package manifest import ( "errors" "sort" "github.com/nspcc-dev/neo-go/pkg/smartcontract" "github.com/nspcc-dev/neo-go/pkg/vm/stackitem" ) // Parameter represents smartcontract's parameter's definition. type Parameter struct { Name string `json:"name"` Type smartcontract.ParamType `json:"type"` } // Parameters is just an array of Parameter. type Parameters []Parameter // NewParameter returns new parameter of specified name and type. func NewParameter(name string, typ smartcontract.ParamType) Parameter { return Parameter{ Name: name, Type: typ, } } // IsValid checks Parameter consistency and correctness. func (p *Parameter) IsValid() error { if p.Name == "" { return errors.New("empty or absent name") } if p.Type == smartcontract.VoidType { return errors.New("void parameter") } _, err := smartcontract.ConvertToParamType(int(p.Type)) return err } // ToStackItem converts Parameter to stackitem.Item. func (p *Parameter) ToStackItem() stackitem.Item { return stackitem.NewStruct([]stackitem.Item{ stackitem.Make(p.Name), stackitem.Make(int(p.Type)), }) } // FromStackItem converts stackitem.Item to Parameter. func (p *Parameter) FromStackItem(item stackitem.Item) error { var err error if item.Type() != stackitem.StructT { return errors.New("invalid Parameter stackitem type") } param := item.Value().([]stackitem.Item) if len(param) != 2 { return errors.New("invalid Parameter stackitem length") } p.Name, err = stackitem.ToString(param[0]) if err != nil { return err } typ, err := param[1].TryInteger() if err != nil { return err } p.Type, err = smartcontract.ConvertToParamType(int(typ.Int64())) if err != nil { return err } return nil } // AreValid checks all parameters for validity and consistency. func (p Parameters) AreValid() error { for i := range p { err := p[i].IsValid() if err != nil { return err } } if len(p) < 2 { return nil } names := make([]string, len(p)) for i := range p { names[i] = p[i].Name } if stringsHaveDups(names) { return errors.New("duplicate parameter name") } return nil } // stringsHaveDups checks given set of strings for duplicates. It modifies the slice given! func stringsHaveDups(strings []string) bool { sort.Strings(strings) for i := range strings { if i == 0 { continue } if strings[i] == strings[i-1] { return true } } return false }