Function transformListOrMapping

cli/compose/loader/loader.go:822–848

transformListOrMapping transforms pairs of strings that may be represented as a map, or a list of '=' or ':' separated strings, into a list of ':' separated strings.

(listOrMapping any, sep string, allowNil bool, allowSeps []string)

// a map, or a list of '=' or ':' separated strings, into a list of ':' separated
// strings.
func transformListOrMapping(listOrMapping any, sep string, allowNil bool, allowSeps []string) []string {
	switch value := listOrMapping.(type) {
	case map[string]any:
		return toStringList(value, sep, allowNil)
	case []any:
		result := make([]string, 0, len(value))
		for _, entry := range value {
			for i, allowSep := range allowSeps {
				entry := fmt.Sprint(entry)
				k, v, ok := strings.Cut(entry, allowSep)
				if ok {
					// Entry uses this allowed separator. Add it to the result, using
					// sep as a separator.
					result = append(result, fmt.Sprintf("%s%s%s", k, sep, v))
					break
				} else if i == len(allowSeps)-1 {
					// No more separators to try, keep the entry if allowNil.
					if allowNil {
						result = append(result, k)
					}
				}
			}
		}
		return result
	}
	panic(fmt.Errorf("expected a map or a list, got %T: %#v", listOrMapping, listOrMapping))
}

func transformMappingOrListFunc(sep string, allowNil bool) TransformerFunc {
	return func(data any) (any, error) {