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filter_stdout.py
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47 lines (37 loc) · 1.2 KB
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from __future__ import annotations
import contextlib
import io
import re
import sys
from re import Pattern
from typing import TYPE_CHECKING, TextIO
if TYPE_CHECKING:
from collections.abc import Generator
class FilterStdOutput:
"""Filter out stdout/sterr given a regex pattern."""
def __init__(self, stream: TextIO, re_pattern: str | Pattern) -> None:
self.stream = stream
self.pattern = (
re.compile(re_pattern) if isinstance(re_pattern, str) else re_pattern
)
self.triggered = False
def __getattr__(self, attr_name: str) -> object:
return getattr(self.stream, attr_name)
def write(self, data: str) -> None:
if data == "\n" and self.triggered:
self.triggered = False
else:
if self.pattern.search(data) is None:
self.stream.write(data)
self.stream.flush()
else:
# caught bad pattern
self.triggered = True
def flush(self) -> None:
self.stream.flush()
@contextlib.contextmanager
def nostdout() -> Generator[None, None, None]:
save_stdout = sys.stdout
sys.stdout = io.StringIO()
yield
sys.stdout = save_stdout