73 lines
1.9 KiB
Go
73 lines
1.9 KiB
Go
// Copyright 2019 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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// Contains a batch of utility type declarations used by the tests. As the node
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// operates on unique types, a lot of them are needed to check various features.
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package statediff
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import (
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"sort"
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"strings"
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)
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func sortKeys(data AccountMap) []string {
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keys := make([]string, 0, len(data))
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for key := range data {
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keys = append(keys, key)
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}
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sort.Strings(keys)
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return keys
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}
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// findIntersection finds the set of strings from both arrays that are equivalent
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// a and b must first be sorted
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// this is used to find which keys have been both "deleted" and "created" i.e. they were updated
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func findIntersection(a, b []string) []string {
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lenA := len(a)
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lenB := len(b)
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iOfA, iOfB := 0, 0
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updates := make([]string, 0)
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if iOfA >= lenA || iOfB >= lenB {
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return updates
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}
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for {
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switch strings.Compare(a[iOfA], b[iOfB]) {
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// -1 when a[iOfA] < b[iOfB]
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case -1:
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iOfA++
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if iOfA >= lenA {
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return updates
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}
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// 0 when a[iOfA] == b[iOfB]
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case 0:
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updates = append(updates, a[iOfA])
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iOfA++
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iOfB++
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if iOfA >= lenA || iOfB >= lenB {
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return updates
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}
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// 1 when a[iOfA] > b[iOfB]
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case 1:
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iOfB++
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if iOfB >= lenB {
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return updates
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}
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}
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}
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}
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