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vim-patch:8.2.2318: Vim9: string and list index work differently

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Problem:    Vim9: string and list index work differently.
Solution:   Make string index work like list index. (closes vim/vim#7643)

e7525c5520

Co-authored-by: Bram Moolenaar <Bram@vim.org>
This commit is contained in:
zeertzjq 2024-03-23 08:01:43 +08:00
parent a44ac26c75
commit e4a23b6e0b
2 changed files with 19 additions and 5 deletions
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22
src/nvim/eval.c
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@ -7523,16 +7523,30 @@ int check_luafunc_name(const char *const str, const bool paren)
/// "index" is out of range NULL is returned.
char *char_from_string(const char *str, varnumber_T index)
{
size_t nbyte = 0;
varnumber_T nchar = index;
if (str == NULL || index < 0) {
if (str == NULL) {
return NULL;
}
size_t slen = strlen(str);
while (nchar > 0 && nbyte < slen) {
// do the same as for a list: a negative index counts from the end
if (index < 0) {
int clen = 0;
for (size_t nbyte = 0; nbyte < slen; clen++) {
nbyte += (size_t)utf_ptr2len(str + nbyte);
}
nchar = clen + index;
if (nchar < 0) {
// unlike list: index out of range results in empty string
return NULL;
}
}
size_t nbyte = 0;
for (; nchar > 0 && nbyte < slen; nchar--) {
nbyte += (size_t)utf_ptr2len(str + nbyte);
nchar--;
}
if (nbyte >= slen) {
return NULL;

2
src/nvim/eval/typval.c
View File

@ -859,7 +859,7 @@ int tv_list_slice_or_index(list_T *list, bool range, varnumber_T n1_arg, varnumb
// A list index out of range is an error.
if (!range) {
if (verbose) {
semsg(_(e_list_index_out_of_range_nr), (int64_t)n1);
semsg(_(e_list_index_out_of_range_nr), (int64_t)n1_arg);
}
return FAIL;
}