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module SPARQL; module Algebra
class Operator
##
# A SPARQL `strstarts` operator.
#
# @example
# (strstarts ?x ?y)
#
# @see http://www.w3.org/TR/sparql11-query/#func-strstarts
# @see http://www.w3.org/TR/xpath-functions/#func-starts-with
class StrStarts < Operator::Binary
include Evaluatable
NAME = :strstarts
##
# The STRSTARTS function corresponds to the XPath fn:starts-with function. The arguments must be argument compatible otherwise an error is raised.
#
# For such input pairs, the function returns true if the lexical form of arg1 starts with the lexical form of arg2, otherwise it returns false.
#
# @example
# strStarts("foobar", "foo") #=> true
# strStarts("foobar"@en, "foo"@en) #=> true
# strStarts("foobar"^^xsd:string, "foo"^^xsd:string) #=> true
# strStarts("foobar"^^xsd:string, "foo") #=> true
# strStarts("foobar", "foo"^^xsd:string) #=> true
# strStarts("foobar"@en, "foo") #=> true
# strStarts("foobar"@en, "foo"^^xsd:string) #=> true
#
# @param [RDF::Literal] left
# a literal
# @param [RDF::Literal] right
# a literal
# @return [RDF::Literal::Boolean]
# @raise [TypeError] if operands are not compatible
def apply(left, right)
case
when !left.compatible?(right)
raise TypeError, "expected two RDF::Literal operands, but got #{left.inspect} and #{right.inspect}"
when left.to_s.start_with?(right.to_s) then RDF::Literal::TRUE
else RDF::Literal::FALSE
end
end
end # StrStarts
end # Operator
end; end # SPARQL::Algebra
Version data entries
28 entries across 28 versions & 1 rubygems