|
|
#!/usr/bin/env python
|
|
|
|
|
|
from __future__ import absolute_import, print_function
|
|
|
|
|
|
import ast
|
|
|
import collections
|
|
|
import os
|
|
|
import re
|
|
|
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.
|
|
|
if True: # disable lexical sorting checks
|
|
|
import BaseHTTPServer
|
|
|
import zlib
|
|
|
|
|
|
# Whitelist of modules that symbols can be directly imported from.
|
|
|
allowsymbolimports = (
|
|
|
'__future__',
|
|
|
'mercurial.hgweb.common',
|
|
|
'mercurial.hgweb.request',
|
|
|
'mercurial.i18n',
|
|
|
'mercurial.node',
|
|
|
)
|
|
|
|
|
|
# Modules that must be aliased because they are commonly confused with
|
|
|
# common variables and can create aliasing and readability issues.
|
|
|
requirealias = {
|
|
|
'ui': 'uimod',
|
|
|
}
|
|
|
|
|
|
def usingabsolute(root):
|
|
|
"""Whether absolute imports are being used."""
|
|
|
if sys.version_info[0] >= 3:
|
|
|
return True
|
|
|
|
|
|
for node in ast.walk(root):
|
|
|
if isinstance(node, ast.ImportFrom):
|
|
|
if node.module == '__future__':
|
|
|
for n in node.names:
|
|
|
if n.name == 'absolute_import':
|
|
|
return True
|
|
|
|
|
|
return False
|
|
|
|
|
|
def walklocal(root):
|
|
|
"""Recursively yield all descendant nodes but not in a different scope"""
|
|
|
todo = collections.deque(ast.iter_child_nodes(root))
|
|
|
yield root, False
|
|
|
while todo:
|
|
|
node = todo.popleft()
|
|
|
newscope = isinstance(node, ast.FunctionDef)
|
|
|
if not newscope:
|
|
|
todo.extend(ast.iter_child_nodes(node))
|
|
|
yield node, newscope
|
|
|
|
|
|
def dotted_name_of_path(path, trimpure=False):
|
|
|
"""Given a relative path to a source file, return its dotted module name.
|
|
|
|
|
|
>>> dotted_name_of_path('mercurial/error.py')
|
|
|
'mercurial.error'
|
|
|
>>> dotted_name_of_path('mercurial/pure/parsers.py', trimpure=True)
|
|
|
'mercurial.parsers'
|
|
|
>>> dotted_name_of_path('zlibmodule.so')
|
|
|
'zlib'
|
|
|
"""
|
|
|
parts = path.replace(os.sep, '/').split('/')
|
|
|
parts[-1] = parts[-1].split('.', 1)[0] # remove .py and .so and .ARCH.so
|
|
|
if parts[-1].endswith('module'):
|
|
|
parts[-1] = parts[-1][:-6]
|
|
|
if trimpure:
|
|
|
return '.'.join(p for p in parts if p != 'pure')
|
|
|
return '.'.join(parts)
|
|
|
|
|
|
def fromlocalfunc(modulename, localmods):
|
|
|
"""Get a function to examine which locally defined module the
|
|
|
target source imports via a specified name.
|
|
|
|
|
|
`modulename` is an `dotted_name_of_path()`-ed source file path,
|
|
|
which may have `.__init__` at the end of it, of the target source.
|
|
|
|
|
|
`localmods` is a dict (or set), of which key is an absolute
|
|
|
`dotted_name_of_path()`-ed source file path of locally defined (=
|
|
|
Mercurial specific) modules.
|
|
|
|
|
|
This function assumes that module names not existing in
|
|
|
`localmods` are from the Python standard library.
|
|
|
|
|
|
This function returns the function, which takes `name` argument,
|
|
|
and returns `(absname, dottedpath, hassubmod)` tuple if `name`
|
|
|
matches against locally defined module. Otherwise, it returns
|
|
|
False.
|
|
|
|
|
|
It is assumed that `name` doesn't have `.__init__`.
