Mercurial > hg
view rust/hg-cpython/src/dirstate/dirs_multiset.rs @ 42849:8db8fa1de2ef
rust-cpython: introduce restricted variant of RefCell
This should catch invalid borrow_mut() calls. Still the ref-sharing
interface is unsafe.
author | Yuya Nishihara <yuya@tcha.org> |
---|---|
date | Sun, 01 Sep 2019 17:37:30 +0900 |
parents | 2e1f74cc3350 |
children | 8f549c46bc64 |
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// dirs_multiset.rs // // Copyright 2019 Raphaël Gomès <rgomes@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::dirstate::dirs_multiset` file provided by the //! `hg-core` package. use std::cell::RefCell; use std::convert::TryInto; use cpython::{ exc, ObjectProtocol, PyBytes, PyClone, PyDict, PyErr, PyObject, PyResult, Python, }; use crate::dirstate::extract_dirstate; use crate::ref_sharing::{PySharedRefCell, PySharedState}; use hg::{DirsMultiset, DirstateMapError, DirstateParseError, EntryState}; py_class!(pub class Dirs |py| { data inner: PySharedRefCell<DirsMultiset>; data py_shared_state: PySharedState; // `map` is either a `dict` or a flat iterator (usually a `set`, sometimes // a `list`) def __new__( _cls, map: PyObject, skip: Option<PyObject> = None ) -> PyResult<Self> { let mut skip_state: Option<EntryState> = None; if let Some(skip) = skip { skip_state = Some( skip.extract::<PyBytes>(py)?.data(py)[0] .try_into() .map_err(|e: DirstateParseError| { PyErr::new::<exc::ValueError, _>(py, e.to_string()) })?, ); } let inner = if let Ok(map) = map.cast_as::<PyDict>(py) { let dirstate = extract_dirstate(py, &map)?; DirsMultiset::from_dirstate(&dirstate, skip_state) } else { let map: Result<Vec<Vec<u8>>, PyErr> = map .iter(py)? .map(|o| Ok(o?.extract::<PyBytes>(py)?.data(py).to_owned())) .collect(); DirsMultiset::from_manifest(&map?) }; Self::create_instance( py, PySharedRefCell::new(inner), PySharedState::default() ) } def addpath(&self, path: PyObject) -> PyResult<PyObject> { self.borrow_mut(py)?.add_path( path.extract::<PyBytes>(py)?.data(py), ); Ok(py.None()) } def delpath(&self, path: PyObject) -> PyResult<PyObject> { self.borrow_mut(py)?.delete_path( path.extract::<PyBytes>(py)?.data(py), ) .and(Ok(py.None())) .or_else(|e| { match e { DirstateMapError::PathNotFound(_p) => { Err(PyErr::new::<exc::ValueError, _>( py, "expected a value, found none".to_string(), )) } DirstateMapError::EmptyPath => { Ok(py.None()) } } }) } def __iter__(&self) -> PyResult<DirsMultisetKeysIterator> { DirsMultisetKeysIterator::create_instance( py, RefCell::new(Some(DirsMultisetLeakedRef::new(py, &self))), RefCell::new(Box::new(self.leak_immutable(py)?.iter())), ) } def __contains__(&self, item: PyObject) -> PyResult<bool> { Ok(self .inner(py) .borrow() .contains(item.extract::<PyBytes>(py)?.data(py).as_ref())) } }); py_shared_ref!(Dirs, DirsMultiset, inner, DirsMultisetLeakedRef,); impl Dirs { pub fn from_inner(py: Python, d: DirsMultiset) -> PyResult<Self> { Self::create_instance( py, PySharedRefCell::new(d), PySharedState::default(), ) } fn translate_key(py: Python, res: &Vec<u8>) -> PyResult<Option<PyBytes>> { Ok(Some(PyBytes::new(py, res))) } } py_shared_sequence_iterator!( DirsMultisetKeysIterator, DirsMultisetLeakedRef, Vec<u8>, Dirs::translate_key, Option<PyBytes> );