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821 lines
25 KiB
Python
821 lines
25 KiB
Python
#
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# imputil.py
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#
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# Written by Greg Stein. Public Domain.
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# No Copyright, no Rights Reserved, and no Warranties.
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#
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# Utilities to help out with custom import mechanisms.
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#
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# Additional modifications were contribed by Marc-Andre Lemburg and
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# Gordon McMillan.
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#
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# This module is maintained by Greg and is available at:
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# http://www.lyra.org/greg/python/imputil.py
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#
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# Since this isn't in the Python distribution yet, we'll use the CVS ID
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# for tracking:
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# $Id$
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#
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# note: avoid importing non-builtin modules
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import imp
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import sys
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import strop
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import __builtin__
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# for the DirectoryImporter
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import struct
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import marshal
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_StringType = type('')
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_ModuleType = type(sys)
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class ImportManager:
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"Manage the import process."
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def install(self):
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### warning: Python 1.6 will have a different hook mechanism; this
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### code will need to change.
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self.__chain_import = __builtin__.__import__
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self.__chain_reload = __builtin__.reload
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__builtin__.__import__ = self._import_hook
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### fix this
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#__builtin__.reload = None
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#__builtin__.reload = self._reload_hook
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def add_suffix(self, suffix, importer):
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assert isinstance(importer, SuffixImporter)
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self.suffixes.append((suffix, importer))
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######################################################################
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#
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# PRIVATE METHODS
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#
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def __init__(self):
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# we're definitely going to be importing something in the future,
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# so let's just load the OS-related facilities.
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if not _os_stat:
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_os_bootstrap()
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# Initialize the set of suffixes that we recognize and import.
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# The default will import dynamic-load modules first, followed by
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# .py files (or a .py file's cached bytecode)
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self.suffixes = [ ]
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for desc in imp.get_suffixes():
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if desc[2] == imp.C_EXTENSION:
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self.suffixes.append((desc[0], DynLoadSuffixImporter(desc)))
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self.suffixes.append(('.py', PySuffixImporter()))
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# This is the importer that we use for grabbing stuff from the
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# filesystem. It defines one more method (import_from_dir) for our use.
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self.fs_imp = _FilesystemImporter(self.suffixes)
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def _import_hook(self, fqname, globals=None, locals=None, fromlist=None):
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"""Python calls this hook to locate and import a module."""
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parts = strop.split(fqname, '.')
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# determine the context of this import
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parent = self._determine_import_context(globals)
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# if there is a parent, then its importer should manage this import
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if parent:
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module = parent.__importer__._do_import(parent, parts, fromlist)
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if module:
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return module
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# has the top module already been imported?
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try:
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top_module = sys.modules[parts[0]]
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except KeyError:
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# look for the topmost module
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top_module = self._import_top_module(parts[0])
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if not top_module:
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# the topmost module wasn't found at all.
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raise ImportError, 'No module named ' + fqname
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return self.__chain_import(name, globals, locals, fromlist)
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# fast-path simple imports
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if len(parts) == 1:
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if not fromlist:
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return top_module
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if not top_module.__dict__.get('__ispkg__'):
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# __ispkg__ isn't defined (the module was not imported by us), or
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# it is zero.
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#
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# In the former case, there is no way that we could import
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# sub-modules that occur in the fromlist (but we can't raise an
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# error because it may just be names) because we don't know how
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# to deal with packages that were imported by other systems.
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#
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# In the latter case (__ispkg__ == 0), there can't be any sub-
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# modules present, so we can just return.
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#
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# In both cases, since len(parts) == 1, the top_module is also
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# the "bottom" which is the defined return when a fromlist exists.
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return top_module
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importer = top_module.__dict__.get('__importer__')
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if importer:
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return importer._finish_import(top_module, parts[1:], fromlist)
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# If the importer does not exist, then we have to bail. A missing importer
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# means that something else imported the module, and we have no knowledge
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# of how to get sub-modules out of the thing.
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raise ImportError, 'No module named ' + fqname
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return self.__chain_import(name, globals, locals, fromlist)
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def _determine_import_context(self, globals):
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"""Returns the context in which a module should be imported.
