fully implemented profile editing

util/optionset.go

@@ -0,0 +1,67 @@
+/*
+ * Amsterdam Web Communities System
+ * Copyright (c) 2025 Erbosoft Metaverse Design Solutions, All Rights Reserved
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+// Package util contains utility definitions.
+package util
+
+import (
+	"strings"
+
+	"github.com/bits-and-blooms/bitset"
+)
+
+// optionAlphabet is the alphabet from which OptionSets serialize to and from strings.
+const optionAlphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!#$%&()*+,-./:;<=>?@[]^_`{|}~"
+
+// OptionSet is a bit set that can be persisted as a specially-constructed string.
+type OptionSet struct {
+	bits *bitset.BitSet
+}
+
+// Get retrieves the value of a bit from the given set.
+func (s *OptionSet) Get(ndx uint) bool {
+	return s.bits.Test(ndx)
+}
+
+// Set sets the value of a bit in the given set.
+func (s *OptionSet) Set(ndx uint, v bool) {
+	if v {
+		s.bits = s.bits.Set(ndx)
+	} else {
+		s.bits = s.bits.Clear(ndx)
+	}
+}
+
+// AsString returns the option set's value as a string.
+func (s *OptionSet) AsString() string {
+	var b strings.Builder
+	for i, e := s.bits.NextSet(0); e; i, e = s.bits.NextSet(i + 1) {
+		b.WriteByte(optionAlphabet[int(i)])
+	}
+	return b.String()
+}
+
+// Clone creates a clone of this OptionSet.
+func (s *OptionSet) Clone() *OptionSet {
+	return &OptionSet{bits: s.bits.Clone()}
+}
+
+// NewOptionSet creates and returns an empty option set.
+func NewOptionSet() *OptionSet {
+	return &OptionSet{bits: bitset.New(uint(len(optionAlphabet)))}
+}
+
+// OptionSetFromString converts a string into a corresponding OptionSet.
+func OptionSetFromString(s string) *OptionSet {
+	bs := bitset.New(uint(len(optionAlphabet)))
+	for _, ch := range s {
+		bs = bs.Set(uint(strings.IndexRune(optionAlphabet, ch)))
+	}
+	return &OptionSet{bits: bs}
+}