Implement hierarchical component classes

This ensures that hierarchical sheets inside a rule are with a
component class attached pass that component class down the
schematic hierarchy.

eeschema/netlist_exporters/netlist_exporter_xml.cpp

@@ -37,6 +37,7 @@
 #include <xnode.h>      // also nests: <wx/xml/xml.h>
 #include <json_common.h>
 #include <project_sch.h>
+#include <sch_rule_area.h>
 #include <trace_helpers.h>
 
 #include <set>
@@ -253,6 +254,7 @@ XNODE* NETLIST_EXPORTER_XML::makeSymbols( unsigned aCtl )
 
     m_referencesAlreadyFound.Clear();
     m_libParts.clear();
+    getSheetComponentClasses();
 
     SCH_SHEET_PATH currentSheet = m_schematic->CurrentSheet();
     SCH_SHEET_LIST sheetList = m_schematic->Hierarchy();
@@ -572,21 +574,24 @@ XNODE* NETLIST_EXPORTER_XML::makeGroups()
 std::vector<wxString> NETLIST_EXPORTER_XML::getComponentClassNamesForAllSymbolUnits(
         SCH_SYMBOL* aSymbol, const SCH_SHEET_PATH& aSymbolSheet, const SCH_SHEET_LIST& aSheetList )
 {
+    std::vector<SCH_SHEET_PATH> symbolSheets;
+    symbolSheets.push_back( aSymbolSheet );
+
     std::unordered_set<wxString> compClassNames = aSymbol->GetComponentClassNames( &aSymbolSheet );
     int                          primaryUnit = aSymbol->GetUnitSelection( &aSymbolSheet );
 
     if( aSymbol->GetUnitCount() > 1 )
     {
-        wxString ref = aSymbol->GetRef( &aSymbolSheet );
+        const wxString ref = aSymbol->GetRef( &aSymbolSheet );
 
         for( const SCH_SHEET_PATH& sheet : aSheetList )
         {
             for( SCH_ITEM* item : sheet.LastScreen()->Items().OfType( SCH_SYMBOL_T ) )
             {
-                SCH_SYMBOL* symbol2 = static_cast<SCH_SYMBOL*>( item );
+                const SCH_SYMBOL* symbol2 = static_cast<SCH_SYMBOL*>( item );
 
-                wxString ref2 = symbol2->GetRef( &sheet );
-                int      otherUnit = symbol2->GetUnitSelection( &sheet );
+                wxString  ref2 = symbol2->GetRef( &sheet );
+                const int otherUnit = symbol2->GetUnitSelection( &sheet );
 
                 if( ref2.CmpNoCase( ref ) != 0 )
                     continue;
@@ -594,6 +599,8 @@ std::vector<wxString> NETLIST_EXPORTER_XML::getComponentClassNamesForAllSymbolUn
                 if( otherUnit == primaryUnit )
                     continue;
 
+                symbolSheets.push_back( sheet );
+
                 std::unordered_set<wxString> otherClassNames =
                         symbol2->GetComponentClassNames( &sheet );
                 compClassNames.insert( otherClassNames.begin(), otherClassNames.end() );
@@ -601,6 +608,18 @@ std::vector<wxString> NETLIST_EXPORTER_XML::getComponentClassNamesForAllSymbolUn
         }
     }
 
