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A declarative, extensible framework for building Elixir applications.

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ash lib ash query boolean_expression.ex
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lib/ash/query/boolean_expression.ex

defmodule Ash.Query.BooleanExpression do
@moduledoc "Represents a boolean expression"
@dialyzer {:nowarn_function, optimized_new: 4}
alias Ash.Query.Operator.{Eq, In, NotEq}
alias Ash.Query.Ref
defstruct [:op, :left, :right]
def new(_, nil, nil), do: nil
def new(_, left, nil), do: left
def new(_, nil, right), do: right
def new(op, left, right) do
%__MODULE__{op: op, left: left, right: right}
end
def optimized_new(op, left, right, current_op \\ :and)
def optimized_new(_, nil, nil, _), do: nil
def optimized_new(:and, false, _, _), do: false
def optimized_new(:and, _, false, _), do: false
def optimized_new(:or, true, _, _), do: true
def optimized_new(:or, _, true, _), do: true
def optimized_new(_, nil, right, _), do: right
def optimized_new(_, left, nil, _), do: left
def optimized_new(
op,
%__MODULE__{op: op} = left_expr,
%__MODULE__{
op: op,
left: left,
right: right
},
op
) do
optimized_new(op, optimized_new(op, left_expr, left, op), right, op)
end
def optimized_new(op, %__MODULE__{} = left, %__MODULE__{} = right, _) do
do_new(op, left, right)
end
def optimized_new(op, left, %__MODULE__{} = right, current_op) do
optimized_new(op, right, left, current_op)
end
def optimized_new(op, %In{} = left, %NotEq{} = right, current_op) do
optimized_new(op, right, left, current_op)
end
def optimized_new(op, %In{} = left, %Eq{} = right, current_op) do
optimized_new(op, right, left, current_op)
end
def optimized_new(op, %Eq{right: %Ref{}} = left, right, _) do
do_new(op, left, right)
end
def optimized_new(op, left, %Eq{right: %Ref{}} = right, _) do
do_new(op, left, right)
end
def optimized_new(op, %NotEq{right: %Ref{}} = left, right, _) do
do_new(op, left, right)
end
def optimized_new(op, left, %NotEq{right: %Ref{}} = right, _) do
do_new(op, left, right)
end
def optimized_new(
:or,
%Eq{left: left, right: value},
%In{left: left, right: %{__struct__: MapSet} = mapset} = right,
_
) do
%{right | right: MapSet.put(mapset, value)}
end
def optimized_new(
:or,
%NotEq{left: left, right: value},
%In{left: left, right: %{__struct__: MapSet} = mapset} = right,
_
) do
without = MapSet.delete(mapset, value)
case MapSet.size(without) do
0 -> false
1 -> %Eq{left: left, right: Enum.at(without, 0)}
_ -> %{right | right: without}
end
end
def optimized_new(
:and,
%Eq{left: left, right: value} = left_expr,
%In{left: left, right: %{__struct__: MapSet} = mapset},
_
) do
if MapSet.member?(mapset, value) do
left_expr
else
false
end
end
def optimized_new(
:and,
%NotEq{left: left, right: value},
%In{left: left, right: %{__struct__: MapSet} = mapset} = right_expr,
_
) do
if MapSet.member?(mapset, value) do
false
else
right_expr
end
end
def optimized_new(
op,
%NotEq{} = left,
%Eq{} = right,
current_op
) do
optimized_new(op, right, left, current_op)
end
def optimized_new(
:or,
%Eq{left: left, right: left_value},
%Eq{left: left, right: right_value},
_
) do
%In{left: left, right: MapSet.new([left_value, right_value])}
end
def optimized_new(
:or,
%NotEq{left: left, right: left_value},
%Eq{left: left, right: right_value} = right_expr,
_
)
when left_value != right_value do
right_expr
end
def optimized_new(
:or,
%NotEq{left: left, right: left_value},
%Eq{left: left, right: right_value},
_
)
when left_value == right_value do
true
end
def optimized_new(
:and,
%Eq{left: left, right: left_value} = left_expr,
%Eq{left: left, right: right_value},
_
) do
if left_value == right_value do
left_expr
