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annotate planemo/lib/python3.7/site-packages/rdflib/plugins/sparql/algebra.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1
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2 """
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3 Converting the 'parse-tree' output of pyparsing to a SPARQL Algebra expression
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4
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5 http://www.w3.org/TR/sparql11-query/#sparqlQuery
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6
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7 """
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8
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9 import functools
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10 import operator
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11 import collections
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12
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13 from rdflib import Literal, Variable, URIRef, BNode
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14
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15 from rdflib.plugins.sparql.sparql import Prologue, Query
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16 from rdflib.plugins.sparql.parserutils import CompValue, Expr
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17 from rdflib.plugins.sparql.operators import (
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18 and_, TrueFilter, simplify as simplifyFilters)
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19 from rdflib.paths import (
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20 InvPath, AlternativePath, SequencePath, MulPath, NegatedPath)
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21
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22 from pyparsing import ParseResults
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23 from functools import reduce
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24
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25
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26 # ---------------------------
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27 # Some convenience methods
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28 def OrderBy(p, expr):
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29 return CompValue('OrderBy', p=p, expr=expr)
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31
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32 def ToMultiSet(p):
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33 return CompValue('ToMultiSet', p=p)
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35
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36 def Union(p1, p2):
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37 return CompValue('Union', p1=p1, p2=p2)
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39
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40 def Join(p1, p2):
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41 return CompValue('Join', p1=p1, p2=p2)
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43
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44 def Minus(p1, p2):
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45 return CompValue('Minus', p1=p1, p2=p2)
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46
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47
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48 def Graph(term, graph):
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49 return CompValue('Graph', term=term, p=graph)
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51
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52 def BGP(triples=None):
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53 return CompValue('BGP', triples=triples or [])
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55
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56 def LeftJoin(p1, p2, expr):
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57 return CompValue('LeftJoin', p1=p1, p2=p2, expr=expr)
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58
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59
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60 def Filter(expr, p):
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61 return CompValue('Filter', expr=expr, p=p)
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63
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64 def Extend(p, expr, var):
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65 return CompValue('Extend', p=p, expr=expr, var=var)
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66
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67 def Values(res):
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68 return CompValue('values', res=res)
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69
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70 def Project(p, PV):
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71 return CompValue('Project', p=p, PV=PV)
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73
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74 def Group(p, expr=None):
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75 return CompValue('Group', p=p, expr=expr)
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77
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78 def _knownTerms(triple, varsknown, varscount):
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79 return (len([_f for _f in (x not in varsknown and
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80 isinstance(
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81 x, (Variable, BNode)) for x in triple) if _f]),
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82 -sum(varscount.get(x, 0) for x in triple),
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83 not isinstance(triple[2], Literal),
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84 )
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85
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86
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87 def reorderTriples(l):
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88 """
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89 Reorder triple patterns so that we execute the
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90 ones with most bindings first
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91 """
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92
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93 def _addvar(term, varsknown):
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94 if isinstance(term, (Variable, BNode)):
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95 varsknown.add(term)
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96
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97 l = [(None, x) for x in l]
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98 varsknown = set()
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99 varscount = collections.defaultdict(int)
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100 for t in l:
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101 for c in t[1]:
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102 if isinstance(c, (Variable, BNode)):
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103 varscount[c] += 1
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104 i = 0
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105
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106 # Done in steps, sort by number of bound terms
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107 # the top block of patterns with the most bound terms is kept
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108 # the rest is resorted based on the vars bound after the first
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109 # block is evaluated
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110
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111 # we sort by decorate/undecorate, since we need the value of the sort keys
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112
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113 while i < len(l):
