Mercurial > hg
annotate rust/hg-core/src/dirstate_tree/dirstate_map.rs @ 47106:52906934b775
dirstate-tree: Add has_dir and has_tracked_dir
A node without a `DirstateMap` entry represents a directory.
Only some values of `EntryState` represent tracked files.
A directory is considered "tracked" if it contains any descendant file that
is tracked. To avoid a sub-tree traversal in `has_tracked_dir` we add a
counter for this. A boolean flag would become insufficent when we implement
remove_file and drop_file.
`add_file_node` is more general than needed here, in anticipation of adding
the `add_file` and `remove_file` methods.
Differential Revision: https://phab.mercurial-scm.org/D10490
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Mon, 12 Apr 2021 19:46:24 +0200 |
parents | ba17a2ee85ac |
children | 7dfc598ddcfe |
rev | line source |
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1 use bytes_cast::BytesCast; |
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2 use std::path::PathBuf; |
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3 use std::{collections::BTreeMap, convert::TryInto}; |
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4 |
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5 use super::path_with_basename::WithBasename; |
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6 use crate::dirstate::parsers::clear_ambiguous_mtime; |
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7 use crate::dirstate::parsers::pack_entry; |
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8 use crate::dirstate::parsers::packed_entry_size; |
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9 use crate::dirstate::parsers::parse_dirstate_entries; |
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10 use crate::dirstate::parsers::parse_dirstate_parents; |
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11 use crate::dirstate::parsers::Timestamp; |
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12 use crate::matchers::Matcher; |
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13 use crate::revlog::node::NULL_NODE; |
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14 use crate::utils::hg_path::{HgPath, HgPathBuf}; |
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15 use crate::CopyMapIter; |
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16 use crate::DirstateEntry; |
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17 use crate::DirstateError; |
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18 use crate::DirstateMapError; |
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19 use crate::DirstateParents; |
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20 use crate::DirstateStatus; |
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21 use crate::EntryState; |
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22 use crate::FastHashMap; |
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23 use crate::HgPathCow; |
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24 use crate::PatternFileWarning; |
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25 use crate::StateMapIter; |
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26 use crate::StatusError; |
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27 use crate::StatusOptions; |
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28 |
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29 pub struct DirstateMap { |
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30 parents: Option<DirstateParents>, |
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31 dirty_parents: bool, |
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32 root: ChildNodes, |
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33 |
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34 /// Number of nodes anywhere in the tree that have `.entry.is_some()`. |
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35 nodes_with_entry_count: usize, |
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36 |
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37 /// Number of nodes anywhere in the tree that have |
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38 /// `.copy_source.is_some()`. |
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39 nodes_with_copy_source_count: usize, |
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40 } |
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41 |
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42 /// Using a plain `HgPathBuf` of the full path from the repository root as a |
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43 /// map key would also work: all paths in a given map have the same parent |
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44 /// path, so comparing full paths gives the same result as comparing base |
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45 /// names. However `BTreeMap` would waste time always re-comparing the same |
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46 /// string prefix. |
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47 type ChildNodes = BTreeMap<WithBasename<HgPathBuf>, Node>; |
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48 |
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49 /// Represents a file or a directory |
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50 #[derive(Default)] |
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51 struct Node { |
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52 /// `None` for directories |
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53 entry: Option<DirstateEntry>, |
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54 |
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55 copy_source: Option<HgPathBuf>, |
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56 |
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57 children: ChildNodes, |
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58 |
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59 /// How many (non-inclusive) descendants of this node are tracked files |
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60 tracked_descendants_count: usize, |
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61 } |
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62 |
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63 impl Node { |
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64 /// Whether this node has a `DirstateEntry` with `.state.is_tracked()` |
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65 fn is_tracked_file(&self) -> bool { |
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66 if let Some(entry) = &self.entry { |
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67 entry.state.is_tracked() |
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68 } else { |
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69 false |
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70 } |
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71 } |
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72 } |
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73 |
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74 /// `(full_path, entry, copy_source)` |
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75 type NodeDataMut<'a> = ( |
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76 &'a WithBasename<HgPathBuf>, |
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77 &'a mut Option<DirstateEntry>, |
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78 &'a mut Option<HgPathBuf>, |
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79 ); |
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80 |
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81 impl DirstateMap { |
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82 pub fn new() -> Self { |
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83 Self { |
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84 parents: None, |
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85 dirty_parents: false, |
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86 root: ChildNodes::new(), |
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87 nodes_with_entry_count: 0, |
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88 nodes_with_copy_source_count: 0, |
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89 } |
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90 } |
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91 |
