drc_re_rule_loader.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 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 "drc_re_rule_loader.h"
 
#include <reporter.h>
#include <component_classes/component_class_assignment_rule.h>
#include <drc/drc_rule_parser.h>
#include <drc/drc_rule_condition.h>
#include <wx/ffile.h>
 
#include "drc_re_via_style_constraint_data.h"
#include "drc_re_rtg_diff_pair_constraint_data.h"
#include "drc_re_min_txt_ht_th_constraint_data.h"
#include "drc_re_routing_width_constraint_data.h"
#include "drc_re_abs_length_two_constraint_data.h"
#include "drc_re_numeric_input_constraint_data.h"
#include "drc_re_custom_rule_constraint_data.h"
#include "drc_re_bool_input_constraint_data.h"
#include "drc_re_vias_under_smd_constraint_data.h"
#include "drc_re_allowed_orientation_constraint_data.h"
#include "drc_re_permitted_layers_constraint_data.h"
#include "drc_re_numeric_constraint_types.h"
#include "drc_re_custom_rule_constraint_data.h"
#include "drc_rule_editor_utils.h"
 
 
DRC_RULE_LOADER::DRC_RULE_LOADER()
{
}
 
 
double DRC_RULE_LOADER::toMM( int aValue )
{
    return aValue / 1000000.0;
}
 
 
const DRC_CONSTRAINT* DRC_RULE_LOADER::findConstraint( const DRC_RULE& aRule, DRC_CONSTRAINT_T aType )
{
    for( const DRC_CONSTRAINT& constraint : aRule.m_Constraints )
    {
        if( constraint.m_Type == aType )
            return &constraint;
    }
 
    return nullptr;
}
 
 
static bool isSymmetricMinOptMax( const DRC_CONSTRAINT* aConstraint )
{
    if( !aConstraint )
        return true;
 
    const auto& value = aConstraint->GetValue();
 
    if( !value.HasMin() || !value.HasOpt() || !value.HasMax() )
        return true;
 
    return ( value.Opt() - value.Min() ) == ( value.Max() - value.Opt() );
}
 
 
static std::shared_ptr<DRC_RE_BASE_CONSTRAINT_DATA> makeCustomRuleData( const DRC_RULE& aRule )
{
    auto customData = std::make_shared<DRC_RE_CUSTOM_RULE_CONSTRAINT_DATA>();
    customData->SetRuleName( aRule.m_Name );
    return customData;
}
 
 
wxString DRC_RULE_LOADER::ExtractRuleBody( const wxString& aOriginalText )
{
    int ruleKeyword = aOriginalText.Find( wxS( "rule " ) );
    if( ruleKeyword == wxNOT_FOUND )
        return aOriginalText;
 
    int bodyStart = aOriginalText.find( '(', ruleKeyword + 5 );
    if( bodyStart == (int) wxString::npos )
        return aOriginalText;
 
    wxString body = aOriginalText.Mid( bodyStart );
    body.Trim( true );
 
    if( body.EndsWith( wxS( ")" ) ) )
        body = body.Left( body.Length() - 1 );
    body.Trim( true );
 
    return body;
}
 
 
wxString DRC_RULE_LOADER::ExtractRuleComment( const wxString& aOriginalText )
{
    wxString      comment;
    wxArrayString lines = wxSplit( aOriginalText, '\n', '\0' );
 
    for( const wxString& line : lines )
    {
        wxString trimmed = line;
        trimmed.Trim( false );
 
        if( trimmed.StartsWith( wxS( "#" ) ) )
        {
            wxString commentLine = trimmed.Mid( 1 );
            commentLine.Trim( false );
 
            if( !comment.IsEmpty() )
                comment += wxS( "\n" );
 
            comment += commentLine;
        }
    }
 
    return comment;
}
 
 
wxString DRC_RULE_LOADER::cleanStrippedCondition( const wxString& aCondition )
{
    wxString cleaned = aCondition;
 
