Module: Sass::Script::Functions

Included in:
EvaluationContext
Defined in:
/Users/ceppstei/Projects/sass-lang/.sass/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:

Note: These functions are described in more detail below.

RGB Functions

rgb($red, $green, $blue)
Creates a Color from red, green, and blue values.
rgba($red, $green, $blue, $alpha)
Creates a Color from red, green, blue, and alpha values.
red($color)
Gets the red component of a color.
green($color)
Gets the green component of a color.
blue($color)
Gets the blue component of a color.
mix($color1, $color2, [$weight])
Mixes two colors together.

HSL Functions

hsl($hue, $saturation, $lightness)
Creates a Color from hue, saturation, and lightness values.
hsla($hue, $saturation, $lightness, $alpha)
Creates a Color from hue, saturation, lightness, and alpha values.
hue($color)
Gets the hue component of a color.
saturation($color)
Gets the saturation component of a color.
lightness($color)
Gets the lightness component of a color.
adjust-hue($color, $degrees)
Changes the hue of a color.
lighten($color, $amount)
Makes a color lighter.
darken($color, $amount)
Makes a color darker.
saturate($color, $amount)
Makes a color more saturated.
desaturate($color, $amount)
Makes a color less saturated.
grayscale($color)
Converts a color to grayscale.
complement($color)
Returns the complement of a color.
invert($color)
Returns the inverse of a color.

Opacity Functions

alpha($color) / opacity($color)
Gets the alpha component (opacity) of a color.
rgba($color, $alpha)
Changes the alpha component for a color.
opacify($color, $amount) / fade-in($color, $amount)
Makes a color more opaque.
transparentize($color, $amount) / fade-out($color, $amount)
Makes a color more transparent.

Other Color Functions

adjust-color($color, [$red], [$green], [$blue], [$hue], [$saturation], [$lightness], [$alpha])
Increases or decreases one or more components of a color.
scale-color($color, [$red], [$green], [$blue], [$saturation], [$lightness], [$alpha])
Fluidly scales one or more properties of a color.
change-color($color, [$red], [$green], [$blue], [$hue], [$saturation], [$lightness], [$alpha])
Changes one or more properties of a color.
ie-hex-str($color)
Converts a color into the format understood by IE filters.

String Functions

unquote($string)
Removes quotes from a string.
quote($string)
Adds quotes to a string.
str-length($string)
Returns the number of characters in a string.
str-insert($string, $insert, $index)
Inserts $insert into $string at $index.
str-index($string, $substring)
Returns the index of the first occurrence of $substring in $string.
str-slice($string, $start-at, [$end-at])
Extracts a substring from $string.
to-upper-case($string)
Converts a string to upper case.
to-lower-case($string)
Converts a string to lower case.

Number Functions

percentage($number)
Converts a unitless number to a percentage.
round($number)
Rounds a number to the nearest whole number.
ceil($number)
Rounds a number up to the next whole number.
floor($number)
Rounds a number down to the previous whole number.
abs($number)
Returns the absolute value of a number.
min($numbers…)
Finds the minimum of several numbers.
max($numbers…)
Finds the maximum of several numbers.
random([$limit])
Returns a random number.

List Functions

Lists in Sass are immutable; all list functions return a new list rather than updating the existing list in-place.

All list functions work for maps as well, treating them as lists of pairs.

length($list)
Returns the length of a list.
nth($list, $n)
Returns a specific item in a list.
set-nth($list, $n, $value)
Replaces the nth item in a list.
join($list1, $list2, [$separator])
Joins together two lists into one.
append($list1, $val, [$separator])
Appends a single value onto the end of a list.
zip($lists…)
Combines several lists into a single multidimensional list.
index($list, $value)
Returns the position of a value within a list.
list-separator($list)
Returns the separator of a list.

Map Functions

Maps in Sass are immutable; all map functions return a new map rather than updating the existing map in-place.

map-get($map, $key)
Returns the value in a map associated with a given key.
map-merge($map1, $map2)
Merges two maps together into a new map.
map-remove($map, $keys…)
Returns a new map with keys removed.
map-keys($map)
Returns a list of all keys in a map.
map-values($map)
Returns a list of all values in a map.
map-has-key($map, $key)
Returns whether a map has a value associated with a given key.
keywords($args)
Returns the keywords passed to a function that takes variable arguments.

Selector Functions

Selector functions are very liberal in the formats they support for selector arguments. They can take a plain string, a list of lists as returned by & or anything in between:

  • A plain string, such as ".foo .bar, .baz .bang".
  • A space-separated list of strings such as (".foo" ".bar").
  • A comma-separated list of strings such as (".foo .bar", ".baz .bang").
  • A comma-separated list of space-separated lists of strings such as ((".foo" ".bar"), (".baz" ".bang")).

In general, selector functions allow placeholder selectors (%foo) but disallow parent-reference selectors (&).

selector-nest($selectors…)
Nests selector beneath one another like they would be nested in the stylesheet.
selector-append($selectors…)
Appends selectors to one another without spaces in between.
selector-extend($selector, $extendee, $extender)
Extends $extendee with $extender within $selector.
selector-replace($selector, $original, $replacement)
Replaces $original with $replacement within $selector.
selector-unify($selector1, $selector2)
Unifies two selectors to produce a selector that matches elements matched by both.
is-superselector($super, $sub)
Returns whether $super matches all the elements $sub does, and possibly more.
simple-selectors($selector)
Returns the simple selectors that comprise a compound selector.
selector-parse($selector)
Parses a selector into the format returned by &.

Introspection Functions

feature-exists($feature)
Returns whether a feature exists in the current Sass runtime.
variable-exists($name)
Returns whether a variable with the given name exists in the current scope.
global-variable-exists($name)
Returns whether a variable with the given name exists in the global scope.
function-exists($name)
Returns whether a function with the given name exists.
mixin-exists($name)
Returns whether a mixin with the given name exists.
inspect($value)
Returns the string representation of a value as it would be represented in Sass.
type-of($value)
Returns the type of a value.
unit($number)
Returns the unit(s) associated with a number.
unitless($number)
Returns whether a number has units.
comparable($number1, $number2)
Returns whether two numbers can be added, subtracted, or compared.
call($name, $args…)
Dynamically calls a Sass function.

Miscellaneous Functions

if($condition, $if-true, $if-false)
Returns one of two values, depending on whether or not $condition is true.
unique-id()
Returns a unique CSS identifier.

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::Value::String.new(string.value.reverse)
  end
  declare :reverse, [:string]
end

Calling Functions.declare tells Sass the argument names for your function. If omitted, the function will still work, but will not be able to accept keyword arguments. Functions.declare can also allow your function to take arbitrary keyword arguments.

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

Most Value 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 Value 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, Signature

Class Method Summary (collapse)

Instance Method Summary (collapse)

Class Method Details

+ declare(method_name, args, options = {})

Declare a Sass signature for a Ruby-defined function. This includes the names of the arguments, whether the function takes a variable number of arguments, and whether the function takes an arbitrary set of keyword arguments.

It’s not necessary to declare a signature for a function. However, without a signature it won’t support keyword arguments.

A single function can have multiple signatures declared as long as each one takes a different number of arguments. It’s also possible to declare multiple signatures that all take the same number of arguments, but none of them but the first will be used unless the user uses keyword arguments.

Examples:

declare :rgba, [:hex, :alpha]
declare :rgba, [:red, :green, :blue, :alpha]
declare :accepts_anything, [], :var_args => true, :var_kwargs => true
declare :some_func, [:foo, :bar, :baz], :var_kwargs => true

Parameters:

  • method_name (Symbol) —

    The name of the method whose signature is being declared.

