Mercurial > repos > shellac > sam_consensus_v3

annotate env/lib/python3.9/site-packages/rdflib/query.py @ 0:4f3585e2f14b draft default tip

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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author shellac
date Mon, 22 Mar 2021 18:12:50 +0000
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1 from __future__ import absolute_import
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2 from __future__ import division
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3 from __future__ import print_function
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4
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5 import os
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6 import itertools
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7 import shutil
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8 import tempfile
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9 import warnings
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10 import types
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11
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12 from six import BytesIO
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13 from six import PY2
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14 from six import text_type
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15 from six.moves.urllib.parse import urlparse
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16
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17 __all__ = ['Processor', 'Result', 'ResultParser', 'ResultSerializer',
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18 'ResultException']
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19
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20
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21 class Processor(object):
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22 """
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23 Query plugin interface.
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24
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25 This module is useful for those wanting to write a query processor
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26 that can plugin to rdf. If you are wanting to execute a query you
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27 likely want to do so through the Graph class query method.
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28
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29 """
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30
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31 def __init__(self, graph):
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32 pass
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33
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34 def query(self, strOrQuery, initBindings={}, initNs={}, DEBUG=False):
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35 pass
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36
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37
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38 class UpdateProcessor(object):
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39 """
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40 Update plugin interface.
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41
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42 This module is useful for those wanting to write an update
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43 processor that can plugin to rdflib. If you are wanting to execute
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44 an update statement you likely want to do so through the Graph
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45 class update method.
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46
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47 .. versionadded:: 4.0
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48
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49 """
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50
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51 def __init__(self, graph):
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52 pass
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53
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54 def update(self, strOrQuery, initBindings={}, initNs={}):
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55 pass
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56
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57
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58 class ResultException(Exception):
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59 pass
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60
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61
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62 class EncodeOnlyUnicode(object):
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63 """
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64 This is a crappy work-around for
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65 http://bugs.python.org/issue11649
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66
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67
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68 """
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69
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70 def __init__(self, stream):
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71 self.__stream = stream
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72
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73 def write(self, arg):
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74 if isinstance(arg, text_type):
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75 self.__stream.write(arg.encode("utf-8"))
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76 else:
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77 self.__stream.write(arg)
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78
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79 def __getattr__(self, name):
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80 return getattr(self.__stream, name)
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81
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82
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83 class ResultRow(tuple):
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84 """
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85 a single result row
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86 allows accessing bindings as attributes or with []
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87
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88 >>> from rdflib import URIRef, Variable
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89 >>> rr=ResultRow({ Variable('a'): URIRef('urn:cake') }, [Variable('a')])
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90
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91 >>> rr[0]
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92 rdflib.term.URIRef(u'urn:cake')
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93 >>> rr[1]
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94 Traceback (most recent call last):
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95 ...
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96 IndexError: tuple index out of range
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97
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98 >>> rr.a
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99 rdflib.term.URIRef(u'urn:cake')
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100 >>> rr.b
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101 Traceback (most recent call last):
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102 ...
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103 AttributeError: b
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104
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105 >>> rr['a']
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106 rdflib.term.URIRef(u'urn:cake')
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107 >>> rr['b']
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108 Traceback (most recent call last):
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109 ...
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110 KeyError: 'b'
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111
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112 >>> rr[Variable('a')]
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113 rdflib.term.URIRef(u'urn:cake')
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114
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115 .. versionadded:: 4.0
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116
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117 """
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118
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119 def __new__(cls, values, labels):
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120
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121 instance = super(ResultRow, cls).__new__(
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122 cls, (values.get(v) for v in labels))
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123 instance.labels = dict((text_type(x[1]), x[0])
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124 for x in enumerate(labels))
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125 return instance
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126
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127 def __getattr__(self, name):
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128 if name not in self.labels:
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129 raise AttributeError(name)
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130 return tuple.__getitem__(self, self.labels[name])
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131
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132 def __getitem__(self, name):
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133 try:
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134 return tuple.__getitem__(self, name)
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135 except TypeError:
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136 if name in self.labels:
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137 return tuple.__getitem__(self, self.labels[name])
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138 if text_type(name) in self.labels: # passing in variable object
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139 return tuple.__getitem__(self, self.labels[text_type(name)])
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140 raise KeyError(name)
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141
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142 def get(self, name, default=None):
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143 try:
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144 return self[name]
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145 except KeyError:
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146 return default
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147
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148 def asdict(self):
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149 return dict((v, self[v]) for v in self.labels if self[v] is not None)
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150
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151
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152 class Result(object):
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153 """
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154 A common class for representing query result.
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155
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156 There is a bit of magic here that makes this appear like different
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157 Python objects, depending on the type of result.
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158
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159 If the type is "SELECT", iterating will yield lists of ResultRow objects
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160
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161 If the type is "ASK", iterating will yield a single bool (or
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162 bool(result) will return the same bool)
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163
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164 If the type is "CONSTRUCT" or "DESCRIBE" iterating will yield the
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165 triples.
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166
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167 len(result) also works.
