C的Lex词法文件
发信站: 瀚海星云 (2005年11月15日18:02:26 星期二), 站内信件 WWWPOST
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D [0-9]
L [a-zA-Z_]
H [a-fA-F0-9]
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E [Ee][+-]?
{D}+
FS (f|F|l|L)
IS (u|U|l|L)*
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%
{
#include <stdio.h>
#include "y.tab.h"
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void count();
%}
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%%
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"/*"
{ comment(); }
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"auto"
{ count(); return(AUTO); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"break"
{ count(); return(BREAK); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"case"
{ count(); return(CASE); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"char"
{ count(); return(CHAR); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"const"
{ count(); return(CONST); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"continue"
{ count(); return(CONTINUE); }
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"default"
{ count(); return(DEFAULT); }
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"do"
{ count(); return(DO); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"double"
{ count(); return(DOUBLE); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"else"
{ count(); return(ELSE); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"enum"
{ count(); return(ENUM); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"extern"
{ count(); return(EXTERN); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"float"
{ count(); return(FLOAT); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"for"
{ count(); return(FOR); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"goto"
{ count(); return(GOTO); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"if"
{ count(); return(IF); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"int"
{ count(); return(INT); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"long"
{ count(); return(LONG); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"register"
{ count(); return(REGISTER); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"return"
{ count(); return(RETURN); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"short"
{ count(); return(SHORT); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"signed"
{ count(); return(SIGNED); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"sizeof"
{ count(); return(SIZEOF); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"static"
{ count(); return(STATIC); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"struct"
{ count(); return(STRUCT); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"switch"
{ count(); return(SWITCH); }
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"typedef"
{ count(); return(TYPEDEF); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"union"
{ count(); return(UNION); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"unsigned"
{ count(); return(UNSIGNED); }
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"void"
{ count(); return(VOID); }
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"volatile"
{ count(); return(VOLATILE); }
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"while"
{ count(); return(WHILE); }
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{L}(
{L}|
{D})*
{ count(); return(check_type()); }
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0[xX]
{H}+
{IS}?
{ count(); return(CONSTANT); }
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0
{D}+
{IS}?
{ count(); return(CONSTANT); }
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![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
{D}+
{IS}?
{ count(); return(CONSTANT); }
L?'(\\.|[^\\'])+' { count(); return(CONSTANT); }
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{D}+
{E}
{FS}?
{ count(); return(CONSTANT); }
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{D}*"."
{D}+(
{E})?
{FS}?
{ count(); return(CONSTANT); }
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{D}+"."
{D}*(
{E})?
{FS}?
{ count(); return(CONSTANT); }
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L?\"(\\.|[^\\"])*\" { count(); return(STRING_LITERAL); }
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"
"
{ count(); return(ELLIPSIS); }
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">>="
{ count(); return(RIGHT_ASSIGN); }
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"<<="
{ count(); return(LEFT_ASSIGN); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"+="
{ count(); return(ADD_ASSIGN); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"-="
{ count(); return(SUB_ASSIGN); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"*="
{ count(); return(MUL_ASSIGN); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"/="
{ count(); return(DIV_ASSIGN); }
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"%="
{ count(); return(MOD_ASSIGN); }
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"&="
{ count(); return(AND_ASSIGN); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"^="
{ count(); return(XOR_ASSIGN); }
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"|="
{ count(); return(OR_ASSIGN); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
">>"
{ count(); return(RIGHT_OP); }
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"<<"
{ count(); return(LEFT_OP); }
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"++"
{ count(); return(INC_OP); }
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"--"
{ count(); return(DEC_OP); }
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"->"
{ count(); return(PTR_OP); }
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"&&"
{ count(); return(AND_OP); }
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"||"
{ count(); return(OR_OP); }
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"<="
{ count(); return(LE_OP); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
">="
{ count(); return(GE_OP); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"=="
{ count(); return(EQ_OP); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"!="
{ count(); return(NE_OP); }
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";"
{ count(); return(';'); }
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("{"|"<%")
{ count(); return('{'); }
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("}"|"%>")
{ count(); return('}'); }
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","
{ count(); return(','); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
":"
{ count(); return(':'); }
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"="
{ count(); return('='); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"("
{ count(); return('('); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
")"
{ count(); return(')'); }
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("["|"<:")
{ count(); return('['); }
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("]"|":>")
{ count(); return(']'); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"."
{ count(); return('.'); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"&"
{ count(); return('&'); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"!"
{ count(); return('!'); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"~"
{ count(); return('~'); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"-"
{ count(); return('-'); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"+"
{ count(); return('+'); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"*"
{ count(); return('*'); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"/"
{ count(); return('/'); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"%"
{ count(); return('%'); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"<"
{ count(); return('<'); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
">"
{ count(); return('>'); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"^"
{ count(); return('^'); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"|"
{ count(); return('|'); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
"?"
