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# The contents of this file are subject to the Mozilla Public License Version
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# The Original Code is standalone Firefox performance tests.
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#   Zach Lipton <zach@zachlipton.com>
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"""Utility functions"""

import os
DEBUG = 0
NOISY = 0
saved_environment = {}

def setdebug(val):
  global DEBUG
  DEBUG = val

def setnoisy(val):
  global NOISY
  NOISY = val

def noisy(message):
  """Prints messages from the browser/application that are generated, otherwise
     these are ignored.  Controlled through command line switch (-n or --noisy)
  """
  if NOISY == 1:
    print "NOISE: " + message

def debug(message):
  """Prints a debug message to the console if the DEBUG switch is turned on 
     debug switch is controlled through command line switch (-d or --debug)
     Args:
       message: string containing a debugging statement
     """
  if DEBUG == 1:
    print "DEBUG: " + message

def setEnvironmentVars(newVars): 
   """Sets environment variables as specified by env, an array of variables 
   from sample.config"""
   global saved_environment
   env = os.environ
   for var in newVars:
     # save the old values so they can be restored later:
     try:
       saved_environment[var] = str(env[var])
     except :
       saved_environment[var] = ""
     env[var] = str(newVars[var])

def restoreEnvironmentVars():
  """Restores environment variables to the state they were in before 
  setEnvironmentVars() was last called"""
  global saved_environment
  for var in saved_environment:
    os.environ[var] = saved_environment[var]