UserPhrases // Implement .removeFromFilter() method, etc.
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ShikiSuen
parent
1cc2929d95
commit
ee11682edb
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@ -67,8 +67,24 @@ public extension LMMgr {
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}
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public func write(toFilter: Bool) -> Bool {
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guard isValid, LMMgr.chkUserLMFilesExist(inputMode) else { return false }
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guard isValid else {
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vCLog("UserPhrase.write(toFilter: \(toFilter.description)) Error: UserPhrase invalid.")
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return false
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}
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guard LMMgr.chkUserLMFilesExist(inputMode) else {
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vCLog("UserPhrase.write(toFilter: \(toFilter.description)) Error: UserLMFiles not exist.")
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return false
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}
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if !toFilter, isAlreadyFiltered {
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vCLog("START REMOVING THIS PHRASE FROM FILTER.")
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removeFromFilter()
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// 在整理過一遍之後，如果還是被排除的狀態的話，則證明語彙濾除清單檔案有格式問題、需要整理。
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// 這種情況下，先強制整理，再排除。
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if isAlreadyFiltered {
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removeFromFilter(forceConsolidate: true)
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}
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return !isAlreadyFiltered
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}
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/// 施工筆記：
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/// 有些使用者的語彙檔案已經過於龐大了（超過一千行），
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/// 每次寫入時都全文整理格式的話，會引發嚴重的效能問題。
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@ -80,11 +96,21 @@ public extension LMMgr {
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let dict = try FileManager.default.attributesOfItem(atPath: theURL.path)
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if let value = dict[FileAttributeKey.size] as? UInt64 { fileSize = value }
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} catch {
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vCLog("UserPhrase.write(toFilter: \(toFilter.description)) Error: Target file size is null.")
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return false
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}
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guard let fileSize = fileSize else {
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vCLog("UserPhrase.write(toFilter: \(toFilter.description)) Error: Target file size is null.")
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return false
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}
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guard var dataToInsert = "\(description)\n".data(using: .utf8) else {
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vCLog("UserPhrase.write(toFilter: \(toFilter.description)) Error: Failed from preparing insertion data.")
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return false
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}
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guard let writeFile = FileHandle(forUpdatingAtPath: theURL.path) else {
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vCLog("UserPhrase.write(toFilter: \(toFilter.description)) Error: Failed from initiating file handle.")
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return false
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}
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guard let fileSize = fileSize else { return false }
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guard var dataToInsert = "\(description)\n".data(using: .utf8) else { return false }
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guard let writeFile = FileHandle(forUpdatingAtPath: theURL.path) else { return false }
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defer { writeFile.closeFile() }
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if fileSize > 0 {
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writeFile.seek(toFileOffset: fileSize - 1)
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@ -96,5 +122,71 @@ public extension LMMgr {
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writeFile.write(dataToInsert)
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return true
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}
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/// 嘗試將該筆記錄從語彙濾除清單檔案內移除，但可能會因為語彙濾除清單檔案尚未整理的格式而失敗。
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///
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/// 原理：發現該當條目時，直接全部置換為 NULL（0x0）。這樣可以最小化磁碟寫入次數。
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/// （不然還得將當前位置後面的內容整個重新寫入。）
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/// - Parameter confirm: 再檢查一遍是否符合執行條件。不符合的話，就啥也不做。
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@discardableResult public func removeFromFilter(confirm: Bool = false, forceConsolidate: Bool = false) -> Bool {
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let debugOutput = NSMutableString()
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defer {
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if debugOutput.length > 0 { vCLog(debugOutput.description) }
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}
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if confirm {
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guard isValid else {
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debugOutput.append("removeFromFilter(): This user phrase pair is invalid. \(descriptionCells.prefix(2).joined(separator: " "))")
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return false
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}
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guard isAlreadyFiltered else {
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debugOutput.append("removeFromFilter(): This user phrase pair is not in the filtered list.")
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return false
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}
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}
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let theURL = LMMgr.userDictDataURL(mode: inputMode, type: .theFilter)
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if forceConsolidate, !vChewingLM.LMConsolidator.consolidate(path: theURL.path, pragma: false) { return false }
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// Get FileSize.
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var fileSize: UInt64?
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do {
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let dict = try FileManager.default.attributesOfItem(atPath: theURL.path)
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if let value = dict[FileAttributeKey.size] as? UInt64 { fileSize = value }
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} catch {
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debugOutput.append("removeFromFilter(): Failed from getting the file size of the filter list file.")
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return false
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}
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guard let fileSize = fileSize else { return false }
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// Prepare FileHandle.
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guard let fileHandle = FileHandle(forUpdatingAtPath: theURL.path) else {
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debugOutput.append("removeFromFilter(): Failed from handling the filter list file.")
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return false
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}
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defer { fileHandle.closeFile() }
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// Get bytes for matching.
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let usefulCells = descriptionCells.prefix(2)
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guard usefulCells.count == 2 else { return false }
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guard let data1 = usefulCells.joined(separator: " ").data(using: .utf8) else { return false }
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guard let data2 = usefulCells.joined(separator: "\t").data(using: .utf8) else { return false }
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let bufferLength = data1.count // data1 與 data2 長度相等
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guard fileSize >= bufferLength else { return true }
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let blankData = Data([UInt8](repeating: 0x0, count: bufferLength)) // 用來搞填充的垃圾資料
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let sharpData = Data([0x23]) // Sharp Sign (#)
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fileHandle.seek(toFileOffset: 0) // 從頭開始讀取處理。
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for currentOffset in -1 ..< (Int(fileSize) - bufferLength - 1) {
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/// !! 注意：FileHandle 的 seek 位置會在每次 readData() / write() 之後都有變動。
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// 確定手術位置
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let currentWorkingOffset = UInt64(currentOffset + 1)
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// 讀取且檢查當前位元組
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fileHandle.seek(toFileOffset: UInt64(max(0, currentOffset)))
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let currentByte = fileHandle.readData(ofLength: 1)
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guard currentByte != sharpData else { continue }
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// 開始手術
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fileHandle.seek(toFileOffset: currentWorkingOffset)
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let dataScoped = fileHandle.readData(ofLength: bufferLength)
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guard [data1, data2].contains(dataScoped) else { continue }
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fileHandle.seek(toFileOffset: currentWorkingOffset)
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fileHandle.write(blankData)
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}
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return true
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}
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}
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}
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