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# CallTips.py - An IDLE extension that provides "Call Tips" - ie, a floating window that
# displays parameter information as you open parens.
import string
import types
class CallTips:
menudefs = [
]
def __init__(self, editwin):
self.editwin = editwin
self.text = editwin.text
self.calltip = None
if hasattr(self.text, "make_calltip_window"):
self._make_calltip_window = self.text.make_calltip_window
else:
self._make_calltip_window = self._make_tk_calltip_window
def close(self):
self._make_calltip_window = None
# Makes a Tk based calltip window. Used by IDLE, but not Pythonwin.
# See __init__ above for how this is used.
def _make_tk_calltip_window(self):
import CallTipWindow
return CallTipWindow.CallTip(self.text)
def _remove_calltip_window(self):
if self.calltip:
self.calltip.hidetip()
self.calltip = None
def paren_open_event(self, event):
self._remove_calltip_window()
arg_text = get_arg_text(self.get_object_at_cursor())
if arg_text:
self.calltip_start = self.text.index("insert")
self.calltip = self._make_calltip_window()
self.calltip.showtip(arg_text)
return "" #so the event is handled normally.
def paren_close_event(self, event):
# Now just hides, but later we should check if other
# paren'd expressions remain open.
self._remove_calltip_window()
return "" #so the event is handled normally.
def check_calltip_cancel_event(self, event):
if self.calltip:
# If we have moved before the start of the calltip,
# or off the calltip line, then cancel the tip.
# (Later need to be smarter about multi-line, etc)
if self.text.compare("insert", "<=", self.calltip_start) or \
self.text.compare("insert", ">", self.calltip_start + " lineend"):
self._remove_calltip_window()
return "" #so the event is handled normally.
def calltip_cancel_event(self, event):
self._remove_calltip_window()
return "" #so the event is handled normally.
def get_object_at_cursor(self,
wordchars="._" + string.ascii_letters + string.digits):
# Usage of ascii_letters is necessary to avoid UnicodeErrors
# if chars contains non-ASCII.
# XXX - This needs to be moved to a better place
# so the "." attribute lookup code can also use it.
text = self.text
chars = text.get("insert linestart", "insert")
i = len(chars)
while i and chars[i-1] in wordchars:
i = i-1
word = chars[i:]
if word:
# How is this for a hack!
import sys, __main__
namespace = sys.modules.copy()
namespace.update(__main__.__dict__)
try:
return eval(word, namespace)
except:
pass
return None # Can't find an object.
def _find_constructor(class_ob):
# Given a class object, return a function object used for the
# constructor (ie, __init__() ) or None if we can't find one.
try:
return class_ob.__init__.im_func
except AttributeError:
for base in class_ob.__bases__:
rc = _find_constructor(base)
if rc is not None: return rc
return None
def get_arg_text(ob):
# Get a string describing the arguments for the given object.
argText = ""
if ob is not None:
argOffset = 0
if type(ob)==types.ClassType:
# Look for the highest __init__ in the class chain.
fob = _find_constructor(ob)
if fob is None:
fob = lambda: None
else:
argOffset = 1
elif type(ob)==types.MethodType:
# bit of a hack for methods - turn it into a function
# but we drop the "self" param.
fob = ob.im_func
argOffset = 1
else:
fob = ob
# Try and build one for Python defined functions
if type(fob) in [types.FunctionType, types.LambdaType]:
try:
realArgs = fob.func_code.co_varnames[argOffset:fob.func_code.co_argcount]
defaults = fob.func_defaults or []
defaults = list(map(lambda name: "=%s" % name, defaults))
defaults = [""] * (len(realArgs)-len(defaults)) + defaults
items = map(lambda arg, dflt: arg+dflt, realArgs, defaults)
if fob.func_code.co_flags & 0x4:
items.append("...")
if fob.func_code.co_flags & 0x8:
items.append("***")
argText = ", ".join(items)
argText = "(%s)" % argText
except:
pass
# See if we can use the docstring
doc = getattr(ob, "__doc__", "")
if doc:
while doc[:1] in " \t\n":
doc = doc[1:]
pos = doc.find("\n")
if pos < 0 or pos > 70:
pos = 70
if argText:
argText += "\n"
argText += doc[:pos]
return argText
#################################################
#
# Test code
#
if __name__=='__main__':
def t1(): "()"
def t2(a, b=None): "(a, b=None)"
def t3(a, *args): "(a, ...)"
def t4(*args): "(...)"
def t5(a, *args): "(a, ...)"
def t6(a, b=None, *args, **kw): "(a, b=None, ..., ***)"
class TC:
"(a=None, ...)"
def __init__(self, a=None, *b): "(a=None, ...)"
def t1(self): "()"
def t2(self, a, b=None): "(a, b=None)"
def t3(self, a, *args): "(a, ...)"
def t4(self, *args): "(...)"
def t5(self, a, *args): "(a, ...)"
def t6(self, a, b=None, *args, **kw): "(a, b=None, ..., ***)"
def test( tests ):
failed=[]
for t in tests:
expected = t.__doc__ + "\n" + t.__doc__
if get_arg_text(t) != expected:
failed.append(t)
print "%s - expected %s, but got %s" % (t, `expected`, `get_arg_text(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)
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