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#!/usr/bin/perl
# The full monty
use Parse::RecDescent;
local $/;
my $grammar = <DATA>;
my $parser = Parse::RecDescent->new($grammar);
my $text = <>;
parser->translation_unit($text) or die "bad C code";
__DATA__
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 PTR_OP IDENTIFIER
| postfix_expression INC_OP
| postfix_expression DEC_OP
argument_expression_list:
assignment_expression
| argument_expression_list ',' assignment_expression
unary_expression:
postfix_expression
| INC_OP unary_expression
| DEC_OP 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 LEFT_OP additive_expression
| shift_expression RIGHT_OP additive_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
equality_expression:
relational_expression
| equality_expression EQ_OP relational_expression
| equality_expression NE_OP 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 AND_OP inclusive_or_expression
logical_or_expression:
logical_and_expression
| logical_or_expression OR_OP 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:
'='
| MUL_ASSIGN
| DIV_ASSIGN
| MOD_ASSIGN
| ADD_ASSIGN
| SUB_ASSIGN
| LEFT_ASSIGN
| RIGHT_ASSIGN
| AND_ASSIGN
| XOR_ASSIGN
| OR_ASSIGN
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 ',' ELLIPSIS
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
# TERMINALS
reserved_word:
AUTO | BREAK | CASE | CHAR | CONST |
CONTINUE | DEFAULT | DO | DOUBLE | ENUM |
EXTERN | FLOAT | FOR | GOTO | IF |
INT | LONG | REGISTER | RETURN | SHORT |
SIGNED | SIZEOF | STATIC | STRUCT | SWITCH |
TYPEDEF | UNION | UNSIGNED | VOID | VOLATILE |
WHILE
ADD_ASSIGN: '+='
AND_ASSIGN: '&='
AND_OP: '&&'
AUTO: 'auto'
BREAK: 'break'
CASE: 'case'
CHAR: 'char'
CONST: 'const'
CONSTANT: /[+-]?(?=\d|\.\d)\d*(\.\d*)?([Ee]([+-]?\d+))?/
CONTINUE: 'continue'
DEC_OP: '--'
DEFAULT: 'default'
DIV_ASSIGN: '/='
DO: 'do'
DOUBLE: 'double'
ELLIPSIS: '...'
ENUM: 'enum'
EQ_OP: '=='
EXTERN: 'extern'
FLOAT: 'float'
FOR: 'for'
GE_OP: '>='
GOTO: 'goto'
IDENTIFIER: ...!reserved_word /[a-z]\w*/i
IF: 'if'
INC_OP: '++'
INT: 'int'
LEFT_ASSIGN: '<<='
LEFT_OP: '<<'
LE_OP: '<='
LONG: 'long'
MOD_ASSIGN: '%='
MUL_ASSIGN: '*='
NE_OP: '!='
OR_ASSIGN: '|='
OR_OP: '||'
REGISTER: 'register'
RETURN: 'return'
RIGHT_ASSIGN: '>>='
RIGHT_OP: '>>'
SHORT: 'short'
SIGNED: 'signed'
SIZEOF: 'sizeof'
STATIC: 'static'
STRING_LITERAL: { extract_delimited($text,'"') }
STRUCT: 'struct'
SUB_ASSIGN: '-='
SWITCH: 'switch'
TYPEDEF: 'typedef'
TYPE_NAME: # NONE YET
UNION: 'union'
UNSIGNED: 'unsigned'
VOID: 'void'
VOLATILE: 'volatile'
WHILE: 'while'
XOR_ASSIGN: '^='
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