    // Strip empty parentheses left over from removing conditions
    wxString prev;
    do
    {
        prev = cleaned;
        cleaned.Replace( wxS( "()" ), wxS( "" ) );
    } while( cleaned != prev );
 
    cleaned.Replace( wxS( "&& &&" ), wxS( "&&" ) );
    cleaned.Replace( wxS( "|| ||" ), wxS( "||" ) );
    cleaned.Trim( true ).Trim( false );
    if( cleaned.StartsWith( wxS( "&&" ) ) )
        cleaned = cleaned.Mid( 2 ).Trim( false );
    if( cleaned.EndsWith( wxS( "&&" ) ) )
        cleaned = cleaned.Left( cleaned.Length() - 2 ).Trim( true );
    if( cleaned.StartsWith( wxS( "||" ) ) )
        cleaned = cleaned.Mid( 2 ).Trim( false );
    if( cleaned.EndsWith( wxS( "||" ) ) )
        cleaned = cleaned.Left( cleaned.Length() - 2 ).Trim( true );
 
    return cleaned;
}
 
 
std::shared_ptr<DRC_RE_BASE_CONSTRAINT_DATA>
DRC_RULE_LOADER::createConstraintData( DRC_RULE_EDITOR_CONSTRAINT_NAME   aPanel,
                                        const DRC_RULE&                   aRule,
                                        const std::set<DRC_CONSTRAINT_T>& aClaimedConstraints )
{
    switch( aPanel )
    {
    case VIA_STYLE:
    {
        auto data = std::make_shared<DRC_RE_VIA_STYLE_CONSTRAINT_DATA>();
        data->SetRuleName( aRule.m_Name );
        data->SetConstraintCode( "via_style" );
 
        const DRC_CONSTRAINT* viaDia = findConstraint( aRule, VIA_DIAMETER_CONSTRAINT );
        const DRC_CONSTRAINT* holeSize = findConstraint( aRule, HOLE_SIZE_CONSTRAINT );
 
        if( viaDia )
        {
            data->SetMinViaDiameter( toMM( viaDia->GetValue().Min() ) );
            data->SetMaxViaDiameter( toMM( viaDia->GetValue().Max() ) );
        }
 
        if( holeSize )
        {
            data->SetMinViaHoleSize( toMM( holeSize->GetValue().Min() ) );
            data->SetMaxViaHoleSize( toMM( holeSize->GetValue().Max() ) );
        }
 
        if( aRule.m_Condition )
        {
            wxString expr = aRule.m_Condition->GetExpression();
 
            if( expr.Contains( wxS( "'Micro'" ) ) )
                data->SetViaType( VIA_STYLE_TYPE::MICRO );
            else if( expr.Contains( wxS( "'Through'" ) ) )
                data->SetViaType( VIA_STYLE_TYPE::THROUGH );
            else if( expr.Contains( wxS( "'Blind'" ) ) )
                data->SetViaType( VIA_STYLE_TYPE::BLIND );
            else if( expr.Contains( wxS( "'Buried'" ) ) )
                data->SetViaType( VIA_STYLE_TYPE::BURIED );
 
            // Strip the via type condition so it doesn't duplicate on save
            wxString cleanedCondition = expr;
            cleanedCondition.Replace( wxS( "A.Via_Type == 'Micro'" ), wxS( "" ) );
            cleanedCondition.Replace( wxS( "A.Via_Type == 'Through'" ), wxS( "" ) );
            cleanedCondition.Replace( wxS( "A.Via_Type == 'Blind'" ), wxS( "" ) );
            cleanedCondition.Replace( wxS( "A.Via_Type == 'Buried'" ), wxS( "" ) );
 
