upstream/mercurial-mirror Files · rust/hg-cpython/src/conversion.rs

rust: Make NodePrefix allocation-free and Copy, remove NodePrefixRef...

rust: Make NodePrefix allocation-free and Copy, remove NodePrefixRef The `*Ref` struct only existed to avoid allocating `Vec`s when cloning `NodePrefix`, but we can avoid having `Vec` in the first place by using an inline array instead. This makes `NodePrefix` 21 bytes (with 1 for the length) which is smaller than before as `Vec` alone is 24 bytes. Differential Revision: https://phab.mercurial-scm.org/D9863

Georges Racinet - - Load All Authors

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             conversion.rs
        
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                | application/rls-services+xml
            
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             / rust / hg-cpython / src / conversion.rs
          
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      // conversion.rs

      //

      // Copyright 2019 Georges Racinet <georges.racinet@octobus.net>

      //

      // This software may be used and distributed according to the terms of the

      // GNU General Public License version 2 or any later version.

      //! Bindings for the hg::ancestors module provided by the

      //! `hg-core` crate. From Python, this will be seen as `rustext.ancestor`

      use cpython::{ObjectProtocol, PyObject, PyResult, Python};

      use hg::Revision;

      use std::iter::FromIterator;

      /// Utility function to convert a Python iterable into various collections

      ///

      /// We need this in particular to feed to various methods of inner objects

      /// with `impl IntoIterator<Item=Revision>` arguments, because

      /// a `PyErr` can arise at each step of iteration, whereas these methods

      /// expect iterables over `Revision`, not over some `Result<Revision, PyErr>`

      pub fn rev_pyiter_collect<C>(py: Python, revs: &PyObject) -> PyResult<C>

      where

          C: FromIterator<Revision>,

      {

          revs.iter(py)?

              .map(|r| r.and_then(|o| o.extract::<Revision>(py)))

              .collect()

      }

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				// conversion.rs
				//
				// Copyright 2019 Georges Racinet <georges.racinet@octobus.net>
				//
				// This software may be used and distributed according to the terms of the
				// GNU General Public License version 2 or any later version.

				//! Bindings for the hg::ancestors module provided by the
				//! `hg-core` crate. From Python, this will be seen as `rustext.ancestor`

				use cpython::{ObjectProtocol, PyObject, PyResult, Python};
				use hg::Revision;
				use std::iter::FromIterator;

				/// Utility function to convert a Python iterable into various collections
				///
				/// We need this in particular to feed to various methods of inner objects
				/// with `impl IntoIterator<Item=Revision>` arguments, because
				/// a `PyErr` can arise at each step of iteration, whereas these methods
				/// expect iterables over `Revision`, not over some `Result<Revision, PyErr>`
				pub fn rev_pyiter_collect<C>(py: Python, revs: &PyObject) -> PyResult<C>
				where
				C: FromIterator<Revision>,
				{
				revs.iter(py)?
				.map(\|r\| r.and_then(\|o\| o.extract::<Revision>(py)))
				.collect()
				}