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Copy pathsliceobject.rs
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106 lines (99 loc) · 2.81 KB
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use crate::PyObject;
use crate::pystate::with_vm;
use core::ffi::c_int;
use rustpython_vm::PyPayload;
use rustpython_vm::builtins::PySlice;
use rustpython_vm::sliceable::SaturatedSlice;
#[unsafe(no_mangle)]
pub unsafe extern "C" fn PySlice_New(
start: *mut PyObject,
stop: *mut PyObject,
step: *mut PyObject,
) -> *mut PyObject {
with_vm(|vm| {
let start = if start.is_null() {
None
} else {
Some(unsafe { &*start }.to_owned())
};
let stop = if stop.is_null() {
vm.ctx.none()
} else {
unsafe { &*stop }.to_owned()
};
let step = if step.is_null() {
None
} else {
Some(unsafe { &*step }.to_owned())
};
Ok(PySlice { start, stop, step }.into_ref(&vm.ctx))
})
}
#[unsafe(no_mangle)]
pub unsafe extern "C" fn PySlice_Unpack(
slice: *mut PyObject,
start: *mut isize,
stop: *mut isize,
step: *mut isize,
) -> c_int {
with_vm(|vm| {
let slice = unsafe { &*slice }.try_downcast_ref::<PySlice>(vm)?;
let saturated = slice.to_saturated(vm)?;
unsafe {
*start = saturated.start();
*stop = saturated.stop();
*step = saturated.step();
}
Ok(())
})
}
#[unsafe(no_mangle)]
pub unsafe extern "C" fn PySlice_AdjustIndices(
length: isize,
start: *mut isize,
stop: *mut isize,
step: isize,
) -> isize {
let length = length.max(0) as usize;
let saturated = SaturatedSlice::from_parts(unsafe { *start }, unsafe { *stop }, step);
let (range, _, slice_len) = saturated.adjust_indices(length);
unsafe {
if step.is_negative() {
*start = range.end as isize - 1;
*stop = range.start as isize - 1;
} else {
*start = range.start as isize;
*stop = range.end as isize;
}
}
slice_len as isize
}
#[cfg(false)]
mod tests {
use pyo3::prelude::*;
use pyo3::types::{PySlice, PySliceMethods};
#[test]
fn slice_new_indices() {
Python::attach(|py| {
let slice = PySlice::new(py, 1, 10, 3);
let indices = slice.indices(100).unwrap();
assert_eq!((indices.start, indices.stop, indices.step), (1, 10, 3));
})
}
#[test]
fn slice_full_defaults() {
Python::attach(|py| {
let slice = PySlice::full(py);
let indices = slice.indices(5).unwrap();
assert_eq!((indices.start, indices.stop, indices.step), (0, 5, 1));
})
}
#[test]
fn slice_new_negative_step() {
Python::attach(|py| {
let slice = PySlice::new(py, 10, 1, -2);
let indices = slice.indices(100).unwrap();
assert_eq!((indices.start, indices.stop, indices.step), (10, 1, -2));
})
}
}