Class: JMESPath::Nodes::KeysFunction Private

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

Overview

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.

API:

  • private

Constant Summary

Constants inherited from Function

Function::FUNCTIONS

Instance Method Summary collapse

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.

API:

  • private



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# File 'lib/jmespath/nodes/function.rb', line 318

def call(args)
  if args.count == 1
    value = args.first
    if value.respond_to?(:to_hash)
      value.to_hash.keys.map(&:to_s)
    elsif value.is_a?(Struct)
      value.members.map(&:to_s)
    else
      return maybe_raise Errors::InvalidTypeError, "function keys() expects a hash"
    end
  else
    return maybe_raise Errors::InvalidArityError, "function keys() expects one argument"
  end
end