Convert JSONC to JSON from stdin or file

jsonc_to_json.py

#!/usr/bin/env python3
#   Convert a JSONC (JSON with Comments) file to vanilla JSON from CLI
#
#   Sample usage:
#       cat sample.jsonc | ./scripts/jsonc_to_json.py | jq
#       python3 jsonc_to_json.py sample.jsonc
import re
import sys


# https://stackoverflow.com/a/23705538
def removeTrailingJsonCommas(jsonText):
    jsonText = re.sub(",[ \t\r\n]+}", "}", jsonText)
    jsonText = re.sub(",[ \t\r\n]+\]", "]", jsonText)
    return jsonText


# https://stackoverflow.com/a/241506
def removeComments(text):

    def replacer(match):
        s = match.group(0)
        if s.startswith('/'):
            return " "  # note: a space and not an empty string
        else:
            return s

    pattern = re.compile(
        r'//.*?$|/\*.*?\*/|\'(?:\\.|[^\\\'])*\'|"(?:\\.|[^\\"])*"',
        re.DOTALL | re.MULTILINE)
    return re.sub(pattern, replacer, text)


def main():
    # Read from either file specified from CLI arg or stdin
    if len(sys.argv) > 1:
        with open(sys.argv[1]) as f:
            fileStr = f.read()
    else:
        fileStr = sys.stdin.read()

    fileStr = removeTrailingJsonCommas(fileStr)
    fileStr = removeComments(fileStr)
    print(fileStr)


if __name__ == "__main__":
    main()