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patch 9.0.2076: Vim9: No support for type aliases

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Problem:  Vim9: No support for type aliases
Solution: Implement :type command

A type definition is giving a name to a type specification.  This also known
type alias.

	:type ListOfStrings = list<string>

The type alias can be used wherever a built-in type can be used.  The type
alias name must start with an upper case character.

closes: #13407

Signed-off-by: Christian Brabandt <cb@256bit.org>
Signed-off-by: Yegappan Lakshmanan <yegappan@yahoo.com>
This commit is contained in:
Yegappan Lakshmanan
2023-10-27 19:35:26 +02:00
committed by Christian Brabandt
parent 4bca4897a1
commit ec3cebbd2b
22 changed files with 710 additions and 36 deletions
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20
src/eval.c
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@@ -1883,6 +1883,14 @@ set_var_lval(
if (eval_variable(lp->ll_name, (int)STRLEN(lp->ll_name),
lp->ll_sid, &tv, &di, EVAL_VAR_VERBOSE) == OK)
{
if (di != NULL && di->di_tv.v_type == VAR_TYPEALIAS)
{
semsg(_(e_using_typealias_as_variable),
di->di_tv.vval.v_typealias->ta_name);
clear_tv(&tv);
return;
}
if ((di == NULL
|| (!var_check_ro(di->di_flags, lp->ll_name, FALSE)
&& !tv_check_lock(&di->di_tv, lp->ll_name, FALSE)))
@@ -2013,6 +2021,7 @@ tv_op(typval_T *tv1, typval_T *tv2, char_u *op)
case VAR_INSTR:
case VAR_CLASS:
case VAR_OBJECT:
case VAR_TYPEALIAS:
break;
case VAR_BLOB:
@@ -5004,6 +5013,7 @@ check_can_index(typval_T *rettv, int evaluate, int verbose)
case VAR_INSTR:
case VAR_CLASS:
case VAR_OBJECT:
case VAR_TYPEALIAS:
if (verbose)
emsg(_(e_cannot_index_special_variable));
return FAIL;
@@ -5109,6 +5119,7 @@ eval_index_inner(
case VAR_INSTR:
case VAR_CLASS:
case VAR_OBJECT:
case VAR_TYPEALIAS:
break; // not evaluating, skipping over subscript
case VAR_NUMBER:
@@ -6046,6 +6057,7 @@ set_ref_in_item(
case VAR_FLOAT:
case VAR_STRING:
case VAR_BLOB:
case VAR_TYPEALIAS:
case VAR_INSTR:
// Types that do not contain any other item
break;
@@ -6329,6 +6341,13 @@ echo_string_core(
*tofree = NULL;
r = (char_u *)get_var_special_name(tv->vval.v_number);
break;
case VAR_TYPEALIAS:
*tofree = vim_strsave(tv->vval.v_typealias->ta_name);
r = *tofree;
if (r == NULL)
r = (char_u *)"";
break;
}
if (--recurse == 0)
@@ -7201,6 +7220,7 @@ item_copy(
case VAR_INSTR:
case VAR_CLASS:
case VAR_OBJECT:
case VAR_TYPEALIAS:
copy_tv(from, to);
break;
case VAR_LIST: