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annotate rust/hg-core/src/revlog.rs @ 46091:9eb07ab3f2d4

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rhg: use persistent nodemap when available ? for node ID ? revision number lookups, instead on linear scan in a revlog. Differential Revision: https://phab.mercurial-scm.org/D9520
author Simon Sapin <simon-commits@exyr.org>
date Fri, 04 Dec 2020 17:27:10 +0100
parents aebc976fd7d5
children 5893706af3de
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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 mod nodemap_docket;
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11 pub mod path_encode;
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12 pub use node::{Node, NodeError, NodePrefix, NodePrefixRef};
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13 pub mod changelog;
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14 pub mod index;
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15 pub mod manifest;
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16 pub mod patch;
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17 pub mod revlog;
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18
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19 /// Mercurial revision numbers
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20 ///
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21 /// As noted in revlog.c, revision numbers are actually encoded in
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22 /// 4 bytes, and are liberally converted to ints, whence the i32
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23 pub type Revision = i32;
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24
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25 /// Marker expressing the absence of a parent
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26 ///
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27 /// Independently of the actual representation, `NULL_REVISION` is guaranteed
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28 /// to be smaller than all existing revisions.
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29 pub const NULL_REVISION: Revision = -1;
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30
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31 /// Same as `mercurial.node.wdirrev`
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32 ///
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33 /// This is also equal to `i32::max_value()`, but it's better to spell
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34 /// it out explicitely, same as in `mercurial.node`
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35 #[allow(clippy::unreadable_literal)]
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36 pub const WORKING_DIRECTORY_REVISION: Revision = 0x7fffffff;
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37
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38 /// The simplest expression of what we need of Mercurial DAGs.
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39 pub trait Graph {
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40 /// Return the two parents of the given `Revision`.
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41 ///
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42 /// Each of the parents can be independently `NULL_REVISION`
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43 fn parents(&self, rev: Revision) -> Result<[Revision; 2], GraphError>;
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44 }
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45
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46 #[derive(Clone, Debug, PartialEq)]
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47 pub enum GraphError {
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48 ParentOutOfRange(Revision),
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49 WorkingDirectoryUnsupported,
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50 }
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51
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52 /// The Mercurial Revlog Index
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53 ///
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54 /// This is currently limited to the minimal interface that is needed for
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55 /// the [`nodemap`](nodemap/index.html) module
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56 pub trait RevlogIndex {
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57 /// Total number of Revisions referenced in this index
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58 fn len(&self) -> usize;
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59
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60 fn is_empty(&self) -> bool {
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61 self.len() == 0
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62 }
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63
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64 /// Return a reference to the Node or `None` if rev is out of bounds
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65 ///
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66 /// `NULL_REVISION` is not considered to be out of bounds.
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67 fn node(&self, rev: Revision) -> Option<&Node>;
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68 }