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@@ -1,395 +1,398 b'' | |||
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1 | 1 | // node.rs |
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2 | 2 | // |
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3 | 3 | // Copyright 2020, Raphaël Gomès <rgomes@octobus.net> |
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4 | 4 | // |
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5 | 5 | // This software may be used and distributed according to the terms of the |
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6 | 6 | // GNU General Public License version 2 or any later version. |
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7 | 7 | |
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8 | 8 | use super::iter::Iter; |
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9 | 9 | use crate::utils::hg_path::HgPathBuf; |
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10 | 10 | use crate::{DirstateEntry, EntryState, FastHashMap}; |
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11 | 11 | |
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12 | 12 | /// Represents a filesystem directory in the dirstate tree |
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13 | 13 | #[derive(Debug, Default, Clone, PartialEq)] |
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14 | 14 | pub struct Directory { |
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15 | 15 | /// Contains the old file information if it existed between changesets. |
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16 | 16 | /// Happens if a file `foo` is marked as removed, removed from the |
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17 | 17 | /// filesystem then a directory `foo` is created and at least one of its |
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18 | 18 | /// descendents is added to Mercurial. |
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19 | 19 | pub(super) was_file: Option<Box<File>>, |
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20 | 20 | pub(super) children: FastHashMap<Vec<u8>, Node>, |
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21 | 21 | } |
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22 | 22 | |
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23 | 23 | /// Represents a filesystem file (or symlink) in the dirstate tree |
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24 | 24 | #[derive(Debug, Clone, PartialEq)] |
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25 | 25 | pub struct File { |
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26 | 26 | /// Contains the old structure if it existed between changesets. |
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27 | 27 | /// Happens all descendents of `foo` marked as removed and removed from |
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28 | 28 | /// the filesystem, then a file `foo` is created and added to Mercurial. |
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29 | 29 | pub(super) was_directory: Option<Box<Directory>>, |
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30 | 30 | pub(super) entry: DirstateEntry, |
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31 | 31 | } |
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32 | 32 | |
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33 | 33 | #[derive(Debug, Clone, PartialEq)] |
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34 | 34 | pub enum NodeKind { |
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35 | 35 | Directory(Directory), |
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36 | 36 | File(File), |
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37 | 37 | } |
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38 | 38 | |
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39 | 39 | #[derive(Debug, Default, Clone, PartialEq)] |
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40 | 40 | pub struct Node { |
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41 | 41 | pub kind: NodeKind, |
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42 | 42 | } |
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43 | 43 | |
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44 | 44 | impl Default for NodeKind { |
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45 | 45 | fn default() -> Self { |
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46 | 46 | NodeKind::Directory(Default::default()) |
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47 | 47 | } |
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48 | 48 | } |
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49 | 49 | |
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50 | 50 | impl Node { |
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51 | 51 | pub fn insert( |
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52 | 52 | &mut self, |
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53 | 53 | path: &[u8], |
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54 | 54 | new_entry: DirstateEntry, |
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55 | 55 | ) -> InsertResult { |
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56 | 56 | let mut split = path.splitn(2, |&c| c == b'/'); |
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57 | 57 | let head = split.next().unwrap_or(b""); |
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58 | 58 | let tail = split.next().unwrap_or(b""); |
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59 | 59 | |
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60 | 60 | // Are we're modifying the current file ? Is the the end of the path ? |
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61 | 61 | let is_current_file = tail.is_empty() && head.is_empty(); |
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62 | 62 | |
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63 | if let NodeKind::File(file) = &mut self.kind { | |
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64 | if is_current_file { | |
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65 | let new = Self { | |
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66 |
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67 | entry: new_entry, | |
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68 | ..file.clone() | |
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69 | }), | |
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70 | }; | |
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71 |
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72 | did_insert: false, | |
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73 | old_entry: Some(std::mem::replace(self, new)), | |
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74 | }; | |
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75 | } else { | |
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76 | match file.entry.state { | |
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77 | // Only replace the current file with a directory if it's | |
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78 | // marked as `Removed` | |
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79 | EntryState::Removed => { | |
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80 | self.kind = NodeKind::Directory(Directory { | |
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81 | was_file: Some(Box::from(file.clone())), | |
