From de1710b85691836c0ad0a7310e70fcb6169721d2 Mon Sep 17 00:00:00 2001
From: ShikiSuen <shikisuen@outlook.com>
Date: Sat, 10 Dec 2022 12:25:54 +0800
Subject: [PATCH] LMAssembly // Introduce LMRevLookup.

- This module is not supposed to be binded to LMInstantiator. Instead, use it when calling the reverse lookup window, and throw it after the window closes.
---
 .../SubLMs/lmRevLookup.swift                  | 68 +++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 Packages/vChewing_LangModelAssembly/Sources/LangModelAssembly/SubLMs/lmRevLookup.swift

diff --git a/Packages/vChewing_LangModelAssembly/Sources/LangModelAssembly/SubLMs/lmRevLookup.swift b/Packages/vChewing_LangModelAssembly/Sources/LangModelAssembly/SubLMs/lmRevLookup.swift
new file mode 100644
index 00000000..86642375
--- /dev/null
+++ b/Packages/vChewing_LangModelAssembly/Sources/LangModelAssembly/SubLMs/lmRevLookup.swift
@@ -0,0 +1,68 @@
+// (c) 2021 and onwards The vChewing Project (MIT-NTL License).
+// ====================
+// This code is released under the MIT license (SPDX-License-Identifier: MIT)
+// ... with NTL restriction stating that:
+// 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 defined in MIT License.
+
+import Foundation
+import Shared
+
+extension vChewingLM {
+  @frozen public struct LMRevLookup {
+    public private(set) var dataMap: [String: [Data]] = [:]
+    public private(set) var filePath: String = ""
+
+    public init(dataMap: [String: [Data]]) {
+      self.dataMap = dataMap
+    }
+
+    public init(path: String) {
+      if path.isEmpty { return }
+      do {
+        let rawData = try Data(contentsOf: URL(fileURLWithPath: path))
+        let rawPlist: [String: [Data]] =
+          try PropertyListSerialization.propertyList(from: rawData, format: nil) as? [String: [Data]] ?? .init()
+        dataMap = rawPlist
+      } catch {
+        vCLog("↑ Exception happened when reading plist file at: \(path).")
+        return
+      }
+      filePath = path
+    }
+
+    public func query(with kanji: String) -> [String]? {
+      guard let resultData = dataMap[kanji] else { return nil }
+      let resultArray = resultData.compactMap {
+        let result = restorePhonabetFromASCII(String(decoding: $0, as: UTF8.self))
+        return result.isEmpty ? nil : result
+      }
+      return resultArray.isEmpty ? nil : resultArray
+    }
+
+    /// 內部函式，用以將被加密的注音讀音索引鍵進行解密。
+    ///
+    /// 如果傳入的字串當中包含 ASCII 下畫線符號的話，則表明該字串並非注音讀音字串，會被忽略處理。
+    /// - parameters:
+    ///   - incoming: 傳入的已加密注音讀音字串。
+    func restorePhonabetFromASCII(_ incoming: String) -> String {
+      var strOutput = incoming
+      if !strOutput.contains("_") {
+        for entry in Self.dicPhonabet4ASCII {
+          strOutput = strOutput.replacingOccurrences(of: entry.key, with: entry.value)
+        }
+      }
+      return strOutput
+    }
+
+    // MARK: - Constants
+
+    static let dicPhonabet4ASCII: [String: String] = [
+      "b": "ㄅ", "p": "ㄆ", "m": "ㄇ", "f": "ㄈ", "d": "ㄉ", "t": "ㄊ", "n": "ㄋ", "l": "ㄌ", "g": "ㄍ", "k": "ㄎ", "h": "ㄏ",
+      "j": "ㄐ", "q": "ㄑ", "x": "ㄒ", "Z": "ㄓ", "C": "ㄔ", "S": "ㄕ", "r": "ㄖ", "z": "ㄗ", "c": "ㄘ", "s": "ㄙ", "i": "ㄧ",
+      "u": "ㄨ", "v": "ㄩ", "a": "ㄚ", "o": "ㄛ", "e": "ㄜ", "E": "ㄝ", "B": "ㄞ", "P": "ㄟ", "M": "ㄠ", "F": "ㄡ", "D": "ㄢ",
+      "T": "ㄣ", "N": "ㄤ", "L": "ㄥ", "R": "ㄦ", "2": "ˊ", "3": "ˇ", "4": "ˋ", "5": "˙",
+    ]
+  }
+}