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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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10
src/structs.h
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@@ -1468,6 +1468,7 @@ typedef struct ectx_S ectx_T;
typedef struct instr_S instr_T;
typedef struct class_S class_T;
typedef struct object_S object_T;
typedef struct typealias_S typealias_T;
typedef enum
{
@@ -1489,6 +1490,7 @@ typedef enum
VAR_INSTR, // "v_instr" is used
VAR_CLASS, // "v_class" is used (also used for interface)
VAR_OBJECT, // "v_object" is used
VAR_TYPEALIAS // "v_typealias" is used
} vartype_T;
// A type specification.
@@ -1602,6 +1604,13 @@ struct object_S
int obj_copyID; // used by garbage collection
};
struct typealias_S
{
int ta_refcount;
type_T *ta_type;
char_u *ta_name;
};
/*
* Structure to hold an internal variable without a name.
*/
@@ -1625,6 +1634,7 @@ struct typval_S
instr_T *v_instr; // instructions to execute
class_T *v_class; // class value (can be NULL)
object_T *v_object; // object value (can be NULL)
typealias_T *v_typealias; // user-defined type name
} vval;
};