Class: MARC::Spec::Queries::Operator

Inherits:
TypesafeEnum::Base
  • Object
show all
Defined in:
lib/marc/spec/queries/operator.rb

Overview

NOTE: && and || are not defined in the MARCspec standard but are

implementation details of repeated (AND) and chained (OR) subspecs
-- see https://marcspec.github.io/MARCspec/marc-spec.html#general

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.from_str(op_str) ⇒ Object 



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# File 'lib/marc/spec/queries/operator.rb', line 90

def from_str(op_str)
  Operator.find_by_value(op_str.to_s).tap do |op|
    raise ArgumentError, "No such operator: #{op_str}" unless op
  end
end

Instance Method Details

#binary? ⇒ Boolean

Operator

Returns:

  • (Boolean) 


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# File 'lib/marc/spec/queries/operator.rb', line 100

def binary?
  ![Operator::EXIST, Operator::NEXIST].include?(self)
end

#logical? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/marc/spec/queries/operator.rb', line 104

def logical?
  [Operator::AND, Operator::OR].include?(self)
end

#op_str ⇒ String

Returns:

  • (String) 


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# File 'lib/marc/spec/queries/operator.rb', line 116

def op_str
  # noinspection RubyMismatchedReturnType
  value
end

#to_expression(left, right) ⇒ Object 



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# File 'lib/marc/spec/queries/operator.rb', line 121

def to_expression(left, right)
  return ["(#{left})", self, "(#{right})"].join if logical?

  [left, self, right].join
end

#to_s ⇒ Object

Object overrides



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# File 'lib/marc/spec/queries/operator.rb', line 111

def to_s
  op_str
end