Class: JSONP3::OpMove

Inherits:
Op
  • Object
show all
Defined in:
lib/json_p3/patch.rb

Overview

The JSON Patch move operation.

Instance Method Summary collapse

Constructor Details

#initialize(from, pointer) ⇒ OpMove

Returns a new instance of OpMove.

Parameters:



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# File 'lib/json_p3/patch.rb', line 175

def initialize(from, pointer)
  super()
  @from = from
  @pointer = pointer
end

Instance Method Details

#apply(value, index) ⇒ Object 



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# File 'lib/json_p3/patch.rb', line 185

def apply(value, index)
  if @pointer.relative_to?(@from)
    raise JSONPatchError,
          "can't move object to one of its children (#{name}:#{index})"
  end

  # Grab the source value.
  source_parent, source_obj = @from.resolve_with_parent(value)
  if source_obj == JSONP3::JSONPointer::UNDEFINED
    raise JSONPatchError,
          "source object does not exist (#{name}:#{index})"
  end

  source_target = @from.tokens.last
  if source_target == JSONP3::JSONPointer::UNDEFINED
    raise JSONPatchError,
          "unexpected operation (#{name}:#{index})"
  end

  # Delete the target value from the source location.
  if source_parent.is_a?(Array)
    source_parent.delete_at(source_target.to_i)
  elsif source_parent.is_a?(Hash)
    source_parent.delete(source_target)
  end

  # Find the parent of the destination pointer.
  dest_parent, _dest_obj = @pointer.resolve_with_parent(value)
  return source_obj if dest_parent == JSONP3::JSONPointer::UNDEFINED

  dest_target = @pointer.tokens.last
  if dest_target == JSONP3::JSONPointer::UNDEFINED
    raise JSONPatchError,
          "unexpected operation (#{name}:#{index})"
  end

  # Write the source value to the destination.
  if dest_parent.is_a?(Array)
    if dest_target == "-"
      dest_parent << source_obj
    else
      dest_parent[dest_target.to_i] = source_obj
    end
  elsif dest_parent.is_a?(Hash)
    dest_parent[dest_target] = source_obj
  end

  value
end

#name ⇒ Object 



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# File 'lib/json_p3/patch.rb', line 181

def name
  "move"
end

#to_h ⇒ Object 



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# File 'lib/json_p3/patch.rb', line 235

def to_h
  { "op" => name, "from" => @from.to_s, "path" => @pointer.to_s }
end