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meander
All things about https://github.com/noprompt/meander
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nlessa 2020-03-01T01:08:49.091400Z
thanks Timothy! Nice trick!
timothypratley 2020-03-01T02:15:38.092100Z
(m/match
{:a 1
:b 2}
{:a !v
& (m/or {:b !v}
{})}
!v)
jimmy 2020-03-01T14:39:57.094400Z
Yes everything is optional by default. my answer was assuming you just didn't want the nil to be in your memory variable. Technically it isn't just guard or pred. If you put a vector pattern for example that means you are asserting that there is some non nil vector there.
jimmy 2020-03-01T02:19:48.092200Z
Any reason not to do just (m/or nil !v)?
timothypratley 2020-03-01T03:25:23.092400Z
I’m not following :thinking_face:
I’m matching something like {:methods [1 2 3] :resources {:methods [4 5 6]}} where a resource has methods and optionally a sub resource with methods etc and am using this:
(def extract-resource-methods
(s/rewrite
(m/with [%resource {:methods {& (m/seqable [_ !methods] ...)}
& (m/or {:resources {& (m/seqable [_ %resource] ...)}}
{})}]
[?baseUrl %resource])
;;=>
[[?baseUrl !methods] ...])):resources may or may not be present… it just seems a little wierd like I’m over complicating it.jimmy 2020-03-01T05:15:27.092600Z
This is a bug not 100% sure the correct fix for this. But should have a fix tomorrow or monday.
timothypratley 2020-03-01T06:33:20.092800Z
I guess more importantly I don’t see a way to do many optional keys
timothypratley 2020-03-01T07:11:19.094200Z
oh I think I see…
(m/match
{:a 1}
{:a ?a
:b ?b}
[?a ?b])
=> [1 nil]
noprompt 2020-03-01T21:10:12.096400Z
[meander/epsilon "0.0.401"]or pattern compilation
• Fixes uses of transients in substitution codejimmy 2020-03-01T22:35:52.098Z
The or stuff didn't actually land in this release. But we will cut a new one soon with the or fix.