77 lines
2.2 KiB
Rust
77 lines
2.2 KiB
Rust
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//! Represents AVM1 scope chain resolution.
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use std::cell::Ref;
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use gc_arena::{GcCell, MutationContext};
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use crate::avm1::{Object, Value};
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/// Represents a scope chain for an AVM1 activation.
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pub struct Scope<'gc> {
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parent: Option<GcCell<'gc, Scope<'gc>>>,
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values: GcCell<'gc, Object<'gc>>
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}
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unsafe impl<'gc> gc_arena::Collect for Scope<'gc> {
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#[inline]
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fn trace(&self, cc: gc_arena::CollectionContext) {
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self.parent.trace(cc);
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self.values.trace(cc);
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}
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}
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impl<'gc> Scope<'gc> {
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/// Construct a global scope (one without a parent).
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pub fn from_global_object(globals: GcCell<'gc, Object<'gc>>) -> Scope<'gc> {
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Scope {
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parent: None,
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values: globals
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}
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}
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/// Construct a child scope (one with a parent).
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pub fn from_parent_scope(parent: GcCell<'gc, Self>, mc: MutationContext<'gc, '_>) -> Scope<'gc> {
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Scope {
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parent: Some(parent.clone()),
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values: GcCell::allocate(mc, Object::bare_object())
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}
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}
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/// Returns a reference to the current local scope object.
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pub fn locals(&self) -> Ref<Object<'gc>> {
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self.values.read()
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}
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/// Resolve a particular value in the scope chain.
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pub fn resolve(&self, name: &str) -> Value<'gc> {
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let mut current_values = Some(self.values);
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while let Some(scope) = current_values {
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if scope.read().has_property(name) {
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return scope.read().get(name);
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}
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current_values = self.parent.map(|p| p.read().values);
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}
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Value::Undefined
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}
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/// Check if a particular property in the scope chain is defined.
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pub fn is_defined(&self, name: &str) -> bool {
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let mut current_values = Some(self.values);
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while let Some(scope) = current_values {
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if scope.read().has_property(name) {
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return true;
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}
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current_values = self.parent.map(|p| p.read().values);
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}
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false
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}
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/// Set a particular value in the current scope (and all child scopes)
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pub fn define(&self, name: &str, value: Value<'gc>, mc: MutationContext<'gc, '_>) {
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self.values.write(mc).set(name, value);
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}
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}
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