            data->SetRuleCondition( cleanStrippedCondition( cleanedCondition ) );
        }
 
        return data;
    }
 
    case ROUTING_DIFF_PAIR:
    {
        const DRC_CONSTRAINT* trackWidth = findConstraint( aRule, TRACK_WIDTH_CONSTRAINT );
        const DRC_CONSTRAINT* diffGap = findConstraint( aRule, DIFF_PAIR_GAP_CONSTRAINT );
        const DRC_CONSTRAINT* uncoupled = findConstraint( aRule, MAX_UNCOUPLED_CONSTRAINT );
 
        if( !isSymmetricMinOptMax( trackWidth ) || !isSymmetricMinOptMax( diffGap ) )
        {
            return makeCustomRuleData( aRule );
        }
 
        auto data = std::make_shared<DRC_RE_ROUTING_DIFF_PAIR_CONSTRAINT_DATA>();
        data->SetRuleName( aRule.m_Name );
        data->SetConstraintCode( "diff_pair_gap" );
 
        if( trackWidth )
        {
            double opt = toMM( trackWidth->GetValue().Opt() );
            double min = toMM( trackWidth->GetValue().Min() );
            data->SetOptWidth( opt );
            data->SetWidthTolerance( opt - min );
        }
 
        if( diffGap )
        {
            double opt = toMM( diffGap->GetValue().Opt() );
            double min = toMM( diffGap->GetValue().Min() );
            data->SetOptGap( opt );
            data->SetGapTolerance( opt - min );
        }
 
        if( uncoupled )
        {
            data->SetMaxUncoupledLength( toMM( uncoupled->GetValue().Max() ) );
        }
 
        return data;
    }
 
    case MINIMUM_TEXT_HEIGHT_AND_THICKNESS:
    {
        auto data = std::make_shared<DRC_RE_MINIMUM_TEXT_HEIGHT_THICKNESS_CONSTRAINT_DATA>();
        data->SetRuleName( aRule.m_Name );
        data->SetConstraintCode( "text_height" );
 
        const DRC_CONSTRAINT* textHeight = findConstraint( aRule, TEXT_HEIGHT_CONSTRAINT );
        const DRC_CONSTRAINT* textThickness = findConstraint( aRule, TEXT_THICKNESS_CONSTRAINT );
 
        if( textHeight )
            data->SetMinTextHeight( toMM( textHeight->GetValue().Min() ) );
 
        if( textThickness )
            data->SetMinTextThickness( toMM( textThickness->GetValue().Min() ) );
 
        return data;
    }
 
    case ROUTING_WIDTH:
    {
        const DRC_CONSTRAINT* trackWidth = findConstraint( aRule, TRACK_WIDTH_CONSTRAINT );
 
        if( !isSymmetricMinOptMax( trackWidth ) )
            return makeCustomRuleData( aRule );
 
        auto data = std::make_shared<DRC_RE_ROUTING_WIDTH_CONSTRAINT_DATA>();
        data->SetRuleName( aRule.m_Name );
        data->SetConstraintCode( "track_width" );
 
        if( trackWidth )
        {
            double opt = toMM( trackWidth->GetValue().Opt() );
            double min = toMM( trackWidth->GetValue().Min() );
 
            data->SetOptWidth( opt );
            data->SetWidthTolerance( opt - min );
        }
 
        return data;
    }
 
    case ABSOLUTE_LENGTH:
    {
        const DRC_CONSTRAINT* length = findConstraint( aRule, LENGTH_CONSTRAINT );
 
        if( !isSymmetricMinOptMax( length ) )
            return makeCustomRuleData( aRule );
 
        auto data = std::make_shared<DRC_RE_ABSOLUTE_LENGTH_TWO_CONSTRAINT_DATA>();
        data->SetRuleName( aRule.m_Name );
        data->SetConstraintCode( "length" );
 
        if( length )
        {
            double minMM = toMM( length->GetValue().Min() );
            double optMM = toMM( length->GetValue().Opt() );
            double maxMM = toMM( length->GetValue().Max() );
            data->SetOptimumLength( optMM );
            data->SetTolerance( ( maxMM - minMM ) / 2.0 );
        }
 
