c语言的文法产生式代码实例

c语言的文法产生式代码实例

programà
      external_declaration
     | program external_declaration
 
external_declarationà
     function_definition
     | declaration
    
function_definitionà type_specifier declarator compound_statement
 
type_specifierà
     VOID
     | CHAR
     | INT
     | FLOAT
 
declarator
     pointer direct_declarator
     | direct_declarator
 
Pointerà
     '*'
     | '*' pointer
 
direct_declarator
     IDENTIFIER
  |direct_declarator’[‘ ‘]’
     |direct_declarator ’[’ constant_expression ’]’
     | IDENTIFIER '(' parameter_list ')'
| IDENTIFIER '(' ')'
     |direct_declarator  ‘,’  identifier_list
 
identifier_list
     : IDENTIFIER
     | identifier_list ',' IDENTIFIER
 
constant_expressionà
     conditional_expression
 
parameter_listà
      parameter_declaration
     | parameter_list ',' parameter_declaration

parameter_declaration à
     declaration_specifiers  IDENTIFIER
 
compound_statementà
      '{' '}'
     | '{' statement_list '}'
     | '{' declaration_list statement_list '}'
 
declaration_listà
      declaration
     | declaration_list declaration
 
Declarationà
      init_declarator
     | init_declarator_list ',' init_declarator
 
init_declaratorà
      declarator
     | declarator '=' initializer
 
Initializerà
      assignment_expression
     | '{' initializer_list '}'
     | '{' initializer_list ',' '}'
 
initializer_listà
      initializer
     | initializer_list ',' initializer
 
statement_listà
     statement
     | statement_list statement
 
Statementà
     | compound_statement
     | expression_statement
     | selection_statement
     | iteration_statement
     | jump_statement
 
expression_statementà
     ';'
     | expression ';'
 
selection_statement
     : IF '(' expression ')' statement
     | IF '(' expression ')' statement ELSE statement
 
iteration_statementà
      WHILE '(' expression ')' statement
     | FOR '(' expression_statement expression_statement ')' statement
     | FOR '(' expression_statement expression_statement expression ')' statement
 
jump_statement
     | CONTINUE ';'
     | BREAK ';'
     | RETURN ';'
     | RETURN expression ';'
 
expression
     : assignment_expression
     | expression ',' assignment_expression
 
assignment_expressionà
     conditional_expression
     | unary_expression assignment_operator assignment_expression
 
conditional_expressionà
      logical_or_expression
     | logical_or_expression '?' expression ':' conditional_expression
 
logical_or_expressionà
     logical_and_expression
     | logical_or_expression OR_OP logical_and_expression
 
logical_and_expression
     : inclusive_or_expression
     | logical_and_expression AND_OP inclusive_or_expression
 
inclusive_or_expressionà
     exclusive_or_expression
     | inclusive_or_expression '|' exclusive_or_expression
 
exclusive_or_expression
     : and_expression
     | exclusive_or_expression '^' and_expression
 
and_expression
     : equality_expression
     | and_expression '&' equality_expression
 
equality_expression
     : relational_expression
     | equality_expression EQ_OP relational_expression
     | equality_expression NE_OP relational_expression
 
relational_expression
     : shift_expression
     | relational_expression '<' shift_expression
     | relational_expression '>' shift_expression
     | relational_expression LE_OP shift_expression
     | relational_expression GE_OP shift_expression
 
shift_expression
     : additive_expression
     | shift_expression LEFT_OP additive_expression
     | shift_expression RIGHT_OP additive_expression
 
additive_expression
     : multiplicative_expression
     | additive_expression '+' multiplicative_expression
     | additive_expression '-' multiplicative_expression
 
multiplicative_expression
     : cast_expression
     | multiplicative_expression '*' cast_expression
     | multiplicative_expression '/' cast_expression
     | multiplicative_expression '%' cast_expression
 
cast_expression
     : unary_expression
     | '(' type_name ')' cast_expression
 
unary_expression
     : postfix_expression
     | INC_OP unary_expression
     | DEC_OP unary_expression
     | unary_operator cast_expression
     | SIZEOF unary_expression
     | SIZEOF '(' type_name ')'
 
postfix_expressionà
     : primary_expression
     | postfix_expression '[' expression ']'
     | postfix_expression '(' ')'
     | postfix_expression '(' argument_expression_list ')'
     | postfix_expression '.' IDENTIFIER
     | postfix_expression PTR_OP IDENTIFIER
     | postfix_expression INC_OP
     | postfix_expression DEC_OP
 
primary_expressionà
     IDENTIFIER
     | CONSTANT
     | STRING_LITERAL
     | '(' expression ')'
 
argument_expression_list
     : assignment_expression
     | argument_expression_list ',' assignment_expression
 
unary_operator
     : '&'
     | '*'
     | '+'
     | '-'
     | '~'
     | '!'
 
assignment_operatorà
      '='
     | MUL_ASSIGN
     | DIV_ASSIGN
     | MOD_ASSIGN
     | ADD_ASSIGN
     | SUB_ASSIGN
     | LEFT_ASSIGN
     | RIGHT_ASSIGN
     | AND_ASSIGN
     | XOR_ASSIGN
     | OR_ASSIGN
 
storage_class_specifierà
      TYPEDEF
     | EXTERN
     | STATIC
     | AUTO
     | REGISTER
 
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_listà
      type_specifier specifier_qualifier_list
     | type_specifier
     | type_qualifier specifier_qualifier_list
     | type_qualifier
    
struct_declarator_listà
      struct_declarator
     | struct_declarator_list ',' struct_declarator
    
struct_declaratorà
     : declarator
     | ':' constant_expression
     | declarator ':' constant_expression
    
enum_specifierà
      ENUM '{' enumerator_list '}'
     | ENUM IDENTIFIER '{' enumerator_list '}'
     | ENUM IDENTIFIER
    
enumerator_listà
      enumerator
     | enumerator_list ',' enumerator
    
Enumeratorà
      IDENTIFIER
     | IDENTIFIER '=' constant_expression
    
type_qualifierà
      CONST
     | VOLATILE
    
type_qualifier_listà
      type_qualifier
     | type_qualifier_list type_qualifier
    
parameter_type_listà
      parameter_list
     | parameter_list ',' ELLIPSIS
    
parameter_listà
     : parameter_declaration
     | parameter_list ',' parameter_declaration
    
type_nameà
      specifier_qualifier_list
     | specifier_qualifier_list abstract_declarator
    
abstract_declaratorà
      pointer
     | direct_abstract_declarator
     | pointer direct_abstract_declarator
    
direct_abstract_declaratorà
      '(' abstract_declarator ')'
     | '[' ']'
     | '[' constant_expression ']'
     | direct_abstract_declarator '[' ']'
     | direct_abstract_declarator '[' constant_expression ']'
     | '(' ')'
     | '(' parameter_type_list ')'
     | direct_abstract_declarator '(' ')'
     | direct_abstract_declarator '(' parameter_type_list ')'
    
labeled_statementà
      IDENTIFIER ':' statement
     | CASE constant_expression ':' statement
     | DEFAULT ':' statement