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codecs.rs
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pub(crate) use _codecs::make_module;
#[pymodule]
mod _codecs {
use crate::common::encodings;
use crate::{
builtins::{PyBaseExceptionRef, PyBytes, PyBytesRef, PyStr, PyStrRef, PyTuple},
codecs,
function::{ArgBytesLike, FuncArgs},
AsObject, PyObject, PyObjectRef, PyResult, TryFromBorrowedObject, VirtualMachine,
};
use std::ops::Range;
#[pyfunction]
fn register(search_function: PyObjectRef, vm: &VirtualMachine) -> PyResult<()> {
vm.state.codec_registry.register(search_function, vm)
}
#[pyfunction]
fn unregister(search_function: PyObjectRef, vm: &VirtualMachine) -> PyResult<()> {
vm.state.codec_registry.unregister(search_function)
}
#[pyfunction]
fn lookup(encoding: PyStrRef, vm: &VirtualMachine) -> PyResult {
vm.state
.codec_registry
.lookup(encoding.as_str(), vm)
.map(|codec| codec.into_tuple().into())
}
#[derive(FromArgs)]
struct CodeArgs {
obj: PyObjectRef,
#[pyarg(any, optional)]
encoding: Option<PyStrRef>,
#[pyarg(any, optional)]
errors: Option<PyStrRef>,
}
#[pyfunction]
fn encode(args: CodeArgs, vm: &VirtualMachine) -> PyResult {
let encoding = args
.encoding
.as_ref()
.map_or(codecs::DEFAULT_ENCODING, |s| s.as_str());
vm.state
.codec_registry
.encode(args.obj, encoding, args.errors, vm)
}
#[pyfunction]
fn decode(args: CodeArgs, vm: &VirtualMachine) -> PyResult {
let encoding = args
.encoding
.as_ref()
.map_or(codecs::DEFAULT_ENCODING, |s| s.as_str());
vm.state
.codec_registry
.decode(args.obj, encoding, args.errors, vm)
}
#[pyfunction]
fn _forget_codec(encoding: PyStrRef, vm: &VirtualMachine) {
vm.state.codec_registry.forget(encoding.as_str());
}
#[pyfunction]
fn register_error(name: PyStrRef, handler: PyObjectRef, vm: &VirtualMachine) {
vm.state
.codec_registry
.register_error(name.as_str().to_owned(), handler);
}
#[pyfunction]
fn lookup_error(name: PyStrRef, vm: &VirtualMachine) -> PyResult {
vm.state.codec_registry.lookup_error(name.as_str(), vm)
}
struct ErrorsHandler<'a> {
vm: &'a VirtualMachine,
encoding: &'a str,
errors: Option<PyStrRef>,
handler: once_cell::unsync::OnceCell<PyObjectRef>,
}
impl<'a> ErrorsHandler<'a> {
#[inline]
fn new(encoding: &'a str, errors: Option<PyStrRef>, vm: &'a VirtualMachine) -> Self {
ErrorsHandler {
vm,
encoding,
errors,
handler: Default::default(),
}
}
#[inline]
fn handler_func(&self) -> PyResult<&PyObject> {
let vm = self.vm;
Ok(self.handler.get_or_try_init(|| {
let errors = self.errors.as_ref().map_or("strict", |s| s.as_str());
vm.state.codec_registry.lookup_error(errors, vm)
})?)
