Use typelib instead of XML

For normal compilation, use .typelib files rather than .gir XML files.
This is much faster.

Rather than using libgirepository, which would try to actually load the
libraries, we use a custom parser.

The language server will still read XML because it needs to access
documentation, which is not in the typelib, but that's generally fine
because it's a long lived process and only has to do that once.

blueprintcompiler/decompiler.py

@@ -122,8 +122,13 @@ class DecompileCtx:
                 self._blocks_need_end[-1] = _CLOSING[line[-1]]
             self._indent += 1
 
-
     def print_attribute(self, name, value, type):
+        def get_enum_name(value):
+            for member in type.members.values():
+                if member.nick == value or member.c_ident == value:
+                    return member.name
+            return value.replace('-', '_')
+
         if type is None:
             self.print(f"{name}: \"{escape_quote(value)}\";")
         elif type.assignable_to(FloatType()):
@@ -141,16 +146,11 @@ class DecompileCtx:
             self.print(f"{name}: \"{escape_quote(value)}\";")
         elif type.assignable_to(self.gir.namespaces["Gtk"].lookup_type("GObject.Object")):
             self.print(f"{name}: {value};")
-        elif isinstance(type, Enumeration):
-            for member in type.members.values():
-                if member.nick == value or member.c_ident == value:
-                    self.print(f"{name}: {member.name};")
-                    break
-            else:
-                self.print(f"{name}: {value.replace('-', '_')};")
         elif isinstance(type, Bitfield):
-            flags = re.sub(r"\s*\|\s*", " | ", value).replace("-", "_")
-            self.print(f"{name}: {flags};")
+            flags = [get_enum_name(flag) for flag in value.split("|")]
+            self.print(f"{name}: {' | '.join(flags)};")
+        elif isinstance(type, Enumeration):
+            self.print(f"{name}: {get_enum_name(value)};")
         else:
             self.print(f"{name}: \"{escape_quote(value)}\";")
 
@@ -171,9 +171,8 @@ def _decompile_element(ctx: DecompileCtx, gir, xml):
         ctx.start_block()
         gir = decompiler(ctx, gir, **args)
 
-        for child_type in xml.children.values():
-            for child in child_type:
-                _decompile_element(ctx, gir, child)
+        for child in xml.children:
+            _decompile_element(ctx, gir, child)
 
         ctx.end_block()