Nabble - Emacs - Sources

"""Definitions used by commands sent to inferior Python in python.el."""

# Copyright (C) 2004, 2005, 2006, 2007, 2008  Free Software Foundation, Inc.

# Author: Dave Love <fx@...>

# This file is part of GNU Emacs.

# This file is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation, either version 3 of the License, or

# (at your option) any later version.

# This file is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License

# along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

# $Revision: 1.17 $

import os, sys, traceback, inspect, keyword

### Python 2.3 compatibility

# Python 2.3 doesn't have `set'.  Avoid a warning in Python 2.6 or

# error in 3.0.  (We can't put the import in a conditional block to

# avoid the warning.)

try: set

except: from sets import Set as set # Python 2.3

### Python 2/3 compatibility

# According to the Python doc, you're meant to maintain separate

# version 2 and version 3 files, deriving the latter from the former

# with `2to3'.  However, we have a dynamic language, and using

# compatibility functions like this is more maintainable once you've

# fixed the things 2to3 complains about that aren't syntax errors.

# Use the Python 3 function, if available.

if not keyword.iskeyword ("print"): # Python 3

    # This avoids syntax errors in Python 2.

    printit = eval ("print")

    execit = eval ("exec")

else:				# Python 2

    # execit

    eval (compile ("""

def execit (string, dict = None):

    "Compatibility with Python 3's `exec' for Python 2."

    if dict:

        exec string in dict

    else:

        exec string

""",'emacs.py','single'))

    # printit

    eval (compile ("""

def printit (obj, end = '\\n'):

    "Partial compatibility with Python 3's `print' for Python 2."

    if end == ' ':

        print obj,

    elif end == '\\n':

        print obj

    else:

        # Not really right because of the trailing space, but not

        # called such that that matters.

        print '%s%s' % (obj, end),

""", 'emacs.py', 'single'))

### main code

__all__ = ["eexecfile", "eargs", "complete", "ehelp", "eimport",

           "modpath", "location_of"]

def eexecfile (file):

    """Execute FILE and then remove it.

    If we get an exception, print a traceback with the top frame

    (ourselves) excluded."""

    import __main__

    try:

        try:

            # Note that the file is closed by the (quasi-?) GC since

            # there's no reference to it kept.

            execit (open(file).read(), __main__.__dict__)

        except:

            (etype, value, tb) = sys.exc_info ()

            # Lose the stack frame for this location and for execit.

            tb = tb.tb_next.tb_next

            if tb is None:      # print_exception won't do it

                printit ("Traceback (most recent call last):")

            traceback.print_exception (etype, value, tb)

    finally:

        try: os.remove (file)

        except: pass            # e.g. file not found, but shouldn't happen

def eargs (name, imports):

    """Get arglist of NAME for Eldoc &c.

    Exec IMPORTS first."""

    try:

        try:                    # don't give up if the imports fail

            if imports: execit (imports)

            parts = name.split ('.')

            if len (parts) > 1:

                execit ('import ' + parts[0])

        except: pass

        func = eval (name)

        if inspect.isbuiltin (func) or inspect.isclass (func):

            doc = func.__doc__

            if doc.find (' ->') != -1:

                printit ('_emacs_out ' + doc.split (' ->')[0])

            elif doc.find ('\n') != -1:

                printit ('_emacs_out ' + doc.split ('\n')[0])

            else:

                raise RuntimeError

            return

        if inspect.ismethod (func):

            try:

                func = func.im_func # Python 2

            except:

                func = func.__func__ # Python 3

        if not inspect.isfunction (func):

            raise RuntimeError

        (args, varargs, varkw, defaults) = inspect.getargspec (func)

        # No space between name and arglist for consistency with builtins.

        printit ('_emacs_out ' + \

                 func.__name__ + \

                 inspect.formatargspec (args, varargs, varkw, defaults))

    except: printit ('_emacs_out ')

def all_names (object):

    """Return (an approximation to) a list of all possible attribute

    names reachable via the attributes of OBJECT, i.e. roughly the

    leaves of the dictionary tree under it."""

    def do_object (object, names):

        if inspect.ismodule (object):

            do_module (object, names)

        elif inspect.isclass (object):

            do_class (object, names)

        # Might have an object without its class in scope.

        elif hasattr (object, '__class__'):

            names.add ('__class__')

            do_class (object.__class__, names)