        return data;
    }
 
    case MATCHED_LENGTH_DIFF_PAIR:
    {
        const DRC_CONSTRAINT* length = findConstraint( aRule, LENGTH_CONSTRAINT );
 
        if( !isSymmetricMinOptMax( length ) )
            return makeCustomRuleData( aRule );
 
        auto data = std::make_shared<DRC_RE_MATCHED_LENGTH_DIFF_PAIR_CONSTRAINT_DATA>();
        data->SetRuleName( aRule.m_Name );
        data->SetConstraintCode( "length" );
 
        if( length )
        {
            double minMM = toMM( length->GetValue().Min() );
            double optMM = toMM( length->GetValue().Opt() );
            double maxMM = toMM( length->GetValue().Max() );
            data->SetOptimumLength( optMM );
            data->SetTolerance( ( maxMM - minMM ) / 2.0 );
        }
 
        const DRC_CONSTRAINT* skew = findConstraint( aRule, SKEW_CONSTRAINT );
 
        if( skew )
        {
            data->SetMaxSkew( toMM( skew->GetValue().Max() ) );
            data->SetWithinDiffPairs( skew->GetOption( DRC_CONSTRAINT::OPTIONS::SKEW_WITHIN_DIFF_PAIRS ) );
        }
 
        return data;
    }
 
    case PERMITTED_LAYERS:
    {
        auto data = std::make_shared<DRC_RE_PERMITTED_LAYERS_CONSTRAINT_DATA>();
        data->SetRuleName( aRule.m_Name );
 
        const DRC_CONSTRAINT* constraint = findConstraint( aRule, ASSERTION_CONSTRAINT );
 
        if( constraint && constraint->m_Test )
        {
            wxString expr = constraint->m_Test->GetExpression();
 
            data->SetTopLayerEnabled( expr.Contains( wxS( "F.Cu" ) ) );
            data->SetBottomLayerEnabled( expr.Contains( wxS( "B.Cu" ) ) );
 
            // Check for layer references the panel can't represent
            wxString remaining = expr;
            remaining.Replace( wxS( "A.Layer == 'F.Cu'" ), wxS( "" ) );
            remaining.Replace( wxS( "A.Layer == 'B.Cu'" ), wxS( "" ) );
 
            if( remaining.Contains( wxS( "A.Layer" ) ) )
            {
                // Inner or non-standard layers — fall back to custom rule
                auto customData = std::make_shared<DRC_RE_CUSTOM_RULE_CONSTRAINT_DATA>();
                customData->SetRuleName( aRule.m_Name );
                return customData;
            }
        }
 
        return data;
    }
 
    case ALLOWED_ORIENTATION:
    {
        auto data = std::make_shared<DRC_RE_ALLOWED_ORIENTATION_CONSTRAINT_DATA>();
        data->SetRuleName( aRule.m_Name );
        data->SetConstraintCode( wxS( "allowed_orientation" ) );
 
        const DRC_CONSTRAINT* constraint = findConstraint( aRule, ASSERTION_CONSTRAINT );
 
        if( constraint && constraint->m_Test )
        {
            wxString expr = constraint->m_Test->GetExpression();
 
            data->SetIsZeroDegreesAllowed( expr.Contains( wxS( "== 0 deg" ) ) );
            data->SetIsNinetyDegreesAllowed( expr.Contains( wxS( "== 90 deg" ) ) );
            data->SetIsOneEightyDegreesAllowed( expr.Contains( wxS( "== 180 deg" ) ) );
            data->SetIsTwoSeventyDegreesAllowed( expr.Contains( wxS( "== 270 deg" ) ) );
 
            if( data->GetIsZeroDegreesAllowed() && data->GetIsNinetyDegreesAllowed()
                && data->GetIsOneEightyDegreesAllowed() && data->GetIsTwoSeventyDegreesAllowed() )
            {
                data->SetIsAllDegreesAllowed( true );
                return data;
            }
 
            if( data->GetIsZeroDegreesAllowed() || data->GetIsNinetyDegreesAllowed()
                || data->GetIsOneEightyDegreesAllowed() || data->GetIsTwoSeventyDegreesAllowed() )
            {
                return data;
            }
 
