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

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400 (2020-07-31)
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1
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2 from types import MethodType
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3
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4 from rdflib.plugins.sparql.compat import OrderedDict
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5
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6 from pyparsing import TokenConverter, ParseResults
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7
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8 from rdflib import BNode, Variable, URIRef
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9
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10 DEBUG = True
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11 DEBUG = False
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12 if DEBUG:
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13 import traceback
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14
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15 """
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16
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17 NOTE: PyParsing setResultName/__call__ provides a very similar solution to this
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18 I didn't realise at the time of writing and I will remove a
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19 lot of this code at some point
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20
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21 Utility classes for creating an abstract-syntax tree out with pyparsing actions
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22
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23 Lets you label and group parts of parser production rules
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24
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25 For example:
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26
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27 # [5] BaseDecl ::= 'BASE' IRIREF
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28 BaseDecl = Comp('Base', Keyword('BASE') + Param('iri',IRIREF))
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29
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30 After parsing, this gives you back an CompValue object,
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31 which is a dict/object with the paramters specified.
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32 So you can access the parameters are attributes or as keys:
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33
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34 baseDecl.iri
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35
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36 Comp lets you set an evalFn that is bound to the eval method of
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37 the resulting CompValue
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39
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40 """
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41
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42
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43 # This is an alternative
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44
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45 # Comp('Sum')( Param('x')(Number) + '+' + Param('y')(Number) )
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46
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47 def value(ctx, val, variables=False, errors=False):
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48
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49 """
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50 utility function for evaluating something...
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51
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52 Variables will be looked up in the context
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53 Normally, non-bound vars is an error,
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54 set variables=True to return unbound vars
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55
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56 Normally, an error raises the error,
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57 set errors=True to return error
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58
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59 """
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60
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61 if isinstance(val, Expr):
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62 return val.eval(ctx) # recurse?
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63 elif isinstance(val, CompValue):
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64 raise Exception("What do I do with this CompValue? %s" % val)
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65
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66 elif isinstance(val, list):
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67 return [value(ctx, x, variables, errors) for x in val]
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68
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69 elif isinstance(val, (BNode, Variable)):
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70 r = ctx.get(val)
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71 if isinstance(r, SPARQLError) and not errors:
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72 raise r
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73 if r is not None:
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74 return r
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75
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76 # not bound
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77 if variables:
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78 return val
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79 else:
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80 raise NotBoundError
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81
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82 elif isinstance(val, ParseResults) and len(val) == 1:
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83 return value(ctx, val[0], variables, errors)
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84 else:
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85 return val
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86
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87
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88 class ParamValue(object):
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89 """
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90 The result of parsing a Param
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91 This just keeps the name/value
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92 All cleverness is in the CompValue
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93 """
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94 def __init__(self, name, tokenList, isList):
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95 self.isList = isList
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96 self.name = name
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97 if isinstance(tokenList, (list, ParseResults)) and len(tokenList) == 1:
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98 tokenList = tokenList[0]
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99
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100 self.tokenList = tokenList
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101
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102 def __str__(self):
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103 return "Param(%s, %s)" % (self.name, self.tokenList)
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104
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105
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106 class Param(TokenConverter):
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107 """
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108 A pyparsing token for labelling a part of the parse-tree
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109 if isList is true repeat occurrences of ParamList have
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110 their values merged in a list
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111 """
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112 def __init__(self, name, expr, isList=False):
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113 self.name = name
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114 self.isList = isList
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115 TokenConverter.__init__(self, expr)
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116 self.addParseAction(self.postParse2)
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117
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118 def postParse2(self, tokenList):
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119 return ParamValue(self.name, tokenList, self.isList)
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120
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121
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122 class ParamList(Param):
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123 """
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124 A shortcut for a Param with isList=True
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125 """
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126 def __init__(self, name, expr):
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127 Param.__init__(self, name, expr, True)
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128
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129
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130 class plist(list):
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131 """this is just a list, but we want our own type to check for"""
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132
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133 pass
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134
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135
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136 class CompValue(OrderedDict):
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137
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138 """
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139 The result of parsing a Comp
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140 Any included Params are avaiable as Dict keys
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141 or as attributes
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142
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143 """
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144
