テキストエディタの作成で文字列データの持たせ方が知りたい

提示コードですが改行関数と文字と文字の間に文字を挿入する関数を作成したのですがこれだと下記の問題点のよな問題が発生するのですがどういったやり方をするのが定番なのでしょうか？

参考サイト：https://www.tohoho-web.com/ex/regexp.html#:~:text=%E3%83%AA%E3%83%B3%E3%82%AF-,%E6%AD%A3%E8%A6%8F%E8%A1%A8%E7%8F%BE%E3%81%A8%E3%81%AF,%E3%81%84%E3%82%8B%E3%82%82%E3%81%AE%E3%81%8C%E7%95%B0%E3%81%AA%E3%82%8A%E3%81%BE%E3%81%99%E3%80%82

問題点

このような文字列の操作をしているとカッコの自動挿入や補填やシンタックスハイライトなど実装がむずかしくなる

知りたいこと

テキストエディタの作成でどう文字列をいじればいいか知りたい

cpp
1#include "MainScreen.hpp"
2#include <Magick++.h>
3#include "memory.h"
4#include "../../LibConsole/lib_src/Console.hpp"
5#include <ncurses.h>
6#include <iostream>
7#include <filesystem>
8#define CTRL(x) ((x) & 0x1f)
9#define LINE_BUFFER ((int)1000)
10#define byte char
11
12
13MainScreen::MainScreen()
14{
15    setlocale(LC_ALL, "");  //日本語利用
16    
17    //cbreak();
18    //nocbreak();
19    //noecho();
20//    echo();
21    GetFileData();
22
23cursorPosition = glm::ivec2(0,0);
24
25logo = std::string(R"(
26 ______        __                  
27/_  __/____ __/ /_                 
28 / / / -_) \ / __/                 
29/_/  \__/_\_\\__/  ___ __          
30           / __/__/ (_) /____  ____
31          / _// _  / / __/ _ \/ __/
32         /___/\_,_/_/\__/\___/_/   
33                                
34)");
35
36}
37
38std::string MainScreen::DragAndDrop()
39{
40    std::string p = Console::InputString();
41    
42    if(p.length() > 3)
43    {
44        p.erase(0,1);   
45        p.pop_back();
46        p.pop_back();     
47
48        return p;
49    }
50    else
51    {
52        return std::string("");
53    }
54    
55
56    return std::string("");
57}
58
59
60bool MainScreen::getExit()
61{
62    return isExit;
63}
64
65void MainScreen::GetFileData()
66{
67    std::string fileName = "Main.cpp";
68    FILE *fp = fopen(fileName.c_str(),"a+");
69
70
71    if(fp != NULL)
72    {
73        char str[LINE_BUFFER];
74        
75        while(fgets(str,LINE_BUFFER,fp) != NULL)
76        {
77            file.push_back(new char[LINE_BUFFER]);
78            //file.push_back(str);
79
80            memcpy(file.back(),str,LINE_BUFFER);
81        }
82        
83    }
84    else
85    {
86
87    }
88
89    for(int i = 0; i < file.size(); i++)
90    {
91        Console::Draw(Console::ColorCode::White,Console::ColorCode::Black,nullptr,"%s",file.at(i));
92    }
93}
94
95void MainScreen::LineSpacing(int key)
96{
97    char str[LINE_BUFFER] = {'\0'};    
98    int t = strlen(file.at(cursorPosition.y));
99    int len = t - cursorPosition.x;     //文字列の長さ
100    
101    for(int i = 0; i < len; i++)
102    {
103        str[i] = file.at(cursorPosition.y)[cursorPosition.x + i];
104    }
105
106    file.at(cursorPosition.y)[strlen(file.at(cursorPosition.y)) + 1] = '\0';
107    file.at(cursorPosition.y)[strlen(file.at(cursorPosition.y)) + 2] = '\n';
108    file.at(cursorPosition.y)[cursorPosition.x] = (char)key;
109    cursorPosition.x += 1;
110
111    Console::Debug::WriteLog("aaa   %s\n",str);
112
113    for(int i = 0; i < strlen(str); i++)
114    {
115        file.at(cursorPosition.y)[cursorPosition.x + i] = str[i];
116    }
117
118}
119
120void MainScreen::NewLine()
121{
122    char str[LINE_BUFFER] = {'\0'};    
