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rust-cpython: bindings for MissingAncestors
The exposition is rather straightforward, except for the
remove_ancestors_from() method, which forces us to an inefficient
conversion between Python sets and Rust HashSets.
Two alternatives are proposed in comments:
- changing the inner API to "emit" the revision numbers to discard
this would be a substantial change, and it would be better only in the
cases where there are more to retain than to discard
- mutating the Python set directly: this would force us to define an abstract
`RevisionSet` trait, and implement it both for plain `HashSet` and for
a struct enclosing a Python set with the GIL marker `Python<'p>`, also a non
trivial effort.
The main (and seemingly only) caller of this method being
`mercurial.setdiscovery`, which is currently undergoing serious refactoring,
it's not clear whether these improvements would be worth the effort right now,
so we're leaving it as-is.
Also, in `get_bases()` (will also be used by `setdiscovery`), we'd prefer
to build a Python set directly, but we resort to returning a tuple, waiting
to hear back from our PR onto rust-cpython about that
Differential Revision: https://phab.mercurial-scm.org/D5550
author | Georges Racinet <georges.racinet@octobus.net> |
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date | Fri, 30 Nov 2018 20:05:34 +0100 |
parents | bdd2e18b54c5 |
children |
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{ // Enforcing "eqeqeq" : true, // true: Require triple equals (===) for comparison "forin" : true, // true: Require filtering for..in loops with obj.hasOwnProperty() "freeze" : true, // true: prohibits overwriting prototypes of native objects such as Array, Date etc. "nonbsp" : true, // true: Prohibit "non-breaking whitespace" characters. "undef" : true, // true: Require all non-global variables to be declared (prevents global leaks) // Environments "browser" : true // Web Browser (window, document, etc) }