标准C语言词法、语法分析YACC完整代码

D                  [0-9]
L                       [a-zA-Z_]
H                       [a-fA-F0-9]
E                       [Ee][+-]?{D}+
FS                      (f|F|l|L)
IS                      (u|U|l|L)*

%{
#include <stdio.h>
#include "myparser.h"
void count();
%}
 
%%
"/*"                    { comment(); }
"//"[^\n]*\n        {}
"auto"                  { count(); return(AUTO); }
"break"                 { count(); return(BREAK); }
"case"                  { count(); return(CASE); }
"char"                  { count(); return(CHAR); }
"const"                 { count(); return(CONST); }
"continue"              { count(); return(CONTINUE); }
"default"               { count(); return(DEFAULT); }
"do"                    { count(); return(DO); }
"double"                { count(); return(DOUBLE); }
"else"                  { count(); return(ELSE); }
"enum"                  { count(); return(ENUM); }
"extern"                { count(); return(EXTERN); }
"float"                 { count(); return(FLOAT); }
"for"                   { count(); return(FOR); }
"goto"                  { count(); return(GOTO); }
"if"                    { count(); return(IF); }
"int"                   { count(); return(INT); }
"long"                  { count(); return(LONG); }
"register"              { count(); return(REGISTER); }
"return"                { count(); return(RETURN); }
"short"                 { count(); return(SHORT); }
"signed"                { count(); return(SIGNED); }
"sizeof"                { count(); return(SIZEOF); }
"static"                { count(); return(STATIC); }
"struct"                { count(); return(STRUCT); }
"switch"                { count(); return(SWITCH); }
"typedef"               { count(); return(TYPEDEF); }
"union"                 { count(); return(UNION); }
"unsigned"              { count(); return(UNSIGNED); }
"void"                  { count(); return(VOID); }
"volatile"              { count(); return(VOLATILE); }
"while"                 { count(); return(WHILE); }

{L}({L}|{D})*           { count(); return(check_type()); }

0[xX]{H}+{IS}?          { count(); return(CONSTANT); }
0{D}+{IS}?              { count(); return(CONSTANT); }
{D}+{IS}?               { count(); return(CONSTANT); }
L?'(\\.|[^\\'])+'       { count(); return(CONSTANT); }

{D}+{E}{FS}?            { count(); return(CONSTANT); }
{D}*"."{D}+({E})?{FS}?  { count(); return(CONSTANT); }
{D}+"."{D}*({E})?{FS}?  { count(); return(CONSTANT); }

L?\"(\\.|[^\\"])*\"     { count(); return(STRING_LITERAL); }

"..."                   { count(); return(ELLIPSIS); }
">>="                     { count(); return(RIGHT_ASSIGN); }
"<<="                     { count(); return(LEFT_ASSIGN); }
"+="                    { count(); return(ADD_ASSIGN); }
"-="                    { count(); return(SUB_ASSIGN); }
"*="                    { count(); return(MUL_ASSIGN); }
"/="                    { count(); return(DIV_ASSIGN); }
"%="                    { count(); return(MOD_ASSIGN); }
"&="                        { count(); return(AND_ASSIGN); }
"^="                    { count(); return(XOR_ASSIGN); }
"|="                    { count(); return(OR_ASSIGN); }
">>"                      { count(); return(RIGHT_OP); }
"<<"                      { count(); return(LEFT_OP); }
"++"                    { count(); return(INC_OP); }
"--"                    { count(); return(DEC_OP); }
"->"                 { count(); return(PTR_OP); }
"&&"                    { count(); return(AND_OP); }
"||"                    { count(); return(OR_OP); }
"<="                 { count(); return(LE_OP); }
">="                 { count(); return(GE_OP); }
"=="                    { count(); return(EQ_OP); }
"!="                    { count(); return(NE_OP); }
";"                     { count(); return(';'); }
("{"|"<%")           { count(); return('{'); }
("}"|"%>")           { count(); return('}'); }
","                     { count(); return(','); }
":"                     { count(); return(':'); }
"="                     { count(); return('='); }
"("                     { count(); return('('); }
")"                     { count(); return(')'); }
("["|"<:")           { count(); return('['); }
("]"|":>")           { count(); return(']'); }
"."                     { count(); return('.'); }
"&"                 { count(); return('&'); }
"!"                     { count(); return('!'); }
"~"                     { count(); return('~'); }
"-"                     { count(); return('-'); }
"+"                     { count(); return('+'); }
"*"                     { count(); return('*'); }
"/"                     { count(); return('/'); }
"%"                     { count(); return('%'); }
"<"                  { count(); return('<'); }
">"                  { count(); return('>'); }
"^"                     { count(); return('^'); }
"|"                     { count(); return('|'); }
"?"                     { count(); return('?'); }

[ \t\v\n\f]             { count(); }
.                       { /* ignore bad characters */ }

%%


yywrap()
{
        
        return(1);
}


comment()
{
        char c, c1;

loop:
        while ((c = input()) != '*' && c != 0) 

        if ((c1 = input()) != '/' && c != 0)
        {
                unput(c1);
                goto loop;
        } 
}


int column = 0;

void count()
{
        int i;

        for (i = 0; yytext[i] != '\0'; i++)
                if (yytext[i] == '\n')
                        column = 0;
                else if (yytext[i] == '\t')
                        column += 8 - (column % 8);
                else
                        column++;

        ECHO;
}


int check_type()
{
        return(IDENTIFIER);
}

%{
#include <stdio.h>
#include "common.h"
%}

%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

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

%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 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
        ;
        
%%
#include <stdio.h>

extern char yytext[];
extern int column;
extern FILE * yyin;

void yyerror(const char *str)
{
        fprintf(stderr,"error: %s\n",str);
}

int main(char argc, char ** argv)
{ 
    yyin = fopen(argv[1], "r");    
    yyparse(); 
    fclose(yyin);
    return 0;
}