#
# Copyright (C) 2017-2020 Dimitar Toshkov Zhekov <dimitar.zhekov@gmail.com>
#
# 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 2 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#

import sys

# -- Various --
UNICODE_MAX = 1114111  # 0x10FFFF
UNICODE_BMP_MAX = 65535  # 0xFFFF

def parse_dec(name, s, min_value=0, max_value=UNICODE_MAX):
	try:
		value = int(s)
	except ValueError:
		raise Exception('invalid %s format' % name)

	if min_value is not None and value < min_value:
		raise Exception('%s must be >= %d' % (name, min_value))

	if max_value is not None and value > max_value:
		raise Exception('%s must be <= %d' % (name, max_value))

	return value


def parse_hex(name, s, min_value=0, max_value=UNICODE_MAX):
	try:
		value = int(s, 16)
	except ValueError:
		raise Exception('invalid %s format' % name)

	if min_value is not None and value < min_value:
		raise Exception('%s must be >= %X' % (name, min_value))

	if max_value is not None and value > max_value:
		raise Exception('%s must be <= %X' % (name, max_value))

	return value


def quote(bstr):
	return b'"%s"' % bstr.replace(b'"', b'""')


def unquote(bstr, name=None):
	if len(bstr) >= 2 and bstr.startswith(b'"') and bstr.endswith(b'"'):
		bstr = bstr[1 : len(bstr) - 1].replace(b'""', b'"')
	elif name is not None:
		raise Exception(name + ' must be quoted')

	return bstr


def message(prefix, severity, text):
	sys.stderr.write('%s%s%s\n' % (prefix, severity + ': ' if severity else '', text))


def warning(prefix, text):
	message(prefix, 'warning', text)


def split_words(name, value, count):
	words = value.split(None, count)

	if len(words) != count:
		raise Exception('%s must contain %d values' % (name, count))

	return words


GPL2PLUS_LICENSE = ('' +
	'This program is free software; you can redistribute it and/or modify it\n' +
	'under the terms of the GNU General Public License as published by the Free\n' +
	'Software Foundation; either version 2 of the License, or (at your option)\n' +
	'any later version.\n' +
	'\n' +
	'This program is distributed in the hope that it will be useful, but\n' +
	'WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY\n' +
	'or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License\n' +
	'for more details.\n' +
	'\n' +
	'You should have received a copy of the GNU General Public License along\n' +
	'with this program; if not, write to the Free Software Foundation, Inc.,\n' +
	'51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.\n')