rdf-ex/lib/rdf.ex
2019-04-06 02:24:22 +02:00

276 lines
9.8 KiB
Elixir

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