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"""Pop up a reminder of how to call a function.

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 inspect

import re

import sys

import textwrap

import types

from idlelib import calltip_w

from idlelib.hyperparser import HyperParser

class Calltip:

def __init__(self, editwin=None):

if editwin is None: # subprocess and test

self.editwin = None

else:

self.editwin = editwin

self.text = editwin.text

self.active_calltip = None

self._calltip_window = self._make_tk_calltip_window

def close(self):

self._calltip_window = None

def _make_tk_calltip_window(self):

# See __init__ for usage

return calltip_w.CalltipWindow(self.text)

def remove_calltip_window(self, event=None):

if self.active_calltip:

self.active_calltip.hidetip()

self.active_calltip = None

def force_open_calltip_event(self, event):

"The user selected the menu entry or hotkey, open the tip."

self.open_calltip(True)

return "break"

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 self.active_calltip and self.active_calltip.tipwindow:

self.open_calltip(False)

def open_calltip(self, evalfuncs):

"""Maybe close an existing calltip and maybe open a new calltip.

Called from (force_open|try_open|refresh)_calltip_event functions.

"""

hp = HyperParser(self.editwin, "insert")

sur_paren = hp.get_surrounding_brackets('(')

# If not inside parentheses, no calltip.

if not sur_paren:

self.remove_calltip_window()

return

# If a calltip is shown for the current parentheses, do

# nothing.

if self.active_calltip:

opener_line, opener_col = map(int, sur_paren[0].split('.'))

if (

(opener_line, opener_col) ==

(self.active_calltip.parenline, self.active_calltip.parencol)

return

hp.set_index(sur_paren[0])

try:

expression = hp.get_expression()

except ValueError:

expression = None

if not expression:

# No expression before the opening parenthesis, e.g.

# because it's in a string or the opener for a tuple:

# Do nothing.

return

# At this point, the current index is after an opening

# parenthesis, in a section of code, preceded by a valid

# expression. If there is a calltip shown, it's not for the

# same index and should be closed.

self.remove_calltip_window()

# Simple, fast heuristic: If the preceding expression includes

# an opening parenthesis, it likely includes a function call.

if not evalfuncs and (expression.find('(') != -1):

return

argspec = self.fetch_tip(expression)

if not argspec:

return

self.active_calltip = self._calltip_window()

self.active_calltip.showtip(argspec, 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 this fetch_tip() is running in the subprocess or it was

called in an IDLE running without the subprocess.

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:

return get_argspec(get_entity(expression))

def get_entity(expression):

"""Return the object corresponding to expression evaluated

in a namespace spanning sys.modules and __main.dict__.

"""

if expression:

namespace = {**sys.modules, **__main__.__dict__}

try:

return eval(expression, namespace) # Only protect user code.

except BaseException:

# An uncaught exception closes idle, and eval can raise any

# exception, especially if user classes are involved.

return None

# The following are used in get_argspec and some in tests

_MAX_COLS = 85

_MAX_LINES = 5 # enough for bytes

_INDENT = ' '*4 # for wrapped signatures

_first_param = re.compile(r'(?<=\()\w*\,?\s*')

_default_callable_argspec = "See source or doc"

_invalid_method = "invalid method signature"

def get_argspec(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.

'''

# Determine function object fob to inspect.

try:

ob_call = ob.__call__

except BaseException: # Buggy user object could raise anything.

return '' # No popup for non-callables.

# For Get_argspecTest.test_buggy_getattr_class, CallA() & CallB().

fob = ob_call if isinstance(ob_call, types.MethodType) else ob

# Initialize argspec and wrap it to get lines.

try:

argspec = str(inspect.signature(fob))

except Exception as err:

msg = str(err)

if msg.startswith(_invalid_method):

return _invalid_method

else:

argspec = ''

if isinstance(fob, type) and argspec == '()':

# If fob has no argument, use default callable argspec.

argspec = _default_callable_argspec

lines = (textwrap.wrap(argspec, _MAX_COLS, subsequent_indent=_INDENT)

if len(argspec) > _MAX_COLS else [argspec] if argspec else [])

# Augment lines from docstring, if any, and join to get argspec.

doc = inspect.getdoc(ob)

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 or _default_callable_argspec

if __name__ == '__main__':

from unittest import main

main('idlelib.idle_test.test_calltip', verbosity=2)

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