diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..8987ab7
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,68 @@
+cmake_minimum_required(VERSION 3.12 FATAL_ERROR)
+
+include(FetchContent)
+
+project(password-analyzer CXX)
+
+set(CMAKE_CXX_STANDARD 23)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fmacro-prefix-map=${CMAKE_SOURCE_DIR}=.")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fuse-ld=mold -Wno-unused-command-line-argument")
+set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS} -fsanitize=address,undefined")
+
+message(STATUS "[DEPS] Processing spdlog")
+FetchContent_Declare(
+        spdlog
+        GIT_REPOSITORY https://github.com/gabime/spdlog
+        GIT_TAG v1.12.0
+        GIT_SHALLOW TRUE
+        GIT_PROGRESS TRUE
+        OVERRIDE_FIND_PACKAGE
+)
+FetchContent_MakeAvailable(spdlog)
+
+message(STATUS "[DEPS] Processing Catch2")
+find_package(Catch2 3 CONFIG)
+if (NOT Catch2_FOUND)
+    FetchContent_Declare(
+            Catch2
+            GIT_REPOSITORY https://github.com/catchorg/Catch2.git
+            GIT_TAG v3.4.0
+            GIT_SHALLOW TRUE
+            GIT_PROGRESS TRUE
+            OVERRIDE_FIND_PACKAGE
+    )
+    FetchContent_MakeAvailable(Catch2)
+    list(APPEND CMAKE_MODULE_PATH ${catch2_SOURCE_DIR}/extras)
+endif ()
+
+message(STATUS "[DEPS] Processing MagicEnum")
+FetchContent_Declare(
+        magic_enum
+        GIT_REPOSITORY https://github.com/Neargye/magic_enum
+        GIT_TAG v0.9.3
+        GIT_SHALLOW TRUE
+        GIT_PROGRESS TRUE
+        OVERRIDE_FIND_PACKAGE
+)
+FetchContent_MakeAvailable(magic_enum)
+
+message(STATUS "[DEPS] Processing generator")
+file(DOWNLOAD
+        "https://raw.githubusercontent.com/lewissbaker/generator/master/include/__generator.hpp"
+        "${CMAKE_BINARY_DIR}/external/generator.hpp")
+include_directories(password-analyzer PRIVATE ${CMAKE_BINARY_DIR}/external)
+
+set(COMMON_SOURCES
+        defs.hpp
+        utils.cpp
+)
+set(COMMON_LIBRARIES
+        magic_enum::magic_enum
+        spdlog::spdlog
+)
+
+add_executable(password-analyzer ${COMMON_SOURCES} analyzer.cpp)
+target_link_libraries(password-analyzer PRIVATE ${COMMON_LIBRARIES})
diff --git a/defs.hpp b/defs.hpp
new file mode 100644
index 0000000..b8250d7
--- /dev/null
+++ b/defs.hpp
@@ -0,0 +1,24 @@
+#ifndef DEFS_HPP
+#define DEFS_HPP
+
+#include <string>
+#if __has_include(<generator>)
+    #include <generator>
+#else
+    #include "generator.hpp"
+#endif
+
+#include "spdlog/spdlog.h"
+#include "magic_enum.hpp"
+
+using std::operator""s;
+using std::operator""sv;
+
+enum class DataSource { CSDN, YAHOO };
+
+bool is_num(char c);
+bool is_alpha(char c);
+
+std::generator<std::string> passwords(const DataSource &source);
+
+#endif // DEFS_HPP
diff --git a/utils.cpp b/utils.cpp
new file mode 100644
index 0000000..119e82b
--- /dev/null
+++ b/utils.cpp
@@ -0,0 +1,76 @@
+#include <cctype>
+#include <fstream>
+#include <ranges>
+#include <string>
+#include <utility>
+
+#include "defs.hpp"
+
+bool is_num(char c) { return c >= '0' && c <= '9'; }
+bool is_alpha(char c) { return std::isalpha(c); }
+
+static std::vector<std::string> data_buf[2];
+enum class BufStatus { INIT, FILLING, DONE };
+static BufStatus data_buf_ok[2] = {BufStatus::INIT, BufStatus::INIT};
+
+std::generator<std::string> passwords(const DataSource &source) {
+    if (data_buf_ok[magic_enum::enum_integer(source)] == BufStatus::DONE) {
+        for (auto const &password : data_buf[magic_enum::enum_integer(source)]) {
+            co_yield password;
+        }
+        co_return;
+    }
+
+    if (data_buf_ok[magic_enum::enum_integer(source)] == BufStatus::INIT)
+        data_buf_ok[magic_enum::enum_integer(source)] = BufStatus::FILLING;
+
+    auto          filename = "data/"s + (source == DataSource::CSDN ? "www.csdn.net.sql"s : "plaintxt_yahoo.txt"s);
+    std::ifstream is(filename);
+
+    if (!is.is_open()) {
+        spdlog::error("failed to open {}", filename);
+        co_return;
+    }
+
+    switch (source) {
+        case DataSource::CSDN: {
+            constexpr auto delim{" # "sv};
+            std::string    line;
+            while (std::getline(is, line)) {
+                auto segments = line | std::views::split(delim);
+                auto second   = *std::ranges::next(segments.begin(), 1);
+                auto password = std::string(second.begin(), second.end());
+
+                if (data_buf_ok[magic_enum::enum_integer(source)] == BufStatus::FILLING)
+                    data_buf[magic_enum::enum_integer(source)].push_back(password);
+
+                co_yield password;
+            }
+        } break;
+        case DataSource::YAHOO: {
+            constexpr auto delim{":"sv};
+            std::string    line;
+            while (std::getline(is, line)) {
+                std::erase(line, '\r');
+                if (line.empty() || !is_num(line[0])) continue;
+                if (is_num(line[0]) && line[1] == '.') continue;
+
+                auto segments = line | std::views::split(delim);
+                auto third    = *std::ranges::next(segments.begin(), 2);
+                auto password = std::string(third.begin(), third.end());
+
+                if (password.empty()) continue;
+                if (data_buf_ok[magic_enum::enum_integer(source)] == BufStatus::FILLING)
+                    data_buf[magic_enum::enum_integer(source)].push_back(password);
+
+                co_yield password;
+            }
+        } break;
+        default: std::unreachable();
+    }
+
+    data_buf_ok[magic_enum::enum_integer(source)] = BufStatus::DONE;
+
+    is.close();
+    co_return;
+}
\ No newline at end of file