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annotate rust/hg-core/src/dirstate_tree/owning.rs @ 50252:a6b8b1ab9116

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branching: merge stable into default The clippy god had to be appeased on some aspect.
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Thu, 02 Mar 2023 19:02:52 +0100
parents e98fd81bb151 dbe09fb038fc
children 2cc5de261d76
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 use crate::{DirstateError, DirstateParents};
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2
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3 use super::dirstate_map::DirstateMap;
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4 use std::ops::Deref;
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5
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6 use ouroboros::self_referencing;
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7
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8 /// Keep a `DirstateMap<'on_disk>` next to the `on_disk` buffer that it
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9 /// borrows.
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10 #[self_referencing]
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11 pub struct OwningDirstateMap {
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12 on_disk: Box<dyn Deref<Target = [u8]> + Send>,
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13 #[borrows(on_disk)]
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14 #[covariant]
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15 map: DirstateMap<'this>,
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16 }
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17
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18 impl OwningDirstateMap {
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19 pub fn new_empty<OnDisk>(on_disk: OnDisk) -> Self
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20 where
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21 OnDisk: Deref<Target = [u8]> + Send + 'static,
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22 {
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23 let on_disk = Box::new(on_disk);
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24
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25 OwningDirstateMapBuilder {
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26 on_disk,
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27 map_builder: |bytes| DirstateMap::empty(bytes),
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28 }
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29 .build()
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30 }
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31
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32 pub fn new_v1<OnDisk>(
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33 on_disk: OnDisk,
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34 identity: Option<u64>,
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35 ) -> Result<(Self, DirstateParents), DirstateError>
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36 where
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37 OnDisk: Deref<Target = [u8]> + Send + 'static,
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38 {
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39 let on_disk = Box::new(on_disk);
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40 let mut parents = DirstateParents::NULL;
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41
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42 Ok((
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43 OwningDirstateMapTryBuilder {
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44 on_disk,
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45 map_builder: |bytes| {
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46 DirstateMap::new_v1(bytes, identity).map(|(dmap, p)| {
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47 parents = p.unwrap_or(DirstateParents::NULL);
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48 dmap
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49 })
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50 },
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51 }
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52 .try_build()?,
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53 parents,
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54 ))
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55 }
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56
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57 pub fn new_v2<OnDisk>(
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58 on_disk: OnDisk,
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59 data_size: usize,
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60 metadata: &[u8],
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61 uuid: Vec<u8>,
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62 identity: Option<u64>,
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63 ) -> Result<Self, DirstateError>
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64 where
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65 OnDisk: Deref<Target = [u8]> + Send + 'static,
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66 {
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67 let on_disk = Box::new(on_disk);
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68
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69 OwningDirstateMapTryBuilder {
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70 on_disk,
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71 map_builder: |bytes| {
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72 DirstateMap::new_v2(bytes, data_size, metadata, uuid, identity)
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73 },
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74 }
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75 .try_build()
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76 }
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77
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78 pub fn with_dmap_mut<R>(
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79 &mut self,
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80 f: impl FnOnce(&mut DirstateMap) -> R,
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81 ) -> R {
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82 self.with_map_mut(f)
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83 }
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84
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85 pub fn get_map(&self) -> &DirstateMap {
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86 self.borrow_map()
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87 }
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88
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89 pub fn on_disk(&self) -> &[u8] {
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90 self.borrow_on_disk()
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91 }
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92
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93 pub fn old_uuid(&self) -> Option<&[u8]> {
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94 self.get_map().old_uuid.as_deref()
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95 }
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96
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97 pub fn old_identity(&self) -> Option<u64> {
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98 self.get_map().identity
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99 }
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100
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101 pub fn old_data_size(&self) -> usize {
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102 self.get_map().old_data_size
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103 }
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104 }