Добавлен VariableExpression

src/com/annimon/everlastingsummer/ast/VariableExpression.java

@@ -0,0 +1,18 @@
+package com.annimon.everlastingsummer.ast;
+
+/**
+ * @author aNNiMON
+ */
+public class VariableExpression implements Expression {
+
+    private final String variable;
+    
+    public VariableExpression(String variable) {
+        this.variable = variable;
+    }
+
+    @Override
+    public double eval() {
+        return Variables.getVariable(variable);
+    }
+}