text: """More comprehensive traceback formatting for Python scripts.
  
  To enable this module, do:
  
      import cgitb; cgitb.enable()
  
  at the top of your script.  The optional arguments to enable() are:
  
      display     - if true, tracebacks are displayed in the web browser
      logdir      - if set, tracebacks are written to files in this directory
      context     - number of lines of source code to show for each stack frame
      format      - 'text' or 'html' controls the output format
  
  By default, tracebacks are displayed but not saved, the context is 5 lines
  and the output format is 'html' (for backwards compatibility with the
  original use of this module)
  
  Alternatively, if you have caught an exception and want cgitb to display it
  for you, call cgitb.handler().  The optional argument to handler() is a
  3-item tuple (etype, evalue, etb) just like the value of sys.exc_info().
  The default handler displays output as HTML.
  
  """
  import inspect
  import keyword
  import linecache
  import os
  import pydoc
  import sys
  import tempfile
  import time
  import tokenize
  import traceback
  
  def reset():
      """Return a string that resets the CGI and browser to a known state."""
      return '''<!--: spam
  Content-Type: text/html
  
  <body bgcolor="#f0f0f8"><font color="#f0f0f8" size="-5"> -->
  <body bgcolor="#f0f0f8"><font color="#f0f0f8" size="-5"> --> -->
  </font> </font> </font> </script> </object> </blockquote> </pre>
  </table> </table> </table> </table> </table> </font> </font> </font>'''
  
  __UNDEF__ = []                          # a special sentinel object
  def small(text):
      if text:
          return '<small>' + text + '</small>'
      else:
          return ''
  
  def strong(text):
      if text:
          return '<strong>' + text + '</strong>'
      else:
          return ''
  
  def grey(text):
      if text:
          return '<font color="#909090">' + text + '</font>'
      else:
          return ''
  
  def lookup(name, frame, locals):
      """Find the value for a given name in the given environment."""
      if name in locals:
          return 'local', locals[name]
      if name in frame.f_globals:
          return 'global', frame.f_globals[name]
      if '__builtins__' in frame.f_globals:
          builtins = frame.f_globals['__builtins__']
          if type(builtins) is type({}):
              if name in builtins:
                  return 'builtin', builtins[name]
          else:
              if hasattr(builtins, name):
                  return 'builtin', getattr(builtins, name)
      return None, __UNDEF__
  
  def scanvars(reader, frame, locals):
      """Scan one logical line of Python and look up values of variables used."""
      vars, lasttoken, parent, prefix, value = [], None, None, '', __UNDEF__
      for ttype, token, start, end, line in tokenize.generate_tokens(reader):
          if ttype == tokenize.NEWLINE: break
          if ttype == tokenize.NAME and token not in keyword.kwlist:
              if lasttoken == '.':
                  if parent is not __UNDEF__:
                      value = getattr(parent, token, __UNDEF__)
                      vars.append((prefix + token, prefix, value))
              else:
                  where, value = lookup(token, frame, locals)
                  vars.append((token, where, value))
          elif token == '.':
              prefix += lasttoken + '.'
              parent = value
          else:
              parent, prefix = None, ''
          lasttoken = token
      return vars
  
  def html(einfo, context=5):
      """Return a nice HTML document describing a given traceback."""
      etype, evalue, etb = einfo
      if isinstance(etype, type):
          etype = etype.__name__
      pyver = 'Python ' + sys.version.split()[0] + ': ' + sys.executable
      date = time.ctime(time.time())
      head = '<body bgcolor="#f0f0f8">' + pydoc.html.heading(
          '<big><big>%s</big></big>' %
          strong(pydoc.html.escape(str(etype))),
          '#ffffff', '#6622aa', pyver + '<br>' + date) + '''
  <p>A problem occurred in a Python script.  Here is the sequence of
  function calls leading up to the error, in the order they occurred.</p>'''
  
