Парсинг числовых значений

src/com/annimon/everlastingsummer/Parser.java

@@ -369,6 +369,9 @@ public final class Parser {
     
     private Expression primary() {
         final Token current = get(0);
+        if (match(current, TokenType.NUMBER)) {
+            return new ValueExpression( Double.parseDouble(current.getText()) );
+        }
         if (match(current, TokenType.WORD)) {
             return new VariableExpression(current.getText());
         }

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

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