Class: Abachrome::Parsers::Hex

Inherits:
Object
  • Object
show all
Defined in:
lib/abachrome/parsers/hex.rb

Constant Summary collapse

HEX_PATTERN = 
/^#?([0-9A-Fa-f]{3}|[0-9A-Fa-f]{6}|[0-9A-Fa-f]{4}|[0-9A-Fa-f]{8})$/

Class Method Summary collapse

Class Method Details

.parse(input) ⇒ Object 



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# File 'lib/abachrome/parsers/hex.rb', line 8

def self.parse(input)
  hex = input.gsub(/^#/, "")
  return nil unless hex.match?(HEX_PATTERN)

  case hex.length
  when 3
    parse_short_hex(hex)
  when 4
    parse_short_hex_with_alpha(hex)
  when 6
    parse_full_hex(hex)
  when 8
    parse_full_hex_with_alpha(hex)
  end
end

.parse_full_hex(hex) ⇒ Object 



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# File 'lib/abachrome/parsers/hex.rb', line 34

def self.parse_full_hex(hex)
  r = hex[0, 2].to_i(16)
  g = hex[2, 2].to_i(16)
  b = hex[4, 2].to_i(16)
  Color.from_rgb(r / 255.0, g / 255.0, b / 255.0)
end

.parse_full_hex_with_alpha(hex) ⇒ Object 



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# File 'lib/abachrome/parsers/hex.rb', line 41

def self.parse_full_hex_with_alpha(hex)
  r = hex[0, 2].to_i(16)
  g = hex[2, 2].to_i(16)
  b = hex[4, 2].to_i(16)
  a = hex[6, 2].to_i(16)
  Color.from_rgb(r / 255.0, g / 255.0, b / 255.0, a / 255.0)
end

.parse_short_hex(hex) ⇒ Object 



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# File 'lib/abachrome/parsers/hex.rb', line 24

def self.parse_short_hex(hex)
  r, g, b = hex.chars.map { |c| (c + c).to_i(16) }
  Color.from_rgb(r / 255.0, g / 255.0, b / 255.0)
end

.parse_short_hex_with_alpha(hex) ⇒ Object 



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# File 'lib/abachrome/parsers/hex.rb', line 29

def self.parse_short_hex_with_alpha(hex)
  r, g, b, a = hex.chars.map { |c| (c + c).to_i(16) }
  Color.from_rgb(r / 255.0, g / 255.0, b / 255.0, a / 255.0)
end