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include/lexer.hpp

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+#pragma once
+#include <string>
+#include <list>
+
+class Lexer {
+ public:
+  struct LexerToken {
+    enum class Type {
+      None, Word, Semicolon, CurlyOpenBracket, CurlyCloseBracket,
+      RoundOpenBracket, RoundCloseBracket, Period, Commo, Plus, Minus, Star,
+      Slash, Equal, ExclamationMark, PlusEqual, MinusEqual, StarEqual,
+      SlashEqual, EqualEqual, ExclamationMarkEqual, PlusPlus, MinusMinus,
+      LAngle, RAngle, LAngleEqual, RAngleEqual, LArrow, RArrow, FOR, IF, ELSE,
+      WHILE, StringLiteral
+    };
+    LexerToken() = default;
+    LexerToken(const LexerToken&) = default;
+    LexerToken(LexerToken&&) = default;
+    LexerToken(const Type& type, const std::string& info) : type(type), info(info) {}
+    LexerToken(const Type& type, std::string&& info) : type(type), info(info) {}
+    LexerToken(Type&& type, const std::string& info) : type(type), info(info) {}
+    LexerToken(Type&& type, std::string&& info) : type(type), info(info) {}
+
+    LexerToken& operator=(LexerToken&&) = default;
+    LexerToken& operator=(const LexerToken&) = default;
+
+    Type type;
+    std::string info;
+  };
+  using LexerTokenList = std::list<LexerToken>;
+
+  void ParseText(std::string&&);
+  void ParseText(const std::string&);
+
+  LexerTokenList GetTokens() const;
+ private:
+  void PushToken();
+  LexerTokenList tokens;
+
+  LexerToken::Type current_state = LexerToken::Type::None;
+  std::string current_info;
+};
+
+using LexerTokenList = Lexer::LexerTokenList;
+
+namespace std {
+std::string to_string(Lexer::LexerToken::Type);
+}