Make a Char trait that provides some handy methods for Object::Char

types/src/char/mod.rs

@@ -7,6 +7,11 @@ mod names;
 use object::Object;
 use predicates::IsChar;
 
+pub trait Char {
+    fn from_char(c: char) -> Object;
+    fn from_char_named(name: &str) -> Option<Object>;
+    fn char_name(&self) -> Option<String>;
+}
 
 impl IsChar for Object {
     fn is_char(&self) -> bool {
@@ -17,20 +22,28 @@ impl IsChar for Object {
     }
 }
 
-impl Object {
-    pub fn from_char(c: char) -> Object {
+impl Char for Object {
+    fn from_char(c: char) -> Object {
         Object::Char(c)
     }
 
-    pub fn from_char_name(name: &str) -> Option<Object> {
+    fn from_char_named(name: &str) -> Option<Object> {
         names::char_for(name).map(|c| Object::from_char(c))
     }
+
+    fn char_name(&self) -> Option<String> {
+        match *self {
+            Object::Char(c) => Some(names::name_of(c).map_or(c.to_string(), String::from)),
+            _ => None,
+        }
+    }
 }
 
 #[cfg(test)]
 mod tests {
     use object::Object;
     use predicates::{IsBool, IsChar};
+    use super::Char;
 
     #[test]
     fn chars_are_chars() {
@@ -45,7 +58,14 @@ mod tests {
 
     #[test]
     fn named_chars_are_created() {
-        assert_eq!(Object::from_char_name("newline"), Some(Object::from_char('\n')));
-        assert_eq!(Object::from_char_name("asdf"), None);
+        assert_eq!(Object::from_char_named("newline"), Some(Object::from_char('\n')));
+        assert_eq!(Object::from_char_named("asdf"), None);
+    }
+
+    #[test]
+    fn chars_have_names() {
+        assert_eq!(Object::from_char('a').char_name(), Some(String::from("a")));
+        assert_eq!(Object::from_char('\n').char_name(), Some(String::from("newline")));
+        assert_eq!(Object::Bool(true).char_name(), None);
     }
 }