Class: Eco::Data::Mapper

Inherits:
Object show all
Defined in:
lib/eco/data/mapper.rb

Instance Method Summary collapse

Constructor Details

#initialize(array_of_arrays = [], internal: :last, insensitive: false) ⇒ Mapper

it expects [[v1a, v1b], [v2a, v2b] ...]



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# File 'lib/eco/data/mapper.rb', line 5

def initialize (array_of_arrays = [], internal: :last, insensitive: false)
  @internal_order = internal
  @source         = array_of_arrays
  @insensitive    = insensitive

  return unless @source

  # internal should be always last in @source
  @source = @source.map(&:reverse) unless internal == :last

  # first declarations take priority
  @by_external = @source.reverse.to_h.tap do |h_data|
    next unless insensitive?

    h_data.dup.each do |key, value|
      next if h_data.key?(key.downcase)

      h_data[key.downcase] = value
    end
  end

  @by_internal = @source.reverse.map(&:reverse).to_h.tap do |h_data|
    next unless insensitive?

    h_data.dup.each do |key, value|
      next if h_data.key?(key.downcase)

      h_data[key.downcase] = value
    end
  end
end

Instance Method Details

#+(array_of_arrays) ⇒ Object 



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# File 'lib/eco/data/mapper.rb', line 60

def +(array_of_arrays)
  self.class.new(array_of_arrays + to_a, internal: @internal_order)
end

#as_json(internal: @internal_order) ⇒ Object 



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# File 'lib/eco/data/mapper.rb', line 41

def as_json(internal: @internal_order)
  to_a(internal: internal)
end

#external?(value) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/eco/data/mapper.rb', line 79

def external?(value)
  return true unless @source

  value = value.downcase if insensitive?
  @by_external.key?(value)
end

#include?(value) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/eco/data/mapper.rb', line 86

def include?(value)
  return true unless @source

  internal?(value) || external?(value)
end

#insensitive? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/eco/data/mapper.rb', line 37

def insensitive?
  @insensitive
end

#internal?(value) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/eco/data/mapper.rb', line 72

def internal?(value)
  return true         unless @source

  value = value.downcase if insensitive?
  @by_internal.key?(value)
end

#list(type = :internal) ⇒ Object 



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# File 'lib/eco/data/mapper.rb', line 64

def list(type = :internal)
  return [] unless @source

  @source.map do |pair|
    type == :internal ? pair.last : pair.first
  end.uniq
end

#self_mapped?(value) ⇒ Boolean

Whether value maps to itself

Returns:

  • (Boolean) 


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# File 'lib/eco/data/mapper.rb', line 93

def self_mapped?(value)
  return false unless include?(value)

  value == to_internal(value)
end

#to_a(internal: @internal_order) ⇒ Object 



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# File 'lib/eco/data/mapper.rb', line 53

def to_a(internal: @internal_order)
  src_dup = @source.map {|pair| pair[0..]}
  return src_dup if internal == :last

  src_dup.map(&:reverse)
end

#to_external(value) ⇒ Object 



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# File 'lib/eco/data/mapper.rb', line 106

def to_external(value)
  return value unless @source

  value = value.downcase if insensitive?
  @by_internal[value]
end

#to_internal(value) ⇒ Object 



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# File 'lib/eco/data/mapper.rb', line 99

def to_internal(value)
  return value unless @source

  value = value.downcase if insensitive?
  @by_external[value]
end

#to_json(internal: @internal_order) ⇒ Object 



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# File 'lib/eco/data/mapper.rb', line 45

def to_json(internal: @internal_order)
  content = as_json(internal: internal).map do |pair|
    "  " + pair.to_json
  end.join(",\n")

  "[\n#{content}\n]"
end