contrib/import-checker.py
author Pierre-Yves David <pierre-yves.david@octobus.net>
Sat, 10 Jun 2017 01:59:22 +0100
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child 33876 998fad4b3072
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#!/usr/bin/env python
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from __future__ import absolute_import, print_function
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import ast
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import collections
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import os
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import re
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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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if True: # disable lexical sorting checks
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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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    # for cffi modules to re-export pure functions
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    'mercurial.pure.base85',
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    'mercurial.pure.bdiff',
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    'mercurial.pure.diffhelpers',
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    'mercurial.pure.mpatch',
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    'mercurial.pure.osutil',
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    'mercurial.pure.parsers',
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)
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# Whitelist of symbols that can be directly imported.
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directsymbols = (
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    'demandimport',
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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):
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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('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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    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 set of absolute `dotted_name_of_path()`-ed source file
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    paths of locally defined (= 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__', 'foo.foo1',
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    ...              'foo.bar.__init__', 'foo.bar.bar1',
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    ...              'baz.__init__', 'baz.baz1'}
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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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    >>> fromlocal('foo1', 1)
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    ('foo.foo1', 'foo.foo1', False)
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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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    >>> fromlocal2('bar2', 1)
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    False
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    >>> fromlocal2('bar', 2)
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    ('foo.bar', 'foo.bar.__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 false value when relative imports are used.
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        if not name:
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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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            if not level:
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                # Check relative name first.
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                candidates = [prefix + name, name]
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            else:
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                candidates = ['.'.join(modulename.split('.')[:-level]) +
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                              '.' + 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 populateextmods(localmods):
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    """Populate C extension modules based on pure modules"""
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    newlocalmods = set(localmods)
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    for n in localmods:
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        if n.startswith('mercurial.pure.'):
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            m = n[len('mercurial.pure.'):]
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            newlocalmods.add('mercurial.cext.' + m)
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            newlocalmods.add('mercurial.cffi._' + m)
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    return newlocalmods
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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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    >>> 'cffi' 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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    for m in 'cPickle', 'datetime': # in Python (not C) on PyPy
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        yield m
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    for m in ['cffi']:
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        yield m
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    stdlib_prefixes = {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.
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        if not any(libpath.startswith(p) for p in stdlib_prefixes):
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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 ('hgdemandimport', 'hgext',
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                                                '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, f, 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: set 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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    >>> f = 'foo/xxx.py'
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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, f, 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, f, localmods))
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    ['foo.bar.bar1', 'foo.foo1']
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   293
    >>> sorted(imported_modules(
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   294
    ...        'from bar.bar1 import name1, name2, name3',
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    ...        modulename, f, localmods))
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   296
    ['foo.bar.bar1']
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   297
    >>> # absolute importing
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   298
    >>> sorted(imported_modules(
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   299
    ...        'from baz import baz1, name1',
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   300
    ...        modulename, f, localmods))
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   301
    ['baz.__init__', 'baz.baz1']
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   302
    >>> # mixed importing, even though it shouldn't be recommended
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   303
    >>> sorted(imported_modules(
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   304
    ...        'import stdlib, foo1, baz',
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   305
    ...        modulename, f, localmods))
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   306
    ['baz.__init__', 'foo.foo1']
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   307
    >>> # ignore_nested
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   308
    >>> sorted(imported_modules(
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   309
    ... '''import foo
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    ... def wat():
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   311
    ...     import bar
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    ... ''', modulename, f, localmods))
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   313
    ['foo.__init__', 'foo.bar.__init__']
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   314
    >>> sorted(imported_modules(
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   315
    ... '''import foo
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   316
    ... def wat():
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   317
    ...     import bar
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   318
    ... ''', modulename, f, localmods, ignore_nested=True))
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   319
    ['foo.__init__']
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   320
    """
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   321
    fromlocal = fromlocalfunc(modulename, localmods)
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   322
    for node in ast.walk(ast.parse(source, f)):
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diff changeset
   323
        if ignore_nested and getattr(node, 'col_offset', 0) > 0:
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   324
            continue
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        if isinstance(node, ast.Import):
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   326
            for n in node.names:
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   327
                found = fromlocal(n.name)
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   328
                if not found:
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   329
                    # this should import standard library
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   330
                    continue
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   331
                yield found[1]
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   332
        elif isinstance(node, ast.ImportFrom):
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   333
            found = fromlocal(node.module, node.level)
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   334
            if not found:
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   335
                # this should import standard library
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   336
                continue
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   337
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   338
            absname, dottedpath, hassubmod = found
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   339
            if not hassubmod:
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   340
                # "dottedpath" is not a package; must be imported
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   341
                yield dottedpath
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   342
                # examination of "node.names" should be redundant
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   343
                # e.g.: from mercurial.node import nullid, nullrev
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   344
                continue
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   345
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   346
            modnotfound = False
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   347
            prefix = absname + '.'
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            for n in node.names:
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                found = fromlocal(prefix + n.name)
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   350
                if not found:
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   351
                    # this should be a function or a property of "node.module"
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                    modnotfound = True
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   353
                    continue
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   354
                yield found[1]
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   355
            if modnotfound:
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Yuya Nishihara <yuya@tcha.org>
parents: 26956
diff changeset
   356
                # "dottedpath" is a package, but imported because of non-module
5abba2c92da3 import-checker: allow import of child modules from package root
Yuya Nishihara <yuya@tcha.org>
parents: 26956
diff changeset
   357
                # lookup
5abba2c92da3 import-checker: allow import of child modules from package root
Yuya Nishihara <yuya@tcha.org>
parents: 26956
diff changeset
   358
                yield dottedpath
20036
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   359
27272
69308357ecd1 import-checker: allow absolute imports of sub modules from local packages
Yuya Nishihara <yuya@tcha.org>
parents: 27018
diff changeset
   360
def verify_import_convention(module, source, localmods):
25703
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   361
    """Verify imports match our established coding convention.
