From 6d874e78d9f2c1f3919dc4ae851a84c870f27dc2 Mon Sep 17 00:00:00 2001
From: ShikiSuen <shikisuen@outlook.com>
Date: Wed, 28 Dec 2022 14:43:16 +0800
Subject: [PATCH] LMAssembly // Introducing StringView Ranges Extension MK2.

Co-authored-by: IsaacXen <blackoutxen@gmail.com>
---
 .../LangModelAssembly/RangeParserAPI.swift    | 49 +++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 Packages/vChewing_LangModelAssembly/Sources/LangModelAssembly/RangeParserAPI.swift

diff --git a/Packages/vChewing_LangModelAssembly/Sources/LangModelAssembly/RangeParserAPI.swift b/Packages/vChewing_LangModelAssembly/Sources/LangModelAssembly/RangeParserAPI.swift
new file mode 100644
index 00000000..ca5c7d4b
--- /dev/null
+++ b/Packages/vChewing_LangModelAssembly/Sources/LangModelAssembly/RangeParserAPI.swift
@@ -0,0 +1,49 @@
+// (c) 2021 and onwards The vChewing Project (MIT-NTL License).
+// StringView Ranges extension by (c) 2022 and onwards Isaac Xen (MIT 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
+
+// MARK: - StringView Ranges Extension MK2
+
+// Credit: Isaac Xen (MK1) & Shiki Suen (MK2)
+
+extension String {
+  /// 分析傳入的原始辭典檔案（UTF-8 TXT）的資料。
+  /// - Parameters:
+  ///   - separator: 行內單元分隔符。
+  ///   - task: 要執行的外包任務。
+  func parse(
+    splitee separator: Element,
+    task: @escaping (_ theRange: Range<String.Index>) -> Void
+  ) {
+    var startIndex = startIndex
+    split(separator: separator).forEach { substring in
+      let theRange = range(of: substring, range: startIndex..<endIndex)
+      guard let theRange = theRange else { return }
+      task(theRange)
+      startIndex = theRange.upperBound
+    }
+  }
+}
+
+// MARK: - StringView Ranges Extension MK1 Backup (by Isaac Xen)
+
+// This is only for reference and is not used in this assembly.
+
+extension String {
+  fileprivate func ranges(splitBy separator: Element) -> [Range<String.Index>] {
+    var startIndex = startIndex
+    return split(separator: separator).reduce(into: []) { ranges, substring in
+      _ = range(of: substring, range: startIndex..<endIndex).map { range in
+        ranges.append(range)
+        startIndex = range.upperBound
+      }
+    }
+  }
+}