%token IDENTIFIER CONSTANT STRING_LITERAL SIZEOF
%token TYPE_NAME

%token TYPEDEF EXTERN STATIC AUTO REGISTER
%token CHAR SHORT INT LONG SIGNED UNSIGNED FLOAT DOUBLE CONST VOLATILE VOID
%token STRUCT UNION ENUM

%token CASE DEFAULT IF ELSE SWITCH WHILE DO FOR GOTO CONTINUE BREAK RETURN

%start translation_unit
%%

primary_expression
        : IDENTIFIER
        | CONSTANT
        | STRING_LITERAL
        | '(' expression ')'
        ;

postfix_expression
        : primary_expression
        | postfix_expression '[' expression ']'
        | postfix_expression '(' ')'
        | postfix_expression '(' argument_expression_list ')'
        | postfix_expression '.' IDENTIFIER
        | postfix_expression '->' IDENTIFIER
        | postfix_expression '++'
        | postfix_expression '--'
        ;

argument_expression_list
        : assignment_expression
        | argument_expression_list ',' assignment_expression
        ;

unary_expression
        : postfix_expression
        | '++' unary_expression
        | '--' unary_expression
        | unary_operator cast_expression
        | SIZEOF unary_expression
        | SIZEOF '(' type_name ')'
        ;

unary_operator
        : '&'
        | '*'
        | '+'
        | '-'
        | '~'
        | '!'
        ;

cast_expression
        : unary_expression
        | '(' type_name ')' cast_expression
        ;

multiplicative_expression
        : cast_expression
        | multiplicative_expression '*' cast_expression
        | multiplicative_expression '/' cast_expression
        | multiplicative_expression '%' cast_expression
        ;

additive_expression
        : multiplicative_expression
        | additive_expression '+' multiplicative_expression
        | additive_expression '-' multiplicative_expression
        ;

shift_expression
        : additive_expression
        | shift_expression '<<' additive_expression
        | shift_expression '>>' additive_expression
        ;

relational_expression
        : shift_expression
        | relational_expression '<' shift_expression
        | relational_expression '>' shift_expression
        | relational_expression '<=' shift_expression
        | relational_expression '>=' shift_expression
        ;

equality_expression
        : relational_expression
        | equality_expression '==' relational_expression
        | equality_expression '!=' relational_expression
        ;

and_expression
        : equality_expression
        | and_expression '&' equality_expression
        ;

exclusive_or_expression
        : and_expression
        | exclusive_or_expression '^' and_expression
        ;

inclusive_or_expression
        : exclusive_or_expression
        | inclusive_or_expression '|' exclusive_or_expression
        ;

logical_and_expression
        : inclusive_or_expression
        | logical_and_expression '&&' inclusive_or_expression
        ;

logical_or_expression
        : logical_and_expression
        | logical_or_expression '||' logical_and_expression
        ;

conditional_expression
        : logical_or_expression
        | logical_or_expression '?' expression ':' conditional_expression
        ;

assignment_expression
        : conditional_expression
        | unary_expression assignment_operator assignment_expression
        ;

assignment_operator
        : '='
        | '*='
        | '/='
        | '%='
        | '+='
        | '-='
        | '<<='
        | '>>='
        | '&='
        | '^='
        | '|='
        ;

expression
        : assignment_expression
        | expression ',' assignment_expression
        ;

constant_expression
        : conditional_expression
        ;

declaration
        : declaration_specifiers ';'
        | declaration_specifiers init_declarator_list ';'
        ;

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 ',' init_declarator
        ;

init_declarator
        : declarator
        | declarator '=' initializer
        ;

storage_class_specifier
        : TYPEDEF
        | EXTERN
        | STATIC
        | AUTO
        | REGISTER
        ;

type_specifier
        : VOID
        | CHAR
        | SHORT
        | INT
        | LONG
        | FLOAT
        | DOUBLE
        | SIGNED
        | UNSIGNED
        | struct_or_union_specifier
        | enum_specifier
        | TYPE_NAME
        ;

struct_or_union_specifier
        : struct_or_union IDENTIFIER '{' struct_declaration_list '}'
        | struct_or_union '{' struct_declaration_list '}'
        | struct_or_union IDENTIFIER
        ;

