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annotate rust/hg-core/src/matchers.rs @ 44519:52d40f8fb82d

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rust-matchers: add function to generate a regex matcher function This function will be used to help build the upcoming `IncludeMatcher`. While Re2 is still used and behind a feature flag, this function returns an error meant for fallback in the default case. Differential Revision: https://phab.mercurial-scm.org/D7922
author Rapha?l Gom?s <rgomes@octobus.net>
date Fri, 17 Jan 2020 11:29:33 +0100
parents 54d185eb24b5
children d4e8cfcde012
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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 #[cfg(feature = "with-re2")]
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11 use crate::re2::Re2;
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12 use crate::{
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13 filepatterns::PatternResult, utils::hg_path::HgPath, DirsMultiset,
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14 DirstateMapError, PatternError,
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15 };
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16 use std::collections::HashSet;
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17 use std::iter::FromIterator;
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18 use std::ops::Deref;
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19
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20 #[derive(Debug, PartialEq)]
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21 pub enum VisitChildrenSet<'a> {
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22 /// Don't visit anything
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23 Empty,
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24 /// Only visit this directory
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25 This,
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26 /// Visit this directory and these subdirectories
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27 /// TODO Should we implement a `NonEmptyHashSet`?
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28 Set(HashSet<&'a HgPath>),
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29 /// Visit this directory and all subdirectories
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30 Recursive,
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31 }
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32
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33 pub trait Matcher {
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34 /// Explicitly listed files
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35 fn file_set(&self) -> Option<&HashSet<&HgPath>>;
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36 /// Returns whether `filename` is in `file_set`
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37 fn exact_match(&self, filename: impl AsRef<HgPath>) -> bool;
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38 /// Returns whether `filename` is matched by this matcher
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39 fn matches(&self, filename: impl AsRef<HgPath>) -> bool;
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40 /// Decides whether a directory should be visited based on whether it
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41 /// has potential matches in it or one of its subdirectories, and
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42 /// potentially lists which subdirectories of that directory should be
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43 /// visited. This is based on the match's primary, included, and excluded
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44 /// patterns.
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45 ///
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46 /// # Example
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47 ///
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48 /// Assume matchers `['path:foo/bar', 'rootfilesin:qux']`, we would
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49 /// return the following values (assuming the implementation of
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50 /// visit_children_set is capable of recognizing this; some implementations
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51 /// are not).
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52 ///
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53 /// ```text
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54 /// ```ignore
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55 /// '' -> {'foo', 'qux'}
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56 /// 'baz' -> set()
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57 /// 'foo' -> {'bar'}
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58 /// // Ideally this would be `Recursive`, but since the prefix nature of
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59 /// // matchers is applied to the entire matcher, we have to downgrade this
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60 /// // to `This` due to the (yet to be implemented in Rust) non-prefix
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61 /// // `RootFilesIn'-kind matcher being mixed in.
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62 /// 'foo/bar' -> 'this'
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63 /// 'qux' -> 'this'
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64 /// ```
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65 /// # Important
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66 ///
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67 /// Most matchers do not know if they're representing files or
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68 /// directories. They see `['path:dir/f']` and don't know whether `f` is a
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69 /// file or a directory, so `visit_children_set('dir')` for most matchers
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70 /// will return `HashSet{ HgPath { "f" } }`, but if the matcher knows it's
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71 /// a file (like the yet to be implemented in Rust `ExactMatcher` does),
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72 /// it may return `VisitChildrenSet::This`.
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73 /// Do not rely on the return being a `HashSet` indicating that there are
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74 /// no files in this dir to investigate (or equivalently that if there are
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75 /// files to investigate in 'dir' that it will always return
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76 /// `VisitChildrenSet::This`).
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77 fn visit_children_set(
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78 &self,
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79 directory: impl AsRef<HgPath>,
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80 ) -> VisitChildrenSet;
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81 /// Matcher will match everything and `files_set()` will be empty:
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82 /// optimization might be possible.
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83 fn matches_everything(&self) -> bool;
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84 /// Matcher will match exactly the files in `files_set()`: optimization
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85 /// might be possible.
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86 fn is_exact(&self) -> bool;
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87 }
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88
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89 /// Matches everything.
