Add Number entities (from Home Assistant) (#1971)

Co-authored-by: Oxan van Leeuwen <oxan@oxanvanleeuwen.nl>

esphome/components/number/number.cpp

@@ -0,0 +1,76 @@
+#include "number.h"
+#include "esphome/core/log.h"
+
+namespace esphome {
+namespace number {
+
+static const char *const TAG = "number";
+
+void NumberCall::perform() {
+  ESP_LOGD(TAG, "'%s' - Setting", this->parent_->get_name().c_str());
+  if (this->value_.has_value()) {
+    auto value = *this->value_;
+    uint8_t accuracy = this->parent_->get_accuracy_decimals();
+    float min_value = this->parent_->get_min_value();
+    if (value < min_value) {
+      ESP_LOGW(TAG, "  Value %s must not be less than minimum %s", value_accuracy_to_string(value, accuracy).c_str(),
+               value_accuracy_to_string(min_value, accuracy).c_str());
+      this->value_.reset();
+      return;
+    }
+    float max_value = this->parent_->get_max_value();
+    if (value > max_value) {
+      ESP_LOGW(TAG, "  Value %s must not be larger than maximum %s", value_accuracy_to_string(value, accuracy).c_str(),
+               value_accuracy_to_string(max_value, accuracy).c_str());
+      this->value_.reset();
+      return;
+    }
+    ESP_LOGD(TAG, "  Value: %s", value_accuracy_to_string(*this->value_, accuracy).c_str());
+    this->parent_->set(*this->value_);
+  }
+}
+
+NumberCall &NumberCall::set_value(float value) {
+  this->value_ = value;
+  return *this;
+}
+
+const optional<float> &NumberCall::get_value() const { return this->value_; }
+
+NumberCall Number::make_call() { return NumberCall(this); }
+
+void Number::publish_state(float state) {
+  this->has_state_ = true;
+  this->state = state;
+  ESP_LOGD(TAG, "'%s': Sending state %.5f", this->get_name().c_str(), state);
+  this->state_callback_.call(state);
+}
+
+uint32_t Number::update_interval() { return 0; }
+Number::Number(const std::string &name) : Nameable(name), state(NAN) {}
+Number::Number() : Number("") {}
+
+void Number::add_on_state_callback(std::function<void(float)> &&callback) {
+  this->state_callback_.add(std::move(callback));
+}
+void Number::set_icon(const std::string &icon) { this->icon_ = icon; }
+std::string Number::get_icon() { return *this->icon_; }
+int8_t Number::get_accuracy_decimals() {
+  // use printf %g to find number of digits based on step
+  char buf[32];
+  sprintf(buf, "%.5g", this->step_);
+  std::string str{buf};
+  size_t dot_pos = str.find('.');
+  if (dot_pos == std::string::npos)
+    return 0;
+
+  return str.length() - dot_pos - 1;
+}
+float Number::get_state() const { return this->state; }
+
+bool Number::has_state() const { return this->has_state_; }
+
+uint32_t Number::hash_base() { return 2282307003UL; }
+
+}  // namespace number
+}  // namespace esphome