diff --git a/src/parser/parser.yc b/src/parser/parser.yc
index 35f3381..8517c63 100644
--- a/src/parser/parser.yc
+++ b/src/parser/parser.yc
@@ -115,410 +115,410 @@ int yylex(YYSTYPE *, YYLTYPE *);
 %%
 
 constant
-        : INT_CONST
-        | FLOAT_CONST
-        | CHAR_CONST
-        ;
+    : INT_CONST
+    | FLOAT_CONST
+    | CHAR_CONST
+    ;
 
 primary_expression
-	: IDENTIFIER
-	| constant
-	| STRING_LITERAL
-	| LPAREN expression RPAREN
-	;
+    : IDENTIFIER
+    | constant
+    | STRING_LITERAL
+    | LPAREN expression RPAREN
+    ;
 
 postfix_expression
-	: primary_expression
-	| postfix_expression LBRACKET expression RBRACKET
-	| postfix_expression LPAREN RPAREN
-	| postfix_expression LPAREN argument_expression_list RPAREN
-	| postfix_expression DOT IDENTIFIER
-	| postfix_expression ARROW IDENTIFIER
-	| postfix_expression INCREMENT
-	| postfix_expression DECREMENT
-	;
+    : primary_expression
+    | postfix_expression LBRACKET expression RBRACKET
+    | postfix_expression LPAREN RPAREN
+    | postfix_expression LPAREN argument_expression_list RPAREN
+    | postfix_expression DOT IDENTIFIER
+    | postfix_expression ARROW IDENTIFIER
+    | postfix_expression INCREMENT
+    | postfix_expression DECREMENT
+    ;
 
 argument_expression_list
-	: assignment_expression
-	| argument_expression_list COMMA assignment_expression
-	;
+    : assignment_expression
+    | argument_expression_list COMMA assignment_expression
+    ;
 
 unary_expression
-	: postfix_expression
-	| INCREMENT unary_expression
-	| DECREMENT unary_expression
-	| unary_operator cast_expression
-	| SIZEOF unary_expression
-	| SIZEOF LPAREN type_name RPAREN
-	;
+    : postfix_expression
+    | INCREMENT unary_expression
+    | DECREMENT unary_expression
+    | unary_operator cast_expression
+    | SIZEOF unary_expression
+    | SIZEOF LPAREN type_name RPAREN
+    ;
 
 unary_operator
-	: BITAND
-	| TIMES
-	| PLUS
-	| MINUS
-	| BITNOT
-	| NOT
-	;
+    : BITAND
+    | TIMES
+    | PLUS
+    | MINUS
+    | BITNOT
+    | NOT
+    ;
 
 cast_expression
-	: unary_expression
-	| LPAREN type_name RPAREN cast_expression
-	;
+    : unary_expression
+    | LPAREN type_name RPAREN cast_expression
+    ;
 
 multiplicative_expression
-	: cast_expression
-	| multiplicative_expression TIMES cast_expression
-	| multiplicative_expression DIVIDE cast_expression
-	| multiplicative_expression MOD cast_expression
-	;
+    : cast_expression
+    | multiplicative_expression TIMES cast_expression
+    | multiplicative_expression DIVIDE cast_expression
+    | multiplicative_expression MOD cast_expression
+    ;
 
 additive_expression
-	: multiplicative_expression
-	| additive_expression PLUS multiplicative_expression
-	| additive_expression MINUS multiplicative_expression
-	;
+    : multiplicative_expression
+    | additive_expression PLUS multiplicative_expression
+    | additive_expression MINUS multiplicative_expression
+    ;
 
 shift_expression
-	: additive_expression
-	| shift_expression LSHIFT additive_expression
-	| shift_expression RSHIFT additive_expression
-	;
+    : additive_expression
+    | shift_expression LSHIFT additive_expression
+    | shift_expression RSHIFT additive_expression
+    ;
 
