Mercurial > hg
annotate contrib/import-checker.py @ 26362:3bfc473f4d33
gitweb, monoblue: fix vertical align of spans in .sourcelines
Empty lines in file view could produce an inexplicable margin before the next
line (most noticeable in browsers on webkit/blink engine). That was making
empty lines seem taller than the rest.
Instead of using default vertical align, let's set it to 'top'.
This issue is actually present in paper, and only recently got into gitweb
(2239626369f5) and monoblue (119202d4d7a4). There's a bit more to it in paper,
so that will be dealt with in a future patch.
Recipe to see live: preferably using a webkit/blink browser, such as chromium,
browse a file with empty lines, e.g. https://selenic.com/hg/file/3.5/README#l8
Selecting a block of text that includes empty lines will reveal white "breaks"
in the selection. Highlighted line (#l8) also shows such a break below itself.
author | Anton Shestakov <av6@dwimlabs.net> |
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date | Fri, 25 Sep 2015 03:02:38 +0800 |
parents | ae65b1b4cb46 |
children | 1aee2ab0f902 |
rev | line source |
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20036 | 1 import ast |
2 import os | |
3 import sys | |
4 | |
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5 # Import a minimal set of stdlib modules needed for list_stdlib_modules() |
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6 # to work when run from a virtualenv. The modules were chosen empirically |
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7 # so that the return value matches the return value without virtualenv. |
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8 import BaseHTTPServer |
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9 import zlib |
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10 |
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11 # Whitelist of modules that symbols can be directly imported from. |
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12 allowsymbolimports = ( |
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13 '__future__', |
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14 'mercurial.i18n', |
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15 'mercurial.node', |
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16 ) |
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17 |
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18 # Modules that must be aliased because they are commonly confused with |
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19 # common variables and can create aliasing and readability issues. |
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20 requirealias = { |
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21 'ui': 'uimod', |
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22 } |
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23 |
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24 def usingabsolute(root): |
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25 """Whether absolute imports are being used.""" |
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26 if sys.version_info[0] >= 3: |
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27 return True |
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28 |
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29 for node in ast.walk(root): |
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30 if isinstance(node, ast.ImportFrom): |
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31 if node.module == '__future__': |
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32 for n in node.names: |
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33 if n.name == 'absolute_import': |
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34 return True |
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35 |
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36 return False |
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37 |
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38 def dotted_name_of_path(path, trimpure=False): |
20036 | 39 """Given a relative path to a source file, return its dotted module name. |
40 | |
41 >>> dotted_name_of_path('mercurial/error.py') | |
42 'mercurial.error' | |
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43 >>> dotted_name_of_path('mercurial/pure/parsers.py', trimpure=True) |
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44 'mercurial.parsers' |
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45 >>> dotted_name_of_path('zlibmodule.so') |
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46 'zlib' |
20036 | 47 """ |
48 parts = path.split('/') | |
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49 parts[-1] = parts[-1].split('.', 1)[0] # remove .py and .so and .ARCH.so |
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50 if parts[-1].endswith('module'): |
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51 parts[-1] = parts[-1][:-6] |
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52 if trimpure: |
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53 return '.'.join(p for p in parts if p != 'pure') |
20036 | 54 return '.'.join(parts) |
55 | |
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56 def fromlocalfunc(modulename, localmods): |
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57 """Get a function to examine which locally defined module the |
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58 target source imports via a specified name. |
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59 |
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60 `modulename` is an `dotted_name_of_path()`-ed source file path, |
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61 which may have `.__init__` at the end of it, of the target source. |
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62 |
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63 `localmods` is a dict (or set), of which key is an absolute |
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64 `dotted_name_of_path()`-ed source file path of locally defined (= |
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65 Mercurial specific) modules. |
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66 |
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67 This function assumes that module names not existing in |
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68 `localmods` are ones of Python standard libarary. |
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69 |
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70 This function returns the function, which takes `name` argument, |
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71 and returns `(absname, dottedpath, hassubmod)` tuple if `name` |
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72 matches against locally defined module. Otherwise, it returns |
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73 False. |
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74 |
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75 It is assumed that `name` doesn't have `.__init__`. |
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76 |
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77 `absname` is an absolute module name of specified `name` |
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78 (e.g. "hgext.convert"). This can be used to compose prefix for sub |
