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58 lines
1.8 KiB
Go
58 lines
1.8 KiB
Go
// Copyright 2023 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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package light
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// Range represents a (possibly zero-length) range of integers (sync periods).
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type Range struct {
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First uint64
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AfterLast uint64
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}
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// IsEmpty returns true if the length of the range is zero.
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func (a Range) IsEmpty() bool {
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return a.AfterLast == a.First
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}
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// Includes returns true if the range includes the given period.
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func (a Range) Includes(period uint64) bool {
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return period >= a.First && period < a.AfterLast
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}
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// CanExpand returns true if the range can be expanded with the given period
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// (either the range is empty or the new period is right before or after the range).
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func (a Range) CanExpand(period uint64) bool {
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return a.IsEmpty() || (period+1 >= a.First && period <= a.AfterLast)
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}
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// Expand expands the range with the given period (assumes that CanExpand returned true).
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func (a *Range) Expand(period uint64) {
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if a.IsEmpty() {
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a.First, a.AfterLast = period, period+1
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return
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}
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if a.Includes(period) {
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return
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}
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if a.First == period+1 {
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a.First--
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return
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}
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if a.AfterLast == period {
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a.AfterLast++
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return
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}
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}
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