|
|
|
|
|
|
`absname` is an absolute module name of specified `name`
|
|
|
(e.g. "hgext.convert"). This can be used to compose prefix for sub
|
|
|
modules or so.
|
|
|
|
|
|
`dottedpath` is a `dotted_name_of_path()`-ed source file path
|
|
|
(e.g. "hgext.convert.__init__") of `name`. This is used to look
|
|
|
module up in `localmods` again.
|
|
|
|
|
|
`hassubmod` is whether it may have sub modules under it (for
|
|
|
convenient, even though this is also equivalent to "absname !=
|
|
|
dottednpath")
|
|
|
|
|
|
>>> localmods = {'foo.__init__': True, 'foo.foo1': True,
|
|
|
... 'foo.bar.__init__': True, 'foo.bar.bar1': True,
|
|
|
... 'baz.__init__': True, 'baz.baz1': True }
|
|
|
>>> fromlocal = fromlocalfunc('foo.xxx', localmods)
|
|
|
>>> # relative
|
|
|
>>> fromlocal('foo1')
|
|
|
('foo.foo1', 'foo.foo1', False)
|
|
|
>>> fromlocal('bar')
|
|
|
('foo.bar', 'foo.bar.__init__', True)
|
|
|
>>> fromlocal('bar.bar1')
|
|
|
('foo.bar.bar1', 'foo.bar.bar1', False)
|
|
|
>>> # absolute
|
|
|
>>> fromlocal('baz')
|
|
|
('baz', 'baz.__init__', True)
|
|
|
>>> fromlocal('baz.baz1')
|
|
|
('baz.baz1', 'baz.baz1', False)
|
|
|
>>> # unknown = maybe standard library
|
|
|
>>> fromlocal('os')
|
|
|
False
|
|
|
>>> fromlocal(None, 1)
|
|
|
('foo', 'foo.__init__', True)
|
|
|
>>> fromlocal('foo1', 1)
|
|
|
('foo.foo1', 'foo.foo1', False)
|
|
|
>>> fromlocal2 = fromlocalfunc('foo.xxx.yyy', localmods)
|
|
|
>>> fromlocal2(None, 2)
|
|
|
('foo', 'foo.__init__', True)
|
|
|
>>> fromlocal2('bar2', 1)
|
|
|
False
|
|
|
>>> fromlocal2('bar', 2)
|
|
|
('foo.bar', 'foo.bar.__init__', True)
|
|
|
"""
|
|
|
prefix = '.'.join(modulename.split('.')[:-1])
|
|
|
if prefix:
|
|
|
prefix += '.'
|
|
|
def fromlocal(name, level=0):
|
|
|
# name is false value when relative imports are used.
|
|
|
if not name:
|
|
|
# If relative imports are used, level must not be absolute.
|
|
|
assert level > 0
|
|
|
candidates = ['.'.join(modulename.split('.')[:-level])]
|
|
|
else:
|
|
|
if not level:
|
|
|
# Check relative name first.
|
|
|
candidates = [prefix + name, name]
|
|
|
else:
|
|
|
candidates = ['.'.join(modulename.split('.')[:-level]) +
|
|
|
'.' + name]
|
|
|
|
|
|
for n in candidates:
|
|
|
if n in localmods:
|
|
|
return (n, n, False)
|
|
|
dottedpath = n + '.__init__'
|
|
|
if dottedpath in localmods:
|
|
|
return (n, dottedpath, True)
|
|
|
return False
|
|
|
return fromlocal
|
|
|
|
|
|
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
|
|
|
|
|
|
>>> 'cffi' 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
|
|
|
yield 'builtins' # python3 only
|
|
|
for m in 'fcntl', 'grp', 'pwd', 'termios': # Unix only
|
|
|
yield m
|
|
|
for m in 'cPickle', 'datetime': # in Python (not C) on PyPy
|
|
|
yield m
|
|
|
for m in ['cffi']:
|
|
|
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.
