| """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) |
