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annotate rust/hg-core/src/matchers.rs @ 43863:bc7d8f45c3b6

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rust-dirs: handle forgotten `Result`s In 1fe2e574616e I introduced a temporary bugfix to align Rust code with a new behavior from C/Python and forgot about a few `Result`s (cargo's compiler cache does not re-emit warnings on cached modules). This fixes it. For the record, I am still unsure that this behavior change is a good idea. Note: I was already quite unhappy with the setters and getters for the `DirstateMap` and, indirectly, `Dirs`, and this only further reinforces my feelings. I hope we can one day fix that situation at the type level; Georges Racinet and I were just talking about devising a POC for using the builder pattern in the context of FFI with Python, we'll see what comes out of it. Differential Revision: https://phab.mercurial-scm.org/D7609
author Rapha?l Gom?s <rgomes@octobus.net>
date Thu, 12 Dec 2019 15:55:25 +0100
parents 542c8b277261
children 69c4f3cf2cdf
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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;
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11 use std::collections::HashSet;
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12
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13 pub enum VisitChildrenSet<'a> {
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14 /// Don't visit anything
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15 Empty,
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16 /// Only visit this directory
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17 This,
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18 /// Visit this directory and these subdirectories
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19 /// TODO Should we implement a `NonEmptyHashSet`?
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20 Set(HashSet<&'a HgPath>),
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21 /// Visit this directory and all subdirectories
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22 Recursive,
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23 }
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24
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25 pub trait Matcher {
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26 /// Explicitly listed files
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27 fn file_set(&self) -> Option<&HashSet<&HgPath>>;
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28 /// Returns whether `filename` is in `file_set`
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29 fn exact_match(&self, filename: impl AsRef<HgPath>) -> bool;
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30 /// Returns whether `filename` is matched by this matcher
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31 fn matches(&self, filename: impl AsRef<HgPath>) -> bool;
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32 /// Decides whether a directory should be visited based on whether it
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33 /// has potential matches in it or one of its subdirectories, and
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34 /// potentially lists which subdirectories of that directory should be
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35 /// visited. This is based on the match's primary, included, and excluded
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36 /// patterns.
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37 ///
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38 /// # Example
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39 ///
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40 /// Assume matchers `['path:foo/bar', 'rootfilesin:qux']`, we would
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41 /// return the following values (assuming the implementation of
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42 /// visit_children_set is capable of recognizing this; some implementations
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43 /// are not).
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44 ///
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45 /// ```ignore
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46 /// '' -> {'foo', 'qux'}
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47 /// 'baz' -> set()
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48 /// 'foo' -> {'bar'}
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49 /// // Ideally this would be `Recursive`, but since the prefix nature of
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50 /// // matchers is applied to the entire matcher, we have to downgrade this
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51 /// // to `This` due to the (yet to be implemented in Rust) non-prefix
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52 /// // `RootFilesIn'-kind matcher being mixed in.
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53 /// 'foo/bar' -> 'this'
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54 /// 'qux' -> 'this'
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55 /// ```
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56 /// # Important
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57 ///
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58 /// Most matchers do not know if they're representing files or
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59 /// directories. They see `['path:dir/f']` and don't know whether `f` is a
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60 /// file or a directory, so `visit_children_set('dir')` for most matchers
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61 /// will return `HashSet{ HgPath { "f" } }`, but if the matcher knows it's
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62 /// a file (like the yet to be implemented in Rust `ExactMatcher` does),
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63 /// it may return `VisitChildrenSet::This`.
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64 /// Do not rely on the return being a `HashSet` indicating that there are
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65 /// no files in this dir to investigate (or equivalently that if there are
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66 /// files to investigate in 'dir' that it will always return
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67 /// `VisitChildrenSet::This`).
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68 fn visit_children_set(
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69 &self,
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70 directory: impl AsRef<HgPath>,
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71 ) -> VisitChildrenSet;
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72 /// Matcher will match everything and `files_set()` will be empty:
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73 /// optimization might be possible.
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74 fn matches_everything(&self) -> bool;
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75 /// Matcher will match exactly the files in `files_set()`: optimization
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76 /// might be possible.
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77 fn is_exact(&self) -> bool;
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78 }
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79
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80 /// Matches everything.
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81 ///```
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82 /// use hg::{ matchers::{Matcher, AlwaysMatcher}, utils::hg_path::HgPath };
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83 ///
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84 /// let matcher = AlwaysMatcher;
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85 ///
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86 /// assert_eq!(true, matcher.matches(HgPath::new(b"whatever")));
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87 /// assert_eq!(true, matcher.matches(HgPath::new(b"b.txt")));
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88 /// assert_eq!(true, matcher.matches(HgPath::new(b"main.c")));
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89 /// assert_eq!(true, matcher.matches(HgPath::new(br"re:.*\.c$")));
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90 /// ```
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91 #[derive(Debug)]
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92 pub struct AlwaysMatcher;
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93
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94 impl Matcher for AlwaysMatcher {
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95 fn file_set(&self) -> Option<&HashSet<&HgPath>> {
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96 None
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97 }
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98 fn exact_match(&self, _filename: impl AsRef<HgPath>) -> bool {
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99 false
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100 }
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101 fn matches(&self, _filename: impl AsRef<HgPath>) -> bool {
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102 true
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103 }
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104 fn visit_children_set(
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105 &self,
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106 _directory: impl AsRef<HgPath>,
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107 ) -> VisitChildrenSet {
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108 VisitChildrenSet::Recursive
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109 }
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110 fn matches_everything(&self) -> bool {
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111 true
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112 }
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113 fn is_exact(&self) -> bool {
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114 false
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diff changeset
115 }
43438
a77d4fe347a4 rust-matchers: add `Matcher` trait and implement `AlwaysMatcher`
Rapha?l Gom?s <rgomes@octobus.net>
parents:
diff changeset
116 }