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runtime(doc): Fill in a few details regarding :enums (#14349)

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- Mention the support of eval() for enumeration values.

- Clarify the extent of immutability for enumeration values.

- Specify the requirements for class methods to meet for
  class variable initialisation and their use in nested
  functions and lambda expressions.

- Remove a duplicate sentence that describes how to access
  parent class methods in derivative classes (see another
  "copy" two paragraphs below).


Signed-off-by: Aliaksei Budavei <0x000c70@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
Aliaksei Budavei
2024-04-04 23:05:33 +03:00
committed by GitHub
parent 408281e16a
commit 9574022580
2 changed files with 27 additions and 9 deletions
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5
runtime/doc/builtin.txt
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@ -1,4 +1,4 @@
*builtin.txt* For Vim version 9.1. Last change: 2024 Mar 29
*builtin.txt* For Vim version 9.1. Last change: 2024 Apr 03
VIM REFERENCE MANUAL by Bram Moolenaar
@ -2307,7 +2307,8 @@ eval({string}) Evaluate {string} and return the result. Especially useful to
turn the result of |string()| back into the original value.
This works for Numbers, Floats, Strings, Blobs and composites
of them. Also works for |Funcref|s that refer to existing
functions.
functions. In |Vim9| script, it can be used to obtain |enum|
values from their fully qualified names.
Can also be used as a |method|: >
argv->join()->eval()

31
runtime/doc/vim9class.txt
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@ -1,4 +1,4 @@
*vim9class.txt* For Vim version 9.1. Last change: 2024 Mar 28
*vim9class.txt* For Vim version 9.1. Last change: 2024 Apr 04
VIM REFERENCE MANUAL by Bram Moolenaar
@ -328,10 +328,27 @@ variables but they have no access to the object variables, they cannot use the
enddef
endclass
Inside the class the class method can be called by name directly, outside the
class the class name must be prefixed: `OtherThing.ClearTotalSize()`. To use
a class method from a parent class in a child class, the class name must be
prefixed.
Inside the class, the class method can be called by name directly, outside the
class, the class name must be prefixed: `OtherThing.ClearTotalSize()`. Also,
the name prefix must be used for public class methods in the special contexts
of class variable initializers and of lambda expressions and nested functions:
>
class OtherThing
static var name: string = OtherThing.GiveName()
static def GiveName(): string
def DoGiveName(): string
return OtherThing.NameAny()
enddef
return DoGiveName()
enddef
static def NameAny(): string
return "any"
enddef
endclass
<
Just like object methods the access can be made protected by using an
underscore as the first character in the method name: >
@ -972,8 +989,8 @@ The following example shows an enum with object variables and methods: >
echo Planet.Earth.has_rings
<
*E1421* *E1423* *E1424* *E1425*
Enums and their values are immutable. They cannot be modified after
declaration and cannot be utilized as numerical or string types.
Enums and their values are immutable. They cannot be utilized as numerical or
string types. Enum values can declare mutable instance variables.
*enum-name*
Each enum value object has a "name" instance variable which contains the name