######################## BEGIN LICENSE BLOCK ########################
# The Original Code is Mozilla Universal charset detector code.
#
# The Initial Developer of the Original Code is
# Netscape Communications Corporation.
# Portions created by the Initial Developer are Copyright (C) 2001
# the Initial Developer. All Rights Reserved.
#
# Contributor(s):
#   Mark Pilgrim - port to Python
#   Shy Shalom - original C code
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
# 02110-1301  USA
######################### END LICENSE BLOCK #########################

import constants, re

class CharSetProber:
	def __init__(self):
		pass

	def reset(self):
		self._mState = constants.eDetecting

	def get_charset_name(self):
		return None

	def feed(self, aBuf):
		pass

	def get_state(self):
		return self._mState

	def get_confidence(self):
		return 0.0

	def filter_high_bit_only(self, aBuf):
		aBuf = re.sub(r'([\x00-\x7F])+', ' ', aBuf)
		return aBuf

	def filter_without_english_letters(self, aBuf):
		aBuf = re.sub(r'([A-Za-z])+', ' ', aBuf)
		return aBuf

	def filter_with_english_letters(self, aBuf):
		# TODO
		return aBuf