tools: Add compile-lvs command

Fix: #91

Author: zjkmxy

src/ndn/bin/tools/__init__.py

@@ -16,31 +16,42 @@
 # limitations under the License.
 # -----------------------------------------------------------------------------
 import argparse
-from . import cmd_fetch_data, cmd_serve_data, cmd_fetch_rdrcontent, cmd_serve_rdrcontent
 
+from . import (
+    cmd_compile_lvs,
+    cmd_fetch_data,
+    cmd_fetch_rdrcontent,
+    cmd_serve_data,
+    cmd_serve_rdrcontent,
+)
 
-CMD_LIST = '''
+
+CMD_LIST = """
 Available commands:
   Serve-Data (poke,sd)
   Fetch-Data (peek,fd)
   Serve-RdrContent (putchunks,src)
   Fetch-RdrContent (catchunks,frc)
+  Compile-Lvs (compile-lvs)
 
 Try '%(prog)s COMMAND -h' for more information on each command
-'''
+"""
 
 
 def main():
-    parser = argparse.ArgumentParser(formatter_class=argparse.RawDescriptionHelpFormatter, epilog=CMD_LIST)
-    subparsers = parser.add_subparsers(metavar='COMMAND', help='sub-command to execute')
+    parser = argparse.ArgumentParser(
+        formatter_class=argparse.RawDescriptionHelpFormatter, epilog=CMD_LIST
+    )
+    subparsers = parser.add_subparsers(metavar="COMMAND", help="sub-command to execute")
 
     cmd_fetch_data.add_parser(subparsers)
     cmd_serve_data.add_parser(subparsers)
     cmd_fetch_rdrcontent.add_parser(subparsers)
     cmd_serve_rdrcontent.add_parser(subparsers)
+    cmd_compile_lvs.add_parser(subparsers)
 
     args = parser.parse_args()
-    if 'executor' not in args:
+    if "executor" not in args:
         parser.print_help()
         exit(-1)
 

src/ndn/bin/tools/cmd_compile_lvs.py

@@ -0,0 +1,70 @@
+# -----------------------------------------------------------------------------
+# Copyright (C) 2025-2025 The python-ndn authors
+#
+# This file is part of python-ndn.
+#
+# 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.
+# -----------------------------------------------------------------------------
+import argparse
+import os
+import sys
+
+import lark
+from ndn.app_support.light_versec import compile_lvs, SemanticError
+from ndn.app_support.light_versec.binary import *
+
+
+def add_parser(subparsers):
+    parser = subparsers.add_parser("Compile-Lvs", aliases=["compile-lvs"])
+    parser.add_argument(
+        "-o",
+        "--output",
+        metavar="FILE",
+        default="-",
+        help="Write compiled result into a file",
+    )
+    parser.add_argument(
+        "input_file",
+        metavar="FILE",
+        nargs="?",
+        default="-",
+        help="file containing the content of the LVS text, '-' for stdin (default)",
+    )
+    parser.set_defaults(executor=execute)
+
+
+def execute(args: argparse.Namespace):
+    try:
+        if args.input_file == "-":
+            text = sys.stdin.read()
+        else:
+            with open(os.path.expandvars(args.input_file), "r") as f:
+                text = f.read()
+    except (ValueError, OSError, IndexError):
+        print("Unable to read the input file")
+        return -1
+
+    try:
+        lvs_model = compile_lvs(text)
+    except (SemanticError, lark.UnexpectedInput) as e:
+        print("Unable to compile the LVS text input:", e)
+        return -2
+
+    encoded_output = bytes(lvs_model.encode())
+
+    if args.output:
+        if args.output == "-":
+            sys.stdout.buffer.write(encoded_output)
+        else:
+            with open(os.path.expandvars(args.output), "wb") as f:
+                f.write(encoded_output)