 relational_expression
-	: shift_expression
-	| relational_expression LESS shift_expression
-	| relational_expression GREATER shift_expression
-	| relational_expression LESSEQ shift_expression
-	| relational_expression GREATEREQ shift_expression
-	;
+    : shift_expression
+    | relational_expression LESS shift_expression
+    | relational_expression GREATER shift_expression
+    | relational_expression LESSEQ shift_expression
+    | relational_expression GREATEREQ shift_expression
+    ;
 
 equality_expression
-	: relational_expression
-	| equality_expression EQUALS relational_expression
-	| equality_expression NOTEQUALS relational_expression
-	;
+    : relational_expression
+    | equality_expression EQUALS relational_expression
+    | equality_expression NOTEQUALS relational_expression
+    ;
 
 and_expression
-	: equality_expression
-	| and_expression BITAND equality_expression
-	;
+    : equality_expression
+    | and_expression BITAND equality_expression
+    ;
 
 exclusive_or_expression
-	: and_expression
-	| exclusive_or_expression XOR and_expression
-	;
+    : and_expression
+    | exclusive_or_expression XOR and_expression
+    ;
 
 inclusive_or_expression
-	: exclusive_or_expression
-	| inclusive_or_expression BITOR exclusive_or_expression
-	;
+    : exclusive_or_expression
+    | inclusive_or_expression BITOR exclusive_or_expression
+    ;
 
 logical_and_expression
-	: inclusive_or_expression
-	| logical_and_expression AND inclusive_or_expression
-	;
+    : inclusive_or_expression
+    | logical_and_expression AND inclusive_or_expression
+    ;
 
 logical_or_expression
-	: logical_and_expression
-	| logical_or_expression OR logical_and_expression
-	;
+    : logical_and_expression
+    | logical_or_expression OR logical_and_expression
+    ;
 
 conditional_expression
-	: logical_or_expression
-	| logical_or_expression QUESTION expression COLON conditional_expression
-	;
+    : logical_or_expression
+    | logical_or_expression QUESTION expression COLON conditional_expression
+    ;
 
 assignment_expression
-	: conditional_expression
-	| unary_expression assignment_operator assignment_expression
-	;
+    : conditional_expression
+    | unary_expression assignment_operator assignment_expression
+    ;
 
 assignment_operator
-	: ASSIGN
-	| MUL_ASSIGN
-	| DIV_ASSIGN
-	| MOD_ASSIGN
-	| ADD_ASSIGN
-	| SUB_ASSIGN
-	| LEFT_ASSIGN
-	| RIGHT_ASSIGN
-	| AND_ASSIGN
-	| XOR_ASSIGN
-	| OR_ASSIGN
-	;
+    : ASSIGN
+    | MUL_ASSIGN
+    | DIV_ASSIGN
+    | MOD_ASSIGN
+    | ADD_ASSIGN
+    | SUB_ASSIGN
+    | LEFT_ASSIGN
+    | RIGHT_ASSIGN
+    | AND_ASSIGN
+    | XOR_ASSIGN
+    | OR_ASSIGN
+    ;
 
 expression
-	: assignment_expression
-	| expression COMMA assignment_expression
-	;
+    : assignment_expression
+    | expression COMMA assignment_expression
+    ;
 
 constant_expression
-	: conditional_expression
-	;
+    : conditional_expression
+    ;
 
 declaration
-	: declaration_specifiers SEMICOLON
-	| declaration_specifiers init_declarator_list SEMICOLON
-	;
+    : declaration_specifiers SEMICOLON
+    | declaration_specifiers init_declarator_list SEMICOLON
+    ;
 
 declaration_specifiers
-	: storage_class_specifier
-	| storage_class_specifier declaration_specifiers
-	| type_specifier
-	| type_specifier declaration_specifiers
-	| type_qualifier
-	| type_qualifier declaration_specifiers
-	;
+    : storage_class_specifier
+    | storage_class_specifier declaration_specifiers
+    | type_specifier
+    | type_specifier declaration_specifiers
+    | type_qualifier
+    | type_qualifier declaration_specifiers
+    ;
 
