Mercurial > hg
annotate rust/hg-core/src/dirstate_tree/dirstate_map.rs @ 47101:5d62243c7732
rust: Add a Timestamp struct instead of abusing Duration
`SystemTime` would be the standard library type semantically appropriate
instead of `Duration`.
But since the value is coming from Python as a plain integer and used in
dirstate packing code as an integer, let’s make a type that contains a single
integer instead of using one with sub-second precision.
Differential Revision: https://phab.mercurial-scm.org/D10485
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Mon, 12 Apr 2021 14:43:45 +0200 |
parents | caa3031c9ed5 |
children | d6c94ca40863 |
rev | line source |
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1 use std::collections::BTreeMap; |
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2 use std::path::PathBuf; |
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3 |
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4 use super::path_with_basename::WithBasename; |
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5 use crate::dirstate::parsers::parse_dirstate_entries; |
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6 use crate::dirstate::parsers::parse_dirstate_parents; |
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7 use crate::dirstate::parsers::Timestamp; |
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8 |
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9 use crate::matchers::Matcher; |
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10 use crate::revlog::node::NULL_NODE; |
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11 use crate::utils::hg_path::{HgPath, HgPathBuf}; |
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12 use crate::CopyMapIter; |
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13 use crate::DirstateEntry; |
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14 use crate::DirstateError; |
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15 use crate::DirstateMapError; |
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16 use crate::DirstateParents; |
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17 use crate::DirstateStatus; |
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18 use crate::EntryState; |
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19 use crate::FastHashMap; |
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20 use crate::HgPathCow; |
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21 use crate::PatternFileWarning; |
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22 use crate::StateMapIter; |
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23 use crate::StatusError; |
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24 use crate::StatusOptions; |
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25 |
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26 pub struct DirstateMap { |
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27 parents: Option<DirstateParents>, |
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28 dirty_parents: bool, |
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29 root: ChildNodes, |
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30 } |
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31 |
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32 /// Using a plain `HgPathBuf` of the full path from the repository root as a |
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33 /// map key would also work: all paths in a given map have the same parent |
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34 /// path, so comparing full paths gives the same result as comparing base |
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35 /// names. However `BTreeMap` would waste time always re-comparing the same |
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36 /// string prefix. |
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37 type ChildNodes = BTreeMap<WithBasename<HgPathBuf>, Node>; |
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38 |
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39 #[derive(Default)] |
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40 struct Node { |
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41 entry: Option<DirstateEntry>, |
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42 copy_source: Option<HgPathBuf>, |
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43 children: ChildNodes, |
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44 } |
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45 |
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46 /// `(full_path, entry, copy_source)` |
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47 type NodeDataMut<'a> = ( |
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48 &'a WithBasename<HgPathBuf>, |
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49 &'a mut Option<DirstateEntry>, |
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50 &'a mut Option<HgPathBuf>, |
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51 ); |
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52 |
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53 impl DirstateMap { |
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54 pub fn new() -> Self { |
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55 Self { |
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56 parents: None, |
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57 dirty_parents: false, |
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58 root: ChildNodes::new(), |
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59 } |
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60 } |
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61 |
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62 fn get_node(&self, path: &HgPath) -> Option<&Node> { |
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63 let mut children = &self.root; |
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64 let mut components = path.components(); |
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65 let mut component = |
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66 components.next().expect("expected at least one components"); |
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67 loop { |
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68 let child = children.get(component)?; |
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69 if let Some(next_component) = components.next() { |
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70 component = next_component; |
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71 children = &child.children; |
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72 } else { |
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73 return Some(child); |
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74 } |
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75 } |
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76 } |
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77 |
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78 fn get_or_insert_node(&mut self, path: &HgPath) -> &mut Node { |
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79 let mut child_nodes = &mut self.root; |
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80 let mut inclusive_ancestor_paths = |
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81 WithBasename::inclusive_ancestors_of(path); |
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82 let mut ancestor_path = inclusive_ancestor_paths |
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83 .next() |
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84 .expect("expected at least one inclusive ancestor"); |
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85 loop { |
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86 // TODO: can we avoid double lookup in all cases without allocating |
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87 // an owned key in cases where the map already contains that key? |
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88 let child_node = |
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89 if child_nodes.contains_key(ancestor_path.base_name()) { |
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90 child_nodes.get_mut(ancestor_path.base_name()).unwrap() |
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91 } else { |
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92 // This is always a vacant entry, using `.entry()` lets us |
