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core,vm: remove System.Enumerator.* interops

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Map iterator now returns key-value pair, while array/byte-array
iterators work like old enumerators.
Follow neo-project/neo#2190.
This commit is contained in:
Evgeniy Stratonikov 2021-01-12 12:30:21 +03:00 • committed by Roman Khimov
parent d04b000748
commit 2130e17f0c
16 changed files with 86 additions and 422 deletions
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30
pkg/interop/iterator/iterator.go
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@ -3,8 +3,6 @@ Package iterator provides functions to work with Neo iterators.
*/
package iterator
import "github.com/nspcc-dev/neo-go/pkg/interop/enumerator"
// Iterator represents a Neo iterator, it's an opaque data structure that can
// be properly created by Create or storage.Find. Unlike enumerators, iterators
// range over key-value pairs, so it's convenient to use them for maps. This
@ -19,37 +17,17 @@ func Create(items interface{}) Iterator {
return Iterator{}
}
// Key returns iterator's key at current position. It's only valid to call after
// successful Next call. This function uses `System.Iterator.Key` syscall.
func Key(it Iterator) interface{} {
return nil
}
// Keys returns Enumerator ranging over keys or the given Iterator. Note that
// this Enumerator is actually directly tied to the underlying Iterator, so that
// advancing it with Next will actually advance the Iterator too. This function
// uses `System.Iterator.Keys` syscall.
func Keys(it Iterator) enumerator.Enumerator {
return enumerator.Enumerator{}
}
// Next advances the iterator returning true if it is was successful (and you
// can use Key or Value) and false otherwise (and there are no more elements in
// this Iterator). This function uses `System.Enumerator.Next` syscall.
// this Iterator). This function uses `System.Iterator.Next` syscall.
func Next(it Iterator) bool {
return true
}
// Value returns iterator's current value. It's only valid to call after
// successful Next call. This function uses `System.Enumerator.Value` syscall.
// successful Next call. This function uses `System.Iterator.Value` syscall.
// For slices the result is just value.
// For maps the result can be casted to a slice of 2 elements: key and value.
func Value(it Iterator) interface{} {
return nil
}
// Values returns Enumerator ranging over values or the given Iterator. Note that
// this Enumerator is actually directly tied to the underlying Iterator, so that
// advancing it with Next will actually advance the Iterator too. This function
// uses `System.Iterator.Values` syscall.
func Values(it Iterator) enumerator.Enumerator {
return enumerator.Enumerator{}
}