debug variant parsing

blueprintcompiler/language/values.py

@@ -28,6 +28,10 @@ from .gobject_object import Object
 from .types import TypeName
 from .variant import VarContent
 
+import gi
+gi.require_version("GLib", "2.0")
+from gi.repository import GLib
+
 
 class Translated(AstNode):
     grammar = AnyOf(
@@ -373,8 +377,17 @@ class IdentLiteral(AstNode):
             return None
 
 
+        
 class VariantValue(AstNode):
-    grammar = ["variant", "<", UseQuoted("type"), ">", "(", VarContent, ")"]
+    grammar = [
+        "variant",
+        "<",
+        UseQuoted("type"),
+        ">",
+        "(",
+        Err(VarContent, "Invalid variant content!"),
+        ")",
+    ]
 
     @property
     def var_type(self) -> str:
@@ -407,6 +420,24 @@ class VariantValue(AstNode):
             raise CompileError(f"Cannot convert variant into {expected_type.full_name}")
         pass
 
+    @validate("type")
+    def validate_type(self):
+        if not GLib.VariantType.string_is_valid(self.var_type):
+            raise CompileError(f"`{self.var_type}` is not a valid variant type")
+    
+    @validate()
+    def validate_content(self):
+        if not GLib.VariantType.string_is_valid(self.var_type):
+            return
+
+        try:
+            var_ty = GLib.VariantType.new(self.var_type)
+            var_val = GLib.Variant.parse(var_ty, self.var_value)
+        except GLib.GError as error:
+            raise CompileError(f"Variant did not match specified type: {error}")
+
+        pass
+
 
 class Literal(AstNode):
     grammar = AnyOf(