Improve case insensitive search (#111)

* Improve case insensitive search

* Extract methods to extension

Author: cyanzhong

MarkEditCore/Sources/Extensions/String+Extension.swift

@@ -20,6 +20,14 @@ public extension String {
   func toData(encoding: String.Encoding = .utf8) -> Data? {
     data(using: encoding)
   }
+
+  func equalsIgnoreCase(_ another: String) -> Bool {
+    caseInsensitiveCompare(another) == .orderedSame
+  }
+
+  func hasPrefixIgnoreCase(_ prefix: String) -> Bool {
+    range(of: prefix, options: [.anchored, .caseInsensitive]) != nil
+  }
 }
 
 extension String.Encoding {

MarkEditKit/Sources/Bridge/Native/Modules/EditorModuleCompletion.swift

@@ -44,7 +44,7 @@ public final class EditorModuleCompletion: NativeModuleCompletion {
     // Figure out the partial word range with one tokenization pass
     let from = range.lowerBound.utf16Offset(in: anchor.text)
     let to = range.upperBound.utf16Offset(in: anchor.text)
-    let prefix = anchor.text[range].trimmingCharacters(in: .whitespaces).lowercased()
+    let prefix = anchor.text[range].trimmingCharacters(in: .whitespaces)
 
     // Figure out all words in the document with more tokenization passes
     if let fullText, delegate?.editorCompletionTokenizeWholeDocument(self) == true {
@@ -57,7 +57,7 @@ public final class EditorModuleCompletion: NativeModuleCompletion {
       anchor: anchor,
       partialRange: NSRange(location: from, length: to - from),
       tokenizedWords: (cachedTokens + tokens(in: anchor.text)).filter {
-        $0.lowercased().hasPrefix(prefix)
+        $0.hasPrefixIgnoreCase(prefix)
       }
     )
   }

MarkEditMac/Sources/Editor/Controllers/EditorViewController+Completion.swift

@@ -27,8 +27,8 @@ extension EditorViewController {
 
     if AppPreferences.Assistant.wordsInDocument {
       // Remove tokens if they "cannot be completed", usually means they are not a word
-      let isWord = completions.contains { $0.lowercased() == prefix }
-      completions.append(contentsOf: tokenizedWords.filter { isWord || $0.lowercased() != prefix })
+      let isWord = completions.contains { $0.equalsIgnoreCase(prefix) }
+      completions.append(contentsOf: tokenizedWords.filter { isWord || $0 != prefix })
     }
 
     if AppPreferences.Assistant.standardWords {