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patch 9.1.0199: Not enough tests for the slice() function

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Problem:  Not enough tests for the slice() function.
Solution: Test with multibyte chars, and in both Legacy and Vim9 script.
          Update docs to be clearer about how it treats composing chars.
          (zeertzjq)

closes: #14275

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
zeertzjq
2024-03-23 08:23:48 +01:00
committed by Christian Brabandt
parent d990bf08d8
commit ad38769030
4 changed files with 59 additions and 25 deletions
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51
src/testdir/test_functions.vim
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@@ -3953,4 +3953,55 @@ func Test_glob_extended_mswin()
call delete('Xtestglob', 'rf')
endfunc
" Tests for the slice() function.
func Test_slice()
let lines =<< trim END
call assert_equal([1, 2, 3, 4, 5], slice(range(6), 1))
call assert_equal([2, 3, 4, 5], slice(range(6), 2))
call assert_equal([2, 3], slice(range(6), 2, 4))
call assert_equal([0, 1, 2, 3], slice(range(6), 0, 4))
call assert_equal([1, 2, 3], slice(range(6), 1, 4))
call assert_equal([1, 2, 3, 4], slice(range(6), 1, -1))
call assert_equal([1, 2], slice(range(6), 1, -3))
call assert_equal([1], slice(range(6), 1, -4))
call assert_equal([], slice(range(6), 1, -5))
call assert_equal([], slice(range(6), 1, -6))
call assert_equal(0z1122334455, slice(0z001122334455, 1))
call assert_equal(0z22334455, slice(0z001122334455, 2))
call assert_equal(0z2233, slice(0z001122334455, 2, 4))
call assert_equal(0z00112233, slice(0z001122334455, 0, 4))
call assert_equal(0z112233, slice(0z001122334455, 1, 4))
call assert_equal(0z11223344, slice(0z001122334455, 1, -1))
call assert_equal(0z1122, slice(0z001122334455, 1, -3))
call assert_equal(0z11, slice(0z001122334455, 1, -4))
call assert_equal(0z, slice(0z001122334455, 1, -5))
call assert_equal(0z, slice(0z001122334455, 1, -6))
call assert_equal('12345', slice('012345', 1))
call assert_equal('2345', slice('012345', 2))
call assert_equal('23', slice('012345', 2, 4))
call assert_equal('0123', slice('012345', 0, 4))
call assert_equal('123', slice('012345', 1, 4))
call assert_equal('1234', slice('012345', 1, -1))
call assert_equal('12', slice('012345', 1, -3))
call assert_equal('1', slice('012345', 1, -4))
call assert_equal('', slice('012345', 1, -5))
call assert_equal('', slice('012345', 1, -6))
#" Composing chars are treated as a part of the preceding base char.
call assert_equal('β̳́γ̳̂δ̳̃ε̳̄ζ̳̅', 'ὰ̳β̳́γ̳̂δ̳̃ε̳̄ζ̳̅'->slice(1))
call assert_equal('γ̳̂δ̳̃ε̳̄ζ̳̅', 'ὰ̳β̳́γ̳̂δ̳̃ε̳̄ζ̳̅'->slice(2))
call assert_equal('γ̳̂δ̳̃', 'ὰ̳β̳́γ̳̂δ̳̃ε̳̄ζ̳̅'->slice(2, 4))
call assert_equal('ὰ̳β̳́γ̳̂δ̳̃', 'ὰ̳β̳́γ̳̂δ̳̃ε̳̄ζ̳̅'->slice(0, 4))
call assert_equal('β̳́γ̳̂δ̳̃', 'ὰ̳β̳́γ̳̂δ̳̃ε̳̄ζ̳̅'->slice(1, 4))
call assert_equal('β̳́γ̳̂δ̳̃ε̳̄', 'ὰ̳β̳́γ̳̂δ̳̃ε̳̄ζ̳̅'->slice(1, -1))
call assert_equal('β̳́γ̳̂', 'ὰ̳β̳́γ̳̂δ̳̃ε̳̄ζ̳̅'->slice(1, -3))
call assert_equal('β̳́', 'ὰ̳β̳́γ̳̂δ̳̃ε̳̄ζ̳̅'->slice(1, -4))
call assert_equal('', 'ὰ̳β̳́γ̳̂δ̳̃ε̳̄ζ̳̅'->slice(1, -5))
call assert_equal('', 'ὰ̳β̳́γ̳̂δ̳̃ε̳̄ζ̳̅'->slice(1, -6))
END
call v9.CheckLegacyAndVim9Success(lines)
endfunc
" vim: shiftwidth=2 sts=2 expandtab