            // Non-standard angles cannot be represented by the
            // orientation panel, fall back to custom rule
            auto customData = std::make_shared<DRC_RE_CUSTOM_RULE_CONSTRAINT_DATA>();
            customData->SetRuleName( aRule.m_Name );
            return customData;
        }
        else
        {
            data->SetIsAllDegreesAllowed( true );
        }
 
        return data;
    }
 
    case VIAS_UNDER_SMD:
    {
        auto data = std::make_shared<DRC_RE_VIAS_UNDER_SMD_CONSTRAINT_DATA>();
        data->SetRuleName( aRule.m_Name );
        data->SetConstraintCode( wxS( "disallow_via" ) );
 
        const DRC_CONSTRAINT* constraint = findConstraint( aRule, DISALLOW_CONSTRAINT );
 
        if( constraint )
        {
            data->SetDisallowThroughVias( ( constraint->m_DisallowFlags & DRC_DISALLOW_THROUGH_VIAS ) != 0 );
            data->SetDisallowMicroVias( ( constraint->m_DisallowFlags & DRC_DISALLOW_MICRO_VIAS ) != 0 );
            data->SetDisallowBlindVias( ( constraint->m_DisallowFlags & DRC_DISALLOW_BLIND_VIAS ) != 0 );
            data->SetDisallowBuriedVias( ( constraint->m_DisallowFlags & DRC_DISALLOW_BURIED_VIAS ) != 0 );
        }
 
        return data;
    }
 
    case CUSTOM_RULE:
    {
        auto data = std::make_shared<DRC_RE_CUSTOM_RULE_CONSTRAINT_DATA>();
        data->SetRuleName( aRule.m_Name );
        return data;
    }
 
    default:
    {
        // For numeric input types, create a generic numeric constraint data
        if( DRC_RULE_EDITOR_UTILS::IsNumericInputType( aPanel ) )
        {
            auto data = DRC_RULE_EDITOR_UTILS::CreateNumericConstraintData( aPanel );
            data->SetRuleName( aRule.m_Name );
 
            wxString code = DRC_RULE_EDITOR_UTILS::GetConstraintCode( aPanel );
            data->SetConstraintCode( code );
 
            // Find the first matching constraint from the claimed set
            for( DRC_CONSTRAINT_T type : aClaimedConstraints )
            {
                const DRC_CONSTRAINT* constraint = findConstraint( aRule, type );
 
                if( constraint )
                {
                    if( type == VIA_COUNT_CONSTRAINT )
                        data->SetNumericInputValue( constraint->GetValue().Max() );
                    else if( type == MIN_RESOLVED_SPOKES_CONSTRAINT )
                        data->SetNumericInputValue( constraint->GetValue().Min() );
                    else
                        data->SetNumericInputValue( toMM( constraint->GetValue().Min() ) );
 
                    break;
                }
            }
 
            return data;
        }
 
        // Fallback to custom rule
        auto data = std::make_shared<DRC_RE_CUSTOM_RULE_CONSTRAINT_DATA>();
        data->SetRuleName( aRule.m_Name );
        return data;
    }
    }
}
 
 
std::vector<DRC_RE_LOADED_PANEL_ENTRY> DRC_RULE_LOADER::LoadRule( const DRC_RULE& aRule,
                                                                   const wxString& aOriginalText )
{
    std::vector<DRC_RE_LOADED_PANEL_ENTRY> entries;
 
