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python2.7
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idlelib
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CallTips.py
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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 __main__ import re import sys import textwrap import types from idlelib import CallTipWindow from idlelib.HyperParser import HyperParser 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 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, event=None): if self.calltip: self.calltip.hidetip() self.calltip = None def force_open_calltip_event(self, event): """Happens when the user really wants to open a CallTip, even if a function call is needed. """ 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 there is already a calltip window, check if it is still needed, and if so, reload it. """ if self.calltip and self.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]) expression = hp.get_expression() if not expression or (not evalfuncs and expression.find('(') != -1): return arg_text = self.fetch_tip(expression) if not arg_text: return self.calltip = self._make_calltip_window() self.calltip.showtip(arg_text, sur_paren[0], sur_paren[1]) def fetch_tip(self, expression): """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. To find methods, fetch_tip must be fed a fully qualified name. """ try: rpcclt = self.editwin.flist.pyshell.interp.rpcclt except AttributeError: rpcclt = None if rpcclt: return rpcclt.remotecall("exec", "get_the_calltip", (expression,), {}) else: entity = self.get_entity(expression) return get_arg_text(entity) def get_entity(self, expression): """Return the object corresponding to expression evaluated in a namespace spanning sys.modules and __main.dict__. """ if expression: namespace = sys.modules.copy() namespace.update(__main__.__dict__) try: return eval(expression, namespace) except BaseException: # An uncaught exception closes idle, and eval can raise any # exception, especially if user classes are involved. 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 # The following are used in get_arg_text _MAX_COLS = 85 _MAX_LINES = 5 # enough for bytes _INDENT = ' '*4 # for wrapped signatures def get_arg_text(ob): '''Return a string describing the signature of a callable object, or ''. For Python-coded functions and methods, the first line is introspected. Delete 'self' parameter for classes (.__init__) and bound methods. The next lines are the first lines of the doc string up to the first empty line or _MAX_LINES. For builtins, this typically includes the arguments in addition to the return value. ''' argspec = "" try: ob_call = ob.__call__ except BaseException: if type(ob) is types.ClassType: # old-style ob_call = ob else: return argspec arg_offset = 0 if type(ob) in (types.ClassType, types.TypeType): # Look for the first __init__ in the class chain with .im_func. # Slot wrappers (builtins, classes defined in funcs) do not. fob = _find_constructor(ob) if fob is None: fob = lambda: None else: arg_offset = 1 elif type(ob) == types.MethodType: # bit of a hack for methods - turn it into a function # and drop the "self" param for bound methods fob = ob.im_func if ob.im_self is not None: arg_offset = 1 elif type(ob_call) == types.MethodType: # a callable class instance fob = ob_call.im_func arg_offset = 1 else: fob = ob # Try to build one for Python defined functions if type(fob) in [types.FunctionType, types.LambdaType]: argcount = fob.func_code.co_argcount real_args = fob.func_code.co_varnames[arg_offset:argcount] defaults = fob.func_defaults or [] defaults = list(map(lambda name: "=%s" % repr(name), defaults)) defaults = [""] * (len(real_args) - len(defaults)) + defaults items = map(lambda arg, dflt: arg + dflt, real_args, defaults) for flag, pre, name in ((0x4, '*', 'args'), (0x8, '**', 'kwargs')): if fob.func_code.co_flags & flag: pre_name = pre + name if name not in real_args: items.append(pre_name) else: i = 1 while ((name+'%s') % i) in real_args: i += 1 items.append((pre_name+'%s') % i) argspec = ", ".join(items) argspec = "(%s)" % re.sub("(?<!\d)\.\d+", "<tuple>", argspec) lines = (textwrap.wrap(argspec, _MAX_COLS, subsequent_indent=_INDENT) if len(argspec) > _MAX_COLS else [argspec] if argspec else []) if isinstance(ob_call, types.MethodType): doc = ob_call.__doc__ else: doc = getattr(ob, "__doc__", "") if doc: for line in doc.split('\n', _MAX_LINES)[:_MAX_LINES]: line = line.strip() if not line: break if len(line) > _MAX_COLS: line = line[: _MAX_COLS - 3] + '...' lines.append(line) argspec = '\n'.join(lines) return argspec if __name__ == '__main__': from unittest import main main('idlelib.idle_test.test_calltips', verbosity=2)