Class: DocContract::Handlebars

Inherits:
Object
  • Object
show all
Defined in:
lib/doc_contract/handlebars.rb

Defined Under Namespace

Classes: DummyEscaper

Constant Summary collapse

COMPILE_ATTRIBUTES = 
%w[
  title subtitle
  header-left header-center header-right
  footer-left footer-center footer-right
].freeze

Class Method Summary collapse

Class Method Details

.compile(text, object, process_attributes: true) ⇒ Object

rubocop:enable Metrics/MethodLength



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# File 'lib/doc_contract/handlebars.rb', line 86

def self.compile(text, object, process_attributes: true)
  return '' unless text.present?

  object ||= {}
  if process_attributes
    object.stringify_keys!
    enrich_object(object)
  end
  compiled = renderer.compile(text)
  compiled.call(object)
end

.enrich_object(object) ⇒ Object 



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# File 'lib/doc_contract/handlebars.rb', line 98

def self.enrich_object(object)
  object['today'] = Date.today.iso8601 if object['today'].blank?
  iteration_keys = object.keys
  iteration_keys.each do |k|
    if k =~ /_items$/ and object[k].is_a?(Array)
      amounts_sum = object[k].map{ |o| (o[:amount] || o['amount']).to_f }.sum
      object["#{k}_total"] = amounts_sum
    end
    if COMPILE_ATTRIBUTES.include? k
      #TODO: check self reference, maybe even circular?
      object[k] = compile(object[k], object, process_attributes: false)
    end
  end
  object
end

.renderer ⇒ Object

rubocop:disable Metrics/MethodLength



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# File 'lib/doc_contract/handlebars.rb', line 20

def self.renderer
  return @handlebars_renderer if @handlebars_renderer

  renderer = ::Handlebars::Handlebars.new
  renderer.set_escaper DummyEscaper # Do not escape HTML
  currency_helper = proc do |_context, value, currency_symbol|
    if value.is_a?(Integer) or value.to_i == value
      format("#{currency_symbol} %.0f,-", value) #.gsub(/(\d)(?=\d{3}+,)/, '\1.')
    else
      format("#{currency_symbol} %.2f", value.to_f) #.gsub(/(\d)(?=\d{3}+,)/, '\1.')
    end
  end
  #renderer.register_helper(:euro) do |context, value|
  #  if Integer === value or value.to_i == value
  #    sprintf("€ %.0f,-", value) #.gsub(/(\d)(?=\d{3}+,)/, '\1.')
  #  else
  #    sprintf("€ %.2f", value.to_f) #.gsub(/(\d)(?=\d{3}+,)/, '\1.')
  #  end
  #end
  eval_boolean = proc do |context, values, compare_lambda|
    blocks, comparables = values.partition{ |v| v.is_a? ::Handlebars::Tree::Block }
    true_blk, false_blk = blocks
    comparables = comparables.map{ |v| v.is_a?(Parslet::Slice) ? v.to_s : v }
    are_equal = if compare_lambda.arity == 1
                  compare_lambda.call(comparables)
                else
                  compare_lambda.call(*comparables)
                end
    if true_blk.items.present? # assumed internal helper usecase without blocks
      are_equal ? true_blk.fn(context) : false_blk.try(:fn, context)
    else
      are_equal
    end
  end
  renderer.register_helper(:euro) { |context, value| currency_helper.call context, value, '€' }
  renderer.register_helper(:dollar) { |context, value| currency_helper.call context, value, '$' }
  renderer.register_helper(:peso) { |context, value| currency_helper.call context, value, '$' }
  renderer.register_helper(:plus) { |_context, value, addition, *_rest| value.to_f + addition.to_f }
  renderer.register_helper(:sum)  { |_context, *values, _bkl| (values.first.is_a?(Array) ? values.first : values).map(&:to_f).sum }
  renderer.register_helper(:eq)   { |context, *values| eval_boolean.call context, values, ->(vals){ vals.uniq.length <= 1 } }
  renderer.register_helper(:neq)  { |context, *values| eval_boolean.call context, values, ->(vals){ vals.uniq.length > 1 } }
  renderer.register_helper(:gt)   { |context, *values| eval_boolean.call context, values, ->(a, b){ a > b } }
  renderer.register_helper(:includes) { |context, *values| eval_boolean.call context, values, ->(vals){ vals.first.include? vals.last } }
  renderer.register_helper(:map) do |_context, array, key|
    return [] unless array.present?

    array.map{ |e| e[key.to_s] || e[key.to_sym] }
  end
  renderer.register_helper(:upcase) { |_context, value| value.to_s.upcase }
  renderer.register_helper(:downcase) { |_context, value| value.to_s.downcase }
  renderer.register_helper(:to_sentence) do |_context, array, nester|
    case nester
    when String, Parslet::Slice
      array.map{ |e| e[nester.to_s] || e[nester.to_sym] }.to_sentence
    else
      array.to_sentence
    end
  end
  renderer.register_helper(:to_words) { |_context, value| value.to_words }
  renderer.register_helper(:first_present) do |_context, *args|
    args.find(&:present?)
  end
  @handlebars_renderer = renderer
end