FazBrowse GitHub Viewer
|
Trending
|
URL:
|
Home
Tools:
[Download Repo ZIP]
[View Raw Code]
[Original HTTPS Page]
sqlparser/tracked_buffer.go at master · dearcode/sqlparser · GitHub
Uh oh!
There was an error while loading.
Please reload this page
.
dearcode
/
sqlparser
Public
Notifications
You must be signed in to change notification settings
Fork
4
Star
4
Code
Issues
0
Pull requests
0
Actions
Projects
Security and quality
0
Insights
Additional navigation options
Code
Issues
Pull requests
Actions
Projects
Security and quality
Insights
Expand file tree
Breadcrumbs
sqlparser
/
tracked_buffer.go
Copy path
More file actions
More file actions
Latest commit
History
History
History
140 lines (126 loc) · 3.94 KB
Breadcrumbs
sqlparser
/
tracked_buffer.go
Copy path
File metadata and controls
140 lines (126 loc) · 3.94 KB
Raw
Copy raw file
Download raw file
Open symbols panel
Edit and raw actions
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
/*
Copyright 2017 Google 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
sqlparser
import
(
"bytes"
"fmt"
)
// NodeFormatter defines the signature of a custom node formatter
// function that can be given to TrackedBuffer for code generation.
type
NodeFormatter
func
(
buf
*
TrackedBuffer
,
node
SQLNode
)
// TrackedBuffer is used to rebuild a query from the ast.
// bindLocations keeps track of locations in the buffer that
// use bind variables for efficient future substitutions.
// nodeFormatter is the formatting function the buffer will
// use to format a node. By default(nil), it's FormatNode.
// But you can supply a different formatting function if you
// want to generate a query that's different from the default.
type
TrackedBuffer
struct
{
*
bytes.
Buffer
bindLocations
[]
bindLocation
nodeFormatter
NodeFormatter
}
// NewTrackedBuffer creates a new TrackedBuffer.
func
NewTrackedBuffer
(
nodeFormatter
NodeFormatter
)
*
TrackedBuffer
{
return
&
TrackedBuffer
{
Buffer
:
new
(bytes.
Buffer
),
nodeFormatter
:
nodeFormatter
,
}
}
// WriteNode function, initiates the writing of a single SQLNode tree by passing
// through to Myprintf with a default format string
func
(
buf
*
TrackedBuffer
)
WriteNode
(
node
SQLNode
)
*
TrackedBuffer
{
buf
.
Myprintf
(
"%v"
,
node
)
return
buf
}
// Myprintf mimics fmt.Fprintf(buf, ...), but limited to Node(%v),
// Node.Value(%s) and string(%s). It also allows a %a for a value argument, in
// which case it adds tracking info for future substitutions.
//
// The name must be something other than the usual Printf() to avoid "go vet"
// warnings due to our custom format specifiers.
func
(
buf
*
TrackedBuffer
)
Myprintf
(
format
string
,
values
...
interface
{}) {
end
:=
len
(
format
)
fieldnum
:=
0
for
i
:=
0
;
i
<
end
; {
lasti
:=
i
for
i
<
end
&&
format
[
i
]
!=
'%'
{
i
++
}
if
i
>
lasti
{
buf
.
WriteString
(
format
[
lasti
:
i
])
}
if
i
>=
end
{
break
}
i
++
// '%'
switch
format
[
i
] {
case
'c'
:
switch
v
:=
values
[
fieldnum
].(
type
) {
case
byte
:
buf
.
WriteByte
(
v
)
case
rune
:
buf
.
WriteRune
(
v
)
default
:
panic
(
fmt
.
Sprintf
(
"unexpected TrackedBuffer type %T"
,
v
))
}
case
's'
:
switch
v
:=
values
[
fieldnum
].(
type
) {
case
[]
byte
:
buf
.
Write
(
v
)
case
string
:
buf
.
WriteString
(
v
)
default
:
panic
(
fmt
.
Sprintf
(
"unexpected TrackedBuffer type %T"
,
v
))
}
case
'v'
:
node
:=
values
[
fieldnum
].(
SQLNode
)
if
buf
.
nodeFormatter
==
nil
{
node
.
Format
(
buf
)
}
else
{
buf
.
nodeFormatter
(
buf
,
node
)
}
case
'a'
:
buf
.
WriteArg
(
values
[
fieldnum
].(
string
))
default
:
panic
(
"unexpected"
)
}
fieldnum
++
i
++
}
}
// WriteArg writes a value argument into the buffer along with
// tracking information for future substitutions. arg must contain
// the ":" or "::" prefix.
func
(
buf
*
TrackedBuffer
)
WriteArg
(
arg
string
) {
buf
.
bindLocations
=
append
(
buf
.
bindLocations
,
bindLocation
{
offset
:
buf
.
Len
(),
length
:
len
(
arg
),
})
buf
.
WriteString
(
arg
)
}
// ParsedQuery returns a ParsedQuery that contains bind
// locations for easy substitution.
func
(
buf
*
TrackedBuffer
)
ParsedQuery
()
*
ParsedQuery
{
return
&
ParsedQuery
{
Query
:
buf
.
String
(),
bindLocations
:
buf
.
bindLocations
}
}
// HasBindVars returns true if the parsed query uses bind vars.
func
(
buf
*
TrackedBuffer
)
HasBindVars
()
bool
{
return
len
(
buf
.
bindLocations
)
!=
0
}
// BuildParsedQuery builds a ParsedQuery from the input.
func
BuildParsedQuery
(
in
string
,
vars
...
interface
{})
*
ParsedQuery
{
buf
:=
NewTrackedBuffer
(
nil
)
buf
.
Myprintf
(
in
,
vars
...
)
return
buf
.
ParsedQuery
()
}
Back
|
FazBrowse Home
|
New Git URL