annotate mercurial/narrowspec.py @ 36729:389b950f5190

py3: use startswith() instead of slicing to detect leading whitespace
author Yuya Nishihara <yuya@tcha.org>
date Sun, 04 Mar 2018 15:24:45 -0500
parents d851951b421c
children fed6fe856333
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 # narrowspec.py - methods for working with a narrow view of a repository
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2 #
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3 # Copyright 2017 Google, Inc.
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4 #
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5 # This software may be used and distributed according to the terms of the
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6 # GNU General Public License version 2 or any later version.
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7
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8 from __future__ import absolute_import
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9
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10 import errno
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11
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12 from .i18n import _
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13 from . import (
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14 error,
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15 match as matchmod,
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16 util,
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17 )
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18
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19 FILENAME = 'narrowspec'
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20
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21 def _parsestoredpatterns(text):
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22 """Parses the narrowspec format that's stored on disk."""
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23 patlist = None
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24 includepats = []
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25 excludepats = []
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26 for l in text.splitlines():
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27 if l == '[includes]':
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28 if patlist is None:
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29 patlist = includepats
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30 else:
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31 raise error.Abort(_('narrowspec includes section must appear '
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32 'at most once, before excludes'))
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33 elif l == '[excludes]':
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34 if patlist is not excludepats:
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35 patlist = excludepats
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36 else:
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37 raise error.Abort(_('narrowspec excludes section must appear '
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38 'at most once'))
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39 else:
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40 patlist.append(l)
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41
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42 return set(includepats), set(excludepats)
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43
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44 def parseserverpatterns(text):
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45 """Parses the narrowspec format that's returned by the server."""
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46 includepats = set()
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47 excludepats = set()
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48
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49 # We get one entry per line, in the format "<key> <value>".
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50 # It's OK for value to contain other spaces.
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51 for kp in (l.split(' ', 1) for l in text.splitlines()):
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52 if len(kp) != 2:
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53 raise error.Abort(_('Invalid narrowspec pattern line: "%s"') % kp)
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54 key = kp[0]
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55 pat = kp[1]
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56 if key == 'include':
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57 includepats.add(pat)
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58 elif key == 'exclude':
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59 excludepats.add(pat)
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60 else:
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61 raise error.Abort(_('Invalid key "%s" in server response') % key)
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62
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63 return includepats, excludepats
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64
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65 def normalizesplitpattern(kind, pat):
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66 """Returns the normalized version of a pattern and kind.
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67
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68 Returns a tuple with the normalized kind and normalized pattern.
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69 """
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70 pat = pat.rstrip('/')
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71 _validatepattern(pat)
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72 return kind, pat
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73
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74 def _numlines(s):
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75 """Returns the number of lines in s, including ending empty lines."""
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76 # We use splitlines because it is Unicode-friendly and thus Python 3
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77 # compatible. However, it does not count empty lines at the end, so trick
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78 # it by adding a character at the end.
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79 return len((s + 'x').splitlines())
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80
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81 def _validatepattern(pat):
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82 """Validates the pattern and aborts if it is invalid.
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83
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84 Patterns are stored in the narrowspec as newline-separated
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85 POSIX-style bytestring paths. There's no escaping.
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86 """
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87
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88 # We use newlines as separators in the narrowspec file, so don't allow them
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89 # in patterns.
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90 if _numlines(pat) > 1:
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91 raise error.Abort(_('newlines are not allowed in narrowspec paths'))
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92
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93 components = pat.split('/')
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94 if '.' in components or '..' in components:
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95 raise error.Abort(_('"." and ".." are not allowed in narrowspec paths'))
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96
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97 def normalizepattern(pattern, defaultkind='path'):
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98 """Returns the normalized version of a text-format pattern.
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99
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100 If the pattern has no kind, the default will be added.
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101 """
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102 kind, pat = matchmod._patsplit(pattern, defaultkind)
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103 return '%s:%s' % normalizesplitpattern(kind, pat)
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104
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105 def parsepatterns(pats):
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106 """Parses a list of patterns into a typed pattern set."""