|
|
|
if not any(libpath.startswith(p) for p in stdlib_prefixes):
|
|
|
continue
|
|
|
for top, dirs, files in os.walk(libpath):
|
|
|
for i, d in reversed(list(enumerate(dirs))):
|
|
|
if (not os.path.exists(os.path.join(top, d, '__init__.py'))
|
|
|
or top == libpath and d in ('hgext', 'mercurial')):
|
|
|
del dirs[i]
|
|
|
for name in files:
|
|
|
if not name.endswith(('.py', '.so', '.pyc', '.pyo', '.pyd')):
|
|
|
continue
|
|
|
if name.startswith('__init__.py'):
|
|
|
full_path = top
|
|
|
else:
|
|
|
full_path = os.path.join(top, name)
|
|
|
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, modulename, f, localmods, ignore_nested=False):
|
|
|
"""Given the source of a file as a string, yield the names
|
|
|
imported by that file.
|
|
|
|
|
|
Args:
|
|
|
source: The python source to examine as a string.
|
|
|
modulename: of specified python source (may have `__init__`)
|
|
|
localmods: dict of locally defined module names (may have `__init__`)
|
|
|
ignore_nested: If true, import statements that do not start in
|
|
|
column zero will be ignored.
|
|
|
|
|
|
Returns:
|
|
|
A list of absolute module names imported by the given source.
|
|
|
|
|
|
>>> f = 'foo/xxx.py'
|
|
|
>>> modulename = 'foo.xxx'
|
|
|
>>> localmods = {'foo.__init__': True,
|
|
|
... 'foo.foo1': True, 'foo.foo2': True,
|
|
|
... 'foo.bar.__init__': True, 'foo.bar.bar1': True,
|
|
|
... 'baz.__init__': True, 'baz.baz1': True }
|
|
|
>>> # standard library (= not locally defined ones)
|
|
|
>>> sorted(imported_modules(
|
|
|
... 'from stdlib1 import foo, bar; import stdlib2',
|
|
|
... modulename, f, localmods))
|
|
|
[]
|
|
|
>>> # relative importing
|
|
|
>>> sorted(imported_modules(
|
|
|
... 'import foo1; from bar import bar1',
|
|
|
... modulename, f, localmods))
|
|
|
['foo.bar.bar1', 'foo.foo1']
|
|
|
>>> sorted(imported_modules(
|
|
|
... 'from bar.bar1 import name1, name2, name3',
|
|
|
... modulename, f, localmods))
|
|
|
['foo.bar.bar1']
|
|
|
>>> # absolute importing
|
|
|
>>> sorted(imported_modules(
|
|
|
... 'from baz import baz1, name1',
|
|
|
... modulename, f, localmods))
|
|
|
['baz.__init__', 'baz.baz1']
|
|
|
>>> # mixed importing, even though it shouldn't be recommended
|
|
|
>>> sorted(imported_modules(
|
|
|
... 'import stdlib, foo1, baz',
|
|
|
... modulename, f, localmods))
|
|
|
['baz.__init__', 'foo.foo1']
|
|
|
>>> # ignore_nested
|
|
|
>>> sorted(imported_modules(
|
|
|
... '''import foo
|
|
|
... def wat():
|
|
|
... import bar
|
|
|
... ''', modulename, f, localmods))
|
|
|
['foo.__init__', 'foo.bar.__init__']
|
|
|
>>> sorted(imported_modules(
|
|
|
... '''import foo
|
|
|
... def wat():
|
|
|
... import bar
|
|
|
... ''', modulename, f, localmods, ignore_nested=True))
|
|
|
['foo.__init__']
|
|
|
"""
|
|
|
fromlocal = fromlocalfunc(modulename, localmods)
|
|
|
for node in ast.walk(ast.parse(source, f)):
|
|
|
if ignore_nested and getattr(node, 'col_offset', 0) > 0:
|
|
|
continue
|
|
|
if isinstance(node, ast.Import):
|
|
|
for n in node.names:
|
|
|
found = fromlocal(n.name)
|
|
|
if not found:
|
|
|
# this should import standard library
|
|
|
continue
|
|
|
yield found[1]
|
|
|
elif isinstance(node, ast.ImportFrom):
|
|
|
found = fromlocal(node.module, node.level)
|
|
|
if not found:
|
|
|
# this should import standard library
|
|
|
continue
|
|
|
|
|
|
absname, dottedpath, hassubmod = found
|
|
|
if not hassubmod:
|
|
|
# "dottedpath" is not a package; must be imported
|
|
|
yield dottedpath
|
|
|
# examination of "node.names" should be redundant
|
|
|
# e.g.: from mercurial.node import nullid, nullrev
|
|
|
continue
|
|
|
|
|
|
modnotfound = False
|
|
|
prefix = absname + '.'
