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annotate rust/hg-core/src/matchers.rs @ 43945:f98f0e3ddaa1

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rust-index: add a function to convert PyObject index for hg-core Function in hg-core need something implementing the `Graph` trait. Right now, the `hg-cpython` entry points directly turn the PyObject passed as argument into a `cindex::Index`. However, if we start having the option to use an Index in Rust, we need to dispatch between the different possible PyObject we could receive. So move the "duplicate" call into a unified function. When time come. It will be easy to update the logic of all interface when the time come. Differential Revision: https://phab.mercurial-scm.org/D7653
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Fri, 13 Dec 2019 19:59:59 +0100
parents 69c4f3cf2cdf
children 72bced4f2936
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1 // matchers.rs
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2 //
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3 // Copyright 2019 Raphaël Gomès <rgomes@octobus.net>
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4 //
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5 // This software may be used and distributed according to the terms of the
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6 // GNU General Public License version 2 or any later version.
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7
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8 //! Structs and types for matching files and directories.
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9
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10 use crate::{utils::hg_path::HgPath, DirsMultiset, DirstateMapError};
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11 use std::collections::HashSet;
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12 use std::iter::FromIterator;
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13
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14 pub enum VisitChildrenSet<'a> {
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15 /// Don't visit anything
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16 Empty,
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17 /// Only visit this directory
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18 This,
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19 /// Visit this directory and these subdirectories
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20 /// TODO Should we implement a `NonEmptyHashSet`?
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21 Set(HashSet<&'a HgPath>),
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22 /// Visit this directory and all subdirectories
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23 Recursive,
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24 }
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25
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26 pub trait Matcher {
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27 /// Explicitly listed files
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28 fn file_set(&self) -> Option<&HashSet<&HgPath>>;
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29 /// Returns whether `filename` is in `file_set`
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30 fn exact_match(&self, filename: impl AsRef<HgPath>) -> bool;
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31 /// Returns whether `filename` is matched by this matcher
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32 fn matches(&self, filename: impl AsRef<HgPath>) -> bool;
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33 /// Decides whether a directory should be visited based on whether it
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34 /// has potential matches in it or one of its subdirectories, and
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35 /// potentially lists which subdirectories of that directory should be
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36 /// visited. This is based on the match's primary, included, and excluded
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37 /// patterns.
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38 ///
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39 /// # Example
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40 ///
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41 /// Assume matchers `['path:foo/bar', 'rootfilesin:qux']`, we would
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42 /// return the following values (assuming the implementation of
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43 /// visit_children_set is capable of recognizing this; some implementations
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44 /// are not).
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45 ///
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46 /// ```ignore
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47 /// '' -> {'foo', 'qux'}
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48 /// 'baz' -> set()
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49 /// 'foo' -> {'bar'}
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50 /// // Ideally this would be `Recursive`, but since the prefix nature of
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51 /// // matchers is applied to the entire matcher, we have to downgrade this
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52 /// // to `This` due to the (yet to be implemented in Rust) non-prefix
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53 /// // `RootFilesIn'-kind matcher being mixed in.
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54 /// 'foo/bar' -> 'this'
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55 /// 'qux' -> 'this'
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56 /// ```
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57 /// # Important
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58 ///
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59 /// Most matchers do not know if they're representing files or
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60 /// directories. They see `['path:dir/f']` and don't know whether `f` is a
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61 /// file or a directory, so `visit_children_set('dir')` for most matchers
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62 /// will return `HashSet{ HgPath { "f" } }`, but if the matcher knows it's
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63 /// a file (like the yet to be implemented in Rust `ExactMatcher` does),
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64 /// it may return `VisitChildrenSet::This`.
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65 /// Do not rely on the return being a `HashSet` indicating that there are
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66 /// no files in this dir to investigate (or equivalently that if there are
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67 /// files to investigate in 'dir' that it will always return
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68 /// `VisitChildrenSet::This`).
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69 fn visit_children_set(
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70 &self,
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71 directory: impl AsRef<HgPath>,
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72 ) -> VisitChildrenSet;
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73 /// Matcher will match everything and `files_set()` will be empty:
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74 /// optimization might be possible.
