Mercurial > cpython-lru_cache-weakref

annotate Lib/traceback.py @ 3546:3f7cdf1663f7 legacy-trunk

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A version of swed that can import html files. Also demonstrates implementing object handlers in Python.
author Jack Jansen <jack.jansen@cwi.nl>
date Tue, 07 May 1996 15:25:36 +0000
parents 9497cdcdb6aa
children 8d50a96f8680
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1 # Format and print Python stack traces
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2 #
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3 # updated to take optional "file" named parameter
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4 # by Tommy Burnette, 9/20/95
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5
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6 import linecache
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7 import string
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8 import sys
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9 import types
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10
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11 def _print(file, str='', terminator='\n'):
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12 file.write(str+terminator)
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13
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14
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15 def print_tb(tb, limit=None, file=None):
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16 if not file:
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17 file = sys.stderr
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18 if limit is None:
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19 if hasattr(sys, 'tracebacklimit'):
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20 limit = sys.tracebacklimit
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21 n = 0
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22 while tb is not None and (limit is None or n < limit):
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23 f = tb.tb_frame
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24 lineno = tb.tb_lineno
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25 co = f.f_code
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26 filename = co.co_filename
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27 name = co.co_name
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28 _print(file,
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29 ' File "%s", line %d, in %s' % (filename,lineno,name))
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30 line = linecache.getline(filename, lineno)
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31 if line: _print(file, ' ' + string.strip(line))
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32 tb = tb.tb_next
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33 n = n+1
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34
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35 def format_tb(tb, limit = None):
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36 list = []
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37 for filename, lineno, name, line in extract_tb(tb, limit):
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38 item = ' File "%s", line %d, in %s\n' % (filename,lineno,name)
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39 if line:
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40 item = item + ' %s\n' % string.strip(line)
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41 list.append(item)
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42 return list
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43
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44 def extract_tb(tb, limit = None):
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45 if limit is None:
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46 if hasattr(sys, 'tracebacklimit'):
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47 limit = sys.tracebacklimit
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48 list = []
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49 n = 0
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50 while tb is not None and (limit is None or n < limit):
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51 f = tb.tb_frame
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52 lineno = tb.tb_lineno
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53 co = f.f_code
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54 filename = co.co_filename
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55 name = co.co_name
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56 line = linecache.getline(filename, lineno)
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57 if line: line = string.strip(line)
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58 else: line = None
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59 list.append(filename, lineno, name, line)
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60 tb = tb.tb_next
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61 n = n+1
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62 return list
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63
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64
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65 def print_exception(etype, value, tb, limit=None, file=None):
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66 if not file:
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67 file = sys.stderr
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68 if tb:
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69 _print(file, 'Traceback (innermost last):')
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70 print_tb(tb, limit, file)
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71 lines = format_exception_only(etype, value)
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72 for line in lines[:-1]:
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73 _print(file, line, ' ')
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74 _print(file, lines[-1], '')
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75
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76 def format_exception(etype, value, tb, limit = None):
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77 if tb:
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78 list = ['Traceback (innermost last):\n']
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79 list = list + format_tb(tb, limit)
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80 list = list + format_exception_only(etype, value)
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81 return list
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82
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83 def format_exception_only(etype, value):
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84 list = []
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85 if type(etype) == types.ClassType:
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86 stype = etype.__name__
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87 else:
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88 stype = etype
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89 if value is None:
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90 list.append(str(stype) + '\n')
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91 else:
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92 if etype is SyntaxError:
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93 try:
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94 msg, (filename, lineno, offset, line) = value
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95 except:
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96 pass
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97 else:
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98 if not filename: filename = "<string>"
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99 list.append(' File "%s", line %d\n' %
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100 (filename, lineno))
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101 i = 0
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102 while i < len(line) and \
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103 line[i] in string.whitespace:
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104 i = i+1
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105 list.append(' %s\n' % string.strip(line))
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106 s = ' '
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107 for c in line[i:offset-1]:
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108 if c in string.whitespace:
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109 s = s + c
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110 else:
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111 s = s + ' '
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112 list.append('%s^\n' % s)
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113 value = msg
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114 list.append('%s: %s\n' % (str(stype), str(value)))
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115 return list
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116
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117
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118 def print_exc(limit=None, file=None):
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119 if not file:
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120 file = sys.stderr
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121 print_exception(sys.exc_type, sys.exc_value, sys.exc_traceback,
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122 limit, file)
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123
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124 def print_last(limit=None, file=None):
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125 if not file:
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126 file = sys.stderr
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127 print_exception(sys.last_type, sys.last_value, sys.last_traceback,
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128 limit, file)