}
}
impl encodings::StrBuffer for PyStrRef {
fn is_ascii(&self) -> bool {
PyStr::is_ascii(self)
}
}
impl<'vm> encodings::ErrorHandler for ErrorsHandler<'vm> {
type Error = PyBaseExceptionRef;
type StrBuf = PyStrRef;
type BytesBuf = PyBytesRef;
fn handle_encode_error(
&self,
data: &str,
char_range: Range<usize>,
reason: &str,
) -> PyResult<(encodings::EncodeReplace<PyStrRef, PyBytesRef>, usize)> {
let vm = self.vm;
let data_str = vm.ctx.new_str(data).into();
let encode_exc = vm.new_exception(
vm.ctx.exceptions.unicode_encode_error.to_owned(),
vec![
vm.ctx.new_str(self.encoding).into(),
data_str,
vm.ctx.new_int(char_range.start).into(),
vm.ctx.new_int(char_range.end).into(),
vm.ctx.new_str(reason).into(),
],
);
let res = self.handler_func()?.call((encode_exc,), vm)?;
let tuple_err = || {
vm.new_type_error(
"encoding error handler must return (str/bytes, int) tuple".to_owned(),
)
};
let (replace, restart) = match res.payload::<PyTuple>().map(|tup| tup.as_slice()) {
Some([replace, restart]) => (replace.clone(), restart),
_ => return Err(tuple_err()),
};
let replace = match_class!(match replace {
s @ PyStr => encodings::EncodeReplace::Str(s),
b @ PyBytes => encodings::EncodeReplace::Bytes(b),
_ => return Err(tuple_err()),
});
let restart = isize::try_from_borrowed_object(vm, restart).map_err(|_| tuple_err())?;
let restart = if restart < 0 {
// will still be out of bounds if it underflows ¯\_(ツ)_/¯
data.len().wrapping_sub(restart.unsigned_abs())
} else {
restart as usize
};
Ok((replace, restart))
}
fn handle_decode_error(
&self,
data: &[u8],
byte_range: Range<usize>,
reason: &str,
) -> PyResult<(PyStrRef, Option<PyBytesRef>, usize)> {
let vm = self.vm;
let data_bytes: PyObjectRef = vm.ctx.new_bytes(data.to_vec()).into();
let decode_exc = vm.new_exception(
vm.ctx.exceptions.unicode_decode_error.to_owned(),
vec![
vm.ctx.new_str(self.encoding).into(),
data_bytes.clone(),
vm.ctx.new_int(byte_range.start).into(),
vm.ctx.new_int(byte_range.end).into(),
vm.ctx.new_str(reason).into(),
],
);
let handler = self.handler_func()?;
let res = handler.call((decode_exc.clone(),), vm)?;
let new_data = decode_exc
.get_arg(1)
.ok_or_else(|| vm.new_type_error("object attribute not set".to_owned()))?;
let new_data = if new_data.is(&data_bytes) {
None
} else {
let new_data: PyBytesRef = new_data
.downcast()
.map_err(|_| vm.new_type_error("object attribute must be bytes".to_owned()))?;
Some(new_data)
};
let data = new_data.as_ref().map_or(data, |s| s.as_ref());
let tuple_err = || {
vm.new_type_error("decoding error handler must return (str, int) tuple".to_owned())
};
match res.payload::<PyTuple>().map(|tup| tup.as_slice()) {
Some([replace, restart]) => {
let replace = replace
.downcast_ref::<PyStr>()
.ok_or_else(tuple_err)?
.to_owned();
let restart =
isize::try_from_borrowed_object(vm, restart).map_err(|_| tuple_err())?;
let restart = if restart < 0 {
// will still be out of bounds if it underflows ¯\_(ツ)_/¯
data.len().wrapping_sub(restart.unsigned_abs())
} else {
restart as usize
};
Ok((replace, new_data, restart))
}
_ => Err(tuple_err()),
}
}
fn error_oob_restart(&self, i: usize) -> PyBaseExceptionRef {
self.vm
