diff --git a/cc_code_preview/Program/main.cc b/cc_code_preview/Program/main.cc
index f271c5e..d172d88 100644
--- a/cc_code_preview/Program/main.cc
+++ b/cc_code_preview/Program/main.cc
@@ -15,5 +15,12 @@ public lib Main {
             output(isTrue(test));
             output(this.test.getName());
         }
+
+        private func testForEach(): void {
+            var list = [];
+            list.forEach(e => {
+                output(e);
+            });
+        }
     }
 }
\ No newline at end of file
diff --git a/old/src/CCLang_sly/Interpreter.py b/old/src/CCLang_sly/Interpreter.py
deleted file mode 100644
index 18fde1a..0000000
--- a/old/src/CCLang_sly/Interpreter.py
+++ /dev/null
@@ -1,31 +0,0 @@
-from typing import Optional
-
-from CCLang_sly.Parser import Parser
-from Interpreter.Validator import Validator
-from CCLang_sly.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/old/src/CCLang_sly/Lexer.py b/old/src/CCLang_sly/Lexer.py
deleted file mode 100644
index 4f7bdfc..0000000
--- a/old/src/CCLang_sly/Lexer.py
+++ /dev/null
@@ -1,108 +0,0 @@
-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.LeftBrace.value
-    RBRACE = TokenDefinition.RightBrace.value
-    LPARAN = TokenDefinition.LeftParenthesis.value
-    RPARAN = TokenDefinition.RightParenthesis.value
-    LBRACKET = TokenDefinition.LeftBracket.value
-    RBRACKET = TokenDefinition.RightBracket.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/old/src/CCLang_sly/Parser.py b/old/src/CCLang_sly/Parser.py
deleted file mode 100644
index c2f20e8..0000000
--- a/old/src/CCLang_sly/Parser.py
+++ /dev/null
@@ -1,61 +0,0 @@
-from sly import Parser as SlyParser
-
-from CCLang_sly.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/old/src/cclang.py b/old/src/cclang.py
index f31825d..eecfb5b 100644
--- a/old/src/cclang.py
+++ b/old/src/cclang.py
@@ -12,7 +12,6 @@ class Main:
         self.__utils = self.__services.utils
         self.__repo = self.__services.repo
         self.__interpreter = self.__services.interpreter
-        # self.__sly_cclang_interpreter = self.__services.sly_cclang_interpreter
 
     def console(self) -> None:
         """
@@ -23,7 +22,6 @@ class Main:
         while self.__repo.error is None:
             self.__repo.line_number = i + 1
             self.__interpreter.interpret(input('> '))
-            # self.__sly_cclang_interpreter.interpret(input('> '))
             i += 1
 
     def files(self, file: str) -> None:
@@ -44,7 +42,6 @@ class Main:
         for i in range(0, len(f)):
             self.__repo.line_number = i + 1
             self.__interpreter.interpret(f[i])
-            # self.__sly_cclang_interpreter.interpret(f[i])
 
