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package ff
import (
"bufio"
"io"
"strings"
)
// PlainParser is a parser for config files in an extremely simple format. Each
// line is tokenized as a single key/value pair. The first whitespace-delimited
// token in the line is interpreted as the flag name, and all remaining tokens
// are interpreted as the value. Any leading hyphens on the flag name are
// ignored.
func PlainParser(r io.Reader, set func(name, value string) error) error {
s := bufio.NewScanner(r)
for s.Scan() {
line := strings.TrimSpace(s.Text())
if line == "" {
continue // skip empties
}
if line[0] == '#' {
continue // skip comments
}
var (
name string
value string
index = strings.IndexRune(line, ' ')
)
if index < 0 {
name, value = line, "true" // boolean option
} else {
name, value = line[:index], strings.TrimSpace(line[index:])
}
if i := strings.Index(value, " #"); i >= 0 {
value = strings.TrimSpace(value[:i])
}
if err := set(name, value); err != nil {
return err
}
}
return nil
}
|
