bit_ignore: Gitignore character classes and escaped wildcards do not match

[Milky2018]

Summary

mizchi/bit_ignore 0.48.0 treats Gitignore character classes and general backslash escapes as literal pattern characters. As a result, valid rules such as [ab].txt and file\?.txt fail to match the intended paths.

Both cases reproduce with the published package. I also checked current main at 2681c3bc815d01aa56e678f45eb98e268c052481; the relevant matcher still has the same behavior.

Minimal reproduction

Create these three files in an empty directory, then run moon test --target native.

moon.mod

name = "repro/bit-ignore"
version = "0.0.0"
import {
  "mizchi/bit_ignore@0.48.0",
}

moon.pkg

import {
  "mizchi/bit_ignore" @ignore,
} for "wbtest"

repro_wbtest.mbt

///|
test "character class" {
  let matcher = @ignore.Matcher::new()
  matcher.add_rules("", "[ab].txt\n")
  assert_true(matcher.is_ignored("a.txt", false))
}

///|
test "escaped wildcard" {
  let matcher = @ignore.Matcher::new()
  matcher.add_rules("", "file\\?.txt\n")
  assert_true(matcher.is_ignored("file?.txt", false))
}

Both assertions fail because is_ignored returns false. Expected: both return true.

Git confirms the expected matches. With this .gitignore:

[ab].txt
file\?.txt

git check-ignore --no-index -v -- a.txt 'file?.txt' reports both rules as matching (the paths do not need to exist).

Cause and impact

match_glob_precompiled_range only distinguishes literal equality, ?, and *. Character classes/ranges/negated classes and escaped metacharacters therefore do not have Gitignore semantics.

This affects consumers using the library to decide which files to ignore or copy without rendering. For example, a class-based exclusion may unexpectedly leave a binary file selected for text processing.

Could the matcher support Gitignore character classes and backslash escapes, with regressions covering [ab], [0-9], [!0-9], \?, \*, and escaped brackets? Until then, documenting the unsupported syntax would also help library consumers.

Environment

• Published package: mizchi/bit_ignore@0.48.0
• Reproduced on macOS, native backend
• moon 0.1.20260920 (914d7da)
• moonc v0.10.14+7d59c7ec9