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File: ihooks.pyc
� ӫ[c @ s� d Z d d l m Z m Z e d d d �[ d d l Z d d l Z d d l Z d d l Z d d d d d d d d g Z d Z d d l m Z m Z m Z d d l m Z m Z m Z e Z e Z d d d � � YZ d e f d � � YZ d e f d � � YZ d e f d � � YZ d e f d � � YZ d e f d � � YZ d e f d � � YZ d Z d a d d � Z d � Z d S( s, Import hook support. Consistent use of this module will make it possible to change the different mechanisms involved in loading modules independently. While the built-in module imp exports interfaces to the built-in module searching and loading algorithm, and it is possible to replace the built-in function __import__ in order to change the semantics of the import statement, until now it has been difficult to combine the effect of different __import__ hacks, like loading modules from URLs by rimport.py, or restricted execution by rexec.py. This module defines three new concepts: 1) A "file system hooks" class provides an interface to a filesystem. One hooks class is defined (Hooks), which uses the interface provided by standard modules os and os.path. It should be used as the base class for other hooks classes. 2) A "module loader" class provides an interface to search for a module in a search path and to load it. It defines a method which searches for a module in a single directory; by overriding this method one can redefine the details of the search. If the directory is None, built-in and frozen modules are searched instead. Two module loader class are defined, both implementing the search strategy used by the built-in __import__ function: ModuleLoader uses the imp module's find_module interface, while HookableModuleLoader uses a file system hooks class to interact with the file system. Both use the imp module's load_* interfaces to actually load the module. 3) A "module importer" class provides an interface to import a module, as well as interfaces to reload and unload a module. It also provides interfaces to install and uninstall itself instead of the default __import__ and reload (and unload) functions. One module importer class is defined (ModuleImporter), which uses a module loader instance passed in (by default HookableModuleLoader is instantiated). The classes defined here should be used as base classes for extended functionality along those lines. If a module importer class supports dotted names, its import_module() must return a different value depending on whether it is called on behalf of a "from ... import ..." statement or not. (This is caused by the way the __import__ hook is used by the Python interpreter.) It would also do wise to install a different version of reload(). i����( t warnpy3kt warns0 the ihooks module has been removed in Python 3.0t stackleveli Nt BasicModuleLoadert Hookst ModuleLoadert FancyModuleLoadert BasicModuleImportert ModuleImportert installt uninstalli ( t C_EXTENSIONt PY_SOURCEt PY_COMPILED( t C_BUILTINt PY_FROZENt PKG_DIRECTORYt _Verbosec B s8 e Z e d � Z d � Z d � Z d � Z d � Z RS( c C s | | _ d S( N( t verbose( t selfR ( ( s /usr/lib/python2.7/ihooks.pyt __init__K s c C s | j S( N( R ( R ( ( s /usr/lib/python2.7/ihooks.pyt get_verboseN s c C s | | _ d S( N( R ( R R ( ( s /usr/lib/python2.7/ihooks.pyt set_verboseQ s c G s | j r | j | � n d S( N( R t message( R t args( ( s /usr/lib/python2.7/ihooks.pyt noteV s c G s | r | | GHn | GHd S( N( ( R t formatR ( ( s /usr/lib/python2.7/ihooks.pyR Z s ( t __name__t __module__t VERBOSER R R R R ( ( ( s /usr/lib/python2.7/ihooks.pyR I s c B s> e Z d Z d d � Z d � Z d � Z d � Z d � Z RS( s; Basic module loader. This provides the same functionality as built-in import. It doesn't deal with checking sys.modules -- all it provides is find_module() and a load_module(), as well as find_module_in_dir() which searches just one directory, and can be overridden by a derived class to change the module search algorithm when the basic dependency on sys.path is unchanged. The interface is a little more convenient than imp's: find_module(name, [path]) returns None or 'stuff', and load_module(name, stuff) loads the module. c C sS | d k r" d g | j � } n x* | D]" } | j | | � } | r) | Sq) Wd S( N( t Nonet default_patht find_module_in_dir( R t namet patht dirt stuff( ( s /usr/lib/python2.7/ihooks.pyt find_moduler s c C s t j S( N( t sysR" ( R ( ( s /usr/lib/python2.7/ihooks.pyR z s c C sI | d k r | j | � Sy t j | | g � SWn t k rD d SXd S( N( R t find_builtin_modulet impR% t ImportError( R R! R# ( ( s /usr/lib/python2.7/ihooks.pyR } s c C sN t j | � r% d d d d t f f St j | � rJ d d d d t f f Sd S( Nt ( R( t is_builtinR t BUILTIN_MODULEt is_frozent FROZEN_MODULE( R R! ( ( s /usr/lib/python2.7/ihooks.pyR' � s c C sD | \ } } } z t j | | | | � SWd | r? | j � n Xd S( N( R( t load_modulet close( R R! R$ t filet filenamet info( ( s /usr/lib/python2.7/ihooks.pyR/ � s N( R R t __doc__R R% R R R' R/ ( ( ( s /usr/lib/python2.7/ihooks.pyR a s c B s� e Z d Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z d d � Z d d � Z d d � Z d d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z d � Z e Z d � Z e j Z RS( s� Hooks into the filesystem and interpreter. By deriving a subclass you can redefine your filesystem interface, e.g. to merge it with the URL space. This base class behaves just like the native filesystem. c C s t j � S( N( R( t get_suffixes( R ( ( s /usr/lib/python2.7/ihooks.pyR5 � s c C s t j | � S( N( R( t new_module( R R! ( ( s /usr/lib/python2.7/ihooks.pyR6 � s c C s t j | � S( N( R( R+ ( R R! ( ( s /usr/lib/python2.7/ihooks.pyR+ � s c C s t j | � S( N( R( t init_builtin( R R! ( ( s /usr/lib/python2.7/ihooks.pyR7 � s c C s t j | � S( N( R( R- ( R R! ( ( s /usr/lib/python2.7/ihooks.pyR- � s c C s t j | � S( N( R( t init_frozen( R R! ( ( s /usr/lib/python2.7/ihooks.pyR8 � s c C s t j | � S( N( R( t get_frozen_object( R R! ( ( s /usr/lib/python2.7/ihooks.pyR9 � s c C s t j | | | � S( N( R( t load_source( R R! R2 R1 ( ( s /usr/lib/python2.7/ihooks.pyR: � s c C s t j | | | � S( N( R( t load_compiled( R R! R2 R1 ( ( s /usr/lib/python2.7/ihooks.pyR; � s c C s t j | | | � S( N( R( t load_dynamic( R R! R2 R1 ( ( s /usr/lib/python2.7/ihooks.pyR<