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A simple easy to debug macro free peg parser library

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minipeg lib minipeg failure.ex
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lib/minipeg/failure.ex 

defmodule Minipeg.Failure do

  alias Minipeg.{Cache, Input}

  use Minipeg.Types



  @moduledoc ~S"""

  A failure result

  """



  defstruct cache: %Cache{}, input: %Input{}, parsed_by: "", reason: ""



  @type t :: %__MODULE__{cache: Cache.t(), input: Input.t(), parsed_by: binary(), reason: binary()}



  @spec fail(binary(), Input.t(), Cache.t(), binary()) :: t

  def fail(reason, input, cache, parsed_by \\ "") do

    %__MODULE__{cache: cache, input: input, parsed_by: parsed_by, reason: reason}

  end



  @spec format(t()) :: binary()

  def format(%__MODULE__{input: input} = failure) do

    source_name = Map.get(input, :context, %{})

             |> Map.get(:source_name, "<binary>")

    "#{error_message(failure)} in #{source_name}:#{Input.report_position(input)}"

  end



  @spec error_message(t()) :: binary()

  def error_message(f)

  def error_message(%__MODULE__{parsed_by: ""} = f) do

    f.reason

  end

  def error_message(%__MODULE__{} = f) do

    "#{f.reason} (in #{f.parsed_by})"

  end



  @spec reset_error(t(), binary?(), binary?()) :: t()

  def reset_error(f, reason, parser_name \\ nil) do

    %{f|parsed_by: parser_name || f.parsed_by, reason: reason || f.reason}

  end

end

# SPDX-License-Identifier: Apache-2.0