    // Get condition expression if present
    wxString condition;
 
    if( aRule.m_Condition )
        condition = aRule.m_Condition->GetExpression();
 
    // Match the rule to panels
    std::vector<DRC_PANEL_MATCH> matches = m_matcher.MatchRule( aRule );
 
    for( DRC_PANEL_MATCH& match : matches )
    {
        if( match.panelType == PERMITTED_LAYERS && match.claimedConstraints.count( ASSERTION_CONSTRAINT ) )
        {
            const DRC_CONSTRAINT* assertion = findConstraint( aRule, ASSERTION_CONSTRAINT );
 
            if( assertion && assertion->m_Test )
            {
                wxString expr = assertion->m_Test->GetExpression();
 
                if( expr.Contains( wxS( "Orientation" ) ) && !expr.Contains( wxS( "Layer" ) ) )
                    match.panelType = ALLOWED_ORIENTATION;
            }
        }
 
        if( match.panelType == SILK_TO_SILK_CLEARANCE && match.claimedConstraints.count( SILK_CLEARANCE_CONSTRAINT ) )
        {
            if( !condition.IsEmpty()
                && ( condition.Contains( wxS( "L == 'F.Mask'" ) ) || condition.Contains( wxS( "L == 'B.Mask'" ) ) ) )
            {
                match.panelType = SILK_TO_SOLDERMASK_CLEARANCE;
            }
            else if( !condition.IsEmpty() && !condition.Contains( wxS( "L == 'F.SilkS'" ) )
                     && !condition.Contains( wxS( "L == 'B.SilkS'" ) ) )
            {
                match.panelType = CUSTOM_RULE;
            }
        }
 
        auto constraintData = createConstraintData( match.panelType, aRule, match.claimedConstraints );
 
        if( !constraintData )
            continue;
 
        // If createConstraintData returned a custom rule fallback (e.g. non-standard
        // orientation angles), update the panel type to match the actual data type
        auto customFallback = std::dynamic_pointer_cast<DRC_RE_CUSTOM_RULE_CONSTRAINT_DATA>( constraintData );
 
        if( customFallback && match.panelType != CUSTOM_RULE )
        {
            match.panelType = CUSTOM_RULE;
        }
 
        if( match.panelType == SILK_TO_SOLDERMASK_CLEARANCE )
        {
            wxString cleanedCondition = condition;
 
            // New format: L == 'F.Mask' || L == 'B.Mask'
            bool hasBothSides = condition.Contains( wxS( "L == 'F.Mask' || L == 'B.Mask'" ) );
 
            if( hasBothSides )
            {
                constraintData->SetLayers( { F_SilkS, B_SilkS } );
                constraintData->SetLayerSource( wxS( "" ) );
 
                cleanedCondition.Replace( wxS( "L == 'F.Mask' || L == 'B.Mask'" ), wxS( "" ) );
            }
            else
            {
                bool         isFront = condition.Contains( wxS( "F.Mask" ) );
                PCB_LAYER_ID layer = isFront ? F_SilkS : B_SilkS;
                constraintData->SetLayers( { layer } );
                constraintData->SetLayerSource( isFront ? wxS( "F.SilkS" ) : wxS( "B.SilkS" ) );
 
                cleanedCondition.Replace( wxS( "L == 'F.Mask'" ), wxS( "" ) );
                cleanedCondition.Replace( wxS( "L == 'B.Mask'" ), wxS( "" ) );
            }
 
            constraintData->SetRuleCondition( cleanStrippedCondition( cleanedCondition ) );
        }
 
        if( match.panelType == SILK_TO_SILK_CLEARANCE )
        {
            wxString cleanedCondition = condition;
 
            bool hasBothSides = condition.Contains( wxS( "L == 'F.SilkS' || L == 'B.SilkS'" ) );
 
            if( hasBothSides )
            {
                constraintData->SetLayers( { F_SilkS, B_SilkS } );
                constraintData->SetLayerSource( wxS( "" ) );
 
