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objenumerate.rs
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75 lines (63 loc) · 1.89 KB
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use std::cell::RefCell;
use std::ops::AddAssign;
use num_bigint::BigInt;
use num_traits::Zero;
use crate::function::OptionalArg;
use crate::pyobject::{PyClassImpl, PyContext, PyObjectRef, PyRef, PyResult, PyValue};
use crate::vm::VirtualMachine;
use super::objint::PyIntRef;
use super::objiter;
use super::objtype::PyClassRef;
#[pyclass]
#[derive(Debug)]
pub struct PyEnumerate {
counter: RefCell<BigInt>,
iterator: PyObjectRef,
}
type PyEnumerateRef = PyRef<PyEnumerate>;
impl PyValue for PyEnumerate {
fn class(vm: &VirtualMachine) -> PyClassRef {
vm.ctx.enumerate_type()
}
}
fn enumerate_new(
cls: PyClassRef,
iterable: PyObjectRef,
start: OptionalArg<PyIntRef>,
vm: &VirtualMachine,
) -> PyResult<PyEnumerateRef> {
let counter = match start {
OptionalArg::Present(start) => start.as_bigint().clone(),
OptionalArg::Missing => BigInt::zero(),
};
let iterator = objiter::get_iter(vm, &iterable)?;
PyEnumerate {
counter: RefCell::new(counter.clone()),
iterator,
}
.into_ref_with_type(vm, cls)
}
#[pyimpl]
impl PyEnumerate {
#[pymethod(name = "__next__")]
fn next(&self, vm: &VirtualMachine) -> PyResult {
let iterator = &self.iterator;
let counter = &self.counter;
let next_obj = objiter::call_next(vm, iterator)?;
let result = vm
.ctx
.new_tuple(vec![vm.ctx.new_int(counter.borrow().clone()), next_obj]);
AddAssign::add_assign(&mut counter.borrow_mut() as &mut BigInt, 1);
Ok(result)
}
#[pymethod(name = "__iter__")]
fn iter(zelf: PyRef<Self>, _vm: &VirtualMachine) -> PyRef<Self> {
zelf
}
}
pub fn init(context: &PyContext) {
PyEnumerate::extend_class(context, &context.types.enumerate_type);
extend_class!(context, &context.types.enumerate_type, {
"__new__" => context.new_rustfunc(enumerate_new),
});
}