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import ast

import contextlib

import io

import json

import sys

import traceback

import uuid

from pathlib import Path

from typing import Dict, List, Optional, Union

STDIN = sys.stdin

STDOUT = sys.stdout

STDERR = sys.stderr

USER_GLOBALS = {}

def _send_message(msg: str):

# Content-Length is the data size in bytes.

length_msg = len(msg.encode())

STDOUT.buffer.write(f"Content-Length: {length_msg}\r\n\r\n{msg}".encode())

STDOUT.buffer.flush()

def send_message(**kwargs):

_send_message(json.dumps({"jsonrpc": "2.0", **kwargs}))

def print_log(msg: str):

send_message(method="log", params=msg)

def send_response(

response: str,

response_id: int,

execution_status: bool = True, # noqa: FBT001, FBT002

):

send_message(

id=response_id,

result={"status": execution_status, "output": response},

)

def send_request(params: Optional[Union[List, Dict]] = None):

request_id = uuid.uuid4().hex

if params is None:

send_message(id=request_id, method="input")

else:

send_message(id=request_id, method="input", params=params)

return request_id

original_input = input

def custom_input(prompt=""):

try:

send_request({"prompt": prompt})

headers = get_headers()

# Content-Length is the data size in bytes.

content_length = int(headers.get("Content-Length", 0))

if content_length:

message_text = STDIN.buffer.read(content_length).decode()

message_json = json.loads(message_text)

return message_json["result"]["userInput"]

except EOFError:

# Input stream closed, exit gracefully

sys.exit(0)

except Exception:

print_log(traceback.format_exc())

# Set input to our custom input

USER_GLOBALS["input"] = custom_input

input = custom_input # noqa: A001

def handle_response(request_id):

while True:

try:

headers = get_headers()

# Content-Length is the data size in bytes.

content_length = int(headers.get("Content-Length", 0))

if content_length:

message_text = STDIN.buffer.read(content_length).decode()

message_json = json.loads(message_text)

our_user_input = message_json["result"]["userInput"]

if message_json["id"] == request_id:

send_response(our_user_input, message_json["id"])

elif message_json["method"] == "exit":

sys.exit(0)

except EOFError: # noqa: PERF203

# Input stream closed, exit gracefully

sys.exit(0)

except Exception:

print_log(traceback.format_exc())

def exec_function(user_input):

try:

compile(user_input, "<stdin>", "eval")

except SyntaxError:

return exec

return eval

def check_valid_command(request):

try:

user_input = request["params"]

ast.parse(user_input[0])

send_response("True", request["id"])

except SyntaxError:

send_response("False", request["id"])

def execute(request, user_globals):

str_output = CustomIO("<stdout>", encoding="utf-8")

str_error = CustomIO("<stderr>", encoding="utf-8")

str_input = CustomIO("<stdin>", encoding="utf-8", newline="\n")

with contextlib.redirect_stdout(str_output), contextlib.redirect_stderr(str_error):

original_stdin = sys.stdin

try:

sys.stdin = str_input

execution_status = exec_user_input(request["params"], user_globals)

finally:

sys.stdin = original_stdin

send_response(str_output.get_value(), request["id"], execution_status)

def exec_user_input(user_input, user_globals) -> bool:

user_input = user_input[0] if isinstance(user_input, list) else user_input

try:

callable_ = exec_function(user_input)

retval = callable_(user_input, user_globals)

if retval is not None:

print(retval)

return True

except KeyboardInterrupt:

print(traceback.format_exc())

return False

except Exception:

print(traceback.format_exc())

return False

class CustomIO(io.TextIOWrapper):

"""Custom stream object to replace stdio."""

def __init__(self, name, encoding="utf-8", newline=None):

self._buffer = io.BytesIO()

self._custom_name = name

super().__init__(self._buffer, encoding=encoding, newline=newline)

def close(self):

"""Provide this close method which is used by some tools."""

# This is intentionally empty.

def get_value(self) -> str:

"""Returns value from the buffer as string."""

self.seek(0)

return self.read()

def get_headers():

headers = {}

while True:

raw = STDIN.buffer.readline()

# Detect EOF: readline() returns empty bytes when input stream is closed

if raw == b"":

raise EOFError("EOF reached while reading headers")

line = raw.decode().strip()

if not line:

break

name, value = line.split(":", 1)

headers[name] = value.strip()

return headers

if __name__ == "__main__":

# https://docs.python.org/3/tutorial/modules.html#the-module-search-path

# The directory containing the input script (or the current directory when no file is specified).

# Here we emulate the same behavior like no file is specified.

input_script_dir = Path(__file__).parent

script_dir_str = str(input_script_dir)

if script_dir_str in sys.path:

sys.path.remove(script_dir_str)

while "" in sys.path:

sys.path.remove("")

sys.path.insert(0, "")

while True:

try:

headers = get_headers()

# Content-Length is the data size in bytes.

content_length = int(headers.get("Content-Length", 0))

if content_length:

request_text = STDIN.buffer.read(content_length).decode()

request_json = json.loads(request_text)

if request_json["method"] == "execute":

execute(request_json, USER_GLOBALS)

if request_json["method"] == "check_valid_command":

check_valid_command(request_json)

elif request_json["method"] == "exit":

sys.exit(0)

except EOFError: # noqa: PERF203

# Input stream closed (VS Code terminated), exit gracefully

sys.exit(0)

except Exception:

print_log(traceback.format_exc())