Class: JSONP3::OpCopy

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

Overview

The JSON Patch copy operation.

Instance Method Summary collapse

Constructor Details

#initialize(from, pointer) ⇒ OpCopy

Returns a new instance of OpCopy.

Parameters:



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# File 'lib/json_p3/patch.rb', line 244

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 254

def apply(value, index)
  # 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

  # Find the parent of the destination pointer.
  dest_parent, _dest_obj = @pointer.resolve_with_parent(value)
  return deep_copy(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.insert(dest_target.to_i, deep_copy(source_obj))
    end
  elsif dest_parent.is_a?(Hash)
    dest_parent[dest_target] = deep_copy(source_obj)
  else
    raise JSONPatchError, "unexpected operation on #{dest_parent.class} (#{name}:#{index})"
  end

  value
end

#name ⇒ Object 



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# File 'lib/json_p3/patch.rb', line 250

def name
  "copy"
end

#to_h ⇒ Object 



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# File 'lib/json_p3/patch.rb', line 288

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