diff options
Diffstat (limited to 'lib/stdlib')
| -rw-r--r-- | lib/stdlib/doc/src/c.xml | 8 | ||||
| -rw-r--r-- | lib/stdlib/doc/src/maps.xml | 22 | ||||
| -rw-r--r-- | lib/stdlib/src/c.erl | 23 | ||||
| -rw-r--r-- | lib/stdlib/src/maps.erl | 21 | ||||
| -rw-r--r-- | lib/stdlib/src/shell_default.erl | 3 | ||||
| -rw-r--r-- | lib/stdlib/test/maps_SUITE.erl | 14 |
6 files changed, 82 insertions, 9 deletions
diff --git a/lib/stdlib/doc/src/c.xml b/lib/stdlib/doc/src/c.xml index b49fa6ad67..b43d4786ae 100644 --- a/lib/stdlib/doc/src/c.xml +++ b/lib/stdlib/doc/src/c.xml @@ -232,6 +232,14 @@ compile:file(<anno>File</anno>, <anno>Options</anno> ++ [report_errors, report_w </desc> </func> <func> + <name name="uptime" arity="0"/> + <fsummary>Print node uptime</fsummary> + <desc> + <p>Prints the node uptime (as given by + <c>erlang:statistics(wall_clock)</c>), in human-readable form.</p> + </desc> + </func> + <func> <name>xm(ModSpec) -> void()</name> <fsummary>Cross reference check a module</fsummary> <type> diff --git a/lib/stdlib/doc/src/maps.xml b/lib/stdlib/doc/src/maps.xml index e46068230a..7345a9357a 100644 --- a/lib/stdlib/doc/src/maps.xml +++ b/lib/stdlib/doc/src/maps.xml @@ -33,6 +33,28 @@ <funcs> <func> + <name name="filter" arity="2"/> + <fsummary>Choose pairs which satisfy a predicate</fsummary> + <desc> + <p> + Returns a map <c><anno>Map2</anno></c> for which predicate + <c><anno>Pred</anno></c> holds true in <c><anno>Map1</anno></c>. + </p> + <p> + The call will fail with a <c>{badmap,Map}</c> exception if + <c><anno>Map1</anno></c> is not a map or with <c>badarg</c> if + <c><anno>Pred</anno></c> is not a function of arity 2. + </p> + <p>Example:</p> + <code type="none"> +> M = #{a => 2, b => 3, c=> 4, "a" => 1, "b" => 2, "c" => 4}, + Pred = fun(K,V) -> is_atom(K) andalso (V rem 2) =:= 0 end, + maps:filter(Pred,M). +#{a => 2,c => 4} </code> + </desc> + </func> + + <func> <name name="find" arity="2"/> <fsummary></fsummary> <desc> diff --git a/lib/stdlib/src/c.erl b/lib/stdlib/src/c.erl index 9860adf04d..d5b24d3c32 100644 --- a/lib/stdlib/src/c.erl +++ b/lib/stdlib/src/c.erl @@ -27,7 +27,7 @@ lc_batch/0, lc_batch/1, i/3,pid/3,m/0,m/1, bt/1, q/0, - erlangrc/0,erlangrc/1,bi/1, flush/0, regs/0, + erlangrc/0,erlangrc/1,bi/1, flush/0, regs/0, uptime/0, nregs/0,pwd/0,ls/0,ls/1,cd/1,memory/1,memory/0, xm/1]). -export([display_info/1]). @@ -65,6 +65,7 @@ help() -> "q() -- quit - shorthand for init:stop()\n" "regs() -- information about registered processes\n" "nregs() -- information about all registered processes\n" + "uptime() -- print node uptime\n" "xm(M) -- cross reference check a module\n" "y(File) -- generate a Yecc parser\n">>). @@ -774,6 +775,26 @@ memory() -> erlang:memory(). memory(TypeSpec) -> erlang:memory(TypeSpec). %% +%% uptime/0 +%% + +-spec uptime() -> 'ok'. + +uptime() -> + io:format("~s~n", [uptime(get_uptime())]). + +uptime({D, {H, M, S}}) -> + lists:flatten( + [[ io_lib:format("~p days, ", [D]) || D > 0 ], + [ io_lib:format("~p hours, ", [H]) || D+H > 0 ], + [ io_lib:format("~p minutes and ", [M]) || D+H+M > 0 ], + io_lib:format("~p