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