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annotate rust/hg-core/src/revlog.rs @ 45358:452ece5654c5

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hg-core: remove the `Operation` trait There is no way to currently define a trait which can both return references to `self` and to passed data, which is what we would need. Generic Associated Types may fix this and allow us to have a unified interface. See: rust #44265 Differential Revision: https://phab.mercurial-scm.org/D8862
author Antoine Cezar <antoine.cezar@octobus.net>
date Wed, 29 Jul 2020 10:08:09 +0200
parents 26114bd6ec60
children 26c53ee51c68
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1 // Copyright 2018-2020 Georges Racinet <georges.racinet@octobus.net>
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2 // and Mercurial contributors
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3 //
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4 // This software may be used and distributed according to the terms of the
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5 // GNU General Public License version 2 or any later version.
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6 //! Mercurial concepts for handling revision history
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7
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8 pub mod node;
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9 pub mod nodemap;
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10 pub use node::{Node, NodeError, NodePrefix, NodePrefixRef};
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11
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12 /// Mercurial revision numbers
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13 ///
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14 /// As noted in revlog.c, revision numbers are actually encoded in
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15 /// 4 bytes, and are liberally converted to ints, whence the i32
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16 pub type Revision = i32;
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17
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18 /// Marker expressing the absence of a parent
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19 ///
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20 /// Independently of the actual representation, `NULL_REVISION` is guaranteed
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21 /// to be smaller than all existing revisions.
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22 pub const NULL_REVISION: Revision = -1;
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23
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24 /// Same as `mercurial.node.wdirrev`
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25 ///
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26 /// This is also equal to `i32::max_value()`, but it's better to spell
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27 /// it out explicitely, same as in `mercurial.node`
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28 #[allow(clippy::unreadable_literal)]
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29 pub const WORKING_DIRECTORY_REVISION: Revision = 0x7fffffff;
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30
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31 /// The simplest expression of what we need of Mercurial DAGs.
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32 pub trait Graph {
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33 /// Return the two parents of the given `Revision`.
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34 ///
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35 /// Each of the parents can be independently `NULL_REVISION`
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36 fn parents(&self, rev: Revision) -> Result<[Revision; 2], GraphError>;
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37 }
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38
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39 #[derive(Clone, Debug, PartialEq)]
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40 pub enum GraphError {
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41 ParentOutOfRange(Revision),
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42 WorkingDirectoryUnsupported,
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43 }
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44
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45 /// The Mercurial Revlog Index
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46 ///
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47 /// This is currently limited to the minimal interface that is needed for
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48 /// the [`nodemap`](nodemap/index.html) module
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49 pub trait RevlogIndex {
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50 /// Total number of Revisions referenced in this index
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51 fn len(&self) -> usize;
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52
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53 fn is_empty(&self) -> bool {
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54 self.len() == 0
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55 }
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56
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57 /// Return a reference to the Node or `None` if rev is out of bounds
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58 ///
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59 /// `NULL_REVISION` is not considered to be out of bounds.
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60 fn node(&self, rev: Revision) -> Option<&Node>;
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61 }