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annotate rust/hg-core/src/testing.rs @ 47682:78f7f0d490ee

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dirstate-v2: Move fixed-size tree metadata into the docket file Before this changeset, the dirstate-v2 data file contained not only nodes and paths that may be reused when appending to an existing file, but also some fixed-size metadata that applies to the entire tree and was added at the end of the data file for every append. This moves that metadata into the docket file, so that repeated "append" operations without meaningful changes don?t actually need to grow any file. Differential Revision: https://phab.mercurial-scm.org/D11098
author Simon Sapin <simon.sapin@octobus.net>
date Thu, 15 Jul 2021 23:02:17 +0200
parents 168041fa6d5f
children 4c5f6e95df84
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1 // testing.rs
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2 //
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3 // Copyright 2018 Georges Racinet <georges.racinet@octobus.net>
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4 //
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5 // This software may be used and distributed according to the terms of the
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6 // GNU General Public License version 2 or any later version.
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7
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8 use crate::{Graph, GraphError, Revision, NULL_REVISION};
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9
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10 /// A stub `Graph`, same as the one from `test-ancestor.py`
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11 ///
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12 /// o 13
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13 /// |
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14 /// | o 12
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15 /// | |
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16 /// | | o 11
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17 /// | | |\
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18 /// | | | | o 10
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19 /// | | | | |
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20 /// | o---+ | 9
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21 /// | | | | |
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22 /// o | | | | 8
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23 /// / / / /
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24 /// | | o | 7
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25 /// | | | |
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26 /// o---+ | 6
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27 /// / / /
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28 /// | | o 5
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29 /// | |/
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30 /// | o 4
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31 /// | |
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32 /// o | 3
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33 /// | |
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34 /// | o 2
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35 /// |/
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36 /// o 1
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37 /// |
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38 /// o 0
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39 #[derive(Clone, Debug)]
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40 pub struct SampleGraph;
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41
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42 impl Graph for SampleGraph {
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43 fn parents(&self, rev: Revision) -> Result<[Revision; 2], GraphError> {
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44 match rev {
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45 0 => Ok([NULL_REVISION, NULL_REVISION]),
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46 1 => Ok([0, NULL_REVISION]),
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47 2 => Ok([1, NULL_REVISION]),
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48 3 => Ok([1, NULL_REVISION]),
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49 4 => Ok([2, NULL_REVISION]),
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50 5 => Ok([4, NULL_REVISION]),
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51 6 => Ok([4, NULL_REVISION]),
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52 7 => Ok([4, NULL_REVISION]),
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53 8 => Ok([NULL_REVISION, NULL_REVISION]),
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54 9 => Ok([6, 7]),
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55 10 => Ok([5, NULL_REVISION]),
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56 11 => Ok([3, 7]),
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57 12 => Ok([9, NULL_REVISION]),
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58 13 => Ok([8, NULL_REVISION]),
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59 r => Err(GraphError::ParentOutOfRange(r)),
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60 }
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61 }
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62 }
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63
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64 // A Graph represented by a vector whose indices are revisions
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65 // and values are parents of the revisions
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66 pub type VecGraph = Vec<[Revision; 2]>;
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67
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68 impl Graph for VecGraph {
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69 fn parents(&self, rev: Revision) -> Result<[Revision; 2], GraphError> {
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70 Ok(self[rev as usize])
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71 }
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72 }