Draft generation of valid AI movements

board-shared/src/parser.rs

@@ -1,5 +1,6 @@
 use crate::lexer::Token;
 use crate::tile::Operator;
+use std::fmt;
 use std::iter::Peekable;
 
 #[derive(Debug, Clone, PartialEq, Eq)]
@@ -9,6 +10,18 @@ pub enum Expression {
     Binary(Operator, Box<Expression>, Box<Expression>),
 }
 
+impl fmt::Display for Expression {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Expression::Digit(value) => write!(f, "{}", value),
+            Expression::Parentheses(expr) => write!(f, "({})", expr),
+            Expression::Binary(operator, left, right) => {
+                write!(f, "{} {} {}", left, operator, right)
+            }
+        }
+    }
+}
+
 pub type Expressions = Vec<Expression>;
 
 pub fn parse(tokens: &[Token]) -> Result<Expressions, ()> {