern,
                                                    const wxString& netclass )
{
    for( auto& assignment : m_netClassChainPatternAssignments )
    {
        if( !assignment.first )
            continue;
 
        if( assignment.first->GetPattern() == pattern && assignment.second == netclass )
            return;
    }
 
    m_netClassChainPatternAssignments.push_back(
            { std::make_unique<EDA_COMBINED_MATCHER>( pattern, CTX_NETCLASS ), netclass } );
}
 
 
void NET_SETTINGS::ClearChainPatternAssignments()
{
    m_netClassChainPatternAssignments.clear();
    ClearAllCaches();
}
 
 
void NET_SETTINGS::ClearCacheForNet( const wxString& netName )
{
    if( m_effectiveNetclassCache.count( netName ) )
    {
        wxString compositeNetclassName = m_effectiveNetclassCache[netName]->GetName();
        m_compositeNetClasses.erase( compositeNetclassName );
        m_effectiveNetclassCache.erase( netName );
    }
}
 
 
void NET_SETTINGS::ClearAllCaches()
{
    m_effectiveNetclassCache.clear();
    m_compositeNetClasses.clear();
}
 
 
void NET_SETTINGS::SetNetColorAssignment( const wxString& netName, const KIGFX::COLOR4D& color )
{
    m_netColorAssignments[netName] = color;
}
 
 
const std::map<wxString, KIGFX::COLOR4D>& NET_SETTINGS::GetNetColorAssignments() const
{
    return m_netColorAssignments;
}
 
 
void NET_SETTINGS::ClearNetColorAssignments()
{
    m_netColorAssignments.clear();
}
 
 
bool NET_SETTINGS::HasEffectiveNetClass( const wxString& aNetName ) const
{
    return m_effectiveNetclassCache.count( aNetName ) > 0;
}
 
 
std::shared_ptr<NETCLASS> NET_SETTINGS::GetCachedEffectiveNetClass( const wxString& aNetName ) const
{
    return m_effectiveNetclassCache.at( aNetName );
}
 
 
std::shared_ptr<NETCLASS> NET_SETTINGS::GetEffectiveNetClass( const wxString& aNetName )
{
    // Lambda to fetch an explicit netclass. Returns a nullptr if not found
    auto getExplicitNetclass =
            [this]( const wxString& netclass ) -> std::shared_ptr<NETCLASS>
            {
                if( netclass == NETCLASS::Default )
                    return m_defaultNetClass;
 
                auto ii = m_netClasses.find( netclass );
 
                if( ii == m_netClasses.end() )
                    return {};
                else
                    return ii->second;
            };
 
    // Lambda to fetch or create an implicit netclass (defined with a label, but not configured)
    // These are needed as while they do not provide any netclass parameters, they do now appear in
    // DRC matching strings as an assigned netclass.
    auto getOrAddImplicitNetcless =
            [this]( const wxString& netclass ) -> std::shared_ptr<NETCLASS>
            {
                auto ii = m_impicitNetClasses.find( netclass );
 
                if( ii == m_impicitNetClasses.end() )
                {
                    std::shared_ptr<NETCLASS> nc = std::make_shared<NETCLASS>( netclass, false );
                    nc->SetPriority( std::numeric_limits<int>::max() - 1 ); // Priority > default netclass
                    m_impicitNetClasses[netclass] = nc;
                    return nc;
                }
                else
                {
                    return ii->second;
                }
            };
 
    // <no net> is forced to be part of the default netclass.
    if( aNetName.IsEmpty() )
        return m_defaultNetClass;
 
    // First check if we have a cached resolved netclass
    auto cacheItr = m_effectiveNetclassCache.find( aNetName );
 
    if( cacheItr != m_effectiveNetclassCache.end() )
        return cacheItr->second;
 
    // No cache found - build a vector of all netclasses assigned to or matching this net
    std::unordered_set<std::shared_ptr<NETCLASS>> resolvedNetclasses;
 
