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comparison rust/hg-core/src/lib.rs @ 44005:6b332c1fc7fe

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rust-core: extracted a revlog submodule This moves fundamental definitions from the top of the crate to the newly created `revlog` submodule and reexports them for easy compatibility. As we are about to add new features to this crate, we felt it will improve clarity, and moreso if `ancestors` and `dagops` would become submodules of `revlog`. Differential Revision: https://phab.mercurial-scm.org/D7782
author Georges Racinet <georges.racinet@octobus.net>
date Wed, 25 Dec 2019 15:17:55 +0100
parents cb2e2b095dc9
children 934a79697c36 df5dfee8cfb4
comparison
equal deleted inserted replaced
44004:9c1fd975e9ac 44005:6b332c1fc7fe
17 CopyMap, CopyMapIter, DirstateEntry, DirstateParents, EntryState, 17 CopyMap, CopyMapIter, DirstateEntry, DirstateParents, EntryState,
18 StateMap, StateMapIter, 18 StateMap, StateMapIter,
19 }; 19 };
20 mod filepatterns; 20 mod filepatterns;
21 pub mod matchers; 21 pub mod matchers;
22 pub mod revlog;
23 pub use revlog::*;
22 pub mod utils; 24 pub mod utils;
23 25
24 use crate::utils::hg_path::HgPathBuf; 26 use crate::utils::hg_path::HgPathBuf;
25 pub use filepatterns::{ 27 pub use filepatterns::{
26 build_single_regex, read_pattern_file, PatternSyntax, PatternTuple, 28 build_single_regex, read_pattern_file, PatternSyntax, PatternTuple,
27 }; 29 };
28 use std::collections::HashMap; 30 use std::collections::HashMap;
29 use twox_hash::RandomXxHashBuilder64; 31 use twox_hash::RandomXxHashBuilder64;
30 32
31 /// Mercurial revision numbers
32 ///
33 /// As noted in revlog.c, revision numbers are actually encoded in
34 /// 4 bytes, and are liberally converted to ints, whence the i32
35 pub type Revision = i32;
36
37 /// Marker expressing the absence of a parent
38 ///
39 /// Independently of the actual representation, `NULL_REVISION` is guaranteed
40 /// to be smaller that all existing revisions.
41 pub const NULL_REVISION: Revision = -1;
42
43 /// Same as `mercurial.node.wdirrev`
44 ///
45 /// This is also equal to `i32::max_value()`, but it's better to spell
46 /// it out explicitely, same as in `mercurial.node`
47 pub const WORKING_DIRECTORY_REVISION: Revision = 0x7fffffff;
48
49 /// The simplest expression of what we need of Mercurial DAGs.
50 pub trait Graph {
51 /// Return the two parents of the given `Revision`.
52 ///
53 /// Each of the parents can be independently `NULL_REVISION`
54 fn parents(&self, rev: Revision) -> Result<[Revision; 2], GraphError>;
55 }
56
57 pub type LineNumber = usize; 33 pub type LineNumber = usize;
58 34
59 /// Rust's default hasher is too slow because it tries to prevent collision 35 /// Rust's default hasher is too slow because it tries to prevent collision
60 /// attacks. We are not concerned about those: if an ill-minded person has 36 /// attacks. We are not concerned about those: if an ill-minded person has
61 /// write access to your repository, you have other issues. 37 /// write access to your repository, you have other issues.
62 pub type FastHashMap<K, V> = HashMap<K, V, RandomXxHashBuilder64>; 38 pub type FastHashMap<K, V> = HashMap<K, V, RandomXxHashBuilder64>;
63
64 #[derive(Clone, Debug, PartialEq)]
65 pub enum GraphError {
66 ParentOutOfRange(Revision),
67 WorkingDirectoryUnsupported,
68 }
69 39
70 #[derive(Clone, Debug, PartialEq)] 40 #[derive(Clone, Debug, PartialEq)]
71 pub enum DirstateParseError { 41 pub enum DirstateParseError {
72 TooLittleData, 42 TooLittleData,
73 Overflow, 43 Overflow,