Mercurial > hg
annotate contrib/import-checker.py @ 46444:6c778d20c8c2
rust: replace ToString impls with Display
ToString is automatically implementing for everything that implements
Display, and Display can avoid allocating intermediate strings.
Differential Revision: https://phab.mercurial-scm.org/D9904
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Thu, 28 Jan 2021 19:21:57 +0100 |
parents | c102b704edb5 |
children | 26127236b229 |
rev | line source |
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1 #!/usr/bin/env python3 |
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2 |
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3 from __future__ import absolute_import, print_function |
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4 |
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6 import collections |
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7 import io |
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9 import sys | |
10 | |
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11 # Import a minimal set of stdlib modules needed for list_stdlib_modules() |
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12 # to work when run from a virtualenv. The modules were chosen empirically |
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13 # so that the return value matches the return value without virtualenv. |
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14 if True: # disable lexical sorting checks |
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15 try: |
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16 import BaseHTTPServer as basehttpserver |
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17 except ImportError: |
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18 basehttpserver = None |
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19 import zlib |
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20 |
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21 import testparseutil |
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22 |
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23 # Whitelist of modules that symbols can be directly imported from. |
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24 allowsymbolimports = ( |
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25 '__future__', |
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26 'bzrlib', |
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27 'hgclient', |
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28 'mercurial', |
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29 'mercurial.hgweb.common', |
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30 'mercurial.hgweb.request', |
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31 'mercurial.i18n', |
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32 'mercurial.interfaces', |
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33 'mercurial.node', |
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34 'mercurial.pycompat', |
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35 # for revlog to re-export constant to extensions |
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36 'mercurial.revlogutils.constants', |
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37 'mercurial.revlogutils.flagutil', |
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38 # for cffi modules to re-export pure functions |
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39 'mercurial.pure.base85', |
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40 'mercurial.pure.bdiff', |
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41 'mercurial.pure.mpatch', |
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42 'mercurial.pure.osutil', |
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43 'mercurial.pure.parsers', |
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44 # third-party imports should be directly imported |
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45 'mercurial.thirdparty', |
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46 'mercurial.thirdparty.attr', |
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47 'mercurial.thirdparty.zope', |
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48 'mercurial.thirdparty.zope.interface', |
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49 ) |
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50 |
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51 # Whitelist of symbols that can be directly imported. |
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52 directsymbols = ('demandimport',) |
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53 |
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54 # Modules that must be aliased because they are commonly confused with |
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55 # common variables and can create aliasing and readability issues. |
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56 requirealias = { |
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57 'ui': 'uimod', |
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58 } |
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59 |
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60 |
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61 def usingabsolute(root): |
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62 """Whether absolute imports are being used.""" |
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63 if sys.version_info[0] >= 3: |
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64 return True |
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65 |
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66 for node in ast.walk(root): |
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67 if isinstance(node, ast.ImportFrom): |
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68 if node.module == '__future__': |
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69 for n in node.names: |
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70 if n.name == 'absolute_import': |
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71 return True |
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72 |
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73 return False |
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74 |
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75 |
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76 def walklocal(root): |
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77 """Recursively yield all descendant nodes but not in a different scope""" |
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78 todo = collections.deque(ast.iter_child_nodes(root)) |
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79 yield root, False |
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80 while todo: |
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81 node = todo.popleft() |
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82 newscope = isinstance(node, ast.FunctionDef) |
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83 if not newscope: |
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84 todo.extend(ast.iter_child_nodes(node)) |
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85 yield node, newscope |
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86 |
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87 |
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88 def dotted_name_of_path(path): |
20036 | 89 """Given a relative path to a source file, return its dotted module name. |
90 | |
91 >>> dotted_name_of_path('mercurial/error.py') | |
92 'mercurial.error' | |
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93 >>> dotted_name_of_path('zlibmodule.so') |
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94 'zlib' |
20036 | 95 """ |
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96 parts = path.replace(os.sep, '/').split('/') |
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97 parts[-1] = parts[-1].split('.', 1)[0] # remove .py and .so and .ARCH.so |
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98 if parts[-1].endswith('module'): |
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99 parts[-1] = parts[-1][:-6] |
20036 | 100 return '.'.join(parts) |
101 | |
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102 |
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103 def fromlocalfunc(modulename, localmods): |
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104 """Get a function to examine which locally defined module the |
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105 target source imports via a specified name. |
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106 |
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107 `modulename` is an `dotted_name_of_path()`-ed source file path, |
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108 which may have `.__init__` at the end of it, of the target source. |
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109 |
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110 `localmods` is a set of absolute `dotted_name_of_path()`-ed source file |
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111 paths of locally defined (= Mercurial specific) modules. |
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112 |
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113 This function assumes that module names not existing in |
