75 lines
1.5 KiB
Go
75 lines
1.5 KiB
Go
package flatmap
|
|
|
|
import (
|
|
"fmt"
|
|
"strconv"
|
|
"strings"
|
|
)
|
|
|
|
// Expand takes a map and a key (prefix) and expands that value into
|
|
// a more complex structure. This is the reverse of the Flatten operation.
|
|
func Expand(m map[string]string, key string) interface{} {
|
|
// If the key is exactly a key in the map, just return it
|
|
if v, ok := m[key]; ok {
|
|
if v == "true" {
|
|
return true
|
|
} else if v == "false" {
|
|
return false
|
|
}
|
|
|
|
return v
|
|
}
|
|
|
|
// Check if the key is an array, and if so, expand the array
|
|
if _, ok := m[key+".#"]; ok {
|
|
return expandArray(m, key)
|
|
}
|
|
|
|
// Check if this is a prefix in the map
|
|
prefix := key + "."
|
|
for k, _ := range m {
|
|
if strings.HasPrefix(k, prefix) {
|
|
return expandMap(m, prefix)
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func expandArray(m map[string]string, prefix string) []interface{} {
|
|
num, err := strconv.ParseInt(m[prefix+".#"], 0, 0)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
result := make([]interface{}, num)
|
|
for i := 0; i < int(num); i++ {
|
|
result[i] = Expand(m, fmt.Sprintf("%s.%d", prefix, i))
|
|
}
|
|
|
|
return result
|
|
}
|
|
|
|
func expandMap(m map[string]string, prefix string) map[string]interface{} {
|
|
result := make(map[string]interface{})
|
|
for k, _ := range m {
|
|
if !strings.HasPrefix(k, prefix) {
|
|
continue
|
|
}
|
|
|
|
key := k[len(prefix):]
|
|
idx := strings.Index(key, ".")
|
|
if idx != -1 {
|
|
key = key[:idx]
|
|
}
|
|
if _, ok := result[key]; ok {
|
|
continue
|
|
}
|
|
|
|
// It contains a period, so it is a more complex structure
|
|
result[key] = Expand(m, k[:len(prefix)+len(key)])
|
|
}
|
|
|
|
return result
|
|
}
|