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82 | children: Default::default(), | |
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83 | }) | |
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84 | } | |
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85 | _ => { | |
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86 | return Node::insert_in_file( | |
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87 | file, new_entry, head, tail, | |
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88 | ) | |
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89 | } | |
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63 | // Potentially Replace the current file with a directory if it's marked | |
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64 | // as `Removed` | |
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65 | if !is_current_file { | |
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66 | if let NodeKind::File(file) = &mut self.kind { | |
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67 | if file.entry.state == EntryState::Removed { | |
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68 | self.kind = NodeKind::Directory(Directory { | |
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69 | was_file: Some(Box::from(file.clone())), | |
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70 | children: Default::default(), | |
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71 | }) | |
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90 | 72 | } |
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91 | 73 | } |
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92 | 74 | } |
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93 | ||
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94 | 75 | match &mut self.kind { |
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95 | 76 | NodeKind::Directory(directory) => { |
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96 | 77 | Node::insert_in_directory(directory, new_entry, head, tail) |
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97 | 78 | } |
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98 |
NodeKind::File( |
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99 | unreachable!("The file case has already been handled") | |
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79 | NodeKind::File(file) => { | |
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80 | if is_current_file { | |
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81 | let new = Self { | |
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82 | kind: NodeKind::File(File { | |
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83 | entry: new_entry, | |
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84 | ..file.clone() | |
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85 | }), | |
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86 | }; | |
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87 | InsertResult { | |
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88 | did_insert: false, | |
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89 | old_entry: Some(std::mem::replace(self, new)), | |
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90 | } | |
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91 | } else { | |
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92 | match file.entry.state { | |
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93 | EntryState::Removed => { | |
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94 | unreachable!("Removed file turning into a directory was dealt with earlier") | |
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95 | } | |
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96 | _ => { | |
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97 | Node::insert_in_file( | |
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98 | file, new_entry, head, tail, | |
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99 | ) | |
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100 | } | |
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101 | } | |
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102 | } | |
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100 | 103 | } |
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101 | 104 | } |
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102 | 105 | } |
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103 | 106 | |
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104 | 107 | /// The current file still exists and is not marked as `Removed`. |
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105 | 108 | /// Insert the entry in its `was_directory`. |
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106 | 109 | fn insert_in_file( |
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107 | 110 | file: &mut File, |
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108 | 111 | new_entry: DirstateEntry, |
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109 | 112 | head: &[u8], |
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110 | 113 | tail: &[u8], |
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111 | 114 | ) -> InsertResult { |
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112 | 115 | if let Some(d) = &mut file.was_directory { |
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113 | 116 | Node::insert_in_directory(d, new_entry, head, tail) |
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114 | 117 | } else { |
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115 | 118 | let mut dir = Directory { |
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116 | 119 | was_file: None, |
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117 | 120 | children: FastHashMap::default(), |
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118 | 121 | }; |
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119 | 122 | let res = |
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120 | 123 | Node::insert_in_directory(&mut dir, new_entry, head, tail); |
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121 | 124 | file.was_directory = Some(Box::new(dir)); |
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122 | 125 | res |
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123 | 126 | } |
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124 | 127 | } |
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125 | 128 | |
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126 | 129 | /// Insert an entry in the subtree of `directory` |
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127 | 130 | fn insert_in_directory( |
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128 | 131 | directory: &mut Directory, |
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129 | 132 | new_entry: DirstateEntry, |
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130 | 133 | head: &[u8], |
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131 | 134 | tail: &[u8], |
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132 | 135 | ) -> InsertResult { |
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133 | 136 | let mut res = InsertResult::default(); |
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134 | 137 | |
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135 | 138 | if let Some(node) = directory.children.get_mut(head) { |
