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# frozen_string_literal: true
require_relative 'extension'
module Puppet::Pops
module Serialization
# The serializer is capable of writing, arrays, maps, and complex objects using an underlying protocol writer. It takes care of
# tabulating and disassembling complex objects.
# @api public
class Serializer
# Provides access to the writer.
# @api private
attr_reader :writer
# @param writer [AbstractWriter] the writer that is used for writing primitive values
# @param options [{String, Object}] serialization options
# @option options [Boolean] :type_by_reference `true` if Object types are serialized by name only.
# @api public
def initialize(writer, options = EMPTY_HASH)
# Hash#compare_by_identity is intentionally not used since we only need to map
# object ids to their size and we don't want to store entire objects in memory
@written = {}
@writer = writer
@options = options
end
# Tell the underlying writer to finish
# @api public
def finish
@writer.finish
end
# Write an object
# @param [Object] value the object to write
# @api public
def write(value)
case value
when Integer, Float, String, true, false, nil
@writer.write(value)
when :default
@writer.write(Extension::Default::INSTANCE)
else
index = @written[value.object_id] # rubocop:disable Lint/HashCompareByIdentity
if index.nil?
write_tabulated_first_time(value)
else
@writer.write(Extension::Tabulation.new(index))
end
end
end
# Write the start of an array.
# @param [Integer] size the size of the array
# @api private
def start_array(size)
@writer.write(Extension::ArrayStart.new(size))
end
# Write the start of a map (hash).
# @param [Integer] size the number of entries in the map
# @api private
def start_map(size)
@writer.write(Extension::MapStart.new(size))
end
# Write the start of a complex pcore object
# @param [String] type_ref the name of the type
# @param [Integer] attr_count the number of attributes in the object
# @api private
def start_pcore_object(type_ref, attr_count)
@writer.write(Extension::PcoreObjectStart.new(type_ref, attr_count))
end
# Write the start of a complex object
# @param [Integer] attr_count the number of attributes in the object
# @api private
def start_object(attr_count)
@writer.write(Extension::ObjectStart.new(attr_count))
end
def push_written(value)
@written[value.object_id] = @written.size # rubocop:disable Lint/HashCompareByIdentity
end
# Write the start of a sensitive object
# @api private
def start_sensitive
@writer.write(Extension::SensitiveStart::INSTANCE)
end
def type_by_reference?
@options[:type_by_reference] == true
end
def to_s
"#{self.class.name} with #{@writer}"
end
def inspect
to_s
end
# First time write of a tabulated object. This means that the object is written and then remembered. Subsequent writes
# of the same object will yield a write of a tabulation index instead.
# @param [Object] value the value to write
# @api private
def write_tabulated_first_time(value)
if value.instance_of?(Symbol) ||
value.instance_of?(Regexp) ||
value.instance_of?(SemanticPuppet::Version) ||
value.instance_of?(SemanticPuppet::VersionRange) ||
value.instance_of?(Time::Timestamp) ||
value.instance_of?(Time::Timespan) ||
value.instance_of?(Types::PBinaryType::Binary) ||
value.is_a?(URI)
push_written(value)
@writer.write(value)
elsif value.instance_of?(Array)
push_written(value)
start_array(value.size)
value.each { |elem| write(elem) }
elsif value.instance_of?(Hash)
push_written(value)
start_map(value.size)
value.each_pair { |key, val| write(key); write(val) }
elsif value.instance_of?(Types::PSensitiveType::Sensitive)
start_sensitive
write(value.unwrap)
elsif value.instance_of?(Types::PTypeReferenceType)
push_written(value)
@writer.write(value)
elsif value.is_a?(Types::PuppetObject)
value._pcore_type.write(value, self)
else
impl_class = value.class
type = Loaders.implementation_registry.type_for_module(impl_class)
raise SerializationError, _("No Puppet Type found for %{klass}") % { klass: impl_class.name } unless type.is_a?(Types::PObjectType)
type.write(value, self)
end
end
end
end
end
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