281 lines
10 KiB
Elixir
281 lines
10 KiB
Elixir
defmodule RDF do
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@moduledoc """
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The top-level module of RDF.ex.
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RDF.ex consists of:
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- modules for the nodes of an RDF graph
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- `RDF.Term`
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- `RDF.IRI`
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- `RDF.BlankNode`
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- `RDF.Literal`
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- a facility for the mapping of URIs of a vocabulary to Elixir modules and
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functions: `RDF.Vocabulary.Namespace`
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- modules for the construction of statements
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- `RDF.Triple`
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- `RDF.Quad`
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- `RDF.Statement`
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- modules for collections of statements
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- `RDF.Description`
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- `RDF.Graph`
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- `RDF.Dataset`
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- `RDF.Data`
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- `RDF.List`
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- `RDF.Diff`
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- functions for working with RDF serializations: `RDF.Serialization`
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- behaviours for the definition of RDF serialization formats
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- `RDF.Serialization.Format`
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- `RDF.Serialization.Decoder`
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- `RDF.Serialization.Encoder`
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- and the implementation of various RDF serialization formats
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- `RDF.NTriples`
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- `RDF.NQuads`
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- `RDF.Turtle`
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This top-level module provides shortcut functions for the construction of the
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basic elements and structures of RDF and some general helper functions.
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For a general introduction you may refer to the guides on the [homepage](https://rdf-elixir.dev).
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"""
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alias RDF.{IRI, Namespace, Literal, BlankNode, Triple, Quad,
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Description, Graph, Dataset, PrefixMap}
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defdelegate default_base_iri(), to: RDF.IRI, as: :default_base
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@standard_prefixes PrefixMap.new(
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xsd: IRI.new("http://www.w3.org/2001/XMLSchema#"),
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rdf: IRI.new("http://www.w3.org/1999/02/22-rdf-syntax-ns#"),
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rdfs: IRI.new("http://www.w3.org/2000/01/rdf-schema#")
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)
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@doc """
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A fixed set prefixes that will always be part of the `default_prefixes/0`.
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```elixir
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#{inspect(@standard_prefixes, pretty: true)}
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```
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See `default_prefixes/0`, if you don't want these standard prefixes to be part
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of the default prefixes.
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"""
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def standard_prefixes(), do: @standard_prefixes
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@doc """
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A user-defined `RDF.PrefixMap` of prefixes to IRI namespaces.
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This prefix map will be used implicitly wherever a prefix map is expected, but
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not provided. For example, when you don't pass a prefix map to the Turtle serializer,
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this prefix map will be used.
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By default the `standard_prefixes/0` are part of this prefix map, but you can
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define additional default prefixes via the `default_prefixes` compile-time
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configuration.
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For example:
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config :rdf,
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default_prefixes: %{
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ex: "http://example.com/"
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}
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If you don't want the `standard_prefixes/0` to be part of the default prefixes,
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or you want to map the standard prefixes to different namespaces (strongly discouraged!),
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you can set the `use_standard_prefixes` compile-time configuration flag to `false`.
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config :rdf,
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use_standard_prefixes: false
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"""
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@default_prefixes Application.get_env(:rdf, :default_prefixes, %{}) |> PrefixMap.new()
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if Application.get_env(:rdf, :use_standard_prefixes, true) do
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def default_prefixes() do
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PrefixMap.merge!(@standard_prefixes, @default_prefixes)
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end
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else
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def default_prefixes() do
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@default_prefixes
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end
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end
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@doc """
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Returns the `default_prefixes/0` with additional prefix mappings.
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The `prefix_mappings` can be given in any format accepted by `RDF.PrefixMap.new/1`.
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"""
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def default_prefixes(prefix_mappings) do
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default_prefixes() |> PrefixMap.merge!(prefix_mappings)
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end
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defdelegate read_string(content, opts), to: RDF.Serialization
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defdelegate read_string!(content, opts), to: RDF.Serialization
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defdelegate read_file(filename, opts \\ []), to: RDF.Serialization
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defdelegate read_file!(filename, opts \\ []), to: RDF.Serialization
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defdelegate write_string(content, opts), to: RDF.Serialization
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defdelegate write_string!(content, opts), to: RDF.Serialization
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defdelegate write_file(content, filename, opts \\ []), to: RDF.Serialization
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defdelegate write_file!(content, filename, opts \\ []), to: RDF.Serialization
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@doc """
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Checks if the given value is a RDF resource.
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## Examples
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Supposed `EX` is a `RDF.Vocabulary.Namespace` and `Foo` is not.
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iex> RDF.resource?(RDF.iri("http://example.com/resource"))
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true
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iex> RDF.resource?(EX.resource)
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true
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iex> RDF.resource?(EX.Resource)
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true
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iex> RDF.resource?(Foo.Resource)
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false
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iex> RDF.resource?(RDF.bnode)
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true
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iex> RDF.resource?(RDF.integer(42))
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false
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iex> RDF.resource?(42)
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false
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"""
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def resource?(value)
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def resource?(%IRI{}), do: true
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def resource?(%BlankNode{}), do: true
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def resource?(atom) when is_atom(atom) and atom not in ~w[true false nil]a do
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resource?(Namespace.resolve_term(atom))
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rescue
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RDF.Namespace.UndefinedTermError -> false
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end
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def resource?(_), do: false
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@doc """
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Checks if the given value is a RDF term.
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## Examples
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Supposed `EX` is a `RDF.Vocabulary.Namespace` and `Foo` is not.
