######################## BEGIN LICENSE BLOCK ########################
# The Original Code is mozilla.org code.
#
# The Initial Developer of the Original Code is
# Netscape Communications Corporation.
# Portions created by the Initial Developer are Copyright (C) 1998
# the Initial Developer. All Rights Reserved.
#
# Contributor(s):
#   Mark Pilgrim - port to Python
#
# 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, sys
from escsm import HZSMModel, ISO2022CNSMModel, ISO2022JPSMModel, ISO2022KRSMModel
from charsetprober import CharSetProber
from codingstatemachine import CodingStateMachine

class EscCharSetProber(CharSetProber):
	def __init__(self):
		CharSetProber.__init__(self)
		self._mCodingSM = [ \
			CodingStateMachine(HZSMModel),
			CodingStateMachine(ISO2022CNSMModel),
			CodingStateMachine(ISO2022JPSMModel),
			CodingStateMachine(ISO2022KRSMModel)
			]
		self.reset()

	def reset(self):
		CharSetProber.reset(self)
		for codingSM in self._mCodingSM:
			if not codingSM: continue
			codingSM.active = constants.True
			codingSM.reset()
		self._mActiveSM = len(self._mCodingSM)
		self._mDetectedCharset = None

	def get_charset_name(self):
		return self._mDetectedCharset

	def get_confidence(self):
		if self._mDetectedCharset:
			return 0.99
		else:
			return 0.00

	def feed(self, aBuf):
		for c in aBuf:
			for codingSM in self._mCodingSM:
				if not codingSM: continue
				if not codingSM.active: continue
				codingState = codingSM.next_state(c)
				if codingState == constants.eError:
					codingSM.active = constants.False
					self._mActiveSM -= 1
					if self._mActiveSM <= 0:
						self._mState = constants.eNotMe
						return self.get_state()
				elif codingState == constants.eItsMe:
					self._mState = constants.eFoundIt
					self._mDetectedCharset = codingSM.get_coding_state_machine()
					return self.get_state()

		return self.get_state()