rewriter: Rewrite how we add/remove source files

Change the semantics of IntrospectionBuildTarget.source_nodes
and IntrospectionBuildTarget.extra_files .

The rewriter and the static introspection tool used to be very broken,
now it is *less* broken, hence we add some tests in this commit.

Fixes #11763

1 files changed, 7 insertions, 0 deletions

diff --git a/mesonbuild/mparser.py b/mesonbuild/mparser.py
index a0a8d273e..3dd8f0a5e 100644
--- a/mesonbuild/mparser.py
+++ b/mesonbuild/mparser.py
@@ -369,6 +369,13 @@ class ArgumentNode(BaseNode):
             mlog.warning('This will be an error in Meson 2.0.')
         self.kwargs[name] = value
 
+    def get_kwarg_or_default(self, name: str, default: BaseNode) -> BaseNode:
+        for k, v in self.kwargs.items():
+            assert isinstance(k, IdNode)
+            if k.value == name:
+                return v
+        return default
+
     def set_kwarg_no_check(self, name: BaseNode, value: BaseNode) -> None:
         self.kwargs[name] = value