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/usr/lib/python2.7/dist-packages/sure/old.py is in python-sure 1.2.5-3.

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The actual contents of the file can be viewed below.

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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# <sure - utility belt for automated testing in python>
# Copyright (C) <2010-2013>  Gabriel Falcão <gabriel@nacaolivre.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
from __future__ import unicode_literals

import re
import traceback
import inspect
from copy import deepcopy
from pprint import pformat
from functools import wraps
try:
    from collections import Iterable
except ImportError:
    Iterable = (list, dict, tuple, set)

try:
    import __builtin__ as builtins
except ImportError:
    import builtins

from six import string_types, text_type

from sure.core import DeepComparison
from sure.core import _get_file_name
from sure.core import _get_line_number
from sure.core import itemize_length


def is_iterable(obj):
    return hasattr(obj, '__iter__') and not isinstance(obj, string_types)


def all_integers(obj):
    if not is_iterable(obj):
        return

    for element in obj:
        if not isinstance(element, int):
            return

    return True


def explanation(msg):
    def dec(func):
        @wraps(func)
        def wrap(self, what):
            ret = func(self, what)
            assert ret, msg % (self._src, what)
            return True

        return wrap

    return dec


class AssertionHelper(object):
    def __init__(self, src,
                 within_range=None,
                 with_args=None,
                 with_kwargs=None,
                 and_kwargs=None):

        self._src = src
        self._attribute = None
        self._eval = None
        self._range = None
        if all_integers(within_range):
            if len(within_range) != 2:
                raise TypeError(
                    'within_range parameter must be a tuple with 2 objects',
                )

            self._range = within_range

        self._callable_args = []
        if isinstance(with_args, (list, tuple)):
            self._callable_args = list(with_args)

        self._callable_kw = {}
        if isinstance(with_kwargs, dict):
            self._callable_kw.update(with_kwargs)

        if isinstance(and_kwargs, dict):
            self._callable_kw.update(and_kwargs)

    @classmethod
    def is_a_matcher(cls, func):
        def match(self, *args, **kw):
            return func(self._src, *args, **kw)

        new_matcher = deepcopy(match)
        new_matcher.__name__ = func.__name__
        setattr(cls, func.__name__, new_matcher)

        return new_matcher

    def raises(self, exc, msg=None):
        if not callable(self._src):
            raise TypeError('%r is not callable' % self._src)

        try:
            self._src(*self._callable_args, **self._callable_kw)
        except BaseException as e:
            if isinstance(exc, string_types):
                msg = exc
                exc = type(e)

            err = text_type(e)

            if isinstance(exc, type) and issubclass(exc, BaseException):
                if not isinstance(e, exc):
                    raise AssertionError(
                        '%r should raise %r, but raised %r:\nORIGINAL EXCEPTION:\n\n%s' % (
                            self._src, exc, e.__class__, traceback.format_exc(e)))

                if isinstance(msg, string_types) and msg not in err:
                    raise AssertionError('''
                    %r raised %s, but the exception message does not
                    match.\n\nEXPECTED:\n%s\n\nGOT:\n%s'''.strip() % (
                            self._src,
                            type(e).__name__,
                            msg, err))

            elif isinstance(msg, string_types) and msg not in err:
                raise AssertionError(
                    'When calling %r the exception message does not match. ' \
                    'Expected: %r\n got:\n %r' % (self._src, msg, err))

            else:
                raise e
        else:
            if inspect.isbuiltin(self._src):
                _src_filename = '<built-in function>'
            else:
                _src_filename = _get_file_name(self._src)

            if inspect.isfunction(self._src):
                _src_lineno = _get_line_number(self._src)
                raise AssertionError(
                    'calling function %s(%s at line: "%d") with args %r and kwargs %r did not raise %r' % (
                        self._src.__name__,
                        _src_filename, _src_lineno,
                        self._callable_args,
                        self._callable_kw, exc))
            else:
                raise AssertionError(
                    'at %s:\ncalling %s() with args %r and kwargs %r did not raise %r' % (
                        _src_filename,
                        self._src.__name__,
                        self._callable_args,
                        self._callable_kw, exc))

        return True

    def deep_equals(self, dst):
        deep = DeepComparison(self._src, dst)
        comparison = deep.compare()
        if isinstance(comparison, bool):
            return comparison

        raise comparison.as_assertion(self._src, dst)

    def equals(self, dst):
        if self._attribute and is_iterable(self._src):
            msg = '%r[%d].%s should be %r, but is %r'

            for index, item in enumerate(self._src):
                if self._range:
                    if index < self._range[0] or index > self._range[1]:
                        continue

                attribute = getattr(item, self._attribute)
                error = msg % (
                    self._src, index, self._attribute, dst, attribute)
                if attribute != dst:
                    raise AssertionError(error)
        else:
            return self.deep_equals(dst)

        return True

    def looks_like(self, dst):
        old_src = pformat(self._src)
        old_dst = pformat(dst)
        self._src = re.sub(r'\s', '', self._src).lower()
        dst = re.sub(r'\s', '', dst).lower()
        error = '%s does not look like %s' % (old_src, old_dst)
        assert self._src == dst, error
        return self._src == dst

    def every_one_is(self, dst):
        msg = 'all members of %r should be %r, but the %dth is %r'
        for index, item in enumerate(self._src):
            if self._range:
                if index < self._range[0] or index > self._range[1]:
                    continue

            error = msg % (self._src, dst, index, item)
            if item != dst:
                raise AssertionError(error)

        return True

    @explanation('%r should differ to %r, but is the same thing')
    def differs(self, dst):
        return self._src != dst