.new_index_error(format!("position {i} from error handler out of bounds"))
}
fn error_encoding(
&self,
data: &str,
char_range: Range<usize>,
reason: &str,
) -> Self::Error {
let vm = self.vm;
vm.new_exception(
vm.ctx.exceptions.unicode_encode_error.to_owned(),
vec![
vm.ctx.new_str(self.encoding).into(),
vm.ctx.new_str(data).into(),
vm.ctx.new_int(char_range.start).into(),
vm.ctx.new_int(char_range.end).into(),
vm.ctx.new_str(reason).into(),
],
)
}
}
type EncodeResult = PyResult<(Vec<u8>, usize)>;
#[derive(FromArgs)]
struct EncodeArgs {
#[pyarg(positional)]
s: PyStrRef,
#[pyarg(positional, optional)]
errors: Option<PyStrRef>,
}
impl EncodeArgs {
#[inline]
fn encode<'a, F>(self, name: &'a str, encode: F, vm: &'a VirtualMachine) -> EncodeResult
where
F: FnOnce(&str, &ErrorsHandler<'a>) -> PyResult<Vec<u8>>,
{
let errors = ErrorsHandler::new(name, self.errors, vm);
let encoded = encode(self.s.as_str(), &errors)?;
Ok((encoded, self.s.char_len()))
}
}
type DecodeResult = PyResult<(String, usize)>;
#[derive(FromArgs)]
struct DecodeArgs {
#[pyarg(positional)]
data: ArgBytesLike,
#[pyarg(positional, optional)]
errors: Option<PyStrRef>,
#[pyarg(positional, default = "false")]
final_decode: bool,
}
impl DecodeArgs {
#[inline]
fn decode<'a, F>(self, name: &'a str, decode: F, vm: &'a VirtualMachine) -> DecodeResult
where
F: FnOnce(&[u8], &ErrorsHandler<'a>, bool) -> DecodeResult,
{
let data = self.data.borrow_buf();
let errors = ErrorsHandler::new(name, self.errors, vm);
decode(&data, &errors, self.final_decode)
}
}
#[derive(FromArgs)]
struct DecodeArgsNoFinal {
#[pyarg(positional)]
data: ArgBytesLike,
#[pyarg(positional, optional)]
errors: Option<PyStrRef>,
}
impl DecodeArgsNoFinal {
#[inline]
fn decode<'a, F>(self, name: &'a str, decode: F, vm: &'a VirtualMachine) -> DecodeResult
where
F: FnOnce(&[u8], &ErrorsHandler<'a>) -> DecodeResult,
{
let data = self.data.borrow_buf();
let errors = ErrorsHandler::new(name, self.errors, vm);
decode(&data, &errors)
}
}
macro_rules! do_codec {
($module:ident :: $func:ident, $args: expr, $vm:expr) => {{
use encodings::$module as codec;
$args.$func(codec::ENCODING_NAME, codec::$func, $vm)
}};
}
#[pyfunction]
fn utf_8_encode(args: EncodeArgs, vm: &VirtualMachine) -> EncodeResult {
do_codec!(utf8::encode, args, vm)
}
#[pyfunction]
fn utf_8_decode(args: DecodeArgs, vm: &VirtualMachine) -> DecodeResult {
do_codec!(utf8::decode, args, vm)
}
#[pyfunction]
fn latin_1_encode(args: EncodeArgs, vm: &VirtualMachine) -> EncodeResult {
if args.s.is_ascii() {
return Ok((args.s.as_str().as_bytes().to_vec(), args.s.byte_len()));
}
do_codec!(latin_1::encode, args, vm)
}
#[pyfunction]
fn latin_1_decode(args: DecodeArgsNoFinal, vm: &VirtualMachine) -> DecodeResult {
do_codec!(latin_1::decode, args, vm)
}
#[pyfunction]
fn ascii_encode(args: EncodeArgs, vm: &VirtualMachine) -> EncodeResult {
if args.s.is_ascii() {
return Ok((args.s.as_str().as_bytes().to_vec(), args.s.byte_len()));
}
do_codec!(ascii::encode, args, vm)
}
#[pyfunction]
fn ascii_decode(args: DecodeArgsNoFinal, vm: &VirtualMachine) -> DecodeResult {
do_codec!(ascii::decode, args, vm)
}
// TODO: implement these codecs in Rust!
