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206 lines
7.1 KiB
206 lines
7.1 KiB
3 years ago
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"""Pop up a reminder of how to call a function.
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Call Tips are floating windows which display function, class, and method
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parameter and docstring information when you type an opening parenthesis, and
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which disappear when you type a closing parenthesis.
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"""
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import __main__
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import inspect
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import re
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import sys
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import textwrap
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import types
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from idlelib import calltip_w
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from idlelib.hyperparser import HyperParser
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class Calltip:
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def __init__(self, editwin=None):
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if editwin is None: # subprocess and test
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self.editwin = None
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else:
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self.editwin = editwin
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self.text = editwin.text
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self.active_calltip = None
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self._calltip_window = self._make_tk_calltip_window
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def close(self):
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self._calltip_window = None
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def _make_tk_calltip_window(self):
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# See __init__ for usage
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return calltip_w.CalltipWindow(self.text)
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def remove_calltip_window(self, event=None):
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if self.active_calltip:
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self.active_calltip.hidetip()
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self.active_calltip = None
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def force_open_calltip_event(self, event):
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"The user selected the menu entry or hotkey, open the tip."
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self.open_calltip(True)
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return "break"
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def try_open_calltip_event(self, event):
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"""Happens when it would be nice to open a calltip, but not really
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necessary, for example after an opening bracket, so function calls
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won't be made.
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"""
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self.open_calltip(False)
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def refresh_calltip_event(self, event):
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if self.active_calltip and self.active_calltip.tipwindow:
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self.open_calltip(False)
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def open_calltip(self, evalfuncs):
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"""Maybe close an existing calltip and maybe open a new calltip.
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Called from (force_open|try_open|refresh)_calltip_event functions.
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"""
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hp = HyperParser(self.editwin, "insert")
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sur_paren = hp.get_surrounding_brackets('(')
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# If not inside parentheses, no calltip.
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if not sur_paren:
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self.remove_calltip_window()
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return
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# If a calltip is shown for the current parentheses, do
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# nothing.
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if self.active_calltip:
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opener_line, opener_col = map(int, sur_paren[0].split('.'))
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if (
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(opener_line, opener_col) ==
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(self.active_calltip.parenline, self.active_calltip.parencol)
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):
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return
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hp.set_index(sur_paren[0])
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try:
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expression = hp.get_expression()
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except ValueError:
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expression = None
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if not expression:
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# No expression before the opening parenthesis, e.g.
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# because it's in a string or the opener for a tuple:
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# Do nothing.
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return
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# At this point, the current index is after an opening
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# parenthesis, in a section of code, preceded by a valid
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# expression. If there is a calltip shown, it's not for the
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# same index and should be closed.
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self.remove_calltip_window()
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# Simple, fast heuristic: If the preceding expression includes
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# an opening parenthesis, it likely includes a function call.
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if not evalfuncs and (expression.find('(') != -1):
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return
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argspec = self.fetch_tip(expression)
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if not argspec:
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return
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self.active_calltip = self._calltip_window()
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self.active_calltip.showtip(argspec, sur_paren[0], sur_paren[1])
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def fetch_tip(self, expression):
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"""Return the argument list and docstring of a function or class.
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If there is a Python subprocess, get the calltip there. Otherwise,
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either this fetch_tip() is running in the subprocess or it was
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called in an IDLE running without the subprocess.
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The subprocess environment is that of the most recently run script. If
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two unrelated modules are being edited some calltips in the current
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module may be inoperative if the module was not the last to run.
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To find methods, fetch_tip must be fed a fully qualified name.
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"""
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try:
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rpcclt = self.editwin.flist.pyshell.interp.rpcclt
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except AttributeError:
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rpcclt = None
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if rpcclt:
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return rpcclt.remotecall("exec", "get_the_calltip",
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(expression,), {})
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else:
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return get_argspec(get_entity(expression))
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def get_entity(expression):
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"""Return the object corresponding to expression evaluated
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in a namespace spanning sys.modules and __main.dict__.
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"""
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if expression:
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namespace = {**sys.modules, **__main__.__dict__}
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try:
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return eval(expression, namespace) # Only protect user code.
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except BaseException:
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# An uncaught exception closes idle, and eval can raise any
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# exception, especially if user classes are involved.
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return None
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# The following are used in get_argspec and some in tests
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_MAX_COLS = 85
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_MAX_LINES = 5 # enough for bytes
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_INDENT = ' '*4 # for wrapped signatures
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_first_param = re.compile(r'(?<=\()\w*\,?\s*')
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_default_callable_argspec = "See source or doc"
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_invalid_method = "invalid method signature"
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def get_argspec(ob):
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'''Return a string describing the signature of a callable object, or ''.
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For Python-coded functions and methods, the first line is introspected.
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Delete 'self' parameter for classes (.__init__) and bound methods.
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The next lines are the first lines of the doc string up to the first
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empty line or _MAX_LINES. For builtins, this typically includes
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the arguments in addition to the return value.
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'''
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# Determine function object fob to inspect.
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try:
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ob_call = ob.__call__
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except BaseException: # Buggy user object could raise anything.
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return '' # No popup for non-callables.
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# For Get_argspecTest.test_buggy_getattr_class, CallA() & CallB().
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fob = ob_call if isinstance(ob_call, types.MethodType) else ob
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# Initialize argspec and wrap it to get lines.
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try:
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argspec = str(inspect.signature(fob))
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except Exception as err:
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msg = str(err)
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if msg.startswith(_invalid_method):
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return _invalid_method
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else:
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argspec = ''
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if isinstance(fob, type) and argspec == '()':
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# If fob has no argument, use default callable argspec.
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argspec = _default_callable_argspec
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lines = (textwrap.wrap(argspec, _MAX_COLS, subsequent_indent=_INDENT)
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if len(argspec) > _MAX_COLS else [argspec] if argspec else [])
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# Augment lines from docstring, if any, and join to get argspec.
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doc = inspect.getdoc(ob)
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if doc:
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for line in doc.split('\n', _MAX_LINES)[:_MAX_LINES]:
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line = line.strip()
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if not line:
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break
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if len(line) > _MAX_COLS:
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line = line[: _MAX_COLS - 3] + '...'
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lines.append(line)
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argspec = '\n'.join(lines)
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return argspec or _default_callable_argspec
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if __name__ == '__main__':
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from unittest import main
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main('idlelib.idle_test.test_calltip', verbosity=2)
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