From 899ecea236288b5ebc7795c204fdad59b3276002 Mon Sep 17 00:00:00 2001
From: Tom Willemse
Date: Wed, 18 Nov 2020 23:30:46 -0800
Subject: Chapter 8: Add variable declarations

---
 src/com/craftinginterpreters/lox/Environment.java | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 src/com/craftinginterpreters/lox/Environment.java

(limited to 'src/com/craftinginterpreters/lox/Environment.java')

diff --git a/src/com/craftinginterpreters/lox/Environment.java b/src/com/craftinginterpreters/lox/Environment.java
new file mode 100644
index 0000000..634659b
--- /dev/null
+++ b/src/com/craftinginterpreters/lox/Environment.java
@@ -0,0 +1,20 @@
+package com.craftinginterpreters.lox;
+
+import java.util.HashMap;
+import java.util.Map;
+
+class Environment {
+    private final Map<String, Object> values = new HashMap<>();
+
+    Object get(Token name) {
+        if (values.containsKey(name.lexeme)) {
+            return values.get(name.lexeme);
+        }
+
+        throw new RuntimeError(name, "Undefined variable '" + name.lexeme + "'.");
+    }
+
+    void define(String name, Object value) {
+        values.put(name, value);
+    }
+}
-- 
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