1 files changed, 28 insertions(+), 1 deletions(-)

M src/lib.rs

@@ 3,7 3,7 @@ mod matching;
 use std::{
     borrow::Cow,
     cmp::{max, min},
-    str,
+    fmt, str,
 };
 
 const SYMBOL_CHARS: &str = "\0abcdefghijklmnopqrstuvxyz+-*?0123456789";


@@ 245,6 245,33 @@ impl PartialEq<i64> for Lisp {
     }
 }
 
+impl fmt::Display for Lisp {
+    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+        match self {
+            Lisp::Int(x) => x.fmt(f),
+            Lisp::Float(x) => x.fmt(f),
+            Lisp::Symbol(x) => x.fmt(f),
+            Lisp::String(x) => fmt::Debug::fmt(x, f),
+            Lisp::List(xs) => {
+                write!(f, "(")?;
+                if let Some((xn, xs)) = xs.split_last() {
+                    for x in xs {
+                        write!(f, "{x} ")?
+                    }
+                    write!(f, "{xn}")?
+                }
+                write!(f, ")")
+            }
+        }
+    }
+}
+
+impl fmt::Display for Symbol {
+    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+        self.unpack_str().fmt(f)
+    }
+}
+
 #[cfg(test)]
 mod test {
     use super::*;