 
 if __name__ == '__main__':
diff --git a/src/cc_lang/model/datatypes.py b/src/cc_lang/model/datatypes.py
new file mode 100644
index 0000000..65177be
--- /dev/null
+++ b/src/cc_lang/model/datatypes.py
@@ -0,0 +1,12 @@
+from enum import Enum
+
+
+class Datatypes(Enum):
+
+    Empty = 'empty'
+    Any = 'any'
+    Number = 'number'
+    String = 'string'
+    Bool = 'bool'
+    List = 'list'
+    Dict = 'dict'
diff --git a/src/cc_lang/model/language_definition.py b/src/cc_lang/model/language_definition.py
new file mode 100644
index 0000000..7fe6ed6
--- /dev/null
+++ b/src/cc_lang/model/language_definition.py
@@ -0,0 +1,65 @@
+from cc_lang.model.datatypes import Datatypes
+from lexer.model.token_value_types import Keywords, FormatCharacters, ExpressionCharacters, Booleans
+
+
+class LanguageDefinition:
+    # interpreter
+    keywords = [
+        # define keywords
+        Keywords.Library.value,
+        Keywords.Class.value,
+        Keywords.Function.value,
+        Keywords.Variable.value,
+        Keywords.Use.value,
+        Keywords.From.value,
+        # builtin functions
+        Keywords.Output.value,
+        Keywords.Input.value,
+        Keywords.Length.value,
+        Keywords.Range.value,
+        Keywords.Exit.value,
+        # normal keywords
+        Keywords.If.value,
+        Keywords.ElseIf.value,
+        Keywords.Else.value,
+        Keywords.Continue.value,
+        Keywords.If.value,
+        Keywords.Return.value,
+        # loops
+        Keywords.While.value,
+        Keywords.For.value,
+        # access
+        Keywords.Public.value,
+        Keywords.This.value
+    ]
+    datatypes = [
+        Datatypes.Empty.value,
+        Datatypes.Any.value,
+        Datatypes.Number.value,
+        Datatypes.String.value,
+        Datatypes.Bool.value,
+        Datatypes.List.value,
+        Datatypes.Dict.value
+    ]
+    format_chars = [
+        FormatCharacters.Left_Brace.value,
+        FormatCharacters.Right_Brace.value,
+        FormatCharacters.Left_Parenthesis.value,
+        FormatCharacters.Right_Parenthesis.value,
+        FormatCharacters.Left_Bracket.value,
+        FormatCharacters.Right_Bracket.value,
+        FormatCharacters.Semicolon.value,
+        FormatCharacters.Colon.value,
+        FormatCharacters.Comma.value,
+        FormatCharacters.Point.value
+    ]
+    expr_chars = [
+        ExpressionCharacters.Plus.value,
+        ExpressionCharacters.Minus.value,
+        ExpressionCharacters.Asterisk.value,
+        ExpressionCharacters.Slash.value,
+        ExpressionCharacters.Equal.value,
+        ExpressionCharacters.Caret.value
+    ]
+    bool_expr_chars = ['<', '>', '!', '!=', '==', '>=', '<=', '&&', '||']
+    bool_values = [Booleans.Right.value, Booleans.Wrong.value]
diff --git a/src/cc_lang_interpreter/application.py b/src/cc_lang_interpreter/application.py
index bddf84d..7fc8be5 100644
--- a/src/cc_lang_interpreter/application.py
+++ b/src/cc_lang_interpreter/application.py
@@ -1,9 +1,12 @@
+import os
+
 from cpl.application import ApplicationABC
 from cpl.configuration import ConfigurationABC
 from cpl.console import Console
 from cpl.dependency_injection import ServiceProviderABC
 
 from lexer.abc.lexer_abc import LexerABC
+from runtime.abc.runtime_service_abc import RuntimeServiceABC
 
 
 class Application(ApplicationABC):
@@ -12,19 +15,57 @@ class Application(ApplicationABC):
         ApplicationABC.__init__(self, config, services)
 
         self._lexer: LexerABC = services.get_service(LexerABC)
+        self._runtime: RuntimeServiceABC = services.get_service(RuntimeServiceABC)
+
         self._path = config.get_configuration('p')
 
-    def _console(self): pass
+    def _interpret(self, line: str):
+        tokens = self._lexer.tokenize(line)
 
-    def _files(self): pass
+        line.replace("\n", "").replace("\t", "")
+        Console.write_line(f'\nLINE: {line}')
+        tokens.for_each(lambda t: Console.write_line(t.type, t.value))
+
+    def _console(self):
+        i = 0
+        while True:
+            self._runtime.line_count = i + 1
+            self._interpret(input('> '))
+            i += 1
+
+    def _files(self):
+        if not os.path.isdir(self._path):
+            raise FileNotFoundError(self._path)
+
+        # r=root, d=directories, f=files
+        for r, d, f in os.walk(self._path):
+            for file in f:
+                if file.endswith('.cc'):
+                    self._read_file(os.path.join(r, file))
+
+    def _read_file(self, file: str):
+        if not os.path.isfile(file):
+            raise FileNotFoundError
+            # self.__utils.runtime_error(Error(ErrorCodes.FileNotFound))
+
+        if not file.endswith('.cc'):
+            raise Exception('Wrong file type')
+            # self.__utils.runtime_error(Error(ErrorCodes.WrongFileType))
+
+        f = open(file, 'r', encoding='utf-8').readlines()
+        for i in range(0, len(f)):
+            self._runtime.line_count = i + 1
+            self._interpret(f[i])
 
     def configure(self):
         pass
 
     def main(self):
-        Console.write_line(self._configuration.additional_arguments, self._path)
         if self._path is None:
             self._console()
             return
 