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92 fn get_node(&self, path: &HgPath) -> Option<&Node> { |
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93 let mut children = &self.root; |
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94 let mut components = path.components(); |
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95 let mut component = |
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96 components.next().expect("expected at least one components"); |
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97 loop { |
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98 let child = children.get(component)?; |
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99 if let Some(next_component) = components.next() { |
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100 component = next_component; |
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101 children = &child.children; |
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102 } else { |
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103 return Some(child); |
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104 } |
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105 } |
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106 } |
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107 |
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108 /// Returns a mutable reference to the node at `path` if it exists |
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109 /// |
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110 /// This takes `root` instead of `&mut self` so that callers can mutate |
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111 /// other fields while the returned borrow is still valid |
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112 fn get_node_mut<'tree>( |
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113 root: &'tree mut ChildNodes, |
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114 path: &HgPath, |
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115 ) -> Option<&'tree mut Node> { |
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116 Self::each_and_get(root, path, |_| {}) |
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117 } |
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118 |
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119 /// Call `each` for each ancestor node of the one at `path` (not including |
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120 /// that node itself), starting from nearest the root. |
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121 /// |
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122 /// Panics (possibly after some calls to `each`) if there is no node at |
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123 /// `path`. |
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124 fn for_each_ancestor_node<'tree>( |
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125 &mut self, |
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126 path: &HgPath, |
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127 each: impl FnMut(&mut Node), |
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128 ) { |
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129 let parent = path.parent(); |
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130 if !parent.is_empty() { |
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131 Self::each_and_get(&mut self.root, parent, each) |
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132 .expect("missing dirstate node"); |
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133 } |
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134 } |
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135 |
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136 /// Common implementation detail of `get_node_mut` and |
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137 /// `for_each_ancestor_node` |
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138 fn each_and_get<'tree>( |
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139 root: &'tree mut ChildNodes, |
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140 path: &HgPath, |
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141 mut each: impl FnMut(&mut Node), |
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142 ) -> Option<&'tree mut Node> { |
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143 let mut children = root; |
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144 let mut components = path.components(); |
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145 let mut component = |
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146 components.next().expect("expected at least one components"); |
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147 loop { |
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148 let child = children.get_mut(component)?; |
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149 each(child); |
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150 if let Some(next_component) = components.next() { |
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151 component = next_component; |
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152 children = &mut child.children; |
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153 } else { |
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154 return Some(child); |
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155 } |
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156 } |
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157 } |
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158 |
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159 fn get_or_insert_node<'tree>( |
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160 root: &'tree mut ChildNodes, |
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161 path: &HgPath, |
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162 ) -> &'tree mut Node { |
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163 let mut child_nodes = root; |
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164 let mut inclusive_ancestor_paths = |
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165 WithBasename::inclusive_ancestors_of(path); |
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166 let mut ancestor_path = inclusive_ancestor_paths |
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167 .next() |
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168 .expect("expected at least one inclusive ancestor"); |
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169 loop { |
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170 // TODO: can we avoid double lookup in all cases without allocating |
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171 // an owned key in cases where the map already contains that key? |
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172 let child_node = |
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173 if child_nodes.contains_key(ancestor_path.base_name()) { |
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174 child_nodes.get_mut(ancestor_path.base_name()).unwrap() |
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175 } else { |
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176 // This is always a vacant entry, using `.entry()` lets us |
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177 // return a `&mut Node` of the newly-inserted node without |
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178 // yet another lookup. `BTreeMap::insert` doesn’t do this. |
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179 child_nodes.entry(ancestor_path.to_owned()).or_default() |
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180 }; |
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181 if let Some(next) = inclusive_ancestor_paths.next() { |
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182 ancestor_path = next; |
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183 child_nodes = &mut child_node.children; |
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184 } else { |
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185 return child_node; |
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186 } |
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187 } |
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188 } |
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189 |
