forked from go-python/gpython
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathbytes.go
More file actions
244 lines (218 loc) · 6.01 KB
/
Copy pathbytes.go
File metadata and controls
244 lines (218 loc) · 6.01 KB
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
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
// 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.
// Bytes objects
package py
import (
"bytes"
"fmt"
"strings"
)
var BytesType = ObjectType.NewType("bytes",
`bytes(iterable_of_ints) -> bytes
bytes(string, encoding[, errors]) -> bytes
bytes(bytes_or_buffer) -> immutable copy of bytes_or_buffer
bytes(int) -> bytes object of size given by the parameter initialized with null bytes
bytes() -> empty bytes object
Construct an immutable array of bytes from:
- an iterable yielding integers in range(256)
- a text string encoded using the specified encoding
- any object implementing the buffer API.
- an integer`, BytesNew, nil)
type Bytes []byte
// Type of this Bytes object
func (o Bytes) Type() *Type {
return BytesType
}
// BytesNew
func BytesNew(metatype *Type, args Tuple, kwargs StringDict) (res Object, err error) {
var x Object
var encoding Object
var errors Object
var New Object
kwlist := []string{"source", "encoding", "errors"}
err = ParseTupleAndKeywords(args, kwargs, "|Oss:bytes", kwlist, &x, &encoding, &errors)
if err != nil {
return nil, err
}
if x == nil {
if encoding != nil || errors != nil {
return nil, ExceptionNewf(TypeError, "encoding or errors without sequence argument")
}
return Bytes{}, nil
}
if s, ok := x.(String); ok {
// Encode via the codec registry
if encoding == nil {
return nil, ExceptionNewf(TypeError, "string argument without an encoding")
}
encodingStr := strings.ToLower(string(encoding.(String)))
if encodingStr == "utf-8" || encodingStr == "utf8" {
return Bytes([]byte(s)), nil
}
// FIXME
// New = PyUnicode_AsEncodedString(x, encoding, errors)
// assert(PyBytes_Check(New))
// return New
return nil, ExceptionNewf(NotImplementedError, "String decode for %q not implemented", encodingStr)
}
// We'd like to call PyObject_Bytes here, but we need to check for an
// integer argument before deferring to PyBytes_FromObject, something
// PyObject_Bytes doesn't do.
var ok bool
if I, ok := x.(I__bytes__); ok {
New, err = I.M__bytes__()
if err != nil {
return nil, err
}
} else if New, ok, err = TypeCall0(x, "__bytes__"); ok {
if err != nil {
return nil, err
}
} else {
goto no_bytes_method
}
if _, ok = New.(Bytes); !ok {
return nil, ExceptionNewf(TypeError, "__bytes__ returned non-bytes (type %s)", New.Type().Name)
}
no_bytes_method:
// Is it an integer?
_, isInt := x.(Int)
_, isBigInt := x.(*BigInt)
if isInt || isBigInt {
size, err := MakeGoInt(x)
if err != nil {
return nil, err
}
if size < 0 {
return nil, ExceptionNewf(ValueError, "negative count")
}
return make(Bytes, size), nil
}
// If it's not unicode, there can't be encoding or errors
if encoding != nil || errors != nil {
return nil, ExceptionNewf(TypeError, "encoding or errors without a string argument")
}
return BytesFromObject(x)
}
// Converts an object into bytes
func BytesFromObject(x Object) (Bytes, error) {
// Look for special cases
// FIXME implement converting from any object implementing the buffer API.
switch z := x.(type) {
case Bytes:
// Immutable type so just return what was passed in
return z, nil
case String:
return nil, ExceptionNewf(TypeError, "cannot convert unicode object to bytes")
}
// Otherwise iterate through the whatever converting it into ints
b := Bytes{}
var loopErr error
iterErr := Iterate(x, func(item Object) bool {
var value int
value, loopErr = IndexInt(item)
if loopErr != nil {
return true
}
if value < 0 || value >= 256 {
loopErr = ExceptionNewf(ValueError, "bytes must be in range(0, 256)")
return true
}
b = append(b, byte(value))
return false
})
if iterErr != nil {
return nil, iterErr
}
if loopErr != nil {
return nil, loopErr
}
return b, nil
}
func (a Bytes) M__str__() (Object, error) {
return a.M__repr__()
}
func (a Bytes) M__repr__() (Object, error) {
// FIXME combine this with parser/stringescape.go into file in py?
var out bytes.Buffer
quote := '\''
if bytes.IndexByte(a, byte('\'')) >= 0 && !(bytes.IndexByte(a, byte('"')) >= 0) {
quote = '"'
}
out.WriteRune('b')
out.WriteRune(quote)
for _, c := range a {
switch {
case c < 0x20:
switch c {
case '\t':
out.WriteString(`\t`)
case '\n':
out.WriteString(`\n`)
case '\r':
out.WriteString(`\r`)
default:
fmt.Fprintf(&out, `\x%02x`, c)
}
case c < 0x7F:
if c == '\\' || (quote == '\'' && c == '\'') || (quote == '"' && c == '"') {
out.WriteRune('\\')
}
out.WriteByte(c)
default:
fmt.Fprintf(&out, "\\x%02x", c)
}
}
out.WriteRune(quote)
return String(out.String()), nil
}
// Convert an Object to an Bytes
//
// Retrurns ok as to whether the conversion worked or not
func convertToBytes(other Object) (Bytes, bool) {
switch b := other.(type) {
case Bytes:
return b, true
}
return []byte(nil), false
}
// Rich comparison
func (a Bytes) M__lt__(other Object) (Object, error) {
if b, ok := convertToBytes(other); ok {
return NewBool(bytes.Compare(a, b) < 0), nil
}
return NotImplemented, nil
}
func (a Bytes) M__le__(other Object) (Object, error) {
if b, ok := convertToBytes(other); ok {
return NewBool(bytes.Compare(a, b) <= 0), nil
}
return NotImplemented, nil
}
func (a Bytes) M__eq__(other Object) (Object, error) {
if b, ok := convertToBytes(other); ok {
return NewBool(bytes.Compare(a, b) == 0), nil
}
return NotImplemented, nil
}
func (a Bytes) M__ne__(other Object) (Object, error) {
if b, ok := convertToBytes(other); ok {
return NewBool(bytes.Compare(a, b) != 0), nil
}
return NotImplemented, nil
}
func (a Bytes) M__gt__(other Object) (Object, error) {
if b, ok := convertToBytes(other); ok {
return NewBool(bytes.Compare(a, b) > 0), nil
}
return NotImplemented, nil
}
func (a Bytes) M__ge__(other Object) (Object, error) {
if b, ok := convertToBytes(other); ok {
return NewBool(bytes.Compare(a, b) >= 0), nil
}
return NotImplemented, nil
}
// Check interface is satisfied
var _ richComparison = (Bytes)(nil)