From 64269334ce9e1c5ae70268f679c550c7d62686de Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@koston.org>
Date: Sat, 20 Dec 2025 06:46:13 -1000
Subject: [PATCH] [text_sensor] Avoid string copies in callbacks by passing
 const ref (#12503)

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Jonathan Swoboda <154711427+swoboda1337@users.noreply.github.com>
---
 esphome/components/text_sensor/text_sensor.cpp | 4 ++--
 esphome/components/text_sensor/text_sensor.h   | 8 ++++----
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/esphome/components/text_sensor/text_sensor.cpp b/esphome/components/text_sensor/text_sensor.cpp
index 76c1acf56..ad1dc0f52 100644
--- a/esphome/components/text_sensor/text_sensor.cpp
+++ b/esphome/components/text_sensor/text_sensor.cpp
@@ -71,10 +71,10 @@ void TextSensor::clear_filters() {
   this->filter_list_ = nullptr;
 }
 
-void TextSensor::add_on_state_callback(std::function<void(std::string)> callback) {
+void TextSensor::add_on_state_callback(std::function<void(const std::string &)> callback) {
   this->callback_.add(std::move(callback));
 }
-void TextSensor::add_on_raw_state_callback(std::function<void(std::string)> callback) {
+void TextSensor::add_on_raw_state_callback(std::function<void(const std::string &)> callback) {
   this->raw_callback_.add(std::move(callback));
 }
 
diff --git a/esphome/components/text_sensor/text_sensor.h b/esphome/components/text_sensor/text_sensor.h
index f926f171a..919bf81c8 100644
--- a/esphome/components/text_sensor/text_sensor.h
+++ b/esphome/components/text_sensor/text_sensor.h
@@ -55,9 +55,9 @@ class TextSensor : public EntityBase, public EntityBase_DeviceClass {
   /// Clear the entire filter chain.
   void clear_filters();
 
-  void add_on_state_callback(std::function<void(std::string)> callback);
+  void add_on_state_callback(std::function<void(const std::string &)> callback);
   /// Add a callback that will be called every time the sensor sends a raw value.
-  void add_on_raw_state_callback(std::function<void(std::string)> callback);
+  void add_on_raw_state_callback(std::function<void(const std::string &)> callback);
 
   // ========== INTERNAL METHODS ==========
   // (In most use cases you won't need these)
@@ -65,8 +65,8 @@ class TextSensor : public EntityBase, public EntityBase_DeviceClass {
   void internal_send_state_to_frontend(const std::string &state);
 
  protected:
-  LazyCallbackManager<void(std::string)> raw_callback_;  ///< Storage for raw state callbacks.
-  LazyCallbackManager<void(std::string)> callback_;      ///< Storage for filtered state callbacks.
+  LazyCallbackManager<void(const std::string &)> raw_callback_;  ///< Storage for raw state callbacks.
+  LazyCallbackManager<void(const std::string &)> callback_;      ///< Storage for filtered state callbacks.
 
   Filter *filter_list_{nullptr};  ///< Store all active filters.
 };