Mercurial > hg
annotate contrib/import-checker.py @ 51319:da7ecb4deaec
delta-find: add a small docstring to deltacomputer
As we are about to introduce another object related to finding delta. So lets
have a minimal docstring to the existing one.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Fri, 22 Dec 2023 12:58:54 +0100 |
parents | 2c34c9b61a4f |
children | cf1bee12ecdb |
rev | line source |
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1 #!/usr/bin/env python3 |
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2 |
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3 |
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5 import collections |
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6 import io |
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8 import sys | |
9 | |
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10 # Import a minimal set of stdlib modules needed for list_stdlib_modules() |
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11 # to work when run from a virtualenv. The modules were chosen empirically |
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12 # so that the return value matches the return value without virtualenv. |
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13 if True: # disable lexical sorting checks |
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14 try: |
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15 import BaseHTTPServer as basehttpserver |
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16 except ImportError: |
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17 basehttpserver = None |
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18 import zlib |
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19 |
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20 import testparseutil |
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21 |
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22 # Allow list of modules that symbols can be directly imported from. |
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23 allowsymbolimports = ( |
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24 '__future__', |
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25 'breezy', |
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26 'concurrent', |
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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.jaraco.collections', |
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48 'mercurial.thirdparty.tomli', |
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49 'mercurial.thirdparty.zope', |
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50 'mercurial.thirdparty.zope.interface', |
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51 'typing', |
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52 'xml.etree.ElementTree', |
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53 ) |
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54 |
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55 # Allow list of symbols that can be directly imported. |
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56 directsymbols = ('demandimport',) |
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57 |
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58 # Modules that must be aliased because they are commonly confused with |
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59 # common variables and can create aliasing and readability issues. |
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60 requirealias = { |
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61 'ui': 'uimod', |
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62 } |
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63 |
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64 |
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65 def walklocal(root): |
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66 """Recursively yield all descendant nodes but not in a different scope""" |
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67 todo = collections.deque(ast.iter_child_nodes(root)) |
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68 yield root, False |
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69 while todo: |
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70 node = todo.popleft() |
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71 newscope = isinstance(node, ast.FunctionDef) |
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72 if not newscope: |
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73 todo.extend(ast.iter_child_nodes(node)) |
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74 yield node, newscope |
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75 |
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76 |
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77 def dotted_name_of_path(path): |
20036 | 78 """Given a relative path to a source file, return its dotted module name. |
79 | |
80 >>> dotted_name_of_path('mercurial/error.py') | |
81 'mercurial.error' | |
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82 >>> dotted_name_of_path('zlibmodule.so') |
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83 'zlib' |
20036 | 84 """ |
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85 parts = path.replace(os.sep, '/').split('/') |
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86 parts[-1] = parts[-1].split('.', 1)[0] # remove .py and .so and .ARCH.so |
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87 if parts[-1].endswith('module'): |
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88 parts[-1] = parts[-1][:-6] |
20036 | 89 return '.'.join(parts) |
90 | |
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91 |
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92 def fromlocalfunc(modulename, localmods): |
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93 """Get a function to examine which locally defined module the |
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94 target source imports via a specified name. |
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95 |
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96 `modulename` is an `dotted_name_of_path()`-ed source file path, |
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97 which may have `.__init__` at the end of it, of the target source. |
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98 |
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99 `localmods` is a set of absolute `dotted_name_of_path()`-ed source file |
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100 paths of locally defined (= Mercurial specific) modules. |
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101 |
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102 This function assumes that module names not existing in |
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103 `localmods` are from the Python standard library. |
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104 |
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105 This function returns the function, which takes `name` argument, |
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106 and returns `(absname, dottedpath, hassubmod)` tuple if `name` |
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107 matches against locally defined module. Otherwise, it returns |
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108 False. |
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109 |
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110 It is assumed that `name` doesn't have `.__init__`. |
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111 |
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112 `absname` is an absolute module name of specified `name` |
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113 (e.g. "hgext.convert"). This can be used to compose prefix for sub |
