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#!/usr/bin/env python
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import ast
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import collections
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import os
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import sys
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# Import a minimal set of stdlib modules needed for list_stdlib_modules()
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# to work when run from a virtualenv. The modules were chosen empirically
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# so that the return value matches the return value without virtualenv.
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import BaseHTTPServer
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import zlib
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# Whitelist of modules that symbols can be directly imported from.
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allowsymbolimports = (
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'__future__',
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'mercurial.hgweb.common',
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'mercurial.hgweb.request',
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'mercurial.i18n',
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'mercurial.node',
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)
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# Modules that must be aliased because they are commonly confused with
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# common variables and can create aliasing and readability issues.
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requirealias = {
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'ui': 'uimod',
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}
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def usingabsolute(root):
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"""Whether absolute imports are being used."""
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if sys.version_info[0] >= 3:
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return True
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for node in ast.walk(root):
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if isinstance(node, ast.ImportFrom):
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if node.module == '__future__':
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for n in node.names:
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if n.name == 'absolute_import':
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return True
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return False
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def walklocal(root):
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"""Recursively yield all descendant nodes but not in a different scope"""
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todo = collections.deque(ast.iter_child_nodes(root))
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yield root, False
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while todo:
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node = todo.popleft()
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newscope = isinstance(node, ast.FunctionDef)
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if not newscope:
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todo.extend(ast.iter_child_nodes(node))
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yield node, newscope
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def dotted_name_of_path(path, trimpure=False):
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"""Given a relative path to a source file, return its dotted module name.
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>>> dotted_name_of_path('mercurial/error.py')
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'mercurial.error'
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>>> dotted_name_of_path('mercurial/pure/parsers.py', trimpure=True)
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'mercurial.parsers'
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>>> dotted_name_of_path('zlibmodule.so')
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'zlib'
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"""
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parts = path.replace(os.sep, '/').split('/')
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parts[-1] = parts[-1].split('.', 1)[0] # remove .py and .so and .ARCH.so
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if parts[-1].endswith('module'):
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parts[-1] = parts[-1][:-6]
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if trimpure:
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return '.'.join(p for p in parts if p != 'pure')
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return '.'.join(parts)
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def fromlocalfunc(modulename, localmods):
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"""Get a function to examine which locally defined module the
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target source imports via a specified name.
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`modulename` is an `dotted_name_of_path()`-ed source file path,
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which may have `.__init__` at the end of it, of the target source.
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`localmods` is a dict (or set), of which key is an absolute
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`dotted_name_of_path()`-ed source file path of locally defined (=
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Mercurial specific) modules.
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This function assumes that module names not existing in
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`localmods` are from the Python standard library.
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This function returns the function, which takes `name` argument,
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and returns `(absname, dottedpath, hassubmod)` tuple if `name`
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matches against locally defined module. Otherwise, it returns
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False.
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It is assumed that `name` doesn't have `.__init__`.
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`absname` is an absolute module name of specified `name`
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(e.g. "hgext.convert"). This can be used to compose prefix for sub
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modules or so.
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`dottedpath` is a `dotted_name_of_path()`-ed source file path
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(e.g. "hgext.convert.__init__") of `name`. This is used to look
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module up in `localmods` again.
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`hassubmod` is whether it may have sub modules under it (for
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convenient, even though this is also equivalent to "absname !=
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dottednpath")
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>>> localmods = {'foo.__init__': True, 'foo.foo1': True,
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... 'foo.bar.__init__': True, 'foo.bar.bar1': True,
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... 'baz.__init__': True, 'baz.baz1': True }
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>>> fromlocal = fromlocalfunc('foo.xxx', localmods)
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>>> # relative
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>>> fromlocal('foo1')
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('foo.foo1', 'foo.foo1', False)
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>>> fromlocal('bar')
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('foo.bar', 'foo.bar.__init__', True)
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>>> fromlocal('bar.bar1')
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('foo.bar.bar1', 'foo.bar.bar1', False)
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>>> # absolute
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>>> fromlocal('baz')
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('baz', 'baz.__init__', True)
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>>> fromlocal('baz.baz1')
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('baz.baz1', 'baz.baz1', False)
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>>> # unknown = maybe standard library
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>>> fromlocal('os')
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False
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>>> fromlocal(None, 1)
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('foo', 'foo.__init__', True)
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>>> fromlocal2 = fromlocalfunc('foo.xxx.yyy', localmods)
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>>> fromlocal2(None, 2)
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('foo', 'foo.__init__', True)
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"""
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prefix = '.'.join(modulename.split('.')[:-1])
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if prefix:
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prefix += '.'
