update lsp_server

server/src/tools/checks.py

@@ -1,4 +1,57 @@
+from enum import Enum
+from tclint.syntax_tree import Visitor, BareWord, Command
+from tclint.violations import Violation, Rule
+
+
+class Rules(Enum):
+    VALIDATION = "validation"
+    OPTIONAL_ARG_POSITION = "optinal_args"
+
+    def __str__(self):
+        return self.value
+
+
+class CommandArgsCheck(Visitor):
+    def __init__(self):
+        self._violations = []
+
+    def check(self, _, tree):
+        self._violations.clear()
+        tree.accept(self, recurse=True)
+        return self._violations
+
+    def visit_command(self, command: Command):
+        if (
+            not hasattr(command.routine, "contents")
+            or command.routine.contents != "proc"
+        ):
+            return
+        if len(command.args) < 2:
+            return
+
+        args_node = command.args[1]
+        if not hasattr(args_node, "children"):
+            return
+
+        found_optional = False
+        for arg in args_node.children:
+            # Required argument
+            if isinstance(arg, BareWord):
+                if found_optional:
+                    self._violations.append(
+                        Violation(
+                            Rules.OPTIONAL_ARG_POSITION,
+                            "Required argument follows optional one",
+                            arg.pos,
+                            arg.end_pos,
+                        )
+                    )
+            # Optional argument
+            elif hasattr(arg, "children") and len(arg.children) >= 2:
+                found_optional = True
+
+
 def get_checkers():
-    checkers = ()
+    checkers = (CommandArgsCheck(),)
 
     return checkers