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Diffstat (limited to 'lib/diameter/src/base/diameter_info.erl')
| -rw-r--r-- | lib/diameter/src/base/diameter_info.erl | 869 |
1 files changed, 0 insertions, 869 deletions
diff --git a/lib/diameter/src/base/diameter_info.erl b/lib/diameter/src/base/diameter_info.erl deleted file mode 100644 index 10972f3231..0000000000 --- a/lib/diameter/src/base/diameter_info.erl +++ /dev/null @@ -1,869 +0,0 @@ -%% -%% %CopyrightBegin% -%% -%% Copyright Ericsson AB 2010-2014. All Rights Reserved. -%% -%% The contents of this file are subject to the Erlang Public License, -%% Version 1.1, (the "License"); you may not use this file except in -%% compliance with the License. You should have received a copy of the -%% Erlang Public License along with this software. If not, it can be -%% retrieved online at http://www.erlang.org/. -%% -%% Software distributed under the License is distributed on an "AS IS" -%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See -%% the License for the specific language governing rights and limitations -%% under the License. -%% -%% %CopyrightEnd% -%% - -%% -%% Generic functions for formatting table listings and more. Used by -%% diameter_dbg. -%% - --module(diameter_info). - --export([usage/1, - format/1, - format/2, - format/3, - format/4, - table/2, - tables/1, - tables/2, - split/2, - split/3, - tab2list/1, - modules/1, - versions/1, - version_info/1, - attrs/2, - compiled/1, - procs/1, - latest/1, - list/1]). - -%% Support for rolling your own. --export([sep/0, - sep/1, - widest/1, - p/1, - p/3]). - --compile({no_auto_import,[max/2]}). - --export([collect/2]). - --define(LONG_TIMEOUT, 30000). --define(VALUES(Rec), tl(tuple_to_list(Rec))). - -%%% ---------------------------------------------------------- -%%% # usage(String) -%%% ---------------------------------------------------------- - -usage(Usage) -> - sep($+), - io:format("+ ~p~n", [?MODULE]), - io:format("~n~s~n~n", [compact(Usage)]), - sep($+). - -%%% -%%% The function format/3, for pretty-printing tables, comes in -%%% several flavours. -%%% - -%%% ---------------------------------------------------------- -%%% # format(TableName, Fields, SplitFun) -%%% -%%% Input: TableName = atom() name of table. -%%% -%%% Fields = List of field names for the records maintained -%%% in the specified table. Can be empty, in which -%%% case entries are listed unadorned of field names -%%% and SplitFun is unused. -%%% | Integer, equivalent to a list with this many '' atoms. -%%% | Arity 1 fun mapping a table entry to a Fields list -%%% or a tuple {Fields, Values} of lists of the same -%%% length. -%%% -%%% If Fields is a list then its length must be the same -%%% as or one less than the size of the tuples contained -%%% in the table. (The values printed then being those -%%% in the tuple or record in question.) -%%% -%%% SplitFun = Arity 3 fun applied as -%%% -%%% SplitFun(TableName, Fields, Values) -%%% -%%% in order to obtain a tuple -%%% -%%% {Field, RestFields, Value, RestValues} -%%% -%%% for which Field/Value will be formatted on -%%% STDOUT. (This is to allow a value to be -%%% transformed before being output by returning a -%%% new value and/or replacing the remainder of -%%% the list.) The returned lists must have the -%%% same length and Field here is an atom, '' causing -%%% a value to be listed unadorned of the field name. -%%% -%%% Field can also be list of field names, in -%%% which case Value must be a record of the -%%% corresponding type. -%%% -%%% | Arity 2 fun applied as SplitFun(Fields, Values). -%%% -%%% Output: Count | undefined -%%% -%%% Count = Number of entries output. -%%% -%%% Description: Pretty-print records in a named table. -%%% ---------------------------------------------------------- - -format(Table, Fields, SFun) - when is_atom(Table), is_function(SFun, 2) -> - ft(ets:info(Table), Table, SFun, Fields); - -format(Table, Fields, SFun) - when is_atom(Table), is_function(SFun, 3) -> - format(Table, Fields, fun(Fs,Vs) -> SFun(Table, Fs, Vs) end); - -%%% ---------------------------------------------------------- -%%% # format(Recs, Fields, SplitFun) -%%% -%%% Input: Recs = list of records/tuples -%%% Fields = As for format(Table, Fields, SplitFun), a table -%%% entry there being a member of Recs. -%%% SplitFun = Arity 3 fun applied as above but with the TableName -%%% replaced by the first element of the records in -%%% question. -%%% | Arity 2 fun as for format/3. -%%% -%%% Output: length(Recs) -%%% -%%% Description: Pretty print records/tuples. -%%% ---------------------------------------------------------- - -format(Recs, Fields, SFun) - when is_list(Recs), is_function(SFun, 3) -> - lists:foldl(fun(R,A) -> f(recsplit(SFun, R), 0, Fields, R, A) end, - 0, - Recs); - -format(Recs, Fields, SFun) - when is_list(Recs), is_function(SFun, 2) -> - lists:foldl(fun(R,A) -> f(SFun, 0, Fields, R, A) end, - 0, - Recs); - -%%% ---------------------------------------------------------- -%%% # format(Tables, SplitFun, CollectFun) -%%% -%%% Input: Tables = list of {TableName, Fields}. -%%% SplitFun = As for format(Table, Fields, SplitFun). -%%% CollectFun = arity 1 fun mapping a table name to a list -%%% of elements. A non-list can be returned to indicate -%%% that the table in question doesn't exist. -%%% -%%% Output: Number of entries output. -%%% -%%% Description: Pretty-print records in a named tables as collected -%%% from known nodes. Each table listing is preceeded by -%%% a banner. -%%% ---------------------------------------------------------- - -format(Tables, SFun, CFun) - when is_list(Tables), is_function(CFun, 1) -> - format_remote(Tables, - SFun, - rpc:multicall(nodes(known), - ?MODULE, - collect, - [CFun, lists:map(fun({T,_}) -> T end, Tables)], - ?LONG_TIMEOUT)); - -%%% ---------------------------------------------------------- -%%% # format(LocalTables, RemoteTables, SplitFun, CollectFun) -%%% # format(LocalTables, RemoteTables, SplitFun) -%%% -%%% Input: LocalTables = list of {TableName, Fields}. -%%% | list of {TableName, Recs, Fields} -%%% RemoteTable = list of {TableName, Fields}. -%%% SplitFun, CollectFun = As for format(Table, CollectFun, SplitFun). -%%% -%%% Output: Number of entries output. -%%% -%%% Description: Pretty-print records in a named tables as collected -%%% from local and remote nodes. Each table listing is -%%% preceeded by a banner. -%%% ---------------------------------------------------------- - -format(Local, Remote, SFun) -> - format(Local, Remote, SFun, fun tab2list/1). - -format(Local, Remote, SFun, CFun) - when is_list(Local), is_list(Remote), is_function(CFun, 1) -> - format_local(Local, SFun) + format(Remote, SFun, CFun). - -%%% ---------------------------------------------------------- -%%% # format(Tables, SplitFun) -%%% ---------------------------------------------------------- - -format(Tables, SFun) - when is_list(Tables), (is_function(SFun, 2) or is_function(SFun, 3)) -> - format(Tables, SFun, fun tab2list/1); - -format(Tables, CFun) - when is_list(Tables), is_function(CFun, 1) -> - format(Tables, fun split/2, CFun). - -%%% ---------------------------------------------------------- -%%% # format(Table|Tables) -%%% ---------------------------------------------------------- - -format(Table) - when