|
|
|
for n in node.names:
|
|
|
found = fromlocal(prefix + n.name)
|
|
|
if not found:
|
|
|
# this should be a function or a property of "node.module"
|
|
|
modnotfound = True
|
|
|
continue
|
|
|
yield found[1]
|
|
|
if modnotfound:
|
|
|
# "dottedpath" is a package, but imported because of non-module
|
|
|
# lookup
|
|
|
yield dottedpath
|
|
|
|
|
|
def verify_import_convention(module, source, localmods):
|
|
|
"""Verify imports match our established coding convention.
|
|
|
|
|
|
We have 2 conventions: legacy and modern. The modern convention is in
|
|
|
effect when using absolute imports.
|
|
|
|
|
|
The legacy convention only looks for mixed imports. The modern convention
|
|
|
is much more thorough.
|
|
|
"""
|
|
|
root = ast.parse(source)
|
|
|
absolute = usingabsolute(root)
|
|
|
|
|
|
if absolute:
|
|
|
return verify_modern_convention(module, root, localmods)
|
|
|
else:
|
|
|
return verify_stdlib_on_own_line(root)
|
|
|
|
|
|
def verify_modern_convention(module, root, localmods, root_col_offset=0):
|
|
|
"""Verify a file conforms to the modern import convention rules.
|
|
|
|
|
|
The rules of the modern convention are:
|
|
|
|
|
|
* Ordering is stdlib followed by local imports. Each group is lexically
|
|
|
sorted.
|
|
|
* Importing multiple modules via "import X, Y" is not allowed: use
|
|
|
separate import statements.
|
|
|
* Importing multiple modules via "from X import ..." is allowed if using
|
|
|
parenthesis and one entry per line.
|
|
|
* Only 1 relative import statement per import level ("from .", "from ..")
|
|
|
is allowed.
|
|
|
* Relative imports from higher levels must occur before lower levels. e.g.
|
|
|
"from .." must be before "from .".
|
|
|
* Imports from peer packages should use relative import (e.g. do not
|
|
|
"import mercurial.foo" from a "mercurial.*" module).
|
|
|
* Symbols can only be imported from specific modules (see
|
|
|
`allowsymbolimports`). For other modules, first import the module then
|
|
|
assign the symbol to a module-level variable. In addition, these imports
|
|
|
must be performed before other local imports. This rule only
|
|
|
applies to import statements outside of any blocks.
|
|
|
* Relative imports from the standard library are not allowed.
|
|
|
* Certain modules must be aliased to alternate names to avoid aliasing
|
|
|
and readability problems. See `requirealias`.
