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annotate rust/hg-core/src/lib.rs @ 43490:a77d4fe347a4

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rust-matchers: add `Matcher` trait and implement `AlwaysMatcher` In our quest of a faster Mercurial, we have arrived at the point where we need to implement the matchers in Rust. This RFC mainly for the `Matcher` trait to see if the changes proposed feel fine to people with more experience on the matter. While the `AlwaysMatcher` implementation is here as a trivial example, it should be the first step towards matchers use in Rust as it is currently the only supported one. Notable changes: - `exact` is renamed to `exact_match` - enums for `visit*` methods with `Recursive` instead of `'all'`, etc. - a new `roots`, separate from `file_set` - no `bad`, `explicitdir` or `traversedir` functions as they can be passed to the high functions instead of the matchers Thanks to Martin for suggesting the last two (most important) changes and for reaching out to help a few weeks ago. Differential Revision: https://phab.mercurial-scm.org/D7178
author Rapha?l Gom?s <rgomes@octobus.net>
date Tue, 29 Oct 2019 17:16:28 +0100
parents 99394e6c5d12
children 1fe2e574616e
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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 mod ancestors;
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6 pub mod dagops;
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7 pub use ancestors::{AncestorsIterator, LazyAncestors, MissingAncestors};
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8 mod dirstate;
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9 pub mod discovery;
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10 pub mod testing; // unconditionally built, for use from integration tests
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11 pub use dirstate::{
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12 dirs_multiset::{DirsMultiset, DirsMultisetIter},
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13 dirstate_map::DirstateMap,
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14 parsers::{pack_dirstate, parse_dirstate, PARENT_SIZE},
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15 status::status,
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16 CopyMap, CopyMapIter, DirstateEntry, DirstateParents, EntryState,
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17 StateMap, StateMapIter,
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18 };
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19 mod filepatterns;
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20 pub mod matchers;
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21 pub mod utils;
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22
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23 use crate::utils::hg_path::HgPathBuf;
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24 pub use filepatterns::{
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25 build_single_regex, read_pattern_file, PatternSyntax, PatternTuple,
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26 };
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27
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28 /// Mercurial revision numbers
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29 ///
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30 /// As noted in revlog.c, revision numbers are actually encoded in
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31 /// 4 bytes, and are liberally converted to ints, whence the i32
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32 pub type Revision = i32;
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33
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34 /// Marker expressing the absence of a parent
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35 ///
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36 /// Independently of the actual representation, `NULL_REVISION` is guaranteed
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37 /// to be smaller that all existing revisions.
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38 pub const NULL_REVISION: Revision = -1;
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39
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40 /// Same as `mercurial.node.wdirrev`
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41 ///
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42 /// This is also equal to `i32::max_value()`, but it's better to spell
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43 /// it out explicitely, same as in `mercurial.node`
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44 pub const WORKING_DIRECTORY_REVISION: Revision = 0x7fffffff;
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45
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46 /// The simplest expression of what we need of Mercurial DAGs.
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47 pub trait Graph {
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48 /// Return the two parents of the given `Revision`.
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49 ///
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50 /// Each of the parents can be independently `NULL_REVISION`
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51 fn parents(&self, rev: Revision) -> Result<[Revision; 2], GraphError>;
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52 }
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53
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54 pub type LineNumber = usize;
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55
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56 #[derive(Clone, Debug, PartialEq)]
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57 pub enum GraphError {
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58 ParentOutOfRange(Revision),
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59 WorkingDirectoryUnsupported,
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60 }
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61
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62 #[derive(Clone, Debug, PartialEq)]
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63 pub enum DirstateParseError {
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64 TooLittleData,
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65 Overflow,
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66 CorruptedEntry(String),
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67 Damaged,
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68 }
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69
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70 impl From<std::io::Error> for DirstateParseError {
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71 fn from(e: std::io::Error) -> Self {
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72 DirstateParseError::CorruptedEntry(e.to_string())
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73 }
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74 }
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75
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76 impl ToString for DirstateParseError {
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77 fn to_string(&self) -> String {
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78 use crate::DirstateParseError::*;
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79 match self {
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80 TooLittleData => "Too little data for dirstate.".to_string(),
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81 Overflow => "Overflow in dirstate.".to_string(),
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82 CorruptedEntry(e) => format!("Corrupted entry: {:?}.", e),
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83 Damaged => "Dirstate appears to be damaged.".to_string(),
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84 }
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85 }
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86 }
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87
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88 #[derive(Debug, PartialEq)]
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89 pub enum DirstatePackError {
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90 CorruptedEntry(String),
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91 CorruptedParent,
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92 BadSize(usize, usize),
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93 }
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94
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95 impl From<std::io::Error> for DirstatePackError {
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96 fn from(e: std::io::Error) -> Self {
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97 DirstatePackError::CorruptedEntry(e.to_string())
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98 }
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99 }
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100 #[derive(Debug, PartialEq)]
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101 pub enum DirstateMapError {
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102 PathNotFound(HgPathBuf),
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103 EmptyPath,
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104 }
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105
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106 pub enum DirstateError {
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107 Parse(DirstateParseError),
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108 Pack(DirstatePackError),
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109 Map(DirstateMapError),
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110 IO(std::io::Error),
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111 }
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112
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113 impl From<DirstateParseError> for DirstateError {
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114 fn from(e: DirstateParseError) -> Self {
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115 DirstateError::Parse(e)
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116 }
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117 }
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118
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119 impl From<DirstatePackError> for DirstateError {
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120 fn from(e: DirstatePackError) -> Self {
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121 DirstateError::Pack(e)
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122 }
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123 }
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124
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125 #[derive(Debug)]
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126 pub enum PatternError {
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127 UnsupportedSyntax(String),
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128 }
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129
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130 #[derive(Debug)]
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131 pub enum PatternFileError {
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132 IO(std::io::Error),
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133 Pattern(PatternError, LineNumber),
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134 }
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135
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136 impl From<std::io::Error> for PatternFileError {
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137 fn from(e: std::io::Error) -> Self {
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138 PatternFileError::IO(e)
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139 }
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140 }
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141
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142 impl From<DirstateMapError> for DirstateError {
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143 fn from(e: DirstateMapError) -> Self {
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144 DirstateError::Map(e)
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145 }
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146 }
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147
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148 impl From<std::io::Error> for DirstateError {
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149 fn from(e: std::io::Error) -> Self {
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150 DirstateError::IO(e)
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151 }
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152 }