33baa99aae
* [WIP] break out a few contexts, start refactoring fast index modules * [WIP] more contexts, this time around slow indexing and downloads * [WIP] got all tests passing * [WIP] Added moduledocs * Built a genserver to rename old jobs on boot * Added a module naming check; moved things around * Fixed specs
42 lines
1.3 KiB
Elixir
42 lines
1.3 KiB
Elixir
defmodule Pinchflat.Downloading.OutputPath.Parser do
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@moduledoc """
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Parses liquid-ish-style strings into a rendered string
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Used for turning filepath templates into real filepaths
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"""
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use Pinchflat.Downloading.OutputPath.Base
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@doc """
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Parses a string into a rendered string, using the provided variables. Optionally
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takes a custom fetcher function for handling missing variables.
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Variable identifiers are surrounded by {{ and }}. The variable keys MUST be strings.
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If an identifier is not found in the provided variables, it will be removed from the string.
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Returns `{:ok, binary()}` or `{:error, binary()}`.
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"""
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def parse(string, variables, value_fetch_fn \\ &default_fetcher/2) do
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# `do_parse` comes from `RenderedString.Base`
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case do_parse(string) do
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{:ok, parsed, _, _, _, _} ->
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{:ok, build_string(parsed, variables, value_fetch_fn)}
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{:error, message, _, _, _, _} ->
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{:error, message}
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end
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end
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defp build_string(parsed, variables, value_fetch_fn) do
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Enum.reduce(parsed, "", fn element, acc ->
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case element do
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{:text, text} -> acc <> text
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{:interpolation, {:identifier, identifier}} -> acc <> value_fetch_fn.(identifier, variables)
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end
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end)
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end
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def default_fetcher(identifier, variables) do
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Map.get(variables, identifier, "")
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end
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end
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