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annotate rust/hg-cpython/src/revlog.rs @ 44506:26dd35ac59b8

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rust-nodemap: add utils for propagating errors This also updates the copyright notice Differential Revision: https://phab.mercurial-scm.org/D8156
author Georges Racinet <georges.racinet@octobus.net>
date Tue, 11 Feb 2020 16:30:28 +0100
parents 887d0f921b34
children 857cc79247ac
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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::cindex;
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9 use cpython::{
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10 exc::ValueError, ObjectProtocol, PyClone, PyDict, PyErr, PyModule,
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11 PyObject, PyResult, PyTuple, Python, PythonObject, ToPyObject,
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12 };
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13 use hg::{nodemap::NodeMapError, NodeError, 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(
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18 py: Python,
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19 index: PyObject,
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20 ) -> PyResult<cindex::Index> {
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21 match index.extract::<MixedIndex>(py) {
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22 Ok(midx) => Ok(midx.clone_cindex(py)),
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23 Err(_) => cindex::Index::new(py, index),
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24 }
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25 }
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26
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27 py_class!(pub class MixedIndex |py| {
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28 data cindex: RefCell<cindex::Index>;
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29
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30 def __new__(_cls, cindex: PyObject) -> PyResult<MixedIndex> {
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31 Self::new(py, cindex)
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32 }
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33
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34 /// Compatibility layer used for Python consumers needing access to the C index
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35 ///
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36 /// Only use case so far is `scmutil.shortesthexnodeidprefix`,
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37 /// that may need to build a custom `nodetree`, based on a specified revset.
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38 /// With a Rust implementation of the nodemap, we will be able to get rid of
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39 /// this, by exposing our own standalone nodemap class,
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40 /// ready to accept `MixedIndex`.
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41 def get_cindex(&self) -> PyResult<PyObject> {
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42 Ok(self.cindex(py).borrow().inner().clone_ref(py))
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43 }
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44
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46 // Reforwarded C index API
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47
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48 // index_methods (tp_methods). Same ordering as in revlog.c
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49
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50 /// return the gca set of the given revs
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51 def ancestors(&self, *args, **kw) -> PyResult<PyObject> {
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52 self.call_cindex(py, "ancestors", args, kw)
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53 }
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54
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55 /// return the heads of the common ancestors of the given revs
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56 def commonancestorsheads(&self, *args, **kw) -> PyResult<PyObject> {
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57 self.call_cindex(py, "commonancestorsheads", args, kw)
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58 }
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59
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60 /// clear the index caches
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61 def clearcaches(&self, *args, **kw) -> PyResult<PyObject> {
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62 self.call_cindex(py, "clearcaches", args, kw)
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63 }
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64
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65 /// get an index entry
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66 def get(&self, *args, **kw) -> PyResult<PyObject> {
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67 self.call_cindex(py, "get", args, kw)
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68 }
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69
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70 /// return `rev` associated with a node or None
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71 def get_rev(&self, *args, **kw) -> PyResult<PyObject> {
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72 self.call_cindex(py, "get_rev", args, kw)
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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, *args, **kw) -> PyResult<PyObject> {
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77 self.call_cindex(py, "has_node", args, kw)
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78 }
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79
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80 /// return `rev` associated with a node or raise RevlogError
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81 def rev(&self, *args, **kw) -> PyResult<PyObject> {
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82 self.call_cindex(py, "rev", args, kw)
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83 }
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84
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85 /// compute phases
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86 def computephasesmapsets(&self, *args, **kw) -> PyResult<PyObject> {
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87 self.call_cindex(py, "computephasesmapsets", args, kw)
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88 }
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89
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90 /// reachableroots
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91 def reachableroots2(&self, *args, **kw) -> PyResult<PyObject> {
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92 self.call_cindex(py, "reachableroots2", args, kw)
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93 }
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94
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95 /// get head revisions
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96 def headrevs(&self, *args, **kw) -> PyResult<PyObject> {
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97 self.call_cindex(py, "headrevs", args, kw)
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98 }
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99
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100 /// get filtered head revisions
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101 def headrevsfiltered(&self, *args, **kw) -> PyResult<PyObject> {
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102 self.call_cindex(py, "headrevsfiltered", args, kw)
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103 }
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104
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105 /// True if the object is a snapshot
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106 def issnapshot(&self, *args, **kw) -> PyResult<PyObject> {
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107 self.call_cindex(py, "issnapshot", args, kw)
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108 }
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109
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110 /// Gather snapshot data in a cache dict
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111 def findsnapshots(&self, *args, **kw) -> PyResult<PyObject> {
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112 self.call_cindex(py, "findsnapshots", args, kw)
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113 }
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114
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115 /// determine revisions with deltas to reconstruct fulltext
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116 def deltachain(&self, *args, **kw) -> PyResult<PyObject> {
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117 self.call_cindex(py, "deltachain", args, kw)
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118 }
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119
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120 /// slice planned chunk read to reach a density threshold
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121 def slicechunktodensity(&self, *args, **kw) -> PyResult<PyObject> {
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122 self.call_cindex(py, "slicechunktodensity", args, kw)
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123 }
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124
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125 /// append an index entry
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126 def append(&self, *args, **kw) -> PyResult<PyObject> {
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127 self.call_cindex(py, "append", args, kw)
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128 }
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129
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130 /// match a potentially ambiguous node ID
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131 def partialmatch(&self, *args, **kw) -> PyResult<PyObject> {
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132 self.call_cindex(py, "partialmatch", args, kw)
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133 }
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134
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135 /// find length of shortest hex nodeid of a binary ID
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136 def shortest(&self, *args, **kw) -> PyResult<PyObject> {
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137 self.call_cindex(py, "shortest", args, kw)
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138 }
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139
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140 /// stats for the index
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141 def stats(&self, *args, **kw) -> PyResult<PyObject> {
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142 self.call_cindex(py, "stats", args, kw)
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143 }
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144
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145 // index_sequence_methods and index_mapping_methods.
