Lib/lib-old/tb.py

   1 # Print tracebacks, with a dump of local variables.
   2 # Also an interactive stack trace browser.
   3 # Note -- this module is obsolete -- use pdb.pm() instead.
   4
   5 import sys
   6 import os
   7 from stat import *
   8 import linecache
   9
  10 def br(): browser(sys.last_traceback)
  11
  12 def tb(): printtb(sys.last_traceback)
  13
  14 def browser(tb):
  15         if not tb:
  16                 print 'No traceback.'
  17                 return
  18         tblist = []
  19         while tb:
  20                 tblist.append(tb)
  21                 tb = tb.tb_next
  22         ptr = len(tblist)-1
  23         tb = tblist[ptr]
  24         while 1:
  25                 if tb != tblist[ptr]:
  26                         tb = tblist[ptr]
  27                         print `ptr` + ':',
  28                         printtbheader(tb)
  29                 try:
  30                         line = raw_input('TB: ')
  31                 except KeyboardInterrupt:
  32                         print '\n[Interrupted]'
  33                         break
  34                 except EOFError:
  35                         print '\n[EOF]'
  36                         break
  37                 cmd = line.strip()
  38                 if cmd:
  39                         if cmd == 'quit':
  40                                 break
  41                         elif cmd == 'list':
  42                                 browserlist(tb)
  43                         elif cmd == 'up':
  44                                 if ptr-1 >= 0: ptr = ptr-1
  45                                 else: print 'Bottom of stack.'
  46                         elif cmd == 'down':
  47                                 if ptr+1 < len(tblist): ptr = ptr+1
  48                                 else: print 'Top of stack.'
  49                         elif cmd == 'locals':
  50                                 printsymbols(tb.tb_frame.f_locals)
  51                         elif cmd == 'globals':
  52                                 printsymbols(tb.tb_frame.f_globals)
  53                         elif cmd in ('?', 'help'):
  54                                 browserhelp()
  55                         else:
  56                                 browserexec(tb, cmd)
  57
  58 def browserlist(tb):
  59         filename = tb.tb_frame.f_code.co_filename
  60         lineno = tb.tb_lineno
  61         last = lineno
  62         first = max(1, last-10)
  63         for i in range(first, last+1):
  64                 if i == lineno: prefix = '***' + `i`.rjust(4) + ':'
  65                 else: prefix = `i`.rjust(7) + ':'
  66                 line = linecache.getline(filename, i)
  67                 if line[-1:] == '\n': line = line[:-1]
  68                 print prefix + line
  69
  70 def browserexec(tb, cmd):
  71         locals = tb.tb_frame.f_locals
  72         globals = tb.tb_frame.f_globals
  73         try:
  74                 exec cmd+'\n' in globals, locals
  75         except:
  76                 t, v = sys.exc_info()[:2]
  77                 print '*** Exception:',
  78                 if type(t) is type(''):
  79                         print t,
  80                 else:
  81                         print t.__name__,
  82                 if v is not None:
  83                         print ':', v,
  84                 print
  85                 print 'Type help to get help.'
  86
  87 def browserhelp():
  88         print
  89         print '    This is the traceback browser.  Commands are:'
  90         print '        up      : move one level up in the call stack'
  91         print '        down    : move one level down in the call stack'
  92         print '        locals  : print all local variables at this level'
  93         print '        globals : print all global variables at this level'
  94         print '        list    : list source code around the failure'
  95         print '        help    : print help (what you are reading now)'
  96         print '        quit    : back to command interpreter'
  97         print '    Typing any other 1-line statement will execute it'
  98         print '    using the current level\'s symbol tables'
  99         print
 100
 101 def printtb(tb):
 102         while tb:
 103                 print1tb(tb)
 104                 tb = tb.tb_next
 105
 106 def print1tb(tb):
 107         printtbheader(tb)
 108         if tb.tb_frame.f_locals is not tb.tb_frame.f_globals:
 109                 printsymbols(tb.tb_frame.f_locals)
 110
 111 def printtbheader(tb):
 112         filename = tb.tb_frame.f_code.co_filename
 113         lineno = tb.tb_lineno
 114         info = '"' + filename + '"(' + `lineno` + ')'
 115         line = linecache.getline(filename, lineno)
 116         if line:
 117                 info = info + ': ' + line.strip()
 118         print info
 119
 120 def printsymbols(d):
 121         keys = d.keys()
 122         keys.sort()
 123         for name in keys:
 124                 print '  ' + name.ljust(12) + ':',
 125                 printobject(d[name], 4)
 126                 print
 127
 128 def printobject(v, maxlevel):
 129         if v is None:
 130                 print 'None',
 131         elif type(v) in (type(0), type(0.0)):
 132                 print v,
 133         elif type(v) is type(''):
 134                 if len(v) > 20:
 135                         print `v[:17] + '...'`,
 136                 else:
 137                         print `v`,
 138         elif type(v) is type(()):
 139                 print '(',
 140                 printlist(v, maxlevel)
 141                 print ')',
 142         elif type(v) is type([]):
 143                 print '[',
 144                 printlist(v, maxlevel)
 145                 print ']',
 146         elif type(v) is type({}):
 147                 print '{',
 148                 printdict(v, maxlevel)
 149                 print '}',
 150         else:
 151                 print v,
 152
 153 def printlist(v, maxlevel):
 154         n = len(v)
 155         if n == 0: return
 156         if maxlevel <= 0:
 157                 print '...',
 158                 return
 159         for i in range(min(6, n)):
 160                 printobject(v[i], maxlevel-1)
 161                 if i+1 < n: print ',',
 162         if n > 6: print '...',
 163
 164 def printdict(v, maxlevel):
 165         keys = v.keys()
 166         n = len(keys)
 167         if n == 0: return
 168         if maxlevel <= 0:
 169                 print '...',
 170                 return
 171         keys.sort()
 172         for i in range(min(6, n)):
 173                 key = keys[i]
 174                 print `key` + ':',
 175                 printobject(v[key], maxlevel-1)
 176                 if i+1 < n: print ',',
 177         if n > 6: print '...',