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79 modules or so. |
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80 |
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81 `dottedpath` is a `dotted_name_of_path()`-ed source file path |
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82 (e.g. "hgext.convert.__init__") of `name`. This is used to look |
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83 module up in `localmods` again. |
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84 |
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85 `hassubmod` is whether it may have sub modules under it (for |
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86 convenient, even though this is also equivalent to "absname != |
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87 dottednpath") |
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88 |
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89 >>> localmods = {'foo.__init__': True, 'foo.foo1': True, |
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90 ... 'foo.bar.__init__': True, 'foo.bar.bar1': True, |
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91 ... 'baz.__init__': True, 'baz.baz1': True } |
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92 >>> fromlocal = fromlocalfunc('foo.xxx', localmods) |
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93 >>> # relative |
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94 >>> fromlocal('foo1') |
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95 ('foo.foo1', 'foo.foo1', False) |
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96 >>> fromlocal('bar') |
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97 ('foo.bar', 'foo.bar.__init__', True) |
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98 >>> fromlocal('bar.bar1') |
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99 ('foo.bar.bar1', 'foo.bar.bar1', False) |
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100 >>> # absolute |
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101 >>> fromlocal('baz') |
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102 ('baz', 'baz.__init__', True) |
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103 >>> fromlocal('baz.baz1') |
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104 ('baz.baz1', 'baz.baz1', False) |
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105 >>> # unknown = maybe standard library |
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106 >>> fromlocal('os') |
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107 False |
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108 >>> fromlocal(None, 1) |
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109 ('foo', 'foo.__init__', True) |
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110 >>> fromlocal2 = fromlocalfunc('foo.xxx.yyy', localmods) |
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111 >>> fromlocal2(None, 2) |
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112 ('foo', 'foo.__init__', True) |
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113 """ |
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114 prefix = '.'.join(modulename.split('.')[:-1]) |
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115 if prefix: |
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116 prefix += '.' |
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117 def fromlocal(name, level=0): |
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118 # name is None when relative imports are used. |
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119 if name is None: |
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120 # If relative imports are used, level must not be absolute. |
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121 assert level > 0 |
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122 candidates = ['.'.join(modulename.split('.')[:-level])] |
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123 else: |
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124 # Check relative name first. |
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125 candidates = [prefix + name, name] |
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126 |
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127 for n in candidates: |
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128 if n in localmods: |
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129 return (n, n, False) |
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130 dottedpath = n + '.__init__' |
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131 if dottedpath in localmods: |
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132 return (n, dottedpath, True) |
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133 return False |
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134 return fromlocal |
20036 | 135 |
136 def list_stdlib_modules(): | |
137 """List the modules present in the stdlib. | |
138 | |
139 >>> mods = set(list_stdlib_modules()) | |
140 >>> 'BaseHTTPServer' in mods | |
141 True | |
142 | |
143 os.path isn't really a module, so it's missing: | |
144 | |
145 >>> 'os.path' in mods | |
146 False | |
147 | |
148 sys requires special treatment, because it's baked into the | |
149 interpreter, but it should still appear: | |
150 | |
151 >>> 'sys' in mods | |
152 True | |
153 | |
154 >>> 'collections' in mods | |
155 True | |
156 | |
157 >>> 'cStringIO' in mods | |
158 True | |
159 """ | |
160 for m in sys.builtin_module_names: | |
161 yield m | |
162 # These modules only exist on windows, but we should always | |
163 # consider them stdlib. | |
164 for m in ['msvcrt', '_winreg']: | |
165 yield m | |
166 # These get missed too | |
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167 for m in 'ctypes', 'email', 'multiprocessing': |
20036 | 168 yield m |
169 yield 'builtins' # python3 only | |
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170 for m in 'fcntl', 'grp', 'pwd', 'termios': # Unix only |
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171 yield m |
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172 stdlib_prefixes = set([sys.prefix, sys.exec_prefix]) |
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173 # We need to supplement the list of prefixes for the search to work |
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174 # when run from within a virtualenv. |
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175 for mod in (BaseHTTPServer, zlib): |
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176 try: |
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177 # Not all module objects have a __file__ attribute. |
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178 filename = mod.__file__ |
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179 except AttributeError: |
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180 continue |
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181 dirname = os.path.dirname(filename) |
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182 for prefix in stdlib_prefixes: |
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183 if dirname.startswith(prefix): |
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184 # Then this directory is redundant. |
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185 break |
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186 else: |
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187 stdlib_prefixes.add(dirname) |
