Notes

#include <iostream>
#include <string>
#include <fstream>
#include <streambuf>

using namespace std;

unsigned long hashWord(string str)
{
unsigned long hash = 5381;
int c;

for (char &c : str) {
hash = ((hash << 5) + hash) + c;
}

return hash;
}

bool isNum(const string& s)
{
std::string::const_iterator it = s.begin();
while (it != s.end() && isdigit(*it)) ++it;
return !s.empty() && it == s.end();
}

string getValue(string token) {
string reserved[13] = { "read", "write", "if", "then", "else", "end", "repeat", "until", "break", "#", "include", "int", "main" };
char specials[9] = { '+', '-', '*', '/' };
if (token == ">" || token == "<" || token == "==" || token == "<=" || token == ">=") {
return "relational";
}
if (token == "+" || token == "-" || token == "*" || token == "/" || token == "%") {
return "arithmetic";
}
if (token == "{" || token == "}" || token == ";" || token == ":" || token == ":=" || token == "(" || token ==")" || token == "," || token == """ ) {
return "punctuation";
}
for (int i = 0; i < 13; i++) {
if (token == reserved[i]) {
return "keyword";
}
}
if (isNum(token)) {
return "number";
}
else {
return "identifier";
}


}

int main() {


ifstream t("Text.txt");
string str((std::istreambuf_iterator<char>(t)),
istreambuf_iterator<char>());

cout << "Name of Token" << " Value of Token " << " Hash Value" << endl;
string alphabets = "abcdefghijklmnopqrstuvwxyz";
string nums = "1234567890";
string stack = "";
int length = str.length();
int i = 0;
Start:
if (i < length) {
char current = str[i];
//cout << current;
if (current == ' ' || current == 'n' || current == 't') {
i++;
goto Start;
}
else if (current == '{') {
i++;
goto Comment;
}
else if (isalpha(current)) {
goto ALPHA;
}
else if (isdigit(current)) {
goto NUMBER;
}
else if (current == ':') {
stack.append(1u, current);
i++;
goto OP;
}
else {
stack.append(1u, current);
goto Final;
}
}
NUMBER:
if (i < length) {
char current = str[i];
//cout << current;
if (isdigit(current)) {
stack.append(1u, current);
if (str[i + 1] == ';') {
goto Final;
}
else {
i++;
}
goto NUMBER;
}
else if (current != ' ' || current != 'n' || current != 't') {
stack.append(1u, current);
goto Final;
}
else {
//stack.append(1u, current);
goto Final;
}
}
ALPHA:
if (i < length) {
char current = str[i];
//cout << current;
if (isalpha(current)) {
stack.append(1u, current);
if (str[i + 1] == ';') {
goto Final;
}
i++;
goto ALPHA;
}
else {
//stack.append(1u, current);
goto Final;
}
}
OP
if (i < length) {
char current = str[i];
//cout << current;
if (current == '=') {
stack.append(1u, current);
goto Final;
}
else {
stack.append(1u, current);
goto Final;
}
}
Comment:
if (i < length) {
char current = str[i];
//cout << current;
if (current == '}') {
i++;
goto Start;
}
else {
i++;
goto Comment;
}
}
Final:
if (i < length) {

cout << stack << "t t" << getValue(stack) << "t t" << hashWord(stack) << endl;
stack = "";
i++;
goto Start;
}

system("pause");
return 0;
}