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114 `localmods` are from the Python standard library. |
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115 |
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116 This function returns the function, which takes `name` argument, |
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117 and returns `(absname, dottedpath, hassubmod)` tuple if `name` |
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118 matches against locally defined module. Otherwise, it returns |
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119 False. |
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120 |
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121 It is assumed that `name` doesn't have `.__init__`. |
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122 |
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123 `absname` is an absolute module name of specified `name` |
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124 (e.g. "hgext.convert"). This can be used to compose prefix for sub |
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125 modules or so. |
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126 |
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127 `dottedpath` is a `dotted_name_of_path()`-ed source file path |
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128 (e.g. "hgext.convert.__init__") of `name`. This is used to look |
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129 module up in `localmods` again. |
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130 |
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131 `hassubmod` is whether it may have sub modules under it (for |
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132 convenient, even though this is also equivalent to "absname != |
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133 dottednpath") |
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134 |
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135 >>> localmods = {'foo.__init__', 'foo.foo1', |
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136 ... 'foo.bar.__init__', 'foo.bar.bar1', |
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137 ... 'baz.__init__', 'baz.baz1'} |
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138 >>> fromlocal = fromlocalfunc('foo.xxx', localmods) |
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139 >>> # relative |
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140 >>> fromlocal('foo1') |
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141 ('foo.foo1', 'foo.foo1', False) |
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142 >>> fromlocal('bar') |
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143 ('foo.bar', 'foo.bar.__init__', True) |
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144 >>> fromlocal('bar.bar1') |
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145 ('foo.bar.bar1', 'foo.bar.bar1', False) |
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146 >>> # absolute |
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147 >>> fromlocal('baz') |
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148 ('baz', 'baz.__init__', True) |
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149 >>> fromlocal('baz.baz1') |
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150 ('baz.baz1', 'baz.baz1', False) |
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151 >>> # unknown = maybe standard library |
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152 >>> fromlocal('os') |
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153 False |
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154 >>> fromlocal(None, 1) |
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155 ('foo', 'foo.__init__', True) |
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156 >>> fromlocal('foo1', 1) |
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157 ('foo.foo1', 'foo.foo1', False) |
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158 >>> fromlocal2 = fromlocalfunc('foo.xxx.yyy', localmods) |
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159 >>> fromlocal2(None, 2) |
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160 ('foo', 'foo.__init__', True) |
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161 >>> fromlocal2('bar2', 1) |
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162 False |
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163 >>> fromlocal2('bar', 2) |
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164 ('foo.bar', 'foo.bar.__init__', True) |
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165 """ |
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166 if not isinstance(modulename, str): |
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167 modulename = modulename.decode('ascii') |
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168 prefix = '.'.join(modulename.split('.')[:-1]) |
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169 if prefix: |
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170 prefix += '.' |
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171 |
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172 def fromlocal(name, level=0): |
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173 # name is false value when relative imports are used. |
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174 if not name: |
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175 # If relative imports are used, level must not be absolute. |
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176 assert level > 0 |
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177 candidates = ['.'.join(modulename.split('.')[:-level])] |
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178 else: |
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179 if not level: |
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180 # Check relative name first. |
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181 candidates = [prefix + name, name] |
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182 else: |
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183 candidates = [ |
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184 '.'.join(modulename.split('.')[:-level]) + '.' + name |
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185 ] |
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186 |
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187 for n in candidates: |
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188 if n in localmods: |
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189 return (n, n, False) |
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190 dottedpath = n + '.__init__' |
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191 if dottedpath in localmods: |
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192 return (n, dottedpath, True) |
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193 return False |
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194 |
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195 return fromlocal |
20036 | 196 |
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197 |
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198 def populateextmods(localmods): |
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199 """Populate C extension modules based on pure modules""" |
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200 newlocalmods = set(localmods) |
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201 for n in localmods: |
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202 if n.startswith('mercurial.pure.'): |
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203 m = n[len('mercurial.pure.') :] |
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204 newlocalmods.add('mercurial.cext.' + m) |
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205 newlocalmods.add('mercurial.cffi._' + m) |
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206 return newlocalmods |
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207 |
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208 |
20036 | 209 def list_stdlib_modules(): |
210 """List the modules present in the stdlib. | |
211 | |
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212 >>> py3 = sys.version_info[0] >= 3 |
20036 | 213 >>> mods = set(list_stdlib_modules()) |
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214 >>> 'BaseHTTPServer' in mods or py3 |
20036 | 215 True |
216 | |
217 os.path isn't really a module, so it's missing: | |
218 | |
219 >>> 'os.path' in mods | |
220 False | |
221 | |
222 sys requires special treatment, because it's baked into the | |
223 interpreter, but it should still appear: | |
224 | |
225 >>> 'sys' in mods | |
226 True | |
227 | |
228 >>> 'collections' in mods | |
229 True | |
230 | |
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231 >>> 'cStringIO' in mods or py3 |
20036 | 232 True |
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233 |
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234 >>> 'cffi' in mods |
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235 True |
20036 | 236 """ |
237 for m in sys.builtin_module_names: | |
238 yield m | |
239 # These modules only exist on windows, but we should always | |
240 # consider them stdlib. | |
241 for m in ['msvcrt', '_winreg']: | |
242 yield m | |
