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rust-dirstate: add rust-cpython bindings to the new parse/pack functions This allows for Python code to call `parse/pack_dirstate` transparently. These bindings are heavy given the relatively simple task, as they are bound to implementation details of both the C and Python code. They will be slimmed down in future patches and eventually completely removed once more of the dirstate code has been refactored/rewritten in Rust. Both functions emulate the mutate-on-loop style of the Python and C implementations by looping over changed items in the compatibility layer, instead of at the core functions. Differential Revision: https://phab.mercurial-scm.org/D6349
author Rapha?l Gom?s <rgomes@octobus.net>
date Mon, 06 May 2019 22:50:34 +0200
parents d1786c1d34fa
children e8f3740cc067
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1 // Copyright 2018 Georges Racinet <gracinet@anybox.fr>
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2 //
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3 // This software may be used and distributed according to the terms of the
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4 // GNU General Public License version 2 or any later version.
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5 extern crate byteorder;
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6 extern crate memchr;
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7
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8 mod ancestors;
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9 pub mod dagops;
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10 pub use ancestors::{AncestorsIterator, LazyAncestors, MissingAncestors};
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11 mod dirstate;
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12 pub mod discovery;
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13 pub mod testing; // unconditionally built, for use from integration tests
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14 pub use dirstate::{
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15 pack_dirstate, parse_dirstate, CopyVec, CopyVecEntry, DirstateEntry,
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16 DirstateParents, DirstateVec,
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17 };
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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 that 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 pub const WORKING_DIRECTORY_REVISION: Revision = 0x7fffffff;
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36
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37 /// The simplest expression of what we need of Mercurial DAGs.
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38 pub trait Graph {
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39 /// Return the two parents of the given `Revision`.
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40 ///
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41 /// Each of the parents can be independently `NULL_REVISION`
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42 fn parents(&self, Revision) -> Result<[Revision; 2], GraphError>;
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43 }
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44
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45 #[derive(Clone, Debug, PartialEq)]
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46 pub enum GraphError {
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47 ParentOutOfRange(Revision),
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48 WorkingDirectoryUnsupported,
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49 }
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51 #[derive(Clone, Debug, PartialEq)]
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52 pub enum DirstateParseError {
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53 TooLittleData,
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54 Overflow,
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55 CorruptedEntry(String),
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56 }
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57
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58 #[derive(Debug, PartialEq)]
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59 pub enum DirstatePackError {
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60 CorruptedEntry(String),
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61 CorruptedParent,
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62 BadSize(usize, usize),
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63 }
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64
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65 impl From<std::io::Error> for DirstatePackError {
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66 fn from(e: std::io::Error) -> Self {
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67 DirstatePackError::CorruptedEntry(e.to_string())
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68 }
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69 }
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70
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71 impl From<std::io::Error> for DirstateParseError {
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72 fn from(e: std::io::Error) -> Self {
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73 DirstateParseError::CorruptedEntry(e.to_string())
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74 }
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75 }