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
use errors::Result;
use std::fmt;
use {Object, RpPackage, RpRequiredPackage, Version};
#[derive(Debug)]
pub struct Resolved {
pub version: Option<Version>,
pub object: Box<Object>,
}
#[derive(Debug)]
pub struct ResolvedByPrefix {
pub package: RpPackage,
pub object: Box<Object>,
}
impl Resolved {
pub fn from_pair(pair: (Option<Version>, Box<Object>)) -> Resolved {
let (version, object) = pair;
Resolved {
version: version,
object: object,
}
}
}
impl fmt::Display for Resolved {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
if let Some(ref version) = self.version {
write!(fmt, "{}-{}", self.object, version)
} else {
self.object.fmt(fmt)
}
}
}
pub trait Resolver {
fn resolve(&mut self, package: &RpRequiredPackage) -> Result<Vec<Resolved>>;
fn resolve_by_prefix(&mut self, package: &RpPackage) -> Result<Vec<ResolvedByPrefix>>;
}
pub struct EmptyResolver;
impl Resolver for EmptyResolver {
fn resolve(&mut self, _package: &RpRequiredPackage) -> Result<Vec<Resolved>> {
Ok(vec![])
}
fn resolve_by_prefix(&mut self, _package: &RpPackage) -> Result<Vec<ResolvedByPrefix>> {
Ok(vec![])
}
}