-
Notifications
You must be signed in to change notification settings - Fork 139
/
fieldmatcher.go
67 lines (56 loc) · 1.82 KB
/
fieldmatcher.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
package q
import (
"errors"
"go/token"
"reflect"
)
// ErrUnknownField is returned when an unknown field is passed.
var ErrUnknownField = errors.New("unknown field")
type fieldMatcherDelegate struct {
FieldMatcher
Field string
}
// NewFieldMatcher creates a Matcher for a given field.
func NewFieldMatcher(field string, fm FieldMatcher) Matcher {
return fieldMatcherDelegate{Field: field, FieldMatcher: fm}
}
// FieldMatcher can be used in NewFieldMatcher as a simple way to create the
// most common Matcher: A Matcher that evaluates one field's value.
// For more complex scenarios, implement the Matcher interface directly.
type FieldMatcher interface {
MatchField(v interface{}) (bool, error)
}
func (r fieldMatcherDelegate) Match(i interface{}) (bool, error) {
v := reflect.Indirect(reflect.ValueOf(i))
return r.MatchValue(&v)
}
func (r fieldMatcherDelegate) MatchValue(v *reflect.Value) (bool, error) {
field := v.FieldByName(r.Field)
if !field.IsValid() {
return false, ErrUnknownField
}
return r.MatchField(field.Interface())
}
// NewField2FieldMatcher creates a Matcher for a given field1 and field2.
func NewField2FieldMatcher(field1, field2 string, tok token.Token) Matcher {
return field2fieldMatcherDelegate{Field1: field1, Field2: field2, Tok: tok}
}
type field2fieldMatcherDelegate struct {
Field1, Field2 string
Tok token.Token
}
func (r field2fieldMatcherDelegate) Match(i interface{}) (bool, error) {
v := reflect.Indirect(reflect.ValueOf(i))
return r.MatchValue(&v)
}
func (r field2fieldMatcherDelegate) MatchValue(v *reflect.Value) (bool, error) {
field1 := v.FieldByName(r.Field1)
if !field1.IsValid() {
return false, ErrUnknownField
}
field2 := v.FieldByName(r.Field2)
if !field2.IsValid() {
return false, ErrUnknownField
}
return compare(field1.Interface(), field2.Interface(), r.Tok), nil
}