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annotate roundup/backends/indexer_dbm.py @ 7800:2d4684e4702d

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fix: enhancement to history command output and % template fix. Rather than using the key field, use the label field for descriptions. Call cls.labelprop(default_to_id=True) so it returns id rather than the first sorted property name. If labelprop() returns 'id' or 'title', we return nothing. 'id' means there is no label set and no properties named 'name' or 'title'. So have the caller do whatever it wants (prepend classname for example) when there is no human readable name. This prevents %(name)s%(key)s from producing: 23(23). Also don't accept the 'title' property. Titles can be too long. Arguably we could: '%(name)20s' to limit the title length. However without ellipses or something truncating the title might be confusing. So again pretend there is no human readable name.
author John Rouillard <rouilj@ieee.org>
date Tue, 12 Mar 2024 11:52:17 -0400
parents d17e57220a62
children
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1 #
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2 # This module is derived from the module described at:
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3 # http://gnosis.cx/publish/programming/charming_python_15.txt
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4 #
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5 # Author: David Mertz (mertz@gnosis.cx)
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6 # Thanks to: Pat Knight (p.knight@ktgroup.co.uk)
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7 # Gregory Popovitch (greg@gpy.com)
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8 #
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9 # The original module was released under this license, and remains under
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10 # it:
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11 #
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12 # This file is released to the public domain. I (dqm) would
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13 # appreciate it if you choose to keep derived works under terms
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14 # that promote freedom, but obviously am giving up any rights
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15 # to compel such.
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16 #
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17 '''This module provides an indexer class, RoundupIndexer, that stores text
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18 indices in a roundup instance. This class makes searching the content of
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19 messages, string properties and text files possible.
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20 '''
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21 __docformat__ = 'restructuredtext'
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22
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23 import errno
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24 import marshal
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25 import os
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26 import re
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27 import shutil
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28 import zlib
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29
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30 from roundup.backends.indexer_common import Indexer as IndexerBase
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31
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32
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33 class Indexer(IndexerBase):
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34 '''Indexes information from roundup's hyperdb to allow efficient
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35 searching.
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36
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37 Three structures are created by the indexer::
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38
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39 files {identifier: (fileid, wordcount)}
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40 words {word: {fileid: count}}
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41 fileids {fileid: identifier}
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42
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43 where identifier is (classname, nodeid, propertyname)
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44 '''
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45 def __init__(self, db):
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46 IndexerBase.__init__(self, db)
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47 self.indexdb_path = os.path.join(db.config.DATABASE, 'indexes')
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48 self.indexdb = os.path.join(self.indexdb_path, 'index.db')
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49 self.reindex = 0
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50 self.quiet = 9
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51 self.changed = 0
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52
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53 # see if we need to reindex because of a change in code
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54 version = os.path.join(self.indexdb_path, 'version')
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55 if (not os.path.exists(self.indexdb_path) or
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56 not os.path.exists(version)):
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57 # for now the file itself is a flag
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58 self.force_reindex()
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59 elif os.path.exists(version):
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60 fd = open(version)
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61 version = fd.read()
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62 fd.close()
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63 # check the value and reindex if it's not the latest
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64 if version.strip() != '1':
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65 self.force_reindex()
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66
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67 def force_reindex(self):
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68 '''Force a reindex condition
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69 '''
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70 if os.path.exists(self.indexdb_path):
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71 shutil.rmtree(self.indexdb_path)
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72 os.makedirs(self.indexdb_path)
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73 os.chmod(self.indexdb_path, 0o775) # nosec - allow group write
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74 fd = open(os.path.join(self.indexdb_path, 'version'), 'w')
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75 fd.write('1\n')
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76 fd.close()
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77 self.reindex = 1
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78 self.changed = 1
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79
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80 def should_reindex(self):
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81 '''Should we reindex?
