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
|
// recfile -- GNU recutils'es recfiles parser on pure Go
// Copyright (C) 2020-2024 Sergey Matveev <stargrave@stargrave.org>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 3 of the License.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package recfile
import (
"bufio"
"errors"
"io"
"strings"
)
type Reader struct {
scanner *bufio.Scanner
}
// Create Reader for iterating through the records. It uses
// bufio.Scanner, so can read more than currently parsed records take.
func NewReader(r io.Reader) *Reader {
return &Reader{bufio.NewScanner(r)}
}
func getKeyValue(text string) (string, string) {
cols := strings.SplitN(text, ":", 2)
if len(cols) != 2 {
return "", ""
}
k := cols[0]
if len(k) == 0 {
return "", ""
}
if !((k[0] == '%') ||
('a' <= k[0] && k[0] <= 'z') ||
('A' <= k[0] && k[0] <= 'Z')) {
return "", ""
}
for _, c := range k[1:] {
if !((c == '_') ||
('a' <= c && c <= 'z') ||
('A' <= c && c <= 'Z') ||
('0' <= c && c <= '9')) {
return "", ""
}
}
return k, strings.TrimPrefix(cols[1], " ")
}
// Get next record. Each record is just a collection of fields. io.EOF
// is returned if there is nothing to read more.
func (r *Reader) Next() ([]Field, error) {
fields := make([]Field, 0, 1)
var text string
var name string
var line string
lines := make([]string, 0)
continuation := false
var err error
for {
if !r.scanner.Scan() {
if err := r.scanner.Err(); err != nil {
return fields, err
}
err = io.EOF
break
}
text = r.scanner.Text()
if continuation {
if len(text) == 0 {
continuation = false
} else if text[len(text)-1] == '\\' {
lines = append(lines, text[:len(text)-1])
} else {
lines = append(lines, text)
fields = append(fields, Field{name, strings.Join(lines, "")})
lines = make([]string, 0)
continuation = false
}
continue
}
if len(text) > 0 && text[0] == '#' {
continue
}
if len(text) > 0 && text[0] == '+' {
lines = append(lines, "\n")
if len(text) > 1 {
if text[1] == ' ' {
lines = append(lines, text[2:])
} else {
lines = append(lines, text[1:])
}
}
continue
}
if len(lines) > 0 {
fields = append(fields, Field{name, strings.Join(lines, "")})
lines = make([]string, 0)
}
if text == "" {
break
}
name, line = getKeyValue(text)
if name == "" {
return fields, errors.New("invalid field format")
}
if len(line) > 0 && line[len(line)-1] == '\\' {
continuation = true
lines = append(lines, line[:len(line)-1])
} else {
lines = append(lines, line)
}
}
if continuation {
return fields, errors.New("left continuation")
}
if len(lines) > 0 {
fields = append(fields, Field{name, strings.Join(lines, "")})
}
if len(fields) == 0 {
if err == nil {
return r.Next()
}
return fields, err
}
return fields, nil
}
// Same as Next(), but with unique keys and last value.
func (r *Reader) NextMap() (map[string]string, error) {
fields, err := r.Next()
if err != nil {
return nil, err
}
m := make(map[string]string, len(fields))
for _, f := range fields {
m[f.Name] = f.Value
}
return m, nil
}
// Same as Next(), but with unique keys and slices of values.
func (r *Reader) NextMapWithSlice() (map[string][]string, error) {
fields, err := r.Next()
if err != nil {
return nil, err
}
m := make(map[string][]string)
for _, f := range fields {
m[f.Name] = append(m[f.Name], f.Value)
}
return m, nil
}
|