    // First find explicit netclass assignments
    auto it = m_netClassLabelAssignments.find( aNetName );
 
    if( it != m_netClassLabelAssignments.end() && it->second.size() > 0 )
    {
        for( const wxString& netclassName : it->second )
        {
            std::shared_ptr<NETCLASS> netclass = getExplicitNetclass( netclassName );
 
            if( netclass )
            {
                resolvedNetclasses.insert( std::move( netclass ) );
            }
            else
            {
                resolvedNetclasses.insert( getOrAddImplicitNetcless( netclassName ) );
            }
        }
    }
 
    // Now find any pattern-matched netclass assignments (user + chain-derived)
    auto applyPatternList =
            [&]( const std::vector<std::pair<std::unique_ptr<EDA_COMBINED_MATCHER>, wxString>>&
                         patterns )
            {
                for( const auto& [matcher, netclassName] : patterns )
                {
                    if( matcher->StartsWith( aNetName ) )
                    {
                        std::shared_ptr<NETCLASS> netclass = getExplicitNetclass( netclassName );
 
                        if( netclass )
                            resolvedNetclasses.insert( std::move( netclass ) );
                        else
                            resolvedNetclasses.insert( getOrAddImplicitNetcless( netclassName ) );
                    }
                }
            };
 
    applyPatternList( m_netClassPatternAssignments );
    applyPatternList( m_netClassChainPatternAssignments );
 
    // Handle zero resolved netclasses
    if( resolvedNetclasses.size() == 0 )
    {
        // For bus patterns, check if all members share the same netclass.
        // If they do, the bus inherits that netclass for coloring purposes.
        std::shared_ptr<NETCLASS> sharedNetclass;
        bool                      allSameNetclass = true;
        bool                      isBusPattern = false;
 
        ForEachBusMember( aNetName,
                          [&]( const wxString& member )
                          {
                              // If ForEachBusMember gives us back the same name, it's not a bus.
                              // Skip to avoid infinite recursion.
                              if( member == aNetName )
                                  return;
 
                              isBusPattern = true;
 
                              if( !allSameNetclass )
                                  return;
 
                              std::shared_ptr<NETCLASS> memberNc = GetEffectiveNetClass( member );
 
                              if( !sharedNetclass )
                              {
                                  sharedNetclass = memberNc;
                              }
                              else if( memberNc->GetName() != sharedNetclass->GetName() )
                              {
                                  allSameNetclass = false;
                              }
                          } );
 
        if( isBusPattern && allSameNetclass && sharedNetclass
            && sharedNetclass->GetName() != NETCLASS::Default )
        {
            m_effectiveNetclassCache[aNetName] = sharedNetclass;
            return sharedNetclass;
        }
 
        m_effectiveNetclassCache[aNetName] = m_defaultNetClass;
 
        return m_defaultNetClass;
    }
 
    // Make and cache the effective netclass. Note that makeEffectiveNetclass will add the default
    // netclass to resolvedNetclasses if it is needed to complete the netclass paramters set. It
    // will also sort resolvedNetclasses by priority order.
    std::vector<NETCLASS*> netclassPtrs;
 
    for( const std::shared_ptr<NETCLASS>& nc : resolvedNetclasses )
        netclassPtrs.push_back( nc.get() );
 
    wxString name;
    name.Printf( "Effective for net: %s", aNetName );
    std::shared_ptr<NETCLASS> effectiveNetclass = std::make_shared<NETCLASS>( name, false );
    makeEffectiveNetclass( effectiveNetclass, netclassPtrs );
 
    if( netclassPtrs.size() == 1 )
    {
        // No defaults were added - just return the primary netclass
        m_effectiveNetclassCache[aNetName] = *resolvedNetclasses.begin();
        return *resolvedNetclasses.begin();
    }
    else
    {
        effectiveNetclass->SetConstituentNetclasses( std::move( netclassPtrs ) );
 
        m_compositeNetClasses[effectiveNetclass->GetName()] = effectiveNetclass;
        m_effectiveNetclassCache[aNetName] = effectiveNetclass;
 
        return effectiveNetclass;
    }
}
 
 
void NET_SETTINGS::RecomputeEffectiveNetclasses()
{
    for( auto& [ncName, nc] : m_compositeNetClasses )
    {
        // Note this needs to be a copy in case we now need to add the default netclass
        std::vector<NETCLASS*> constituents = nc->GetConstituentNetclasses();
 
        wxASSERT( constituents.size() > 0 );
 
