700 lines
22 KiB
Rust
700 lines
22 KiB
Rust
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use crate::avm1::function::{Executable, NativeFunction};
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use crate::avm1::property::{Attribute, Property};
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use crate::avm1::return_value::ReturnValue;
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use crate::avm1::{Avm1, Error, Object, ObjectCell, UpdateContext, Value};
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use crate::display_object::DisplayNode;
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use core::fmt;
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use enumset::EnumSet;
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use gc_arena::{GcCell, MutationContext};
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use std::collections::hash_map::Entry;
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use std::collections::HashMap;
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pub const TYPE_OF_OBJECT: &str = "object";
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pub const TYPE_OF_FUNCTION: &str = "function";
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pub const TYPE_OF_MOVIE_CLIP: &str = "movieclip";
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#[derive(Clone)]
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pub struct ScriptObject<'gc> {
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prototype: Option<ObjectCell<'gc>>,
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display_node: Option<DisplayNode<'gc>>,
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values: HashMap<String, Property<'gc>>,
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function: Option<Executable<'gc>>,
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type_of: &'static str,
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}
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unsafe impl<'gc> gc_arena::Collect for ScriptObject<'gc> {
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fn trace(&self, cc: gc_arena::CollectionContext) {
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self.prototype.trace(cc);
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self.display_node.trace(cc);
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self.values.trace(cc);
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}
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}
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impl fmt::Debug for ScriptObject<'_> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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f.debug_struct("Object")
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.field("prototype", &self.prototype)
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.field("display_node", &self.display_node)
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.field("values", &self.values)
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.field("function", &self.function.is_some())
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.finish()
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}
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}
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impl<'gc> ScriptObject<'gc> {
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pub fn object(
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_gc_context: MutationContext<'gc, '_>,
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proto: Option<ObjectCell<'gc>>,
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) -> ScriptObject<'gc> {
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ScriptObject {
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prototype: proto,
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type_of: TYPE_OF_OBJECT,
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display_node: None,
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values: HashMap::new(),
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function: None,
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}
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}
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/// Constructs and allocates an empty but normal object in one go.
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pub fn object_cell(
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gc_context: MutationContext<'gc, '_>,
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proto: Option<ObjectCell<'gc>>,
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) -> ObjectCell<'gc> {
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GcCell::allocate(
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gc_context,
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Box::new(ScriptObject {
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prototype: proto,
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type_of: TYPE_OF_OBJECT,
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display_node: None,
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values: HashMap::new(),
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function: None,
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}),
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)
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}
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/// Constructs an object with no values, not even builtins.
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///
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/// Intended for constructing scope chains, since they exclusively use the
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/// object values, but can't just have a hashmap because of `with` and
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/// friends.
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pub fn bare_object() -> Self {
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ScriptObject {
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prototype: None,
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type_of: TYPE_OF_OBJECT,
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display_node: None,
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values: HashMap::new(),
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function: None,
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}
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}
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/// Construct a function sans prototype.
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pub fn bare_function(
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function: impl Into<Executable<'gc>>,
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fn_proto: Option<ObjectCell<'gc>>,
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) -> Self {
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ScriptObject {
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prototype: fn_proto,
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type_of: TYPE_OF_FUNCTION,
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function: Some(function.into()),
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display_node: None,
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values: HashMap::new(),
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}
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}
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/// Construct a function from an executable and associated protos.
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///
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/// Since prototypes need to link back to themselves, this function builds
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/// both objects itself and returns the function to you, fully allocated.
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///
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/// `fn_proto` refers to the implicit proto of the function object, and the
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/// `prototype` refers to the explicit prototype of the function. If
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/// provided, the function and it's prototype will be linked to each other.
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pub fn function(
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gc_context: MutationContext<'gc, '_>,
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function: impl Into<Executable<'gc>>,
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fn_proto: Option<ObjectCell<'gc>>,
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prototype: Option<ObjectCell<'gc>>,
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) -> ObjectCell<'gc> {
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let function = GcCell::allocate(
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gc_context,
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Box::new(Self::bare_function(function, fn_proto)) as Box<dyn Object<'gc> + 'gc>,
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);
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//TODO: Can we make these proper sets or no?