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   362
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   363
    We have 2 conventions: legacy and modern. The modern convention is in
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   364
    effect when using absolute imports.
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   365
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   366
    The legacy convention only looks for mixed imports. The modern convention
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   367
    is much more thorough.
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   368
    """
25702
ab2c5163900e import-checker: establish new function for verifying import conventions
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25701
diff changeset
   369
    root = ast.parse(source)
25703
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   370
    absolute = usingabsolute(root)
25702
ab2c5163900e import-checker: establish new function for verifying import conventions
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25701
diff changeset
   371
25703
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   372
    if absolute:
27272
69308357ecd1 import-checker: allow absolute imports of sub modules from local packages
Yuya Nishihara <yuya@tcha.org>
parents: 27018
diff changeset
   373
        return verify_modern_convention(module, root, localmods)
25703
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   374
    else:
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   375
        return verify_stdlib_on_own_line(root)
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   376
27272
69308357ecd1 import-checker: allow absolute imports of sub modules from local packages
Yuya Nishihara <yuya@tcha.org>
parents: 27018
diff changeset
   377
def verify_modern_convention(module, root, localmods, root_col_offset=0):
25703
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   378
    """Verify a file conforms to the modern import convention rules.
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   379
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   380
    The rules of the modern convention are:
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   381
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   382
    * Ordering is stdlib followed by local imports. Each group is lexically
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   383
      sorted.
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   384
    * Importing multiple modules via "import X, Y" is not allowed: use
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   385
      separate import statements.
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   386
    * Importing multiple modules via "from X import ..." is allowed if using
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   387
      parenthesis and one entry per line.
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   388
    * Only 1 relative import statement per import level ("from .", "from ..")
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   389
      is allowed.
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   390
    * Relative imports from higher levels must occur before lower levels. e.g.
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   391
      "from .." must be before "from .".
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   392
    * Imports from peer packages should use relative import (e.g. do not
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   393
      "import mercurial.foo" from a "mercurial.*" module).
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   394
    * Symbols can only be imported from specific modules (see
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   395
      `allowsymbolimports`). For other modules, first import the module then
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   396
      assign the symbol to a module-level variable. In addition, these imports
29208
cba8bc11ed10 import-checker: extend check of symbol-import order to all local modules
Yuya Nishihara <yuya@tcha.org>
parents: 29207
diff changeset
   397
      must be performed before other local imports. This rule only
25703
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   398
      applies to import statements outside of any blocks.
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   399
    * Relative imports from the standard library are not allowed.
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   400
    * Certain modules must be aliased to alternate names to avoid aliasing
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   401
      and readability problems. See `requirealias`.
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   402
    """
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   403
    topmodule = module.split('.')[0]
27272
69308357ecd1 import-checker: allow absolute imports of sub modules from local packages
Yuya Nishihara <yuya@tcha.org>
parents: 27018
diff changeset
   404
    fromlocal = fromlocalfunc(module, localmods)
25703
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   405
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   406
    # Whether a local/non-stdlib import has been performed.
28330
f3fb24e36d61 import-checker: report local with stdlib late warning
timeless <timeless@mozdev.org>
parents: 27621
diff changeset
   407
    seenlocal = None
29208
cba8bc11ed10 import-checker: extend check of symbol-import order to all local modules
Yuya Nishihara <yuya@tcha.org>
parents: 29207
diff changeset
   408
    # Whether a local/non-stdlib, non-symbol import has been seen.
cba8bc11ed10 import-checker: extend check of symbol-import order to all local modules
Yuya Nishihara <yuya@tcha.org>
parents: 29207
diff changeset
   409
    seennonsymbollocal = False
25703
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   410
    # The last name to be imported (for sorting).
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   411
    lastname = None
30590
74eecb93c617 import-checker: do not enforce lexical sort accross stdlib/local boundary