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114 l[i:] = sorted((_knownTerms(x[
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115 1], varsknown, varscount), x[1]) for x in l[i:])
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116 t = l[i][0][0] # top block has this many terms bound
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117 j = 0
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118 while i+j < len(l) and l[i+j][0][0] == t:
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119 for c in l[i+j][1]:
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120 _addvar(c, varsknown)
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121 j += 1
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122 i += 1
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123
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124 return [x[1] for x in l]
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125
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126
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127 def triples(l):
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128
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129 l = reduce(lambda x, y: x + y, l)
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130 if (len(l) % 3) != 0:
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131 raise Exception('these aint triples')
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132 return reorderTriples((l[x], l[x + 1], l[x + 2])
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133 for x in range(0, len(l), 3))
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134
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135
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136 def translatePName(p, prologue):
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137 """
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138 Expand prefixed/relative URIs
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139 """
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140 if isinstance(p, CompValue):
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141 if p.name == 'pname':
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142 return prologue.absolutize(p)
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143 if p.name == 'literal':
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144 return Literal(p.string, lang=p.lang,
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145 datatype=prologue.absolutize(p.datatype))
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146 elif isinstance(p, URIRef):
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147 return prologue.absolutize(p)
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148
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149
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150 def translatePath(p):
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151
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152 """
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153 Translate PropertyPath expressions
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154 """
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155
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156 if isinstance(p, CompValue):
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157 if p.name == 'PathAlternative':
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158 if len(p.part) == 1:
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159 return p.part[0]
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160 else:
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161 return AlternativePath(*p.part)
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162
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163 elif p.name == 'PathSequence':
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164 if len(p.part) == 1:
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165 return p.part[0]
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166 else:
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167 return SequencePath(*p.part)
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168
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169 elif p.name == 'PathElt':
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170 if not p.mod:
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171 return p.part
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172 else:
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173 if isinstance(p.part, list):
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174 if len(p.part) != 1:
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175 raise Exception('Denkfehler!')
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176
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177 return MulPath(p.part[0], p.mod)
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178 else:
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179 return MulPath(p.part, p.mod)
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180
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181 elif p.name == 'PathEltOrInverse':
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182 if isinstance(p.part, list):
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183 if len(p.part) != 1:
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184 raise Exception('Denkfehler!')
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185 return InvPath(p.part[0])
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186 else:
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187 return InvPath(p.part)
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188
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189 elif p.name == 'PathNegatedPropertySet':
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190 if isinstance(p.part, list):
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191 return NegatedPath(AlternativePath(*p.part))
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192 else:
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193 return NegatedPath(p.part)
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194
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195
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196 def translateExists(e):
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197
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198 """
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199 Translate the graph pattern used by EXISTS and NOT EXISTS
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200 http://www.w3.org/TR/sparql11-query/#sparqlCollectFilters
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201 """
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202
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203 def _c(n):
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204 if isinstance(n, CompValue):
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205 if n.name in ('Builtin_EXISTS', 'Builtin_NOTEXISTS'):
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206 n.graph = translateGroupGraphPattern(n.graph)
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207 if n.graph.name == 'Filter':
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208 # filters inside (NOT) EXISTS can see vars bound outside
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209 n.graph.no_isolated_scope = True
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210
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211 e = traverse(e, visitPost=_c)
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212
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213 return e
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214
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215
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216 def collectAndRemoveFilters(parts):
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217
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218 """
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219
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220 FILTER expressions apply to the whole group graph pattern in which
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221 they appear.
