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require 'sass/script/value/helpers'
module Sass::Script
# @comment
# YARD can't handle some multiline tags, and we need really long tags for function declarations.
# rubocop:disable LineLength
# Methods in this module are accessible from the SassScript context.
# For example, you can write
#
# $color: hsl(120deg, 100%, 50%)
#
# and it will call {Functions#hsl}.
#
# The following functions are provided:
#
# *Note: These functions are described in more detail below.*
#
# ## RGB Functions
#
# \{#rgb rgb($red, $green, $blue)}
# : Creates a {Sass::Script::Value::Color Color} from red, green, and blue
# values.
#
# \{#rgba rgba($red, $green, $blue, $alpha)}
# : Creates a {Sass::Script::Value::Color Color} from red, green, blue, and
# alpha values.
#
# \{#red red($color)}
# : Gets the red component of a color.
#
# \{#green green($color)}
# : Gets the green component of a color.
#
# \{#blue blue($color)}
# : Gets the blue component of a color.
#
# \{#mix mix($color1, $color2, \[$weight\])}
# : Mixes two colors together.
#
# ## HSL Functions
#
# \{#hsl hsl($hue, $saturation, $lightness)}
# : Creates a {Sass::Script::Value::Color Color} from hue, saturation, and
# lightness values.
#
# \{#hsla hsla($hue, $saturation, $lightness, $alpha)}
# : Creates a {Sass::Script::Value::Color Color} from hue, saturation,
# lightness, and alpha values.
#
# \{#hue hue($color)}
# : Gets the hue component of a color.
#
# \{#saturation saturation($color)}
# : Gets the saturation component of a color.
#
# \{#lightness lightness($color)}
# : Gets the lightness component of a color.
#
# \{#adjust_hue adjust-hue($color, $degrees)}
# : Changes the hue of a color.
#
# \{#lighten lighten($color, $amount)}
# : Makes a color lighter.
#
# \{#darken darken($color, $amount)}
# : Makes a color darker.
#
# \{#saturate saturate($color, $amount)}
# : Makes a color more saturated.
#
# \{#desaturate desaturate($color, $amount)}
# : Makes a color less saturated.
#
# \{#grayscale grayscale($color)}
# : Converts a color to grayscale.
#
# \{#complement complement($color)}
# : Returns the complement of a color.
#
# \{#invert invert($color, \[$weight\])}
# : Returns the inverse of a color.
#
# ## Opacity Functions
#
# \{#alpha alpha($color)} / \{#opacity opacity($color)}
# : Gets the alpha component (opacity) of a color.
#
# \{#rgba rgba($color, $alpha)}
# : Changes the alpha component for a color.
#
# \{#opacify opacify($color, $amount)} / \{#fade_in fade-in($color, $amount)}
# : Makes a color more opaque.
#
# \{#transparentize transparentize($color, $amount)} / \{#fade_out fade-out($color, $amount)}
# : Makes a color more transparent.
#
# ## Other Color Functions
#
# \{#adjust_color adjust-color($color, \[$red\], \[$green\], \[$blue\], \[$hue\], \[$saturation\], \[$lightness\], \[$alpha\])}
# : Increases or decreases one or more components of a color.
#
# \{#scale_color scale-color($color, \[$red\], \[$green\], \[$blue\], \[$saturation\], \[$lightness\], \[$alpha\])}
# : Fluidly scales one or more properties of a color.
#
# \{#change_color change-color($color, \[$red\], \[$green\], \[$blue\], \[$hue\], \[$saturation\], \[$lightness\], \[$alpha\])}
