lib/muff/muffuniv.py

   1 # Copyright (c) 2005 mudpy, Jeremy Stanley <fungi@yuggoth.org>, all rights reserved.
   2 # Licensed per terms in the LICENSE file distributed with this software.
   3
   4 # persistent variables are stored in ini-style files supported by ConfigParser
   5 import ConfigParser
   6
   7 # need to know the directory separator
   8 import os
   9
  10 # hack to load all modules in the muff package
  11 import muff
  12 for module in muff.__all__:
  13         exec("import " + module)
  14
  15 class Element:
  16         """An element of the universe."""
  17         def __init__(self, key, origin, universe):
  18                 """Default values for the in-memory element variables."""
  19                 self.key = key
  20                 self.origin = origin
  21                 universe.contents[key] = self
  22                 if not universe.files[origin].data.has_section(key):
  23                         universe.files[origin].data.add_section(key)
  24         def facets(self):
  25                 """Return a list of facets for this element."""
  26                 return universe.files[self.origin].data.options(self.key)
  27         def get(self, facet):
  28                 """Retrieve values."""
  29                 if facet in dir(self): return self.facet
  30                 else:
  31                         try:
  32                                 return universe.files[self.origin].data.get(self.key, facet)
  33                         except:
  34                                 return None
  35         def set(self, facet, value):
  36                 """Set values."""
  37                 if facet in universe.files[self.origin].data.options(self.key):
  38                         universe.files[self.origin].data.set(self.key, facet, value)
  39                 else: self.facet = value
  40         def rec(self, facet, value):
  41                 """Add initial values to the record."""
  42                 universe.files[self.origin].data.set(self.key, facet, value)
  43
  44 class DataFile:
  45         """A file containing universe elements."""
  46         def __init__(self, filename, universe):
  47                 filedir = os.sep.join(filename.split(os.sep)[:-1])
  48                 data = ConfigParser.SafeConfigParser()
  49                 data.read(filename)
  50                 self.filename = filename
  51                 self.data = data
  52                 universe.files[filename] = self
  53                 for section in data.sections():
  54                         if section == "include":
  55                                 for option in data.options(section):
  56                                         includefile = data.get(section, option)
  57                                         if not includefile.startswith(os.sep):
  58                                                 includefile = filedir + os.sep + includefile
  59                                         DataFile(includefile, universe)
  60                         else:
  61                                 Element(section, filename, universe)
  62         def save(self):
  63                 basedir = os.sep.join(self.filename.split(os.sep)[:-1])
  64                 if not os.access(basedir, os.F_OK): os.makedirs(basedir)
  65                 file_descriptor = file(self.filename, "w")
  66                 self.data.write(file_descriptor)
  67                 file_descriptor.flush()
  68                 file_descriptor.close()
  69
  70 class Universe:
  71         """The universe."""
  72         def __init__(self):
  73                 filename = muffconf.get("files", "data")
  74                 if not filename.startswith(os.sep): filename = os.getcwd() + os.sep + filename
  75                 self.contents = {}
  76                 self.files = {}
  77                 DataFile(filename, self)
  78         def save(self):
  79                 for key in self.files.keys(): self.files[key].save()
  80
  81 def element_exists(key): return key in universe.contents.keys()
  82
  83 # reload the muffconf module if the files:data setting does not exist
  84 try:
  85         if muffconf.get("files", "data"): pass
  86 except AttributeError:
  87         reload(muffconf)
  88
  89 # if there is no universe, create an empty one
  90 if not "universe" in dir(): universe = Universe()
  91