%pointer



type     "int"|"float"|"char"|"bool"
lletter  [a-z]
uletter  [A-Z]
digit    [0-9]
boolval  "true"|"false"

letter    {lletter}|{uletter}
validchar {letter}|{digit}|"_"|"-"
string    "\""({validchar}|" ")*"\""
number    ("-")?({digit})+("."({digit})+)?

equalsymbol  "="|"+="|"-="|"*="|"/="
multoperator "*"|"/"|"%"
addoperator  "+"|"-"

relop        "<"|">"|"<="|">="|"=="|"!="
logicop      "!"|"&&"|"||"


returnableitem   {id}|{string}|{number}|"'"{validchar}"'"
id               {lletter}{uletter}({validchar})*
idlistitem       {id}(" = "{returnableitem})?
idlist           {idlistitem}(", "{idlistitem})*
vardef           {type}" "{idlist}";"
constdef         "const "{type}" "({uletter})+" = "{returnableitem}";"
defblock         ^(({vardef}|{constdef})$)+


funccall                 ({string}".")?{string}"("({returnableitem}(", "{returnableitem})*)?")"
factor                   {id}|{number}|"("{expression}")"|{funccall}
expression               {factor}(" "({multoperator}|{addoperator})" "{factor})?
expressionassignment     {id}" "{equalsymbol}" "{expression}
assignment               {id}"++"|"++"{id}|{id}"--"|"--"{id}|{expressionassignment}
condition                {expression}" "{relop}" "{expression}(" "{logicop}" "{condition})?



        int num_lines = 0, num_chars = 0;

%%


{funccall}              fputs("functcall found: ", yyout); fputs(yytext, yyout); fputs("\n", yyout);REJECT;
{assignment}            fputs("Assignmen found: ", yyout); fputs(yytext, yyout); fputs("\n", yyout);REJECT;
{condition}             fputs("Condition found: ", yyout); fputs(yytext, yyout); fputs("\n", yyout);REJECT;
{expressionassignment}  fputs("ExprAssig found: ", yyout); fputs(yytext, yyout); fputs("\n", yyout);REJECT;
{expression}            fputs("Expressio found: ", yyout); fputs(yytext, yyout); fputs("\n", yyout);REJECT;
{factor}                fputs("Factor found: ", yyout); fputs(yytext, yyout); fputs("\n", yyout);REJECT;

{defblock}         fputs("Def Block found: ", yyout); fputs(yytext, yyout); fputs("\n", yyout);
{constdef}         fputs("Const def found: ", yyout); fputs(yytext, yyout); fputs("\n", yyout);
{vardef}           fputs("Varbl def found: ", yyout); fputs(yytext, yyout); fputs("\n", yyout);
{type}             fputs("Ty found: ", yyout); fputs(yytext, yyout); fputs("\n", yyout);
{idlist}           fputs("ID List found: ", yyout); fputs(yytext, yyout); fputs("\n", yyout);
{idlistitem}       fputs("ID List Item found: ", yyout); fputs(yytext, yyout); fputs("\n", yyout);
{returnableitem}   fputs("RI found: ", yyout); fputs(yytext, yyout); fputs("\n", yyout);
{id}               fputs("ID found: ", yyout); fputs(yytext, yyout); fputs("\n", yyout);



\n      ++num_lines; ++num_chars;
       ++num_chars;

%%


#include <stdio.h> 

int main(int argc, char **argv)
{
    int counter;
    char str[80];

    ++argv, --argc;  /* skip over program name */
    puts("The arguments to the program are:");
    if(argc < 2) return 2;

    for (counter=0; counter<argc; counter++)
        puts(argv[counter]);

    if ((yyin = fopen(argv[0], "r")) == NULL)
    {
        puts("Unable to open the file to be copied");
        return 1;
    }
    if ((yyout = fopen(argv[1], "w")) == NULL)
    {
        puts("Unable to open the output file");
        return 1;
    }


    yylex();

    sprintf( str, "# of lines = %d, # of chars = %d",num_lines, num_chars );
    puts(str);
    fputs (str, yyout);


    return 0;

}
yywrap(){return 1;}