Module: Sass::Script::Functions

Defined in:
lib/sass/script/functions.rb

Overview

Methods in this module are accessible from the SassScript context. For example, you can write

$color = hsl(120deg, 100%, 50%)

and it will call #hsl.

The following functions are provided:

RGB Functions

#rgb : Converts an rgb(red, green, blue) triplet into a color.

#rgba : Converts an rgba(red, green, blue, alpha) quadruplet into a color.

#red : Gets the red component of a color.

#green : Gets the green component of a color.

#blue : Gets the blue component of a color.

#mix : Mixes two colors together.

HSL Functions

#hsl : Converts an hsl(hue, saturation, lightness) triplet into a color.

#hsla : Converts an hsla(hue, saturation, lightness, alpha) quadruplet into a color.

#hue : Gets the hue component of a color.

#saturation : Gets the saturation component of a color.

#lightness : Gets the lightness component of a color.

#adjust-hue : Changes the hue of a color.

#lighten : Makes a color lighter.

#darken : Makes a color darker.

#saturate : Makes a color more saturated.

#desaturate : Makes a color less saturated.

#grayscale : Converts a color to grayscale.

#complement : Returns the complement of a color.

Opacity Functions

#alpha / #opacity : Gets the alpha component (opacity) of a color.

#rgba : Sets the alpha component of a color.

#opacify / #fade-in : Makes a color more opaque.

#transparentize / #fade-out : Makes a color more transparent.

String Functions

#unquote : Removes the quotes from a string.

#quote : Adds quotes to a string.

Number Functions

#percentage : Converts a unitless number to a percentage.

#round : Rounds a number to the nearest whole number.

#ceil : Rounds a number up to the nearest whole number.

#floor : Rounds a number down to the nearest whole number.

#abs : Returns the absolute value of a number.

Introspection Functions

#type_of : Returns the type of a value.

#unit : Returns the units associated with a number.

#unitless : Returns whether a number has units or not.

#comparable : Returns whether two numbers can be added or compared.

These functions are described in more detail below.

Adding Custom Functions

New Sass functions can be added by adding Ruby methods to this module. For example:

module Sass::Script::Functions
  def reverse(string)
    assert_type string, :String
    Sass::Script::String.new(string.value.reverse)
  end
end

There are a few things to keep in mind when modifying this module. First of all, the arguments passed are Literal objects. Literal objects are also expected to be returned. This means that Ruby values must be unwrapped and wrapped.

Most Literal objects support the value accessor for getting their Ruby values. Color objects, though, must be accessed using rgb, red, green, or blue.

Second, making Ruby functions accessible from Sass introduces the temptation to do things like database access within stylesheets. This is generally a bad idea; since Sass files are by default only compiled once, dynamic code is not a great fit.

If you really, really need to compile Sass on each request, first make sure you have adequate caching set up. Then you can use Engine to render the code, using the options parameter to pass in data that can be accessed from your Sass functions.

Within one of the functions in this module, methods of EvaluationContext can be used.

Caveats

When creating new Literal objects within functions, be aware that it's not safe to call #to_s (or other methods that use the string representation) on those objects without first setting the #options attribute.

Defined Under Namespace

Classes: EvaluationContext

Instance Method Summary collapse

Instance Method Details

#abs(value) ⇒ Number

Finds the absolute value of a number. For example:

abs(10px) => 10px
abs(-10px) => 10px

Parameters:

  • value (Number) —

    The number

Returns:

  • (Number) —

    The absolute value

Raises:



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# File 'lib/sass/script/functions.rb', line 833

def abs(value)
  numeric_transformation(value) {|n| n.abs}
end

#adjust_hue(color, degrees) ⇒ Color

Changes the hue of a color while retaining the lightness and saturation. Takes a color and a number of degrees (usually between -360deg and 360deg), and returns a color with the hue rotated by that value.