-        self._files()
+        if os.path.isfile(self._path):
+            self._read_file(self._path)
+        else:
+            self._files()
diff --git a/src/cc_lang_interpreter/startup.py b/src/cc_lang_interpreter/startup.py
index f84d94a..4aa8673 100644
--- a/src/cc_lang_interpreter/startup.py
+++ b/src/cc_lang_interpreter/startup.py
@@ -4,6 +4,8 @@ from cpl.dependency_injection import ServiceProviderABC, ServiceCollectionABC
 
 from lexer.abc.lexer_abc import LexerABC
 from lexer.service.lexer_service import LexerService
+from runtime.abc.runtime_service_abc import RuntimeServiceABC
+from runtime.service.runtime_service import RuntimeService
 
 
 class Startup(StartupABC):
@@ -16,12 +18,13 @@ class Startup(StartupABC):
         self._services = services
 
     def configure_configuration(self) -> ConfigurationABC:
-        self._configuration.add_console_argument(ConsoleArgument('-', 'p', [], ' '))
+        self._configuration.add_console_argument(ConsoleArgument('-', 'p', [], ' ', is_value_token_optional=True))
         self._configuration.add_console_arguments()
 
         return self._configuration
 
     def configure_services(self) -> ServiceProviderABC:
         self._services.add_singleton(LexerABC, LexerService)
+        self._services.add_singleton(RuntimeServiceABC, RuntimeService)
 
         return self._services.build_service_provider()
diff --git a/src/lexer/abc/lexer_abc.py b/src/lexer/abc/lexer_abc.py
index 4c892e5..0c618a9 100644
--- a/src/lexer/abc/lexer_abc.py
+++ b/src/lexer/abc/lexer_abc.py
@@ -1,7 +1,14 @@
 from abc import ABC, abstractmethod
 
+from cpl_query.extension.list import List
+
+from lexer.model.token import Token
+
 
 class LexerABC(ABC):
 
     @abstractmethod
     def __init__(self): pass
+
+    @abstractmethod
+    def tokenize(self, line: str) -> List[Token]: pass
diff --git a/old/src/CCLang_sly/__init__.py b/src/lexer/model/__init__.py
similarity index 100%
rename from old/src/CCLang_sly/__init__.py
rename to src/lexer/model/__init__.py
diff --git a/src/lexer/model/token.py b/src/lexer/model/token.py
new file mode 100644
index 0000000..64493ab
--- /dev/null
+++ b/src/lexer/model/token.py
@@ -0,0 +1,20 @@
+from lexer.model.token_types import TokenTypes
+
+
+class Token:
+
+    def __init__(self, token_type: TokenTypes, value: str) -> None:
+        self._type: TokenTypes = token_type
+        self._value: str = value
+
+    @property
+    def type(self) -> TokenTypes:
+        return self._type
+
+    @property
+    def value(self) -> str:
+        return self._value
+
+    @value.setter
+    def value(self, value: str):
+        self._value = value
diff --git a/src/lexer/model/token_types.py b/src/lexer/model/token_types.py
new file mode 100644
index 0000000..94580b1
--- /dev/null
+++ b/src/lexer/model/token_types.py
@@ -0,0 +1,24 @@
+from enum import Enum
+
+
+class TokenTypes(Enum):
+    Empty = 0
+    Keyword = 1
+    Type = 2
+    Name = 3
+    Bool = 4
+    String = 5
+    Number = 6
+    Expression_Character = 7
+    Bool_Expression_Character = 8
+    Format_Character = 9
+
+
+class UnresolvedTokenTypes(Enum):
+    Empty = 0
+    Word = 1
+    Number = 2
+    String = 3
+    Expression_Character = 4
+    Bool_Expression_Character = 5
+    Format_Character = 6
diff --git a/src/lexer/model/token_value_types.py b/src/lexer/model/token_value_types.py
new file mode 100644
index 0000000..70dc45b
--- /dev/null
+++ b/src/lexer/model/token_value_types.py
@@ -0,0 +1,62 @@
+from enum import Enum
+
+
+class Keywords(Enum):
+    # define keywords
+    Library = 'lib'
+    Class = 'class'
+    Function = 'func'
+    Variable = 'var'
+    Use = 'use'
+    From = 'from'
+
+    # builtin functions
+    Output = 'output'
+    Input = 'input'
+    Length = 'length'
+    Range = 'range'
+    Exit = 'exit'
+
+    # normal keywords
+    If = 'if'
+    ElseIf = 'elseif'
+    Else = 'else'
+    Continue = 'continue'
+    In = 'in'
+    Return = 'return'
+
+    # loops
+    While = 'while'
+    For = 'for'
+
+    # access
+    Public = 'public'
+    This = 'this'
+
+
+class Booleans(Enum):
+    Right = 'true'
+    Wrong = 'false'
+
+
+class ExpressionCharacters(Enum):
+    Plus = '+'
+    Minus = '-'
+    Asterisk = '*'
+    Slash = '/'
+    Equal = '='
+    Caret = '^'
+
+
+class FormatCharacters(Enum):
+    Left_Brace = '{'
+    Right_Brace = '}'
+    Left_Parenthesis = '('
+    Right_Parenthesis = ')'
+    Left_Bracket = '['
+    Right_Bracket = ']'
+    Semicolon = ';'
+    Colon = ':'
+    Comma = ','
+    Point = '.'
+
diff --git a/src/lexer/service/lexer_service.py b/src/lexer/service/lexer_service.py
index 397174e..0e97faf 100644
--- a/src/lexer/service/lexer_service.py
+++ b/src/lexer/service/lexer_service.py
@@ -1,7 +1,166 @@
+from cpl_query.extension.list import List
+
+from cc_lang.model.language_definition import LanguageDefinition
 from lexer.abc.lexer_abc import LexerABC
+from lexer.model.token import Token
+from lexer.model.token_types import UnresolvedTokenTypes, TokenTypes
+from runtime.abc.runtime_service_abc import RuntimeServiceABC
 
