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# coding: utf-8
# Modified Work: Copyright (c) 2018, 2020, Oracle and/or its affiliates. All rights reserved.
# Original Work: Copyright (c) 2018 Character Encoding Detector contributors. https://github.com/chardet
from .charsetprober import CharSetProber
from .codingstatemachine import CodingStateMachine
from .enums import LanguageFilter, ProbingState, MachineState
from .escsm import (HZ_SM_MODEL, ISO2022CN_SM_MODEL, ISO2022JP_SM_MODEL,
ISO2022KR_SM_MODEL)
class EscCharSetProber(CharSetProber):
"""
This CharSetProber uses a "code scheme" approach for detecting encodings,
whereby easily recognizable escape or shift sequences are relied on to
identify these encodings.
"""
def __init__(self, lang_filter=None):
super(EscCharSetProber, self).__init__(lang_filter=lang_filter)
self.coding_sm = []
if self.lang_filter & LanguageFilter.CHINESE_SIMPLIFIED:
self.coding_sm.append(CodingStateMachine(HZ_SM_MODEL))
self.coding_sm.append(CodingStateMachine(ISO2022CN_SM_MODEL))
if self.lang_filter & LanguageFilter.JAPANESE:
self.coding_sm.append(CodingStateMachine(ISO2022JP_SM_MODEL))
if self.lang_filter & LanguageFilter.KOREAN:
self.coding_sm.append(CodingStateMachine(ISO2022KR_SM_MODEL))
self.active_sm_count = None
self._detected_charset = None
self._detected_language = None
self._state = None
self.reset()
def reset(self):
super(EscCharSetProber, self).reset()
for coding_sm in self.coding_sm:
if not coding_sm:
continue
coding_sm.active = True
coding_sm.reset()
self.active_sm_count = len(self.coding_sm)
self._detected_charset = None
self._detected_language = None
@property
def charset_name(self):
return self._detected_charset
@property
def language(self):
return self._detected_language
def get_confidence(self):
if self._detected_charset:
return 0.99
else:
return 0.00
def feed(self, byte_str):
for c in byte_str:
for coding_sm in self.coding_sm:
if not coding_sm or not coding_sm.active:
continue
coding_state = coding_sm.next_state(c)
if coding_state == MachineState.ERROR:
coding_sm.active = False
self.active_sm_count -= 1
if self.active_sm_count <= 0:
self._state = ProbingState.NOT_ME
return self.state
elif coding_state == MachineState.ITS_ME:
self._state = ProbingState.FOUND_IT
self._detected_charset = coding_sm.get_coding_state_machine()
self._detected_language = coding_sm.language
return self.state
return self.state