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Copy pathpatch_linecache.py
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83 lines (68 loc) · 2.89 KB
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import linecache
from typing import Any, List, Tuple, Optional
class BPythonLinecache(dict):
"""Replaces the cache dict in the standard-library linecache module,
to also remember (in an unerasable way) bpython console input."""
def __init__(
self,
bpython_history: Optional[
List[Tuple[int, None, List[str], str]]
] = None,
*args,
**kwargs,
) -> None:
super().__init__(*args, **kwargs)
self.bpython_history = bpython_history or []
def is_bpython_filename(self, fname: Any) -> bool:
return isinstance(fname, str) and fname.startswith("<bpython-input-")
def get_bpython_history(self, key: str) -> Tuple[int, None, List[str], str]:
"""Given a filename provided by remember_bpython_input,
returns the associated source string."""
try:
idx = int(key.split("-")[2][:-1])
return self.bpython_history[idx]
except (IndexError, ValueError):
raise KeyError
def remember_bpython_input(self, source: str) -> str:
"""Remembers a string of source code, and returns
a fake filename to use to retrieve it later."""
filename = f"<bpython-input-{len(self.bpython_history)}>"
self.bpython_history.append(
(len(source), None, source.splitlines(True), filename)
)
return filename
def __getitem__(self, key: Any) -> Any:
if self.is_bpython_filename(key):
return self.get_bpython_history(key)
return super().__getitem__(key)
def __contains__(self, key: Any) -> bool:
if self.is_bpython_filename(key):
try:
self.get_bpython_history(key)
return True
except KeyError:
return False
return super().__contains__(key)
def __delitem__(self, key: Any) -> None:
if not self.is_bpython_filename(key):
super().__delitem__(key)
def _bpython_clear_linecache() -> None:
if isinstance(linecache.cache, BPythonLinecache):
bpython_history = linecache.cache.bpython_history
else:
bpython_history = None
linecache.cache = BPythonLinecache(bpython_history)
# Monkey-patch the linecache module so that we are able
# to hold our command history there and have it persist
linecache.cache = BPythonLinecache(None, linecache.cache) # type: ignore
linecache.clearcache = _bpython_clear_linecache
def filename_for_console_input(code_string: str) -> str:
"""Remembers a string of source code, and returns
a fake filename to use to retrieve it later."""
if isinstance(linecache.cache, BPythonLinecache):
return linecache.cache.remember_bpython_input(code_string)
else:
# If someone else has patched linecache.cache, better for code to
# simply be unavailable to inspect.getsource() than to raise
# an exception.
return "<input>"