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Copy pathpybool.rs
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205 lines (182 loc) · 6.56 KB
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use super::{PyInt, PyStrRef, PyTypeRef};
use crate::{
function::OptionalArg, slots::SlotConstructor, IdProtocol, IntoPyObject, PyClassImpl,
PyContext, PyObjectRef, PyResult, PyValue, TryFromBorrowedObject, TryFromObject, TypeProtocol,
VirtualMachine,
};
use num_bigint::Sign;
use num_traits::Zero;
use std::fmt::{Debug, Formatter};
impl IntoPyObject for bool {
fn into_pyobject(self, vm: &VirtualMachine) -> PyObjectRef {
vm.ctx.new_bool(self)
}
}
impl TryFromBorrowedObject for bool {
fn try_from_borrowed_object(vm: &VirtualMachine, obj: &PyObjectRef) -> PyResult<bool> {
if obj.isinstance(&vm.ctx.types.int_type) {
Ok(get_value(obj))
} else {
Err(vm.new_type_error(format!("Expected type bool, not {}", obj.class().name())))
}
}
}
impl PyObjectRef {
/// Convert Python bool into Rust bool.
pub fn try_to_bool(self, vm: &VirtualMachine) -> PyResult<bool> {
if self.is(&vm.ctx.true_value) {
return Ok(true);
}
if self.is(&vm.ctx.false_value) {
return Ok(false);
}
let rs_bool = match vm.get_method(self.clone(), "__bool__") {
Some(method_or_err) => {
// If descriptor returns Error, propagate it further
let method = method_or_err?;
let bool_obj = vm.invoke(&method, ())?;
if !bool_obj.isinstance(&vm.ctx.types.bool_type) {
return Err(vm.new_type_error(format!(
"__bool__ should return bool, returned type {}",
bool_obj.class().name()
)));
}
get_value(&bool_obj)
}
None => match vm.get_method(self, "__len__") {
Some(method_or_err) => {
let method = method_or_err?;
let bool_obj = vm.invoke(&method, ())?;
let int_obj = bool_obj.payload::<PyInt>().ok_or_else(|| {
vm.new_type_error(format!(
"'{}' object cannot be interpreted as an integer",
bool_obj.class().name()
))
})?;
let len_val = int_obj.as_bigint();
if len_val.sign() == Sign::Minus {
return Err(vm.new_value_error("__len__() should return >= 0".to_owned()));
}
!len_val.is_zero()
}
None => true,
},
};
Ok(rs_bool)
}
}
/// bool(x) -> bool
///
/// Returns True when the argument x is true, False otherwise.
/// The builtins True and False are the only two instances of the class bool.
/// The class bool is a subclass of the class int, and cannot be subclassed.
#[pyclass(name = "bool", module = false, base = "PyInt")]
pub struct PyBool;
impl PyValue for PyBool {
fn class(vm: &VirtualMachine) -> &PyTypeRef {
&vm.ctx.types.bool_type
}
}
impl Debug for PyBool {
fn fmt(&self, _f: &mut Formatter<'_>) -> std::fmt::Result {
todo!()
}
}
impl SlotConstructor for PyBool {
type Args = OptionalArg<PyObjectRef>;
fn py_new(zelf: PyTypeRef, x: Self::Args, vm: &VirtualMachine) -> PyResult {
if !zelf.isinstance(&vm.ctx.types.type_type) {
let actual_type = &zelf.class().name();
return Err(vm.new_type_error(format!(
"requires a 'type' object but received a '{}'",
actual_type
)));
}
let val = x.map_or(Ok(false), |val| val.try_to_bool(vm))?;
Ok(vm.ctx.new_bool(val))
}
}
#[pyimpl(with(SlotConstructor))]
impl PyBool {
#[pymethod(magic)]
fn repr(zelf: bool) -> String {
if zelf { "True" } else { "False" }.to_owned()
}
#[pymethod(magic)]
fn format(obj: PyObjectRef, format_spec: PyStrRef, vm: &VirtualMachine) -> PyResult<PyStrRef> {
if format_spec.as_str().is_empty() {
vm.to_str(&obj)
} else {
Err(vm.new_type_error("unsupported format string passed to bool.__format__".to_owned()))
}
}
#[pymethod(name = "__ror__")]
#[pymethod(magic)]
fn or(lhs: PyObjectRef, rhs: PyObjectRef, vm: &VirtualMachine) -> PyObjectRef {
if lhs.isinstance(&vm.ctx.types.bool_type) && rhs.isinstance(&vm.ctx.types.bool_type) {
let lhs = get_value(&lhs);
let rhs = get_value(&rhs);
(lhs || rhs).into_pyobject(vm)
} else {
get_py_int(&lhs).or(rhs, vm).into_pyobject(vm)
}
}
#[pymethod(name = "__rand__")]
#[pymethod(magic)]
fn and(lhs: PyObjectRef, rhs: PyObjectRef, vm: &VirtualMachine) -> PyObjectRef {
if lhs.isinstance(&vm.ctx.types.bool_type) && rhs.isinstance(&vm.ctx.types.bool_type) {
let lhs = get_value(&lhs);
let rhs = get_value(&rhs);
(lhs && rhs).into_pyobject(vm)
} else {
get_py_int(&lhs).and(rhs, vm).into_pyobject(vm)
}
}
#[pymethod(name = "__rxor__")]
#[pymethod(magic)]
fn xor(lhs: PyObjectRef, rhs: PyObjectRef, vm: &VirtualMachine) -> PyObjectRef {
if lhs.isinstance(&vm.ctx.types.bool_type) && rhs.isinstance(&vm.ctx.types.bool_type) {
let lhs = get_value(&lhs);
let rhs = get_value(&rhs);
(lhs ^ rhs).into_pyobject(vm)
} else {
get_py_int(&lhs).xor(rhs, vm).into_pyobject(vm)
}
}
}
pub(crate) fn init(context: &PyContext) {
PyBool::extend_class(context, &context.types.bool_type);
}
// pub fn not(vm: &VirtualMachine, obj: &PyObjectRef) -> PyResult<bool> {
// if obj.isinstance(&vm.ctx.types.bool_type) {
// let value = get_value(obj);
// Ok(!value)
// } else {
// Err(vm.new_type_error(format!("Can only invert a bool, on {:?}", obj)))
// }
// }
// Retrieve inner int value:
pub(crate) fn get_value(obj: &PyObjectRef) -> bool {
!obj.payload::<PyInt>().unwrap().as_bigint().is_zero()
}
fn get_py_int(obj: &PyObjectRef) -> &PyInt {
obj.payload::<PyInt>().unwrap()
}
#[derive(Debug, Default, Copy, Clone, PartialEq)]
pub struct IntoPyBool {
value: bool,
}
impl IntoPyBool {
pub const TRUE: IntoPyBool = IntoPyBool { value: true };
pub const FALSE: IntoPyBool = IntoPyBool { value: false };
pub fn to_bool(self) -> bool {
self.value
}
}
impl TryFromObject for IntoPyBool {
fn try_from_object(vm: &VirtualMachine, obj: PyObjectRef) -> PyResult<Self> {
Ok(IntoPyBool {
value: obj.try_to_bool(vm)?,
})
}
}