For example:

adjust-hue(hsl(120, 30%, 90%), 60deg) => hsl(180, 30%, 90%)
adjust-hue(hsl(120, 30%, 90%), 060deg) => hsl(60, 30%, 90%)
adjust-hue(#811, 45deg) => #886a11

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    If color isn't a color, or number isn't a number



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# File 'lib/sass/script/functions.rb', line 581

def adjust_hue(color, degrees)
  assert_type color, :Color
  assert_type degrees, :Number
  color.with(:hue => color.hue + degrees.value)
end

#alpha(color) ⇒ Number

Returns the alpha component (opacity) of a color. This is 1 unless otherwise specified.

This function also supports the proprietary Microsoft alpha(opacity=20) syntax.

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    If color isn't a color

See Also:



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# File 'lib/sass/script/functions.rb', line 426

def alpha(*args)
  if args.all? do |a|
      a.is_a?(Sass::Script::String) && a.type == :identifier &&
        a.value =~ /^[a-zA-Z]+\s*=/
    end
    # Support the proprietary MS alpha() function
    return Sass::Script::String.new("alpha(#{args.map {|a| a.to_s}.join(", ")})")
  end

  opacity(*args)
end

#blue(color) ⇒ Number

Returns the blue component of a color.

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    If color isn't a color



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# File 'lib/sass/script/functions.rb', line 362

def blue(color)
  assert_type color, :Color
  Sass::Script::Number.new(color.blue)
end

#ceil(value) ⇒ Number

Rounds a number up to the nearest whole number. For example:

ciel(10.4px) => 11px
ciel(10.6px) => 11px

Parameters:

  • value (Number) —

    The number

Returns:

  • (Number) —

    The rounded number

Raises:



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# File 'lib/sass/script/functions.rb', line 807

def ceil(value)
  numeric_transformation(value) {|n| n.ceil}
end

#comparable(number1, number2) ⇒ Bool

Returns true if two numbers are similar enough to be added, subtracted, or compared. For example:

comparable(2px, 1px) => true
comparable(100px, 3em) => false
comparable(10cm, 3mm) => true

Parameters:

Returns:

  • (Bool) —

    indicating if the numbers can be compared.

Raises:

  • (ArgumentError) —

    if number1 or number2 aren't numbers



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# File 'lib/sass/script/functions.rb', line 764

def comparable(number1, number2)
  assert_type number1, :Number
  assert_type number2, :Number
  Sass::Script::Bool.new(number1.comparable_to?(number2))
end

#complement(color) ⇒ Color

Returns the complement of a color. This is identical to adjust-hue(color, 180deg).

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if color isn't a color

See Also:



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# File 'lib/sass/script/functions.rb', line 671

def complement(color)
  adjust_hue color, Number.new(180)
end

#darken(color, amount) ⇒ Color

Makes a color darker. Takes a color and an amount between 0% and 100%, and returns a color with the lightness decreased by that value.

For example:

darken(hsl(25, 100%, 80%), 30%) => hsl(25, 100%, 50%)
darken(#800, 20%) => #200

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    If color isn't a color, or number isn't a number between 0% and 100%

See Also:



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# File 'lib/sass/script/functions.rb', line 525

def darken(color, amount)
  adjust(color, amount, :lightness, 0..100, :-, "%")
end

#desaturate(color, amount) ⇒ Color

Makes a color less saturated. Takes a color and an amount between 0% and 100%, and returns a color with the saturation decreased by that value.

For example:

desaturate(hsl(120, 30%, 90%), 20%) => hsl(120, 10%, 90%)
desaturate(#855, 20%) => #726b6b

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    If color isn't a color, or number isn't a number between 0% and 100%

See Also:



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# File 'lib/sass/script/functions.rb', line 563

def desaturate(color, amount)
  adjust(color, amount, :saturation, 0..100, :-, "%")
end

#floor(value) ⇒ Number

Rounds down to the nearest whole number. For example:

floor(10.4px) => 10px
floor(10.6px) => 10px

Parameters:

  • value (Number) —

    The number

Returns:

  • (Number) —

    The rounded number

Raises:



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# File 'lib/sass/script/functions.rb', line 820

def floor(value)
  numeric_transformation(value) {|n| n.floor}
end

#grayscale(color) ⇒ Color

Converts a color to grayscale. This is identical to desaturate(color, 100%).

