Mercurial > hg
annotate rust/hg-core/src/dirstate_tree/dirstate_map.rs @ 47103:214ae40e136b
dirstate-tree: Maintain a counter of DirstateEntry’s and copy sources
This allows implementing __len__ for DirstateMap and CopyMap efficiently,
without traversing the tree.
Differential Revision: https://phab.mercurial-scm.org/D10487
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Mon, 12 Apr 2021 17:29:55 +0200 |
parents | d6c94ca40863 |
children | fdf6cfa0e254 |
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 #[derive(Default)] |
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50 struct Node { |
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51 entry: Option<DirstateEntry>, |
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52 copy_source: Option<HgPathBuf>, |
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53 children: ChildNodes, |
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54 } |
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55 |
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56 /// `(full_path, entry, copy_source)` |
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57 type NodeDataMut<'a> = ( |
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58 &'a WithBasename<HgPathBuf>, |
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59 &'a mut Option<DirstateEntry>, |
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60 &'a mut Option<HgPathBuf>, |
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61 ); |
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62 |
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63 impl DirstateMap { |
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64 pub fn new() -> Self { |
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65 Self { |
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66 parents: None, |
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67 dirty_parents: false, |
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68 root: ChildNodes::new(), |
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69 nodes_with_entry_count: 0, |
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70 nodes_with_copy_source_count: 0, |
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71 } |
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72 } |
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73 |
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74 fn get_node(&self, path: &HgPath) -> Option<&Node> { |
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75 let mut children = &self.root; |
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76 let mut components = path.components(); |
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77 let mut component = |
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78 components.next().expect("expected at least one components"); |
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79 loop { |
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80 let child = children.get(component)?; |
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81 if let Some(next_component) = components.next() { |
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82 component = next_component; |
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83 children = &child.children; |
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84 } else { |
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85 return Some(child); |
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86 } |
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87 } |
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88 } |
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89 |
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90 /// This takes `root` instead of `&mut self` so that callers can mutate |
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91 /// other fields while the returned borrow is still valid |
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92 fn get_or_insert_node<'tree>( |
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93 root: &'tree mut ChildNodes, |
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94 path: &HgPath, |
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95 ) -> &'tree mut Node { |
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96 let mut child_nodes = root; |
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97 let mut inclusive_ancestor_paths = |
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98 WithBasename::inclusive_ancestors_of(path); |
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99 let mut ancestor_path = inclusive_ancestor_paths |
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100 .next() |
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101 .expect("expected at least one inclusive ancestor"); |
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102 loop { |
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103 // TODO: can we avoid double lookup in all cases without allocating |
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104 // an owned key in cases where the map already contains that key? |
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105 let child_node = |
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106 if child_nodes.contains_key(ancestor_path.base_name()) { |
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107 child_nodes.get_mut(ancestor_path.base_name()).unwrap() |
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108 } else { |
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109 // This is always a vacant entry, using `.entry()` lets us |
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110 // return a `&mut Node` of the newly-inserted node without |
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111 // yet another lookup. `BTreeMap::insert` doesn’t do this. |
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112 child_nodes.entry(ancestor_path.to_owned()).or_default() |
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113 }; |
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114 if let Some(next) = inclusive_ancestor_paths.next() { |
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115 ancestor_path = next; |
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116 child_nodes = &mut child_node.children; |
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117 } else { |
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118 return child_node; |
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119 } |
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120 } |
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121 } |
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122 |
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123 /// The meaning of `new_copy_source` is: |
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124 /// |
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125 /// * `Some(Some(x))`: set `Node::copy_source` to `Some(x)` |
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126 /// * `Some(None)`: set `Node::copy_source` to `None` |
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127 /// * `None`: leave `Node::copy_source` unchanged |
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128 fn add_file_node( |
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129 &mut self, |
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130 path: &HgPath, |
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131 new_entry: DirstateEntry, |
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132 new_copy_source: Option<Option<HgPathBuf>>, |
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133 ) { |
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134 let node = Self::get_or_insert_node(&mut self.root, path); |
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135 if node.entry.is_none() { |
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136 self.nodes_with_entry_count += 1 |
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137 } |
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138 if let Some(source) = &new_copy_source { |
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139 if node.copy_source.is_none() && source.is_some() { |
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140 self.nodes_with_copy_source_count += 1 |
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141 } |
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142 if node.copy_source.is_some() && source.is_none() { |
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143 self.nodes_with_copy_source_count -= 1 |
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144 } |
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145 } |
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146 node.entry = Some(new_entry); |
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147 if let Some(source) = new_copy_source { |
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148 node.copy_source = source |
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149 } |
