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patch 8.2.3818: cannot filter or map characters in a string

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Problem:    Cannot filter or map characters in a string.
Solution:   Make filter() and map() work on a string. (Naruhiko Nishino,
            closes #9327)
This commit is contained in:
rbtnn
2021-12-15 19:14:54 +00:00
committed by Bram Moolenaar
parent f87dac04c3
commit c479ce032f
5 changed files with 169 additions and 27 deletions
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58
runtime/doc/eval.txt
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@@ -2628,7 +2628,8 @@ extendnew({expr1}, {expr2} [, {expr3}])
feedkeys({string} [, {mode}]) Number add key sequence to typeahead buffer
filereadable({file}) Number |TRUE| if {file} is a readable file
filewritable({file}) Number |TRUE| if {file} is a writable file
filter({expr1}, {expr2}) List/Dict remove items from {expr1} where
filter({expr1}, {expr2}) List/Dict/Blob/String
remove items from {expr1} where
{expr2} is 0
finddir({name} [, {path} [, {count}]])
String find directory {name} in {path}
@@ -2786,14 +2787,16 @@ localtime() Number current time
log({expr}) Float natural logarithm (base e) of {expr}
log10({expr}) Float logarithm of Float {expr} to base 10
luaeval({expr} [, {expr}]) any evaluate |Lua| expression
map({expr1}, {expr2}) List/Dict change each item in {expr1} to {expr}
map({expr1}, {expr2}) List/Dict/Blob/String
change each item in {expr1} to {expr2}
maparg({name} [, {mode} [, {abbr} [, {dict}]]])
String or Dict
rhs of mapping {name} in mode {mode}
mapcheck({name} [, {mode} [, {abbr}]])
String check for mappings matching {name}
mapnew({expr1}, {expr2}) List/Dict like |map()| but creates a new List
or Dictionary
mapnew({expr1}, {expr2}) List/Dict/Blob/String
like |map()| but creates a new List or
Dictionary
mapset({mode}, {abbr}, {dict}) none restore mapping from |maparg()| result
match({expr}, {pat} [, {start} [, {count}]])
Number position where {pat} matches in {expr}
@@ -4878,10 +4881,11 @@ filewritable({file}) *filewritable()*
filter({expr1}, {expr2}) *filter()*
{expr1} must be a |List|, |Blob| or |Dictionary|.
{expr1} must be a |List|, |String|, |Blob| or |Dictionary|.
For each item in {expr1} evaluate {expr2} and when the result
is zero remove the item from the |List| or |Dictionary|. For a
|Blob| each byte is removed.
is zero or false remove the item from the |List| or
|Dictionary|. Similarly for each byte in a |Blob| and each
charactor in a |String|.
{expr2} must be a |string| or |Funcref|.
@@ -4916,14 +4920,16 @@ filter({expr1}, {expr2}) *filter()*
< If you do not use "val" you can leave it out: >
call filter(myList, {idx -> idx % 2 == 1})
<
The operation is done in-place. If you want a |List| or
|Dictionary| to remain unmodified make a copy first: >
For a |List| and a |Dictionary| the operation is done
in-place. If you want it to remain unmodified make a copy
first: >
:let l = filter(copy(mylist), 'v:val =~ "KEEP"')
< Returns {expr1}, the |List| , |Blob| or |Dictionary| that was
filtered. When an error is encountered while evaluating
{expr2} no further items in {expr1} are processed. When
{expr2} is a Funcref errors inside a function are ignored,
< Returns {expr1}, the |List| or |Dictionary| that was filtered,
or a new |Blob| or |String|.
When an error is encountered while evaluating {expr2} no
further items in {expr1} are processed.
When {expr2} is a Funcref errors inside a function are ignored,
unless it was defined with the "abort" flag.
Can also be used as a |method|: >
@@ -7566,16 +7572,19 @@ luaeval({expr} [, {expr}]) *luaeval()*
< {only available when compiled with the |+lua| feature}
map({expr1}, {expr2}) *map()*
{expr1} must be a |List|, |Blob| or |Dictionary|.
Replace each item in {expr1} with the result of evaluating
{expr2}. For a |Blob| each byte is replaced.
{expr1} must be a |List|, |String|, |Blob| or |Dictionary|.
When {expr1} is a |List|| or |Dictionary|, replace each
item in {expr1} with the result of evaluating {expr2}.
For a |Blob| each byte is replaced.
For a |String|, each character, including composing
characters, is replaced.
If the item type changes you may want to use |mapnew()| to
create a new List or Dictionary. This is required when using
Vim9 script.
{expr2} must be a |string| or |Funcref|.
{expr2} must be a |String| or |Funcref|.
If {expr2} is a |string|, inside {expr2} |v:val| has the value
If {expr2} is a |String|, inside {expr2} |v:val| has the value
of the current item. For a |Dictionary| |v:key| has the key
of the current item and for a |List| |v:key| has the index of
the current item. For a |Blob| |v:key| has the index of the
@@ -7605,14 +7614,15 @@ map({expr1}, {expr2}) *map()*
< If you do not use "key" you can use a short name: >
call map(myDict, {_, val -> 'item: ' . val})
<
The operation is done in-place. If you want a |List| or
|Dictionary| to remain unmodified make a copy first: >
The operation is done in-place for a |List| and |Dictionary|.
If you want it to remain unmodified make a copy first: >
:let tlist = map(copy(mylist), ' v:val . "\t"')
< Returns {expr1}, the |List|, |Blob| or |Dictionary| that was
filtered. When an error is encountered while evaluating
{expr2} no further items in {expr1} are processed. When
{expr2} is a Funcref errors inside a function are ignored,
< Returns {expr1}, the |List| or |Dictionary| that was filtered,
or a new |Blob| or |String|.
When an error is encountered while evaluating {expr2} no
further items in {expr1} are processed.
When {expr2} is a Funcref errors inside a function are ignored,
unless it was defined with the "abort" flag.
Can also be used as a |method|: >