From: samuel@... Date: 2017-04-17T23:21:56+00:00 Subject: [ruby-core:80743] [Ruby trunk Feature#12886] URI#merge doesn't handle paths correctly Issue #12886 has been updated by ioquatix (Samuel Williams). > In other words, in the end, only absolute URIs are actionable. So we need an absolute URI eventually. The way relative resolution is defined, this means that if we have absolute + relative1 + relative2, this is interpreted as (absolute + relative1) + relative2. If we could guarantee that (absolute + relative1) + relative2 == absolute + (relative1 + relative2), then we might implement the "relative + relative" case. But proving this equivalence might turn out to be quite hard. This is exactly what I was thinking - it should be associative - (a + b) + c should be equivalent to a + (b + c). The PR I submitted allows for this, but I haven't done any testing, I don't even know where to begin with adding unit tests to Ruby. All I did was relax it so that it's possible to add together two relative URIs. ---------------------------------------- Feature #12886: URI#merge doesn't handle paths correctly https://bugs.ruby-lang.org/issues/12886#change-64299 * Author: ioquatix (Samuel Williams) * Status: Rejected * Priority: Normal * Assignee: * Target version: ---------------------------------------- I feel like this should work. ~~~ > URI.parse("/base/uri") + URI.parse("relative") URI::BadURIError: both URI are relative ~~~ The result should be URI with path = "/base/relative". But it doesn't. It fails with an exception. There are two ways to fix this. The first is to change the meaning of `URI#absolute?` to relate to the absoluteness of the path, not whether or not there is a scheme. The second way to fix this is to directly work around the issue in `merge`. In my opinion ~~~ > URI.parse("a/b") + URI.parse("c") URI::BadURIError: both URI are relative ~~~ should also work, with a result of "a/c". The need for the LHS of the operation to contain a scheme is not a useful requirement in practice, and in addition, I'd like to state that `URI("a/c")` is actually a valid URI. So, it's purely the `merge` function being to limited in what it will handle for no obvious reason. Situations where this comes up: parsing a website which contains relative URLS, and you want to construct absolute URLs. -- https://bugs.ruby-lang.org/ Unsubscribe: