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A data first framework for building realtime applications
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lib/riptide/store/prefix.ex
defmodule Riptide.Store.Prefix do
@moduledoc false
def range(nil, _opts), do: {[], [<<127>>]}
def range(input, opts) do
input = blank(input)
case {Map.get(opts, :min), Map.get(opts, :max)} do
{min, max} when min in ["", nil] and max in ["", nil] ->
min = [input]
max = [prefix(input)]
{min, max}
{min, max} when max in ["", nil] ->
min = [input, min]
max = [prefix(input)]
{min, max}
{min, max} when min in ["", nil] ->
min = [input]
max = [input, max]
{min, max}
{min, max} ->
min = [input, min]
max = [input, max]
{min, max}
end
end
def blank(""), do: <<0>>
def blank(input), do: input
def prefix(<<0>>) do
<<127>>
end
def prefix(<<head>>) do
<<head + 1>>
end
def prefix(<<head>> <> tail) do
<<head>> <> prefix(tail)
end
end