Method: Sequel::SQL::ComplexExpression#initialize

Defined in:

lib/sequel/sql.rb

#initialize(op, *args) ⇒ ComplexExpression

Set the operator symbol and arguments for this object to the ones given. Convert all args that are hashes or arrays of two element arrays to BooleanExpressions, other than the second arg for an IN/NOT IN operator. Raise an Error if the operator doesn’t allow boolean input and a boolean argument is given. Raise an Error if the wrong number of arguments for a given operator is used.

# File 'lib/sequel/sql.rb', line 219

def initialize(op, *args)
  orig_args = args
  args = args.map{|a| Sequel.condition_specifier?(a) ? SQL::BooleanExpression.from_value_pairs(a) : a}
  case op
  when *N_ARITY_OPERATORS
    raise(Error, "The #{op} operator requires at least 1 argument") unless args.length >= 1
    args.map!{|a| a.is_a?(self.class) && a.op == :NOOP ? a.args.first : a}
    if ASSOCIATIVE_OPERATORS.include?(op)
      old_args = args
      args = []
      old_args.each{|a| a.is_a?(self.class) && a.op == op ? args.concat(a.args) : args.push(a)}
    end
  when *TWO_ARITY_OPERATORS
    raise(Error, "The #{op} operator requires precisely 2 arguments") unless args.length == 2
    # With IN/NOT IN, even if the second argument is an array of two element arrays,
    # don't convert it into a boolean expression, since it's definitely being used
    # as a value list.
    args[1] = orig_args[1] if IN_OPERATORS.include?(op)
  when *ONE_ARITY_OPERATORS
    raise(Error, "The #{op} operator requires a single argument") unless args.length == 1
  when *CUSTOM_EXPRESSIONS
    # nothing
  else
    raise(Error, "Invalid operator #{op}")
  end
  @op = op
  @args = args.freeze
  freeze
end