use crate::common::static_cell::StaticCell;
#[inline]
fn delegate_pycodecs(
cell: &'static StaticCell<PyObjectRef>,
name: &str,
args: FuncArgs,
vm: &VirtualMachine,
) -> PyResult {
let f = cell.get_or_try_init(|| {
let module = vm.import("_pycodecs", None, 0)?;
module.get_attr(name, vm)
})?;
f.call(args, vm)
}
macro_rules! delegate_pycodecs {
($name:ident, $args:ident, $vm:ident) => {{
rustpython_common::static_cell!(
static FUNC: PyObjectRef;
);
delegate_pycodecs(&FUNC, stringify!($name), $args, $vm)
}};
}
#[pyfunction]
fn mbcs_encode(args: FuncArgs, vm: &VirtualMachine) -> PyResult {
delegate_pycodecs!(mbcs_encode, args, vm)
}
#[pyfunction]
fn mbcs_decode(args: FuncArgs, vm: &VirtualMachine) -> PyResult {
delegate_pycodecs!(mbcs_decode, args, vm)
}
#[pyfunction]
fn readbuffer_encode(args: FuncArgs, vm: &VirtualMachine) -> PyResult {
delegate_pycodecs!(readbuffer_encode, args, vm)
}
#[pyfunction]
fn escape_encode(args: FuncArgs, vm: &VirtualMachine) -> PyResult {
delegate_pycodecs!(escape_encode, args, vm)
}
#[pyfunction]
fn escape_decode(args: FuncArgs, vm: &VirtualMachine) -> PyResult {
delegate_pycodecs!(escape_decode, args, vm)
}
#[pyfunction]
fn unicode_escape_encode(args: FuncArgs, vm: &VirtualMachine) -> PyResult {
delegate_pycodecs!(unicode_escape_encode, args, vm)
}
#[pyfunction]
fn unicode_escape_decode(args: FuncArgs, vm: &VirtualMachine) -> PyResult {
delegate_pycodecs!(unicode_escape_decode, args, vm)
}
#[pyfunction]
fn raw_unicode_escape_encode(args: FuncArgs, vm: &VirtualMachine) -> PyResult {
delegate_pycodecs!(raw_unicode_escape_encode, args, vm)
}
#[pyfunction]
fn raw_unicode_escape_decode(args: FuncArgs, vm: &VirtualMachine) -> PyResult {
delegate_pycodecs!(raw_unicode_escape_decode, args, vm)
}
#[pyfunction]
fn utf_7_encode(args: FuncArgs, vm: &VirtualMachine) -> PyResult {
delegate_pycodecs!(utf_7_encode, args, vm)
}
#[pyfunction]
fn utf_7_decode(args: FuncArgs, vm: &VirtualMachine) -> PyResult {
delegate_pycodecs!(utf_7_decode, args, vm)
}
#[pyfunction]
fn utf_16_encode(args: FuncArgs, vm: &VirtualMachine) -> PyResult {
delegate_pycodecs!(utf_16_encode, args, vm)
}
#[pyfunction]
fn utf_16_decode(args: FuncArgs, vm: &VirtualMachine) -> PyResult {
delegate_pycodecs!(utf_16_decode, args, vm)
}
#[pyfunction]
fn charmap_encode(args: FuncArgs, vm: &VirtualMachine) -> PyResult {
delegate_pycodecs!(charmap_encode, args, vm)
}
#[pyfunction]
fn charmap_decode(args: FuncArgs, vm: &VirtualMachine) -> PyResult {
delegate_pycodecs!(charmap_decode, args, vm)
}
#[pyfunction]
fn charmap_build(args: FuncArgs, vm: &VirtualMachine) -> PyResult {
delegate_pycodecs!(charmap_build, args, vm)
}
#[pyfunction]
fn utf_16_le_encode(args: FuncArgs, vm: &VirtualMachine) -> PyResult {
delegate_pycodecs!(utf_16_le_encode, args, vm)
}
#[pyfunction]
fn utf_16_le_decode(args: FuncArgs, vm: &VirtualMachine) -> PyResult {
delegate_pycodecs!(utf_16_le_decode, args, vm)
}
#[pyfunction]
fn utf_16_be_encode(args: FuncArgs, vm: &VirtualMachine) -> PyResult {
delegate_pycodecs!(utf_16_be_encode, args, vm)
}
#[pyfunction]
fn utf_16_be_decode(args: FuncArgs, vm: &VirtualMachine) -> PyResult {
delegate_pycodecs!(utf_16_be_decode, args, vm)
}
#[pyfunction]
fn utf_16_ex_decode(args: FuncArgs, vm: &VirtualMachine) -> PyResult {
delegate_pycodecs!(utf_16_ex_decode, args, vm)
}
// TODO: utf-32 functions
}