| import argparse |
| import ijson |
| import json |
| import sys |
| import os |
|
|
|
|
| def print_first_item(file_path): |
| """ |
| Prints the first top-level item from a JSON file using a streaming parser. |
| |
| Args: |
| file_path (str): The path to the JSON file. |
| """ |
| try: |
| with open(file_path, "rb") as file: |
| |
| |
| |
| parser = ijson.items(file, "item") |
|
|
| first_item = next(parser) |
| print(json.dumps(first_item, indent=2)) |
|
|
| except FileNotFoundError: |
| print(f"Error: File not found at {file_path}", file=sys.stderr) |
| sys.exit(1) |
| except StopIteration: |
| print(f"Error: No items found in the JSON file {file_path}", file=sys.stderr) |
| sys.exit(1) |
| except ijson.JSONError as e: |
| print(f"Error parsing JSON file {file_path}: {e}", file=sys.stderr) |
| sys.exit(1) |
| except Exception as e: |
| print(f"An unexpected error occurred: {e}", file=sys.stderr) |
| sys.exit(1) |
|
|
|
|
| def main(): |
| parser = argparse.ArgumentParser( |
| description="Print the first top-level item from a JSON file using a streaming parser." |
| ) |
| parser.add_argument("json_file", help="Path to the input JSON file.") |
| args = parser.parse_args() |
|
|
| if not os.path.exists(args.json_file): |
| print(f"Error: File not found at {args.json_file}", file=sys.stderr) |
| sys.exit(1) |
|
|
| print_first_item(args.json_file) |
|
|
|
|
| if __name__ == "__main__": |
| main() |
|
|