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114 modules or so. |
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115 |
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116 `dottedpath` is a `dotted_name_of_path()`-ed source file path |
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117 (e.g. "hgext.convert.__init__") of `name`. This is used to look |
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118 module up in `localmods` again. |
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119 |
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120 `hassubmod` is whether it may have sub modules under it (for |
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121 convenient, even though this is also equivalent to "absname != |
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122 dottednpath") |
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123 |
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124 >>> localmods = {'foo.__init__', 'foo.foo1', |
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125 ... 'foo.bar.__init__', 'foo.bar.bar1', |
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126 ... 'baz.__init__', 'baz.baz1'} |
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127 >>> fromlocal = fromlocalfunc('foo.xxx', localmods) |
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128 >>> # relative |
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129 >>> fromlocal('foo1') |
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130 ('foo.foo1', 'foo.foo1', False) |
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131 >>> fromlocal('bar') |
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132 ('foo.bar', 'foo.bar.__init__', True) |
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133 >>> fromlocal('bar.bar1') |
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134 ('foo.bar.bar1', 'foo.bar.bar1', False) |
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135 >>> # absolute |
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136 >>> fromlocal('baz') |
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137 ('baz', 'baz.__init__', True) |
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138 >>> fromlocal('baz.baz1') |
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139 ('baz.baz1', 'baz.baz1', False) |
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140 >>> # unknown = maybe standard library |
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141 >>> fromlocal('os') |
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142 False |
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143 >>> fromlocal(None, 1) |
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144 ('foo', 'foo.__init__', True) |
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145 >>> fromlocal('foo1', 1) |
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146 ('foo.foo1', 'foo.foo1', False) |
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147 >>> fromlocal2 = fromlocalfunc('foo.xxx.yyy', localmods) |
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148 >>> fromlocal2(None, 2) |
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149 ('foo', 'foo.__init__', True) |
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150 >>> fromlocal2('bar2', 1) |
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151 False |
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152 >>> fromlocal2('bar', 2) |
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153 ('foo.bar', 'foo.bar.__init__', True) |
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154 """ |
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155 if not isinstance(modulename, str): |
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156 modulename = modulename.decode('ascii') |
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157 prefix = '.'.join(modulename.split('.')[:-1]) |
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158 if prefix: |
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159 prefix += '.' |
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160 |
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161 def fromlocal(name, level=0): |
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162 # name is false value when relative imports are used. |
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163 if not name: |
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164 # If relative imports are used, level must not be absolute. |
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165 assert level > 0 |
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166 candidates = ['.'.join(modulename.split('.')[:-level])] |
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167 else: |
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168 if not level: |
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169 # Check relative name first. |
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170 candidates = [prefix + name, name] |
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171 else: |
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172 candidates = [ |
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173 '.'.join(modulename.split('.')[:-level]) + '.' + name |
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174 ] |
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175 |
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176 for n in candidates: |
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177 if n in localmods: |
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178 return (n, n, False) |
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179 dottedpath = n + '.__init__' |
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180 if dottedpath in localmods: |
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181 return (n, dottedpath, True) |
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182 return False |
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183 |
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184 return fromlocal |
20036 | 185 |
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186 |
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187 def populateextmods(localmods): |
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188 """Populate C extension modules based on pure modules""" |
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189 newlocalmods = set(localmods) |
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190 for n in localmods: |
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191 if n.startswith('mercurial.pure.'): |
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192 m = n[len('mercurial.pure.') :] |
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193 newlocalmods.add('mercurial.cext.' + m) |
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194 newlocalmods.add('mercurial.cffi._' + m) |
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195 return newlocalmods |
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196 |
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197 |
20036 | 198 def list_stdlib_modules(): |
199 """List the modules present in the stdlib. | |
200 | |
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201 >>> py3 = sys.version_info[0] >= 3 |
20036 | 202 >>> mods = set(list_stdlib_modules()) |
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203 >>> 'BaseHTTPServer' in mods or py3 |
20036 | 204 True |
205 | |
206 os.path isn't really a module, so it's missing: | |
207 | |
208 >>> 'os.path' in mods | |
209 False | |
210 | |
211 sys requires special treatment, because it's baked into the | |
212 interpreter, but it should still appear: | |
213 | |
214 >>> 'sys' in mods | |
215 True | |
216 | |
217 >>> 'collections' in mods | |
218 True | |
219 | |
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220 >>> 'cStringIO' in mods or py3 |
20036 | 221 True |
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222 |
