Class: Thermal::Db::Device

Inherits:
Object
  • Object
show all
Defined in:
lib/thermal/db/device.rb

Constant Summary collapse

DEFAULT_COL_WIDTH = 
42

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(key, data) ⇒ Device

Returns a new instance of Device.



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# File 'lib/thermal/db/device.rb', line 10

def initialize(key, data)
  @key = key
  @data = data

  # eager load cache
  codepage_index
  charset_index
end

Instance Attribute Details

#key ⇒ Object (readonly)

Returns the value of attribute key.



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# File 'lib/thermal/db/device.rb', line 8

def key
  @key
end

Instance Method Details

#charsets ⇒ Object 



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# File 'lib/thermal/db/device.rb', line 59

def charsets
  @charsets ||= begin
    charsets = @data['charsets'] || ::Thermal::Db::DEFAULT_CHARSETS
    ::Thermal::Util.index_with(charsets) { |i| ::Thermal::Db.charset(i) }.freeze
  end
end

#codepages ⇒ Object

def find_codepage(encoding)

encoding = encoding&.to_s
device.codepages&.invert&.[](encoding) || 0

end



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# File 'lib/thermal/db/device.rb', line 49

def codepages
  @codepages ||= begin
    codepages = @data['codepages'] || ::Thermal::Db::DEFAULT_CODEPAGES
    codepages.each_with_object({}) do |(k, v), h|
      encoding = ::Thermal::Db.encoding(v)
      h[k] = encoding if encoding
    end.freeze
  end
end

#col_width ⇒ Object

TODO: this needs to be dynamic in the printer



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# File 'lib/thermal/db/device.rb', line 32

def col_width
  @col_width ||= @data.dig('fonts', 0, 'columns') || DEFAULT_COL_WIDTH
end

#find_encoding(u_codepoint) ⇒ Object 



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# File 'lib/thermal/db/device.rb', line 36

def find_encoding(u_codepoint)
  if (codepage = codepage_index[u_codepoint])
    [:codepage, codepage].freeze
  elsif (charset = charset_index[u_codepoint]) && charset > 0
    [:charset, charset].freeze
  end
end

#format ⇒ Object 



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# File 'lib/thermal/db/device.rb', line 23

def format
  @data['format']&.to_s
end

#name ⇒ Object 



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# File 'lib/thermal/db/device.rb', line 19

def name
  @data['name']&.to_s
end

#supports?(feature) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/thermal/db/device.rb', line 27

def supports?(feature)
  !!@data.dig('features', feature)
end