%{
/* In der Vorlesung am 4.12.2006 gemeinsam erstellte Lösung für einen
 * C-Quellcode-Zähler.
 */
#include <stdio.h>

int comments = 0, ccode = 0, wspace = 0;
int commentFlag = 0, ccodeFlag = 0;
%}
%x COMMENT
%x STRING
%option noyywrap
%%
<*>\n		{
		  if (!commentFlag && !ccodeFlag)
		    wspace++;
		  else if (!ccodeFlag)
		    comments+=commentFlag;
		  else
		    ccode+= ccodeFlag;
		  commentFlag=0;
		  ccodeFlag=0;
		}
"/*"		{
		  BEGIN COMMENT;
		  commentFlag = 1;
		}
"\""		{ ccodeFlag = 1; BEGIN STRING; }
<STRING>"\""	{ ccodeFlag = 1; BEGIN INITIAL; }
<INITIAL,STRING>"\\\""	ccodeFlag = 1;
<INITIAL,STRING>"\\\\"	ccodeFlag = 1;
<STRING>.	ccodeFlag = 1;
[^ \t]		{
		  ccodeFlag = 1;
		}
<COMMENT>[^ \t]	{
		  commentFlag = 1;
		}
<COMMENT>"*/"	{
		  BEGIN INITIAL;
		  commentFlag = 1;
		}
<*>[ \t]	/* no-op */
%%
int main() {
	yylex();
	printf("%d Code-Zeilen, %d Nur-Kommentar-Zeilen, %d ganz leere Zeilen\n",
		ccode, comments, wspace);
}