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223 >>> 'cffi' in mods |
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224 True |
20036 | 225 """ |
226 for m in sys.builtin_module_names: | |
227 yield m | |
228 # These modules only exist on windows, but we should always | |
229 # consider them stdlib. | |
230 for m in ['msvcrt', '_winreg']: | |
231 yield m | |
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232 yield '__builtin__' |
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233 yield 'builtins' # python3 only |
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234 yield 'importlib.abc' # python3 only |
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235 yield 'importlib.machinery' # python3 only |
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236 yield 'importlib.util' # python3 only |
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237 yield 'packaging.version' |
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238 for m in 'fcntl', 'grp', 'pwd', 'termios': # Unix only |
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239 yield m |
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240 for m in 'cPickle', 'datetime': # in Python (not C) on PyPy |
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241 yield m |
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242 for m in ['cffi']: |
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243 yield m |
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244 stdlib_prefixes = {sys.prefix, sys.exec_prefix} |
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245 # We need to supplement the list of prefixes for the search to work |
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246 # when run from within a virtualenv. |
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247 for mod in (basehttpserver, zlib): |
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248 if mod is None: |
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249 continue |
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250 try: |
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251 # Not all module objects have a __file__ attribute. |
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252 filename = mod.__file__ |
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253 except AttributeError: |
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254 continue |
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255 dirname = os.path.dirname(filename) |
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256 for prefix in stdlib_prefixes: |
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257 if dirname.startswith(prefix): |
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258 # Then this directory is redundant. |
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259 break |
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260 else: |
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261 stdlib_prefixes.add(dirname) |
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262 sourceroot = os.path.abspath(os.path.dirname(os.path.dirname(__file__))) |
20036 | 263 for libpath in sys.path: |
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264 # We want to walk everything in sys.path that starts with something in |
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265 # stdlib_prefixes, but not directories from the hg sources. |
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266 if os.path.abspath(libpath).startswith(sourceroot) or not any( |
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267 libpath.startswith(p) for p in stdlib_prefixes |
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268 ): |
20036 | 269 continue |
270 for top, dirs, files in os.walk(libpath): | |
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271 if 'dist-packages' in top.split(os.path.sep): |
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272 continue |
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273 for i, d in reversed(list(enumerate(dirs))): |
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274 if ( |
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275 not os.path.exists(os.path.join(top, d, '__init__.py')) |
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276 or top == libpath |
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277 and d in ('hgdemandimport', 'hgext', 'mercurial') |
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278 ): |
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279 del dirs[i] |
20036 | 280 for name in files: |
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281 if not name.endswith(('.py', '.so', '.pyc', '.pyo', '.pyd')): |
20036 | 282 continue |
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283 if name.startswith('__init__.py'): |
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284 full_path = top |
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285 else: |
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286 full_path = os.path.join(top, name) |
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287 rel_path = full_path[len(libpath) + 1 :] |
20036 | 288 mod = dotted_name_of_path(rel_path) |
289 yield mod | |
290 | |
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291 |
20036 | 292 stdlib_modules = set(list_stdlib_modules()) |
293 | |
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294 |
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295 def imported_modules(source, modulename, f, localmods, ignore_nested=False): |
20036 | 296 """Given the source of a file as a string, yield the names |
297 imported by that file. | |
298 | |
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299 Args: |
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300 source: The python source to examine as a string. |
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301 modulename: of specified python source (may have `__init__`) |
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302 localmods: set of locally defined module names (may have `__init__`) |
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303 ignore_nested: If true, import statements that do not start in |
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304 column zero will be ignored. |
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305 |
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306 Returns: |
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307 A list of absolute module names imported by the given source. |
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308 |
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309 >>> f = 'foo/xxx.py' |
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310 >>> modulename = 'foo.xxx' |
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311 >>> localmods = {'foo.__init__': True, |
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312 ... 'foo.foo1': True, 'foo.foo2': True, |
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313 ... 'foo.bar.__init__': True, 'foo.bar.bar1': True, |
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314 ... 'baz.__init__': True, 'baz.baz1': True } |
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315 >>> # standard library (= not locally defined ones) |
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316 >>> sorted(imported_modules( |
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317 ... 'from stdlib1 import foo, bar; import stdlib2', |
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318 ... modulename, f, localmods)) |
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319 [] |
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320 >>> # relative importing |
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321 >>> sorted(imported_modules( |
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322 ... 'import foo1; from bar import bar1', |