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150 } |
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151 |
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152 fn iter_nodes<'a>( |
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153 &'a self, |
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154 ) -> impl Iterator<Item = (&'a WithBasename<HgPathBuf>, &'a Node)> + 'a |
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155 { |
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156 // Depth first tree traversal. |
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157 // |
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158 // If we could afford internal iteration and recursion, |
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159 // this would look like: |
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160 // |
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161 // ``` |
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162 // fn traverse_children( |
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163 // children: &ChildNodes, |
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164 // each: &mut impl FnMut(&Node), |
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165 // ) { |
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166 // for child in children.values() { |
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167 // traverse_children(&child.children, each); |
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168 // each(child); |
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169 // } |
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170 // } |
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171 // ``` |
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172 // |
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173 // However we want an external iterator and therefore can’t use the |
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174 // call stack. Use an explicit stack instead: |
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175 let mut stack = Vec::new(); |
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176 let mut iter = self.root.iter(); |
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177 std::iter::from_fn(move || { |
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178 while let Some((key, child_node)) = iter.next() { |
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179 // Pseudo-recursion |
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180 let new_iter = child_node.children.iter(); |
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181 let old_iter = std::mem::replace(&mut iter, new_iter); |
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182 stack.push((key, child_node, old_iter)); |
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183 } |
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184 // Found the end of a `children.iter()` iterator. |
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185 if let Some((key, child_node, next_iter)) = stack.pop() { |
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186 // "Return" from pseudo-recursion by restoring state from the |
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187 // explicit stack |
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188 iter = next_iter; |
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189 |
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190 Some((key, child_node)) |
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191 } else { |
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192 // Reached the bottom of the stack, we’re done |
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193 None |
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194 } |
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195 }) |
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196 } |
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197 |
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198 /// Mutable iterator for the `(entry, copy source)` of each node. |
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199 /// |
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200 /// It would not be safe to yield mutable references to nodes themeselves |
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201 /// with `-> impl Iterator<Item = &mut Node>` since child nodes are |
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202 /// reachable from their ancestor nodes, potentially creating multiple |
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203 /// `&mut` references to a given node. |
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204 fn iter_node_data_mut<'a>( |
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205 &'a mut self, |
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206 ) -> impl Iterator<Item = NodeDataMut<'a>> + 'a { |
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207 // Explict stack for pseudo-recursion, see `iter_nodes` above. |
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208 let mut stack = Vec::new(); |
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209 let mut iter = self.root.iter_mut(); |
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210 std::iter::from_fn(move || { |
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211 while let Some((key, child_node)) = iter.next() { |
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212 // Pseudo-recursion |
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213 let data = |
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214 (key, &mut child_node.entry, &mut child_node.copy_source); |
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215 let new_iter = child_node.children.iter_mut(); |
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216 let old_iter = std::mem::replace(&mut iter, new_iter); |
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217 stack.push((data, old_iter)); |
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218 } |
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219 // Found the end of a `children.values_mut()` iterator. |
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220 if let Some((data, next_iter)) = stack.pop() { |
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221 // "Return" from pseudo-recursion by restoring state from the |
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222 // explicit stack |
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223 iter = next_iter; |
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224 |
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225 Some(data) |
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226 } else { |
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227 // Reached the bottom of the stack, we’re done |
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228 None |
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229 } |
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230 }) |
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231 } |
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232 } |
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233 |
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234 impl super::dispatch::DirstateMapMethods for DirstateMap { |
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235 fn clear(&mut self) { |
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236 self.set_parents(&DirstateParents { |
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237 p1: NULL_NODE, |
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238 p2: NULL_NODE, |
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239 }); |
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240 self.root.clear(); |
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241 self.nodes_with_entry_count = 0; |
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242 self.nodes_with_copy_source_count = 0; |
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243 } |
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244 |
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245 fn add_file( |
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246 &mut self, |
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247 _filename: &HgPath, |
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248 _old_state: EntryState, |
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249 _entry: DirstateEntry, |
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250 ) -> Result<(), DirstateMapError> { |
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251 todo!() |
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252 } |
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253 |
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254 fn remove_file( |
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255 &mut self, |
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256 _filename: &HgPath, |
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257 _old_state: EntryState, |
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258 _size: i32, |