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The context could be a loaded (package) module and the imported module
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will be looked for within that package. The context could also be None,
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meaning there is no context -- the module should be looked for as a
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"top-level" module.
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"""
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if not globals or not globals.get('__importer__'):
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# globals does not refer to one of our modules or packages. That
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# implies there is no relative import context (as far as we are
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# concerned), and it should just pick it off the standard path.
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return None
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# The globals refer to a module or package of ours. It will define
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# the context of the new import. Get the module/package fqname.
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parent_fqname = globals['__name__']
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# if a package is performing the import, then return itself (imports
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# refer to pkg contents)
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if globals['__ispkg__']:
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parent = sys.modules[parent_fqname]
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assert globals is parent.__dict__
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return parent
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i = strop.rfind(parent_fqname, '.')
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# a module outside of a package has no particular import context
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if i == -1:
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return None
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# if a module in a package is performing the import, then return the
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# package (imports refer to siblings)
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parent_fqname = parent_fqname[:i]
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parent = sys.modules[parent_fqname]
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assert parent.__name__ == parent_fqname
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return parent
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def _import_top_module(self, name):
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# scan sys.path looking for a location in the filesystem that contains
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# the module, or an Importer object that can import the module.
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for item in sys.path:
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if type(item) == _StringType:
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module = self.fs_imp.import_from_dir(item, name)
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else:
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module = item.import_top(name)
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if module:
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return module
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return None
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def _reload_hook(self, module):
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"Python calls this hook to reload a module."
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# reloading of a module may or may not be possible (depending on the
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# importer), but at least we can validate that it's ours to reload
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importer = module.__dict__.get('__importer__')
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if not importer:
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return self.__chain_reload(module)
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# okay. it is using the imputil system, and we must delegate it, but
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# we don't know what to do (yet)
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### we should blast the module dict and do another get_code(). need to
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### flesh this out and add proper docco...
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raise SystemError, "reload not yet implemented"
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class Importer:
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"Base class for replacing standard import functions."
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def install(self):
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sys.path.insert(0, self)
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def import_top(self, name):
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"Import a top-level module."
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return self._import_one(None, name, name)
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######################################################################
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#
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# PRIVATE METHODS
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#
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def _finish_import(self, top, parts, fromlist):
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# if "a.b.c" was provided, then load the ".b.c" portion down from
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# below the top-level module.
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bottom = self._load_tail(top, parts)
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# if the form is "import a.b.c", then return "a"
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if not fromlist:
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# no fromlist: return the top of the import tree
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return top
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# the top module was imported by self.
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#
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# this means that the bottom module was also imported by self (just
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# now, or in the past and we fetched it from sys.modules).
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#
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# since we imported/handled the bottom module, this means that we can
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# also handle its fromlist (and reliably use __ispkg__).
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# if the bottom node is a package, then (potentially) import some modules.
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#
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# note: if it is not a package, then "fromlist" refers to names in
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# the bottom module rather than modules.
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# note: for a mix of names and modules in the fromlist, we will
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# import all modules and insert those into the namespace of
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# the package module. Python will pick up all fromlist names
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# from the bottom (package) module; some will be modules that
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# we imported and stored in the namespace, others are expected
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# to be present already.
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if bottom.__ispkg__:
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self._import_fromlist(bottom, fromlist)
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# if the form is "from a.b import c, d" then return "b"
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return bottom
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def _import_one(self, parent, modname, fqname):
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"Import a single module."
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# has the module already been imported?
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try:
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return sys.modules[fqname]
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except KeyError:
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pass
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# load the module's code, or fetch the module itself
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result = self.get_code(parent, modname, fqname)
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if result is None:
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return None
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### backwards-compat
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if len(result) == 2:
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result = result + ({},)
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module = self._process_result(result, fqname)
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# insert the module into its parent
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if parent:
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setattr(parent, modname, module)
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return module
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def _process_result(self, (ispkg, code, values), fqname):
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# did get_code() return an actual module? (rather than a code object)
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is_module = type(code) is _ModuleType
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# use the returned module, or create a new one to exec code into
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if is_module:
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module = code
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else:
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module = imp.new_module(fqname)
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### record packages a bit differently??
