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annotate rust/hg-cpython/src/ref_sharing.rs @ 44297:6b7aef44274b

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rust-cpython: remove PySharedRefCell and its companion structs Also updates py_shared_iterator!() documentation accordingly.
author Yuya Nishihara <yuya@tcha.org>
date Sat, 25 Jan 2020 17:30:24 +0900
parents e960c30d7e50
children f90796d33aa0
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1 // ref_sharing.rs
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2 //
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3 // Copyright 2019 Raphaël Gomès <rgomes@octobus.net>
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4 //
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5 // Permission is hereby granted, free of charge, to any person obtaining a copy
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6 // of this software and associated documentation files (the "Software"), to
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7 // deal in the Software without restriction, including without limitation the
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8 // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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9 // sell copies of the Software, and to permit persons to whom the Software is
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10 // furnished to do so, subject to the following conditions:
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11 //
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12 // The above copyright notice and this permission notice shall be included in
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13 // all copies or substantial portions of the Software.
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14 //
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15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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16 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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17 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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18 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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19 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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20 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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21 // IN THE SOFTWARE.
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22
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23 //! Macros for use in the `hg-cpython` bridge library.
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24
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25 /// Defines a `py_class!` that acts as a Python iterator over a Rust iterator.
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26 ///
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27 /// TODO: this is a bit awkward to use, and a better (more complicated)
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28 /// procedural macro would simplify the interface a lot.
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29 ///
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30 /// # Parameters
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31 ///
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32 /// * `$name` is the identifier to give to the resulting Rust struct.
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33 /// * `$leaked` corresponds to `UnsafePyLeaked` in the matching `@shared data`
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34 /// declaration.
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35 /// * `$iterator_type` is the type of the Rust iterator.
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36 /// * `$success_func` is a function for processing the Rust `(key, value)`
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37 /// tuple on iteration success, turning it into something Python understands.
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38 /// * `$success_func` is the return type of `$success_func`
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39 ///
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40 /// # Safety
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41 ///
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42 /// `$success_func` may take a reference, but it's lifetime may be cheated.
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43 /// Do not copy it out of the function call.
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44 ///
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45 /// # Example
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46 ///
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47 /// ```
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48 /// struct MyStruct {
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49 /// inner: HashMap<Vec<u8>, Vec<u8>>;
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50 /// }
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51 ///
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52 /// py_class!(pub class MyType |py| {
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53 /// @shared data inner: MyStruct;
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54 ///
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55 /// def __iter__(&self) -> PyResult<MyTypeItemsIterator> {
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56 /// let leaked_ref = self.inner_shared(py).leak_immutable();
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57 /// MyTypeItemsIterator::from_inner(
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58 /// py,
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59 /// unsafe { leaked_ref.map(py, |o| o.iter()) },
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60 /// )
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61 /// }
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62 /// });
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63 ///
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64 /// impl MyType {
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65 /// fn translate_key_value(
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66 /// py: Python,
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67 /// res: (&Vec<u8>, &Vec<u8>),
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68 /// ) -> PyResult<Option<(PyBytes, PyBytes)>> {
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69 /// let (f, entry) = res;
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70 /// Ok(Some((
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71 /// PyBytes::new(py, f),
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72 /// PyBytes::new(py, entry),
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73 /// )))
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74 /// }
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75 /// }
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76 ///
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77 /// py_shared_iterator!(
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78 /// MyTypeItemsIterator,
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79 /// UnsafePyLeaked<HashMap<'static, Vec<u8>, Vec<u8>>>,
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80 /// MyType::translate_key_value,
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81 /// Option<(PyBytes, PyBytes)>
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82 /// );
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83 /// ```
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84 macro_rules! py_shared_iterator {
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85 (
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86 $name: ident,
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87 $leaked: ty,
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88 $success_func: expr,
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89 $success_type: ty
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90 ) => {
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91 py_class!(pub class $name |py| {
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92 data inner: RefCell<$leaked>;
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93
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94 def __next__(&self) -> PyResult<$success_type> {
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95 let mut leaked = self.inner(py).borrow_mut();
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96 let mut iter = unsafe { leaked.try_borrow_mut(py)? };
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97 match iter.next() {
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98 None => Ok(None),
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99 // res may be a reference of cheated 'static lifetime
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100 Some(res) => $success_func(py, res),
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101 }
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102 }
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103
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104 def __iter__(&self) -> PyResult<Self> {
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105 Ok(self.clone_ref(py))
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106 }
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107 });
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108
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109 impl $name {
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110 pub fn from_inner(
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111 py: Python,
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112 leaked: $leaked,
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113 ) -> PyResult<Self> {
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114 Self::create_instance(
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115 py,
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116 RefCell::new(leaked),
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117 )
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118 }
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119 }
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120 };
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121 }