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hl7v2
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0.1.0
Pure Elixir HL7 v2.x toolkit — schema-driven parsing, typed segments, message builder, MLLP transport
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lib/hl7v2/type/si.ex
defmodule HL7v2.Type.SI do
@moduledoc """
Sequence ID (SI) -- HL7v2 primitive data type.
Non-negative integer, range 0-9999. Used as sequential counter
within repeating structures (e.g., Set ID fields).
"""
@behaviour HL7v2.Type
@doc """
Parses a sequence ID string into an integer.
Returns `nil` for empty/nil input. Only valid non-negative integers
are accepted (range 0-9999).
## Examples
iex> HL7v2.Type.SI.parse("1")
1
iex> HL7v2.Type.SI.parse("0")
0
iex> HL7v2.Type.SI.parse("9999")
9999
iex> HL7v2.Type.SI.parse("")
nil
iex> HL7v2.Type.SI.parse(nil)
nil
"""
@spec parse(binary() | nil) :: non_neg_integer() | nil
def parse(nil), do: nil
def parse(""), do: nil
def parse(value) when is_binary(value) do
case Integer.parse(String.trim(value)) do
{n, ""} when n >= 0 and n <= 9999 -> n
_ -> nil
end
end
@doc """
Encodes a sequence ID integer to a string.
## Examples
iex> HL7v2.Type.SI.encode(1)
"1"
iex> HL7v2.Type.SI.encode(nil)
""
"""
@spec encode(non_neg_integer() | nil) :: binary()
def encode(nil), do: ""
def encode(value) when is_integer(value) and value >= 0, do: Integer.to_string(value)
end