gpath

README

gpath

gpath is a Go package to access a field by a path using reflect pacakge.

A path is represented by a Go's expression such as A.B.C[0]. You can use selector and index expressions into a path.

See usage and example in GoDoc.

NOTE: This package is experimental and may make backward-incompatible changes.

Install

Use go get:

$ go get github.com/tenntenn/gpath

Usage

All usage are described in GoDoc.

mercari/go-httpdoc is a good example for gpath.

Documentation

Index

• func At(v interface{}, path string) (interface{}, error)

Examples

• At

Functions

func At

func At(v interface{}, path string) (interface{}, error)

At access a field of v by a path. v must be struct or pointer of struct. A path is represented by Go's expression which can be parsed by go/parser.ParseExpr. You can use selectors and indexes in a path. Slice and arrays index allow only expressions of int. Maps key allow only expressions of string, int and float64.

Example

type Bar struct {
	N []int
}

type Foo struct {
	Bar *Bar
}

f := &Foo{
	Bar: &Bar{
		N: []int{100},
	},
}

v, err := At(f, `Bar.N[0]`)
if err != nil {
	fmt.Println(err)
} else {
	fmt.Println(v)
}

Output:

100