util.go

package opensearchutil

import (
	"reflect"
	"strings"
)

func MakePtr[V any](v V) *V {
	return &v
}

// getTagOptionValue gets a tag option value. For example, given a tag "type:keyword", getTagOptionValue("type")
// returns "keyword".
func getTagOptionValue(structField reflect.StructField, tagKey string, optionKey string) string {
	const tagOptionSep = ","
	const keyValSep = ":"
	if tag := structField.Tag.Get(tagKey); tag != "" {
		for _, kvs := range strings.Split(tag, tagOptionSep) {
			kv := strings.Split(kvs, keyValSep)
			if len(kv) > 1 {
				if strings.Trim(kv[0], " ") == optionKey {
					return strings.Join(kv[1:], keyValSep)
				}
			}
		}
	}
	return ""
}

// parseCustomPropertyValue parses a string like "min_chars=2;foo=bar" into a map like
// map[string]string{"min_chars":"2", "foo":"bar"}.
func parseCustomPropertyValue(str string) map[string]string {
	const keyValSep = "="
	pairs := strings.Split(str, ";")
	m := make(map[string]string, len(pairs))
	for _, kvs := range pairs {
		kv := strings.Split(kvs, keyValSep)
		if len(kv) > 1 {
			val := strings.Join(kv[1:], keyValSep)
			m[kv[0]] = val
		}
	}
	return m
}