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82 '''
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83 return self.reindex
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84
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85 def add_text(self, identifier, text, mime_type='text/plain'):
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86 '''Add some text associated with the (classname, nodeid, property)
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87 identifier.
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88 '''
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89 # make sure the index is loaded
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90 self.load_index()
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91
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92 # remove old entries for this identifier
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93 if identifier in self.files:
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94 self.purge_entry(identifier)
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95
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96 # split into words
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97 words = self.splitter(text, mime_type)
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98
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99 # Find new file index, and assign it to identifier
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100 # (_TOP uses trick of negative to avoid conflict with file index)
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101 self.files['_TOP'] = (self.files['_TOP'][0]-1, None)
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102 file_index = abs(self.files['_TOP'][0])
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103 self.files[identifier] = (file_index, len(words))
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104 self.fileids[file_index] = identifier
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105
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106 # find the unique words
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107 filedict = {}
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108 for word in words:
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109 if self.is_stopword(word):
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110 continue
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111 if word in filedict:
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112 filedict[word] = filedict[word]+1
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113 else:
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114 filedict[word] = 1
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115
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116 # now add to the totals
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117 for word in filedict:
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118 # each word has a dict of {identifier: count}
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119 if word in self.words:
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120 entry = self.words[word]
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121 else:
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122 # new word
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123 entry = {}
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124 self.words[word] = entry
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125
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126 # make a reference to the file for this word
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127 entry[file_index] = filedict[word]
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128
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129 # save needed
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130 self.changed = 1
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131
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132 def splitter(self, text, ftype):
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133 '''Split the contents of a text string into a list of 'words'
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134 '''
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135 if ftype == 'text/plain':
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136 words = self.text_splitter(text)
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137 else:
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138 return []
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139 return words
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140
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141 def text_splitter(self, text):
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142 """Split text/plain string into a list of words
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143 """
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144 if not text:
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145 return []
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146
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147 # case insensitive
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148 text = text.upper()
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149
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150 # Split the raw text
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151 return re.findall(r'\b\w{%d,%d}\b' % (self.minlength, self.maxlength),
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152 text, re.UNICODE)
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153
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154 # we override this to ignore too short and too long words
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155 # and also to fix a bug - the (fail) case.
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156 def find(self, wordlist):
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157 '''Locate files that match ALL the words in wordlist
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158 '''
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159 if not hasattr(self, 'words'):
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160 self.load_index()
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161 self.load_index(wordlist=wordlist)
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162 entries = {}
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163 hits = None
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164 for word in wordlist:
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165 if not self.minlength <= len(word) <= self.maxlength:
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166 # word outside the bounds of what we index - ignore
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167 continue
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168 word = word.upper()
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169 if self.is_stopword(word):
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170 continue
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171 entry = self.words.get(word) # For each word, get index
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172 entries[word] = entry # of matching files
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173 if not entry: # Nothing for this one word (fail)
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174 return {}
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175 if hits is None:
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176 hits = {}
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177 for k in entry:
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178 if k not in self.fileids:
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179 raise ValueError('Index is corrupted: re-generate it')
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180 hits[k] = self.fileids[k]
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181 else:
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182 # Eliminate hits for every non-match
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183 for fileid in list(hits):
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184 if fileid not in entry:
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185 del hits[fileid]
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186 if hits is None:
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187 return {}
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188 return list(hits.values())
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189
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190 segments = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ#_-!"
