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patch 9.1.0148: Vim9: can't call internal methods with objects

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Problem:  Vim9: can't call internal methods with objects
Solution: Add support for empty(), len() and string() function
          calls for objects (Yegappan Lakshmanan)

closes: #14129

Signed-off-by: Yegappan Lakshmanan <yegappan@yahoo.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
Yegappan Lakshmanan
2024-03-03 16:26:58 +01:00
committed by Christian Brabandt
parent 2157035637
commit d3eae7bc11
16 changed files with 1083 additions and 83 deletions
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28
runtime/doc/vim9class.txt
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@ -1,4 +1,4 @@
*vim9class.txt* For Vim version 9.1. Last change: 2024 Jan 12
*vim9class.txt* For Vim version 9.1. Last change: 2024 Mar 03
VIM REFERENCE MANUAL by Bram Moolenaar
@ -710,6 +710,32 @@ The initialization isn't needed, the list is empty by default.
*E1330*
Some types cannot be used, such as "void", "null" and "v:none".
Builtin Object Methods ~
*builtin-object-methods*
Some of the builtin functions like |empty()|, |len()| and |string()| can be
used with an object. An object can implement a method with the same name as
these builtin functions to return an object-specific value.
*E1412*
The following builtin methods are supported:
*object-empty()*
empty() Invoked by the |empty()| function to check whether an object is
empty. If this method is missing, then true is returned. This
method should not accept any arguments and must return a boolean.
*object-len()*
len() Invoked by the |len()| function to return the length of an
object. If this method is missing in the class, then an error is
given and zero is returned. This method should not accept any
arguments and must return a number.
*object-string()*
string() Invoked by the |string()| function to get a textual
representation of an object. Also used by the |:echo| command
for an object. If this method is missing in the class, then a
built-in default textual representation is used. This method
should not accept any arguments and must return a string.
*E1413*
A class method cannot be used as a builtin method.
Defining an interface ~
*Interface* *:interface* *:endinterface*