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222
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223 http://www.w3.org/TR/sparql11-query/#sparqlCollectFilters
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224 """
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225
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226 filters = []
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227
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228 i = 0
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229 while i < len(parts):
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230 p = parts[i]
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231 if p.name == 'Filter':
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232 filters.append(translateExists(p.expr))
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233 parts.pop(i)
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234 else:
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235 i += 1
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236
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237 if filters:
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238 return and_(*filters)
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239
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240 return None
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241
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242
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243 def translateGroupOrUnionGraphPattern(graphPattern):
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244 A = None
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245
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246 for g in graphPattern.graph:
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247 g = translateGroupGraphPattern(g)
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248 if not A:
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249 A = g
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250 else:
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251 A = Union(A, g)
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252 return A
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253
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254
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255 def translateGraphGraphPattern(graphPattern):
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256 return Graph(graphPattern.term,
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257 translateGroupGraphPattern(graphPattern.graph))
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258
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259
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260 def translateInlineData(graphPattern):
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261 return ToMultiSet(translateValues(graphPattern))
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262
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263
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264 def translateGroupGraphPattern(graphPattern):
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265 """
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266 http://www.w3.org/TR/sparql11-query/#convertGraphPattern
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267 """
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268
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269 if graphPattern.name == 'SubSelect':
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270 return ToMultiSet(translate(graphPattern)[0])
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271
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272 if not graphPattern.part:
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273 graphPattern.part = [] # empty { }
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274
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275 filters = collectAndRemoveFilters(graphPattern.part)
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276
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277 g = []
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278 for p in graphPattern.part:
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279 if p.name == 'TriplesBlock':
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280 # merge adjacent TripleBlocks
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281 if not (g and g[-1].name == 'BGP'):
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282 g.append(BGP())
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283 g[-1]["triples"] += triples(p.triples)
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284 else:
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285 g.append(p)
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286
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287 G = BGP()
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288 for p in g:
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289 if p.name == 'OptionalGraphPattern':
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290 A = translateGroupGraphPattern(p.graph)
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291 if A.name == 'Filter':
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292 G = LeftJoin(G, A.p, A.expr)
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293 else:
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294 G = LeftJoin(G, A, TrueFilter)
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295 elif p.name == 'MinusGraphPattern':
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296 G = Minus(p1=G, p2=translateGroupGraphPattern(p.graph))
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297 elif p.name == 'GroupOrUnionGraphPattern':
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298 G = Join(p1=G, p2=translateGroupOrUnionGraphPattern(p))
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299 elif p.name == 'GraphGraphPattern':
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300 G = Join(p1=G, p2=translateGraphGraphPattern(p))
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301 elif p.name == 'InlineData':
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302 G = Join(p1=G, p2=translateInlineData(p))
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303 elif p.name == 'ServiceGraphPattern':
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304 G = Join(p1=G, p2=p)
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305 elif p.name in ('BGP', 'Extend'):
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306 G = Join(p1=G, p2=p)
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307 elif p.name == 'Bind':
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308 G = Extend(G, p.expr, p.var)
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309
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310 else:
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311 raise Exception('Unknown part in GroupGraphPattern: %s - %s' %
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312 (type(p), p.name))
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313
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314 if filters:
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315 G = Filter(expr=filters, p=G)
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316
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317 return G
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318
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319
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320 class StopTraversal(Exception):
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321 def __init__(self, rv):
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322 self.rv = rv
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323
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324
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325 def _traverse(e, visitPre=lambda n: None, visitPost=lambda n: None):
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326 """
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327 Traverse a parse-tree, visit each node
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328
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329 if visit functions return a value, replace current node
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330 """
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331 _e = visitPre(e)
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332 if _e is not None:
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333 return _e
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334
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335 if e is None:
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336 return None
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337
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338 if isinstance(e, (list, ParseResults)):
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339 return [_traverse(x, visitPre, visitPost) for x in e]
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340 elif isinstance(e, tuple):
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341 return tuple([_traverse(x, visitPre, visitPost) for x in e])
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342
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343 elif isinstance(e, CompValue):
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344 for k, val in e.items():
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345 e[k] = _traverse(val, visitPre, visitPost)
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346
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347 _e = visitPost(e)
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348 if _e is not None:
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349 return _e
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350
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351 return e
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352
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353
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354 def _traverseAgg(e, visitor=lambda n, v: None):
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355 """
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356 Traverse a parse-tree, visit each node
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357
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358 if visit functions return a value, replace current node
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359 """
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360
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361 res = []
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362
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363 if isinstance(e, (list, ParseResults, tuple)):
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364 res = [_traverseAgg(x, visitor) for x in e]
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365
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366 elif isinstance(e, CompValue):
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367 for k, val in e.items():
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368 if val != None:
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369 res.append(_traverseAgg(val, visitor))
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370
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371 return visitor(e, res)
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372
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373
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374 def traverse(
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375 tree, visitPre=lambda n: None,
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376 visitPost=lambda n: None, complete=None):
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377 """
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378 Traverse tree, visit each node with visit function
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379 visit function may raise StopTraversal to stop traversal
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380 if complete!=None, it is returned on complete traversal,
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381 otherwise the transformed tree is returned
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382 """
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383 try:
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384 r = _traverse(tree, visitPre, visitPost)
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385 if complete is not None:
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386 return complete
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387 return r
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388 except StopTraversal as st:
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389 return st.rv
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390
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391
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392 def _hasAggregate(x):
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393 """
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394 Traverse parse(sub)Tree
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395 return true if any aggregates are used
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396 """
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397
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398 if isinstance(x, CompValue):
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399 if x.name.startswith('Aggregate_'):
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400 raise StopTraversal(True)
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401
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402
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403 def _aggs(e, A):
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404 """
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405 Collect Aggregates in A
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406 replaces aggregates with variable references
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407 """
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408
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409 # TODO: nested Aggregates?
