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A simple easy to debug macro free peg parser library

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minipeg lib minipeg mappers.ex
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lib/minipeg/mappers.ex 

defmodule Minipeg.Mappers do

  use Minipeg.Types



  @moduledoc ~S"""

  Define some useful functions for `Minipeg.Combinators.map`

  """



  @doc ~S"""

  A mapper for parsers that return not empty lists, it removes the first element from the mapper



  Ex.:

    

          sequence([

            char_parser("%"),

            some_parser()        # --> some_ast

          ]) |> map(&ignore_first/1) # --> [some_ast]



          sequence([

            char_parser("%"),

            some_parser()        # --> some_ast

            other_parser()        # --> other_ast

          ]) |> map(&ignore_first/1) # --> [some_ast, other_ast]

  """

  @spec ignore_first(ast_list_t()) :: ast_t()

  def ignore_first(ast_list)

  def ignore_first([_ | rest]), do: rest



  @doc ~S"""

  A mapper for parsers that return not empty lists, it removes the first element from the mapper

  and then flattens the rest



  Ex.:

          sequence([

            char_parser("%"),

            sequence([

            some_parser()        # --> some_ast

            other_parser()        # --> other_ast

            ])

          ]) |> map(&ignore_first/1) # --> [some_ast, other_ast] and not [[..., ...]]

  """

  @spec ignore_first_and_flatten(ast_list_t()) :: ast_list_t()

  def ignore_first_and_flatten(ast_list)

  def ignore_first_and_flatten([_ | rest]), do: rest |> List.flatten()

end



# SPDX-License-Identifier: Apache-2.0