RDF.ex v0.6.1 RDF.IRI View Source
A structure for IRIs.
This structure just wraps a plain IRI string and doesn't bother with the
components of the IRI, since in the context of RDF there are usually very many
IRIs and parsing them isn't needed in most cases. For these reasons we don't
use Elixirs built-in URI structure, because it would be unnecessary
expensive in terms of performance and memory.
The component parts can always be retrieved with the RDF.IRI.parse/1
function, which returns Elixirs built-in URI structure. Note, that URI
doesn't escape Unicode characters by default, so it's a suitable structure for
IRIs.
Link to this section Summary
Functions
Resolves a relative IRI against a base IRI.
Checks if the given value is an absolute IRI.
The default base IRI to be used when reading a serialization and no base option is provided.
Tests for value equality of IRIs.
Merges two IRIs.
Parses an IRI into its components and returns them as an URI struct.
Returns the scheme of the given IRI
Returns the given IRI as a string.
Returns the given value unchanged if it's a valid IRI, otherwise raises an exception.
Checks if the given IRI is valid.
Link to this section Types
t()
View Source
t() :: module()
t() :: module()
Link to this section Functions
absolute(iri, base) View Source
Resolves a relative IRI against a base IRI.
as specified in section 5.1 Establishing a Base URI of RFC3986. 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
If the given is not an absolute IRI nil is returned.
absolute?(iri) View Source
Checks if the given value is an absolute IRI.
An absolute IRI is defined in RFC3987 containing a scheme along with a path and optional query and fragment segments.
default_base() View Source
The default base IRI to be used when reading a serialization and no base option is provided.
The value can be set via the default_base_iri configuration. For example:
config :rdf,
default_base_iri: "http://my_app.example/"equal_value?(left, right) View Source
Tests for value equality of IRIs.
Returns nil when the given arguments are not comparable as IRIs.
see https://www.w3.org/TR/rdf-concepts/#section-Graph-URIref
merge(base, rel) View Source
Merges two IRIs.
This function merges two IRIs as per RFC 3986, section 5.2.
new(iri) View Source
Creates a RDF.IRI.
new!(iri) View Source
Creates a RDF.IRI, but checks if the given IRI is valid.
If the given IRI is not valid a RDF.IRI.InvalidError is raised.
see valid?/1
parse(iri) View Source
Parses an IRI into its components and returns them as an URI struct.
scheme(iri) View Source
Returns the scheme of the given IRI
If the given string is not a valid absolute IRI, nil is returned.
Examples
iex> RDF.IRI.scheme("http://www.example.com/foo")
"http"
iex> RDF.IRI.scheme("not an iri")
nilto_string(iri) View Source
Returns the given IRI as a string.
Note that this function can also handle RDF.Vocabulary.Namespace terms.
Examples
iex> RDF.IRI.to_string RDF.IRI.new("http://example.com/#foo")
"http://example.com/#foo"
iex> RDF.IRI.to_string EX.foo
"http://example.com/#foo"
iex> RDF.IRI.to_string EX.Foo
"http://example.com/#Foo"valid!(iri) View Source
Returns the given value unchanged if it's a valid IRI, otherwise raises an exception.
Examples
iex> RDF.IRI.valid!("http://www.example.com/foo")
"http://www.example.com/foo"
iex> RDF.IRI.valid!(RDF.IRI.new("http://www.example.com/foo"))
RDF.IRI.new("http://www.example.com/foo")
iex> RDF.IRI.valid!("not an iri")
** (RDF.IRI.InvalidError) Invalid IRI: "not an iri"valid?(iri) View Source
Checks if the given IRI is valid.
Note: This currently checks only if the given IRI is absolute.
Examples
iex> RDF.IRI.valid?("http://www.example.com/foo")
true
iex> RDF.IRI.valid?("not an iri")
false