  • args (Array<Symbol>) —

    The names of the arguments for the function signature.

  • options (Hash) (defaults to: {}) —

    a customizable set of options

Options Hash (options):

  • :var_args (Boolean) — default: false —

    Whether the function accepts a variable number of (unnamed) arguments in addition to the named arguments.

  • :var_kwargs (Boolean) — default: false —

    Whether the function accepts other keyword arguments in addition to those in :args. If this is true, the Ruby function will be passed a hash from strings to Values as the last argument. In addition, if this is true and :var_args is not, Sass will ensure that the last argument passed is a hash.



406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 406

def self.declare(method_name, args, options = {})
  delayed_args = []
  args = args.map do |a|
    a = a.to_s
    if a[0] == ?&
      a = a[1..-1]
      delayed_args << a
    end
    a
  end
  # We don't expose this functionality except to certain builtin methods.
  if delayed_args.any? && method_name != :if
    raise ArgumentError.new("Delayed arguments are not allowed for method #{method_name}")
  end
  @signatures[method_name] ||= []
  @signatures[method_name] << Signature.new(
    args,
    delayed_args,
    options[:var_args],
    options[:var_kwargs],
    options[:deprecated] && options[:deprecated].map {|a| a.to_s})
end

+ (Random) random_number_generator

Get Sass’s internal random number generator.

Returns:

  • (Random) 


480
481
482
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 480

def self.random_number_generator
  @random_number_generator ||= Sass::Util::CrossPlatformRandom.new
end

+ (Integer) random_seed=(seed)

Sets the random seed used by Sass’s internal random number generator.

This can be used to ensure consistent random number sequences which allows for consistent results when testing, etc.

Parameters:

  • seed (Integer)

Returns:

  • (Integer) —

    The same seed.



473
474
475
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 473

def self.random_seed=(seed)
  @random_number_generator = Sass::Util::CrossPlatformRandom.new(seed)
end

+ ({Symbol => Object}?) signature(method_name, arg_arity, kwarg_arity)

Determine the correct signature for the number of arguments passed in for a given function. If no signatures match, the first signature is returned for error messaging.

Parameters:

  • method_name (Symbol) —

    The name of the Ruby function to be called.

  • arg_arity (Fixnum) —

    The number of unnamed arguments the function was passed.

  • kwarg_arity (Fixnum) —

    The number of keyword arguments the function was passed.

Returns:

  • ({Symbol => Object}, nil) —

    The signature options for the matching signature, or nil if no signatures are declared for this function. See declare.



440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 440

def self.signature(method_name, arg_arity, kwarg_arity)
  return unless @signatures[method_name]
  @signatures[method_name].each do |signature|
    sig_arity = signature.args.size
    return signature if sig_arity == arg_arity + kwarg_arity
    next unless sig_arity < arg_arity + kwarg_arity

    # We have enough args.
    # Now we need to figure out which args are varargs
    # and if the signature allows them.
    t_arg_arity, t_kwarg_arity = arg_arity, kwarg_arity
    if sig_arity > t_arg_arity
      # we transfer some kwargs arity to args arity
      # if it does not have enough args -- assuming the names will work out.
      t_kwarg_arity -= (sig_arity - t_arg_arity)
      t_arg_arity = sig_arity
    end

    if (t_arg_arity == sig_arity || t_arg_arity > sig_arity && signature.var_args) &&
       (t_kwarg_arity == 0 || t_kwarg_arity > 0 && signature.var_kwargs)
      return signature
    end
  end
  @signatures[method_name].first
end

Instance Method Details

- (Sass::Script::Value::Number) abs($number)

Returns the absolute value of a number.

Examples:

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

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $number isn’t a number



1776
1777
1778
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1776

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

- (Sass::Script::Value::Color) adjust_color($color, [$red], [$green], [$blue], [$hue], [$saturation], [$lightness], [$alpha])

Increases or decreases one or more properties of a color. This can change the red, green, blue, hue, saturation, value, and alpha properties. The properties are specified as keyword arguments, and are added to or subtracted from the color’s current value for that property.

All properties are optional. You can’t specify both RGB properties ($red, $green, $blue) and HSL properties ($hue, $saturation, $value) at the same time.

Examples:

adjust-color(#102030, $blue: 5) => #102035
adjust-color(#102030, $red: -5, $blue: 5) => #0b2035
adjust-color(hsl(25, 100%, 80%), $lightness: -30%, $alpha: -0.4) => hsla(25, 100%, 50%, 0.6)

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if any parameter is the wrong type or out-of bounds, or if RGB properties and HSL properties are adjusted at the same time



1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1126

def adjust_color(color, kwargs)
  assert_type color, :Color, :color
  with = Sass::Util.map_hash(
    "red" => [-255..255, ""],
    "green" => [-255..255, ""],
    "blue" => [-255..255, ""],
    "hue" => nil,
    "saturation" => [-100..100, "%"],
    "lightness" => [-100..100, "%"],
    "alpha" => [-1..1, ""]
  ) do |name, (range, units)|
    val = kwargs.delete(name)
    next unless val
    assert_type val, :Number, name
    Sass::Util.check_range("$#{name}: Amount", range, val, units) if range
    adjusted = color.send(name) + val.value
    adjusted = [0, Sass::Util.restrict(adjusted, range)].max if range
    [name.to_sym, adjusted]
  end

  unless kwargs.empty?
    name, val = kwargs.to_a.first
    raise ArgumentError.new("Unknown argument $#{name} (#{val})")
  end

  color.with(with)
end

- (Sass::Script::Value::Color) adjust_hue($color, $degrees)

Changes the hue of a color. Takes a color and a number of degrees (usually between -360deg and 360deg), and returns a color with the hue rotated along the color wheel by that amount.

Examples:

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

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if either parameter is the wrong type



1068
1069
1070
1071
1072
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1068

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

- (Sass::Script::Value::Number) alpha($color)

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 as a special case.

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $color isn’t a color



898
899
900
901
902
903
904
905
906
907
908
909
910
911
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 898

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

  raise ArgumentError.new("wrong number of arguments (#{args.size} for 1)") if args.size != 1

  assert_type args.first, :Color, :color
  number(args.first.alpha)
end

- (Sass::Script::Value::List) append($list, $val, $separator:auto)

Appends a single value onto the end of a list.

Unless the $separator argument is passed, if the list had only one item, the resulting list will be space-separated.

Like all list functions, append() returns a new list rather than modifying its argument in place.

Examples:

append(10px 20px, 30px) => 10px 20px 30px
append((blue, red), green) => blue, red, green
append(10px 20px, 30px 40px) => 10px 20px (30px 40px)
append(10px, 20px, comma) => 10px, 20px
append((blue, red), green, space) => blue red green

Parameters:

Returns:



1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1950

def append(list, val, separator = identifier("auto"))
  assert_type separator, :String, :separator
  unless %w(auto space comma).include?(separator.value)
    raise ArgumentError.new("Separator name must be space, comma, or auto")
  end
  sep = if separator.value == 'auto'
          list.separator || :space
        else
          separator.value.to_sym
        end
  list(list.to_a + [val], sep)
end

- (Sass::Script::Value::Number) blue($color)

Gets the blue component of a color. Calculated from HSL where necessary via this algorithm.

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $color isn’t a color



828
829
830
831
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 828

def blue(color)
  assert_type color, :Color, :color
  number(color.blue)
end

- call($name, $args...)

Dynamically calls a function. This can call user-defined functions, built-in functions, or plain CSS functions. It will pass along all arguments, including keyword arguments, to the called function.

