Please note, that changing a default `inspect/2` would break all the existing ExUnit.CaptureIO and ExUnit.CaptureLog tests so I’d better start with opt-in through `custom_options: [expressions: true]` or like.
On Mon, Feb 7, 2022 at 5:45 PM José Valim <jose.va...@dashbit.co> wrote: > Thank you Michał. I have added an issue to convert some of them to > expressions: > > > <https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_elixir-2Dlang_elixir_issues_11610&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=rmhwzhuTk1LyLPLZIrqkat6wS6r2qE3XZKnTTHGaxH8&m=M96lir3O8pqddp1ogS__4K6CwmmCCBchU0WZYRrAICc&s=T29Q49q-RCIpS-1UKIQBPUbia5maDtMbg2G5k5x3-jQ&e=> > https://github.com/elixir-lang/elixir/issues/11610 > <https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_elixir-2Dlang_elixir_issues_11610&d=DwQFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=rmhwzhuTk1LyLPLZIrqkat6wS6r2qE3XZKnTTHGaxH8&m=M96lir3O8pqddp1ogS__4K6CwmmCCBchU0WZYRrAICc&s=T29Q49q-RCIpS-1UKIQBPUbia5maDtMbg2G5k5x3-jQ&e=> > > I think we should at least give it a try as it is quite "low cost" to try > it out. > > We should also discuss if we should add is_map_set_member/2 to our set of > guards, as it will at least make map sets a bit more part of the language. > > On Mon, Feb 7, 2022 at 4:18 PM Michał Muskała <mic...@muskala.eu> wrote: > >> I believe that printing expressions is what python usually does in their >> inspect implementation. It does help a lot with copy & paste when working >> with the shell. >> >> >> >> *From: *elixir-lang-core@googlegroups.com < >> elixir-lang-core@googlegroups.com> on behalf of José Valim < >> jose.va...@dashbit.co> >> *Date: *Monday, 7 February 2022 at 13:57 >> *To: *elixir-lang-core <elixir-lang-core@googlegroups.com> >> *Subject: *Re: [elixir-core:10767] [Proposal] Update MapSets with >> pattern matching, assignments, update shorthand, etc. >> >> And for all of those cases, if we the concern is inspections, there is >> always the option of printing an expression, such as: >> >> >> >> MapSet.new([1, 2, 3]) >> >> URI.parse(" >> <https://urldefense.proofpoint.com/v2/url?u=https-3A__foo_bar&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=rmhwzhuTk1LyLPLZIrqkat6wS6r2qE3XZKnTTHGaxH8&m=M96lir3O8pqddp1ogS__4K6CwmmCCBchU0WZYRrAICc&s=zKRnfX-Ie4-cm-qNJgzMtFatfFpCnxgCG2rxcCn5Dek&e=> >> https://foo/bar >> <https://urldefense.proofpoint.com/v2/url?u=https-3A__foo_bar&d=DwQFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=rmhwzhuTk1LyLPLZIrqkat6wS6r2qE3XZKnTTHGaxH8&m=M96lir3O8pqddp1ogS__4K6CwmmCCBchU0WZYRrAICc&s=zKRnfX-Ie4-cm-qNJgzMtFatfFpCnxgCG2rxcCn5Dek&e=> >> ") >> >> Version.parse!("1.0.0") >> >> >> >> It doesn't address the concerns about pattern matching though. >> >> >> >> On Mon, Feb 7, 2022 at 2:31 PM Wojtek Mach <woj...@wojtekmach.pl> wrote: >> >> Regarding `%MapSet[1, 2]`, I think it looks really nice. >> >> Regarding multi-letter sigils, I think we should have those but not for >> this particular use case. Sigils are for textual representations so not a >> good fit for "containers" like MapSet, Vector, etc, when evaluating >> `%MapSet[...]` we want to evaluate the items inside as _code_ not as _text_ >> (which the sigil would). There's also the sigil escaping that José >> mentioned. >> >> This begs the question do we have `%MapSet[1, 2]` AND `~Version[1.0.0]` >> and I'd say YES but I totally can see why they maybe look a bit too similar >> with pretty different semantics and thus it's one or the other (or none!) >> >> Regarding the gist, >> >> iex> enum = [:foo, :bar, "set"] >> >> ...> %[enum] >> >> %[:foo, :bar, "set"] >> >> >> I think this should be `%[[:foo, :bar, "set"]]`. :) Otherwise `%[x]` is >> different than `%[x, y]` which feels unpredictable. >> >> def function_2(%[:foo]) >> >> >> what are semantics of this pattern match? Does it match when the given >> set is: >> >> 1. a subset of `%[:foo]` >> 2. when it is exactly the same? >> >> # Match and update - like `%{map | key: new_val}` >> >> iex> set = %[%User{id: 1}] >> >> iex> %[set | %User{} => %User{id: 2}] >> >> >> note, on maps we cannot do `%{map | %User{} => %User{id: 2}}` today. I >> mean, we can, but it doesn't do what you want it to do, it would try to >> update a key that `%User{}` evaluates to, something like `%User{id: nil, >> ...