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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.
-
- Future plans include extending the functionality to include class attributes.
-
- """
- import sys
- import string
- import types
-
- import CallTipWindow
-
- import __main__
-
- class CallTips:
-
- menudefs = [
- ]
-
- def __init__(self, editwin=None):
- if editwin == None: # subprocess and test
- self.editwin = None
- return
- self.editwin = editwin
- self.text = editwin.text
- self.calltip = None
- self._make_calltip_window = self._make_tk_calltip_window
-
- def close(self):
- self._make_calltip_window = None
-
- def _make_tk_calltip_window(self):
- # See __init__ for usage
- 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()
- name = self.get_name_at_cursor()
- arg_text = self.fetch_tip(name)
- 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.
-
- __IDCHARS = "._" + string.ascii_letters + string.digits
-
- def get_name_at_cursor(self):
- idchars = self.__IDCHARS
- str = self.text.get("insert linestart", "insert")
- i = len(str)
- while i and str[i-1] in idchars:
- i -= 1
- return str[i:]
-
- 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 fetch_tip() is running in the subprocess itself or it was called
- in an IDLE EditorWindow before any script had been run.
-
- 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.
-
- """
- 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_arg_text(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:
- return None
-
- 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:
- doc = doc.lstrip()
- 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):
- ct = CallTips()
- failed=[]
- for t in tests:
- expected = t.__doc__ + "\n" + t.__doc__
- name = t.__name__
- arg_text = ct.fetch_tip(name)
- if arg_text != expected:
- failed.append(t)
- print "%s - expected %s, but got %s" % (t, expected,
- get_arg_text(entity))
- 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)
-