#!/usr/bin/env python3

# vim: sw=4 ts=4 et si:

import sys

class ValidationError(Exception):

    pass

class PatchException(Exception):

    def __init__(self, errors):

        Exception.__init__(self, "Validation Error")

        self._errors = errors

    def errors(self, error=None):

        count = 0

        if error is None:

            return len(self._errors)

        for err in self._errors:

            if isinstance(err, error):

                count += 1

        return count

    def __str__(self):

        return "\n".join("** %s" % str(x) for x in self._errors)

    def __repr__(self):

        ret = "%d errors:\n" % len(self._errors)

        ret += "\n".join(self._errors)

        return ret

    def error_message(self, fn):

        ret = "ERROR: Problems encountered in "

        if fn:

            ret += "`%s'\n" % fn

        else:

            ret += "input\n"

        ret += str(self)

        return ret

class PatchChecker:

    def __init__(self):

        pass

    def do_patch(self):

        pass