+    // Add sheet-level component classes
+    for( auto& [sheetPath, sheetCompClasses] : m_sheetComponentClasses )
+    {
+        for( SCH_SHEET_PATH& symbolSheetPath : symbolSheets )
+        {
+            if( symbolSheetPath.IsContainedWithin( sheetPath ) )
+            {
+                compClassNames.insert( sheetCompClasses.begin(), sheetCompClasses.end() );
+            }
+        }
+    }
+
     std::vector<wxString> sortedCompClassNames( compClassNames.begin(), compClassNames.end() );
     std::sort( sortedCompClassNames.begin(), sortedCompClassNames.end(),
                []( const wxString& str1, const wxString& str2 )
@@ -1100,3 +1119,51 @@ static bool sortPinsByNumber( SCH_PIN* aPin1, SCH_PIN* aPin2 )
     // return "lhs < rhs"
     return StrNumCmp( aPin1->GetShownNumber(), aPin2->GetShownNumber(), true ) < 0;
 }
+void NETLIST_EXPORTER_XML::getSheetComponentClasses()
+{
+    m_sheetComponentClasses.clear();
+
+    SCH_SHEET_LIST sheetList = m_schematic->Hierarchy();
+
+    auto getComponentClassFields = [&]( const std::vector<SCH_FIELD>& fields, const SCH_SHEET_PATH* sheetPath )
+    {
+        std::unordered_set<wxString> componentClasses;
+
+        for( const SCH_FIELD& field : fields )
+        {
+            if( field.GetCanonicalName() == wxT( "Component Class" ) )
+            {
+                if( field.GetShownText( sheetPath, false ) != wxEmptyString )
+                    componentClasses.insert( field.GetShownText( sheetPath, false ) );
+            }
+        }
+
+        return componentClasses;
+    };
+
+    for( const SCH_SHEET_PATH& sheet : sheetList )
+    {
+        for( SCH_ITEM* item : sheet.LastScreen()->Items().OfType( SCH_SHEET_T ) )
+        {
+            SCH_SHEET*                                sheetItem = static_cast<SCH_SHEET*>( item );
+            std::unordered_set<wxString>              sheetComponentClasses;
+            const std::unordered_set<SCH_RULE_AREA*>& sheetRuleAreas = sheetItem->GetRuleAreaCache();
+
+            for( const SCH_RULE_AREA* ruleArea : sheetRuleAreas )
+            {
+                for( const SCH_DIRECTIVE_LABEL* label : ruleArea->GetDirectives() )
+                {
+                    std::unordered_set<wxString> ruleAreaComponentClasses =
+                            getComponentClassFields( label->GetFields(), &sheet );
+                    sheetComponentClasses.insert( ruleAreaComponentClasses.begin(), ruleAreaComponentClasses.end() );
+                }
+            }
+
+            SCH_SHEET_PATH newPath = sheet;
+            newPath.push_back( sheetItem );
+            wxASSERT( !m_sheetComponentClasses.contains( newPath ) );
+
+            m_sheetComponentClasses[newPath] = sheetComponentClasses;
+        }
+    }
+}

eeschema/netlist_exporters/netlist_exporter_xml.h

@@ -148,7 +148,12 @@ protected:
     bool                m_resolveTextVars;   // Export textVar references resolved
 
 private:
+    void getSheetComponentClasses();
+
     std::set<wxString>  m_libraries;         // Set of library nicknames.
+
+    /// Map of all sheets to component classes covering the whole sheet
+    std::map<SCH_SHEET_PATH, std::unordered_set<wxString>> m_sheetComponentClasses;
 };
 
 #endif

eeschema/sch_rule_area.cpp

@@ -250,7 +250,7 @@ void SCH_RULE_AREA::RefreshContainedItemsAndDirectives( SCH_SCREEN* screen )
                          { SCH_PIN_T, SCH_LABEL_T, SCH_GLOBAL_LABEL_T, SCH_HIER_LABEL_T } ) )
         {
             std::vector<VECTOR2I> connectionPoints = areaItem->GetConnectionPoints();
-            assert( connectionPoints.size() == 1 );
+            wxASSERT( connectionPoints.size() == 1 );
 
             if( GetPolyShape().Collide( connectionPoints[0] ) )
                 addContainedItem( areaItem );
@@ -273,6 +273,16 @@ void SCH_RULE_AREA::RefreshContainedItemsAndDirectives( SCH_SCREEN* screen )
                 }
             }
         }
+        else if( areaItem->IsType( { SCH_SHEET_T } ) )
+        {
+            const BOX2I      sheetBb = areaItem->GetBoundingBox();
+            const SHAPE_RECT rect( sheetBb );
+
+            if( GetPolyShape().Collide( &rect ) )
+            {
+                addContainedItem( areaItem );
+            }
+        }
     }
 }
 