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module.__importer__ = self
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module.__ispkg__ = ispkg
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# insert additional values into the module (before executing the code)
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module.__dict__.update(values)
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# the module is almost ready... make it visible
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sys.modules[fqname] = module
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# execute the code within the module's namespace
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if not is_module:
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exec code in module.__dict__
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return module
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def _load_tail(self, m, parts):
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"""Import the rest of the modules, down from the top-level module.
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Returns the last module in the dotted list of modules.
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"""
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for part in parts:
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fqname = "%s.%s" % (m.__name__, part)
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m = self._import_one(m, part, fqname)
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if not m:
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raise ImportError, "No module named " + fqname
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return m
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def _import_fromlist(self, package, fromlist):
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'Import any sub-modules in the "from" list.'
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# if '*' is present in the fromlist, then look for the '__all__' variable
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# to find additional items (modules) to import.
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if '*' in fromlist:
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fromlist = list(fromlist) + list(package.__dict__.get('__all__', []))
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for sub in fromlist:
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# if the name is already present, then don't try to import it (it
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# might not be a module!).
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if sub != '*' and not hasattr(package, sub):
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subname = "%s.%s" % (package.__name__, sub)
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submod = self._import_one(package, sub, subname)
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if not submod:
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raise ImportError, "cannot import name " + subname
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def _do_import(self, parent, parts, fromlist):
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"""Attempt to import the module relative to parent.
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This method is used when the import context specifies that <self>
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imported the parent module.
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"""
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top_name = parts[0]
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top_fqname = parent.__name__ + '.' + top_name
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top_module = self._import_one(parent, top_name, top_fqname)
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if not top_module:
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# this importer and parent could not find the module (relatively)
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return None
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return self._finish_import(top_module, parts[1:], fromlist)
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######################################################################
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#
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# METHODS TO OVERRIDE
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#
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def get_code(self, parent, modname, fqname):
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"""Find and retrieve the code for the given module.
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parent specifies a parent module to define a context for importing. It
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may be None, indicating no particular context for the search.
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modname specifies a single module (not dotted) within the parent.
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fqname specifies the fully-qualified module name. This is a (potentially)
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dotted name from the "root" of the module namespace down to the modname.
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If there is no parent, then modname==fqname.
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This method should return None, or a 3-tuple.
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* If the module was not found, then None should be returned.
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* The first item of the 2- or 3-tuple should be the integer 0 or 1,
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specifying whether the module that was found is a package or not.
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* The second item is the code object for the module (it will be
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executed within the new module's namespace). This item can also
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be a fully-loaded module object (e.g. loaded from a shared lib).
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* The third item is a dictionary of name/value pairs that will be
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inserted into new module before the code object is executed. This
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is provided in case the module's code expects certain values (such
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as where the module was found). When the second item is a module
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object, then these names/values will be inserted *after* the module
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has been loaded/initialized.
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"""
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raise RuntimeError, "get_code not implemented"
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######################################################################
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#
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# Some handy stuff for the Importers
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#
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# byte-compiled file suffic character
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_suffix_char = __debug__ and 'c' or 'o'
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# byte-compiled file suffix
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_suffix = '.py' + _suffix_char
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# the C_EXTENSION suffixes
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_c_suffixes = filter(lambda x: x[2] == imp.C_EXTENSION, imp.get_suffixes())
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def _compile(pathname, timestamp):
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"""Compile (and cache) a Python source file.
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The file specified by <pathname> is compiled to a code object and
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returned.
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Presuming the appropriate privileges exist, the bytecodes will be
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saved back to the filesystem for future imports. The source file's
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modification timestamp must be provided as a Long value.
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"""
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codestring = open(pathname, 'r').read()
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if codestring and codestring[-1] != '\n':
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codestring = codestring + '\n'
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code = __builtin__.compile(codestring, pathname, 'exec')
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# try to cache the compiled code
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try:
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f = open(pathname + _suffix_char, 'wb')
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except IOError:
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pass
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else:
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f.write('\0\0\0\0')
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f.write(struct.pack('<I', timestamp))
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marshal.dump(code, f)
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f.flush()
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f.seek(0, 0)
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f.write(imp.get_magic())
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f.close()
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return code
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_os_stat = _os_path_join = None
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def _os_bootstrap():
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"Set up 'os' module replacement functions for use during import bootstrap."