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if let Some(p) = prototype {
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p.write(gc_context)
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.as_script_object_mut()
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.unwrap()
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.force_set("constructor", Value::Object(function), EnumSet::empty());
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function
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.write(gc_context)
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.as_script_object_mut()
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.unwrap()
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.force_set("prototype", p, EnumSet::empty());
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}
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function
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}
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pub fn set_display_node(&mut self, display_node: DisplayNode<'gc>) {
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self.display_node = Some(display_node);
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}
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pub fn display_node(&self) -> Option<DisplayNode<'gc>> {
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self.display_node
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}
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pub fn force_set_virtual<A>(
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&mut self,
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name: &str,
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get: Executable<'gc>,
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set: Option<Executable<'gc>>,
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attributes: A,
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) where
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A: Into<EnumSet<Attribute>>,
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{
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self.values.insert(
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name.to_owned(),
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Property::Virtual {
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get,
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set,
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attributes: attributes.into(),
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},
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);
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}
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pub fn force_set<A>(&mut self, name: &str, value: impl Into<Value<'gc>>, attributes: A)
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where
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A: Into<EnumSet<Attribute>>,
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{
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self.values.insert(
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name.to_string(),
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Property::Stored {
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value: value.into(),
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attributes: attributes.into(),
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},
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);
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}
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/// Declare a native function on the current object.
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///
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/// This is intended for use with defining host object prototypes. Notably,
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/// this creates a function object without an explicit `prototype`, which
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/// is only possible when defining host functions. User-defined functions
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/// always get a fresh explicit prototype, so you should never force set a
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/// user-defined function.
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pub fn force_set_function<A>(
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&mut self,
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name: &str,
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function: NativeFunction<'gc>,
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gc_context: MutationContext<'gc, '_>,
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attributes: A,
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fn_proto: Option<ObjectCell<'gc>>,
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) where
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A: Into<EnumSet<Attribute>>,
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{
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self.force_set(
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name,
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Value::Object(ScriptObject::function(gc_context, function, fn_proto, None)),
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attributes,
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)
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}
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pub fn set_prototype(&mut self, prototype: ObjectCell<'gc>) {
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self.prototype = Some(prototype);
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}
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pub fn prototype(&self) -> Option<&ObjectCell<'gc>> {
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self.prototype.as_ref()
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}
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pub fn set_type_of(&mut self, type_of: &'static str) {
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self.type_of = type_of;
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}
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}
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impl<'gc> Object<'gc> for ScriptObject<'gc> {
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/// Get the value of a particular property on this object.
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///
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/// The `avm`, `context`, and `this` parameters exist so that this object
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/// can call virtual properties. Furthermore, since some virtual properties
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/// may resolve on the AVM stack, this function may return `None` instead
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/// of a `Value`. *This is not equivalent to `undefined`.* Instead, it is a
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/// signal that your value will be returned on the ActionScript stack, and
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/// that you should register a stack continuation in order to get it.
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fn get(
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&self,
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name: &str,
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avm: &mut Avm1<'gc>,
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context: &mut UpdateContext<'_, 'gc, '_>,
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this: ObjectCell<'gc>,
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) -> Result<ReturnValue<'gc>, Error> {
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if name == "__proto__" {
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return Ok(self
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.prototype
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.map_or(Value::Undefined, Value::Object)
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.into());
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}
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if let Some(value) = self.values.get(name) {
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return value.get(avm, context, this);
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}
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self.prototype
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.as_ref()
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.map_or(Ok(Value::Undefined.into()), |p| {
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p.read().get(name, avm, context, this)
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})
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}
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/// Set a named property on the object.
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///
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/// This function takes a redundant `this` parameter which should be
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/// the object's own `GcCell`, so that it can pass it to user-defined
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/// overrides that may need to interact with the underlying object.
