Mercurial > repos > guerler > springsuite
annotate planemo/lib/python3.7/site-packages/rdflib/plugins/stores/regexmatching.py @ 1:56ad4e20f292 draft
"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author | guerler |
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date | Fri, 31 Jul 2020 00:32:28 -0400 |
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1 """ |
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2 This wrapper intercepts calls through the store interface which make use of |
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3 the REGEXTerm class to represent matches by REGEX instead of literal |
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4 comparison. |
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5 |
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6 Implemented for stores that don't support this and essentially |
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7 provides the support by replacing the REGEXTerms by wildcards (None) and |
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8 matching against the results from the store it's wrapping. |
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9 """ |
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10 |
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11 from rdflib.store import Store |
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12 from rdflib.graph import Graph |
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13 import re |
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14 |
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15 # Store is capable of doing its own REGEX matching |
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16 NATIVE_REGEX = 0 |
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17 # Store uses Python's re module internally for REGEX matching |
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18 PYTHON_REGEX = 1 |
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19 |
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20 |
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21 class REGEXTerm(str): |
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22 """ |
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23 REGEXTerm can be used in any term slot and is interpreted as a request to |
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24 perform a REGEX match (not a string comparison) using the value |
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25 (pre-compiled) for checking rdf:type matches |
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26 """ |
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27 def __init__(self, expr): |
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28 self.compiledExpr = re.compile(expr) |
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29 |
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30 def __reduce__(self): |
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31 return (REGEXTerm, (str(''),)) |
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32 |
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33 |
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34 def regexCompareQuad(quad, regexQuad): |
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35 for index in range(4): |
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36 if isinstance(regexQuad[index], REGEXTerm) and not \ |
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37 regexQuad[index].compiledExpr.match(quad[index]): |
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38 return False |
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39 return True |
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40 |
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41 |
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42 class REGEXMatching(Store): |
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43 def __init__(self, storage): |
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44 self.storage = storage |
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45 self.context_aware = storage.context_aware |
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46 # NOTE: this store can't be formula_aware as it doesn't have enough |
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47 # info to reverse the removal of a quoted statement. |
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48 self.formula_aware = storage.formula_aware |
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49 self.transaction_aware = storage.transaction_aware |
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50 |
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51 def open(self, configuration, create=True): |
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52 return self.storage.open(configuration, create) |
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53 |
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54 def close(self, commit_pending_transaction=False): |
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55 self.storage.close() |
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56 |
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57 def destroy(self, configuration): |
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58 self.storage.destroy(configuration) |
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59 |
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60 def add(self, triple, context, quoted=False): |
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61 (subject, predicate, object_) = triple |
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62 self.storage.add((subject, predicate, object_), context, quoted) |
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63 |
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64 def remove(self, triple, context=None): |
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65 (subject, predicate, object_) = triple |
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66 if isinstance(subject, REGEXTerm) or \ |
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67 isinstance(predicate, REGEXTerm) or \ |
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68 isinstance(object_, REGEXTerm) or \ |
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69 (context is not None |
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70 and isinstance(context.identifier, REGEXTerm)): |
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71 # One or more of the terms is a REGEX expression, so we must |
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72 # replace it / them with wildcard(s)and match after we query. |
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73 s = not isinstance(subject, REGEXTerm) and subject or None |
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74 p = not isinstance(predicate, REGEXTerm) and predicate or None |
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75 o = not isinstance(object_, REGEXTerm) and object_ or None |
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76 c = (context is not None |
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77 and not isinstance(context.identifier, REGEXTerm)) \ |
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78 and context \ |
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79 or None |
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80 |
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81 removeQuadList = [] |
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82 for (s1, p1, o1), cg in self.storage.triples((s, p, o), c): |
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83 for ctx in cg: |
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84 ctx = ctx.identifier |
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85 if regexCompareQuad( |
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86 (s1, p1, o1, ctx), |
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87 (subject, predicate, object_, context |
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88 is not None and context.identifier or context)): |
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89 removeQuadList.append((s1, p1, o1, ctx)) |
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90 for s, p, o, c in removeQuadList: |
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91 self.storage.remove((s, p, o), c and Graph(self, c) or c) |
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92 else: |
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93 self.storage.remove((subject, predicate, object_), context) |
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94 |
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95 def triples(self, triple, context=None): |
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96 (subject, predicate, object_) = triple |
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97 if isinstance(subject, REGEXTerm) or \ |
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98 isinstance(predicate, REGEXTerm) or \ |
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99 isinstance(object_, REGEXTerm) or \ |
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100 (context is not None |
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101 and isinstance(context.identifier, REGEXTerm)): |
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102 # One or more of the terms is a REGEX expression, so we must |
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103 # replace it / them with wildcard(s) and match after we query. |
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104 s = not isinstance(subject, REGEXTerm) and subject or None |
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105 p = not isinstance(predicate, REGEXTerm) and predicate or None |
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106 o = not isinstance(object_, REGEXTerm) and object_ or None |
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107 c = (context is not None |
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108 and not isinstance(context.identifier, REGEXTerm)) \ |
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109 and context \ |
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110 or None |
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111 for (s1, p1, o1), cg in self.storage.triples((s, p, o), c): |
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112 matchingCtxs = [] |
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113 for ctx in cg: |
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114 if c is None: |
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115 if context is None \ |
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116 or context.identifier.compiledExpr.match( |
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117 ctx.identifier): |
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118 matchingCtxs.append(ctx) |
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119 else: |
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120 matchingCtxs.append(ctx) |
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121 if matchingCtxs \ |
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122 and regexCompareQuad((s1, p1, o1, None), |
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123 (subject, predicate, object_, None)): |
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124 yield (s1, p1, o1), (c for c in matchingCtxs) |
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125 else: |
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126 for (s1, p1, o1), cg in self.storage.triples( |
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127 (subject, predicate, object_), context): |
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128 yield (s1, p1, o1), cg |
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129 |
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130 def __len__(self, context=None): |
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131 # NOTE: If the context is a REGEX this could be an expensive |
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132 # proposition |
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133 return self.storage.__len__(context) |
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134 |
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135 def contexts(self, triple=None): |
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136 # NOTE: There is no way to control REGEX matching for this method at |
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137 # this level as it only returns the contexts, not the matching |
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138 # triples. |
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139 for ctx in self.storage.contexts(triple): |
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140 yield ctx |
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141 |
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142 def remove_context(self, identifier): |
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143 self.storage.remove((None, None, None), identifier) |
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144 |
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145 def bind(self, prefix, namespace): |
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146 self.storage.bind(prefix, namespace) |
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147 |
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148 def prefix(self, namespace): |
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149 return self.storage.prefix(namespace) |
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150 |
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151 def namespace(self, prefix): |
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152 return self.storage.namespace(prefix) |
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153 |
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154 def namespaces(self): |
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155 return self.storage.namespaces() |
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156 |
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157 def commit(self): |
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158 self.storage.commit() |
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159 |
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160 def rollback(self): |
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161 self.storage.rollback() |