Add a Properties view for the app root

The root tree row now names the app component, "app (<host:port>)" or
"app (<file>)", and offers Properties from its context menu and on
double-click. The live DOM's <app> element now carries its type and slot
values, and the refresh-by-id lookup finds it, so the view shows real
sys::App values.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app_state.py

@@ -8,7 +8,7 @@ so later rebinding would only ever be seen by the module that did it.
 import configparser
 import os
 
-VERSION = "0.0.0.133"
+VERSION = "0.0.0.135"
 PROPERTIES_FILE = os.path.join(os.path.dirname(os.path.abspath(__file__)), "editor.properties")
 DEFAULT_GRID_SIZE = 10
 DEFAULT_ADD_TIMESTAMP = True

device_session.py

@@ -45,6 +45,7 @@ class DeviceSession:
         """DASP connect → read schema → load root. Called from background thread."""
         self.sox_client = SoxClient(host, int(port), user, password)
         self.sox_client.on_event = self._on_sox_event
+        self.sox_client.checksum_resolver = schema.resolve_truncated_checksum
         self.sox_client.connect()
 
         parts = self.sox_client.read_schema()
@@ -299,6 +300,10 @@ class DeviceSession:
         app_elem = ET.SubElement(sax_root, "app")
         if root_comp is not None:
             app_elem.set("id", str(root_comp.id))
+            # The app is a component like any other, so the Properties view needs its
+            # type and slot values too. A .sax file leaves both implied; here they are not.
+            app_elem.set("type", root_comp.type_name)
+            self._add_prop_elements(app_elem, root_comp)
             for child_id in root_comp.children:
                 child_comp = self.sox_client.cache_get(child_id)
                 if child_comp is not None:
@@ -317,22 +322,7 @@ class DeviceSession:
             "type": type_qname,
         }
         comp_elem = ET.SubElement(parent_elem, "comp", **attribs)
-
-        slots = self.sox_client.slot_registry.get(
-            (sox_comp.kit_id, sox_comp.type_id))
-        if slots:
-            for slot in slots:
-                if slot.get("is_action"):
-                    continue
-                name = slot["name"]
-                if name in sox_comp.values:
-                    val = sox_comp.values[name]
-                    if isinstance(val, float):
-                        val_str = _fmt_float(val, _slot_precision(type_qname, name))
-                    else:
-                        val_str = str(val)
-                    ET.SubElement(comp_elem, "prop",
-                                  name=name, val=val_str)
+        self._add_prop_elements(comp_elem, sox_comp)
 
         for child_id in sox_comp.children:
             child_comp = self.sox_client.cache_get(child_id)
@@ -345,6 +335,24 @@ class DeviceSession:
 
         return comp_elem
 
+    def _add_prop_elements(self, comp_elem, sox_comp):
+        """Writes a <prop> for every cached non-action slot value of `sox_comp`."""
+        slots = self.sox_client.slot_registry.get(
+            (sox_comp.kit_id, sox_comp.type_id))
+        if not slots:
+            return
+        for slot in slots:
+            if slot.get("is_action"):
+                continue
+            name = slot["name"]
+            if name in sox_comp.values:
+                val = sox_comp.values[name]
+                if isinstance(val, float):
+                    val_str = _fmt_float(val, _slot_precision(sox_comp.type_name, name))
+                else:
+                    val_str = str(val)
+                ET.SubElement(comp_elem, "prop", name=name, val=val_str)
+
     def build_links_elements(self, sax_root):
         """Adds <link> elements under a <links> container, matching .sax structure."""
         links_elem = sax_root.find("links")
@@ -448,6 +456,9 @@ class DeviceSession:
     @staticmethod
     def _find_element_by_id(root, comp_id):
         target = str(comp_id)
+        app_elem = root.find("app")
+        if app_elem is not None and app_elem.get("id") == target:
+            return app_elem
         for elem in root.iter("comp"):
             if elem.get("id") == target:
                 return elem

