34 lines
1.1 KiB
Elixir
34 lines
1.1 KiB
Elixir
defmodule RDF.NTriples.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.Graph
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@impl RDF.Serialization.Decoder
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@spec decode(String.t(), keyword) :: {:ok, Graph.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_graph(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-Triple scanner error on line #{error_line}: #{error_description(error_descriptor)}"}
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{:error, {error_line, :ntriples_parser, error_descriptor}} ->
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{:error,
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"N-Triple 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 |> :ntriples_parser.parse()
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defp build_graph(ast) do
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Enum.reduce(ast, Graph.new(), &Graph.add(&2, &1))
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end
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end
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