# : Changes one or more properties of a color.
#
# \{#ie_hex_str ie-hex-str($color)}
# : Converts a color into the format understood by IE filters.
#
# ## String Functions
#
# \{#unquote unquote($string)}
# : Removes quotes from a string.
#
# \{#quote quote($string)}
# : Adds quotes to a string.
#
# \{#str_length str-length($string)}
# : Returns the number of characters in a string.
#
# \{#str_insert str-insert($string, $insert, $index)}
# : Inserts `$insert` into `$string` at `$index`.
#
# \{#str_index str-index($string, $substring)}
# : Returns the index of the first occurrence of `$substring` in `$string`.
#
# \{#str_slice str-slice($string, $start-at, [$end-at])}
# : Extracts a substring from `$string`.
#
# \{#to_upper_case to-upper-case($string)}
# : Converts a string to upper case.
#
# \{#to_lower_case to-lower-case($string)}
# : Converts a string to lower case.
#
# ## Number Functions
#
# \{#percentage percentage($number)}
# : Converts a unitless number to a percentage.
#
# \{#round round($number)}
# : Rounds a number to the nearest whole number.
#
# \{#ceil ceil($number)}
# : Rounds a number up to the next whole number.
#
# \{#floor floor($number)}
# : Rounds a number down to the previous whole number.
#
# \{#abs abs($number)}
# : Returns the absolute value of a number.
#
# \{#min min($numbers...)\}
# : Finds the minimum of several numbers.
#
# \{#max max($numbers...)\}
# : Finds the maximum of several numbers.
#
# \{#random random([$limit])\}
# : Returns a random number.
#
# ## List Functions {#list-functions}
#
# Lists in Sass are immutable; all list functions return a new list rather
# than updating the existing list in-place.
#
# All list functions work for maps as well, treating them as lists of pairs.
#
# \{#length length($list)}
# : Returns the length of a list.
#
# \{#nth nth($list, $n)}
# : Returns a specific item in a list.
#
# \{#set-nth set-nth($list, $n, $value)}
# : Replaces the nth item in a list.
#
# \{#join join($list1, $list2, \[$separator, $bracketed\])}
# : Joins together two lists into one.
#
# \{#append append($list1, $val, \[$separator\])}
# : Appends a single value onto the end of a list.
#
# \{#zip zip($lists...)}
# : Combines several lists into a single multidimensional list.
#
# \{#index index($list, $value)}
# : Returns the position of a value within a list.
#
# \{#list_separator list-separator($list)}
# : Returns the separator of a list.
#
# \{#is_bracketed is-bracketed($list)}
# : Returns whether a list has square brackets.
#
# ## Map Functions {#map-functions}
#
# Maps in Sass are immutable; all map functions return a new map rather than
# updating the existing map in-place.
#
# \{#map_get map-get($map, $key)}
# : Returns the value in a map associated with a given key.
#
# \{#map_merge map-merge($map1, $map2)}
# : Merges two maps together into a new map.
#
# \{#map_remove map-remove($map, $keys...)}
# : Returns a new map with keys removed.
#
# \{#map_keys map-keys($map)}
# : Returns a list of all keys in a map.
#
# \{#map_values map-values($map)}
# : Returns a list of all values in a map.
#
# \{#map_has_key map-has-key($map, $key)}
# : Returns whether a map has a value associated with a given key.
#
# \{#keywords keywords($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 selector-nest($selectors...)}
# : Nests selector beneath one another like they would be nested in the
# stylesheet.
#
# \{#selector_append selector-append($selectors...)}
# : Appends selectors to one another without spaces in between.
#
# \{#selector_extend selector-extend($selector, $extendee, $extender)}
# : Extends `$extendee` with `$extender` within `$selector`.
#
# \{#selector_replace selector-replace($selector, $original, $replacement)}
# : Replaces `$original` with `$replacement` within `$selector`.
#
# \{#selector_unify selector-unify($selector1, $selector2)}
# : Unifies two selectors to produce a selector that matches
# elements matched by both.
#
# \{#is_superselector is-superselector($super, $sub)}
# : Returns whether `$super` matches all the elements `$sub` does, and
# possibly more.
#
# \{#simple_selectors simple-selectors($selector)}
# : Returns the simple selectors that comprise a compound selector.
#
# \{#selector_parse selector-parse($selector)}
# : Parses a selector into the format returned by `&`.
#
# ## Introspection Functions
#
# \{#feature_exists feature-exists($feature)}
# : Returns whether a feature exists in the current Sass runtime.
#
# \{#variable_exists variable-exists($name)}
# : Returns whether a variable with the given name exists in the current scope.
#
# \{#global_variable_exists global-variable-exists($name)}
# : Returns whether a variable with the given name exists in the global scope.
#
# \{#function_exists function-exists($name)}
# : Returns whether a function with the given name exists.
#
# \{#mixin_exists mixin-exists($name)}
# : Returns whether a mixin with the given name exists.
#
# \{#content_exists content-exists()}
# : Returns whether the current mixin was passed a content block.
#
# \{#inspect inspect($value)}
# : Returns the string representation of a value as it would be represented in Sass.
#
# \{#type_of type-of($value)}
# : Returns the type of a value.
#
# \{#unit unit($number)}
# : Returns the unit(s) associated with a number.
#
# \{#unitless unitless($number)}
# : Returns whether a number has units.
#
# \{#comparable comparable($number1, $number2)}
# : Returns whether two numbers can be added, subtracted, or compared.
#
# \{#call call($function, $args...)}
# : Dynamically calls a Sass function reference returned by `get-function`.
#
# \{#get_function get-function($name, $css: false)}
# : Looks up a function with the given name in the current lexical scope
# and returns a reference to it.
#
# ## Miscellaneous Functions
#
# \{#if if($condition, $if-true, $if-false)}
# : Returns one of two values, depending on whether or not `$condition` is
# true.
#
# \{#unique_id 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 {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.
# {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::Base#value value} accessor for getting
# their Ruby values. Color objects, though, must be accessed using
# {Sass::Script::Value::Color#rgb rgb}, {Sass::Script::Value::Color#red red},
# {Sass::Script::Value::Color#blue green}, or {Sass::Script::Value::Color#blue
# 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 {Sass::Engine} to render the code,
# using the {file:SASS_REFERENCE.md#custom-option `options` parameter}
# to pass in data that {EvaluationContext#options 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 {Value::Base#to_s #to_s} (or other methods that use the string
# representation) on those objects without first setting {Tree::Node#options=
# the #options attribute}.
#
# @comment
# rubocop:enable LineLength
# rubocop:disable ModuleLength
module Functions
@signatures = {}
# A class representing a Sass function signature.
#
# @attr args [Array<String>] The names of the arguments to the function.
# @attr delayed_args [Array<String>] The names of the arguments whose evaluation should be
# delayed.
# @attr var_args [Boolean] Whether the function takes a variable number of arguments.
# @attr var_kwargs [Boolean] Whether the function takes an arbitrary set of keyword arguments.
Signature = Struct.new(:args, :delayed_args, :var_args, :var_kwargs, :deprecated)
# 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.
#
# @example
# 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
#
# @param method_name [Symbol] The name of the method
# whose signature is being declared.
# @param args [Array<Symbol>] The names of the arguments for the function signature.
# @option options :var_args [Boolean] (false)
# Whether the function accepts a variable number of (unnamed) arguments
# in addition to the named arguments.
# @option options :var_kwargs [Boolean] (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 {Value}s 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.