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136 | 139 | // Node exists |
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137 | 140 | match &mut node.kind { |
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138 | 141 | NodeKind::Directory(subdir) => { |
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139 | 142 | if tail.is_empty() { |
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140 | 143 | let becomes_file = Self { |
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141 | 144 | kind: NodeKind::File(File { |
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142 | 145 | was_directory: Some(Box::from(subdir.clone())), |
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143 | 146 | entry: new_entry, |
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144 | 147 | }), |
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145 | 148 | }; |
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146 | 149 | let old_entry = directory |
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147 | 150 | .children |
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148 | 151 | .insert(head.to_owned(), becomes_file); |
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149 | 152 | return InsertResult { |
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150 | 153 | did_insert: true, |
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151 | 154 | old_entry, |
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152 | 155 | }; |
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153 | 156 | } else { |
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154 | 157 | res = node.insert(tail, new_entry); |
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155 | 158 | } |
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156 | 159 | } |
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157 | 160 | NodeKind::File(_) => { |
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158 | 161 | res = node.insert(tail, new_entry); |
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159 | 162 | } |
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160 | 163 | } |
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161 | 164 | } else if tail.is_empty() { |
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162 | 165 | // File does not already exist |
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163 | 166 | directory.children.insert( |
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164 | 167 | head.to_owned(), |
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165 | 168 | Self { |
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166 | 169 | kind: NodeKind::File(File { |
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167 | 170 | was_directory: None, |
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168 | 171 | entry: new_entry, |
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169 | 172 | }), |
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170 | 173 | }, |
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171 | 174 | ); |
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172 | 175 | res.did_insert = true; |
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173 | 176 | } else { |
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174 | 177 | // Directory does not already exist |
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175 | 178 | let mut nested = Self { |
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176 | 179 | kind: NodeKind::Directory(Directory { |
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177 | 180 | was_file: None, |
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178 | 181 | children: Default::default(), |
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179 | 182 | }), |
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180 | 183 | }; |
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181 | 184 | res = nested.insert(tail, new_entry); |
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182 | 185 | directory.children.insert(head.to_owned(), nested); |
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183 | 186 | } |
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184 | 187 | res |
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185 | 188 | } |
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186 | 189 | |
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187 | 190 | /// Removes an entry from the tree, returns a `RemoveResult`. |
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188 | 191 | pub fn remove(&mut self, path: &[u8]) -> RemoveResult { |
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189 | 192 | let empty_result = RemoveResult::default(); |
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190 | 193 | if path.is_empty() { |
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191 | 194 | return empty_result; |
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192 | 195 | } |
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193 | 196 | let mut split = path.splitn(2, |&c| c == b'/'); |
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194 | 197 | let head = split.next(); |
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195 | 198 | let tail = split.next().unwrap_or(b""); |
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196 | 199 | |
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197 | 200 | let head = match head { |
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198 | 201 | None => { |
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199 | 202 | return empty_result; |
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200 | 203 | } |
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201 | 204 | Some(h) => h, |
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202 | 205 | }; |
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203 | 206 | if head == path { |
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204 | 207 | match &mut self.kind { |
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205 | 208 | NodeKind::Directory(d) => { |
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206 | 209 | return Node::remove_from_directory(head, d); |
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207 | 210 | } |
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208 | 211 | NodeKind::File(f) => { |
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209 | 212 | if let Some(d) = &mut f.was_directory { |
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210 | 213 | let RemoveResult { old_entry, .. } = |
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211 | 214 | Node::remove_from_directory(head, d); |
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212 | 215 | return RemoveResult { |
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213 | 216 | cleanup: false, |
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214 | 217 | old_entry, |
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215 | 218 | }; |
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216 | 219 | } |
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217 | 220 | } |
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218 | 221 | } |
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219 | 222 | empty_result |
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220 | 223 | } else { |
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221 | 224 | // Look into the dirs |
