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patch 7.4.2119

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Problem:    Closures are not supported.
Solution:   Capture variables in lambdas from the outer scope. (Yasuhiro
            Matsumoto, Ken Takata)
This commit is contained in:
Bram Moolenaar
2016-07-29 22:15:09 +02:00
parent 83a2a80d6f
commit 1e96d9bf98
9 changed files with 450 additions and 47 deletions
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27
runtime/doc/eval.txt
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@@ -1,4 +1,4 @@
*eval.txt* For Vim version 7.4. Last change: 2016 Jul 24
*eval.txt* For Vim version 7.4. Last change: 2016 Jul 29
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -40,7 +40,7 @@ done, the features in this document are not available. See |+eval| and
There are nine types of variables:
Number A 32 or 64 bit signed number. |expr-number| *Number*
64-bit Number is available only when compiled with the
64-bit Numbers are available only when compiled with the
|+num64| feature.
Examples: -123 0x10 0177
@@ -1219,7 +1219,7 @@ the following ways:
1. The body of the lambda expression is an |expr1| and not a sequence of |Ex|
commands.
2. The prefix "a:" is optional for arguments. E.g.: >
2. The prefix "a:" should not be used for arguments. E.g.: >
:let F = {arg1, arg2 -> arg1 - arg2}
:echo F(5, 2)
< 3
@@ -1228,6 +1228,18 @@ The arguments are optional. Example: >
:let F = {-> 'error function'}
:echo F()
< error function
*closure*
Lambda expressions can access outer scope variables and arguments. This is
often called a closure. Example where "i" a and "a:arg" are used in a lambda
while they exists in the function scope. They remain valid even after the
function returns: >
:function Foo(arg)
: let i = 3
: return {x -> x + i - a:arg}
:endfunction
:let Bar = Foo(4)
:echo Bar(6)
< 5
Examples for using a lambda expression with |sort()|, |map()| and |filter()|: >
:echo map([1, 2, 3], {idx, val -> val + 1})
@@ -1245,6 +1257,12 @@ The lambda expression is also useful for Channel, Job and timer: >
Note how execute() is used to execute an Ex command. That's ugly though.
Lambda expressions have internal names like '<lambda>42'. If you get an error
for a lambda expression, you can find what it is with the following command: >
:function {'<lambda>42'}
See also: |numbered-function|
==============================================================================
3. Internal variable *internal-variables* *E461*
@@ -7494,7 +7512,8 @@ test_null_string() *test_null_string()*
test_settime({expr}) *test_settime()*
Set the time Vim uses internally. Currently only used for
timestamps in the history, as they are used in viminfo.
timestamps in the history, as they are used in viminfo, and
for undo.
{expr} must evaluate to a number. When the value is zero the
normal behavior is restored.