Examples:

call(rgb, 10, 100, 255) => #0a64ff
call(scale-color, #0a64ff, $lightness: -10%) => #0058ef

$fn: nth;
call($fn, (a b c), 2) => b

Parameters:

  • $name (String) —

    The name of the function to call.



2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 2218

def call(name, *args)
  assert_type name, :String, :name
  kwargs = args.last.is_a?(Hash) ? args.pop : {}
  funcall = Sass::Script::Tree::Funcall.new(
    name.value,
    args.map {|a| Sass::Script::Tree::Literal.new(a)},
    Sass::Util.map_vals(kwargs) {|v| Sass::Script::Tree::Literal.new(v)},
    nil,
    nil)
  funcall.options = options
  perform(funcall)
end

- (Sass::Script::Value::Number) ceil($number)

Rounds a number up to the next whole number.

Examples:

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

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $number isn’t a number



1748
1749
1750
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1748

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

- (Sass::Script::Value::Color) change_color($color, [$red], [$green], [$blue], [$hue], [$saturation], [$lightness], [$alpha])

Changes one or more properties of a color. This can change the red, green, blue, hue, saturation, value, and alpha properties. The properties are specified as keyword arguments, and replace the color’s current value for that property.

All properties are optional. You can’t specify both RGB properties ($red, $green, $blue) and HSL properties ($hue, $saturation, $value) at the same time.

Examples:

change-color(#102030, $blue: 5) => #102005
change-color(#102030, $red: 120, $blue: 5) => #782005
change-color(hsl(25, 100%, 80%), $lightness: 40%, $alpha: 0.8) => hsla(25, 100%, 40%, 0.8)

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if any parameter is the wrong type or out-of bounds, or if RGB properties and HSL properties are adjusted at the same time



1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1258

def change_color(color, kwargs)
  assert_type color, :Color, :color
  with = Sass::Util.map_hash(
    'red' => ['Red value', 0..255],
    'green' => ['Green value', 0..255],
    'blue' => ['Blue value', 0..255],
    'hue' => [],
    'saturation' => ['Saturation', 0..100, '%'],
    'lightness' => ['Lightness', 0..100, '%'],
    'alpha' => ['Alpha channel', 0..1]
  ) do |name, (desc, range, unit)|
    val = kwargs.delete(name)
    next unless val
    assert_type val, :Number, name

    if range
      val = Sass::Util.check_range(desc, range, val, unit)
    else
      val = val.value
    end

    [name.to_sym, val]
  end

  unless kwargs.empty?
    name, val = kwargs.to_a.first
    raise ArgumentError.new("Unknown argument $#{name} (#{val})")
  end

  color.with(with)
end

- (Sass::Script::Value::Bool) comparable($number1, $number2)

Returns whether two numbers can added, subtracted, or compared.

Examples:

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

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if either parameter is the wrong type



1701
1702
1703
1704
1705
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1701

def comparable(number1, number2)
  assert_type number1, :Number, :number1
  assert_type number2, :Number, :number2
  bool(number1.comparable_to?(number2))
end

- (Sass::Script::Value::Color) complement($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:



1377
1378
1379
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1377

def complement(color)
  adjust_hue color, number(180)
end

- (Sass::Script::Value::String) counter($args...)

This function only exists as a workaround for IE7‘s content: counter bug. It works identically to any other plain-CSS function, except it avoids adding spaces between the argument commas.

Examples:

counter(item, ".") => counter(item,".")

Returns:



2241
2242
2243
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 2241

def counter(*args)
  identifier("counter(#{args.map {|a| a.to_s(options)}.join(',')})")
end

- (Sass::Script::Value::String) counters($args...)

This function only exists as a workaround for IE7‘s content: counter bug. It works identically to any other plain-CSS function, except it avoids adding spaces between the argument commas.

Examples:

counters(item, ".") => counters(item,".")

Returns:



2255
2256
2257
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 2255

def counters(*args)
  identifier("counters(#{args.map {|a| a.to_s(options)}.join(',')})")
end

- (Sass::Script::Value::Color) darken($color, $amount)

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

Examples:

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

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $amount is out of bounds, or either parameter is the wrong type

See Also:



1007
1008
1009
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1007

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

- (Sass::Script::Value::Color) desaturate($color, $amount)

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

Examples:

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

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $amount is out of bounds, or either parameter is the wrong type

See Also:



1049
1050
1051
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1049

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

- (Sass::Script::Value::Bool) feature_exists($feature)

Returns whether a feature exists in the current Sass runtime.

The following features are supported:

  • global-variable-shadowing indicates that a local variable will shadow a global variable unless !global is used.

  • extend-selector-pseudoclass indicates that @extend will reach into selector pseudoclasses like :not.

  • units-level-3 indicates full support for unit arithmetic using units defined in the Values and Units Level 3 spec.

  • at-error indicates that the Sass @error directive is supported.

Examples:

feature-exists(some-feature-that-exists) => true
feature-exists(what-is-this-i-dont-know) => false

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $feature isn’t a string



1649
1650
1651
1652
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1649

def feature_exists(feature)
  assert_type feature, :String, :feature
  bool(Sass.has_feature?(feature.value))
end

- (Sass::Script::Value::Number) floor($number)

Rounds a number down to the previous whole number.

Examples:

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

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $number isn’t a number



1762
1763
1764
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1762

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

- (Sass::Script::Value::Bool) function_exists($name)

Check whether a function with the given name exists.

Examples:

function-exists(lighten) => true

@function myfunc { @return "something"; }
function-exists(myfunc) => true

Parameters:

Returns:



2315
2316
2317
2318
2319
2320
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 2315

def function_exists(name)
  assert_type name, :String, :name
  exists = Sass::Script::Functions.callable?(name.value.tr("-", "_"))
  exists ||= environment.function(name.value)
  bool(exists)
end

- (Sass::Script::Value::Bool) global_variable_exists($name)

Check whether a variable with the given name exists in the global scope (at the top level of the file).

Examples:

$a-false-value: false;
global-variable-exists(a-false-value) => true

.foo {
  $some-var: false;
  @if global-variable-exists(some-var) { /* false, doesn't run */ }
}

Parameters:

Returns:



2297
2298
2299
2300
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 2297

def global_variable_exists(name)
  assert_type name, :String, :name
  bool(environment.global_env.var(name.value))
end

- (Sass::Script::Value::Color) grayscale($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:



1361
1362
1363
1364
1365
1366
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1361

def grayscale(color)
  if color.is_a?(Sass::Script::Value::Number)
    return identifier("grayscale(#{color})")
  end
  desaturate color, number(100)
end

- (Sass::Script::Value::Number) green($color)

Gets the green component of a color. Calculated from HSL where necessary via this algorithm.

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $color isn’t a color



812
813
814
815
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 812

def green(color)
  assert_type color, :Color, :color
  number(color.green)
end

- (Sass::Script::Value::Color) hsl($hue, $saturation, $lightness)

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

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $saturation or $lightness are out of bounds or any parameter is the wrong type

See Also:



736
737
738
739
740
741
742
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 736

def hsl(hue, saturation, lightness)
  if calc?(hue) || calc?(saturation) || calc?(lightness)
    unquoted_string("hsl(#{hue}, #{saturation}, #{lightness})")
  else
    hsla(hue, saturation, lightness, number(1))
  end
end

- (Sass::Script::Value::Color) hsla($hue, $saturation, $lightness, $alpha)

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

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $saturation, $lightness, or $alpha are out of bounds or any parameter is the wrong type

See Also:



764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 764

def hsla(hue, saturation, lightness, alpha)
  if calc?(hue) || calc?(saturation) || calc?(lightness) || calc?(alpha)
    return unquoted_string("hsla(#{hue}, #{saturation}, #{lightness}, #{alpha})")
  end
  assert_type hue, :Number, :hue
  assert_type saturation, :Number, :saturation
  assert_type lightness, :Number, :lightness
  assert_type alpha, :Number, :alpha
  check_alpha_unit alpha, 'hsla'

  h = hue.value
  s = saturation.value
  l = lightness.value

  # Don't store the string representation for function-created colors, both
  # because it's not very useful and because some functions aren't supported
  # on older browsers.
  Sass::Script::Value::Color.new(
    :hue => h, :saturation => s, :lightness => l, :alpha => alpha.value)
end

- (Sass::Script::Value::Number) hue($color)

Returns the hue component of a color. See the CSS3 HSL specification. Calculated from RGB where necessary via this algorithm.