is_atom(Table) -> - format(Table, [], fun split/2); - -format(Tables) - when is_list(Tables) -> - format(Tables, fun split/2, fun tab2list/1). - -%%% ---------------------------------------------------------- -%%% # split(TableName, Fields, Values) -%%% -%%% Description: format/3 SplitFun that does nothing special. -%%% ---------------------------------------------------------- - -split([F|FT], [V|VT]) -> - {F, FT, V, VT}. - -split(_, Fs, Vs) -> - split(Fs, Vs). - -%%% ---------------------------------------------------------- -%%% # tab2list(TableName) -%%% -%%% Description: format/4 CollectFun that extracts records from an -%%% existing ets table. -%%% ---------------------------------------------------------- - -tab2list(Table) -> - case ets:info(Table) of - undefined = No -> - No; - _ -> - ets:tab2list(Table) - end. - -list(Table) -> - l(tab2list(Table)). - -l(undefined = No) -> - No; -l(List) - when is_list(List) -> - io:format("~p~n", [List]), - length(List). - -%%% ---------------------------------------------------------- -%%% # table(TableName, Fields) -%%% ---------------------------------------------------------- - -table(Table, Fields) -> - format(Table, Fields, fun split/2). - -%%% ---------------------------------------------------------- -%%% # tables(LocalTables, RemoteTables) -%%% ---------------------------------------------------------- - -tables(Local, Remote) -> - format(Local, Remote, fun split/2). - -%%% ---------------------------------------------------------- -%%% # tables(Tables) -%%% ---------------------------------------------------------- - -tables(Tables) -> - format(Tables, fun split/2). - -%%% ---------------------------------------------------------- -%%% # modules(Prefix|Prefixes) -%%% -%%% Input: Prefix = atom() -%%% -%%% Description: Return the list of all loaded modules with the -%%% specified prefix. -%%% ---------------------------------------------------------- - -modules(Prefix) - when is_atom(Prefix) -> - lists:sort(mods(Prefix)); - -modules(Prefixes) - when is_list(Prefixes) -> - lists:sort(lists:flatmap(fun modules/1, Prefixes)). - -mods(Prefix) -> - P = atom_to_list(Prefix), - lists:filter(fun(M) -> - lists:prefix(P, atom_to_list(M)) - end, - erlang:loaded()). - -%%% ---------------------------------------------------------- -%%% # versions(Modules|Prefix) -%%% -%%% Output: Number of modules listed. -%%% -%%% Description: List the versions of the specified modules. -%%% ---------------------------------------------------------- - -versions(Modules) -> - {SysInfo, OsInfo, ModInfo} = version_info(Modules), - sep(), - print_sys_info(SysInfo), - sep(), - print_os_info(OsInfo), - sep(), - print_mod_info(ModInfo), - sep(). - -%%% ---------------------------------------------------------- -%%% # attrs(Modules|Prefix, Attr|FormatFun) -%%% -%%% Output: Number of modules listed. -%%% -%%% Description: List an attribute from module_info. -%%% ---------------------------------------------------------- - -attrs(Modules, Attr) - when is_atom(Attr) -> - attrs(Modules, fun(W,M) -> attr(W, M, Attr, fun attr/1) end); - -attrs(Modules, Fun) - when is_list(Modules) -> - sep(), - W = 2 + widest(Modules), - N = lists:foldl(fun(M,A) -> Fun(W,M), A+1 end, 0, Modules), - sep(), - N; - -attrs(Prefix, Fun) -> - attrs(modules(Prefix), Fun). - -%% attr/1 - -attr(T) when is_atom(T) -> - atom_to_list(T); -attr(N) when is_integer(N) -> - integer_to_list(N); -attr(V) -> - case is_list(V) andalso lists:all(fun is_char/1, V) of - true -> %% string - V; - false -> - io_lib:format("~p", [V]) - end. - -is_char(C) -> - 0 =< C