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/*
* Copyright (C) 2016 ~ 2018 Deepin Technology Co., Ltd.
*
* Author: jouyouyun <jouyouwen717@gmail.com>
*
* 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, either version 3 of the License, or
* any later version.
*
* 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 kv reads key value files.
package kv
import (
"bufio"
"bytes"
"errors"
"io"
"unicode"
)
type Reader struct {
// Delim is key value delimiter
Delim byte
// Comment, if not 0, is the comment character. Lines begin with the
// Comment character are ignored.
Comment byte
// TrimSpace determines the behavior of trim space
TrimSpace TrimSpaceFlag
r *bufio.Reader
}
type TrimSpaceFlag uint
const (
TrimLeadingSpace TrimSpaceFlag = 1 << iota
TrimTailingSpace
TrimDelimLeftSpace
TrimDelimRightSpace
)
const (
TrimAllSpace = TrimLeadingSpace | TrimTailingSpace |
TrimDelimLeftSpace | TrimDelimRightSpace
TrimLeadingTailingSpace = TrimLeadingSpace | TrimTailingSpace
)
// NewReader returns a new Reader that reads from r.
// The Delim field default to '=', the TrimSpace field default to TrimAllSpace.
func NewReader(r io.Reader) *Reader {
return &Reader{
Delim: '=',
r: bufio.NewReader(r),
TrimSpace: TrimAllSpace,
}
}
type Pair struct {
Key string
Value string
}
// Read reads one pair from r.
func (r *Reader) Read() (pair *Pair, err error) {
for {
pair, err = r.parseLine()
if pair != nil {
break
}
if err != nil {
return nil, err
}
}
return pair, nil
}
// ReadAll reads all the remaining pairs from r.
// A successful call returns err == nil, not err == io.EOF.
// Because ReadAll is defined to read until EOF,
// it does not treat end of file as an error to be reported.
func (r *Reader) ReadAll() (pairs []*Pair, err error) {
for {
pair, err := r.Read()
if err == io.EOF {
return pairs, nil
}
if err != nil {
return nil, err
}
pairs = append(pairs, pair)
}
}
var ErrBadLine = errors.New("bad line")
func (r *Reader) parseLine() (*Pair, error) {
line, err := r.r.ReadBytes('\n')
if err != nil {
return nil, err
}
if r.TrimSpace&TrimLeadingSpace != 0 {
line = bytes.TrimLeftFunc(line, unicode.IsSpace)
}
if r.TrimSpace&TrimTailingSpace != 0 {
line = bytes.TrimRightFunc(line, unicode.IsSpace)
}
// skip empty line
if len(line) == 0 {
return nil, nil
}
b1 := line[0]
if r.Comment != 0 && b1 == r.Comment {
// skip comment line
return nil, nil
}
parts := bytes.SplitN(line, []byte{r.Delim}, 2)
if len(parts) != 2 {
return nil, ErrBadLine
}
key := parts[0]
if r.TrimSpace&TrimDelimLeftSpace != 0 {
key = bytes.TrimRightFunc(key, unicode.IsSpace)
}
value := parts[1]
if r.TrimSpace&TrimDelimRightSpace != 0 {
value = bytes.TrimLeftFunc(value, unicode.IsSpace)
}
return &Pair{
Key: string(key),
Value: string(value),
}, nil
}
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