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# frozen_string_literal: true
module Asciidoctor
# A {Converter} implementation that delegates to the chain of {Converter}
# objects passed to the constructor. Selects the first {Converter} that
# identifies itself as the handler for a given transform.
class Converter::CompositeConverter < Converter::Base
# Get the Array of Converter objects in the chain
attr_reader :converters
def initialize backend, *converters, backend_traits_source: nil
@backend = backend
(@converters = converters).each {|converter| converter.composed self if converter.respond_to? :composed }
init_backend_traits backend_traits_source.backend_traits if backend_traits_source
@converter_cache = ::Hash.new {|hash, key| hash[key] = find_converter key }
end
# Public: Delegates to the first converter that identifies itself as the
# handler for the given transform. The optional Hash is passed as the last
# option to the delegate's convert method.
#
# node - the AbstractNode to convert
# transform - the optional String transform, or the name of the node if no
# transform is specified. (default: nil)
# opts - an optional Hash that is passed to the delegate's convert method. (default: nil)
#
# Returns the String result returned from the delegate's convert method
def convert node, transform = nil, opts = nil
(converter_for transform ||= node.node_name).convert node, transform, opts
end
# Public: Retrieve the converter for the specified transform.
#
# Returns the matching [Converter] object
def converter_for transform
@converter_cache[transform]
end
# Public: Find the converter for the specified transform.
# Raise an exception if no converter is found.
#
# Returns the matching [Converter] object
def find_converter transform
@converters.each {|candidate| return candidate if candidate.handles? transform }
raise %(Could not find a converter to handle transform: #{transform})
end
end
end
Version data entries
28 entries across 28 versions & 2 rubygems