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if color isn't a color

See Also:



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# File 'lib/sass/script/functions.rb', line 660

def grayscale(color)
  desaturate color, Number.new(100)
end

#green(color) ⇒ Number

Returns the green component of a color.

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    If color isn't a color



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# File 'lib/sass/script/functions.rb', line 352

def green(color)
  assert_type color, :Color
  Sass::Script::Number.new(color.green)
end

#hsl(hue, saturation, lightness) ⇒ Color

Creates a Color object from hue, saturation, and lightness. Uses the algorithm from the CSS3 spec.

Parameters:

  • hue (Number) —

    The hue of the color. Should be between 0 and 360 degrees, inclusive

  • saturation (Number) —

    The saturation of the color. Must be between 0% and 100%, inclusive

  • lightness (Number) —

    The lightness of the color. Must be between 0% and 100%, inclusive

Returns:

  • (Color) —

    The resulting color

Raises:

  • (ArgumentError) —

    if saturation or lightness are out of bounds

See Also:



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# File 'lib/sass/script/functions.rb', line 298

def hsl(hue, saturation, lightness)
  hsla(hue, saturation, lightness, Number.new(1))
end

#hsla(hue, saturation, lightness, alpha) ⇒ Color

Creates a Color object from hue, saturation, and lightness, as well as an alpha channel indicating opacity. Uses the algorithm from the CSS3 spec.

Parameters:

  • hue (Number) —

    The hue of the color. Should be between 0 and 360 degrees, inclusive

  • saturation (Number) —

    The saturation of the color. Must be between 0% and 100%, inclusive

  • lightness (Number) —

    The lightness of the color. Must be between 0% and 100%, inclusive

  • alpha (Number) —

    The opacity of the color. Must be between 0 and 1, inclusive

Returns:

  • (Color) —

    The resulting color

Raises:

  • (ArgumentError) —

    if saturation, lightness, or alpha are out of bounds

See Also:



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# File 'lib/sass/script/functions.rb', line 317

def hsla(hue, saturation, lightness, alpha)
  assert_type hue, :Number
  assert_type saturation, :Number
  assert_type lightness, :Number
  assert_type alpha, :Number

  unless (0..1).include?(alpha.value)
    raise ArgumentError.new("Alpha channel #{alpha.value} must be between 0 and 1")
  end

  original_s = saturation
  original_l = lightness
  # This algorithm is from http://www.w3.org/TR/css3-color#hsl-color
  h, s, l = [hue, saturation, lightness].map { |a| a.value }
  raise ArgumentError.new("Saturation #{s} must be between 0% and 100%") unless (0..100).include?(s)
  raise ArgumentError.new("Lightness #{l} must be between 0% and 100%") unless (0..100).include?(l)

  Color.new(:hue => h, :saturation => s, :lightness => l, :alpha => alpha.value)
end

#hue(color) ⇒ Number

Returns the hue component of a color.

See the CSS3 HSL specification.

Calculated from RGB where necessary via this algorithm.

Parameters:

Returns:

  • (Number) —

    between 0deg and 360deg

Raises:

  • (ArgumentError) —

    if color isn't a color

See Also:



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# File 'lib/sass/script/functions.rb', line 377

def hue(color)
  assert_type color, :Color
  Sass::Script::Number.new(color.hue, ["deg"])
end

#lighten(color, amount) ⇒ Color

Makes a color lighter. Takes a color and an amount between 0% and 100%, and returns a color with the lightness increased by that value.

For example:

lighten(hsl(0, 0%, 0%), 30%) => hsl(0, 0, 30)
lighten(#800, 20%) => #e00

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    If color isn't a color, or number isn't a number between 0% and 100%

See Also:



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# File 'lib/sass/script/functions.rb', line 506

def lighten(color, amount)
  adjust(color, amount, :lightness, 0..100, :+, "%")
end

#lightness(color) ⇒ Number

Returns the hue component of a color.