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243 yield '__builtin__' |
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244 yield 'builtins' # python3 only |
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245 yield 'importlib.abc' # python3 only |
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246 yield 'importlib.machinery' # python3 only |
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247 yield 'importlib.util' # python3 only |
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248 for m in 'fcntl', 'grp', 'pwd', 'termios': # Unix only |
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249 yield m |
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250 for m in 'cPickle', 'datetime': # in Python (not C) on PyPy |
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251 yield m |
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252 for m in ['cffi']: |
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253 yield m |
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254 stdlib_prefixes = {sys.prefix, sys.exec_prefix} |
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255 # We need to supplement the list of prefixes for the search to work |
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256 # when run from within a virtualenv. |
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257 for mod in (basehttpserver, zlib): |
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258 if mod is None: |
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259 continue |
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260 try: |
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261 # Not all module objects have a __file__ attribute. |
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262 filename = mod.__file__ |
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263 except AttributeError: |
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264 continue |
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265 dirname = os.path.dirname(filename) |
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266 for prefix in stdlib_prefixes: |
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267 if dirname.startswith(prefix): |
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268 # Then this directory is redundant. |
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269 break |
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270 else: |
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271 stdlib_prefixes.add(dirname) |
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272 sourceroot = os.path.abspath(os.path.dirname(os.path.dirname(__file__))) |
20036 | 273 for libpath in sys.path: |
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274 # We want to walk everything in sys.path that starts with something in |
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275 # stdlib_prefixes, but not directories from the hg sources. |
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276 if os.path.abspath(libpath).startswith(sourceroot) or not any( |
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277 libpath.startswith(p) for p in stdlib_prefixes |
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278 ): |
20036 | 279 continue |
280 for top, dirs, files in os.walk(libpath): | |
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281 for i, d in reversed(list(enumerate(dirs))): |
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282 if ( |
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283 not os.path.exists(os.path.join(top, d, '__init__.py')) |
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284 or top == libpath |
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285 and d in ('hgdemandimport', 'hgext', 'mercurial') |
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286 ): |
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287 del dirs[i] |
20036 | 288 for name in files: |
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289 if not name.endswith(('.py', '.so', '.pyc', '.pyo', '.pyd')): |
20036 | 290 continue |
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291 if name.startswith('__init__.py'): |
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292 full_path = top |
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293 else: |
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294 full_path = os.path.join(top, name) |
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295 rel_path = full_path[len(libpath) + 1 :] |
20036 | 296 mod = dotted_name_of_path(rel_path) |
297 yield mod | |
298 | |
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299 |
20036 | 300 stdlib_modules = set(list_stdlib_modules()) |
301 | |
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302 |
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303 def imported_modules(source, modulename, f, localmods, ignore_nested=False): |
20036 | 304 """Given the source of a file as a string, yield the names |
305 imported by that file. | |
306 | |
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307 Args: |
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308 source: The python source to examine as a string. |
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309 modulename: of specified python source (may have `__init__`) |
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310 localmods: set of locally defined module names (may have `__init__`) |
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311 ignore_nested: If true, import statements that do not start in |
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312 column zero will be ignored. |
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313 |
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314 Returns: |
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315 A list of absolute module names imported by the given source. |
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316 |
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317 >>> f = 'foo/xxx.py' |
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318 >>> modulename = 'foo.xxx' |
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319 >>> localmods = {'foo.__init__': True, |
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320 ... 'foo.foo1': True, 'foo.foo2': True, |
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321 ... 'foo.bar.__init__': True, 'foo.bar.bar1': True, |
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322 ... 'baz.__init__': True, 'baz.baz1': True } |
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323 >>> # standard library (= not locally defined ones) |
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324 >>> sorted(imported_modules( |
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325 ... 'from stdlib1 import foo, bar; import stdlib2', |
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326 ... modulename, f, localmods)) |
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327 [] |
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328 >>> # relative importing |
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329 >>> sorted(imported_modules( |
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330 ... 'import foo1; from bar import bar1', |
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331 ... modulename, f, localmods)) |
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332 ['foo.bar.bar1', 'foo.foo1'] |
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333 >>> sorted(imported_modules( |
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334 ... 'from bar.bar1 import name1, name2, name3', |
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335 ... modulename, f, localmods)) |
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336 ['foo.bar.bar1'] |
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337 >>> # absolute importing |
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338 >>> sorted(imported_modules( |
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339 ... 'from baz import baz1, name1', |
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340 ... modulename, f, localmods)) |
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341 ['baz.__init__', 'baz.baz1'] |
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342 >>> # mixed importing, even though it shouldn't be recommended |
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343 >>> sorted(imported_modules( |
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344 ... 'import stdlib, foo1, baz', |
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345 ... modulename, f, localmods)) |
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346 ['baz.__init__', 'foo.foo1'] |
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347 >>> # ignore_nested |
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348 >>> sorted(imported_modules( |
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349 ... '''import foo |
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350 ... def wat(): |
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351 ... import bar |
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352 ... ''', modulename, f, localmods)) |
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353 ['foo.__init__', 'foo.bar.__init__'] |
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354 >>> sorted(imported_modules( |
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355 ... '''import foo |
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356 ... def wat(): |
