lotus/postfix-config/config-parser/config-parser.go

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2023-08-21 00:26:22 +01:00
package config_parser
import (
"bufio"
"errors"
"io"
"strings"
)
var ErrInvalidConfigLine = errors.New("invalid config line")
type ConfigParser struct {
s *bufio.Scanner
pair [2]string
err error
}
func NewConfigParser(r io.Reader) *ConfigParser {
return &ConfigParser{s: bufio.NewScanner(r)}
}
func (c *ConfigParser) Scan() bool {
scanAgain:
if !c.s.Scan() {
return false
}
text := strings.TrimSpace(c.s.Text())
if text == "" || strings.HasPrefix(text, "#") {
goto scanAgain
}
n := strings.IndexByte(text, '=')
if n < 2 || n+2 >= len(text) || text[n-1] != ' ' || text[n+1] != ' ' {
c.err = ErrInvalidConfigLine
return false
}
c.pair = [2]string{text[:n-1], text[n+2:]}
return true
}
func (c *ConfigParser) Pair() (string, string) {
return strings.TrimSpace(c.pair[0]), strings.TrimSpace(c.pair[1])
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}
func (c *ConfigParser) Err() error {
if c.err != nil {
return c.err
}
return c.s.Err()
}