use std::string::FromUtf8Error;
use erg_common::cache::CacheSet;
use erg_common::config::{ErgConfig, Input};
use erg_common::dict::Dict;
use erg_common::error::{ErrorCore, ErrorKind, Location, SubMessage};
use erg_common::python_util::PythonVersion;
use erg_common::serialize::DataTypePrefix;
use erg_common::traits::ExitStatus;
use erg_common::{fn_name, switch_lang};
use erg_common::{RcArray, Str};
use super::codeobj::CodeObj;
use super::constructors::array_t;
use super::typaram::TyParam;
use super::value::ValueObj;
use super::{HasType, Type};
#[derive(Debug)]
pub struct DeserializeError {
pub errno: usize,
pub caused_by: String,
pub desc: String,
}
impl From<std::io::Error> for DeserializeError {
fn from(err: std::io::Error) -> Self {
Self::new(0, "io::Error::into", err.to_string())
}
}
impl From<FromUtf8Error> for DeserializeError {
fn from(err: FromUtf8Error) -> Self {
Self::new(0, "Str::try_from", err.to_string())
}
}
impl From<DeserializeError> for ErrorCore {
fn from(err: DeserializeError) -> Self {
ErrorCore::new(
vec![SubMessage::only_loc(Location::Unknown)],
err.desc,
err.errno,
ErrorKind::ImportError,
Location::Unknown,
)
}
}
impl DeserializeError {
pub fn new<S: Into<String>, T: Into<String>>(errno: usize, caused_by: S, desc: T) -> Self {
Self {
errno,
caused_by: caused_by.into(),
desc: desc.into(),
}
}
pub fn file_broken_error() -> Self {
Self::new(
0,
fn_name!(),
switch_lang!(
"japanese" => "読み込んだ.pycファイルは破損しています",
"simplified_chinese" => "加载的.pyc文件已损坏",
"traditional_chinese" => "加載的.pyc文件已損壞",
"english" => "the loaded .pyc file is broken",
),
)
}
pub fn type_error(expect: &Type, found: &Type) -> Self {
Self::new(
0,
fn_name!(),
switch_lang!(
"japanese" => format!(
"{expect}型オブジェクトを予期しましたが、 読み込んだオブジェクトは{found}型です",
),
"simplified_chinese" => format!(
"期望一个{expect}对象，但反序列化的对象是{found}",
),
"traditional_chinese" => format!(
"期望一個{expect}對象，但反序列化的對像是{found}",
),
"english" => format!(
"expect a {expect} object, but the deserialized object is {found}",
),
),
)
}
}
pub type DeserializeResult<T> = Result<T, DeserializeError>;
#[derive(Default)]
pub struct Deserializer {
str_cache: CacheSet<str>,
arr_cache: CacheSet<[ValueObj]>,
_dict_cache: CacheSet<Dict<ValueObj, ValueObj>>,
}
impl Deserializer {
pub fn new() -> Self {
Self {
str_cache: CacheSet::new(),
arr_cache: CacheSet::new(),
_dict_cache: CacheSet::new(),
}
}
pub fn run(cfg: ErgConfig) -> ExitStatus {
let Input::File(filename) = cfg.input else {
eprintln!("{:?} is not a filename", cfg.input);
return ExitStatus::ERR1;
};
match CodeObj::from_pyc(&filename) {
Ok(codeobj) => {
println!("{}", codeobj.code_info(None));
ExitStatus::OK
}
Err(e) => {
eprintln!(
"failed to deserialize {}: {}",
filename.to_string_lossy(),
e.desc
);
ExitStatus::ERR1
}
}
}
fn get_cached_str(&mut self, s: &str) -> ValueObj {
ValueObj::Str(self.str_cache.get(s))
}
fn get_cached_arr(&mut self, arr: &[ValueObj]) -> ValueObj {
ValueObj::Array(self.arr_cache.get(arr))
}
pub fn vec_to_bytes<const LEN: usize>(vector: Vec<u8>) -> [u8; LEN] {
let mut arr = [0u8; LEN];
for (arr_elem, vec_elem) in arr.iter_mut().zip(vector.iter()) {
*arr_elem = *vec_elem;
}
arr
}
pub fn consume<const LEN: usize>(v: &mut Vec<u8>) -> [u8; LEN] {
Self::vec_to_bytes::<LEN>(v.drain(..LEN).collect::<Vec<_>>())
}
pub fn deserialize_u32(v: &mut Vec<u8>) -> u32 {
u32::from_le_bytes(Self::consume::<4>(v))
}
pub fn deserialize_const(
&mut self,
v: &mut Vec<u8>,
python_ver: PythonVersion,
) -> DeserializeResult<ValueObj> {
match DataTypePrefix::from(v.remove(0)) {
DataTypePrefix::Int32 => {
let bytes = Self::consume::<4>(v);
Ok(ValueObj::Int(i32::from_le_bytes(bytes)))
}
DataTypePrefix::BinFloat => {
let bytes = Self::consume::<8>(v);
Ok(ValueObj::Float(f64::from_le_bytes(bytes)))
}
DataTypePrefix::ShortAscii | DataTypePrefix::ShortAsciiInterned => {
let len = v.remove(0);
let bytes = v.drain(..len as usize).collect();
Ok(self.get_cached_str(&String::from_utf8(bytes)?))
}
DataTypePrefix::Str | DataTypePrefix::Unicode => {
let len = Self::deserialize_u32(v);
let bytes = v.drain(..len as usize).collect();
Ok(self.get_cached_str(&String::from_utf8(bytes)?))