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357 ... import bar |
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358 ... ''', modulename, f, localmods, ignore_nested=True)) |
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359 ['foo.__init__'] |
20036 | 360 """ |
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361 fromlocal = fromlocalfunc(modulename, localmods) |
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362 for node in ast.walk(ast.parse(source, f)): |
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363 if ignore_nested and getattr(node, 'col_offset', 0) > 0: |
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364 continue |
20036 | 365 if isinstance(node, ast.Import): |
366 for n in node.names: | |
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367 found = fromlocal(n.name) |
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368 if not found: |
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369 # this should import standard library |
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370 continue |
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371 yield found[1] |
20036 | 372 elif isinstance(node, ast.ImportFrom): |
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373 found = fromlocal(node.module, node.level) |
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374 if not found: |
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375 # this should import standard library |
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376 continue |
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377 |
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378 absname, dottedpath, hassubmod = found |
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379 if not hassubmod: |
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380 # "dottedpath" is not a package; must be imported |
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381 yield dottedpath |
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382 # examination of "node.names" should be redundant |
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383 # e.g.: from mercurial.node import nullid, nullrev |
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384 continue |
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385 |
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386 modnotfound = False |
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387 prefix = absname + '.' |
20036 | 388 for n in node.names: |
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389 found = fromlocal(prefix + n.name) |
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390 if not found: |
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391 # this should be a function or a property of "node.module" |
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392 modnotfound = True |
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393 continue |
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394 yield found[1] |
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395 if modnotfound and dottedpath != modulename: |
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396 # "dottedpath" is a package, but imported because of non-module |
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397 # lookup |
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398 # specifically allow "from . import foo" from __init__.py |
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399 yield dottedpath |
20036 | 400 |
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|
401 |
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402 def verify_import_convention(module, source, localmods): |
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403 """Verify imports match our established coding convention. |
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404 |
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405 We have 2 conventions: legacy and modern. The modern convention is in |
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406 effect when using absolute imports. |
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407 |
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408 The legacy convention only looks for mixed imports. The modern convention |
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409 is much more thorough. |
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410 """ |
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411 root = ast.parse(source) |
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412 absolute = usingabsolute(root) |
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413 |
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414 if absolute: |
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415 return verify_modern_convention(module, root, localmods) |
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416 else: |
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417 return verify_stdlib_on_own_line(root) |
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418 |
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419 |
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420 def verify_modern_convention(module, root, localmods, root_col_offset=0): |
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421 """Verify a file conforms to the modern import convention rules. |
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|
422 |
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|
423 The rules of the modern convention are: |
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|
424 |
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|
425 * Ordering is stdlib followed by local imports. Each group is lexically |
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|
426 sorted. |
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|
427 * Importing multiple modules via "import X, Y" is not allowed: use |
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|
428 separate import statements. |
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|
429 * Importing multiple modules via "from X import ..." is allowed if using |
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|
430 parenthesis and one entry per line. |
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|
431 * Only 1 relative import statement per import level ("from .", "from ..") |
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|
432 is allowed. |
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|
433 * Relative imports from higher levels must occur before lower levels. e.g. |
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434 "from .." must be before "from .". |
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|
435 * Imports from peer packages should use relative import (e.g. do not |
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|
436 "import mercurial.foo" from a "mercurial.*" module). |
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437 * Symbols can only be imported from specific modules (see |
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|
438 `allowsymbolimports`). For other modules, first import the module then |
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|
439 assign the symbol to a module-level variable. In addition, these imports |
29208
cba8bc11ed10
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29207
diff
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|
440 must be performed before other local imports. This rule only |
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|
441 applies to import statements outside of any blocks. |
34038
bc2535238de2
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Jun Wu <quark@fb.com>
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diff
changeset
|
442 * Relative imports from the standard library are not allowed, unless that |
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443 library is also a local module. |
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444 * Certain modules must be aliased to alternate names to avoid aliasing |
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445 and readability problems. See `requirealias`. |
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|
446 """ |
33890
3de9a2df6411
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|
447 if not isinstance(module, str): |
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|
448 module = module.decode('ascii') |
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449 topmodule = module.split('.')[0] |
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450 fromlocal = fromlocalfunc(module, localmods) |
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|
451 |
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|
452 # Whether a local/non-stdlib import has been performed. |
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import-checker: report local with stdlib late warning
timeless <timeless@mozdev.org>
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|
453 seenlocal = None |
29208
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454 # Whether a local/non-stdlib, non-symbol import has been seen. |
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455 seennonsymbollocal = False |
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456 # The last name to be imported (for sorting). |
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|
457 lastname = None |
