annotate rust/hg-cpython/src/ancestors.rs @ 46334:4b0192f592cf

share: move share safe functionality out of experimental The share-safe functionality is complete and all configuration options are implemented. The behavior is well discussed on mailing list and in reviews. Let's unmark this as experimental to solve a chichen and egg issue. Differential Revision: https://phab.mercurial-scm.org/D9823
author Pulkit Goyal <7895pulkit@gmail.com>
date Mon, 18 Jan 2021 19:16:49 +0530
parents b24721e7c5ee
children 35ebe6f824be
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1 // ancestors.rs
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2 //
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3 // Copyright 2018 Georges Racinet <gracinet@anybox.fr>
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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 //! Bindings for the `hg::ancestors` module provided by the
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9 //! `hg-core` crate. From Python, this will be seen as `rustext.ancestor`
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10 //! and can be used as replacement for the the pure `ancestor` Python module.
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11 //!
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12 //! # Classes visible from Python:
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13 //! - [`LazyAncestors`] is the Rust implementation of
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14 //! `mercurial.ancestor.lazyancestors`. The only difference is that it is
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15 //! instantiated with a C `parsers.index` instance instead of a parents
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16 //! function.
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17 //!
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18 //! - [`MissingAncestors`] is the Rust implementation of
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19 //! `mercurial.ancestor.incrementalmissingancestors`.
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20 //!
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21 //! API differences:
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22 //! + it is instantiated with a C `parsers.index`
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23 //! instance instead of a parents function.
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24 //! + `MissingAncestors.bases` is a method returning a tuple instead of
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25 //! a set-valued attribute. We could return a Python set easily if our
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26 //! [PySet PR](https://github.com/dgrunwald/rust-cpython/pull/165)
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27 //! is accepted.
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28 //!
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29 //! - [`AncestorsIterator`] is the Rust counterpart of the
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30 //! `ancestor._lazyancestorsiter` Python generator. From Python, instances of
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31 //! this should be mainly obtained by calling `iter()` on a [`LazyAncestors`]
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32 //! instance.
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33 //!
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34 //! [`LazyAncestors`]: struct.LazyAncestors.html
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35 //! [`MissingAncestors`]: struct.MissingAncestors.html
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36 //! [`AncestorsIterator`]: struct.AncestorsIterator.html
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37 use crate::revlog::pyindex_to_graph;
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38 use crate::{
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39 cindex::Index, conversion::rev_pyiter_collect, exceptions::GraphError,
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40 };
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41 use cpython::{
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42 ObjectProtocol, PyClone, PyDict, PyList, PyModule, PyObject, PyResult,
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43 Python, PythonObject, ToPyObject,
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44 };
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45 use hg::Revision;
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46 use hg::{
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47 AncestorsIterator as CoreIterator, LazyAncestors as CoreLazy,
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48 MissingAncestors as CoreMissing,
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49 };
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50 use std::cell::RefCell;
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51 use std::collections::HashSet;
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52
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53 py_class!(pub class AncestorsIterator |py| {
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54 data inner: RefCell<Box<CoreIterator<Index>>>;
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55
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56 def __next__(&self) -> PyResult<Option<Revision>> {
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57 match self.inner(py).borrow_mut().next() {
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58 Some(Err(e)) => Err(GraphError::pynew(py, e)),
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59 None => Ok(None),
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60 Some(Ok(r)) => Ok(Some(r)),
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61 }
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62 }
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63
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64 def __contains__(&self, rev: Revision) -> PyResult<bool> {
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65 self.inner(py).borrow_mut().contains(rev)
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66 .map_err(|e| GraphError::pynew(py, e))
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67 }
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68
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69 def __iter__(&self) -> PyResult<Self> {
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70 Ok(self.clone_ref(py))
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71 }
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72
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73 def __new__(_cls, index: PyObject, initrevs: PyObject, stoprev: Revision,
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74 inclusive: bool) -> PyResult<AncestorsIterator> {
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75 let initvec: Vec<Revision> = rev_pyiter_collect(py, &initrevs)?;
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76 let ait = CoreIterator::new(
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77 pyindex_to_graph(py, index)?,
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78 initvec,
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79 stoprev,
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80 inclusive,
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81 )
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82 .map_err(|e| GraphError::pynew(py, e))?;
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83 AncestorsIterator::from_inner(py, ait)
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84 }
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85
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86 });
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87
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88 impl AncestorsIterator {
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89 pub fn from_inner(py: Python, ait: CoreIterator<Index>) -> PyResult<Self> {
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90 Self::create_instance(py, RefCell::new(Box::new(ait)))
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91 }
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92 }
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93
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94 py_class!(pub class LazyAncestors |py| {
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95 data inner: RefCell<Box<CoreLazy<Index>>>;
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96
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97 def __contains__(&self, rev: Revision) -> PyResult<bool> {
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98 self.inner(py)
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99 .borrow_mut()
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100 .contains(rev)
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101 .map_err(|e| GraphError::pynew(py, e))
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102 }
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103
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104 def __iter__(&self) -> PyResult<AncestorsIterator> {
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105 AncestorsIterator::from_inner(py, self.inner(py).borrow().iter())
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106 }
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107
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108 def __bool__(&self) -> PyResult<bool> {
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109 Ok(!self.inner(py).borrow().is_empty())
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110 }
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111
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112 def __new__(_cls, index: PyObject, initrevs: PyObject, stoprev: Revision,
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113 inclusive: bool) -> PyResult<Self> {
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114 let initvec: Vec<Revision> = rev_pyiter_collect(py, &initrevs)?;
