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//! Relative IRI reference.
#[cfg(feature = "alloc")]
use crate::{
raw,
resolve::resolve,
types::{RiAbsoluteStr, RiReferenceString, RiString},
validate::iri,
};
use crate::{
spec::Spec,
types::{RiFragmentStr, RiReferenceStr},
validate::relative_ref,
};
define_custom_string_slice! {
/// A borrowed slice of a relative IRI reference.
///
/// This corresponds to [`irelative-ref` rule] in [RFC 3987]
/// (and [`relative-ref` rule] in [RFC 3986]).
/// The rule for `irelative-ref` is `irelative-part [ "?" iquery ] [ "#" ifragment ]`.
///
/// # Valid values
///
/// This type can have a relative IRI reference.
///
/// ```
/// # use iri_string::types::IriRelativeStr;
/// assert!(IriRelativeStr::new("foo").is_ok());
/// assert!(IriRelativeStr::new("foo/bar").is_ok());
/// assert!(IriRelativeStr::new("/foo").is_ok());
/// assert!(IriRelativeStr::new("//foo/bar").is_ok());
/// assert!(IriRelativeStr::new("?foo").is_ok());
/// assert!(IriRelativeStr::new("#foo").is_ok());
/// assert!(IriRelativeStr::new("foo/bar?baz#qux").is_ok());
/// // The first path component can have colon if the path is absolute.
/// assert!(IriRelativeStr::new("/foo:bar/").is_ok());
/// // Second or following path components can have colon.
/// assert!(IriRelativeStr::new("foo/bar://baz/").is_ok());
/// assert!(IriRelativeStr::new("./foo://bar").is_ok());
/// ```
///
/// Absolute form of a reference is not allowed.
///
/// ```
/// # use iri_string::types::IriRelativeStr;
/// assert!(IriRelativeStr::new("https://example.com/").is_err());
/// // The first path component cannot have colon, if the path is not absolute.
/// assert!(IriRelativeStr::new("foo:bar").is_err());
/// assert!(IriRelativeStr::new("foo:").is_err());
/// assert!(IriRelativeStr::new("foo:/").is_err());
/// assert!(IriRelativeStr::new("foo://").is_err());
/// assert!(IriRelativeStr::new("foo:///").is_err());
/// assert!(IriRelativeStr::new("foo:////").is_err());
/// assert!(IriRelativeStr::new("foo://///").is_err());
/// ```
///
/// Some characters and sequences cannot used in an IRI reference.
///
/// ```
/// # use iri_string::types::IriRelativeStr;
/// // `<` and `>` cannot directly appear in a relative IRI reference.
/// assert!(IriRelativeStr::new("<not allowed>").is_err());
/// // Broken percent encoding cannot appear in a relative IRI reference.
/// assert!(IriRelativeStr::new("%").is_err());
/// assert!(IriRelativeStr::new("%GG").is_err());
/// ```
///
/// [RFC 3986]: https://tools.ietf.org/html/rfc3986
/// [RFC 3987]: https://tools.ietf.org/html/rfc3987
/// [`irelative-ref` rule]: https://tools.ietf.org/html/rfc3987#section-2.2
/// [`relative-ref` rule]: https://tools.ietf.org/html/rfc3986#section-4.2
struct RiRelativeStr {
validator = relative_ref,
expecting_msg = "Relative IRI reference string",
}
}
#[cfg(feature = "alloc")]
define_custom_string_owned! {
/// An owned string of a relative IRI reference.
///
/// This corresponds to [`irelative-ref` rule] in [RFC 3987]
/// (and [`relative-ref` rule] in [RFC 3986]).
/// The rule for `irelative-ref` is `irelative-part [ "?" iquery ] [ "#" ifragment ]`.
///
/// For details, see the document for [`RiRelativeStr`].
///
/// Enabled by `alloc` or `std` feature.
