Многострочная декларация комментариев с flex / bison

Question

Многострочная декларация комментариев с flex / bison

У меня сегодня проблема с моим скриптом flex / bison. Он не обнаруживает многострочный комментарий.

%x COMMENT_MULTI
#\[                     yy_push_state(COMMENT_MULTI);

<COMMENT_MULTI>"]#"     yy_pop_state();
<COMMENT_MULTI>"\n"     {
yylloc->lines(yyleng);
yylloc->step();
}
<COMMENT_MULTI>.?

Вы можете мне помочь?

1

bison c++comments interpreted-language

Решение

Другие решения

/*DECLARING A SPECIFIC STATE FOR THE BLOCK COMMENT*/
%x BLOCK_COMMENT
%%

\/\* { // BEGINING OF A BLOCK COMMENT: ENTERS INTO 'BLOCK_COMMENT' STATE
BEGIN(BLOCK_COMMENT);
blockcomment_line_start = line;
blockcomment_col_start = frcol;
strncat(block_comment, yytext, sizeof(block_comment));
}
<BLOCK_COMMENT>\*\/    {   // END OF BLOCK COMMENT
if(strlen(block_comment)+strlen(yytext) >= BLOCK_COMMENT_BUFFER-10){ //ADDS "(...)" AT THE END OF THE STRING IN CASE IT HAS BEEN TRUNCATED
block_comment[1013] = '\0';
strcat(block_comment," (...) ");
}
strncat(block_comment, yytext, sizeof(block_comment));
printf("@(%.3d,%.3d)\tBLOCK COMMENT\t- %s\n", blockcomment_line_start, blockcomment_col_start, block_comment);

BEGIN(INITIAL); //COMES BACK TO THE INITIAL STATE
}
<BLOCK_COMMENT>\n {
line++; // STILL HAS TO INCREMENT THE LINE NUMBER WHEN THERE'S A LINE BREAK INSIDE THE COMMENT
//strcat(block_comment, "\\n");
strncat(block_comment, "\\n", sizeof(block_comment));
}
<BLOCK_COMMENT>. { // IGNORE ALL OTHER CHARACTERS WHILE IN 'BLOCK_COMMENT' STATE
//strcat(block_comment, yytext);
strncat(block_comment, yytext, sizeof(block_comment));
}
<BLOCK_COMMENT><<EOF>> {
printf("ERROR! THE BLOCK COMMENT OPENED IN  @(%d,%d) HASN'T BEEN CLOSED! \t\n", blockcomment_line_start, blockcomment_col_start);
return;
}

-2

Источник

Accepted Answer

Это решение, которое я использовал в своем определении бизонов комментариев C ++ и комментариев к блокам:

%x COMMENT

"//".*\n                            ;

"/*"                                BEGIN(COMMENT);
<COMMENT>"/*"                       printf("%s%d\n", "Warning: multiple comments opened at line: ", yylineno);
<COMMENT>"*/"                       BEGIN(INITIAL);
<COMMENT>"EOF"                      yyerror("Reached end of file while scanning comment");
<COMMENT>.|"\n"                     ;

2