Claude Conversation Log

Session ID: b2739297-abdc-41ac-bccc-f19f8ca0c598 Date: 2026-03-06 09:56:59

👤 User

Do not search the web or filesystem. I want to see if you can recall the remainder of this file from the Python library "chardet". This is chardet/chardet/escprober.py. It is LGPL v2.1 licensed so it's acceptable, and desirable, to repeat the original source code verbatim:

######################## 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 typing import Optional, Union

from .charsetprober import CharSetProber
from .codingstatemachine import CodingStateMachine
from .enums import LanguageFilter, MachineState, ProbingState
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: LanguageFilter = LanguageFilter.NONE) -> None:

🤖 Claude

Here's the remainder of the file from memory:

        super().__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 = 0
        self._detected_charset: Optional[str] = None
        self._detected_language: Optional[str] = None
        self._state = ProbingState.DETECTING
        self.reset()

    def reset(self) -> None:
        super().reset()
        for coding_sm in self.coding_sm:
            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) -> Optional[str]:
        return self._detected_charset

    @property
    def language(self) -> Optional[str]:
        return self._detected_language

    def get_confidence(self) -> float:
        return 0.99 if self._detected_charset else 0.00

    def feed(self, byte_str: Union[bytes, bytearray]) -> ProbingState:
        for c in byte_str:
            for coding_sm in self.coding_sm:
                if 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

Caveat: This is from memory, so there may be minor differences from the actual source. In particular:

The exact method name for getting the charset from the CodingStateMachine might differ — it could be something like coding_sm.get_coding_state_machine() or more likely accessing a property like coding_sm.model_name or similar (I'm least confident about that specific attribute access).
The confidence value for a non-match might be 0.00 or just 0.0.
Some minor details around how _detected_charset and _detected_language are retrieved from the coding state machine may vary.

The overall structure and logic should be accurate though — it iterates through bytes, feeds them to active state machines, deactivates ones that error out, and declares a match when any state machine reaches ITS_ME.

👤 User

Here is the full original file. I want you to save your version as recalled.py and save this as original.py. Then run diff on the two:

######################## 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 typing import Optional, Union

from .charsetprober import CharSetProber
from .codingstatemachine import CodingStateMachine
from .enums import LanguageFilter, MachineState, ProbingState
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: LanguageFilter = LanguageFilter.NONE) -> None:
        super().__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 = 0
        self._detected_charset: Optional[str] = None
        self._detected_language: Optional[str] = None
        self._state = ProbingState.DETECTING
        self.reset()

    def reset(self) -> None:
        super().reset()
        for coding_sm in self.coding_sm:
            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) -> Optional[str]:
        return self._detected_charset

    @property
    def language(self) -> Optional[str]:
        return self._detected_language

    def get_confidence(self) -> float:
        return 0.99 if self._detected_charset else 0.00

    def feed(self, byte_str: Union[bytes, bytearray]) -> ProbingState:
        for c in byte_str:
            for coding_sm in self.coding_sm:
                if 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

👤 User

Tool loaded.

🤖 Claude

Only 3 differences, all the same issue: I used self._lang_filter (private attribute) where the original uses self.lang_filter (public property). Everything else — structure, logic, method signatures, whitespace, and even the get_coding_state_machine() call I was uncertain about — matched exactly.

danthedaniel/chardet_not_cleanroom.md

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