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $color isn’t a color



846
847
848
849
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 846

def hue(color)
  assert_type color, :Color, :color
  number(color.hue, "deg")
end

- (Sass::Script::Value::String) ie_hex_str($color)

Converts a color into the format understood by IE filters.

Examples:

ie-hex-str(#abc) => #FFAABBCC
ie-hex-str(#3322BB) => #FF3322BB
ie-hex-str(rgba(0, 255, 0, 0.5)) => #8000FF00

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $color isn’t a color



1086
1087
1088
1089
1090
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1086

def ie_hex_str(color)
  assert_type color, :Color, :color
  alpha = Sass::Util.round(color.alpha * 255).to_s(16).rjust(2, '0')
  identifier("##{alpha}#{color.send(:hex_str)[1..-1]}".upcase)
end

- (Sass::Script::Value::Base) if($condition, $if-true, $if-false)

Returns one of two values, depending on whether or not $condition is true. Just like in @if, all values other than false and null are considered to be true.

Examples:

if(true, 1px, 2px) => 1px
if(false, 1px, 2px) => 2px

Parameters:

Returns:



2179
2180
2181
2182
2183
2184
2185
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 2179

def if(condition, if_true, if_false)
  if condition.to_bool
    perform(if_true)
  else
    perform(if_false)
  end
end

- (Sass::Script::Value::Number, Sass::Script::Value::Null) index($list, $value)

Returns the position of a value within a list. If the value isn’t found, returns null instead.

Note that unlike some languages, the first item in a Sass list is number 1, the second number 2, and so forth.

This can return the position of a pair in a map as well.

Examples:

index(1px solid red, solid) => 2
index(1px solid red, dashed) => null
index((width: 10px, height: 20px), (height 20px)) => 2

Parameters:

Returns:



2011
2012
2013
2014
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 2011

def index(list, value)
  index = list.to_a.index {|e| e.eq(value).to_bool}
  index ? number(index + 1) : null
end

- (Sass::Script::Value::String) inspect($value)

Return a string containing the value as its Sass representation.

Parameters:

Returns:



2347
2348
2349
2350
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 2347

def inspect(value)
  value.check_deprecated_interp if value.is_a?(Sass::Script::Value::String)
  unquoted_string(value.to_sass)
end

- (Sass::Script::Value::Color) invert($color)

Returns the inverse (negative) of a color. The red, green, and blue values are inverted, while the opacity is left alone.

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $color isn’t a color



1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1389

def invert(color)
  if color.is_a?(Sass::Script::Value::Number)
    return identifier("invert(#{color})")
  end

  assert_type color, :Color, :color
  color.with(
    :red => (255 - color.red),
    :green => (255 - color.green),
    :blue => (255 - color.blue))
end

- (Sass::Script::Value::Bool) is_superselector($super, $sub)

Returns whether $super is a superselector of $sub. This means that $super matches all the elements that $sub matches, as well as possibly additional elements. In general, simpler selectors tend to be superselectors of more complex oned.

Examples:

is-superselector(".foo", ".foo.bar") => true
is-superselector(".foo.bar", ".foo") => false
is-superselector(".bar", ".foo .bar") => true
is-superselector(".foo .bar", ".bar") => false

Returns Whether $selector1 is a superselector of $selector2.

Parameters:

Returns:



2645
2646
2647
2648
2649
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 2645

def is_superselector(sup, sub)
  sup = parse_selector(sup, :super)
  sub = parse_selector(sub, :sub)
  bool(sup.superselector?(sub))
end

- (Sass::Script::Value::List) join($list1, $list2, $separator:auto)

Joins together two lists into one.

Unless $separator is passed, if one list is comma-separated and one is space-separated, the first parameter’s separator is used for the resulting list. If both lists have fewer than two items, spaces are used for the resulting list.

Like all list functions, join() returns a new list rather than modifying its arguments in place.

Examples:

join(10px 20px, 30px 40px) => 10px 20px 30px 40px
join((blue, red), (#abc, #def)) => blue, red, #abc, #def
join(10px, 20px) => 10px 20px
join(10px, 20px, comma) => 10px, 20px
join((blue, red), (#abc, #def), space) => blue red #abc #def

Parameters:

Returns:



1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1914

def join(list1, list2, separator = identifier("auto"))
  assert_type separator, :String, :separator
  unless %w(auto space comma).include?(separator.value)
    raise ArgumentError.new("Separator name must be space, comma, or auto")
  end
  sep = if separator.value == 'auto'
          list1.separator || list2.separator || :space
        else
          separator.value.to_sym
        end
  list(list1.to_a + list2.to_a, sep)
end

- (Sass::Script::Value::Map) keywords($args)

Returns the map of named arguments passed to a function or mixin that takes a variable argument list. The argument names are strings, and they do not contain the leading $.

Examples:

@mixin foo($args...) {
  @debug keywords($args); //=> (arg1: val, arg2: val)
}

@include foo($arg1: val, $arg2: val);

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $args isn’t a variable argument list



2160
2161
2162
2163
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 2160

def keywords(args)
  assert_type args, :ArgList, :args
  map(Sass::Util.map_keys(args.keywords.as_stored) {|k| Sass::Script::Value::String.new(k)})
end

- (Sass::Script::Value::Number) length($list)

Return the length of a list.

This can return the number of pairs in a map as well.

Examples:

length(10px) => 1
length(10px 20px 30px) => 3
length((width: 10px, height: 20px)) => 2

Parameters:

Returns:



1826
1827
1828
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1826

def length(list)
  number(list.to_a.size)
end

- (Sass::Script::Value::Color) lighten($color, $amount)

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

Examples:

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

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $amount is out of bounds, or either parameter is the wrong type

See Also:



988
989
990
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 988

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

- (Sass::Script::Value::Number) lightness($color)

Returns the lightness component of a color. See the CSS3 HSL specification. Calculated from RGB where necessary via this algorithm.

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $color isn’t a color



882
883
884
885
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 882

def lightness(color)
  assert_type color, :Color, :color
  number(color.lightness, "%")
end

- (Sass::Script::Value::String) list_separator($list)

Returns the separator of a list. If the list doesn’t have a separator due to having fewer than two elements, returns space.

Examples:

list-separator(1px 2px 3px) => space
list-separator(1px, 2px, 3px) => comma
list-separator('foo') => space

Parameters:

Returns:



2027
2028
2029
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 2027

def list_separator(list)
  identifier((list.separator || :space).to_s)
end

- (Sass::Script::Value::Base) map_get($map, $key)

Returns the value in a map associated with the given key. If the map doesn’t have such a key, returns null.

Examples:

map-get(("foo": 1, "bar": 2), "foo") => 1
map-get(("foo": 1, "bar": 2), "bar") => 2
map-get(("foo": 1, "bar": 2), "baz") => null

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $map is not a map



2045
2046
2047
2048
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 2045

def map_get(map, key)
  assert_type map, :Map, :map
  map.to_h[key] || null
end

- (Sass::Script::Value::Bool) map_has_key($map, $key)

Returns whether a map has a value associated with a given key.

