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annotate rust/hg-cpython/src/revlog.rs @ 44508:b581231ae9d1

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rust-nodemap: add binding for `nodemap_data_all` Differential Revision: https://phab.mercurial-scm.org/D8158
author Georges Racinet <georges.racinet@octobus.net>
date Wed, 12 Feb 2020 10:51:17 +0100
parents 857cc79247ac
children 5bbf887275b0
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1 // revlog.rs
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2 //
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3 // Copyright 2019-2020 Georges Racinet <georges.racinet@octobus.net>
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4 //
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5 // This software may be used and distributed according to the terms of the
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6 // GNU General Public License version 2 or any later version.
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7
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8 use crate::{
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9 cindex,
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10 utils::{node_from_py_bytes, node_from_py_object},
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11 };
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12 use cpython::{
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13 exc::{IndexError, ValueError},
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14 ObjectProtocol, PyBytes, PyClone, PyDict, PyErr, PyModule, PyObject,
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15 PyResult, PyString, PyTuple, Python, PythonObject, ToPyObject,
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16 };
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17 use hg::{
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18 nodemap::{NodeMapError, NodeTree},
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19 revlog::{nodemap::NodeMap, RevlogIndex},
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20 NodeError, Revision,
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21 };
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22 use std::cell::RefCell;
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23
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24 /// Return a Struct implementing the Graph trait
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25 pub(crate) fn pyindex_to_graph(
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26 py: Python,
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27 index: PyObject,
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28 ) -> PyResult<cindex::Index> {
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29 match index.extract::<MixedIndex>(py) {
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30 Ok(midx) => Ok(midx.clone_cindex(py)),
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31 Err(_) => cindex::Index::new(py, index),
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32 }
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33 }
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34
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35 py_class!(pub class MixedIndex |py| {
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36 data cindex: RefCell<cindex::Index>;
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37 data nt: RefCell<Option<NodeTree>>;
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38
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39 def __new__(_cls, cindex: PyObject) -> PyResult<MixedIndex> {
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40 Self::new(py, cindex)
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41 }
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42
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43 /// Compatibility layer used for Python consumers needing access to the C index
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44 ///
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45 /// Only use case so far is `scmutil.shortesthexnodeidprefix`,
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46 /// that may need to build a custom `nodetree`, based on a specified revset.
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47 /// With a Rust implementation of the nodemap, we will be able to get rid of
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48 /// this, by exposing our own standalone nodemap class,
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49 /// ready to accept `MixedIndex`.
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50 def get_cindex(&self) -> PyResult<PyObject> {
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51 Ok(self.cindex(py).borrow().inner().clone_ref(py))
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52 }
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53
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54 // Index API involving nodemap, as defined in mercurial/pure/parsers.py
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55
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56 /// Return Revision if found, raises a bare `error.RevlogError`
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57 /// in case of ambiguity, same as C version does
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58 def get_rev(&self, node: PyBytes) -> PyResult<Option<Revision>> {
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59 let opt = self.get_nodetree(py)?.borrow();
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60 let nt = opt.as_ref().unwrap();
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61 let idx = &*self.cindex(py).borrow();
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62 let node = node_from_py_bytes(py, &node)?;
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63 nt.find_bin(idx, (&node).into()).map_err(|e| nodemap_error(py, e))
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64 }
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65
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66 /// same as `get_rev()` but raises a bare `error.RevlogError` if node
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67 /// is not found.
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68 ///
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69 /// No need to repeat `node` in the exception, `mercurial/revlog.py`
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70 /// will catch and rewrap with it
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71 def rev(&self, node: PyBytes) -> PyResult<Revision> {
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72 self.get_rev(py, node)?.ok_or_else(|| revlog_error(py))
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73 }
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74
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75 /// return True if the node exist in the index
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76 def has_node(&self, node: PyBytes) -> PyResult<bool> {
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77 self.get_rev(py, node).map(|opt| opt.is_some())
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78 }
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79
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80 /// find length of shortest hex nodeid of a binary ID
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81 def shortest(&self, node: PyBytes) -> PyResult<usize> {
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82 let opt = self.get_nodetree(py)?.borrow();
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83 let nt = opt.as_ref().unwrap();
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84 let idx = &*self.cindex(py).borrow();
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85 match nt.unique_prefix_len_node(idx, &node_from_py_bytes(py, &node)?)