}`. Changing the semantics would be a breaking change. It's unclear how >> it should work when it matches multiple elements, do we update all of them? >> That's not obvious! >> >> On February 7, 2022, " >> <https://urldefense.proofpoint.com/v2/url?u=http-3A__a-2Dcorp.co.uk&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=rmhwzhuTk1LyLPLZIrqkat6wS6r2qE3XZKnTTHGaxH8&m=M96lir3O8pqddp1ogS__4K6CwmmCCBchU0WZYRrAICc&s=36Jp-mSNgEysaFU8tS12KigtgiHVVMV_IkS8IQOwehk&e=> >> a-corp.co.uk >> <https://urldefense.proofpoint.com/v2/url?u=http-3A__a-2Dcorp.co.uk&d=DwQFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=rmhwzhuTk1LyLPLZIrqkat6wS6r2qE3XZKnTTHGaxH8&m=M96lir3O8pqddp1ogS__4K6CwmmCCBchU0WZYRrAICc&s=36Jp-mSNgEysaFU8tS12KigtgiHVVMV_IkS8IQOwehk&e=>" >> <a...@a-corp.co.uk> wrote: >> >> This is tricky for me. While I am sympathetic to the feature, I think >> this would be the first time abstraction was added to pattern matching so >> we'd need to be careful. >> >> >> >> Up to now the pattern matching syntax uses the same syntax that you use >> to create the literal data that is being matched. Eg for a map pattern we >> write a map >> >> >> >> %{a: variable} = %{a: 1} >> >> >> >> This brings clarity because the pattern describes the data you are >> matching on - when you read the pattern you can see right away what the >> expected data is (a map). >> >> >> >> The proposal sketched in the Gist would add indirection to pattern >> matching by introducing a new syntax - syntax that is specific to one >> abstract data structure (the map set). >> >> >> >> By abstracting away the details of the data structure being matched on we >> reduce the clarity we usually get, we introduce more syntax into the >> language, and we open the floodgates >> >> to whether we should have pattern matching on more abstract data types - >> Ranges, URIs... DateTimes etc. At which point the question really becomes >> "should we have abstract patterns >> >> in Elixir" which I think is harder to answer. >> >> >> >> In the meantime looking at ex_pat might be valuable to you because it >> would allow you to reach into the details of a MapSet with pattern matching >> in a controlled way that meant if the implementation >> >> details of a MapSet changes it wouldn't break you program too much. >> >> >> >> >> <https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_vic_expat&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=rmhwzhuTk1LyLPLZIrqkat6wS6r2qE3XZKnTTHGaxH8&m=M96lir3O8pqddp1ogS__4K6CwmmCCBchU0WZYRrAICc&s=vsAuMX-vPLPnJBPY3rezm1wu-FuIFaoCjePfs81glKc&e=> >> https://github.com/vic/expat >> <https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_vic_expat&d=DwQFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=rmhwzhuTk1LyLPLZIrqkat6wS6r2qE3XZKnTTHGaxH8&m=M96lir3O8pqddp1ogS__4K6CwmmCCBchU0WZYRrAICc&s=vsAuMX-vPLPnJBPY3rezm1wu-FuIFaoCjePfs81glKc&e=> >> >> >> >> >> Just my two cents though! >> >> >> >> Best >> >> >> >> Adam >> >> >> >> On 7 Feb 2022, at 10:33, SJ <hellobenjamindank...@gmail.com> wrote: >> >> >> >> Hi all. >> >> >> >> I have set out a proposal of what these things could potentially look >> like. >> >> >> >> >> <https://urldefense.proofpoint.com/v2/url?u=https-3A__gist.github.com_bdanklin_f4fc015fa90e9b33bb8cb580344e1258&d=DwMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=rmhwzhuTk1LyLPLZIrqkat6wS6r2qE3XZKnTTHGaxH8&m=M96lir3O8pqddp1ogS__4K6CwmmCCBchU0WZYRrAICc&s=q9ebHMJSEfRriJ2SD9FrzzlWTzAlkBzdC7bCKBu7NgU&e=> >> https://gist.github.com/bdanklin/f4fc015fa90e9b33bb8cb580344e1258 >> <https://urldefense.proofpoint.com/v2/url?u=https-3A__gist.github.com_bdanklin_f4fc015fa90e9b33bb8cb580344e1258&d=DwQFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=rmhwzhuTk1LyLPLZIrqkat6wS6r2qE3XZKnTTHGaxH8&m=M96lir3O8pqddp1ogS__4K6CwmmCCBchU0WZYRrAICc&s=q9ebHMJSEfRriJ2SD9FrzzlWTzAlkBzdC7bCKBu7NgU&e=> >> >> >> >> I searched for prior work in this area and couldn't find any. >> >> >> >> If it's a welcome feature I'd be happy to work on it given some direction >> of where to start. >> >> >> >> Thanks for any feedback. >> >> >> >> Best >> >> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "elixir-lang-core" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to elixir-lang-core+unsubscr...@googlegroups.com. >> To view this discussion on the web visit >> 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