123    int t = strlen(file.at(cursorPosition.y));
124    int len = t - cursorPosition.x;     //文字列の長さ
125
126    for(int i = 0; i < len; i++)
127    {
128        str[i] = file.at(cursorPosition.y)[cursorPosition.x + i];
129    }
130    str[len] = '\0';
131
132    for(int i = 0; i < t; i++)
133    {
134        file.at(cursorPosition.y)[cursorPosition.x + i] = '\0';
135    }
136
137    file.at(cursorPosition.y)[strlen(file.at(cursorPosition.y))] = '\n';    //改行挿入
138    
139    std::vector<char*> line;
140    for(int i = 0; i < (file.size() - cursorPosition.y); i++)
141    {
142        line.push_back(new char[LINE_BUFFER]);
143        strcpy(line.back(),file.at(cursorPosition.y + i));
144    }
145
146    int total = (file.size() - cursorPosition.y);
147    file.push_back(new char[LINE_BUFFER]);
148    for(int i = 0; i < line.size(); i++)
149    {        
150        strcpy(file.at(cursorPosition.y + i + 1),line.at(i));
151    }
152    
153    for(int i = 0; i < strlen(str); i++)
154    {
155        file.at(cursorPosition.y + 1)[i] = str[i];
156    }
157
158    //file.at(cursorPosition.y) = "\0";
159    cursorPosition.x = 0;
160    cursorPosition.y += 1;
161}
162
163
164void MainScreen::Loop()
165{
166    Console::ClearBuffer(NULL);
167
168    for(int i = 0; i < file.size(); i++)
169    {
170        Console::Draw(Console::ColorCode::White,Console::ColorCode::Black,nullptr,"%s",file.at(i));
171    }
172
173    
174    move(cursorPosition.y,cursorPosition.x);
175    int key = getch();
176    if(key == KEY_ESC)
177    {
178        isExit = true;
179    }
180    else if( key == KEY_DOWN)
181    {
182        cursorPosition.y += 1;
183    }
184    else if( key == KEY_UP)
185    {
186        cursorPosition.y += -1;
187    }
188    else if( key == KEY_RIGHT)
189    {
190        cursorPosition.x += 1;
191    }
192    else if( key == KEY_LEFT)
193    {
194        cursorPosition.x += -1;
195    }
196    else if( key == KEY_RETURN)
197    {
198        //Console::Debug::WriteLog("qqqq   \n");
199
200        NewLine();
201    }
202    else if( key == CTRL('x') )
203    {
204        Console::Debug::WriteLog("Save\n");
205    }
206    else if( (byte)(key << 4) & (byte)KEY_BACKSPACE )
207    {
208        Console::Debug::WriteLog("KEY_BACKSPACE   \n");
209
210    }   
211    else
212    {
213        //Console::Debug::WriteLog("ああああああ   \n");
214
215        LineSpacing(key);
216    }    
217
218
219        //Console::Debug::WriteLog("KEY_BACKSPACE   \n");
220
221}
222
223void MainScreen::SetFilePath(std::filesystem::path p)
224{
225    for (const std::filesystem::directory_entry& x : std::filesystem::recursive_directory_iterator(p.native())) 
226    {
227            if(std::filesystem::is_directory(x.path()) == false)
228            {
229                Console::Draw(Console::ColorCode::White,Console::ColorCode::Black,nullptr,"path %s\n",x.path().c_str());
230                filePath.push_back(std::string(x.path().c_str()));
231            }
232    }
233
234//    Console::Draw(Console::ColorCode::White,Console::ColorCode::Black,nullptr,"path \\n");
235
236}
237
238
239
240MainScreen::~MainScreen()
241{
242    for(int i = 0; i< file.size(); i++)
243    {
244        free(file.at(i));
245    }
246}
247