{ count(); return('?'); }
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
[ \t\v\n\f]
{ count(); }
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
.
{ /**//* ignore bad characters */ }
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%%
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yywrap()
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{
return(1);
}
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comment()
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{
char c, c1;
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loop:
while ((c = input()) != '*' && c != 0)
putchar(c);
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if ((c1 = input()) != '/' && c != 0)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
unput(c1);
goto loop;
}
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
if (c != 0)
putchar(c1);
}
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![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
int column = 0;
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void count()
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![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
{
int i;
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
for (i = 0; yytext[i] != '\0'; i++)
if (yytext[i] == '\n')
column = 0;
else if (yytext[i] == '\t')
column += 8 - (column % 8);
else
column++;
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
ECHO;
}
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![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
int check_type()
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
{
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//*
* pseudo code --- this is what it should check
*
* if (yytext == type_name)
* return(TYPE_NAME);
*
* return(IDENTIFIER);
*/
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
/**//*
* it actually will only return IDENTIFIER
*/
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return(IDENTIFIER);
}
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
C的Yacc语法文件
发信站: 瀚海星云 (2005年11月15日18:02:44 星期二), 站内信件 WWWPOST
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
%token IDENTIFIER CONSTANT STRING_LITERAL SIZEOF
%token PTR_OP INC_OP DEC_OP LEFT_OP RIGHT_OP LE_OP GE_OP EQ_OP NE_OP
%token AND_OP OR_OP MUL_ASSIGN DIV_ASSIGN MOD_ASSIGN ADD_ASSIGN
%token SUB_ASSIGN LEFT_ASSIGN RIGHT_ASSIGN AND_ASSIGN
%token XOR_ASSIGN OR_ASSIGN TYPE_NAME
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
%token TYPEDEF EXTERN STATIC AUTO REGISTER
%token CHAR SHORT INT LONG SIGNED UNSIGNED FLOAT DOUBLE CONST VOLATILE VOID
%token STRUCT UNION ENUM ELLIPSIS
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
%token CASE DEFAULT IF ELSE SWITCH WHILE DO FOR GOTO CONTINUE BREAK RETURN
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
%start translation_unit
%%
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
primary_expression
: IDENTIFIER
| CONSTANT
| STRING_LITERAL
| '(' expression ')'
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
argument_expression_list
: assignment_expression
| argument_expression_list ',' assignment_expression
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
unary_expression
: postfix_expression
| INC_OP unary_expression
| DEC_OP unary_expression
| unary_operator cast_expression
| SIZEOF unary_expression
| SIZEOF '(' type_name ')'
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
unary_operator
: '&'
| '*'
| '+'
| '-'
| '~'
| '!'
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
cast_expression
: unary_expression
| '(' type_name ')' cast_expression
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
multiplicative_expression
: cast_expression
| multiplicative_expression '*' cast_expression
| multiplicative_expression '/' cast_expression
| multiplicative_expression '%' cast_expression
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
additive_expression
: multiplicative_expression
| additive_expression '+' multiplicative_expression
| additive_expression '-' multiplicative_expression
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
shift_expression
: additive_expression
| shift_expression LEFT_OP additive_expression
| shift_expression RIGHT_OP additive_expression
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
relational_expression
: shift_expression
| relational_expression '<' shift_expression
| relational_expression '>' shift_expression
| relational_expression LE_OP shift_expression
| relational_expression GE_OP shift_expression
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
equality_expression
: relational_expression
| equality_expression EQ_OP relational_expression
| equality_expression NE_OP relational_expression
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
and_expression
: equality_expression
| and_expression '&' equality_expression
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
exclusive_or_expression
: and_expression
| exclusive_or_expression '^' and_expression
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
inclusive_or_expression
: exclusive_or_expression
| inclusive_or_expression '|' exclusive_or_expression
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
logical_and_expression
: inclusive_or_expression
| logical_and_expression AND_OP inclusive_or_expression
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
logical_or_expression
: logical_and_expression
| logical_or_expression OR_OP logical_and_expression
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
conditional_expression
: logical_or_expression
| logical_or_expression '?' expression ':' conditional_expression
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
assignment_expression
: conditional_expression
| unary_expression assignment_operator assignment_expression
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
assignment_operator
: '='
| MUL_ASSIGN
| DIV_ASSIGN
| MOD_ASSIGN
| ADD_ASSIGN
| SUB_ASSIGN
| LEFT_ASSIGN
| RIGHT_ASSIGN
| AND_ASSIGN
| XOR_ASSIGN
| OR_ASSIGN
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
expression
: assignment_expression
| expression ',' assignment_expression
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
constant_expression
: conditional_expression
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
declaration
: declaration_specifiers ';'
| declaration_specifiers init_declarator_list ';'
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
declaration_specifiers
: storage_class_specifier
| storage_class_specifier declaration_specifiers
| type_specifier
| type_specifier declaration_specifiers