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93 // return a `&mut Node` of the newly-inserted node without |
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94 // yet another lookup. `BTreeMap::insert` doesn’t do this. |
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95 child_nodes.entry(ancestor_path.to_owned()).or_default() |
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96 }; |
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97 if let Some(next) = inclusive_ancestor_paths.next() { |
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98 ancestor_path = next; |
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99 child_nodes = &mut child_node.children; |
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100 } else { |
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101 return child_node; |
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102 } |
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103 } |
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104 } |
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105 |
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106 fn iter_nodes<'a>( |
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107 &'a self, |
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108 ) -> impl Iterator<Item = (&'a WithBasename<HgPathBuf>, &'a Node)> + 'a |
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109 { |
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110 // Depth first tree traversal. |
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111 // |
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112 // If we could afford internal iteration and recursion, |
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113 // this would look like: |
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114 // |
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115 // ``` |
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116 // fn traverse_children( |
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117 // children: &ChildNodes, |
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118 // each: &mut impl FnMut(&Node), |
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119 // ) { |
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120 // for child in children.values() { |
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121 // traverse_children(&child.children, each); |
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122 // each(child); |
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123 // } |
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124 // } |
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125 // ``` |
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126 // |
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127 // However we want an external iterator and therefore can’t use the |
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128 // call stack. Use an explicit stack instead: |
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129 let mut stack = Vec::new(); |
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130 let mut iter = self.root.iter(); |
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131 std::iter::from_fn(move || { |
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132 while let Some((key, child_node)) = iter.next() { |
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133 // Pseudo-recursion |
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134 let new_iter = child_node.children.iter(); |
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135 let old_iter = std::mem::replace(&mut iter, new_iter); |
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136 stack.push((key, child_node, old_iter)); |
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137 } |
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138 // Found the end of a `children.iter()` iterator. |
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139 if let Some((key, child_node, next_iter)) = stack.pop() { |
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140 // "Return" from pseudo-recursion by restoring state from the |
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141 // explicit stack |
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142 iter = next_iter; |
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143 |
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144 Some((key, child_node)) |
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145 } else { |
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146 // Reached the bottom of the stack, we’re done |
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147 None |
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148 } |
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149 }) |
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150 } |
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151 |
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152 /// Mutable iterator for the `(entry, copy source)` of each node. |
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153 /// |
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154 /// It would not be safe to yield mutable references to nodes themeselves |
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155 /// with `-> impl Iterator<Item = &mut Node>` since child nodes are |
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156 /// reachable from their ancestor nodes, potentially creating multiple |
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157 /// `&mut` references to a given node. |
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158 fn iter_node_data_mut<'a>( |
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159 &'a mut self, |
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160 ) -> impl Iterator<Item = NodeDataMut<'a>> + 'a { |
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161 // Explict stack for pseudo-recursion, see `iter_nodes` above. |
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162 let mut stack = Vec::new(); |
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163 let mut iter = self.root.iter_mut(); |
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164 std::iter::from_fn(move || { |
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165 while let Some((key, child_node)) = iter.next() { |
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166 // Pseudo-recursion |
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167 let data = |
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168 (key, &mut child_node.entry, &mut child_node.copy_source); |
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169 let new_iter = child_node.children.iter_mut(); |
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170 let old_iter = std::mem::replace(&mut iter, new_iter); |
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171 stack.push((data, old_iter)); |
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172 } |
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173 // Found the end of a `children.values_mut()` iterator. |
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174 if let Some((data, next_iter)) = stack.pop() { |
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175 // "Return" from pseudo-recursion by restoring state from the |
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176 // explicit stack |
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177 iter = next_iter; |
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178 |
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179 Some(data) |
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180 } else { |
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181 // Reached the bottom of the stack, we’re done |
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182 None |
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183 } |
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184 }) |
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185 } |
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186 } |
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187 |
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188 impl super::dispatch::DirstateMapMethods for DirstateMap { |
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189 fn clear(&mut self) { |
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190 self.set_parents(&DirstateParents { |
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191 p1: NULL_NODE, |
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192 p2: NULL_NODE, |
