A Rust crate for handling URNs.

Last update: Jun 25, 2022

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Overview

URN

A Rust crate for handling URNs. Parsing and comparison is done according to the spec (meaning only part of the URN is used for equality checks). Some RFCs define per-namespace lexical equivalence rules, those aren't taken into account here. no_std support is available if you disable the default "std" feature. alloc is needed, but the Urn type is a wrapper around String and should only use a single allocation (but I haven't checked). You can even construct a Urn from your own String by using TryFrom, that way it shouldn't allocate at all.

URNs have a surprising amount of obscure details to the point I'm not sure at this point if other URN parsers can be trusted! Granted, there's very little of them because almost nobody really needs URNs...

Changelog

0.1.0 - initial release
0.1.1 - add FromStr impl
0.2.0 - remove Urn::parse function in favor of FromStr, improve docs
0.2.1 - remove files left over from 0.1
0.3.0 - major implementation changes, remove Namespace (thanks to u/chris-morgan for help)
0.3.1 - fix a panic on empty NSS and add ?= terminator to r-component (both ? and = can be part of r-component, but together they terminate it)
0.3.2 - add Clone impl for Urn
0.3.3 - more precise builder errors; reduce memory footprint by up to 15 bytes (but increase it by 5 bytes on 16-bit platforms)

License

TL;DR do whatever you want.

Licensed under either the BSD Zero Clause License (https://opensource.org/licenses/0BSD), the Apache 2.0 License (http://www.apache.org/licenses/LICENSE-2.0) or the MIT License (http://opensource.org/licenses/MIT), at your choice.

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Comments

more accurate builder errors

Currently, the URN gets created as-is, and build() returns whatever error there is if it fails. For example, setting abc:: as the namespace (and hence making the URN start with urn:abc::) will make it fail with InvalidNss despite it actually being an invalid namespace. I'm not interested in this enough to fix it at the moment, but maybe I'll do it some day.
bug

opened by chayleaf 1

URN::parse panics on UTF strings

Description

URN::parse panics when it tries to lowercase a UTF string. I am aware that the RFC specifies only ASCII characters but it should return Err instead.

My current workaround is to check with str::is_ascii before parsing.

assert!("6򭞦*c!󈰠v #®􇣺[®nE⁐c;gPS5<5!¡r󠀁R⁎".parse::<Urn>().is_ok());

thread 'tests::custom_test' panicked at 'byte index 4 is not a char boundary; it is inside '\u{ad7a6}' (bytes 1..5) of `6򭞦*c!󈰠v #®􇣺[®nE⁐c;gPS5<5!¡r󠀁R⁎`', src/lib.rs:76:21
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

opened by FrancisMurillo 0

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