| type_qualifier
| type_qualifier declaration_specifiers
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
init_declarator_list
: init_declarator
| init_declarator_list ',' init_declarator
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
init_declarator
: declarator
| declarator '=' initializer
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
storage_class_specifier
: TYPEDEF
| EXTERN
| STATIC
| AUTO
| REGISTER
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
type_specifier
: VOID
| CHAR
| SHORT
| INT
| LONG
| FLOAT
| DOUBLE
| SIGNED
| UNSIGNED
| struct_or_union_specifier
| enum_specifier
| TYPE_NAME
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
struct_or_union_specifier
: struct_or_union IDENTIFIER '{' struct_declaration_list '}'
| struct_or_union '{' struct_declaration_list '}'
| struct_or_union IDENTIFIER
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
struct_or_union
: STRUCT
| UNION
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
struct_declaration_list
: struct_declaration
| struct_declaration_list struct_declaration
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
struct_declaration
: specifier_qualifier_list struct_declarator_list ';'
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
specifier_qualifier_list
: type_specifier specifier_qualifier_list
| type_specifier
| type_qualifier specifier_qualifier_list
| type_qualifier
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
struct_declarator_list
: struct_declarator
| struct_declarator_list ',' struct_declarator
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
struct_declarator
: declarator
| ':' constant_expression
| declarator ':' constant_expression
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
enum_specifier
: ENUM '{' enumerator_list '}'
| ENUM IDENTIFIER '{' enumerator_list '}'
| ENUM IDENTIFIER
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
enumerator_list
: enumerator
| enumerator_list ',' enumerator
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
enumerator
: IDENTIFIER
| IDENTIFIER '=' constant_expression
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
type_qualifier
: CONST
| VOLATILE
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
declarator
: pointer direct_declarator
| direct_declarator
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
direct_declarator
: IDENTIFIER
| '(' declarator ')'
| direct_declarator '[' constant_expression ']'
| direct_declarator '[' ']'
| direct_declarator '(' parameter_type_list ')'
| direct_declarator '(' identifier_list ')'
| direct_declarator '(' ')'
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
pointer
: '*'
| '*' type_qualifier_list
| '*' pointer
| '*' type_qualifier_list pointer
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
type_qualifier_list
: type_qualifier
| type_qualifier_list type_qualifier
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
parameter_type_list
: parameter_list
| parameter_list ',' ELLIPSIS
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
parameter_list
: parameter_declaration
| parameter_list ',' parameter_declaration
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
parameter_declaration
: declaration_specifiers declarator
| declaration_specifiers abstract_declarator
| declaration_specifiers
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
identifier_list
: IDENTIFIER
| identifier_list ',' IDENTIFIER
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
type_name
: specifier_qualifier_list
| specifier_qualifier_list abstract_declarator
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
abstract_declarator
: pointer
| direct_abstract_declarator
| pointer direct_abstract_declarator
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
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 ')'
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
initializer
: assignment_expression
| '{' initializer_list '}'
| '{' initializer_list ',' '}'
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
initializer_list
: initializer
| initializer_list ',' initializer
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
statement
: labeled_statement
| compound_statement
| expression_statement
| selection_statement
| iteration_statement
| jump_statement
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
labeled_statement
: IDENTIFIER ':' statement
| CASE constant_expression ':' statement
| DEFAULT ':' statement
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
compound_statement
: '{' '}'
| '{' statement_list '}'
| '{' declaration_list '}'
| '{' declaration_list statement_list '}'
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
declaration_list
: declaration
| declaration_list declaration
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
statement_list
: statement
| statement_list statement
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
expression_statement
: ';'
| expression ';'
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
selection_statement
: IF '(' expression ')' statement
| IF '(' expression ')' statement ELSE statement
| SWITCH '(' expression ')' statement
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
iteration_statement
: WHILE '(' expression ')' statement
| DO statement WHILE '(' expression ')' ';'
| FOR '(' expression_statement expression_statement ')' statement
| FOR '(' expression_statement expression_statement expression ')' statement
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
jump_statement
: GOTO IDENTIFIER ';'
| CONTINUE ';'
| BREAK ';'
| RETURN ';'
| RETURN expression ';'
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
translation_unit
: external_declaration
| translation_unit external_declaration
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
external_declaration
: function_definition
| declaration
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
function_definition
: declaration_specifiers declarator declaration_list compound_statement
| declaration_specifiers declarator compound_statement
| declarator declaration_list compound_statement
| declarator compound_statement
;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
%%
#include <stdio.h>
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
extern char yytext[];
extern int column;
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
yyerror(s)
char *s;
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
{
fflush(stdout);
printf("\n%*s\n%*s\n", column, "^", column, s);
}
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
--
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