}
DataTypePrefix::True => Ok(ValueObj::Bool(true)),
DataTypePrefix::False => Ok(ValueObj::Bool(false)),
DataTypePrefix::SmallTuple => {
let len = v.remove(0);
let mut arr = Vec::with_capacity(len as usize);
for _ in 0..len {
arr.push(self.deserialize_const(v, python_ver)?);
}
Ok(self.get_cached_arr(&arr))
}
DataTypePrefix::Tuple => {
let len = Self::deserialize_u32(v);
let mut arr = Vec::with_capacity(len as usize);
for _ in 0..len {
arr.push(self.deserialize_const(v, python_ver)?);
}
Ok(self.get_cached_arr(&arr))
}
DataTypePrefix::Code => {
let argcount = Self::deserialize_u32(v);
let posonlyargcount = if python_ver.minor >= Some(8) {
Self::deserialize_u32(v)
} else {
0
};
let kwonlyargcount = Self::deserialize_u32(v);
let nlocals = if python_ver.minor < Some(11) {
Self::deserialize_u32(v)
} else {
0
};
let stacksize = Self::deserialize_u32(v);
let flags = Self::deserialize_u32(v);
let code = self.deserialize_bytes(v)?;
let consts = self.deserialize_const_vec(v, python_ver)?;
let names = self.deserialize_str_vec(v, python_ver)?;
let varnames = self.deserialize_str_vec(v, python_ver)?;
let freevars = self.deserialize_str_vec(v, python_ver)?;
let cellvars = self.deserialize_str_vec(v, python_ver)?;
let filename = self.deserialize_str(v, python_ver)?;
let name = self.deserialize_str(v, python_ver)?;
let qualname = if python_ver.minor >= Some(11) {
self.deserialize_str(v, python_ver)?
} else {
name.clone()
};
let firstlineno = Self::deserialize_u32(v);
let lnotab = self.deserialize_bytes(v)?;
let exceptiontable = if python_ver.minor >= Some(11) {
self.deserialize_bytes(v)?
} else {
vec![]
};
Ok(ValueObj::from(CodeObj {
argcount,
posonlyargcount,
kwonlyargcount,
nlocals,
stacksize,
flags,
code,
consts,
names,
varnames,
freevars,
cellvars,
filename,
name,
qualname,
firstlineno,
lnotab,
exceptiontable,
}))
}
DataTypePrefix::None => Ok(ValueObj::None),
other => Err(DeserializeError::new(
0,
fn_name!(),
switch_lang!(
"japanese" => format!("このオブジェクトは復元できません: {other}"),
"simplified_chinese" => format!("无法反序列化此对象: {other}"),
"traditional_chinese" => format!("無法反序列化此對象: {other}"),
"english" => format!("cannot deserialize this object: {other}"),
),
)),
}
}
pub fn deserialize_const_vec(
&mut self,
v: &mut Vec<u8>,
python_ver: PythonVersion,
) -> DeserializeResult<Vec<ValueObj>> {
match self.deserialize_const(v, python_ver)? {
ValueObj::Array(arr) => Ok(arr.to_vec()),
other => Err(DeserializeError::type_error(&Type::Str, other.ref_t())),
}
}
pub fn deserialize_const_array(
&mut self,
v: &mut Vec<u8>,
python_ver: PythonVersion,
) -> DeserializeResult<RcArray<ValueObj>> {
match self.deserialize_const(v, python_ver)? {
ValueObj::Array(arr) => Ok(arr),
other => Err(DeserializeError::type_error(&Type::Str, other.ref_t())),
}
}
pub fn array_into_const(&mut self, arr: &[ValueObj]) -> ValueObj {
self.get_cached_arr(arr)
}
pub fn try_into_str(&mut self, c: ValueObj) -> DeserializeResult<Str> {
match c {
ValueObj::Str(s) => Ok(s),
other => Err(DeserializeError::type_error(&Type::Str, other.ref_t())),
}
}
pub fn deserialize_str_vec(
&mut self,
v: &mut Vec<u8>,
python_ver: PythonVersion,
) -> DeserializeResult<Vec<Str>> {
match self.deserialize_const(v, python_ver)? {
ValueObj::Array(arr) => {
let mut strs = Vec::with_capacity(arr.len());
for c in arr.iter().cloned() {
strs.push(self.try_into_str(c)?);
}
Ok(strs)
}
other => Err(DeserializeError::type_error(
&array_t(Type::Str, TyParam::erased(Type::Nat)),
other.ref_t(),
)),
}
}
pub fn deserialize_str(
&mut self,
v: &mut Vec<u8>,
python_ver: PythonVersion,
) -> DeserializeResult<Str> {
match self.deserialize_const(v, python_ver)? {
ValueObj::Str(s) => Ok(s),
other => Err(DeserializeError::type_error(&Type::Str, other.ref_t())),
}
}
pub fn deserialize_bytes(&self, v: &mut Vec<u8>) -> DeserializeResult<Vec<u8>> {
if DataTypePrefix::from(v.remove(0)) != DataTypePrefix::Str {
return Err(DeserializeError::new(
0,
fn_name!(),
switch_lang!(
"japanese" => "バイト列の読み込みに失敗しました",
"simplified_chinese" => "未能加载字节",
"traditional_chinese" => "未能加載字節",
"english" => "failed to load bytes",
),
));
}
let len = Self::deserialize_u32(v);
Ok(v.drain(0..len as usize).collect())
}
}