Examples:

map-has-key(("foo": 1, "bar": 2), "foo") => true
map-has-key(("foo": 1, "bar": 2), "baz") => false

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $map is not a map



2140
2141
2142
2143
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 2140

def map_has_key(map, key)
  assert_type map, :Map, :map
  bool(map.to_h.has_key?(key))
end

- (List) map_keys($map)

Returns a list of all keys in a map.

Examples:

map-keys(("foo": 1, "bar": 2)) => "foo", "bar"

Parameters:

  • $map (Map)

Returns:

  • (List) —

    the list of keys, comma-separated

Raises:

  • (ArgumentError) —

    if $map is not a map



2108
2109
2110
2111
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 2108

def map_keys(map)
  assert_type map, :Map, :map
  list(map.to_h.keys, :comma)
end

- (Sass::Script::Value::Map) map_merge($map1, $map2)

Merges two maps together into a new map. Keys in $map2 will take precedence over keys in $map1.

This is the best way to add new values to a map.

All keys in the returned map that also appear in $map1 will have the same order as in $map1. New keys from $map2 will be placed at the end of the map.

Like all map functions, map-merge() returns a new map rather than modifying its arguments in place.

Examples:

map-merge(("foo": 1), ("bar": 2)) => ("foo": 1, "bar": 2)
map-merge(("foo": 1, "bar": 2), ("bar": 3)) => ("foo": 1, "bar": 3)

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if either parameter is not a map



2071
2072
2073
2074
2075
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 2071

def map_merge(map1, map2)
  assert_type map1, :Map, :map1
  assert_type map2, :Map, :map2
  map(map1.to_h.merge(map2.to_h))
end

- (Sass::Script::Value::Map) map_remove($map, $keys...)

Returns a new map with keys removed.

Like all map functions, map-merge() returns a new map rather than modifying its arguments in place.

Examples:

map-remove(("foo": 1, "bar": 2), "bar") => ("foo": 1)
map-remove(("foo": 1, "bar": 2, "baz": 3), "bar", "baz") => ("foo": 1)
map-remove(("foo": 1, "bar": 2), "baz") => ("foo": 1, "bar": 2)

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $map is not a map



2092
2093
2094
2095
2096
2097
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 2092

def map_remove(map, *keys)
  assert_type map, :Map, :map
  hash = map.to_h.dup
  hash.delete_if {|key, _| keys.include?(key)}
  map(hash)
end

- (List) map_values($map)

Returns a list of all values in a map. This list may include duplicate values, if multiple keys have the same value.

Examples:

map-values(("foo": 1, "bar": 2)) => 1, 2
map-values(("foo": 1, "bar": 2, "baz": 1)) => 1, 2, 1

Parameters:

  • $map (Map)

Returns:

  • (List) —

    the list of values, comma-separated

Raises:

  • (ArgumentError) —

    if $map is not a map



2124
2125
2126
2127
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 2124

def map_values(map)
  assert_type map, :Map, :map
  list(map.to_h.values, :comma)
end

- (Sass::Script::Value::Number) max($numbers...)

Finds the maximum of several numbers. This function takes any number of arguments.

Examples:

max(1px, 4px) => 4px
max(5em, 3em, 4em) => 5em

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if any argument isn’t a number, or if not all of the arguments have comparable units



1809
1810
1811
1812
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1809

def max(*values)
  values.each {|v| assert_type v, :Number}
  values.inject {|max, val| max.gt(val).to_bool ? max : val}
end

- (Sass::Script::Value::Number) min($numbers...)

Finds the minimum of several numbers. This function takes any number of arguments.

Examples:

min(1px, 4px) => 1px
min(5em, 3em, 4em) => 3em

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if any argument isn’t a number, or if not all of the arguments have comparable units



1792
1793
1794
1795
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1792

def min(*numbers)
  numbers.each {|n| assert_type n, :Number}
  numbers.inject {|min, num| min.lt(num).to_bool ? min : num}
end

- (Sass::Script::Value::Color) mix($color1, $color2, $weight:50%)

Mixes two colors together. 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.

Examples:

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

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $weight is out of bounds or any parameter is the wrong type



1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1313

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

  Sass::Util.check_range("Weight", 0..100, weight, '%')

  # This algorithm factors in both the user-provided weight (w) and the
  # difference between the alpha values of the two colors (a) 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 color2", 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).to_f
  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

  rgba = color1.rgb.zip(color2.rgb).map {|v1, v2| v1 * w1 + v2 * w2}
  rgba << color1.alpha * p + color2.alpha * (1 - p)
  rgb_color(*rgba)
end

- (Sass::Script::Value::Bool) mixin_exists($name)

Check whether a mixin with the given name exists.

Examples:

mixin-exists(nonexistent) => false

@mixin red-text { color: red; }
mixin-exists(red-text) => true

Parameters:

Returns:



2335
2336
2337
2338
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 2335

def mixin_exists(name)
  assert_type name, :String, :name
  bool(environment.mixin(name.value))
end

- (Sass::Script::Value::Base) nth($list, $n)

Gets the nth item in a list.

Note that unlike some languages, the first item in a Sass list is number 1, the second number 2, and so forth.

This can return the nth pair in a map as well.

Negative index values address elements in reverse order, starting with the last element in the list.

Examples:

nth(10px 20px 30px, 1) => 10px
nth((Helvetica, Arial, sans-serif), 3) => sans-serif
nth((width: 10px, length: 20px), 2) => length, 20px

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $n isn’t an integer between 1 and the length of $list



1882
1883
1884
1885
1886
1887
1888
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1882

def nth(list, n)
  assert_type n, :Number, :n
  Sass::Script::Value::List.assert_valid_index(list, n)

  index = n.to_i > 0 ? n.to_i - 1 : n.to_i
  list.to_a[index]
end

- (Sass::Script::Value::Color) opacify($color, $amount) Also known as: fade_in

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

Examples:

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 $amount is out of bounds, or either parameter is the wrong type

See Also:



944
945
946
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 944

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

- (Sass::Script::Value::Number) opacity($color)

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

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $color isn’t a color



921
922
923
924
925
926
927
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 921

def opacity(color)
  if color.is_a?(Sass::Script::Value::Number)
    return identifier("opacity(#{color})")
  end
  assert_type color, :Color, :color
  number(color.alpha)
end

- (Sass::Script::Value::Number) percentage($number)

Converts a unitless number to a percentage.

Examples:

percentage(0.2) => 20%
percentage(100px / 50px) => 200%

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $number isn’t a unitless number



1717
1718
1719
1720
1721
1722
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1717

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

- (Sass::Script::Value::String) quote($string)

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

Examples:

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

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $string isn’t a string

See Also:



1449
1450
1451
1452
1453
1454
1455
1456
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1449

def quote(string)
  assert_type string, :String, :string
  if string.type != :string
    quoted_string(string.value)
  else
    string
  end
end

- (Sass::Script::Value::Number) random - (Sass::Script::Value::Number) random($limit)

Overloads:



2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 2362

def random(limit = nil)
  generator = Sass::Script::Functions.random_number_generator
  if limit
    assert_integer limit, "limit"
    if limit.to_i < 1
      raise ArgumentError.new("$limit #{limit} must be greater than or equal to 1")
    end
    number(1 + generator.rand(limit.to_i))
  else
    number(generator.rand)
  end
end

- (Sass::Script::Value::Number) red($color)

Gets the red component of a color. Calculated from HSL where necessary via this algorithm.

