Reserialize a game tree

go-sgf/Makefile

@@ -0,0 +1,6 @@
+
+test:
+	cargo watch -x 'nextest run'
+
+test-oneshot:
+	cargo nextest run

go-sgf/src/lib.rs

@@ -161,12 +161,6 @@ struct Node {
 }
 */
 
-#[derive(Debug, PartialEq)]
-pub struct Property {
-    ident: String,
-    values: Vec<String>,
-}
-
 enum PropType {
     Move,
     Setup,
@@ -193,11 +187,55 @@ struct Tree {
     sub_sequences: Vec<Tree>,
 }
 
+impl ToString for Tree {
+    fn to_string(&self) -> String {
+        let sequence = self
+            .sequence
+            .iter()
+            .map(|node| node.to_string())
+            .collect::<String>();
+        let subsequences = self
+            .sub_sequences
+            .iter()
+            .map(|seq| seq.to_string())
+            .collect::<String>();
+        format!("({}{})", sequence, subsequences)
+    }
+}
+
 #[derive(Debug, PartialEq)]
 struct Node {
     properties: Vec<Property>,
 }
 
+impl ToString for Node {
+    fn to_string(&self) -> String {
+        let props = self
+            .properties
+            .iter()
+            .map(|prop| prop.to_string())
+            .collect::<String>();
+        format!(";{}", props)
+    }
+}
+
+#[derive(Debug, PartialEq)]
+struct Property {
+    ident: String,
+    values: Vec<String>,
+}
+
+impl ToString for Property {
+    fn to_string(&self) -> String {
+        let values = self
+            .values
+            .iter()
+            .map(|val| format!("[{}]", val))
+            .collect::<String>();
+        format!("{}{}", self.ident, values)
+    }
+}
+
 // note: must preserve unknown properties
 // note: must fix or preserve illegally formatted game-info properties
 // note: must correct or delete illegally foramtted properties, but display a warning
@@ -475,6 +513,18 @@ Usually B plays the 3,3 invasion - see variation];W[qo];B[qp]
         assert_eq!(ex_tree.sub_sequences[0].sub_sequences.len(), 2);
     }
 
+    #[test]
+    fn it_can_regenerate_the_tree() {
+        let (_, tree1) = parse_tree(EXAMPLE_1).unwrap();
+        println!("{}", tree1.to_string());
+        assert_eq!(
+            tree1.to_string(),
+            "(;FF[4]C[root](;C[a];C[b](;C[c])(;C[d];C[e]))(;C[f](;C[g];C[h];C[i])(;C[j])))"
+        );
+        let (_, tree2) = parse_tree(&tree1.to_string()).unwrap();
+        assert_eq!(tree1, tree2);
+    }
+
     /*
     fn with_examples(f: impl FnOnce(GameTree, GameTree)) {
         let (example_1, _) = parse_sgf(EXAMPLE_1).unwrap();