        // If the last netclass is Default, remove it (it will be re-added if still needed)
        if( ( *constituents.rbegin() )->GetName() == NETCLASS::Default )
        {
            constituents.pop_back();
        }
 
        // Remake the netclass from original constituents
        nc->ResetParameters();
        makeEffectiveNetclass( nc, constituents );
        nc->SetConstituentNetclasses( std::move( constituents ) );
    }
}
 
 
void NET_SETTINGS::makeEffectiveNetclass( std::shared_ptr<NETCLASS>& effectiveNetclass,
                                          std::vector<NETCLASS*>&    constituentNetclasses ) const
{
    // Sort the resolved netclasses by priority (highest first), with same-priority netclasses
    // ordered alphabetically
    std::sort( constituentNetclasses.begin(), constituentNetclasses.end(),
               []( NETCLASS* nc1, NETCLASS* nc2 )
               {
                   int p1 = nc1->GetPriority();
                   int p2 = nc2->GetPriority();
 
                   if( p1 < p2 )
                       return true;
 
                   if (p1 == p2)
                       return nc1->GetName().Cmp( nc2->GetName() ) < 0;
 
                   return false;
               } );
 
    // Iterate from lowest priority netclass and fill effective netclass parameters
    for( auto itr = constituentNetclasses.rbegin(); itr != constituentNetclasses.rend(); ++itr )
    {
        NETCLASS* nc = *itr;
 
        if( nc->HasClearance() )
        {
            effectiveNetclass->SetClearance( nc->GetClearance() );
            effectiveNetclass->SetClearanceParent( nc );
        }
 
        if( nc->HasTrackWidth() )
        {
            effectiveNetclass->SetTrackWidth( nc->GetTrackWidth() );
            effectiveNetclass->SetTrackWidthParent( nc );
        }
 
        if( nc->HasViaDiameter() )
        {
            effectiveNetclass->SetViaDiameter( nc->GetViaDiameter() );
            effectiveNetclass->SetViaDiameterParent( nc );
        }
 
        if( nc->HasViaDrill() )
        {
            effectiveNetclass->SetViaDrill( nc->GetViaDrill() );
            effectiveNetclass->SetViaDrillParent( nc );
        }
 
        if( nc->HasuViaDiameter() )
        {
            effectiveNetclass->SetuViaDiameter( nc->GetuViaDiameter() );
            effectiveNetclass->SetuViaDiameterParent( nc );
        }
 
        if( nc->HasuViaDrill() )
        {
            effectiveNetclass->SetuViaDrill( nc->GetuViaDrill() );
            effectiveNetclass->SetuViaDrillParent( nc );
        }
 
        if( nc->HasDiffPairWidth() )
        {
            effectiveNetclass->SetDiffPairWidth( nc->GetDiffPairWidth() );
            effectiveNetclass->SetDiffPairWidthParent( nc );
        }
 
        if( nc->HasDiffPairGap() )
        {
            effectiveNetclass->SetDiffPairGap( nc->GetDiffPairGap() );
            effectiveNetclass->SetDiffPairGapParent( nc );
        }
 
        if( nc->HasDiffPairViaGap() )
        {
            effectiveNetclass->SetDiffPairViaGap( nc->GetDiffPairViaGap() );
            effectiveNetclass->SetDiffPairViaGapParent( nc );
        }
 
        if( nc->HasWireWidth() )
        {
            effectiveNetclass->SetWireWidth( nc->GetWireWidth() );
            effectiveNetclass->SetWireWidthParent( nc );
        }
 
        if( nc->HasBusWidth() )
        {
            effectiveNetclass->SetBusWidth( nc->GetBusWidth() );
            effectiveNetclass->SetBusWidthParent( nc );
        }
 
        if( nc->HasLineStyle() )
        {
            effectiveNetclass->SetLineStyle( nc->GetLineStyle() );
            effectiveNetclass->SetLineStyleParent( nc );
        }
 
