Use dictionary for calling input filters (#56089)

Summary:
Pull Request resolved: #56089

Changelog: [Internal]

Replaces chained input filter calls with an iteration over a dict.

Reviewed By: cipolleschi

Differential Revision: D96455826

fbshipit-source-id: bdaf44285db6d3432a6401d6118f245abfa7dafb

Author: coado

scripts/cxx-api/parser/input_filters/main.py

@@ -14,6 +14,13 @@
 from strip_deprecated_msg import strip_deprecated_msg
 from strip_ns_unavailable import strip_ns_unavailable
 
+FILTERS = [
+    strip_block_comments,
+    strip_deprecated_msg,
+    strip_ns_unavailable,
+    encode_objc_interface_generics,
+]
+
 
 def main():
     if len(sys.argv) < 2:
@@ -26,10 +33,10 @@ def main():
         with open(filename, "r", encoding="utf-8", errors="replace") as f:
             content = f.read()
 
-        filtered = strip_block_comments(content)
-        filtered = strip_deprecated_msg(filtered)
-        filtered = strip_ns_unavailable(filtered)
-        filtered = encode_objc_interface_generics(filtered)
+        filtered = content
+        for filter_fn in FILTERS:
+            filtered = filter_fn(filtered)
+
         print(filtered, end="")
     except Exception as e:
         # On error, output original content to not break the build