| #!/usr/bin/env python3.8 |
| # Copyright 2019 The Fuchsia Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| import difflib |
| import json |
| import sys |
| |
| def usage(): |
| print('Usage:\n' |
| ' diff_json.py FILE1 FILE2 OUTPUT\n' |
| ' Generates canonical json text for FILE1 and FILE2, then does a normal text comparison,\n' |
| ' writing the diff output to OUTPUT.') |
| |
| def main(): |
| if (len(sys.argv) != 4): |
| usage() |
| exit(-1) |
| try: |
| with open(sys.argv[1], 'r') as file1: |
| with open(sys.argv[2], 'r') as file2: |
| with open(sys.argv[3], 'w') as result: |
| json1 = json.load(file1) |
| json2 = json.load(file2) |
| canon1 = json.dumps(json1, sort_keys=True, indent=2).splitlines() |
| canon2 = json.dumps(json2, sort_keys=True, indent=2).splitlines() |
| diff = difflib.unified_diff(canon1, canon2, sys.argv[1], sys.argv[2], lineterm='') |
| diffstr = '\n'.join(diff) |
| result.write(diffstr) |
| if (len(diffstr) != 0): |
| print(f'Error: non-empty diff between canonical json representations:\n{diffstr}') |
| exit(-4) |
| except IOError as e: |
| print(f'Error accessing files: {e}') |
| usage() |
| exit(-2) |
| except ValueError as e: |
| print(f'Error decoding json: {e}') |
| exit(-3) |
| |
| if __name__ == '__main__': |
| sys.exit(main()) |