1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
|
// Regression test for #53789.
//
// check-pass
use std::cmp::Ord;
use std::collections::BTreeMap;
use std::ops::Range;
macro_rules! valuetree {
() => {
type ValueTree = <Self::Strategy as $crate::Strategy>::Value;
};
}
macro_rules! product_unpack {
($factor: pat) => {
($factor,)
};
($($factor: pat),*) => {
( $( $factor ),* )
};
($($factor: pat),*,) => {
( $( $factor ),* )
};
}
macro_rules! product_type {
($factor: ty) => {
($factor,)
};
($($factor: ty),*) => {
( $( $factor, )* )
};
($($factor: ty),*,) => {
( $( $factor, )* )
};
}
macro_rules! default {
($type: ty, $val: expr) => {
impl Default for $type {
fn default() -> Self {
$val.into()
}
}
};
}
// Pervasive internal sugar
macro_rules! mapfn {
($(#[$meta:meta])* [$($vis:tt)*]
fn $name:ident[$($gen:tt)*]($parm:ident: $input:ty) -> $output:ty {
$($body:tt)*
}) => {
$(#[$meta])*
#[derive(Clone, Copy)]
$($vis)* struct $name;
impl $($gen)* statics::MapFn<$input> for $name {
type Output = $output;
}
}
}
macro_rules! opaque_strategy_wrapper {
($(#[$smeta:meta])* pub struct $stratname:ident
[$($sgen:tt)*][$($swhere:tt)*]
($innerstrat:ty) -> $stratvtty:ty;
$(#[$vmeta:meta])* pub struct $vtname:ident
[$($vgen:tt)*][$($vwhere:tt)*]
($innervt:ty) -> $actualty:ty;
) => {
$(#[$smeta])* struct $stratname $($sgen)* (std::marker::PhantomData<(K, V)>)
$($swhere)*;
$(#[$vmeta])* struct $vtname $($vgen)* ($innervt) $($vwhere)*;
impl $($sgen)* Strategy for $stratname $($sgen)* $($swhere)* {
type Value = $stratvtty;
}
impl $($vgen)* ValueTree for $vtname $($vgen)* $($vwhere)* {
type Value = $actualty;
}
}
}
trait ValueTree {
type Value;
}
trait Strategy {
type Value: ValueTree;
}
#[derive(Clone)]
struct VecStrategy<T: Strategy> {
element: T,
size: Range<usize>,
}
fn vec<T: Strategy>(element: T, size: Range<usize>) -> VecStrategy<T> {
VecStrategy { element: element, size: size }
}
type ValueFor<S> = <<S as Strategy>::Value as ValueTree>::Value;
trait Arbitrary<'a>: Sized {
fn arbitrary_with(args: Self::Parameters) -> Self::Strategy;
type Parameters: Default;
type Strategy: Strategy<Value = Self::ValueTree>;
type ValueTree: ValueTree<Value = Self>;
}
type StrategyFor<A> = StrategyType<'static, A>;
type StrategyType<'a, A> = <A as Arbitrary<'a>>::Strategy;
//#[derive(Clone, PartialEq, Eq, Hash, Debug, From, Into)]
struct SizeBounds(Range<usize>);
default!(SizeBounds, 0..100);
impl From<Range<usize>> for SizeBounds {
fn from(high: Range<usize>) -> Self {
unimplemented!()
}
}
impl From<SizeBounds> for Range<usize> {
fn from(high: SizeBounds) -> Self {
unimplemented!()
}
}
fn any_with<'a, A: Arbitrary<'a>>(args: A::Parameters) -> StrategyType<'a, A> {
unimplemented!()
}
impl<K: ValueTree, V: ValueTree> Strategy for (K, V)
where
<K as ValueTree>::Value: Ord,
{
type Value = TupleValueTree<(K, V)>;
}
impl<K: ValueTree, V: ValueTree> ValueTree for TupleValueTree<(K, V)>
where
<K as ValueTree>::Value: Ord,
{
type Value = BTreeMapValueTree<K, V>;
}
#[derive(Clone)]
struct VecValueTree<T: ValueTree> {
elements: Vec<T>,
}
#[derive(Clone, Copy)]
struct TupleValueTree<T> {
tree: T,
}
opaque_strategy_wrapper! {
#[derive(Clone)]
pub struct BTreeMapStrategy[<K, V>]
[where K : Strategy, V : Strategy, ValueFor<K> : Ord](
statics::Filter<statics::Map<VecStrategy<(K,V)>,
VecToBTreeMap>, MinSize>)
-> BTreeMapValueTree<K::Value, V::Value>;
#[derive(Clone)]
pub struct BTreeMapValueTree[<K, V>]
[where K : ValueTree, V : ValueTree, K::Value : Ord](
statics::Filter<statics::Map<VecValueTree<TupleValueTree<(K, V)>>,
VecToBTreeMap>, MinSize>)
-> BTreeMap<K::Value, V::Value>;
}
type RangedParams2<A, B> = product_type![SizeBounds, A, B];
impl<'a, A, B> Arbitrary<'a> for BTreeMap<A, B>
where
A: Arbitrary<'static> + Ord,
B: Arbitrary<'static>,
StrategyFor<A>: 'static,
StrategyFor<B>: 'static,
{
valuetree!();
type Parameters = RangedParams2<A::Parameters, B::Parameters>;
type Strategy = BTreeMapStrategy<A::Strategy, B::Strategy>;
fn arbitrary_with(args: Self::Parameters) -> Self::Strategy {
let product_unpack![range, a, b] = args;
btree_map(any_with::<A>(a), any_with::<B>(b), range.into())
}
}
#[derive(Clone, Copy)]
struct MinSize(usize);
mapfn! {
[] fn VecToBTreeMap[<K : Ord, V>]
(vec: Vec<(K, V)>) -> BTreeMap<K, V>
{
vec.into_iter().collect()
}
}
fn btree_map<K: Strategy + 'static, V: Strategy + 'static>(
key: K,
value: V,
size: Range<usize>,
) -> BTreeMapStrategy<K, V>
where
ValueFor<K>: Ord,
{
unimplemented!()
}
mod statics {
pub(super) trait MapFn<T> {
type Output;
}
#[derive(Clone)]
pub struct Filter<S, F> {
source: S,
fun: F,
}
impl<S, F> Filter<S, F> {
pub fn new(source: S, whence: String, filter: F) -> Self {
unimplemented!()
}
}
#[derive(Clone)]
pub struct Map<S, F> {
source: S,
fun: F,
}
impl<S, F> Map<S, F> {
pub fn new(source: S, fun: F) -> Self {
unimplemented!()
}
}
}
fn main() {}
|