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import-checker: do not enforce lexical sort accross stdlib/local boundary
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|
458 laststdlib = None |
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459 # Relative import levels encountered so far. |
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460 seenlevels = set() |
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461 |
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462 for node, newscope in walklocal(root): |
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|
463 |
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|
464 def msg(fmt, *args): |
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465 return (fmt % args, node.lineno) |
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466 |
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467 if newscope: |
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468 # Check for local imports in function |
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469 for r in verify_modern_convention( |
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470 module, node, localmods, node.col_offset + 4 |
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471 ): |
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472 yield r |
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473 elif isinstance(node, ast.Import): |
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474 # Disallow "import foo, bar" and require separate imports |
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475 # for each module. |
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476 if len(node.names) > 1: |
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|
477 yield msg( |
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|
478 'multiple imported names: %s', |
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479 ', '.join(n.name for n in node.names), |
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|
480 ) |
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|
481 |
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import-checker: establish modern import convention
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|
482 name = node.names[0].name |
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diff
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|
483 asname = node.names[0].asname |
1a6a117d0b95
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25702
diff
changeset
|
484 |
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
|
485 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
|
486 |
25703
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parents:
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diff
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|
487 # Ignore sorting rules on imports inside blocks. |
26965
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import-checker: reset context to verify convention in function scope
Yuya Nishihara <yuya@tcha.org>
parents:
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|
488 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
|
489 if lastname and name < lastname and laststdlib == stdlib: |
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|
490 yield msg( |
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parents:
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|
491 'imports not lexically sorted: %s < %s', name, lastname |
57875cf423c9
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changeset
|
492 ) |
25703
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
493 |
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
|
494 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
|
495 laststdlib = stdlib |
25703
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
496 |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
497 # stdlib imports should be before local imports. |
26965
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Yuya Nishihara <yuya@tcha.org>
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|
498 if stdlib and seenlocal and node.col_offset == root_col_offset: |
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Augie Fackler <augie@google.com>
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|
499 yield msg( |
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changeset
|
500 'stdlib import "%s" follows local import: %s', |
57875cf423c9
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diff
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|
501 name, |
57875cf423c9
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parents:
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diff
changeset
|
502 seenlocal, |
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style: run a patched black on a subset of mercurial
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parents:
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|
503 ) |
25703
1a6a117d0b95
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
504 |
1a6a117d0b95
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25702
diff
changeset
|
505 if not stdlib: |
28330
f3fb24e36d61
import-checker: report local with stdlib late warning
timeless <timeless@mozdev.org>
parents:
27621
diff
changeset
|
506 seenlocal = name |
25703
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
507 |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
508 # Import of sibling modules should use relative imports. |
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import-checker: establish modern import convention
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diff
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|
509 topname = name.split('.')[0] |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
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diff
changeset
|
510 if topname == topmodule: |
26955
c4114e335b49
import-checker: extract function to generate a formatted warning
Yuya Nishihara <yuya@tcha.org>
parents:
26954
diff
changeset
|
511 yield msg('import should be relative: %s', name) |
25703
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import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
512 |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
513 if name in requirealias and asname != requirealias[name]: |
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57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
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|
514 yield msg( |
57875cf423c9
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changeset
|
515 '%s module must be "as" aliased to %s', |
57875cf423c9
style: run a patched black on a subset of mercurial
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parents:
42813
diff
changeset
|
516 name, |
57875cf423c9
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Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
517 requirealias[name], |
57875cf423c9
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parents:
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diff
changeset
|
518 ) |
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import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
519 |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
520 elif isinstance(node, ast.ImportFrom): |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
521 # Resolve the full imported module name. |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
522 if node.level > 0: |
43075
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parents:
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diff
changeset
|
523 fullname = '.'.join(module.split('.')[: -node.level]) |
25703
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import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
524 if node.module: |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
525 fullname += '.%s' % node.module |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
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diff
changeset
|
526 else: |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
527 assert node.module |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
528 fullname = node.module |
1a6a117d0b95
import-checker: establish modern import convention
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parents:
25702
diff
changeset
|
529 |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
530 topname = fullname.split('.')[0] |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
531 if topname == topmodule: |
26955
c4114e335b49
import-checker: extract function to generate a formatted warning
Yuya Nishihara <yuya@tcha.org>
parents:
26954
diff
changeset
|
532 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
|
533 |
1a6a117d0b95
import-checker: establish modern import convention
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parents:
25702
diff
changeset
|
534 # __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
|
535 # symbol import. |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
536 if fullname != '__future__': |
34038
bc2535238de2
import-checker: allow relative import a module being checked
Jun Wu <quark@fb.com>
parents:
33920
diff
changeset
|
537 if not fullname or ( |
bc2535238de2
import-checker: allow relative import a module being checked
Jun Wu <quark@fb.com>
parents:
33920
diff
changeset
|
538 fullname in stdlib_modules |
43596
0ad5d6c4bfad
import-checker: allow 'from typing import ...'
