Hi, maybe, should you load the program via the loader, it helps *a lot* to deal with types relationships and many other things. https://github.com/golang/example/tree/master/gotypes https://godoc.org/golang.org/x/tools/go/loader
Now to understand the tree and understand it, I found this was useful, https://gist.github.com/mh-cbon/3ed5d9c39e9635cfed0f896000098133 Its the same as https://golang.org/pkg/go/ast/#Print but it won t print Object instance, making it clearer to read. Object instance are not useful to understand the ast structure, in my understanding. To get tag values, i guess you are looking for the Tag property of https://golang.org/pkg/go/ast/#Field On Friday, January 27, 2017 at 3:33:02 PM UTC+1, Jeffrey Smith wrote: > > I'm trying to use the ast and parse packages to find the fields in two > separate structs one that will be called Inputs and the other Outputs. > these can change but as an example i'm trying to parse these > > package main > > import ( > "fmt" > ) > > type Inputs struct { > Name string `json:"name"` > Age int `json:"age"` > } > > type Outputs struct { > Number float `json:"number"` > } > > func main() { > > fmt.Println("Hello World!") > } > > > > I have the following which can pick out the two structs but i'm now lost > on how to loop through the fields to get name, type and commenty bit > `json:"name"` at the end. > > package main > > import ( > "fmt" > "go/ast" > "go/parser" > "go/token" > "log" > ) > > func main() { > > fset := token.NewFileSet() > file, err := parser.ParseFile(fset, "sample/main.go", nil, 0) > if err != nil { > log.Fatal(err) > } > ast.Walk(VisitorFunc(FindTypes), file) > > } > > type VisitorFunc func(n ast.Node) ast.Visitor > > func (f VisitorFunc) Visit(n ast.Node) ast.Visitor { > return f(n) > } > > func FindTypes(n ast.Node) ast.Visitor { > switch n := n.(type) { > case *ast.Package: > return VisitorFunc(FindTypes) > case *ast.File: > return VisitorFunc(FindTypes) > case *ast.GenDecl: > if n.Tok == token.TYPE { > return VisitorFunc(FindTypes) > } > case *ast.TypeSpec: > if n.Name.Name == "Inputs" { > //We have hit the inputs struct > fmt.Println(n.Name.Name) > } > if n.Name.Name == "Outputs" { > //We have hit the outputs struct > fmt.Println(n.Name.Name) > } > } > return nil > } > > Any suggestions as to how to do it? > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