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145 def __init__(self, name, **values):
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146 OrderedDict.__init__(self)
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147 self.name = name
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148 self.update(values)
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149
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150 def clone(self):
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151 return CompValue(self.name, **self)
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152
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153 def __str__(self):
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154 return self.name + "_" + OrderedDict.__str__(self)
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155
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156 def __repr__(self):
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157 return self.name + "_" + dict.__repr__(self)
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158
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159 def _value(self, val, variables=False, errors=False):
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160 if self.ctx is not None:
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161 return value(self.ctx, val, variables)
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162 else:
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163 return val
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164
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165 def __getitem__(self, a):
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166 return self._value(OrderedDict.__getitem__(self, a))
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167
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168 def get(self, a, variables=False, errors=False):
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169 return self._value(OrderedDict.get(self, a, a), variables, errors)
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170
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171 def __getattr__(self, a):
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172 # Hack hack: OrderedDict relies on this
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173 if a in ('_OrderedDict__root', '_OrderedDict__end'):
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174 raise AttributeError
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175 try:
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176 return self[a]
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177 except KeyError:
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178 # raise AttributeError('no such attribute '+a)
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179 return None
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180
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181
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182 class Expr(CompValue):
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183 """
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184 A CompValue that is evaluatable
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185 """
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186
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187 def __init__(self, name, evalfn=None, **values):
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188 super(Expr, self).__init__(name, **values)
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189
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190 self._evalfn = None
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191 if evalfn:
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192 self._evalfn = MethodType(evalfn, self)
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193
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194 def eval(self, ctx={}):
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195 try:
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196 self.ctx = ctx
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197 return self._evalfn(ctx)
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198 except SPARQLError as e:
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199 return e
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200 finally:
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201 self.ctx = None
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202
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203
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204 class Comp(TokenConverter):
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205
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206 """
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207 A pyparsing token for grouping together things with a label
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208 Any sub-tokens that are not Params will be ignored.
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209
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210 Returns CompValue / Expr objects - depending on whether evalFn is set.
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211 """
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212
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213 def __init__(self, name, expr):
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214 TokenConverter.__init__(self, expr)
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215 self.name = name
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216 self.evalfn = None
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217
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218 def postParse(self, instring, loc, tokenList):
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219
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220 if self.evalfn:
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221 res = Expr(self.name)
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222 res._evalfn = MethodType(self.evalfn, res)
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223 else:
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224 res = CompValue(self.name)
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225
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226 for t in tokenList:
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227 if isinstance(t, ParamValue):
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228 if t.isList:
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229 if not t.name in res:
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230 res[t.name] = plist()
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231 res[t.name].append(t.tokenList)
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232 else:
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233 res[t.name] = t.tokenList
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234 # res.append(t.tokenList)
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235 # if isinstance(t,CompValue):
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236 # res.update(t)
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237 return res
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238
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239 def setEvalFn(self, evalfn):
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240 self.evalfn = evalfn
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241 return self
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242
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243
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244 def prettify_parsetree(t, indent='', depth=0):
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245 out = []
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246 if isinstance(t, ParseResults):
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247 for e in t.asList():
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248 out.append(prettify_parsetree(e, indent, depth + 1))
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249 for k, v in sorted(t.items()):
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250 out.append("%s%s- %s:\n" % (indent, ' ' * depth, k))
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251 out.append(prettify_parsetree(v, indent, depth + 1))
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252 elif isinstance(t, CompValue):
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253 out.append("%s%s> %s:\n" % (indent, ' ' * depth, t.name))
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254 for k, v in list(t.items()):
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255 out.append("%s%s- %s:\n" % (indent, ' ' * (depth + 1), k))
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256 out.append(prettify_parsetree(v, indent, depth + 2))
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257 elif isinstance(t, dict):
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258 for k, v in list(t.items()):
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259 out.append("%s%s- %s:\n" % (indent, ' ' * (depth + 1), k))
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260 out.append(prettify_parsetree(v, indent, depth + 2))
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261 elif isinstance(t, list):
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262 for e in t:
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263 out.append(prettify_parsetree(e, indent, depth + 1))
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264 else:
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265 out.append("%s%s- %r\n" % (indent, ' ' * depth, t))
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266 return "".join(out)
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267
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268
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269 if __name__ == '__main__':
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270 from pyparsing import Word, nums
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271 import sys
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272
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273 Number = Word(nums)
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274 Number.setParseAction(lambda x: int(x[0]))
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275 Plus = Comp('plus', Param('a', Number) + '+' + Param('b', Number))
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276 Plus.setEvalFn(lambda self, ctx: self.a + self.b)
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277
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278 r = Plus.parseString(sys.argv[1])
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279 print(r)
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280 print(r[0].eval({}))
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281
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282 # hurrah for circular imports
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283 from rdflib.plugins.sparql.sparql import SPARQLError, NotBoundError