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annotate rust/hg-pyo3/src/revision.rs @ 52853:c6707e112d96

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rust-pyo3-dirstate: exceptions for dirstate errors
author Georges Racinet <georges.racinet@cloudcrane.io>
date Wed, 29 Jan 2025 14:03:24 +0100
parents 28f0f00b5dbd
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 use pyo3::prelude::*;
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2 use pyo3::types::{PyList, PySet};
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3
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4 use hg::revlog::RevlogIndex;
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5 use hg::{BaseRevision, Revision, UncheckedRevision};
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6
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7 use crate::exceptions::{rev_not_in_index, GraphError};
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8 use crate::utils::proxy_index_extract;
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9
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10 /// Revision as exposed to/from the Python layer.
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11 ///
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12 /// We need this indirection because of the orphan rule, meaning we can't
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13 /// implement a foreign trait (like [`cpython::ToPyObject`])
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14 /// for a foreign type (like [`hg::UncheckedRevision`]).
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15 ///
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16 /// This also acts as a deterrent against blindly trusting Python to send
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17 /// us valid revision numbers.
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18 #[derive(
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19 Debug,
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20 Copy,
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21 Clone,
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22 PartialEq,
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23 Eq,
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24 PartialOrd,
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25 Ord,
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26 Hash,
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27 derive_more::From,
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28 IntoPyObject,
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29 FromPyObject,
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30 )]
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31 pub struct PyRevision(pub BaseRevision);
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32
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33 impl From<Revision> for PyRevision {
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34 fn from(r: Revision) -> Self {
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35 PyRevision(r.0)
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36 }
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37 }
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38
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39 impl From<PyRevision> for UncheckedRevision {
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40 fn from(val: PyRevision) -> Self {
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41 val.0.into()
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42 }
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43 }
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44
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45 pub fn check_revision(
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46 index: &impl RevlogIndex,
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47 rev: impl Into<UncheckedRevision>,
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48 ) -> PyResult<Revision> {
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49 let rev = rev.into();
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50 index
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51 .check_revision(rev)
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52 .ok_or_else(|| rev_not_in_index(rev))
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53 }
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54
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55 /// Utility function to convert a Python iterable into various collections
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56 ///
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57 /// We need this in particular
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58 /// - because of the checked upgrade from [`PyRevision`] to [`Revision`].
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59 /// - to feed to various methods of inner objects with `impl
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60 /// IntoIterator<Item=Revision>` arguments, because a `PyErr` can arise at
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61 /// each step of iteration, whereas these methods expect iterables over
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62 /// `Revision`, not over some `Result<Revision, PyErr>`
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63 pub fn rev_pyiter_collect<C, I>(
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64 revs: &Bound<'_, PyAny>,
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65 index: &I,
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66 ) -> PyResult<C>
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67 where
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68 C: FromIterator<Revision>,
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69 I: RevlogIndex,
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70 {
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71 rev_pyiter_collect_or_else(revs, index, |r| {
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72 PyErr::new::<GraphError, _>(("InvalidRevision", r.0))
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73 })
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74 }
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75
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76 pub fn rev_pyiter_collect_with_py_index<C>(
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77 revs: &Bound<'_, PyAny>,
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78 proxy_index: &Bound<'_, PyAny>,
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79 ) -> PyResult<C>
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80 where
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81 C: FromIterator<Revision>,
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82 {
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83 // Safety: we don't leak the "faked" reference out of `UnsafePyLeaked`
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84 let borrowed_idx = unsafe { proxy_index_extract(proxy_index)? };
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85 rev_pyiter_collect(revs, borrowed_idx)
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86 }
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87
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88 /// Same as [`rev_pyiter_collect`], giving control on returned errors
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89 pub fn rev_pyiter_collect_or_else<C, I>(
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90 revs: &Bound<'_, PyAny>,
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91 index: &I,
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92 invalid_rev_error: impl FnOnce(PyRevision) -> PyErr + Copy,
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93 ) -> PyResult<C>
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94 where
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95 C: FromIterator<Revision>,
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96 I: RevlogIndex,
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97 {
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98 revs.try_iter()?
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99 .map(|r| {
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100 r.and_then(|o| match o.extract::<PyRevision>() {
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101 Ok(r) => index
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102 .check_revision(UncheckedRevision(r.0))
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103 .ok_or_else(|| invalid_rev_error(r)),
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104 Err(e) => Err(e),
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105 })
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106 })
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107 .collect()
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108 }
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109
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110 pub fn revs_py_list<U>(
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111 py: Python<'_>,
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112 revs: impl IntoIterator<Item = Revision, IntoIter = U>,
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113 ) -> PyResult<Py<PyList>>
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114 where
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115 U: ExactSizeIterator<Item = Revision>,
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116 {
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117 Ok(PyList::new(py, revs.into_iter().map(PyRevision::from))?.unbind())
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118 }
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119
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120 pub fn revs_py_set<U>(
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121 py: Python<'_>,
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122 revs: impl IntoIterator<Item = Revision, IntoIter = U>,
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123 ) -> PyResult<Py<PySet>>
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124 where
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125 U: ExactSizeIterator<Item = Revision>,
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126 {
0fc15732fe7b rust-pyo3: helper to return sets of revisions
Georges Racinet <georges.racinet@cloudcrane.io>
parents: 52795
diff changeset
127 Ok(PySet::new(py, revs.into_iter().map(PyRevision::from))?.unbind())
0fc15732fe7b rust-pyo3: helper to return sets of revisions
Georges Racinet <georges.racinet@cloudcrane.io>
parents: 52795
diff changeset
128 }