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410
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411 if isinstance(e, CompValue) and e.name.startswith('Aggregate_'):
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412 A.append(e)
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413 aggvar = Variable('__agg_%d__' % len(A))
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414 e["res"] = aggvar
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415 return aggvar
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416
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417
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418 def _findVars(x, res):
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419 """
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420 Find all variables in a tree
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421 """
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422 if isinstance(x, Variable):
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423 res.add(x)
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424 if isinstance(x, CompValue):
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425 if x.name == "Bind":
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426 res.add(x.var)
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427 return x # stop recursion and finding vars in the expr
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428 elif x.name == 'SubSelect':
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429 if x.projection:
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430 res.update(v.var or v.evar for v in x.projection)
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431 return x
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432
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433
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434 def _addVars(x, children):
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435 """
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436 find which variables may be bound by this part of the query
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437 """
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438 if isinstance(x, Variable):
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439 return set([x])
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440 elif isinstance(x, CompValue):
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441 if x.name == "RelationalExpression":
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442 x["_vars"] = set()
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443 elif x.name == "Extend":
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444 # vars only used in the expr for a bind should not be included
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445 x["_vars"] = reduce(operator.or_, [ child for child,part in zip(children,x) if part!='expr' ], set())
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446
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447 else:
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448 x["_vars"] = set(reduce(operator.or_, children, set()))
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449
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450 if x.name == 'SubSelect':
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451 if x.projection:
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452 s = set(v.var or v.evar for v in x.projection)
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453 else:
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454 s = set()
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455
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456 return s
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457
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458 return x["_vars"]
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459
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460 return reduce(operator.or_, children, set())
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461
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462
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463 def _sample(e, v=None):
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464 """
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465 For each unaggregated variable V in expr
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466 Replace V with Sample(V)
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467 """
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468 if isinstance(e, CompValue) and e.name.startswith("Aggregate_"):
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469 return e # do not replace vars in aggregates
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470 if isinstance(e, Variable) and v != e:
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471 return CompValue('Aggregate_Sample', vars=e)
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472
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473
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474 def _simplifyFilters(e):
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475 if isinstance(e, Expr):
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476 return simplifyFilters(e)
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477
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478
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479 def translateAggregates(q, M):
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480 E = []
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481 A = []
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482
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483 # collect/replace aggs in :
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484 # select expr as ?var
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485 if q.projection:
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486 for v in q.projection:
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487 if v.evar:
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488 v.expr = traverse(v.expr, functools.partial(_sample, v=v.evar))
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489 v.expr = traverse(v.expr, functools.partial(_aggs, A=A))
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490
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491
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492 # having clause
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493 if traverse(q.having, _hasAggregate, complete=False):
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494 q.having = traverse(q.having, _sample)
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495 traverse(q.having, functools.partial(_aggs, A=A))
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496
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497 # order by
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498 if traverse(q.orderby, _hasAggregate, complete=False):
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499 q.orderby = traverse(q.orderby, _sample)
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500 traverse(q.orderby, functools.partial(_aggs, A=A))
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501
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502 # sample all other select vars
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503 # TODO: only allowed for vars in group-by?