        # Probably not a good idea to try to enumerate arbitrary

        # dictionaries...

        return names

    def do_module (module, names):

        if hasattr (module, '__all__'): # limited export list

            names.update (module.__all__)

            for i in module.__all__:

                do_object (getattr (module, i), names)

        else:                   # use all names

            names.update (dir (module))

            for i in dir (module):

                do_object (getattr (module, i), names)

        return names

    def do_class (object, names):

        names.update (dir (object))

        if hasattr (object, '__bases__'): # superclasses

            for i in object.__bases__: do_object (i, names)

        return names

    return do_object (object, set ([]))

# Fixme:  Should do multiple dotted components -- see rlcompleter.

def complete (name, imports):

    """Complete NAME and print a Lisp list of completions.

    Exec IMPORTS first."""

    import __main__

    def class_members (object):

        names = dir (object)

        if hasattr (object, '__bases__'):

            for superc in object.__bases__:

                names = class_members (superc)

        return names    

    names = set ([])

    base = None

    try:

        dic = __main__.__dict__.copy()

        if imports:

            try: execit (imports, dic)

            except: pass

        l = len (name)

        dot = name.rfind ('.')

        if dot == -1:

            for elts in [__builtins__, keyword.kwlist,

                         list (dic.keys())]: # `list' for Python 3

                for elt in elts:

                    if elt[:l] == name: names.add (elt)

        else:

            base = name[:dot]

            name = name[dot+1:]

            try:

                obj = eval (base, dic)

                names = set (dir (obj))

                if hasattr (obj, '__class__'):

                    names.add ('__class__')

                    names.update (class_members (obj))

            except: names = all_names (dic)

    except: return []

    l = len (name)

    printit ('_emacs_out (', end=' ')

    for n in names:

        if name == n[:l]:

            if base: printit ('"%s.%s"' % (base, n), end = ' ')

            else: printit ('"%s"' % n, end = ' ')

    printit (')')

# Fixme:  This could try to look up methods/attributes applied to

# variables by generating possibilities like the completion code.  The

# trouble is that could be misleading if it gets the wrong one.

def ehelp (name, imports):

    """Get help on string NAME.

    First try to eval name, e.g. for user definitions where we need

    the object.  Otherwise try the string form.

    Exec IMPORTS first."""

    locls = {}

    if imports:

        try: execit (imports, locls)

        except: pass

    try: help (eval (name, globals (), locls))

    except: help (name)

def eimport (mod, dir):

    """Import module MOD with directory DIR at the head of the search path.

    NB doesn't load from DIR if MOD shadows a system module."""

    from __main__ import __dict__

    path0 = sys.path[0]         # will be ''

    sys.path[0] = dir

    try:

        try:

            if mod in __dict__ and inspect.ismodule (__dict__[mod]):

                reload (__dict__[mod])

            else:

                __dict__[mod] = __import__ (mod)

        except:

            (etype, value, tb) = sys.exc_info ()

            printit ("Traceback (most recent call last):")

            traceback.print_exception (etype, value, tb.tb_next)

    finally:

        sys.path[0] = path0

def modpath (module):

    """Get the source file for the given MODULE (or nil)."""

    locls = {}

    try:

        __import__ (module)

        printit ("_emacs_out " + \

            inspect.getsourcefile (eval (module, globals (), locls)))

    except:

        printit ("_emacs_out ()")

def location_of (name, imports):

    """Get location at which NAME is defined (or nil).

    Provides a pair (PATH, LINE), where LINE is the start of the definition

    in path name PATH.

    Exec IMPORTS first."""

    locls = {}

    if imports:

        try: execit (imports, locls)

        except: pass

    try:

        obj = eval (name, globals (), locls)

        # Bug: (in Python 2.5) `getsourcefile' only works with modules,

        # hence the `getmodule' here.

        srcfile = inspect.getsourcefile (inspect.getmodule (obj))

        _, line = inspect.getsourcelines (obj)

        printit ('_emacs_out ("%s" . %d)' % (srcfile, line))

    except:

        printit ("_emacs_out ()")

# print '_emacs_ok'             # ready for input and can call continuation

# arch-tag: d90408f3-90e2-4de4-99c2-6eb9c7b9ca46

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