tracebac.py :  » Mobile » Python-for-PalmOS » Python-1.5.2+reduced-1.0 » Lib » dos-8x3 » Python Open Source

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Python Open Source » Mobile » Python for PalmOS 
Python for PalmOS » Python 1.5.2 reduced 1.0 » Lib » dos 8x3 » tracebac.py
# Format and print Python stack traces

import linecache
import string
import sys
import types

def _print(file, str='', terminator='\n'):
  file.write(str+terminator)


def print_list(extracted_list, file=None):
  if not file:
    file = sys.stderr
  for filename, lineno, name, line in extracted_list:
    _print(file,
           '  File "%s", line %d, in %s' % (filename,lineno,name))
    if line:
      _print(file, '    %s' % string.strip(line))

def format_list(extracted_list):
  list = []
  for filename, lineno, name, line in extracted_list:
    item = '  File "%s", line %d, in %s\n' % (filename,lineno,name)
    if line:
      item = item + '    %s\n' % string.strip(line)
    list.append(item)
  return list
  

def print_tb(tb, limit=None, file=None):
  if not file:
    file = sys.stderr
  if limit is None:
    if hasattr(sys, 'tracebacklimit'):
      limit = sys.tracebacklimit
  n = 0
  while tb is not None and (limit is None or n < limit):
    f = tb.tb_frame
    lineno = tb_lineno(tb)
    co = f.f_code
    filename = co.co_filename
    name = co.co_name
    _print(file,
           '  File "%s", line %d, in %s' % (filename,lineno,name))
    line = linecache.getline(filename, lineno)
    if line: _print(file, '    ' + string.strip(line))
    tb = tb.tb_next
    n = n+1

def format_tb(tb, limit = None):
  return format_list(extract_tb(tb, limit))

def extract_tb(tb, limit = None):
  if limit is None:
    if hasattr(sys, 'tracebacklimit'):
      limit = sys.tracebacklimit
  list = []
  n = 0
  while tb is not None and (limit is None or n < limit):
    f = tb.tb_frame
    lineno = tb_lineno(tb)
    co = f.f_code
    filename = co.co_filename
    name = co.co_name
    line = linecache.getline(filename, lineno)
    if line: line = string.strip(line)
    else: line = None
    list.append((filename, lineno, name, line))
    tb = tb.tb_next
    n = n+1
  return list


def print_exception(etype, value, tb, limit=None, file=None):
  if not file:
    file = sys.stderr
  if tb:
    _print(file, 'Traceback (innermost last):')
    print_tb(tb, limit, file)
  lines = format_exception_only(etype, value)
  for line in lines[:-1]:
    _print(file, line, ' ')
  _print(file, lines[-1], '')

def format_exception(etype, value, tb, limit = None):
  if tb:
    list = ['Traceback (innermost last):\n']
    list = list + format_tb(tb, limit)
  else:
    list = []
  list = list + format_exception_only(etype, value)
  return list

def format_exception_only(etype, value):
  list = []
  if type(etype) == types.ClassType:
    stype = etype.__name__
  else:
    stype = etype
  if value is None:
    list.append(str(stype) + '\n')
  else:
    if etype is SyntaxError:
      try:
        msg, (filename, lineno, offset, line) = value
      except:
        pass
      else:
        if not filename: filename = "<string>"
        list.append('  File "%s", line %d\n' %
              (filename, lineno))
        i = 0
        while i < len(line) and \
              line[i] in string.whitespace:
          i = i+1
        list.append('    %s\n' % string.strip(line))
        s = '    '
        for c in line[i:offset-1]:
          if c in string.whitespace:
            s = s + c
          else:
            s = s + ' '
        list.append('%s^\n' % s)
        value = msg
    list.append('%s: %s\n' % (str(stype), str(value)))
  return list


def print_exc(limit=None, file=None):
  if not file:
    file = sys.stderr
  try:
      etype, value, tb = sys.exc_info()
      print_exception(etype, value, tb, limit, file)
  finally:
      etype = value = tb = None

def print_last(limit=None, file=None):
  if not file:
    file = sys.stderr
  print_exception(sys.last_type, sys.last_value, sys.last_traceback,
      limit, file)


def print_stack(f=None, limit=None, file=None):
  if f is None:
    try:
      raise ZeroDivisionError
    except ZeroDivisionError:
      f = sys.exc_info()[2].tb_frame.f_back
  print_list(extract_stack(f, limit), file)

def format_stack(f=None, limit=None):
  if f is None:
    try:
      raise ZeroDivisionError
    except ZeroDivisionError:
      f = sys.exc_info()[2].tb_frame.f_back
  return format_list(extract_stack(f, limit))

def extract_stack(f=None, limit = None):
  if f is None:
    try:
      raise ZeroDivisionError
    except ZeroDivisionError:
      f = sys.exc_info()[2].tb_frame.f_back
  if limit is None:
    if hasattr(sys, 'tracebacklimit'):
      limit = sys.tracebacklimit
  list = []
  n = 0
  while f is not None and (limit is None or n < limit):
    lineno = f.f_lineno  # XXX Too bad if -O is used
    co = f.f_code
    filename = co.co_filename
    name = co.co_name
    line = linecache.getline(filename, lineno)
    if line: line = string.strip(line)
    else: line = None
    list.append((filename, lineno, name, line))
    f = f.f_back
    n = n+1
  list.reverse()
  return list

# Calculate the correct line number of the traceback given in tb (even
# with -O on).
# Coded by Marc-Andre Lemburg from the example of PyCode_Addr2Line()
# in compile.c.
# Revised version by Jim Hugunin to work with JPython too.

def tb_lineno(tb):
  c = tb.tb_frame.f_code
  if not hasattr(c, 'co_lnotab'):
    return tb.tb_lineno

  tab = c.co_lnotab
  line = c.co_firstlineno
  stopat = tb.tb_lasti
  addr = 0
  for i in range(0, len(tab), 2):
    addr = addr + ord(tab[i])
    if addr > stopat:
      break
    line = line + ord(tab[i+1])
  return line
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