From 3aee3159e1a5bc86455e7155d22c3fe87f46c956 Mon Sep 17 00:00:00 2001
From: ShikiSuen <shikisuen@outlook.com>
Date: Fri, 14 Oct 2022 22:10:18 +0800
Subject: [PATCH] LMAssembly // Add a customized error.

---
 .../Sources/LangModelAssembly/LMConsolidator.swift          | 4 +++-
 .../Sources/LangModelAssembly/vChewingLM.swift              | 6 +++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/Packages/vChewing_LangModelAssembly/Sources/LangModelAssembly/LMConsolidator.swift b/Packages/vChewing_LangModelAssembly/Sources/LangModelAssembly/LMConsolidator.swift
index b169e376..2e90306b 100644
--- a/Packages/vChewing_LangModelAssembly/Sources/LangModelAssembly/LMConsolidator.swift
+++ b/Packages/vChewing_LangModelAssembly/Sources/LangModelAssembly/LMConsolidator.swift
@@ -19,8 +19,10 @@ extension vChewingLM {
     /// - Returns: 結果正常則為真，其餘為假。
     public static func checkPragma(path: String) -> Bool {
       if FileManager.default.fileExists(atPath: path) {
-        let fileHandle = FileHandle(forReadingAtPath: path)!
         do {
+          guard let fileHandle = FileHandle(forReadingAtPath: path) else {
+            throw FileErrors.fileHandleError("")
+          }
           let lineReader = try LineReader(file: fileHandle)
           for strLine in lineReader {  // 不需要 i=0，因為第一遍迴圈就出結果。
             if strLine != kPragmaHeader {
diff --git a/Packages/vChewing_LangModelAssembly/Sources/LangModelAssembly/vChewingLM.swift b/Packages/vChewing_LangModelAssembly/Sources/LangModelAssembly/vChewingLM.swift
index fbd8e731..8874e121 100644
--- a/Packages/vChewing_LangModelAssembly/Sources/LangModelAssembly/vChewingLM.swift
+++ b/Packages/vChewing_LangModelAssembly/Sources/LangModelAssembly/vChewingLM.swift
@@ -8,4 +8,8 @@
 
 import Foundation
 
-public enum vChewingLM {}
+public enum vChewingLM {
+  enum FileErrors: Error {
+    case fileHandleError(String)
+  }
+}