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191
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192 def load_index(self, reload=0, wordlist=None):
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193 # Unless reload is indicated, do not load twice
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194 if self.index_loaded() and not reload:
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195 return 0
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196
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197 # Ok, now let's actually load it
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198 db = {'WORDS': {}, 'FILES': {'_TOP': (0, None)}, 'FILEIDS': {}}
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199
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200 # Identify the relevant word-dictionary segments
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201 if not wordlist:
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202 segments = self.segments
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203 else:
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204 segments = ['-', '#']
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205 for word in wordlist:
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206 initchar = word[0].upper()
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207 if initchar not in self.segments:
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208 initchar = '_'
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209 segments.append(initchar)
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210
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211 # Load the segments
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212 for segment in segments:
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213 try:
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214 f = open(self.indexdb + segment, 'rb')
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215 except IOError as error:
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216 # probably just nonexistent segment index file
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217 if error.errno != errno.ENOENT: raise # noqa: E701
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218 else:
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219 pickle_str = zlib.decompress(f.read())
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220 f.close()
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221 dbslice = marshal.loads(pickle_str)
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222 if dbslice.get('WORDS'):
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223 # if it has some words, add them
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224 for word, entry in dbslice['WORDS'].items():
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225 db['WORDS'][word] = entry
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226 if dbslice.get('FILES'):
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227 # if it has some files, add them
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228 db['FILES'] = dbslice['FILES']
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229 if dbslice.get('FILEIDS'):
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230 # if it has fileids, add them
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231 db['FILEIDS'] = dbslice['FILEIDS']
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232
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233 self.words = db['WORDS']
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234 self.files = db['FILES']
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235 self.fileids = db['FILEIDS']
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236 self.changed = 0
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237
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238 def save_index(self):
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239 # only save if the index is loaded and changed
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240 if not self.index_loaded() or not self.changed:
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241 return
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242
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243 # brutal space saver... delete all the small segments
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244 for segment in self.segments:
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245 try:
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246 os.remove(self.indexdb + segment)
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247 except OSError as error:
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248 # probably just nonexistent segment index file
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249 if error.errno != errno.ENOENT: raise # noqa: E701
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250
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251 # First write the much simpler filename/fileid dictionaries
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252 dbfil = {'WORDS': None, 'FILES': self.files, 'FILEIDS': self.fileids}
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253 marshal_fh = open(self.indexdb+'-', 'wb')
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254 marshal_fh.write(zlib.compress(marshal.dumps(dbfil)))
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255 marshal_fh.close()
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256
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257 # The hard part is splitting the word dictionary up, of course
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258 letters = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ#_"
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259 segdicts = {} # Need batch of empty dicts
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260 for segment in letters:
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261 segdicts[segment] = {}
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262 for word, entry in self.words.items(): # Split into segment dicts
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263 initchar = word[0].upper()
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264 if initchar not in letters:
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265 # if it's a unicode character, add it to the '_' segment
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266 initchar = '_'
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267 segdicts[initchar][word] = entry
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268
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269 # save
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270 for initchar in letters:
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271 db = {'WORDS': segdicts[initchar], 'FILES': None, 'FILEIDS': None}
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272 pickle_str = marshal.dumps(db)
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273 filename = self.indexdb + initchar
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274 pickle_fh = open(filename, 'wb')
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275 pickle_fh.write(zlib.compress(pickle_str))
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276 pickle_fh.close()
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277 os.chmod(filename, 0o664)
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278
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279 # save done
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280 self.changed = 0
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281
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282 def purge_entry(self, identifier):
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283 '''Remove a file from file index and word index
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284 '''
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285 self.load_index()
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286
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287 if identifier not in self.files:
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288 return
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289
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290 file_index = self.files[identifier][0]
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291 del self.files[identifier]
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292 del self.fileids[file_index]
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293
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294 # The much harder part, cleanup the word index
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295 for _key, occurs in self.words.items():
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296 if file_index in occurs:
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297 del occurs[file_index]
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298
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299 # save needed
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300 self.changed = 1
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301
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302 def index_loaded(self):
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303 return (hasattr(self, 'fileids') and hasattr(self, 'files') and
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304 hasattr(self, 'words'))
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305
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306 def rollback(self):
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307 ''' load last saved index info. '''
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308 self.load_index(reload=1)
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309
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310 def close(self):
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311 pass
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312
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313
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314 # vim: set filetype=python ts=4 sw=4 et si
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