 
 class LexerService(LexerABC):
 
-    def __init__(self):
-        pass
+    def __init__(self, runtime: RuntimeServiceABC):
+        self._runtime = runtime
+        
+        self._is_ml_comment = False
+
+    def _add_tok(self, tokens: List[Token], value: str, input_token_type: UnresolvedTokenTypes) -> None:
+        """
+        Creates token object
+        :param value:
+        :param input_token_type:
+        :return:
+        """
+        token_type: TokenTypes = TokenTypes.Empty
+
+        if value != '':
+            if input_token_type == UnresolvedTokenTypes.Word:
+                if value in LanguageDefinition.keywords:
+                    token_type = TokenTypes.Keyword
+
+                elif value in LanguageDefinition.datatypes:
+                    token_type = TokenTypes.Type
+
+                elif value in LanguageDefinition.bool_values:
+                    token_type = TokenTypes.Bool
+
+                elif value == UnresolvedTokenTypes.Empty:
+                    token_type = TokenTypes.Empty
+
+                else:
+                    token_type = TokenTypes.Name
+
+            elif input_token_type == UnresolvedTokenTypes.Number:
+                token_type = TokenTypes.Number
+
+            elif input_token_type == UnresolvedTokenTypes.String:
+                token_type = TokenTypes.String
+
+            elif input_token_type == UnresolvedTokenTypes.Expression_Character:
+                token_type = TokenTypes.Expression_Character
+
+            elif input_token_type == UnresolvedTokenTypes.Bool_Expression_Character:
+                token_type = TokenTypes.Bool_Expression_Character
+
+            elif input_token_type == UnresolvedTokenTypes.Format_Character:
+                token_type = TokenTypes.Format_Character
+
+            tokens.append(Token(token_type, value))
+
+    def tokenize(self, line: str) -> List[Token]:
+        tokens: List[Token] = List(Token)
+        word = ''
+        ol_comment = False
+        is_string1 = False  # 'hello'
+        is_string2 = False  # "hello"
+        is_number = False
+        is_expr_char = False
+
+        for i in range(0, len(line)):
+            c = line[i]
+            # ignore comments and spaces
+            if not ol_comment and not self._is_ml_comment:
+                # comment filtering
+                if c == '#' and not is_string1 and not is_string2:
+                    ol_comment = True
+
+                elif line[i - 1] == '/' and c == '/':
+                    ol_comment = True
+
+                elif line[i - 1] == '/' and c == '*':
+                    self._is_ml_comment = True
+                    i += 2
+
+                # end of number
+                elif not c.isdigit() and c != '.' and is_number:
+                    self._add_tok(tokens, word, UnresolvedTokenTypes.Number)
+                    local_tokens = self.tokenize(c)
+                    for local_token in local_tokens:
+                        tokens.append(local_token)
+
+                    word = ''
+                    is_number = False
+
+                # end of expression char
+                elif c not in LanguageDefinition.expr_chars and is_expr_char:
+                    self._add_tok(tokens, word, UnresolvedTokenTypes.Expression_Character)
+                    word = ''
+                    is_expr_char = False
+
+                # begin of is_string1
+                elif c == '\'' and not is_string1:
+                    is_string1 = True
+                    word = ''
+
+                # end of is_string1