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86 {
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87 Ok(Some(l)) => Ok(l),
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88 Ok(None) => Err(revlog_error(py)),
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89 Err(e) => Err(nodemap_error(py, e)),
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90 }
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91 }
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92
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93 def partialmatch(&self, node: PyObject) -> PyResult<Option<PyBytes>> {
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94 let opt = self.get_nodetree(py)?.borrow();
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95 let nt = opt.as_ref().unwrap();
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96 let idx = &*self.cindex(py).borrow();
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97
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98 let node_as_string = if cfg!(feature = "python3-sys") {
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99 node.cast_as::<PyString>(py)?.to_string(py)?.to_string()
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100 }
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101 else {
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102 let node = node.extract::<PyBytes>(py)?;
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103 String::from_utf8_lossy(node.data(py)).to_string()
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104 };
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105
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106 nt.find_hex(idx, &node_as_string)
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107 // TODO make an inner API returning the node directly
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108 .map(|opt| opt.map(
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109 |rev| PyBytes::new(py, idx.node(rev).unwrap().as_bytes())))
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110 .map_err(|e| nodemap_error(py, e))
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111
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112 }
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113
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114 /// append an index entry
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115 def append(&self, tup: PyTuple) -> PyResult<PyObject> {
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116 if tup.len(py) < 8 {
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117 // this is better than the panic promised by tup.get_item()
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118 return Err(
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119 PyErr::new::<IndexError, _>(py, "tuple index out of range"))
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120 }
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121 let node_bytes = tup.get_item(py, 7).extract(py)?;
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122 let node = node_from_py_object(py, &node_bytes)?;
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123
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124 let mut idx = self.cindex(py).borrow_mut();
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125 let rev = idx.len() as Revision;
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126
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127 idx.append(py, tup)?;
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128 self.get_nodetree(py)?.borrow_mut().as_mut().unwrap()
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129 .insert(&*idx, &node, rev)
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130 .map_err(|e| nodemap_error(py, e))?;
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131 Ok(py.None())
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132 }
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133
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134 def __delitem__(&self, key: PyObject) -> PyResult<()> {
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135 // __delitem__ is both for `del idx[r]` and `del idx[r1:r2]`
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136 self.cindex(py).borrow().inner().del_item(py, key)?;
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137 let mut opt = self.get_nodetree(py)?.borrow_mut();
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138 let mut nt = opt.as_mut().unwrap();
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139 nt.invalidate_all();
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140 self.fill_nodemap(py, &mut nt)?;
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141 Ok(())
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142 }
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143
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144 //
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145 // Reforwarded C index API
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146 //
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147
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148 // index_methods (tp_methods). Same ordering as in revlog.c
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149
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150 /// return the gca set of the given revs
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151 def ancestors(&self, *args, **kw) -> PyResult<PyObject> {
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152 self.call_cindex(py, "ancestors", args, kw)
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153 }
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154
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155 /// return the heads of the common ancestors of the given revs
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156 def commonancestorsheads(&self, *args, **kw) -> PyResult<PyObject> {
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157 self.call_cindex(py, "commonancestorsheads", args, kw)
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158 }
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159
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160 /// clear the index caches
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161 def clearcaches(&self, *args, **kw) -> PyResult<PyObject> {
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162 self.call_cindex(py, "clearcaches", args, kw)
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163 }
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164
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165 /// get an index entry
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166 def get(&self, *args, **kw) -> PyResult<PyObject> {
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167 self.call_cindex(py, "get", args, kw)
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168 }
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169
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170 /// compute phases
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171 def computephasesmapsets(&self, *args, **kw) -> PyResult<PyObject> {
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172 self.call_cindex(py, "computephasesmapsets", args, kw)
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173 }
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174
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175 /// reachableroots
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176 def reachableroots2(&self, *args, **kw) -> PyResult<PyObject> {
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177 self.call_cindex(py, "reachableroots2", args, kw)
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178 }
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179
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180 /// get head revisions
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181 def headrevs(&self, *args, **kw) -> PyResult<PyObject> {
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182 self.call_cindex(py, "headrevs", args, kw)
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183 }
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184
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185 /// get filtered head revisions
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186 def headrevsfiltered(&self, *args, **kw) -> PyResult<PyObject> {
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187 self.call_cindex(py, "headrevsfiltered", args, kw)
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188 }
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189