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75 fn matches_everything(&self) -> bool;
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76 /// Matcher will match exactly the files in `files_set()`: optimization
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77 /// might be possible.
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78 fn is_exact(&self) -> bool;
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79 }
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80
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81 /// Matches everything.
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82 ///```
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83 /// use hg::{ matchers::{Matcher, AlwaysMatcher}, utils::hg_path::HgPath };
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84 ///
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85 /// let matcher = AlwaysMatcher;
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86 ///
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87 /// assert_eq!(matcher.matches(HgPath::new(b"whatever")), true);
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88 /// assert_eq!(matcher.matches(HgPath::new(b"b.txt")), true);
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89 /// assert_eq!(matcher.matches(HgPath::new(b"main.c")), true);
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90 /// assert_eq!(matcher.matches(HgPath::new(br"re:.*\.c$")), true);
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91 /// ```
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92 #[derive(Debug)]
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93 pub struct AlwaysMatcher;
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94
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95 impl Matcher for AlwaysMatcher {
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96 fn file_set(&self) -> Option<&HashSet<&HgPath>> {
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97 None
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98 }
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99 fn exact_match(&self, _filename: impl AsRef<HgPath>) -> bool {
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100 false
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101 }
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102 fn matches(&self, _filename: impl AsRef<HgPath>) -> bool {
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103 true
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104 }
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105 fn visit_children_set(
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106 &self,
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107 _directory: impl AsRef<HgPath>,
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108 ) -> VisitChildrenSet {
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109 VisitChildrenSet::Recursive
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110 }
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111 fn matches_everything(&self) -> bool {
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112 true
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113 }
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114 fn is_exact(&self) -> bool {
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115 false
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116 }
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117 }
43914
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118
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119 /// Matches the input files exactly. They are interpreted as paths, not
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120 /// patterns.
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121 ///
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122 ///```
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123 /// use hg::{ matchers::{Matcher, FileMatcher}, utils::hg_path::HgPath };
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124 ///
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125 /// let files = [HgPath::new(b"a.txt"), HgPath::new(br"re:.*\.c$")];
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126 /// let matcher = FileMatcher::new(&files).unwrap();
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127 ///
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128 /// assert_eq!(matcher.matches(HgPath::new(b"a.txt")), true);
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129 /// assert_eq!(matcher.matches(HgPath::new(b"b.txt")), false);
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130 /// assert_eq!(matcher.matches(HgPath::new(b"main.c")), false);
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131 /// assert_eq!(matcher.matches(HgPath::new(br"re:.*\.c$")), true);
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132 /// ```
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133 #[derive(Debug)]
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134 pub struct FileMatcher<'a> {
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135 files: HashSet<&'a HgPath>,
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136 dirs: DirsMultiset,
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137 }
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138
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139 impl<'a> FileMatcher<'a> {
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140 pub fn new(
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141 files: &'a [impl AsRef<HgPath>],
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142 ) -> Result<Self, DirstateMapError> {
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143 Ok(Self {
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144 files: HashSet::from_iter(files.iter().map(|f| f.as_ref())),
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145 dirs: DirsMultiset::from_manifest(files)?,
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146 })
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147 }
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148 fn inner_matches(&self, filename: impl AsRef<HgPath>) -> bool {
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149 self.files.contains(filename.as_ref())
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150 }
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151 }
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152
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153 impl<'a> Matcher for FileMatcher<'a> {
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154 fn file_set(&self) -> Option<&HashSet<&HgPath>> {
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155 Some(&self.files)
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156 }
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157 fn exact_match(&self, filename: impl AsRef<HgPath>) -> bool {
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158 self.inner_matches(filename)
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159 }
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160 fn matches(&self, filename: impl AsRef<HgPath>) -> bool {
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161 self.inner_matches(filename)
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162 }
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163 fn visit_children_set(
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164 &self,
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165 _directory: impl AsRef<HgPath>,
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166 ) -> VisitChildrenSet {
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167 // TODO implement once we have `status.traverse`
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168 // This is useless until unknown files are taken into account
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169 // Which will not need to happen before the `IncludeMatcher`.
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170 unimplemented!()
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171 }
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172 fn matches_everything(&self) -> bool {
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173 false
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174 }
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175 fn is_exact(&self) -> bool {
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176 true
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177 }
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178 }