|
|
|
"""
|
|
|
topmodule = module.split('.')[0]
|
|
|
fromlocal = fromlocalfunc(module, localmods)
|
|
|
|
|
|
# Whether a local/non-stdlib import has been performed.
|
|
|
seenlocal = None
|
|
|
# Whether a local/non-stdlib, non-symbol import has been seen.
|
|
|
seennonsymbollocal = False
|
|
|
# The last name to be imported (for sorting).
|
|
|
lastname = None
|
|
|
laststdlib = None
|
|
|
# Relative import levels encountered so far.
|
|
|
seenlevels = set()
|
|
|
|
|
|
for node, newscope in walklocal(root):
|
|
|
def msg(fmt, *args):
|
|
|
return (fmt % args, node.lineno)
|
|
|
if newscope:
|
|
|
# Check for local imports in function
|
|
|
for r in verify_modern_convention(module, node, localmods,
|
|
|
node.col_offset + 4):
|
|
|
yield r
|
|
|
elif isinstance(node, ast.Import):
|
|
|
# Disallow "import foo, bar" and require separate imports
|
|
|
# for each module.
|
|
|
if len(node.names) > 1:
|
|
|
yield msg('multiple imported names: %s',
|
|
|
', '.join(n.name for n in node.names))
|
|
|
|
|
|
name = node.names[0].name
|
|
|
asname = node.names[0].asname
|
|
|
|
|
|
stdlib = name in stdlib_modules
|
|
|
|
|
|
# Ignore sorting rules on imports inside blocks.
|
|
|
if node.col_offset == root_col_offset:
|
|
|
if lastname and name < lastname and laststdlib == stdlib:
|
|
|
yield msg('imports not lexically sorted: %s < %s',
|
|
|
name, lastname)
|
|
|
|
|
|
lastname = name
|
|
|
laststdlib = stdlib
|
|
|
|
|
|
# stdlib imports should be before local imports.
|
|
|
if stdlib and seenlocal and node.col_offset == root_col_offset:
|
|
|
yield msg('stdlib import "%s" follows local import: %s',
|
|
|
name, seenlocal)
|
|
|
|
|
|
if not stdlib:
|
|
|
seenlocal = name
|
|
|
|
|
|
# Import of sibling modules should use relative imports.
|
|
|
topname = name.split('.')[0]
|
|
|
if topname == topmodule:
|
|
|
yield msg('import should be relative: %s', name)
|
|
|
|
|
|
if name in requirealias and asname != requirealias[name]:
|
|
|
yield msg('%s module must be "as" aliased to %s',
|
|
|
name, requirealias[name])
|
|
|
|
|
|
elif isinstance(node, ast.ImportFrom):
|
|
|
# Resolve the full imported module name.
|
|
|
if node.level > 0:
|
|
|
fullname = '.'.join(module.split('.')[:-node.level])
|
|
|
if node.module:
|
|
|
fullname += '.%s' % node.module
|
|
|
else:
|
|
|
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.
|
|
|
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 node.module and node.col_offset == root_col_offset:
|
|
|
if symbols and fullname not in allowsymbolimports:
|
|
|
yield msg('direct symbol import %s from %s',
|
|
|
', '.join(symbols), fullname)
|
|
|
|
|
|
if symbols and seennonsymbollocal:
|
|
|
yield msg('symbol import follows non-symbol import: %s',
|
|
|
fullname)
|
|
|
if not symbols and fullname not in stdlib_modules:
|
|
|
seennonsymbollocal = True
|
|
|
|
|
|
if not node.module:
|
|
|
assert node.level
|
|
|
|
|
|
# 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.
|
|
|
|
|
|
>>> 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.
