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utils.go
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utils.go
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package gonfig
import (
"fmt"
"reflect"
"regexp"
"strings"
)
var (
firstCapRegex = regexp.MustCompile("([A-Z])([A-Z][a-z])")
allCapRegex = regexp.MustCompile("([a-z0-9])([A-Z])")
)
// toSnakeCase converts input string into snake_case form
func toSnakeCase(s string) string {
out := firstCapRegex.ReplaceAllString(s, "${1}_${2}")
out = allCapRegex.ReplaceAllString(out, "${1}_${2}")
out = strings.ReplaceAll(out, "-", "_")
return out
}
func isStruct(t reflect.Type) bool {
return t.Kind() == reflect.Struct && !isTime(t) && !isURL(t)
}
func isDuration(t reflect.Type) bool {
return t.PkgPath() == "time" && t.Name() == "Duration"
}
func isTime(t reflect.Type) bool {
return t.PkgPath() == "time" && t.Name() == "Time"
}
func isURL(t reflect.Type) bool {
return t.PkgPath() == "net/url" && t.Name() == "URL"
}
// traverseMap finds a value in a map based on provided path
func traverseMap(m map[string]interface{}, path []string) (string, bool) {
if len(path) == 0 {
return "", false
}
first, path := path[0], path[1:]
value, exists := m[first]
if !exists {
value, exists = m[strings.ToLower(first)]
if !exists {
return "", false
}
}
if len(path) == 0 {
return fmt.Sprint(value), true
}
nestedMap, ok := value.(map[string]interface{})
if !ok {
nestedInterfaceMap, ok := value.(map[interface{}]interface{})
if !ok {
return "", false
}
nestedMap = make(map[string]interface{})
for k, v := range nestedInterfaceMap {
nestedMap[fmt.Sprint(k)] = v
}
}
return traverseMap(nestedMap, path)
}
// extractItems splits and trims input string based on separator
func extractItems(str string, sep string) []string {
var items []string
for _, v := range strings.Split(str, sep) {
item := strings.TrimSpace(v)
if len(item) > 0 {
items = append(items, item)
}
}
return items
}