                cleanedCondition.Replace( wxS( "L == 'F.SilkS' || L == 'B.SilkS'" ), wxS( "" ) );
            }
            else if( condition.Contains( wxS( "L == 'F.SilkS'" ) ) || condition.Contains( wxS( "L == 'B.SilkS'" ) ) )
            {
                bool         isFront = condition.Contains( wxS( "F.SilkS" ) );
                PCB_LAYER_ID layer = isFront ? F_SilkS : B_SilkS;
                constraintData->SetLayers( { layer } );
                constraintData->SetLayerSource( isFront ? wxS( "F.SilkS" ) : wxS( "B.SilkS" ) );
 
                cleanedCondition.Replace( wxS( "L == 'F.SilkS'" ), wxS( "" ) );
                cleanedCondition.Replace( wxS( "L == 'B.SilkS'" ), wxS( "" ) );
            }
 
            constraintData->SetRuleCondition( cleanStrippedCondition( cleanedCondition ) );
        }
 
        if( match.panelType == VIAS_UNDER_SMD )
        {
            wxString cleanedCondition = condition;
 
            cleanedCondition.Replace( wxS( "A.Pad_Type == 'SMD'" ), wxS( "" ) );
            cleanedCondition.Replace( wxS( "B.Pad_Type == 'SMD'" ), wxS( "" ) );
 
            constraintData->SetRuleCondition( cleanStrippedCondition( cleanedCondition ) );
        }
 
        if( match.panelType == CUSTOM_RULE && customFallback )
        {
            customFallback->SetRuleText( ExtractRuleBody( aOriginalText ) );
        }
 
        if( match.panelType != VIA_STYLE && match.panelType != SILK_TO_SOLDERMASK_CLEARANCE
            && match.panelType != SILK_TO_SILK_CLEARANCE && match.panelType != VIAS_UNDER_SMD )
            constraintData->SetRuleCondition( condition );
 
        DRC_RE_LOADED_PANEL_ENTRY entry( match.panelType, constraintData, aRule.m_Name, condition, aRule.m_Severity,
                                         aRule.m_LayerCondition );
 
        // Preserve original layer source text for round-trip fidelity
        wxString source = aRule.m_LayerSource;
        if( source.StartsWith( wxS( "'" ) ) && source.EndsWith( wxS( "'" ) ) )
            source = source.Mid( 1, source.Length() - 2 );
        entry.layerSource = source;
 
        wxString comment = ExtractRuleComment( aOriginalText );
        if( !comment.IsEmpty() )
            constraintData->SetComment( comment );
 
        // Store original text only for the first entry to avoid duplication issues
        if( entries.empty() )
            entry.originalRuleText = aOriginalText;
 
        entries.push_back( std::move( entry ) );
    }
 
    // If no matches, create a custom rule entry
    if( entries.empty() )
    {
        auto customData = std::make_shared<DRC_RE_CUSTOM_RULE_CONSTRAINT_DATA>();
        customData->SetRuleName( aRule.m_Name );
        customData->SetRuleCondition( condition );
 
        wxString comment = ExtractRuleComment( aOriginalText );
        if( !comment.IsEmpty() )
            customData->SetComment( comment );
 
        customData->SetRuleText( ExtractRuleBody( aOriginalText ) );
 