qa/data/eeschema/netlists/hierarchical_component_classes/another_sheet.kicad_sch

@@ -0,0 +1,209 @@
+(kicad_sch
+	(version 20251012)
+	(generator "eeschema")
+	(generator_version "9.99")
+	(uuid "ea1f8edf-1e60-4f48-ba74-503c3b406cfc")
+	(paper "A4")
+	(lib_symbols
+		(symbol "Device:R"
+			(pin_numbers
+				(hide yes)
+			)
+			(pin_names
+				(offset 0)
+			)
+			(exclude_from_sim no)
+			(in_bom yes)
+			(on_board yes)
+			(duplicate_pin_numbers_are_jumpers no)
+			(property "Reference" "R"
+				(at 2.032 0 90)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+				)
+			)
+			(property "Value" "R"
+				(at 0 0 90)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+				)
+			)
+			(property "Footprint" ""
+				(at -1.778 0 90)
+				(hide yes)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+				)
+			)
+			(property "Datasheet" ""
+				(at 0 0 0)
+				(hide yes)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+				)
+			)
+			(property "Description" "Resistor"
+				(at 0 0 0)
+				(hide yes)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+				)
+			)
+			(property "ki_keywords" "R res resistor"
+				(at 0 0 0)
+				(hide yes)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+				)
+			)
+			(property "ki_fp_filters" "R_*"
+				(at 0 0 0)
+				(hide yes)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+				)
+			)
+			(symbol "R_0_1"
+				(rectangle
+					(start -1.016 -2.54)
+					(end 1.016 2.54)
+					(stroke
+						(width 0.254)
+						(type default)
+					)
+					(fill
+						(type none)
+					)
+				)
+			)
+			(symbol "R_1_1"
+				(pin passive line
+					(at 0 3.81 270)
+					(length 1.27)
+					(name ""
+						(effects
+							(font
+								(size 1.27 1.27)
+							)
+						)
+					)
+					(number "1"
+						(effects
+							(font
+								(size 1.27 1.27)
+							)
+						)
+					)
+				)
+				(pin passive line
+					(at 0 -3.81 90)
+					(length 1.27)
+					(name ""
+						(effects
+							(font
+								(size 1.27 1.27)
+							)
+						)
+					)
+					(number "2"
+						(effects
+							(font
+								(size 1.27 1.27)
+							)
+						)
+					)
+				)
+			)
+			(embedded_fonts no)
+		)
+	)
+	(symbol
+		(lib_id "Device:R")
+		(at 186.69 83.82 0)
+		(unit 1)
+		(body_style 1)
+		(exclude_from_sim no)
+		(in_bom yes)
+		(on_board yes)
+		(dnp no)
+		(fields_autoplaced yes)
+		(uuid "730bdc9b-2ca6-40b5-b487-73fa752f3460")
+		(property "Reference" "R5"
+			(at 189.23 82.5499 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+				(justify left)
+			)
+		)
+		(property "Value" "R"
+			(at 189.23 85.0899 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+				(justify left)
+			)
+		)
+		(property "Footprint" "Resistor_SMD:R_0603_1608Metric"
+			(at 184.912 83.82 90)
+			(hide yes)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+			)
+		)
+		(property "Datasheet" ""
+			(at 186.69 83.82 0)
+			(hide yes)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+			)
+		)
+		(property "Description" "Resistor"
+			(at 186.69 83.82 0)
+			(hide yes)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+			)
+		)
+		(pin "1"
+			(uuid "9ea6f0eb-f681-44ca-9401-3770eb115fb6")
+		)
+		(pin "2"
+			(uuid "02972978-fcea-4d0c-a5b1-2a0ddee61e91")
+		)
+		(instances
+			(project "sheets"
+				(path "/bde4f0aa-7cf7-4740-8df5-de6575c32a07/6e2d3d35-be93-4ad1-8bb1-3b2b72490946/8351e9a1-a2eb-4ba2-a99c-2f841ef19af3/72b63f92-8b9b-4056-b86f-2bd89069bb4f"
+					(reference "R6")
+					(unit 1)
+				)
+				(path "/bde4f0aa-7cf7-4740-8df5-de6575c32a07/aa6e1b5b-448e-4d6b-8c0f-36a7705eb7cb/8351e9a1-a2eb-4ba2-a99c-2f841ef19af3/72b63f92-8b9b-4056-b86f-2bd89069bb4f"
+					(reference "R5")
+					(unit 1)
+				)
+			)
+		)
+	)
+)

qa/data/eeschema/netlists/hierarchical_component_classes/hierarchical_component_classes.kicad_pro

