Add errors for duplicate properties and blocks

blueprintcompiler/language/gobject_property.py

@@ -112,6 +112,14 @@ class Property(AstNode):
             )
 
 
+    @validate("name")
+    def unique_in_parent(self):
+        self.validate_unique_in_parent(
+            f"Duplicate property '{self.tokens['name']}'",
+            check=lambda child: child.tokens["name"] == self.tokens["name"]
+        )
+
+
     @docs("name")
     def property_docs(self):
         if self.gir_property is not None:

blueprintcompiler/language/gtk_a11y.py

@@ -139,6 +139,13 @@ class A11yProperty(BaseTypedAttribute):
                 did_you_mean=(self.tokens["name"], types.keys()),
             )
 
+    @validate("name")
+    def unique_in_parent(self):
+        self.validate_unique_in_parent(
+            f"Duplicate accessibility attribute '{self.tokens['name']}'",
+            check=lambda child: child.tokens["name"] == self.tokens["name"],
+        )
+
     @docs("name")
     def prop_docs(self):
         if self.tokens["name"] in get_types(self.root.gir):
@@ -156,6 +163,9 @@ class A11y(AstNode):
     def container_is_widget(self):
         validate_parent_type(self, "Gtk", "Widget", "accessibility properties")
 
+    @validate("accessibility")
+    def unique_in_parent(self):
+        self.validate_unique_in_parent("Duplicate accessibility block")
 
     def emit_xml(self, xml: XmlEmitter):
         xml.start_tag("accessibility")

blueprintcompiler/language/gtk_combo_box_text.py

@@ -56,6 +56,9 @@ class Items(AstNode):
     def container_is_combo_box_text(self):
         validate_parent_type(self, "Gtk", "ComboBoxText", "combo box items")
 
+    @validate("items")
+    def unique_in_parent(self):
+        self.validate_unique_in_parent("Duplicate items block")
 
     def emit_xml(self, xml: XmlEmitter):
         xml.start_tag("items")

blueprintcompiler/language/gtk_file_filter.py

@@ -27,6 +27,18 @@ class Filters(AstNode):
     def container_is_file_filter(self):
         validate_parent_type(self, "Gtk", "FileFilter", "file filter properties")
 
+    @validate()
+    def unique_in_parent(self):
+        # The token argument to validate() needs to be calculated based on
+        # the instance, hence wrapping it like this.
+        @validate(self.tokens["tag_name"])
+        def wrapped_validator(self):
+            self.validate_unique_in_parent(
+                f"Duplicate {self.tokens['tag_name']} block",
+                check=lambda child: child.tokens["tag_name"] == self.tokens["tag_name"],
+            )
+        wrapped_validator(self)
+
     def emit_xml(self, xml: XmlEmitter):
         xml.start_tag(self.tokens["tag_name"])
         for child in self.children:

blueprintcompiler/language/gtk_layout.py

@@ -31,6 +31,13 @@ class LayoutProperty(BaseAttribute):
         # there isn't really a way to validate these
         return None
 
+    @validate("name")
+    def unique_in_parent(self):
+        self.validate_unique_in_parent(
+            f"Duplicate layout property '{self.name}'",
+            check=lambda child: child.name == self.name,
+        )
+
 
 layout_prop = Group(
     LayoutProperty,
@@ -53,6 +60,9 @@ class Layout(AstNode):
     def container_is_widget(self):
         validate_parent_type(self, "Gtk", "Widget", "layout properties")
 
+    @validate("layout")
+    def unique_in_parent(self):
+        self.validate_unique_in_parent("Duplicate layout block")
 
     def emit_xml(self, xml: XmlEmitter):
         xml.start_tag("layout")

blueprintcompiler/language/gtk_size_group.py

@@ -55,6 +55,10 @@ class Widgets(AstNode):
     def container_is_size_group(self):
         validate_parent_type(self, "Gtk", "SizeGroup", "size group properties")
 
+    @validate("widgets")
+    def unique_in_parent(self):
+        self.validate_unique_in_parent("Duplicate widgets block")
+
     def emit_xml(self, xml: XmlEmitter):
         xml.start_tag("widgets")
         for child in self.children:

blueprintcompiler/language/gtk_string_list.py

@@ -51,6 +51,9 @@ class Strings(AstNode):
     def container_is_string_list(self):
         validate_parent_type(self, "Gtk", "StringList", "StringList items")
 
+    @validate("strings")
+    def unique_in_parent(self):
+        self.validate_unique_in_parent("Duplicate strings block")
 
     def emit_xml(self, xml: XmlEmitter):
         xml.start_tag("items")

blueprintcompiler/language/gtk_styles.py

@@ -41,6 +41,10 @@ class Styles(AstNode):
     def container_is_widget(self):
         validate_parent_type(self, "Gtk", "Widget", "style classes")
 
+    @validate("styles")
+    def unique_in_parent(self):
+        self.validate_unique_in_parent("Duplicate styles block")
+
     def emit_xml(self, xml: XmlEmitter):
         xml.start_tag("style")
         for child in self.children: