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
|
// Copyright ©2017 The Gonum Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package encoding
import "gonum.org/v1/gonum/graph"
// Builder is a graph that can have user-defined nodes and edges added.
type Builder interface {
graph.Graph
graph.Builder
}
// MultiBuilder is a graph that can have user-defined nodes and edges added.
type MultiBuilder interface {
graph.Multigraph
graph.MultigraphBuilder
}
// AttributeSetter is implemented by types that can set an encoded graph
// attribute.
type AttributeSetter interface {
SetAttribute(Attribute) error
}
// Attributer defines graph.Node or graph.Edge values that can
// specify graph attributes.
type Attributer interface {
Attributes() []Attribute
}
// Attribute is an encoded key value attribute pair use in graph encoding.
type Attribute struct {
Key, Value string
}
// Attributes is a helper type providing simple attribute handling.
type Attributes []Attribute
// Attributes returns all of the receiver's attributes.
func (a *Attributes) Attributes() []Attribute {
return *a
}
// SetAttribute sets attr in the receiver. Calling SetAttribute with an
// Attribute with a Key that is in the collection replaces the existing
// value and calling with an empty Value removes the attribute from the
// collection if it exists. SetAttribute always returns nil.
func (a *Attributes) SetAttribute(attr Attribute) error {
if attr.Key == "" {
return nil
}
for i, v := range *a {
if v.Key == attr.Key {
if attr.Value == "" {
(*a)[i] = (*a)[len(*a)-1]
*a = (*a)[:len(*a)-1]
return nil
}
(*a)[i].Value = attr.Value
return nil
}
}
if attr.Value != "" {
*a = append(*a, attr)
}
return nil
}
|
