fluent-uri 0.4.1

A generic URI/IRI handling library compliant with RFC 3986/3987.
Documentation 
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#![cfg(feature = "alloc")]

use fluent_uri::{
    resolve::{ResolveError, Resolver},
    Uri, UriRef,
};

trait Test {
    fn pass(&self, r: &str, res: &str);
    fn fail(&self, r: &str, err: ResolveError);
}

impl Test for Uri<&str> {
    #[track_caller]
    fn pass(&self, r: &str, expected: &str) {
        let r = UriRef::parse(r).unwrap();
        for b in [true, false] {
            let resolver = Resolver::with_base(*self).allow_path_underflow(b);
            assert_eq!(resolver.resolve(&r).unwrap(), expected);
        }
    }

    #[track_caller]
    fn fail(&self, r: &str, expected: ResolveError) {
        let r = UriRef::parse(r).unwrap();
        for b in [true, false] {
            let resolver = Resolver::with_base(*self).allow_path_underflow(b);
            assert_eq!(resolver.resolve(&r).unwrap_err(), expected);
        }
    }
}

#[test]
fn resolve() {
    // Examples from Section 5.4 of RFC 3986.
    let base = Uri::parse("http://a/b/c/d;p?q").unwrap();

    base.pass("g:h", "g:h");
    base.pass("g", "http://a/b/c/g");
    base.pass("./g", "http://a/b/c/g");
    base.pass("g/", "http://a/b/c/g/");
    base.pass("/g", "http://a/g");
    base.pass("//g", "http://g");
    base.pass("?y", "http://a/b/c/d;p?y");
    base.pass("g?y", "http://a/b/c/g?y");
    base.pass("#s", "http://a/b/c/d;p?q#s");
    base.pass("g#s", "http://a/b/c/g#s");
    base.pass("g?y#s", "http://a/b/c/g?y#s");
    base.pass(";x", "http://a/b/c/;x");
    base.pass("g;x", "http://a/b/c/g;x");
    base.pass("g;x?y#s", "http://a/b/c/g;x?y#s");
    base.pass("", "http://a/b/c/d;p?q");
    base.pass(".", "http://a/b/c/");
    base.pass("./", "http://a/b/c/");
    base.pass("..", "http://a/b/");
    base.pass("../", "http://a/b/");
    base.pass("../g", "http://a/b/g");
    base.pass("../..", "http://a/");
    base.pass("../../", "http://a/");
    base.pass("../../g", "http://a/g");

    base.pass("/./g", "http://a/g");
    base.pass("g.", "http://a/b/c/g.");
    base.pass(".g", "http://a/b/c/.g");
    base.pass("g..", "http://a/b/c/g..");
    base.pass("..g", "http://a/b/c/..g");

    base.pass("./../g", "http://a/b/g");
    base.pass("./g/.", "http://a/b/c/g/");
    base.pass("g/./h", "http://a/b/c/g/h");
    base.pass("g/../h", "http://a/b/c/h");
    base.pass("g;x=1/./y", "http://a/b/c/g;x=1/y");
    base.pass("g;x=1/../y", "http://a/b/c/y");

    base.pass("g?y/./x", "http://a/b/c/g?y/./x");
    base.pass("g?y/../x", "http://a/b/c/g?y/../x");
    base.pass("g#s/./x", "http://a/b/c/g#s/./x");
    base.pass("g#s/../x", "http://a/b/c/g#s/../x");

    base.pass("http:g", "http:g");

    // Non-hierarchical base URI.
    let base = Uri::parse("foo:bar").unwrap();

    base.pass("", "foo:bar");
    base.pass("#baz", "foo:bar#baz");
    base.pass("http://example.com/", "http://example.com/");
    base.pass("foo:baz", "foo:baz");
    base.pass("bar:baz", "bar:baz");

    let base = Uri::parse("foo:/").unwrap();
    // The result would be "foo://@@" using the original algorithm.
    base.pass(".//@@", "foo:/.//@@");

    let base = Uri::parse("foo:/bar/baz/.%2E/").unwrap();
    // The result would be "foo:/bar/baz" using the original algorithm.
    base.pass("..", "foo:/");

    let base = Uri::parse("foo:/bar/..").unwrap();
    // The result would be "foo:/bar/" using the original algorithm.
    base.pass(".", "foo:/");

    let base = base.normalize();
    base.borrow().pass(".", "foo:/");
}

#[test]
fn resolve_error() {
    let base = Uri::parse("http://example.com/#title1").unwrap();
    base.fail("foo", ResolveError::BaseWithFragment);

    let base = Uri::parse("foo:bar").unwrap();
    base.fail("baz", ResolveError::InvalidReferenceAgainstOpaqueBase);
    base.fail("?baz", ResolveError::InvalidReferenceAgainstOpaqueBase);
}

#[test]
fn resolve_underflow() {
    for (base, rs) in [
        (
            "http://a/b/c/d;p?q",
            ["../../../g", "../../../../g", "/../g"],
        ),
        ("foo:/..", ["", "?a", "#a"]),
    ] {
        let base = Uri::parse(base).unwrap();

        for r in rs {
            let resolver = Resolver::with_base(base).allow_path_underflow(true);
            assert!(resolver.resolve(&UriRef::parse(r).unwrap()).is_ok());

            let resolver = Resolver::with_base(base).allow_path_underflow(false);
            assert_eq!(
                resolver.resolve(&UriRef::parse(r).unwrap()).unwrap_err(),
                ResolveError::PathUnderflow
            );
        }
    }

    let base = Uri::parse("foo:bar/..").unwrap();
    base.pass("", "foo:bar/..");
    base.fail("?a", ResolveError::InvalidReferenceAgainstOpaqueBase);
    base.pass("#a", "foo:bar/..#a");
}