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annotate rust/hg-cpython/src/conversion.rs @ 44204:bafdaf4858d8

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rust-cpython: inline PySharedState::try_borrow_mut() Since the core borrowing/leaking logic has been moved to PySharedRef* and PyLeaked*, it doesn't make sense that PySharedState had a function named "try_borrow_mut". Let's turn it into a pure data struct.
author Yuya Nishihara <yuya@tcha.org>
date Sat, 19 Oct 2019 16:34:02 +0900
parents 33fe96a5c522
children c7fb9b74e753
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1 // conversion.rs
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2 //
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3 // Copyright 2019 Georges Racinet <georges.racinet@octobus.net>
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4 //
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5 // This software may be used and distributed according to the terms of the
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6 // GNU General Public License version 2 or any later version.
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7
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8 //! Bindings for the hg::ancestors module provided by the
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9 //! `hg-core` crate. From Python, this will be seen as `rustext.ancestor`
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11 use cpython::{ObjectProtocol, PyObject, PyResult, Python};
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12 use hg::Revision;
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13 use std::iter::FromIterator;
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14
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15 /// Utility function to convert a Python iterable into various collections
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16 ///
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17 /// We need this in particular to feed to various methods of inner objects
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18 /// with `impl IntoIterator<Item=Revision>` arguments, because
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19 /// a `PyErr` can arise at each step of iteration, whereas these methods
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20 /// expect iterables over `Revision`, not over some `Result<Revision, PyErr>`
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21 pub fn rev_pyiter_collect<C>(py: Python, revs: &PyObject) -> PyResult<C>
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22 where
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23 C: FromIterator<Revision>,
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24 {
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25 revs.iter(py)?
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26 .map(|r| r.and_then(|o| o.extract::<Revision>(py)))
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27 .collect()
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28 }