Yuya Nishihara <yuya@tcha.org>
parents:
43415
diff
changeset
|
539 # allow standard 'from typing import ...' style |
43954
303576116ac1
import-checker: allow all absolute imports of stdlib modules
Martin von Zweigbergk <martinvonz@google.com>
parents:
43596
diff
changeset
|
540 and fullname.startswith('.') |
34038
bc2535238de2
import-checker: allow relative import a module being checked
Jun Wu <quark@fb.com>
parents:
33920
diff
changeset
|
541 and fullname not in localmods |
43075
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Augie Fackler <augie@google.com>
parents:
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diff
changeset
|
542 and fullname + '.__init__' not in localmods |
57875cf423c9
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Augie Fackler <augie@google.com>
parents:
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diff
changeset
|
543 ): |
26955
c4114e335b49
import-checker: extract function to generate a formatted warning
Yuya Nishihara <yuya@tcha.org>
parents:
26954
diff
changeset
|
544 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
|
545 else: |
28330
f3fb24e36d61
import-checker: report local with stdlib late warning
timeless <timeless@mozdev.org>
parents:
27621
diff
changeset
|
546 seenlocal = fullname |
25703
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
547 |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
548 # 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
|
549 # 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
|
550 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
|
551 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
|
552 prefix = found[0] + '.' |
43075
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
553 symbols = ( |
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
554 n.name for n in node.names if not fromlocal(prefix + n.name) |
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
555 ) |
29207
a09098c61fea
import-checker: always build a list of imported symbols
Yuya Nishihara <yuya@tcha.org>
parents:
29122
diff
changeset
|
556 else: |
32419
d02888308235
import-checker: add a way to directly import certain symbols
Siddharth Agarwal <sid0@fb.com>
parents:
32374
diff
changeset
|
557 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
|
558 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
|
559 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
|
560 if symbols and fullname not in allowsymbolimports: |
43075
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
561 yield msg( |
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
562 'direct symbol import %s from %s', |
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
563 ', '.join(symbols), |
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
564 fullname, |
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
565 ) |
25703
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
566 |
29208
cba8bc11ed10
import-checker: extend check of symbol-import order to all local modules
Yuya Nishihara <yuya@tcha.org>
parents:
29207
diff
changeset
|
567 if symbols and seennonsymbollocal: |
43075
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
568 yield msg( |
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
569 'symbol import follows non-symbol import: %s', fullname |
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
570 ) |
29208
cba8bc11ed10
import-checker: extend check of symbol-import order to all local modules
Yuya Nishihara <yuya@tcha.org>
parents:
29207
diff
changeset
|
571 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
|
572 seennonsymbollocal = True |
25703
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
573 |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
574 if not node.module: |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
575 assert node.level |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
576 |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
577 # Only allow 1 group per level. |
43075
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
578 if ( |
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
579 node.level in seenlevels |
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
580 and node.col_offset == root_col_offset |
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
581 ): |
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
582 yield msg( |
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
583 'multiple "from %s import" statements', '.' * node.level |
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
584 ) |
25703
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
585 |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
586 # 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
|
587 if any(node.level > l for l in seenlevels): |
43075
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
588 yield msg( |
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
589 'higher-level import should come first: %s', fullname |
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
590 ) |
25703
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
591 |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
592 seenlevels.add(node.level) |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
593 |
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594 # Entries in "from .X import ( ... )" lists must be lexically |
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595 # sorted. |
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596 lastentryname = None |
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597 |
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598 for n in node.names: |
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599 if lastentryname and n.name < lastentryname: |
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600 yield msg( |
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601 'imports from %s not lexically sorted: %s < %s', |
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602 fullname, |
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603 n.name, |
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604 lastentryname, |
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605 ) |
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606 |
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607 lastentryname = n.name |
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608 |
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609 if n.name in requirealias and n.asname != requirealias[n.name]: |
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610 yield msg( |
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611 '%s from %s must be "as" aliased to %s', |
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612 n.name, |
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613 fullname, |
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614 requirealias[n.name], |
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615 ) |
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616 |
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617 |
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618 def verify_stdlib_on_own_line(root): |
20036 | 619 """Given some python source, verify that stdlib imports are done |
620 in separate statements from relative local module imports. | |
621 | |
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622 >>> list(verify_stdlib_on_own_line(ast.parse('import sys, foo'))) |
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623 [('mixed imports\\n stdlib: sys\\n relative: foo', 1)] |
