Class: JMESPath::Nodes::MaxFunction Private

Inherits:
Function show all
Includes:
TypeChecker
Defined in:
lib/jmespath/nodes/function.rb

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

Constant Summary

Constants included from TypeChecker

TypeChecker::ARRAY_TYPE, TypeChecker::BOOLEAN_TYPE, TypeChecker::EXPRESSION_TYPE, TypeChecker::NULL_TYPE, TypeChecker::NUMBER_TYPE, TypeChecker::OBJECT_TYPE, TypeChecker::STRING_TYPE, TypeChecker::TYPE_NAMES

Constants inherited from Function

Function::FUNCTIONS

Instance Method Summary collapse

Methods included from TypeChecker

#get_type

Methods inherited from Function

create, #initialize, #optimize, #visit

Methods inherited from Node

#chains_with?, #optimize, #visit

Constructor Details

This class inherits a constructor from JMESPath::Nodes::Function

Instance Method Details

#call(args) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/jmespath/nodes/function.rb', line 230

def call(args)
  if args.count == 1
    values = args.first
  else
    return maybe_raise Errors::InvalidArityError, 'function max() expects one argument'
  end
  if values.respond_to?(:to_ary)
    values = values.to_ary
    return nil if values.empty?
    first = values.first
    first_type = get_type(first)
    unless first_type == NUMBER_TYPE || first_type == STRING_TYPE
      msg = String.new('function max() expects numeric or string values')
      return maybe_raise Errors::InvalidTypeError, msg
    end
    values.inject([first, first_type]) do |(max, max_type), v|
      v_type = get_type(v)
      if max_type == v_type
        v > max ? [v, v_type] : [max, max_type]
      else
        msg = String.new('function max() encountered a type mismatch in sequence: ')
        msg << "#{max_type}, #{v_type}"
        return maybe_raise Errors::InvalidTypeError, msg
      end
    end.first
  else
    return maybe_raise Errors::InvalidTypeError, 'function max() expects an array'
  end
end