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from __future__ import annotations
import itertools
import operator
from typing import TYPE_CHECKING
from sphinx._cli.util.colour import blue, reset
from sphinx._cli.util.errors import strip_escape_sequences
if TYPE_CHECKING:
from collections.abc import Sequence
from typing import Final
CURSOR_UP: Final[str] = '\x1b[2A' # ignored ANSI code
ERASE_LINE: Final[str] = '\x1b[2K' # supported ANSI code
TEXT: Final[str] = '\x07 ß Hello world!'
def test_strip_escape_sequences() -> None:
# double ERASE_LINE so that the tested strings may have 2 of them
ansi_base_blocks = [
TEXT,
blue(TEXT),
reset(TEXT),
ERASE_LINE,
ERASE_LINE,
CURSOR_UP,
]
# :func:`strip_escape_sequences` strips ANSI codes known by Sphinx
text_base_blocks = [
TEXT,
TEXT,
TEXT,
'',
'',
CURSOR_UP,
]
assert len(text_base_blocks) == len(ansi_base_blocks)
N = len(ansi_base_blocks)
def next_ansi_blocks(choices: Sequence[str], n: int) -> Sequence[str]:
# Get a list of *n* words from a cyclic sequence of *choices*.
#
# For instance ``next_ansi_blocks(['a', 'b'], 3) == ['a', 'b', 'a']``.
stream = itertools.cycle(choices)
return list(map(operator.itemgetter(0), zip(stream, range(n), strict=False)))
# generate all permutations of length N
for sigma in itertools.permutations(range(N), N):
# apply the permutation on the blocks with ANSI codes
ansi_blocks = list(map(ansi_base_blocks.__getitem__, sigma))
# apply the permutation on the blocks with stripped codes
text_blocks = list(map(text_base_blocks.__getitem__, sigma))
for glue, n in itertools.product(['.', '\n', '\r\n'], range(4 * N)):
ansi_strings = next_ansi_blocks(ansi_blocks, n)
text_strings = next_ansi_blocks(text_blocks, n)
assert len(ansi_strings) == len(text_strings) == n
ansi_string = glue.join(ansi_strings)
text_string = glue.join(text_strings)
assert strip_escape_sequences(ansi_string) == text_string
def test_strip_ansi_short_forms() -> None:
# In Sphinx, we always "normalize" the color codes so that they
# match "\x1b\[(\d\d;){0,2}(\d\d)m" but it might happen that
# some messages use '\x1b[0m' instead of ``reset(s)``, so we
# test whether this alternative form is supported or not.
for strip_function in strip_escape_sequences, strip_escape_sequences:
# \x1b[m and \x1b[0m are equivalent to \x1b[00m
assert strip_function('\x1b[m') == ''
assert strip_function('\x1b[0m') == ''
# \x1b[1m is equivalent to \x1b[01m
assert strip_function('\x1b[1mbold\x1b[0m') == 'bold'
# \x1b[K is equivalent to \x1b[0K
assert strip_escape_sequences('\x1b[K') == ''
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