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annotate rust/hg-cpython/src/revlog.rs @ 44013:2728fcb8127c

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rust-index: make it possible to clone the struct referencing the C index If we are to hand over the C index object to other code, we need to be able to create a new python reference to it. Differential Revision: https://phab.mercurial-scm.org/D7656
author Georges Racinet <georges.racinet@octobus.net>
date Fri, 13 Dec 2019 19:52:26 +0100
parents b69d5f3a41d0
children c627f1b2f3c3
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1 // revlog.rs
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2 //
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3 // Copyright 2019 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::cindex;
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9 use cpython::{
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10 ObjectProtocol, PyClone, PyDict, PyModule, PyObject, PyResult, PyTuple, Python, PythonObject,
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11 ToPyObject,
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12 };
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13 use hg::Revision;
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14 use std::cell::RefCell;
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15
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16 /// Return a Struct implementing the Graph trait
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17 pub(crate) fn pyindex_to_graph(py: Python, index: PyObject) -> PyResult<cindex::Index> {
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18 cindex::Index::new(py, index)
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19 }
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20
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21 py_class!(pub class MixedIndex |py| {
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22 data cindex: RefCell<cindex::Index>;
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23
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24 def __new__(_cls, cindex: PyObject) -> PyResult<MixedIndex> {
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25 Self::create_instance(py, RefCell::new(
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26 cindex::Index::new(py, cindex)?))
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27 }
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28
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29
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30 // Reforwarded C index API
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31
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32 // index_methods (tp_methods). Same ordering as in revlog.c
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33
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34 /// return the gca set of the given revs
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35 def ancestors(&self, *args, **kw) -> PyResult<PyObject> {
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36 self.call_cindex(py, "ancestors", args, kw)
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37 }
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38
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39 /// return the heads of the common ancestors of the given revs
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40 def commonancestorsheads(&self, *args, **kw) -> PyResult<PyObject> {
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41 self.call_cindex(py, "commonancestorsheads", args, kw)
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42 }
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43
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44 /// clear the index caches
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45 def clearcaches(&self, *args, **kw) -> PyResult<PyObject> {
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46 self.call_cindex(py, "clearcaches", args, kw)
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47 }
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48
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49 /// get an index entry
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50 def get(&self, *args, **kw) -> PyResult<PyObject> {
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51 self.call_cindex(py, "get", args, kw)
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52 }
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53
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54 /// return `rev` associated with a node or None
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55 def get_rev(&self, *args, **kw) -> PyResult<PyObject> {
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56 self.call_cindex(py, "get_rev", args, kw)
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57 }
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58
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59 /// return True if the node exist in the index
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60 def has_node(&self, *args, **kw) -> PyResult<PyObject> {
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61 self.call_cindex(py, "has_node", args, kw)
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62 }
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63
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64 /// return `rev` associated with a node or raise RevlogError
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65 def rev(&self, *args, **kw) -> PyResult<PyObject> {
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66 self.call_cindex(py, "rev", args, kw)
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67 }
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68
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69 /// compute phases
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70 def computephasesmapsets(&self, *args, **kw) -> PyResult<PyObject> {
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71 self.call_cindex(py, "computephasesmapsets", args, kw)
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72 }
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73
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74 /// reachableroots
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75 def reachableroots2(&self, *args, **kw) -> PyResult<PyObject> {
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76 self.call_cindex(py, "reachableroots2", args, kw)
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77 }
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78
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79 /// get head revisions
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80 def headrevs(&self, *args, **kw) -> PyResult<PyObject> {
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81 self.call_cindex(py, "headrevs", args, kw)
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82 }
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83
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84 /// get filtered head revisions
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85 def headrevsfiltered(&self, *args, **kw) -> PyResult<PyObject> {
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86 self.call_cindex(py, "headrevsfiltered", args, kw)
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87 }
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88
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89 /// True if the object is a snapshot
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90 def issnapshot(&self, *args, **kw) -> PyResult<PyObject> {
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91 self.call_cindex(py, "issnapshot", args, kw)
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92 }
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93
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94 /// Gather snapshot data in a cache dict
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95 def findsnapshots(&self, *args, **kw) -> PyResult<PyObject> {
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96 self.call_cindex(py, "findsnapshots", args, kw)
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97 }
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98
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99 /// determine revisions with deltas to reconstruct fulltext
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100 def deltachain(&self, *args, **kw) -> PyResult<PyObject> {
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101 self.call_cindex(py, "deltachain", args, kw)
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102 }
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103
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104 /// slice planned chunk read to reach a density threshold
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105 def slicechunktodensity(&self, *args, **kw) -> PyResult<PyObject> {
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106 self.call_cindex(py, "slicechunktodensity", args, kw)
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107 }
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108
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109 /// append an index entry
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110 def append(&self, *args, **kw) -> PyResult<PyObject> {
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111 self.call_cindex(py, "append", args, kw)
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112 }
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113
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114 /// match a potentially ambiguous node ID
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115 def partialmatch(&self, *args, **kw) -> PyResult<PyObject> {
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116 self.call_cindex(py, "partialmatch", args, kw)
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117 }
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118
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119 /// find length of shortest hex nodeid of a binary ID
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120 def shortest(&self, *args, **kw) -> PyResult<PyObject> {
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121 self.call_cindex(py, "shortest", args, kw)
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122 }
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123
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124 /// stats for the index
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125 def stats(&self, *args, **kw) -> PyResult<PyObject> {
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126 self.call_cindex(py, "stats", args, kw)
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127 }
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128
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129 // index_sequence_methods and index_mapping_methods.