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
# 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.
#
# @param method_name [Symbol] The name of the Ruby function to be called.
# @param arg_arity [Integer] The number of unnamed arguments the function was passed.
# @param kwarg_arity [Integer] The number of keyword arguments the function was passed.
#
# @return [{Symbol => Object}, nil]
# The signature options for the matching signature,
# or nil if no signatures are declared for this function. See {declare}.
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
# 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.
#
# @param seed [Integer]
# @return [Integer] The same seed.
def self.random_seed=(seed)
@random_number_generator = Random.new(seed)
end
# Get Sass's internal random number generator.
#
# @return [Random]
def self.random_number_generator
@random_number_generator ||= Random.new
end
# The context in which methods in {Script::Functions} are evaluated.
# That means that all instance methods of {EvaluationContext}
# are available to use in functions.
class EvaluationContext
include Functions
include Value::Helpers
# The human-readable names for [Sass::Script::Value::Base]. The default is
# just the downcased name of the type.
TYPE_NAMES = {:ArgList => 'variable argument list'}
# The environment for this function. This environment's
# {Environment#parent} is the global environment, and its
# {Environment#caller} is a read-only view of the local environment of the
# caller of this function.
#
# @return [Environment]
attr_reader :environment
# The options hash for the {Sass::Engine} that is processing the function call
#
# @return [{Symbol => Object}]
attr_reader :options
# @param environment [Environment] See \{#environment}
def initialize(environment)
@environment = environment
@options = environment.options
end
# Asserts that the type of a given SassScript value
# is the expected type (designated by a symbol).
#
# Valid types are `:Bool`, `:Color`, `:Number`, and `:String`.
# Note that `:String` will match both double-quoted strings
# and unquoted identifiers.
#
# @example
# assert_type value, :String
# assert_type value, :Number
# @param value [Sass::Script::Value::Base] A SassScript value
# @param type [Symbol, Array<Symbol>] The name(s) of the type the value is expected to be
# @param name [String, Symbol, nil] The name of the argument.
# @raise [ArgumentError] if value is not of the correct type.
def assert_type(value, type, name = nil)
valid_types = Array(type)
found_type = valid_types.find do |t|
value.is_a?(Sass::Script::Value.const_get(t)) ||
t == :Map && value.is_a?(Sass::Script::Value::List) && value.value.empty?
end
return if found_type
err = if valid_types.size == 1
"#{value.inspect} is not a #{TYPE_NAMES[type] || type.to_s.downcase}"
else
type_names = valid_types.map {|t| TYPE_NAMES[t] || t.to_s.downcase}
"#{value.inspect} is not any of #{type_names.join(', ')}"
end
err = "$#{name.to_s.tr('_', '-')}: " + err if name
raise ArgumentError.new(err)
end
# Asserts that the unit of the number is as expected.
#
# @example
# assert_unit number, "px"
# assert_unit number, nil
# @param number [Sass::Script::Value::Number] The number to be validated.
# @param unit [::String]
# The unit that the number must have.
# If nil, the number must be unitless.
# @param name [::String] The name of the parameter being validated.
# @raise [ArgumentError] if number is not of the correct unit or is not a number.
def assert_unit(number, unit, name = nil)
assert_type number, :Number, name
return if number.is_unit?(unit)
expectation = unit ? "have a unit of #{unit}" : "be unitless"
if name
raise ArgumentError.new("Expected $#{name} to #{expectation} but got #{number}")
else
raise ArgumentError.new("Expected #{number} to #{expectation}")
end
end
# Asserts that the value is an integer.
#
# @example
# assert_integer 2px
# assert_integer 2.5px
# => SyntaxError: "Expected 2.5px to be an integer"
# assert_integer 2.5px, "width"
# => SyntaxError: "Expected width to be an integer but got 2.5px"
# @param number [Sass::Script::Value::Base] The value to be validated.
# @param name [::String] The name of the parameter being validated.
# @raise [ArgumentError] if number is not an integer or is not a number.
def assert_integer(number, name = nil)
assert_type number, :Number, name
return if number.int?
if name
raise ArgumentError.new("Expected $#{name} to be an integer but got #{number}")
else
raise ArgumentError.new("Expected #{number} to be an integer")
end
end
# Performs a node that has been delayed for execution.
#
# @private
# @param node [Sass::Script::Tree::Node,
# Sass::Script::Value::Base] When this is a tree node, it's
# performed in the caller's environment. When it's a value
# (which can happen when the value had to be performed already
# -- like for a splat), it's returned as-is.
# @param env [Sass::Environment] The environment within which to perform the node.
# Defaults to the (read-only) environment of the caller.
def perform(node, env = environment.caller)
if node.is_a?(Sass::Script::Value::Base)
node
else
node.perform(env)
end
end
end
class << self
# Returns whether user function with a given name exists.
#
# @param function_name [String]
# @return [Boolean]
alias_method :callable?, :public_method_defined?
private
def include(*args)
r = super
# We have to re-include ourselves into EvaluationContext to work around
# an icky Ruby restriction.
EvaluationContext.send :include, self
r
end
end
# Creates a {Sass::Script::Value::Color Color} object from red, green, and
# blue values.
#
# @see #rgba
# @overload rgb($red, $green, $blue)
# @param $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
# @param $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
# @param $blue [Sass::Script::Value::Number] The amount of blue in the
# color. Must be between 0 and 255 inclusive, or between `0%` and `100%`
# inclusive
# @return [Sass::Script::Value::Color]
# @raise [ArgumentError] if any parameter is the wrong type or out of bounds
def rgb(red, green, blue)
if special_number?(red) || special_number?(green) || special_number?(blue)
return unquoted_string("rgb(#{red}, #{green}, #{blue})")
end
assert_type red, :Number, :red
assert_type green, :Number, :green
assert_type blue, :Number, :blue
color_attrs = [red, green, blue].map do |c|
if c.is_unit?("%")
c.value * 255 / 100.0
elsif c.unitless?