@@ -0,0 +1,667 @@
+{
+  "board": {
+    "3dviewports": [],
+    "design_settings": {
+      "defaults": {
+        "apply_defaults_to_fp_barcodes": false,
+        "apply_defaults_to_fp_dimensions": false,
+        "apply_defaults_to_fp_fields": false,
+        "apply_defaults_to_fp_shapes": false,
+        "apply_defaults_to_fp_text": false,
+        "board_outline_line_width": 0.05,
+        "copper_line_width": 0.2,
+        "copper_text_italic": false,
+        "copper_text_size_h": 1.5,
+        "copper_text_size_v": 1.5,
+        "copper_text_thickness": 0.3,
+        "copper_text_upright": false,
+        "courtyard_line_width": 0.05,
+        "dimension_precision": 4,
+        "dimension_units": 3,
+        "dimensions": {
+          "arrow_length": 1270000,
+          "extension_offset": 500000,
+          "keep_text_aligned": true,
+          "suppress_zeroes": true,
+          "text_position": 0,
+          "units_format": 0
+        },
+        "fab_line_width": 0.1,
+        "fab_text_italic": false,
+        "fab_text_size_h": 1.0,
+        "fab_text_size_v": 1.0,
+        "fab_text_thickness": 0.15,
+        "fab_text_upright": false,
+        "other_line_width": 0.1,
+        "other_text_italic": false,
+        "other_text_size_h": 1.0,
+        "other_text_size_v": 1.0,
+        "other_text_thickness": 0.15,
+        "other_text_upright": false,
+        "pads": {
+          "drill": 0.8,
+          "height": 1.27,
+          "width": 2.54
+        },
+        "silk_line_width": 0.1,
+        "silk_text_italic": false,
+        "silk_text_size_h": 1.0,
+        "silk_text_size_v": 1.0,
+        "silk_text_thickness": 0.1,
+        "silk_text_upright": false,
+        "zones": {
+          "min_clearance": 0.5
+        }
+      },
+      "diff_pair_dimensions": [],
+      "drc_exclusions": [],
+      "meta": {
+        "version": 2
+      },
+      "rule_severities": {
+        "annular_width": "error",
+        "clearance": "error",
+        "connection_width": "warning",
+        "copper_edge_clearance": "error",
+        "copper_sliver": "warning",
+        "courtyards_overlap": "error",
+        "creepage": "error",
+        "diff_pair_gap_out_of_range": "error",
+        "diff_pair_uncoupled_length_too_long": "error",
+        "drill_out_of_range": "error",
+        "duplicate_footprints": "warning",
+        "extra_footprint": "warning",
+        "footprint": "error",
+        "footprint_filters_mismatch": "ignore",
+        "footprint_symbol_mismatch": "warning",
+        "footprint_type_mismatch": "ignore",
+        "hole_clearance": "error",
+        "hole_to_hole": "warning",
+        "holes_co_located": "warning",
+        "invalid_outline": "error",
+        "isolated_copper": "warning",
+        "item_on_disabled_layer": "error",
+        "items_not_allowed": "error",
+        "length_out_of_range": "error",
+        "lib_footprint_issues": "warning",
+        "lib_footprint_mismatch": "warning",
+        "malformed_courtyard": "error",
+        "microvia_drill_out_of_range": "error",
+        "mirrored_text_on_front_layer": "warning",
+        "missing_courtyard": "ignore",
+        "missing_footprint": "warning",
+        "missing_tuning_profile": "warning",
+        "net_conflict": "warning",
+        "nonmirrored_text_on_back_layer": "warning",
+        "npth_inside_courtyard": "ignore",
+        "padstack": "warning",
+        "pth_inside_courtyard": "ignore",
+        "shorting_items": "error",
+        "silk_edge_clearance": "warning",
+        "silk_over_copper": "warning",
+        "silk_overlap": "warning",
+        "skew_out_of_range": "error",
+        "solder_mask_bridge": "error",
+        "starved_thermal": "error",
+        "text_height": "warning",
+        "text_on_edge_cuts": "error",
+        "text_thickness": "warning",
+        "through_hole_pad_without_hole": "error",
+        "too_many_vias": "error",
+        "track_angle": "error",
