2 recfile -- GNU recutils'es recfiles parser on pure Go
3 Copyright (C) 2020-2023 Sergey Matveev <stargrave@stargrave.org>
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation, version 3 of the License.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>.
28 scanner *bufio.Scanner
31 // Create Reader for iterating through the records. It uses
32 // bufio.Scanner, so can read more than currently parsed records take.
33 func NewReader(r io.Reader) *Reader {
34 return &Reader{bufio.NewScanner(r)}
37 func getKeyValue(text string) (string, string) {
38 cols := strings.SplitN(text, ":", 2)
47 ('a' <= k[0] && k[0] <= 'z') ||
48 ('A' <= k[0] && k[0] <= 'Z')) {
51 for _, c := range k[1:] {
53 ('a' <= c && c <= 'z') ||
54 ('A' <= c && c <= 'Z') ||
55 ('0' <= c && c <= '9')) {
59 return k, strings.TrimPrefix(cols[1], " ")
62 // Get next record. Each record is just a collection of fields. io.EOF
63 // is returned if there is nothing to read more.
64 func (r *Reader) Next() ([]Field, error) {
65 fields := make([]Field, 0, 1)
69 lines := make([]string, 0)
73 if !r.scanner.Scan() {
74 if err := r.scanner.Err(); err != nil {
80 text = r.scanner.Text()
85 } else if text[len(text)-1] == '\\' {
86 lines = append(lines, text[:len(text)-1])
88 lines = append(lines, text)
89 fields = append(fields, Field{name, strings.Join(lines, "")})
90 lines = make([]string, 0)
96 if len(text) > 0 && text[0] == '#' {
100 if len(text) > 0 && text[0] == '+' {
101 lines = append(lines, "\n")
104 lines = append(lines, text[2:])
106 lines = append(lines, text[1:])
113 fields = append(fields, Field{name, strings.Join(lines, "")})
114 lines = make([]string, 0)
121 name, line = getKeyValue(text)
123 return fields, errors.New("invalid field format")
126 if len(line) > 0 && line[len(line)-1] == '\\' {
128 lines = append(lines, line[:len(line)-1])
130 lines = append(lines, line)
134 return fields, errors.New("left continuation")
137 fields = append(fields, Field{name, strings.Join(lines, "")})
139 if len(fields) == 0 {
148 // Same as Next(), but with unique keys and last value.
149 func (r *Reader) NextMap() (map[string]string, error) {
150 fields, err := r.Next()
154 m := make(map[string]string, len(fields))
155 for _, f := range fields {
161 // Same as Next(), but with unique keys and slices of values.
162 func (r *Reader) NextMapWithSlice() (map[string][]string, error) {
163 fields, err := r.Next()
167 m := make(map[string][]string)
168 for _, f := range fields {
169 m[f.Name] = append(m[f.Name], f.Value)