Class: Libis::Format::Converter::Chain

Inherits:
Object
  • Object
show all
Includes:
DeepDive, Tools::Logger
Defined in:
lib/libis/format/converter/chain.rb

Instance Method Summary collapse

Constructor Details

#initialize(source_format, target_format, operations = {}) ⇒ Chain

Returns a new instance of Chain.



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# File 'lib/libis/format/converter/chain.rb', line 17

def initialize(source_format, target_format, operations = {})
  @source_format = source_format.to_sym
  @target_format = target_format.to_sym
  @operations = operations || {}
  @converter_chain = []
end

Instance Method Details

#add_chain_node(node = {}) ⇒ Object 



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# File 'lib/libis/format/converter/chain.rb', line 128

def add_chain_node(node = {})
  last_converter = @converter_chain.last
  source_format = last_converter ? last_converter[:output] : @source_format
  node[:input] ||= source_format
  return nil unless node[:input] == source_format
  return nil unless node[:output] && node[:converter].output_types(source_format).include?(node[:output])
  return nil unless node[:converter].input_types.include? source_format
  return nil if node_exists?(node)

  @converter_chain << node
  # debug "Chain: #{self}"
  self
end

#append(converter) ⇒ Array[Hash]

Parameters:

Returns:

  • (Array[Hash]) 


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# File 'lib/libis/format/converter/chain.rb', line 26

def append(converter)
  return [] unless converter

  valid_chain_nodes(converter).map do |node|
    ddup.add_chain_node(node)
  end.compact
end

#apply_operations ⇒ Object 



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# File 'lib/libis/format/converter/chain.rb', line 142

def apply_operations
  temp_chain = @converter_chain.reverse.ddup
  applied = true
  operations = @operations&.ddup || {}
  while (operation = operations.shift)
    method = operation.first.to_s.to_sym
    applied &&= temp_chain.each do |node|
      next unless node[:converter].instance_methods.include?(method)

      node[:operations] ||= []
      node[:operations] << { method:, argument: operation.last }
      break :found
    end == :found
  end
  if applied && operations.empty?
    @converter_chain = temp_chain.reverse
    @operations.clear
    return true
  end
  false
end

#closed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/libis/format/converter/chain.rb', line 34

def closed?
  !@converter_chain.empty? &&
    @converter_chain.first[:input].to_sym == @source_format &&
    @converter_chain.last[:output].to_sym == @target_format
end

#convert(src_file, target_file) ⇒ Object 



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# File 'lib/libis/format/converter/chain.rb', line 59

def convert(src_file, target_file)
  unless valid?
    error 'Converter chain is not valid'
    return nil
  end

  temp_files = []
  xtra_files = []

  result = { commands: [] }

  # noinspection RubyParenthesesAroundConditionInspection
  conversion_success = @converter_chain.each_with_index do |node, i|
    target_type = node[:output]
    converter_class = node[:converter]
    converter = converter_class.new

    node[:operations]&.each do |operation|
      converter.send operation[:method], operation[:argument]
    end

    target = target_file

    if i < size - 1
      target += ".temp.#{TypeDatabase.type_extentions(target_type).first}"
      target += ".#{TypeDatabase.type_extentions(target_type).first}" while File.exist? target
      temp_files << target
    end

    FileUtils.mkdir_p File.dirname(target)

    r = converter.convert(src_file, target, target_type)

    src_file = r[:files].first
    xtra_files += r[:files][1..]
    break :failed unless src_file

    result[:commands] << r.merge(converter: converter_class.name)

    :success
  end

  result[:files] = [src_file] + xtra_files

  temp_files.each do |f|
    FileUtils.rm(f, force: true)
  end

  conversion_success == :failed ? nil : result
end

#size ⇒ Object Also known as: length 



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# File 'lib/libis/format/converter/chain.rb', line 48

def size
  @converter_chain.size
end

#to_array ⇒ Object 



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# File 'lib/libis/format/converter/chain.rb', line 44

def to_array
  @converter_chain
end

#to_s ⇒ Object 



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# File 'lib/libis/format/converter/chain.rb', line 54

def to_s
  result = @source_format.to_s
  result << @converter_chain.map { |node| node_to_s(node) }.join('->-')
end

#valid? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/libis/format/converter/chain.rb', line 40

def valid?
  closed? && apply_operations
end

#valid_chain_nodes(converter) ⇒ Object 



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# File 'lib/libis/format/converter/chain.rb', line 110

def valid_chain_nodes(converter)
  source_format = begin
    @converter_chain.last[:output]
  rescue StandardError
    @source_format
  end
  nodes = []
  if converter.input_types.include? source_format
    converter.output_types(source_format).each do |format|
      node = { converter:, input: source_format, output: format }
      next if node_exists?(node)

      nodes << node
    end
  end
  nodes
end