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annotate rust/hg-core/src/revlog.rs @ 46821:e8ae91b1a63d

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rhg: raise wdir specific error for `hg debugdata` Helps remove the conditional in `test-debugcommands.t` for rhg. Differential Revision: https://phab.mercurial-scm.org/D10254
author Pulkit Goyal <7895pulkit@gmail.com>
date Tue, 23 Mar 2021 19:58:49 +0530
parents 645ee7225fab
children 4d2a5ca060e3
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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::{FromHexError, Node, NodePrefix};
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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 pub const WORKING_DIRECTORY_HEX: &str =
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39 "ffffffffffffffffffffffffffffffffffffffff";
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40
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41 /// The simplest expression of what we need of Mercurial DAGs.
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42 pub trait Graph {
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43 /// Return the two parents of the given `Revision`.
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44 ///
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45 /// Each of the parents can be independently `NULL_REVISION`
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46 fn parents(&self, rev: Revision) -> Result<[Revision; 2], GraphError>;
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47 }
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48
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49 #[derive(Clone, Debug, PartialEq)]
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50 pub enum GraphError {
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51 ParentOutOfRange(Revision),
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52 WorkingDirectoryUnsupported,
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53 }
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54
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55 /// The Mercurial Revlog Index
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56 ///
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57 /// This is currently limited to the minimal interface that is needed for
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58 /// the [`nodemap`](nodemap/index.html) module
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59 pub trait RevlogIndex {
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60 /// Total number of Revisions referenced in this index
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61 fn len(&self) -> usize;
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62
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63 fn is_empty(&self) -> bool {
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64 self.len() == 0
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65 }
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66
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67 /// Return a reference to the Node or `None` if rev is out of bounds
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68 ///
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69 /// `NULL_REVISION` is not considered to be out of bounds.
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70 fn node(&self, rev: Revision) -> Option<&Node>;
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71 }