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patch_linecache.py
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81 lines (66 loc) · 2.84 KB
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importlinecache
fromtypingimportAny
classBPythonLinecache(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:None| (list[tuple[int,None,list[str],str]])=None,
*args,
**kwargs,
)->None:
super().__init__(*args,**kwargs)
self.bpython_history=bpython_historyor []
defis_bpython_filename(self,fname:Any)->bool:
returnisinstance(fname,str)andfname.startswith("<bpython-input-")
defget_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])
returnself.bpython_history[idx]
except (IndexError,ValueError):
raiseKeyError
defremember_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)
)
returnfilename
def__getitem__(self,key:Any)->Any:
ifself.is_bpython_filename(key):
returnself.get_bpython_history(key)
returnsuper().__getitem__(key)
def__contains__(self,key:Any)->bool:
ifself.is_bpython_filename(key):
try:
self.get_bpython_history(key)
returnTrue
exceptKeyError:
returnFalse
returnsuper().__contains__(key)
def__delitem__(self,key:Any)->None:
ifnotself.is_bpython_filename(key):
super().__delitem__(key)
def_bpython_clear_linecache()->None:
ifisinstance(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
deffilename_for_console_input(code_string:str)->str:
"""Remembers a string of source code, and returns
a fake filename to use to retrieve it later."""
ifisinstance(linecache.cache,BPythonLinecache):
returnlinecache.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>"