# Format and print Python stack traces

import linecache
import string
import sys

def print_tb(tb, limit = None):
	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.tb_lineno
		co = f.f_code
		filename = co.co_filename
		name = co.co_name
		print '  File "%s", line %d, in %s' % (filename, lineno, name)
		line = linecache.getline(filename, lineno)
		if line: print '    ' + string.strip(line)
		tb = tb.tb_next
		n = n+1

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.tb_lineno
		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(type, value, tb, limit = None):
	print 'Traceback (innermost last):'
	print_tb(tb, limit)
	print type,
	if value is not None: print ':', value,
	print

def print_exc(limit = None):
	print_exception(sys.exc_type, sys.exc_value, sys.exc_traceback,
			limit)

def print_last(limit = None):
	print_exception(sys.last_type, sys.last_value, sys.last_traceback,
			limit)