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-module(ataxic_optimize).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% TYPES %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-include("ataxia/ataxic.hrl").
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% EXPORTS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-export([aggressive/1, light/1]).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% LOCAL FUNCTIONS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% list(..., const(a), ...) -> list(const(a), ...)
-spec remove_overridden_operations
(
list(ataxic:basic())
)
-> list(ataxic:basic()).
remove_overridden_operations (List) ->
lists:foldr
(
fun (Elem, CurrentResult) ->
case CurrentResult of
{done, _} -> CurrentResult;
{ok, List} ->
case Elem of
#const{} -> {done, [Elem|List]};
_ -> {ok, [Elem|List]}
end
end
end,
{ok, []},
List
).
% list(update_field(a, o0), update(a, o1), ...) -> update_field(a, list(o0, o1))
-spec optimize_update_field_sequence
(
list(ataxic:basic()),
list(ataxic:basic())
)
-> ataxic:basic().
optimize_update_field_sequence ([], Result) ->
case Result of
[] -> ataxic:current_value();
[A] -> A;
_ -> ataxic:sequence(Result)
end;
optimize_update_field_sequence (UnsortedOPs, CurrentResults) ->
% Get all field updates until you encounter something else
{FieldUpdates, PotentiallyImportantOPs} =
lists:splitwith(fun (E) -> is_record(E, upfield) end, UnsortedOPs),
% Sort field updates by updated field
SortedFieldUpdates =
lists:sort
(
fun (A, B) ->
((A#upfield.ix) =< (B#upfield.ix))
end,
FieldUpdates
),
% Merge all field updates that are for the same field
% LastIX, LastUpdateOPs correspond to the last field updates that should be
% merged but that were surprised by the sequence ending.
{LastIX, LastUpdateOPs, OtherMergedFieldUpdates} =
lists:foldl
(
fun (Update, {CurrentIX, CurrentOPs, CurrentResult}) ->
case (Update#upfield.ix == CurrentIX) of
true ->
{CurrentIX, [Update#upfield.op|CurrentOPs], CurrentResult};
_ ->
{
Update#upfield.ix,
[Update#upfield.op],
(
case CurrentOPs of
[] -> CurrentResult;
[OP] ->
[
ataxic:update_field(CurrentIX, OP)
|CurrentResult
];
_ ->
[
ataxic:update_field
(
CurrentIX,
ataxic:sequence(lists:reverse(CurrentOPs))
)
|CurrentResult
]
end
)
}
end
end,
{-1, [], []},
SortedFieldUpdates
),
% Add the merged LastUpdateOPs for field LastIX
MergedFieldUpdates =
(
case LastUpdateOPs of
[] -> OtherMergedFieldUpdates;
[OP] ->
[
ataxic:update_field(LastIX, OP)
|OtherMergedFieldUpdates
];
_ ->
[
ataxic:update_field
(
LastIX,
ataxic:sequence(lists:reverse(LastUpdateOPs))
)
|OtherMergedFieldUpdates
]
end
),
% Skip the OPs until we find another field update
{ImportantOPs, PotentialFieldUpdates} =
lists:splitwith
(
fun (E) -> not is_record(E, upfield) end,
PotentiallyImportantOPs
),
optimize_update_field_sequence
(
PotentialFieldUpdates,
(CurrentResults ++ MergedFieldUpdates ++ ImportantOPs)
).
-spec flatten_sequence (list(ataxic:basic())) -> list(ataxic:basic()).
flatten_sequence (OPs) ->
lists:foldl
(
fun (E, CurrentOPs) ->
case is_record(E, seq) of
true -> (E#seq.ops ++ CurrentOPs);
_ -> [E|CurrentOPs]
end
end,
[],
OPs
).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% EXPORTED FUNCTIONS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-spec aggressive
(ataxic:basic()) -> ataxic:basic();
(ataxic:meta()) -> ataxic:meta().
aggressive (In = #field{ op = OP }) ->
In#field{ op = aggressive(OP) };
aggressive (In = #upfield{ op = S0OP}) ->
S1OP = aggressive(S0OP),
case S1OP of
#current{} -> S1OP;
_ -> In#upfield{ op = S1OP }
end;
aggressive (#seq{ ops = S0OPs }) ->
S1OPs = lists:map(fun aggressive/1, S0OPs),
S2OPs = flatten_sequence(S1OPs),
S3OPs = lists:filter(fun (E) -> (not is_record(E, current)) end, S2OPs),
Result = optimize_update_field_sequence(S3OPs, []),
case Result of
#seq{ ops = S4OPs } -> #seq{ ops = remove_overridden_operations(S4OPs) };
_ -> Result
end;
aggressive (In = #apply_fun{ params = OPs }) ->
In#apply_fun
{
params = lists:map(fun aggressive/1, OPs)
};
aggressive (In = #list_cons{ param = OP }) ->
In#list_cons{ param = lists:map(fun aggressive/1, OP) };
aggressive (In = #read_perm{ op = OP }) ->
In#read_perm{ op = aggressive(OP) };
aggressive (In = #write_perm{ op = OP }) ->
In#write_perm{ op = aggressive(OP) };
aggressive (In = #lock{ op = OP }) ->
In#lock{ op = aggressive(OP) };
aggressive (In = #value{ op = OP }) ->
In#value{ op = aggressive(OP) };
aggressive (In = #mseq{ ops = OPs }) ->
In#mseq{ ops = lists:map(fun aggressive/1, OPs) };
aggressive (Other) ->
Other.
-spec light
(ataxic:basic()) -> ataxic:basic();
(ataxic:meta()) -> ataxic:meta().
light (#seq{ ops = S0OPs }) ->
S1OPs = flatten_sequence(S0OPs),
S2OPs = lists:filter(fun (E) -> (not is_record(E, current)) end, S1OPs),
Result = optimize_update_field_sequence(S2OPs, []),
Result;
light (OP) -> OP.
|
