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ewoc_generate_data.erl
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/
ewoc_generate_data.erl
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-module(ewoc_generate_data).
-define(ALLOWED_CHAR, "ABCDEFGHIJKLMNOPQRSTUVWXYZ").
-export([binary/1, string/1, integer/1, list/1]).
-type proplist(K,V) :: [{K, V}].
binary(Actions) ->
to_binary(do_actions(Actions, [])).
string(_) ->
"".
integer(Actions) ->
do_actions(Actions, []).
list(Actions) ->
do_actions(Actions, []).
-spec do_actions(proplist(atom(), Option), Acc :: list) -> Answer when
Option :: proplist(atom(), proplist(atom(), list())) |
integer(),
Answer :: integer() | list().
do_actions([], Answer) ->
Answer;
do_actions([{Action, Option}|T], Acc) ->
case Action of
words ->
Words = words(Option, []),
do_actions(T, [Words|Acc]);
rand ->
{A1, A2, A3} = now(),
random:seed(A1,A2,A3),
random:uniform(Option);
seq ->
{Start, End} = Option,
lists:seq(Start, End)
end.
-spec words(list(), list()) -> list().
words([], Acc) ->
string:join(Acc, " ");
words([H|T], Acc) ->
Word = do_options(H),
words(T, Word).
-spec random_chars(Length, AllowedChars) -> list() when
Length :: integer(),
AllowedChars :: integer().
random_chars(Length, AllowedChars) ->
lists:foldl(fun(_, Acc) ->
[lists:nth(random:uniform(length(AllowedChars)),
AllowedChars) | Acc]
end, [], lists:seq(1, Length)).
-spec create_word(N :: integer()) -> list().
create_word(N) ->
random_chars(N, string:to_lower(?ALLOWED_CHAR) ++ ?ALLOWED_CHAR).
-spec do_options(tuple()) -> list().
do_options({Action, Option}) ->
case Action of
wsize ->
[create_word(X) || X<-Option]
end.
-spec to_binary(Value) -> binary() when
Value :: integer(),
Value :: list().
to_binary(Value) when is_integer(Value) ->
list_to_binary(integer_to_list(Value));
to_binary(Value) when is_list(Value) ->
list_to_binary(Value).