See the CSS3 HSL specification.

Calculated from RGB where necessary via this algorithm.

Parameters:

Returns:

  • (Number) —

    between 0% and 100%

Raises:

  • (ArgumentError) —

    if color isn't a color

See Also:



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# File 'lib/sass/script/functions.rb', line 409

def lightness(color)
  assert_type color, :Color
  Sass::Script::Number.new(color.lightness, ["%"])
end

#mix(color1, color2, weight = 50%) ⇒ Color

Mixes together two colors. Specifically, takes the average of each of the RGB components, optionally weighted by the given percentage. The opacity of the colors is also considered when weighting the components.

The weight specifies the amount of the first color that should be included in the returned color. The default, 50%, means that half the first color and half the second color should be used. 25% means that a quarter of the first color and three quarters of the second color should be used.

For example:

mix(#f00, #00f) => #7f007f
mix(#f00, #00f, 25%) => #3f00bf
mix(rgba(255, 0, 0, 0.5), #00f) => rgba(63, 0, 191, 0.75)

Parameters:

  • color1 (Color)
  • color2 (Color)
  • weight (Number) (defaults to: 50%) —

    between 0% and 100%

Returns:

Raises:

  • (ArgumentError) —

    if color1 or color2 aren't colors, or weight isn't a number between 0% and 100%



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# File 'lib/sass/script/functions.rb', line 612

def mix(color1, color2, weight = Number.new(50))
  assert_type color1, :Color
  assert_type color2, :Color
  assert_type weight, :Number

  unless (0..100).include?(weight.value)
    raise ArgumentError.new("Weight #{weight} must be between 0% and 100%")
  end

  # This algorithm factors in both the user-provided weight
  # and the difference between the alpha values of the two colors
  # to decide how to perform the weighted average of the two RGB values.
  #
  # It works by first normalizing both parameters to be within [-1, 1],
  # where 1 indicates "only use color1", -1 indicates "only use color 0",
  # and all values in between indicated a proportionately weighted average.
  #
  # Once we have the normalized variables w and a,
  # we apply the formula (w + a)/(1 + w*a)
  # to get the combined weight (in [-1, 1]) of color1.
  # This formula has two especially nice properties:
  #
  #   * When either w or a are -1 or 1, the combined weight is also that number
  #     (cases where w * a == -1 are undefined, and handled as a special case).
  #
  #   * When a is 0, the combined weight is w, and vice versa
  #
  # Finally, the weight of color1 is renormalized to be within [0, 1]
  # and the weight of color2 is given by 1 minus the weight of color1.
  p = weight.value/100.0
  w = p*2 - 1
  a = color1.alpha - color2.alpha

  w1 = (((w * a == -1) ? w : (w + a)/(1 + w*a)) + 1)/2.0
  w2 = 1 - w1

  rgb = color1.rgb.zip(color2.rgb).map {|v1, v2| v1*w1 + v2*w2}
  alpha = color1.alpha*p + color2.alpha*(1-p)
  Color.new(rgb + [alpha])
end

#opacify(color, amount) ⇒ Color Also known as: fade_in

Makes a color more opaque. Takes a color and an amount between 0 and 1, and returns a color with the opacity increased by that value.

For example:

opacify(rgba(0, 0, 0, 0.5), 0.1) => rgba(0, 0, 0, 0.6)
opacify(rgba(0, 0, 17, 0.8), 0.2) => #001

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    If color isn't a color, or number isn't a number between 0 and 1

See Also:



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# File 'lib/sass/script/functions.rb', line 466

def opacify(color, amount)
  adjust(color, amount, :alpha, 0..1, :+)
end

#opacity(color) ⇒ Number

Returns the alpha component (opacity) of a color. This is 1 unless otherwise specified.

