67 lines
2.0 KiB
Swift
67 lines
2.0 KiB
Swift
/*
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* Copyright 2023 The Yorkie Authors. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import Foundation
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import Yorkie
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/**
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* TextView emulates an external editor like CodeMirror to test whether change
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* events are delivered properly.
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*/
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class TextView {
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private var value: String = ""
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public func applyChanges(changes: [TextChange], enableLog: Bool = false) {
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let oldValue = self.value
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var changeLogs = [String]()
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changes.forEach { change in
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if change.type == .content {
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self.value = [
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self.value.substring(from: 0, to: change.from - 1),
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change.content ?? "",
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self.value.substring(from: change.to, to: self.value.count - 1)
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].joined(separator: "")
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changeLogs.append("{f:\(change.from), t:\(change.to), c:\(change.content ?? "")}")
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}
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}
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if enableLog {
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print("apply: \(oldValue)->\(self.value) [\(changeLogs.joined(separator: ","))]")
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}
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}
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public var toString: String {
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self.value
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}
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}
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private extension String {
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func substring(from: Int, to: Int) -> String {
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guard from <= to, from < self.count, from >= 0 else {
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return ""
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}
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let adaptedTo = min(to, self.count - 1)
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let start = index(self.startIndex, offsetBy: from)
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let end = index(self.startIndex, offsetBy: adaptedTo)
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let range = start ... end
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return String(self[range])
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}
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}
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