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323 ... modulename, f, localmods)) |
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324 ['foo.bar.bar1', 'foo.foo1'] |
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325 >>> sorted(imported_modules( |
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326 ... 'from bar.bar1 import name1, name2, name3', |
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327 ... modulename, f, localmods)) |
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328 ['foo.bar.bar1'] |
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329 >>> # absolute importing |
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330 >>> sorted(imported_modules( |
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331 ... 'from baz import baz1, name1', |
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332 ... modulename, f, localmods)) |
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333 ['baz.__init__', 'baz.baz1'] |
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334 >>> # mixed importing, even though it shouldn't be recommended |
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335 >>> sorted(imported_modules( |
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336 ... 'import stdlib, foo1, baz', |
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337 ... modulename, f, localmods)) |
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338 ['baz.__init__', 'foo.foo1'] |
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339 >>> # ignore_nested |
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340 >>> sorted(imported_modules( |
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341 ... '''import foo |
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342 ... def wat(): |
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343 ... import bar |
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344 ... ''', modulename, f, localmods)) |
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345 ['foo.__init__', 'foo.bar.__init__'] |
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346 >>> sorted(imported_modules( |
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347 ... '''import foo |
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348 ... def wat(): |
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349 ... import bar |
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350 ... ''', modulename, f, localmods, ignore_nested=True)) |
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351 ['foo.__init__'] |
20036 | 352 """ |
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353 fromlocal = fromlocalfunc(modulename, localmods) |
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354 for node in ast.walk(ast.parse(source, f)): |
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355 if ignore_nested and getattr(node, 'col_offset', 0) > 0: |
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356 continue |
20036 | 357 if isinstance(node, ast.Import): |
358 for n in node.names: | |
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359 found = fromlocal(n.name) |
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360 if not found: |
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361 # this should import standard library |
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362 continue |
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363 yield found[1] |
20036 | 364 elif isinstance(node, ast.ImportFrom): |
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365 found = fromlocal(node.module, node.level) |
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366 if not found: |
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367 # this should import standard library |
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368 continue |
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369 |
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370 absname, dottedpath, hassubmod = found |
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371 if not hassubmod: |
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372 # "dottedpath" is not a package; must be imported |
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373 yield dottedpath |
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374 # examination of "node.names" should be redundant |
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375 # e.g.: from mercurial.node import nullid, nullrev |
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376 continue |
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377 |
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378 modnotfound = False |
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379 prefix = absname + '.' |
20036 | 380 for n in node.names: |
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381 found = fromlocal(prefix + n.name) |
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382 if not found: |
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383 # this should be a function or a property of "node.module" |
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384 modnotfound = True |
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385 continue |
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386 yield found[1] |
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387 if modnotfound and dottedpath != modulename: |
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388 # "dottedpath" is a package, but imported because of non-module |
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389 # lookup |
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390 # specifically allow "from . import foo" from __init__.py |
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391 yield dottedpath |
20036 | 392 |
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393 |
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394 def verify_import_convention(module, source, localmods): |
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395 """Verify imports match our established coding convention.""" |
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396 root = ast.parse(source) |
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397 |
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398 return verify_modern_convention(module, root, localmods) |
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399 |
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400 |
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401 def verify_modern_convention(module, root, localmods, root_col_offset=0): |
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402 """Verify a file conforms to the modern import convention rules. |
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403 |
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404 The rules of the modern convention are: |
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405 |
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406 * Ordering is stdlib followed by local imports. Each group is lexically |
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407 sorted. |
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408 * Importing multiple modules via "import X, Y" is not allowed: use |
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409 separate import statements. |
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410 * Importing multiple modules via "from X import ..." is allowed if using |
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411 parenthesis and one entry per line. |
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412 * Only 1 relative import statement per import level ("from .", "from ..") |
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413 is allowed. |
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414 * Relative imports from higher levels must occur before lower levels. e.g. |
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415 "from .." must be before "from .". |
