diff --git a/src/Basic.py b/src/Basic.py
new file mode 100644
index 0000000..9745710
--- /dev/null
+++ b/src/Basic.py
@@ -0,0 +1,223 @@
+from sly import Lexer
+from sly import Parser
+
+
+class BasicLexer(Lexer):
+    tokens = {NAME, NUMBER, STRING, IF, THEN, ELSE, FOR, FUN, TO, ARROW, EQEQ}
+    ignore = '\t '
+
+    literals = {'=', '+', '-', '/', '*', '(', ')', ',', ';'}
+
+    # Define tokens
+    IF = r'IF'
+    THEN = r'THEN'
+    ELSE = r'ELSE'
+    FOR = r'FOR'
+    FUN = r'FUN'
+    TO = r'TO'
+    ARROW = r'->'
+    NAME = r'[a-zA-Z_][a-zA-Z0-9_]*'
+    STRING = r'\".*?\"'
+
+    EQEQ = r'=='
+
+    @_(r'\d+')
+    def NUMBER(self, t):
+        t.value = int(t.value)
+        return t
+
+    @_(r'#.*')
+    def COMMENT(self, t):
+        pass
+
+    @_(r'\n+')
+    def newline(self, t):
+        self.lineno = t.value.count('\n')
+
+
+class BasicParser(Parser):
+    tokens = BasicLexer.tokens
+
+    precedence = (
+        ('left', '+', '-'),
+        ('left', '*', '/'),
+        ('right', 'UMINUS'),
+    )
+
+    def __init__(self):
+        self.env = {}
+
+    @_('')
+    def statement(self, p):
+        pass
+
+    @_('FOR var_assign TO expr THEN statement')
+    def statement(self, p):
+        return ('for_loop', ('for_loop_setup', p.var_assign, p.expr), p.statement)
+
+    @_('IF condition THEN statement ELSE statement')
+    def statement(self, p):
+        return ('if_stmt', p.condition, ('branch', p.statement0, p.statement1))
+
+    @_('FUN NAME "(" ")" ARROW statement')
+    def statement(self, p):
+        return ('fun_def', p.NAME, p.statement)
+
+    @_('NAME "(" ")"')
+    def statement(self, p):
+        return ('fun_call', p.NAME)
+
+    @_('expr EQEQ expr')
+    def condition(self, p):
+        return ('condition_eqeq', p.expr0, p.expr1)
+
+    @_('var_assign')
+    def statement(self, p):
+        return p.var_assign
+
+    @_('NAME "=" expr')
+    def var_assign(self, p):
+        return ('var_assign', p.NAME, p.expr)
+
+    @_('NAME "=" STRING')
+    def var_assign(self, p):
+        return ('var_assign', p.NAME, p.STRING)
+
+    @_('expr')
+    def statement(self, p):
+        return (p.expr)
+
+    @_('expr "+" expr')
+    def expr(self, p):
+        return ('add', p.expr0, p.expr1)
+
+    @_('expr "-" expr')
+    def expr(self, p):
+        return ('sub', p.expr0, p.expr1)
+
+    @_('expr "*" expr')
+    def expr(self, p):
+        return ('mul', p.expr0, p.expr1)
+
+    @_('expr "/" expr')
+    def expr(self, p):
+        return ('div', p.expr0, p.expr1)
+
+    @_('"-" expr %prec UMINUS')
+    def expr(self, p):
+        return p.expr
+
+    @_('NAME')
+    def expr(self, p):
+        return ('var', p.NAME)
+
+    @_('NUMBER')
+    def expr(self, p):
+        return ('num', p.NUMBER)
+
+
+class BasicExecute:
+
+    def __init__(self, tree, env):
+        self.env = env
+        result = self.walkTree(tree)
+        if result is not None and isinstance(result, int):
+            print(result)
+        if isinstance(result, str) and result[0] == '"':
+            print(result)
+
+    def walkTree(self, node):
+
+        if isinstance(node, int):
+            return node
+        if isinstance(node, str):
+            return node
+
+        if node is None:
+            return None
+
+        if node[0] == 'program':
+            if node[1] == None:
+                self.walkTree(node[2])
+            else:
+                self.walkTree(node[1])
+                self.walkTree(node[2])
+
+        if node[0] == 'num':
+            return node[1]
+
+        if node[0] == 'str':
+            return node[1]
+
+        if node[0] == 'if_stmt':
+            result = self.walkTree(node[1])
+            if result:
+                return self.walkTree(node[2][1])
+            return self.walkTree(node[2][2])
+
+        if node[0] == 'condition_eqeq':
+            return self.walkTree(node[1]) == self.walkTree(node[2])
+
+        if node[0] == 'fun_def':
+            self.env[node[1]] = node[2]
+
+        if node[0] == 'fun_call':
+            try:
+                return self.walkTree(self.env[node[1]])
+            except LookupError:
+                print("Undefined function '%s'" % node[1])
+                return 0
+
+        if node[0] == 'add':
+            return self.walkTree(node[1]) + self.walkTree(node[2])
+        elif node[0] == 'sub':
+            return self.walkTree(node[1]) - self.walkTree(node[2])
+        elif node[0] == 'mul':
+            return self.walkTree(node[1]) * self.walkTree(node[2])
+        elif node[0] == 'div':
+            return self.walkTree(node[1]) / self.walkTree(node[2])
+
+        if node[0] == 'var_assign':
+            self.env[node[1]] = self.walkTree(node[2])
+            return node[1]
+
+        if node[0] == 'var':
+            try:
+                return self.env[node[1]]
+            except LookupError:
+                print("Undefined variable '" + node[1] + "' found!")
+                return 0
+
+        if node[0] == 'for_loop':
+            if node[1][0] == 'for_loop_setup':
+                loop_setup = self.walkTree(node[1])
+
+                loop_count = self.env[loop_setup[0]]
+                loop_limit = loop_setup[1]
+
+                for i in range(loop_count + 1, loop_limit + 1):
+                    res = self.walkTree(node[2])
+                    if res is not None:
+                        print(res)
+                    self.env[loop_setup[0]] = i
+                del self.env[loop_setup[0]]
+
+        if node[0] == 'for_loop_setup':
+            return (self.walkTree(node[1]), self.walkTree(node[2]))
+
+
+if __name__ == '__main__':
+    lexer = BasicLexer()
+    parser = BasicParser()
+    env = {}
+    while True:
+        try:
+            text = input('basic > ')
+        except EOFError:
+            break
+        if text:
+            tokens = lexer.tokenize(text)
+            tree = parser.parse(tokens)
+            for t in tree:
+                print(t)
+            # BasicExecute(tree, env)
diff --git a/src/CCLang/Interpreter.py b/src/CCLang/Interpreter.py
new file mode 100644
index 0000000..edbb29a
--- /dev/null
+++ b/src/CCLang/Interpreter.py
@@ -0,0 +1,31 @@
+from typing import Optional
+
+from CCLang.Parser import Parser
+from Interpreter.Validator import Validator
+from CCLang.Lexer import Lexer
+from Interpreter.Repo import Repo
+from Interpreter.Utils import Utils
+from Models.AbstractSyntaxTree.AbstractSyntaxTree import AbstractSyntaxTree
+
+
+class Interpreter:
+
+    def __init__(self, repo: Repo, utils: Utils) -> None:
+        self.__repo = repo
+        self.__utils = utils
+        # self.__lexer = Lexer(repo, utils)
+        # self.__parser = Parser(repo, utils)
+        # self.__validator = Validator(repo, utils)
+
+    def interpret(self, line_str: str) -> None:
+        """
+        Interprets code line
+        :param line_str:
+        :return:
+        """
+        lexer = Lexer()
+        parser = Parser()
+        env = {}
+        ast = parser.parse(lexer.tokenize(line_str))
+        if ast is not None:
+            print(ast)
diff --git a/src/CCLang/Lexer.py b/src/CCLang/Lexer.py
new file mode 100644
index 0000000..06cdd1e
--- /dev/null
+++ b/src/CCLang/Lexer.py
@@ -0,0 +1,108 @@
+from sly import Lexer as SlyLexer
+
+from Models.CCLang.TokenDefinition import TokenDefinition
+
+
+class Lexer(SlyLexer):
+    # Ignored pattern
+    ignore = '\t '
+    # ignore_comment = r'(/\*([^*]|[\r\n]|(\*+([^*/]|[\r\n])))*\*+/)|(//.*)|([#].*)'
+    ignore_comment = r'([#].*|(//.*))'
+    ignore_newline = r'\n+'
+
+    tokens = {
+        LIBRARY,
+        CLASS,
+        FUNCTION,
+        VARIABLE,
+        USE,
+        FROM,
+        OUTPUT,
+        INPUT,
+        LENGTH,
+        RANGE,
+        EXIT,
+        IF,
+        ELSEIF,
+        ELSE,
+        CONTINUE,
+        IN,
+        RETURN,
+        WHILE,
+        FOR,
+        PUBLIC,
+        THIS,
+        LBRACE,
+        RBRACE,
+        LPARAN,
+        RPARAN,
+        LBRACKET,
+        RBRACKET,
+        SEMICOLON,
+        COLON,
+        COMMA,
+        POINT,
+        PLUS,
