From da92f38ad71ab43f8ade8e3f3304688c66a5b55f Mon Sep 17 00:00:00 2001
From: ShikiSuen <shikisuen@outlook.com>
Date: Wed, 22 Jun 2022 08:38:42 +0800
Subject: [PATCH] LMSymbolNode // Parsing symbols.dat file from LibChewing.

---
 .../LangModelRelated/LMSymbolNode.swift       | 32 ++++++++++++++++++-
 .../LangModelRelated/mgrLangModel.swift       |  6 ++++
 2 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/Source/Modules/LangModelRelated/LMSymbolNode.swift b/Source/Modules/LangModelRelated/LMSymbolNode.swift
index 7226b28e..62c7b53d 100644
--- a/Source/Modules/LangModelRelated/LMSymbolNode.swift
+++ b/Source/Modules/LangModelRelated/LMSymbolNode.swift
@@ -40,6 +40,34 @@ class SymbolNode {
     children = Array(symbols).map { SymbolNode(String($0), nil) }
   }
 
+  static func parseUserSymbolNodeData() {
+    let path = mgrLangModel.userSymbolNodeDataPath()
+    // 這兩個變數單獨拿出來，省得每次都重建還要浪費算力。
+    var arrLines = [String.SubSequence]()
+    var fieldSlice = [Substring.SubSequence]()
+    var arrChildren = [SymbolNode]()
+    do {
+      arrLines = try String(contentsOfFile: path, encoding: .utf8).split(separator: "\n")
+      for strLine in arrLines.lazy.filter({ !$0.isEmpty }) {
+        fieldSlice = strLine.split(separator: "=")
+        switch fieldSlice.count {
+          case 1: arrChildren.append(.init(String(fieldSlice[0])))
+          case 2: arrChildren.append(.init(String(fieldSlice[0]), symbols: .init(fieldSlice[1])))
+          default: break
+        }
+      }
+      if arrChildren.isEmpty {
+        root = defaultSymbolRoot
+      } else {
+        root = .init("/", arrChildren)
+      }
+    } catch {
+      root = defaultSymbolRoot
+    }
+  }
+
+  // MARK: - Static data.
+
   static let catCommonSymbols = String(
     format: NSLocalizedString("catCommonSymbols", comment: ""))
   static let catHoriBrackets = String(
@@ -71,7 +99,9 @@ class SymbolNode {
   static let catLineSegments = String(
     format: NSLocalizedString("catLineSegments", comment: ""))
 
-  static let root: SymbolNode = .init(
+  private(set) static var root: SymbolNode = .init("/")
+
+  private static let defaultSymbolRoot: SymbolNode = .init(
     "/",
     [
       SymbolNode("｀"),
diff --git a/Source/Modules/LangModelRelated/mgrLangModel.swift b/Source/Modules/LangModelRelated/mgrLangModel.swift
index 94111119..cfca4346 100644
--- a/Source/Modules/LangModelRelated/mgrLangModel.swift
+++ b/Source/Modules/LangModelRelated/mgrLangModel.swift
@@ -158,6 +158,7 @@ enum mgrLangModel {
     )
     gLangModelCHT.loadUserSymbolData(path: userSymbolDataPath(InputMode.imeModeCHT))
     gLangModelCHS.loadUserSymbolData(path: userSymbolDataPath(InputMode.imeModeCHS))
+    SymbolNode.parseUserSymbolNodeData()
   }
 
   public static func loadUserAssociatesData() {
@@ -244,6 +245,11 @@ enum mgrLangModel {
     return URL(fileURLWithPath: dataFolderPath(isDefaultFolder: false)).appendingPathComponent(fileName).path
   }
 
+  static func userSymbolNodeDataPath() -> String {
+    let fileName = "symbols.dat"
+    return URL(fileURLWithPath: dataFolderPath(isDefaultFolder: false)).appendingPathComponent(fileName).path
+  }
+
   // MARK: - 檢查具體的使用者語彙檔案是否存在
 
   static func ensureFileExists(