c.value
else
raise ArgumentError.new("Expected #{c} to be unitless or have a unit of % but got #{c}")
end
end
# Don't store the string representation for function-created colors, both
# because it's not very useful and because some functions aren't supported
# on older browsers.
Sass::Script::Value::Color.new(color_attrs)
end
declare :rgb, [:red, :green, :blue]
# Creates a {Sass::Script::Value::Color Color} from red, green, blue, and
# alpha values.
# @see #rgb
#
# @overload rgba($red, $green, $blue, $alpha)
# @param $red [Sass::Script::Value::Number] The amount of red in the
# color. Must be between 0 and 255 inclusive or 0% and 100% inclusive
# @param $green [Sass::Script::Value::Number] The amount of green in the
# color. Must be between 0 and 255 inclusive or 0% and 100% inclusive
# @param $blue [Sass::Script::Value::Number] The amount of blue in the
# color. Must be between 0 and 255 inclusive or 0% and 100% inclusive
# @param $alpha [Sass::Script::Value::Number] The opacity of the color.
# Must be between 0 and 1 inclusive
# @return [Sass::Script::Value::Color]
# @raise [ArgumentError] if any parameter is the wrong type or out of
# bounds
#
# @overload rgba($color, $alpha)
# Sets the opacity of an existing color.
#
# @example
# rgba(#102030, 0.5) => rgba(16, 32, 48, 0.5)
# rgba(blue, 0.2) => rgba(0, 0, 255, 0.2)
#
# @param $color [Sass::Script::Value::Color] The color whose opacity will
# be changed.
# @param $alpha [Sass::Script::Value::Number] The new opacity of the
# color. Must be between 0 and 1 inclusive
# @return [Sass::Script::Value::Color]
# @raise [ArgumentError] if `$alpha` is out of bounds or either parameter
# is the wrong type
def rgba(*args)
case args.size
when 2
color, alpha = args
assert_type color, :Color, :color
if special_number?(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 special_number?(red) || special_number?(green) ||
special_number?(blue) || special_number?(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
declare :rgba, [:red, :green, :blue, :alpha]
declare :rgba, [:color, :alpha]
# Creates a {Sass::Script::Value::Color Color} from hue, saturation, and
# lightness values. Uses the algorithm from the [CSS3 spec][].
#
# [CSS3 spec]: http://www.w3.org/TR/css3-color/#hsl-color
#
# @see #hsla
# @overload hsl($hue, $saturation, $lightness)
# @param $hue [Sass::Script::Value::Number] The hue of the color. Should be
# between 0 and 360 degrees, inclusive
# @param $saturation [Sass::Script::Value::Number] The saturation of the
# color. Must be between `0%` and `100%`, inclusive
# @param $lightness [Sass::Script::Value::Number] The lightness of the
# color. Must be between `0%` and `100%`, inclusive
# @return [Sass::Script::Value::Color]
# @raise [ArgumentError] if `$saturation` or `$lightness` are out of bounds
# or any parameter is the wrong type
def hsl(hue, saturation, lightness)
if special_number?(hue) || special_number?(saturation) || special_number?(lightness)
unquoted_string("hsl(#{hue}, #{saturation}, #{lightness})")
else
hsla(hue, saturation, lightness, number(1))
end
end
declare :hsl, [:hue, :saturation, :lightness]
# Creates a {Sass::Script::Value::Color Color} from hue,
# saturation, lightness, and alpha values. Uses the algorithm from
# the [CSS3 spec][].
#
# [CSS3 spec]: http://www.w3.org/TR/css3-color/#hsl-color
#
# @see #hsl
# @overload hsla($hue, $saturation, $lightness, $alpha)
# @param $hue [Sass::Script::Value::Number] The hue of the color. Should be
# between 0 and 360 degrees, inclusive
# @param $saturation [Sass::Script::Value::Number] The saturation of the
# color. Must be between `0%` and `100%`, inclusive
# @param $lightness [Sass::Script::Value::Number] The lightness of the
# color. Must be between `0%` and `100%`, inclusive
# @param $alpha [Sass::Script::Value::Number] The opacity of the color. Must
# be between 0 and 1, inclusive
# @return [Sass::Script::Value::Color]
# @raise [ArgumentError] if `$saturation`, `$lightness`, or `$alpha` are out
# of bounds or any parameter is the wrong type
def hsla(hue, saturation, lightness, alpha)
if special_number?(hue) || special_number?(saturation) ||
special_number?(lightness) || special_number?(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
declare :hsla, [:hue, :saturation, :lightness, :alpha]
# Gets the red component of a color. Calculated from HSL where necessary via
# [this algorithm][hsl-to-rgb].
#
# [hsl-to-rgb]: http://www.w3.org/TR/css3-color/#hsl-color
#
# @overload red($color)
# @param $color [Sass::Script::Value::Color]
# @return [Sass::Script::Value::Number] The red component, between 0 and 255
# inclusive
# @raise [ArgumentError] if `$color` isn't a color
def red(color)
assert_type color, :Color, :color
number(color.red)
end
declare :red, [:color]
# Gets the green component of a color. Calculated from HSL where necessary
# via [this algorithm][hsl-to-rgb].
#
# [hsl-to-rgb]: http://www.w3.org/TR/css3-color/#hsl-color
#
# @overload green($color)
# @param $color [Sass::Script::Value::Color]
# @return [Sass::Script::Value::Number] The green component, between 0 and
# 255 inclusive
# @raise [ArgumentError] if `$color` isn't a color
def green(color)
assert_type color, :Color, :color
number(color.green)
end
declare :green, [:color]
# Gets the blue component of a color. Calculated from HSL where necessary
# via [this algorithm][hsl-to-rgb].
#
# [hsl-to-rgb]: http://www.w3.org/TR/css3-color/#hsl-color
#
# @overload blue($color)
# @param $color [Sass::Script::Value::Color]
# @return [Sass::Script::Value::Number] The blue component, between 0 and
# 255 inclusive
# @raise [ArgumentError] if `$color` isn't a color
def blue(color)
assert_type color, :Color, :color
number(color.blue)
end
declare :blue, [:color]
