filter-java-imports.py

#!/usr/bin/env python

import re
import sys

number_re = re.compile('^[0-9]+$')


def extract_coordinate(part):
    ## print 'PART', part
    return part.split(']')[0]


def extract_coordinates(name):
    return map(extract_coordinate, name.split('[')[1:])


def allowed(importer, imported):
    if importer == imported:
        return None
    if number_re.match(importer) and number_re.match(imported):
        importer_number = int(importer)
        imported_number = int(imported)
        if imported_number <= importer_number:
            return True
    print 'DISALLOWED', importer, imported
    return False


def check_import(importer_name, imported_name):
    importer = extract_coordinates(importer_name)
    imported = extract_coordinates(imported_name)
    ## print 'COORDINATES', importer, imported
    while importer and imported:
        status = allowed(importer[0], imported[0])  # Can be either True, False, or None
        if status is None:
            return status
        del importer[0]
        del imported[0]
    if importer:
        print 'DISALLOWED', importer[0], '?'
        return False
    return True


def main():
    while True:
        line = sys.stdin.readline()
        if not line:
            break
        if line[-1:] == '\n':
            line = line[:-1]
        dummy, importer, imported = line.split(':')
        ## print 'NAMES', importer, imported
        if not check_import(importer, imported):
            print 'WARNING', importer, imported

main()