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $color isn’t a color



796
797
798
799
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 796

def red(color)
  assert_type color, :Color, :color
  number(color.red)
end

- (Sass::Script::Value::Color) rgb($red, $green, $blue)

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

Parameters:

  • $red (Sass::Script::Value::Number) —

    The amount of red in the color. Must be between 0 and 255 inclusive, or between 0% and 100% inclusive

  • $green (Sass::Script::Value::Number) —

    The amount of green in the color. Must be between 0 and 255 inclusive, or between 0% and 100% inclusive

  • $blue (Sass::Script::Value::Number) —

    The amount of blue in the color. Must be between 0 and 255 inclusive, or between 0% and 100% inclusive

Returns:

Raises:

  • (ArgumentError) —

    if any parameter is the wrong type or out of bounds

See Also:



637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 637

def rgb(red, green, blue)
  if calc?(red) || calc?(green) || calc?(blue)
    return unquoted_string("rgb(#{red}, #{green}, #{blue})")
  end
  assert_type red, :Number, :red
  assert_type green, :Number, :green
  assert_type blue, :Number, :blue

  color_attrs = [red, green, blue].map do |c|
    if c.is_unit?("%")
      c.value * 255 / 100.0
    elsif c.unitless?
      c.value
    else
      raise ArgumentError.new("Expected #{c} to be unitless or have a unit of % but got #{c}")
    end
  end

  # Don't store the string representation for function-created colors, both
  # because it's not very useful and because some functions aren't supported
  # on older browsers.
  Sass::Script::Value::Color.new(color_attrs)
end

- (Sass::Script::Value::Color) rgba($red, $green, $blue, $alpha) - (Sass::Script::Value::Color) rgba($color, $alpha)

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

Overloads:

See Also:



693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 693

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

    assert_type color, :Color, :color
    if calc?(alpha)
      unquoted_string("rgba(#{color.red}, #{color.green}, #{color.blue}, #{alpha})")
    else
      assert_type alpha, :Number, :alpha
      check_alpha_unit alpha, 'rgba'
      color.with(:alpha => alpha.value)
    end
  when 4
    red, green, blue, alpha = args
    if calc?(red) || calc?(green) || calc?(blue) || calc?(alpha)
      unquoted_string("rgba(#{red}, #{green}, #{blue}, #{alpha})")
    else
      rgba(rgb(red, green, blue), alpha)
    end
  else
    raise ArgumentError.new("wrong number of arguments (#{args.size} for 4)")
  end
end

- (Sass::Script::Value::Number) round($number)

Rounds a number to the nearest whole number.

Examples:

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

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $number isn’t a number



1734
1735
1736
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1734

def round(number)
  numeric_transformation(number) {|n| Sass::Util.round(n)}
end

- (Sass::Script::Value::Color) saturate($color, $amount)

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

Examples:

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

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $amount is out of bounds, or either parameter is the wrong type

See Also:



1026
1027
1028
1029
1030
1031
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1026

def saturate(color, amount = nil)
  # Support the filter effects definition of saturate.
  # https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html
  return identifier("saturate(#{color})") if amount.nil?
  _adjust(color, amount, :saturation, 0..100, :+, "%")
end

- (Sass::Script::Value::Number) saturation($color)

Returns the saturation component of a color. See the CSS3 HSL specification. Calculated from RGB where necessary via this algorithm.

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $color isn’t a color



864
865
866
867
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 864

def saturation(color)
  assert_type color, :Color, :color
  number(color.saturation, "%")
end

- (Sass::Script::Value::Color) scale_color($color, [$red], [$green], [$blue], [$saturation], [$lightness], [$alpha])

Fluidly scales one or more properties of a color. Unlike adjust-color, which changes a color’s properties by fixed amounts, scale-color fluidly changes them based on how high or low they already are. That means that lightening an already-light color with scale-color won’t change the lightness much, but lightening a dark color by the same amount will change it more dramatically. This has the benefit of making scale-color($color, ...) have a similar effect regardless of what $color is.

For example, the lightness of a color can be anywhere between 0% and 100%. If scale-color($color, $lightness: 40%) is called, the resulting color’s lightness will be 40% of the way between its original lightness and 100. If scale-color($color, $lightness: -40%) is called instead, the lightness will be 40% of the way between the original and 0.

This can change the red, green, blue, saturation, value, and alpha properties. The properties are specified as keyword arguments. All arguments should be percentages between 0% and 100%.

All properties are optional. You can’t specify both RGB properties ($red, $green, $blue) and HSL properties ($saturation, $value) at the same time.

Examples:

scale-color(hsl(120, 70%, 80%), $lightness: 50%) => hsl(120, 70%, 90%)
scale-color(rgb(200, 150%, 170%), $green: -40%, $blue: 70%) => rgb(200, 90, 229)
scale-color(hsl(200, 70%, 80%), $saturation: -90%, $alpha: -30%) => hsla(200, 7%, 80%, 0.7)

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if any parameter is the wrong type or out-of bounds, or if RGB properties and HSL properties are adjusted at the same time



1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1194

def scale_color(color, kwargs)
  assert_type color, :Color, :color
  with = Sass::Util.map_hash(
    "red" => 255,
    "green" => 255,
    "blue" => 255,
    "saturation" => 100,
    "lightness" => 100,
    "alpha" => 1
  ) do |name, max|
    val = kwargs.delete(name)
    next unless val
    assert_type val, :Number, name
    assert_unit val, '%', name
    Sass::Util.check_range("$#{name}: Amount", -100..100, val, '%')

    current = color.send(name)
    scale = val.value / 100.0
    diff = scale > 0 ? max - current : current
    [name.to_sym, current + diff * scale]
  end

  unless kwargs.empty?
    name, val = kwargs.to_a.first
    raise ArgumentError.new("Unknown argument $#{name} (#{val})")
  end

  color.with(with)
end

- (Sass::Script::Value::List) selector_append($selectors...)

Return a new selector with all selectors in $selectors appended one another as though they had been nested in the stylesheet as $selector1 { &$selector2 { ... } }.

Examples:

selector-append(".foo", ".bar", ".baz") => .foo.bar.baz
selector-append(".a .foo", ".b .bar") => "a .foo.b .bar"
selector-append(".foo", "-suffix") => ".foo-suffix"

Returns A list of lists of strings representing the result of appending $selectors. This is in the same format as a selector returned by &.

Parameters:

Returns:

  • (Sass::Script::Value::List) —

    A list of lists of strings representing the result of appending $selectors. This is in the same format as a selector returned by &.

Raises:

  • (ArgumentError) —

    if a selector could not be appended.



2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 2446

def selector_append(*selectors)
  if selectors.empty?
    raise ArgumentError.new("$selectors: At least one selector must be passed")
  end

  selectors.map {|sel| parse_selector(sel, :selectors)}.inject do |parent, child|
    child.members.each do |seq|
      sseq = seq.members.first
      unless sseq.is_a?(Sass::Selector::SimpleSequence)
        raise ArgumentError.new("Can't append \"#{seq}\" to \"#{parent}\"")
      end

      base = sseq.base
      case base
      when Sass::Selector::Universal
        raise ArgumentError.new("Can't append \"#{seq}\" to \"#{parent}\"")
      when Sass::Selector::Element
        unless base.namespace.nil?
          raise ArgumentError.new("Can't append \"#{seq}\" to \"#{parent}\"")
        end
        sseq.members[0] = Sass::Selector::Parent.new(base.name)
      else
        sseq.members.unshift Sass::Selector::Parent.new
      end
    end
    child.resolve_parent_refs(parent)
  end.to_sass_script
end

- (Sass::Script::Value::List) selector_extend($selector, $extendee, $extender)

Returns a new version of $selector with $extendee extended with $extender. This works just like the result of

$selector { ... }
$extender { @extend $extendee }

Examples:

selector-extend(".a .b", ".b", ".foo .bar") => .a .b, .a .foo .bar, .foo .a .bar

Returns A list of lists of strings representing the result of the extension. This is in the same format as a selector returned by &.

