Add Wait type.

src/lib.rs

@@ -9,6 +9,7 @@ pub use crate::{
     object_data_parser::{ObjectDataParser, Rule},
     pic::Pic,
     sprite_file::SpriteFile,
+    wait::Wait,
 };
 
 mod error;
@@ -19,3 +20,4 @@ mod object_data;
 mod object_data_parser;
 mod pic;
 mod sprite_file;
+mod wait;

src/wait.rs

@@ -0,0 +1,48 @@
+use std::{
+    fmt::{self, Display},
+    num::{NonZeroU32, ParseIntError},
+    ops::{Deref, DerefMut},
+    str::FromStr,
+};
+
+/// Default wait value of 1.
+pub const WAIT_DEFAULT: Wait = Wait(unsafe { NonZeroU32::new_unchecked(1) });
+
+/// Represents the frame number.
+#[derive(Clone, Copy, Debug)]
+pub struct Wait(pub NonZeroU32);
+
+impl Default for Wait {
+    fn default() -> Self {
+        WAIT_DEFAULT
+    }
+}
+
+impl Deref for Wait {
+    type Target = NonZeroU32;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl DerefMut for Wait {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.0
+    }
+}
+
+impl Display for Wait {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self.0)
+    }
+}
+
+impl FromStr for Wait {
+    type Err = ParseIntError;
+
+    fn from_str(s: &str) -> Result<Wait, ParseIntError> {
+        s.parse::<u32>()
+            .map(|wait| NonZeroU32::new(wait).map(Self).unwrap_or(WAIT_DEFAULT))
+    }
+}