Sync v2.0 version of code to github repo

fastdeploy/model_executor/guided_decoding/__init__.py

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+"""
+# Copyright (c) 2025  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.
+"""
+
+# from fastdeploy.config import FDConfig
+
+__all__ = ['get_guided_backend', 'schema_checker']
+
+
+def get_guided_backend(
+    fd_config,
+    **kwargs,
+):
+    """
+    Get the guided decoding backend instance based on configuration.
+
+    Args:
+        fd_config (FDConfig): FastDeploy configuration object containing backend settings
+        **kwargs: Additional arguments passed to the backend constructor
+
+    Returns:
+        BaseBackend: An instance of the specified guided decoding backend
+
+    Raises:
+        ValueError: If the specified backend is not supported
+    """
+    if fd_config.parallel_config.guided_decoding_backend.lower() == "xgrammar":
+        from fastdeploy.model_executor.guided_decoding.xgrammar_backend import \
+            XGrammarBackend
+        return XGrammarBackend(
+            fd_config=fd_config,
+            **kwargs,
+        )
+    else:
+        raise ValueError(
+            f"Get unsupported backend {fd_config.parallel_config.guided_decoding_backend},"
+            f" please check your configuration.")
+
+
+def schema_checker(backend_name: str, **kwargs):
+    """
+    Get the schema checker instance for the specified backend.
+
+    Args:
+        backend_name (str): Name of the backend (e.g. "xgrammar")
+        **kwargs: Additional arguments passed to the checker constructor
+
+    Returns:
+        BaseChecker: An instance of the specified schema checker
+
+    Raises:
+        ValueError: If the specified backend is not supported
+    """
+    if backend_name.lower() == "xgrammar":
+        from fastdeploy.model_executor.guided_decoding.xgrammar_backend import \
+            XGrammarChecker
+        return XGrammarChecker(**kwargs)
+    else:
+        raise ValueError(
+            f"Get unsupported backend {backend_name}, please check your configuration."
+        )