From 1b4b4149a0da4ec14a6121d0d4899e2c221bcf41 Mon Sep 17 00:00:00 2001
From: ShikiSuen <shikisuen@outlook.com>
Date: Sun, 1 May 2022 12:17:37 +0800
Subject: [PATCH] LM // Swiftify: LMCore.

---
 .../LangModelRelated/SubLMs/lmCore.swift      | 168 ++++++++++++++++++
 1 file changed, 168 insertions(+)
 create mode 100644 Source/Modules/LangModelRelated/SubLMs/lmCore.swift

diff --git a/Source/Modules/LangModelRelated/SubLMs/lmCore.swift b/Source/Modules/LangModelRelated/SubLMs/lmCore.swift
new file mode 100644
index 00000000..0ee1cf8a
--- /dev/null
+++ b/Source/Modules/LangModelRelated/SubLMs/lmCore.swift
@@ -0,0 +1,168 @@
+// Copyright (c) 2021 and onwards The vChewing Project (MIT-NTL License).
+/*
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+1. The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+2. No trademark license is granted to use the trade names, trademarks, service
+marks, or product names of Contributor, except as required to fulfill notice
+requirements above.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+// 威注音重新設計原廠詞庫語言模組。不排序，但使用 Swift 內建的 String 處理。
+
+import Foundation
+
+extension vChewing {
+	public class LMCore {
+		var keyValueScoreMap: [String: [Megrez.Unigram]] = [:]
+		var theData: String = ""
+		var shouldReverse: Bool = false
+		var allowConsolidation: Bool = false
+		var defaultScore: Double = 0
+		var shouldForceDefaultScore: Bool = false
+
+		public init(
+			reverse: Bool = false, consolidate: Bool = false, defaultScore scoreDefault: Double = 0,
+			forceDefaultScore: Bool = false
+		) {
+			keyValueScoreMap = [:]
+			theData = ""
+			allowConsolidation = consolidate
+			shouldReverse = reverse
+			defaultScore = scoreDefault
+			shouldForceDefaultScore = forceDefaultScore
+		}
+
+		deinit {
+			if isLoaded() {
+				close()
+			}
+		}
+
+		public func isLoaded() -> Bool {
+			!keyValueScoreMap.isEmpty
+		}
+
+		@discardableResult public func open(_ path: String) -> Bool {
+			if isLoaded() {
+				return false
+			}
+
+			if allowConsolidation {
+				if !LMConsolidator.fixEOF(path: path) {
+					return false
+				}
+				if !LMConsolidator.consolidate(path: path, pragma: true) {
+					return false
+				}
+			}
+
+			do {
+				theData = try String(contentsOfFile: path, encoding: .utf8)
+			} catch {
+				IME.prtDebugIntel("\(error)")
+				IME.prtDebugIntel("↑ Exception happened when reading Associated Phrases data.")
+				return false
+			}
+
+			let length = theData.count
+			guard length > 0 else {
+				return false
+			}
+
+			let arrData = theData.components(separatedBy: "\n")
+			for (lineID, lineContent) in arrData.enumerated() {
+				if !lineContent.hasPrefix("#") {
+					let lineContent = lineContent.replacingOccurrences(of: "\t", with: " ")
+					if lineContent.components(separatedBy: " ").count < 2 {
+						if arrData.last != "" {
+							IME.prtDebugIntel("Line #\(lineID + 1) Wrecked: \(lineContent)")
+						}
+						continue
+					}
+					var currentUnigram = Megrez.Unigram(keyValue: Megrez.KeyValuePair(), score: defaultScore)
+					var columnOne = ""
+					var columnTwo = ""
+					for (unitID, unitContent) in lineContent.components(separatedBy: " ").enumerated() {
+						switch unitID {
+							case 0:
+								columnOne = unitContent
+							case 1:
+								columnTwo = unitContent
+							case 2:
+								if !shouldForceDefaultScore {
+									if let unitContentConverted = Double(unitContent) {
+										currentUnigram.score = unitContentConverted
+									} else {
+										IME.prtDebugIntel("Line #\(lineID) Score Data Wrecked: \(lineContent)")
+									}
+								}
+							default: break
+						}
+					}
+					let kvPair =
+						shouldReverse
+						? Megrez.KeyValuePair(key: columnTwo, value: columnOne)
+						: Megrez.KeyValuePair(key: columnOne, value: columnTwo)
+					currentUnigram.keyValue = kvPair
+					let key = shouldReverse ? columnTwo : columnOne
+					keyValueScoreMap[key, default: []].append(currentUnigram)
+				}
+			}
+			IME.prtDebugIntel("\(keyValueScoreMap.count) entries of data loaded from: \(path)")
+			theData = ""
+			return true
+		}
+
+		public func close() {
+			if isLoaded() {
+				keyValueScoreMap.removeAll()
+			}
+		}
+
+		// MARK: - Advanced features
+
+		public func dump() {
+			var strDump = ""
+			for entry in keyValueScoreMap {
+				let rows: [Megrez.Unigram] = entry.1
+				for row in rows {
+					let addline = row.keyValue.key + " " + row.keyValue.value + " " + String(row.score) + "\n"
+					strDump += addline
+				}
+			}
+			IME.prtDebugIntel(strDump)
+		}
+
+		open func bigramsForKeys(precedingKey: String, key: String) -> [Megrez.Bigram] {
+			// 這裡用了點廢話處理，不然函數構建體會被 Swift 格式整理工具給毀掉。
+			// 其實只要一句「[Megrez.Bigram]()」就夠了。
+			precedingKey == key ? [Megrez.Bigram]() : [Megrez.Bigram]()
+		}
+
+		open func unigramsFor(key: String) -> [Megrez.Unigram] {
+			keyValueScoreMap[key] ?? [Megrez.Unigram]()
+		}
+
+		open func hasUnigramsFor(key: String) -> Bool {
+			if let arrEntry = keyValueScoreMap[key] {
+				return !arrEntry.isEmpty
+			}
+			return false
+		}
+	}
+}