152 lines
4.5 KiB
Rust
152 lines
4.5 KiB
Rust
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//! Property data structures
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use self::Attribute::*;
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use crate::avm2::function::Executable;
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use crate::avm2::object::Object;
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use crate::avm2::return_value::ReturnValue;
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use crate::avm2::value::Value;
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use crate::avm2::{Avm2, Error};
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use crate::context::UpdateContext;
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use enumset::{EnumSet, EnumSetType};
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use gc_arena::{Collect, CollectionContext};
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use std::mem::replace;
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/// Attributes of properties in the AVM runtime.
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///
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/// TODO: Replace with AVM2 properties for traits
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#[derive(EnumSetType, Debug)]
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pub enum Attribute {
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DontEnum,
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DontDelete,
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ReadOnly,
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}
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#[allow(clippy::large_enum_variant)]
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#[derive(Clone, Debug)]
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pub enum Property<'gc> {
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Virtual {
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get: Executable<'gc>,
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set: Option<Executable<'gc>>,
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attributes: EnumSet<Attribute>,
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},
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Stored {
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value: Value<'gc>,
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attributes: EnumSet<Attribute>,
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},
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}
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unsafe impl<'gc> Collect for Property<'gc> {
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fn trace(&self, cc: CollectionContext) {
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match self {
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Property::Virtual { get, set, .. } => {
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get.trace(cc);
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set.trace(cc);
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}
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Property::Stored { value, .. } => value.trace(cc),
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}
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}
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}
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impl<'gc> Property<'gc> {
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/// Convert a value into a dynamic property.
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pub fn new_dynamic_property(value: impl Into<Value<'gc>>) -> Self {
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Property::Stored {
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value: value.into(),
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attributes: EnumSet::empty(),
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}
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}
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/// Get the value of a property slot.
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///
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/// This function yields `ReturnValue` because some properties may be
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/// user-defined.
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pub fn get(
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&self,
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avm: &mut Avm2<'gc>,
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context: &mut UpdateContext<'_, 'gc, '_>,
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this: Object<'gc>,
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) -> Result<ReturnValue<'gc>, Error> {
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match self {
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Property::Virtual { get, .. } => get.exec(avm, context, this, &[]),
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Property::Stored { value, .. } => Ok(value.to_owned().into()),
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}
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}
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/// Set a property slot.
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///
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/// This function returns `true` if the set has completed, or `false` if
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/// it has not yet occured. If `false`, and you need to run code after the
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/// set has occured, you must recursively execute the top-most frame via
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/// `run_current_frame`.
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pub fn set(
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&mut self,
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avm: &mut Avm2<'gc>,
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context: &mut UpdateContext<'_, 'gc, '_>,
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this: Object<'gc>,
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new_value: impl Into<Value<'gc>>,
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) -> Result<bool, Error> {
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match self {
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Property::Virtual { set, .. } => {
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if let Some(function) = set {
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let return_value = function.exec(avm, context, this, &[new_value.into()])?;
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Ok(return_value.is_immediate())
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} else {
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Ok(true)
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}
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}
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Property::Stored {
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value, attributes, ..
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} => {
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if !attributes.contains(ReadOnly) {
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replace::<Value<'gc>>(value, new_value.into());
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}
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Ok(true)
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}
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}
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}
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/// List this property's attributes.
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pub fn attributes(&self) -> EnumSet<Attribute> {
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match self {
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Property::Virtual { attributes, .. } => *attributes,
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Property::Stored { attributes, .. } => *attributes,
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}
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}
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/// Re-define this property's attributes.
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pub fn set_attributes(&mut self, new_attributes: EnumSet<Attribute>) {
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match self {
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Property::Virtual {
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ref mut attributes, ..
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} => *attributes = new_attributes,
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Property::Stored {
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ref mut attributes, ..
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} => *attributes = new_attributes,
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}
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}
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pub fn can_delete(&self) -> bool {
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match self {
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Property::Virtual { attributes, .. } => !attributes.contains(DontDelete),
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Property::Stored { attributes, .. } => !attributes.contains(DontDelete),
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}
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}
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pub fn is_enumerable(&self) -> bool {
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match self {
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Property::Virtual { attributes, .. } => !attributes.contains(DontEnum),
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Property::Stored { attributes, .. } => !attributes.contains(DontEnum),
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}
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}
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pub fn is_overwritable(&self) -> bool {
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match self {
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Property::Virtual {
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attributes, set, ..
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} => !attributes.contains(ReadOnly) && !set.is_none(),
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Property::Stored { attributes, .. } => !attributes.contains(ReadOnly),
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}
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}
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}
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