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77 lines
1.6 KiB
Ruby
77 lines
1.6 KiB
Ruby
require 'sass/constant/literal'
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module Sass::Constant
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class Color < Literal
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REGEXP = /\##{"([0-9a-fA-F]{1,2})" * 3}/
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def parse(value)
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@value = value.scan(REGEXP)[0].map { |num| num.ljust(2, 'f').to_i(16) }
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end
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def plus(other)
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if other.is_a? Sass::Constant::String
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Sass::Constant::String.from_value(self.to_s + other.to_s)
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else
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piecewise(other, :+)
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end
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end
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def minus(other)
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if other.is_a? Sass::Constant::String
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raise NoMethodError.new(nil, :minus)
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else
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piecewise(other, :-)
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end
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end
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def times(other)
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if other.is_a? Sass::Constant::String
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raise NoMethodError.new(nil, :times)
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else
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piecewise(other, :*)
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end
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end
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def div(other)
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if other.is_a? Sass::Constant::String
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raise NoMethodError.new(nil, :div)
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else
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piecewise(other, :/)
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end
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end
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def mod(other)
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if other.is_a? Sass::Constant::String
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raise NoMethodError.new(nil, :mod)
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else
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piecewise(other, :%)
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end
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end
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def to_s
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red, green, blue = @value.map { |num| num.to_s(16).rjust(2, '0') }
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"##{red}#{green}#{blue}"
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end
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protected
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def self.filter_value(value)
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value.map { |num| num.to_i }
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end
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private
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def piecewise(other, operation)
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other_num = other.is_a? Number
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other_val = other.value
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rgb = []
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for i in (0...3)
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res = @value[i].send(operation, other_num ? other_val : other_val[i])
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rgb[i] = [ [res, 255].min, 0 ].max
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end
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Color.from_value(rgb)
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end
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end
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end
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