use std::cell::RefCell;
use std::rc::Rc;
#[derive(Debug, Clone, Default)]
pub(crate) struct StackItem {
pub(crate) value: i32,
pub(crate) is_static: bool,
}
#[derive(Debug, Clone, Default)]
pub(crate) struct MaxNumparamStack {
stack: Rc<RefCell<Vec<StackItem>>>,
}
impl MaxNumparamStack {
const ORDINARY_PARAMS: i32 = -1;
pub(crate) fn new() -> Self {
Self {
stack: Rc::new(RefCell::new(vec![])),
}
}
pub(crate) fn is_empty(&self) -> bool {
self.stack.borrow().is_empty()
}
pub(crate) fn set_has_ordinary_params(&self) {
self.set(Self::ORDINARY_PARAMS)
}
pub(crate) fn has_ordinary_params(&self) -> bool {
self.top() == Self::ORDINARY_PARAMS
}
pub(crate) fn has_numparams(&self) -> bool {
self.top() > 0
}
pub(crate) fn register(&self, numparam: i32) {
self.set(std::cmp::max(self.top(), numparam))
}
pub(crate) fn top(&self) -> i32 {
if let Some(stack_item) = self.stack.borrow().last() {
stack_item.value
} else {
i32::MIN
}
}
pub(crate) fn push(&self, is_static: bool) {
self.stack.borrow_mut().push(StackItem {
value: 0,
is_static,
})
}
pub(crate) fn pop(&self) {
self.stack.borrow_mut().pop();
}
fn set(&self, value: i32) {
let mut stack = self.stack.borrow_mut();
let len = stack.len();
stack[len - 1].value = value;
}
pub(crate) fn inner_clone(&self) -> Vec<StackItem> {
self.stack.borrow().clone()
}
}