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190 /// The meaning of `new_copy_source` is: |
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191 /// |
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192 /// * `Some(Some(x))`: set `Node::copy_source` to `Some(x)` |
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193 /// * `Some(None)`: set `Node::copy_source` to `None` |
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194 /// * `None`: leave `Node::copy_source` unchanged |
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195 fn add_file_node( |
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196 &mut self, |
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197 path: &HgPath, |
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198 new_entry: DirstateEntry, |
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199 new_copy_source: Option<Option<HgPathBuf>>, |
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200 ) { |
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201 let node = Self::get_or_insert_node(&mut self.root, path); |
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202 if node.entry.is_none() { |
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203 self.nodes_with_entry_count += 1 |
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204 } |
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205 if let Some(source) = &new_copy_source { |
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206 if node.copy_source.is_none() && source.is_some() { |
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207 self.nodes_with_copy_source_count += 1 |
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208 } |
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209 if node.copy_source.is_some() && source.is_none() { |
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210 self.nodes_with_copy_source_count -= 1 |
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211 } |
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212 } |
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213 let tracked_count_increment = |
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214 match (node.is_tracked_file(), new_entry.state.is_tracked()) { |
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215 (false, true) => 1, |
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216 (true, false) => -1, |
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217 _ => 0, |
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218 }; |
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219 |
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220 node.entry = Some(new_entry); |
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221 if let Some(source) = new_copy_source { |
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222 node.copy_source = source |
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223 } |
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224 // Borrow of `self.root` through `node` ends here |
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225 |
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226 match tracked_count_increment { |
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227 1 => self.for_each_ancestor_node(path, |node| { |
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228 node.tracked_descendants_count += 1 |
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229 }), |
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230 // We can’t use `+= -1` because the counter is unsigned |
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231 -1 => self.for_each_ancestor_node(path, |node| { |
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232 node.tracked_descendants_count -= 1 |
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233 }), |
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234 _ => {} |
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235 } |
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236 } |
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237 |
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238 fn iter_nodes<'a>( |
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239 &'a self, |
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240 ) -> impl Iterator<Item = (&'a WithBasename<HgPathBuf>, &'a Node)> + 'a |
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241 { |
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242 // Depth first tree traversal. |
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243 // |
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244 // If we could afford internal iteration and recursion, |
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245 // this would look like: |
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246 // |
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247 // ``` |
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248 // fn traverse_children( |
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249 // children: &ChildNodes, |
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250 // each: &mut impl FnMut(&Node), |
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251 // ) { |
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252 // for child in children.values() { |
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253 // traverse_children(&child.children, each); |
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254 // each(child); |
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255 // } |
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256 // } |
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257 // ``` |
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258 // |
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259 // However we want an external iterator and therefore can’t use the |
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260 // call stack. Use an explicit stack instead: |
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261 let mut stack = Vec::new(); |
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262 let mut iter = self.root.iter(); |
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263 std::iter::from_fn(move || { |
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264 while let Some((key, child_node)) = iter.next() { |
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265 // Pseudo-recursion |
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266 let new_iter = child_node.children.iter(); |
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267 let old_iter = std::mem::replace(&mut iter, new_iter); |
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268 stack.push((key, child_node, old_iter)); |
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269 } |
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270 // Found the end of a `children.iter()` iterator. |
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271 if let Some((key, child_node, next_iter)) = stack.pop() { |
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272 // "Return" from pseudo-recursion by restoring state from the |
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273 // explicit stack |
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274 iter = next_iter; |
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275 |
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276 Some((key, child_node)) |
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277 } else { |
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278 // Reached the bottom of the stack, we’re done |
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279 None |
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280 } |
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281 }) |
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282 } |
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283 |
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284 /// Mutable iterator for the `(entry, copy source)` of each node. |
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285 /// |
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286 /// It would not be safe to yield mutable references to nodes themeselves |
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287 /// with `-> impl Iterator<Item = &mut Node>` since child nodes are |
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288 /// reachable from their ancestor nodes, potentially creating multiple |
