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- // Copyright (c) 2017 Couchbase, Inc.
- //
- // Licensed under the Apache License, Version 2.0 (the "License");
- // you may not use this file except in compliance with the License.
- // You may obtain a copy of the License at
- //
- // http://www.apache.org/licenses/LICENSE-2.0
- //
- // Unless required by applicable law or agreed to in writing, software
- // distributed under the License is distributed on an "AS IS" BASIS,
- // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- // See the License for the specific language governing permissions and
- // limitations under the License.
-
- package regexp
-
- type sparseSet struct {
- dense []uint
- sparse []uint
- size uint
- }
-
- func newSparseSet(size uint) *sparseSet {
- return &sparseSet{
- dense: make([]uint, size),
- sparse: make([]uint, size),
- size: 0,
- }
- }
-
- func (s *sparseSet) Len() int {
- return int(s.size)
- }
-
- func (s *sparseSet) Add(ip uint) uint {
- i := s.size
- s.dense[i] = ip
- s.sparse[ip] = i
- s.size++
- return i
- }
-
- func (s *sparseSet) Get(i uint) uint {
- return s.dense[i]
- }
-
- func (s *sparseSet) Contains(ip uint) bool {
- i := s.sparse[ip]
- return i < s.size && s.dense[i] == ip
- }
-
- func (s *sparseSet) Clear() {
- s.size = 0
- }
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