mirror of https://github.com/python/cpython
227 lines
7.8 KiB
Python
227 lines
7.8 KiB
Python
"""CallTips.py - An IDLE Extension to Jog Your Memory
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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 re
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import sys
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import types
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from idlelib import CallTipWindow
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from idlelib.HyperParser import HyperParser
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import __main__
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class CallTips:
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menudefs = [
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('edit', [
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("Show call tip", "<<force-open-calltip>>"),
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])
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]
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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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return
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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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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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def _make_tk_calltip_window(self):
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# See __init__ for usage
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return CallTipWindow.CallTip(self.text)
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def _remove_calltip_window(self, event=None):
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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 force_open_calltip_event(self, event):
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"""Happens when the user really wants to open a CallTip, even if a
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function call is needed.
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"""
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self.open_calltip(True)
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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 there is already a calltip window, check if it is still needed,
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and if so, reload it.
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"""
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if self.calltip and self.calltip.is_active():
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self.open_calltip(False)
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def open_calltip(self, evalfuncs):
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self._remove_calltip_window()
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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 sur_paren:
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return
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hp.set_index(sur_paren[0])
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expression = hp.get_expression()
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if not expression or (not evalfuncs and expression.find('(') != -1):
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return
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arg_text = self.fetch_tip(expression)
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if not arg_text:
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return
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self.calltip = self._make_calltip_window()
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self.calltip.showtip(arg_text, 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 fetch_tip() is running in the subprocess itself or it was called
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in an IDLE EditorWindow before any script had been run.
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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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entity = self.get_entity(expression)
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return get_arg_text(entity)
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def get_entity(self, 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.copy()
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namespace.update(__main__.__dict__)
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try:
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return eval(expression, namespace)
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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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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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only if it is callable."""
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arg_text = ""
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if ob is not None and hasattr(ob, '__call__'):
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arg_offset = 0
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if type(ob) in (types.ClassType, types.TypeType):
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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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arg_offset = 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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arg_offset = 1
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else:
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fob = ob
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# Try to build one for Python defined functions
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if type(fob) in [types.FunctionType, types.LambdaType]:
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argcount = fob.func_code.co_argcount
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real_args = fob.func_code.co_varnames[arg_offset:argcount]
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defaults = fob.func_defaults or []
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defaults = list(map(lambda name: "=%s" % repr(name), defaults))
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defaults = [""] * (len(real_args) - len(defaults)) + defaults
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items = map(lambda arg, dflt: arg + dflt, real_args, 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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arg_text = ", ".join(items)
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arg_text = "(%s)" % re.sub("\.\d+", "<tuple>", arg_text)
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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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doc = doc.lstrip()
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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 arg_text:
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arg_text += "\n"
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arg_text += doc[:pos]
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return arg_text
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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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def t7((a, b), c, (d, e)): "(<tuple>, c, <tuple>)"
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class TC(object):
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"(ai=None, ...)"
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def __init__(self, ai=None, *b): "(ai=None, ...)"
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def t1(self): "()"
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def t2(self, ai, b=None): "(ai, b=None)"
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def t3(self, ai, *args): "(ai, ...)"
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def t4(self, *args): "(...)"
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def t5(self, ai, *args): "(ai, ...)"
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def t6(self, ai, b=None, *args, **kw): "(ai, b=None, ..., ***)"
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def t7(self, (ai, b), c, (d, e)): "(<tuple>, c, <tuple>)"
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def test(tests):
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ct = CallTips()
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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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name = t.__name__
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# exercise fetch_tip(), not just get_arg_text()
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try:
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qualified_name = "%s.%s" % (t.im_class.__name__, name)
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except AttributeError:
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qualified_name = name
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arg_text = ct.fetch_tip(qualified_name)
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if arg_text != expected:
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failed.append(t)
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fmt = "%s - expected %s, but got %s"
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print fmt % (t.__name__, 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, t7,
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TC, tc.t1, tc.t2, tc.t3, tc.t4, tc.t5, tc.t6, tc.t7)
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test(tests)
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