build(python): simplify rpycdec vendor layout

third_party/python/rpycdec/src/renpy/parameter.py

@@ -0,0 +1,63 @@
+from .. import util
+
+
+class Signature:
+    def get_code(self, **kwargs) -> str:
+        rv = []
+        parameters = util.attr(self, "parameters")
+        if isinstance(parameters, dict):
+            for name, value in parameters.items():
+                rv.append(util.get_code(value, **kwargs))
+        else:
+            for value in parameters:
+                rv.append(str(value))
+        if not rv:
+            return ""
+        return f"({', '.join(rv)})"
+
+
+class Parameter:
+
+    (
+        POSITIONAL_ONLY,
+        POSITIONAL_OR_KEYWORD,
+        VAR_POSITIONAL,
+        KEYWORD_ONLY,
+        VAR_KEYWORD,
+    ) = range(5)
+
+    def _variable_or_default(self, name, default):
+        return f"{name}={default}" if default is not None else f"{name}"
+
+    def get_code(self, **kwargs) -> str:
+        name = util.attr(self, "name")
+        kind = util.attr(self, "kind")
+        default = util.attr(self, "default")
+        if kind == self.POSITIONAL_ONLY:
+            return self._variable_or_default(name, default)
+        elif kind == self.POSITIONAL_OR_KEYWORD:
+            return self._variable_or_default(name, default)
+        elif kind == self.VAR_POSITIONAL:
+            return f"*{name}"
+        elif kind == self.KEYWORD_ONLY:
+            return self._variable_or_default(name, default)
+        elif kind == self.VAR_KEYWORD:
+            return f"**{name}"
+        else:
+            raise ValueError(f"Unknown parameter kind: {kind}")
+
+
+class ArgumentInfo:
+
+    def get_code(self, **kwargs) -> str:
+        rv = []
+        for i, (keyword, expression) in enumerate(self.arguments):
+            if i in self.starred_indexes:
+                rv.append("*" + expression)
+            elif i in self.doublestarred_indexes:
+                rv.append("**" + expression)
+            elif keyword is not None:
+                rv.append("{}={}".format(keyword, expression))
+            else:
+                rv.append(str(expression))
+        return "(" + ", ".join(rv) + ")"