        COLOR4D pcbColor = nc->GetPcbColor();
 
        if( pcbColor != COLOR4D::UNSPECIFIED )
        {
            effectiveNetclass->SetPcbColor( pcbColor );
            effectiveNetclass->SetPcbColorParent( nc );
        }
 
        COLOR4D schColor = nc->GetSchematicColor();
 
        if( schColor != COLOR4D::UNSPECIFIED )
        {
            effectiveNetclass->SetSchematicColor( schColor );
            effectiveNetclass->SetSchematicColorParent( nc );
        }
 
        if( nc->HasTuningProfile() )
        {
            effectiveNetclass->SetTuningProfile( nc->GetTuningProfile() );
            effectiveNetclass->SetTuningProfileParent( nc );
        }
    }
 
    // Fill in any required defaults
    if( addMissingDefaults( effectiveNetclass.get() ) )
        constituentNetclasses.push_back( m_defaultNetClass.get() );
}
 
 
bool NET_SETTINGS::addMissingDefaults( NETCLASS* nc ) const
{
    bool addedDefault = false;
 
    if( !nc->HasClearance() )
    {
        addedDefault = true;
        nc->SetClearance( m_defaultNetClass->GetClearance() );
        nc->SetClearanceParent( m_defaultNetClass.get() );
    }
 
    if( !nc->HasTrackWidth() )
    {
        addedDefault = true;
        nc->SetTrackWidth( m_defaultNetClass->GetTrackWidth() );
        nc->SetTrackWidthParent( m_defaultNetClass.get() );
    }
 
    if( !nc->HasViaDiameter() )
    {
        addedDefault = true;
        nc->SetViaDiameter( m_defaultNetClass->GetViaDiameter() );
        nc->SetViaDiameterParent( m_defaultNetClass.get() );
    }
 
    if( !nc->HasViaDrill() )
    {
        addedDefault = true;
        nc->SetViaDrill( m_defaultNetClass->GetViaDrill() );
        nc->SetViaDrillParent( m_defaultNetClass.get() );
    }
 
    if( !nc->HasuViaDiameter() )
    {
        addedDefault = true;
        nc->SetuViaDiameter( m_defaultNetClass->GetuViaDiameter() );
        nc->SetuViaDiameterParent( m_defaultNetClass.get() );
    }
 
    if( !nc->HasuViaDrill() )
    {
        addedDefault = true;
        nc->SetuViaDrill( m_defaultNetClass->GetuViaDrill() );
        nc->SetuViaDrillParent( m_defaultNetClass.get() );
    }
 
    if( !nc->HasDiffPairWidth() )
    {
        addedDefault = true;
        nc->SetDiffPairWidth( m_defaultNetClass->GetDiffPairWidth() );
        nc->SetDiffPairWidthParent( m_defaultNetClass.get() );
    }
 
    if( !nc->HasDiffPairGap() )
    {
        addedDefault = true;
        nc->SetDiffPairGap( m_defaultNetClass->GetDiffPairGap() );
        nc->SetDiffPairGapParent( m_defaultNetClass.get() );
    }
 
    // Currently this is only on the default netclass, and not editable in the setup panel
    // if( !nc->HasDiffPairViaGap() )
    // {
    //     addedDefault = true;
    //     nc->SetDiffPairViaGap( m_defaultNetClass->GetDiffPairViaGap() );
    //     nc->SetDiffPairViaGapParent( m_defaultNetClass.get() );
    // }
 
    if( !nc->HasWireWidth() )
    {
        addedDefault = true;
        nc->SetWireWidth( m_defaultNetClass->GetWireWidth() );
        nc->SetWireWidthParent( m_defaultNetClass.get() );
    }
 
    if( !nc->HasBusWidth() )
    {
        addedDefault = true;
        nc->SetBusWidth( m_defaultNetClass->GetBusWidth() );
        nc->SetBusWidthParent( m_defaultNetClass.get() );
    }
 
