%{
/* need this for the call to atof() below */
#include <math.h>
#include "mp4.tab.h"
int line=1;
int pos =0;
int id_count=0;
int int_count=0;
int float_count=0;
int char_count=0;
int string_count=0;
int op_count=0;
int key_count=0;
int i=0;
int save=0;
int flag=0;
%}

	
DIGIT    [0-9]
ID       [a-zA-Z_][a-zA-Z0-9_]*
X	 [0-7]

%%
"//"[^\n]*     /* eat up one-line comments */

"/*"([^*]*|[*][^/])*"*/" 		{
				for(i=0;i<strlen(yytext);i++)
					{
						if(yytext[i]=='\n')
							{line++;
							pos=0;
							}
						else
							pos++;
					}
					}


"\""([^\"\\\n'?]|[\\]([\'\?fortn\"\\\n]|{X}{1,3}))*"\"" {
		save=pos;
		for(i=0;i<strlen(yytext);i++)
			{
				if( (yytext[i]=='\\' && yytext[i+1]=='\n')) 
				{i=i+2;line++;pos=0;flag=1;}
				pos++;
			}

		if(flag==0)
		pos = pos + strlen(yytext);	
		
		string_count++;
		return string;
		
			}
		
"'"([^\n\t\\\"?']|[\\]([trxonf\\\?\'\"]|{X}{1,3}))"'"	 {
		pos=pos+strlen(yytext);
		char_count++;
		return charconst;
			}			

{DIGIT}+    {
		   pos = pos + strlen(yytext);	
		   int_count++;
		return num;
            }

{DIGIT}+"."{DIGIT}*|{DIGIT}*"."{DIGIT}+        {
		    pos = pos + strlen(yytext);	
		    float_count++;
		    return num;
            }

int	{return INT;}

void	{return VOID;}

char	{return CHAR;}

cin	{return CIN;}

cout	{return COUT;}

if	{return IF;}

else	{return ELSE;}

while	{return WHILE;}

public	{return PUBLIC;}

private	{return PRIVATE;}

for	{return FOR;}

class	{return CLASS;}

return	{return RETURN;}

break	{return BREAK;}

"<<"	{return OUT;}

">>"	{return IN;}

"->"	{return INS;}

"||"	{return OR;}

"&&"	{return AND;}

"<="	{return LE;}

">="	{return GE;}

"!="	{return NE;}

"=="	{return EE;}



{ID}      {
  	pos = pos + strlen(yytext);	
	id_count++;
	return ident;
	}

"+"|"-"|"*"|"/"|"{"|"}"|"("|")"|"|"|"||"|"&"|'%'|"!"|";"|"="|""	{
	pos = pos + strlen(yytext);	
	op_count++;
	return yytext[0];
	}
"."|":"|"["|"]"|","|"%"	{
	pos = pos + strlen(yytext);	
	op_count++;
	return yytext[0];
	}



[\n]    {line++;pos=0;}     	

[ ]	{pos++;}

[\t]	{pos=pos+8;}	

.           {printf( "Unknown token:\t");
		for(i=0;i<strlen(yytext);i++)
			printf("%o",yytext[i]);
            printf("\t\t\t%d\t%d\n",line,pos );
		pos = pos+strlen(yytext);
		return yytext[0];
		}
%%
main( argc, argv )
int argc;
char **argv;
    {
    ++argv, --argc;  /* skip over program name */
    if ( argc > 0 )
            {
	    yyin = fopen( argv[0], "r" );
	    	if(yyin==0)
			{
			printf("file not found\n");
			return;
			}
		}
    else
            {printf("syntax: lex <filename>\n");
	 /*  yyin = stdin;*/
	  return;
	     }	

    yyparse();
    printf("parsing  completed\n");
   
    	
      }