// SubKeys returns the sub-keys for the given prefix.
//
// Given:
// ------
// db.us.host www.host.com
// db.us.port 1234
// db.gb.host www.host.com
// db.gb.port 1234
//
// Then:
// -----
// SubKeys("db") => ["us", "gb"]
// SubKeys("db", "us") => ["host", "port"]
// SubKeys("db", "us", "port") => []
//
func (c *Config) SubKeys(stems ...string) []string {
result := make([]string, 0, 1)
prefix := join(stems...) + "."
added := set.NewS()
for _, e := range c.entries {
// Found Prefix
if strings.HasPrefix(e.key, prefix) {
// Remove Prefix and Split Suffix
suffix := strings.TrimPrefix(e.key, prefix)
pieces := strings.Split(suffix, ".")
// Add Sub-Key
if len(pieces) > 0 {
subKey := pieces[0]
if !added.Contains(subKey) {
result = append(result, subKey)
added.Insert(subKey)
}
}
}
}
return result
}
// New returns a new Config object constructed using the supplied filename
func New(filename string) *Config {
c := &Config{
defines: make(map[string]string),
includes: set.NewS(),
}
c.fromFile(filename)
return c
}