semantic: refactor types and variable handling

compiler/semantic.py

@@ -52,6 +52,7 @@ class Context:
     def __init__(self, name: str | None = None, parent: Context | None = None):
         self.parent = parent
         self.variables: dict[str, Variable] = {}
+        self.types: dict[str, Type] = {}
         self.child_contexts: dict[str, Context] = {}
         self.name = str(Context._id_sequence)
         if name is not None:
@@ -63,18 +64,20 @@ class Context:
             return str(self.name)
         return f"{self.parent.fully_qualified_name()}::{self.name}"
 
-    def get_variable(self, name: str) -> Variable | None:
-        if name in self.variables:
-            return self.variables[name]
+    @typecheck
+    def _resolve_symbol(self, attribute_name: str, name: str) -> SymbolABC | None:
+        attribute = getattr(self, attribute_name)
+        if name in attribute:
+            return attribute[name]
         elif self.parent is None:
             return None
-        elif (var := self.parent.get_variable(name)) is not None:
+        elif (var := self.parent._resolve_symbol(attribute_name, name)) is not None:
             return var
 
         return None
 
-    def add_context(self, context: Context) -> None:
-        self.child_contexts[context.name] = context
+    def get_variable(self, name: str) -> Variable | None:
+        return self._resolve_symbol("variables", name)
 
     def set_variable(self, name: str, value: nodes.Value) -> Variable:
         variable: Variable
@@ -88,6 +91,26 @@ class Context:
 
         return variable
 
+    @typecheck
+    def set_type(self, name: str, value: nodes.Value) -> Type | None:
+        typedef: Type
+        if name in self.types:
+            typedef = self.types[name]
+            typedef.definitions += [value]
+        else:
+            typedef = Type(self, name, value)
+
+        self.types[name] = typedef
+
+        return typedef
+
+    @typecheck
+    def get_type(self, name: str) -> Type | None:
+        return self._resolve_symbol("types", name)
+
+    def add_context(self, context: Context) -> None:
+        self.child_contexts[context.name] = context
+
     def __str__(self):
         return f"{self.__class__.__name__}(id={repr(self.name)})"