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Contents
module SPARQL; module Algebra
class Operator
##
# The SPARQL logical `lcase` operator.
#
# [121] BuiltInCall ::= ... | 'LCASE' '(' Expression ')'
#
# @example SPARQL Grammar
# PREFIX : <http://example.org/>
# SELECT ?s (LCASE(?str) AS ?lstr) WHERE {
# ?s :str ?str
# }
#
# @example SSE
# (prefix ((: <http://example.org/>))
# (project (?s ?lstr)
# (extend ((?lstr (lcase ?str)))
# (bgp (triple ?s :str ?str)))))
#
# @see https://www.w3.org/TR/sparql11-query/#func-lcase
# @see https://www.w3.org/TR/xpath-functions/#func-lcase
class LCase < Operator::Unary
include Evaluatable
NAME = :lcase
##
# The LCASE function corresponds to the XPath fn:lower-case function. It returns a string literal whose lexical form is the lower case of the lexcial form of the argument.
#
# @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(operand.to_s.downcase, datatype: operand.datatype, language: operand.language)
else raise TypeError, "expected an RDF::Literal::Numeric, but got #{operand.inspect}"
end
end
##
#
# Returns a partial SPARQL grammar for this operator.
#
# @return [String]
def to_sparql(**options)
"LCASE(" + operands.last.to_sparql(**options) + ")"
end
end # LCase
end # Operator
end; end # SPARQL::Algebra
Version data entries
7 entries across 7 versions & 1 rubygems