preliminary variant syntax

blueprintcompiler/language/values.py

@@ -371,6 +371,42 @@ class IdentLiteral(AstNode):
         else:
             return None
 
+class VariantValue(AstNode):
+    grammar = [
+        "variant",
+        "<",
+        UseQuoted("type"),
+        ">",
+        "(",
+        UseQuoted("value"),
+        ")"
+    ]
+
+    @property
+    def var_type(self) -> str:
+        return self.tokens["type"]
+
+    @property
+    def var_value(self) -> str:
+        return self.tokens["value"]
+
+    @validate()
+    def validate_for_type(self) -> None:
+        expected_type = self.context[ValueTypeCtx].value_type
+        if (
+            isinstance(expected_type, gir.IntType)
+            or isinstance(expected_type, gir.UIntType)
+            or isinstance(expected_type, gir.FloatType)
+            or isinstance(expected_type, gir.FloatType)
+        ):
+            raise CompileError(f"Cannot convert variant to number")
+        elif isinstance(expected_type, gir.StringType):
+            raise CompileError("Cannot convert variant to string")
+        if isinstance(expected_type, gir.Boxed) and expected_type.full_name == "GLib.Variant":
+            pass
+        else:
+            raise CompileError(f"Cannot convert variant into {expected_type.full_name}")
+        pass
 
 class Literal(AstNode):
     grammar = AnyOf(