-
Notifications
You must be signed in to change notification settings - Fork 0
/
parser.go
79 lines (71 loc) · 1.51 KB
/
parser.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
package parser
import (
"fmt"
"strings"
"github.com/machinly/bitcask/engine"
)
type Parser interface {
Parse(string) ([]string, error)
}
type parser struct {
engine engine.Engine
}
func (p *parser) Parse(cmdStr string) ([]string, error) {
if cmdStr == "" {
return []string{""}, nil
}
rawCmds := strings.Split(cmdStr, " ")
cmds := make([]string, 0, len(rawCmds))
for _, rawCmd := range rawCmds {
cmd := strings.TrimSpace(rawCmd)
if cmd == "" {
continue
}
cmds = append(cmds, cmd)
}
method := cmds[0]
var args []string
if len(cmds) > 1 {
args = cmds[1:]
}
switch method {
case "put":
if len(args) != 2 {
return nil, fmt.Errorf("put command requires 2 arguments")
}
err := p.engine.Put(args[0], args[1])
if err != nil {
return nil, err
}
return []string{"ok"}, nil
case "get":
if len(args) != 1 {
return nil, fmt.Errorf("get command requires 1 argument")
}
value, err := p.engine.Get(args[0])
if err != nil {
return nil, err
}
return []string{value}, nil
case "delete":
if len(args) != 1 {
return nil, fmt.Errorf("delete command requires 1 argument")
}
err := p.engine.Delete(args[0])
if err != nil {
return nil, err
}
return []string{"ok"}, nil
case "list":
if len(args) != 0 {
return nil, fmt.Errorf("list command requires 0 arguments")
}
keys, err := p.engine.ListKeys()
return keys, err
default:
return nil, fmt.Errorf("unknown command: %s", method)
}
}
func NewParser(engine engine.Engine) Parser {
return &parser{engine: engine}
}