From a02162a444aaded4c833e881281d96eb147d5db4 Mon Sep 17 00:00:00 2001
From: dzhav <fataliev.ds@phystech.edu>
Date: Sat, 15 Apr 2023 11:01:18 +0300
Subject: [PATCH] dz_2

---
 task2/dz_2.cpp | 218 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 218 insertions(+)
 create mode 100644 task2/dz_2.cpp

diff --git a/task2/dz_2.cpp b/task2/dz_2.cpp
new file mode 100644
index 0000000..9be4373
--- /dev/null
+++ b/task2/dz_2.cpp
@@ -0,0 +1,218 @@
+#include <iostream>
+#include <fstream>
+#include <string>
+#include <memory>
+#include <utility>
+#include <vector>
+#include <sstream>
+
+class IOperation {
+ public:
+  virtual void ProcessLine(const std::string &str);
+  virtual void HandleEndOfInput() = 0;
+  virtual void SetNextOperation(std::unique_ptr<IOperation> nextOperation) = 0;
+  virtual std::unique_ptr<IOperation> GetNextOperation() { return nullptr; };
+ private:
+  std::unique_ptr<IOperation> nextOperation_ = nullptr;
+
+};
+void IOperation::ProcessLine(const std::string &str) {
+
+}
+
+class CatOperation : public IOperation {
+ public:
+  explicit CatOperation(std::string filename) : filename_(std::move(filename)) {}
+
+  void ProcessLine(const std::string &str) override {
+    std::cout << str << std::endl;
+  }
+
+  void HandleEndOfInput() override {
+    std::ifstream file(filename_);
+    if (file.is_open()) {
+      std::string line;
+      while (std::getline(file, line)) {
+        std::cout << line << std::endl;
+      }
+      file.close();
+    }
+    else {
+      std::cerr << "Failed to open file: " << filename_ << std::endl;
+    }
+    if (nextOperation_ != nullptr) {
+      auto a = std::move(nextOperation_);
+      a->HandleEndOfInput();
+    }
+  }
+
+  void SetNextOperation(std::unique_ptr<IOperation> nextOperation) override {
+    nextOperation_ = std::move(nextOperation);
+  }
+
+  std::unique_ptr<IOperation> GetNextOperation() override {
+    return std::move(nextOperation_);
+  }
+
+ private:
+  std::string filename_;
+  std::unique_ptr<IOperation> nextOperation_ = nullptr;
+};
+
+class EchoOperation : public IOperation {
+ public:
+  explicit EchoOperation(std::string str) : str_(std::move(str)) {}
+
+  void ProcessLine(const std::string &str) override {
+  }
+
+  void HandleEndOfInput() override {
+    std::cout << str_ << std::endl;
+    if (nextOperation_ != nullptr) {
+      auto a = std::move(nextOperation_);
+      a->HandleEndOfInput();
+    }
+  }
+
+  void SetNextOperation(std::unique_ptr<IOperation> nextOperation) override {
+    nextOperation_ = std::move(nextOperation);
+  }
+
+  std::unique_ptr<IOperation> GetNextOperation() override {
+    return std::move(nextOperation_);
+  }
+
+ private:
+  std::string str_;
+  std::unique_ptr<IOperation> nextOperation_ = nullptr;
+
+};
+
+class ReplaceOperation : public IOperation {
+ public:
+  ReplaceOperation(std::string strA, std::string strB, std::string fileName)
+      : strA_(std::move(strA)), strB_(std::move(strB)), fileName_(std::move(fileName)) {}
+
+  void ProcessLine(std::string &line) {
+    size_t pos = 0;
+    while ((pos = line.find(strA_, pos)) != std::string::npos) {
+      line.replace(pos, strA_.length(), strB_);
+      pos += strB_.length();
+    }
+  }
+
+  void HandleEndOfInput() override {
+    std::ifstream fileIn(fileName_);
+    if (fileIn.is_open()) {
+      std::string line;
+      std::string output;
+      while (std::getline(fileIn, line)) {
+        ProcessLine(line);
+        output += line + "\n";
+      }
+      fileIn.close();
+      std::ofstream fileOut(fileName_);
+      if (fileOut.is_open()) {
+        fileOut << output;
+        fileOut.close();
+      }
+    }
+    if (nextOperation_ != nullptr) {
+      auto a = std::move(nextOperation_);
+      a->HandleEndOfInput();
+    }
+  }
+
+  void Execute() {}
+
+  void SetNextOperation(std::unique_ptr<IOperation> nextOperation) override {
+    nextOperation_ = std::move(nextOperation);
+  }
+
+  std::unique_ptr<IOperation> GetNextOperation() override {
+    return std::move(nextOperation_);
+  }
+
+ private:
+  std::string strA_;
+  std::string strB_;
+  std::string fileName_;
+  std::unique_ptr<IOperation> nextOperation_ = nullptr;
+};
+
+int main(int argc, char *argv[]) {
+  std::string expression;
+
+  for (int i = 1; i < argc; ++i) {
+    expression += argv[i];
+    if (i < argc - 1) {
+      expression += ' ';
+    }
+  }
+  std::vector<std::unique_ptr<IOperation>> operations;
+  size_t pos = 0;
+  while ((pos = expression.find('|')) != std::string::npos) {
+
+    std::string op = expression.substr(0, pos - 1);
+    expression.erase(0, pos + 2);
+
+    if (op.substr(0, 4) == "echo") {
+      std::string arg = op.substr(5);
+      operations.push_back(std::make_unique<EchoOperation>(arg));
+    }
+    else if (op.substr(0, 3) == "cat") {
+      std::string arg = op.substr(4);
+      operations.push_back(std::make_unique<CatOperation>(arg));
+    }
+    else if (op.substr(0, 7) == "replace") {
+      std::stringstream x;
+      x << op;
+      std::string word;
+      x >> word;
+      x >> word;
+      std::string str1 = word;
+      x >> word;
+      std::string str2 = word;
+      x >> word;
+      std::string file_name = word;
+      operations.push_back(std::make_unique<ReplaceOperation>(str1, str2, file_name));
+    }
+  }
+  if (!expression.empty()) {
+    if (expression.substr(0, 4) == "echo") {
+      std::string arg = expression.substr(5);
+      operations.push_back(std::make_unique<EchoOperation>(arg));
+    }
+    else if (expression.substr(0, 3) == "cat") {
+      std::string arg = expression.substr(4);
+      operations.push_back(std::make_unique<CatOperation>(arg));
+    }
+    else if (expression.substr(0, 7) == "replace") {
+      std::stringstream x;
+      x << expression;
+      std::string word;
+      x >> word;
+      x >> word;
+      std::string str1 = word;
+      x >> word;
+      std::string str2 = word;
+      x >> word;
+      std::string file_name = word;
+      operations.push_back(std::make_unique<ReplaceOperation>(str1, str2, file_name));
+    }
+  }
+  for (size_t i = operations.size() - 1; i > 0; i--) {
+    operations[i - 1]->SetNextOperation(std::move(operations[i]));
+  }
+  operations[0]->HandleEndOfInput();
+  return 0;
+}
+/*пример
+file_1.txt = "lol"
+Ввод
+./text_processor 'replace lol gogo file_1.txt | cat file_1.txt | replace gogo tot file_1.txt | cat file_1.txt | echo 1'
+Вывод:
+gogo
+tot
+1*/
+