class SPARQL::Algebra::Operator::StrLen
The SPARQL
`strlen` operator.
@example
(strlen ?x)
@see www.w3.org/TR/sparql11-query/#func-strlen @see www.w3.org/TR/xpath-functions/#func-string-length
Constants
- NAME
Public Instance Methods
apply(operand, **options)
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The strlen function corresponds to the XPath fn:string-length function and returns an xsd:integer equal to the length in characters of the lexical form of the literal.
@example
strlen("chat") 4 strlen("chat"@en) 4 strlen("chat"^^xsd:string) 4
@param [RDF::Literal] operand
the operand
@return [RDF::Literal::Integer] length of string @raise [TypeError] if the operand is not a numeric value
# File lib/sparql/algebra/operator/strlen.rb, line 28 def apply(operand, **options) raise TypeError, "expected a plain RDF::Literal, but got #{operand.inspect}" unless operand.literal? && operand.plain? RDF::Literal(operand.to_s.length) end