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504 if q.projection:
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505 for v in q.projection:
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506 if v.var:
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507 rv = Variable('__agg_%d__' % (len(A) + 1))
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508 A.append(CompValue('Aggregate_Sample', vars=v.var, res=rv))
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509 E.append((rv, v.var))
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510
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511 return CompValue('AggregateJoin', A=A, p=M), E
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512
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513
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514 def translateValues(v):
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515 # if len(v.var)!=len(v.value):
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516 # raise Exception("Unmatched vars and values in ValueClause: "+str(v))
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517
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518 res = []
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519 if not v.var:
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520 return res
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521 if not v.value:
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522 return res
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523 if not isinstance(v.value[0], list):
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524
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525 for val in v.value:
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526 res.append({v.var[0]: val})
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diff changeset
527 else:
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528 for vals in v.value:
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diff changeset
529 res.append(dict(list(zip(v.var, vals))))
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diff changeset
530
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parents:
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531 return Values(res)
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parents:
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532
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533
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534 def translate(q):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
diff changeset
535 """
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
diff changeset
536 http://www.w3.org/TR/sparql11-query/#convertSolMod
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parents:
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537
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538 """
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parents:
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539
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diff changeset
540 _traverse(q, _simplifyFilters)
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541
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diff changeset
542 q.where = traverse(q.where, visitPost=translatePath)
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guerler
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543
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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544 # TODO: Var scope test
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545 VS = set()
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diff changeset
546 traverse(q.where, functools.partial(_findVars, res=VS))
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547
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548 # all query types have a where part
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549 M = translateGroupGraphPattern(q.where)
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550
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551 aggregate = False
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552 if q.groupby:
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553 conditions = []
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guerler
parents:
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554 # convert "GROUP BY (?expr as ?var)" to an Extend
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
555 for c in q.groupby.condition:
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parents:
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556 if isinstance(c, CompValue) and c.name == 'GroupAs':
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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557 M = Extend(M, c.expr, c.var)
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558 c = c.var
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559 conditions.append(c)
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560
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561 M = Group(p=M, expr=conditions)
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parents:
diff changeset
562 aggregate = True
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563 elif traverse(q.having, _hasAggregate, complete=False) or \
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
diff changeset
564 traverse(q.orderby, _hasAggregate, complete=False) or \
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
565 any(traverse(x.expr, _hasAggregate, complete=False)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
diff changeset
566 for x in q.projection or [] if x.evar):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
567 # if any aggregate is used, implicit group by
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parents:
diff changeset
568 M = Group(p=M)
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diff changeset
569 aggregate = True
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diff changeset
570
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diff changeset
571 if aggregate:
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diff changeset
572 M, E = translateAggregates(q, M)
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573 else:
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574 E = []
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575
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576 # HAVING
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577 if q.having:
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578 M = Filter(expr=and_(*q.having.condition), p=M)
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579
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580 # VALUES
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581 if q.valuesClause:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
582 M = Join(p1=M, p2=ToMultiSet(translateValues(q.valuesClause)))
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583
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584 if not q.projection:
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diff changeset
585 # select *
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586 PV = list(VS)
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587 else:
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588 PV = list()
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diff changeset
589 for v in q.projection:
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590 if v.var:
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591 if v not in PV:
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592 PV.append(v.var)
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593 elif v.evar:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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594 if v not in PV:
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595 PV.append(v.evar)
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596
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597 E.append((v.expr, v.evar))
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598 else:
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599 raise Exception("I expected a var or evar here!")
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600
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diff changeset
601 for e, v in E:
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diff changeset
602 M = Extend(M, e, v)
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diff changeset
603
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guerler
parents:
diff changeset
604 # ORDER BY
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parents:
diff changeset
605 if q.orderby:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
606 M = OrderBy(M, [CompValue('OrderCondition', expr=c.expr,
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
607 order=c.order) for c in q.orderby.condition])
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guerler
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diff changeset
608
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guerler
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diff changeset
609 # PROJECT
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diff changeset
610 M = Project(M, PV)
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diff changeset
611
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
diff changeset
612 if q.modifier:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
613 if q.modifier == 'DISTINCT':
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
614 M = CompValue('Distinct', p=M)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
615 elif q.modifier == 'REDUCED':
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
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diff changeset
616 M = CompValue('Reduced', p=M)
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diff changeset
617
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diff changeset
618 if q.limitoffset:
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diff changeset
619 offset = 0
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
620 if q.limitoffset.offset != None:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
621 offset = q.limitoffset.offset.toPython()
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guerler
parents:
diff changeset
622
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guerler
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diff changeset
623 if q.limitoffset.limit != None:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
624 M = CompValue('Slice', p=M, start=offset,
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
625 length=q.limitoffset.limit.toPython())
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diff changeset
626 else:
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parents:
diff changeset
627 M = CompValue('Slice', p=M, start=offset)
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guerler
parents:
diff changeset
628
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diff changeset
629 return M, PV
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guerler
parents:
diff changeset
630
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diff changeset
631
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diff changeset
632 def simplify(n):
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diff changeset
633 """Remove joins to empty BGPs"""
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
634 if isinstance(n, CompValue):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
diff changeset
635 if n.name == 'Join':
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
636 if n.p1.name == 'BGP' and len(n.p1.triples) == 0:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
637 return n.p2
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
638 if n.p2.name == 'BGP' and len(n.p2.triples) == 0:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
639 return n.p1
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
640 elif n.name == 'BGP':
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
641 n["triples"] = reorderTriples(n.triples)
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guerler
parents:
diff changeset
642 return n
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parents:
diff changeset
643
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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644
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645 def analyse(n, children):
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diff changeset
646
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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647 """
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
648 Some things can be lazily joined.
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
649 This propegates whether they can up the tree
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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650 and sets lazy flags for all joins
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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651 """
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
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diff changeset
652
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
653 if isinstance(n, CompValue):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
654 if n.name == 'Join':
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
655 n["lazy"] = all(children)
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guerler
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656 return False
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
657 elif n.name in ('Slice', 'Distinct'):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
658 return False
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
659 else:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
660 return all(children)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
661 else:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
662 return True
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
663
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
664
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
665 def translatePrologue(p, base, initNs=None, prologue=None):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
666
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
667 if prologue is None:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
668 prologue = Prologue()
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
669 prologue.base = ""
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
670 if base:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
671 prologue.base = base
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
672 if initNs:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
673 for k, v in initNs.items():
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
674 prologue.bind(k, v)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
675
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
676 for x in p:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
677 if x.name == 'Base':
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
678 prologue.base = x.iri
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
679 elif x.name == 'PrefixDecl':
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
680 prologue.bind(x.prefix, prologue.absolutize(x.iri))
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
681
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
682 return prologue
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
683
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
684
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
685 def translateQuads(quads):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
686 if quads.triples:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
687 alltriples = triples(quads.triples)
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guerler
parents:
diff changeset
688 else:
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guerler
parents:
diff changeset
689 alltriples = []
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guerler
parents:
diff changeset
690
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
691 allquads = collections.defaultdict(list)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
692
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
693 if quads.quadsNotTriples:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
694 for q in quads.quadsNotTriples:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
695 if q.triples:
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guerler
parents:
diff changeset
696 allquads[q.term] += triples(q.triples)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
697
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guerler
parents:
diff changeset
698 return alltriples, allquads
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
699
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guerler
parents:
diff changeset
700
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
701 def translateUpdate1(u, prologue):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
702 if u.name in ('Load', 'Clear', 'Drop', 'Create'):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
703 pass # no translation needed
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