        DRC_RE_LOADED_PANEL_ENTRY entry( CUSTOM_RULE, customData, aRule.m_Name, condition,
                                         aRule.m_Severity, aRule.m_LayerCondition );
        wxString                  source = aRule.m_LayerSource;
        if( source.StartsWith( wxS( "'" ) ) && source.EndsWith( wxS( "'" ) ) )
            source = source.Mid( 1, source.Length() - 2 );
        entry.layerSource = source;
        entry.originalRuleText = aOriginalText;
        entries.push_back( std::move( entry ) );
    }
 
    return entries;
}
 
 
std::vector<DRC_RE_LOADED_PANEL_ENTRY> DRC_RULE_LOADER::LoadFromString( const wxString& aRulesText )
{
    std::vector<DRC_RE_LOADED_PANEL_ENTRY> allEntries;
    std::vector<std::shared_ptr<DRC_RULE>> parsedRules;
 
    wxString rulesText = aRulesText;
 
    if( !rulesText.Contains( "(version" ) )
        rulesText.Prepend( "(version 1)\n" );
 
    try
    {
        DRC_RULES_PARSER parser( rulesText, "Rule Loader" );
        parser.Parse( parsedRules, nullptr );
    }
    catch( const IO_ERROR& )
    {
        return allEntries;
    }
 
    for( const auto& rule : parsedRules )
    {
        // Extract the actual original text from the file content
        wxString originalText = ExtractRuleText( aRulesText, rule->m_Name );
 
        std::vector<DRC_RE_LOADED_PANEL_ENTRY> ruleEntries = LoadRule( *rule, originalText );
 
        for( auto& entry : ruleEntries )
            allEntries.push_back( std::move( entry ) );
    }
 
    return allEntries;
}
 
 
wxString DRC_RULE_LOADER::ExtractRuleText( const wxString& aContent, const wxString& aRuleName )
{
    // Search for the rule by name, handling both quoted and unquoted names.
    // The quoted form includes the closing quote as a boundary so partial
    // matches like "Clearance" vs "Clearance for BGA" are not possible.
    // The unquoted form needs an explicit boundary check.
    wxString quotedSearch = wxString::Format( wxS( "(rule \"%s\"" ), aRuleName );
    wxString unquotedSearch = wxString::Format( wxS( "(rule %s" ), aRuleName );
 
    size_t startPos = aContent.find( quotedSearch );
 
    if( startPos == wxString::npos )
    {
        size_t pos = 0;
 
        while( ( pos = aContent.find( unquotedSearch, pos ) ) != wxString::npos )
        {
            size_t afterMatch = pos + unquotedSearch.length();
 
            if( afterMatch >= aContent.length()
                || aContent[afterMatch] == ')'
                || aContent[afterMatch] == ' '
                || aContent[afterMatch] == '\n'
                || aContent[afterMatch] == '\r'
                || aContent[afterMatch] == '\t' )
            {
                startPos = pos;
                break;
            }
 
            pos = afterMatch;
        }
    }
 
    if( startPos == wxString::npos )
        return wxEmptyString;
 
    // Find the matching closing parenthesis by counting balanced parens
    int parenCount = 0;
    size_t endPos = startPos;
    bool inString = false;
    bool escaped = false;
 
    for( size_t i = startPos; i < aContent.length(); ++i )
    {
        wxUniChar c = aContent[i];
 
        if( escaped )
        {
            escaped = false;
            continue;
        }
 
        if( c == '\\' )
        {
            escaped = true;
            continue;
        }
 
        if( c == '"' )
        {
            inString = !inString;
            continue;
        }
 
        if( inString )
            continue;
 
        if( c == '(' )
        {
            parenCount++;
        }
        else if( c == ')' )
        {
            parenCount--;
 
            if( parenCount == 0 )
            {
                endPos = i;
                break;
            }
        }
    }
 
    if( parenCount != 0 )
        return wxEmptyString;
 
    return aContent.Mid( startPos, endPos - startPos + 1 );
}
 
 
std::vector<DRC_RE_LOADED_PANEL_ENTRY> DRC_RULE_LOADER::LoadFile( const wxString& aPath )
{
    std::vector<DRC_RE_LOADED_PANEL_ENTRY> allEntries;
 
    wxFFile file( aPath, "r" );
 
    if( !file.IsOpened() )
        return allEntries;
 
    wxString content;
    file.ReadAll( &content );
    file.Close();
 
    return LoadFromString( content );
}