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iex> RDF.term?(RDF.iri("http://example.com/resource"))
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true
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iex> RDF.term?(EX.resource)
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true
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iex> RDF.term?(EX.Resource)
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true
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iex> RDF.term?(Foo.Resource)
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false
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iex> RDF.term?(RDF.bnode)
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true
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iex> RDF.term?(RDF.integer(42))
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true
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iex> RDF.term?(42)
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false
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"""
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def term?(value)
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def term?(%Literal{}), do: true
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def term?(value), do: resource?(value)
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defdelegate uri?(value), to: IRI, as: :valid?
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defdelegate iri?(value), to: IRI, as: :valid?
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defdelegate uri(value), to: IRI, as: :new
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defdelegate iri(value), to: IRI, as: :new
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defdelegate uri!(value), to: IRI, as: :new!
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defdelegate iri!(value), to: IRI, as: :new!
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@doc """
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Checks if the given value is a blank node.
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## Examples
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iex> RDF.bnode?(RDF.bnode)
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true
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iex> RDF.bnode?(RDF.iri("http://example.com/resource"))
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false
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iex> RDF.bnode?(42)
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false
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"""
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def bnode?(%BlankNode{}), do: true
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def bnode?(_), do: false
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defdelegate bnode(), to: BlankNode, as: :new
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defdelegate bnode(id), to: BlankNode, as: :new
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defdelegate literal(value), to: Literal, as: :new
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defdelegate literal(value, opts), to: Literal, as: :new
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defdelegate triple(s, p, o), to: Triple, as: :new
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defdelegate triple(tuple), to: Triple, as: :new
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defdelegate quad(s, p, o, g), to: Quad, as: :new
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defdelegate quad(tuple), to: Quad, as: :new
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defdelegate description(arg), to: Description, as: :new
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defdelegate description(arg1, arg2), to: Description, as: :new
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defdelegate description(arg1, arg2, arg3), to: Description, as: :new
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defdelegate graph(), to: Graph, as: :new
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defdelegate graph(arg), to: Graph, as: :new
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defdelegate graph(arg1, arg2), to: Graph, as: :new
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defdelegate graph(arg1, arg2, arg3), to: Graph, as: :new
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defdelegate graph(arg1, arg2, arg3, arg4), to: Graph, as: :new
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defdelegate dataset(), to: Dataset, as: :new
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defdelegate dataset(arg), to: Dataset, as: :new
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defdelegate dataset(arg1, arg2), to: Dataset, as: :new
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defdelegate diff(arg1, arg2), to: RDF.Diff
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defdelegate list?(resource, graph), to: RDF.List, as: :node?
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defdelegate list?(description), to: RDF.List, as: :node?
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def list(native_list), do: RDF.List.from(native_list)
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def list(head, %Graph{} = graph), do: RDF.List.new(head, graph)
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def list(native_list, opts), do: RDF.List.from(native_list, opts)
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defdelegate string(value), to: RDF.String, as: :new
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defdelegate string(value, opts), to: RDF.String, as: :new
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defdelegate lang_string(value), to: RDF.LangString, as: :new
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defdelegate lang_string(value, opts), to: RDF.LangString, as: :new
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defdelegate langString(value), to: RDF.LangString, as: :new
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defdelegate langString(value, opts), to: RDF.LangString, as: :new
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defdelegate boolean(value), to: RDF.Boolean, as: :new
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defdelegate boolean(value, opts), to: RDF.Boolean, as: :new
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defdelegate integer(value), to: RDF.Integer, as: :new
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defdelegate integer(value, opts), to: RDF.Integer, as: :new
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defdelegate double(value), to: RDF.Double, as: :new
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defdelegate double(value, opts), to: RDF.Double, as: :new
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defdelegate decimal(value), to: RDF.Decimal, as: :new
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defdelegate decimal(value, opts), to: RDF.Decimal, as: :new
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defdelegate date(value), to: RDF.Date, as: :new
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defdelegate date(value, opts), to: RDF.Date, as: :new
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defdelegate time(value), to: RDF.Time, as: :new
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defdelegate time(value, opts), to: RDF.Time, as: :new
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defdelegate date_time(value), to: RDF.DateTime, as: :new
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defdelegate date_time(value, opts), to: RDF.DateTime, as: :new
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defdelegate dateTime(value), to: RDF.DateTime, as: :new
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defdelegate dateTime(value, opts), to: RDF.DateTime, as: :new
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defdelegate datetime(value), to: RDF.DateTime, as: :new
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defdelegate datetime(value, opts), to: RDF.DateTime, as: :new
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defdelegate prefix_map(prefixes), to: RDF.PrefixMap, as: :new
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for term <- ~w[type subject predicate object first rest value]a do
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defdelegate unquote(term)(), to: RDF.NS.RDF
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defdelegate unquote(term)(s, o), to: RDF.NS.RDF
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defdelegate unquote(term)(s, o1, o2), to: RDF.NS.RDF
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defdelegate unquote(term)(s, o1, o2, o3), to: RDF.NS.RDF
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defdelegate unquote(term)(s, o1, o2, o3, o4), to: RDF.NS.RDF
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defdelegate unquote(term)(s, o1, o2, o3, o4, o5), to: RDF.NS.RDF
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end
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defdelegate unquote(:true)(), to: RDF.Boolean.Value
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defdelegate unquote(:false)(), to: RDF.Boolean.Value
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defdelegate langString(), to: RDF.NS.RDF
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defdelegate unquote(nil)(), to: RDF.NS.RDF
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defdelegate __base_iri__(), to: RDF.NS.RDF
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end
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