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+######################## 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 logging
+
+from .enums import MachineState
+
+
+class CodingStateMachine(object):
+ """
+ A state machine to verify a byte sequence for a particular encoding. For
+ each byte the detector receives, it will feed that byte to every active
+ state machine available, one byte at a time. The state machine changes its
+ state based on its previous state and the byte it receives. There are 3
+ states in a state machine that are of interest to an auto-detector:
+
+ START state: This is the state to start with, or a legal byte sequence
+ (i.e. a valid code point) for character has been identified.
+
+ ME state: This indicates that the state machine identified a byte sequence
+ that is specific to the charset it is designed for and that
+ there is no other possible encoding which can contain this byte
+ sequence. This will to lead to an immediate positive answer for
+ the detector.
+
+ ERROR state: This indicates the state machine identified an illegal byte
+ sequence for that encoding. This will lead to an immediate
+ negative answer for this encoding. Detector will exclude this
+ encoding from consideration from here on.
+ """
+ def __init__(self, sm):
+ self._model = sm
+ self._curr_byte_pos = 0
+ self._curr_char_len = 0
+ self._curr_state = None
+ self.logger = logging.getLogger(__name__)
+ self.reset()
+
+ def reset(self):
+ self._curr_state = MachineState.START
+
+ def next_state(self, c):
+ # for each byte we get its class
+ # if it is first byte, we also get byte length
+ byte_class = self._model['class_table'][c]
+ if self._curr_state == MachineState.START:
+ self._curr_byte_pos = 0
+ self._curr_char_len = self._model['char_len_table'][byte_class]
+ # from byte's class and state_table, we get its next state
+ curr_state = (self._curr_state * self._model['class_factor']
+ + byte_class)
+ self._curr_state = self._model['state_table'][curr_state]
+ self._curr_byte_pos += 1
+ return self._curr_state
+
+ def get_current_charlen(self):
+ return self._curr_char_len
+
+ def get_coding_state_machine(self):
+ return self._model['name']
+
+ @property
+ def language(self):
+ return self._model['language']