# Returns the hue component of a color. See [the CSS3 HSL
# specification][hsl]. Calculated from RGB where necessary via [this
# algorithm][rgb-to-hsl].
#
# [hsl]: http://en.wikipedia.org/wiki/HSL_and_HSV#Conversion_from_RGB_to_HSL_or_HSV
# [rgb-to-hsl]: http://en.wikipedia.org/wiki/HSL_and_HSV#Conversion_from_RGB_to_HSL_or_HSV
#
# @overload hue($color)
# @param $color [Sass::Script::Value::Color]
# @return [Sass::Script::Value::Number] The hue component, between 0deg and
# 360deg
# @raise [ArgumentError] if `$color` isn't a color
def hue(color)
assert_type color, :Color, :color
number(color.hue, "deg")
end
declare :hue, [:color]
# Returns the saturation component of a color. See [the CSS3 HSL
# specification][hsl]. Calculated from RGB where necessary via [this
# algorithm][rgb-to-hsl].
#
# [hsl]: http://en.wikipedia.org/wiki/HSL_and_HSV#Conversion_from_RGB_to_HSL_or_HSV
# [rgb-to-hsl]: http://en.wikipedia.org/wiki/HSL_and_HSV#Conversion_from_RGB_to_HSL_or_HSV
#
# @overload saturation($color)
# @param $color [Sass::Script::Value::Color]
# @return [Sass::Script::Value::Number] The saturation component, between 0%
# and 100%
# @raise [ArgumentError] if `$color` isn't a color
def saturation(color)
assert_type color, :Color, :color
number(color.saturation, "%")
end
declare :saturation, [:color]
# Returns the lightness component of a color. See [the CSS3 HSL
# specification][hsl]. Calculated from RGB where necessary via [this
# algorithm][rgb-to-hsl].
#
# [hsl]: http://en.wikipedia.org/wiki/HSL_and_HSV#Conversion_from_RGB_to_HSL_or_HSV
# [rgb-to-hsl]: http://en.wikipedia.org/wiki/HSL_and_HSV#Conversion_from_RGB_to_HSL_or_HSV
#
# @overload lightness($color)
# @param $color [Sass::Script::Value::Color]
# @return [Sass::Script::Value::Number] The lightness component, between 0%
# and 100%
# @raise [ArgumentError] if `$color` isn't a color
def lightness(color)
assert_type color, :Color, :color
number(color.lightness, "%")
end
declare :lightness, [: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.
#
# @overload alpha($color)
# @param $color [Sass::Script::Value::Color]
# @return [Sass::Script::Value::Number] The alpha component, between 0 and 1
# @raise [ArgumentError] if `$color` isn't a color
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
declare :alpha, [:color]
# Returns the alpha component (opacity) of a color. This is 1 unless
# otherwise specified.
#
# @overload opacity($color)
# @param $color [Sass::Script::Value::Color]
# @return [Sass::Script::Value::Number] The alpha component, between 0 and 1
# @raise [ArgumentError] if `$color` isn't a color
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
declare :opacity, [:color]
# 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.
#
# @see #transparentize
# @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
# @overload opacify($color, $amount)
# @param $color [Sass::Script::Value::Color]
# @param $amount [Sass::Script::Value::Number] The amount to increase the
# opacity by, between 0 and 1
# @return [Sass::Script::Value::Color]
# @raise [ArgumentError] if `$amount` is out of bounds, or either parameter
# is the wrong type
def opacify(color, amount)
_adjust(color, amount, :alpha, 0..1, :+)
end
declare :opacify, [:color, :amount]
alias_method :fade_in, :opacify
declare :fade_in, [:color, :amount]
# 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.
#
# @see #opacify
# @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)
# @overload transparentize($color, $amount)
# @param $color [Sass::Script::Value::Color]
# @param $amount [Sass::Script::Value::Number] The amount to decrease the
# opacity by, between 0 and 1
# @return [Sass::Script::Value::Color]
# @raise [ArgumentError] if `$amount` is out of bounds, or either parameter
# is the wrong type
def transparentize(color, amount)
_adjust(color, amount, :alpha, 0..1, :-)
end
declare :transparentize, [:color, :amount]
alias_method :fade_out, :transparentize
declare :fade_out, [: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.
#
# @see #darken
# @example
# lighten(hsl(0, 0%, 0%), 30%) => hsl(0, 0, 30)
# lighten(#800, 20%) => #e00
# @overload lighten($color, $amount)
# @param $color [Sass::Script::Value::Color]
# @param $amount [Sass::Script::Value::Number] The amount to increase the
# lightness by, between `0%` and `100%`
# @return [Sass::Script::Value::Color]
# @raise [ArgumentError] if `$amount` is out of bounds, or either parameter
# is the wrong type
def lighten(color, amount)
_adjust(color, amount, :lightness, 0..100, :+, "%")
end
declare :lighten, [: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.
#
# @see #lighten
# @example
# darken(hsl(25, 100%, 80%), 30%) => hsl(25, 100%, 50%)
# darken(#800, 20%) => #200
# @overload darken($color, $amount)
# @param $color [Sass::Script::Value::Color]
# @param $amount [Sass::Script::Value::Number] The amount to decrease the
# lightness by, between `0%` and `100%`
# @return [Sass::Script::Value::Color]
# @raise [ArgumentError] if `$amount` is out of bounds, or either parameter
# is the wrong type
def darken(color, amount)
_adjust(color, amount, :lightness, 0..100, :-, "%")
end
declare :darken, [: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.
#
# @see #desaturate
# @example
# saturate(hsl(120, 30%, 90%), 20%) => hsl(120, 50%, 90%)
# saturate(#855, 20%) => #9e3f3f
# @overload saturate($color, $amount)
# @param $color [Sass::Script::Value::Color]
# @param $amount [Sass::Script::Value::Number] The amount to increase the
# saturation by, between `0%` and `100%`
# @return [Sass::Script::Value::Color]
# @raise [ArgumentError] if `$amount` is out of bounds, or either parameter
# is the wrong type
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
declare :saturate, [:color, :amount]
declare :saturate, [: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.
