Memory-managed wrapper type.

Type class for types which can be safely cast to Value, for instance with toValue.

Cast to Value, for types for which this is known to be safe. For general casts, use castTo.

Gets a pointer to memory that contains the array buffer data.

Obtains a pointer to the memory region that holds the contents of the ArrayBuffer; modifications done to the data will be visible to JavaScript code. If size is not Nothing, the size in bytes of the memory region will also be stored in the pointed location.

Note that the pointer returned by this function is not guaranteed to remain the same after calls to other JSC API functions. If you plan to access the data of the ArrayBuffer later, you can keep a reference to the value and obtain the data pointer at a later point. Keep in mind that if JavaScript code has a chance to run, for example due to main loop events that result in JSC being called, the contents of the memory region might be modified in the meantime. Consider taking a copy of the data and using the copy instead in asynchronous code.

Since: 2.38

Gets the size in bytes of the array buffer.

Obtains the size in bytes of the memory region that holds the contents of an ArrayBuffer.

Since: 2.38

Invoke <function>new</function> with constructor referenced by value. If nParameters is 0 no parameters will be passed to the constructor.

Call function referenced by value, passing the given parameters. If nParameters is 0 no parameters will be passed to the function.

This function always returns a Value, in case of void functions a Value referencing <function>undefined</function> is returned

Get the Context in which value was created.

Get whether the value referenced by value is an array.

Check whether the value is an ArrayBuffer.

Since: 2.38

Get whether the value referenced by value is a boolean.

Get whether the value referenced by value is a constructor.

Get whether the value referenced by value is a function

Get whether the value referenced by value is <function>null</function>.

Get whether the value referenced by value is a number.

Get whether the value referenced by value is an object.

Get whether the value referenced by value is a string

Determines whether a value is a typed array.

Since: 2.38

Get whether the value referenced by value is <function>undefined</function>.

Creates a new ArrayBuffer from existing data in memory.

The data is not copied: while this allows sharing data with JavaScript efficiently, the caller must ensure that the memory region remains valid until the newly created object is released by JSC.

Optionally, a destroyNotify callback can be provided, which will be invoked with userData as parameter when the ArrayBuffer object is released. This is intended to be used for freeing resources related to the memory region which contains the data:

!<-- language="C" -->
GMappedFile *f = g_mapped_file_new (file_path, TRUE, NULL);
JSCValue *value = jsc_value_new_array_buffer (context,
    g_mapped_file_get_contents (f), g_mapped_file_get_length (f),
    (GDestroyNotify) g_mapped_file_unref, f);

Note that the userData can be the same value as data:

!<-- language="C" -->
void *bytes = g_malloc0 (100);
JSCValue *value = jsc_value_new_array_buffer (context, bytes, 100, g_free, bytes);

Since: 2.38

Create a new Value referencing an array with the items from array. If array is Nothing or empty a new empty array will be created. Elements of array should be pointers to a Value.

Create a new Value referencing an array of strings with the items from strv. If array is Nothing or empty a new empty array will be created.

Create a new Value from value

Create a new Value referencing a new value created by parsing json.

Since: 2.28

Create a function in context. If name is Nothing an anonymous function will be created. When the function is called by JavaScript or jsc_value_function_call(), callback is called receiving the function parameters and then userData as last parameter. When the function is cleared in context, destroyNotify is called with userData as parameter.

Note that the value returned by callback must be fully transferred. In case of boxed types, you could use G_TYPE_POINTER instead of the actual boxed GType to ensure that the instance owned by Class is used. If you really want to return a new copy of the boxed type, use JSC_TYPE_VALUE and return a Value created with valueNewObject that receives the copy as instance parameter.

Create a function in context. If name is Nothing an anonymous function will be created. When the function is called by JavaScript or jsc_value_function_call(), callback is called receiving an PtrArray of Values with the arguments and then userData as last parameter. When the function is cleared in context, destroyNotify is called with userData as parameter.

Note that the value returned by callback must be fully transferred. In case of boxed types, you could use G_TYPE_POINTER instead of the actual boxed GType to ensure that the instance owned by Class is used. If you really want to return a new copy of the boxed type, use JSC_TYPE_VALUE and return a Value created with valueNewObject that receives the copy as instance parameter.

Create a new Value referencing <function>null</function> in context.

Create a new Value from number.

Create a new Value from instance. If instance is Nothing a new empty object is created. When instance is provided, jscClass must be provided too. jscClass takes ownership of instance that will be freed by the DestroyNotify passed to contextRegisterClass.