else
false
end
end
def optimized_new(
:and,
%NotEq{left: left, right: left_value} = left_expr,
%NotEq{left: left, right: right_value},
_
)
when left_value == right_value do
left_expr
end
def optimized_new(
:or,
%In{left: left, right: left_values},
%In{left: left, right: right_values} = right,
_
) do
%{right | right: MapSet.union(left_values, right_values)}
end
def optimized_new(
:and,
%In{left: left, right: left_values},
%In{left: left, right: right_values} = right,
_
) do
intersection = MapSet.intersection(left_values, right_values)
case MapSet.size(intersection) do
0 -> false
1 -> %Eq{left: left, right: Enum.at(intersection, 0)}
_ -> %{right | right: intersection}
end
end
def optimized_new(
op,
%__MODULE__{left: left, right: right} = left_expr,
right_expr,
op
) do
case right_expr do
%In{} = in_op ->
with {:left, nil} <- {:left, Ash.Filter.find(left, &simplify?(&1, in_op))},
{:right, nil} <- {:right, Ash.Filter.find(right, &simplify?(&1, in_op))} do
do_new(op, left_expr, in_op)
else
{:left, _} ->
%{left_expr | left: optimized_new(:or, left, in_op)}
{:right, _} ->
%{left_expr | right: optimized_new(:or, right, in_op)}
end
%Eq{} = eq_op ->
with {:left, nil} <- {:left, Ash.Filter.find(left, &simplify?(&1, eq_op))},
{:right, nil} <- {:right, Ash.Filter.find(right, &simplify?(&1, eq_op))} do
do_new(op, left_expr, eq_op)
else
{:left, _} ->
%{left_expr | left: optimized_new(:or, left, eq_op)}
{:right, _} ->
%{left_expr | right: optimized_new(:or, right, eq_op)}
end
_ ->
do_new(op, left_expr, right_expr)
end
end
def optimized_new(op, left, right, _) do
# TODO: more optimization passes!
# Remove predicates that are on both sides of an `and`
# if a predicate is on both sides of an `or`, lift it to an `and`
do_new(op, left, right)
end
defp simplify?(%NotEq{} = left, %In{} = right), do: simplify?(right, left)
defp simplify?(%NotEq{} = left, %Eq{} = right), do: simplify?(right, left)
defp simplify?(%Eq{} = left, %In{} = right), do: simplify?(right, left)
defp simplify?(%Eq{right: %Ref{}}, _), do: false
defp simplify?(_, %Eq{right: %Ref{}}), do: false
defp simplify?(%Eq{left: left}, %Eq{left: left}), do: true
defp simplify?(%NotEq{right: %Ref{}}, _), do: false
defp simplify?(_, %NotEq{right: %Ref{}}), do: false
defp simplify?(%NotEq{left: left}, %NotEq{left: left}), do: true
defp simplify?(
%Eq{left: left},
%In{left: left, right: %MapSet{}}
),
do: true
defp simplify?(
%NotEq{left: left},
%In{left: left, right: %MapSet{}}
),
do: true
defp simplify?(
%Eq{left: left},
%NotEq{left: left, right: %MapSet{}}
),
do: true
defp simplify?(_, _), do: false
defp do_new(op, left, right) do
if left == right do
left
else
%__MODULE__{
op: op,
left: left,
right: right
}
end
end
end
defimpl Inspect, for: Ash.Query.BooleanExpression do
import Inspect.Algebra
def inspect(
%{left: left, right: right, op: op},
opts
) do
container_type = container_type(opts)
opts = put_container_type(opts, op)
if container_type && op != container_type do
concat(["(", to_doc(left, opts), " ", to_string(op), " ", to_doc(right, opts), ")"])
else
concat([to_doc(left, opts), " ", to_string(op), " ", to_doc(right, opts)])
end
end
# custom options not available before Elixir 1.9
defp container_type(%{custom_options: options}), do: options[:container_type]
defp container_type(_), do: nil
defp put_container_type(opts, container_type) do
custom_options = apply(Map, :get, [opts, :custom_options])
apply(Map, :put, [
opts,
:custom_options,
Keyword.put(custom_options, :container_type, container_type)
])
# above version required to avoid dialyzer warnings on lack of custom_options in pre-1.9 elixir
# %{opts | custom_options: Keyword.put(opts.custom_options, :container_type, container_type)}
end
end