From 0cae53a3d119f71a18b878e6e8813aae65b8aca8 Mon Sep 17 00:00:00 2001
From: ChUrl <christoph.urlacher@protonmail.com>
Date: Tue, 21 Mar 2023 14:32:30 +0100
Subject: [PATCH] Update Token class with subtoken and int conversion

---
 src/lexer/Token.cpp | 20 ++++++++++++++++++++
 src/lexer/Token.h   | 13 ++++++++-----
 2 files changed, 28 insertions(+), 5 deletions(-)

diff --git a/src/lexer/Token.cpp b/src/lexer/Token.cpp
index 01712e3..fc51001 100644
--- a/src/lexer/Token.cpp
+++ b/src/lexer/Token.cpp
@@ -4,6 +4,7 @@
 
 #include <array>
 #include <string>
+#include <charconv>
 #include "Token.h"
 
 Token::Token(Token::Type type) : type(type) {}
@@ -23,6 +24,25 @@ auto Token::getTypeName() const -> std::string {
                                        "UNEXPECTED"}[type];
 }
 
+auto Token::subtoken(uint8_t pos, uint8_t len) const -> Token {
+    return std::move(Token(type, lexeme.substr(pos, len)));
+}
+
 Token::operator std::string_view() const {
     return lexeme;
 }
+
+Token::operator std::string() const {
+    return lexeme;
+}
+
+// https://stackoverflow.com/questions/56634507/safely-convert-stdstring-view-to-int-like-stoi-or-atoi#answer-65675200
+Token::operator uint8_t() const {
+    uint8_t out;
+    const std::from_chars_result result = std::from_chars(lexeme.data(), lexeme.data() + lexeme.size(), out);
+    if (result.ec == std::errc::invalid_argument || result.ec == std::errc::result_out_of_range)
+    {
+        throw "Conversion Error: Can't convert Token to uint8_t!";
+    }
+    return out;
+}
diff --git a/src/lexer/Token.h b/src/lexer/Token.h
index 2996589..3296b82 100644
--- a/src/lexer/Token.h
+++ b/src/lexer/Token.h
@@ -35,9 +35,9 @@ public:
 
     auto operator=(const Token &copy) -> Token & = default;
 
-    Token(Token &&move) = default;
+    Token(Token &&move) noexcept = default;
 
-    auto operator=(Token &&move) -> Token & = default;
+    auto operator=(Token &&move) noexcept -> Token & = default;
 
     ~Token() = default;
 
@@ -45,13 +45,16 @@ public:
 
     [[nodiscard]] auto getTypeName() const -> std::string;
 
+    [[nodiscard]] auto subtoken(uint8_t pos, uint8_t len) const -> Token;
+
     explicit operator std::string_view() const;
 
+    explicit operator std::string() const;
+
+    explicit operator uint8_t() const;
+
 private:
     Type type;
-
-    // ! The Token only contains a reference to the string kept inside the Lexer.
-    // ! If the Lexer is gone, all Tokens will be invalid!
     std::string lexeme;
 };