feat(qmetaobject): add "is" wrappers for special QJSValues

qmetaobject/src/qtdeclarative.rs

@@ -926,13 +926,29 @@ cpp_class!(
  pub unsafe struct QJSValue as "QJSValue"
 );
 
+/// Wrapper for [`QJSValue::SpecialValue`][qt]
+///
+/// [qt]: https://doc.qt.io/qt-5/qjsvalue.html#SpecialValue-enum
+#[repr(u32)]
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub enum QJSValueSpecialValue {
+ NullValue = 0,
+ UndefinedValue = 1,
+}
+
 impl QJSValue {
  pub fn is_bool(&self) -> bool {
  cpp!(unsafe [self as "const QJSValue *"] -> bool as "bool" {
  return self->isBool();
  })
  }
 
+ pub fn is_null(&self) -> bool {
+ cpp!(unsafe [self as "const QJSValue *"] -> bool as "bool" {
+ return self->isNull();
+ })
+ }
+
  pub fn is_number(&self) -> bool {
  cpp!(unsafe [self as "const QJSValue *"] -> bool as "bool" {
  return self->isNumber();
@@ -945,6 +961,12 @@ impl QJSValue {
  })
  }
 
+ pub fn is_undefined(&self) -> bool {
+ cpp!(unsafe [self as "const QJSValue *"] -> bool as "bool" {
+ return self->isUndefined();
+ })
+ }
+
  pub fn to_string(&self) -> QString {
  cpp!(unsafe [self as "const QJSValue *"] -> QString as "QString" {
  return self->toString();
@@ -1026,6 +1048,14 @@ impl From<bool> for QJSValue {
  }
 }
 
+impl From<QJSValueSpecialValue> for QJSValue {
+ fn from(a: QJSValueSpecialValue) -> QJSValue {
+ cpp!(unsafe [a as "QJSValue::SpecialValue"] -> QJSValue as "QJSValue" {
+ return QJSValue(a);
+ })
+ }
+}
+
 impl QMetaType for QJSValue {
  fn register(_name: Option<&CStr>) -> i32 {
  cpp!(unsafe [] -> i32 as "int" { return qMetaTypeId<QJSValue>(); })
@@ -1053,6 +1083,15 @@ mod qjsvalue_tests {
  assert!(!num_value.is_bool());
  }
 
+ #[test]
+ fn test_is_null() {
+ let null_value = QJSValue::from(QJSValueSpecialValue::NullValue);
+ let num_value = QJSValue::from(42);
+
+ assert!(null_value.is_null());
+ assert!(!num_value.is_null());
+ }
+
  #[test]
  fn test_is_number() {
  let string_value = QJSValue::from(QString::from("Konqui"));
@@ -1071,6 +1110,15 @@ mod qjsvalue_tests {
  assert!(!num_value.is_string());
  }
 
+ #[test]
+ fn test_is_undefined() {
+ let undefined_value = QJSValue::from(QJSValueSpecialValue::UndefinedValue);
+ let num_value = QJSValue::from(42);
+
+ assert!(undefined_value.is_undefined());
+ assert!(!num_value.is_undefined());
+ }
+
  #[test]
  fn test_qvariantlist_from_iter() {
  let v = vec![1u32, 2u32, 3u32];