Function stringify

parse/getast.go:664–695

stringify a field type name

(e ast.Expr)

// stringify a field type name
func stringify(e ast.Expr) string {
	switch e := e.(type) {
	case *ast.Ident:
		return e.Name
	case *ast.StarExpr:
		return "*" + stringify(e.X)
	case *ast.SelectorExpr:
		return stringify(e.X) + "." + e.Sel.Name
	case *ast.ArrayType:
		if e.Len == nil {
			return "[]" + stringify(e.Elt)
		}
		return fmt.Sprintf("[%s]%s", stringify(e.Len), stringify(e.Elt))
	case *ast.InterfaceType:
		if e.Methods == nil || e.Methods.NumFields() == 0 {
			return "interface{}"
		}
	case *ast.BasicLit:
		return e.Value
	case *ast.IndexExpr:
		// Single type argument: Generic[T]
		return fmt.Sprintf("%s[%s]", stringify(e.X), stringify(e.Index))
	case *ast.IndexListExpr:
		// Multiple type arguments: Generic[A,B,...]
		args := make([]string, 0, len(e.Indices))
		for _, ix := range e.Indices {
			args = append(args, stringify(ix))
		}
		return fmt.Sprintf("%s[%s]", stringify(e.X), strings.Join(args, ","))
	}
	return "<BAD>"
}

// recursively translate ast.Expr to gen.Elem; nil means type not supported
// expected input types: