/
encode.go
186 lines (174 loc) · 4.73 KB
/
encode.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
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
// Copyright 2018 The Go 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 text
import (
"bytes"
"strings"
"github.com/golang/protobuf/v2/internal/detrand"
"github.com/golang/protobuf/v2/internal/errors"
)
// Marshal serializes v as the proto text format, where v must be a Message.
// In the proto text format, the top-level value is always a message where the
// delimiters are elided.
//
// If indent is a non-empty string, it causes every entry in a List or Message
// to be preceded by the indent and trailed by a newline.
//
// If delims is not the zero value, it controls the delimiter characters used
// for messages (e.g., "{}" vs "<>").
//
// If outputASCII is true, strings will be serialized in such a way that
// multi-byte UTF-8 sequences are escaped. This property ensures that the
// overall output is ASCII (as opposed to UTF-8).
func Marshal(v Value, indent string, delims [2]byte, outputASCII bool) ([]byte, error) {
p := encoder{}
if len(indent) > 0 {
if strings.Trim(indent, " \t") != "" {
return nil, errors.New("indent may only be composed of space and tab characters")
}
p.indent = indent
p.newline = "\n"
}
switch delims {
case [2]byte{0, 0}:
p.delims = [2]byte{'{', '}'}
case [2]byte{'{', '}'}, [2]byte{'<', '>'}:
p.delims = delims
default:
return nil, errors.New("delimiters may only be \"{}\" or \"<>\"")
}
p.outputASCII = outputASCII
err := p.marshalMessage(v, false)
if !p.nerr.Merge(err) {
return nil, err
}
if len(indent) > 0 {
return append(bytes.TrimRight(p.out, "\n"), '\n'), p.nerr.E
}
return p.out, p.nerr.E
}
type encoder struct {
nerr errors.NonFatal
out []byte
indent string
indents []byte
newline string // set to "\n" if len(indent) > 0
delims [2]byte
outputASCII bool
}
func (p *encoder) marshalList(v Value) error {
if v.Type() != List {
return errors.New("invalid type %v, expected list", v.Type())
}
elems := v.List()
p.out = append(p.out, '[')
p.indents = append(p.indents, p.indent...)
if len(elems) > 0 {
p.out = append(p.out, p.newline...)
}
for i, elem := range elems {
p.out = append(p.out, p.indents...)
if err := p.marshalValue(elem); !p.nerr.Merge(err) {
return err
}
if i < len(elems)-1 {
p.out = append(p.out, ',')
}
p.out = append(p.out, p.newline...)
}
p.indents = p.indents[:len(p.indents)-len(p.indent)]
if len(elems) > 0 {
p.out = append(p.out, p.indents...)
}
p.out = append(p.out, ']')
return nil
}
func (p *encoder) marshalMessage(v Value, emitDelims bool) error {
if v.Type() != Message {
return errors.New("invalid type %v, expected message", v.Type())
}
items := v.Message()
if emitDelims {
p.out = append(p.out, p.delims[0])
p.indents = append(p.indents, p.indent...)
if len(items) > 0 {
p.out = append(p.out, p.newline...)
}
}
for i, item := range items {
p.out = append(p.out, p.indents...)
if err := p.marshalKey(item[0]); !p.nerr.Merge(err) {
return err
}
p.out = append(p.out, ':')
if len(p.indent) > 0 {
p.out = append(p.out, ' ')
}
// For multi-line output, add a random extra space after key: per message to
// make output unstable.
if len(p.indent) > 0 && detrand.Bool() {
p.out = append(p.out, ' ')
}
if err := p.marshalValue(item[1]); !p.nerr.Merge(err) {
return err
}
if i < len(items)-1 && len(p.indent) == 0 {
p.out = append(p.out, ' ')
}
// For single-line output, add a random extra space after a field per message to
// make output unstable.
if len(p.indent) == 0 && detrand.Bool() && i != len(items)-1 {
p.out = append(p.out, ' ')
}
p.out = append(p.out, p.newline...)
}
if emitDelims {
p.indents = p.indents[:len(p.indents)-len(p.indent)]
if len(items) > 0 {
p.out = append(p.out, p.indents...)
}
p.out = append(p.out, p.delims[1])
}
return nil
}
func (p *encoder) marshalKey(v Value) error {
switch v.Type() {
case String:
var err error
p.out = append(p.out, '[')
if len(urlRegexp.FindString(v.str)) == len(v.str) {
p.out = append(p.out, v.str...)
} else {
err = p.marshalString(v)
}
p.out = append(p.out, ']')
return err
case Uint:
return p.marshalNumber(v)
case Name:
s, _ := v.Name()
p.out = append(p.out, s...)
return nil
default:
return errors.New("invalid type %v to encode key", v.Type())
}
}
func (p *encoder) marshalValue(v Value) error {
switch v.Type() {
case Bool, Int, Uint, Float32, Float64:
return p.marshalNumber(v)
case String:
return p.marshalString(v)
case List:
return p.marshalList(v)
case Message:
return p.marshalMessage(v, true)
case Name:
s, _ := v.Name()
p.out = append(p.out, s...)
return nil
default:
return errors.New("invalid type %v to encode value", v.Type())
}
}