#
# @see #saturate
# @example
# desaturate(hsl(120, 30%, 90%), 20%) => hsl(120, 10%, 90%)
# desaturate(#855, 20%) => #726b6b
# @overload desaturate($color, $amount)
# @param $color [Sass::Script::Value::Color]
# @param $amount [Sass::Script::Value::Number] The amount to decrease the
# saturation by, between `0%` and `100%`
# @return [Sass::Script::Value::Color]
# @raise [ArgumentError] if `$amount` is out of bounds, or either parameter
# is the wrong type
def desaturate(color, amount)
_adjust(color, amount, :saturation, 0..100, :-, "%")
end
declare :desaturate, [:color, :amount]
# 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.
#
# @example
# 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
# @overload adjust_hue($color, $degrees)
# @param $color [Sass::Script::Value::Color]
# @param $degrees [Sass::Script::Value::Number] The number of degrees to
# rotate the hue
# @return [Sass::Script::Value::Color]
# @raise [ArgumentError] if either parameter is the wrong type
def adjust_hue(color, degrees)
assert_type color, :Color, :color
assert_type degrees, :Number, :degrees
color.with(:hue => color.hue + degrees.value)
end
declare :adjust_hue, [:color, :degrees]
# Converts a color into the format understood by IE filters.
#
# @example
# ie-hex-str(#abc) => #FFAABBCC
# ie-hex-str(#3322BB) => #FF3322BB
# ie-hex-str(rgba(0, 255, 0, 0.5)) => #8000FF00
# @overload ie_hex_str($color)
# @param $color [Sass::Script::Value::Color]
# @return [Sass::Script::Value::String] The IE-formatted string
# representation of the color
# @raise [ArgumentError] if `$color` isn't a color
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
declare :ie_hex_str, [:color]
# 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.
#
# @example
# adjust-color(#102030, $blue: 5) => #102035
# adjust-color(#102030, $red: -5, $blue: 5) => #0b2035
# adjust-color(hsl(25, 100%, 80%), $lightness: -30%, $alpha: -0.4) => hsla(25, 100%, 50%, 0.6)
# @overload adjust_color($color, [$red], [$green], [$blue], [$hue], [$saturation], [$lightness], [$alpha])
# @param $color [Sass::Script::Value::Color]
# @param $red [Sass::Script::Value::Number] The adjustment to make on the
# red component, between -255 and 255 inclusive
# @param $green [Sass::Script::Value::Number] The adjustment to make on the
# green component, between -255 and 255 inclusive
# @param $blue [Sass::Script::Value::Number] The adjustment to make on the
# blue component, between -255 and 255 inclusive
# @param $hue [Sass::Script::Value::Number] The adjustment to make on the
# hue component, in degrees
# @param $saturation [Sass::Script::Value::Number] The adjustment to make on
# the saturation component, between `-100%` and `100%` inclusive
# @param $lightness [Sass::Script::Value::Number] The adjustment to make on
# the lightness component, between `-100%` and `100%` inclusive
# @param $alpha [Sass::Script::Value::Number] The adjustment to make on the
# alpha component, between -1 and 1 inclusive
# @return [Sass::Script::Value::Color]
# @raise [ArgumentError] if any parameter is the wrong type or out-of
# bounds, or if RGB properties and HSL properties are adjusted at the
# same time
def adjust_color(color, kwargs)
assert_type color, :Color, :color
with = Sass::Util.map_hash(
"red" => [-255..255, ""],
"green" => [-255..255, ""],
"blue" => [-255..255, ""],
"hue" => nil,
"saturation" => [-100..100, "%"],
"lightness" => [-100..100, "%"],
"alpha" => [-1..1, ""]
) do |name, (range, units)|
val = kwargs.delete(name)
next unless val
assert_type val, :Number, name
Sass::Util.check_range("$#{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 $#{name} (#{val})")
end
color.with(with)
end
declare :adjust_color, [:color], :var_kwargs => true
# Fluidly scales one or more properties of a color. Unlike
# \{#adjust_color adjust-color}, which changes a color's properties by fixed
# amounts, \{#scale_color scale-color} fluidly changes them based on how
# high or low they already are. That means that lightening an already-light
# color with \{#scale_color scale-color} won't change the lightness much,
# but lightening a dark color by the same amount will change it more
# dramatically. This has the benefit of making `scale-color($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.
#
# @example
# 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%, $alpha: -30%) => hsla(200, 7%, 80%, 0.7)
# @overload scale_color($color, [$red], [$green], [$blue], [$saturation], [$lightness], [$alpha])
# @param $color [Sass::Script::Value::Color]
# @param $red [Sass::Script::Value::Number]
# @param $green [Sass::Script::Value::Number]
# @param $blue [Sass::Script::Value::Number]
# @param $saturation [Sass::Script::Value::Number]
# @param $lightness [Sass::Script::Value::Number]
# @param $alpha [Sass::Script::Value::Number]
# @return [Sass::Script::Value::Color]
# @raise [ArgumentError] if any parameter is the wrong type or out-of
# bounds, or if RGB properties and HSL properties are adjusted at the
# same time
def scale_color(color, kwargs)
assert_type color, :Color, :color
with = Sass::Util.map_hash(
"red" => 255,
"green" => 255,
"blue" => 255,
"saturation" => 100,
"lightness" => 100,
"alpha" => 1
) do |name, max|
val = kwargs.delete(name)
next unless val
assert_type val, :Number, name
assert_unit val, '%', name
Sass::Util.check_range("$#{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 $#{name} (#{val})")
end
color.with(with)