 init_declarator_list
-	: init_declarator
-	| init_declarator_list COMMA init_declarator
-	;
+    : init_declarator
+    | init_declarator_list COMMA init_declarator
+    ;
 
 init_declarator
-	: declarator
-	| declarator ASSIGN initializer
-	;
+    : declarator
+    | declarator ASSIGN initializer
+    ;
 
 storage_class_specifier
-	: TYPEDEF
-	| EXTERN
-	| STATIC
-	| AUTO
-	| REGISTER
-	;
+    : TYPEDEF
+    | EXTERN
+    | STATIC
+    | AUTO
+    | REGISTER
+    ;
 
 type_specifier
-	: VOID
-	| CHAR
-	| SHORT
-	| INT
-	| LONG
-	| FLOAT
-	| DOUBLE
-	| SIGNED
-	| UNSIGNED
-	| struct_or_union_specifier
-	| enum_specifier
-	| IDENTIFIER
-	;
+    : VOID
+    | CHAR
+    | SHORT
+    | INT
+    | LONG
+    | FLOAT
+    | DOUBLE
+    | SIGNED
+    | UNSIGNED
+    | struct_or_union_specifier
+    | enum_specifier
+    | IDENTIFIER
+    ;
 
 struct_or_union_specifier
-	: struct_or_union IDENTIFIER LCURLY struct_declaration_list RCURLY
-	| struct_or_union LCURLY struct_declaration_list RCURLY
-	| struct_or_union IDENTIFIER
-	;
+    : struct_or_union IDENTIFIER LCURLY struct_declaration_list RCURLY
+    | struct_or_union LCURLY struct_declaration_list RCURLY
+    | struct_or_union IDENTIFIER
+    ;
 
 struct_or_union
-	: STRUCT
-	| UNION
-	;
+    : STRUCT
+    | UNION
+    ;
 
 struct_declaration_list
-	: struct_declaration
-	| struct_declaration_list struct_declaration
-	;
+    : struct_declaration
+    | struct_declaration_list struct_declaration
+    ;
 
 struct_declaration
-	: specifier_qualifier_list struct_declarator_list SEMICOLON
-	;
+    : specifier_qualifier_list struct_declarator_list SEMICOLON
+    ;
 
 specifier_qualifier_list
-	: type_specifier specifier_qualifier_list
-	| type_specifier
-	| type_qualifier specifier_qualifier_list
-	| type_qualifier
-	;
+    : type_specifier specifier_qualifier_list
+    | type_specifier
+    | type_qualifier specifier_qualifier_list
+    | type_qualifier
+    ;
 
 struct_declarator_list
-	: struct_declarator
-	| struct_declarator_list COMMA struct_declarator
-	;
+    : struct_declarator
+    | struct_declarator_list COMMA struct_declarator
+    ;
 
 struct_declarator
-	: declarator
-	| COLON constant_expression
-	| declarator COLON constant_expression
-	;
+    : declarator
+    | COLON constant_expression
+    | declarator COLON constant_expression
+    ;
 
 enum_specifier
-	: ENUM LCURLY enumerator_list RCURLY
-	| ENUM IDENTIFIER LCURLY enumerator_list RCURLY
-	| ENUM IDENTIFIER
-	;
+    : ENUM LCURLY enumerator_list RCURLY
+    | ENUM IDENTIFIER LCURLY enumerator_list RCURLY
+    | ENUM IDENTIFIER
+    ;
 
 enumerator_list
-	: enumerator
-	| enumerator_list COMMA enumerator
-	;
+    : enumerator
+    | enumerator_list COMMA enumerator
+    ;
 
 enumerator
-	: IDENTIFIER
-	| IDENTIFIER ASSIGN constant_expression
-	;
+    : IDENTIFIER
+    | IDENTIFIER ASSIGN constant_expression
+    ;
 
 type_qualifier
-	: CONST
-	| VOLATILE
-	;
+    : CONST
+    | VOLATILE
+    ;
 