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115
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116 let lazy =
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117 CoreLazy::new(pyindex_to_graph(py, index)?,
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118 initvec, stoprev, inclusive)
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119 .map_err(|e| GraphError::pynew(py, e))?;
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120
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121 Self::create_instance(py, RefCell::new(Box::new(lazy)))
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122 }
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123
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124 });
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125
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126 py_class!(pub class MissingAncestors |py| {
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127 data inner: RefCell<Box<CoreMissing<Index>>>;
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128
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129 def __new__(
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130 _cls,
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131 index: PyObject,
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132 bases: PyObject
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133 )
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134 -> PyResult<MissingAncestors> {
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135 let bases_vec: Vec<Revision> = rev_pyiter_collect(py, &bases)?;
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136 let inner = CoreMissing::new(pyindex_to_graph(py, index)?, bases_vec);
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137 MissingAncestors::create_instance(py, RefCell::new(Box::new(inner)))
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138 }
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139
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140 def hasbases(&self) -> PyResult<bool> {
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141 Ok(self.inner(py).borrow().has_bases())
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142 }
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143
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144 def addbases(&self, bases: PyObject) -> PyResult<PyObject> {
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145 let mut inner = self.inner(py).borrow_mut();
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146 let bases_vec: Vec<Revision> = rev_pyiter_collect(py, &bases)?;
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147 inner.add_bases(bases_vec);
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148 // cpython doc has examples with PyResult<()> but this gives me
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149 // the trait `cpython::ToPyObject` is not implemented for `()`
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150 // so let's return an explicit None
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151 Ok(py.None())
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152 }
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153
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154 def bases(&self) -> PyResult<HashSet<Revision>> {
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155 Ok(self.inner(py).borrow().get_bases().clone())
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156 }
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157
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158 def basesheads(&self) -> PyResult<HashSet<Revision>> {
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159 let inner = self.inner(py).borrow();
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160 inner.bases_heads().map_err(|e| GraphError::pynew(py, e))
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161 }
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162
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163 def removeancestorsfrom(&self, revs: PyObject) -> PyResult<PyObject> {
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164 let mut inner = self.inner(py).borrow_mut();
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165 // this is very lame: we convert to a Rust set, update it in place
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166 // and then convert back to Python, only to have Python remove the
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167 // excess (thankfully, Python is happy with a list or even an iterator)
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168 // Leads to improve this:
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169 // - have the CoreMissing instead do something emit revisions to
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170 // discard
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171 // - define a trait for sets of revisions in the core and implement
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172 // it for a Python set rewrapped with the GIL marker
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173 let mut revs_pyset: HashSet<Revision> = rev_pyiter_collect(py, &revs)?;
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174 inner.remove_ancestors_from(&mut revs_pyset)
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175 .map_err(|e| GraphError::pynew(py, e))?;
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176
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177 // convert as Python list
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178 let mut remaining_pyint_vec: Vec<PyObject> = Vec::with_capacity(
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179 revs_pyset.len());
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180 for rev in revs_pyset {
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181 remaining_pyint_vec.push(rev.to_py_object(py).into_object());
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182 }
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183 let remaining_pylist = PyList::new(py, remaining_pyint_vec.as_slice());
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184 revs.call_method(py, "intersection_update", (remaining_pylist, ), None)
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185 }
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186
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187 def missingancestors(&self, revs: PyObject) -> PyResult<PyList> {
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188 let mut inner = self.inner(py).borrow_mut();
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189 let revs_vec: Vec<Revision> = rev_pyiter_collect(py, &revs)?;
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190 let missing_vec = match inner.missing_ancestors(revs_vec) {
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191 Ok(missing) => missing,
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192 Err(e) => {
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193 return Err(GraphError::pynew(py, e));
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194 }
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195 };
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196 // convert as Python list
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197 let mut missing_pyint_vec: Vec<PyObject> = Vec::with_capacity(
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198 missing_vec.len());
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199 for rev in missing_vec {
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200 missing_pyint_vec.push(rev.to_py_object(py).into_object());
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201 }
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202 Ok(PyList::new(py, missing_pyint_vec.as_slice()))
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203 }
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204 });
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205
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206 /// Create the module, with __package__ given from parent
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207 pub fn init_module(py: Python, package: &str) -> PyResult<PyModule> {
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208 let dotted_name = &format!("{}.ancestor", package);
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209 let m = PyModule::new(py, dotted_name)?;
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210 m.add(py, "__package__", package)?;
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211 m.add(
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212 py,
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213 "__doc__",
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214 "Generic DAG ancestor algorithms - Rust implementation",
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215 )?;
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216 m.add_class::<AncestorsIterator>(py)?;
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217 m.add_class::<LazyAncestors>(py)?;
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218 m.add_class::<MissingAncestors>(py)?;
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219
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220 let sys = PyModule::import(py, "sys")?;
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221 let sys_modules: PyDict = sys.get(py, "modules")?.extract(py)?;
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222 sys_modules.set_item(py, dotted_name, &m)?;
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223 // Example C code (see pyexpat.c and import.c) will "give away the
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224 // reference", but we won't because it will be consumed once the
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225 // Rust PyObject is dropped.
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226 Ok(m)
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227 }