87 lines
3.9 KiB
Elixir
87 lines
3.9 KiB
Elixir
defmodule JSON.LD.IRIExpansion do
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import JSON.LD.Utils
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@keywords JSON.LD.keywords # to allow this to be used in function guard clauses, we redefine this here
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@doc """
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see http://json-ld.org/spec/latest/json-ld-api/#iri-expansion
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"""
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def expand_iri(value, active_context, doc_relative \\ false, vocab \\ false,
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local_context \\ nil, defined \\ nil)
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# 1) If value is a keyword or null, return value as is.
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def expand_iri(value, active_context, _, _, local_context, defined)
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when is_nil(value) or value in @keywords do
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if local_context || defined do
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{value, active_context, defined}
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else
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value
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end
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end
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def expand_iri(value, active_context, doc_relative, vocab, local_context, defined) do
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# 2)
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{active_context, defined} =
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if local_context && local_context[value] && defined[value] != true do
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local_def = local_context[value]
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JSON.LD.Context.create_term_definition(
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active_context, local_context, value, local_def, defined)
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else
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{active_context, defined}
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end
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{result, active_context, defined} =
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cond do
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# 3) If vocab is true and the active context has a term definition for value, return the associated IRI mapping.
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vocab && Map.has_key?(active_context.term_defs, value) ->
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result = (term_def = active_context.term_defs[value]) && term_def.iri_mapping
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{result, active_context, defined}
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# 4) If value contains a colon (:), it is either an absolute IRI, a compact IRI, or a blank node identifier
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String.contains?(value, ":") ->
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case compact_iri_parts(value) do
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[prefix, suffix] ->
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# 4.3)
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{active_context, defined} =
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if local_context && local_context[prefix] && defined[prefix] != true do
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local_def = local_context[prefix]
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JSON.LD.Context.create_term_definition(
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active_context, local_context, prefix, local_def, defined)
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else
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{active_context, defined}
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end
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# 4.4)
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result =
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if prefix_def = active_context.term_defs[prefix] do
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prefix_def.iri_mapping <> suffix
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else
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value # 4.5)
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end
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{result, active_context, defined}
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nil ->
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{value, active_context, defined} # 4.2)
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end
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# 5) If vocab is true, and active context has a vocabulary mapping, return the result of concatenating the vocabulary mapping with value.
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vocab && active_context.vocab ->
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vocabulary_mapping = active_context.vocab
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{vocabulary_mapping <> value, active_context, defined}
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# 6) Otherwise, if document relative is true, set value to the result of resolving value against the base IRI. Only the basic algorithm in section 5.2 of [RFC3986] is used; neither Syntax-Based Normalization nor Scheme-Based Normalization are performed. Characters additionally allowed in IRI references are treated in the same way that unreserved characters are treated in URI references, per section 6.5 of [RFC3987].
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doc_relative ->
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{absolute_iri(value, JSON.LD.Context.base(active_context)), active_context, defined}
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# TODO: RDF.rb's implementation differs from the spec here, by checking if base_iri is actually present in the previous clause and adding the following additional clause. Another Spec error?
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# if local_context && RDF::URI(value).relative?
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# # If local context is not null and value is not an absolute IRI, an invalid IRI mapping error has been detected and processing is aborted.
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# raise JSON.LD.InvalidIRIMappingError, message: "not an absolute IRI: #{value}"
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# 7) Return value as is.
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true ->
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{value, active_context, defined}
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end
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if local_context do
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{result, active_context, defined}
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else
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result
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end
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end
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end
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