|
|
|
|
|
|
>>> from __future__ import print_function
|
|
|
>>> 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.keys()):
|
|
|
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 embedded(f, modname, src):
|
|
|
"""Extract embedded python code
|
|
|
|
|
|
>>> def test(fn, lines):
|
|
|
... for s, m, f, l in embedded(fn, "example", lines):
|
|
|
... print("%s %s %s" % (m, f, l))
|
|
|
... print(repr(s))
|
|
|
>>> lines = [
|
|
|
... 'comment',
|
|
|
... ' >>> from __future__ import print_function',
|
|
|
... " >>> ' multiline",
|
|
|
... " ... string'",
|
|
|
... ' ',
|
|
|
... 'comment',
|
|
|
... ' $ cat > foo.py <<EOF',
|
|
|
... ' > from __future__ import print_function',
|
|
|
... ' > EOF',
|
|
|
... ]
|
|
|
>>> test("example.t", lines)
|
|
|
example[2] doctest.py 2
|
|
|
"from __future__ import print_function\\n' multiline\\nstring'\\n"
|
|
|
example[7] foo.py 7
|
|
|
'from __future__ import print_function\\n'
|
|
|
"""
|
|
|
inlinepython = 0
|
|
|
shpython = 0
|
|
|
script = []
|
|
|
prefix = 6
|
|
|
t = ''
|
|
|
n = 0
|
|
|
for l in src:
|
|
|
n += 1
|
|
|
if not l.endswith(b'\n'):
|
|
|
l += b'\n'
|
|
|
if l.startswith(b' >>> '): # python inlines
|
|
|
if shpython:
|
|
|
print("%s:%d: Parse Error" % (f, n))
|
|
|
if not inlinepython:
|
|
|
# We've just entered a Python block.
|
|
|
inlinepython = n
|
|
|
t = 'doctest.py'
|
|
|
script.append(l[prefix:])
|
|
|
continue
|
|
|
if l.startswith(b' ... '): # python inlines
|
|
|
script.append(l[prefix:])
|
|
|
continue
|
|
|
cat = re.search(r"\$ \s*cat\s*>\s*(\S+\.py)\s*<<\s*EOF", l)
|
|
|
if cat:
|
|
|
if inlinepython:
|
|
|
yield ''.join(script), ("%s[%d]" %
|
|
|
(modname, inlinepython)), t, inlinepython
|
|
|
script = []
|
|
|
inlinepython = 0
|
|
|
shpython = n
|
|
|
t = cat.group(1)
|
|
|
continue
|
|
|
if shpython and l.startswith(b' > '): # sh continuation
|
|
|
if l == b' > EOF\n':
|
|
|
yield ''.join(script), ("%s[%d]" %
|
|
|
(modname, shpython)), t, shpython
|
|
|
script = []
|
|
|
shpython = 0
|
|
|
else:
|
|
|
script.append(l[4:])
|
|
|
continue
|
|
|
if inlinepython and l == b' \n':
|
|
|
yield ''.join(script), ("%s[%d]" %
|
|
|
(modname, inlinepython)), t, inlinepython
|
|
|
script = []
|
|
|
inlinepython = 0
|
|
|
continue
|
|
|
|
|
|
def sources(f, modname):
|
|
|
"""Yields possibly multiple sources from a filepath
|
|
|
|
|
|
input: filepath, modulename
|
|
|
yields: script(string), modulename, filepath, linenumber
|
|
|
|
|
|
For embedded scripts, the modulename and filepath will be different
|
|
|
from the function arguments. linenumber is an offset relative to
|
|
|
the input file.
|
|
|
"""
|
|
|
py = False
|
|
|
if not f.endswith('.t'):
|
|
|
with open(f) as src:
|
|
|
yield src.read(), modname, f, 0
|
|
|
py = True
|
|
|
if py or f.endswith('.t'):
|
|
|
with open(f) as src:
|
|
|
for script, modname, t, line in embedded(f, modname, src):
|
|
|
yield script, modname, t, line
|
|
|
|
|
|
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 localmodname, source_path in sorted(localmods.items()):
|
|
|
for src, modname, name, line in sources(source_path, localmodname):
|
|
|
try:
|
|
|
used_imports[modname] = sorted(
|
|
|
imported_modules(src, modname, name, localmods,
|
|
|
ignore_nested=True))
|
|
|
for error, lineno in verify_import_convention(modname, src,
|
|
|
localmods):
|
|
|
any_errors = True
|
|
|
print('%s:%d: %s' % (source_path, lineno + line, error))
|
|
|
except SyntaxError as e:
|
|
|
print('%s:%d: SyntaxError: %s' %
|
|
|
(source_path, e.lineno + line, e))
|
|
|
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)))
|
|
|
|
