FLEX C++ yytext function

Question

The code isn't wrote in English(variable names, but that shouldn't be a problem). The yytext function doesn't copy what I want to copy. Here is the relevant code from.l file:

`progr: declaratii bloc {printf("program corect sintactic\n");}
     ;

declaratii :  declaratie ';'
       | declaratii declaratie ';'
       | declaratii structura 
       | declaratii clasa ';'
       | declaratii function 
       | function
       | clasa ';'
       | structura 
       ;

declaratie : INT var_int 
           | INT lista_int
           | CHAR var_char
           | CHAR lista_char
           | FLOAT var_float
           | FLOAT lista_float
           | STRING var_string
           | STRING lista_string
           | BOOL var_bool
           | BOOL lista_bool
           ;

lista_int : ID '(' lista_param_int ')' {add("lista", "int");}
     | ID '(' ')' {add("lista", "int");}
     | lista_int ',' ID '(' lista_param_int ')' {add("lista", "int");}
     | lista_int ',' ID '(' ')' {add("lista", "int");}
     ;
var_int : ID {add("var", "int");}
     | var_int ','  ID {add("var", "int");}
     ;
lista_param_int : INT ID 
            | lista_param_int ',' INT ID 
            ;

lista_char : ID '(' lista_param_char ')' {add("lista", "char");}
     | ID '(' ')' {add("lista", "char");}
     | lista_char ',' ID '(' lista_param_char ')' {add("lista", "char");}
     | lista_char ',' ID '(' ')' {add("lista", "char");}
     ;


void add(char * tip, char * tipDate){
     symbol_table[contor].nume = strdup(yytext) ;
     symbol_table[contor].tip = tip;
     symbol_table[contor].tipDate = tipDate;
     contor++;
}

Here is the text file (input):

class Test{
    private:
        int @x;
    public:
        int @z;
    protected:
        char @o;
        int @tr2;
    protected:
        float @k;
        int @dasdas(int @var23);
};
struct structura{
    char @nume;
    char @tip;
};

float functie($int @var0 : char @sir : bool @binar){
    $int @var1;
    $@var1 := 1;
    $if'(@var1 :== 1){
        @var1 := 2;
        if'(@var1 :== 2){
            @var1 := 3;
        }
    }
    $@var1 := 8;
    $int @var2;
    $int @var3, @var4;
    $@var2 := 6;
}

int @a, @b, @c;
int @xz, @dsada;
int @d(), @xsadas(int @arata);
char @c;
begin_progr
@a := 3;
if'(@a :== 3){
    @a := 2;
}
end_progr

And there is the output (It copys corectly only the variables which are after the ',' as you see):

nume      tip      tipDate
;          var      int      
;          var      int      
;          var      char      
;          var      int      
;          var      float      
)          lista      int      
;          var      char      
;          var      char      
:          var      int      
:          var      char      
)          var      bool      
;          var      int      
;          var      int      
,          var      int      
@var4          var      int      
,          var      int      
@b          var      int      
@c          var      int      
,          var      int      
@dsada          var      int      
)          lista      int      
)          lista      int      
;          var      char   

Answer 1

yytext is a variable, not a function. Moreover, it's a variable whose value is only available inside a (f)lex action.

Making a copy of yytext inside a parser action is way too late. You have to do it in the lexer action.

Every time the lexer is asked for a new token, it overwrites yytext , so at best yytext is the last token in the production. But it might be the next token, because sometimes the parser needs to look at the next token before it knows it can reduce a production.