[PATCH 5 of 6] import-checker: remove useless stdlib_modules and related code paths

[FUJIWARA Katsunori]

# HG changeset patch
# User FUJIWARA Katsunori <foozy at lares.dti.ne.jp>
# Date 1431535750 -32400
#      Thu May 14 01:49:10 2015 +0900
# Node ID 28a977036067ea7bb0af50218edbee9abe82331a
# Parent  9b0ee3a4e1c6ca73bd12c0d7ab16b066c807428c
import-checker: remove useless stdlib_modules and related code paths

Previous patches make "stdlib_modules" useless.

diff --git a/contrib/import-checker.py b/contrib/import-checker.py
--- a/contrib/import-checker.py
+++ b/contrib/import-checker.py
@@ -1,13 +1,6 @@
 import ast
-import os
 import sys
 
-# Import a minimal set of stdlib modules needed for list_stdlib_modules()
-# to work when run from a virtualenv.  The modules were chosen empirically
-# so that the return value matches the return value without virtualenv.
-import BaseHTTPServer
-import zlib
-
 def dotted_name_of_path(path, trimpure=False):
     """Given a relative path to a source file, return its dotted module name.
 
@@ -27,83 +20,6 @@ def dotted_name_of_path(path, trimpure=F
     return '.'.join(parts)
 
 
-def list_stdlib_modules():
-    """List the modules present in the stdlib.
-
-    >>> mods = set(list_stdlib_modules())
-    >>> 'BaseHTTPServer' in mods
-    True
-
-    os.path isn't really a module, so it's missing:
-
-    >>> 'os.path' in mods
-    False
-
-    sys requires special treatment, because it's baked into the
-    interpreter, but it should still appear:
-
-    >>> 'sys' in mods
-    True
-
-    >>> 'collections' in mods
-    True
-
-    >>> 'cStringIO' in mods
-    True
-    """
-    for m in sys.builtin_module_names:
-        yield m
-    # These modules only exist on windows, but we should always
-    # consider them stdlib.
-    for m in ['msvcrt', '_winreg']:
-        yield m
-    # These get missed too
-    for m in 'ctypes', 'email':
-        yield m
-    yield 'builtins' # python3 only
-    for m in 'fcntl', 'grp', 'pwd', 'termios':  # Unix only
-        yield m
-    stdlib_prefixes = set([sys.prefix, sys.exec_prefix])
-    # We need to supplement the list of prefixes for the search to work
-    # when run from within a virtualenv.
-    for mod in (BaseHTTPServer, zlib):
-        try:
-            # Not all module objects have a __file__ attribute.
-            filename = mod.__file__
-        except AttributeError:
-            continue
-        dirname = os.path.dirname(filename)
-        for prefix in stdlib_prefixes:
-            if dirname.startswith(prefix):
-                # Then this directory is redundant.
-                break
-        else:
-            stdlib_prefixes.add(dirname)
-    for libpath in sys.path:
-        # We want to walk everything in sys.path that starts with
-        # something in stdlib_prefixes. check-code suppressed because
-        # the ast module used by this script implies the availability
-        # of any().
-        if not any(libpath.startswith(p) for p in stdlib_prefixes): # no-py24
-            continue
-        if 'site-packages' in libpath:
-            continue
-        for top, dirs, files in os.walk(libpath):
-            for name in files:
-                if name == '__init__.py':
-                    continue
-                if not (name.endswith('.py') or name.endswith('.so')
-                        or name.endswith('.pyd')):
-                    continue
-                full_path = os.path.join(top, name)
-                if 'site-packages' in full_path:
-                    continue
-                rel_path = full_path[len(libpath) + 1:]
-                mod = dotted_name_of_path(rel_path)
-                yield mod
-
-stdlib_modules = set(list_stdlib_modules())
-
 def imported_modules(source, ignore_nested=False):
     """Given the source of a file as a string, yield the names
     imported by that file.