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168
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169 """
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170
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171 def __init__(self, type_):
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172
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173 if type_ not in ('CONSTRUCT', 'DESCRIBE', 'SELECT', 'ASK'):
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174 raise ResultException('Unknown Result type: %s' % type_)
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175
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176 self.type = type_
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177 self.vars = None
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178 self._bindings = None
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179 self._genbindings = None
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180 self.askAnswer = None
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181 self.graph = None
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182
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183 def _get_bindings(self):
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184 if self._genbindings:
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185 self._bindings += list(self._genbindings)
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186 self._genbindings = None
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187
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188 return self._bindings
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189
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190 def _set_bindings(self, b):
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191 if isinstance(b, (types.GeneratorType, itertools.islice)):
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192 self._genbindings = b
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193 self._bindings = []
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194 else:
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195 self._bindings = b
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196
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197 bindings = property(
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198 _get_bindings, _set_bindings, doc="a list of variable bindings as dicts")
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199
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200 @staticmethod
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201 def parse(source=None, format=None, content_type=None, **kwargs):
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202 from rdflib import plugin
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203
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204 if format:
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205 plugin_key = format
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206 elif content_type:
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207 plugin_key = content_type.split(";", 1)[0]
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208 else:
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209 plugin_key = 'xml'
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210
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211 parser = plugin.get(plugin_key, ResultParser)()
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212
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213 return parser.parse(source, content_type=content_type, **kwargs)
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214
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215 def serialize(
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216 self, destination=None, encoding="utf-8", format='xml', **args):
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217
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218 if self.type in ('CONSTRUCT', 'DESCRIBE'):
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219 return self.graph.serialize(
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220 destination, encoding=encoding, format=format, **args)
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221
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222 """stolen wholesale from graph.serialize"""
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223 from rdflib import plugin
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224 serializer = plugin.get(format, ResultSerializer)(self)
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225 if destination is None:
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226 stream = BytesIO()
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227 stream2 = EncodeOnlyUnicode(stream)
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228 serializer.serialize(stream2, encoding=encoding, **args)
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229 return stream.getvalue()
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230 if hasattr(destination, "write"):
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231 stream = destination
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232 serializer.serialize(stream, encoding=encoding, **args)
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233 else:
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234 location = destination
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235 scheme, netloc, path, params, query, fragment = urlparse(location)
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236 if netloc != "":
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237 print("WARNING: not saving as location" +
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238 "is not a local file reference")
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239 return
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240 fd, name = tempfile.mkstemp()
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241 stream = os.fdopen(fd, 'wb')
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242 serializer.serialize(stream, encoding=encoding, **args)
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243 stream.close()
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244 if hasattr(shutil, "move"):
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245 shutil.move(name, path)
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246 else:
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247 shutil.copy(name, path)
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248 os.remove(name)
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249
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250 def __len__(self):
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251 if self.type == 'ASK':
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252 return 1
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253 elif self.type == 'SELECT':
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254 return len(self.bindings)
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255 else:
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256 return len(self.graph)
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257
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258 def __bool__(self):
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259 if self.type == 'ASK':
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260 return self.askAnswer
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261 else:
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262 return len(self) > 0
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263
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264 if PY2:
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265 __nonzero__ = __bool__
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266
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267 def __iter__(self):
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268 if self.type in ("CONSTRUCT", "DESCRIBE"):
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269 for t in self.graph:
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270 yield t
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271 elif self.type == 'ASK':
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272 yield self.askAnswer
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273 elif self.type == 'SELECT':
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274 # this iterates over ResultRows of variable bindings
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275
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276 if self._genbindings:
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277 for b in self._genbindings:
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278 if b: # don't add a result row in case of empty binding {}
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279 self._bindings.append(b)
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280 yield ResultRow(b, self.vars)
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281 self._genbindings = None
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282 else:
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283 for b in self._bindings:
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284 if b: # don't add a result row in case of empty binding {}
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285 yield ResultRow(b, self.vars)
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286
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287 def __getattr__(self, name):
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288 if self.type in ("CONSTRUCT", "DESCRIBE") and self.graph is not None:
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289 return self.graph.__getattr__(self, name)
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290 elif self.type == 'SELECT' and name == 'result':
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291 warnings.warn(
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292 "accessing the 'result' attribute is deprecated."
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293 " Iterate over the object instead.",
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294 DeprecationWarning, stacklevel=2)
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295 # copied from __iter__, above
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296 return [(tuple(b[v] for v in self.vars)) for b in self.bindings]
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297 else:
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298 raise AttributeError(
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299 "'%s' object has no attribute '%s'" % (self, name))
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300
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301 def __eq__(self, other):
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302 try:
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303 if self.type != other.type:
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304 return False
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305 if self.type == 'ASK':
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306 return self.askAnswer == other.askAnswer
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307 elif self.type == 'SELECT':
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308 return self.vars == other.vars \
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309 and self.bindings == other.bindings
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310 else:
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311 return self.graph == other.graph
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312
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313 except:
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314 return False
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315
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316
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317 class ResultParser(object):
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318
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319 def __init__(self):
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320 pass
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321
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322 def parse(self, source, **kwargs):
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323 """return a Result object"""
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324 pass # abstract
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325
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326
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327 class ResultSerializer(object):
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328
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329 def __init__(self, result):
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330 self.result = result
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331
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332 def serialize(self, stream, encoding="utf-8", **kwargs):
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333 """return a string properly serialized"""
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334 pass # abstract