/
unset.go
112 lines (92 loc) · 2.61 KB
/
unset.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
// Copyright (c) 2015-2016 Couchbase, Inc.
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
// except in compliance with the License. You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software distributed under the
// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
// either express or implied. See the License for the specific language governing permissions
// and limitations under the License.
package command
import (
"io"
"strings"
"github.com/couchbase/query/errors"
go_n1ql "github.com/couchbaselabs/go_n1ql"
)
/* Unset Command */
type Unset struct {
ShellCommand
}
func (this *Unset) Name() string {
return "UNSET"
}
func (this *Unset) CommandCompletion() bool {
return false
}
func (this *Unset) MinArgs() int {
return 1
}
func (this *Unset) MaxArgs() int {
return 1
}
func (this *Unset) ExecCommand(args []string) (int, string) {
/* Command to Unset the value of the given parameter.
*/
if len(args) > this.MaxArgs() {
return errors.TOO_MANY_ARGS, ""
} else if len(args) < this.MinArgs() {
return errors.TOO_FEW_ARGS, ""
} else {
//Check what kind of parameter needs to be Unset.
// For query parameters
if strings.HasPrefix(args[0], "-$") {
// For Named Parameters
vble := args[0]
vble = vble[2:]
err_code, err_str := PopValue_Helper(true, NamedParam, vble)
if err_code != 0 {
return err_code, err_str
}
go_n1ql.UnsetQueryParams(vble)
} else if strings.HasPrefix(args[0], "-") {
// For query parameters
vble := args[0]
vble = vble[1:]
err_code, err_str := PopValue_Helper(true, QueryParam, vble)
if err_code != 0 {
return err_code, err_str
}
go_n1ql.UnsetQueryParams(vble)
} else if strings.HasPrefix(args[0], "$") {
// For User defined session variables
vble := args[0]
vble = vble[1:]
err_code, err_str := PopValue_Helper(true, UserDefSV, vble)
if err_code != 0 {
return err_code, err_str
}
} else {
// For Predefined session variables
vble := args[0]
err_code, err_str := PopValue_Helper(true, PreDefSV, vble)
if err_code != 0 {
return err_code, err_str
}
}
}
return 0, ""
}
func (this *Unset) PrintHelp(desc bool) (int, string) {
_, werr := io.WriteString(W, "\\UNSET <parameter>\n")
if desc {
err_code, err_str := printDesc(this.Name())
if err_code != 0 {
return err_code, err_str
}
}
_, werr = io.WriteString(W, "\n")
if werr != nil {
return errors.WRITER_OUTPUT, werr.Error()
}
return 0, ""
}