    // The tuning profile can be empty - only fill if a default tuning profile is set
    if( !nc->HasTuningProfile() && m_defaultNetClass->HasTuningProfile() )
    {
        addedDefault = true;
        nc->SetTuningProfile( m_defaultNetClass->GetTuningProfile() );
        nc->SetTuningProfileParent( m_defaultNetClass.get() );
    }
 
    return addedDefault;
}
 
 
std::shared_ptr<NETCLASS> NET_SETTINGS::GetNetClassByName( const wxString& aNetClassName ) const
{
    auto ii = m_netClasses.find( aNetClassName );
 
    if( ii == m_netClasses.end() )
        return m_defaultNetClass;
    else
        return ii->second;
}
 
 
static bool isSuperSubOverbar( wxChar c )
{
    return c == '_' || c == '^' || c == '~';
}
 

static bool isEscaped( const wxString& aStr, size_t aPos )
{
    if( aPos == 0 )
        return false;
 
    // Count consecutive backslashes before this position
    int backslashCount = 0;
    size_t pos = aPos;
 
    while( pos > 0 && aStr[pos - 1] == '\\' )
    {
        backslashCount++;
        pos--;
    }
 
    // If odd number of backslashes, the character is escaped
    return ( backslashCount % 2 ) == 1;
}
 
 
bool NET_SETTINGS::ParseBusVector( const wxString& aBus, wxString* aName,
                                   std::vector<wxString>* aMemberList )
{
    auto isDigit =
            []( wxChar c )
            {
                static   wxString digits( wxT( "0123456789" ) );
                return digits.Contains( c );
            };
 
    size_t   busLen = aBus.length();
    size_t   i = 0;
    wxString prefix;
    wxString suffix;
    wxString tmp;
    long     begin = 0;
    long     end = 0;
    int      braceNesting = 0;
    bool     fmtWrapsName = false;
    bool     inQuotes = false;
 
    prefix.reserve( busLen );
 
    // Parse prefix
    //
    // Formatting markers (^{}, _{}, ~{}) can appear either as part of the prefix name
    // (e.g. I^{2}C[0..7]) or wrapping the range specifier (e.g. D_{[1..2]}).
    // We preserve formatting in the prefix and only strip it when the range bracket
    // appears inside formatting braces, indicating the formatting wraps the range.
    //
    for( ; i < busLen; ++i )
    {
        // Handle quoted strings (allows spaces inside)
        if( aBus[i] == '"' && !isEscaped( aBus, i ) )
        {
            inQuotes = !inQuotes;
            continue;
        }
 
        if( inQuotes )
        {
            // Inside quotes, add characters directly (including spaces)
            if( aBus[i] == '\\' && i + 1 < busLen )
            {
                // Handle escaped characters inside quotes
                prefix += aBus[++i];
            }
            else
            {
                prefix += aBus[i];
            }
 
            continue;
        }
 
        if( aBus[i] == '{' )
        {
            if( i > 0 && isSuperSubOverbar( aBus[i-1] ) )
            {
                braceNesting++;
                prefix += wxT( '{' );
                continue;
            }
            else
                return false;
        }
        else if( aBus[i] == '}' )
        {
            braceNesting--;
            prefix += wxT( '}' );
            continue;
        }
 
        // Handle backslash-escaped spaces
        if( aBus[i] == '\\' && i + 1 < busLen && aBus[i + 1] == ' ' )
        {
            prefix += aBus[++i];
            continue;
        }
 
