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Snapshot testing tool using familiar assertions
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lib/mneme/assertion/pattern.ex
defmodule Mneme.Assertion.Pattern do
@moduledoc false
alias __MODULE__
@enforce_keys [:expr]
defstruct [:expr, guard: nil, notes: []]
@type t :: %Pattern{
expr: term(),
guard: Macro.t() | nil,
notes: [String.t()]
}
@doc """
Creates a new pattern.
"""
def new(expr, other_attrs \\ []) do
struct(Pattern, Keyword.put(other_attrs, :expr, expr))
end
@doc """
Combines a list of patterns into a single list pattern.
"""
def combine(patterns) when is_list(patterns) do
{exprs, {guard, notes}} =
Enum.map_reduce(
patterns,
{nil, []},
fn %Pattern{expr: expr, guard: g1, notes: n1}, {g2, n2} ->
{expr, {combine_guards(g1, g2), n1 ++ n2}}
end
)
Pattern.new(exprs, guard: guard, notes: notes)
end
defp combine_guards(nil, guard), do: guard
defp combine_guards(guard, nil), do: guard
defp combine_guards(g1, {_, meta, _} = g2), do: {:and, meta, [g2, g1]}
end