File 2191-Add-take-2-to-all-dictionary-modules.patch of Package erlang
From a2d92dff3a8acc534daeeb3dea5edda406a6ab0d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= <bjorn@erlang.org>
Date: Fri, 16 Dec 2016 12:50:28 +0100
Subject: [PATCH] Add take/2 to all dictionary modules
Similar to maps:take/2, add take/2 to the other dictionary
modules in STDLIB:
orddict:take(Key, Dict) -> {Val,NewDict} | 'error'.
dict:take(Key, Dict) -> {Val,NewDict} | 'error'.
gb_trees:take(Key, Dict) -> {Val,NewDict}.
For gb_trees also add:
gb_trees:take_any(Key, Dict) -> {Val,NewDict} | 'error'.
gb_trees already has delete() and delete_any(), so we will
follow that design pattern.
Suggested by Boris Bochkaryov in https://github.com/erlang/otp/pull/1209.
---
lib/stdlib/doc/src/dict.xml | 10 +++++++++
lib/stdlib/doc/src/gb_trees.xml | 22 +++++++++++++++++++
lib/stdlib/doc/src/orddict.xml | 9 ++++++++
lib/stdlib/src/dict.erl | 23 +++++++++++++++++++-
lib/stdlib/src/gb_trees.erl | 45 ++++++++++++++++++++++++++++++++++++++-
lib/stdlib/src/orddict.erl | 19 ++++++++++++++++-
lib/stdlib/test/dict_SUITE.erl | 27 ++++++++++++++++++++---
lib/stdlib/test/dict_test_lib.erl | 20 ++++++++++++++++-
8 files changed, 168 insertions(+), 7 deletions(-)
diff --git a/lib/stdlib/doc/src/dict.xml b/lib/stdlib/doc/src/dict.xml
index c926ff1b5..c229a1872 100644
--- a/lib/stdlib/doc/src/dict.xml
+++ b/lib/stdlib/doc/src/dict.xml
@@ -106,6 +106,16 @@
</func>
<func>
+ <name name="take" arity="2"/>
+ <fsummary>Return value and new dictionary without element with this value.</fsummary>
+ <desc>
+ <p>This function returns value from dictionary and a
+ new dictionary without this value.
+ Returns <c>error</c> if the key is not present in the dictionary.</p>
+ </desc>
+ </func>
+
+ <func>
<name name="filter" arity="2"/>
<fsummary>Select elements that satisfy a predicate.</fsummary>
<desc>
diff --git a/lib/stdlib/doc/src/gb_trees.xml b/lib/stdlib/doc/src/gb_trees.xml
index 790d4b8bf..5cfff021c 100644
--- a/lib/stdlib/doc/src/gb_trees.xml
+++ b/lib/stdlib/doc/src/gb_trees.xml
@@ -109,6 +109,28 @@
</func>
<func>
+ <name name="take" arity="2"/>
+ <fsummary>Returns a value and new tree without node with key <c>Key</c>.</fsummary>
+ <desc>
+ <p>Returns a value <c><anno>Value</anno></c> from node with key <c><anno>Key</anno></c>
+ and new <c><anno>Tree2</anno></c> without the node with this value.
+ Assumes that the node with key is present in the tree,
+ crashes otherwise.</p>
+ </desc>
+ </func>
+
+ <func>
+ <name name="take_any" arity="2"/>
+ <fsummary>Returns a value and new tree without node with key <c>Key</c>.</fsummary>
+ <desc>
+ <p>Returns a value <c><anno>Value</anno></c> from node with key <c><anno>Key</anno></c>
+ and new <c><anno>Tree2</anno></c> without the node with this value.
+ Returns <c>error</c> if the node with the key is not present in
+ the tree.</p>
+ </desc>
+ </func>
+
+ <func>
<name name="empty" arity="0"/>
<fsummary>Return an empty tree.</fsummary>
<desc>
diff --git a/lib/stdlib/doc/src/orddict.xml b/lib/stdlib/doc/src/orddict.xml
index 109b038cb..26bbf499c 100644
--- a/lib/stdlib/doc/src/orddict.xml
+++ b/lib/stdlib/doc/src/orddict.xml
@@ -113,6 +113,15 @@
</func>
<func>
+ <name name="take" arity="2"/>
+ <fsummary>Return value and new dictionary without element with this value.</fsummary>
+ <desc>
+ <p>This function returns value from dictionary and new dictionary without this value.
+ Returns <c>error</c> if the key is not present in the dictionary.</p>
+ </desc>
+ </func>
+
+ <func>
<name name="filter" arity="2"/>
<fsummary>Select elements that satisfy a predicate.</fsummary>
<desc>
diff --git a/lib/stdlib/src/dict.erl b/lib/stdlib/src/dict.erl
index f921e28ef..9449ba3dc 100644
--- a/lib/stdlib/src/dict.erl
+++ b/lib/stdlib/src/dict.erl
@@ -38,7 +38,7 @@
%% Standard interface.