        // Unescaped space or ] in bus vector prefix is not allowed
        if( aBus[i] == ' ' || aBus[i] == ']' )
            return false;
 
        if( aBus[i] == '[' )
        {
            if( braceNesting > 0 )
            {
                size_t fmtStart = prefix.rfind( wxT( '{' ) );
 
                if( fmtStart != wxString::npos && fmtStart > 0
                    && isSuperSubOverbar( prefix[fmtStart - 1] ) )
                {
                    if( fmtStart == prefix.length() - 1 )
                    {
                        // '{' immediately precedes '[' (e.g. D_{[1..2]}).
                        // The formatting decorates the range indices, not the
                        // name itself.
                        prefix.erase( fmtStart - 1 );
                    }
                    else
                    {
                        // Name characters exist between '{' and '[' (e.g.
                        // ~{BE[0..3]}).  The formatting wraps the signal name,
                        // not the range.
                        fmtWrapsName = true;
                    }
                }
            }
 
            break;
        }
 
        prefix += aBus[i];
    }
 
    // Parse start number
    //
    i++;  // '[' character
 
    if( i >= busLen )
        return false;
 
    for( ; i < busLen; ++i )
    {
        if( aBus[i] == '.' && i + 1 < busLen && aBus[i+1] == '.' )
        {
            tmp.ToLong( &begin );
            i += 2;
            break;
        }
 
        if( !isDigit( aBus[i] ) )
            return false;
 
        tmp += aBus[i];
    }
 
    // Parse end number
    //
    tmp = wxEmptyString;
 
    if( i >= busLen )
        return false;
 
    for( ; i < busLen; ++i )
    {
        if( aBus[i] == ']' )
        {
            tmp.ToLong( &end );
            ++i;
            break;
        }
 
        if( !isDigit( aBus[i] ) )
            return false;
 
        tmp += aBus[i];
    }
 
    // Parse suffix
    //
    for( ; i < busLen; ++i )
    {
        if( aBus[i] == '}' )
        {
            braceNesting--;
 
            if( fmtWrapsName )
                suffix += aBus[i];
        }
        else if( aBus[i] == '+' || aBus[i] == '-' || aBus[i] == 'P' || aBus[i] == 'N' )
        {
            suffix += aBus[i];
        }
        else
        {
            return false;
        }
    }
 
    if( braceNesting != 0 )
        return false;
 
    if( begin == end )
        return false;
    else if( begin > end )
        std::swap( begin, end );
 
    if( aName )
        *aName = prefix;
 
    if( aMemberList )
    {
        for( long idx = begin; idx <= end; ++idx )
        {
            wxString str = prefix;
            str << idx;
            str << suffix;
 
            aMemberList->emplace_back( str );
        }
    }
 
    return true;
}
 
 
bool NET_SETTINGS::ParseBusGroup( const wxString& aGroup, wxString* aName,
                                  std::vector<wxString>* aMemberList )
{
    size_t   groupLen = aGroup.length();
    size_t   i = 0;
    wxString prefix;
    wxString tmp;
    int      braceNesting = 0;
    bool     inQuotes = false;
 
    prefix.reserve( groupLen );
 
    // Escape spaces in member names so recursive parsing by ForEachBusMember works correctly.
    // Both quoted strings and backslash-escaped spaces collapse to bare spaces during parsing,
    // so we must re-escape them for subsequent ParseBusVector/ParseBusGroup calls.
    auto escapeSpacesForBus =
            []( const wxString& aMember ) -> wxString
            {
                wxString escaped;
                escaped.reserve( aMember.length() * 2 );
 
                for( wxUniChar c : aMember )
                {
                    if( c == ' ' )
                        escaped += wxT( "\\ " );
                    else
                        escaped += c;
                }
 
                return escaped;
            };
 
    // Parse prefix
    //
    // Formatting markers (^{}, _{}, ~{}) in the prefix are part of the group name
    // and must be preserved.  The member-list opening brace is distinguished by NOT
    // being preceded by a formatting character.
    //
    for( ; i < groupLen; ++i )
    {
        // Handle quoted strings (allows spaces inside)
        if( aGroup[i] == '"' && !isEscaped( aGroup, i ) )
        {
            inQuotes = !inQuotes;
            continue;
        }
 
        if( inQuotes )
        {
            // Inside quotes, add characters directly (including spaces)
            if( aGroup[i] == '\\' && i + 1 < groupLen )
            {
                // Handle escaped characters inside quotes
                prefix += aGroup[++i];
            }
            else
            {
                prefix += aGroup[i];
            }
 
            continue;
        }
 
        if( aGroup[i] == '{' )
        {
            if( i > 0 && isSuperSubOverbar( aGroup[i-1] ) )
            {
                braceNesting++;
                prefix += wxT( '{' );
                continue;
            }
            else
                break;
        }
        else if( aGroup[i] == '}' )
        {
            braceNesting--;
            prefix += wxT( '}' );
            continue;
        }
 
