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Contents
require 'uri'
module SPARQL; module Algebra
class Operator
##
# The SPARQL logical `abs` operator.
#
# [121] BuiltInCall ::= ... | 'ENCODE_FOR_URI' '(' Expression ')'
#
# @example SPARQL Grammar
# PREFIX : <http://example.org/>
# SELECT ?s ?str (ENCODE_FOR_URI(?str) AS ?encoded) WHERE {
# ?s :str ?str
# }
#
# @example SSE
# (prefix ((: <http://example.org/>))
# (project (?s ?str ?encoded)
# (extend ((?encoded (encode_for_uri ?str)))
# (bgp (triple ?s :str ?str)))))
#
# @see https://www.w3.org/TR/sparql11-query/#func-encode
# @see https://www.w3.org/TR/xpath-functions/#func-abs
class EncodeForURI < Operator::Unary
include Evaluatable
NAME = :encode_for_uri
##
# The `ENCODE_FOR_URI` function corresponds to the XPath fn:encode-for-uri function. It returns a simple literal with the lexical form obtained from the lexical form of its input after translating reserved characters according to the fn:encode-for-uri function.
#
# @example
# encode_for_uri("Los Angeles") "Los%20Angeles"
# encode_for_uri("Los Angeles"@en) "Los%20Angeles"
# encode_for_uri("Los Angeles"^^xsd:string) "Los%20Angeles"
#
# @param [RDF::Literal] operand
# the operand
# @return [RDF::Literal] literal of same type
# @raise [TypeError] if the operand is not a literal value
def apply(operand, **options)
case operand
when RDF::Literal then RDF::Literal(CGI.escape(operand.to_s))
else raise TypeError, "expected an RDF::Literal, but got #{operand.inspect}"
end
end
##
#
# Returns a partial SPARQL grammar for this operator.
#
# @return [String]
def to_sparql(**options)
"ENCODE_FOR_URI(#{operands.last.to_sparql(**options)})"
end
end # EncodeForURI
end # Operator
end; end # SPARQL::Algebra
Version data entries
7 entries across 7 versions & 1 rubygems