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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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11
runtime/doc/builtin.txt
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@ -1,4 +1,4 @@
*builtin.txt* For Vim version 9.1. Last change: 2024 Mar 14
*builtin.txt* For Vim version 9.1. Last change: 2024 Mar 23
VIM REFERENCE MANUAL by Bram Moolenaar
@ -9068,7 +9068,8 @@ slice({expr}, {start} [, {end}]) *slice()*
Similar to using a |slice| "expr[start : end]", but "end" is
used exclusive. And for a string the indexes are used as
character indexes instead of byte indexes, like in
|vim9script|. Also, composing characters are not counted.
|vim9script|. Also, composing characters are treated as a
part of the preceding base character.
When {end} is omitted the slice continues to the last item.
When {end} is -1 the last item is omitted.
Returns an empty value if {start} or {end} are invalid.
@ -9465,8 +9466,8 @@ strcharpart({src}, {start} [, {len} [, {skipcc}]]) *strcharpart()*
of byte index and length.
When {skipcc} is omitted or zero, composing characters are
counted separately.
When {skipcc} set to 1, Composing characters are ignored,
similar to |slice()|.
When {skipcc} set to 1, composing characters are treated as a
part of the preceding base character, similar to |slice()|.
When a character index is used where a character does not
exist it is omitted and counted as one character. For
example: >
@ -9484,7 +9485,7 @@ strchars({string} [, {skipcc}]) *strchars()*
in String {string}.
When {skipcc} is omitted or zero, composing characters are
counted separately.
When {skipcc} set to 1, Composing characters are ignored.
When {skipcc} set to 1, composing characters are ignored.
|strcharlen()| always does this.
Returns zero on error.