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names = sys.builtin_module_names
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join = None
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if 'posix' in names:
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sep = '/'
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from posix import stat
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elif 'nt' in names:
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sep = '\\'
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from nt import stat
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elif 'dos' in names:
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sep = '\\'
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from dos import stat
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elif 'os2' in names:
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sep = '\\'
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from os2 import stat
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elif 'mac' in names:
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from mac import stat
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def join(a, b):
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if a == '':
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return b
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path = s
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if ':' not in a:
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a = ':' + a
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if a[-1:] <> ':':
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a = a + ':'
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return a + b
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else:
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raise ImportError, 'no os specific module found'
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if join is None:
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def join(a, b, sep=sep):
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if a == '':
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return b
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lastchar = a[-1:]
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if lastchar == '/' or lastchar == sep:
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return a + b
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return a + sep + b
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global _os_stat
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_os_stat = stat
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global _os_path_join
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_os_path_join = join
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def _os_path_isdir(pathname):
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"Local replacement for os.path.isdir()."
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try:
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s = _os_stat(pathname)
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except OSError:
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return None
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return (s[0] & 0170000) == 0040000
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|
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def _timestamp(pathname):
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"Return the file modification time as a Long."
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try:
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s = _os_stat(pathname)
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except OSError:
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return None
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return long(s[8])
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def _fs_import(dir, modname, fqname):
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"Fetch a module from the filesystem."
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|
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pathname = _os_path_join(dir, modname)
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if _os_path_isdir(pathname):
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values = { '__pkgdir__' : pathname, '__path__' : [ pathname ] }
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ispkg = 1
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pathname = _os_path_join(pathname, '__init__')
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else:
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values = { }
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ispkg = 0
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# look for dynload modules
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for desc in _c_suffixes:
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file = pathname + desc[0]
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try:
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fp = open(file, desc[1])
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except IOError:
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pass
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else:
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module = imp.load_module(fqname, fp, file, desc)
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values['__file__'] = file
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return 0, module, values
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t_py = _timestamp(pathname + '.py')
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t_pyc = _timestamp(pathname + _suffix)
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if t_py is None and t_pyc is None:
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return None
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code = None
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if t_py is None or (t_pyc is not None and t_pyc >= t_py):
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file = pathname + _suffix
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f = open(file, 'rb')
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if f.read(4) == imp.get_magic():
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t = struct.unpack('<I', f.read(4))[0]
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if t == t_py:
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code = marshal.load(f)
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f.close()
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if code is None:
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file = pathname + '.py'
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code = _compile(file, t_py)
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values['__file__'] = file
|
|
return ispkg, code, values
|
|
|
|
|
|
######################################################################
|
|
#
|
|
# Simple function-based importer
|
|
#
|
|
class FuncImporter(Importer):
|
|
"Importer subclass to use a supplied function rather than method overrides."
|
|
def __init__(self, func):
|
|
self.func = func
|
|
def get_code(self, parent, modname, fqname):
|
|
return self.func(parent, modname, fqname)
|
|
|
|
def install_with(func):
|
|
FuncImporter(func).install()
|
|
|
|
|
|
######################################################################
|
|
#
|
|
# Base class for archive-based importing
|
|
#
|
|
class PackageArchiveImporter(Importer):
|
|
"""Importer subclass to import from (file) archives.
|
|
|
|
This Importer handles imports of the style <archive>.<subfile>, where
|
|
<archive> can be located using a subclass-specific mechanism and the
|
|
<subfile> is found in the archive using a subclass-specific mechanism.
|
|
|
|
This class defines two hooks for subclasses: one to locate an archive
|
|
(and possibly return some context for future subfile lookups), and one
|
|
to locate subfiles.
|
|
"""
|
|
|
|
def get_code(self, parent, modname, fqname):
|
|
if parent:
|
|
# the Importer._finish_import logic ensures that we handle imports
|
|
# under the top level module (package / archive).
|
|
assert parent.__importer__ == self
|
|
|
|
# if a parent "package" is provided, then we are importing a sub-file
|
|
# from the archive.
|
|
result = self.get_subfile(parent.__archive__, modname)
|
|
if result is None:
|
|
return None
|
|
if type(result) == type(()):
|
|
return (0,) + result
|
|
return 0, result
|
|
|
|
# no parent was provided, so the archive should exist somewhere on the
|
|
# default "path".
|
|
archive = self.get_archive(modname)
|
|
if archive is None:
|
|
return None
|
|
return 1, "", {'__archive__':archive}
|
|
|
|
def get_archive(self, modname):
|
|
"""Get an archive of modules.