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416 * Imports from peer packages should use relative import (e.g. do not |
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417 "import mercurial.foo" from a "mercurial.*" module). |
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418 * Symbols can only be imported from specific modules (see |
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419 `allowsymbolimports`). For other modules, first import the module then |
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420 assign the symbol to a module-level variable. In addition, these imports |
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421 must be performed before other local imports. This rule only |
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422 applies to import statements outside of any blocks. |
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423 * Relative imports from the standard library are not allowed, unless that |
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424 library is also a local module. |
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425 * Certain modules must be aliased to alternate names to avoid aliasing |
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426 and readability problems. See `requirealias`. |
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427 """ |
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428 if not isinstance(module, str): |
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429 module = module.decode('ascii') |
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430 topmodule = module.split('.')[0] |
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431 fromlocal = fromlocalfunc(module, localmods) |
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432 |
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433 # Whether a local/non-stdlib import has been performed. |
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434 seenlocal = None |
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435 # Whether a local/non-stdlib, non-symbol import has been seen. |
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436 seennonsymbollocal = False |
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437 # The last name to be imported (for sorting). |
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438 lastname = None |
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439 laststdlib = None |
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440 # Relative import levels encountered so far. |
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441 seenlevels = set() |
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442 |
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443 for node, newscope in walklocal(root): |
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444 |
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445 def msg(fmt, *args): |
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446 return (fmt % args, node.lineno) |
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447 |
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448 if newscope: |
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449 # Check for local imports in function |
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450 for r in verify_modern_convention( |
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451 module, node, localmods, node.col_offset + 4 |
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452 ): |
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453 yield r |
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454 elif isinstance(node, ast.Import): |
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455 # Disallow "import foo, bar" and require separate imports |
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456 # for each module. |
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457 if len(node.names) > 1: |
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458 yield msg( |
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459 'multiple imported names: %s', |
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460 ', '.join(n.name for n in node.names), |
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461 ) |
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462 |
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463 name = node.names[0].name |
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464 asname = node.names[0].asname |
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465 |
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466 stdlib = name in stdlib_modules |
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467 |
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468 # Ignore sorting rules on imports inside blocks. |
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469 if node.col_offset == root_col_offset: |
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470 if lastname and name < lastname and laststdlib == stdlib: |
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471 yield msg( |
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472 'imports not lexically sorted: %s < %s', name, lastname |
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473 ) |
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474 |
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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
|
475 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
|
476 laststdlib = stdlib |
25703
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import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
477 |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
478 # stdlib imports should be before local imports. |
26965
1fa66d3ad28d
import-checker: reset context to verify convention in function scope
Yuya Nishihara <yuya@tcha.org>
parents:
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|
479 if stdlib and seenlocal and node.col_offset == root_col_offset: |
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|
480 yield msg( |
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changeset
|
481 'stdlib import "%s" follows local import: %s', |
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|
482 name, |
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parents:
42813
diff
changeset
|
483 seenlocal, |
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parents:
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diff
changeset
|
484 ) |
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import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
485 |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
486 if not stdlib: |
28330
f3fb24e36d61
import-checker: report local with stdlib late warning
timeless <timeless@mozdev.org>
parents:
27621
diff
changeset
|
487 seenlocal = name |
25703
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
488 |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
489 # Import of sibling modules should use relative imports. |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
490 topname = name.split('.')[0] |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
491 if topname == topmodule: |
26955
c4114e335b49
import-checker: extract function to generate a formatted warning
Yuya Nishihara <yuya@tcha.org>
parents:
26954
diff
changeset
|
492 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
|
493 |
1a6a117d0b95
import-checker: establish modern import convention
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parents:
25702
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changeset
|
494 if name in requirealias and asname != requirealias[name]: |
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parents:
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changeset
|
495 yield msg( |
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changeset
|
496 '%s module must be "as" aliased to %s', |