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def fromlocal(name, level=0):
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# name is None when relative imports are used.
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if name is None:
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# If relative imports are used, level must not be absolute.
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assert level > 0
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candidates = ['.'.join(modulename.split('.')[:-level])]
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else:
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# Check relative name first.
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candidates = [prefix + name, name]
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for n in candidates:
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if n in localmods:
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return (n, n, False)
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dottedpath = n + '.__init__'
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if dottedpath in localmods:
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return (n, dottedpath, True)
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return False
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return fromlocal
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def list_stdlib_modules():
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"""List the modules present in the stdlib.
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>>> mods = set(list_stdlib_modules())
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>>> 'BaseHTTPServer' in mods
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True
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os.path isn't really a module, so it's missing:
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>>> 'os.path' in mods
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False
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sys requires special treatment, because it's baked into the
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interpreter, but it should still appear:
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>>> 'sys' in mods
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True
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>>> 'collections' in mods
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True
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>>> 'cStringIO' in mods
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True
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"""
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for m in sys.builtin_module_names:
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yield m
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# These modules only exist on windows, but we should always
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# consider them stdlib.
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for m in ['msvcrt', '_winreg']:
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yield m
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yield 'builtins' # python3 only
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for m in 'fcntl', 'grp', 'pwd', 'termios': # Unix only
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yield m
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stdlib_prefixes = set([sys.prefix, sys.exec_prefix])
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# We need to supplement the list of prefixes for the search to work
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# when run from within a virtualenv.
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for mod in (BaseHTTPServer, zlib):
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try:
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# Not all module objects have a __file__ attribute.
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filename = mod.__file__
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except AttributeError:
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continue
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dirname = os.path.dirname(filename)
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for prefix in stdlib_prefixes:
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if dirname.startswith(prefix):
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# Then this directory is redundant.
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break
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else:
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stdlib_prefixes.add(dirname)
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for libpath in sys.path:
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# We want to walk everything in sys.path that starts with
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# something in stdlib_prefixes. check-code suppressed because
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# the ast module used by this script implies the availability
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# of any().
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if not any(libpath.startswith(p) for p in stdlib_prefixes): # no-py24
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continue
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for top, dirs, files in os.walk(libpath):
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for i, d in reversed(list(enumerate(dirs))):
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if (not os.path.exists(os.path.join(top, d, '__init__.py'))
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or top == libpath and d in ('hgext', 'mercurial')):
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del dirs[i]
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for name in files:
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if not name.endswith(('.py', '.so', '.pyc', '.pyo', '.pyd')):
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continue
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if name.startswith('__init__.py'):
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full_path = top
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else:
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full_path = os.path.join(top, name)
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rel_path = full_path[len(libpath) + 1:]
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mod = dotted_name_of_path(rel_path)
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yield mod
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stdlib_modules = set(list_stdlib_modules())
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def imported_modules(source, modulename, localmods, ignore_nested=False):
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"""Given the source of a file as a string, yield the names
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imported by that file.
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Args:
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source: The python source to examine as a string.
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modulename: of specified python source (may have `__init__`)
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localmods: dict of locally defined module names (may have `__init__`)
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ignore_nested: If true, import statements that do not start in
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column zero will be ignored.
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Returns:
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A list of absolute module names imported by the given source.