20036 | 188 for libpath in sys.path: |
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189 # We want to walk everything in sys.path that starts with |
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190 # something in stdlib_prefixes. check-code suppressed because |
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191 # the ast module used by this script implies the availability |
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192 # of any(). |
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193 if not any(libpath.startswith(p) for p in stdlib_prefixes): # no-py24 |
20036 | 194 continue |
195 for top, dirs, files in os.walk(libpath): | |
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196 for i, d in reversed(list(enumerate(dirs))): |
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197 if (not os.path.exists(os.path.join(top, d, '__init__.py')) |
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198 or top == libpath and d in ('hgext', 'mercurial')): |
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199 del dirs[i] |
20036 | 200 for name in files: |
201 if name == '__init__.py': | |
202 continue | |
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203 if not name.endswith(('.py', '.so', '.pyc', '.pyo', '.pyd')): |
20036 | 204 continue |
205 full_path = os.path.join(top, name) | |
206 rel_path = full_path[len(libpath) + 1:] | |
207 mod = dotted_name_of_path(rel_path) | |
208 yield mod | |
209 | |
210 stdlib_modules = set(list_stdlib_modules()) | |
211 | |
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212 def imported_modules(source, modulename, localmods, ignore_nested=False): |
20036 | 213 """Given the source of a file as a string, yield the names |
214 imported by that file. | |
215 | |
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216 Args: |
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217 source: The python source to examine as a string. |
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218 modulename: of specified python source (may have `__init__`) |
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219 localmods: dict of locally defined module names (may have `__init__`) |
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220 ignore_nested: If true, import statements that do not start in |
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221 column zero will be ignored. |
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222 |
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223 Returns: |
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224 A list of absolute module names imported by the given source. |
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225 |
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226 >>> modulename = 'foo.xxx' |
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227 >>> localmods = {'foo.__init__': True, |
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228 ... 'foo.foo1': True, 'foo.foo2': True, |
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229 ... 'foo.bar.__init__': True, 'foo.bar.bar1': True, |
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230 ... 'baz.__init__': True, 'baz.baz1': True } |
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231 >>> # standard library (= not locally defined ones) |
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232 >>> sorted(imported_modules( |
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233 ... 'from stdlib1 import foo, bar; import stdlib2', |
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234 ... modulename, localmods)) |
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235 [] |
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236 >>> # relative importing |
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237 >>> sorted(imported_modules( |
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238 ... 'import foo1; from bar import bar1', |
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239 ... modulename, localmods)) |
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240 ['foo.bar.__init__', 'foo.bar.bar1', 'foo.foo1'] |
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241 >>> sorted(imported_modules( |
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242 ... 'from bar.bar1 import name1, name2, name3', |
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243 ... modulename, localmods)) |
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244 ['foo.bar.bar1'] |
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245 >>> # absolute importing |
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246 >>> sorted(imported_modules( |
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247 ... 'from baz import baz1, name1', |
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248 ... modulename, localmods)) |
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249 ['baz.__init__', 'baz.baz1'] |
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250 >>> # mixed importing, even though it shouldn't be recommended |
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251 >>> sorted(imported_modules( |
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252 ... 'import stdlib, foo1, baz', |
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253 ... modulename, localmods)) |
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254 ['baz.__init__', 'foo.foo1'] |
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255 >>> # ignore_nested |
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256 >>> sorted(imported_modules( |
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257 ... '''import foo |
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258 ... def wat(): |
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259 ... import bar |
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260 ... ''', modulename, localmods)) |
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261 ['foo.__init__', 'foo.bar.__init__'] |
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262 >>> sorted(imported_modules( |
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263 ... '''import foo |
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264 ... def wat(): |
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265 ... import bar |
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266 ... ''', modulename, localmods, ignore_nested=True)) |
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267 ['foo.__init__'] |
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269 fromlocal = fromlocalfunc(modulename, localmods) |
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271 if ignore_nested and getattr(node, 'col_offset', 0) > 0: |
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272 continue |
20036 | 273 if isinstance(node, ast.Import): |
274 for n in node.names: | |
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275 found = fromlocal(n.name) |
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276 if not found: |
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277 # this should import standard library |
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278 continue |
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279 yield found[1] |
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281 found = fromlocal(node.module, node.level) |
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282 if not found: |
