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0.1.1
A SMPTE timecode library for Elixir
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lib/utils/parse.ex
defmodule Vtc.Utils.Parse do
@moduledoc false
alias Vtc.Timecode
@doc """
Applies regex and returns the appropriate error when not correct.
"""
@spec apply_regex(Regex.t(), String.t()) :: {:ok, map()} | {:error, Timecode.ParseError.t()}
def apply_regex(regex, value) do
regex
|> Regex.named_captures(value)
|> then(fn
matched when is_map(matched) -> {:ok, matched}
nil -> {:error, %Timecode.ParseError{reason: :unrecognized_format}}
end)
end
@doc """
Extracts a set of sections in a time string of format xx:yy:.. that may or may not
be truncated at the head.
The regex matches are expected to have a series of fields like "section_1",
"section_2", etc that denote present sections whose meaning depends on the number
of sections present.
"""
@spec extract_time_sections(map(), non_neg_integer()) :: [String.t()]
def extract_time_sections(regex_matches, section_count) do
1..section_count
|> Enum.map(&Integer.to_string/1)
|> Enum.reduce([], fn section_index, sections ->
case Map.fetch!(regex_matches, "section_#{section_index}") do
"" -> sections
this_section -> [this_section | sections]
end
end)
end
@doc """
Pops the next section at the end of the list and returns it as an integer.
Returns `0` if the value is not present
"""
@spec pop_time_section([String.t()]) :: {integer(), [String.t()]}
def pop_time_section(["" | remaining]), do: {0, remaining}
def pop_time_section([value | remaining]), do: {String.to_integer(value), remaining}
def pop_time_section([]), do: {0, []}
end