willow25 0.5.0-alpha.1

A ready-to-use implementation of the Willow specifications.
Documentation 
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

//! Non-empty [groupings](https://willowprotocol.org/specs/grouping-entries/) of entries in 3d space.
//!
//! This module implements the [groupings](https://willowprotocol.org/specs/grouping-entries/) used by the Willow specifications:
//!
//! - [ranges](https://willowprotocol.org/specs/grouping-entries/#ranges) ([`WillowRange`]),
//! - [3d ranges](https://willowprotocol.org/specs/grouping-entries/#D3Range) ([`Range3d`]),
//! - [areas](https://willowprotocol.org/specs/grouping-entries/#areas) ([`Area`]), and
//! - [areas of interest](https://willowprotocol.org/specs/grouping-entries/#aois) ([`AreaOfInterest`]).
//!
//! Our implementations center around two traits: [`Coordinatelike`] describes values which fall into some position in three-dimensional Willow space, and [`Grouping`] describes some non-empty region of that space. The [`CoordinatelikeExt`] trait then provides convenient methods for checking which values are included in which groupings.
//!
//! ```
//! use willow25::prelude::*;
//!
//! let entry = Entry::builder()
//!     .namespace_id([0; 32].into())
//!     .subspace_id([1; 32].into())
//!     .path(path!("/vacation/plan"))
//!     .timestamp(12345)
//!     .payload_digest([77; 32].into())
//!     .payload_length(17)
//!     .build();
//!
//! assert!(entry.is_in(&Range3d::full()));
//! ```

use core::ops::RangeBounds;

use willow_data_model as wdm;

use crate::prelude::*;

pub use wdm::groupings::WillowRange;

mod keylike;
pub use keylike::*;

mod coordinatelike;
pub use coordinatelike::*;

mod namespaced;
pub use namespaced::*;

mod range_3d;
pub use range_3d::*;

mod area;
pub use area::*;

mod area_of_interest;
pub use area_of_interest::*;

pub mod private_context;

/// A [`WillowRange`] of [SubspaceIds](https://willowprotocol.org/specs/data-model/index.html#SubspaceId).
///
/// [Specification](https://willowprotocol.org/specs/grouping-entries/index.html#SubspaceRange)
pub type SubspaceRange = WillowRange<SubspaceId>;

/// A [`WillowRange`] of [Paths](https://willowprotocol.org/specs/data-model/index.html#Path).
///
/// [Specification](https://willowprotocol.org/specs/grouping-entries/index.html#PathRange)
pub type PathRange = WillowRange<Path>;

/// A [`WillowRange`] of [Timestamps](https://willowprotocol.org/specs/data-model/index.html#Timestamp).
///
/// [Specification](https://willowprotocol.org/specs/grouping-entries/index.html#TimeRange)
pub type TimeRange = wdm::groupings::TimeRange;

/// A grouping of entries.
///
/// A grouping describes a non-empty set of [`Coordinatelike`] values, with [`Grouping::includes`] providing the membership test. Groupings must implement [`PartialOrd`] as the subset relation.
pub trait Grouping: PartialOrd + Sized {
    /// Returns `true` iff the given [`Coordinatelike`] value is included in this grouping.
    fn includes<Coord>(&self, coord: &Coord) -> bool
    where
        Coord: Coordinatelike + ?Sized;

    /// Returns `true` iff every value [included](Grouping::includes) in `other` is also [included](Grouping::includes) in `self`.
    fn includes_grouping(&self, other: &Self) -> bool {
        self >= other
    }

    /// Returns `true` iff every value [included](Grouping::includes) in `other` is also [included](Grouping::includes) in `self` *and* `self` and `other` are not equal.
    fn strictly_includes_grouping(&self, other: &Self) -> bool {
        self > other
    }

    /// Returns a grouping which [includes](Grouping::includes) exactly those values [included](Grouping::includes) by both `self` and `other`.
    fn intersection(&self, other: &Self) -> Result<Self, wdm::prelude::EmptyGrouping>;

    /// Returns `true` iff the given [`Coordinatelike`] value is [included](Grouping::includes) in the [intersection](Grouping::intersection) of `self` and `other`.
    fn includes_in_intersection<Coord>(&self, other: &Self, coord: &Coord) -> bool
    where
        Coord: Coordinatelike + ?Sized,
    {
        self.includes(coord) && other.includes(coord)
    }
}

impl Grouping for WillowRange<SubspaceId> {
    fn includes<Coord>(&self, coord: &Coord) -> bool
    where
        Coord: Coordinatelike + ?Sized,
    {
        self.contains(coord.subspace_id())
    }

    fn intersection(&self, other: &Self) -> Result<Self, wdm::prelude::EmptyGrouping> {
        self.intersection_willow_range(other)
    }
}

impl Grouping for WillowRange<Path> {
    fn includes<Coord>(&self, coord: &Coord) -> bool
    where
        Coord: Coordinatelike + ?Sized,
    {
        self.contains(coord.path())
    }

    fn intersection(&self, other: &Self) -> Result<Self, wdm::prelude::EmptyGrouping> {
        self.intersection_willow_range(other)
    }
}

impl Grouping for WillowRange<Timestamp> {
    fn includes<Coord>(&self, coord: &Coord) -> bool
    where
        Coord: Coordinatelike + ?Sized,
    {
        self.contains(&coord.timestamp())
    }

    fn intersection(&self, other: &Self) -> Result<Self, wdm::prelude::EmptyGrouping> {
        self.intersection_willow_range(other)
    }
}