+        "track_dangling": "warning",
+        "track_segment_length": "error",
+        "track_width": "error",
+        "tracks_crossing": "error",
+        "unconnected_items": "error",
+        "unresolved_variable": "error",
+        "via_dangling": "warning",
+        "zones_intersect": "error"
+      },
+      "rules": {
+        "max_error": 0.005,
+        "min_clearance": 0.0,
+        "min_connection": 0.0,
+        "min_copper_edge_clearance": 0.5,
+        "min_groove_width": 0.0,
+        "min_hole_clearance": 0.25,
+        "min_hole_to_hole": 0.25,
+        "min_microvia_diameter": 0.2,
+        "min_microvia_drill": 0.1,
+        "min_resolved_spokes": 2,
+        "min_silk_clearance": 0.0,
+        "min_text_height": 0.8,
+        "min_text_thickness": 0.08,
+        "min_through_hole_diameter": 0.3,
+        "min_track_width": 0.0,
+        "min_via_annular_width": 0.1,
+        "min_via_diameter": 0.5,
+        "solder_mask_to_copper_clearance": 0.0,
+        "use_height_for_length_calcs": true
+      },
+      "teardrop_options": [
+        {
+          "td_onpthpad": true,
+          "td_onroundshapesonly": false,
+          "td_onsmdpad": true,
+          "td_ontrackend": false,
+          "td_onvia": true
+        }
+      ],
+      "teardrop_parameters": [
+        {
+          "td_allow_use_two_tracks": true,
+          "td_curve_segcount": 0,
+          "td_height_ratio": 1.0,
+          "td_length_ratio": 0.5,
+          "td_maxheight": 2.0,
+          "td_maxlen": 1.0,
+          "td_on_pad_in_zone": false,
+          "td_target_name": "td_round_shape",
+          "td_width_to_size_filter_ratio": 0.9
+        },
+        {
+          "td_allow_use_two_tracks": true,
+          "td_curve_segcount": 0,
+          "td_height_ratio": 1.0,
+          "td_length_ratio": 0.5,
+          "td_maxheight": 2.0,
+          "td_maxlen": 1.0,
+          "td_on_pad_in_zone": false,
+          "td_target_name": "td_rect_shape",
+          "td_width_to_size_filter_ratio": 0.9
+        },
+        {
+          "td_allow_use_two_tracks": true,
+          "td_curve_segcount": 0,
+          "td_height_ratio": 1.0,
+          "td_length_ratio": 0.5,
+          "td_maxheight": 2.0,
+          "td_maxlen": 1.0,
+          "td_on_pad_in_zone": false,
+          "td_target_name": "td_track_end",
+          "td_width_to_size_filter_ratio": 0.9
+        }
+      ],
+      "track_widths": [],
+      "tuning_pattern_settings": {
+        "diff_pair_defaults": {
+          "corner_radius_percentage": 80,
+          "corner_style": 1,
+          "max_amplitude": 1.0,
+          "min_amplitude": 0.2,
+          "single_sided": false,
+          "spacing": 1.0
+        },
+        "diff_pair_skew_defaults": {
+          "corner_radius_percentage": 80,
+          "corner_style": 1,
+          "max_amplitude": 1.0,
+          "min_amplitude": 0.2,
+          "single_sided": false,
+          "spacing": 0.6
+        },
+        "single_track_defaults": {
+          "corner_radius_percentage": 80,
+          "corner_style": 1,
+          "max_amplitude": 1.0,
+          "min_amplitude": 0.2,
+          "single_sided": false,
+          "spacing": 0.6
+        }
+      },
+      "via_dimensions": [],
+      "zones_allow_external_fillets": false
+    },
+    "ipc2581": {
+      "dist": "",
+      "distpn": "",
+      "internal_id": "",
+      "mfg": "",
+      "mpn": ""
+    },
+    "layer_pairs": [],
+    "layer_presets": [],
+    "viewports": []
+  },
+  "boards": [],
+  "component_class_settings": {
+    "assignments": [],
+    "meta": {
+      "version": 0
+    },
+    "sheet_component_classes": {
+      "enabled": false
+    }
+  },
+  "cvpcb": {
+    "equivalence_files": []
+  },
+  "erc": {
+    "erc_exclusions": [],
+    "meta": {
+      "version": 0
+    },
+    "pin_map": [
+      [
+        0,
+        0,
+        0,
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+}

