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annotate roundup/backends/indexer_dbm.py @ 6975:fe4a6ba98bfe

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flake8 - remove unused imports, unused vars, whitespace fixes
author John Rouillard <rouilj@ieee.org>
date Wed, 14 Sep 2022 15:59:59 -0400
parents 087cae2fbcea
children e605ddb45701
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 os, shutil, re, mimetypes, marshal, zlib, errno
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24 from roundup.hyperdb import Link, Multilink
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25 from roundup.backends.indexer_common import Indexer as IndexerBase
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26
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27 class Indexer(IndexerBase):
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28 '''Indexes information from roundup's hyperdb to allow efficient
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29 searching.
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30
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31 Three structures are created by the indexer::
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32
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33 files {identifier: (fileid, wordcount)}
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34 words {word: {fileid: count}}
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35 fileids {fileid: identifier}
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36
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37 where identifier is (classname, nodeid, propertyname)
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38 '''
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39 def __init__(self, db):
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40 IndexerBase.__init__(self, db)
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41 self.indexdb_path = os.path.join(db.config.DATABASE, 'indexes')
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42 self.indexdb = os.path.join(self.indexdb_path, 'index.db')
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43 self.reindex = 0
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44 self.quiet = 9
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45 self.changed = 0
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46
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47 # see if we need to reindex because of a change in code
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48 version = os.path.join(self.indexdb_path, 'version')
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49 if (not os.path.exists(self.indexdb_path) or
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50 not os.path.exists(version)):
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51 # for now the file itself is a flag
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52 self.force_reindex()
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53 elif os.path.exists(version):
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54 fd = open(version)
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55 version = fd.read()
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56 fd.close()
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57 # check the value and reindex if it's not the latest
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58 if version.strip() != '1':
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59 self.force_reindex()
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60
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61 def force_reindex(self):
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62 '''Force a reindex condition
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63 '''
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64 if os.path.exists(self.indexdb_path):
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65 shutil.rmtree(self.indexdb_path)
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66 os.makedirs(self.indexdb_path)
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67 os.chmod(self.indexdb_path, 0o775) # nosec - allow group write
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68 fd = open(os.path.join(self.indexdb_path, 'version'), 'w')
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69 fd.write('1\n')
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70 fd.close()
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71 self.reindex = 1
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72 self.changed = 1
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73
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74 def should_reindex(self):
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75 '''Should we reindex?
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76 '''
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77 return self.reindex
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78
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79 def add_text(self, identifier, text, mime_type='text/plain'):
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80 '''Add some text associated with the (classname, nodeid, property)
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81 identifier.
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82 '''
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83 # make sure the index is loaded
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84 self.load_index()
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85
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86 # remove old entries for this identifier
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87 if identifier in self.files:
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88 self.purge_entry(identifier)
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89
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90 # split into words
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91 words = self.splitter(text, mime_type)
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92
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93 # Find new file index, and assign it to identifier
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94 # (_TOP uses trick of negative to avoid conflict with file index)
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95 self.files['_TOP'] = (self.files['_TOP'][0]-1, None)
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96 file_index = abs(self.files['_TOP'][0])
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97 self.files[identifier] = (file_index, len(words))
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98 self.fileids[file_index] = identifier
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99
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100 # find the unique words
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101 filedict = {}
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102 for word in words:
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103 if self.is_stopword(word):
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104 continue
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105 if word in filedict:
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106 filedict[word] = filedict[word]+1
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107 else:
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108 filedict[word] = 1
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109
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110 # now add to the totals
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111 for word in filedict:
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112 # each word has a dict of {identifier: count}
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113 if word in self.words:
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114 entry = self.words[word]
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115 else:
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116 # new word
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117 entry = {}
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118 self.words[word] = entry
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119
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120 # make a reference to the file for this word
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121 entry[file_index] = filedict[word]
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122
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123 # save needed
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124 self.changed = 1
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125
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126 def splitter(self, text, ftype):
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127 '''Split the contents of a text string into a list of 'words'
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128 '''
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129 if ftype == 'text/plain':
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130 words = self.text_splitter(text)
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131 else:
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132 return []
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133 return words
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134
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135 def text_splitter(self, text):
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136 """Split text/plain string into a list of words
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137 """
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138 if not text:
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139 return []
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140
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141 # case insensitive
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142 text = text.upper()
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143
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144 # Split the raw text
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145 return re.findall(r'\b\w{%d,%d}\b' % (self.minlength, self.maxlength),
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146 text, re.UNICODE)
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147
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148 # we override this to ignore too short and too long words
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149 # and also to fix a bug - the (fail) case.
