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annotate roundup/backends/indexer_common.py @ 6353:9d209d2b34ae

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Add indexer_language to change stemmer for xapian FTS indexer Nagy Gabor asked how to enable the hungarian stemmer in roundup. This required editing indexer_xapian.py replacing hardcoded "english" term. This value is now exposed in the config file under [main] index_language. This only works for xapian currently.
author John Rouillard <rouilj@ieee.org>
date Sun, 28 Mar 2021 23:34:43 -0400
parents 23b8e6067f7c
children 91ab3e0ffcd0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 import re
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2
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3 from roundup import hyperdb
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4
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5 STOPWORDS = [
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6 "A", "AND", "ARE", "AS", "AT", "BE", "BUT", "BY",
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7 "FOR", "IF", "IN", "INTO", "IS", "IT",
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8 "NO", "NOT", "OF", "ON", "OR", "SUCH",
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9 "THAT", "THE", "THEIR", "THEN", "THERE", "THESE",
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10 "THEY", "THIS", "TO", "WAS", "WILL", "WITH"
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11 ]
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12
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13 def _isLink(propclass):
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14 return (isinstance(propclass, hyperdb.Link) or
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15 isinstance(propclass, hyperdb.Multilink))
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16
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17 class Indexer:
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18 def __init__(self, db):
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19 self.stopwords = set(STOPWORDS)
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20 for word in db.config[('main', 'indexer_stopwords')]:
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21 self.stopwords.add(word)
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22 # Do not index anything longer than 25 characters since that'll be
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23 # gibberish (encoded text or somesuch) or shorter than 2 characters
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24 self.minlength = 2
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25 self.maxlength = 25
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26 self.language = db.config[('main','indexer_language')]
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27
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28 def is_stopword(self, word):
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29 return word in self.stopwords
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30
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31 def getHits(self, search_terms, klass):
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32 return self.find(search_terms)
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33
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34 def search(self, search_terms, klass, ignore={}):
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35 """Display search results looking for [search, terms] associated
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36 with the hyperdb Class "klass". Ignore hits on {class: property}.
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37 """
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38 # do the index lookup
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39 hits = self.getHits(search_terms, klass)
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40 if not hits:
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41 return {}
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42
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43 designator_propname = {}
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44 for nm, propclass in klass.getprops().items():
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45 if _isLink(propclass):
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46 designator_propname.setdefault(propclass.classname,
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47 []).append(nm)
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48
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49 # build a dictionary of nodes and their associated messages
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50 # and files
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51 nodeids = {} # this is the answer
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52 propspec = {} # used to do the klass.find
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53 for l in designator_propname.values():
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54 for propname in l:
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55 propspec[propname] = {} # used as a set (value doesn't matter)
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56
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57 # don't unpack hits entries as sqlite3's Row can't be unpacked :(
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58 for entry in hits:
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59 # skip this result if we don't care about this class/property
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60 classname = entry[0]
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61 property = entry[2]
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62 if (classname, property) in ignore:
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63 continue
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64
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65 # if it's a property on klass, it's easy
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66 # (make sure the nodeid is str() not unicode() as returned by some
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67 # backends as that can cause problems down the track)
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68 nodeid = str(entry[1])
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69 if classname == klass.classname:
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70 if nodeid not in nodeids:
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71 nodeids[nodeid] = {}
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72 continue
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73
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74 # make sure the class is a linked one, otherwise ignore
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75 if classname not in designator_propname:
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76 continue
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77
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78 # it's a linked class - set up to do the klass.find
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79 for linkprop in designator_propname[classname]:
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80 propspec[linkprop][nodeid] = 1
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81
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82 # retain only the meaningful entries
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83 for propname, idset in list(propspec.items()):
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84 if not idset:
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85 del propspec[propname]
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86
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87 # klass.find tells me the klass nodeids the linked nodes relate to
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88 propdefs = klass.getprops()
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89 for resid in klass.find(**propspec):
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90 resid = str(resid)
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91 if resid in nodeids:
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92 continue # we ignore duplicate resids
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93 nodeids[resid] = {}
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94 node_dict = nodeids[resid]
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95 # now figure out where it came from
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96 for linkprop in propspec:
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97 v = klass.get(resid, linkprop)
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98 # the link might be a Link so deal with a single result or None
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99 if isinstance(propdefs[linkprop], hyperdb.Link):
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100 if v is None: continue
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101 v = [v]
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102 for nodeid in v:
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103 if nodeid in propspec[linkprop]:
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104 # OK, this node[propname] has a winner
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105 if linkprop not in node_dict:
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106 node_dict[linkprop] = [nodeid]
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107 else:
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108 node_dict[linkprop].append(nodeid)
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109 return nodeids
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110
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111 def get_indexer(config, db):
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112 indexer_name = getattr(config, "INDEXER", "")
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113 if not indexer_name:
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114 # Try everything
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115 try:
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116 from .indexer_xapian import Indexer
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117 return Indexer(db)
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118 except ImportError:
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119 pass
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120
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121 try:
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122 from .indexer_whoosh import Indexer
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123 return Indexer(db)
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124 except ImportError:
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125 pass
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126
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127 indexer_name = "native" # fallback to native full text search
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128
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129 if indexer_name == "xapian":
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130 from .indexer_xapian import Indexer
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131 return Indexer(db)
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132
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133 if indexer_name == "whoosh":
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134 from .indexer_whoosh import Indexer
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135 return Indexer(db)
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136
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137 if indexer_name == "native":
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138 # load proper native indexing based on database type
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139 if db.dbtype == "anydbm":
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140 from roundup.backends.indexer_dbm import Indexer
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141 return Indexer(db)
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142
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143 if db.dbtype in ("sqlite", "postgres", "mysql"):
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144 from roundup.backends.indexer_rdbms import Indexer
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145 return Indexer(db)
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146
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147 raise AssertionError("Invalid indexer: %r" %(indexer_name))
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148
Roundup Issue Tracker: http://roundup-tracker.org/