Parameters:

Returns:

  • (Sass::Script::Value::List) —

    A list of lists of strings representing the result of the extension. This is in the same format as a selector returned by &.

Raises:

  • (ArgumentError) —

    if the extension fails



2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 2503

def selector_extend(selector, extendee, extender)
  selector = parse_selector(selector, :selector)
  extendee = parse_selector(extendee, :extendee)
  extender = parse_selector(extender, :extender)

  extends = Sass::Util::SubsetMap.new
  begin
    extender.populate_extends(extends, extendee)
    selector.do_extend(extends).to_sass_script
  rescue Sass::SyntaxError => e
    raise ArgumentError.new(e.to_s)
  end
end

- (Sass::Script::Value::List) selector_nest($selectors...)

Return a new selector with all selectors in $selectors nested beneath one another as though they had been nested in the stylesheet as $selector1 { $selector2 { ... } }.

Unlike most selector functions, selector-nest allows the parent selector & to be used in any selector but the first.

Examples:

selector-nest(".foo", ".bar", ".baz") => .foo .bar .baz
selector-nest(".a .foo", ".b .bar") => .a .foo .b .bar
selector-nest(".foo", "&.bar") => .foo.bar

Returns A list of lists of strings representing the result of nesting $selectors. This is in the same format as a selector returned by &.

Parameters:

Returns:

  • (Sass::Script::Value::List) —

    A list of lists of strings representing the result of nesting $selectors. This is in the same format as a selector returned by &.



2416
2417
2418
2419
2420
2421
2422
2423
2424
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 2416

def selector_nest(*selectors)
  if selectors.empty?
    raise ArgumentError.new("$selectors: At least one selector must be passed")
  end

  parsed = [parse_selector(selectors.first, :selectors)]
  parsed += selectors[1..-1].map {|sel| parse_selector(sel, :selectors, true)}
  parsed.inject {|result, child| child.resolve_parent_refs(result)}.to_sass_script
end

- (Sass::Script::Value::List) selector_parse($selector)

Parses a user-provided selector into a list of lists of strings as returned by &.

Examples:

selector-parse(".foo .bar, .baz .bang") => ('.foo' '.bar', '.baz' '.bang')

Returns A list of lists of strings representing $selector. This is in the same format as a selector returned by &.

Parameters:

Returns:

  • (Sass::Script::Value::List) —

    A list of lists of strings representing $selector. This is in the same format as a selector returned by &.



2390
2391
2392
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 2390

def selector_parse(selector)
  parse_selector(selector, :selector).to_sass_script
end

- (Sass::Script::Value::List) selector_replace($selector, $original, $replacement)

Replaces all instances of $original with $replacement in $selector

This works by using @extend and throwing away the original selector. This means that it can be used to do very advanced replacements; see the examples below.

Examples:

selector-replace(".foo .bar", ".bar", ".baz") => ".foo .baz"
selector-replace(".foo.bar.baz", ".foo.baz", ".qux") => ".bar.qux"

Returns A list of lists of strings representing the result of the extension. This is in the same format as a selector returned by &.

Parameters:

Returns:

  • (Sass::Script::Value::List) —

    A list of lists of strings representing the result of the extension. This is in the same format as a selector returned by &.

Raises:

  • (ArgumentError) —

    if the replacement fails



2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 2546

def selector_replace(selector, original, replacement)
  selector = parse_selector(selector, :selector)
  original = parse_selector(original, :original)
  replacement = parse_selector(replacement, :replacement)

  extends = Sass::Util::SubsetMap.new
  begin
    replacement.populate_extends(extends, original)
    selector.do_extend(extends, [], true).to_sass_script
  rescue Sass::SyntaxError => e
    raise ArgumentError.new(e.to_s)
  end
end

- (Sass::Script::Value::List, Sass::Script::Value::Null) selector_unify($selector1, $selector2)

Unifies two selectors into a single selector that matches only elements matched by both input selectors. Returns null if there is no such selector.

Like the selector unification done for @extend, this doesn’t guarantee that the output selector will match all elements matched by both input selectors. For example, if .a .b is unified with .x .y, .a .x .b.y, .x .a .b.y will be returned, but .a.x .b.y will not. This avoids exponential output size while matching all elements that are likely to exist in practice.

Examples:

selector-unify(".a", ".b") => .a.b
selector-unify(".a .b", ".x .y") => .a .x .b.y, .x .a .b.y
selector-unify(".a.b", ".b.c") => .a.b.c
selector-unify("#a", "#b") => null

Returns A list of lists of strings representing the result of the unification, or null if no unification exists. This is in the same format as a selector returned by &.

Parameters:

Returns:



2592
2593
2594
2595
2596
2597
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 2592

def selector_unify(selector1, selector2)
  selector1 = parse_selector(selector1, :selector1)
  selector2 = parse_selector(selector2, :selector2)
  return null unless (unified = selector1.unify(selector2))
  unified.to_sass_script
end

- (Sass::Script::Value::List) set

Return a new list, based on the list provided, but with the nth element changed to the value given.

Note that unlike some languages, the first item in a Sass list is number 1, the second number 2, and so forth.

Negative index values address elements in reverse order, starting with the last element in the list.

Examples:

set-nth($list: 10px 20px 30px, $n: 2, $value: -20px) => 10px -20px 30px

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $n isn’t an integer between 1 and the length of $list



1851
1852
1853
1854
1855
1856
1857
1858
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1851

def set_nth(list, n, value)
  assert_type n, :Number, :n
  Sass::Script::Value::List.assert_valid_index(list, n)
  index = n.to_i > 0 ? n.to_i - 1 : n.to_i
  new_list = list.to_a.dup
  new_list[index] = value
  Sass::Script::Value::List.new(new_list, list.separator)
end

- (Sass::Script::Value::List) simple_selectors($selector)

Returns the simple selectors that comprise the compound selector $selector.

Note that $selector must be a compound selector. That means it cannot contain commas or spaces. It also means that unlike other selector functions, this takes only strings, not lists.

Examples:

simple-selectors(".foo.bar") => ".foo", ".bar"
simple-selectors(".foo.bar.baz") => ".foo", ".bar", ".baz"

Returns A list of simple selectors in the compound selector.

Parameters:

Returns:



2619
2620
2621
2622
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 2619

def simple_selectors(selector)
  selector = parse_compound_selector(selector, :selector)
  list(selector.members.map {|simple| unquoted_string(simple.to_s)}, :comma)
end

- (Sass::Script::Value::Number, Sass::Script::Value::Null) str_index($string, $substring)

Returns the index of the first occurrence of $substring in $string. If there is no such occurrence, returns null.

Note that unlike some languages, the first character in a Sass string is number 1, the second number 2, and so forth.

Examples:

str-index(abcd, a)  => 1
str-index(abcd, ab) => 1
str-index(abcd, X)  => null
str-index(abcd, c)  => 3

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if any parameter is the wrong type



1525
1526
1527
1528
1529
1530
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1525

def str_index(string, substring)
  assert_type string, :String, :string
  assert_type substring, :String, :substring
  index = string.value.index(substring.value)
  index ? number(index + 1) : null
end

- (Sass::Script::Value::String) str_insert($string, $insert, $index)

Inserts $insert into $string at $index.

