Make tlvmeta recognize feature map bitmaps. (#28084)

* Make tlvmeta recognize feature map bitmaps.

zap does not support per cluster featuremap types because types
are global, however we can use naming conventions to select
the correct featuremap values.

This makes decoded data more user friendly.

* Make flake8 happy

* Support "Feature" as a name for features

* Fix unit tests

---------

Co-authored-by: Andrei Litvin <andreilitvin@google.com>

scripts/py_matter_idl/matter_idl/generators/cpp/tlvmeta/__init__.py

@@ -62,14 +62,16 @@ def __init__(self, cluster: Cluster):
         for b in self.cluster.bitmaps:
             self.item_type_map[b.name] = "kBitmap"
 
-    def FieldEntry(self, field: Field, tag_type: str = 'ContextTag') -> TableEntry:
-        type_reference = "%s_%s" % (self.cluster.name, field.data_type.name)
+    def FieldEntry(self, field: Field, tag_type: str = 'ContextTag', type_override: Optional[str] = None) -> TableEntry:
+        data_type_name = type_override or field.data_type.name
+        type_reference = "%s_%s" % (self.cluster.name, data_type_name)
+
         if type_reference not in self.known_types:
             type_reference = None
 
-        item_type = self.item_type_map.get(field.data_type.name, 'kDefault')
+        item_type = self.item_type_map.get(data_type_name, 'kDefault')
 
-        real_type = "%s::%s" % (self.cluster.name, field.data_type.name)
+        real_type = "%s::%s" % (self.cluster.name, data_type_name)
         if field.is_list:
             real_type = real_type + "[]"
             item_type = "kList"
@@ -142,11 +144,21 @@ def CommandEntries(self) -> Generator[TableEntry, None, None]:
     def GenerateTables(self) -> Generator[Table, None, None]:
         self.ComputeKnownTypes()
 
+        cluster_feature_map = None
+        for b in self.cluster.bitmaps:
+            # Older matter files use `ClusterNameFeature` as naming, newer code was
+            # updated to just `Feature`. For now support both.
+            if b.name in {'Feature', f'{self.cluster.name}Feature'} and b.base_type.lower() == 'bitmap32':
+                cluster_feature_map = b.name
+
         # Clusters have attributes. They are direct descendants for
         # attributes
         cluster_entries = []
-        cluster_entries.extend([self.FieldEntry(
-            a.definition, tag_type='AttributeTag') for a in self.cluster.attributes])
+        cluster_entries.extend([
+            self.FieldEntry(a.definition, tag_type='AttributeTag',
+                            type_override=(cluster_feature_map if a.definition.code == 0xFFFC else None))
+            for a in self.cluster.attributes
+        ])
 
         cluster_entries.extend([
             # events always reference an existing struct

scripts/py_matter_idl/matter_idl/tests/outputs/cluster_with_commands/cpp-tlvmeta/clusters_meta.cpp

@@ -9,7 +9,7 @@ using namespace chip::TLV;
 
 const Entry<ItemInfo> _OnOff[] = {
   { { AttributeTag(0), "onOff", ItemType::kDefault }, kInvalidNodeIndex }, // OnOff::boolean
-  { { AttributeTag(65532), "featureMap", ItemType::kDefault }, kInvalidNodeIndex }, // OnOff::bitmap32
+  { { AttributeTag(65532), "featureMap", ItemType::kBitmap }, 8 }, // OnOff::OnOffFeature
   { { AttributeTag(65533), "clusterRevision", ItemType::kDefault }, kInvalidNodeIndex }, // OnOff::int16u
   { { CommandTag(0), "Off", ItemType::kDefault }, kInvalidNodeIndex }, // OnOff::Off::()
   { { CommandTag(1), "On", ItemType::kDefault }, kInvalidNodeIndex }, // OnOff::On::()

src/lib/format/tests/TestDecoding.cpp

@@ -274,7 +274,7 @@ void TestFullDataDecoding(nlTestSuite * inSuite, void * inContext)
                    "          endpoint_id: 0\n"
                    "          cluster_id: 49 == 'NetworkCommissioning'\n"
                    "          attribute_id: 65532 == 'featureMap'\n"
-                   "        NetworkCommissioning::featureMap: 4\n"
+                   "        NetworkCommissioning::featureMap: 4 == kEthernetNetworkInterface\n"
                    "  suppress_response: true\n"
                    "  interaction_model_revison: 1\n");