68 lines
1.9 KiB
Go
68 lines
1.9 KiB
Go
/*
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* Amsterdam Web Communities System
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* Copyright (c) 2025 Erbosoft Metaverse Design Solutions, All Rights Reserved
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/.
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*/
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// Package util contains utility definitions.
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package util
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import (
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"strings"
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"github.com/bits-and-blooms/bitset"
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)
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// optionAlphabet is the alphabet from which OptionSets serialize to and from strings.
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const optionAlphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!#$%&()*+,-./:;<=>?@[]^_`{|}~"
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// OptionSet is a bit set that can be persisted as a specially-constructed string.
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type OptionSet struct {
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bits *bitset.BitSet
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}
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// Get retrieves the value of a bit from the given set.
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func (s *OptionSet) Get(ndx uint) bool {
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return s.bits.Test(ndx)
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}
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// Set sets the value of a bit in the given set.
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func (s *OptionSet) Set(ndx uint, v bool) {
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if v {
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s.bits = s.bits.Set(ndx)
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} else {
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s.bits = s.bits.Clear(ndx)
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}
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}
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// AsString returns the option set's value as a string.
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func (s *OptionSet) AsString() string {
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var b strings.Builder
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for i, e := s.bits.NextSet(0); e; i, e = s.bits.NextSet(i + 1) {
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b.WriteByte(optionAlphabet[int(i)])
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}
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return b.String()
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}
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// Clone creates a clone of this OptionSet.
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func (s *OptionSet) Clone() *OptionSet {
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return &OptionSet{bits: s.bits.Clone()}
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}
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// NewOptionSet creates and returns an empty option set.
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func NewOptionSet() *OptionSet {
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return &OptionSet{bits: bitset.New(uint(len(optionAlphabet)))}
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}
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// OptionSetFromString converts a string into a corresponding OptionSet.
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func OptionSetFromString(s string) *OptionSet {
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bs := bitset.New(uint(len(optionAlphabet)))
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for _, ch := range s {
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bs = bs.Set(uint(strings.IndexRune(optionAlphabet, ch)))
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}
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return &OptionSet{bits: bs}
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}
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