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>>> modulename = 'foo.xxx'
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>>> localmods = {'foo.__init__': True,
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... 'foo.foo1': True, 'foo.foo2': True,
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... 'foo.bar.__init__': True, 'foo.bar.bar1': True,
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... 'baz.__init__': True, 'baz.baz1': True }
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>>> # standard library (= not locally defined ones)
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>>> sorted(imported_modules(
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... 'from stdlib1 import foo, bar; import stdlib2',
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... modulename, localmods))
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[]
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>>> # relative importing
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>>> sorted(imported_modules(
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... 'import foo1; from bar import bar1',
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... modulename, localmods))
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['foo.bar.bar1', 'foo.foo1']
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>>> sorted(imported_modules(
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... 'from bar.bar1 import name1, name2, name3',
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... modulename, localmods))
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['foo.bar.bar1']
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>>> # absolute importing
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>>> sorted(imported_modules(
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... 'from baz import baz1, name1',
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... modulename, localmods))
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['baz.__init__', 'baz.baz1']
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>>> # mixed importing, even though it shouldn't be recommended
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>>> sorted(imported_modules(
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... 'import stdlib, foo1, baz',
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... modulename, localmods))
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['baz.__init__', 'foo.foo1']
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>>> # ignore_nested
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>>> sorted(imported_modules(
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... '''import foo
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... def wat():
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... import bar
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... ''', modulename, localmods))
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['foo.__init__', 'foo.bar.__init__']
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>>> sorted(imported_modules(
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... '''import foo
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... def wat():
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... import bar
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... ''', modulename, localmods, ignore_nested=True))
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['foo.__init__']
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"""
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fromlocal = fromlocalfunc(modulename, localmods)
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for node in ast.walk(ast.parse(source)):
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if ignore_nested and getattr(node, 'col_offset', 0) > 0:
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continue
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if isinstance(node, ast.Import):
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for n in node.names:
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found = fromlocal(n.name)
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if not found:
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# this should import standard library
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continue
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yield found[1]
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elif isinstance(node, ast.ImportFrom):
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found = fromlocal(node.module, node.level)
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if not found:
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# this should import standard library
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continue
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absname, dottedpath, hassubmod = found
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if not hassubmod:
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# "dottedpath" is not a package; must be imported
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yield dottedpath
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# examination of "node.names" should be redundant
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# e.g.: from mercurial.node import nullid, nullrev
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continue
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modnotfound = False
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prefix = absname + '.'
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for n in node.names:
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found = fromlocal(prefix + n.name)
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if not found:
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# this should be a function or a property of "node.module"
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modnotfound = True
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continue
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yield found[1]
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if modnotfound:
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# "dottedpath" is a package, but imported because of non-module
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# lookup
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yield dottedpath
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def verify_import_convention(module, source, localmods):
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"""Verify imports match our established coding convention.
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We have 2 conventions: legacy and modern. The modern convention is in
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effect when using absolute imports.
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The legacy convention only looks for mixed imports. The modern convention
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is much more thorough.
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"""
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root = ast.parse(source)
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absolute = usingabsolute(root)
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if absolute:
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return verify_modern_convention(module, root, localmods)
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else:
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return verify_stdlib_on_own_line(root)
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def verify_modern_convention(module, root, localmods, root_col_offset=0):
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"""Verify a file conforms to the modern import convention rules.
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The rules of the modern convention are:
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* Ordering is stdlib followed by local imports. Each group is lexically
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sorted.
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* Importing multiple modules via "import X, Y" is not allowed: use
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separate import statements.
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* Importing multiple modules via "from X import ..." is allowed if using
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parenthesis and one entry per line.
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* Only 1 relative import statement per import level ("from .", "from ..")
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is allowed.
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* Relative imports from higher levels must occur before lower levels. e.g.
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"from .." must be before "from .".
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* Imports from peer packages should use relative import (e.g. do not
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"import mercurial.foo" from a "mercurial.*" module).
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* Symbols can only be imported from specific modules (see
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`allowsymbolimports`). For other modules, first import the module then
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assign the symbol to a module-level variable. In addition, these imports
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must be performed before other relative imports. This rule only
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applies to import statements outside of any blocks.
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* Relative imports from the standard library are not allowed.
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* Certain modules must be aliased to alternate names to avoid aliasing
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and readability problems. See `requirealias`.
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"""
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topmodule = module.split('.')[0]
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fromlocal = fromlocalfunc(module, localmods)
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# Whether a local/non-stdlib import has been performed.
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seenlocal = None
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# Whether a relative, non-symbol import has been seen.
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seennonsymbolrelative = False
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# The last name to be imported (for sorting).
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lastname = None
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# Relative import levels encountered so far.
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seenlevels = set()
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for node, newscope in walklocal(root):
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def msg(fmt, *args):
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return (fmt % args, node.lineno)
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if newscope:
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# Check for local imports in function
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for r in verify_modern_convention(module, node, localmods,
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node.col_offset + 4):
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yield r
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elif isinstance(node, ast.Import):
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# Disallow "import foo, bar" and require separate imports
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# for each module.
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if len(node.names) > 1:
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yield msg('multiple imported names: %s',
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', '.join(n.name for n in node.names))
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name = node.names[0].name
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asname = node.names[0].asname
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# Ignore sorting rules on imports inside blocks.
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if node.col_offset == root_col_offset:
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if lastname and name < lastname:
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yield msg('imports not lexically sorted: %s < %s',
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name, lastname)
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lastname = name
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# stdlib imports should be before local imports.
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stdlib = name in stdlib_modules
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if stdlib and seenlocal and node.col_offset == root_col_offset:
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yield msg('stdlib import "%s" follows local import: %s',
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name, seenlocal)
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if not stdlib:
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seenlocal = name
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# Import of sibling modules should use relative imports.