end
declare :scale_color, [:color], :var_kwargs => true
# Changes one or more properties of a color. This can change the red, green,
# blue, hue, saturation, value, and alpha properties. The properties are
# specified as keyword arguments, and replace the color's current value for
# that property.
#
# All properties are optional. You can't specify both RGB properties
# (`$red`, `$green`, `$blue`) and HSL properties (`$hue`, `$saturation`,
# `$value`) at the same time.
#
# @example
# change-color(#102030, $blue: 5) => #102005
# change-color(#102030, $red: 120, $blue: 5) => #782005
# change-color(hsl(25, 100%, 80%), $lightness: 40%, $alpha: 0.8) => hsla(25, 100%, 40%, 0.8)
# @overload change_color($color, [$red], [$green], [$blue], [$hue], [$saturation], [$lightness], [$alpha])
# @param $color [Sass::Script::Value::Color]
# @param $red [Sass::Script::Value::Number] The new red component for the
# color, within 0 and 255 inclusive
# @param $green [Sass::Script::Value::Number] The new green component for
# the color, within 0 and 255 inclusive
# @param $blue [Sass::Script::Value::Number] The new blue component for the
# color, within 0 and 255 inclusive
# @param $hue [Sass::Script::Value::Number] The new hue component for the
# color, in degrees
# @param $saturation [Sass::Script::Value::Number] The new saturation
# component for the color, between `0%` and `100%` inclusive
# @param $lightness [Sass::Script::Value::Number] The new lightness
# component for the color, within `0%` and `100%` inclusive
# @param $alpha [Sass::Script::Value::Number] The new alpha component for
# the color, within 0 and 1 inclusive
# @return [Sass::Script::Value::Color]
# @raise [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
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 $#{name} (#{val})")
end
color.with(with)
end
declare :change_color, [:color], :var_kwargs => true
# Mixes two colors together. Specifically, takes the average of each of the
# RGB components, optionally weighted by the given percentage. The opacity
# of the colors is also considered when weighting the components.
#
# The weight specifies the amount of the first color that should be included
# in the returned color. The default, `50%`, means that half the first color
# and half the second color should be used. `25%` means that a quarter of
# the first color and three quarters of the second color should be used.
#
# @example
# mix(#f00, #00f) => #7f007f
# mix(#f00, #00f, 25%) => #3f00bf
# mix(rgba(255, 0, 0, 0.5), #00f) => rgba(63, 0, 191, 0.75)
# @overload mix($color1, $color2, $weight: 50%)
# @param $color1 [Sass::Script::Value::Color]
# @param $color2 [Sass::Script::Value::Color]
# @param $weight [Sass::Script::Value::Number] The relative weight of each
# color. Closer to `100%` gives more weight to `$color1`, closer to `0%`
# gives more weight to `$color2`
# @return [Sass::Script::Value::Color]
# @raise [ArgumentError] if `$weight` is out of bounds or any parameter is
# the wrong type
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
declare :mix, [:color1, :color2]
declare :mix, [:color1, :color2, :weight]
# Converts a color to grayscale. This is identical to `desaturate(color,
# 100%)`.
#
# @see #desaturate
# @overload grayscale($color)
# @param $color [Sass::Script::Value::Color]
# @return [Sass::Script::Value::Color]
# @raise [ArgumentError] if `$color` isn't a color
def grayscale(color)
if color.is_a?(Sass::Script::Value::Number)
return identifier("grayscale(#{color})")
end
desaturate color, number(100)
end
declare :grayscale, [:color]
# Returns the complement of a color. This is identical to `adjust-hue(color,
# 180deg)`.
#
# @see #adjust_hue #adjust-hue
# @overload complement($color)
# @param $color [Sass::Script::Value::Color]
# @return [Sass::Script::Value::Color]
# @raise [ArgumentError] if `$color` isn't a color
def complement(color)
adjust_hue color, number(180)
end
declare :complement, [:color]
# Returns the inverse (negative) of a color. The red, green, and blue values
# are inverted, while the opacity is left alone.
#
# @overload invert($color)
# @param $color [Sass::Script::Value::Color]
# @overload invert($color, $weight: 100%)
# @param $color [Sass::Script::Value::Color]
# @param $weight [Sass::Script::Value::Number] The relative weight of the
# color color's inverse
# @return [Sass::Script::Value::Color]
# @raise [ArgumentError] if `$color` isn't a color or `$weight`
# isn't a percentage between 0% and 100%
def invert(color, weight = number(100))
if color.is_a?(Sass::Script::Value::Number)
return identifier("invert(#{color})")
end
assert_type color, :Color, :color
inv = color.with(
:red => (255 - color.red),
:green => (255 - color.green),
:blue => (255 - color.blue))
mix(inv, color, weight)
end
declare :invert, [:color]
declare :invert, [:color, :weight]
# Removes quotes from a string. If the string is already unquoted, this will
# return it unmodified.
#
# @see #quote
# @example
# unquote("foo") => foo
# unquote(foo) => foo
# @overload unquote($string)
# @param $string [Sass::Script::Value::String]
# @return [Sass::Script::Value::String]
# @raise [ArgumentError] if `$string` isn't a string
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)
$_sass_warned_for_unquote << key if frame
# rubocop:enable GlobalVars
Sass::Util.sass_warn(<<MESSAGE.strip)
DEPRECATION WARNING: Passing #{string.to_sass}, a non-string value, to unquote()
will be an error in future versions of Sass.
#{environment.stack.to_s.gsub(/^/, ' ' * 8)}
MESSAGE
return string
end
return string if string.type == :identifier
identifier(string.value)
end
declare :unquote, [:string]
# Add quotes to a string if the string isn't quoted,
# or returns the same string if it is.
#
# @see #unquote
# @example
# quote("foo") => "foo"
# quote(foo) => "foo"
# @overload quote($string)
# @param $string [Sass::Script::Value::String]
# @return [Sass::Script::Value::String]
# @raise [ArgumentError] if `$string` isn't a string
def quote(string)
assert_type string, :String, :string
if string.type != :string
quoted_string(string.value)
else
string
end
end
declare :quote, [:string]
# Returns the number of characters in a string.
#
# @example
# str-length("foo") => 3
# @overload str_length($string)
# @param $string [Sass::Script::Value::String]
# @return [Sass::Script::Value::Number]
# @raise [ArgumentError] if `$string` isn't a string
def str_length(string)
assert_type string, :String, :string
number(string.value.size)
end
declare :str_length, [:string]
