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"""CallTips.py - An IDLE Extension to Jog Your Memory
Call Tips are floating windows which display function, class, and method
parameter and docstring information when you type an opening parenthesis, and
which disappear when you type a closing parenthesis.
"""
import re
import sys
import types
import inspect
from idlelib import CallTipWindow
from idlelib.HyperParser import HyperParser
import __main__
class CallTips:
menudefs = [
('edit', [
("Show call tip", "<<force-open-calltip>>"),
])
]
def __init__(self, editwin=None):
if editwin is None: # subprocess and test
self.editwin = None
else:
self.editwin = editwin
self.text = editwin.text
self.active_calltip = None
self._calltip_window = self._make_tk_calltip_window
def close(self):
self._calltip_window = None
def _make_tk_calltip_window(self):
# See __init__ for usage
return CallTipWindow.CallTip(self.text)
def _remove_calltip_window(self, event=None):
if self.active_calltip:
self.active_calltip.hidetip()
self.active_calltip = None
def force_open_calltip_event(self, event):
"The user selected the menu entry or hotkey, open the tip."
self.open_calltip(True)
def try_open_calltip_event(self, event):
"""Happens when it would be nice to open a CallTip, but not really
necessary, for example after an opening bracket, so function calls
won't be made.
"""
self.open_calltip(False)
def refresh_calltip_event(self, event):
if self.active_calltip and self.active_calltip.is_active():
self.open_calltip(False)
def open_calltip(self, evalfuncs):
self._remove_calltip_window()
hp = HyperParser(self.editwin, "insert")
sur_paren = hp.get_surrounding_brackets('(')
if not sur_paren:
return
hp.set_index(sur_paren[0])
name = hp.get_expression()
if not name:
return
if not evalfuncs and (name.find('(') != -1):
return
argspec = self.fetch_tip(name)
if not argspec:
return
self.active_calltip = self._calltip_window()
self.active_calltip.showtip(argspec, sur_paren[0], sur_paren[1])
def fetch_tip(self, name):
"""Return the argument list and docstring of a function or class.
If there is a Python subprocess, get the calltip there. Otherwise,
either this fetch_tip() is running in the subprocess or it was
called in an IDLE running without the subprocess.
The subprocess environment is that of the most recently run script. If
two unrelated modules are being edited some calltips in the current
module may be inoperative if the module was not the last to run.
To find methods, fetch_tip must be fed a fully qualified name.
"""
try:
rpcclt = self.editwin.flist.pyshell.interp.rpcclt
except:
rpcclt = None
if rpcclt:
return rpcclt.remotecall("exec", "get_the_calltip",
(name,), {})
else:
entity = self.get_entity(name)
return get_argspec(entity)
def get_entity(self, name):
"Lookup name in a namespace spanning sys.modules and __main.dict__."
if name:
namespace = sys.modules.copy()
namespace.update(__main__.__dict__)
try:
return eval(name, namespace)
except (NameError, AttributeError):
return None
def _find_constructor(class_ob):
"Find the nearest __init__() in the class tree."
try:
return class_ob.__init__.im_func
except AttributeError:
for base in class_ob.__bases__:
init = _find_constructor(base)
if init:
return init
return None
def get_argspec(ob):
"""Get a string describing the arguments for the given object."""
argspec = ""
if ob is not None:
if isinstance(ob, type):
fob = _find_constructor(ob)
if fob is None:
fob = lambda: None
elif isinstance(ob, types.MethodType):
fob = ob.im_func
else:
fob = ob
if isinstance(fob, (types.FunctionType, types.LambdaType)):
argspec = inspect.formatargspec(*inspect.getfullargspec(fob))
pat = re.compile('self\,?\s*')
argspec = pat.sub("", argspec)
doc = getattr(ob, "__doc__", "")
if doc:
doc = doc.lstrip()
pos = doc.find("\n")
if pos < 0 or pos > 70:
pos = 70
if argspec:
argspec += "\n"
argspec += doc[:pos]
return argspec
#################################################
#
# Test code
#
def main():
def t1(): "()"
def t2(a, b=None): "(a, b=None)"
def t3(a, *args): "(a, *args)"
def t4(*args): "(*args)"
def t5(a, *args): "(a, *args)"
def t6(a, b=None, *args, **kw): "(a, b=None, *args, **kw)"
class TC(object):
"(ai=None, *b)"
def __init__(self, ai=None, *b): "(ai=None, *b)"
def t1(self): "()"
def t2(self, ai, b=None): "(ai, b=None)"
def t3(self, ai, *args): "(ai, *args)"
def t4(self, *args): "(*args)"
def t5(self, ai, *args): "(ai, *args)"
def t6(self, ai, b=None, *args, **kw): "(ai, b=None, *args, **kw)"
__main__.__dict__.update(locals())
def test(tests):
ct = CallTips()
failed=[]
for t in tests:
expected = t.__doc__ + "\n" + t.__doc__
name = t.__name__
# exercise fetch_tip(), not just get_argspec()
try:
qualified_name = "%s.%s" % (t.im_class.__name__, name)
except AttributeError:
qualified_name = name
argspec = ct.fetch_tip(qualified_name)
if argspec != expected:
failed.append(t)
fmt = "%s - expected %s, but got %s"
print(fmt % (t.__name__, expected, get_argspec(t)))
print("%d of %d tests failed" % (len(failed), len(tests)))
tc = TC()
tests = (t1, t2, t3, t4, t5, t6,
TC, tc.t1, tc.t2, tc.t3, tc.t4, tc.t5, tc.t6)
test(tests)
if __name__ == '__main__':
main()
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