# vim: ft=python fileencoding=utf-8 sts=4 sw=4 et:

# Copyright 2014-2015 Florian Bruhin (The Compiler) <mail@qutebrowser.org>
#
# This file is part of qutebrowser.
#
# qutebrowser 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.
#
# qutebrowser 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 qutebrowser.  If not, see <http://www.gnu.org/licenses/>.

"""
Provides test data for overflow checking.

Module attributes:
    INT32_MIN: Minimum valid value for a signed int32.
    INT32_MAX: Maximum valid value for a signed int32.
    INT64_MIN: Minimum valid value for a signed int64.
    INT64_MAX: Maximum valid value for a signed int64.
    GOOD_VALUES: A dict of types mapped to a list of good values.
    BAD_VALUES: A dict of types mapped to a list of bad values.
"""

INT32_MIN = -(2 ** 31)
INT32_MAX = 2 ** 31 - 1
INT64_MIN = -(2 ** 63)
INT64_MAX = 2 ** 63 - 1

GOOD_VALUES = {
    'int': [-1, 0, 1, 23.42, INT32_MIN, INT32_MAX],
    'int64': [-1, 0, 1, 23.42, INT64_MIN, INT64_MAX],
}

BAD_VALUES = {
    'int': [(INT32_MIN - 1, INT32_MIN),
            (INT32_MAX + 1, INT32_MAX),
            (float(INT32_MAX + 1), INT32_MAX)],
    'int64': [(INT64_MIN - 1, INT64_MIN),
              (INT64_MAX + 1, INT64_MAX),
              (float(INT64_MAX + 1), INT64_MAX)],
}


def iter_good_values():
    """
    Yields pairs of (c data type, value) which should pass overflow
    checking.
    """
    for ctype, values in GOOD_VALUES.items():
        for value in values:
            yield ctype, value


def iter_bad_values():
    """
    Yields pairs of (c type, value, repl) for values which don't pass
    overflow checking, and a value they should be replaced with if overflow
    checking should not be fatal.
    """
    for ctype, values in BAD_VALUES.items():
        for value, repl in values:
            yield ctype, value, repl