    @explanation('%r should be a instance of %r, but is not')
    def is_a(self, dst):
        return isinstance(self._src, dst)

    def at(self, key):
        assert self.has(key)
        if isinstance(self._src, dict):
            return AssertionHelper(self._src[key])

        else:
            return AssertionHelper(getattr(self._src, key))

    @explanation('%r should have %r, but have not')
    def has(self, that):
        return that in self

    def _get_that(self, that):
        try:
            that = int(that)
        except TypeError:
            that = len(that)
        return that

    def len_greater_than(self, that):
        that = self._get_that(that)
        length = len(self._src)

        if length <= that:
            error = 'the length of the %s should be greater then %d, but is %d' % (
                type(self._src).__name__,
                that,
                length,
            )
            raise AssertionError(error)

        return True

    def len_greater_than_or_equals(self, that):
        that = self._get_that(that)

        length = len(self._src)

        if length < that:
            error = 'the length of %r should be greater then or equals %d, but is %d' % (
                self._src,
                that,
                length,
            )
            raise AssertionError(error)

        return True

    def len_lower_than(self, that):
        original_that = that
        if isinstance(that, Iterable):
            that = len(that)
        else:
            that = self._get_that(that)
        length = len(self._src)

        if length >= that:
            error = 'the length of %r should be lower then %r, but is %d' % (
                self._src,
                original_that,
                length,
            )
            raise AssertionError(error)

        return True

    def len_lower_than_or_equals(self, that):
        that = self._get_that(that)

        length = len(self._src)
        error = 'the length of %r should be lower then or equals %d, but is %d'

        if length > that:
            msg = error % (
                self._src,
                that,
                length,
            )
            raise AssertionError(msg)

        return True

    def len_is(self, that):
        that = self._get_that(that)
        length = len(self._src)

        if length != that:
            error = 'the length of %r should be %d, but is %d' % (
                self._src,
                that,
                length,
            )
            raise AssertionError(error)

        return True

    def len_is_not(self, that):
        that = self._get_that(that)
        length = len(self._src)

        if length == that:
            error = 'the length of %r should not be %d' % (
                self._src,
                that,
            )
            raise AssertionError(error)

        return True

    def like(self, that):
        return self.has(that)

    def the_attribute(self, attr):
        self._attribute = attr
        return self

    def in_each(self, attr):
        self._eval = attr
        return self

    def matches(self, items):
        msg = '%r[%d].%s should be %r, but is %r'
        get_eval = lambda item: eval(
            "%s.%s" % ('current', self._eval), {}, {'current': item},
        )

        if self._eval and is_iterable(self._src):
            if isinstance(items, string_types):
                items = [items for x in range(len(items))]
            else:
                if len(items) != len(self._src):
                    source = list(map(get_eval, self._src))
                    source_len = len(source)
                    items_len = len(items)

                    raise AssertionError(
                        '%r has %d items, but the matching list has %d: %r'
                        % (source, source_len, items_len, items),
                    )

            for index, (item, other) in enumerate(zip(self._src, items)):
                if self._range:
                    if index < self._range[0] or index > self._range[1]:
                        continue

                value = get_eval(item)

                error = msg % (self._src, index, self._eval, other, value)
                if other != value:
                    raise AssertionError(error)
        else:
            return self.equals(items)

        return True

    @builtins.property
    def is_empty(self):
        try:
            lst = list(self._src)
            length = len(lst)
            assert length == 0, \
                   '%r is not empty, it has %s' % (self._src,
                                                   itemize_length(self._src))
            return True

        except TypeError:
            raise AssertionError("%r is not iterable" % self._src)

    @builtins.property
    def are_empty(self):
        return self.is_empty

    def __contains__(self, what):
        if isinstance(self._src, dict):
            items = self._src.keys()

        if isinstance(self._src, Iterable):
            items = self._src
        else:
            items = dir(self._src)

        return what in items

    def contains(self, what):
        assert what in self._src, '%r should be in %r' % (what, self._src)
        return True

    def does_not_contain(self, what):
        assert what not in self._src, \
            '%r should NOT be in %r' % (what, self._src)

        return True

    doesnt_contain = does_not_contain


that = AssertionHelper