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222 | 225 | match &mut self.kind { |
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223 | 226 | NodeKind::Directory(d) => { |
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224 | 227 | if let Some(child) = d.children.get_mut(head) { |
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225 | 228 | let mut res = child.remove(tail); |
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226 | 229 | if res.cleanup { |
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227 | 230 | d.children.remove(head); |
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228 | 231 | } |
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229 | 232 | res.cleanup = |
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230 | 233 | d.children.is_empty() && d.was_file.is_none(); |
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231 | 234 | res |
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232 | 235 | } else { |
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233 | 236 | empty_result |
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234 | 237 | } |
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235 | 238 | } |
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236 | 239 | NodeKind::File(f) => { |
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237 | 240 | if let Some(d) = &mut f.was_directory { |
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238 | 241 | if let Some(child) = d.children.get_mut(head) { |
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239 | 242 | let RemoveResult { cleanup, old_entry } = |
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240 | 243 | child.remove(tail); |
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241 | 244 | if cleanup { |
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242 | 245 | d.children.remove(head); |
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243 | 246 | } |
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244 | 247 | if d.children.is_empty() && d.was_file.is_none() { |
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245 | 248 | f.was_directory = None; |
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246 | 249 | } |
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247 | 250 | |
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248 | 251 | return RemoveResult { |
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249 | 252 | cleanup: false, |
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250 | 253 | old_entry, |
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251 | 254 | }; |
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252 | 255 | } |
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253 | 256 | } |
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254 | 257 | empty_result |
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255 | 258 | } |
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256 | 259 | } |
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257 | 260 | } |
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258 | 261 | } |
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259 | 262 | |
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260 | 263 | fn remove_from_directory(head: &[u8], d: &mut Directory) -> RemoveResult { |
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261 | 264 | if let Some(node) = d.children.get_mut(head) { |
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262 | 265 | return match &mut node.kind { |
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263 | 266 | NodeKind::Directory(d) => { |
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264 | 267 | if let Some(f) = &mut d.was_file { |
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265 | 268 | let entry = f.entry; |
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266 | 269 | d.was_file = None; |
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267 | 270 | RemoveResult { |
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268 | 271 | cleanup: false, |
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269 | 272 | old_entry: Some(entry), |
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270 | 273 | } |
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271 | 274 | } else { |
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272 | 275 | RemoveResult::default() |
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273 | 276 | } |
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274 | 277 | } |
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275 | 278 | NodeKind::File(f) => { |
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276 | 279 | let entry = f.entry; |
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277 | 280 | let mut cleanup = false; |
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278 | 281 | match &f.was_directory { |
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279 | 282 | None => { |
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280 | 283 | if d.children.len() == 1 { |
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281 | 284 | cleanup = true; |
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282 | 285 | } |
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283 | 286 | d.children.remove(head); |
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284 | 287 | } |
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285 | 288 | Some(dir) => { |
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286 | 289 | node.kind = NodeKind::Directory(*dir.clone()); |
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287 | 290 | } |
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288 | 291 | } |
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289 | 292 | |
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290 | 293 | RemoveResult { |
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291 | 294 | cleanup, |
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292 | 295 | old_entry: Some(entry), |
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293 | 296 | } |
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294 | 297 | } |
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295 | 298 | }; |
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296 | 299 | } |
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297 | 300 | RemoveResult::default() |
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298 | 301 | } |
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299 | 302 | |
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300 | 303 | pub fn get(&self, path: &[u8]) -> Option<&Node> { |
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301 | 304 | if path.is_empty() { |
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302 | 305 | return Some(&self); |
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303 | 306 | } |
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304 | 307 | let mut split = path.splitn(2, |&c| c == b'/'); |
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305 | 308 | let head = split.next(); |
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306 | 309 | let tail = split.next().unwrap_or(b""); |
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307 | 310 | |
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308 | 311 | let head = match head { |
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309 | 312 | None => { |
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310 | 313 | return Some(&self); |
