FazBrowse GitHub Viewer
|
Trending
|
URL:
|
Home
Tools:
[Download Repo ZIP]
[View Raw Code]
[Original HTTPS Page]
gpython/parser/stringescape.go at v0.0.3 · go-python/gpython · GitHub
Uh oh!
There was an error while loading.
Please reload this page
.
go-python
/
gpython
Public
Notifications
You must be signed in to change notification settings
Fork
105
Star
1k
Code
Issues
49
Pull requests
5
Actions
Projects
Wiki
Security and quality
0
Insights
Additional navigation options
Code
Issues
Pull requests
Actions
Projects
Wiki
Security and quality
Insights
Expand file tree
Breadcrumbs
gpython
/
parser
/
stringescape.go
Copy path
More file actions
More file actions
Latest commit
History
History
History
148 lines (143 loc) · 3.38 KB
Breadcrumbs
gpython
/
parser
/
stringescape.go
Copy path
File metadata and controls
148 lines (143 loc) · 3.38 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
141
142
143
144
145
146
147
148
// Copyright 2018 The go-python Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package
parser
import
(
"bytes"
"strconv"
"github.com/go-python/gpython/py"
)
// DecodeEscape unescapes a backslash-escaped buffer
//
// byteMode indicates whether we are creating a unicode string or a bytes output
func
DecodeEscape
(
in
*
bytes.
Buffer
,
byteMode
bool
) (
out
*
bytes.
Buffer
,
err
error
) {
// Early exit if no escape sequences
// NB in.Bytes() is cheap
inBytes
:=
in
.
Bytes
()
if
bytes
.
IndexRune
(
inBytes
,
'\\'
)
<
0
{
return
in
,
nil
}
out
=
new
(bytes.
Buffer
)
runes
:=
bytes
.
Runes
(
inBytes
)
decodeHex
:=
func
(
what
byte
,
i
,
size
int
)
error
{
i
++
if
i
+
size
<=
len
(
runes
) {
cout
,
err
:=
strconv
.
ParseInt
(
string
(
runes
[
i
:
i
+
size
]),
16
,
32
)
if
err
!=
nil
{
return
py
.
ExceptionNewf
(
py
.
ValueError
,
"invalid
\\
%c escape at position %d"
,
what
,
i
-
2
)
}
if
byteMode
{
out
.
WriteByte
(
byte
(
cout
))
}
else
{
out
.
WriteRune
(
rune
(
cout
))
}
}
else
{
return
py
.
ExceptionNewf
(
py
.
ValueError
,
"truncated
\\
%c escape at position %d"
,
what
,
i
-
2
)
}
return
nil
}
ignoreEscape
:=
false
for
i
:=
0
;
i
<
len
(
runes
);
i
++
{
c
:=
runes
[
i
]
if
c
!=
'\\'
{
out
.
WriteRune
(
c
)
continue
}
i
++
if
i
>=
len
(
runes
) {
return
nil
,
py
.
ExceptionNewf
(
py
.
ValueError
,
"Trailing
\\
in string"
)
}
c
=
runes
[
i
]
switch
c
{
case
'\n'
:
case
'\\'
:
out
.
WriteRune
(
'\\'
)
case
'\''
:
out
.
WriteRune
(
'\''
)
case
'"'
:
out
.
WriteRune
(
'"'
)
case
'b'
:
out
.
WriteRune
(
'\b'
)
case
'f'
:
out
.
WriteRune
(
'\014'
)
// FF
case
't'
:
out
.
WriteRune
(
'\t'
)
case
'n'
:
out
.
WriteRune
(
'\n'
)
case
'r'
:
out
.
WriteRune
(
'\r'
)
case
'v'
:
out
.
WriteRune
(
'\013'
)
// VT
case
'a'
:
out
.
WriteRune
(
'\007'
)
// BEL, not classic C
case
'0'
,
'1'
,
'2'
,
'3'
,
'4'
,
'5'
,
'6'
,
'7'
:
// 1 to 3 characters of octal escape
cout
:=
c
-
'0'
if
i
+
1
<
len
(
runes
)
&&
'0'
<=
runes
[
i
+
1
]
&&
runes
[
i
+
1
]
<=
'7'
{
i
++
cout
=
(
cout
<<
3
)
+
runes
[
i
]
-
'0'
if
i
+
1
<
len
(
runes
)
&&
'0'
<=
runes
[
i
+
1
]
&&
runes
[
i
+
1
]
<=
'7'
{
i
++
cout
=
(
cout
<<
3
)
+
runes
[
i
]
-
'0'
}
}
if
byteMode
{
out
.
WriteByte
(
byte
(
cout
))
}
else
{
out
.
WriteRune
(
cout
)
}
case
'x'
:
// \xhh exactly 2 characters of hex
err
=
decodeHex
(
'x'
,
i
,
2
)
if
err
!=
nil
{
return
nil
,
err
}
i
+=
2
// FIXME In a bytes literal, hexadecimal and
// octal escapes denote the byte with the
// given value. In a string literal, these
// escapes denote a Unicode character with the
// given value.
case
'u'
:
// \uxxxx Character with 16-bit hex value xxxx - 4 characters required
if
byteMode
{
ignoreEscape
=
true
break
}
err
=
decodeHex
(
'u'
,
i
,
4
)
if
err
!=
nil
{
return
nil
,
err
}
i
+=
4
case
'U'
:
// \Uxxxxxxxx Character with 32-bit hex value xxxxxxxx - 8 characters required
if
byteMode
{
ignoreEscape
=
true
break
}
err
=
decodeHex
(
'U'
,
i
,
8
)
if
err
!=
nil
{
return
nil
,
err
}
i
+=
8
case
'N'
:
// \N{name} Character named name in the Unicode database
if
byteMode
{
ignoreEscape
=
true
break
}
// FIXME go can't do this as builtin so ignore for the moment
ignoreEscape
=
true
default
:
ignoreEscape
=
true
break
}
// ignore unrecognised escape
if
ignoreEscape
{
i
--
out
.
WriteRune
(
'\\'
)
ignoreEscape
=
false
}
}
return
out
,
nil
}
Back
|
FazBrowse Home
|
New Git URL