qa/data/eeschema/netlists/hierarchical_component_classes/hierarchical_component_classes.kicad_sch

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+		)
+		(instances
+			(project "sheets"
+				(path "/bde4f0aa-7cf7-4740-8df5-de6575c32a07"
+					(page "3")
+				)
+			)
+		)
+	)
+	(sheet_instances
+		(path "/"
+			(page "1")
+		)
+	)
+	(embedded_fonts no)
+)

qa/data/eeschema/netlists/hierarchical_component_classes/sheet_3.kicad_sch

@@ -0,0 +1,251 @@
+(kicad_sch
+	(version 20251012)
+	(generator "eeschema")
+	(generator_version "9.99")
+	(uuid "375bbda3-09dc-4a5d-a2f3-892747f29935")
+	(paper "A4")
+	(lib_symbols
+		(symbol "Device:R"
+			(pin_numbers
+				(hide yes)
+			)
+			(pin_names
+				(offset 0)
+			)
+			(exclude_from_sim no)
+			(in_bom yes)
+			(on_board yes)
+			(duplicate_pin_numbers_are_jumpers no)
+			(property "Reference" "R"
+				(at 2.032 0 90)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+				)
+			)
+			(property "Value" "R"
+				(at 0 0 90)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+				)
+			)
+			(property "Footprint" ""
+				(at -1.778 0 90)
+				(hide yes)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+				)
+			)
+			(property "Datasheet" ""
+				(at 0 0 0)
+				(hide yes)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+				)
+			)
+			(property "Description" "Resistor"
+				(at 0 0 0)
+				(hide yes)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+				)
+			)
+			(property "ki_keywords" "R res resistor"
+				(at 0 0 0)
+				(hide yes)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+				)
+			)
+			(property "ki_fp_filters" "R_*"
+				(at 0 0 0)
+				(hide yes)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+				)
+			)
+			(symbol "R_0_1"
+				(rectangle
+					(start -1.016 -2.54)
+					(end 1.016 2.54)
+					(stroke
+						(width 0.254)
+						(type default)
+					)
+					(fill
+						(type none)
+					)
+				)
+			)
+			(symbol "R_1_1"
+				(pin passive line
+					(at 0 3.81 270)
+					(length 1.27)
+					(name ""
+						(effects
+							(font
+								(size 1.27 1.27)
+							)
+						)
+					)
+					(number "1"
+						(effects
+							(font
+								(size 1.27 1.27)
+							)
+						)
+					)
+				)
+				(pin passive line
+					(at 0 -3.81 90)
+					(length 1.27)
+					(name ""
+						(effects
+							(font
+								(size 1.27 1.27)
+							)
+						)
+					)
+					(number "2"
+						(effects
+							(font
+								(size 1.27 1.27)
+							)
+						)
+					)
+				)
+			)
+			(embedded_fonts no)
+		)
+	)
+	(symbol
+		(lib_id "Device:R")
+		(at 144.78 96.52 0)
+		(unit 1)
+		(body_style 1)
+		(exclude_from_sim no)
+		(in_bom yes)
+		(on_board yes)
+		(dnp no)
+		(fields_autoplaced yes)
+		(uuid "6312dea8-7205-4212-8c2b-93068c7fc869")
+		(property "Reference" "R3"
+			(at 147.32 95.2499 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+				(justify left)
+			)
+		)
+		(property "Value" "R"
+			(at 147.32 97.7899 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+				(justify left)
+			)
+		)
+		(property "Footprint" "Resistor_SMD:R_0603_1608Metric"
+			(at 143.002 96.52 90)
+			(hide yes)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+			)
+		)
+		(property "Datasheet" ""
+			(at 144.78 96.52 0)
+			(hide yes)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+			)
+		)
+		(property "Description" "Resistor"
+			(at 144.78 96.52 0)
+			(hide yes)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+			)
+		)
+		(pin "1"
+			(uuid "1d14e643-4ed3-4201-875a-17e42e0b1a56")
+		)
+		(pin "2"
+			(uuid "6679c4ad-4e66-43c3-929c-48a91f4bbe5c")
+		)
+		(instances
+			(project "sheets"
+				(path "/bde4f0aa-7cf7-4740-8df5-de6575c32a07/6e2d3d35-be93-4ad1-8bb1-3b2b72490946/8351e9a1-a2eb-4ba2-a99c-2f841ef19af3"
+					(reference "R3")
+					(unit 1)
+				)
+				(path "/bde4f0aa-7cf7-4740-8df5-de6575c32a07/aa6e1b5b-448e-4d6b-8c0f-36a7705eb7cb/8351e9a1-a2eb-4ba2-a99c-2f841ef19af3"
+					(reference "R4")
+					(unit 1)
+				)
+			)
+		)
+	)
+	(sheet
+		(at 186.69 68.58)
+		(size 46.99 29.21)
+		(exclude_from_sim no)
+		(in_bom yes)
+		(on_board yes)
+		(dnp no)
+		(fields_autoplaced yes)
+		(stroke
+			(width 0.1524)
+			(type solid)
+		)
+		(fill
+			(color 0 0 0 0)
+		)
+		(uuid "72b63f92-8b9b-4056-b86f-2bd89069bb4f")
+		(property "Sheetname" "Another_Sheet"
+			(at 186.69 67.8684 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+				(justify left bottom)
+			)
+		)
+		(property "Sheetfile" "another_sheet.kicad_sch"
+			(at 186.69 98.3746 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+				(justify left top)
+			)
+		)
+		(instances
+			(project ""
+				(path "/bde4f0aa-7cf7-4740-8df5-de6575c32a07/aa6e1b5b-448e-4d6b-8c0f-36a7705eb7cb/8351e9a1-a2eb-4ba2-a99c-2f841ef19af3"
+					(page "5")
+				)
+			)
+		)
+	)
+)