andalso C < 256. - -%% attr/4 - -attr(Width, Mod, Attr, VFun) -> - io:format(": ~*s~s~n", [-Width, Mod, attr(Mod, Attr, VFun)]). - -attr(Mod, Attr, VFun) -> - Key = key(Attr), - try - VFun(val(Attr, keyfetch(Attr, Mod:module_info(Key)))) - catch - _:_ -> - "-" - end. - -attr(Mod, Attr) -> - attr(Mod, Attr, fun attr/1). - -key(time) -> compile; -key(_) -> attributes. - -val(time, {_,_,_,_,_,_} = T) -> - lists:flatten(io_lib:format("~p-~2..0B-~2..0B ~2..0B:~2..0B:~2..0B", - tuple_to_list(T))); -val(_, [V]) -> - V. - -%%% ---------------------------------------------------------- -%%% # compiled(Modules|Prefix) -%%% -%%% Output: Number of modules listed. -%%% -%%% Description: List the compile times of the specified modules. -%%% ---------------------------------------------------------- - -compiled(Modules) - when is_list(Modules) -> - attrs(Modules, fun compiled/2); - -compiled(Prefix) -> - compiled(modules(Prefix)). - -compiled(Width, Mod) -> - io:format(": ~*s~19s ~s~n", [-Width, - Mod, - attr(Mod, time), - opt(attr(Mod, date))]). - -opt("-") -> - ""; -opt(D) -> - "(" ++ D ++ ")". - -%%% ---------------------------------------------------------- -%%% # procs(Pred|Prefix|Prefixes|Pid|Pids) -%%% -%%% Input: Pred = arity 2 fun returning true|false when applied to a -%%% pid and its process info. -%%% -%%% Output: Number of processes listed. -%%% -%%% Description: List process info for all local processes that test -%%% true with the specified predicate. With the prefix -%%% form, those processes that are either currently -%%% executing in, started executing in, or have a -%%% registered name with a specified prefix are listed. -%%% With the pid forms, only those process that are local -%%% are listed and those that are dead list only the pid -%%% itself. -%%% ---------------------------------------------------------- - -procs(Pred) - when is_function(Pred, 2) -> - procs(Pred, erlang:processes()); - -procs([]) -> - 0; - -procs(Prefix) - when is_atom(Prefix) -> - procs(fun(_,I) -> info(fun pre1/2, I, atom_to_list(Prefix)) end); - -procs(Prefixes) - when is_atom(hd(Prefixes)) -> - procs(fun(_,I) -> info(fun pre/2, I, Prefixes) end); - -procs(Pid) - when is_pid(Pid) -> - procs(fun true2/2, [Pid]); - -procs(Pids) - when is_list(Pids) -> - procs(fun true2/2, Pids). - -true2(_,_) -> - true. - -%% procs/2 - -procs(Pred, Pids) -> - Procs = lists:foldl(fun(P,A) -> - procs_acc(Pred, P, catch process_info(P), A) - end, - [], - Pids), - sep(0 < length(Procs)), - lists:foldl(fun(T,N) -> p(T), sep(), N+1 end, 0, Procs). - -procs_acc(_, Pid, undefined, Acc) -> %% dead - [[{pid, Pid}] | Acc]; -procs_acc(Pred, Pid, Info, Acc) - when is_list(Info) -> - p_acc(Pred(Pid, Info), Pid, Info, Acc); -procs_acc(_, _, _, Acc) -> - Acc. - -p_acc(true, Pid, Info, Acc) -> - [[{pid, Pid} | Info] | Acc]; -p_acc(false, _, _, Acc) -> - Acc. - -%% info/3 - -info(Pred, Info, T) -> - lists:any(fun(I) -> i(Pred, I, T) end, Info). - -i(Pred, {K, {M,_,_}}, T) - when K == current_function; - K == initial_call -> - Pred(M,T); -i(Pred, {registered_name, N}, T) -> - Pred(N,T); -i(_,_,_) -> - false. - -pre1(A, Pre) -> - lists:prefix(Pre, atom_to_list(A)). - -pre(A, Prefixes) -> - lists:any(fun(P) -> pre1(A, atom_to_list(P)) end, Prefixes). - -%%% ---------------------------------------------------------- -%%% # latest(Modules|Prefix) -%%% -%%% Output: {Mod, {Y,M,D,HH,MM,SS}, Version} -%%% -%%% Description: Return the compile time of the most recently compiled -%%% module from the specified non-empty list. The modules -%%% are assumed to exist. -%%% ---------------------------------------------------------- - -latest(Prefix) - when