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190 /// True if the object is a snapshot
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191 def issnapshot(&self, *args, **kw) -> PyResult<PyObject> {
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192 self.call_cindex(py, "issnapshot", args, kw)
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193 }
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194
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195 /// Gather snapshot data in a cache dict
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196 def findsnapshots(&self, *args, **kw) -> PyResult<PyObject> {
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197 self.call_cindex(py, "findsnapshots", args, kw)
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198 }
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199
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200 /// determine revisions with deltas to reconstruct fulltext
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201 def deltachain(&self, *args, **kw) -> PyResult<PyObject> {
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202 self.call_cindex(py, "deltachain", args, kw)
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203 }
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204
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205 /// slice planned chunk read to reach a density threshold
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206 def slicechunktodensity(&self, *args, **kw) -> PyResult<PyObject> {
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207 self.call_cindex(py, "slicechunktodensity", args, kw)
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208 }
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209
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210 /// stats for the index
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211 def stats(&self, *args, **kw) -> PyResult<PyObject> {
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212 self.call_cindex(py, "stats", args, kw)
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213 }
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214
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215 // index_sequence_methods and index_mapping_methods.
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216 //
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217 // Since we call back through the high level Python API,
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218 // there's no point making a distinction between index_get
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219 // and index_getitem.
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220
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221 def __len__(&self) -> PyResult<usize> {
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222 self.cindex(py).borrow().inner().len(py)
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223 }
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224
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225 def __getitem__(&self, key: PyObject) -> PyResult<PyObject> {
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226 // this conversion seems needless, but that's actually because
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227 // `index_getitem` does not handle conversion from PyLong,
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228 // which expressions such as [e for e in index] internally use.
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229 // Note that we don't seem to have a direct way to call
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230 // PySequence_GetItem (does the job), which would be better for
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231 // for performance
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232 let key = match key.extract::<Revision>(py) {
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233 Ok(rev) => rev.to_py_object(py).into_object(),
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234 Err(_) => key,
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235 };
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236 self.cindex(py).borrow().inner().get_item(py, key)
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237 }
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238
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239 def __setitem__(&self, key: PyObject, value: PyObject) -> PyResult<()> {
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240 self.cindex(py).borrow().inner().set_item(py, key, value)
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241 }
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242
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243 def __contains__(&self, item: PyObject) -> PyResult<bool> {
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244 // ObjectProtocol does not seem to provide contains(), so
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245 // this is an equivalent implementation of the index_contains()
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246 // defined in revlog.c
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247 let cindex = self.cindex(py).borrow();
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248 match item.extract::<Revision>(py) {
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249 Ok(rev) => {
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250 Ok(rev >= -1 && rev < cindex.inner().len(py)? as Revision)
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251 }
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252 Err(_) => {
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253 cindex.inner().call_method(
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254 py,
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255 "has_node",
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256 PyTuple::new(py, &[item]),
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257 None)?
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258 .extract(py)
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259 }
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260 }
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261 }
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262
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263 def nodemap_data_all(&self) -> PyResult<PyBytes> {
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264 self.inner_nodemap_data_all(py)
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265 }
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266
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267
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268 });
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269
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270 impl MixedIndex {
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271 fn new(py: Python, cindex: PyObject) -> PyResult<MixedIndex> {
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272 Self::create_instance(
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273 py,
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274 RefCell::new(cindex::Index::new(py, cindex)?),
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275 RefCell::new(None),
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276 )
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277 }
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278
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279 /// This is scaffolding at this point, but it could also become
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280 /// a way to start a persistent nodemap or perform a
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281 /// vacuum / repack operation
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282 fn fill_nodemap(
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283 &self,
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284 py: Python,
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285 nt: &mut NodeTree,
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286 ) -> PyResult<PyObject> {
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287 let index = self.cindex(py).borrow();
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288 for r in 0..index.len() {
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289 let rev = r as Revision;
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290 // in this case node() won't ever return None
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291 nt.insert(&*index, index.node(rev).unwrap(), rev)
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292 .map_err(|e| nodemap_error(py, e))?