struct_or_union
        : STRUCT
        | UNION
        ;

struct_declaration_list
        : struct_declaration
        | struct_declaration_list struct_declaration
        ;

struct_declaration
        : specifier_qualifier_list struct_declarator_list ';'
        ;

specifier_qualifier_list
        : type_specifier specifier_qualifier_list
        | type_specifier
        | type_qualifier specifier_qualifier_list
        | type_qualifier
        ;

struct_declarator_list
        : struct_declarator
        | struct_declarator_list ',' struct_declarator
        ;

struct_declarator
        : declarator
        | ':' constant_expression
        | declarator ':' constant_expression
        ;

enum_specifier
        : ENUM '{' enumerator_list '}'
        | ENUM IDENTIFIER '{' enumerator_list '}'
        | ENUM IDENTIFIER
        ;

enumerator_list
        : enumerator
        | enumerator_list ',' enumerator
        ;

enumerator
        : IDENTIFIER
        | IDENTIFIER '=' constant_expression
        ;

type_qualifier
        : CONST
        | VOLATILE
        ;

declarator
        : pointer direct_declarator
        | direct_declarator
        ;

direct_declarator
        : IDENTIFIER
        | '(' declarator ')'
        | direct_declarator '[' constant_expression ']'
        | direct_declarator '[' ']'
        | direct_declarator '(' parameter_type_list ')'
        | direct_declarator '(' identifier_list ')'
        | direct_declarator '(' ')'
        ;

pointer
        : '*'
        | '*' type_qualifier_list
        | '*' pointer
        | '*' type_qualifier_list pointer
        ;

type_qualifier_list
        : type_qualifier
        | type_qualifier_list type_qualifier
        ;

parameter_type_list
        : parameter_list
        | parameter_list ',' '...'
        ;

parameter_list
        : parameter_declaration
        | parameter_list ',' parameter_declaration

parameter_declaration
        : declaration_specifiers declarator
        | declaration_specifiers abstract_declarator
        | declaration_specifiers
        ;

identifier_list
        : IDENTIFIER
        | identifier_list ',' IDENTIFIER
        ;

type_name
        : specifier_qualifier_list
        | specifier_qualifier_list abstract_declarator
        ;

abstract_declarator
        : pointer
        | direct_abstract_declarator
        | pointer direct_abstract_declarator
        ;

direct_abstract_declarator
        : '(' abstract_declarator ')'
        | '[' ']'
        | '[' constant_expression ']'
        | direct_abstract_declarator '[' ']'
        | direct_abstract_declarator '[' constant_expression ']'
        | '(' ')'
        | '(' parameter_type_list ')'
        | direct_abstract_declarator '(' ')'
        | direct_abstract_declarator '(' parameter_type_list ')'
        ;

initializer
        : assignment_expression
        | '{' initializer_list '}'
        | '{' initializer_list ',' '}'
        ;

initializer_list
        : initializer
        | initializer_list ',' initializer
        ;

statement
        : labeled_statement
        | compound_statement
        | expression_statement
        | selection_statement
        | iteration_statement
        | jump_statement
        ;

labeled_statement
        : IDENTIFIER ':' statement
        | CASE constant_expression ':' statement
        | DEFAULT ':' statement
        ;

compound_statement
        : '{' '}'
        | '{' statement_list '}'
        | '{' declaration_list '}'
        | '{' declaration_list statement_list '}'
        ;

declaration_list
        : declaration
        | declaration_list declaration
        ;

statement_list
        : statement
        | statement_list statement
        ;

expression_statement
        : ';'
        | expression ';'
        ;

selection_statement
        : IF '(' expression ')' statement
        | IF '(' expression ')' statement ELSE statement
        | SWITCH '(' expression ')' statement
        ;

iteration_statement
        : WHILE '(' expression ')' statement
        | DO statement WHILE '(' expression ')' ';'
        | FOR '(' expression_statement expression_statement ')' statement
        | FOR '(' expression_statement expression_statement expression ')' statement
        ;

jump_statement
        : GOTO IDENTIFIER ';'
        | CONTINUE ';'
        | BREAK ';'
        | RETURN ';'
        | RETURN expression ';'
        ;

translation_unit
        : external_declaration
        | translation_unit external_declaration
        ;

external_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
        ;

%%