mode.rs: Implement more traits for use in frontend

src/cpu/mode.rs

@@ -28,12 +28,37 @@ impl FromStr for Mode {
 
     fn from_str(s: &str) -> std::result::Result<Self, Self::Err> {
         match s.to_lowercase().as_str() {
-            "chip8" | "chip-8" => Ok(Mode::Chip8),
-            "schip" | "superchip" => Ok(Mode::SChip),
-            "xo-chip" | "xochip" => Ok(Mode::XOChip),
-            _ => Err(Error::InvalidMode {
-                mode: s.to_string(),
-            }),
+            "chip" | "chip8" | "chip-8" => Ok(Mode::Chip8),
+            "s" | "schip" | "superchip" | "super chip" => Ok(Mode::SChip),
+            "xo" | "xochip" | "xo-chip" => Ok(Mode::XOChip),
+            _ => Err(Error::InvalidMode { mode: s.into() }),
+        }
+    }
+}
+
+impl AsRef<str> for Mode {
+    fn as_ref(&self) -> &str {
+        match self {
+            Mode::Chip8 => "Chip-8",
+            Mode::SChip => "Super Chip",
+            Mode::XOChip => "XO-Chip",
+        }
+    }
+}
+
+impl ToString for Mode {
+    fn to_string(&self) -> String {
+        self.as_ref().into()
+    }
+}
+
+impl From<usize> for Mode {
+    fn from(value: usize) -> Self {
+        match value {
+            0 => Self::Chip8,
+            1 => Self::SChip,
+            2 => Self::XOChip,
+            _ => Self::Chip8,
         }
     }
 }