etc/emacs.py

   1 """Definitions used by commands sent to inferior Python in python.el."""
   2
   3 # Copyright (C) 2004, 2005, 2006  Free Software Foundation, Inc.
   4 # Author: Dave Love <fx@gnu.org>
   5
   6 # This file is part of GNU Emacs.
   7
   8 # GNU Emacs is free software; you can redistribute it and/or modify
   9 # it under the terms of the GNU General Public License as published by
  10 # the Free Software Foundation; either version 2, or (at your option)
  11 # any later version.
  12
  13 # GNU Emacs is distributed in the hope that it will be useful,
  14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 # GNU General Public License for more details.
  17
  18 # You should have received a copy of the GNU General Public License
  19 # along with GNU Emacs; see the file COPYING.  If not, write to the
  20 # Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  21 # Boston, MA 02110-1301, USA.
  22
  23 import os, sys, traceback, inspect, __main__
  24 from sets import Set
  25
  26 __all__ = ["eexecfile", "eargs", "complete", "ehelp", "eimport", "modpath"]
  27
  28 def eexecfile (file):
  29     """Execute FILE and then remove it.
  30     Execute the file within the __main__ namespace.
  31     If we get an exception, print a traceback with the top frame
  32     (ourselves) excluded."""
  33     try:
  34        try: execfile (file, __main__.__dict__)
  35        except:
  36             (type, value, tb) = sys.exc_info ()
  37             # Lose the stack frame for this location.
  38             tb = tb.tb_next
  39             if tb is None:      # print_exception won't do it
  40                 print "Traceback (most recent call last):"
  41             traceback.print_exception (type, value, tb)
  42     finally:
  43         os.remove (file)
  44
  45 def eargs (name, imports):
  46     "Get arglist of NAME for Eldoc &c."
  47     try:
  48         if imports: exec imports
  49         parts = name.split ('.')
  50         if len (parts) > 1:
  51             exec 'import ' + parts[0] # might fail
  52         func = eval (name)
  53         if inspect.isbuiltin (func):
  54             doc = func.__doc__
  55             if doc.find (' ->') != -1:
  56                 print '_emacs_out', doc.split (' ->')[0]
  57             elif doc.find ('\n') != -1:
  58                 print '_emacs_out', doc.split ('\n')[0]
  59             return
  60         if inspect.ismethod (func):
  61             func = func.im_func
  62         if not inspect.isfunction (func): return
  63         (args, varargs, varkw, defaults) = inspect.getargspec (func)
  64         # No space between name and arglist for consistency with builtins.
  65         print '_emacs_out', \
  66             func.__name__ + inspect.formatargspec (args, varargs, varkw,
  67                                                    defaults)
  68     except: pass
  69
  70 def all_names (object):
  71     """Return (an approximation to) a list of all possible attribute
  72     names reachable via the attributes of OBJECT, i.e. roughly the
  73     leaves of the dictionary tree under it."""
  74
  75     def do_object (object, names):
  76         if inspect.ismodule (object):
  77             do_module (object, names)
  78         elif inspect.isclass (object):
  79             do_class (object, names)
  80         # Might have an object without its class in scope.
  81         elif hasattr (object, '__class__'):
  82             names.add ('__class__')
  83             do_class (object.__class__, names)
  84         # Probably not a good idea to try to enumerate arbitrary
  85         # dictionaries...
  86         return names
  87
  88     def do_module (module, names):
  89         if hasattr (module, '__all__'): # limited export list
  90             names.union_update (module.__all__)
  91             for i in module.__all__:
  92                 do_object (getattr (module, i), names)
  93         else:                   # use all names
  94             names.union_update (dir (module))
  95             for i in dir (module):
  96                 do_object (getattr (module, i), names)
  97         return names
  98
  99     def do_class (object, names):
 100         ns = dir (object)
 101         names.union_update (ns)
 102         if hasattr (object, '__bases__'): # superclasses
 103             for i in object.__bases__: do_object (i, names)
 104         return names
 105
 106     return do_object (object, Set ([]))
 107
 108 def complete (name, imports):
 109     """Complete TEXT in NAMESPACE and print a Lisp list of completions.
 110     Exec IMPORTS first."""
 111     import __main__, keyword
 112
 113     def class_members(object):
 114         names = dir (object)
 115         if hasattr (object, '__bases__'):
 116             for super in object.__bases__:
 117                 names = class_members (super)
 118         return names
 119
 120     names = Set ([])
 121     base = None
 122     try:
 123         dict = __main__.__dict__.copy()
 124         if imports: exec imports in dict
 125         l = len (name)
 126         if not "." in name:
 127             for list in [dir (__builtins__), keyword.kwlist, dict.keys()]:
 128                 for elt in list:
 129                     if elt[:l] == name: names.add(elt)
 130         else:
 131             base = name[:name.rfind ('.')]
 132             name = name[name.rfind('.')+1:]
 133             try:
 134                 object = eval (base, dict)
 135                 names = Set (dir (object))
 136                 if hasattr (object, '__class__'):
 137                     names.add('__class__')
 138                     names.union_update (class_members (object))
 139             except: names = all_names (dict)
 140     except: return []
 141     l = len(name)
 142     print '_emacs_out (',
 143     for n in names:
 144         if name == n[:l]:
 145             if base: print '"%s.%s"' % (base, n),
 146             else: print '"%s"' % n,
 147     print ')'
 148
 149 def ehelp (name, imports):
 150     """Get help on string NAME.
 151     First try to eval name for, e.g. user definitions where we need
 152     the object.  Otherwise try the string form."""
 153     locls = {}
 154     if imports:
 155         try: exec imports in locls
 156         except: pass
 157     try: help (eval (name, globals(), locls))
 158     except: help (name)
 159
 160 def eimport (mod, dir):
 161     """Import module MOD with directory DIR at the head of the search path.
 162     NB doesn't load from DIR if MOD shadows a system module."""
 163     from __main__ import __dict__
 164
 165     path0 = sys.path[0]
 166     sys.path[0] = dir
 167     try:
 168         try:
 169             if __dict__.has_key(mod) and inspect.ismodule (__dict__[mod]):
 170                 reload (__dict__[mod])
 171             else:
 172                 __dict__[mod] = __import__ (mod)
 173         except:
 174             (type, value, tb) = sys.exc_info ()
 175             print "Traceback (most recent call last):"
 176             traceback.print_exception (type, value, tb.tb_next)
 177     finally:
 178         sys.path[0] = path0
 179
 180 def modpath (module):
 181     """Return the source file for the given MODULE (or None).
 182 Assumes that MODULE.py and MODULE.pyc are in the same directory."""
 183     try:
 184         path = __import__ (module).__file__
 185         if path[-4:] == '.pyc' and os.path.exists (path[0:-1]):
 186             path = path[:-1]
 187         print "_emacs_out", path
 188     except:
 189         print "_emacs_out ()"
 190
 191 # print '_emacs_ok'             # ready for input and can call continuation
 192
 193 # arch-tag: d90408f3-90e2-4de4-99c2-6eb9c7b9ca46