      indent = '<tt>' + small('&nbsp;' * 5) + '&nbsp;</tt>'
      frames = []
      records = inspect.getinnerframes(etb, context)
      for frame, file, lnum, func, lines, index in records:
          if file:
              file = os.path.abspath(file)
              link = '<a href="file://%s">%s</a>' % (file, pydoc.html.escape(file))
          else:
              file = link = '?'
          args, varargs, varkw, locals = inspect.getargvalues(frame)
          call = ''
          if func != '?':
              call = 'in ' + strong(pydoc.html.escape(func))
              if func != "<module>":
                  call += inspect.formatargvalues(args, varargs, varkw, locals,
                      formatvalue=lambda value: '=' + pydoc.html.repr(value))
  
          highlight = {}
          def reader(lnum=[lnum]):
              highlight[lnum[0]] = 1
              try: return linecache.getline(file, lnum[0])
              finally: lnum[0] += 1
          vars = scanvars(reader, frame, locals)
  
          rows = ['<tr><td bgcolor="#d8bbff">%s%s %s</td></tr>' %
                  ('<big>&nbsp;</big>', link, call)]
          if index is not None:
              i = lnum - index
              for line in lines:
                  num = small('&nbsp;' * (5-len(str(i))) + str(i)) + '&nbsp;'
                  if i in highlight:
                      line = '<tt>=&gt;%s%s</tt>' % (num, pydoc.html.preformat(line))
                      rows.append('<tr><td bgcolor="#ffccee">%s</td></tr>' % line)
                  else:
                      line = '<tt>&nbsp;&nbsp;%s%s</tt>' % (num, pydoc.html.preformat(line))
                      rows.append('<tr><td>%s</td></tr>' % grey(line))
                  i += 1
  
          done, dump = {}, []
          for name, where, value in vars:
              if name in done: continue
              done[name] = 1
              if value is not __UNDEF__:
                  if where in ('global', 'builtin'):
                      name = ('<em>%s</em> ' % where) + strong(name)
                  elif where == 'local':
                      name = strong(name)
                  else:
                      name = where + strong(name.split('.')[-1])
                  dump.append('%s&nbsp;= %s' % (name, pydoc.html.repr(value)))
              else:
                  dump.append(name + ' <em>undefined</em>')
  
          rows.append('<tr><td>%s</td></tr>' % small(grey(', '.join(dump))))
          frames.append('''
  <table width="100%%" cellspacing=0 cellpadding=0 border=0>
  %s</table>''' % '\n'.join(rows))
  
      exception = ['<p>%s: %s' % (strong(pydoc.html.escape(str(etype))),
                                  pydoc.html.escape(str(evalue)))]
      for name in dir(evalue):
          if name[:1] == '_': continue
          value = pydoc.html.repr(getattr(evalue, name))
          exception.append('\n<br>%s%s&nbsp;=\n%s' % (indent, name, value))
  
      return head + ''.join(frames) + ''.join(exception) + '''
  
  
  <!-- The above is a description of an error in a Python program, formatted
       for a web browser because the 'cgitb' module was enabled.  In case you
       are not reading this in a web browser, here is the original traceback:
  
  %s
  -->
  ''' % pydoc.html.escape(
            ''.join(traceback.format_exception(etype, evalue, etb)))
  
  def text(einfo, context=5):
      """Return a plain text document describing a given traceback."""
      etype, evalue, etb = einfo
      if isinstance(etype, type):
          etype = etype.__name__
      pyver = 'Python ' + sys.version.split()[0] + ': ' + sys.executable
      date = time.ctime(time.time())
      head = "%s\n%s\n%s\n" % (str(etype), pyver, date) + '''
  A problem occurred in a Python script.  Here is the sequence of
  function calls leading up to the error, in the order they occurred.
  '''
  