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624 >>> list(verify_stdlib_on_own_line(ast.parse('import sys, os'))) |
20036 | 625 [] |
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626 >>> list(verify_stdlib_on_own_line(ast.parse('import foo, bar'))) |
20036 | 627 [] |
628 """ | |
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629 for node in ast.walk(root): |
20036 | 630 if isinstance(node, ast.Import): |
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631 from_stdlib = {False: [], True: []} |
20036 | 632 for n in node.names: |
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633 from_stdlib[n.name in stdlib_modules].append(n.name) |
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634 if from_stdlib[True] and from_stdlib[False]: |
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635 yield ( |
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636 'mixed imports\n stdlib: %s\n relative: %s' |
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637 % ( |
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638 ', '.join(sorted(from_stdlib[True])), |
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639 ', '.join(sorted(from_stdlib[False])), |
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640 ), |
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641 node.lineno, |
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642 ) |
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643 |
20036 | 644 |
645 class CircularImport(Exception): | |
646 pass | |
647 | |
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648 |
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649 def checkmod(mod, imports): |
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650 shortest = {} |
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651 visit = [[mod]] |
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652 while visit: |
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653 path = visit.pop(0) |
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654 for i in sorted(imports.get(path[-1], [])): |
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655 if len(path) < shortest.get(i, 1000): |
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656 shortest[i] = len(path) |
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657 if i in path: |
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658 if i == path[0]: |
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659 raise CircularImport(path) |
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660 continue |
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661 visit.append(path + [i]) |
20036 | 662 |
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663 |
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664 def rotatecycle(cycle): |
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665 """arrange a cycle so that the lexicographically first module listed first |
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666 |
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667 >>> rotatecycle(['foo', 'bar']) |
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668 ['bar', 'foo', 'bar'] |
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669 """ |
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670 lowest = min(cycle) |
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671 idx = cycle.index(lowest) |
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672 return cycle[idx:] + cycle[:idx] + [lowest] |
20036 | 673 |
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674 |
20036 | 675 def find_cycles(imports): |
676 """Find cycles in an already-loaded import graph. | |
677 | |
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678 All module names recorded in `imports` should be absolute one. |
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679 |
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680 >>> from __future__ import print_function |
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681 >>> imports = {'top.foo': ['top.bar', 'os.path', 'top.qux'], |
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682 ... 'top.bar': ['top.baz', 'sys'], |
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683 ... 'top.baz': ['top.foo'], |
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684 ... 'top.qux': ['top.foo']} |
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685 >>> print('\\n'.join(sorted(find_cycles(imports)))) |
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686 top.bar -> top.baz -> top.foo -> top.bar |
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687 top.foo -> top.qux -> top.foo |
20036 | 688 """ |
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689 cycles = set() |
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690 for mod in sorted(imports.keys()): |
20036 | 691 try: |
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692 checkmod(mod, imports) |
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693 except CircularImport as e: |
20036 | 694 cycle = e.args[0] |
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695 cycles.add(" -> ".join(rotatecycle(cycle))) |
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696 return cycles |
20036 | 697 |
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698 |
20036 | 699 def _cycle_sortkey(c): |
700 return len(c), c | |
701 | |
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702 |
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703 def embedded(f, modname, src): |
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704 """Extract embedded python code |
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705 |
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706 >>> def _forcestr(thing): |
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707 ... if not isinstance(thing, str): |
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708 ... return thing.decode('ascii') |
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709 ... return thing |
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710 >>> def test(fn, lines): |
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711 ... for s, m, f, l in embedded(fn, b"example", lines): |
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712 ... print("%s %s %d" % (_forcestr(m), _forcestr(f), l)) |
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713 ... print(repr(_forcestr(s))) |
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714 >>> lines = [ |
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715 ... 'comment', |
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716 ... ' >>> from __future__ import print_function', |
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717 ... " >>> ' multiline", |
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718 ... " ... string'", |
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719 ... ' ', |
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720 ... 'comment', |
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721 ... ' $ cat > foo.py <<EOF', |
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722 ... ' > from __future__ import print_function', |
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723 ... ' > EOF', |
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724 ... ] |
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725 >>> test(b"example.t", lines) |
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726 example[2] doctest.py 1 |