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topname = name.split('.')[0]
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if topname == topmodule:
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yield msg('import should be relative: %s', name)
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if name in requirealias and asname != requirealias[name]:
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yield msg('%s module must be "as" aliased to %s',
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name, requirealias[name])
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elif isinstance(node, ast.ImportFrom):
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# Resolve the full imported module name.
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if node.level > 0:
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fullname = '.'.join(module.split('.')[:-node.level])
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if node.module:
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fullname += '.%s' % node.module
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else:
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assert node.module
|
|
|
fullname = node.module
|
|
|
|
|
|
topname = fullname.split('.')[0]
|
|
|
if topname == topmodule:
|
|
|
yield msg('import should be relative: %s', fullname)
|
|
|
|
|
|
# __future__ is special since it needs to come first and use
|
|
|
# symbol import.
|
|
|
if fullname != '__future__':
|
|
|
if not fullname or fullname in stdlib_modules:
|
|
|
yield msg('relative import of stdlib module')
|
|
|
else:
|
|
|
seenlocal = fullname
|
|
|
|
|
|
# Direct symbol import is only allowed from certain modules and
|
|
|
# must occur before non-symbol imports.
|
|
|
if node.module and node.col_offset == root_col_offset:
|
|
|
found = fromlocal(node.module, node.level)
|
|
|
if found and found[2]: # node.module is a package
|
|
|
prefix = found[0] + '.'
|
|
|
symbols = [n.name for n in node.names
|
|
|
if not fromlocal(prefix + n.name)]
|
|
|
else:
|
|
|
symbols = [n.name for n in node.names]
|
|
|
|
|
|
if symbols and fullname not in allowsymbolimports:
|
|
|
yield msg('direct symbol import %s from %s',
|
|
|
', '.join(symbols), fullname)
|
|
|
|
|
|
if symbols and seennonsymbolrelative:
|
|
|
yield msg('symbol import follows non-symbol import: %s',
|
|
|
fullname)
|
|
|
|
|
|
if not node.module:
|
|
|
assert node.level
|
|
|
seennonsymbolrelative = True
|
|
|
|
|
|
# Only allow 1 group per level.
|
|
|
if (node.level in seenlevels
|
|
|
and node.col_offset == root_col_offset):
|
|
|
yield msg('multiple "from %s import" statements',
|
|
|
'.' * node.level)
|
|
|
|
|
|
# Higher-level groups come before lower-level groups.
|
|
|
if any(node.level > l for l in seenlevels):
|
|
|
yield msg('higher-level import should come first: %s',
|
|
|
fullname)
|
|
|
|
|
|
seenlevels.add(node.level)
|
|
|
|
|
|
# Entries in "from .X import ( ... )" lists must be lexically
|
|
|
# sorted.
|
|
|
lastentryname = None
|
|
|
|
|
|
for n in node.names:
|
|
|
if lastentryname and n.name < lastentryname:
|
|
|
yield msg('imports from %s not lexically sorted: %s < %s',
|
|
|
fullname, n.name, lastentryname)
|
|
|
|
|
|
lastentryname = n.name
|
|
|
|
|
|
if n.name in requirealias and n.asname != requirealias[n.name]:
|
|
|
yield msg('%s from %s must be "as" aliased to %s',
|
|
|
n.name, fullname, requirealias[n.name])
|
|
|
|
|
|
def verify_stdlib_on_own_line(root):
|
|
|
"""Given some python source, verify that stdlib imports are done
|
|
|
in separate statements from relative local module imports.
|
|
|
|
|
|
Observing this limitation is important as it works around an
|
|
|
annoying lib2to3 bug in relative import rewrites:
|
|
|
http://bugs.python.org/issue19510.