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289 /// `&mut` references to a given node. |
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290 fn iter_node_data_mut<'a>( |
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291 &'a mut self, |
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292 ) -> impl Iterator<Item = NodeDataMut<'a>> + 'a { |
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293 // Explict stack for pseudo-recursion, see `iter_nodes` above. |
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294 let mut stack = Vec::new(); |
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295 let mut iter = self.root.iter_mut(); |
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296 std::iter::from_fn(move || { |
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297 while let Some((key, child_node)) = iter.next() { |
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298 // Pseudo-recursion |
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299 let data = |
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300 (key, &mut child_node.entry, &mut child_node.copy_source); |
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301 let new_iter = child_node.children.iter_mut(); |
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302 let old_iter = std::mem::replace(&mut iter, new_iter); |
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303 stack.push((data, old_iter)); |
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304 } |
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305 // Found the end of a `children.values_mut()` iterator. |
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306 if let Some((data, next_iter)) = stack.pop() { |
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307 // "Return" from pseudo-recursion by restoring state from the |
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308 // explicit stack |
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309 iter = next_iter; |
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310 |
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311 Some(data) |
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312 } else { |
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313 // Reached the bottom of the stack, we’re done |
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314 None |
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315 } |
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316 }) |
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317 } |
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318 } |
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319 |
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320 impl super::dispatch::DirstateMapMethods for DirstateMap { |
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321 fn clear(&mut self) { |
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322 self.set_parents(&DirstateParents { |
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323 p1: NULL_NODE, |
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324 p2: NULL_NODE, |
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325 }); |
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326 self.root.clear(); |
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327 self.nodes_with_entry_count = 0; |
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328 self.nodes_with_copy_source_count = 0; |
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329 } |
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330 |
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331 fn add_file( |
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332 &mut self, |
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333 _filename: &HgPath, |
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334 _old_state: EntryState, |
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335 _entry: DirstateEntry, |
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336 ) -> Result<(), DirstateMapError> { |
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337 todo!() |
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338 } |
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339 |
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340 fn remove_file( |
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341 &mut self, |
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342 _filename: &HgPath, |
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343 _old_state: EntryState, |
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344 _size: i32, |
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345 ) -> Result<(), DirstateMapError> { |
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346 todo!() |
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347 } |
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348 |
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349 fn drop_file( |
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350 &mut self, |
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351 _filename: &HgPath, |
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352 _old_state: EntryState, |
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353 ) -> Result<bool, DirstateMapError> { |
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354 todo!() |
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355 } |
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356 |
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357 fn clear_ambiguous_times(&mut self, filenames: Vec<HgPathBuf>, now: i32) { |
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358 for filename in filenames { |
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359 if let Some(node) = Self::get_node_mut(&mut self.root, &filename) { |
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360 if let Some(entry) = node.entry.as_mut() { |
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361 clear_ambiguous_mtime(entry, now); |
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362 } |
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363 } |
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364 } |
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365 } |
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366 |
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367 fn non_normal_entries_contains(&mut self, _key: &HgPath) -> bool { |
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368 todo!() |
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369 } |
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370 |
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371 fn non_normal_entries_remove(&mut self, _key: &HgPath) -> bool { |
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372 todo!() |
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373 } |
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374 |
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375 fn non_normal_or_other_parent_paths( |
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376 &mut self, |
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377 ) -> Box<dyn Iterator<Item = &HgPathBuf> + '_> { |
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378 todo!() |
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379 } |
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380 |
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381 fn set_non_normal_other_parent_entries(&mut self, _force: bool) { |
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382 todo!() |
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383 } |
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384 |
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385 fn iter_non_normal_paths( |
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386 &mut self, |
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387 ) -> Box<dyn Iterator<Item = &HgPathBuf> + Send + '_> { |
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388 todo!() |
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389 } |
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390 |
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391 fn iter_non_normal_paths_panic( |
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392 &self, |
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393 ) -> Box<dyn Iterator<Item = &HgPathBuf> + Send + '_> { |
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394 todo!() |