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259 ) -> Result<(), DirstateMapError> { |
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260 todo!() |
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261 } |
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262 |
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263 fn drop_file( |
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264 &mut self, |
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265 _filename: &HgPath, |
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266 _old_state: EntryState, |
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267 ) -> Result<bool, DirstateMapError> { |
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268 todo!() |
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269 } |
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270 |
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271 fn clear_ambiguous_times( |
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272 &mut self, |
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273 _filenames: Vec<HgPathBuf>, |
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274 _now: i32, |
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275 ) { |
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276 todo!() |
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277 } |
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278 |
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279 fn non_normal_entries_contains(&mut self, _key: &HgPath) -> bool { |
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280 todo!() |
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281 } |
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282 |
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283 fn non_normal_entries_remove(&mut self, _key: &HgPath) -> bool { |
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284 todo!() |
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285 } |
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286 |
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287 fn non_normal_or_other_parent_paths( |
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288 &mut self, |
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289 ) -> Box<dyn Iterator<Item = &HgPathBuf> + '_> { |
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290 todo!() |
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291 } |
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292 |
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293 fn set_non_normal_other_parent_entries(&mut self, _force: bool) { |
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294 todo!() |
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295 } |
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296 |
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297 fn iter_non_normal_paths( |
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298 &mut self, |
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299 ) -> Box<dyn Iterator<Item = &HgPathBuf> + Send + '_> { |
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300 todo!() |
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301 } |
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302 |
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303 fn iter_non_normal_paths_panic( |
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304 &self, |
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305 ) -> Box<dyn Iterator<Item = &HgPathBuf> + Send + '_> { |
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306 todo!() |
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307 } |
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308 |
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309 fn iter_other_parent_paths( |
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310 &mut self, |
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311 ) -> Box<dyn Iterator<Item = &HgPathBuf> + Send + '_> { |
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312 todo!() |
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313 } |
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314 |
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315 fn has_tracked_dir( |
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316 &mut self, |
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317 _directory: &HgPath, |
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318 ) -> Result<bool, DirstateMapError> { |
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319 todo!() |
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320 } |
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321 |
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322 fn has_dir( |
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323 &mut self, |
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324 _directory: &HgPath, |
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325 ) -> Result<bool, DirstateMapError> { |
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326 todo!() |
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327 } |
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328 |
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329 fn parents( |
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330 &mut self, |
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331 file_contents: &[u8], |
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332 ) -> Result<&DirstateParents, DirstateError> { |
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333 if self.parents.is_none() { |
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334 let parents = if !file_contents.is_empty() { |
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335 parse_dirstate_parents(file_contents)?.clone() |
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336 } else { |
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337 DirstateParents { |
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338 p1: NULL_NODE, |
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339 p2: NULL_NODE, |
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340 } |
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341 }; |
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342 self.parents = Some(parents); |
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343 } |
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344 Ok(self.parents.as_ref().unwrap()) |
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345 } |
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346 |
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347 fn set_parents(&mut self, parents: &DirstateParents) { |
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348 self.parents = Some(parents.clone()); |
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349 self.dirty_parents = true; |
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350 } |
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351 |
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352 fn read<'a>( |
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353 &mut self, |
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354 file_contents: &'a [u8], |
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355 ) -> Result<Option<&'a DirstateParents>, DirstateError> { |
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356 if file_contents.is_empty() { |
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357 return Ok(None); |
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358 } |
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359 |
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360 let parents = parse_dirstate_entries( |
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361 file_contents, |
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362 |path, entry, copy_source| { |
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363 self.add_file_node( |
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364 path, |
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365 *entry, |
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366 Some(copy_source.map(HgPath::to_owned)), |
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367 ) |
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368 }, |
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369 )?; |
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370 |
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371 if !self.dirty_parents { |
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372 self.set_parents(parents); |
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373 } |
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374 |
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375 Ok(Some(parents)) |
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376 } |
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377 |
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378 fn pack( |
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379 &mut self, |
