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patch 8.2.2233: cannot convert a byte index into a character index

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Problem:    Cannot convert a byte index into a character index.
Solution:   Add charidx(). (Yegappan Lakshmanan, closes #7561)
This commit is contained in:
Bram Moolenaar
2020-12-28 12:56:58 +01:00
parent 9618a25b9c
commit 17793ef23a
5 changed files with 109 additions and 0 deletions
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25
src/testdir/test_functions.vim
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@@ -1132,6 +1132,31 @@ func Test_byteidx()
call assert_fails("call byteidxcomp([], 0)", 'E730:')
endfunc
" Test for charidx()
func Test_charidx()
let a = 'xáb́y'
call assert_equal(0, charidx(a, 0))
call assert_equal(1, charidx(a, 3))
call assert_equal(2, charidx(a, 4))
call assert_equal(3, charidx(a, 7))
call assert_equal(-1, charidx(a, 8))
call assert_equal(-1, charidx('', 0))
" count composing characters
call assert_equal(0, charidx(a, 0, 1))
call assert_equal(2, charidx(a, 2, 1))
call assert_equal(3, charidx(a, 4, 1))
call assert_equal(5, charidx(a, 7, 1))
call assert_equal(-1, charidx(a, 8, 1))
call assert_equal(-1, charidx('', 0, 1))
call assert_fails('let x = charidx([], 1)', 'E474:')
call assert_fails('let x = charidx("abc", [])', 'E474:')
call assert_fails('let x = charidx("abc", 1, [])', 'E474:')
call assert_fails('let x = charidx("abc", 1, -1)', 'E1023:')
call assert_fails('let x = charidx("abc", 1, 2)', 'E1023:')
endfunc
func Test_count()
let l = ['a', 'a', 'A', 'b']
call assert_equal(2, count(l, 'a'))