/
writer.go
172 lines (144 loc) · 3.43 KB
/
writer.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
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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
package cmdutils
import (
"bytes"
"fmt"
"io"
"strings"
)
type SequenceDiagramWriter struct {
Ind int
AtBeginOfLine bool
AutogenWarning bool
Active map[string]int
Properties []string
Head bytes.Buffer
Body bytes.Buffer
}
func MakeSequenceDiagramWriter(autogenWarning bool, properties ...string) *SequenceDiagramWriter {
p := make([]string, 0, len(properties))
p = append(p, properties...)
return &SequenceDiagramWriter{
AtBeginOfLine: true,
AutogenWarning: autogenWarning,
Properties: p,
Active: map[string]int{},
}
}
func (s *SequenceDiagramWriter) WriteTo(w io.Writer) (n int64, err error) {
i, err := fmt.Fprint(w, s.String())
return int64(i), err
}
func (s *SequenceDiagramWriter) Write(p []byte) (n int, err error) {
newline := []byte("\n")
newlines := bytes.Count(p, newline)
if newlines == 0 {
if s.AtBeginOfLine {
s.WriteIndent()
}
n, err = s.Body.Write(p)
if err == nil {
s.AtBeginOfLine = false
}
return n, err
}
frags := bytes.SplitN(p, newline, newlines+1)
for i, frag := range frags {
if s.AtBeginOfLine && len(frag) != 0 {
s.WriteIndent()
}
nn, err := s.Body.Write(frag)
if err != nil {
return n, err
}
s.AtBeginOfLine = false
n += nn
if i+1 < len(frags) {
if err := s.WriteByte('\n'); err != nil {
return n, err
}
n++
}
}
s.AtBeginOfLine = len(frags[len(frags)-1]) == 0
return n, nil
}
func (s *SequenceDiagramWriter) WriteString(v string) (n int, err error) {
return s.Write([]byte(v))
}
func (s *SequenceDiagramWriter) WriteByte(c byte) error {
if s.AtBeginOfLine {
s.WriteIndent()
}
err := s.Body.WriteByte(c)
if err == nil {
s.AtBeginOfLine = c == '\n'
}
return err
}
func (s *SequenceDiagramWriter) WriteHead(v string) (int, error) {
return fmt.Fprintln(&s.Head, v)
}
func (s *SequenceDiagramWriter) Indent() {
s.Ind++
}
func (s *SequenceDiagramWriter) Unindent() {
if s.Ind == 0 {
panic("SequenceDiagramWriter unindent too far")
}
s.Ind--
}
func (s *SequenceDiagramWriter) Activate(agent string) {
s.Active[agent]++
fmt.Fprintf(s, "activate %s\n", agent)
}
func (s *SequenceDiagramWriter) Activated(agent string, suppressed bool) func() {
if !suppressed {
s.Activate(agent)
}
active := !suppressed
return func() {
if active {
active = false
s.Deactivate(agent)
}
}
}
func (s *SequenceDiagramWriter) Deactivate(agent string) {
if v, ok := s.Active[agent]; !ok || v == 0 {
return
}
s.Active[agent]--
fmt.Fprintf(s, "deactivate %s\n", agent)
if s.Active[agent] == 0 {
delete(s.Active, agent)
}
}
func (s *SequenceDiagramWriter) WriteIndent() {
if !s.AtBeginOfLine {
return
}
s.Body.WriteString(strings.Repeat(" ", s.Ind))
s.AtBeginOfLine = false
}
func (s *SequenceDiagramWriter) String() string {
if s.Body.Len() == 0 || s.Head.Len() == 0 {
return ""
}
var sb strings.Builder
if s.AutogenWarning {
fmt.Fprintln(&sb, "''''''''''''''''''''''''''''''''''''''''''")
fmt.Fprintln(&sb, "'' ''")
fmt.Fprintln(&sb, "'' AUTOGENERATED CODE -- DO NOT EDIT! ''")
fmt.Fprintln(&sb, "'' ''")
fmt.Fprintln(&sb, "''''''''''''''''''''''''''''''''''''''''''")
fmt.Fprintln(&sb)
}
fmt.Fprintln(&sb, "@startuml")
sb.WriteString(s.Head.String())
for _, p := range s.Properties {
fmt.Fprintln(&sb, p)
}
sb.WriteString(s.Body.String())
fmt.Fprintln(&sb, "@enduml")
return sb.String()
}