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380 parents: DirstateParents, |
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381 now: Timestamp, |
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382 ) -> Result<Vec<u8>, DirstateError> { |
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383 // Optizimation (to be measured?): pre-compute size to avoid `Vec` |
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384 // reallocations |
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385 let mut size = parents.as_bytes().len(); |
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386 for (path, node) in self.iter_nodes() { |
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387 if node.entry.is_some() { |
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388 size += packed_entry_size( |
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389 path.full_path(), |
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390 node.copy_source.as_ref(), |
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391 ) |
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392 } |
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393 } |
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394 |
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395 let mut packed = Vec::with_capacity(size); |
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396 packed.extend(parents.as_bytes()); |
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397 |
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398 let now: i32 = now.0.try_into().expect("time overflow"); |
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399 for (path, opt_entry, copy_source) in self.iter_node_data_mut() { |
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400 if let Some(entry) = opt_entry { |
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401 clear_ambiguous_mtime(entry, now); |
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402 pack_entry( |
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403 path.full_path(), |
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404 entry, |
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405 copy_source.as_ref(), |
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406 &mut packed, |
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407 ); |
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408 } |
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409 } |
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410 self.dirty_parents = false; |
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411 Ok(packed) |
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412 } |
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413 |
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414 fn build_file_fold_map(&mut self) -> &FastHashMap<HgPathBuf, HgPathBuf> { |
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415 todo!() |
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416 } |
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417 |
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418 fn set_all_dirs(&mut self) -> Result<(), DirstateMapError> { |
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419 todo!() |
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420 } |
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421 |
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422 fn set_dirs(&mut self) -> Result<(), DirstateMapError> { |
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423 todo!() |
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424 } |
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425 |
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426 fn status<'a>( |
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427 &'a self, |
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428 _matcher: &'a (dyn Matcher + Sync), |
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429 _root_dir: PathBuf, |
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430 _ignore_files: Vec<PathBuf>, |
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431 _options: StatusOptions, |
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432 ) -> Result< |
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433 ( |
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434 (Vec<HgPathCow<'a>>, DirstateStatus<'a>), |
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435 Vec<PatternFileWarning>, |
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436 ), |
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437 StatusError, |
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438 > { |
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439 todo!() |
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440 } |
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441 |
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442 fn copy_map_len(&self) -> usize { |
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443 self.nodes_with_copy_source_count |
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444 } |
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445 |
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446 fn copy_map_iter(&self) -> CopyMapIter<'_> { |
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447 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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448 node.copy_source |
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449 .as_ref() |
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450 .map(|copy_source| (path.full_path(), copy_source)) |
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451 })) |
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452 } |
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453 |
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454 fn copy_map_contains_key(&self, key: &HgPath) -> bool { |
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455 if let Some(node) = self.get_node(key) { |
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456 node.copy_source.is_some() |
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457 } else { |
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458 false |
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459 } |
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460 } |
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461 |
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462 fn copy_map_get(&self, key: &HgPath) -> Option<&HgPathBuf> { |
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463 self.get_node(key)?.copy_source.as_ref() |
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464 } |
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465 |
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466 fn copy_map_remove(&mut self, _key: &HgPath) -> Option<HgPathBuf> { |
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467 todo!() |
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468 } |
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469 |
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470 fn copy_map_insert( |
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471 &mut self, |
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472 _key: HgPathBuf, |
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473 _value: HgPathBuf, |
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474 ) -> Option<HgPathBuf> { |
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475 todo!() |
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476 } |
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477 |
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478 fn len(&self) -> usize { |
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479 self.nodes_with_entry_count |
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480 } |
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481 |
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482 fn contains_key(&self, key: &HgPath) -> bool { |
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483 self.get(key).is_some() |
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484 } |
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485 |
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486 fn get(&self, key: &HgPath) -> Option<&DirstateEntry> { |
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487 self.get_node(key)?.entry.as_ref() |
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488 } |
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489 |
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490 fn iter(&self) -> StateMapIter<'_> { |
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491 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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492 node.entry.as_ref().map(|entry| (path.full_path(), entry)) |
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493 })) |
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494 } |
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495 } |