+        MINUS,
+        ASTERIK,
+        SLASH,
+        EQUAL,
+        CARET,
+        TRUE,
+        FALSE,
+        STRING,
+        NUMBER,
+        EMPTY,
+
+        NAME
+    }
+
+    # token definition
+    LIBRARY = TokenDefinition.Library.value
+    CLASS = TokenDefinition.Class.value
+    FUNCTION = TokenDefinition.Function.value
+    VARIABLE = TokenDefinition.Variable.value
+    USE = TokenDefinition.Use.value
+    FROM = TokenDefinition.From.value
+    OUTPUT = TokenDefinition.Output.value
+    INPUT = TokenDefinition.Input.value
+    LENGTH = TokenDefinition.Length.value
+    RANGE = TokenDefinition.Range.value
+    EXIT = TokenDefinition.Exit.value
+    IF = TokenDefinition.If.value
+    ELSEIF = TokenDefinition.ElseIf.value
+    ELSE = TokenDefinition.Else.value
+    CONTINUE = TokenDefinition.Continue.value
+    IN = TokenDefinition.In.value
+    RETURN = TokenDefinition.Return.value
+    WHILE = TokenDefinition.While.value
+    FOR = TokenDefinition.For.value
+    PUBLIC = TokenDefinition.Public.value
+    THIS = TokenDefinition.This.value
+    LBRACE = TokenDefinition.Left_Brace.value
+    RBRACE = TokenDefinition.Right_Brace.value
+    LPARAN = TokenDefinition.Left_Parenthesis.value
+    RPARAN = TokenDefinition.Right_Parenthesis.value
+    LBRACKET = TokenDefinition.Left_Bracket.value
+    RBRACKET = TokenDefinition.Right_Bracket.value
+    SEMICOLON = TokenDefinition.Semicolon.value
+    COLON = TokenDefinition.Colon.value
+    COMMA = TokenDefinition.Comma.value
+    POINT = TokenDefinition.Point.value
+    PLUS = TokenDefinition.Plus.value
+    MINUS = TokenDefinition.Minus.value
+    ASTERIK = TokenDefinition.Asterisk.value
+    SLASH = TokenDefinition.Slash.value
+    EQUAL = TokenDefinition.Equal.value
+    CARET = TokenDefinition.Caret.value
+    TRUE = TokenDefinition.BoolTrue.value
+    FALSE = TokenDefinition.BoolFalse.value
+    STRING = TokenDefinition.String.value
+    NUMBER = TokenDefinition.Number.value
+    EMPTY = TokenDefinition.Empty.value
+
+    NAME = TokenDefinition.Name.value
+
+    def error(self, t):
+        print("Illegal character '%s'" % t.value[0])
+        # self.index += 1
diff --git a/src/CCLang/Parser.py b/src/CCLang/Parser.py
new file mode 100644
index 0000000..ddaea80
--- /dev/null
+++ b/src/CCLang/Parser.py
@@ -0,0 +1,61 @@
+from sly import Parser as SlyParser
+
+from CCLang.Lexer import Lexer
+
+
+class Parser(SlyParser):
+    tokens = Lexer.tokens
+
+    #precedence = (
+    #    ('left', '+', '-'),
+    #    ('left', '*', '/'),
+    #    ('right', 'UMINUS'),
+    #)
+
+    def __init__(self):
+        self.env = {}
+
+    @_('')
+    def statement(self, p):
+        pass
+
+    def error(self, p):
+        print(f'ERROR: {p}')
+        pass
+
+    # lib definition
+    @_('PUBLIC LIBRARY NAME LBRACE')
+    def statement(self, p):
+        return ('lib_def', p.NAME, True)
+
+    @_('LIBRARY NAME LBRACE')
+    def statement(self, p):
+        return ('lib_def', p.NAME, False)
+
+    # class definition
+    @_('PUBLIC CLASS NAME LBRACE')
+    def statement(self, p):
+        return ('class_def', p.NAME, True)
+
+    @_('CLASS NAME LBRACE')
+    def statement(self, p):
+        return ('class_def', p.NAME, False)
+
+    # func definition
+    @_('PUBLIC FUNCTION NAME LPARAN statement RPARAN COLON type LBRACE')
+    def statement(self, p):
+        return ('func_def', p.NAME, True)
+
+    @_('FUNCTION NAME LPARAN RPARAN COLON type LBRACE')
+    def statement(self, p):
+        return ('func_def', p.NAME, False)
+
+    # types
+    @_('EMPTY')
+    def type(self, p):
+        return ('type', p.EMPTY)
+
+    # right brace
+    @_('RBRACE')
+    def statement(self, p):
+        return ('end', p.RBRACE)
diff --git a/src/CCLang/__init__.py b/src/CCLang/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/First.bl b/src/First.cc
similarity index 93%
rename from src/First.bl
rename to src/First.cc
index a034ffd..cac1b3e 100644
--- a/src/First.bl
+++ b/src/First.cc
@@ -1,8 +1,5 @@
-// hi1
-# hi2
-/*
-    hi3
-*/
+# hi1
+// hi2
 