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130 //
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131 // Since we call back through the high level Python API,
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132 // there's no point making a distinction between index_get
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133 // and index_getitem.
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134
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135 def __len__(&self) -> PyResult<usize> {
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136 self.cindex(py).borrow().inner().len(py)
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137 }
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138
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139 def __getitem__(&self, key: PyObject) -> PyResult<PyObject> {
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140 // this conversion seems needless, but that's actually because
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141 // `index_getitem` does not handle conversion from PyLong,
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142 // which expressions such as [e for e in index] internally use.
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143 // Note that we don't seem to have a direct way to call
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144 // PySequence_GetItem (does the job), which would be better for
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145 // for performance
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146 let key = match key.extract::<Revision>(py) {
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147 Ok(rev) => rev.to_py_object(py).into_object(),
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148 Err(_) => key,
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149 };
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150 self.cindex(py).borrow().inner().get_item(py, key)
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151 }
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152
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153 def __setitem__(&self, key: PyObject, value: PyObject) -> PyResult<()> {
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154 self.cindex(py).borrow().inner().set_item(py, key, value)
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155 }
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156
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157 def __delitem__(&self, key: PyObject) -> PyResult<()> {
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158 self.cindex(py).borrow().inner().del_item(py, key)
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159 }
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160
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161 def __contains__(&self, item: PyObject) -> PyResult<bool> {
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162 // ObjectProtocol does not seem to provide contains(), so
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163 // this is an equivalent implementation of the index_contains()
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164 // defined in revlog.c
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165 let cindex = self.cindex(py).borrow();
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166 match item.extract::<Revision>(py) {
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167 Ok(rev) => {
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168 Ok(rev >= -1 && rev < cindex.inner().len(py)? as Revision)
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169 }
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170 Err(_) => {
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171 cindex.inner().call_method(
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172 py,
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173 "has_node",
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174 PyTuple::new(py, &[item]),
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175 None)?
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176 .extract(py)
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177 }
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178 }
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179 }
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180
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181
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182 });
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183
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184 impl MixedIndex {
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185 /// forward a method call to the underlying C index
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186 fn call_cindex(
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187 &self,
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188 py: Python,
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189 name: &str,
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190 args: &PyTuple,
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191 kwargs: Option<&PyDict>,
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192 ) -> PyResult<PyObject> {
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193 self.cindex(py)
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194 .borrow()
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195 .inner()
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196 .call_method(py, name, args, kwargs)
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197 }
44013
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198
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199 pub fn clone_cindex(&self, py: Python) -> cindex::Index {
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200 self.cindex(py).borrow().clone_ref(py)
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201 }
43966
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202 }
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203
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204 /// Create the module, with __package__ given from parent
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205 pub fn init_module(py: Python, package: &str) -> PyResult<PyModule> {
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206 let dotted_name = &format!("{}.revlog", package);
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207 let m = PyModule::new(py, dotted_name)?;
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208 m.add(py, "__package__", package)?;
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209 m.add(py, "__doc__", "RevLog - Rust implementations")?;
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210
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211 m.add_class::<MixedIndex>(py)?;
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212
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213 let sys = PyModule::import(py, "sys")?;
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214 let sys_modules: PyDict = sys.get(py, "modules")?.extract(py)?;
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215 sys_modules.set_item(py, dotted_name, &m)?;
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216
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217 Ok(m)
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218 }