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146 //
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147 // Since we call back through the high level Python API,
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148 // there's no point making a distinction between index_get
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149 // and index_getitem.
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150
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151 def __len__(&self) -> PyResult<usize> {
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152 self.cindex(py).borrow().inner().len(py)
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153 }
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154
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155 def __getitem__(&self, key: PyObject) -> PyResult<PyObject> {
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156 // this conversion seems needless, but that's actually because
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157 // `index_getitem` does not handle conversion from PyLong,
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158 // which expressions such as [e for e in index] internally use.
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159 // Note that we don't seem to have a direct way to call
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160 // PySequence_GetItem (does the job), which would be better for
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161 // for performance
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162 let key = match key.extract::<Revision>(py) {
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163 Ok(rev) => rev.to_py_object(py).into_object(),
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164 Err(_) => key,
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165 };
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166 self.cindex(py).borrow().inner().get_item(py, key)
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167 }
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168
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169 def __setitem__(&self, key: PyObject, value: PyObject) -> PyResult<()> {
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170 self.cindex(py).borrow().inner().set_item(py, key, value)
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171 }
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172
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173 def __delitem__(&self, key: PyObject) -> PyResult<()> {
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174 self.cindex(py).borrow().inner().del_item(py, key)
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175 }
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176
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177 def __contains__(&self, item: PyObject) -> PyResult<bool> {
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178 // ObjectProtocol does not seem to provide contains(), so
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179 // this is an equivalent implementation of the index_contains()
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180 // defined in revlog.c
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181 let cindex = self.cindex(py).borrow();
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182 match item.extract::<Revision>(py) {
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183 Ok(rev) => {
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184 Ok(rev >= -1 && rev < cindex.inner().len(py)? as Revision)
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185 }
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186 Err(_) => {
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187 cindex.inner().call_method(
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188 py,
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189 "has_node",
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190 PyTuple::new(py, &[item]),
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191 None)?
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192 .extract(py)
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193 }
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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 });
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199
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200 impl MixedIndex {
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201 fn new(py: Python, cindex: PyObject) -> PyResult<MixedIndex> {
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202 Self::create_instance(
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203 py,
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204 RefCell::new(cindex::Index::new(py, cindex)?),
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205 )
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206 }
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207
43961
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208 /// forward a method call to the underlying C index
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209 fn call_cindex(
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210 &self,
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211 py: Python,
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212 name: &str,
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213 args: &PyTuple,
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214 kwargs: Option<&PyDict>,
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215 ) -> PyResult<PyObject> {
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216 self.cindex(py)
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217 .borrow()
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218 .inner()
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219 .call_method(py, name, args, kwargs)
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220 }
44010
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221
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222 pub fn clone_cindex(&self, py: Python) -> cindex::Index {
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223 self.cindex(py).borrow().clone_ref(py)
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224 }
43961
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225 }
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226
44506
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227 fn revlog_error(py: Python) -> PyErr {
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228 match py
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229 .import("mercurial.error")
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230 .and_then(|m| m.get(py, "RevlogError"))
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231 {
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232 Err(e) => e,
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233 Ok(cls) => PyErr::from_instance(py, cls),
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234 }
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235 }
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236
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237 fn rev_not_in_index(py: Python, rev: Revision) -> PyErr {
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238 PyErr::new::<ValueError, _>(
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239 py,
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diff changeset
240 format!(
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241 "Inconsistency: Revision {} found in nodemap \
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diff changeset
242 is not in revlog index",
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Georges Racinet <georges.racinet@octobus.net>
parents: 44503
diff changeset
243 rev
26dd35ac59b8 rust-nodemap: add utils for propagating errors
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diff changeset
244 ),
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245 )
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246 }
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247
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248 /// Standard treatment of NodeMapError
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249 fn nodemap_error(py: Python, err: NodeMapError) -> PyErr {
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250 match err {
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251 NodeMapError::MultipleResults => revlog_error(py),
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252 NodeMapError::RevisionNotInIndex(r) => rev_not_in_index(py, r),
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253 NodeMapError::InvalidNodePrefix(s) => invalid_node_prefix(py, &s),
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254 }
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255 }
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256
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257 fn invalid_node_prefix(py: Python, ne: &NodeError) -> PyErr {
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258 PyErr::new::<ValueError, _>(
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259 py,
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260 format!("Invalid node or prefix: {:?}", ne),
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261 )
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262 }
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263
43961
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264 /// Create the module, with __package__ given from parent
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265 pub fn init_module(py: Python, package: &str) -> PyResult<PyModule> {
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266 let dotted_name = &format!("{}.revlog", package);
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267 let m = PyModule::new(py, dotted_name)?;
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268 m.add(py, "__package__", package)?;
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269 m.add(py, "__doc__", "RevLog - Rust implementations")?;
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270
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271 m.add_class::<MixedIndex>(py)?;
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272
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273 let sys = PyModule::import(py, "sys")?;
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274 let sys_modules: PyDict = sys.get(py, "modules")?.extract(py)?;
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275 sys_modules.set_item(py, dotted_name, &m)?;
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276
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277 Ok(m)
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278 }