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90 ///```
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91 /// use hg::{ matchers::{Matcher, AlwaysMatcher}, utils::hg_path::HgPath };
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92 ///
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93 /// let matcher = AlwaysMatcher;
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94 ///
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95 /// assert_eq!(matcher.matches(HgPath::new(b"whatever")), true);
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96 /// assert_eq!(matcher.matches(HgPath::new(b"b.txt")), true);
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97 /// assert_eq!(matcher.matches(HgPath::new(b"main.c")), true);
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98 /// assert_eq!(matcher.matches(HgPath::new(br"re:.*\.c$")), true);
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99 /// ```
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100 #[derive(Debug)]
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101 pub struct AlwaysMatcher;
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102
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103 impl Matcher for AlwaysMatcher {
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104 fn file_set(&self) -> Option<&HashSet<&HgPath>> {
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105 None
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106 }
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107 fn exact_match(&self, _filename: impl AsRef<HgPath>) -> bool {
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108 false
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109 }
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110 fn matches(&self, _filename: impl AsRef<HgPath>) -> bool {
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111 true
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112 }
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113 fn visit_children_set(
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114 &self,
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115 _directory: impl AsRef<HgPath>,
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116 ) -> VisitChildrenSet {
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117 VisitChildrenSet::Recursive
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118 }
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119 fn matches_everything(&self) -> bool {
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120 true
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121 }
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122 fn is_exact(&self) -> bool {
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123 false
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124 }
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125 }
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126
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127 /// Matches the input files exactly. They are interpreted as paths, not
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128 /// patterns.
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129 ///
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130 ///```
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131 /// use hg::{ matchers::{Matcher, FileMatcher}, utils::hg_path::HgPath };
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132 ///
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133 /// let files = [HgPath::new(b"a.txt"), HgPath::new(br"re:.*\.c$")];
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134 /// let matcher = FileMatcher::new(&files).unwrap();
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135 ///
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136 /// assert_eq!(matcher.matches(HgPath::new(b"a.txt")), true);
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137 /// assert_eq!(matcher.matches(HgPath::new(b"b.txt")), false);
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138 /// assert_eq!(matcher.matches(HgPath::new(b"main.c")), false);
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139 /// assert_eq!(matcher.matches(HgPath::new(br"re:.*\.c$")), true);
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140 /// ```
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141 #[derive(Debug)]
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142 pub struct FileMatcher<'a> {
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143 files: HashSet<&'a HgPath>,
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144 dirs: DirsMultiset,
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145 }
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146
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147 impl<'a> FileMatcher<'a> {
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148 pub fn new(
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149 files: &'a [impl AsRef<HgPath>],
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150 ) -> Result<Self, DirstateMapError> {
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151 Ok(Self {
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152 files: HashSet::from_iter(files.iter().map(|f| f.as_ref())),
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153 dirs: DirsMultiset::from_manifest(files)?,
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154 })
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155 }
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156 fn inner_matches(&self, filename: impl AsRef<HgPath>) -> bool {
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157 self.files.contains(filename.as_ref())
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158 }
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159 }
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160
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161 impl<'a> Matcher for FileMatcher<'a> {
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162 fn file_set(&self) -> Option<&HashSet<&HgPath>> {
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163 Some(&self.files)
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164 }
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165 fn exact_match(&self, filename: impl AsRef<HgPath>) -> bool {
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166 self.inner_matches(filename)
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167 }
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168 fn matches(&self, filename: impl AsRef<HgPath>) -> bool {
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169 self.inner_matches(filename)
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170 }
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171 fn visit_children_set(
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172 &self,
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173 directory: impl AsRef<HgPath>,
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174 ) -> VisitChildrenSet {
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175 if self.files.is_empty() || !self.dirs.contains(&directory) {
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176 return VisitChildrenSet::Empty;
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177 }
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178 let dirs_as_set = self.dirs.iter().map(|k| k.deref()).collect();
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179
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180 let mut candidates: HashSet<&HgPath> =
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181 self.files.union(&dirs_as_set).map(|k| *k).collect();
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182 candidates.remove(HgPath::new(b""));
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183
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184 if !directory.as_ref().is_empty() {
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185 let directory = [directory.as_ref().as_bytes(), b"/"].concat();
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186 candidates = candidates
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187 .iter()
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188 .filter_map(|c| {
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189 if c.as_bytes().starts_with(&directory) {
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190 Some(HgPath::new(&c.as_bytes()[directory.len()..]))
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191 } else {
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192 None
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193 }
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194 })
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195 .collect();
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196 }
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197
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198 // `self.dirs` includes all of the directories, recursively, so if
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199 // we're attempting to match 'foo/bar/baz.txt', it'll have '', 'foo',
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200 // 'foo/bar' in it. Thus we can safely ignore a candidate that has a
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201 // '/' in it, indicating it's for a subdir-of-a-subdir; the immediate
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202 // subdir will be in there without a slash.
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203 VisitChildrenSet::Set(
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204 candidates
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205 .iter()
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206 .filter_map(|c| {
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207 if c.bytes().all(|b| *b != b'/') {
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208 Some(*c)
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209 } else {
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210 None
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211 }
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212 })
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213 .collect(),
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214 )
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215 }
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216 fn matches_everything(&self) -> bool {
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217 false
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218 }
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219 fn is_exact(&self) -> bool {
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220 true
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221 }
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222 }
44519
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223
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224 #[cfg(feature = "with-re2")]
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225 /// Returns a function that matches an `HgPath` against the given regex
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226 /// pattern.