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727 "from __future__ import print_function\\n' multiline\\nstring'\\n\\n" |
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728 example[8] foo.py 7 |
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729 'from __future__ import print_function\\n' |
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730 """ |
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731 errors = [] |
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732 for name, starts, ends, code in testparseutil.pyembedded(f, src, errors): |
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733 if not name: |
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734 # use 'doctest.py', in order to make already existing |
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735 # doctest above pass instantly |
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736 name = 'doctest.py' |
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737 # "starts" is "line number" (1-origin), but embedded() is |
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738 # expected to return "line offset" (0-origin). Therefore, this |
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739 # yields "starts - 1". |
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740 if not isinstance(modname, str): |
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741 modname = modname.decode('utf8') |
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742 yield code, "%s[%d]" % (modname, starts), name, starts - 1 |
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743 |
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744 |
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745 def sources(f, modname): |
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746 """Yields possibly multiple sources from a filepath |
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747 |
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748 input: filepath, modulename |
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749 yields: script(string), modulename, filepath, linenumber |
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750 |
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751 For embedded scripts, the modulename and filepath will be different |
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752 from the function arguments. linenumber is an offset relative to |
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753 the input file. |
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754 """ |
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755 py = False |
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756 if not f.endswith('.t'): |
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757 with open(f, 'rb') as src: |
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758 yield src.read(), modname, f, 0 |
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759 py = True |
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760 if py or f.endswith('.t'): |
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761 # Strictly speaking we should sniff for the magic header that denotes |
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762 # Python source file encoding. But in reality we don't use anything |
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763 # other than ASCII (mainly) and UTF-8 (in a few exceptions), so |
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764 # simplicity is fine. |
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765 with io.open(f, 'r', encoding='utf-8') as src: |
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766 for script, modname, t, line in embedded(f, modname, src): |
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767 yield script, modname.encode('utf8'), t, line |
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768 |
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769 |
20036 | 770 def main(argv): |
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771 if len(argv) < 2 or (argv[1] == '-' and len(argv) > 2): |
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772 print('Usage: %s {-|file [file] [file] ...}') |
20036 | 773 return 1 |
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774 if argv[1] == '-': |
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775 argv = argv[:1] |
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776 argv.extend(l.rstrip() for l in sys.stdin.readlines()) |
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777 localmodpaths = {} |
20036 | 778 used_imports = {} |
779 any_errors = False | |
780 for source_path in argv[1:]: | |
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781 modname = dotted_name_of_path(source_path) |
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782 localmodpaths[modname] = source_path |
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783 localmods = populateextmods(localmodpaths) |
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784 for localmodname, source_path in sorted(localmodpaths.items()): |
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785 if not isinstance(localmodname, bytes): |
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786 # This is only safe because all hg's files are ascii |
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787 localmodname = localmodname.encode('ascii') |
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788 for src, modname, name, line in sources(source_path, localmodname): |
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789 try: |
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790 used_imports[modname] = sorted( |
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791 imported_modules( |
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792 src, modname, name, localmods, ignore_nested=True |
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793 ) |
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794 ) |
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795 for error, lineno in verify_import_convention( |
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796 modname, src, localmods |
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797 ): |
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798 any_errors = True |
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799 print('%s:%d: %s' % (source_path, lineno + line, error)) |
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800 except SyntaxError as e: |
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801 print( |
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802 '%s:%d: SyntaxError: %s' % (source_path, e.lineno + line, e) |
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803 ) |
20036 | 804 cycles = find_cycles(used_imports) |
805 if cycles: | |
806 firstmods = set() | |
807 for c in sorted(cycles, key=_cycle_sortkey): | |
808 first = c.split()[0] | |
809 # As a rough cut, ignore any cycle that starts with the | |
810 # same module as some other cycle. Otherwise we see lots | |
811 # of cycles that are effectively duplicates. | |
812 if first in firstmods: | |
813 continue | |
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814 print('Import cycle:', c) |
20036 | 815 firstmods.add(first) |
816 any_errors = True | |
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817 return any_errors != 0 |
20036 | 818 |
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819 |
20036 | 820 if __name__ == '__main__': |
821 sys.exit(int(main(sys.argv))) |