|
|
|
|
This method should locate an archive and return a value which can be
|
|
used by get_subfile to load modules from it. The value may be a simple
|
|
pathname, an open file, or a complex object that caches information
|
|
for future imports.
|
|
|
|
Return None if the archive was not found.
|
|
"""
|
|
raise RuntimeError, "get_archive not implemented"
|
|
|
|
def get_subfile(self, archive, modname):
|
|
"""Get code from a subfile in the specified archive.
|
|
|
|
Given the specified archive (as returned by get_archive()), locate
|
|
and return a code object for the specified module name.
|
|
|
|
A 2-tuple may be returned, consisting of a code object and a dict
|
|
of name/values to place into the target module.
|
|
|
|
Return None if the subfile was not found.
|
|
"""
|
|
raise RuntimeError, "get_subfile not implemented"
|
|
|
|
|
|
class PackageArchive(PackageArchiveImporter):
|
|
"PackageArchiveImporter subclass that refers to a specific archive."
|
|
|
|
def __init__(self, modname, archive_pathname):
|
|
self.__modname = modname
|
|
self.__path = archive_pathname
|
|
|
|
def get_archive(self, modname):
|
|
if modname == self.__modname:
|
|
return self.__path
|
|
return None
|
|
|
|
# get_subfile is passed the full pathname of the archive
|
|
|
|
|
|
######################################################################
|
|
#
|
|
# Emulate the standard directory-based import mechanism
|
|
#
|
|
class DirectoryImporter(Importer):
|
|
"Importer subclass to emulate the standard importer."
|
|
|
|
def __init__(self, dir):
|
|
self.dir = dir
|
|
|
|
def get_code(self, parent, modname, fqname):
|
|
if parent:
|
|
dir = parent.__pkgdir__
|
|
else:
|
|
dir = self.dir
|
|
|
|
# defer the loading of OS-related facilities
|
|
if not _os_stat:
|
|
_os_bootstrap()
|
|
|
|
# Return the module (and other info) if found in the specified
|
|
# directory. Otherwise, return None.
|
|
return _fs_import(dir, modname, fqname)
|
|
|
|
def __repr__(self):
|
|
return '<%s.%s for "%s" at 0x%x>' % (self.__class__.__module__,
|
|
self.__class__.__name__,
|
|
self.dir,
|
|
id(self))
|
|
|
|
######################################################################
|
|
#
|
|
# Emulate the standard path-style import mechanism
|
|
#
|
|
class PathImporter(Importer):
|
|
def __init__(self, path=sys.path):
|
|
self.path = path
|
|
|
|
# we're definitely going to be importing something in the future,
|
|
# so let's just load the OS-related facilities.
|
|
if not _os_stat:
|
|
_os_bootstrap()
|
|
|
|
def get_code(self, parent, modname, fqname):
|
|
if parent:
|
|
# we are looking for a module inside of a specific package
|
|
return _fs_import(parent.__pkgdir__, modname, fqname)
|
|
|
|
# scan sys.path, looking for the requested module
|
|
for dir in self.path:
|
|
result = _fs_import(dir, modname, fqname)
|
|
if result:
|
|
return result
|
|
|
|
# not found
|
|
return None
|
|
|
|
|
|
######################################################################
|
|
#
|
|
# Emulate the import mechanism for builtin and frozen modules
|
|
#
|
|
class BuiltinImporter(Importer):
|
|
def get_code(self, parent, modname, fqname):
|
|
if parent:
|
|
# these modules definitely do not occur within a package context
|
|
return None
|
|
|
|
# look for the module
|
|
if imp.is_builtin(modname):
|
|
type = imp.C_BUILTIN
|
|
elif imp.is_frozen(modname):
|
|
type = imp.PY_FROZEN
|
|
else:
|
|
# not found
|
|
return None
|
|
|
|
# got it. now load and return it.
|
|
module = imp.load_module(modname, None, modname, ('', '', type))
|
|
return 0, module, { }
|
|
|
|
|
|
######################################################################
|
|
#
|
|
# Internal importer used for importing from the filesystem
|
|
#
|
|
class _FilesystemImporter(Importer):
|
|
def __init__(self, suffixes):
|
|
# this list is shared with the ImportManager.
|
|
self.suffixes = suffixes
|
|
|
|
def import_from_dir(self, dir, fqname):
|
|
result = self._import_pathname(_os_path_join(dir, fqname), fqname)
|
|
if result:
|
|
return self._process_result(result, fqname)
|
|
return None
|
|
|
|
def get_code(self, parent, modname, fqname):
|
|
# This importer is never used with an empty parent. Its existence is
|
|
# private to the ImportManager. The ImportManager uses the
|
|
# import_from_dir() method to import top-level modules/packages.
|
|
# This method is only used when we look for a module within a package.
|
|
assert parent
|
|
|
|
return self._import_pathname(_os_path_join(parent.__pkgdir__, modname),
|
|
fqname)
|
|
|
|
def _import_pathname(self, pathname, fqname):
|
|
if _os_path_isdir(pathname):
|
|
result = self._import_pathname(_os_path_join(pathname, '__init__'),
|
|
fqname)
|
|
if result:
|
|
values = result[2]
|
|
values['__pkgdir__'] = pathname
|
|
values['__path__'] = [ pathname ]
|
|
return 1, result[1], values
|
|
return None
|
|
|
|
for suffix, importer in self.suffixes:
|
|
filename = pathname + suffix
|
|
try:
|
|
finfo = _os_stat(filename)
|
|
except OSError:
|
|
pass
|
|
else:
|
|
return importer.import_file(filename, finfo, fqname)
|
|
return None
|
|
|
|
######################################################################
|
|
#
|
|
# SUFFIX-BASED IMPORTERS
|
|
#
|
|
|
|
class SuffixImporter:
|
|
def import_file(self, filename, finfo, fqname):
|
|
raise RuntimeError
|
|
|
|
class PySuffixImporter(SuffixImporter):
|
|
def import_file(self, filename, finfo, fqname):
|
|
file = filename[:-3] + _suffix
|
|
t_py = long(finfo[8])
|
|
t_pyc = _timestamp(file)
|
|
|
|
code = None
|
|
if t_pyc is not None and t_pyc >= t_py:
|
|
f = open(file, 'rb')
|
|
if f.read(4) == imp.get_magic():
|
|
t = struct.unpack('<I', f.read(4))[0]
|
|
if t == t_py:
|
|
code = marshal.load(f)
|
|
f.close()
|
|
if code is None:
|
|
file = filename
|
|
code = _compile(file, t_py)
|
|
|
|
return 0, code, { '__file__' : file }
|
|
|
|
class DynLoadSuffixImporter(SuffixImporter):
|
|
def __init__(self, desc):
|
|
self.desc = desc
|
|
|
|
def import_file(self, filename, finfo, fqname):
|
|
fp = open(filename, self.desc[1])
|
|
module = imp.load_module(fqname, fp, filename, self.desc)
|
|
module.__file__ = filename
|
|
return 0, module, { }
|
|
|
|
|
|
######################################################################
|
|
|
|
def _test_dir():
|
|
"Debug/test function to create DirectoryImporters from sys.path."
|
|
path = sys.path[:]
|
|
path.reverse()
|
|
for d in path:
|
|
DirectoryImporter(d).install()
|
|
|
|
def _test_revamp():
|
|
"Debug/test function for the revamped import system."
|
|
PathImporter().install()
|
|
BuiltinImporter().install()
|
|
|
|
def _print_importers():
|
|
items = sys.modules.items()
|
|
items.sort()
|
|
for name, module in items:
|
|
if module:
|
|
print name, module.__dict__.get('__importer__', '-- no importer')
|
|
else:
|
|
print name, '-- non-existent module'
|
|
|
|
def _test_revamp():
|
|
ImportManager().install()
|
|
sys.path.insert(0, BuiltinImporter())
|
|
|
|
######################################################################
|