 declarator
-	: pointer direct_declarator
-	| direct_declarator
-	;
+    : pointer direct_declarator
+    | direct_declarator
+    ;
 
 direct_declarator
-	: IDENTIFIER
-	| LPAREN declarator RPAREN
-	| direct_declarator LBRACKET constant_expression RBRACKET
-	| direct_declarator LBRACKET RBRACKET
-	| direct_declarator LPAREN parameter_type_list RPAREN
-	| direct_declarator LPAREN identifier_list RPAREN
-	| direct_declarator LPAREN RPAREN
-	;
+    : IDENTIFIER
+    | LPAREN declarator RPAREN
+    | direct_declarator LBRACKET constant_expression RBRACKET
+    | direct_declarator LBRACKET RBRACKET
+    | direct_declarator LPAREN parameter_type_list RPAREN
+    | direct_declarator LPAREN identifier_list RPAREN
+    | direct_declarator LPAREN RPAREN
+    ;
 
 pointer
-	: TIMES
-	| TIMES type_qualifier_list
-	| TIMES pointer
-	| TIMES type_qualifier_list pointer
-	;
+    : TIMES
+    | TIMES type_qualifier_list
+    | TIMES pointer
+    | TIMES type_qualifier_list pointer
+    ;
 
 type_qualifier_list
-	: type_qualifier
-	| type_qualifier_list type_qualifier
-	;
+    : type_qualifier
+    | type_qualifier_list type_qualifier
+    ;
 
 
 parameter_type_list
-	: parameter_list
-	| parameter_list COMMA ELLIPSIS
-	;
+    : parameter_list
+    | parameter_list COMMA ELLIPSIS
+    ;
 
 parameter_list
-	: parameter_declaration
-	| parameter_list COMMA parameter_declaration
-	;
+    : parameter_declaration
+    | parameter_list COMMA parameter_declaration
+    ;
 
 parameter_declaration
-	: declaration_specifiers declarator
-	| declaration_specifiers abstract_declarator
-	| declaration_specifiers
-	;
+    : declaration_specifiers declarator
+    | declaration_specifiers abstract_declarator
+    | declaration_specifiers
+    ;
 
 identifier_list
-	: IDENTIFIER
-	| identifier_list COMMA IDENTIFIER
-	;
+    : IDENTIFIER
+    | identifier_list COMMA IDENTIFIER
+    ;
 
 type_name
-	: specifier_qualifier_list
-	| specifier_qualifier_list abstract_declarator
-	;
+    : specifier_qualifier_list
+    | specifier_qualifier_list abstract_declarator
+    ;
 
 abstract_declarator
-	: pointer
-	| direct_abstract_declarator
-	| pointer direct_abstract_declarator
-	;
+    : pointer
+    | direct_abstract_declarator
+    | pointer direct_abstract_declarator
+    ;
 
 direct_abstract_declarator
-	: LPAREN abstract_declarator RPAREN
-	| LBRACKET RBRACKET
-	| LBRACKET constant_expression RBRACKET
-	| direct_abstract_declarator LBRACKET RBRACKET
-	| direct_abstract_declarator LBRACKET constant_expression RBRACKET
-	| LPAREN RPAREN
-	| LPAREN parameter_type_list RPAREN
-	| direct_abstract_declarator LPAREN RPAREN
-	| direct_abstract_declarator LPAREN parameter_type_list RPAREN
-	;
+    : LPAREN abstract_declarator RPAREN
+    | LBRACKET RBRACKET
+    | LBRACKET constant_expression RBRACKET
+    | direct_abstract_declarator LBRACKET RBRACKET
+    | direct_abstract_declarator LBRACKET constant_expression RBRACKET
+    | LPAREN RPAREN
+    | LPAREN parameter_type_list RPAREN
+    | direct_abstract_declarator LPAREN RPAREN
+    | direct_abstract_declarator LPAREN parameter_type_list RPAREN
+    ;
 
