92 lines
3.5 KiB
Swift
92 lines
3.5 KiB
Swift
//
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// Copyright (c) 2022 Touch Instinct
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the Software), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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private extension Substring.SubSequence {
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func recursivePairCheck(requiredMatches: UInt,
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sequenceRequiredMatches: UInt,
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checkClosure: (Character, Character) -> Bool) -> Bool {
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guard sequenceRequiredMatches > 0 else {
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return true
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}
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guard !isEmpty else {
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return false
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}
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let tail = dropFirst()
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guard let current = first, let next = tail.first else {
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return false
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}
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let matched = checkClosure(current, next)
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let reducedMatches = sequenceRequiredMatches - (matched ? 1 : 0)
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let currentSequenceMatch = matched
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&& tail.recursivePairCheck(requiredMatches: requiredMatches,
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sequenceRequiredMatches: reducedMatches,
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checkClosure: checkClosure)
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return currentSequenceMatch || tail.recursivePairCheck(requiredMatches: requiredMatches,
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sequenceRequiredMatches: requiredMatches,
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checkClosure: checkClosure)
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}
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func recursivePairCheck(requiredMatches: UInt, checkClosure: (Character, Character) -> Bool) -> Bool {
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recursivePairCheck(requiredMatches: requiredMatches,
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sequenceRequiredMatches: requiredMatches,
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checkClosure: checkClosure)
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}
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func containsOrderedSequence(minLength: UInt, orderingClosure: ((Int, Int) -> Bool)) -> Bool {
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recursivePairCheck(requiredMatches: minLength - 1) {
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guard let current = $0.intValue, let next = $1.intValue else {
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return false
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}
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return orderingClosure(current, next)
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}
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}
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}
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private extension Character {
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var intValue: Int? {
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return Int(String(self))
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}
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}
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extension String {
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func containsSequenceOfEqualCharacters(minEqualCharacters: UInt) -> Bool {
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Substring(self).recursivePairCheck(requiredMatches: minEqualCharacters - 1) { $0 == $1 }
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}
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func containsAscendingSequence(minLength: UInt) -> Bool {
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Substring(self).containsOrderedSequence(minLength: minLength) { $0 + 1 == $1 }
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}
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func containsDescendingSequence(minLength: UInt) -> Bool {
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Substring(self).containsOrderedSequence(minLength: minLength) { $0 - 1 == $1 }
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}
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}
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