      frames = []
      records = inspect.getinnerframes(etb, context)
      for frame, file, lnum, func, lines, index in records:
          file = file and os.path.abspath(file) or '?'
          args, varargs, varkw, locals = inspect.getargvalues(frame)
          call = ''
          if func != '?':
              call = 'in ' + func
              if func != "<module>":
                  call += inspect.formatargvalues(args, varargs, varkw, locals,
                      formatvalue=lambda value: '=' + pydoc.text.repr(value))
  
          highlight = {}
          def reader(lnum=[lnum]):
              highlight[lnum[0]] = 1
              try: return linecache.getline(file, lnum[0])
              finally: lnum[0] += 1
          vars = scanvars(reader, frame, locals)
  
          rows = [' %s %s' % (file, call)]
          if index is not None:
              i = lnum - index
              for line in lines:
                  num = '%5d ' % i
                  rows.append(num+line.rstrip())
                  i += 1
  
          done, dump = {}, []
          for name, where, value in vars:
              if name in done: continue
              done[name] = 1
              if value is not __UNDEF__:
                  if where == 'global': name = 'global ' + name
                  elif where != 'local': name = where + name.split('.')[-1]
                  dump.append('%s = %s' % (name, pydoc.text.repr(value)))
              else:
                  dump.append(name + ' undefined')
  
          rows.append('\n'.join(dump))
          frames.append('\n%s\n' % '\n'.join(rows))
  
      exception = ['%s: %s' % (str(etype), str(evalue))]
      for name in dir(evalue):
          value = pydoc.text.repr(getattr(evalue, name))
          exception.append('\n%s%s = %s' % (" "*4, name, value))
  
      return head + ''.join(frames) + ''.join(exception) + '''
  
  The above is a description of an error in a Python program.  Here is
  the original traceback:
  
  %s
  ''' % ''.join(traceback.format_exception(etype, evalue, etb))
  
  class Hook:
      """A hook to replace sys.excepthook that shows tracebacks in HTML."""
  
      def __init__(self, display=1, logdir=None, context=5, file=None,
                   format="html"):
          self.display = display          # send tracebacks to browser if true
          self.logdir = logdir            # log tracebacks to files if not None
          self.context = context          # number of source code lines per frame
          self.file = file or sys.stdout  # place to send the output
          self.format = format
  
      def __call__(self, etype, evalue, etb):
          self.handle((etype, evalue, etb))
  
      def handle(self, info=None):
          info = info or sys.exc_info()
          if self.format == "html":
              self.file.write(reset())
  
          formatter = (self.format=="html") and html or text
          plain = False
          try:
              doc = formatter(info, self.context)
          except:                         # just in case something goes wrong
              doc = ''.join(traceback.format_exception(*info))
              plain = True
  
          if self.display:
              if plain:
                  doc = pydoc.html.escape(doc)
                  self.file.write('<pre>' + doc + '</pre>\n')
              else:
                  self.file.write(doc + '\n')
          else:
              self.file.write('<p>A problem occurred in a Python script.\n')
  
          if self.logdir is not None:
              suffix = ['.txt', '.html'][self.format=="html"]
              (fd, path) = tempfile.mkstemp(suffix=suffix, dir=self.logdir)
  
              try:
                  with os.fdopen(fd, 'w') as file:
                      file.write(doc)
                  msg = '%s contains the description of this error.' % path
              except:
                  msg = 'Tried to save traceback to %s, but failed.' % path
  
              if self.format == 'html':
                  self.file.write('<p>%s</p>\n' % msg)
              else:
                  self.file.write(msg + '\n')
          try:
              self.file.flush()
          except: pass
  
  handler = Hook().handle
  def enable(display=1, logdir=None, context=5, format="html"):
      """Install an exception handler that formats tracebacks as HTML.
  
      The optional argument 'display' can be set to 0 to suppress sending the
      traceback to the browser, and 'logdir' can be set to a directory to cause
      tracebacks to be written to files there."""
      sys.excepthook = Hook(display=display, logdir=logdir,
                            context=context, format=format)
  