[Feat] 详细区分左值(LvObject)与右值(RvObject -> ObjectPtr)

[Impl] 重构evaluator.cpp + hpp 全部
[Feat] 增加对于IndexExpr的解析
[Fix][Impl] 现在点运算符不由BinaryExpr负责,增加MemberExpr,单独实现解析
[Impl] 项目目录全部翻修, src/目录下单独文件夹放置每一个模块

src/Lexer/lexer.hpp

@@ -0,0 +1,94 @@
+#pragma once
+
+#include <corecrt.h>
+#include <cuchar>
+#include <cwctype>
+#include <unordered_map>
+#include <vector>
+
+#include <Token/token.hpp>
+#include <Error/error.hpp>
+#include <Core/fig_string.hpp>
+#include <Core/utf8_iterator.hpp>
+#include <Core/warning.hpp>
+
+namespace Fig
+{
+
+    class Lexer final
+    {
+    private:
+        size_t line;
+        const FString source;
+        SyntaxError error;
+        UTF8Iterator it;
+
+        std::vector<Warning> warnings;
+
+        size_t last_line, last_column, column = 1;
+
+        bool hasNext()
+        {
+            return !this->it.isEnd();
+        }
+
+        void skipLine();
+        inline void next()
+        {
+            if (*it == U'\n')
+            {
+                ++this->line;
+                this->column = 1;
+            }
+            else
+            {
+                ++this->column;
+            }
+            ++it;
+        }
+
+        void pushWarning(size_t id, FString msg)
+        {
+            warnings.push_back(Warning(id, std::move(msg), getCurrentLine(), getCurrentColumn()));
+        }
+        void pushWarning(size_t id, FString msg, size_t line, size_t column)
+        {
+            warnings.push_back(Warning(id, std::move(msg), line, column));
+        }
+
+    public:
+        static const std::unordered_map<FString, TokenType> symbol_map;
+        static const std::unordered_map<FString, TokenType> keyword_map;
+
+        inline Lexer(const FString &_source) :
+            source(_source), it(source)
+        {
+            line = 1;
+        }
+        inline size_t getCurrentLine()
+        {
+            return line;
+        }
+        inline size_t getCurrentColumn()
+        {
+            return column;
+        }
+        SyntaxError getError() const
+        {
+            return error;
+        }
+        std::vector<Warning> getWarnings() const
+        {
+            return warnings;
+        }
+        Token nextToken();
+
+        Token scanNumber();
+        Token scanString();
+        Token scanRawString();
+        Token scanMultilineString();
+        Token scanIdentifier();
+        Token scanSymbol();
+        Token scanComments();
+    };
+} // namespace Fig