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283 # this should import standard library |
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284 continue |
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285 |
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286 absname, dottedpath, hassubmod = found |
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287 yield dottedpath |
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288 if not hassubmod: |
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289 # examination of "node.names" should be redundant |
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290 # e.g.: from mercurial.node import nullid, nullrev |
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291 continue |
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292 |
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293 prefix = absname + '.' |
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295 found = fromlocal(prefix + n.name) |
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296 if not found: |
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297 # this should be a function or a property of "node.module" |
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298 continue |
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299 yield found[1] |
20036 | 300 |
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301 def verify_import_convention(module, source): |
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302 """Verify imports match our established coding convention. |
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303 |
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304 We have 2 conventions: legacy and modern. The modern convention is in |
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305 effect when using absolute imports. |
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306 |
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307 The legacy convention only looks for mixed imports. The modern convention |
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308 is much more thorough. |
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309 """ |
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310 root = ast.parse(source) |
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311 absolute = usingabsolute(root) |
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312 |
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313 if absolute: |
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314 return verify_modern_convention(module, root) |
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315 else: |
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316 return verify_stdlib_on_own_line(root) |
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317 |
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318 def verify_modern_convention(module, root): |
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319 """Verify a file conforms to the modern import convention rules. |
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320 |
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321 The rules of the modern convention are: |
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322 |
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323 * Ordering is stdlib followed by local imports. Each group is lexically |
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324 sorted. |
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325 * Importing multiple modules via "import X, Y" is not allowed: use |
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326 separate import statements. |
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327 * Importing multiple modules via "from X import ..." is allowed if using |
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328 parenthesis and one entry per line. |
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329 * Only 1 relative import statement per import level ("from .", "from ..") |
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330 is allowed. |
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331 * Relative imports from higher levels must occur before lower levels. e.g. |
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332 "from .." must be before "from .". |
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333 * Imports from peer packages should use relative import (e.g. do not |
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334 "import mercurial.foo" from a "mercurial.*" module). |
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335 * Symbols can only be imported from specific modules (see |
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336 `allowsymbolimports`). For other modules, first import the module then |
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337 assign the symbol to a module-level variable. In addition, these imports |
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338 must be performed before other relative imports. This rule only |
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339 applies to import statements outside of any blocks. |
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340 * Relative imports from the standard library are not allowed. |
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341 * Certain modules must be aliased to alternate names to avoid aliasing |
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342 and readability problems. See `requirealias`. |
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343 """ |
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344 topmodule = module.split('.')[0] |
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345 |
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346 # Whether a local/non-stdlib import has been performed. |
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347 seenlocal = False |
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348 # Whether a relative, non-symbol import has been seen. |
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349 seennonsymbolrelative = False |
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350 # The last name to be imported (for sorting). |
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351 lastname = None |
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352 # Relative import levels encountered so far. |
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353 seenlevels = set() |
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354 |
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355 for node in ast.walk(root): |
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356 if isinstance(node, ast.Import): |
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357 # Disallow "import foo, bar" and require separate imports |
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358 # for each module. |
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359 if len(node.names) > 1: |
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360 yield 'multiple imported names: %s' % ', '.join( |
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361 n.name for n in node.names) |
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362 |
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363 name = node.names[0].name |
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364 asname = node.names[0].asname |
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365 |
