File: process.py

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# -*- mode: python; indent-tabs-mode: nil; tab-width: 3 -*-
# vim: set tabstop=3 shiftwidth=3 expandtab:
#
# Copyright (C) 2001-2005 Ichiro Fujinaga, Michael Droettboom,
#                          and Karl MacMillan
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#

import os.path, sys, cStringIO
from util import Set
from dis import dis
from inspect import getmodule
from types import *

from args import *

# Finds the member variables that a method accesses and sets
def find_method_dependencies(method):
   buffer = cStringIO.StringIO()
   stdout = sys.stdout
   sys.stdout = buffer
   dis(method)
   bytecodes = [x.split() for x in buffer.getvalue().split("\n")]
   sys.stdout = stdout
   buffer.close()

   sets = Set()
   requires = Set()
   self = 0
   for bytecode in bytecodes:
      if len(bytecode) > 3:
         if self:
            if bytecode[1] == "STORE_ATTR":
               sets.append(bytecode[3][1:-1])
            elif bytecode[1] == "LOAD_ATTR":
               requires.append(bytecode[3][1:-1])
            self = 0
         elif (len(bytecode) > 3 and bytecode[1] == "LOAD_FAST" and
               bytecode[2] == "0"):
            self = 1
   requires = filter(lambda x: x not in sets, requires)
   if sets == [] and requires == []:
      print ("WARNING: %s appears to have no side effects." 
             "What are you, some kind of functional programmer? ;)" %
             method.__name__)
   return sets, requires

# Generic base class for high-level processes.
# Manages saving/loading of data necessary to perform some/all of a process.
class Process:
   def __init__(self, base_filename, display_only=0):
      self.base_filename = os.path.splitext(os.path.abspath(base_filename))[0]
      self.display_only = display_only
      self.current_step = 0

   def get_step_number(self, step, default = 0):
      if step == None:
         return default
      elif type(step) == StringType and step in self.steps:
         return self.steps.index(step)
      elif type(step) == IntType and step < len(self.steps):
         return step
      raise KeyError("%s does not identify a step in the process." % step)

   def get_filename(self, extension):
      # TODO: change so this returns a unique filename
      return self.base_filename + "." + extension

   def process(self, first_step=None, last_step=None, save_members=None):
      first_step = self.get_step_number(first_step)
      last_step = self.get_step_number(last_step, len(self.steps) - 1)

      for step in self.steps[first_step:last_step + 1]:
         if (step[:5] == "DEBUG" and step != self.steps[last_step]):
            continue
         self.__do_step(step)
      if save_members == None:
         for saveable in self.saveable_members():
            if (self.__dict__.has_key(saveable)):
               self.__save_attr(saveable)
      else:
         for save in save_members:
            self.__save_attr(save)

   def next(self):
      if self.current_step >= len(self.steps):
         return -1
      sets, requires = self.do_step(self.current_step)
      self.__save_attr(sets)
      self.current_step += 1

   def saveable_members(self):
      return [x[5:] for x in self.__class__.__dict__.keys()
              if x[:5] == "save_"]

   def __do_step(self, step):
      step_no = self.get_step_number(step)
      function = getattr(self, step)
      sets, requires = find_method_dependencies(function)
      for load in requires:
         if not hasattr(self, load):
            self.__load_attr(load, step)
      print "Step %d: %s" % (step_no, step)
      if not self.display_only:
         function()
      return sets, requires

   def __load_attr(self, load, step="unknown"):
      if not hasattr(self, "load_" + load):
         raise RuntimeError("The %s step requires the variable '%s'. "
                            "However, there is no load_%s function defined."
                            % (step, load, load))
      else:
         print "Loading %s" % load
         if not self.display_only:
            getattr(self, "load_" + load)()

   def __save_attr(self, save):
      if not hasattr(self, save):
         print ("WARNING: %s is not defined, therefore it can not be saved."
                % save)
      if not hasattr(self, "save_" + save):
         raise RuntimeError("The Gamera process system wants to save %s, "
                            "but there is no save_%s function defined."
                            % (save, save))
      else:
         print "Saving %s" % save
         if not self.display_only:
            getattr(self, "save_" + save)()

   steps = []


class ProcessWizard(Wizard):
   def __init__(self, shell, locals, process):
      self.shell = shell
      self.parent = None
      self.locals = locals
      self.process = process
      self.caption = self.process.__name__ + " process"
      self.init_args = ()

      self.dlg_select_steps = Args(
          [Radio("Perform the entire process", "All"),
           Radio("Perform part of the process", "Custom"),
           Choice("   Starting step", self.process.steps),
           Choice("   Ending step", self.process.steps, -1)],
#          caption=self.caption,
          function='cb_select_steps',
          title=('Select which steps of the %s process you would like to perform.' % self.process.__name__))

      if hasattr(self, 'dlg_init'):
         self.show(self.dlg_init)
      else:
         self.show(self.dlg_select_steps)

   def cb_init(self, *args):
      self.init_args = args
      return self.dlg_select_steps

   def cb_select_steps(self, all, custom, start_step, end_step):
      if all:
         start_step = 0
         end_step = len(self.process.steps) - 1
         self.start_step = start_step
         self.end_step = end_step
         self.saves = None
         return None
      elif custom:
         if start_step > end_step:
            end_step, start_step = start_step, end_step
         self.start_step = start_step
         self.end_step = end_step
         saves = Set()
         for step in range(start_step, end_step + 1):
            deps = find_method_dependencies(
                getattr(self.process, self.process.steps[step]))
            saves.extend(deps[0])
            saves.extend(deps[1])
         args = []
         self.saveables = []
         for step in saves:
            if hasattr(self.process, "save_" + step):
               args.append(Check("", step, 1))
               self.saveables.append(step)

         self.dlg_select_saves = Args(
             args,
#             caption=self.caption,
             title="Select which members to save.",
             function="cb_select_saves")
         return self.dlg_select_saves

   def cb_select_saves(self, *args):
      self.saves = []
      for x in range(len(args)):
         if args[x]:
            self.saves.append(self.saveables[x])

   def done(self):
      self.shell.run("%s.%s%s.process(%s, %s, %s)" %
                     (getmodule(self.process).__name__.split('.')[-1],
                      self.process.__name__,
                      self.init_args,
                      repr(self.process.steps[self.start_step]),
                      repr(self.process.steps[self.end_step]),
                      repr(self.saves)))