|
1 ######################## BEGIN LICENSE BLOCK ######################## |
|
2 # The Original Code is mozilla.org code. |
|
3 # |
|
4 # The Initial Developer of the Original Code is |
|
5 # Netscape Communications Corporation. |
|
6 # Portions created by the Initial Developer are Copyright (C) 1998 |
|
7 # the Initial Developer. All Rights Reserved. |
|
8 # |
|
9 # Contributor(s): |
|
10 # Mark Pilgrim - port to Python |
|
11 # |
|
12 # This library is free software; you can redistribute it and/or |
|
13 # modify it under the terms of the GNU Lesser General Public |
|
14 # License as published by the Free Software Foundation; either |
|
15 # version 2.1 of the License, or (at your option) any later version. |
|
16 # |
|
17 # This library is distributed in the hope that it will be useful, |
|
18 # but WITHOUT ANY WARRANTY; without even the implied warranty of |
|
19 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|
20 # Lesser General Public License for more details. |
|
21 # |
|
22 # You should have received a copy of the GNU Lesser General Public |
|
23 # License along with this library; if not, write to the Free Software |
|
24 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA |
|
25 # 02110-1301 USA |
|
26 ######################### END LICENSE BLOCK ######################### |
|
27 |
|
28 from constants import eStart, eError, eItsMe |
|
29 |
|
30 class CodingStateMachine: |
|
31 def __init__(self, sm): |
|
32 self._mModel = sm |
|
33 self._mCurrentBytePos = 0 |
|
34 self._mCurrentCharLen = 0 |
|
35 self.reset() |
|
36 |
|
37 def reset(self): |
|
38 self._mCurrentState = eStart |
|
39 |
|
40 def next_state(self, c): |
|
41 # for each byte we get its class |
|
42 # if it is first byte, we also get byte length |
|
43 byteCls = self._mModel['classTable'][ord(c)] |
|
44 if self._mCurrentState == eStart: |
|
45 self._mCurrentBytePos = 0 |
|
46 self._mCurrentCharLen = self._mModel['charLenTable'][byteCls] |
|
47 # from byte's class and stateTable, we get its next state |
|
48 self._mCurrentState = self._mModel['stateTable'][self._mCurrentState * self._mModel['classFactor'] + byteCls] |
|
49 self._mCurrentBytePos += 1 |
|
50 return self._mCurrentState |
|
51 |
|
52 def get_current_charlen(self): |
|
53 return self._mCurrentCharLen |
|
54 |
|
55 def get_coding_state_machine(self): |
|
56 return self._mModel['name'] |