        // Handle backslash-escaped spaces
        if( aGroup[i] == '\\' && i + 1 < groupLen && aGroup[i + 1] == ' ' )
        {
            prefix += aGroup[++i];
            continue;
        }
 
        // Unescaped space, [, or ] in bus group prefix is not allowed
        if( aGroup[i] == ' ' || aGroup[i] == '[' || aGroup[i] == ']' )
            return false;
 
        prefix += aGroup[i];
    }
 
    if( braceNesting != 0 )
        return false;
 
    if( aName )
        *aName = prefix;
 
    // Parse members
    //
    i++;  // '{' character
 
    if( i >= groupLen )
        return false;
 
    inQuotes = false;
 
    for( ; i < groupLen; ++i )
    {
        // Handle quoted strings (allows spaces inside member names)
        if( aGroup[i] == '"' && !isEscaped( aGroup, i ) )
        {
            inQuotes = !inQuotes;
            continue;
        }
 
        if( inQuotes )
        {
            // Inside quotes, add characters directly (including spaces)
            if( aGroup[i] == '\\' && i + 1 < groupLen )
            {
                // Handle escaped characters inside quotes
                tmp += aGroup[++i];
            }
            else
            {
                tmp += aGroup[i];
            }
 
            continue;
        }
 
        if( aGroup[i] == '{' )
        {
            if( i > 0 && isSuperSubOverbar( aGroup[i-1] ) )
            {
                braceNesting++;
 
                // Keep the full formatting notation (e.g. ~{CAS}) in the member name.
                // A net named ~{CAS} is distinct from CAS, and stripping the marker
                // would lose that identity.  Vector bus members like D_{[1..2]} also
                // preserve their subscript so recursive ForEachBusMember can parse them.
                tmp += wxT( '{' );
                continue;
            }
            else
                return false;
        }
        else if( aGroup[i] == '}' )
        {
            if( braceNesting )
            {
                braceNesting--;
                tmp += wxT( '}' );
                continue;
            }
            else
            {
                if( aMemberList && !tmp.IsEmpty() )
                    aMemberList->push_back( EscapeString( escapeSpacesForBus( tmp ), CTX_NETNAME ) );
 
                return true;
            }
        }
 
        // Handle backslash-escaped spaces in member names
        if( aGroup[i] == '\\' && i + 1 < groupLen && aGroup[i + 1] == ' ' )
        {
            tmp += aGroup[++i];
            continue;
        }
 
        // Unescaped space or comma separates members
        if( aGroup[i] == ' ' || aGroup[i] == ',' )
        {
            if( aMemberList && !tmp.IsEmpty() )
                aMemberList->push_back( EscapeString( escapeSpacesForBus( tmp ), CTX_NETNAME ) );
 
            tmp.Clear();
            continue;
        }
 
        tmp += aGroup[i];
    }
 
    return false;
}
 
 
void NET_SETTINGS::ForEachBusMember( const wxString&                              aBusPattern,
                                     const std::function<void( const wxString& )>& aFunction )
{
    std::vector<wxString> members;
 
    if( ParseBusVector( aBusPattern, nullptr, &members ) )
    {
        // Vector bus: call function for each expanded member
        for( const wxString& member : members )
            aFunction( member );
    }
    else if( ParseBusGroup( aBusPattern, nullptr, &members ) )
    {
        // Bus group: recursively expand each member (which may itself be a vector or group)
        for( const wxString& member : members )
            ForEachBusMember( member, aFunction );
    }
    else
    {
        // Not a bus pattern: call function with the original pattern
        aFunction( aBusPattern );
    }
}