+                elif c == '\'' and is_string1:
+                    is_string1 = False
+                    self._add_tok(tokens, word, UnresolvedTokenTypes.String)
+                    word = ''
+
+                # begin of is_string2
+                elif c == '\"' and not is_string2:
+                    is_string2 = True
+                    word = ''
+
+                # end of is_string2
+                elif c == '\"' and is_string2:
+                    is_string2 = False
+                    self._add_tok(tokens, word, UnresolvedTokenTypes.String)
+                    word = ''
+
+                # format char
+                elif c in LanguageDefinition.format_chars:
+                    self._add_tok(tokens, word, UnresolvedTokenTypes.Word)
+                    self._add_tok(tokens, c, UnresolvedTokenTypes.Format_Character)
+                    word = ''
+
+                # begin of number
+                elif c.isdigit() and not is_number and word == '':
+                    word += c
+                    is_number = True
+
+                # continue number
+                elif (c.isdigit() or c == '.') and is_number:
+                    word += c
+
+                # begin expression char
+                elif c in LanguageDefinition.expr_chars and not is_expr_char:
+                    word += c
+                    is_expr_char = True
+
+                # continue expression char
+                elif c in LanguageDefinition.expr_chars and is_expr_char:
+                    word += c
+
+                # bool expression char
+                elif c in LanguageDefinition.bool_expr_chars:
+                    self._add_tok(tokens, word, UnresolvedTokenTypes.Word)
+                    self._add_tok(tokens, c, UnresolvedTokenTypes.Bool_Expression_Character)
+                    word = ''
+
+                # end of word
+                elif c == ' ' and not is_string1 and not is_string2 or c == '\n':
+                    self._add_tok(tokens, word, UnresolvedTokenTypes.Word)
+                    word = ''
+
+                else:
+                    word += c
+
+            if c == '\n' and ol_comment:
+                ol_comment = False
+
+            if line[i - 1] == '*' and c == '/':
+                self._is_ml_comment = False
+
+        return tokens
diff --git a/src/runtime/abc/runtime_service_abc.py b/src/runtime/abc/runtime_service_abc.py
new file mode 100644
index 0000000..acd6550
--- /dev/null
+++ b/src/runtime/abc/runtime_service_abc.py
@@ -0,0 +1,15 @@
+from abc import ABC, abstractmethod
+
+
+class RuntimeServiceABC(ABC):
+
+    @abstractmethod
+    def __init__(self): pass
+
+    @property
+    @abstractmethod
+    def line_count(self) -> int: pass
+
+    @line_count.setter
+    @abstractmethod
+    def line_count(self, line_count: int): pass
diff --git a/src/runtime/service/__init__.py b/src/runtime/service/__init__.py
new file mode 100644
index 0000000..425ab6c
--- /dev/null
+++ b/src/runtime/service/__init__.py
@@ -0,0 +1 @@
+# imports
diff --git a/src/runtime/service/runtime_service.py b/src/runtime/service/runtime_service.py
new file mode 100644
index 0000000..54d34a0
--- /dev/null
+++ b/src/runtime/service/runtime_service.py
@@ -0,0 +1,15 @@
+from runtime.abc.runtime_service_abc import RuntimeServiceABC
+
+
+class RuntimeService(RuntimeServiceABC):
+
+    def __init__(self):
+        self._line_count = 0
+
+    @property
+    def line_count(self) -> int:
+        return self._line_count
+
+    @line_count.setter
+    def line_count(self, line_count: int):
+        self._line_count = line_count