diff --git a/centvrion/__init__.py b/centvrion/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/ast_nodes.py b/centvrion/ast_nodes.py
similarity index 98%
rename from ast_nodes.py
rename to centvrion/ast_nodes.py
index bf0f520..821f3bd 100644
--- a/ast_nodes.py
+++ b/centvrion/ast_nodes.py
@@ -1,7 +1,7 @@
 import random
 import roman
 
-from rply.token import BaseBox
+from rply.token import BaseBox as BB
 
 NUMERALS = [
     ("I", 1),
@@ -37,6 +37,10 @@ def make_string(n):
     else:
         raise Exception(n)
 
+class BaseBox(BB):
+    def eval(self, vtable, ftable, modules):
+        return None
+
 class ExpressionStatement(BaseBox):
     def __init__(self, expression) -> None:
         self.expression = expression
@@ -373,7 +377,7 @@ class Program(BaseBox):
         statements_string = f"statements([{rep_join(self.statements)}])"
         return f"{modules_string},\n{statements_string}"
 
-    def eval(self):
+    def eval(self, *_):
         vtable = {"ERVMPE": False}
         ftable = {}
         modules = [module.module_name for module in self.modules]
diff --git a/lexer.py b/centvrion/lexer.py
similarity index 100%
rename from lexer.py
rename to centvrion/lexer.py
diff --git a/parser.py b/centvrion/parser.py
similarity index 97%
rename from parser.py
rename to centvrion/parser.py
index 80ece8a..8767319 100644
--- a/parser.py
+++ b/centvrion/parser.py
@@ -1,8 +1,7 @@
-from multiprocessing.dummy import Array
 from rply import ParserGenerator
 
-from lexer import all_tokens
-import ast_nodes
+from centvrion.lexer import all_tokens
+from . import ast_nodes
 
 ALL_TOKENS = list(set([i[0] for i in all_tokens]))
 
@@ -17,7 +16,7 @@ class Parser():
             ]
         )
 
-    def parse(self):
+    def parse(self, tokens_input) -> ast_nodes.BaseBox:
         @self.pg.production('program : opt_newline module_calls statements')
         def program(tokens):
             return ast_nodes.Program(tokens[-2], tokens[-1])
@@ -181,6 +180,5 @@ class Parser():
         def error_handle(token):
             raise ValueError(token)
 
-
-    def get_parser(self):
-        return self.pg.build()
+        parser = self.pg.build()
+        return parser.parse(tokens_input)
diff --git a/main.py b/main.py
index e71910c..60e4844 100644
--- a/main.py
+++ b/main.py
@@ -1,5 +1,5 @@
-from lexer import Lexer
-from parser import Parser
+from centvrion.lexer import Lexer
+from centvrion.parser import Parser
 
 text_input = """
 VOCA FORS
@@ -22,14 +22,12 @@ DICE "You guessed correctly!"
 """
 
 lexer = Lexer().get_lexer()
-pg = Parser()
-pg.parse()
-parser = pg.get_parser()
+parser = Parser()
 
 tokens = lexer.lex(text_input)
 #for token in tokens:
 #    print(token)
 
-x = parser.parse(tokens)
+program = parser.parse(tokens)
 #print(x)
-x.eval()
+program.eval()