29 lines
1 KiB
Elixir
29 lines
1 KiB
Elixir
defmodule RDF.URI.Helper do
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@moduledoc """
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Some helpers functions for working with URIs.
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These functions should be part of a dedicated RDF.IRI implementation.
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"""
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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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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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_ when is_nil(base_iri) -> nil
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_ -> URI.merge(base_iri, value)
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end
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end
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end
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