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# frozen_string_literal: true
# A SassScript object representing a CSS color.
# This class provides a very bare-bones system for storing a RGB(A) or HSL(A)
# color and converting it to a CSS color function.
#
# If your Sass method accepts a color you will need to perform any
# needed color mathematics or transformations yourself.
class SassC::Script::Value::Color < SassC::Script::Value
attr_reader :red
attr_reader :green
attr_reader :blue
attr_reader :hue
attr_reader :saturation
attr_reader :lightness
attr_reader :alpha
# Creates a new color with (`red`, `green`, `blue`) or (`hue`, `saturation`, `lightness`
# values, plus an optional `alpha` transparency value.
def initialize(red:nil, green:nil, blue:nil, hue:nil, saturation:nil, lightness:nil, alpha:1.0)
if red && green && blue && alpha
@mode = :rgba
@red = SassC::Util.clamp(red.to_i, 0, 255)
@green = SassC::Util.clamp(green.to_i, 0, 255)
@blue = SassC::Util.clamp(blue.to_i, 0, 255)
@alpha = SassC::Util.clamp(alpha.to_f, 0.0, 1.0)
elsif hue && saturation && lightness && alpha
@mode = :hsla
@hue = SassC::Util.clamp(hue.to_i, 0, 360)
@saturation = SassC::Util.clamp(saturation.to_i, 0, 100)
@lightness = SassC::Util.clamp(lightness.to_i, 0, 100)
@alpha = SassC::Util.clamp(alpha.to_f, 0.0, 1.0)
else
raise SassC::UnsupportedValue, "Unable to determine color configuration for "
end
end
# Returns a CSS color declaration in the form
# `rgb(…)`, `rgba(…)`, `hsl(…)`, or `hsla(…)`.
def to_s
if rgba? && @alpha == 1.0
return "rgb(#{@red}, #{@green}, #{@blue})"
elsif rgba?
return "rgba(#{@red}, #{@green}, #{@blue}, #{alpha_string})"
elsif hsla? && @alpha == 1.0
return "hsl(#{@hue}, #{@saturation}%, #{@lightness}%)"
else # hsla?
return "hsla(#{@hue}, #{@saturation}%, #{@lightness}%, #{alpha_string})"
end
end
# True if this color has RGBA values
def rgba?
@mode == :rgba
end
# True if this color has HSLA values
def hlsa?
@mode == :hlsa
end
# Returns the alpha value of this color as a string
# and rounded to 8 decimal places.
def alpha_string
alpha.round(8).to_s
end
# Returns the values of this color in an array.
# Provided for compatibility between different SassC::Script::Value classes
def value
return [
red, green, blue,
hue, saturation, lightness,
alpha,
].compact
end
# True if this Color is equal to `other_color`
def eql?(other_color)
unless other_color.is_a?(self.class)
raise ArgumentError, "No implicit conversion of #{other_color.class} to #{self.class}"
end
self.value == other_color.value
end
alias_method :==, :eql?
# Returns a numeric value for comparing two Color objects
# This method is used internally by the Hash class and is not the same as `.to_h`
def hash
value.hash
end
end
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