main.py

@@ -293,7 +293,8 @@ def show_properties(comp):
     )
     properties_panel.frame.pack(fill=tk.BOTH, expand=True)
     record_visit(VIEW_PROPERTIES, comp)
-    app_state.set_status(f"Properties: {comp.get('name', '?')}")
+    default_name = "App" if comp.tag == "app" else "?"
+    app_state.set_status(f"Properties: {comp.get('name', default_name)}")
 
 
 def dismiss_properties(restore_canvas=True):
@@ -1064,6 +1065,12 @@ def on_tree_right_click(event):
 
     if parent_id == "":
         tree_root_context_menu.delete(0, tk.END)
+        # The root row names the <app> itself, which has slots of its own to show.
+        app_element = app_state.tree_element_map.get(item_id)
+        if app_element is not None:
+            tree_root_context_menu.add_command(
+                label="Properties", command=lambda: show_properties(app_element))
+            tree_root_context_menu.add_separator()
         if app_state.live_mode and app_state.device_session and app_state.device_session.is_connected:
             for action_name in _APP_ACTIONS:
                 tree_root_context_menu.add_command(
@@ -1100,10 +1107,14 @@ def on_tree_double_click(event):
     """Double-click on a tree node opens its special view (or Properties)."""
     tree = app_state.tree
     item_id = tree.identify_row(event.y)
-    if not item_id or tree.parent(item_id) == "":
+    if not item_id:
         return
     comp = app_state.tree_element_map.get(item_id)
-    if comp is not None:
+    if comp is None:
+        return
+    if tree.parent(item_id) == "":
+        show_properties(comp)
+    else:
         _open_special_view(comp)
 
 

properties.py

@@ -508,7 +508,9 @@ class PropertiesPanel:
         # the view would open already claiming unsaved edits.
         self._loading = False
 
-        comp_type = comp.get("type", "sys::Component")
+        # A .sax file's <app> carries no type attribute: it is always a sys::App.
+        default_type = "sys::App" if comp.tag == "app" else "sys::Component"
+        comp_type = comp.get("type") or default_type
         self.slots = schema.get_full_slots_for_type(comp_type)
 
         self.frame = tk.Frame(parent)
@@ -624,7 +626,8 @@ class PropertiesPanel:
         name_font = tkfont.Font(family="Segoe UI", size=9, weight="bold")
         type_font = tkfont.Font(family="Segoe UI", size=9)
 
-        self._tinted(tk.Label(header, text=self.comp.get("name", "?"), font=name_font,
+        default_name = "App" if self.comp.tag == "app" else "?"
+        self._tinted(tk.Label(header, text=self.comp.get("name", default_name), font=name_font,
                               bg=HEADER_BG), HEADER_BG).pack(side=tk.LEFT)
         self._tinted(tk.Label(header, text=f"({comp_type})", font=type_font,
                               fg="#555555", bg=HEADER_BG),

sax_file.py

@@ -64,12 +64,13 @@ def refresh_treeview_from_dom(xml_root):
         return
 
     if app_state.live_mode:
-        file_name = f"{app_state.device_host}:{app_state.device_port}"
+        source = f"{app_state.device_host}:{app_state.device_port}"
     else:
-        file_name = os.path.basename(app_state.current_file_path)
+        source = os.path.basename(app_state.current_file_path)
+    # The row is the <app> component itself; where it came from goes in brackets.
     # Inserted plain. refresh_dirty_display puts the unsaved tag on or off, and runs
     # after every rebuild, so a fresh row picks up the right state there.
-    root_node = tree.insert("", "end", text=file_name, open=True)
+    root_node = tree.insert("", "end", text=f"app ({source})", open=True)
 
     app_element = xml_root.find("app")
     if app_element is not None:

schema.py

@@ -224,9 +224,32 @@ def find_manifest_path(kit_name, checksum):
     return None
 
