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vim-patch:8.2.1794: no falsy Coalescing operator

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Problem:    No falsy Coalescing operator.
Solution:   Add the "??" operator.  Fix mistake with function argument count.

92f26c256e

Cherry-pick tv2bool() into eval/typval.c.
Cherry-pick *??* tag from Vim runtime.

Co-authored-by: Bram Moolenaar <Bram@vim.org>
This commit is contained in:
zeertzjq
2023-04-14 11:00:17 +08:00
parent 7caf0eafd8
commit d6e2804ab4
5 changed files with 137 additions and 31 deletions
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31
src/nvim/eval/typval.c
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@@ -4201,3 +4201,34 @@ const char *tv_get_string_buf(const typval_T *const tv, char *const buf)
return res != NULL ? res : "";
}
/// Return true when "tv" is not falsy: non-zero, non-empty string, non-empty
/// list, etc. Mostly like what JavaScript does, except that empty list and
/// empty dictionary are false.
bool tv2bool(const typval_T *const tv)
{
switch (tv->v_type) {
case VAR_NUMBER:
return tv->vval.v_number != 0;
case VAR_FLOAT:
return tv->vval.v_float != 0.0;
case VAR_PARTIAL:
return tv->vval.v_partial != NULL;
case VAR_FUNC:
case VAR_STRING:
return tv->vval.v_string != NULL && *tv->vval.v_string != NUL;
case VAR_LIST:
return tv->vval.v_list != NULL && tv->vval.v_list->lv_len > 0;
case VAR_DICT:
return tv->vval.v_dict != NULL && tv->vval.v_dict->dv_hashtab.ht_used > 0;
case VAR_BOOL:
return tv->vval.v_bool == kBoolVarTrue;
case VAR_SPECIAL:
return tv->vval.v_special == kSpecialVarNull;
case VAR_BLOB:
return tv->vval.v_blob != NULL && tv->vval.v_blob->bv_ga.ga_len > 0;
case VAR_UNKNOWN:
break;
}
return false;
}