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surgex lib surgex parser parsers page_parser.ex
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lib/surgex/parser/parsers/page_parser.ex

defmodule Surgex.Parser.PageParser do
@moduledoc false
alias Surgex.Parser.IntegerParser
def call(nil), do: {:ok, nil}
def call(input) when is_binary(input) do
with {:ok, integer} when integer > 0 <- IntegerParser.call(input) do
{:ok, integer}
else
{:ok, _invalid_integer} -> {:error, :invalid_page}
{:error, reason} -> {:error, reason}
end
end
end