Add path utils to support StringView

Source/Engine/Core/Types/StringView.cpp

@@ -27,6 +27,18 @@ bool StringView::operator!=(const String& other) const
     return StringUtils::Compare(this->GetText(), *other) != 0;
 }
 
+String StringView::Left(int32 count) const
+{
+    const int32 countClamped = count < 0 ? 0 : count < Length() ? count : Length();
+    return String(**this, countClamped);
+}
+
+String StringView::Right(int32 count) const
+{
+    const int32 countClamped = count < 0 ? 0 : count < Length() ? count : Length();
+    return String(**this + Length() - countClamped);
+}
+
 String StringView::Substring(int32 startIndex) const
 {
     ASSERT(startIndex >= 0 && startIndex < Length());

Source/Engine/Core/Types/StringView.h

@@ -321,6 +321,20 @@ public:
 
 public:
 
+    /// <summary>
+    /// Gets the left most given number of characters.
+    /// </summary>
+    /// <param name="count">The characters count.</param>
+    /// <returns>The substring.</returns>
+    String Left(int32 count) const;
+
+    /// <summary>
+    /// Gets the string of characters from the right (end of the string).
+    /// </summary>
+    /// <param name="count">The characters count.</param>
+    /// <returns>The substring.</returns>
+    String Right(int32 count) const;
+
     /// <summary>
     /// Retrieves substring created from characters starting from startIndex to the String end.
     /// </summary>

Source/Engine/Platform/Base/StringUtilsBase.cpp

@@ -289,7 +289,7 @@ void RemoveLongPathPrefix(const String& path, String& result)
     result.Remove(2, 6);
 }
 
-String StringUtils::GetDirectoryName(const String& path)
+String StringUtils::GetDirectoryName(const StringView& path)
 {
     const int32 lastFrontSlash = path.FindLast('\\');
     const int32 lastBackSlash = path.FindLast('/');
@@ -297,24 +297,22 @@ String StringUtils::GetDirectoryName(const String& path)
     return splitIndex != INVALID_INDEX ? path.Left(splitIndex) : String::Empty;
 }
 
-String StringUtils::GetFileName(const String& path)
+String StringUtils::GetFileName(const StringView& path)
 {
     Char chr;
     const int32 length = path.Length();
     int32 num = length;
-
     do
     {
         num--;
         if (num < 0)
-            return path;
+            return String(path);
         chr = path[num];
     } while (chr != DirectorySeparatorChar && chr != AltDirectorySeparatorChar && chr != VolumeSeparatorChar);
-
     return path.Substring(num + 1, length - num - 1);
 }
 
-String StringUtils::GetFileNameWithoutExtension(const String& path)
+String StringUtils::GetFileNameWithoutExtension(const StringView& path)
 {
     String filename = GetFileName(path);
     const int32 num = filename.FindLast('.');
@@ -325,14 +323,14 @@ String StringUtils::GetFileNameWithoutExtension(const String& path)
     return filename;
 }
 
-String StringUtils::GetPathWithoutExtension(const String& path)
+String StringUtils::GetPathWithoutExtension(const StringView& path)
 {
     const int32 num = path.FindLast('.');
     if (num != -1)
     {
         return path.Substring(0, num);
     }
-    return path;
+    return String(path);
 }
 
 void StringUtils::PathRemoveRelativeParts(String& path)

Source/Engine/Platform/StringUtils.h

@@ -207,19 +207,19 @@ public:
     // Returns the directory name of the specified path string
     // @param path The path string from which to obtain the directory name
     // @returns Directory name
-    static String GetDirectoryName(const String& path);
+    static String GetDirectoryName(const StringView& path);
 
     // Returns the file name and extension of the specified path string
     // @param path The path string from which to obtain the file name and extension
     // @returns File name with extension
-    static String GetFileName(const String& path);
+    static String GetFileName(const StringView& path);
 
     // Returns the file name without extension of the specified path string
     // @param path The path string from which to obtain the file name
     // @returns File name without extension
-    static String GetFileNameWithoutExtension(const String& path);
+    static String GetFileNameWithoutExtension(const StringView& path);
 
-    static String GetPathWithoutExtension(const String& path);
+    static String GetPathWithoutExtension(const StringView& path);
 
     static void PathRemoveRelativeParts(String& path);