Implement SymbolTable

Author: leocassarani

lib/symbol_table.rb

@@ -1,2 +1,21 @@
-module SymbolTable
+class SymbolTable
+  def initialize
+    @symbols = Hash.new
+  end
+
+  def contains?(symbol)
+    symbols.key?(symbol)
+  end
+
+  def add_entry(symbol, address)
+    symbols[symbol] = address
+  end
+
+  def get_address(symbol)
+    symbols.fetch(symbol)
+  end
+
+  private
+
+  attr_reader :symbols
 end