Class: Tataru::Flattener

Inherits:
Object
  • Object
show all
Defined in:
lib/tataru/flattener.rb

Overview

flattens properties to make them digestable

Instance Method Summary collapse

Constructor Details

#initialize(value) ⇒ Flattener

Returns a new instance of Flattener.



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# File 'lib/tataru/flattener.rb', line 6

def initialize(value)
  @value = value
  @result = {}
end

Instance Method Details

#flatten(value, name) ⇒ Object 



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# File 'lib/tataru/flattener.rb', line 16

def flatten(value, name)
  type = value.class.name
              .sub(/^Tataru::Representations::/, '')
              .sub(/Representation$/, '')
              .downcase
  method_name = :"flatten_#{type}"
  raise "cannot flatten #{value.inspect}" unless respond_to?(method_name)

  send(method_name, value, name)
end

#flatten_array(value, name) ⇒ Object 



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# File 'lib/tataru/flattener.rb', line 34

def flatten_array(value, name)
  refs = {}
  value.value.each_with_index do |val, i|
    key = :"#{name}_#{i}"
    flatten(val, key)
    refs[i] = key
  end
  @result[name] = {
    type: :array,
    references: refs
  }
end

#flatten_hash(value, name) ⇒ Object 



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# File 'lib/tataru/flattener.rb', line 47

def flatten_hash(value, name)
  refs = {}
  value.value.each do |k, v|
    key = :"#{name}_#{k}"
    flatten(v, key)
    refs[k] = key
  end
  @result[name] = {
    type: :hash,
    references: refs
  }
end

#flatten_literal(value, name) ⇒ Object 



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# File 'lib/tataru/flattener.rb', line 27

def flatten_literal(value, name)
  @result[name] = {
    type: :literal,
    value: value.value
  }
end

#flatten_output(value, name) ⇒ Object 



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# File 'lib/tataru/flattener.rb', line 73

def flatten_output(value, name)
  @result[name] = {
    type: :output,
    resource: value.resource_name,
    output: value.output_field_name
  }
end

#flatten_resource(value, name) ⇒ Object 



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# File 'lib/tataru/flattener.rb', line 60

def flatten_resource(value, name)
  refs = {}
  value.properties.each do |k, v|
    key = :"#{name}_#{k}"
    flatten(v, key)
    refs[k] = key
  end
  @result[name] = {
    type: :hash,
    references: refs
  }
end

#flattened ⇒ Object 



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# File 'lib/tataru/flattener.rb', line 11

def flattened
  flatten(@value, :top)
  @result
end