feat(lsp): warn on undeclared block templates and addresses

Add diagnostics that warn when a literal NX command argument names a block
template or address that no loaded .def file declares (diagnostic codes
unknown-block-template and unknown-address). Names computed at runtime
(e.g. $var or "CYCLE_$x") are not checked, and kinds whose .def file is
not loaded are skipped.

The server now recomputes and refreshes diagnostics when .def documents
change (clears cached diagnostics and requests a workspace diagnostic
refresh if the client supports it). Tests cover positive, negative and
invalidated-cache cases.

server/src/lsp_tclserver.py

@@ -18,7 +18,7 @@ from tools import checks, incremental_parse, parser
 from tools.completion_items import CompletionCollector
 from tools.tcloo_symbols import class_completion_items
 from tools.tcloo_completion import indexed_classes
-from tools.def_flow import WrapperTable, build_wrapper_table
+from tools.def_flow import WrapperTable, build_wrapper_table, unknown_def_names
 from tools.def_symbols import ADDRESS, BLOCK_TEMPLATE, DefDocument, parse_def_document, read_def_source
 from tools.file_sourcing import get_all_psc_files, psc_defined_event_files, psc_script_files
 from tools.formatter import NxFormatter as Formatter
@@ -276,7 +276,20 @@ class TclLanguageServer(LanguageServer):
                     except OSError as error:
                         report(f"Could not read DEF file {def_file}: {error}")
         with self._index_lock:
+            changed = documents != self.def_documents
             self.def_documents = documents
+            if changed:
+                # Unknown template/address warnings depend on the .def files.
+                self.diagnostics.clear()
+        if changed:
+            self._request_diagnostic_refresh()
+
+    def _request_diagnostic_refresh(self) -> None:
+        # Set by the initialize request; absent before it and in tests.
+        capabilities = getattr(self.protocol, "client_capabilities", None)
+        diagnostics = getattr(getattr(capabilities, "workspace", None), "diagnostics", None)
+        if getattr(diagnostics, "refresh_support", False):
+            self.workspace_diagnostic_refresh(None)
 
     def def_documents_snapshot(self, current_path=None, current_source: str | None = None) -> dict[str, DefDocument]:
         """Return the PSC .def documents; ``current_source`` replaces the file being edited."""
@@ -898,8 +911,27 @@ class TclLanguageServer(LanguageServer):
                 )
             )
 
+        diagnostics.extend(self._def_diagnostics(document))
         return diagnostics
 
+    def _def_diagnostics(self, document: TextDocument) -> List[lsp.Diagnostic]:
+        documents = self.def_documents_snapshot()
+        declared = {
+            kind: frozenset(name for def_document in documents.values() for name in def_document.names(kind))
+            for kind in (BLOCK_TEMPLATE, ADDRESS)
+        }
+        labels = {BLOCK_TEMPLATE: "Block template", ADDRESS: "Address"}
+        return [
+            lsp.Diagnostic(
+                message=f"{labels[kind]} '{name}' is not declared in any loaded .def file",
+                severity=lsp.DiagnosticSeverity.Warning,
+                range=range_,
+                code=f"unknown-{kind.replace('_', '-')}",
+                source=DIAGNOSTIC_SOURCE,
+            )
+            for kind, name, range_ in unknown_def_names(self.get_tree(document), declared)
+        ]
+
     def _compute_diagnostics(self, document: TextDocument) -> List[lsp.Diagnostic]:
         return self.lint(document)
 

server/src/tools/def_flow.py

@@ -338,3 +338,27 @@ def derived_def_symbol(
         targets.extend(target for variable in variables for target in scope_targets.get(variable, ()))
     kinds = frozenset(kind for target in targets for kind in _target_kinds(target, table, namespace))
     return (kinds, *literal) if kinds else None
+
+
+def _all_commands(node: Node) -> Iterator[Command]:
+    for child in getattr(node, "children", []):
+        if isinstance(child, Command):
+            yield child
+        yield from _all_commands(child)
+
+
+def unknown_def_names(tree: Node, declared: dict[str, frozenset[str]]) -> list[tuple[str, str, lsp.Range]]:
+    """Literal NX command arguments naming a block template or address no .def file declares.
+
+    ``declared`` maps each kind to its declared names; kinds without any
+    declaration are not checked, since their .def file is not loaded.
+    """
+    unknown = []
+    for command in _all_commands(tree):
+        for node, kind in def_argument_kinds(command):
+            names = declared.get(kind)
+            name = def_name(node) if names else None
+            if name is not None and name not in names:
+                line, column = node.contents_pos
+                unknown.append((kind, name, _range(line, column, name)))
+    return unknown

server/tests/python_tests/test_def_flow.py

@@ -180,3 +180,44 @@ def test_derived_names_are_not_renamed(tmp_path, monkeypatch):
         text_document=lsp.TextDocumentIdentifier(uri=caller.as_uri()), position=_position("absolute_mode")
     )
     assert lsp_server.prepare_rename(params) is None
+
+
+def _warnings(server, tmp_path: Path, source: str):
+    uri = (tmp_path / "check.tcl").as_uri()
+    server.workspace.put_text_document(lsp.TextDocumentItem(uri=uri, language_id="tcl", version=1, text=source))
+    diagnostics = server.lint(server.workspace.get_text_document(uri))
+    return [
+        (diagnostic.code, diagnostic.message, diagnostic.range.start.line, diagnostic.range.start.character, diagnostic.range.end.character)
+        for diagnostic in diagnostics
+        if diagnostic.code in {"unknown-block-template", "unknown-address"}
+    ]
+
+
+def test_unknown_template_and_address_are_warned(tmp_path, monkeypatch):
+    server, _ = _project(tmp_path, monkeypatch)
+    source = 'proc p {} {\n    MOM_do_template stedy_rest\n    MOM_force Once SPOS "SPSO"\n}\n'
+    assert _warnings(server, tmp_path, source) == [
+        ("unknown-block-template", "Block template 'stedy_rest' is not declared in any loaded .def file", 1, 20, 30),
+        ("unknown-address", "Address 'SPSO' is not declared in any loaded .def file", 2, 25, 29),
+    ]
+
+
+def test_known_and_dynamic_names_are_not_warned(tmp_path, monkeypatch):
+    server, _ = _project(tmp_path, monkeypatch)
+    source = 'MOM_do_template steady_rest CREATE\nMOM_do_template $name\nMOM_do_template "CYCLE_$x"\nMOM_force Once SPOS\n'
+    assert _warnings(server, tmp_path, source) == []
+
+
+def test_no_warnings_without_loaded_def_files(tmp_path, monkeypatch):
+    server, _ = _project(tmp_path, monkeypatch)
+    server.def_documents = {}
+    assert _warnings(server, tmp_path, "MOM_do_template stedy_rest\n") == []
+
+
+def test_def_change_invalidates_cached_diagnostics(tmp_path, monkeypatch):
+    server, caller = _project(tmp_path, monkeypatch)
+    server.compute_diagnostics(server.workspace.get_text_document(caller.as_uri()))
+    assert server.diagnostic_snapshot(caller.as_uri()) is not None
+    (tmp_path / "service" / "service.def").write_text(DEF.replace("absolute_mode", "incremental_mode"), encoding="utf-8")
+    server.refresh_def_symbols([tmp_path])
+    assert server.diagnostic_snapshot(caller.as_uri()) is None