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# 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)
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.
def tb_lineno(tb):
c = tb.tb_frame.f_code
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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