######################## 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 #########################

from constants import eStart, eError, eItsMe

class CodingStateMachine:
	def __init__(self, sm):
		self._mModel = sm
		self._mCurrentBytePos = 0
		self._mCurrentCharLen = 0
		self.reset()

	def reset(self):
		self._mCurrentState = eStart

	def next_state(self, c):
		# for each byte we get its class
		# if it is first byte, we also get byte length
		byteCls = self._mModel['classTable'][ord(c)]
		if self._mCurrentState == eStart:
			self._mCurrentBytePos = 0
			self._mCurrentCharLen = self._mModel['charLenTable'][byteCls]
		# from byte's class and stateTable, we get its next state
		self._mCurrentState = self._mModel['stateTable'][self._mCurrentState * self._mModel['classFactor'] + byteCls]
		self._mCurrentBytePos += 1
		return self._mCurrentState

	def get_current_charlen(self):
		return self._mCurrentCharLen

	def get_coding_state_machine(self):
		return self._mModel['name']