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents: 29395
diff changeset
   412
    laststdlib = None
25703
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   413
    # Relative import levels encountered so far.
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   414
    seenlevels = set()
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   415
26965
1fa66d3ad28d import-checker: reset context to verify convention in function scope
Yuya Nishihara <yuya@tcha.org>
parents: 26964
diff changeset
   416
    for node, newscope in walklocal(root):
26955
c4114e335b49 import-checker: extract function to generate a formatted warning
Yuya Nishihara <yuya@tcha.org>
parents: 26954
diff changeset
   417
        def msg(fmt, *args):
26956
4b56214ebb7a import-checker: include lineno in warning message
Yuya Nishihara <yuya@tcha.org>
parents: 26955
diff changeset
   418
            return (fmt % args, node.lineno)
26965
1fa66d3ad28d import-checker: reset context to verify convention in function scope
Yuya Nishihara <yuya@tcha.org>
parents: 26964
diff changeset
   419
        if newscope:
1fa66d3ad28d import-checker: reset context to verify convention in function scope
Yuya Nishihara <yuya@tcha.org>
parents: 26964
diff changeset
   420
            # Check for local imports in function
27272
69308357ecd1 import-checker: allow absolute imports of sub modules from local packages
Yuya Nishihara <yuya@tcha.org>
parents: 27018
diff changeset
   421
            for r in verify_modern_convention(module, node, localmods,
26965
1fa66d3ad28d import-checker: reset context to verify convention in function scope
Yuya Nishihara <yuya@tcha.org>
parents: 26964
diff changeset
   422
                                              node.col_offset + 4):
1fa66d3ad28d import-checker: reset context to verify convention in function scope
Yuya Nishihara <yuya@tcha.org>
parents: 26964
diff changeset
   423
                yield r
1fa66d3ad28d import-checker: reset context to verify convention in function scope
Yuya Nishihara <yuya@tcha.org>
parents: 26964
diff changeset
   424
        elif isinstance(node, ast.Import):
25703
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   425
            # Disallow "import foo, bar" and require separate imports
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   426
            # for each module.
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   427
            if len(node.names) > 1:
26955
c4114e335b49 import-checker: extract function to generate a formatted warning
Yuya Nishihara <yuya@tcha.org>
parents: 26954
diff changeset
   428
                yield msg('multiple imported names: %s',
c4114e335b49 import-checker: extract function to generate a formatted warning
Yuya Nishihara <yuya@tcha.org>
parents: 26954
diff changeset
   429
                          ', '.join(n.name for n in node.names))
25703
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   430
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   431
            name = node.names[0].name
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   432
            asname = node.names[0].asname
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   433
30590
74eecb93c617 import-checker: do not enforce lexical sort accross stdlib/local boundary
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents: 29395
diff changeset
   434
            stdlib = name in stdlib_modules
74eecb93c617 import-checker: do not enforce lexical sort accross stdlib/local boundary
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents: 29395
diff changeset
   435
25703
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   436
            # Ignore sorting rules on imports inside blocks.
26965
1fa66d3ad28d import-checker: reset context to verify convention in function scope
Yuya Nishihara <yuya@tcha.org>
parents: 26964
diff changeset
   437
            if node.col_offset == root_col_offset:
30590
74eecb93c617 import-checker: do not enforce lexical sort accross stdlib/local boundary
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents: 29395
diff changeset
   438
                if lastname and name < lastname and laststdlib == stdlib:
26955
c4114e335b49 import-checker: extract function to generate a formatted warning
Yuya Nishihara <yuya@tcha.org>
parents: 26954
diff changeset
   439
                    yield msg('imports not lexically sorted: %s < %s',
c4114e335b49 import-checker: extract function to generate a formatted warning
Yuya Nishihara <yuya@tcha.org>
parents: 26954
diff changeset
   440
                              name, lastname)
25703
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   441
30590
74eecb93c617 import-checker: do not enforce lexical sort accross stdlib/local boundary
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents: 29395
diff changeset
   442
            lastname = name
74eecb93c617 import-checker: do not enforce lexical sort accross stdlib/local boundary
Pierre-Yves David <pierre-yves.david@ens-lyon.org>
parents: 29395
diff changeset
   443
            laststdlib = stdlib
25703
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   444
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   445
            # stdlib imports should be before local imports.
26965
1fa66d3ad28d import-checker: reset context to verify convention in function scope
Yuya Nishihara <yuya@tcha.org>
parents: 26964
diff changeset
   446
            if stdlib and seenlocal and node.col_offset == root_col_offset:
28330
f3fb24e36d61 import-checker: report local with stdlib late warning
timeless <timeless@mozdev.org>
parents: 27621
diff changeset
   447
                yield msg('stdlib import "%s" follows local import: %s',
f3fb24e36d61 import-checker: report local with stdlib late warning
timeless <timeless@mozdev.org>
parents: 27621
diff changeset
   448
                          name, seenlocal)
25703
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   449
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   450
            if not stdlib:
28330
f3fb24e36d61 import-checker: report local with stdlib late warning
timeless <timeless@mozdev.org>
parents: 27621
diff changeset
   451
                seenlocal = name
25703
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   452
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   453
            # Import of sibling modules should use relative imports.
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   454
            topname = name.split('.')[0]
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   455
            if topname == topmodule:
26955
c4114e335b49 import-checker: extract function to generate a formatted warning
Yuya Nishihara <yuya@tcha.org>
parents: 26954
diff changeset
   456
                yield msg('import should be relative: %s', name)
25703
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   457
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   458
            if name in requirealias and asname != requirealias[name]:
26955
c4114e335b49 import-checker: extract function to generate a formatted warning
Yuya Nishihara <yuya@tcha.org>
parents: 26954
diff changeset
   459
                yield msg('%s module must be "as" aliased to %s',
c4114e335b49 import-checker: extract function to generate a formatted warning
Yuya Nishihara <yuya@tcha.org>
parents: 26954
diff changeset
   460
                          name, requirealias[name])
25703
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   461
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   462
        elif isinstance(node, ast.ImportFrom):
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   463
            # Resolve the full imported module name.
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   464
            if node.level > 0:
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   465
                fullname = '.'.join(module.split('.')[:-node.level])
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   466
                if node.module:
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   467
                    fullname += '.%s' % node.module
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   468
            else:
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   469
                assert node.module
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   470
                fullname = node.module
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   471
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   472
                topname = fullname.split('.')[0]
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   473
                if topname == topmodule:
26955
c4114e335b49 import-checker: extract function to generate a formatted warning
Yuya Nishihara <yuya@tcha.org>
parents: 26954
diff changeset
   474
                    yield msg('import should be relative: %s', fullname)
25703
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   475
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   476
            # __future__ is special since it needs to come first and use
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   477
            # symbol import.
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   478
            if fullname != '__future__':
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   479
                if not fullname or fullname in stdlib_modules:
26955
c4114e335b49 import-checker: extract function to generate a formatted warning
Yuya Nishihara <yuya@tcha.org>
parents: 26954
diff changeset
   480
                    yield msg('relative import of stdlib module')
25703
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   481
                else:
28330
f3fb24e36d61 import-checker: report local with stdlib late warning
timeless <timeless@mozdev.org>
parents: 27621
diff changeset
   482
                    seenlocal = fullname
25703
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   483
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   484
            # Direct symbol import is only allowed from certain modules and
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   485
            # must occur before non-symbol imports.
29207
a09098c61fea import-checker: always build a list of imported symbols
Yuya Nishihara <yuya@tcha.org>
parents: 29122
diff changeset
   486
            found = fromlocal(node.module, node.level)
a09098c61fea import-checker: always build a list of imported symbols
Yuya Nishihara <yuya@tcha.org>
parents: 29122
diff changeset
   487
            if found and found[2]:  # node.module is a package
a09098c61fea import-checker: always build a list of imported symbols
Yuya Nishihara <yuya@tcha.org>
parents: 29122
diff changeset
   488
                prefix = found[0] + '.'
32419
d02888308235 import-checker: add a way to directly import certain symbols
Siddharth Agarwal <sid0@fb.com>
parents: 32374
diff changeset
   489
                symbols = (n.name for n in node.names
d02888308235 import-checker: add a way to directly import certain symbols
Siddharth Agarwal <sid0@fb.com>
parents: 32374
diff changeset
   490
                           if not fromlocal(prefix + n.name))
29207
a09098c61fea import-checker: always build a list of imported symbols
Yuya Nishihara <yuya@tcha.org>
parents: 29122
diff changeset
   491
            else:
32419
d02888308235 import-checker: add a way to directly import certain symbols
Siddharth Agarwal <sid0@fb.com>
parents: 32374
diff changeset
   492
                symbols = (n.name for n in node.names)
d02888308235 import-checker: add a way to directly import certain symbols
Siddharth Agarwal <sid0@fb.com>
parents: 32374
diff changeset
   493
            symbols = [sym for sym in symbols if sym not in directsymbols]
26965
1fa66d3ad28d import-checker: reset context to verify convention in function scope
Yuya Nishihara <yuya@tcha.org>
parents: 26964
diff changeset
   494
            if node.module and node.col_offset == root_col_offset:
27272
69308357ecd1 import-checker: allow absolute imports of sub modules from local packages
Yuya Nishihara <yuya@tcha.org>
parents: 27018
diff changeset
   495
                if symbols and fullname not in allowsymbolimports:
27273
5d5b98346fc2 import-checker: tell which symbol causes "direct symbol import"
Yuya Nishihara <yuya@tcha.org>
parents: 27272
diff changeset
   496
                    yield msg('direct symbol import %s from %s',
5d5b98346fc2 import-checker: tell which symbol causes "direct symbol import"
Yuya Nishihara <yuya@tcha.org>
parents: 27272
diff changeset
   497
                              ', '.join(symbols), fullname)
25703
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   498
29208
cba8bc11ed10 import-checker: extend check of symbol-import order to all local modules
Yuya Nishihara <yuya@tcha.org>
parents: 29207
diff changeset
   499
                if symbols and seennonsymbollocal:
26955
c4114e335b49 import-checker: extract function to generate a formatted warning
Yuya Nishihara <yuya@tcha.org>
parents: 26954
diff changeset
   500
                    yield msg('symbol import follows non-symbol import: %s',
c4114e335b49 import-checker: extract function to generate a formatted warning
Yuya Nishihara <yuya@tcha.org>
parents: 26954
diff changeset
   501
                              fullname)
29208
cba8bc11ed10 import-checker: extend check of symbol-import order to all local modules
Yuya Nishihara <yuya@tcha.org>
parents: 29207
diff changeset
   502
            if not symbols and fullname not in stdlib_modules:
cba8bc11ed10 import-checker: extend check of symbol-import order to all local modules
Yuya Nishihara <yuya@tcha.org>
parents: 29207
diff changeset
   503
                seennonsymbollocal = True
25703
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   504
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   505
            if not node.module:
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   506
                assert node.level
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   507
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   508
                # Only allow 1 group per level.
26965
1fa66d3ad28d import-checker: reset context to verify convention in function scope
Yuya Nishihara <yuya@tcha.org>
parents: 26964
diff changeset
   509
                if (node.level in seenlevels
1fa66d3ad28d import-checker: reset context to verify convention in function scope
Yuya Nishihara <yuya@tcha.org>
parents: 26964
diff changeset
   510
                    and node.col_offset == root_col_offset):
26955
c4114e335b49 import-checker: extract function to generate a formatted warning
Yuya Nishihara <yuya@tcha.org>
parents: 26954
diff changeset
   511
                    yield msg('multiple "from %s import" statements',
c4114e335b49 import-checker: extract function to generate a formatted warning
Yuya Nishihara <yuya@tcha.org>
parents: 26954
diff changeset
   512
                              '.' * node.level)
25703
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   513
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   514
                # Higher-level groups come before lower-level groups.
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   515
                if any(node.level > l for l in seenlevels):
26955
c4114e335b49 import-checker: extract function to generate a formatted warning
Yuya Nishihara <yuya@tcha.org>
parents: 26954
diff changeset
   516
                    yield msg('higher-level import should come first: %s',
c4114e335b49 import-checker: extract function to generate a formatted warning
Yuya Nishihara <yuya@tcha.org>
parents: 26954
diff changeset
   517
                              fullname)
25703
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   518
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   519
                seenlevels.add(node.level)
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   520
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   521
            # Entries in "from .X import ( ... )" lists must be lexically
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   522
            # sorted.
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   523
            lastentryname = None
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   524
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   525
            for n in node.names:
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   526
                if lastentryname and n.name < lastentryname:
26955
c4114e335b49 import-checker: extract function to generate a formatted warning
Yuya Nishihara <yuya@tcha.org>
parents: 26954
diff changeset
   527
                    yield msg('imports from %s not lexically sorted: %s < %s',
c4114e335b49 import-checker: extract function to generate a formatted warning
Yuya Nishihara <yuya@tcha.org>
parents: 26954
diff changeset
   528
                              fullname, n.name, lastentryname)
25703
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   529
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   530
                lastentryname = n.name
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   531
1a6a117d0b95 import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25702
diff changeset
   532
                if n.name in requirealias and n.asname != requirealias[n.name]:
26955
c4114e335b49 import-checker: extract function to generate a formatted warning
Yuya Nishihara <yuya@tcha.org>
parents: 26954
diff changeset
   533
                    yield msg('%s from %s must be "as" aliased to %s',
c4114e335b49 import-checker: extract function to generate a formatted warning
Yuya Nishihara <yuya@tcha.org>
parents: 26954
diff changeset
   534
                              n.name, fullname, requirealias[n.name])
25702
ab2c5163900e import-checker: establish new function for verifying import conventions
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25701
diff changeset
   535
ab2c5163900e import-checker: establish new function for verifying import conventions
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25701
diff changeset
   536
def verify_stdlib_on_own_line(root):
20036
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   537
    """Given some python source, verify that stdlib imports are done
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   538
    in separate statements from relative local module imports.
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   539
25702
ab2c5163900e import-checker: establish new function for verifying import conventions
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25701
diff changeset
   540
    >>> list(verify_stdlib_on_own_line(ast.parse('import sys, foo')))
26956
4b56214ebb7a import-checker: include lineno in warning message
Yuya Nishihara <yuya@tcha.org>
parents: 26955
diff changeset
   541
    [('mixed imports\\n   stdlib:    sys\\n   relative:  foo', 1)]
25702
ab2c5163900e import-checker: establish new function for verifying import conventions
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25701
diff changeset
   542
    >>> list(verify_stdlib_on_own_line(ast.parse('import sys, os')))
20036
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   543
    []
25702
ab2c5163900e import-checker: establish new function for verifying import conventions
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25701
diff changeset
   544
    >>> list(verify_stdlib_on_own_line(ast.parse('import foo, bar')))
20036
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   545
    []
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   546
    """
25702
ab2c5163900e import-checker: establish new function for verifying import conventions
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25701
diff changeset
   547
    for node in ast.walk(root):
20036
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   548
        if isinstance(node, ast.Import):
20386
a05d31b040d7 import-checker: show stdlib and relative imports separately
Mads Kiilerich <madski@unity3d.com>
parents: 20383
diff changeset
   549
            from_stdlib = {False: [], True: []}
20036
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   550
            for n in node.names:
20386
a05d31b040d7 import-checker: show stdlib and relative imports separately
Mads Kiilerich <madski@unity3d.com>
parents: 20383
diff changeset
   551
                from_stdlib[n.name in stdlib_modules].append(n.name)
a05d31b040d7 import-checker: show stdlib and relative imports separately
Mads Kiilerich <madski@unity3d.com>
parents: 20383
diff changeset
   552
            if from_stdlib[True] and from_stdlib[False]:
a05d31b040d7 import-checker: show stdlib and relative imports separately
Mads Kiilerich <madski@unity3d.com>
parents: 20383
diff changeset
   553
                yield ('mixed imports\n   stdlib:    %s\n   relative:  %s' %
a05d31b040d7 import-checker: show stdlib and relative imports separately
Mads Kiilerich <madski@unity3d.com>
parents: 20383
diff changeset
   554
                       (', '.join(sorted(from_stdlib[True])),
26956
4b56214ebb7a import-checker: include lineno in warning message
Yuya Nishihara <yuya@tcha.org>
parents: 26955
diff changeset
   555
                        ', '.join(sorted(from_stdlib[False]))), node.lineno)
20036
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   556
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   557
class CircularImport(Exception):
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   558
    pass
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   559
24490
fb4639d5268e import-checker: make search algorithm non-recursive breadth-first
Matt Mackall <mpm@selenic.com>
parents: 24489
diff changeset
   560
def checkmod(mod, imports):
fb4639d5268e import-checker: make search algorithm non-recursive breadth-first
Matt Mackall <mpm@selenic.com>
parents: 24489
diff changeset
   561
    shortest = {}
fb4639d5268e import-checker: make search algorithm non-recursive breadth-first
Matt Mackall <mpm@selenic.com>
parents: 24489
diff changeset
   562
    visit = [[mod]]
fb4639d5268e import-checker: make search algorithm non-recursive breadth-first
Matt Mackall <mpm@selenic.com>
parents: 24489
diff changeset
   563
    while visit:
fb4639d5268e import-checker: make search algorithm non-recursive breadth-first
Matt Mackall <mpm@selenic.com>
parents: 24489
diff changeset
   564
        path = visit.pop(0)
fb4639d5268e import-checker: make search algorithm non-recursive breadth-first
Matt Mackall <mpm@selenic.com>
parents: 24489
diff changeset
   565
        for i in sorted(imports.get(path[-1], [])):
fb4639d5268e import-checker: make search algorithm non-recursive breadth-first
Matt Mackall <mpm@selenic.com>
parents: 24489
diff changeset
   566
            if len(path) < shortest.get(i, 1000):
fb4639d5268e import-checker: make search algorithm non-recursive breadth-first
Matt Mackall <mpm@selenic.com>
parents: 24489
diff changeset
   567
                shortest[i] = len(path)
fb4639d5268e import-checker: make search algorithm non-recursive breadth-first
Matt Mackall <mpm@selenic.com>
parents: 24489
diff changeset
   568
                if i in path:
fb4639d5268e import-checker: make search algorithm non-recursive breadth-first
Matt Mackall <mpm@selenic.com>
parents: 24489
diff changeset
   569
                    if i == path[0]:
fb4639d5268e import-checker: make search algorithm non-recursive breadth-first
Matt Mackall <mpm@selenic.com>
parents: 24489
diff changeset
   570
                        raise CircularImport(path)
fb4639d5268e import-checker: make search algorithm non-recursive breadth-first
Matt Mackall <mpm@selenic.com>
parents: 24489
diff changeset
   571
                    continue
fb4639d5268e import-checker: make search algorithm non-recursive breadth-first
Matt Mackall <mpm@selenic.com>
parents: 24489
diff changeset
   572
                visit.append(path + [i])
20036
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   573
20038
c65a6937b828 import-checker: try a little harder to show fewer cycles
Augie Fackler <raf@durin42.com>
parents: 20037
diff changeset
   574
def rotatecycle(cycle):
c65a6937b828 import-checker: try a little harder to show fewer cycles
Augie Fackler <raf@durin42.com>
parents: 20037
diff changeset
   575
    """arrange a cycle so that the lexicographically first module listed first
c65a6937b828 import-checker: try a little harder to show fewer cycles
Augie Fackler <raf@durin42.com>
parents: 20037
diff changeset
   576
24488
4b3fc46097f7 import-checker: drop duplicate element from cycle
Matt Mackall <mpm@selenic.com>
parents: 24487
diff changeset
   577
    >>> rotatecycle(['foo', 'bar'])
20038
c65a6937b828 import-checker: try a little harder to show fewer cycles
Augie Fackler <raf@durin42.com>
parents: 20037
diff changeset
   578
    ['bar', 'foo', 'bar']
c65a6937b828 import-checker: try a little harder to show fewer cycles
Augie Fackler <raf@durin42.com>
parents: 20037
diff changeset
   579
    """
c65a6937b828 import-checker: try a little harder to show fewer cycles
Augie Fackler <raf@durin42.com>
parents: 20037
diff changeset
   580
    lowest = min(cycle)
c65a6937b828 import-checker: try a little harder to show fewer cycles
Augie Fackler <raf@durin42.com>
parents: 20037
diff changeset
   581
    idx = cycle.index(lowest)
24488
4b3fc46097f7 import-checker: drop duplicate element from cycle
Matt Mackall <mpm@selenic.com>
parents: 24487
diff changeset
   582
    return cycle[idx:] + cycle[:idx] + [lowest]
20036
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   583
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   584
def find_cycles(imports):
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   585
    """Find cycles in an already-loaded import graph.
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   586
25175
10e6c4b7121b import-checker: don't treat modules as relative one if not found
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 25174
diff changeset
   587
    All module names recorded in `imports` should be absolute one.
10e6c4b7121b import-checker: don't treat modules as relative one if not found
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 25174
diff changeset
   588
28703
a274c4f9087a py3: use print_function in import-checker
timeless <timeless@mozdev.org>
parents: 28702
diff changeset
   589
    >>> from __future__ import print_function
25175
10e6c4b7121b import-checker: don't treat modules as relative one if not found
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 25174
diff changeset
   590
    >>> imports = {'top.foo': ['top.bar', 'os.path', 'top.qux'],
10e6c4b7121b import-checker: don't treat modules as relative one if not found
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 25174
diff changeset
   591
    ...            'top.bar': ['top.baz', 'sys'],
10e6c4b7121b import-checker: don't treat modules as relative one if not found
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 25174
diff changeset
   592
    ...            'top.baz': ['top.foo'],
10e6c4b7121b import-checker: don't treat modules as relative one if not found
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 25174
diff changeset
   593
    ...            'top.qux': ['top.foo']}
28703
a274c4f9087a py3: use print_function in import-checker
timeless <timeless@mozdev.org>
parents: 28702
diff changeset
   594
    >>> print('\\n'.join(sorted(find_cycles(imports))))
24487
642d245ff537 import-checker: fix rotatecycle
Matt Mackall <mpm@selenic.com>
parents: 22975
diff changeset
   595
    top.bar -> top.baz -> top.foo -> top.bar
642d245ff537 import-checker: fix rotatecycle
Matt Mackall <mpm@selenic.com>
parents: 22975
diff changeset
   596
    top.foo -> top.qux -> top.foo
20036
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   597
    """
24491
784b278b349c import-checker: rotatecycle is actually the canonical cycle key
Matt Mackall <mpm@selenic.com>
parents: 24490
diff changeset
   598
    cycles = set()
28704
1fa6fdb72275 py3: handle iter/iterkeys+iteritems python3 divergence in import-checker
timeless <timeless@mozdev.org>
parents: 28703
diff changeset
   599
    for mod in sorted(imports.keys()):
20036
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   600
        try:
24490
fb4639d5268e import-checker: make search algorithm non-recursive breadth-first
Matt Mackall <mpm@selenic.com>
parents: 24489
diff changeset
   601
            checkmod(mod, imports)
25660
328739ea70c3 global: mass rewrite to use modern exception syntax
Gregory Szorc <gregory.szorc@gmail.com>
parents: 25175
diff changeset
   602
        except CircularImport as e:
20036
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   603
            cycle = e.args[0]
24491
784b278b349c import-checker: rotatecycle is actually the canonical cycle key
Matt Mackall <mpm@selenic.com>
parents: 24490
diff changeset
   604
            cycles.add(" -> ".join(rotatecycle(cycle)))
784b278b349c import-checker: rotatecycle is actually the canonical cycle key
Matt Mackall <mpm@selenic.com>
parents: 24490
diff changeset
   605
    return cycles
20036
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   606
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   607
def _cycle_sortkey(c):
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   608
    return len(c), c
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   609
28922
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   610
def embedded(f, modname, src):
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   611
    """Extract embedded python code
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   612
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   613
    >>> def test(fn, lines):
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   614
    ...     for s, m, f, l in embedded(fn, "example", lines):
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   615
    ...         print("%s %s %s" % (m, f, l))
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   616
    ...         print(repr(s))
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   617
    >>> lines = [
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   618
    ...   'comment',
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   619
    ...   '  >>> from __future__ import print_function',
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   620
    ...   "  >>> ' multiline",
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   621
    ...   "  ... string'",
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   622
    ...   '  ',
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   623
    ...   'comment',
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   624
    ...   '  $ cat > foo.py <<EOF',
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   625
    ...   '  > from __future__ import print_function',
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   626
    ...   '  > EOF',
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   627
    ... ]
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   628
    >>> test("example.t", lines)
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   629
    example[2] doctest.py 2
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   630
    "from __future__ import print_function\\n' multiline\\nstring'\\n"
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   631
    example[7] foo.py 7
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   632
    'from __future__ import print_function\\n'
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   633
    """
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   634
    inlinepython = 0
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   635
    shpython = 0
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   636
    script = []
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   637
    prefix = 6
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   638
    t = ''
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   639
    n = 0
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   640
    for l in src:
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   641
        n += 1
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   642
        if not l.endswith(b'\n'):
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   643
            l += b'\n'
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   644
        if l.startswith(b'  >>> '): # python inlines
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   645
            if shpython:
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   646
                print("%s:%d: Parse Error" % (f, n))
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   647
            if not inlinepython:
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   648
                # We've just entered a Python block.
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   649
                inlinepython = n
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   650
                t = 'doctest.py'
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   651
            script.append(l[prefix:])
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   652
            continue
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   653
        if l.startswith(b'  ... '): # python inlines
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   654
            script.append(l[prefix:])
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   655
            continue
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   656
        cat = re.search(r"\$ \s*cat\s*>\s*(\S+\.py)\s*<<\s*EOF", l)
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   657
        if cat:
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   658
            if inlinepython:
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   659
                yield ''.join(script), ("%s[%d]" %
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   660
                       (modname, inlinepython)), t, inlinepython
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   661
                script = []
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   662
                inlinepython = 0
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   663
            shpython = n
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   664
            t = cat.group(1)
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   665
            continue
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   666
        if shpython and l.startswith(b'  > '): # sh continuation
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   667
            if l == b'  > EOF\n':
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   668
                yield ''.join(script), ("%s[%d]" %
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   669
                       (modname, shpython)), t, shpython
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   670
                script = []
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   671
                shpython = 0
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   672
            else:
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   673
                script.append(l[4:])
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   674
            continue
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   675
        if inlinepython and l == b'  \n':
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   676
            yield ''.join(script), ("%s[%d]" %
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   677
                   (modname, inlinepython)), t, inlinepython
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   678
            script = []
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   679
            inlinepython = 0
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   680
            continue
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   681
28919
a94f34306bb9 import-checker: refactor source reading
timeless <timeless@mozdev.org>
parents: 28713
diff changeset
   682
def sources(f, modname):
28922
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   683
    """Yields possibly multiple sources from a filepath
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   684
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   685
    input: filepath, modulename
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   686
    yields:  script(string), modulename, filepath, linenumber
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   687
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   688
    For embedded scripts, the modulename and filepath will be different
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   689
    from the function arguments. linenumber is an offset relative to
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   690
    the input file.
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   691
    """
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   692
    py = False
29234
393aef802535 tests: enable import checker for all python files (including no .py files)
Yuya Nishihara <yuya@tcha.org>
parents: 29211
diff changeset
   693
    if not f.endswith('.t'):
28919
a94f34306bb9 import-checker: refactor source reading
timeless <timeless@mozdev.org>
parents: 28713
diff changeset
   694
        with open(f) as src:
28922
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   695
            yield src.read(), modname, f, 0
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   696
            py = True
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   697
    if py or f.endswith('.t'):
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   698
        with open(f) as src:
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   699
            for script, modname, t, line in embedded(f, modname, src):
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   700
                yield script, modname, t, line
28919
a94f34306bb9 import-checker: refactor source reading
timeless <timeless@mozdev.org>
parents: 28713
diff changeset
   701
20036
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   702
def main(argv):
25063
723e364488f4 import-checker: add xargs like mode
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 24669
diff changeset
   703
    if len(argv) < 2 or (argv[1] == '-' and len(argv) > 2):
28703
a274c4f9087a py3: use print_function in import-checker
timeless <timeless@mozdev.org>
parents: 28702
diff changeset
   704
        print('Usage: %s {-|file [file] [file] ...}')
20036
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   705
        return 1
25063
723e364488f4 import-checker: add xargs like mode
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 24669
diff changeset
   706
    if argv[1] == '-':
723e364488f4 import-checker: add xargs like mode
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 24669
diff changeset
   707
        argv = argv[:1]
723e364488f4 import-checker: add xargs like mode
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 24669
diff changeset
   708
        argv.extend(l.rstrip() for l in sys.stdin.readlines())
32508
4c712b90c60a import-checker: convert localmods to a set of module names
Yuya Nishihara <yuya@tcha.org>
parents: 32507
diff changeset
   709
    localmodpaths = {}
20036
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   710
    used_imports = {}
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   711
    any_errors = False
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   712
    for source_path in argv[1:]:
32374
194b0f781132 import-checker: drop workaround for pure modules
Yuya Nishihara <yuya@tcha.org>
parents: 32372
diff changeset
   713
        modname = dotted_name_of_path(source_path)
32508
4c712b90c60a import-checker: convert localmods to a set of module names
Yuya Nishihara <yuya@tcha.org>
parents: 32507
diff changeset
   714
        localmodpaths[modname] = source_path
32509
a025ec43856c import-checker: guess names of C extension modules
Yuya Nishihara <yuya@tcha.org>
parents: 32508
diff changeset
   715
    localmods = populateextmods(localmodpaths)
32508
4c712b90c60a import-checker: convert localmods to a set of module names
Yuya Nishihara <yuya@tcha.org>
parents: 32507
diff changeset
   716
    for localmodname, source_path in sorted(localmodpaths.items()):
28922
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   717
        for src, modname, name, line in sources(source_path, localmodname):
28920
cdf331b54eb8 import-checker: track SyntaxErrors
timeless <timeless@mozdev.org>
parents: 28919
diff changeset
   718
            try:
cdf331b54eb8 import-checker: track SyntaxErrors
timeless <timeless@mozdev.org>
parents: 28919
diff changeset
   719
                used_imports[modname] = sorted(
28922
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   720
                    imported_modules(src, modname, name, localmods,
28920
cdf331b54eb8 import-checker: track SyntaxErrors
timeless <timeless@mozdev.org>
parents: 28919
diff changeset
   721
                                     ignore_nested=True))
cdf331b54eb8 import-checker: track SyntaxErrors
timeless <timeless@mozdev.org>
parents: 28919
diff changeset
   722
                for error, lineno in verify_import_convention(modname, src,
cdf331b54eb8 import-checker: track SyntaxErrors
timeless <timeless@mozdev.org>
parents: 28919
diff changeset
   723
                                                              localmods):
cdf331b54eb8 import-checker: track SyntaxErrors
timeless <timeless@mozdev.org>
parents: 28919
diff changeset
   724
                    any_errors = True
28922
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   725
                    print('%s:%d: %s' % (source_path, lineno + line, error))
28920
cdf331b54eb8 import-checker: track SyntaxErrors
timeless <timeless@mozdev.org>
parents: 28919
diff changeset
   726
            except SyntaxError as e:
cdf331b54eb8 import-checker: track SyntaxErrors
timeless <timeless@mozdev.org>
parents: 28919
diff changeset
   727
                print('%s:%d: SyntaxError: %s' %
28922
4ec62a084e5c import-checker: parse python code from .t files
timeless <timeless@mozdev.org>
parents: 28921
diff changeset
   728
                      (source_path, e.lineno + line, e))
20036
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   729
    cycles = find_cycles(used_imports)
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   730
    if cycles:
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   731
        firstmods = set()
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   732
        for c in sorted(cycles, key=_cycle_sortkey):
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   733
            first = c.split()[0]
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   734
            # As a rough cut, ignore any cycle that starts with the
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   735
            # same module as some other cycle. Otherwise we see lots
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   736
            # of cycles that are effectively duplicates.
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   737
            if first in firstmods:
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   738
                continue
28703
a274c4f9087a py3: use print_function in import-checker
timeless <timeless@mozdev.org>
parents: 28702
diff changeset
   739
            print('Import cycle:', c)
20036
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   740
            firstmods.add(first)
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   741
        any_errors = True
25731
cd1daab5d036 import-checker.py: exit with code 0 if no error is detected
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 25703
diff changeset
   742
    return any_errors != 0
20036
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   743
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   744
if __name__ == '__main__':
e5d51fa51aba contrib: add an import checker
Augie Fackler <raf@durin42.com>
parents:
diff changeset
   745
    sys.exit(int(main(sys.argv)))