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Krzysztof kuhy Rudnicki
b70730fc7a
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
102 lines
3.2 KiB
Python
102 lines
3.2 KiB
Python
# Copyright (c) 2026 Krzysztof Rudnicki. MIT licence.
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"""Folding a typed command down to a comparable skeleton.
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Every non-ASCII literal here is an escape. These tests exist because two
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characters looked identical, so a reader must be able to see which codepoint
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each case actually means.
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"""
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from __future__ import annotations
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import pytest
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from signal_bot.folding import TABLE, fold
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# The regression itself: `!gecko` as it arrives from a Russian keyboard, with
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# U+0435 for the `e` and U+043E for the `o`.
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RUSSIAN_GECKO = "!g\u0435ck\u043e"
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def test_the_cyrillic_gecko_that_started_this() -> None:
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assert fold(RUSSIAN_GECKO) == "!gecko"
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assert RUSSIAN_GECKO != "!gecko"
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@pytest.mark.parametrize(
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("typed", "expected"),
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[
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# Cyrillic
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("!\u043a\u043e\u0442", "!kot"),
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("!\u0441\u0430\u0442", "!cat"),
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("!d\u043eg", "!dog"),
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# Greek
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("!d\u03bfg", "!dog"),
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("!\u03bau\u03bf\u03c4", "!kuot"),
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# Latin small capitals
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("!\u1d0b\u1d0f\u1d1b", "!kot"),
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# Latin letters that are not ASCII
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("!d\u00f8g", "!dog"),
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("!p\u0131es", "!pies"),
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# Leetspeak
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("!g3ck0", "!gecko"),
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("!d0g", "!dog"),
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("!c4t", "!cat"),
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("!p13s", "!pies"),
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("!5zczek", "!szczek"),
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("!ca7", "!cat"),
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# Compatibility forms NFKC already handles
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("!\uff44\uff4f\uff47", "!dog"),
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("!\U0001d5f8\U0001d5fc\U0001d601", "!kot"),
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# Diacritics decompose away
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("!papie\u017c", "!papiez"),
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("!k\u00f3t", "!kot"),
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# Invisible characters are dropped
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("!d\u200bog", "!dog"),
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("!d\u200dog", "!dog"),
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("!dog\u00ad", "!dog"),
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("!\ufeffdog", "!dog"),
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# Case and surrounding whitespace
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(" !DOG ", "!dog"),
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("!Dog", "!dog"),
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(" !dog ", "!dog"),
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],
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)
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def test_fold_maps_lookalikes_onto_ascii(typed: str, expected: str) -> None:
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assert fold(typed) == expected
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def test_fold_keeps_internal_whitespace() -> None:
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"""Argument support (0.0.6) splits on it, so folding must not eat it."""
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assert fold("!suggest !gecko co ma robic") == "!suggest !gecko co ma robic"
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def test_fold_leaves_ordinary_text_alone() -> None:
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assert fold("!dog") == "!dog"
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assert fold("hello there") == "hello there"
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assert fold("") == ""
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def test_fold_is_idempotent() -> None:
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"""Folding twice must equal folding once, or triggers drift from input."""
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for typed in (RUSSIAN_GECKO, "!g3ck0", "!\u1d0b\u1d0f\u1d1b", "!papie\u017c"):
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assert fold(fold(typed)) == fold(typed)
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def test_fold_does_not_collapse_genuinely_different_commands() -> None:
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"""The table must not be so eager that distinct commands become one."""
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assert fold("!cat") != fold("!dog")
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assert fold("!kot") != fold("!kots")
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assert fold("!gekon") != fold("!geko")
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def test_every_mapping_target_is_ascii() -> None:
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"""A mapping onto another non-ASCII character would need folding again."""
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for replacement in TABLE.values():
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assert replacement.isascii()
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def test_table_covers_both_alphabets_that_bit_us() -> None:
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assert TABLE[0x043E] == "o"
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assert TABLE[0x0435] == "e"
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assert TABLE[0x03BF] == "o"
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