///
/// [RFC 3986]: https://tools.ietf.org/html/rfc3986
/// [RFC 3987]: https://tools.ietf.org/html/rfc3987
/// [`irelative-ref` rule]: https://tools.ietf.org/html/rfc3987#section-2.2
/// [`relative-ref` rule]: https://tools.ietf.org/html/rfc3986#section-4.2
/// [`RiRelativeString`]: struct.RiRelativeString.html
struct RiRelativeString {
validator = relative_ref,
slice = RiRelativeStr,
expecting_msg = "Relative IRI reference string",
}
}
impl<S: Spec> RiRelativeStr<S> {
/// Returns the fragment part if exists.
///
/// A leading `#` character is truncated if the fragment part exists.
///
/// # Examples
///
/// If the IRI has a fragment part, `Some(_)` is returned.
///
/// ```
/// # use iri_string::{spec::IriSpec, types::{IriFragmentStr, IriRelativeStr}, validate::Error};
/// let iri = IriRelativeStr::new("?foo#bar")?;
/// let fragment = IriFragmentStr::new("bar")?;
/// assert_eq!(iri.fragment(), Some(fragment));
/// # Ok::<_, Error>(())
/// ```
///
/// ```
/// # use iri_string::{spec::IriSpec, types::{IriFragmentStr, IriRelativeStr}, validate::Error};
/// let iri = IriRelativeStr::new("#foo")?;
/// let fragment = IriFragmentStr::new("foo")?;
/// assert_eq!(iri.fragment(), Some(fragment));
/// # Ok::<_, Error>(())
/// ```
///
/// When the fragment part exists but is empty string, `Some(_)` is returned.
///
/// ```
/// # use iri_string::{spec::IriSpec, types::{IriFragmentStr, IriRelativeStr}, validate::Error};
/// let iri = IriRelativeStr::new("#")?;
/// let fragment = IriFragmentStr::new("")?;
/// assert_eq!(iri.fragment(), Some(fragment));
/// # Ok::<_, Error>(())
/// ```
///
/// If the IRI has no fragment, `None` is returned.
///
/// ```
/// # use iri_string::{spec::IriSpec, types::IriRelativeStr, validate::Error};
/// let iri = IriRelativeStr::new("")?;
/// assert_eq!(iri.fragment(), None);
/// # Ok::<_, Error>(())
/// ```
pub fn fragment(&self) -> Option<&RiFragmentStr<S>> {
AsRef::<RiReferenceStr<S>>::as_ref(self).fragment()
}
/// Returns resolved IRI against the given base IRI, using strict resolver.
///
/// About reference resolution output example, see [RFC 3986 section
/// 5.4](https://tools.ietf.org/html/rfc3986#section-5.4).
///
/// About resolver strictness, see [RFC 3986 section
/// 5.4.2](https://tools.ietf.org/html/rfc3986#section-5.4.2):
///
/// > Some parsers allow the scheme name to be present in a relative
/// > reference if it is the same as the base URI scheme. This is considered
/// > to be a loophole in prior specifications of partial URI
/// > [RFC1630](https://tools.ietf.org/html/rfc1630). Its use should be
/// avoided but is allowed for backward compatibility.
/// >
/// > --- <https://tools.ietf.org/html/rfc3986#section-5.4.2>
///
/// Usual users will want to use strict resolver.
///
/// Enabled by `alloc` or `std` feature.
#[cfg(feature = "alloc")]
pub fn resolve_against(&self, base: &RiAbsoluteStr<S>) -> RiString<S> {
resolve(self, base, true)
}
}
#[cfg(feature = "alloc")]
impl<S: Spec> RiRelativeString<S> {
/// Sets the fragment part to the given string.
///
/// Removes fragment part (and following `#` character) if `None` is given.
pub fn set_fragment(&mut self, fragment: Option<&RiFragmentStr<S>>) {
raw::set_fragment(&mut self.inner, fragment.map(AsRef::as_ref));
debug_assert!(iri::<S>(&self.inner).is_ok());
}
}
impl_infallible_conv_between_iri! {
from_slice: RiRelativeStr,
from_owned: RiRelativeString,
to_slice: RiReferenceStr,
to_owned: RiReferenceString,
}