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    If color isn't a color

See Also:



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# File 'lib/sass/script/functions.rb', line 446

def opacity(color)
  assert_type color, :Color
  Sass::Script::Number.new(color.alpha)
end

#percentage(value) ⇒ Number

Converts a decimal number to a percentage. For example:

percentage(100px / 50px) => 200%

Parameters:

  • value (Number) —

    The decimal number to convert to a percentage

Returns:

Raises:

  • (ArgumentError) —

    If value isn't a unitless number



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# File 'lib/sass/script/functions.rb', line 778

def percentage(value)
  unless value.is_a?(Sass::Script::Number) && value.unitless?
    raise ArgumentError.new("#{value.inspect} is not a unitless number")
  end
  Sass::Script::Number.new(value.value * 100, ['%'])
end

#quote(str) ⇒ String

Add quotes to a string if the string isn't quoted, or returns the same string if it is.

quote("foo") => "foo" quote(foo) => "foo"

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if str isn't a string

See Also:



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# File 'lib/sass/script/functions.rb', line 700

def quote(str)
  assert_type str, :String
  Sass::Script::String.new(str.value, :string)
end

#red(color) ⇒ Number

Returns the red component of a color.

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    If color isn't a color



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# File 'lib/sass/script/functions.rb', line 342

def red(color)
  assert_type color, :Color
  Sass::Script::Number.new(color.red)
end

#rgb(red, green, blue) ⇒ Color

Creates a Color object from red, green, and blue values.

Parameters:

  • red (Number) —

    A number between 0 and 255 inclusive, or between 0% and 100% inclusive

  • green (Number) —

    A number between 0 and 255 inclusive, or between 0% and 100% inclusive

  • blue (Number) —

    A number between 0 and 255 inclusive, or between 0% and 100% inclusive

Returns:

See Also:



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# File 'lib/sass/script/functions.rb', line 222

def rgb(red, green, blue)
  assert_type red, :Number
  assert_type green, :Number
  assert_type blue, :Number

  Color.new([red, green, blue].map do |c|
      v = c.value
      if c.numerator_units == ["%"] && c.denominator_units.empty?
        next v * 255 / 100.0 if (0..100).include?(v)
        raise ArgumentError.new("Color value #{c} must be between 0% and 100% inclusive")
      else
        next v if (0..255).include?(v)
        raise ArgumentError.new("Color value #{v} must be between 0 and 255 inclusive")
      end
    end)
end

#rgba(red, green, blue, alpha) ⇒ Color #rgba(color, alpha) ⇒ Color

Overloads:

  • #rgba(red, green, blue, alpha) ⇒ Color

    Creates a Color object from red, green, and blue values, as well as an alpha channel indicating opacity.

    Parameters:

    • red (Number) —

      A number between 0 and 255 inclusive

    • green (Number) —

      A number between 0 and 255 inclusive

    • blue (Number) —

      A number between 0 and 255 inclusive

    • alpha (Number) —

      A number between 0 and 1

    Returns:

  • #rgba(color, alpha) ⇒ Color

    Sets the opacity of a color.

    Examples:

    rgba(#102030, 0.5) => rgba(16, 32, 48, 0.5)
rgba(blue, 0.2)    => rgba(0, 0, 255, 0.2)

    Parameters:

    • color (Color)
    • alpha (Number) —

      A number between 0 and 1

    Returns:

See Also:



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# File 'lib/sass/script/functions.rb', line 265

def rgba(*args)
  case args.size
  when 2
    color, alpha = args

    assert_type color, :Color
    assert_type alpha, :Number

    unless (0..1).include?(alpha.value)
      raise ArgumentError.new("Alpha channel #{alpha.value} must be between 0 and 1 inclusive")
    end

    color.with(:alpha => alpha.value)
  when 4
    red, green, blue, alpha = args
    rgba(rgb(red, green, blue), alpha)
  else
    raise ArgumentError.new("wrong number of arguments (#{args.size} for 4)")
  end
end

#round(value) ⇒ Number

Rounds a number to the nearest whole number. For example:

round(10.4px) => 10px
round(10.6px) => 11px

Parameters:

  • value (Number) —

    The number

Returns:

  • (Number) —

    The rounded number

Raises:



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# File 'lib/sass/script/functions.rb', line 794

def round(value)
  numeric_transformation(value) {|n| n.round}
end

#saturate(color, amount) ⇒ Color

Makes a color more saturated. Takes a color and an amount between 0% and 100%, and returns a color with the saturation increased by that value.

