diff --git a/headers/AST.h b/headers/AST.h
new file mode 100644
index 0000000..e69de29
diff --git a/src/Lexer.cpp b/src/Lexer.cpp
index 2901089..15a93c0 100644
--- a/src/Lexer.cpp
+++ b/src/Lexer.cpp
@@ -64,12 +64,14 @@ std::vector<Token> Lexer::Tokenize(std::string source){
             }
             else if(t == ' ' || t == '\t' || t == '\n')
             {
-                    src.erase(src.begin());
+                    src.erase(src.begin()); //ignore t
             }
             else
             {
                 throw std::runtime_error("Unknown Token: '" + std::string(1, t) + "'");
             }
+
+           
         }
         
     }
diff --git a/src/bob.cpp b/src/bob.cpp
index fc2879d..9bfb3c2 100644
--- a/src/bob.cpp
+++ b/src/bob.cpp
@@ -3,38 +3,83 @@
 #include <string>
 #include "../headers/Lexer.h"
 
+#define VERSION "0.0.1"
+
 using namespace std;
 
+class Bob
+{
+public:
+	Lexer lexer;
+
+public:
+	void runFile(string path)
+	{
+		ifstream file = ifstream(path); 
+	
+		string source = "";
+
+		if(file.is_open()){
+			source = string(istreambuf_iterator<char>(file), istreambuf_iterator<char>());
+		}
+		else
+		{
+			cout << "File not found" << endl;
+			return;
+		}
+
+		this->run(source);
+	}
+
+	void runPrompt()
+	{
+		cout << "Bob v" << VERSION << ", 2023" << endl;
+		for(;;)
+		{
+			string line;
+			cout << "-> ";
+			std::getline(std::cin, line);
+
+			if(std::cin.eof())
+			{
+				break;
+			}
+
+			this->run(line);
+		}
+	}
+	
+
+private:
+	bool hadError = false;
+
+private:
+	void run(string source)
+	{
+		vector<Token> tokens = lexer.Tokenize(source);
+
+		for(Token t : tokens){
+			cout << "{type: " << t.type << ", value: " << t.value << "}" << endl;
+		}
+	}
+};
 int main(){
 
-	string TokenTypeMappings[] = {
-		"Identifier",
-		"Number",
-		"Equals",
-		"OpenParen",
-		"CloseParen",
-		"BinaryOperator",
-		"TestKeyword"
-	};
-	Lexer l;
-
-	string path = "source.bob";
-	ifstream file = ifstream(path); 
+	// string TokenTypeMappings[] = {
+	// 	"Identifier",
+	// 	"Number",
+	// 	"Equals",
+	// 	"OpenParen",
+	// 	"CloseParen",
+	// 	"BinaryOperator",
+	// 	"TestKeyword"
+	// };
 	
-	string source = "";
+	Bob bobLang;
 
-	if(file.is_open()){
-		source = string(istreambuf_iterator<char>(file), istreambuf_iterator<char>());
-	}
-	else
-	{
-		cout << "File not found" << endl;
-	}
+	//bobLang.runFile("source.bob");
+	bobLang.runPrompt();
 
 
-	vector<Token> tokens = l.Tokenize(source);
-	for(Token t : tokens){
-		cout << "Type: " << TokenTypeMappings[t.type] << ", Value: " + t.value << endl;
-	}
 	return 0;
 }