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