seconds", [S])]). + +get_uptime() -> + {UpTime, _} = erlang:statistics(wall_clock), + calendar:seconds_to_daystime(UpTime div 1000). + +%% %% Cross Reference Check %% %%-spec xm(module() | file:filename()) -> xref:m/1 return diff --git a/lib/stdlib/src/maps.erl b/lib/stdlib/src/maps.erl index 3877c150ec..533ff08726 100644 --- a/lib/stdlib/src/maps.erl +++ b/lib/stdlib/src/maps.erl @@ -19,7 +19,8 @@ -module(maps). --export([get/3,fold/3, map/2, size/1, +-export([get/3,filter/2,fold/3, map/2, + size/1, without/2, with/2]). @@ -145,6 +146,19 @@ get(Key,Map,Default) -> erlang:error({badmap,Map},[Key,Map,Default]). +-spec filter(Pred,Map1) -> Map2 when + Pred :: fun((Key, Value) -> boolean()), + Key :: term(), + Value :: term(), + Map1 :: map(), + Map2 :: map(). + +filter(Pred,Map) when is_function(Pred,2), is_map(Map) -> + maps:from_list([{K,V}||{K,V}<-maps:to_list(Map),Pred(K,V)]); +filter(Pred,Map) -> + erlang:error(error_type(Map),[Pred,Map]). + + -spec fold(Fun,Init,Map) -> Acc when Fun :: fun((K, V, AccIn) -> AccOut), Init :: term(), @@ -169,10 +183,7 @@ fold(Fun,Init,Map) -> V2 :: term(). map(Fun,Map) when is_function(Fun, 2), is_map(Map) -> - maps:from_list(lists:map(fun - ({K,V}) -> - {K,Fun(K,V)} - end,maps:to_list(Map))); + maps:from_list([{K,Fun(K,V)}||{K,V}<-maps:to_list(Map)]); map(Fun,Map) -> erlang:error(error_type(Map),[Fun,Map]). diff --git a/lib/stdlib/src/shell_default.erl b/lib/stdlib/src/shell_default.erl index 3fe359af0e..0fca7ff8c7 100644 --- a/lib/stdlib/src/shell_default.erl +++ b/lib/stdlib/src/shell_default.erl @@ -23,7 +23,7 @@ -module(shell_default). -export([help/0,lc/1,c/1,c/2,nc/1,nl/1,l/1,i/0,pid/3,i/3,m/0,m/1, - memory/0,memory/1, + memory/0,memory/1,uptime/0, erlangrc/1,bi/1, regs/0, flush/0,pwd/0,ls/0,ls/1,cd/1, y/1, y/2, xm/1, bt/1, q/0, @@ -92,6 +92,7 @@ pid(X,Y,Z) -> c:pid(X,Y,Z). pwd() -> c:pwd(). q() -> c:q(). regs() -> c:regs(). +uptime() -> c:uptime(). xm(Mod) -> c:xm(Mod). y(File) -> c:y(File). y(File, Opts) -> c:y(File, Opts). diff --git a/lib/stdlib/test/maps_SUITE.erl b/lib/stdlib/test/maps_SUITE.erl index 1d9c041a74..21e146ae3d 100644 --- a/lib/stdlib/test/maps_SUITE.erl +++ b/lib/stdlib/test/maps_SUITE.erl @@ -34,7 +34,7 @@ -export([init_per_testcase/2]). -export([end_per_testcase/2]). --export([t_get_3/1, +-export([t_get_3/1, t_filter_2/1, t_fold_3/1,t_map_2/1,t_size_1/1, t_with_2/1,t_without_2/1]). @@ -45,7 +45,7 @@ suite() -> [{ct_hooks, [ts_install_cth]}]. all() -> - [t_get_3, + [t_get_3,t_filter_2, t_fold_3,t_map_2,t_size_1, t_with_2,t_without_2]. @@ -99,6 +99,16 @@ t_with_2(_Config) -> ?badarg(with,[a,#{}]) = (catch maps:with(a,#{})), ok. +t_filter_2(Config) when is_list(Config) -> + M = #{a => 2, b => 3, c=> 4, "a" => 1, "b" => 2, "c" => 4}, + Pred1 = fun(K,V) -> is_atom(K) andalso (V rem 2) =:= 0 end, + Pred2 = fun(K,V) -> is_list(K) andalso (V rem 2) =:= 0 end, + #{a := 2,c := 4} = maps:filter(Pred1,M), + #{"b" := 2,"c" := 4} = maps:filter(Pred2,M), + %% error case + ?badmap(a,filter,[_,a]) = (catch maps:filter(fun(_,_) -> ok end,id(a))), + ?badarg(filter,[<<>>,#{}]) = (catch maps:filter(id(<<>>),#{})), + ok. t_fold_3(Config) when is_list(Config) -> Vs = lists:seq(1,200), |