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311 | 314 | } |
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312 | 315 | Some(h) => h, |
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313 | 316 | }; |
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314 | 317 | match &self.kind { |
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315 | 318 | NodeKind::Directory(d) => { |
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316 | 319 | if let Some(child) = d.children.get(head) { |
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317 | 320 | return child.get(tail); |
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318 | 321 | } |
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319 | 322 | } |
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320 | 323 | NodeKind::File(f) => { |
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321 | 324 | if let Some(d) = &f.was_directory { |
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322 | 325 | if let Some(child) = d.children.get(head) { |
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323 | 326 | return child.get(tail); |
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324 | 327 | } |
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325 | 328 | } |
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326 | 329 | } |
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327 | 330 | } |
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328 | 331 | |
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329 | 332 | None |
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330 | 333 | } |
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331 | 334 | |
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332 | 335 | pub fn get_mut(&mut self, path: &[u8]) -> Option<&mut NodeKind> { |
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333 | 336 | if path.is_empty() { |
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334 | 337 | return Some(&mut self.kind); |
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335 | 338 | } |
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336 | 339 | let mut split = path.splitn(2, |&c| c == b'/'); |
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337 | 340 | let head = split.next(); |
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338 | 341 | let tail = split.next().unwrap_or(b""); |
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339 | 342 | |
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340 | 343 | let head = match head { |
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341 | 344 | None => { |
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342 | 345 | return Some(&mut self.kind); |
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343 | 346 | } |
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344 | 347 | Some(h) => h, |
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345 | 348 | }; |
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346 | 349 | match &mut self.kind { |
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347 | 350 | NodeKind::Directory(d) => { |
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348 | 351 | if let Some(child) = d.children.get_mut(head) { |
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349 | 352 | return child.get_mut(tail); |
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350 | 353 | } |
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351 | 354 | } |
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352 | 355 | NodeKind::File(f) => { |
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353 | 356 | if let Some(d) = &mut f.was_directory { |
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354 | 357 | if let Some(child) = d.children.get_mut(head) { |
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355 | 358 | return child.get_mut(tail); |
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356 | 359 | } |
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357 | 360 | } |
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358 | 361 | } |
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359 | 362 | } |
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360 | 363 | |
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361 | 364 | None |
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362 | 365 | } |
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363 | 366 | |
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364 | 367 | pub fn iter(&self) -> Iter { |
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365 | 368 | Iter::new(self) |
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366 | 369 | } |
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367 | 370 | } |
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368 | 371 | |
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369 | 372 | /// Information returned to the caller of an `insert` operation for integrity. |
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370 | 373 | #[derive(Debug, Default)] |
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371 | 374 | pub struct InsertResult { |
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372 | 375 | /// Whether the insertion resulted in an actual insertion and not an |
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373 | 376 | /// update |
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374 | 377 | pub(super) did_insert: bool, |
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375 | 378 | /// The entry that was replaced, if it exists |
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376 | 379 | pub(super) old_entry: Option<Node>, |
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377 | 380 | } |
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378 | 381 | |
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379 | 382 | /// Information returned to the caller of a `remove` operation integrity. |
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380 | 383 | #[derive(Debug, Default)] |
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381 | 384 | pub struct RemoveResult { |
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382 | 385 | /// If the caller needs to remove the current node |
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383 | 386 | pub(super) cleanup: bool, |
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384 | 387 | /// The entry that was replaced, if it exists |
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385 | 388 | pub(super) old_entry: Option<DirstateEntry>, |
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386 | 389 | } |
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387 | 390 | |
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388 | 391 | impl<'a> IntoIterator for &'a Node { |
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389 | 392 | type Item = (HgPathBuf, DirstateEntry); |
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390 | 393 | type IntoIter = Iter<'a>; |
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391 | 394 | |
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392 | 395 | fn into_iter(self) -> Self::IntoIter { |
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393 | 396 | self.iter() |
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394 | 397 | } |
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395 | 398 | } |
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