37 lines
1.1 KiB
Elixir
37 lines
1.1 KiB
Elixir
defmodule RDF.NQuads.Decoder do
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@moduledoc false
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use RDF.Serialization.Decoder
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import RDF.Serialization.ParseHelper, only: [error_description: 1]
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alias RDF.{Dataset, Graph}
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@impl RDF.Serialization.Decoder
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@spec decode(String.t(), keyword | map) :: {:ok, Graph.t() | Dataset.t()} | {:error, any}
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def decode(content, _opts \\ []) do
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with {:ok, tokens, _} <- tokenize(content),
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{:ok, ast} <- parse(tokens) do
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{:ok, build_dataset(ast)}
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else
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{:error, {error_line, :ntriples_lexer, error_descriptor}, _error_line_again} ->
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{:error,
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"N-Quad scanner error on line #{error_line}: #{error_description(error_descriptor)}"}
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{:error, {error_line, :nquads_parser, error_descriptor}} ->
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{:error,
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"N-Quad parser error on line #{error_line}: #{error_description(error_descriptor)}"}
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end
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end
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defp tokenize(content), do: content |> to_charlist |> :ntriples_lexer.string()
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defp parse(tokens), do: tokens |> :nquads_parser.parse()
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defp build_dataset(ast) do
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Enum.reduce(ast, RDF.Dataset.new(), fn quad, dataset ->
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RDF.Dataset.add(dataset, quad)
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end)
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end
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end
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