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fn set(
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&mut self,
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name: &str,
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value: Value<'gc>,
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avm: &mut Avm1<'gc>,
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context: &mut UpdateContext<'_, 'gc, '_>,
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this: ObjectCell<'gc>,
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) -> Result<(), Error> {
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if name == "__proto__" {
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self.prototype = value.as_object().ok().to_owned();
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} else {
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match self.values.entry(name.to_owned()) {
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Entry::Occupied(mut entry) => {
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entry.get_mut().set(avm, context, this, value)?;
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}
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Entry::Vacant(entry) => {
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entry.insert(Property::Stored {
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value,
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attributes: Default::default(),
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});
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}
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}
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}
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Ok(())
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}
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/// Call the underlying object.
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///
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/// This function takes a redundant `this` parameter which should be
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/// the object's own `GcCell`, so that it can pass it to user-defined
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/// overrides that may need to interact with the underlying object.
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fn call(
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&self,
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avm: &mut Avm1<'gc>,
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context: &mut UpdateContext<'_, 'gc, '_>,
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this: ObjectCell<'gc>,
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args: &[Value<'gc>],
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) -> Result<ReturnValue<'gc>, Error> {
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if let Some(function) = &self.function {
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function.exec(avm, context, this, args)
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} else {
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Ok(Value::Undefined.into())
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}
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}
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/// Delete a named property from the object.
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///
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/// Returns false if the property cannot be deleted.
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fn delete(&mut self, name: &str) -> bool {
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if let Some(prop) = self.values.get(name) {
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if prop.can_delete() {
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self.values.remove(name);
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return true;
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}
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}
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false
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}
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/// Checks if the object has a given named property.
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fn has_property(&self, name: &str) -> bool {
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self.has_own_property(name)
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|| self
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.prototype
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.as_ref()
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.map_or(false, |p| p.read().has_property(name))
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}
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/// Checks if the object has a given named property on itself (and not,
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/// say, the object's prototype or superclass)
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fn has_own_property(&self, name: &str) -> bool {
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if name == "__proto__" {
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return true;
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}
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self.values.contains_key(name)
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}
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fn is_property_overwritable(&self, name: &str) -> bool {
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self.values
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.get(name)
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.map(|p| p.is_overwritable())
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.unwrap_or(false)
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}
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/// Checks if a named property appears when enumerating the object.
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fn is_property_enumerable(&self, name: &str) -> bool {
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if let Some(prop) = self.values.get(name) {
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prop.is_enumerable()
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} else {
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false
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}
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}
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/// Enumerate the object.
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fn get_keys(&self) -> Vec<String> {
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self.values
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.iter()
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.filter_map(|(k, p)| {
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if p.is_enumerable() {
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Some(k.to_string())
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} else {
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None
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}
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})
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.collect()
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}
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fn as_string(&self) -> String {
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if self.function.is_some() {
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"[type Function]".to_string()
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} else {
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"[object Object]".to_string()
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}
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}
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fn type_of(&self) -> &'static str {
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self.type_of
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}
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fn as_script_object(&self) -> Option<&ScriptObject<'gc>> {
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Some(self)
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}
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fn as_script_object_mut(&mut self) -> Option<&mut ScriptObject<'gc>> {
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Some(self)
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}
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/// Get the underlying display node for this object, if it exists.
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fn as_display_node(&self) -> Option<DisplayNode<'gc>> {
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self.display_node
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}
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/// Returns a copy of a given function.
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///
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/// TODO: We have to clone here because of how executables are stored on
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/// objects directly. This might not be a good idea for performance.