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395 } |
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396 |
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397 fn iter_other_parent_paths( |
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398 &mut self, |
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399 ) -> Box<dyn Iterator<Item = &HgPathBuf> + Send + '_> { |
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400 todo!() |
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401 } |
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402 |
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403 fn has_tracked_dir( |
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404 &mut self, |
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405 directory: &HgPath, |
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406 ) -> Result<bool, DirstateMapError> { |
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407 if let Some(node) = self.get_node(directory) { |
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408 // A node without a `DirstateEntry` was created to hold child |
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409 // nodes, and is therefore a directory. |
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410 Ok(node.entry.is_none() && node.tracked_descendants_count > 0) |
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411 } else { |
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412 Ok(false) |
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413 } |
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414 } |
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415 |
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416 fn has_dir( |
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417 &mut self, |
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418 directory: &HgPath, |
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419 ) -> Result<bool, DirstateMapError> { |
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420 if let Some(node) = self.get_node(directory) { |
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421 // A node without a `DirstateEntry` was created to hold child |
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422 // nodes, and is therefore a directory. |
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423 Ok(node.entry.is_none()) |
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424 } else { |
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425 Ok(false) |
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426 } |
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427 } |
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428 |
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429 fn parents( |
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430 &mut self, |
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431 file_contents: &[u8], |
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432 ) -> Result<&DirstateParents, DirstateError> { |
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433 if self.parents.is_none() { |
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434 let parents = if !file_contents.is_empty() { |
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435 parse_dirstate_parents(file_contents)?.clone() |
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436 } else { |
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437 DirstateParents { |
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438 p1: NULL_NODE, |
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439 p2: NULL_NODE, |
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440 } |
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441 }; |
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442 self.parents = Some(parents); |
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443 } |
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444 Ok(self.parents.as_ref().unwrap()) |
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445 } |
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446 |
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447 fn set_parents(&mut self, parents: &DirstateParents) { |
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448 self.parents = Some(parents.clone()); |
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449 self.dirty_parents = true; |
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450 } |
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451 |
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452 fn read<'a>( |
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453 &mut self, |
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454 file_contents: &'a [u8], |
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455 ) -> Result<Option<&'a DirstateParents>, DirstateError> { |
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456 if file_contents.is_empty() { |
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457 return Ok(None); |
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458 } |
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459 |
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460 let parents = parse_dirstate_entries( |
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461 file_contents, |
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462 |path, entry, copy_source| { |
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463 self.add_file_node( |
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464 path, |
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465 *entry, |
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466 Some(copy_source.map(HgPath::to_owned)), |
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467 ) |
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468 }, |
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469 )?; |
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470 |
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471 if !self.dirty_parents { |
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472 self.set_parents(parents); |
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473 } |
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474 |
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475 Ok(Some(parents)) |
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476 } |
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477 |
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478 fn pack( |
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479 &mut self, |
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480 parents: DirstateParents, |
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481 now: Timestamp, |
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482 ) -> Result<Vec<u8>, DirstateError> { |
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483 // Optizimation (to be measured?): pre-compute size to avoid `Vec` |
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484 // reallocations |
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485 let mut size = parents.as_bytes().len(); |
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486 for (path, node) in self.iter_nodes() { |
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487 if node.entry.is_some() { |
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488 size += packed_entry_size( |
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489 path.full_path(), |
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490 node.copy_source.as_ref(), |
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491 ) |
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492 } |
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493 } |
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494 |
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495 let mut packed = Vec::with_capacity(size); |
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496 packed.extend(parents.as_bytes()); |
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497 |
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498 let now: i32 = now.0.try_into().expect("time overflow"); |
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499 for (path, opt_entry, copy_source) in self.iter_node_data_mut() { |
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500 if let Some(entry) = opt_entry { |
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501 clear_ambiguous_mtime(entry, now); |
