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1 | // Copyright 2018 Georges Racinet <gracinet@anybox.fr> |
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1 | // Copyright 2018 Georges Racinet <gracinet@anybox.fr> | |
2 | // |
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2 | // | |
3 | // This software may be used and distributed according to the terms of the |
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3 | // This software may be used and distributed according to the terms of the | |
4 | // GNU General Public License version 2 or any later version. |
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4 | // GNU General Public License version 2 or any later version. | |
5 | mod ancestors; |
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5 | mod ancestors; | |
6 | pub mod dagops; |
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6 | pub mod dagops; | |
7 | pub use ancestors::{AncestorsIterator, LazyAncestors, MissingAncestors}; |
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7 | pub use ancestors::{AncestorsIterator, LazyAncestors, MissingAncestors}; | |
8 | #[cfg(test)] |
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8 | #[cfg(test)] | |
9 | pub mod testing; |
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9 | pub mod testing; | |
10 |
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10 | |||
11 | /// Mercurial revision numbers |
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11 | /// Mercurial revision numbers | |
12 | /// |
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12 | /// | |
13 | /// As noted in revlog.c, revision numbers are actually encoded in |
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13 | /// As noted in revlog.c, revision numbers are actually encoded in | |
14 | /// 4 bytes, and are liberally converted to ints, whence the i32 |
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14 | /// 4 bytes, and are liberally converted to ints, whence the i32 | |
15 | pub type Revision = i32; |
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15 | pub type Revision = i32; | |
16 |
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16 | |||
17 | pub const NULL_REVISION: Revision = -1; |
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17 | pub const NULL_REVISION: Revision = -1; | |
18 |
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18 | |||
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19 | /// Same as `mercurial.node.wdirrev` | |||
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20 | /// | |||
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21 | /// This is also equal to `i32::max_value()`, but it's better to spell | |||
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22 | /// it out explicitely, same as in `mercurial.node` | |||
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23 | pub const WORKING_DIRECTORY_REVISION: Revision = 0x7fffffff; | |||
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24 | ||||
19 | /// The simplest expression of what we need of Mercurial DAGs. |
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25 | /// The simplest expression of what we need of Mercurial DAGs. | |
20 | pub trait Graph { |
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26 | pub trait Graph { | |
21 | /// Return the two parents of the given `Revision`. |
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27 | /// Return the two parents of the given `Revision`. | |
22 | /// |
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28 | /// | |
23 | /// Each of the parents can be independently `NULL_REVISION` |
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29 | /// Each of the parents can be independently `NULL_REVISION` | |
24 | fn parents(&self, Revision) -> Result<[Revision; 2], GraphError>; |
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30 | fn parents(&self, Revision) -> Result<[Revision; 2], GraphError>; | |
25 | } |
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31 | } | |
26 |
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32 | |||
27 | #[derive(Clone, Debug, PartialEq)] |
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33 | #[derive(Clone, Debug, PartialEq)] | |
28 | pub enum GraphError { |
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34 | pub enum GraphError { | |
29 | ParentOutOfRange(Revision), |
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35 | ParentOutOfRange(Revision), | |
30 | } |
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36 | } |
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