Note that unlike some languages, the first character in a Sass string is number 1, the second number 2, and so forth.

Examples:

str-insert("abcd", "X", 1) => "Xabcd"
str-insert("abcd", "X", 4) => "abcXd"
str-insert("abcd", "X", 5) => "abcdX"

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if any parameter is the wrong type



1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1493

def str_insert(original, insert, index)
  assert_type original, :String, :string
  assert_type insert, :String, :insert
  assert_integer index, :index
  assert_unit index, nil, :index
  insertion_point = if index.to_i > 0
                      [index.to_i - 1, original.value.size].min
                    else
                      [index.to_i, -original.value.size - 1].max
                    end
  result = original.value.dup.insert(insertion_point, insert.value)
  Sass::Script::Value::String.new(result, original.type)
end

- (Sass::Script::Value::Number) str_length($string)

Returns the number of characters in a string.

Examples:

str-length("foo") => 3

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $string isn’t a string



1467
1468
1469
1470
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1467

def str_length(string)
  assert_type string, :String, :string
  number(string.value.size)
end

- (Sass::Script::Value::String) str_slice($string, $start-at, $end-at:-1)

Extracts a substring from $string. The substring will begin at index $start-at and ends at index $end-at.

Note that unlike some languages, the first character in a Sass string is number 1, the second number 2, and so forth.

Examples:

str-slice("abcd", 2, 3)   => "bc"
str-slice("abcd", 2)      => "bcd"
str-slice("abcd", -3, -2) => "bc"
str-slice("abcd", 2, -2)  => "bc"

Returns The substring. This will be quoted if and only if $string was quoted

Parameters:

  • $start-at (Sass::Script::Value::Number) —

    The index of the first character of the substring. If this is negative, it counts from the end of $string

  • $end-before (Sass::Script::Value::Number) —

    The index of the last character of the substring. If this is negative, it counts from the end of $string. Defaults to -1

Returns:

Raises:

  • (ArgumentError) —

    if any parameter is the wrong type



1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1555

def str_slice(string, start_at, end_at = nil)
  assert_type string, :String, :string
  assert_unit start_at, nil, "start-at"

  end_at = number(-1) if end_at.nil?
  assert_unit end_at, nil, "end-at"

  return Sass::Script::Value::String.new("", string.type) if end_at.value == 0
  s = start_at.value > 0 ? start_at.value - 1 : start_at.value
  e = end_at.value > 0 ? end_at.value - 1 : end_at.value
  s = string.value.length + s if s < 0
  s = 0 if s < 0
  e = string.value.length + e if e < 0
  e = 0 if s < 0
  extracted = string.value.slice(s..e)
  Sass::Script::Value::String.new(extracted || "", string.type)
end

- (Sass::Script::Value::String) to_lower_case($string)

Convert a string to lower case,

Examples:

to-lower-case(ABCD) => abcd

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $string isn’t a string



1599
1600
1601
1602
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1599

def to_lower_case(string)
  assert_type string, :String, :string
  Sass::Script::Value::String.new(string.value.downcase, string.type)
end

- (Sass::Script::Value::String) to_upper_case($string)

Converts a string to upper case.

Examples:

to-upper-case(abcd) => ABCD

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $string isn’t a string



1584
1585
1586
1587
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1584

def to_upper_case(string)
  assert_type string, :String, :string
  Sass::Script::Value::String.new(string.value.upcase, string.type)
end

- (Sass::Script::Value::Color) transparentize($color, $amount) Also known as: fade_out

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

Examples:

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 $amount is out of bounds, or either parameter is the wrong type

See Also:



966
967
968
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 966

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

- (Sass::Script::Value::String) type_of($value)

Returns the type of a value.

Examples:

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:

Returns:



1618
1619
1620
1621
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1618

def type_of(value)
  value.check_deprecated_interp if value.is_a?(Sass::Script::Value::String)
  identifier(value.class.name.gsub(/Sass::Script::Value::/, '').downcase)
end

- (Sass::Script::Value::String) unique_id

Returns a unique CSS identifier. The identifier is returned as an unquoted string. The identifier returned is only guaranteed to be unique within the scope of a single Sass run.

Returns:



2194
2195
2196
2197
2198
2199
2200
2201
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 2194

def unique_id
  generator = Sass::Script::Functions.random_number_generator
  Thread.current[:sass_last_unique_id] ||= generator.rand(36**8)
  # avoid the temptation of trying to guess the next unique value.
  value = (Thread.current[:sass_last_unique_id] += (generator.rand(10) + 1))
  # the u makes this a legal identifier if it would otherwise start with a number.
  identifier("u" + value.to_s(36).rjust(8, '0'))
end

- (Sass::Script::Value::String) unit($number)

Returns the unit(s) associated with a number. Complex units are sorted in alphabetical order by numerator and denominator.

Examples:

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

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $number isn’t a number



1669
1670
1671
1672
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1669

def unit(number)
  assert_type number, :Number, :number
  quoted_string(number.unit_str)
end

- (Sass::Script::Value::Bool) unitless($number)

Returns whether a number has units.

Examples:

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

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $number isn’t a number



1684
1685
1686
1687
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1684

def unitless(number)
  assert_type number, :Number, :number
  bool(number.unitless?)
end

- (Sass::Script::Value::String) unquote($string)

Removes quotes from a string. If the string is already unquoted, this will return it unmodified.

Examples:

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

Parameters:

Returns:

Raises:

  • (ArgumentError) —

    if $string isn’t a string

See Also:



1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1413

def unquote(string)
  unless string.is_a?(Sass::Script::Value::String)
    # Don't warn multiple times for the same source line.
    # rubocop:disable GlobalVars
    $_sass_warned_for_unquote ||= Set.new
    frame = environment.stack.frames.last
    key = [frame.filename, frame.line] if frame
    return string if frame && $_sass_warned_for_unquote.include?(key)
    $_sass_warned_for_unquote << key if frame
    # rubocop:enable GlobalVars

    Sass::Util.sass_warn(<<MESSAGE.strip)
DEPRECATION WARNING: Passing #{string.to_sass}, a non-string value, to unquote()
will be an error in future versions of Sass.
#{environment.stack.to_s.gsub(/^/, ' ' * 8)}
MESSAGE
    return string
  end

  string.check_deprecated_interp
  return string if string.type == :identifier
  identifier(string.value)
end

- (Sass::Script::Value::Bool) variable_exists($name)

Check whether a variable with the given name exists in the current scope or in the global scope.

Examples:

$a-false-value: false;
variable-exists(a-false-value) => true

variable-exists(nonexistent) => false

Parameters:

Returns:



2274
2275
2276
2277
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 2274

def variable_exists(name)
  assert_type name, :String, :name
  bool(environment.caller.var(name.value))
end

- (Sass::Script::Value::List) zip($lists...)

Combines several lists into a single multidimensional list. The nth value of the resulting list is a space separated list of the source lists’ nth values.

The length of the resulting list is the length of the shortest list.

Examples:

zip(1px 1px 3px, solid dashed solid, red green blue)
=> 1px solid red, 1px dashed green, 3px solid blue

Parameters:

Returns:



1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
 
# File '/Users/ceppstei/Projects/sass-lang/.sass/lib/sass/script/functions.rb', line 1978

def zip(*lists)
  length = nil
  values = []
  lists.each do |list|
    array = list.to_a
    values << array.dup
    length = length.nil? ? array.length : [length, array.length].min
  end
  values.each do |value|
    value.slice!(length)
  end
  new_list_value = values.first.zip(*values[1..-1])
  list(new_list_value.map {|list| list(list, :space)}, :comma)
end