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502 pack_entry( |
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503 path.full_path(), |
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504 entry, |
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505 copy_source.as_ref(), |
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506 &mut packed, |
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507 ); |
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508 } |
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509 } |
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510 self.dirty_parents = false; |
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511 Ok(packed) |
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512 } |
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513 |
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514 fn build_file_fold_map(&mut self) -> &FastHashMap<HgPathBuf, HgPathBuf> { |
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515 todo!() |
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516 } |
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517 |
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518 fn set_all_dirs(&mut self) -> Result<(), DirstateMapError> { |
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519 // Do nothing, this `DirstateMap` does not a separate `all_dirs` that |
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520 // needs to be recomputed |
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521 Ok(()) |
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522 } |
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523 |
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524 fn set_dirs(&mut self) -> Result<(), DirstateMapError> { |
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525 // Do nothing, this `DirstateMap` does not a separate `dirs` that needs |
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526 // to be recomputed |
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527 Ok(()) |
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528 } |
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529 |
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530 fn status<'a>( |
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531 &'a self, |
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532 _matcher: &'a (dyn Matcher + Sync), |
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533 _root_dir: PathBuf, |
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534 _ignore_files: Vec<PathBuf>, |
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535 _options: StatusOptions, |
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536 ) -> Result< |
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537 ( |
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538 (Vec<HgPathCow<'a>>, DirstateStatus<'a>), |
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539 Vec<PatternFileWarning>, |
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540 ), |
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541 StatusError, |
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542 > { |
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543 todo!() |
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544 } |
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545 |
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546 fn copy_map_len(&self) -> usize { |
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547 self.nodes_with_copy_source_count |
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548 } |
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549 |
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550 fn copy_map_iter(&self) -> CopyMapIter<'_> { |
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551 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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552 node.copy_source |
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553 .as_ref() |
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554 .map(|copy_source| (path.full_path(), copy_source)) |
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555 })) |
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556 } |
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557 |
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558 fn copy_map_contains_key(&self, key: &HgPath) -> bool { |
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559 if let Some(node) = self.get_node(key) { |
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560 node.copy_source.is_some() |
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561 } else { |
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562 false |
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563 } |
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564 } |
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565 |
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566 fn copy_map_get(&self, key: &HgPath) -> Option<&HgPathBuf> { |
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567 self.get_node(key)?.copy_source.as_ref() |
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568 } |
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569 |
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570 fn copy_map_remove(&mut self, key: &HgPath) -> Option<HgPathBuf> { |
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571 let count = &mut self.nodes_with_copy_source_count; |
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572 Self::get_node_mut(&mut self.root, key).and_then(|node| { |
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573 if node.copy_source.is_some() { |
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574 *count -= 1 |
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575 } |
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576 node.copy_source.take() |
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577 }) |
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578 } |
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579 |
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580 fn copy_map_insert( |
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581 &mut self, |
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582 key: HgPathBuf, |
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583 value: HgPathBuf, |
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584 ) -> Option<HgPathBuf> { |
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585 let node = Self::get_or_insert_node(&mut self.root, &key); |
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586 if node.copy_source.is_none() { |
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587 self.nodes_with_copy_source_count += 1 |
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588 } |
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589 node.copy_source.replace(value) |
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590 } |
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591 |
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592 fn len(&self) -> usize { |
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593 self.nodes_with_entry_count |
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594 } |
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595 |
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596 fn contains_key(&self, key: &HgPath) -> bool { |
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597 self.get(key).is_some() |
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598 } |
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599 |
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600 fn get(&self, key: &HgPath) -> Option<&DirstateEntry> { |
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601 self.get_node(key)?.entry.as_ref() |
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602 } |
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603 |
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604 fn iter(&self) -> StateMapIter<'_> { |
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605 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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606 node.entry.as_ref().map(|entry| (path.full_path(), entry)) |
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607 })) |
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608 } |
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609 } |