bench/lvars-gvars.py

   1 # __COPYRIGHT__
   2 #
   3 # Functions and data for timing different idioms for fetching a keyword
   4 # value from a pair of dictionaries for localand global values.  This was
   5 # used to select how to most efficiently expand single $KEYWORD strings
   6 # in src/engine/SCons/Subst.py.
   7
   8 def Func1(var, gvars, lvars):
   9     """lvars try:-except:, gvars try:-except:"""
  10     for i in IterationList:
  11         try:
  12             x = lvars[var]
  13         except KeyError:
  14             try:
  15                 x = gvars[var]
  16             except KeyError:
  17                 x = ''
  18
  19 def Func2(var, gvars, lvars):
  20     """lvars has_key(), gvars try:-except:"""
  21     for i in IterationList:
  22         if var in lvars:
  23             x = lvars[var]
  24         else:
  25             try:
  26                 x = gvars[var]
  27             except KeyError:
  28                 x = ''
  29
  30 def Func3(var, gvars, lvars):
  31     """lvars has_key(), gvars has_key()"""
  32     for i in IterationList:
  33         if var in lvars:
  34             x = lvars[var]
  35         elif var in gvars:
  36             x = gvars[var]
  37         else:
  38             x = ''
  39
  40 def Func4(var, gvars, lvars):
  41     """eval()"""
  42     for i in IterationList:
  43         try:
  44             x = eval(var, gvars, lvars)
  45         except NameError:
  46             x = ''
  47
  48 def Func5(var, gvars, lvars):
  49     """Chained get with default values"""
  50     for i in IterationList:
  51         x = lvars.get(var,gvars.get(var,''))
  52
  53
  54 # Data to pass to the functions on each run.  Each entry is a
  55 # three-element tuple:
  56 #
  57 #   (
  58 #       "Label to print describing this data run",
  59 #       ('positional', 'arguments'),
  60 #       {'keyword' : 'arguments'},
  61 #   ),
  62
  63 Data = [
  64     (
  65         "Neither in gvars or lvars",
  66         ('x', {}, {}),
  67         {},
  68     ),
  69     (
  70         "Missing from lvars, found in gvars",
  71         ('x', {'x':1}, {}),
  72         {},
  73     ),
  74     (
  75         "Found in lvars",
  76         ('x', {'x':1}, {'x':2}),
  77         {},
  78     ),
  79 ]
  80
  81 # Local Variables:
  82 # tab-width:4
  83 # indent-tabs-mode:nil
  84 # End:
  85 # vim: set expandtab tabstop=4 shiftwidth=4: