Mercurial > public > mercurial-scm > hg-stable
annotate contrib/import-checker.py @ 26955:c4114e335b49
import-checker: extract function to generate a formatted warning
This is the stub to embed lineno. See the next patch for details.
| author | Yuya Nishihara <yuya@tcha.org> |
|---|---|
| date | Sun, 01 Nov 2015 15:39:25 +0900 |
| parents | f804bf27439b |
| children | 4b56214ebb7a |
| rev | line source |
|---|---|
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1 #!/usr/bin/env python |
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2 |
| 20036 | 3 import ast |
| 4 import os | |
| 5 import sys | |
| 6 | |
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7 # Import a minimal set of stdlib modules needed for list_stdlib_modules() |
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8 # to work when run from a virtualenv. The modules were chosen empirically |
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9 # so that the return value matches the return value without virtualenv. |
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10 import BaseHTTPServer |
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11 import zlib |
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12 |
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13 # Whitelist of modules that symbols can be directly imported from. |
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14 allowsymbolimports = ( |
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15 '__future__', |
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16 'mercurial.i18n', |
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17 'mercurial.node', |
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18 ) |
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19 |
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20 # Modules that must be aliased because they are commonly confused with |
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21 # common variables and can create aliasing and readability issues. |
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22 requirealias = { |
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23 'ui': 'uimod', |
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24 } |
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25 |
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26 def usingabsolute(root): |
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27 """Whether absolute imports are being used.""" |
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28 if sys.version_info[0] >= 3: |
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29 return True |
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30 |
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31 for node in ast.walk(root): |
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32 if isinstance(node, ast.ImportFrom): |
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33 if node.module == '__future__': |
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34 for n in node.names: |
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35 if n.name == 'absolute_import': |
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36 return True |
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37 |
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38 return False |
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39 |
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40 def dotted_name_of_path(path, trimpure=False): |
| 20036 | 41 """Given a relative path to a source file, return its dotted module name. |
| 42 | |
| 43 >>> dotted_name_of_path('mercurial/error.py') | |
| 44 'mercurial.error' | |
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45 >>> dotted_name_of_path('mercurial/pure/parsers.py', trimpure=True) |
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46 'mercurial.parsers' |
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47 >>> dotted_name_of_path('zlibmodule.so') |
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48 'zlib' |
| 20036 | 49 """ |
| 50 parts = path.split('/') | |
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51 parts[-1] = parts[-1].split('.', 1)[0] # remove .py and .so and .ARCH.so |
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52 if parts[-1].endswith('module'): |
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53 parts[-1] = parts[-1][:-6] |
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54 if trimpure: |
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55 return '.'.join(p for p in parts if p != 'pure') |
| 20036 | 56 return '.'.join(parts) |
| 57 | |
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58 def fromlocalfunc(modulename, localmods): |
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59 """Get a function to examine which locally defined module the |
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60 target source imports via a specified name. |
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61 |
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62 `modulename` is an `dotted_name_of_path()`-ed source file path, |
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63 which may have `.__init__` at the end of it, of the target source. |
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64 |
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65 `localmods` is a dict (or set), of which key is an absolute |
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66 `dotted_name_of_path()`-ed source file path of locally defined (= |
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67 Mercurial specific) modules. |
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68 |
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69 This function assumes that module names not existing in |
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70 `localmods` are from the Python standard library. |
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71 |
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72 This function returns the function, which takes `name` argument, |
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73 and returns `(absname, dottedpath, hassubmod)` tuple if `name` |
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74 matches against locally defined module. Otherwise, it returns |
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75 False. |
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76 |
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77 It is assumed that `name` doesn't have `.__init__`. |
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78 |
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79 `absname` is an absolute module name of specified `name` |
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80 (e.g. "hgext.convert"). This can be used to compose prefix for sub |
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81 modules or so. |
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82 |
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83 `dottedpath` is a `dotted_name_of_path()`-ed source file path |
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84 (e.g. "hgext.convert.__init__") of `name`. This is used to look |
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85 module up in `localmods` again. |
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86 |
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87 `hassubmod` is whether it may have sub modules under it (for |
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88 convenient, even though this is also equivalent to "absname != |
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89 dottednpath") |
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90 |
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91 >>> localmods = {'foo.__init__': True, 'foo.foo1': True, |
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92 ... 'foo.bar.__init__': True, 'foo.bar.bar1': True, |
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93 ... 'baz.__init__': True, 'baz.baz1': True } |
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94 >>> fromlocal = fromlocalfunc('foo.xxx', localmods) |
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95 >>> # relative |
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96 >>> fromlocal('foo1') |
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97 ('foo.foo1', 'foo.foo1', False) |
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98 >>> fromlocal('bar') |
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99 ('foo.bar', 'foo.bar.__init__', True) |
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100 >>> fromlocal('bar.bar1') |
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101 ('foo.bar.bar1', 'foo.bar.bar1', False) |
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102 >>> # absolute |
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103 >>> fromlocal('baz') |
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104 ('baz', 'baz.__init__', True) |
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105 >>> fromlocal('baz.baz1') |
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106 ('baz.baz1', 'baz.baz1', False) |
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107 >>> # unknown = maybe standard library |
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108 >>> fromlocal('os') |
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109 False |
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110 >>> fromlocal(None, 1) |
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111 ('foo', 'foo.__init__', True) |
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112 >>> fromlocal2 = fromlocalfunc('foo.xxx.yyy', localmods) |
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113 >>> fromlocal2(None, 2) |
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114 ('foo', 'foo.__init__', True) |
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115 """ |
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116 prefix = '.'.join(modulename.split('.')[:-1]) |
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117 if prefix: |
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118 prefix += '.' |
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119 def fromlocal(name, level=0): |
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120 # name is None when relative imports are used. |
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121 if name is None: |
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122 # If relative imports are used, level must not be absolute. |
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123 assert level > 0 |
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124 candidates = ['.'.join(modulename.split('.')[:-level])] |
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125 else: |
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126 # Check relative name first. |
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127 candidates = [prefix + name, name] |
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128 |
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129 for n in candidates: |
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130 if n in localmods: |
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131 return (n, n, False) |
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132 dottedpath = n + '.__init__' |
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133 if dottedpath in localmods: |
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134 return (n, dottedpath, True) |
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135 return False |
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136 return fromlocal |
| 20036 | 137 |
| 138 def list_stdlib_modules(): | |
| 139 """List the modules present in the stdlib. | |
| 140 | |
| 141 >>> mods = set(list_stdlib_modules()) | |
| 142 >>> 'BaseHTTPServer' in mods | |
| 143 True | |
| 144 | |
| 145 os.path isn't really a module, so it's missing: | |
| 146 | |
| 147 >>> 'os.path' in mods | |
| 148 False | |
| 149 | |
| 150 sys requires special treatment, because it's baked into the | |
| 151 interpreter, but it should still appear: | |
| 152 | |
| 153 >>> 'sys' in mods | |
| 154 True | |
| 155 | |
| 156 >>> 'collections' in mods | |
| 157 True | |
| 158 | |
| 159 >>> 'cStringIO' in mods | |
| 160 True | |
| 161 """ | |
| 162 for m in sys.builtin_module_names: | |
| 163 yield m | |
| 164 # These modules only exist on windows, but we should always | |
| 165 # consider them stdlib. | |
| 166 for m in ['msvcrt', '_winreg']: | |
| 167 yield m | |
| 168 # These get missed too | |
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169 for m in 'ctypes', 'email', 'multiprocessing': |
| 20036 | 170 yield m |
| 171 yield 'builtins' # python3 only | |
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172 for m in 'fcntl', 'grp', 'pwd', 'termios': # Unix only |
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173 yield m |
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174 stdlib_prefixes = set([sys.prefix, sys.exec_prefix]) |
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175 # We need to supplement the list of prefixes for the search to work |
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176 # when run from within a virtualenv. |
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177 for mod in (BaseHTTPServer, zlib): |
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178 try: |
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179 # Not all module objects have a __file__ attribute. |
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180 filename = mod.__file__ |
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181 except AttributeError: |
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182 continue |
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183 dirname = os.path.dirname(filename) |
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184 for prefix in stdlib_prefixes: |
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185 if dirname.startswith(prefix): |
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186 # Then this directory is redundant. |
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187 break |
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188 else: |
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189 stdlib_prefixes.add(dirname) |
| 20036 | 190 for libpath in sys.path: |
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191 # We want to walk everything in sys.path that starts with |
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192 # something in stdlib_prefixes. check-code suppressed because |
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193 # the ast module used by this script implies the availability |
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194 # of any(). |
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195 if not any(libpath.startswith(p) for p in stdlib_prefixes): # no-py24 |
| 20036 | 196 continue |
| 197 for top, dirs, files in os.walk(libpath): | |
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198 for i, d in reversed(list(enumerate(dirs))): |
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199 if (not os.path.exists(os.path.join(top, d, '__init__.py')) |
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200 or top == libpath and d in ('hgext', 'mercurial')): |
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201 del dirs[i] |
| 20036 | 202 for name in files: |
| 203 if name == '__init__.py': | |
| 204 continue | |
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205 if not name.endswith(('.py', '.so', '.pyc', '.pyo', '.pyd')): |
| 20036 | 206 continue |
| 207 full_path = os.path.join(top, name) | |
| 208 rel_path = full_path[len(libpath) + 1:] | |
| 209 mod = dotted_name_of_path(rel_path) | |
| 210 yield mod | |
| 211 | |
| 212 stdlib_modules = set(list_stdlib_modules()) | |
| 213 | |
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214 def imported_modules(source, modulename, localmods, ignore_nested=False): |
| 20036 | 215 """Given the source of a file as a string, yield the names |
| 216 imported by that file. | |
| 217 | |
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218 Args: |
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219 source: The python source to examine as a string. |
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220 modulename: of specified python source (may have `__init__`) |
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221 localmods: dict of locally defined module names (may have `__init__`) |
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222 ignore_nested: If true, import statements that do not start in |
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223 column zero will be ignored. |
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224 |
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225 Returns: |
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226 A list of absolute module names imported by the given source. |
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227 |
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228 >>> modulename = 'foo.xxx' |
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229 >>> localmods = {'foo.__init__': True, |
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230 ... 'foo.foo1': True, 'foo.foo2': True, |
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231 ... 'foo.bar.__init__': True, 'foo.bar.bar1': True, |
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232 ... 'baz.__init__': True, 'baz.baz1': True } |
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233 >>> # standard library (= not locally defined ones) |
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234 >>> sorted(imported_modules( |
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235 ... 'from stdlib1 import foo, bar; import stdlib2', |
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236 ... modulename, localmods)) |
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237 [] |
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238 >>> # relative importing |
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239 >>> sorted(imported_modules( |
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240 ... 'import foo1; from bar import bar1', |
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241 ... modulename, localmods)) |
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242 ['foo.bar.__init__', 'foo.bar.bar1', 'foo.foo1'] |
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243 >>> sorted(imported_modules( |
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244 ... 'from bar.bar1 import name1, name2, name3', |
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245 ... modulename, localmods)) |
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246 ['foo.bar.bar1'] |
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247 >>> # absolute importing |
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248 >>> sorted(imported_modules( |
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249 ... 'from baz import baz1, name1', |
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250 ... modulename, localmods)) |
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251 ['baz.__init__', 'baz.baz1'] |
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252 >>> # mixed importing, even though it shouldn't be recommended |
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253 >>> sorted(imported_modules( |
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254 ... 'import stdlib, foo1, baz', |
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255 ... modulename, localmods)) |
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256 ['baz.__init__', 'foo.foo1'] |
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257 >>> # ignore_nested |
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258 >>> sorted(imported_modules( |
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259 ... '''import foo |
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260 ... def wat(): |
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261 ... import bar |
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262 ... ''', modulename, localmods)) |
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263 ['foo.__init__', 'foo.bar.__init__'] |
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264 >>> sorted(imported_modules( |
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265 ... '''import foo |
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266 ... def wat(): |
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267 ... import bar |
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268 ... ''', modulename, localmods, ignore_nested=True)) |
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269 ['foo.__init__'] |
| 20036 | 270 """ |
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271 fromlocal = fromlocalfunc(modulename, localmods) |
| 20036 | 272 for node in ast.walk(ast.parse(source)): |
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273 if ignore_nested and getattr(node, 'col_offset', 0) > 0: |
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274 continue |
| 20036 | 275 if isinstance(node, ast.Import): |
| 276 for n in node.names: | |
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277 found = fromlocal(n.name) |
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278 if not found: |
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279 # this should import standard library |
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280 continue |
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281 yield found[1] |
| 20036 | 282 elif isinstance(node, ast.ImportFrom): |
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283 found = fromlocal(node.module, node.level) |
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284 if not found: |
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285 # this should import standard library |
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286 continue |
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287 |
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288 absname, dottedpath, hassubmod = found |
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289 yield dottedpath |
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290 if not hassubmod: |
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291 # examination of "node.names" should be redundant |
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292 # e.g.: from mercurial.node import nullid, nullrev |
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293 continue |
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294 |
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295 prefix = absname + '.' |
| 20036 | 296 for n in node.names: |
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297 found = fromlocal(prefix + n.name) |
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298 if not found: |
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299 # this should be a function or a property of "node.module" |
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300 continue |
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301 yield found[1] |
| 20036 | 302 |
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303 def verify_import_convention(module, source): |
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304 """Verify imports match our established coding convention. |
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305 |
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306 We have 2 conventions: legacy and modern. The modern convention is in |
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307 effect when using absolute imports. |
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308 |
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309 The legacy convention only looks for mixed imports. The modern convention |
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310 is much more thorough. |
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311 """ |
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312 root = ast.parse(source) |
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313 absolute = usingabsolute(root) |
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314 |
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315 if absolute: |
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316 return verify_modern_convention(module, root) |
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317 else: |
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318 return verify_stdlib_on_own_line(root) |
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319 |
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320 def verify_modern_convention(module, root): |
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321 """Verify a file conforms to the modern import convention rules. |
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322 |
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323 The rules of the modern convention are: |
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324 |
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325 * Ordering is stdlib followed by local imports. Each group is lexically |
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326 sorted. |
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327 * Importing multiple modules via "import X, Y" is not allowed: use |
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328 separate import statements. |
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329 * Importing multiple modules via "from X import ..." is allowed if using |
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330 parenthesis and one entry per line. |
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331 * Only 1 relative import statement per import level ("from .", "from ..") |
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332 is allowed. |
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333 * Relative imports from higher levels must occur before lower levels. e.g. |
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334 "from .." must be before "from .". |
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335 * Imports from peer packages should use relative import (e.g. do not |
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336 "import mercurial.foo" from a "mercurial.*" module). |
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337 * Symbols can only be imported from specific modules (see |
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338 `allowsymbolimports`). For other modules, first import the module then |
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339 assign the symbol to a module-level variable. In addition, these imports |
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340 must be performed before other relative imports. This rule only |
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341 applies to import statements outside of any blocks. |
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342 * Relative imports from the standard library are not allowed. |
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343 * Certain modules must be aliased to alternate names to avoid aliasing |
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344 and readability problems. See `requirealias`. |
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345 """ |
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346 topmodule = module.split('.')[0] |
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347 |
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348 # Whether a local/non-stdlib import has been performed. |
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349 seenlocal = False |
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350 # Whether a relative, non-symbol import has been seen. |
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351 seennonsymbolrelative = False |
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352 # The last name to be imported (for sorting). |
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353 lastname = None |
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354 # Relative import levels encountered so far. |
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355 seenlevels = set() |
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356 |
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357 for node in ast.walk(root): |
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358 def msg(fmt, *args): |
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359 return fmt % args |
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360 if isinstance(node, ast.Import): |
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361 # Disallow "import foo, bar" and require separate imports |
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362 # for each module. |
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363 if len(node.names) > 1: |
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364 yield msg('multiple imported names: %s', |
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365 ', '.join(n.name for n in node.names)) |
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366 |
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367 name = node.names[0].name |
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368 asname = node.names[0].asname |
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369 |
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370 # Ignore sorting rules on imports inside blocks. |
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371 if node.col_offset == 0: |
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372 if lastname and name < lastname: |
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373 yield msg('imports not lexically sorted: %s < %s', |
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374 name, lastname) |
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375 |
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376 lastname = name |
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377 |
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378 # stdlib imports should be before local imports. |
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379 stdlib = name in stdlib_modules |
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380 if stdlib and seenlocal and node.col_offset == 0: |
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381 yield msg('stdlib import follows local import: %s', name) |
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382 |
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383 if not stdlib: |
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384 seenlocal = True |
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385 |
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386 # Import of sibling modules should use relative imports. |
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387 topname = name.split('.')[0] |
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388 if topname == topmodule: |
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389 yield msg('import should be relative: %s', name) |
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390 |
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391 if name in requirealias and asname != requirealias[name]: |
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392 yield msg('%s module must be "as" aliased to %s', |
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393 name, requirealias[name]) |
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394 |
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395 elif isinstance(node, ast.ImportFrom): |
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396 # Resolve the full imported module name. |
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397 if node.level > 0: |
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398 fullname = '.'.join(module.split('.')[:-node.level]) |
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399 if node.module: |
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400 fullname += '.%s' % node.module |
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401 else: |
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402 assert node.module |
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403 fullname = node.module |
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404 |
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405 topname = fullname.split('.')[0] |
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406 if topname == topmodule: |
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407 yield msg('import should be relative: %s', fullname) |
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408 |
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409 # __future__ is special since it needs to come first and use |
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410 # symbol import. |
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411 if fullname != '__future__': |
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412 if not fullname or fullname in stdlib_modules: |
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413 yield msg('relative import of stdlib module') |
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414 else: |
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415 seenlocal = True |
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416 |
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417 # Direct symbol import is only allowed from certain modules and |
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418 # must occur before non-symbol imports. |
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419 if node.module and node.col_offset == 0: |
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420 if fullname not in allowsymbolimports: |
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421 yield msg('direct symbol import from %s', fullname) |
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422 |
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423 if seennonsymbolrelative: |
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424 yield msg('symbol import follows non-symbol import: %s', |
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425 fullname) |
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426 |
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427 if not node.module: |
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428 assert node.level |
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429 seennonsymbolrelative = True |
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430 |
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431 # Only allow 1 group per level. |
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432 if node.level in seenlevels and node.col_offset == 0: |
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433 yield msg('multiple "from %s import" statements', |
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434 '.' * node.level) |
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435 |
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436 # Higher-level groups come before lower-level groups. |
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437 if any(node.level > l for l in seenlevels): |
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438 yield msg('higher-level import should come first: %s', |
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439 fullname) |
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440 |
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441 seenlevels.add(node.level) |
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442 |
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443 # Entries in "from .X import ( ... )" lists must be lexically |
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444 # sorted. |
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445 lastentryname = None |
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446 |
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447 for n in node.names: |
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448 if lastentryname and n.name < lastentryname: |
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449 yield msg('imports from %s not lexically sorted: %s < %s', |
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450 fullname, n.name, lastentryname) |
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451 |
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452 lastentryname = n.name |
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453 |
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454 if n.name in requirealias and n.asname != requirealias[n.name]: |
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455 yield msg('%s from %s must be "as" aliased to %s', |
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456 n.name, fullname, requirealias[n.name]) |
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457 |
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458 def verify_stdlib_on_own_line(root): |
| 20036 | 459 """Given some python source, verify that stdlib imports are done |
| 460 in separate statements from relative local module imports. | |
| 461 | |
| 462 Observing this limitation is important as it works around an | |
| 463 annoying lib2to3 bug in relative import rewrites: | |
| 464 http://bugs.python.org/issue19510. | |
| 465 | |
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466 >>> list(verify_stdlib_on_own_line(ast.parse('import sys, foo'))) |
|
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467 ['mixed imports\\n stdlib: sys\\n relative: foo'] |
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468 >>> list(verify_stdlib_on_own_line(ast.parse('import sys, os'))) |
| 20036 | 469 [] |
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470 >>> list(verify_stdlib_on_own_line(ast.parse('import foo, bar'))) |
| 20036 | 471 [] |
| 472 """ | |
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473 for node in ast.walk(root): |
| 20036 | 474 if isinstance(node, ast.Import): |
|
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475 from_stdlib = {False: [], True: []} |
| 20036 | 476 for n in node.names: |
|
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477 from_stdlib[n.name in stdlib_modules].append(n.name) |
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478 if from_stdlib[True] and from_stdlib[False]: |
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479 yield ('mixed imports\n stdlib: %s\n relative: %s' % |
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480 (', '.join(sorted(from_stdlib[True])), |
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481 ', '.join(sorted(from_stdlib[False])))) |
| 20036 | 482 |
| 483 class CircularImport(Exception): | |
| 484 pass | |
| 485 | |
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486 def checkmod(mod, imports): |
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487 shortest = {} |
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488 visit = [[mod]] |
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489 while visit: |
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490 path = visit.pop(0) |
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491 for i in sorted(imports.get(path[-1], [])): |
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492 if len(path) < shortest.get(i, 1000): |
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493 shortest[i] = len(path) |
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494 if i in path: |
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495 if i == path[0]: |
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496 raise CircularImport(path) |
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497 continue |
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498 visit.append(path + [i]) |
| 20036 | 499 |
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500 def rotatecycle(cycle): |
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501 """arrange a cycle so that the lexicographically first module listed first |
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502 |
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503 >>> rotatecycle(['foo', 'bar']) |
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504 ['bar', 'foo', 'bar'] |
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505 """ |
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506 lowest = min(cycle) |
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507 idx = cycle.index(lowest) |
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508 return cycle[idx:] + cycle[:idx] + [lowest] |
| 20036 | 509 |
| 510 def find_cycles(imports): | |
| 511 """Find cycles in an already-loaded import graph. | |
| 512 | |
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513 All module names recorded in `imports` should be absolute one. |
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514 |
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515 >>> imports = {'top.foo': ['top.bar', 'os.path', 'top.qux'], |
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516 ... 'top.bar': ['top.baz', 'sys'], |
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517 ... 'top.baz': ['top.foo'], |
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518 ... 'top.qux': ['top.foo']} |
| 20036 | 519 >>> print '\\n'.join(sorted(find_cycles(imports))) |
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520 top.bar -> top.baz -> top.foo -> top.bar |
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521 top.foo -> top.qux -> top.foo |
| 20036 | 522 """ |
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523 cycles = set() |
| 20036 | 524 for mod in sorted(imports.iterkeys()): |
| 525 try: | |
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526 checkmod(mod, imports) |
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527 except CircularImport as e: |
| 20036 | 528 cycle = e.args[0] |
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529 cycles.add(" -> ".join(rotatecycle(cycle))) |
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530 return cycles |
| 20036 | 531 |
| 532 def _cycle_sortkey(c): | |
| 533 return len(c), c | |
| 534 | |
| 535 def main(argv): | |
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536 if len(argv) < 2 or (argv[1] == '-' and len(argv) > 2): |
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537 print 'Usage: %s {-|file [file] [file] ...}' |
| 20036 | 538 return 1 |
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539 if argv[1] == '-': |
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540 argv = argv[:1] |
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541 argv.extend(l.rstrip() for l in sys.stdin.readlines()) |
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542 localmods = {} |
| 20036 | 543 used_imports = {} |
| 544 any_errors = False | |
| 545 for source_path in argv[1:]: | |
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546 modname = dotted_name_of_path(source_path, trimpure=True) |
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547 localmods[modname] = source_path |
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548 for modname, source_path in sorted(localmods.iteritems()): |
| 20036 | 549 f = open(source_path) |
| 550 src = f.read() | |
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551 used_imports[modname] = sorted( |
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552 imported_modules(src, modname, localmods, ignore_nested=True)) |
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553 for error in verify_import_convention(modname, src): |
| 20036 | 554 any_errors = True |
| 555 print source_path, error | |
| 556 f.close() | |
| 557 cycles = find_cycles(used_imports) | |
| 558 if cycles: | |
| 559 firstmods = set() | |
| 560 for c in sorted(cycles, key=_cycle_sortkey): | |
| 561 first = c.split()[0] | |
| 562 # As a rough cut, ignore any cycle that starts with the | |
| 563 # same module as some other cycle. Otherwise we see lots | |
| 564 # of cycles that are effectively duplicates. | |
| 565 if first in firstmods: | |
| 566 continue | |
| 567 print 'Import cycle:', c | |
| 568 firstmods.add(first) | |
| 569 any_errors = True | |
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570 return any_errors != 0 |
| 20036 | 571 |
| 572 if __name__ == '__main__': | |
| 573 sys.exit(int(main(sys.argv))) |