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227 ///
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228 /// This can fail when the pattern is invalid or not supported by the
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229 /// underlying engine `Re2`, for instance anything with back-references.
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230 fn re_matcher(
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231 pattern: &[u8],
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232 ) -> PatternResult<impl Fn(&HgPath) -> bool + Sync> {
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233 let regex = Re2::new(pattern);
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234 let regex = regex.map_err(|e| PatternError::UnsupportedSyntax(e))?;
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235 Ok(move |path: &HgPath| regex.is_match(path.as_bytes()))
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236 }
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237
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238 #[cfg(not(feature = "with-re2"))]
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239 fn re_matcher(_: &[u8]) -> PatternResult<Box<dyn Fn(&HgPath) -> bool + Sync>> {
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240 Err(PatternError::Re2NotInstalled)
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241 }
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242
44353
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243 #[cfg(test)]
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244 mod tests {
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245 use super::*;
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246 use pretty_assertions::assert_eq;
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247
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248 #[test]
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249 fn test_filematcher_visit_children_set() {
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250 // Visitchildrenset
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251 let files = vec![HgPath::new(b"dir/subdir/foo.txt")];
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252 let matcher = FileMatcher::new(&files).unwrap();
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253
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254 let mut set = HashSet::new();
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255 set.insert(HgPath::new(b"dir"));
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256 assert_eq!(
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257 matcher.visit_children_set(HgPath::new(b"")),
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258 VisitChildrenSet::Set(set)
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259 );
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260
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261 let mut set = HashSet::new();
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262 set.insert(HgPath::new(b"subdir"));
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263 assert_eq!(
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264 matcher.visit_children_set(HgPath::new(b"dir")),
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265 VisitChildrenSet::Set(set)
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266 );
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267
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268 let mut set = HashSet::new();
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269 set.insert(HgPath::new(b"foo.txt"));
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270 assert_eq!(
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271 matcher.visit_children_set(HgPath::new(b"dir/subdir")),
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272 VisitChildrenSet::Set(set)
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273 );
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274
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275 assert_eq!(
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276 matcher.visit_children_set(HgPath::new(b"dir/subdir/x")),
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277 VisitChildrenSet::Empty
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278 );
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279 assert_eq!(
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280 matcher.visit_children_set(HgPath::new(b"dir/subdir/foo.txt")),
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281 VisitChildrenSet::Empty
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282 );
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283 assert_eq!(
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284 matcher.visit_children_set(HgPath::new(b"folder")),
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285 VisitChildrenSet::Empty
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286 );
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287 }
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288
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289 #[test]
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290 fn test_filematcher_visit_children_set_files_and_dirs() {
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291 let files = vec![
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292 HgPath::new(b"rootfile.txt"),
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293 HgPath::new(b"a/file1.txt"),
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294 HgPath::new(b"a/b/file2.txt"),
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295 // No file in a/b/c
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296 HgPath::new(b"a/b/c/d/file4.txt"),
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297 ];
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298 let matcher = FileMatcher::new(&files).unwrap();
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299
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300 let mut set = HashSet::new();
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301 set.insert(HgPath::new(b"a"));
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302 set.insert(HgPath::new(b"rootfile.txt"));
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303 assert_eq!(
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304 matcher.visit_children_set(HgPath::new(b"")),
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305 VisitChildrenSet::Set(set)
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306 );
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307
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308 let mut set = HashSet::new();
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309 set.insert(HgPath::new(b"b"));
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310 set.insert(HgPath::new(b"file1.txt"));
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311 assert_eq!(
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312 matcher.visit_children_set(HgPath::new(b"a")),
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313 VisitChildrenSet::Set(set)
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314 );
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315
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316 let mut set = HashSet::new();
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317 set.insert(HgPath::new(b"c"));
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318 set.insert(HgPath::new(b"file2.txt"));
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319 assert_eq!(
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320 matcher.visit_children_set(HgPath::new(b"a/b")),
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321 VisitChildrenSet::Set(set)
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322 );
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323
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324 let mut set = HashSet::new();
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325 set.insert(HgPath::new(b"d"));
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326 assert_eq!(
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327 matcher.visit_children_set(HgPath::new(b"a/b/c")),
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328 VisitChildrenSet::Set(set)
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329 );
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330 let mut set = HashSet::new();
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331 set.insert(HgPath::new(b"file4.txt"));
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332 assert_eq!(
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333 matcher.visit_children_set(HgPath::new(b"a/b/c/d")),
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334 VisitChildrenSet::Set(set)
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335 );
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336
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337 assert_eq!(
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338 matcher.visit_children_set(HgPath::new(b"a/b/c/d/e")),
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339 VisitChildrenSet::Empty
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340 );
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341 assert_eq!(
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342 matcher.visit_children_set(HgPath::new(b"folder")),
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343 VisitChildrenSet::Empty
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344 );
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345 }
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346 }