package go/ast
A Field represents a Field declaration list in a struct type, a method list in an interface type, or a parameter/result declaration in a signature.
Golang go/ast.Field type, End() and Pos() functions usage examples
Example 1:
func NodeDescription(n ast.Node) string {
switch n := n.(type) {
case *ast.ArrayType:
return "array type"
case *ast.Field:
// Can be any of these:
// struct {x, y int} -- struct field(s)
// struct {T} -- anon struct field
// interface {I} -- interface embedding
// interface {f()} -- interface method
// func (A) func(B) C -- receiver, param(s), result(s)
return "field/method/parameter"
...
}
Example 2:
func checkCurrentPosition(node ast.Node) string {
n := node.(*ast.Field)
endpos := n.End()
pospos := n.Pos()
if pospos != endpos {
return "not yet"
}
}
Example 3:
func checkFieldTag(f *File, node ast.Node) {
field := node.(*ast.Field)
if field.Tag == nil {
return
}
...
}
References :
http://golang.org/pkg/go/ast/#Field
http://golang.org/pkg/go/ast/#Field.End
http://golang.org/pkg/go/ast/#Field.Pos