-export([new/0,is_key/2,to_list/1,from_list/1,size/1,is_empty/1]).
--export([fetch/2,find/2,fetch_keys/1,erase/2]).
+-export([fetch/2,find/2,fetch_keys/1,erase/2,take/2]).
-export([store/3,append/3,append_list/3,update/3,update/4,update_counter/3]).
-export([fold/3,map/2,filter/2,merge/3]).
@@ -172,6 +172,27 @@ erase_key(Key, [E|Bkt0]) ->
{[E|Bkt1],Dc};
erase_key(_, []) -> {[],0}.
+-spec take(Key, Dict) -> {Value, Dict1} | error when
+ Dict :: dict(Key, Value),
+ Dict1 :: dict(Key, Value),
+ Key :: term(),
+ Value :: term().
+
+take(Key, D0) ->
+ Slot = get_slot(D0, Key),
+ case on_bucket(fun (B0) -> take_key(Key, B0) end, D0, Slot) of
+ {D1,{Value,Dc}} ->
+ {Value, maybe_contract(D1, Dc)};
+ {_,error} -> error
+ end.
+
+take_key(Key, [?kv(Key,Val)|Bkt]) ->
+ {Bkt,{Val,1}};
+take_key(Key, [E|Bkt0]) ->
+ {Bkt1,Res} = take_key(Key, Bkt0),
+ {[E|Bkt1],Res};
+take_key(_, []) -> {[],error}.
+
-spec store(Key, Value, Dict1) -> Dict2 when
Dict1 :: dict(Key, Value),
Dict2 :: dict(Key, Value).
diff --git a/lib/stdlib/src/gb_trees.erl b/lib/stdlib/src/gb_trees.erl
index 457287fa5..c0cdde012 100644
--- a/lib/stdlib/src/gb_trees.erl
+++ b/lib/stdlib/src/gb_trees.erl
@@ -52,6 +52,13 @@
%% - delete_any(X, T): removes key X from tree T if the key is present
%% in the tree, otherwise does nothing; returns new tree.
%%
+%% - take(X, T): removes element with key X from tree T; returns new tree
+%% without removed element. Assumes that the key is present in the tree.
+%%
+%% - take_any(X, T): removes element with key X from tree T and returns
+%% a new tree if the key is present; otherwise does nothing and returns
+%% 'error'.
+%%
%% - balance(T): rebalances tree T. Note that this is rarely necessary,
%% but may be motivated when a large number of entries have been
%% deleted from the tree without further insertions. Rebalancing could
@@ -114,7 +121,8 @@
-export([empty/0, is_empty/1, size/1, lookup/2, get/2, insert/3,
update/3, enter/3, delete/2, delete_any/2, balance/1,
is_defined/2, keys/1, values/1, to_list/1, from_orddict/1,
- smallest/1, largest/1, take_smallest/1, take_largest/1,
+ smallest/1, largest/1, take/2, take_any/2,
+ take_smallest/1, take_largest/1,
iterator/1, iterator_from/2, next/1, map/2]).
@@ -416,6 +424,41 @@ merge(Smaller, Larger) ->
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+-spec take_any(Key, Tree1) -> {Value, Tree2} | 'error' when
+ Tree1 :: tree(Key, _),
+ Tree2 :: tree(Key, _),
+ Key :: term(),
+ Value :: term().
+
+take_any(Key, Tree) ->
+ case is_defined(Key, Tree) of
+ true -> take(Key, Tree);
+ false -> error
+ end.
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+-spec take(Key, Tree1) -> {Value, Tree2} when
+ Tree1 :: tree(Key, _),
+ Tree2 :: tree(Key, _),
+ Key :: term(),
+ Value :: term().
+
+take(Key, {S, T}) when is_integer(S), S >= 0 ->
+ {Value, Res} = take_1(Key, T),
+ {Value, {S - 1, Res}}.
+
+take_1(Key, {Key1, Value, Smaller, Larger}) when Key < Key1 ->
+ {Value2, Smaller1} = take_1(Key, Smaller),
+ {Value2, {Key1, Value, Smaller1, Larger}};
+take_1(Key, {Key1, Value, Smaller, Bigger}) when Key > Key1 ->
+ {Value2, Bigger1} = take_1(Key, Bigger),
+ {Value2, {Key1, Value, Smaller, Bigger1}};
+take_1(_, {_Key, Value, Smaller, Larger}) ->
+ {Value, merge(Smaller, Larger)}.
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
-spec take_smallest(Tree1) -> {Key, Value, Tree2} when
Tree1 :: tree(Key, Value),
Tree2 :: tree(Key, Value).
diff --git a/lib/stdlib/src/orddict.erl b/lib/stdlib/src/orddict.erl
index 37cf0084f..caa59099a 100644
--- a/lib/stdlib/src/orddict.erl
+++ b/lib/stdlib/src/orddict.erl
@@ -22,7 +22,7 @@
%% Standard interface.