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193 }); |
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194 self.root.clear() |
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195 } |
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196 |
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197 fn add_file( |
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198 &mut self, |
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199 _filename: &HgPath, |
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200 _old_state: EntryState, |
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201 _entry: DirstateEntry, |
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202 ) -> Result<(), DirstateMapError> { |
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203 todo!() |
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204 } |
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205 |
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206 fn remove_file( |
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207 &mut self, |
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208 _filename: &HgPath, |
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209 _old_state: EntryState, |
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210 _size: i32, |
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211 ) -> Result<(), DirstateMapError> { |
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212 todo!() |
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213 } |
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214 |
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215 fn drop_file( |
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216 &mut self, |
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217 _filename: &HgPath, |
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218 _old_state: EntryState, |
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219 ) -> Result<bool, DirstateMapError> { |
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220 todo!() |
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221 } |
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222 |
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223 fn clear_ambiguous_times( |
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224 &mut self, |
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225 _filenames: Vec<HgPathBuf>, |
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226 _now: i32, |
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227 ) { |
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228 todo!() |
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229 } |
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230 |
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231 fn non_normal_entries_contains(&mut self, _key: &HgPath) -> bool { |
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232 todo!() |
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233 } |
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234 |
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235 fn non_normal_entries_remove(&mut self, _key: &HgPath) -> bool { |
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236 todo!() |
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237 } |
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238 |
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239 fn non_normal_or_other_parent_paths( |
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240 &mut self, |
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241 ) -> Box<dyn Iterator<Item = &HgPathBuf> + '_> { |
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242 todo!() |
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243 } |
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244 |
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245 fn set_non_normal_other_parent_entries(&mut self, _force: bool) { |
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246 todo!() |
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247 } |
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248 |
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249 fn iter_non_normal_paths( |
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250 &mut self, |
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251 ) -> Box<dyn Iterator<Item = &HgPathBuf> + Send + '_> { |
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252 todo!() |
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253 } |
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254 |
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255 fn iter_non_normal_paths_panic( |
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256 &self, |
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257 ) -> Box<dyn Iterator<Item = &HgPathBuf> + Send + '_> { |
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258 todo!() |
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259 } |
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260 |
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261 fn iter_other_parent_paths( |
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262 &mut self, |
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263 ) -> Box<dyn Iterator<Item = &HgPathBuf> + Send + '_> { |
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264 todo!() |
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265 } |
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266 |
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267 fn has_tracked_dir( |
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268 &mut self, |
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269 _directory: &HgPath, |
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270 ) -> Result<bool, DirstateMapError> { |
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271 todo!() |
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272 } |
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273 |
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274 fn has_dir( |
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275 &mut self, |
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276 _directory: &HgPath, |
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277 ) -> Result<bool, DirstateMapError> { |
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278 todo!() |
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279 } |
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280 |
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281 fn parents( |
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282 &mut self, |
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283 file_contents: &[u8], |
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284 ) -> Result<&DirstateParents, DirstateError> { |
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285 if self.parents.is_none() { |
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286 let parents = if !file_contents.is_empty() { |
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287 parse_dirstate_parents(file_contents)?.clone() |
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288 } else { |
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289 DirstateParents { |
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290 p1: NULL_NODE, |
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291 p2: NULL_NODE, |
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292 } |
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293 }; |
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294 self.parents = Some(parents); |
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295 } |
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296 Ok(self.parents.as_ref().unwrap()) |
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297 } |
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298 |
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299 fn set_parents(&mut self, parents: &DirstateParents) { |
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300 self.parents = Some(parents.clone()); |
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301 self.dirty_parents = true; |
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302 } |
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303 |
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304 fn read<'a>( |
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305 &mut self, |
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306 file_contents: &'a [u8], |
