Mercurial > hg
view rust/hg-core/src/revlog.rs @ 44268:aa0fc32ece9e
rust-utils: add `Escaped` trait
This will be used as a general interface for displaying things to the user.
The upcoming `IncludeMatcher` will use it to store its patterns in a
user-displayable string.
Differential Revision: https://phab.mercurial-scm.org/D7870
author | Raphaël Gomès <rgomes@octobus.net> |
---|---|
date | Tue, 14 Jan 2020 17:08:45 +0100 |
parents | 9896a8d0d3d2 |
children | 26114bd6ec60 |
line wrap: on
line source
// Copyright 2018-2020 Georges Racinet <georges.racinet@octobus.net> // and Mercurial contributors // // This software may be used and distributed according to the terms of the // GNU General Public License version 2 or any later version. //! Mercurial concepts for handling revision history pub mod node; pub mod nodemap; pub use node::{Node, NodeError, NodePrefix, NodePrefixRef}; /// Mercurial revision numbers /// /// As noted in revlog.c, revision numbers are actually encoded in /// 4 bytes, and are liberally converted to ints, whence the i32 pub type Revision = i32; /// Marker expressing the absence of a parent /// /// Independently of the actual representation, `NULL_REVISION` is guaranteed /// to be smaller than all existing revisions. pub const NULL_REVISION: Revision = -1; /// Same as `mercurial.node.wdirrev` /// /// This is also equal to `i32::max_value()`, but it's better to spell /// it out explicitely, same as in `mercurial.node` pub const WORKING_DIRECTORY_REVISION: Revision = 0x7fffffff; /// The simplest expression of what we need of Mercurial DAGs. pub trait Graph { /// Return the two parents of the given `Revision`. /// /// Each of the parents can be independently `NULL_REVISION` fn parents(&self, rev: Revision) -> Result<[Revision; 2], GraphError>; } #[derive(Clone, Debug, PartialEq)] pub enum GraphError { ParentOutOfRange(Revision), WorkingDirectoryUnsupported, } /// The Mercurial Revlog Index /// /// This is currently limited to the minimal interface that is needed for /// the [`nodemap`](nodemap/index.html) module pub trait RevlogIndex { /// Total number of Revisions referenced in this index fn len(&self) -> usize; /// Return a reference to the Node or `None` if rev is out of bounds /// /// `NULL_REVISION` is not considered to be out of bounds. fn node(&self, rev: Revision) -> Option<&Node>; }