Source Code for Module commons.trace

 1  #!/usr/bin/env python 
 2  # -*- mode: python; tab-width: 4; indent-tabs-mode: nil; py-indent-offset: 4; -*- 
 3  # vim:ft=python:et:sw=4:ts=4 
 4   
 5  """ 
 6  Standalone program for tracing a Python program. Simply specify the module whose C{main} function we want to run. 
 7   
 8  @todo: Document this more completely. 
 9  """ 
10   
11  from __future__ import absolute_import 
12  from .startup import run_main 
13  import imp, linecache, sys 
14   
15 -class Tracer( object ): 
16 -    def __init__( self ): 
17          self.do_trace = False 
18   
19 -    def trace( self, frame, event, arg ): 
20          c = frame.f_code 
21          g = frame.f_globals 
22          # events: line, call 
23          module_name = g["__name__"] 
24          function_name = c.co_name 
25          if event == 'line' and ( self.do_trace and function_name.startswith( 'forms' ) or function_name.startswith( 'select_form' ) ): 
26              self.do_trace = True 
27              lineno = frame.f_lineno 
28              filename = '<unknown file>' 
29              line = '<line unavailable>' 
30              try: 
31                  filename = g["__file__"] 
32                  if (filename.endswith(".pyc") or 
33                      filename.endswith(".pyo")): 
34                      filename = filename[:-1] 
35                  line = linecache.getline( filename, lineno ) 
36                  if line is None or line.strip() == '': 
37                      line = '<line unavailable>' 
38              except KeyError: 
39                  pass 
40              print '%s:%d:\t%s:%s(%s):\t%s' % ( filename, 
41                      lineno, 
42                      module_name, 
43                      function_name, 
44                      ', '.join( c.co_varnames[ : c.co_argcount ] ), 
45                      line.rstrip() ) 
46          return self.trace 
47   
48 -def main( argv ): 
49      module_name = argv[ 1 ] 
50      args = argv[ 1 : ] 
51   
52      module = imp.load_module( module_name, 
53                                *imp.find_module( module_name ) ) 
54   
55      tracer = Tracer() 
56      sys.settrace( tracer.trace ) 
57   
58      module.main( args ) 
59   
60  run_main() 
61