can now parse identifiers and integer literals

src/ast/expressions/integer.cpp

@@ -0,0 +1,15 @@
+#include "integer.hpp"
+
+namespace ast {
+    integer_literal::integer_literal(token::token token, int value)
+        : token(std::move(token)),
+          value(value) {}
+
+    std::string integer_literal::token_literal() const {
+        return token.literal;
+    };
+
+    std::string integer_literal::str() const {
+        return token.literal;
+    };
+} // namespace ast

src/ast/expressions/integer.hpp

@@ -0,0 +1,15 @@
+#pragma once
+
+#include "ast/ast.hpp"
+#include "token/token.hpp"
+
+namespace ast {
+    struct integer_literal : expression {
+        integer_literal(token::token token, int value);
+        token::token token;
+        int value;
+
+        std::string token_literal() const override;
+        std::string str() const override;
+    };
+} // namespace ast