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"""Customized version of pdb's default debugger.
- sets up a history file
- uses ipython if available to colorize lines of code
- overrides list command to search for current block instead
of using 5 lines of context
:copyright: 2000-2008 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
:license: General Public License version 2 - http://www.gnu.org/licenses
"""
__docformat__ = "restructuredtext en"
try:
import readline
except ImportError:
readline = None
import os
import os.path as osp
import sys
from pdb import Pdb
from cStringIO import StringIO
import inspect
try:
from IPython import PyColorize
except ImportError:
def colorize(source, *args):
"""fallback colorize function"""
return source
else:
def colorize(source, start_lineno, curlineno):
""""""
parser = PyColorize.Parser()
output = StringIO()
parser.format(source, output)
annotated = []
for index, line in enumerate(output.getvalue().splitlines()):
lineno = index + start_lineno
if lineno == curlineno:
annotated.append('%4s\t->\t%s' % (lineno, line))
else:
annotated.append('%4s\t\t%s' % (lineno, line))
return '\n'.join(annotated)
def getsource(obj):
"""Return the text of the source code for an object.
The argument may be a module, class, method, function, traceback, frame,
or code object. The source code is returned as a single string. An
IOError is raised if the source code cannot be retrieved."""
lines, lnum = inspect.getsourcelines(obj)
return ''.join(lines), lnum
################################################################
class Debugger(Pdb):
"""custom debugger
- sets up a history file
- uses ipython if available to colorize lines of code
- overrides list command to search for current block instead
of using 5 lines of context
"""
def __init__(self, tcbk):
Pdb.__init__(self)
self.reset()
while tcbk.tb_next is not None:
tcbk = tcbk.tb_next
self._tcbk = tcbk
self._histfile = osp.join(os.environ["HOME"], ".pdbhist")
def setup_history_file(self):
"""if readline is available, read pdb history file
"""
if readline is not None:
try:
readline.read_history_file(self._histfile)
except IOError:
pass
def start(self):
"""starts the interactive mode"""
self.interaction(self._tcbk.tb_frame, self._tcbk)
def setup(self, frame, tcbk):
"""setup hook: set up history file"""
self.setup_history_file()
Pdb.setup(self, frame, tcbk)
def set_quit(self):
"""quit hook: save commands in the history file"""
if readline is not None:
readline.write_history_file(self._histfile)
Pdb.set_quit(self)
def complete_p(self, text, line, begin_idx, end_idx):
"""provide variable names completion for the ``p`` command"""
namespace = dict(self.curframe.f_globals)
namespace.update(self.curframe.f_locals)
if '.' in text:
return self.attr_matches(text, namespace)
return [varname for varname in namespace if varname.startswith(text)]
def attr_matches(self, text, namespace):
"""implementation coming from rlcompleter.Completer.attr_matches
Compute matches when text contains a dot.
Assuming the text is of the form NAME.NAME....[NAME], and is
evaluatable in self.namespace, it will be evaluated and its attributes
(as revealed by dir()) are used as possible completions. (For class
instances, class members are also considered.)
WARNING: this can still invoke arbitrary C code, if an object
with a __getattr__ hook is evaluated.
"""
import re
m = re.match(r"(\w+(\.\w+)*)\.(\w*)", text)
if not m:
return
expr, attr = m.group(1, 3)
object = eval(expr, namespace)
words = dir(object)
if hasattr(object,'__class__'):
words.append('__class__')
words = words + self.get_class_members(object.__class__)
matches = []
n = len(attr)
for word in words:
if word[:n] == attr and word != "__builtins__":
matches.append("%s.%s" % (expr, word))
return matches
def get_class_members(self, klass):
"""implementation coming from rlcompleter.get_class_members"""
ret = dir(klass)
if hasattr(klass,'__bases__'):
for base in klass.__bases__:
ret = ret + self.get_class_members(base)
return ret
## specific / overidden commands
def do_list(self, arg):
"""overrides default list command to display the surrounding block
instead of 5 lines of context
"""
self.lastcmd = 'list'
if not arg:
try:
source, start_lineno = getsource(self.curframe)
print colorize(''.join(source), start_lineno,
self.curframe.f_lineno)
except KeyboardInterrupt:
pass
except IOError:
Pdb.do_list(self, arg)
else:
Pdb.do_list(self, arg)
do_l = do_list
def do_open(self, arg):
"""opens source file corresponding to the current stack level"""
filename = self.curframe.f_code.co_filename
lineno = self.curframe.f_lineno
cmd = 'emacsclient --no-wait +%s %s' % (lineno, filename)
os.system(cmd)
do_o = do_open
def pm():
"""use our custom debugger"""
dbg = Debugger(sys.last_traceback)
dbg.start()
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