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293 }
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294 Ok(py.None())
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295 }
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296
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297 fn get_nodetree<'a>(
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298 &'a self,
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299 py: Python<'a>,
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300 ) -> PyResult<&'a RefCell<Option<NodeTree>>> {
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301 if self.nt(py).borrow().is_none() {
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302 let readonly = Box::new(Vec::new());
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303 let mut nt = NodeTree::load_bytes(readonly, 0);
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304 self.fill_nodemap(py, &mut nt)?;
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305 self.nt(py).borrow_mut().replace(nt);
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306 }
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307 Ok(self.nt(py))
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308 }
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309
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310 /// forward a method call to the underlying C index
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311 fn call_cindex(
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312 &self,
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313 py: Python,
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314 name: &str,
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315 args: &PyTuple,
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316 kwargs: Option<&PyDict>,
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317 ) -> PyResult<PyObject> {
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318 self.cindex(py)
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319 .borrow()
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320 .inner()
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321 .call_method(py, name, args, kwargs)
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322 }
44010
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323
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324 pub fn clone_cindex(&self, py: Python) -> cindex::Index {
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325 self.cindex(py).borrow().clone_ref(py)
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326 }
44508
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327
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328 /// Returns the full nodemap bytes to be written as-is to disk
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329 fn inner_nodemap_data_all(&self, py: Python) -> PyResult<PyBytes> {
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330 let nodemap = self.get_nodetree(py)?.borrow_mut().take().unwrap();
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331 let (readonly, bytes) = nodemap.into_readonly_and_added_bytes();
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332
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333 // If there's anything readonly, we need to build the data again from
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334 // scratch
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335 let bytes = if readonly.len() > 0 {
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336 let mut nt = NodeTree::load_bytes(Box::new(vec![]), 0);
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337 self.fill_nodemap(py, &mut nt)?;
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338
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339 let (readonly, bytes) = nt.into_readonly_and_added_bytes();
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340 assert_eq!(readonly.len(), 0);
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341
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342 bytes
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343 } else {
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344 bytes
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345 };
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346
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347 let bytes = PyBytes::new(py, &bytes);
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348 Ok(bytes)
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349 }
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350 }
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351
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352 fn revlog_error(py: Python) -> PyErr {
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353 match py
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354 .import("mercurial.error")
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355 .and_then(|m| m.get(py, "RevlogError"))
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356 {
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357 Err(e) => e,
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358 Ok(cls) => PyErr::from_instance(py, cls),
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359 }
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360 }
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361
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362 fn rev_not_in_index(py: Python, rev: Revision) -> PyErr {
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363 PyErr::new::<ValueError, _>(
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364 py,
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365 format!(
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366 "Inconsistency: Revision {} found in nodemap \
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367 is not in revlog index",
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368 rev
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369 ),
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370 )
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371 }
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372
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373 /// Standard treatment of NodeMapError
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374 fn nodemap_error(py: Python, err: NodeMapError) -> PyErr {
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375 match err {
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376 NodeMapError::MultipleResults => revlog_error(py),
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377 NodeMapError::RevisionNotInIndex(r) => rev_not_in_index(py, r),
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378 NodeMapError::InvalidNodePrefix(s) => invalid_node_prefix(py, &s),
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379 }
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380 }
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381
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382 fn invalid_node_prefix(py: Python, ne: &NodeError) -> PyErr {
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383 PyErr::new::<ValueError, _>(
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384 py,
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385 format!("Invalid node or prefix: {:?}", ne),
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386 )
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387 }
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388
43961
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389 /// Create the module, with __package__ given from parent
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390 pub fn init_module(py: Python, package: &str) -> PyResult<PyModule> {
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391 let dotted_name = &format!("{}.revlog", package);
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392 let m = PyModule::new(py, dotted_name)?;
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393 m.add(py, "__package__", package)?;
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394 m.add(py, "__doc__", "RevLog - Rust implementations")?;
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395
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396 m.add_class::<MixedIndex>(py)?;
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397
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398 let sys = PyModule::import(py, "sys")?;
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399 let sys_modules: PyDict = sys.get(py, "modules")?.extract(py)?;
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400 sys_modules.set_item(py, dotted_name, &m)?;
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401
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402 Ok(m)
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403 }