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366 # Ignore sorting rules on imports inside blocks. |
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367 if node.col_offset == 0: |
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368 if lastname and name < lastname: |
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369 yield 'imports not lexically sorted: %s < %s' % ( |
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370 name, lastname) |
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371 |
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372 lastname = name |
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373 |
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374 # stdlib imports should be before local imports. |
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375 stdlib = name in stdlib_modules |
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376 if stdlib and seenlocal and node.col_offset == 0: |
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377 yield 'stdlib import follows local import: %s' % name |
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378 |
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379 if not stdlib: |
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380 seenlocal = True |
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381 |
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382 # Import of sibling modules should use relative imports. |
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383 topname = name.split('.')[0] |
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384 if topname == topmodule: |
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385 yield 'import should be relative: %s' % name |
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386 |
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387 if name in requirealias and asname != requirealias[name]: |
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388 yield '%s module must be "as" aliased to %s' % ( |
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389 name, requirealias[name]) |
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390 |
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391 elif isinstance(node, ast.ImportFrom): |
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392 # Resolve the full imported module name. |
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393 if node.level > 0: |
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394 fullname = '.'.join(module.split('.')[:-node.level]) |
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395 if node.module: |
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396 fullname += '.%s' % node.module |
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397 else: |
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398 assert node.module |
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399 fullname = node.module |
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400 |
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401 topname = fullname.split('.')[0] |
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402 if topname == topmodule: |
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403 yield 'import should be relative: %s' % fullname |
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404 |
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405 # __future__ is special since it needs to come first and use |
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406 # symbol import. |
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407 if fullname != '__future__': |
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408 if not fullname or fullname in stdlib_modules: |
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409 yield 'relative import of stdlib module' |
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410 else: |
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411 seenlocal = True |
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412 |
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413 # Direct symbol import is only allowed from certain modules and |
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414 # must occur before non-symbol imports. |
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415 if node.module and node.col_offset == 0: |
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416 if fullname not in allowsymbolimports: |
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417 yield 'direct symbol import from %s' % fullname |
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418 |
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419 if seennonsymbolrelative: |
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420 yield ('symbol import follows non-symbol import: %s' % |
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421 fullname) |
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422 |
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423 if not node.module: |
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424 assert node.level |
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425 seennonsymbolrelative = True |
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426 |
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427 # Only allow 1 group per level. |
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428 if node.level in seenlevels and node.col_offset == 0: |
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429 yield 'multiple "from %s import" statements' % ( |
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430 '.' * node.level) |
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431 |
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432 # Higher-level groups come before lower-level groups. |
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433 if any(node.level > l for l in seenlevels): |
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434 yield 'higher-level import should come first: %s' % ( |
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435 fullname) |
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436 |
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437 seenlevels.add(node.level) |
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438 |
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439 # Entries in "from .X import ( ... )" lists must be lexically |
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440 # sorted. |
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441 lastentryname = None |
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442 |
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443 for n in node.names: |
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444 if lastentryname and n.name < lastentryname: |
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445 yield 'imports from %s not lexically sorted: %s < %s' % ( |
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446 fullname, n.name, lastentryname) |
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447 |
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448 lastentryname = n.name |
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449 |
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450 if n.name in requirealias and n.asname != requirealias[n.name]: |
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451 yield '%s from %s must be "as" aliased to %s' % ( |