Create a new Value from string. If you need to create a Value from a string containing null characters, use valueNewStringFromBytes instead.

Create a new Value from bytes.

Create a new typed array containing a given amount of elements.

Create a Value referencing a new typed array with space for length elements of a given type. As all typed arrays must have an associated ArrayBuffer, a new one of suitable size will be allocated to store the elements, which will be initialized to zero.

The type must *not* be TypedArrayTypeNone.

Since: 2.38

Create a new typed array value with elements from an array buffer.

Create a Value referencing a new typed array value containing elements of the given type, where the elements are stored at the memory region represented by the arrayBuffer.

The type must *not* be TypedArrayTypeNone.

The offset and length parameters can be used to indicate which part of the array buffer can be accessed through the typed array. If both are omitted (passing zero as offset, and -1 as length), the whole arrayBuffer is exposed through the typed array. Omitting the length with a non-zero offset will expose the remainder of the arrayBuffer starting at the indicated offset.

Since: 2.38

Create a new Value referencing <function>undefined</function> in context.

Define or modify a property with propertyName in object referenced by value. When the property value needs to be getted or set, getter and setter callbacks will be called. When the property is cleared in the Class context, destroyNotify is called with userData as parameter. This is equivalent to JavaScript <function>Object.defineProperty()</function> when used with an accessor descriptor.

Note that the value returned by getter must be fully transferred. In case of boxed types, you could use G_TYPE_POINTER instead of the actual boxed GType to ensure that the instance owned by Class is used. If you really want to return a new copy of the boxed type, use JSC_TYPE_VALUE and return a Value created with valueNewObject that receives the copy as instance parameter.

Note that getter and setter are called as functions and not methods, so they don't receive an instance as first parameter. Use classAddProperty if you want to add property accessor invoked as a method.

Define or modify a property with propertyName in object referenced by value. This is equivalent to JavaScript <function>Object.defineProperty()</function> when used with a data descriptor.

Try to delete property with name from value. This function will return False if the property was defined without ValuePropertyFlagsConfigurable flag.

Get the list of property names of value. Only properties defined with ValuePropertyFlagsEnumerable flag will be collected.

Get property with name from value.

Get property at index from value.

Get whether value has property with name.

Invoke method with name on object referenced by value, passing the given parameters. If nParameters is 0 no parameters will be passed to the method. The object instance will be handled automatically even when the method is a custom one registered with jsc_class_add_method(), so it should never be passed explicitly as parameter of this function.

This function always returns a Value, in case of void methods a Value referencing <function>undefined</function> is returned.

Get whether the value referenced by value is an instance of class name.

Set property with name on value.

Set property at index on value.

Convert value to a boolean.

Convert value to a double.

Convert value to a gint32.

Create a JSON string of value serialization. If indent is 0, the resulting JSON will not contain newlines. The size of the indent is clamped to 10 spaces.

Since: 2.28

Convert value to a string. Use valueToStringAsBytes instead, if you need to handle strings containing null characters.

Convert value to a string and return the results as Bytes. This is needed to handle strings with null characters.

Obtain the ArrayBuffer for the memory region of the typed array elements.

Since: 2.38

Obtains a pointer to the memory region that holds the elements of the typed array; modifications done to them will be visible to JavaScript code. If length is not Nothing, the number of elements contained in the typed array are also stored in the pointed location.

The returned pointer needs to be casted to the appropriate type (see TypedArrayType), and has the offset over the underlying array buffer data applied—that is, points to the first element of the typed array:

C code

if (jsc_value_typed_array_get_type(value) != JSC_TYPED_ARRAY_UINT32)
    g_error ("Only arrays of uint32_t are supported");

gsize count = 0;
uint32_t *elements = jsc_value_typed_array_get_contents (value, &count);
for (gsize i = 0; i < count; i++)
     g_print ("index %zu, value %" PRIu32 "\n", i, elements[i]);

Note that the pointer returned by this function is not guaranteed to remain the same after calls to other JSC API functions. See valueArrayBufferGetData for details.

Since: 2.38

Gets the number of elements in a typed array.

Since: 2.38

Gets the offset over the underlying array buffer data.

Since: 2.38

Gets the size of a typed array.

Since: 2.38

Gets the type of elements contained in a typed array.

Since: 2.38

Construct a GValueConstruct with valid value for the “context” property. This is rarely needed directly, but it is used by new.

Get the value of the “context” property. When overloading is enabled, this is equivalent to

get value #context