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fn as_executable(&self) -> Option<Executable<'gc>> {
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self.function.clone()
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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|
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use crate::avm1::activation::Activation;
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use crate::avm1::property::Attribute::*;
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use crate::backend::audio::NullAudioBackend;
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use crate::backend::navigator::NullNavigatorBackend;
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use crate::backend::render::NullRenderer;
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use crate::display_object::{DisplayObject, MovieClip};
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use crate::library::Library;
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use crate::prelude::*;
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use gc_arena::rootless_arena;
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use rand::{rngs::SmallRng, SeedableRng};
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use std::sync::Arc;
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|
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fn with_object<F, R>(swf_version: u8, test: F) -> R
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|
where
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F: for<'a, 'gc> FnOnce(
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&mut Avm1<'gc>,
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&mut UpdateContext<'a, 'gc, '_>,
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ObjectCell<'gc>,
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) -> R,
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{
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rootless_arena(|gc_context| {
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let mut avm = Avm1::new(gc_context, swf_version);
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let movie_clip: Box<dyn DisplayObject> =
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Box::new(MovieClip::new(swf_version, gc_context));
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let root = GcCell::allocate(gc_context, movie_clip);
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let mut context = UpdateContext {
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gc_context,
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global_time: 0,
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player_version: 32,
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swf_version,
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root,
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start_clip: root,
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active_clip: root,
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target_clip: Some(root),
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target_path: Value::Undefined,
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rng: &mut SmallRng::from_seed([0u8; 16]),
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action_queue: &mut crate::context::ActionQueue::new(),
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audio: &mut NullAudioBackend::new(),
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background_color: &mut Color {
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r: 0,
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g: 0,
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b: 0,
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a: 0,
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},
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library: &mut Library::new(),
