| David Tolnay | 5533772 | 2016-09-11 12:58:56 -0700 | [diff] [blame] | 1 | use { |
| 2 | Ident, |
| 3 | Lifetime, |
| 4 | LifetimeDef, |
| 5 | }; |
| 6 | use aster::invoke::{Invoke, Identity}; |
| 7 | |
| 8 | ////////////////////////////////////////////////////////////////////////////// |
| 9 | |
| 10 | pub trait IntoLifetime { |
| 11 | fn into_lifetime(self) -> Lifetime; |
| 12 | } |
| 13 | |
| 14 | impl IntoLifetime for Lifetime { |
| 15 | fn into_lifetime(self) -> Lifetime { |
| 16 | self |
| 17 | } |
| 18 | } |
| 19 | |
| 20 | impl<'a> IntoLifetime for &'a str { |
| 21 | fn into_lifetime(self) -> Lifetime { |
| 22 | Lifetime { |
| 23 | ident: self.into(), |
| 24 | } |
| 25 | } |
| 26 | } |
| 27 | |
| 28 | ////////////////////////////////////////////////////////////////////////////// |
| 29 | |
| 30 | pub trait IntoLifetimeDef { |
| 31 | fn into_lifetime_def(self) -> LifetimeDef; |
| 32 | } |
| 33 | |
| 34 | impl IntoLifetimeDef for LifetimeDef { |
| 35 | fn into_lifetime_def(self) -> LifetimeDef { |
| 36 | self |
| 37 | } |
| 38 | } |
| 39 | |
| 40 | impl IntoLifetimeDef for Lifetime { |
| 41 | fn into_lifetime_def(self) -> LifetimeDef { |
| 42 | LifetimeDef { |
| 43 | lifetime: self, |
| 44 | bounds: vec![], |
| 45 | } |
| 46 | } |
| 47 | } |
| 48 | |
| 49 | impl<'a> IntoLifetimeDef for &'a str { |
| 50 | fn into_lifetime_def(self) -> LifetimeDef { |
| 51 | self.into_lifetime().into_lifetime_def() |
| 52 | } |
| 53 | } |
| 54 | |
| 55 | impl IntoLifetimeDef for String { |
| 56 | fn into_lifetime_def(self) -> LifetimeDef { |
| 57 | (*self).into_lifetime().into_lifetime_def() |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | ////////////////////////////////////////////////////////////////////////////// |
| 62 | |
| 63 | pub struct LifetimeDefBuilder<F=Identity> { |
| 64 | callback: F, |
| 65 | lifetime: Lifetime, |
| 66 | bounds: Vec<Lifetime>, |
| 67 | } |
| 68 | |
| 69 | impl LifetimeDefBuilder { |
| 70 | pub fn new<N>(name: N) -> Self |
| 71 | where N: Into<Ident>, |
| 72 | { |
| 73 | LifetimeDefBuilder::with_callback(name, Identity) |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | impl<F> LifetimeDefBuilder<F> |
| 78 | where F: Invoke<LifetimeDef>, |
| 79 | { |
| 80 | pub fn with_callback<N>(name: N, callback: F) -> Self |
| 81 | where N: Into<Ident>, |
| 82 | { |
| 83 | let lifetime = Lifetime { |
| 84 | ident: name.into(), |
| 85 | }; |
| 86 | |
| 87 | LifetimeDefBuilder { |
| 88 | callback: callback, |
| 89 | lifetime: lifetime, |
| 90 | bounds: Vec::new(), |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | pub fn bound<N>(mut self, name: N) -> Self |
| 95 | where N: Into<Ident>, |
| 96 | { |
| 97 | let lifetime = Lifetime { |
| 98 | ident: name.into(), |
| 99 | }; |
| 100 | |
| 101 | self.bounds.push(lifetime); |
| 102 | self |
| 103 | } |
| 104 | |
| 105 | pub fn build(self) -> F::Result { |
| 106 | self.callback.invoke(LifetimeDef { |
| 107 | lifetime: self.lifetime, |
| 108 | bounds: self.bounds, |
| 109 | }) |
| 110 | } |
| 111 | } |