-export([new/0,is_key/2,to_list/1,from_list/1,size/1,is_empty/1]).
--export([fetch/2,find/2,fetch_keys/1,erase/2]).
+-export([fetch/2,find/2,fetch_keys/1,erase/2,take/2]).
-export([store/3,append/3,append_list/3,update/3,update/4,update_counter/3]).
-export([fold/3,map/2,filter/2,merge/3]).
@@ -106,6 +106,23 @@ erase(Key, [{K,_}=E|Dict]) when Key > K ->
erase(_Key, [{_K,_Val}|Dict]) -> Dict; %Key == K
erase(_, []) -> [].
+-spec take(Key, Orddict) -> {Value, Orddict1} | error when
+ Orddict :: orddict(Key, Value),
+ Orddict1 :: orddict(Key, Value),
+ Key :: term(),
+ Value :: term().
+
+take(Key, Dict) ->
+ take_1(Key, Dict, []).
+
+take_1(Key, [{K,_}|_], _Acc) when Key < K ->
+ error;
+take_1(Key, [{K,_}=P|D], Acc) when Key > K ->
+ take_1(Key, D, [P|Acc]);
+take_1(_Key, [{_K,Value}|D], Acc) ->
+ {Value,lists:reverse(Acc, D)};
+take_1(_, [], _) -> error.
+
-spec store(Key, Value, Orddict1) -> Orddict2 when
Orddict1 :: orddict(Key, Value),
Orddict2 :: orddict(Key, Value).
diff --git a/lib/stdlib/test/dict_SUITE.erl b/lib/stdlib/test/dict_SUITE.erl
index 47358d729..e99af9ad4 100644
--- a/lib/stdlib/test/dict_SUITE.erl
+++ b/lib/stdlib/test/dict_SUITE.erl
@@ -23,10 +23,10 @@
-module(dict_SUITE).
--export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1,
+-export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1,
init_per_group/2,end_per_group/2,
init_per_testcase/2,end_per_testcase/2,
- create/1,store/1,iterate/1]).
+ create/1,store/1,iterate/1,remove/1]).
-include_lib("common_test/include/ct.hrl").
@@ -37,7 +37,7 @@ suite() ->
{timetrap,{minutes,5}}].
all() ->
- [create, store, iterate].
+ [create, store, remove, iterate].
groups() ->
[].
@@ -92,6 +92,27 @@ store_1(List, M) ->
end,
D0.
+remove(_Config) ->
+ test_all([{0,87}], fun remove_1/2).
+
+remove_1(List0, M) ->
+ %% Make sure that keys are unique. Randomize key order.
+ List1 = orddict:from_list(List0),
+ List2 = lists:sort([{rand:uniform(),E} || E <- List1]),
+ List = [E || {_,E} <- List2],
+ D0 = M(from_list, List),
+ remove_2(List, D0, M).
+
+remove_2([{Key,Val}|T], D0, M) ->
+ {Val,D1} = M(take, {Key,D0}),
+ error = M(take, {Key,D1}),
+ D2 = M(erase, {Key,D0}),
+ true = M(equal, {D1,D2}),
+ remove_2(T, D1, M);
+remove_2([], D, M) ->
+ true = M(is_empty, D),
+ D.
+
%%%
%%% Test specifics for gb_trees.
%%%
diff --git a/lib/stdlib/test/dict_test_lib.erl b/lib/stdlib/test/dict_test_lib.erl
index 7c4c3572a..f6fef7bdf 100644
--- a/lib/stdlib/test/dict_test_lib.erl
+++ b/lib/stdlib/test/dict_test_lib.erl
@@ -33,7 +33,9 @@ new(Mod, Eq) ->
(iterator, S) -> Mod:iterator(S);
(iterator_from, {Start, S}) -> Mod:iterator_from(Start, S);
(next, I) -> Mod:next(I);
- (to_list, D) -> to_list(Mod, D)
+ (to_list, D) -> to_list(Mod, D);
+ (erase, {K,D}) -> erase(Mod, K, D);
+ (take, {K,D}) -> take(Mod, K, D)
end.
empty(Mod) ->
@@ -67,3 +69,19 @@ enter(Mod, Key, Val, Dict) ->
true ->
Mod:store(Key, Val, Dict)
end.
+
+erase(Mod, Key, Val) when Mod =:= dict; Mod =:= orddict ->
+ Mod:erase(Key, Val);
+erase(gb_trees, Key, Val) ->
+ gb_trees:delete_any(Key, Val).
+
+take(gb_trees, Key, Val) ->
+ Res = try
+ gb_trees:take(Key, Val)
+ catch
+ error:_ ->
+ error
+ end,
+ Res = gb_trees:take_any(Key, Val);
+take(Mod, Key, Val) ->
+ Mod:take(Key, Val).
--
2.11.0