704 elif u.name in ('Add', 'Move', 'Copy'):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
705 pass
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
706 elif u.name in ('InsertData', 'DeleteData', 'DeleteWhere'):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
707 t, q = translateQuads(u.quads)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
708 u["quads"] = q
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
709 u["triples"] = t
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
710 if u.name in ('DeleteWhere', 'DeleteData'):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
711 pass # TODO: check for bnodes in triples
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
712 elif u.name == 'Modify':
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
713 if u.delete:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
714 u.delete["triples"], u.delete[
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
715 "quads"] = translateQuads(u.delete.quads)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
716 if u.insert:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
717 u.insert["triples"], u.insert[
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
718 "quads"] = translateQuads(u.insert.quads)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
719 u["where"] = translateGroupGraphPattern(u.where)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
720 else:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
721 raise Exception('Unknown type of update operation: %s' % u)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
722
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
723 u.prologue = prologue
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
724 return u
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
725
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
726
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
727 def translateUpdate(q, base=None, initNs=None):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
728 """
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
729 Returns a list of SPARQL Update Algebra expressions
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
730 """
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
731
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
732 res = []
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
733 prologue = None
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
734 if not q.request:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
735 return res
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
736 for p, u in zip(q.prologue, q.request):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
737 prologue = translatePrologue(p, base, initNs, prologue)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
738
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
739 # absolutize/resolve prefixes
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
740 u = traverse(
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
741 u, visitPost=functools.partial(translatePName, prologue=prologue))
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
742 u = _traverse(u, _simplifyFilters)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
743
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
744 u = traverse(u, visitPost=translatePath)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
745
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
746 res.append(translateUpdate1(u, prologue))
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
747
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
748 return res
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
749
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
750
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
751 def translateQuery(q, base=None, initNs=None):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
752 """
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
753 Translate a query-parsetree to a SPARQL Algebra Expression
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
754
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
755 Return a rdflib.plugins.sparql.sparql.Query object
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
756 """
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
757
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
758 # We get in: (prologue, query)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
759
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
760 prologue = translatePrologue(q[0], base, initNs)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
761
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
762 # absolutize/resolve prefixes
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
763 q[1] = traverse(
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
764 q[1], visitPost=functools.partial(translatePName, prologue=prologue))
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
765
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
766 P, PV = translate(q[1])
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
767 datasetClause = q[1].datasetClause
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
768 if q[1].name == 'ConstructQuery':
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
769
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
770 template = triples(q[1].template) if q[1].template else None
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
771
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
772 res = CompValue(q[1].name, p=P,
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
773 template=template,
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
774 datasetClause=datasetClause)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
775 else:
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
776 res = CompValue(q[1].name, p=P, datasetClause=datasetClause, PV=PV)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
777
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
778 res = traverse(res, visitPost=simplify)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
779 _traverseAgg(res, visitor=analyse)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
780 _traverseAgg(res, _addVars)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
781
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
782 return Query(prologue, res)
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
783
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
784
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
785 def pprintAlgebra(q):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
786 def pp(p, ind=" "):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
787 # if isinstance(p, list):
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
788 # print "[ "
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789 # for x in p: pp(x,ind)
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790 # print "%s ]"%ind
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791 # return
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792 if not isinstance(p, CompValue):
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793 print(p)
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794 return
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795 print("%s(" % (p.name, ))
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796 for k in p:
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797 print("%s%s =" % (ind, k,), end=' ')
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798 pp(p[k], ind + " ")
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799 print("%s)" % ind)
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800
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801 try:
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802 pp(q.algebra)
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803 except AttributeError:
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804 # it's update, just a list
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805 for x in q:
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806 pp(x)
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807
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808 if __name__ == '__main__':
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809 import sys
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810 from rdflib.plugins.sparql import parser
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811 import os.path
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812
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813 if os.path.exists(sys.argv[1]):
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814 q = file(sys.argv[1])
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815 else:
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816 q = sys.argv[1]
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817
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818 pq = parser.parseQuery(q)
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819 print(pq)
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820 tq = translateQuery(pq)
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821 print(pprintAlgebra(tq))