Chapter 12, Sections 1, 2, and 3

1 files changed, 30 insertions, 0 deletions

diff --git a/src/com/craftinginterpreters/lox/LoxInstance.java b/src/com/craftinginterpreters/lox/LoxInstance.java
new file mode 100644
index 0000000..4e5eb9e
--- /dev/null
+++ b/src/com/craftinginterpreters/lox/LoxInstance.java
@@ -0,0 +1,30 @@
+package com.craftinginterpreters.lox;
+
+import java.util.HashMap;
+import java.util.Map;
+
+class LoxInstance {
+    private LoxClass klass;
+    private final Map<String, Object> fields = new HashMap<>();
+
+    LoxInstance(LoxClass klass) {
+        this.klass = klass;
+    }
+
+    Object get(Token name) {
+        if (fields.containsKey(name.lexeme)) {
+            return fields.get(name.lexeme);
+        }
+
+        throw new RuntimeError(name, "Undefined proprety '" + name.lexeme + "'.");
+    }
+
+    void set(Token name, Object value) {
+        fields.put(name.lexeme, value);
+    }
+
+    @Override
+    public String toString() {
+        return klass.name + " instance";
+    }
+}