"""Complete either attribute names or file names.

Either on demand or after a user-selected delay after a key character,
pop up a list of candidates.
"""
import __main__
import os
import string
import sys

# These constants represent the two different types of completions.
# They must be defined here so autocomple_w can import them.
COMPLETE_ATTRIBUTES, COMPLETE_FILES = range(1, 2+1)

from idlelib import autocomplete_w
from idlelib.config import idleConf
from idlelib.hyperparser import HyperParser

# This string includes all chars that may be in an identifier.
# TODO Update this here and elsewhere.
ID_CHARS = string.ascii_letters + string.digits + "_"

SEPS = os.sep
if os.altsep: # e.g. '/' on Windows...
 SEPS += os.altsep


class AutoComplete:

 def __init__(self, editwin=None):
 self.editwin = editwin
 if editwin is not None: # not in subprocess or test
 self.text = editwin.text
 self.autocompletewindow = None
 # id of delayed call, and the index of the text insert when
 # the delayed call was issued. If _delayed_completion_id is
 # None, there is no delayed call.
 self._delayed_completion_id = None
 self._delayed_completion_index = None

 @classmethod
 def reload(cls):
 cls.popupwait = idleConf.GetOption(
 "extensions", "AutoComplete", "popupwait", type="int", default=0)

 def _make_autocomplete_window(self):
 return autocomplete_w.AutoCompleteWindow(self.text)

 def _remove_autocomplete_window(self, event=None):
 if self.autocompletewindow:
 self.autocompletewindow.hide_window()
 self.autocompletewindow = None

 def force_open_completions_event(self, event):
 """Happens when the user really wants to open a completion list, even
 if a function call is needed.
 """
 self.open_completions(True, False, True)
 return "break"

 def try_open_completions_event(self, event):
 """Happens when it would be nice to open a completion list, but not
 really necessary, for example after a dot, so function
 calls won't be made.
 """
 lastchar = self.text.get("insert-1c")
 if lastchar == ".":
 self._open_completions_later(False, False, False,
 COMPLETE_ATTRIBUTES)
 elif lastchar in SEPS:
 self._open_completions_later(False, False, False,
 COMPLETE_FILES)

 def autocomplete_event(self, event):
 """Happens when the user wants to complete his word, and if necessary,
 open a completion list after that (if there is more than one
 completion)
 """
 if hasattr(event, "mc_state") and event.mc_state or\
 not self.text.get("insert linestart", "insert").strip():
 # A modifier was pressed along with the tab or
 # there is only previous whitespace on this line, so tab.
 return None
 if self.autocompletewindow and self.autocompletewindow.is_active():
 self.autocompletewindow.complete()
 return "break"
 else:
 opened = self.open_completions(False, True, True)
 return "break" if opened else None

 def _open_completions_later(self, *args):
 self._delayed_completion_index = self.text.index("insert")
 if self._delayed_completion_id is not None:
 self.text.after_cancel(self._delayed_completion_id)
 self._delayed_completion_id = \
 self.text.after(self.popupwait, self._delayed_open_completions,
 *args)

 def _delayed_open_completions(self, *args):
 self._delayed_completion_id = None
 if self.text.index("insert") == self._delayed_completion_index:
 self.open_completions(*args)

 def open_completions(self, evalfuncs, complete, userWantsWin, mode=None):
 """Find the completions and create the AutoCompleteWindow.
 Return True if successful (no syntax error or so found).
 If complete is True, then if there's nothing to complete and no
 start of completion, won't open completions and return False.
 If mode is given, will open a completion list only in this mode.

 Action Function Eval Complete WantWin Mode
 ^space force_open_completions True, False, True no
 . or / try_open_completions False, False, False yes
 tab autocomplete False, True, True no
 """
 # Cancel another delayed call, if it exists.
 if self._delayed_completion_id is not None:
 self.text.after_cancel(self._delayed_completion_id)
 self._delayed_completion_id = None

 hp = HyperParser(self.editwin, "insert")
 curline = self.text.get("insert linestart", "insert")
 i = j = len(curline)
 if hp.is_in_string() and (not mode or mode==COMPLETE_FILES):
 # Find the beginning of the string.
 # fetch_completions will look at the file system to determine
 # whether the string value constitutes an actual file name
 # XXX could consider raw strings here and unescape the string
 # value if it's not raw.
 self._remove_autocomplete_window()
 mode = COMPLETE_FILES
 # Find last separator or string start
 while i and curline[i-1] not in "'\"" + SEPS:
 i -= 1
 comp_start = curline[i:j]
 j = i
 # Find string start
 while i and curline[i-1] not in "'\"":
 i -= 1
 comp_what = curline[i:j]
 elif hp.is_in_code() and (not mode or mode==COMPLETE_ATTRIBUTES):
 self._remove_autocomplete_window()
 mode = COMPLETE_ATTRIBUTES
 while i and (curline[i-1] in ID_CHARS or ord(curline[i-1]) > 127):
 i -= 1
 comp_start = curline[i:j]
 if i and curline[i-1] == '.':
 hp.set_index("insert-%dc" % (len(curline)-(i-1)))
 comp_what = hp.get_expression()
 if not comp_what or \
 (not evalfuncs and comp_what.find('(') != -1):
 return None
 else:
 comp_what = ""
 else:
 return None

 if complete and not comp_what and not comp_start:
 return None
 comp_lists = self.fetch_completions(comp_what, mode)
 if not comp_lists[0]:
 return None
 self.autocompletewindow = self._make_autocomplete_window()
 return not self.autocompletewindow.show_window(
 comp_lists, "insert-%dc" % len(comp_start),
 complete, mode, userWantsWin)

 def fetch_completions(self, what, mode):
 """Return a pair of lists of completions for something. The first list
 is a sublist of the second. Both are sorted.

 If there is a Python subprocess, get the comp. list there. Otherwise,
 either fetch_completions() 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.
 """
 try:
 rpcclt = self.editwin.flist.pyshell.interp.rpcclt
 except:
 rpcclt = None
 if rpcclt:
 return rpcclt.remotecall("exec", "get_the_completion_list",
 (what, mode), {})
 else:
 if mode == COMPLETE_ATTRIBUTES:
 if what == "":
 namespace = {**__main__.__builtins__.__dict__,
 **__main__.__dict__}
 bigl = eval("dir()", namespace)
 bigl.sort()
 if "__all__" in bigl:
 smalll = sorted(eval("__all__", namespace))
 else:
 smalll = [s for s in bigl if s[:1] != '_']
 else:
 try:
 entity = self.get_entity(what)
 bigl = dir(entity)
 bigl.sort()
 if "__all__" in bigl:
 smalll = sorted(entity.__all__)
 else:
 smalll = [s for s in bigl if s[:1] != '_']
 except:
 return [], []

 elif mode == COMPLETE_FILES:
 if what == "":
 what = "."
 try:
 expandedpath = os.path.expanduser(what)
 bigl = os.listdir(expandedpath)
 bigl.sort()
 smalll = [s for s in bigl if s[:1] != '.']
 except OSError:
 return [], []

 if not smalll:
 smalll = bigl
 return smalll, bigl

 def get_entity(self, name):
 "Lookup name in a namespace spanning sys.modules and __main.dict__."
 return eval(name, {**sys.modules, **__main__.__dict__})


AutoComplete.reload()

if __name__ == '__main__':
 from unittest import main
 main('idlelib.idle_test.test_autocomplete', verbosity=2)