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150 def find(self, wordlist):
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151 '''Locate files that match ALL the words in wordlist
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152 '''
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153 if not hasattr(self, 'words'):
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154 self.load_index()
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155 self.load_index(wordlist=wordlist)
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156 entries = {}
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157 hits = None
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158 for word in wordlist:
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159 if not self.minlength <= len(word) <= self.maxlength:
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160 # word outside the bounds of what we index - ignore
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161 continue
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162 word = word.upper()
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163 if self.is_stopword(word):
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164 continue
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165 entry = self.words.get(word) # For each word, get index
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166 entries[word] = entry # of matching files
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167 if not entry: # Nothing for this one word (fail)
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168 return {}
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169 if hits is None:
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170 hits = {}
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171 for k in entry:
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172 if k not in self.fileids:
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173 raise ValueError('Index is corrupted: re-generate it')
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174 hits[k] = self.fileids[k]
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175 else:
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176 # Eliminate hits for every non-match
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177 for fileid in list(hits):
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178 if fileid not in entry:
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179 del hits[fileid]
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180 if hits is None:
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181 return {}
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182 return list(hits.values())
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183
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184 segments = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ#_-!"
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185 def load_index(self, reload=0, wordlist=None):
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186 # Unless reload is indicated, do not load twice
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187 if self.index_loaded() and not reload:
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188 return 0
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189
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190 # Ok, now let's actually load it
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191 db = {'WORDS': {}, 'FILES': {'_TOP':(0,None)}, 'FILEIDS': {}}
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192
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193 # Identify the relevant word-dictionary segments
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194 if not wordlist:
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195 segments = self.segments
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196 else:
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197 segments = ['-','#']
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198 for word in wordlist:
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199 initchar = word[0].upper()
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200 if initchar not in self.segments:
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201 initchar = '_'
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202 segments.append(initchar)
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203
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204 # Load the segments
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205 for segment in segments:
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206 try:
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207 f = open(self.indexdb + segment, 'rb')
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208 except IOError as error:
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209 # probably just nonexistent segment index file
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210 if error.errno != errno.ENOENT: raise
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211 else:
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212 pickle_str = zlib.decompress(f.read())
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213 f.close()
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214 dbslice = marshal.loads(pickle_str)
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215 if dbslice.get('WORDS'):
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216 # if it has some words, add them
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217 for word, entry in dbslice['WORDS'].items():
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218 db['WORDS'][word] = entry
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219 if dbslice.get('FILES'):
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220 # if it has some files, add them
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221 db['FILES'] = dbslice['FILES']
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222 if dbslice.get('FILEIDS'):
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223 # if it has fileids, add them
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224 db['FILEIDS'] = dbslice['FILEIDS']
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225
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226 self.words = db['WORDS']
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227 self.files = db['FILES']
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228 self.fileids = db['FILEIDS']
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229 self.changed = 0
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230
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231 def save_index(self):
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232 # only save if the index is loaded and changed
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233 if not self.index_loaded() or not self.changed:
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234 return
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235
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236 # brutal space saver... delete all the small segments
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237 for segment in self.segments:
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238 try:
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239 os.remove(self.indexdb + segment)
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240 except OSError as error:
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241 # probably just nonexistent segment index file
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242 if error.errno != errno.ENOENT: raise
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243
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244 # First write the much simpler filename/fileid dictionaries
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245 dbfil = {'WORDS':None, 'FILES':self.files, 'FILEIDS':self.fileids}
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246 open(self.indexdb+'-','wb').write(zlib.compress(marshal.dumps(dbfil)))
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247
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248 # The hard part is splitting the word dictionary up, of course
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249 letters = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ#_"
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250 segdicts = {} # Need batch of empty dicts
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251 for segment in letters:
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252 segdicts[segment] = {}
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253 for word, entry in self.words.items(): # Split into segment dicts
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254 initchar = word[0].upper()
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255 if initchar not in letters:
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256 # if it's a unicode character, add it to the '_' segment
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257 initchar = '_'
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258 segdicts[initchar][word] = entry
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259
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260 # save
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261 for initchar in letters:
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262 db = {'WORDS':segdicts[initchar], 'FILES':None, 'FILEIDS':None}
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263 pickle_str = marshal.dumps(db)
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264 filename = self.indexdb + initchar
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265 pickle_fh = open(filename, 'wb')
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266 pickle_fh.write(zlib.compress(pickle_str))
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267 pickle_fh.close()
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268 os.chmod(filename, 0o664)
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269
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270 # save done
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271 self.changed = 0
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272
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273 def purge_entry(self, identifier):
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274 '''Remove a file from file index and word index
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275 '''
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276 self.load_index()
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277
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278 if identifier not in self.files:
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279 return
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280
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281 file_index = self.files[identifier][0]
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282 del self.files[identifier]
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283 del self.fileids[file_index]
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284
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285 # The much harder part, cleanup the word index
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286 for key, occurs in self.words.items():
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287 if file_index in occurs:
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288 del occurs[file_index]
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289
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290 # save needed
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291 self.changed = 1
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292
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293 def index_loaded(self):
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294 return (hasattr(self,'fileids') and hasattr(self,'files') and
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295 hasattr(self,'words'))
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296
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297 def rollback(self):
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298 ''' load last saved index info. '''
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299 self.load_index(reload=1)
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300
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301 def close(self):
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302 pass
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303
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304
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305 # vim: set filetype=python ts=4 sw=4 et si
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