78 lines
2.5 KiB
Elixir
78 lines
2.5 KiB
Elixir
defmodule JSON.LD.Utils do
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@doc """
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Resolves a relative IRI against a base IRI.
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as specified in [section 5.1 Establishing a Base URI of RFC3986](http://tools.ietf.org/html/rfc3986#section-5.1).
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Only the basic algorithm in [section 5.2 of RFC3986](http://tools.ietf.org/html/rfc3986#section-5.2)
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is used; neither Syntax-Based Normalization nor Scheme-Based Normalization are performed.
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Characters additionally allowed in IRI references are treated in the same way that unreserved
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characters are treated in URI references, per [section 6.5 of RFC3987](http://tools.ietf.org/html/rfc3987#section-6.5)
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"""
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# TODO: This should be part of a dedicated URI/IRI implementation and properly tested.
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def absolute_iri(value, base_iri)
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def absolute_iri(value, nil), do: value
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def absolute_iri(value, base_iri) do
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case URI.parse(value) do
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# absolute?
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uri = %URI{scheme: scheme} when not is_nil(scheme) -> uri
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# relative
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_ ->
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URI.merge(base_iri, value)
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end
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|> to_string
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end
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@doc """
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Checks if the given value is an absolute IRI.
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An absolute IRI is defined in [RFC3987](http://www.ietf.org/rfc/rfc3987.txt)
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containing a scheme along with a path and optional query and fragment segments.
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see <https://www.w3.org/TR/json-ld-api/#dfn-absolute-iri>
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"""
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# TODO: This should be part of a dedicated URI/IRI implementation and properly tested.
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def absolute_iri?(value), do: RDF.uri?(value)
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def compact_iri_parts(compact_iri, exclude_bnode \\ true) do
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with [prefix, suffix] when not(binary_part(suffix, 0, 2) == "//") and
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not(exclude_bnode and prefix == "_") <-
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String.split(compact_iri, ":", parts: 2) do
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[prefix, suffix]
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else
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_ -> nil
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end
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end
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@doc """
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Checks if the given value is a blank node identifier.
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A blank node identifier is a string that can be used as an identifier for a
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blank node within the scope of a JSON-LD document.
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Blank node identifiers begin with `_:`
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see <https://www.w3.org/TR/json-ld-api/#dfn-blank-node-identifier>
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"""
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def blank_node_id?("_:" <> _), do: true
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def blank_node_id?(_), do: false
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def scalar?(value) when is_binary(value) or is_number(value) or
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is_boolean(value), do: true
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def scalar?(_), do: false
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def list?(%{"@list" => _}), do: true
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def list?(_), do: false
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def index?(%{"@index" => _}), do: true
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def index?(_), do: false
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def value?(%{"@value" => _}), do: true
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def value?(_), do: false
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end
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