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|
497 name, |
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|
498 requirealias[name], |
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|
499 ) |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
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|
500 |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
501 elif isinstance(node, ast.ImportFrom): |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
502 # Resolve the full imported module name. |
1a6a117d0b95
import-checker: establish modern import convention
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parents:
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diff
changeset
|
503 if node.level > 0: |
43075
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Augie Fackler <augie@google.com>
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|
504 fullname = '.'.join(module.split('.')[: -node.level]) |
25703
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import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
505 if node.module: |
1a6a117d0b95
import-checker: establish modern import convention
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diff
changeset
|
506 fullname += '.%s' % node.module |
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import-checker: establish modern import convention
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parents:
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diff
changeset
|
507 else: |
1a6a117d0b95
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parents:
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diff
changeset
|
508 assert node.module |
1a6a117d0b95
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parents:
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diff
changeset
|
509 fullname = node.module |
1a6a117d0b95
import-checker: establish modern import convention
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parents:
25702
diff
changeset
|
510 |
1a6a117d0b95
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
511 topname = fullname.split('.')[0] |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
512 if topname == topmodule: |
26955
c4114e335b49
import-checker: extract function to generate a formatted warning
Yuya Nishihara <yuya@tcha.org>
parents:
26954
diff
changeset
|
513 yield msg('import should be relative: %s', fullname) |
25703
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import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
514 |
1a6a117d0b95
import-checker: establish modern import convention
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parents:
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diff
changeset
|
515 # __future__ is special since it needs to come first and use |
1a6a117d0b95
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
516 # symbol import. |
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import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
517 if fullname != '__future__': |
34038
bc2535238de2
import-checker: allow relative import a module being checked
Jun Wu <quark@fb.com>
parents:
33920
diff
changeset
|
518 if not fullname or ( |
bc2535238de2
import-checker: allow relative import a module being checked
Jun Wu <quark@fb.com>
parents:
33920
diff
changeset
|
519 fullname in stdlib_modules |
43596
0ad5d6c4bfad
import-checker: allow 'from typing import ...'
Yuya Nishihara <yuya@tcha.org>
parents:
43415
diff
changeset
|
520 # 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
|
521 and fullname.startswith('.') |
34038
bc2535238de2
import-checker: allow relative import a module being checked
Jun Wu <quark@fb.com>
parents:
33920
diff
changeset
|
522 and fullname not in localmods |
43075
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parents:
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diff
changeset
|
523 and fullname + '.__init__' not in localmods |
57875cf423c9
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parents:
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diff
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|
524 ): |
26955
c4114e335b49
import-checker: extract function to generate a formatted warning
Yuya Nishihara <yuya@tcha.org>
parents:
26954
diff
changeset
|
525 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
|
526 else: |
28330
f3fb24e36d61
import-checker: report local with stdlib late warning
timeless <timeless@mozdev.org>
parents:
27621
diff
changeset
|
527 seenlocal = fullname |
25703
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
528 |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
529 # 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
|
530 # 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
|
531 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
|
532 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
|
533 prefix = found[0] + '.' |
43075
57875cf423c9
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Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
534 symbols = ( |
57875cf423c9
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Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
535 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
|
536 ) |
29207
a09098c61fea
import-checker: always build a list of imported symbols
Yuya Nishihara <yuya@tcha.org>
parents:
29122
diff
changeset
|
537 else: |
32419
d02888308235
import-checker: add a way to directly import certain symbols
Siddharth Agarwal <sid0@fb.com>
parents:
32374
diff
changeset
|
538 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
|
539 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
|
540 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
|
541 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
|
542 yield msg( |
57875cf423c9
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Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
543 '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
|
544 ', '.join(symbols), |
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
545 fullname, |
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
546 ) |
25703
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
547 |
29208
cba8bc11ed10
import-checker: extend check of symbol-import order to all local modules
Yuya Nishihara <yuya@tcha.org>
parents:
29207
diff
changeset
|
548 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
|
549 yield msg( |
57875cf423c9
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Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
550 '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
|
551 ) |
29208
cba8bc11ed10
import-checker: extend check of symbol-import order to all local modules
Yuya Nishihara <yuya@tcha.org>
parents:
29207
diff
changeset
|
552 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
|
553 seennonsymbollocal = True |
25703
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
554 |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
555 if not node.module: |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
556 assert node.level |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
557 |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
558 # 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
|
559 if ( |
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
560 node.level in seenlevels |
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
561 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
|
562 ): |
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
563 yield msg( |
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
564 '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
|
565 ) |
25703
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
566 |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
567 # 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
|
568 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
|
569 yield msg( |
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
