hydrogen
is a library designed to get names, values and pointers to structure fields.
hydrogen
can be installed like any other Go library through go get
:
go get github.com/gromey/hydrogen@latest
package main
import (
"fmt"
"github.com/gromey/hydrogen"
)
type Type struct {
A string // will be returned with the 'A' name
B string `tag:"b"` // will be returned with the 'b' name
C string `tag:"-"` // will be skipped
D string `tag:"d"`
}
func main() {
tag := hydrogen.New("tag")
s := new(Type)
s.A = "fa"
s.B = "fb"
s.C = "fc"
s.D = ""
fls, err := tag.Fields(s, false)
if err != nil {
panic(err)
}
names := fls.Names()
fmt.Printf("names: %v\n", names)
// names: [A b d]
values := fls.Values()
fmt.Printf("values: %v\n", values)
// values: [fa fb ]
pointers := fls.Pointers()
fmt.Println("pointers:", &s.A == pointers[0], &s.B == pointers[1], &s.D == pointers[2])
// pointers: true, true, true
// s.D will be omitted because it's empty
fls, err = tag.Fields(s, true)
if err != nil {
panic(err)
}
names = fls.Names()
fmt.Printf("names: %v\n", names)
// names: [A b]
values = fls.Values()
fmt.Printf("values: %v\n", values)
// values: [fa fb]
pointers = fls.Pointers()
fmt.Println("pointers:", &s.A == pointers[0], &s.B == pointers[1])
// pointers: true, true
}