 
+def resolve_truncated_checksum(kit_name, prefix):
+    """The checksum of the one local manifest whose leading bytes match ``prefix``.
+
+    Used when a device's schema reply cut a kit's checksum short. Returns the
+    checksum as a signed 32-bit int (as read off the wire), or None when no
+    manifest, or more than one, matches.
+    """
+    manifest_dir = os.path.join(app_state.SEDONA_HOME, "manifests", kit_name)
+    if not os.path.isdir(manifest_dir):
+        return None
+    want = prefix.hex()
+    matches = set()
+    for f in os.listdir(manifest_dir):
+        if f.startswith(f"{kit_name}-") and f.endswith(".xml"):
+            hex_part = f[len(kit_name) + 1:-4].zfill(8).lower()
+            if hex_part.startswith(want):
+                matches.add(hex_part)
+    if len(matches) != 1:
+        return None
+    value = int(matches.pop(), 16)
+    return value - (1 << 32) if value & 0x80000000 else value
+
+
 def find_manifest(kit_name, checksum):
     """Returns the parsed ET root of a kit manifest, or None."""
-    checksum_hex = f"{checksum:08x}" if isinstance(checksum, int) else checksum
+    checksum_hex = f"{checksum & 0xFFFFFFFF:08x}" if isinstance(checksum, int) else checksum
     path = find_manifest_path(kit_name, checksum_hex)
     if path is None:
         return None

sox.py

@@ -95,6 +95,13 @@ class SoxMsg:
         self._pos += 1  # null terminator
         return s
 
+    def try_str(self):
+        """Like str(), but returns None instead of overrunning a truncated buffer."""
+        end = self._buf.find(0, self._pos, self._size)
+        if end < 0:
+            return None
+        return self.str()
+
     def read_bytes(self, n):
         data = bytes(self._buf[self._pos:self._pos + n])
         self._pos += n
@@ -363,6 +370,10 @@ class SoxClient:
         # each slot dict: {name, id, type_name, is_config, is_runtime, is_action, is_operator, is_as_str}
         self.slot_registry = {}
 
+        # fn(kit_name, prefix_bytes) -> signed i4 checksum or None; recovers a
+        # checksum the device's reply truncated. Set externally by device_session.
+        self.checksum_resolver = None
+
         # type name map — set externally by device_session
         # maps (kit_id, type_id) -> "kit::TypeName" for proper type resolution
         self.type_name_map = {}
@@ -413,10 +424,28 @@ class SoxClient:
         res.check_response('V')
         num = res.u1()
         parts = []
+        # The device builds this reply in a fixed 512-byte packet and silently
+        # drops whatever does not fit, so a device with many kits can cut the
+        # list short — sometimes mid-checksum of the last kit.
         for _ in range(num):
-            name = res.str()
-            checksum = res.i4()
+            name = res.try_str()
+            if name is None:
+                break
+            if res.remaining >= 4:
+                checksum = res.i4()
+            else:
+                prefix = res.read_bytes(res.remaining)
+                checksum = (self.checksum_resolver(name, prefix)
+                            if self.checksum_resolver else None)
+                if checksum is None:
+                    break
             parts.append(KitPart(name, checksum))
+        if len(parts) < num:
+            raise SoxException(
+                f"The device lists {num} kits but its reply was cut off after "
+                f"{len(parts)} — the list does not fit in the device's 512-byte "
+                f"Sox packet. Remove unused kits from the device's scode, or "
+                f"shorten kit names.")
         self.schema_parts = parts
         return parts
 
@@ -427,17 +456,21 @@ class SoxClient:
         req = _prepare_request(ord('y'))
         res = self.request(req)
         res.check_response('Y')
-        platform_id = res.str()
-        scode_flags = res.u1()
+        # Same 512-byte limit as read_schema: whatever is cut off is left
+        # blank rather than failing the connect.
+        platform_id = res.try_str() or ""
+        scode_flags = res.u1() if res.remaining > 0 else 0
         kit_versions = []
         for p in parts:
-            ver = res.str()
-            kit_versions.append((p.name, p.checksum, ver))
+            ver = res.try_str()
+            kit_versions.append((p.name, p.checksum, ver or ""))
         vi = VersionInfo(platform_id, scode_flags, kit_versions)
-        prop_num = res.u1()
+        prop_num = res.u1() if res.remaining > 0 else 0
         for _ in range(prop_num):
-            k = res.str()
-            v = res.str()
+            k = res.try_str()
+            v = res.try_str()
+            if k is None or v is None:
+                break
             vi.props[k] = v
         self.version_info = vi
         return vi