Anonymous

%{#include <string.h>#include <unistd.h>#include "lingo.tab.h"int linecount = 1;int errors;%}white 		[ \t]letter		[A-Za-z]digit		[0-9]hex		{digit}|[a-fA-F]valid_char	[^\n\"\'\\]|\\n|\\t|\\\'|\\\"|\\\\|\\{hex}{2}invalid_char	\\[^nt\'\"\\]startcom	"(*"endcom		"*)"identifier 	{letter}({letter}|{digit})*number		{digit}+%x		COMMENT%%{white}* 	{ /* white space. Do nothing */ }\n		{ linecount++; }byte		{ return BYTE; }delete		{ return DELETE; }else		{ return ELSE; }false		{ return FALSE; }if		{ return IF; }int		{ return INT; }new		{ return NEW; }null		{ return NULL_WORD; }proc		{ return PROC; }reference	{ return REFERENCE; }return		{ return RETURN; }while		{ return WHILE; }with		{ return WITH; }true		{ return TRUE; }"+"		{ return '+'; }"-"		{ return '-'; }"*"		{ return '*'; }"/"		{ return '/'; }"%"		{ return '%'; }"="		{ return '='; }"=="		{ return EQUAL; }"!="		{ return NOTEQUAL; }">="		{ return GREQUAL; }"<="		{ return LEEQUAL; }">"		{ return '>'; }"<"		{ return '<'; }"|"		{ return '|'; }"&"		{ return '&'; }"!"		{ return '!'; }"("		{ return '('; }")"		{ return ')'; }"["		{ return '['; }"]"		{ return ']'; }"}"		{ return '}'; }"{"		{ return '{'; }","		{ return ','; }";"		{ return ';'; }":"		{ return ':'; }{number}	{ if (atol(yytext)<=32768) return NUMBER;		  errors++; return INVALID_NUMBER; }\'{valid_char}?\'	{ return CONST_BYTE; }\"{valid_char}*\"	{ return CONST_STRING; }\"({valid_char}|{invalid_char})+\"	{ errors++; return INVALID_STRING; }\"|\'			{ errors++; return UNMATCHED_QUOTE; }{identifier} { return IDENTIFIER;}{digit}({digit}|{letter})*	{ errors++; return ILLEGAL_IDENTIFIER; }{startcom}		{ BEGIN(COMMENT); }<COMMENT>{endcom}	{ BEGIN(INITIAL); }<COMMENT>\n		{ linecount++; }<COMMENT>{startcom}	{ errors++; return NESTED_COMMENT; }<COMMENT><<EOF>>	{ errors++; return NO_END_OF_COMMENT; }<COMMENT>.		{ /* inside comment. Do nothing */ }{endcom}		{ errors++; return NO_START_OF_COMMENT; }.			{ errors++; return GENERIC_ERROR; }%%/*Gia th fash ths syntaktikhs analyshs h main 9a anaptyx9ei ek neou sto arxeio prodiagrafwn tou syntaktikou analyth.Edw thn exw afhsei ypo morfh sxoliwn gia na deite pws htan h main toy lektikou analyth*/int main(int argc, char *argv[]){ char buffer[80]; int token=0; FILE *in_file; argc--; argv++; if (!argc) { 		sprintf(buffer,"Dose onoma arxeioy\n");	write(1,buffer,strlen(buffer));	return 1; }  if ( (in_file = fopen(argv[0],"r")) == NULL ) {  	perror("Error opening file");	return 1; } yyrestart(in_file);  while ( ( token = yylex() ) != 0 ) {		if (token == -4) {		sprintf(buffer,"No end of comment\n");		write(1,buffer,strlen(buffer));		return 1;	}	sprintf(buffer,"(%d)Token %d : %s\n",linecount,token,yytext);	write(1,buffer,strlen(buffer)); } sprintf(buffer,"Arithmos grammon : %d\n",linecount); write(1,buffer,strlen(buffer)); sprintf(buffer,"Arithmos lathon : %d\n",errors); write(1,buffer,strlen(buffer)); return 0;}