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307 ) -> Result<Option<&'a DirstateParents>, DirstateError> { |
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308 if file_contents.is_empty() { |
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309 return Ok(None); |
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310 } |
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311 |
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312 let parents = parse_dirstate_entries( |
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313 file_contents, |
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314 |path, entry, copy_source| { |
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315 let node = self.get_or_insert_node(path); |
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316 node.entry = Some(*entry); |
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317 node.copy_source = copy_source.map(HgPath::to_owned); |
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318 }, |
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319 )?; |
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320 |
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321 if !self.dirty_parents { |
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322 self.set_parents(parents); |
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323 } |
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324 |
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325 Ok(Some(parents)) |
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326 } |
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327 |
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328 fn pack( |
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329 &mut self, |
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330 _parents: DirstateParents, |
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331 _now: Timestamp, |
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332 ) -> Result<Vec<u8>, DirstateError> { |
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333 let _ = self.iter_node_data_mut(); |
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334 todo!() |
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335 } |
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336 |
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337 fn build_file_fold_map(&mut self) -> &FastHashMap<HgPathBuf, HgPathBuf> { |
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338 todo!() |
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339 } |
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340 |
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341 fn set_all_dirs(&mut self) -> Result<(), DirstateMapError> { |
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342 todo!() |
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343 } |
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344 |
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345 fn set_dirs(&mut self) -> Result<(), DirstateMapError> { |
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346 todo!() |
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347 } |
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348 |
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349 fn status<'a>( |
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350 &'a self, |
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351 _matcher: &'a (dyn Matcher + Sync), |
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352 _root_dir: PathBuf, |
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353 _ignore_files: Vec<PathBuf>, |
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354 _options: StatusOptions, |
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355 ) -> Result< |
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356 ( |
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357 (Vec<HgPathCow<'a>>, DirstateStatus<'a>), |
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358 Vec<PatternFileWarning>, |
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359 ), |
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360 StatusError, |
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361 > { |
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362 todo!() |
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363 } |
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364 |
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365 fn copy_map_len(&self) -> usize { |
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366 todo!() |
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367 } |
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368 |
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369 fn copy_map_iter(&self) -> CopyMapIter<'_> { |
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370 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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371 node.copy_source |
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372 .as_ref() |
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373 .map(|copy_source| (path.full_path(), copy_source)) |
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374 })) |
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375 } |
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376 |
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377 fn copy_map_contains_key(&self, key: &HgPath) -> bool { |
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378 if let Some(node) = self.get_node(key) { |
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379 node.copy_source.is_some() |
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380 } else { |
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381 false |
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382 } |
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383 } |
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384 |
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385 fn copy_map_get(&self, key: &HgPath) -> Option<&HgPathBuf> { |
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386 self.get_node(key)?.copy_source.as_ref() |
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387 } |
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388 |
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389 fn copy_map_remove(&mut self, _key: &HgPath) -> Option<HgPathBuf> { |
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390 todo!() |
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391 } |
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392 |
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393 fn copy_map_insert( |
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394 &mut self, |
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395 _key: HgPathBuf, |
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396 _value: HgPathBuf, |
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397 ) -> Option<HgPathBuf> { |
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398 todo!() |
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399 } |
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400 |
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401 fn len(&self) -> usize { |
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402 todo!() |
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403 } |
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404 |
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405 fn contains_key(&self, key: &HgPath) -> bool { |
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406 self.get(key).is_some() |
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407 } |
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408 |
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409 fn get(&self, key: &HgPath) -> Option<&DirstateEntry> { |
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410 self.get_node(key)?.entry.as_ref() |
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411 } |
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412 |
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413 fn iter(&self) -> StateMapIter<'_> { |
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414 Box::new(self.iter_nodes().filter_map(|(path, node)| { |
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415 node.entry.as_ref().map(|entry| (path.full_path(), entry)) |
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416 })) |
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417 } |
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418 } |