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107 return set(normalizepattern(p) for p in pats)
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108
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109 def format(includes, excludes):
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110 output = '[includes]\n'
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111 for i in sorted(includes - excludes):
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112 output += i + '\n'
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113 output += '[excludes]\n'
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114 for e in sorted(excludes):
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115 output += e + '\n'
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116 return output
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117
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118 def match(root, include=None, exclude=None):
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119 if not include:
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120 # Passing empty include and empty exclude to matchmod.match()
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121 # gives a matcher that matches everything, so explicitly use
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122 # the nevermatcher.
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123 return matchmod.never(root, '')
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124 return matchmod.match(root, '', [], include=include or [],
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125 exclude=exclude or [])
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126
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127 def needsexpansion(includes):
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128 return [i for i in includes if i.startswith('include:')]
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129
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130 def load(repo):
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131 try:
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132 spec = repo.vfs.read(FILENAME)
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133 except IOError as e:
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134 # Treat "narrowspec does not exist" the same as "narrowspec file exists
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135 # and is empty".
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136 if e.errno == errno.ENOENT:
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137 # Without this the next call to load will use the cached
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138 # non-existence of the file, which can cause some odd issues.
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139 repo.invalidate(clearfilecache=True)
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140 return set(), set()
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141 raise
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142 return _parsestoredpatterns(spec)
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143
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144 def save(repo, includepats, excludepats):
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145 spec = format(includepats, excludepats)
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146 repo.vfs.write(FILENAME, spec)
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147
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148 def restrictpatterns(req_includes, req_excludes, repo_includes, repo_excludes):
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149 r""" Restricts the patterns according to repo settings,
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150 results in a logical AND operation
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151
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152 :param req_includes: requested includes
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153 :param req_excludes: requested excludes
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154 :param repo_includes: repo includes
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155 :param repo_excludes: repo excludes
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156 :return: include patterns, exclude patterns, and invalid include patterns.
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157
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158 >>> restrictpatterns({'f1','f2'}, {}, ['f1'], [])
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159 (set(['f1']), {}, [])
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160 >>> restrictpatterns({'f1'}, {}, ['f1','f2'], [])
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161 (set(['f1']), {}, [])
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162 >>> restrictpatterns({'f1/fc1', 'f3/fc3'}, {}, ['f1','f2'], [])
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163 (set(['f1/fc1']), {}, [])
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164 >>> restrictpatterns({'f1_fc1'}, {}, ['f1','f2'], [])
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165 ([], set(['path:.']), [])
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166 >>> restrictpatterns({'f1/../f2/fc2'}, {}, ['f1','f2'], [])
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167 (set(['f2/fc2']), {}, [])
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168 >>> restrictpatterns({'f1/../f3/fc3'}, {}, ['f1','f2'], [])
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169 ([], set(['path:.']), [])
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170 >>> restrictpatterns({'f1/$non_exitent_var'}, {}, ['f1','f2'], [])
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171 (set(['f1/$non_exitent_var']), {}, [])
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172 """
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173 res_excludes = set(req_excludes)
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174 res_excludes.update(repo_excludes)
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175 invalid_includes = []
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176 if not req_includes:
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177 res_includes = set(repo_includes)
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178 elif 'path:.' not in repo_includes:
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179 res_includes = []
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180 for req_include in req_includes:
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181 req_include = util.expandpath(util.normpath(req_include))
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182 if req_include in repo_includes:
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183 res_includes.append(req_include)
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184 continue
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185 valid = False
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186 for repo_include in repo_includes:
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187 if req_include.startswith(repo_include + '/'):
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188 valid = True
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189 res_includes.append(req_include)
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190 break
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191 if not valid:
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192 invalid_includes.append(req_include)
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193 if len(res_includes) == 0:
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194 res_excludes = {'path:.'}
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195 else:
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196 res_includes = set(res_includes)
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197 else:
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198 res_includes = set(req_includes)
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199 return res_includes, res_excludes, invalid_includes