For example:

saturate(hsl(120, 30%, 90%), 20%) => hsl(120, 50%, 90%)
saturate(#855, 20%) => #9e3f3f

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    If color isn't a color, or number isn't a number between 0% and 100%

See Also:



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# File 'lib/sass/script/functions.rb', line 544

def saturate(color, amount)
  adjust(color, amount, :saturation, 0..100, :+, "%")
end

#saturation(color) ⇒ Number

Returns the saturation component of a color.

See the CSS3 HSL specification.

Calculated from RGB where necessary via this algorithm.

Parameters:

Returns:

  • (Number) —

    between 0% and 100%

Raises:

  • (ArgumentError) —

    if color isn't a color

See Also:



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# File 'lib/sass/script/functions.rb', line 393

def saturation(color)
  assert_type color, :Color
  Sass::Script::Number.new(color.saturation, ["%"])
end

#transparentize(color, amount) ⇒ Color Also known as: fade_out

Makes a color more transparent. Takes a color and an amount between 0 and 1, and returns a color with the opacity decreased by that value.

For example:

transparentize(rgba(0, 0, 0, 0.5), 0.1) => rgba(0, 0, 0, 0.4)
transparentize(rgba(0, 0, 0, 0.8), 0.2) => rgba(0, 0, 0, 0.6)

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    If color isn't a color, or number isn't a number between 0 and 1

See Also:



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# File 'lib/sass/script/functions.rb', line 486

def transparentize(color, amount)
  adjust(color, amount, :alpha, 0..1, :-)
end

#type_of(obj) ⇒ String

Inspects the type of the argument, returning it as an unquoted string. For example:

type-of(100px)  => number
type-of(asdf)   => string
type-of("asdf") => string
type-of(true)   => bool
type-of(#fff)   => color
type-of(blue)   => color

Parameters:

  • obj (Literal) —

    The object to inspect

Returns:

  • (String) —

    The unquoted string name of the literal's type



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# File 'lib/sass/script/functions.rb', line 717

def type_of(obj)
  Sass::Script::String.new(obj.class.name.gsub(/Sass::Script::/,'').downcase)
end

#unit(number) ⇒ String

Inspects the unit of the number, returning it as a quoted string. Complex units are sorted in alphabetical order by numerator and denominator. For example:

unit(100) => ""
unit(100px) => "px"
unit(3em) => "em"
unit(10px * 5em) => "em*px"
unit(10px * 5em / 30cm / 1rem) => "em*px/cm*rem"

Parameters:

  • number (Literal) —

    The number to inspect

Returns:

  • (String) —

    The unit(s) of the number

Raises:

  • (ArgumentError) —

    if number isn't a number



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# File 'lib/sass/script/functions.rb', line 734

def unit(number)
  assert_type number, :Number
  Sass::Script::String.new(number.unit_str, :string)
end

#unitless(number) ⇒ Bool

Inspects the unit of the number, returning a boolean indicating if it is unitless. For example:

unitless(100) => true
unitless(100px) => false

Parameters:

  • number (Literal) —

    The number to inspect

Returns:

  • (Bool) —

    Whether or not the number is unitless

Raises:

  • (ArgumentError) —

    if number isn't a number



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# File 'lib/sass/script/functions.rb', line 748

def unitless(number)
  assert_type number, :Number
  Sass::Script::Bool.new(number.unitless?)
end

#unquote(str) ⇒ String

Removes quotes from a string if the string is quoted, or returns the same string if it's not.

unquote("foo") => foo unquote(foo) => foo

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if str isn't a string

See Also:



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# File 'lib/sass/script/functions.rb', line 685

def unquote(str)
  assert_type str, :String
  Sass::Script::String.new(str.value, :identifier)
end