Struct RuntimePropertiesStackFrame

pub struct RuntimePropertiesStackFrame { /* private fields */ }

Data structure for a single frame of our runtime stack, including a reference to its parent frame and properties for runtime evaluation, e.g. of Expressions. RuntimePropertiesStackFrames also track timeline playhead position.

Components push RuntimePropertiesStackFrames before computing properties and pop them after computing, thus providing a hierarchical store of node-relevant data that can be bound to symbols in expressions.

Implementations

impl RuntimePropertiesStackFrame

pub fn new(properties: Rc<RefCell<dyn Any>>) -> Rc<Self>

pub fn push(self: &Rc<Self>, properties: &Rc<RefCell<dyn Any>>) -> Rc<Self>

pub fn pop(self: &Rc<Self>) -> Option<Rc<Self>>

pub fn peek_nth(self: &Rc<Self>, n: isize) -> Option<Rc<RefCell<dyn Any>>>

Traverses stack recursively n times to retrieve ancestor; useful for runtime lookups for identifiers, where n is the statically known offset determined by the Pax compiler when resolving a symbol

pub fn get_properties(&self) -> Rc<RefCell<dyn Any>>