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
use rand::Rng; use wfc::{ForbidPattern, PropagateError, RunBorrow, RunOwn, Wave}; use wrap::Wrap; pub trait RetryOwn: private::Sealed { type Return; fn retry<'a, W, F, R>(&mut self, run: RunOwn<'a, W, F>, rng: &mut R) -> Self::Return where W: Wrap, F: ForbidPattern, R: Rng; } #[derive(Debug, Clone, Copy)] pub struct Forever; impl RetryOwn for Forever { type Return = Wave; fn retry<'a, W, F, R>( &mut self, mut run: RunOwn<'a, W, F>, rng: &mut R, ) -> Self::Return where W: Wrap, F: ForbidPattern, R: Rng, { loop { match run.collapse(rng) { Ok(()) => (), Err(PropagateError::Contradiction) => continue, } return run.into_wave(); } } } #[derive(Debug, Clone, Copy)] pub struct NumTimes(pub usize); impl RetryOwn for NumTimes { type Return = Result<Wave, PropagateError>; fn retry<'a, W, F, R>( &mut self, mut run: RunOwn<'a, W, F>, rng: &mut R, ) -> Self::Return where W: Wrap, F: ForbidPattern, R: Rng, { loop { match run.collapse(rng) { Ok(()) => return Ok(run.into_wave()), Err(e) => { if self.0 == 0 { return Err(e); } else { self.0 -= 1; } } } } } } pub trait RetryBorrow: private::Sealed { type Return; fn retry<'a, W, F, R>( &mut self, run: &mut RunBorrow<'a, W, F>, rng: &mut R, ) -> Self::Return where W: Wrap, F: ForbidPattern, R: Rng; } impl RetryBorrow for Forever { type Return = (); fn retry<'a, W, F, R>( &mut self, run: &mut RunBorrow<'a, W, F>, rng: &mut R, ) -> Self::Return where W: Wrap, F: ForbidPattern, R: Rng, { loop { match run.collapse(rng) { Ok(()) => break, Err(PropagateError::Contradiction) => continue, } } } } impl RetryBorrow for NumTimes { type Return = Result<(), PropagateError>; fn retry<'a, W, F, R>( &mut self, run: &mut RunBorrow<'a, W, F>, rng: &mut R, ) -> Self::Return where W: Wrap, F: ForbidPattern, R: Rng, { loop { match run.collapse(rng) { Ok(()) => return Ok(()), Err(e) => { if self.0 == 0 { return Err(e); } else { self.0 -= 1; } } } } } } mod private { use super::*; pub trait Sealed {} impl Sealed for Forever {} impl Sealed for NumTimes {} }