chore: import upstream snapshot with attribution

paddle/ap/include/code_module/file.h

@@ -0,0 +1,48 @@
+// Copyright (c) 2024 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+#include "paddle/ap/include/adt/adt.h"
+#include "paddle/ap/include/axpr/type.h"
+#include "paddle/ap/include/code_module/directory.h"
+#include "paddle/ap/include/code_module/file_content.h"
+#include "paddle/ap/include/code_module/soft_link.h"
+
+namespace ap::code_module {
+
+template <typename FileT>
+using FileImpl = std::variant<FileContent, SoftLink, Directory<FileT>>;
+
+struct File : public FileImpl<File> {
+  using FileImpl<File>::FileImpl;
+  ADT_DEFINE_VARIANT_METHODS(FileImpl<File>);
+
+  static adt::Result<File> CastFromAxprValue(const axpr::Value& val) {
+    if (val.template CastableTo<FileContent>()) {
+      ADT_LET_CONST_REF(file_content, val.template CastTo<FileContent>());
+      return file_content;
+    }
+    if (val.template CastableTo<SoftLink>()) {
+      ADT_LET_CONST_REF(soft_link, val.template CastTo<SoftLink>());
+      return soft_link;
+    }
+    if (val.template CastableTo<Directory<File>>()) {
+      ADT_LET_CONST_REF(directory, val.template CastTo<Directory<File>>());
+      return directory;
+    }
+    return adt::errors::TypeError{"File::CastFromAxprValue() failed."};
+  }
+};
+
+}  // namespace ap::code_module