##// END OF EJS Templates
dirstate-tree: Make `DirstateMap` borrow from a bytes buffer...
dirstate-tree: Make `DirstateMap` borrow from a bytes buffer … that has the contents of the `.hg/dirstate` file. This only applies to the tree-based flavor of `DirstateMap`. For now only the entire `&[u8]` slice is stored, so this is not useful yet. Adding a lifetime parameter to the `DirstateMap` struct (in hg-core) makes Python bindings non-trivial because we keep that struct in a Python object that has a dynamic lifetime tied to Python’s reference-counting and GC. As long as we keep the `PyBytes` that owns the borrowed bytes buffer next to the borrowing struct, the buffer will live long enough for the borrows to stay valid. However this relationship cannot be expressed in safe Rust code in a way that would statisfy they borrow-checker. We use `unsafe` code to erase that lifetime parameter, and encapsulate it in a safe abstraction similar to the owning-ref crate: https://docs.rs/owning_ref/ Differential Revision: https://phab.mercurial-scm.org/D10557

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testing.rs
72 lines | 1.7 KiB | application/rls-services+xml | RustLexer
Georges Racinet
rust: factorized testing Graphs...
r41277 // testing.rs
//
// Copyright 2018 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.
use crate::{Graph, GraphError, Revision, NULL_REVISION};
/// A stub `Graph`, same as the one from `test-ancestor.py`
///
/// o 13
/// |
/// | o 12
/// | |
/// | | o 11
/// | | |\
/// | | | | o 10
/// | | | | |
/// | o---+ | 9
/// | | | | |
/// o | | | | 8
/// / / / /
/// | | o | 7
/// | | | |
/// o---+ | 6
/// / / /
/// | | o 5
/// | |/
/// | o 4
/// | |
/// o | 3
/// | |
/// | o 2
/// |/
/// o 1
/// |
/// o 0
#[derive(Clone, Debug)]
pub struct SampleGraph;
impl Graph for SampleGraph {
fn parents(&self, rev: Revision) -> Result<[Revision; 2], GraphError> {
match rev {
0 => Ok([NULL_REVISION, NULL_REVISION]),
1 => Ok([0, NULL_REVISION]),
2 => Ok([1, NULL_REVISION]),
3 => Ok([1, NULL_REVISION]),
4 => Ok([2, NULL_REVISION]),
5 => Ok([4, NULL_REVISION]),
6 => Ok([4, NULL_REVISION]),
7 => Ok([4, NULL_REVISION]),
8 => Ok([NULL_REVISION, NULL_REVISION]),
9 => Ok([6, 7]),
10 => Ok([5, NULL_REVISION]),
11 => Ok([3, 7]),
12 => Ok([9, NULL_REVISION]),
13 => Ok([8, NULL_REVISION]),
r => Err(GraphError::ParentOutOfRange(r)),
}
}
}
// A Graph represented by a vector whose indices are revisions
// and values are parents of the revisions
pub type VecGraph = Vec<[Revision; 2]>;
impl Graph for VecGraph {
fn parents(&self, rev: Revision) -> Result<[Revision; 2], GraphError> {
Ok(self[rev as usize])
}
}