signals: Support after keyword

blueprintcompiler/language/gobject_signal.py

@@ -166,11 +166,18 @@ class Signal(AstNode):
 
 
 @decompiler("signal")
-def decompile_signal(ctx, gir, name, handler, swapped="false", object=None):
+def decompile_signal(
+    ctx, gir, name, handler, swapped="false", after="false", object=None
+):
     object_name = object or ""
     name = name.replace("_", "-")
+    line = f"{name} => ${handler}({object_name})"
+
     if decompile.truthy(swapped):
-        ctx.print(f"{name} => ${handler}({object_name}) swapped;")
-    else:
-        ctx.print(f"{name} => ${handler}({object_name});")
+        line += " swapped"
+    if decompile.truthy(after):
+        line += " after"
+
+    line += ";"
+    ctx.print(line)
     return gir

blueprintcompiler/outputs/xml/__init__.py

@@ -161,6 +161,7 @@ class XmlOutput(OutputFormat):
             name=name,
             handler=signal.handler,
             swapped=signal.is_swapped or None,
+            after=signal.is_after or None,
             object=(
                 self._object_id(signal, signal.object_id) if signal.object_id else None
             ),

tests/samples/signal.blp

@@ -5,6 +5,6 @@ Entry {
 }
 
 Button button {
-  clicked => $on_button_clicked() swapped;
+  clicked => $on_button_clicked() swapped after;
   notify::visible => $on_button_notify_visible();
 }

tests/samples/signal.ui

@@ -10,7 +10,7 @@ corresponding .blp file and regenerate this file with blueprint-compiler.
     <signal name="activate" handler="click" object="button"/>
   </object>
   <object class="GtkButton" id="button">
-    <signal name="clicked" handler="on_button_clicked" swapped="True"/>
+    <signal name="clicked" handler="on_button_clicked" swapped="True" after="True"/>
     <signal name="notify::visible" handler="on_button_notify_visible"/>
   </object>
 </interface>