-
Notifications
You must be signed in to change notification settings - Fork 22
/
resolver.go
86 lines (81 loc) · 2.22 KB
/
resolver.go
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
package state
import (
"fmt"
"github.com/zond/godip"
)
type resolver struct {
*State
deps []godip.Province
guesses map[godip.Province]error
resolving map[godip.Province]bool
}
func (self *resolver) adjudicate(prov godip.Province) (err error) {
godip.Logf("Adj(%v)", prov)
godip.Indent(" ")
order, _, found := self.State.Order(prov)
if !found {
return fmt.Errorf("No order for %v found", prov)
}
err = order.(godip.Adjudicator).Adjudicate(self)
godip.DeIndent()
if err == nil {
godip.Logf("%v: Success", prov)
} else {
godip.Logf("%v: Failure: %v", prov, err)
}
return
}
func (self *resolver) Resolve(prov godip.Province) (err error) {
godip.Logf("Res(%v) (deps %v)", prov, self.deps)
godip.Indent(" ")
var ok bool
if err, ok = self.State.resolutions[prov]; !ok {
if err, ok = self.guesses[prov]; !ok {
if self.resolving[prov] {
godip.Logf("Already resolving %v, making negative guess", prov)
err = fmt.Errorf("Negative guess")
self.guesses[prov] = err
self.deps = append(self.deps, prov)
} else {
self.resolving[prov] = true
n_guesses := len(self.guesses)
err = self.adjudicate(prov)
delete(self.resolving, prov)
if _, ok = self.guesses[prov]; ok {
godip.Logf("Guess made for %v, changing guess to positive", prov)
self.guesses[prov] = nil
secondErr := self.adjudicate(prov)
delete(self.guesses, prov)
if (err == nil) != (secondErr == nil) {
godip.Logf("Calling backup rule with %v", self.deps)
if err = self.State.backupRule(self, self.deps); err != nil {
return
}
self.deps = nil
err = self.Resolve(prov)
} else {
godip.Logf("Only one consistent result, returning %+v", err)
}
} else if len(self.guesses) != n_guesses {
godip.Logf("Made new guess, adding %v to deps", prov)
self.deps = append(self.deps, prov)
}
}
} else {
godip.Logf("Guessed")
}
if len(self.guesses) == 0 {
godip.Logf("No guessing, resolving %v", prov)
self.State.resolutions[prov] = err
}
} else {
godip.Logf("Resolved")
}
godip.DeIndent()
if err == nil {
godip.Logf("%v: Success (deps %v)", prov, self.deps)
} else {
godip.Logf("%v: Failure: %v (deps %v)", prov, err, self.deps)
}
return
}