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452 n.name, fullname, requirealias[n.name]) |
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453 |
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454 def verify_stdlib_on_own_line(root): |
20036 | 455 """Given some python source, verify that stdlib imports are done |
456 in separate statements from relative local module imports. | |
457 | |
458 Observing this limitation is important as it works around an | |
459 annoying lib2to3 bug in relative import rewrites: | |
460 http://bugs.python.org/issue19510. | |
461 | |
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462 >>> list(verify_stdlib_on_own_line(ast.parse('import sys, foo'))) |
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463 ['mixed imports\\n stdlib: sys\\n relative: foo'] |
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464 >>> list(verify_stdlib_on_own_line(ast.parse('import sys, os'))) |
20036 | 465 [] |
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466 >>> list(verify_stdlib_on_own_line(ast.parse('import foo, bar'))) |
20036 | 467 [] |
468 """ | |
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469 for node in ast.walk(root): |
20036 | 470 if isinstance(node, ast.Import): |
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471 from_stdlib = {False: [], True: []} |
20036 | 472 for n in node.names: |
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473 from_stdlib[n.name in stdlib_modules].append(n.name) |
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474 if from_stdlib[True] and from_stdlib[False]: |
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475 yield ('mixed imports\n stdlib: %s\n relative: %s' % |
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476 (', '.join(sorted(from_stdlib[True])), |
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477 ', '.join(sorted(from_stdlib[False])))) |
20036 | 478 |
479 class CircularImport(Exception): | |
480 pass | |
481 | |
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482 def checkmod(mod, imports): |
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483 shortest = {} |
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484 visit = [[mod]] |
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485 while visit: |
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486 path = visit.pop(0) |
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487 for i in sorted(imports.get(path[-1], [])): |
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488 if len(path) < shortest.get(i, 1000): |
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489 shortest[i] = len(path) |
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490 if i in path: |
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491 if i == path[0]: |
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492 raise CircularImport(path) |
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493 continue |
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494 visit.append(path + [i]) |
20036 | 495 |
20038
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496 def rotatecycle(cycle): |
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497 """arrange a cycle so that the lexicographically first module listed first |
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498 |
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499 >>> rotatecycle(['foo', 'bar']) |
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500 ['bar', 'foo', 'bar'] |
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501 """ |
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502 lowest = min(cycle) |
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503 idx = cycle.index(lowest) |
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504 return cycle[idx:] + cycle[:idx] + [lowest] |
20036 | 505 |
506 def find_cycles(imports): | |
507 """Find cycles in an already-loaded import graph. | |
508 | |
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509 All module names recorded in `imports` should be absolute one. |
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510 |
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511 >>> imports = {'top.foo': ['top.bar', 'os.path', 'top.qux'], |
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512 ... 'top.bar': ['top.baz', 'sys'], |
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513 ... 'top.baz': ['top.foo'], |
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514 ... 'top.qux': ['top.foo']} |
20036 | 515 >>> print '\\n'.join(sorted(find_cycles(imports))) |
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516 top.bar -> top.baz -> top.foo -> top.bar |
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517 top.foo -> top.qux -> top.foo |
20036 | 518 """ |
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519 cycles = set() |
20036 | 520 for mod in sorted(imports.iterkeys()): |
521 try: | |
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522 checkmod(mod, imports) |
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523 except CircularImport as e: |
20036 | 524 cycle = e.args[0] |
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525 cycles.add(" -> ".join(rotatecycle(cycle))) |
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526 return cycles |
20036 | 527 |
528 def _cycle_sortkey(c): | |
529 return len(c), c | |
530 | |
531 def main(argv): | |
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532 if len(argv) < 2 or (argv[1] == '-' and len(argv) > 2): |
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533 print 'Usage: %s {-|file [file] [file] ...}' |
20036 | 534 return 1 |
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535 if argv[1] == '-': |
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536 argv = argv[:1] |
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537 argv.extend(l.rstrip() for l in sys.stdin.readlines()) |
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538 localmods = {} |
20036 | 539 used_imports = {} |
540 any_errors = False | |
541 for source_path in argv[1:]: | |
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542 modname = dotted_name_of_path(source_path, trimpure=True) |
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543 localmods[modname] = source_path |
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544 for modname, source_path in sorted(localmods.iteritems()): |
20036 | 545 f = open(source_path) |
546 src = f.read() | |
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547 used_imports[modname] = sorted( |
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548 imported_modules(src, modname, localmods, ignore_nested=True)) |
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549 for error in verify_import_convention(modname, src): |
20036 | 550 any_errors = True |
551 print source_path, error | |
552 f.close() | |
553 cycles = find_cycles(used_imports) | |
554 if cycles: | |
555 firstmods = set() | |
556 for c in sorted(cycles, key=_cycle_sortkey): | |
557 first = c.split()[0] | |
558 # As a rough cut, ignore any cycle that starts with the | |
559 # same module as some other cycle. Otherwise we see lots | |
560 # of cycles that are effectively duplicates. | |
561 if first in firstmods: | |
562 continue | |
563 print 'Import cycle:', c | |
564 firstmods.add(first) | |
565 any_errors = True | |
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566 return any_errors != 0 |
20036 | 567 |
568 if __name__ == '__main__': | |
569 sys.exit(int(main(sys.argv))) |