570 '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
|
571 ) |
25703
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
572 |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
573 seenlevels.add(node.level) |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
574 |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
575 # Entries in "from .X import ( ... )" lists must be lexically |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
576 # sorted. |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
577 lastentryname = None |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
578 |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
579 for n in node.names: |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
580 if lastentryname and n.name < lastentryname: |
43075
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
581 yield msg( |
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
582 'imports from %s not lexically sorted: %s < %s', |
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
583 fullname, |
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
584 n.name, |
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
585 lastentryname, |
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
586 ) |
25703
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
587 |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
588 lastentryname = n.name |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
589 |
1a6a117d0b95
import-checker: establish modern import convention
Gregory Szorc <gregory.szorc@gmail.com>
parents:
25702
diff
changeset
|
590 if n.name in requirealias and n.asname != requirealias[n.name]: |
43075
57875cf423c9
style: run a patched black on a subset of mercurial
Augie Fackler <augie@google.com>
parents:
42813
diff
changeset
|
591 yield msg( |
57875cf423c9
style: run a patched black on a subset of mercurial
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592 '%s from %s must be "as" aliased to %s', |
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593 n.name, |
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594 fullname, |
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595 requirealias[n.name], |
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596 ) |
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597 |
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598 |
20036 | 599 class CircularImport(Exception): |
600 pass | |
601 | |
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602 |
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603 def checkmod(mod, imports): |
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604 shortest = {} |
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605 visit = [[mod]] |
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606 while visit: |
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607 path = visit.pop(0) |
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608 for i in sorted(imports.get(path[-1], [])): |
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609 if len(path) < shortest.get(i, 1000): |
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610 shortest[i] = len(path) |
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611 if i in path: |
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612 if i == path[0]: |
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613 raise CircularImport(path) |
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614 continue |
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615 visit.append(path + [i]) |
20036 | 616 |
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617 |
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618 def rotatecycle(cycle): |
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619 """arrange a cycle so that the lexicographically first module listed first |
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620 |
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621 >>> rotatecycle(['foo', 'bar']) |
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622 ['bar', 'foo', 'bar'] |
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623 """ |
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624 lowest = min(cycle) |
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625 idx = cycle.index(lowest) |
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626 return cycle[idx:] + cycle[:idx] + [lowest] |
20036 | 627 |
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628 |
20036 | 629 def find_cycles(imports): |
630 """Find cycles in an already-loaded import graph. | |
631 | |
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632 All module names recorded in `imports` should be absolute one. |
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633 |
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634 >>> imports = {'top.foo': ['top.bar', 'os.path', 'top.qux'], |
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635 ... 'top.bar': ['top.baz', 'sys'], |
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636 ... 'top.baz': ['top.foo'], |
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637 ... 'top.qux': ['top.foo']} |
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638 >>> print('\\n'.join(sorted(find_cycles(imports)))) |
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639 top.bar -> top.baz -> top.foo -> top.bar |
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640 top.foo -> top.qux -> top.foo |
20036 | 641 """ |
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642 cycles = set() |
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643 for mod in sorted(imports.keys()): |
20036 | 644 try: |
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645 checkmod(mod, imports) |
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646 except CircularImport as e: |
20036 | 647 cycle = e.args[0] |
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648 cycles.add(" -> ".join(rotatecycle(cycle))) |
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649 return cycles |
20036 | 650 |
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651 |
20036 | 652 def _cycle_sortkey(c): |
653 return len(c), c | |
654 | |
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655 |
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656 def embedded(f, modname, src): |
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657 """Extract embedded python code |
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658 |
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659 >>> def _forcestr(thing): |
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660 ... if not isinstance(thing, str): |
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661 ... return thing.decode('ascii') |
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662 ... return thing |
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663 >>> def test(fn, lines): |
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664 ... for s, m, f, l in embedded(fn, b"example", lines): |
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665 ... print("%s %s %d" % (_forcestr(m), _forcestr(f), l)) |
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666 ... print(repr(_forcestr(s))) |
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667 >>> lines = [ |
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668 ... 'comment', |
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669 ... ' >>> from __future__ import print_function', |
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670 ... " >>> ' multiline", |
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671 ... " ... string'", |
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672 ... ' ', |
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673 ... 'comment', |
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674 ... ' $ cat > foo.py <<EOF', |
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675 ... ' > from __future__ import print_function', |