 public lib Main {
     class Program {
diff --git a/src/Interpreter/Interpreter.py b/src/Interpreter/Interpreter.py
index ea3169c..ce3a1d9 100644
--- a/src/Interpreter/Interpreter.py
+++ b/src/Interpreter/Interpreter.py
@@ -2,7 +2,6 @@ from typing import Optional
 
 from Interpreter.Validator import Validator
 from Interpreter.Lexer import Lexer
-# from Interpreter.Parser_Old import Parser
 from Interpreter.Parser import Parser
 from Interpreter.Repo import Repo
 from Interpreter.Utils import Utils
@@ -27,10 +26,10 @@ class Interpreter:
         tokens = []
         ast: Optional[AbstractSyntaxTree] = None
 
-        if self.__repo.is_error is None:
+        if self.__repo.error is None:
             tokens = self.__lexer.tokenize(line_str)
 
-        if self.__repo.is_error is None:
+        if self.__repo.error is None:
             ast = self.__parser.parse(tokens)
 
         """ print('#####\n')
diff --git a/src/Interpreter/Repo.py b/src/Interpreter/Repo.py
index 29e12d8..0e2b83c 100644
--- a/src/Interpreter/Repo.py
+++ b/src/Interpreter/Repo.py
@@ -70,4 +70,4 @@ class Repo:
         self.bool_values = [Booleans.Right.value, Booleans.Wrong.value]
 
         # runtime
-        self.is_error = None
+        self.error = None
diff --git a/src/Interpreter/Utils.py b/src/Interpreter/Utils.py
index a35b03c..2697291 100644
--- a/src/Interpreter/Utils.py
+++ b/src/Interpreter/Utils.py
@@ -16,6 +16,11 @@ class Utils:
         print(f'-> {text}')
 
