[sensor] Use C++17 nested namespace syntax (#13116)

esphome/components/sensor/automation.cpp

@@ -1,10 +1,8 @@
 #include "automation.h"
 #include "esphome/core/log.h"
 
-namespace esphome {
-namespace sensor {
+namespace esphome::sensor {
 
 static const char *const TAG = "sensor.automation";
 
-}  // namespace sensor
-}  // namespace esphome
+}  // namespace esphome::sensor

esphome/components/sensor/automation.h

@@ -4,8 +4,7 @@
 #include "esphome/core/automation.h"
 #include "esphome/components/sensor/sensor.h"
 
-namespace esphome {
-namespace sensor {
+namespace esphome::sensor {
 
 class SensorStateTrigger : public Trigger<float> {
  public:
@@ -107,5 +106,4 @@ template<typename... Ts> class SensorInRangeCondition : public Condition<Ts...>
   float max_{NAN};
 };
 
-}  // namespace sensor
-}  // namespace esphome
+}  // namespace esphome::sensor

esphome/components/sensor/filter.cpp

@@ -5,8 +5,7 @@
 #include "esphome/core/log.h"
 #include "sensor.h"
 
-namespace esphome {
-namespace sensor {
+namespace esphome::sensor {
 
 static const char *const TAG = "sensor.filter";
 
@@ -574,5 +573,4 @@ void StreamingMovingAverageFilter::reset_batch() {
   this->valid_count_ = 0;
 }
 
-}  // namespace sensor
-}  // namespace esphome
+}  // namespace esphome::sensor

esphome/components/sensor/filter.h

@@ -7,8 +7,7 @@
 #include "esphome/core/component.h"
 #include "esphome/core/helpers.h"
 
-namespace esphome {
-namespace sensor {
+namespace esphome::sensor {
 
 class Sensor;
 
@@ -632,5 +631,4 @@ class StreamingMovingAverageFilter : public StreamingFilter {
   size_t valid_count_{0};
 };
 
-}  // namespace sensor
-}  // namespace esphome
+}  // namespace esphome::sensor

esphome/components/sensor/sensor.cpp

@@ -3,8 +3,7 @@
 #include "esphome/core/controller_registry.h"
 #include "esphome/core/log.h"
 
-namespace esphome {
-namespace sensor {
+namespace esphome::sensor {
 
 static const char *const TAG = "sensor";
 
@@ -135,5 +134,4 @@ void Sensor::internal_send_state_to_frontend(float state) {
 #endif
 }
 
-}  // namespace sensor
-}  // namespace esphome
+}  // namespace esphome::sensor

esphome/components/sensor/sensor.h

@@ -9,8 +9,7 @@
 #include <initializer_list>
 #include <memory>
 
-namespace esphome {
-namespace sensor {
+namespace esphome::sensor {
 
 void log_sensor(const char *tag, const char *prefix, const char *type, Sensor *obj);
 
@@ -143,5 +142,4 @@ class Sensor : public EntityBase, public EntityBase_DeviceClass, public EntityBa
   } sensor_flags_{};
 };
 
-}  // namespace sensor
-}  // namespace esphome
+}  // namespace esphome::sensor