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676 ... ' > EOF', |
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677 ... ] |
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678 >>> test(b"example.t", lines) |
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679 example[2] doctest.py 1 |
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680 "from __future__ import print_function\\n' multiline\\nstring'\\n\\n" |
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681 example[8] foo.py 7 |
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682 'from __future__ import print_function\\n' |
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683 """ |
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684 errors = [] |
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685 for name, starts, ends, code in testparseutil.pyembedded(f, src, errors): |
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686 if not name: |
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687 # use 'doctest.py', in order to make already existing |
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688 # doctest above pass instantly |
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689 name = 'doctest.py' |
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690 # "starts" is "line number" (1-origin), but embedded() is |
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691 # expected to return "line offset" (0-origin). Therefore, this |
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692 # yields "starts - 1". |
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693 if not isinstance(modname, str): |
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694 modname = modname.decode('utf8') |
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695 yield code, "%s[%d]" % (modname, starts), name, starts - 1 |
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696 |
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697 |
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698 def sources(f, modname): |
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699 """Yields possibly multiple sources from a filepath |
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700 |
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701 input: filepath, modulename |
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702 yields: script(string), modulename, filepath, linenumber |
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703 |
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704 For embedded scripts, the modulename and filepath will be different |
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705 from the function arguments. linenumber is an offset relative to |
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706 the input file. |
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707 """ |
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708 py = False |
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709 if not f.endswith('.t'): |
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710 with open(f, 'rb') as src: |
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711 yield src.read(), modname, f, 0 |
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712 py = True |
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713 if py or f.endswith('.t'): |
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714 # Strictly speaking we should sniff for the magic header that denotes |
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715 # Python source file encoding. But in reality we don't use anything |
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716 # other than ASCII (mainly) and UTF-8 (in a few exceptions), so |
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717 # simplicity is fine. |
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718 with io.open(f, 'r', encoding='utf-8') as src: |
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719 for script, modname, t, line in embedded(f, modname, src): |
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720 yield script, modname.encode('utf8'), t, line |
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721 |
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722 |
20036 | 723 def main(argv): |
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724 if len(argv) < 2 or (argv[1] == '-' and len(argv) > 2): |
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725 print('Usage: %s {-|file [file] [file] ...}') |
20036 | 726 return 1 |
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727 if argv[1] == '-': |
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728 argv = argv[:1] |
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729 argv.extend(l.rstrip() for l in sys.stdin.readlines()) |
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Yuya Nishihara <yuya@tcha.org>
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730 localmodpaths = {} |
20036 | 731 used_imports = {} |
732 any_errors = False | |
733 for source_path in argv[1:]: | |
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734 modname = dotted_name_of_path(source_path) |
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735 localmodpaths[modname] = source_path |
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736 localmods = populateextmods(localmodpaths) |
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737 for localmodname, source_path in sorted(localmodpaths.items()): |
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738 if not isinstance(localmodname, bytes): |
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739 # This is only safe because all hg's files are ascii |
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740 localmodname = localmodname.encode('ascii') |
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741 for src, modname, name, line in sources(source_path, localmodname): |
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742 try: |
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743 used_imports[modname] = sorted( |
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744 imported_modules( |
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745 src, modname, name, localmods, ignore_nested=True |
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746 ) |
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747 ) |
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748 for error, lineno in verify_import_convention( |
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749 modname, src, localmods |
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750 ): |
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751 any_errors = True |
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752 print('%s:%d: %s' % (source_path, lineno + line, error)) |
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753 except SyntaxError as e: |
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754 print( |
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755 '%s:%d: SyntaxError: %s' % (source_path, e.lineno + line, e) |
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756 ) |
20036 | 757 cycles = find_cycles(used_imports) |
758 if cycles: | |
759 firstmods = set() | |
760 for c in sorted(cycles, key=_cycle_sortkey): | |
761 first = c.split()[0] | |
762 # As a rough cut, ignore any cycle that starts with the | |
763 # same module as some other cycle. Otherwise we see lots | |
764 # of cycles that are effectively duplicates. | |
765 if first in firstmods: | |
766 continue | |
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767 print('Import cycle:', c) |
20036 | 768 firstmods.add(first) |
769 any_errors = True | |
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770 return any_errors != 0 |
20036 | 771 |
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772 |
20036 | 773 if __name__ == '__main__': |
774 sys.exit(int(main(sys.argv))) |