qa/data/eeschema/netlists/hierarchical_component_classes/subsheet_1.kicad_sch

@@ -0,0 +1,301 @@
+(kicad_sch
+	(version 20251012)
+	(generator "eeschema")
+	(generator_version "9.99")
+	(uuid "5c18b1c3-5d06-483c-bce6-927ba4859ed2")
+	(paper "A4")
+	(lib_symbols
+		(symbol "Device:R"
+			(pin_numbers
+				(hide yes)
+			)
+			(pin_names
+				(offset 0)
+			)
+			(exclude_from_sim no)
+			(in_bom yes)
+			(on_board yes)
+			(duplicate_pin_numbers_are_jumpers no)
+			(property "Reference" "R"
+				(at 2.032 0 90)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+				)
+			)
+			(property "Value" "R"
+				(at 0 0 90)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+				)
+			)
+			(property "Footprint" ""
+				(at -1.778 0 90)
+				(hide yes)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+				)
+			)
+			(property "Datasheet" ""
+				(at 0 0 0)
+				(hide yes)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+				)
+			)
+			(property "Description" "Resistor"
+				(at 0 0 0)
+				(hide yes)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+				)
+			)
+			(property "ki_keywords" "R res resistor"
+				(at 0 0 0)
+				(hide yes)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+				)
+			)
+			(property "ki_fp_filters" "R_*"
+				(at 0 0 0)
+				(hide yes)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+				)
+			)
+			(symbol "R_0_1"
+				(rectangle
+					(start -1.016 -2.54)
+					(end 1.016 2.54)
+					(stroke
+						(width 0.254)
+						(type default)
+					)
+					(fill
+						(type none)
+					)
+				)
+			)
+			(symbol "R_1_1"
+				(pin passive line
+					(at 0 3.81 270)
+					(length 1.27)
+					(name ""
+						(effects
+							(font
+								(size 1.27 1.27)
+							)
+						)
+					)
+					(number "1"
+						(effects
+							(font
+								(size 1.27 1.27)
+							)
+						)
+					)
+				)
+				(pin passive line
+					(at 0 -3.81 90)
+					(length 1.27)
+					(name ""
+						(effects
+							(font
+								(size 1.27 1.27)
+							)
+						)
+					)
+					(number "2"
+						(effects
+							(font
+								(size 1.27 1.27)
+							)
+						)
+					)
+				)
+			)
+			(embedded_fonts no)
+		)
+	)
+	(rule_area
+		(exclude_from_sim no)
+		(in_bom yes)
+		(on_board yes)
+		(dnp no)
+		(polyline
+			(pts
+				(xy 127 34.29) (xy 195.58 34.29) (xy 195.58 91.44) (xy 127 91.44)
+			)
+			(stroke
+				(width 0)
+				(type dash)
+			)
+			(fill
+				(type none)
+			)
+			(uuid "5aefaf21-deec-4e8f-ab94-eb402769206f")
+		)
+	)
+	(netclass_flag ""
+		(length 2.54)
+		(shape round)
+		(at 135.89 34.29 0)
+		(fields_autoplaced yes)
+		(effects
+			(font
+				(size 1.27 1.27)
+			)
+			(justify left bottom)
+		)
+		(uuid "42e2089b-d7e9-4bb7-a7c5-835f9ed55531")
+		(property "Net Class" ""
+			(at -142.24 13.97 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+			)
+		)
+		(property "Component Class" "CLASS_3"
+			(at 136.5885 31.75 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+					(italic yes)
