Mercurial > public > mercurial-scm > hg
annotate rust/hg-core/src/copy_tracing/tests.rs @ 47123:d8ac62374943
dirstate-tree: Make `DirstateMap` borrow from a bytes buffer
? that has the contents of the `.hg/dirstate` file.
This only applies to the tree-based flavor of `DirstateMap`.
For now only the entire `&[u8]` slice is stored, so this is not useful yet.
Adding a lifetime parameter to the `DirstateMap` struct (in hg-core) makes
Python bindings non-trivial because we keep that struct in a Python object
that has a dynamic lifetime tied to Python?s reference-counting and GC.
As long as we keep the `PyBytes` that owns the borrowed bytes buffer next to
the borrowing struct, the buffer will live long enough for the borrows to stay
valid. However this relationship cannot be expressed in safe Rust code in a
way that would statisfy they borrow-checker. We use `unsafe` code to erase
that lifetime parameter, and encapsulate it in a safe abstraction similar to
the owning-ref crate: https://docs.rs/owning_ref/
Differential Revision: https://phab.mercurial-scm.org/D10557
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Fri, 30 Apr 2021 18:24:54 +0200 |
parents | fa21633af201 |
children | 750409505286 |
rev | line source |
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1 use super::*; |
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2 |
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3 /// Unit tests for: |
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4 /// |
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5 /// ```ignore |
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6 /// fn compare_value( |
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7 /// current_merge: Revision, |
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8 /// merge_case_for_dest: impl Fn() -> MergeCase, |
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9 /// src_minor: &CopySource, |
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10 /// src_major: &CopySource, |
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11 /// ) -> (MergePick, /* overwrite: */ bool) |
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12 /// ``` |
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13 #[test] |
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14 fn test_compare_value() { |
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15 // The `compare_value!` macro calls the `compare_value` function with |
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16 // arguments given in pseudo-syntax: |
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17 // |
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18 // * For `merge_case_for_dest` it takes a plain `MergeCase` value instead |
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19 // of a closure. |
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20 // * `CopySource` values are represented as `(rev, path, overwritten)` |
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21 // tuples of type `(Revision, Option<PathToken>, OrdSet<Revision>)`. |
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22 // * `PathToken` is an integer not read by `compare_value`. It only checks |
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23 // for `Some(_)` indicating a file copy v.s. `None` for a file deletion. |
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24 // * `OrdSet<Revision>` is represented as a Python-like set literal. |
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25 |
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26 use MergeCase::*; |
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27 use MergePick::*; |
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28 |
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29 assert_eq!( |
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30 compare_value!(1, Normal, (1, None, { 1 }), (1, None, { 1 })), |
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31 (Any, false) |
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32 ); |
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33 } |
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34 |
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35 /// Unit tests for: |
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36 /// |
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37 /// ```ignore |
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38 /// fn merge_copies_dict( |
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39 /// path_map: &TwoWayPathMap, // Not visible in test cases |
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40 /// current_merge: Revision, |
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41 /// minor: InternalPathCopies, |
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42 /// major: InternalPathCopies, |
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43 /// get_merge_case: impl Fn(&HgPath) -> MergeCase + Copy, |
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44 /// ) -> InternalPathCopies |
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45 /// ``` |
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46 #[test] |
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47 fn test_merge_copies_dict() { |
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48 // The `merge_copies_dict!` macro calls the `merge_copies_dict` function |
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49 // with arguments given in pseudo-syntax: |
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50 // |
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51 // * `TwoWayPathMap` and path tokenization are implicitly taken care of. |
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52 // All paths are given as string literals. |
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53 // * Key-value maps are represented with `{key1 => value1, key2 => value2}` |
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54 // pseudo-syntax. |
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55 // * `InternalPathCopies` is a map of copy destination path keys to |
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56 // `CopySource` values. |
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57 // - `CopySource` is represented as a `(rev, source_path, overwritten)` |
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58 // tuple of type `(Revision, Option<Path>, OrdSet<Revision>)`. |
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59 // - Unlike in `test_compare_value`, source paths are string literals. |
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60 // - `OrdSet<Revision>` is again represented as a Python-like set |
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61 // literal. |
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62 // * `get_merge_case` is represented as a map of copy destination path to |
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63 // `MergeCase`. The default for paths not in the map is |
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64 // `MergeCase::Normal`. |
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65 // |
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66 // `internal_path_copies!` creates an `InternalPathCopies` value with the |
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67 // same pseudo-syntax as in `merge_copies_dict!`. |
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68 |
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69 use MergeCase::*; |
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70 |
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71 assert_eq!( |
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72 merge_copies_dict!( |
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73 1, |
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74 {"foo" => (1, None, {})}, |
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75 {}, |
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76 {"foo" => Merged} |
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77 ), |
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78 internal_path_copies!("foo" => (1, None, {})) |
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79 ); |
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80 } |
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81 |
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82 /// Unit tests for: |
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83 /// |
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84 /// ```ignore |
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85 /// impl CombineChangesetCopies { |
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86 /// fn new(children_count: HashMap<Revision, usize>) -> Self |
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87 /// |
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88 /// // Called repeatedly: |
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89 /// fn add_revision_inner<'a>( |
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90 /// &mut self, |
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91 /// rev: Revision, |
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92 /// p1: Revision, |
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93 /// p2: Revision, |
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94 /// copy_actions: impl Iterator<Item = Action<'a>>, |
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95 /// get_merge_case: impl Fn(&HgPath) -> MergeCase + Copy, |
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96 /// ) |
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97 /// |
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98 /// fn finish(mut self, target_rev: Revision) -> PathCopies |
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99 /// } |
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100 /// ``` |
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101 #[test] |
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102 fn test_combine_changeset_copies() { |
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103 // `combine_changeset_copies!` creates a `CombineChangesetCopies` with |
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104 // `new`, then calls `add_revision_inner` repeatedly, then calls `finish` |
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105 // for its return value. |
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106 // |
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107 // All paths given as string literals. |
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108 // |
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109 // * Key-value maps are represented with `{key1 => value1, key2 => value2}` |
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110 // pseudo-syntax. |
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111 // * `children_count` is a map of revision numbers to count of children in |
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112 // the DAG. It includes all revisions that should be considered by the |
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113 // algorithm. |
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114 // * Calls to `add_revision_inner` are represented as an array of anonymous |
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115 // structs with named fields, one pseudo-struct per call. |
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116 // |
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117 // `path_copies!` creates a `PathCopies` value, a map of copy destination |
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118 // keys to copy source values. Note: the arrows for map literal syntax |
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119 // point **backwards** compared to the logical direction of copy! |
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120 |
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121 use crate::NULL_REVISION as NULL; |
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122 use Action::*; |
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123 use MergeCase::*; |
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124 |
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125 assert_eq!( |
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126 combine_changeset_copies!( |
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127 { 1 => 1, 2 => 1 }, |
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128 [ |
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129 { rev: 1, p1: NULL, p2: NULL, actions: [], merge_cases: {}, }, |
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130 { rev: 2, p1: NULL, p2: NULL, actions: [], merge_cases: {}, }, |
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131 { |
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132 rev: 3, p1: 1, p2: 2, |
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133 actions: [CopiedFromP1("destination.txt", "source.txt")], |
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134 merge_cases: {"destination.txt" => Merged}, |
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135 }, |
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136 ], |
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137 3, |
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138 ), |
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139 path_copies!("destination.txt" => "source.txt") |
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140 ); |
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141 } |