| #!/usr/bin/env fuchsia-vendored-python |
| # 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()) |