+				)
+				(justify left)
+			)
+		)
+	)
+	(symbol
+		(lib_id "Device:R")
+		(at 97.79 52.07 0)
+		(unit 1)
+		(body_style 1)
+		(exclude_from_sim no)
+		(in_bom yes)
+		(on_board yes)
+		(dnp no)
+		(fields_autoplaced yes)
+		(uuid "bf318324-2825-47aa-971c-27177a46b6a1")
+		(property "Reference" "R1"
+			(at 100.33 50.7999 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+				(justify left)
+			)
+		)
+		(property "Value" "R"
+			(at 100.33 53.3399 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+				(justify left)
+			)
+		)
+		(property "Footprint" "Resistor_SMD:R_0603_1608Metric"
+			(at 96.012 52.07 90)
+			(hide yes)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+			)
+		)
+		(property "Datasheet" ""
+			(at 97.79 52.07 0)
+			(hide yes)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+			)
+		)
+		(property "Description" "Resistor"
+			(at 97.79 52.07 0)
+			(hide yes)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+			)
+		)
+		(pin "1"
+			(uuid "6de42da5-7876-4c7a-a7b4-ac09e428b309")
+		)
+		(pin "2"
+			(uuid "b31a9981-4f66-4713-8f9c-5cbc94630d0e")
+		)
+		(instances
+			(project ""
+				(path "/bde4f0aa-7cf7-4740-8df5-de6575c32a07/6e2d3d35-be93-4ad1-8bb1-3b2b72490946"
+					(reference "R1")
+					(unit 1)
+				)
+				(path "/bde4f0aa-7cf7-4740-8df5-de6575c32a07/aa6e1b5b-448e-4d6b-8c0f-36a7705eb7cb"
+					(reference "R2")
+					(unit 1)
+				)
+			)
+		)
+	)
+	(sheet
+		(at 134.62 43.18)
+		(size 52.07 34.29)
+		(exclude_from_sim no)
+		(in_bom yes)
+		(on_board yes)
+		(dnp no)
+		(fields_autoplaced yes)
+		(stroke
+			(width 0.1524)
+			(type solid)
+		)
+		(fill
+			(color 0 0 0 0)
+		)
+		(uuid "8351e9a1-a2eb-4ba2-a99c-2f841ef19af3")
+		(property "Sheetname" "SHEET_3"
+			(at 134.62 42.4684 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+				(justify left bottom)
+			)
+		)
+		(property "Sheetfile" "sheet_3.kicad_sch"
+			(at 134.62 78.0546 0)
+			(effects
+				(font
+					(size 1.27 1.27)
+				)
+				(justify left top)
+			)
+		)
+		(instances
+			(project ""
+				(path "/bde4f0aa-7cf7-4740-8df5-de6575c32a07/6e2d3d35-be93-4ad1-8bb1-3b2b72490946"
+					(page "4")
+				)
+			)
+		)
+	)
+)

qa/tests/eeschema/test_netlist_exporter_kicad.cpp

@@ -90,7 +90,7 @@ public:
                 BOOST_REQUIRE_EQUAL( goldenNet.GetPinType(), testNet.GetPinType() );
             }
 
-            // And the the resolved component class is the same
+            // And the resolved component class is the same
             BOOST_REQUIRE( goldenComp->GetComponentClassNames()
                            == refComp->GetComponentClassNames() );
         }
@@ -220,6 +220,11 @@ BOOST_AUTO_TEST_CASE( ComponentClasses )
     TestNetlist( "component_classes" );
 }
 
+BOOST_AUTO_TEST_CASE( HierarchicalComponentClasses )
+{
+    TestNetlist( "hierarchical_component_classes" );
+}
+
 
 BOOST_AUTO_TEST_CASE( Jumpers )
 {