 initializer
-	: assignment_expression
-	| LCURLY initializer_list RCURLY
-	| LCURLY initializer_list COMMA RCURLY
-	;
+    : assignment_expression
+    | LCURLY initializer_list RCURLY
+    | LCURLY initializer_list COMMA RCURLY
+    ;
 
 initializer_list
-	: initializer
-	| initializer_list COMMA initializer
-	;
+    : initializer
+    | initializer_list COMMA initializer
+    ;
 
 statement
-	: labeled_statement
-	| compound_statement
-	| expression_statement
-	| selection_statement
-	| iteration_statement
-	| jump_statement
-	;
+    : labeled_statement
+    | compound_statement
+    | expression_statement
+    | selection_statement
+    | iteration_statement
+    | jump_statement
+    ;
 
 labeled_statement
-	: IDENTIFIER COLON statement
-	| CASE constant_expression COLON statement
-	| DEFAULT COLON statement
-	;
+    : IDENTIFIER COLON statement
+    | CASE constant_expression COLON statement
+    | DEFAULT COLON statement
+    ;
 
 compound_statement
-	: LCURLY RCURLY
-	| LCURLY statement_list RCURLY
-	| LCURLY declaration_list RCURLY
-	| LCURLY declaration_list statement_list RCURLY
-	;
+    : LCURLY RCURLY
+    | LCURLY statement_list RCURLY
+    | LCURLY declaration_list RCURLY
+    | LCURLY declaration_list statement_list RCURLY
+    ;
 
 declaration_list
-	: declaration
-	| declaration_list declaration
-	;
+    : declaration
+    | declaration_list declaration
+    ;
 
 statement_list
-	: statement
-	| statement_list statement
-	;
+    : statement
+    | statement_list statement
+    ;
 
 expression_statement
-	: SEMICOLON
-	| expression SEMICOLON
-	;
+    : SEMICOLON
+    | expression SEMICOLON
+    ;
 
 selection_statement
-	: IF LPAREN expression RPAREN statement
-	| IF LPAREN expression RPAREN statement ELSE statement
-	| SWITCH LPAREN expression RPAREN statement
-	;
+    : IF LPAREN expression RPAREN statement
+    | IF LPAREN expression RPAREN statement ELSE statement
+    | SWITCH LPAREN expression RPAREN statement
+    ;
 
 iteration_statement
-	: WHILE LPAREN expression RPAREN statement
-	| DO statement WHILE LPAREN expression RPAREN SEMICOLON
-	| FOR LPAREN expression_statement expression_statement RPAREN statement
-	| FOR LPAREN expression_statement expression_statement expression RPAREN statement
-	;
+    : WHILE LPAREN expression RPAREN statement
+    | DO statement WHILE LPAREN expression RPAREN SEMICOLON
+    | FOR LPAREN expression_statement expression_statement RPAREN statement
+    | FOR LPAREN expression_statement expression_statement expression RPAREN statement
+    ;
 
 jump_statement
-	: GOTO IDENTIFIER SEMICOLON
-	| CONTINUE SEMICOLON
-	| BREAK SEMICOLON
-	| RETURN SEMICOLON
-	| RETURN expression SEMICOLON
-	;
+    : GOTO IDENTIFIER SEMICOLON
+    | CONTINUE SEMICOLON
+    | BREAK SEMICOLON
+    | RETURN SEMICOLON
+    | RETURN expression SEMICOLON
+    ;
 
 translation_unit
-	: external_declaration
-	| translation_unit external_declaration
-	;
+    : external_declaration
+    | translation_unit external_declaration
+    ;
 
 external_declaration
-	: function_definition
-	| declaration
-	;
+    : function_definition
+    | declaration
+    ;
 
 function_definition
-	: declaration_specifiers declarator declaration_list compound_statement
-	| declaration_specifiers declarator compound_statement
-	| declarator declaration_list compound_statement
-	| declarator compound_statement
-	;
+    : declaration_specifiers declarator declaration_list compound_statement
+    | declaration_specifiers declarator compound_statement
+    | declarator declaration_list compound_statement
+    | declarator compound_statement
+    ;
 
 %%