From ea80856073d4896da5df78d60369b327346a0b56 Mon Sep 17 00:00:00 2001
From: Yuqian Yang <crupest@crupest.life>
Date: Sat, 11 Oct 2025 19:30:36 +0800
Subject: Split and log debug tag.

---
 include/cru/base/StringUtil.h | 47 +++++++++++++++++++++++++++++++++++++++++++
 include/cru/base/log/Logger.h |  8 ++++++++
 2 files changed, 55 insertions(+)

(limited to 'include/cru')

diff --git a/include/cru/base/StringUtil.h b/include/cru/base/StringUtil.h
index 8f085283..ef6359ff 100644
--- a/include/cru/base/StringUtil.h
+++ b/include/cru/base/StringUtil.h
@@ -1,10 +1,57 @@
 #pragma once
 #include "Base.h"
+#include "Bitmask.h"
 
 #include <functional>
+#include <stdexcept>
 #include <type_traits>
+#include <vector>
 
 namespace cru {
+namespace details {
+struct SplitOptionsTag {};
+}  // namespace details
+using SplitOption = Bitmask<details::SplitOptionsTag>;
+struct SplitOptions {
+  static constexpr SplitOption RemoveEmpty = SplitOption::FromOffset(1);
+};
+
+template <typename TString>
+std::vector<TString> Split(const TString& str, const TString& sep,
+                           SplitOption options = {}) {
+  using size_type = typename TString::size_type;
+
+  if (sep.empty()) throw std::invalid_argument("Sep can't be empty.");
+  if (str.empty()) return {};
+
+  size_type current_pos = 0;
+  std::vector<TString> result;
+
+  while (current_pos != TString::npos) {
+    if (current_pos == str.size()) {
+      if (!options.Has(SplitOptions::RemoveEmpty)) {
+        result.push_back({});
+      }
+      break;
+    }
+
+    auto next_pos = str.find(sep, current_pos);
+    auto sub = str.substr(current_pos, next_pos - current_pos);
+    if (!(options.Has(SplitOptions::RemoveEmpty) && sub.empty())) {
+      result.push_back(sub);
+    }
+    current_pos =
+        next_pos == TString::npos ? TString::npos : next_pos + sep.size();
+  }
+
+  return result;
+}
+
+inline std::vector<std::string> Split(const char* str, const std::string& sep,
+                                      SplitOption options = {}) {
+  return Split<std::string>(std::string(str), sep, options);
+}
+
 using CodePoint = std::int32_t;
 constexpr CodePoint k_invalid_code_point = -1;
 
diff --git a/include/cru/base/log/Logger.h b/include/cru/base/log/Logger.h
index 1ef53654..f44bad72 100644
--- a/include/cru/base/log/Logger.h
+++ b/include/cru/base/log/Logger.h
@@ -6,7 +6,9 @@
 #include <list>
 #include <memory>
 #include <mutex>
+#include <string_view>
 #include <thread>
+#include <unordered_set>
 #include <utility>
 #include <vector>
 
@@ -40,6 +42,11 @@ class CRU_BASE_API Logger : public Object2 {
   void AddLogTarget(std::unique_ptr<ILogTarget> source);
   void RemoveLogTarget(ILogTarget* source);
 
+  void AddDebugTag(std::string tag);
+  void RemoveDebugTag(const std::string& tag);
+  void LoadDebugTagFromEnv(const char* env_var = "CRU_LOG_DEBUG",
+                           std::string sep = ",");
+
  public:
   void Log(LogLevel level, std::string tag, std::string message) {
     Log(LogInfo(level, std::move(tag), std::move(message)));
@@ -59,6 +66,7 @@ class CRU_BASE_API Logger : public Object2 {
 
  private:
   std::mutex log_queue_mutex_;
+  std::unordered_set<std::string> debug_tags_;
   std::condition_variable log_queue_condition_variable_;
   std::list<LogInfo> log_queue_;
   bool log_stop_;
-- 
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