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navigator: &mut NullNavigatorBackend::new(),
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renderer: &mut NullRenderer::new(),
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swf_data: &mut Arc::new(vec![]),
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|
system_prototypes: avm.prototypes().clone(),
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||
|
};
|
||
|
|
||
|
let object = GcCell::allocate(
|
||
|
gc_context,
|
||
|
Box::new(ScriptObject::object(
|
||
|
gc_context,
|
||
|
Some(avm.prototypes().object),
|
||
|
)) as Box<dyn Object<'_>>,
|
||
|
);
|
||
|
|
||
|
let globals = avm.global_object_cell();
|
||
|
avm.insert_stack_frame(GcCell::allocate(
|
||
|
gc_context,
|
||
|
Activation::from_nothing(swf_version, globals, gc_context),
|
||
|
));
|
||
|
|
||
|
test(&mut avm, &mut context, object)
|
||
|
})
|
||
|
}
|
||
|
|
||
|
#[test]
|
||
|
fn test_get_undefined() {
|
||
|
with_object(0, |avm, context, object| {
|
||
|
assert_eq!(
|
||
|
object
|
||
|
.read()
|
||
|
.get("not_defined", avm, context, object)
|
||
|
.unwrap(),
|
||
|
ReturnValue::Immediate(Value::Undefined)
|
||
|
);
|
||
|
})
|
||
|
}
|
||
|
|
||
|
#[test]
|
||
|
fn test_set_get() {
|
||
|
with_object(0, |avm, context, object| {
|
||
|
object
|
||
|
.write(context.gc_context)
|
||
|
.as_script_object_mut()
|
||
|
.unwrap()
|
||
|
.force_set("forced", "forced", EnumSet::empty());
|
||
|
object
|
||
|
.write(context.gc_context)
|
||
|
.set("natural", "natural".into(), avm, context, object)
|
||
|
.unwrap();
|
||
|
|
||
|
assert_eq!(
|
||
|
object.read().get("forced", avm, context, object).unwrap(),
|
||
|
ReturnValue::Immediate("forced".into())
|
||
|
);
|
||
|
assert_eq!(
|
||
|
object.read().get("natural", avm, context, object).unwrap(),
|
||
|
ReturnValue::Immediate("natural".into())
|
||
|
);
|
||
|
})
|
||
|
}
|
||
|
|
||
|
#[test]
|
||
|
fn test_set_readonly() {
|
||
|
with_object(0, |avm, context, object| {
|
||
|
object
|
||
|
.write(context.gc_context)
|
||
|
.as_script_object_mut()
|
||
|
.unwrap()
|
||
|
.force_set("normal", "initial", EnumSet::empty());
|
||
|
object
|
||
|
.write(context.gc_context)
|
||
|
.as_script_object_mut()
|
||
|
.unwrap()
|
||
|
.force_set("readonly", "initial", ReadOnly);
|
||
|
|
||
|
object
|
||
|
.write(context.gc_context)
|
||
|
.set("normal", "replaced".into(), avm, context, object)
|
||
|
.unwrap();
|
||
|
object
|
||
|
.write(context.gc_context)
|
||
|
.set("readonly", "replaced".into(), avm, context, object)
|
||
|
.unwrap();
|
||
|
|
||
|
assert_eq!(
|
||
|
object.read().get("normal", avm, context, object).unwrap(),
|
||
|
ReturnValue::Immediate("replaced".into())
|
||
|
);
|
||
|
assert_eq!(
|
||
|
object.read().get("readonly", avm, context, object).unwrap(),
|
||
|
ReturnValue::Immediate("initial".into())
|
||
|
);
|
||
|
})
|
||
|
}
|
||
|
|
||
|
#[test]
|
||
|
fn test_deletable_not_readonly() {
|
||
|
with_object(0, |avm, context, object| {
|
||
|
object
|
||
|
.write(context.gc_context)
|
||
|
.as_script_object_mut()
|
||
|
.unwrap()
|
||
|
.force_set("test", "initial", DontDelete);
|
||
|
|
||
|
assert_eq!(object.write(context.gc_context).delete("test"), false);
|
||
|
assert_eq!(
|
||
|
object.read().get("test", avm, context, object).unwrap(),
|
||
|
ReturnValue::Immediate("initial".into())
|
||
|
);
|
||
|
|
||
|
object
|
||
|
.write(context.gc_context)
|
||
|
.as_script_object_mut()
|
||
|
.unwrap()
|
||
|
.set("test", "replaced".into(), avm, context, object)
|
||
|
.unwrap();
|
||
|
|
||
|
assert_eq!(object.write(context.gc_context).delete("test"), false);
|
||
|
assert_eq!(
|
||
|
object.read().get("test", avm, context, object).unwrap(),
|
||
|
ReturnValue::Immediate("replaced".into())
|
||
|
);
|
||
|
})
|
||
|
}
|
||
|
|
||
|
#[test]
|
||
|
fn test_virtual_get() {
|
||
|
with_object(0, |avm, context, object| {
|
||
|
let getter = Executable::Native(|_avm, _context, _this, _args| {
|
||
|
