reflectutil

README

reflectutil

The package contains various helpers for reflection

Documentation

Index

• func GetStructField(structInstance interface{}, fieldname string) reflect.Value
• func GetUnexportedField(structInstance interface{}, fieldname string) interface{}
• func SetUnexportedField(structInstance interface{}, fieldname string, value interface{})
• func SizeOf(v interface{}) int
• func ToMap(v interface{}, tomapkey ToMapKey, unexported bool) (map[string]interface{}, error)
• func ToMapWithDefault(v interface{}) (map[string]interface{}, error)
• func UnwrapUnexportedField(field reflect.Value) interface{}
• type ToMapKey

Functions

func GetStructField

func GetStructField(structInstance interface{}, fieldname string) reflect.Value

GetStructField obtains a reference to a field of a pointer to a struct

func GetUnexportedField

func GetUnexportedField(structInstance interface{}, fieldname string) interface{}

GetUnexportedField unwraps an unexported field with pointer to struct and field name

func SetUnexportedField

func SetUnexportedField(structInstance interface{}, fieldname string, value interface{})

SetUnexportedField sets (pointer to) struct's field with the specified value

func SizeOf

func SizeOf(v interface{}) int

SizeOf returns the size of 'v' in bytes. If there is an error during calculation, Of returns -1.

Implementation is taken from https://github.com/DmitriyVTitov/size/blob/v1.5.0/size.go#L14 which in turn is inspired from binary.Size of stdlib

func ToMap

func ToMap(v interface{}, tomapkey ToMapKey, unexported bool) (map[string]interface{}, error)

ToMap converts exported fields of a struct to map[string]interface{} - non exported fields are converted to string

func ToMapWithDefault

func ToMapWithDefault(v interface{}) (map[string]interface{}, error)

ToMapWithDefault settings

func UnwrapUnexportedField

func UnwrapUnexportedField(field reflect.Value) interface{}

UnwrapUnexportedField unwraps an unexported field

Types

type ToMapKey

type ToMapKey func(string) string

var TitleUnderscore ToMapKey = func(raw string) string {
	newstr := make([]rune, 0, len(raw))
	for i, chr := range raw {
		if isUpper := 'A' <= chr && chr <= 'Z'; isUpper {
			if i > 0 {
				newstr = append(newstr, '_')
			}
			chr -= 'A' - 'a'
		}
		newstr = append(newstr, chr)
	}
	return string(newstr)
}

TitleUnderscore from https://github.com/go-ini/ini/blob/5e97220809ffaa826f787728501264e9114cb834/struct.go#L46