is_atom(Prefix) -> - latest(modules(Prefix)); - -latest([_|_] = Modules) -> - {Mod, T} - = hd(lists:sort(fun latest/2, lists:map(fun compile_time/1, Modules))), - {Mod, T, app_vsn(Mod)}. - -app_vsn(Mod) -> - keyfetch(app_vsn, Mod:module_info(attributes)). - -compile_time(Mod) -> - T = keyfetch(time, Mod:module_info(compile)), - {Mod, T}. - -latest({_,T1},{_,T2}) -> - T1 > T2. - -%%% ---------------------------------------------------------- -%%% version_info(Modules|Prefix) -%%% -%%% Output: {SysInfo, OSInfo, [ModInfo]} -%%% -%%% SysInfo = {Arch, Vers} -%%% OSInfo = {Vers, {Fam, Name}} -%%% ModInfo = {Vsn, AppVsn, Time, CompilerVsn} -%%% ---------------------------------------------------------- - -version_info(Prefix) - when is_atom(Prefix) -> - version_info(modules(Prefix)); - -version_info(Mods) - when is_list(Mods) -> - {sys_info(), os_info(), [{M, mod_version_info(M)} || M <- Mods]}. - -mod_version_info(Mod) -> - try - Info = Mod:module_info(), - [[Vsn], AppVsn] = get_values(attributes, [vsn, app_vsn], Info), - [Ver, Time] = get_values(compile, [version, time], Info), - [Vsn, AppVsn, Ver, Time] - catch - _:_ -> - [] - end. - -get_values(Attr, Keys, Info) -> - As = proplists:get_value(Attr, Info), - [proplists:get_value(K, As, "?") || K <- Keys]. - -sys_info() -> - [A,V] = [chomp(erlang:system_info(K)) || K <- [system_architecture, - system_version]], - {A,V}. - -os_info() -> - {os:version(), os:type()}. - -chomp(S) -> - string:strip(S, right, $\n). - -print_sys_info({Arch, Ver}) -> - io:format("System info:~n" - " architecture : ~s~n" - " version : ~s~n", - [Arch, Ver]). - -print_os_info({Vsn, {Fam, Name}}) -> - io:format("OS info:~n" - " family : ~s ~s~n" - " version : ~s~n", - [str(Fam), bkt(str(Name)), vsn(Vsn)]). - -print_mod_info(Mods) -> - io:format("Module info:~n", []), - lists:foreach(fun print_mod/1, Mods). - -print_mod({Mod, []}) -> - io:format(" ~w:~n", [Mod]); -print_mod({Mod, [Vsn, AppVsn, Ver, {Year, Month, Day, Hour, Min, Sec}]}) -> - Time = io_lib:format("~w-~2..0w-~2..0w ~2..0w:~2..0w:~2..0w", - [Year, Month, Day, Hour, Min, Sec]), - io:format(" ~w:~n" - " vsn : ~s~n" - " app_vsn : ~s~n" - " compiled : ~s~n" - " compiler : ~s~n", - [Mod, str(Vsn), str(AppVsn), Time, Ver]). - -str(A) - when is_atom(A) -> - atom_to_list(A); -str(S) - when is_list(S) -> - S; -str(T) -> - io_lib:format("~p", [T]). - -bkt("" = S) -> - S; -bkt(S) -> - [$[, S, $]]. - -vsn(T) when is_tuple(T) -> - case [[$., integer_to_list(N)] || N <- tuple_to_list(T)] of - [[$.,S] | Rest] -> - [S | Rest]; - [] = S -> - S - end; -vsn(T) -> - str(T). - -%%% ---------------------------------------------------------- -%%% ---------------------------------------------------------- - -%% p/1 - -p(Info) -> - W = 2 + widest([K || {K,_} <- Info]), - lists:foreach(fun({K,V}) -> p(W,K,V) end, Info). - -p(Width, Key, Value) -> - io:format(": ~*s: ~p~n", [-Width, Key, Value]). - -%% sep/[01] - -sep() -> - sep($#). - -sep(true) -> - sep(); -sep(false) -> - ok; - -sep(Ch) -> - io:format("~c~65c~n", [Ch, $-]). - -%% widest/1 - -widest(List) -> - lists:foldl(fun widest/2, 0, List). - -widest(T, Max) - when is_atom(T) -> - widest(atom_to_list(T), Max); - -widest(T, Max) - when is_integer(T) -> - widest(integer_to_list(T), Max); - -widest(T, Max) - when is_list(T) -> %% string - max(length(T), Max). - -pt(T) -> - io:format(": ~p~n", [T]). - -recsplit(SFun, Rec) -> - fun(Fs,Vs) -> SFun(element(1, Rec), Fs, Vs) end. - -max(A, B) -> - if A > B -> A; true -> B end. - -keyfetch(Key, List) -> - {Key,V} = lists:keyfind(Key, 1, List), - V. - -%% ft/4 - -ft(undefined = No, _, _, _) -> - No; - -ft(_, Table, SFun, Fields) -> - ets:foldl(fun(R,A) -> - f(SFun, 0, Fields, R, A) - end, - 0, - Table). - -%% f/5 - -f(SFun, Width, Fields, Rec, Count) -> - ff(SFun, Width, fields(Fields, Rec), Rec, Count). - -ff(SFun, Width, Fields, Rec, Count) -> - sep(0 == Count), - f(SFun, Width, Fields, Rec), - sep(), - Count+1. - -fields(N, _) - when is_integer(N), N >= 0 -> - lists:duplicate(N, ''); %% list values unadorned -fields(Fields, R) - when is_function(Fields, 1) -> - fields(Fields(R), R); -fields({Fields, Values} = T, _) - when length(Fields) == length(Values) -> - T; -fields(Fields, _) - when is_list(Fields) -> - Fields. %% list field/value pairs, or tuples if [] - -%% f/4 - -%% Empty fields list: just print the entry. -f(_, _, [], Rec) - when is_tuple(Rec) -> - pt(Rec); - -%% Otherwise list field names/values. -f(SFun, Width, {Fields, Values}, _) -> - f(SFun, Width, Fields, Values); - -f(SFun, Width, Fields, Rec) - when is_tuple(Rec) -> - f(SFun, Width, Fields, values(Fields, Rec)); - -f(_, _, [], []) -> - ok; - -f(SFun, Width, [HF | _] = Fields, Values) -> - {F, FT, V, VT} = SFun(Fields, Values), - if is_list(F) -> %% V is a record - break($>, HF), - f(SFun, Width, F, values(F,V)), - break($<, HF), - f(SFun, Width, FT, VT); - F == '' -> %% no field name: just list value - pt(V), - f(SFun, Width, FT, VT); - true -> %% list field/value. - W = max(Width, 1 + widest(Fields)), - p(W, F, V), - f(SFun, W, FT, VT) - end. - -values(Fields, Rec) - when length(Fields) == size(Rec) - 1 -> - ?VALUES(Rec); -values(Fields, T) - when length(Fields) == size(T) -> - tuple_to_list(T). - -%% format_local/2 - -format_local(Tables, SFun) -> - lists:foldl(fun(T,A) -> fl(SFun, T, A) end, 0, Tables). - -fl(SFun, {Table, Recs, Fields}, Count) -> - sep(), - io:format("# ~p~n", [Table]), - N = fmt(Recs, Fields, SFun), - sep(0 == N), - Count + N; - -fl(SFun, {Table, Fields}, Count) -> - fl(SFun, {Table, Table, Fields}, Count). - -%% fmt/3 - -fmt(T, Fields, SFun) -> - case format(T, Fields, SFun) of - undefined -> - 0; - N -> - N - end. - -%% break/2 - -break(C, T) -> - io:format("~c ~p~n", [C, T]). - -%% collect/2 -%% -%% Output: {[{TableName, Recs}, ...], node()} - -collect(CFun, TableNames) -> - {lists:foldl(fun(N,A) -> c(CFun, N, A) end, [], TableNames), node()}. - -c(CFun, TableName, Acc) -> - case CFun(TableName) of - Recs when is_list(Recs) -> - [{TableName, Recs} | Acc]; - _ -> - Acc - end. - -%% format_remote/3 - -format_remote(Tables, SFun, {Replies, BadNodes}) -> - N = lists:foldl(fun(T,A) -> fr(Tables, SFun, T, A) end, - 0, - Replies), - sep(0 == N andalso [] /= BadNodes), - lists:foreach(fun(Node) -> io:format("# no reply from ~p~n", [Node]) end, - BadNodes), - sep([] /= BadNodes), - N. - -fr(Tables, SFun, {List, Node}, Count) - when is_list(List) -> %% guard against {badrpc, Reason} - lists:foldl(fun({T,Recs}, C) -> fr(Tables, SFun, Node, T, Recs,C) end, - Count, - List); -fr(_, _, _, Count) -> - Count. - -fr(Tables, SFun, Node, Table, Recs, Count) -> - Fields = keyfetch(Table, Tables), - sep(), - io:format("# ~p@~p~n", [Table, Node]), - N = format(Recs, Fields, tblsplit(SFun, Table)), - sep(0 == N), - Count + N. - -tblsplit(SFun, Table) - when is_function(SFun, 3) -> - fun(Fs,Vs) -> SFun(Table, Fs, Vs) end; -tblsplit(SFun, _) - when is_function(SFun, 2) -> - SFun. - -%% compact/1 -%% -%% Strip whitespace from both ends of a string. - -compact(Str) -> - compact(Str, true). - -compact([Ch|Rest], B) - when Ch == $\n; - Ch == $ ; - Ch == $\t; - Ch == $\v; - Ch == $\r -> - compact(Rest, B); - -compact(Str, false) -> - Str; - -compact(Str, true) -> - lists:reverse(compact(lists:reverse(Str), false)). |