Added a skeleton for the lexer

src/include/lex.hpp

@@ -0,0 +1,36 @@
+#pragma once
+#include <sstream>
+#include <vector>
+#include <stdint.h>
+#include <variant>
+
+enum TokenType {
+    OpenParen,
+    CloseParen,
+    Symbol,
+    String,
+    Int,
+    End
+};
+
+// Plain Old Data
+struct Token {
+    enum TokenType type;
+    std::variant<int, std::string> value;
+};
+
+class Lexer {
+private:
+    // we use a stringstream for lexing purposes
+    std::stringstream ss;
+
+public:
+    Lexer(std::string);
+    Lexer();
+
+    void feed(std::string);
+    
+    Token next();
+    std::vector<Token> collect();
+};
+

src/lex.cpp

@@ -0,0 +1,16 @@
+#include <lex.hpp>
+#include <string>
+
+Lexer::Lexer(std::string s) : ss(s) {}
+Lexer::Lexer() : ss("") {}
+
+void Lexer::feed(std::string s) {
+    ss << s;
+}
+
+Token Lexer::next() {
+    return {TokenType::CloseParen};
+}
+
+
+

src/main.cpp

@@ -1,8 +1,10 @@
 #include <iostream>
+#include <lex.hpp>
+#include <sstream>
 
 using namespace std;
 
 int main() {
-    cout << "hi" << endl;
+    cout << "hi " << endl;
     return 0;
 }