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
|
package env
import (
"errors"
"regexp"
"sort"
"sync"
)
type env struct {
m map[string]string
sync.Mutex
}
type Env struct {
*env
}
const namePattern = "[a-zA-Z][a-zA-Z0-9.]*"
var isNamePattern = regexp.MustCompile("^" + namePattern + "$").MatchString
var namePatternRe = regexp.MustCompile("@(" + namePattern + "|{" + namePattern + "})")
var errBadVariable = errors.New("bad variable name")
func New() Env {
return Env{new(env)}
}
func (e *env) init() {
if e.m == nil {
e.m = make(map[string]string)
}
}
func (e *env) Copy() Env {
c := New()
if len(e.m) > 0 {
c.init()
for k, v := range e.m {
c.m[k] = v
}
}
return c
}
func (e *env) Find(key string) (string, bool) {
e.Lock()
defer e.Unlock()
v, ok := e.m[key]
return v, ok
}
func (e *env) Get(key string) string {
v, _ := e.Find(key)
return v
}
func (e *env) Set(key string, value string) error {
if !isNamePattern(key) {
return errBadVariable
}
e.Lock()
defer e.Unlock()
e.init()
e.m[key] = value
return nil
}
func (e *env) Del(key string) bool {
e.Lock()
defer e.Unlock()
if e.m == nil {
return false
}
if _, ok := e.m[key]; !ok {
return false
}
delete(e.m, key)
return true
}
func (e *env) Each(f func(string, string) bool) {
var keys []string
e.Lock()
defer e.Unlock()
for k := range e.m {
keys = append(keys, k)
}
sort.Strings(keys)
for _, k := range keys {
if !f(k, e.m[k]) {
break
}
}
}
func (e *env) Clear() {
e.Lock()
defer e.Unlock()
e.m = nil
}
func (e *env) Eval(s string) string {
e.Lock()
defer e.Unlock()
repl := func(v string) string {
key := v[1:]
if key[0] == '{' {
key = key[1 : len(key)-1]
}
if v, ok := e.m[key]; ok {
return v
}
return ""
}
for {
if t := namePatternRe.ReplaceAllStringFunc(s, repl); t == s {
break
} else {
s = t
}
}
return s
}
|