     def error(self, error: Error) -> None:
-        self.__repo.is_error = error
-        print(colored(f'Error in line {self.__repo.line_number}\n{self.__repo.is_error.msg}', 'red'))
+        self.__repo.error = error
+        print(colored(f'Error in line {self.__repo.line_number}\n{self.__repo.error.msg}', 'red'))
+        # exit()
+
+    def runtime_error(self, error: Error) -> None:
+        self.__repo.error = error
+        print(colored(f'{self.__repo.error.msg}', 'red'))
         # exit()
diff --git a/src/Models/CCLang/TokenDefinition.py b/src/Models/CCLang/TokenDefinition.py
new file mode 100644
index 0000000..bdb0fa3
--- /dev/null
+++ b/src/Models/CCLang/TokenDefinition.py
@@ -0,0 +1,67 @@
+from enum import Enum
+
+
+class TokenDefinition(Enum):
+    """ Keywords """
+    # define keywords
+    Library = r'lib'
+    Class = r'class'
+    Function = r'func'
+    Variable = r'var'
+    Use = r'use'
+    From = r'from'
+
+    # builtin functions
+    Output = r'output'
+    Input = r'input'
+    Length = r'length'
+    Range = r'range'
+    Exit = r'exit'
+
+    # normal keywords
+    If = r'if'
+    ElseIf = r'elseif'
+    Else = r'else'
+    Continue = r'continue'
+    In = r'in'
+    Return = r'return'
+
+    # loops
+    While = r'while'
+    For = r'for'
+
+    # access
+    Public = r'public'
+    This = r'this'
+
+    """ Chars """
+    # format
+    Left_Brace = r'\{'
+    Right_Brace = r'\}'
+    Left_Parenthesis = r'\('
+    Right_Parenthesis = r'\)'
+    Left_Bracket = r'\['
+    Right_Bracket = r'\]'
+    Semicolon = r'\;'
+    Colon = r'\:'
+    Comma = r'\,'
+    Point = r'\.'
+    # expr
+    Plus = r'\+'
+    Minus = r'\-'
+    Asterisk = r'\*'
+    Slash = r'\/'
+    Equal = r'\='
+    Caret = r'\^'
+
+    """ Values """
+    # bool
+    BoolTrue = r'true'
+    BoolFalse = r'false'
+
+    Name = r'[a-zA-Z_][a-zA-Z0-9_]*'
+    String = r'\".*?\"'
+    Number = r'\d+'
+
+    """ Datatypes """
+    Empty = r'empty'
diff --git a/src/Models/CCLang/__init__.py b/src/Models/CCLang/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/Models/Interpreter/Error.py b/src/Models/Interpreter/Error.py
index c5cd81b..b72ee8b 100644
--- a/src/Models/Interpreter/Error.py
+++ b/src/Models/Interpreter/Error.py
@@ -4,6 +4,7 @@ from enum import Enum
 class ErrorCodes(Enum):
     StartFailed = 'Start failed'
     FileNotFound = 'File not found'
+    WrongFileType = 'Wrong file type'
 
     Unknown = 'Unknown {}'
     Inaccessible = '{} inaccessible'
diff --git a/src/ServiceInitializer.py b/src/ServiceInitializer.py
index 9789e21..5215d63 100644
--- a/src/ServiceInitializer.py
+++ b/src/ServiceInitializer.py
@@ -1,5 +1,6 @@
 from Interpreter.Validator import Validator
 from Interpreter.Interpreter import Interpreter
+from CCLang.Interpreter import Interpreter as CCLangInterpreter
 from Interpreter.Utils import Utils
 from Interpreter.Repo import Repo
 
@@ -10,3 +11,4 @@ class ServiceInitializer:
         self.repo = Repo()
         self.utils = Utils(self.repo)
         self.interpreter = Interpreter(self.repo, self.utils)
+        self.cclang_interpreter = CCLangInterpreter(self.repo, self.utils)
diff --git a/src/Main.py b/src/cclang.py
similarity index 56%
rename from src/Main.py
rename to src/cclang.py
index c0f2d44..9df5c6b 100644
--- a/src/Main.py
+++ b/src/cclang.py
@@ -12,6 +12,7 @@ class Main:
         self.__utils = self.__services.utils
         self.__repo = self.__services.repo
         self.__interpreter = self.__services.interpreter
+        self.__cclang_interpreter = self.__services.cclang_interpreter
 
     def console(self) -> None:
         """
@@ -19,9 +20,9 @@ class Main:
         :return:
         """
         i = 0
-        while self.__repo.is_error is not None:
+        while self.__repo.error is None:
             self.__repo.line_number = i + 1
-            self.__interpreter.interpret(self.__repo.line_number, input('> '))
+            self.__interpreter.interpret(input('> '))
             i += 1
 
     def files(self, file: str) -> None:
@@ -30,13 +31,19 @@ class Main:
         :param file:
         :return:
         """
-        if os.path.isfile(file):
-            f = open(file, 'r', encoding='utf-8').readlines()
-            for i in range(0, len(f)):
-                self.__repo.line_number = i + 1
-                self.__interpreter.interpret(f[i])
-        else:
-            self.__utils.is_error(Error(ErrorCodes.FileNotFound))
+        if not os.path.isfile(file):
+            self.__utils.runtime_error(Error(ErrorCodes.FileNotFound))
+            return
+
+        if not file.endswith('.cc'):
+            self.__utils.runtime_error(Error(ErrorCodes.WrongFileType))
+            return
+
+        f = open(file, 'r', encoding='utf-8').readlines()
+        for i in range(0, len(f)):
+            self.__repo.line_number = i + 1
+            # self.__interpreter.interpret(f[i])
+            self.__cclang_interpreter.interpret(f[i])
 
 
 if __name__ == '__main__':