完成 Error定义和ErrorLog. 以及一些相关的东西

src/SourceManager/SourceManager.hpp

@@ -0,0 +1,56 @@
+#pragma once
+
+#include <Deps/Deps.hpp>
+#include <Core/SourceLocations.hpp>
+
+#include <fstream>
+
+namespace Fig
+{
+    class SourceManager
+    {
+    private:
+        String filePath;
+        String source;
+        std::vector<String> lines;
+
+    public:
+        bool read = false;
+        String &Read()
+        {
+            std::fstream fs(filePath.toStdString());
+            if (!fs.is_open())
+            {
+                read = false;
+                return source;
+            }
+            std::string line;
+            while (std::getline(fs, line))
+            {
+                source += line + '\n';
+                lines.push_back(String(line));
+            }
+            read = true;
+            return source;
+        }
+
+        SourceManager() {}
+        SourceManager(String _path) { filePath = std::move(_path); }
+
+        bool HasLine(int64_t _line) const
+        {
+            return _line <= lines.size() && _line >= 1;
+        }
+
+        String GetLine(size_t _line) const
+        {
+            assert(_line <= lines.size() && "SourceManager: GetLine failed, index out of range");
+            return lines[_line - 1];
+        }
+
+        String GetSub(size_t _index_start, size_t _length) const
+        {
+            return source.substr(_index_start, _length);
+        }
+    };
+};