#include <iostream>
#include <fstream>
using namespace std;
char RW[10];
char id[10];
void populateArray(char ch, int &i, char * array);
void valid(char *array, int i);
#define MINUS '-'
#define PLUS '+'
#define TIMES '*'
#define DIVIDE '/'
#define EQL '='
#define LP '('
#define RP ')'
#define SEMIC ';'
#define LSS '<'
#define GTR '>'
#define COMMA ','
#define DOLLAR '$'
// parser
char getsym();
void func_e(char &sym);
void funcc_t(char &sym);
void func_S(char &sym);
void func_E(char &sym);
void func_T(char &sym);
void func_F(char &sym);
int main()
{
int i = 0;
char ch = 'i';
char nextsym;
char array[10];
ifstream infile;
cout << "welcome to the Lexical Scanner" << endl;
//this bit is the lexcial scanner input from a file. Not used
/* infile.open("new.txt");
if(infile.fail())
{
cout << "unable to load sourcefile" << endl;
exit(1);
}
else
{
while((ch = infile.get()) != EOF )
{
if ( ch != ' ') // strip out whitespaces from txt
{
populateArray(ch, i, array);
}
}
}*/
valid(array,i);
cout << "\n\n\nHandling input to the parser \n\n"<<endl;
nextsym = getsym();
func_T(nextsym);
return 0;
}
char getsym()
{
static char array[5] = "a*b$";
static int i = -1;
++i;
return array[i];
}
void func_e(char &sym)
{
cout << "in funct_e, checking for +: " << sym << endl;
if(sym == '+')
{
sym=getsym();
func_T(sym);
func_e(sym);
}
}
void funcc_t(char &sym)
{ cout << "In funct_t, checking for * = " << sym << endl;
if(sym=='*')
{
sym=getsym();
func_F(sym);
func_T(sym);
}
}
void func_S(char &sym)
{
//func_E(sym);
if(sym!='$')
{
cout << "error missing dollar"<<endl;
exit(1);
}
else
{
cout << "Parse sucesfful" << endl;
exit(1);
}
}
void func_E(char &sym)
{
funcc_t(sym);
func_e(sym);
}
void func_T(char &sym)
{
func_F(sym);
funcc_t(sym);
}
void func_F(char &sym)
{
//cout << "In funct_F, checking for id: = " << sym << endl;
//char id;
// for(int i = 0; i<3; i++)
// {
// cout << "going through the loop" << endl;
//if(sym==RW[i])
//{
cout << "Error on the input stream, ID expected" << endl;
// func_S(sym);
//}
//}
/*id = sym;
if(sym==id){}
//sym=getsym();
else
if(sym=='(')
{
//sym=getsym();
// func_E(sym);
if(sym==')'){}
// sym=getsym();
else
{
cout << "error missing brackets" <<endl;
exit(1);
}
}
else
{
cout << "error missing id" <<endl;
exit(1);
}
*/
}
void populateArray(char ch, int &i ,char *array)
{
array[i] = ch;
i++;
}
void valid(char * array, int i )
{
int j = 0;
int h = 0;
int c = 0;
while(j<i)
{
switch(array[j])
{
case PLUS:
cout << "its a plus" <<endl;
RW[h] = PLUS;
h++;
break;
case MINUS:
cout << "minus found" <<endl;
RW[h] = MINUS;
h++;
break;
case TIMES:
cout << "Times found" <<endl;
RW[h] = TIMES;
h++;
break;
case DIVIDE:
cout << "Divide found" <<endl;
RW[h] = DIVIDE;
h++;
break;
case EQL:
cout << "Equals found " <<endl;
RW[h] = EQL;
h++;
break;
case LP:
cout << "LP ( found" << endl;
RW[h] = LP;
h++;
break;
case RP:
cout << "RP ) found" << endl;
RW[h] = RP;
h++;
break;
case SEMIC:
cout << "semiclon found" << endl;
strcpy(&RW[h],"SEMIC");
h++;
break;
case LSS:
cout << "Less than found < " << endl;
RW[h] = LSS;
h++;
break;
case GTR:
cout << "Greater than found " << endl;
RW[h] = GTR;
h++;
break;
case 'i': // reconize if's
if (array[++j] == 'f')
cout << "if" <<endl;;
strcpy(&RW[h],"if");
h++;
break;
case 'e': // reconize else's
if (array[++j] == 'l')
{
if(array[++j] == 's')
{
if(array[++j] == 'e')
{
cout << "else found" << endl;
strcpy(&RW[h],"else");
h++;
}
}
}
break;
case 't':
if (array[++j] == 'h')
if(array[++j] == 'e')
if(array[++j] == 'n')
cout << "then found" << endl;
strcpy(&RW[h],"then");
h++;
break;
case 'f':
if (array[++j] == 'u')
if(array[++j] == 'n')
if(array[++j] == 'c')
if (array[++j] == 't')
if(array[++j] == 'i')
if(array[++j] == 'o')
if(array[++j] == 'n')
cout << "function found " <<endl;
strcpy(&RW[h],"function");
h++;
break;
case DOLLAR:
cout << "its a dollar" << endl;
RW[h] = DOLLAR;
h++;
break;
default:
{
id[c] = array[j];
c++;
}
}
}
j++;
}why is it when theres nothing in func_F thats funcc_t() gets called? I cant work out where its been called from. Really bugging me Can anyone help please?
