63 lines
1.8 KiB
Elixir
63 lines
1.8 KiB
Elixir
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defmodule RDF.Literal do
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@moduledoc """
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RDF literals are leaf nodes of a RDF graph containing raw data, like strings and numbers.
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"""
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defstruct [:value, :datatype, :language]
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@type t :: module
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alias RDF.XSD
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defmodule InvalidLiteralError, do: defexception [:message]
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@doc """
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Creates a new `RDF.Literal` of the given value and tries to infer an appropriate XSD datatype.
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Note: The `RDF.literal` function is a shortcut to this function.
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The following mapping of Elixir types to XSD datatypes is applied:
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| Elixir type | XSD datatype |
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| :---------- | :----------- |
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| string | |
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| boolean | `boolean` |
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| integer | `integer` |
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| float | `float` |
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| atom | |
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| ... | |
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# Examples
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iex> RDF.Literal.new(42)
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%RDF.Literal{value: 42, language: nil, datatype: RDF.uri(RDF.XSD.integer)}
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"""
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def new(value)
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def new(value) when is_boolean(value),
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do: %RDF.Literal{value: value, datatype: XSD.boolean}
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def new(value) when is_integer(value),
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do: %RDF.Literal{value: value, datatype: XSD.integer}
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def new(value) when is_float(value),
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do: %RDF.Literal{value: value, datatype: XSD.float}
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# def new(value) when is_atom(value), do:
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# def new(value) when is_binary(value), do:
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# def new(value) when is_bitstring(value), do:
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# def new(value) when is_list(value), do:
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# def new(value) when is_tuple(value), do:
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# def new(value) when is_map(value), do:
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# def new(value) when is_function(value), do:
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# def new(value) when is_pid(value), do:
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# def new(value) when is_port(value), do:
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# def new(value) when is_reference(value), do:
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def new(value) do
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raise InvalidLiteralError, "#{inspect value} not convertible to a RDF.Literal"
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end
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end
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