|
|
|
|
|
|
>>> list(verify_stdlib_on_own_line(ast.parse('import sys, foo')))
|
|
|
[('mixed imports\\n stdlib: sys\\n relative: foo', 1)]
|
|
|
>>> list(verify_stdlib_on_own_line(ast.parse('import sys, os')))
|
|
|
[]
|
|
|
>>> list(verify_stdlib_on_own_line(ast.parse('import foo, bar')))
|
|
|
[]
|
|
|
"""
|
|
|
for node in ast.walk(root):
|
|
|
if isinstance(node, ast.Import):
|
|
|
from_stdlib = {False: [], True: []}
|
|
|
for n in node.names:
|
|
|
from_stdlib[n.name in stdlib_modules].append(n.name)
|
|
|
if from_stdlib[True] and from_stdlib[False]:
|
|
|
yield ('mixed imports\n stdlib: %s\n relative: %s' %
|
|
|
(', '.join(sorted(from_stdlib[True])),
|
|
|
', '.join(sorted(from_stdlib[False]))), node.lineno)
|
|
|
|
|
|
class CircularImport(Exception):
|
|
|
pass
|
|
|
|
|
|
def checkmod(mod, imports):
|
|
|
shortest = {}
|
|
|
visit = [[mod]]
|
|
|
while visit:
|
|
|
path = visit.pop(0)
|
|
|
for i in sorted(imports.get(path[-1], [])):
|
|
|
if len(path) < shortest.get(i, 1000):
|
|
|
shortest[i] = len(path)
|
|
|
if i in path:
|
|
|
if i == path[0]:
|
|
|
raise CircularImport(path)
|
|
|
continue
|
|
|
visit.append(path + [i])
|
|
|
|
|
|
def rotatecycle(cycle):
|
|
|
"""arrange a cycle so that the lexicographically first module listed first
|
|
|
|
|
|
>>> rotatecycle(['foo', 'bar'])
|
|
|
['bar', 'foo', 'bar']
|
|
|
"""
|
|
|
lowest = min(cycle)
|
|
|
idx = cycle.index(lowest)
|
|
|
return cycle[idx:] + cycle[:idx] + [lowest]
|
|
|
|
|
|
def find_cycles(imports):
|
|
|
"""Find cycles in an already-loaded import graph.
|
|
|
|
|
|
All module names recorded in `imports` should be absolute one.
|
|
|
|
|
|
>>> imports = {'top.foo': ['top.bar', 'os.path', 'top.qux'],
|
|
|
... 'top.bar': ['top.baz', 'sys'],
|
|
|
... 'top.baz': ['top.foo'],
|
|
|
... 'top.qux': ['top.foo']}
|
|
|
>>> print '\\n'.join(sorted(find_cycles(imports)))
|
|
|
top.bar -> top.baz -> top.foo -> top.bar
|
|
|
top.foo -> top.qux -> top.foo
|
|
|
"""
|
|
|
cycles = set()
|
|
|
for mod in sorted(imports.iterkeys()):
|
|
|
try:
|
|
|
checkmod(mod, imports)
|
|
|
except CircularImport as e:
|
|
|
cycle = e.args[0]
|
|
|
cycles.add(" -> ".join(rotatecycle(cycle)))
|
|
|
return cycles
|
|
|
|
|
|
def _cycle_sortkey(c):
|
|
|
return len(c), c
|
|
|
|
|
|
def main(argv):
|
|
|
if len(argv) < 2 or (argv[1] == '-' and len(argv) > 2):
|
|
|
print 'Usage: %s {-|file [file] [file] ...}'
|
|
|
return 1
|
|
|
if argv[1] == '-':
|
|
|
argv = argv[:1]
|
|
|
argv.extend(l.rstrip() for l in sys.stdin.readlines())
|
|
|
localmods = {}
|
|
|
used_imports = {}
|
|
|
any_errors = False
|
|
|
for source_path in argv[1:]:
|
|
|
modname = dotted_name_of_path(source_path, trimpure=True)
|
|
|
localmods[modname] = source_path
|
|
|
for modname, source_path in sorted(localmods.iteritems()):
|
|
|
f = open(source_path)
|
|
|
src = f.read()
|
|
|
used_imports[modname] = sorted(
|
|
|
imported_modules(src, modname, localmods, ignore_nested=True))
|
|
|
for error, lineno in verify_import_convention(modname, src, localmods):
|
|
|
any_errors = True
|
|
|
print '%s:%d: %s' % (source_path, lineno, error)
|
|
|
f.close()
|
|
|
cycles = find_cycles(used_imports)
|
|
|
if cycles:
|
|
|
firstmods = set()
|
|
|
for c in sorted(cycles, key=_cycle_sortkey):
|
|
|
first = c.split()[0]
|
|
|
# As a rough cut, ignore any cycle that starts with the
|
|
|
# same module as some other cycle. Otherwise we see lots
|
|
|
# of cycles that are effectively duplicates.
|
|
|
if first in firstmods:
|
|
|
continue
|
|
|
print 'Import cycle:', c
|
|
|
firstmods.add(first)
|
|
|
any_errors = True
|
|
|
return any_errors != 0
|
|
|
|
|
|
if __name__ == '__main__':
|
|
|
sys.exit(int(main(sys.argv)))
|
|
|
|