Ok(ReturnValue::Immediate("Virtual!".into()))
|
||
|
});
|
||
|
|
||
|
object
|
||
|
.write(context.gc_context)
|
||
|
.as_script_object_mut()
|
||
|
.unwrap()
|
||
|
.force_set_virtual("test", getter, None, EnumSet::empty());
|
||
|
|
||
|
assert_eq!(
|
||
|
object.read().get("test", avm, context, object).unwrap(),
|
||
|
ReturnValue::Immediate("Virtual!".into())
|
||
|
);
|
||
|
|
||
|
// This set should do nothing
|
||
|
object
|
||
|
.write(context.gc_context)
|
||
|
.set("test", "Ignored!".into(), avm, context, object)
|
||
|
.unwrap();
|
||
|
assert_eq!(
|
||
|
object.read().get("test", avm, context, object).unwrap(),
|
||
|
ReturnValue::Immediate("Virtual!".into())
|
||
|
);
|
||
|
})
|
||
|
}
|
||
|
|
||
|
#[test]
|
||
|
fn test_delete() {
|
||
|
with_object(0, |avm, context, object| {
|
||
|
let getter = Executable::Native(|_avm, _context, _this, _args| {
|
||
|
Ok(ReturnValue::Immediate("Virtual!".into()))
|
||
|
});
|
||
|
|
||
|
object
|
||
|
.write(context.gc_context)
|
||
|
.as_script_object_mut()
|
||
|
.unwrap()
|
||
|
.force_set_virtual("virtual", getter.clone(), None, EnumSet::empty());
|
||
|
object
|
||
|
.write(context.gc_context)
|
||
|
.as_script_object_mut()
|
||
|
.unwrap()
|
||
|
.force_set_virtual("virtual_un", getter, None, DontDelete);
|
||
|
object
|
||
|
.write(context.gc_context)
|
||
|
.as_script_object_mut()
|
||
|
.unwrap()
|
||
|
.force_set("stored", "Stored!", EnumSet::empty());
|
||
|
object
|
||
|
.write(context.gc_context)
|
||
|
.as_script_object_mut()
|
||
|
.unwrap()
|
||
|
.force_set("stored_un", "Stored!", DontDelete);
|
||
|
|
||
|
assert_eq!(object.write(context.gc_context).delete("virtual"), true);
|
||
|
assert_eq!(object.write(context.gc_context).delete("virtual_un"), false);
|
||
|
assert_eq!(object.write(context.gc_context).delete("stored"), true);
|
||
|
assert_eq!(object.write(context.gc_context).delete("stored_un"), false);
|
||
|
assert_eq!(
|
||
|
object.write(context.gc_context).delete("non_existent"),
|
||
|
false
|
||
|
);
|
||
|
|
||
|
assert_eq!(
|
||
|
object.read().get("virtual", avm, context, object).unwrap(),
|
||
|
ReturnValue::Immediate(Value::Undefined)
|
||
|
);
|
||
|
assert_eq!(
|
||
|
object
|
||
|
.read()
|
||
|
.get("virtual_un", avm, context, object)
|
||
|
.unwrap(),
|
||
|
ReturnValue::Immediate("Virtual!".into())
|
||
|
);
|
||
|
assert_eq!(
|
||
|
object.read().get("stored", avm, context, object).unwrap(),
|
||
|
ReturnValue::Immediate(Value::Undefined)
|
||
|
);
|
||
|
assert_eq!(
|
||
|
object
|
||
|
.read()
|
||
|
.get("stored_un", avm, context, object)
|
||
|
.unwrap(),
|
||
|
ReturnValue::Immediate("Stored!".into())
|
||
|
);
|
||
|
})
|
||
|
}
|
||
|
|
||
|
#[test]
|
||
|
fn test_iter_values() {
|
||
|
with_object(0, |_avm, context, object| {
|
||
|
let getter = Executable::Native(|_avm, _context, _this, _args| {
|
||
|
Ok(ReturnValue::Immediate(Value::Null))
|
||
|
});
|
||
|
|
||
|
object
|
||
|
.write(context.gc_context)
|
||
|
.as_script_object_mut()
|
||
|
.unwrap()
|
||
|
.force_set("stored", Value::Null, EnumSet::empty());
|
||
|
object
|
||
|
.write(context.gc_context)
|
||
|
.as_script_object_mut()
|
||
|
.unwrap()
|
||
|
.force_set("stored_hidden", Value::Null, DontEnum);
|
||
|
object
|
||
|
.write(context.gc_context)
|
||
|
.as_script_object_mut()
|
||
|
.unwrap()
|
||
|
.force_set_virtual("virtual", getter.clone(), None, EnumSet::empty());
|
||
|
object
|
||
|
.write(context.gc_context)
|
||
|
.as_script_object_mut()
|
||
|
.unwrap()
|
||
|
.force_set_virtual("virtual_hidden", getter, None, DontEnum);
|
||
|
|
||
|
let keys = object.read().get_keys();
|
||
|
assert_eq!(keys.len(), 2);
|
||
|
assert_eq!(keys.contains(&"stored".to_string()), true);
|
||
|
assert_eq!(keys.contains(&"stored_hidden".to_string()), false);
|
||
|
assert_eq!(keys.contains(&"virtual".to_string()), true);
|
||
|
assert_eq!(keys.contains(&"virtual_hidden".to_string()), false);
|
||
|
})
|
||
|
}
|
||
|
}
|