# Inserts `$insert` into `$string` at `$index`.
#
# Note that unlike some languages, the first character in a Sass string is
# number 1, the second number 2, and so forth.
#
# @example
# str-insert("abcd", "X", 1) => "Xabcd"
# str-insert("abcd", "X", 4) => "abcXd"
# str-insert("abcd", "X", 5) => "abcdX"
#
# @overload str_insert($string, $insert, $index)
# @param $string [Sass::Script::Value::String]
# @param $insert [Sass::Script::Value::String]
# @param $index [Sass::Script::Value::Number] The position at which
# `$insert` will be inserted. Negative indices count from the end of
# `$string`. An index that's outside the bounds of the string will insert
# `$insert` at the front or back of the string
# @return [Sass::Script::Value::String] The result string. This will be
# quoted if and only if `$string` was quoted
# @raise [ArgumentError] if any parameter is the wrong type
def str_insert(original, insert, index)
assert_type original, :String, :string
assert_type insert, :String, :insert
assert_integer index, :index
assert_unit index, nil, :index
insertion_point = if index.to_i > 0
[index.to_i - 1, original.value.size].min
else
[index.to_i, -original.value.size - 1].max
end
result = original.value.dup.insert(insertion_point, insert.value)
Sass::Script::Value::String.new(result, original.type)
end
declare :str_insert, [:string, :insert, :index]
# Returns the index of the first occurrence of `$substring` in `$string`. If
# there is no such occurrence, returns `null`.
#
# Note that unlike some languages, the first character in a Sass string is
# number 1, the second number 2, and so forth.
#
# @example
# str-index(abcd, a) => 1
# str-index(abcd, ab) => 1
# str-index(abcd, X) => null
# str-index(abcd, c) => 3
#
# @overload str_index($string, $substring)
# @param $string [Sass::Script::Value::String]
# @param $substring [Sass::Script::Value::String]
# @return [Sass::Script::Value::Number, Sass::Script::Value::Null]
# @raise [ArgumentError] if any parameter is the wrong type
def str_index(string, substring)
assert_type string, :String, :string
assert_type substring, :String, :substring
index = string.value.index(substring.value)
index ? number(index + 1) : null
end
declare :str_index, [:string, :substring]
# Extracts a substring from `$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.
#
# @example
# str-slice("abcd", 2, 3) => "bc"
# str-slice("abcd", 2) => "bcd"
# str-slice("abcd", -3, -2) => "bc"
# str-slice("abcd", 2, -2) => "bc"
#
# @overload str_slice($string, $start-at, $end-at: -1)
# @param $start-at [Sass::Script::Value::Number] The index of the first
# character of the substring. If this is negative, it counts from the end
# of `$string`
# @param $end-at [Sass::Script::Value::Number] The index of the last
# character of the substring. If this is negative, it counts from the end
# of `$string`. Defaults to -1
# @return [Sass::Script::Value::String] The substring. This will be quoted
# if and only if `$string` was quoted
# @raise [ArgumentError] if any parameter is the wrong type
def str_slice(string, start_at, end_at = nil)
assert_type string, :String, :string
assert_unit start_at, nil, "start-at"
end_at = number(-1) if end_at.nil?
assert_unit end_at, nil, "end-at"
return Sass::Script::Value::String.new("", string.type) if end_at.value == 0
s = start_at.value > 0 ? start_at.value - 1 : start_at.value
e = end_at.value > 0 ? end_at.value - 1 : end_at.value
s = string.value.length + s if s < 0
s = 0 if s < 0
e = string.value.length + e if e < 0
return Sass::Script::Value::String.new("", string.type) if e < 0
extracted = string.value.slice(s..e)
Sass::Script::Value::String.new(extracted || "", string.type)
end
declare :str_slice, [:string, :start_at]
declare :str_slice, [:string, :start_at, :end_at]
# Converts a string to upper case.
#
# @example
# to-upper-case(abcd) => ABCD
#
# @overload to_upper_case($string)
# @param $string [Sass::Script::Value::String]
# @return [Sass::Script::Value::String]
# @raise [ArgumentError] if `$string` isn't a string
def to_upper_case(string)
assert_type string, :String, :string
Sass::Script::Value::String.new(string.value.upcase, string.type)
end
declare :to_upper_case, [:string]
# Convert a string to lower case,
#
# @example
# to-lower-case(ABCD) => abcd
#
# @overload to_lower_case($string)
# @param $string [Sass::Script::Value::String]
# @return [Sass::Script::Value::String]
# @raise [ArgumentError] if `$string` isn't a string
def to_lower_case(string)
assert_type string, :String, :string
Sass::Script::Value::String.new(string.value.downcase, string.type)
end
declare :to_lower_case, [:string]
# Returns the type of a value.
#
# @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
# type-of(null) => null
# type-of(a b c) => list
# type-of((a: 1, b: 2)) => map
# type-of(get-function("foo")) => function
#
# @overload type_of($value)
# @param $value [Sass::Script::Value::Base] The value to inspect
# @return [Sass::Script::Value::String] The unquoted string name of the
# value's type
def type_of(value)
identifier(value.class.name.gsub(/Sass::Script::Value::/, '').downcase)
end
declare :type_of, [:value]
# Returns whether a feature exists in the current Sass runtime.
#
# The following features are supported:
#
# * `global-variable-shadowing` indicates that a local variable will shadow
# a global variable unless `!global` is used.
#
# * `extend-selector-pseudoclass` indicates that `@extend` will reach into
# selector pseudoclasses like `:not`.
#
# * `units-level-3` indicates full support for unit arithmetic using units
# defined in the [Values and Units Level 3][] spec.
#
# [Values and Units Level 3]: http://www.w3.org/TR/css3-values/
#
# * `at-error` indicates that the Sass `@error` directive is supported.
#
# * `custom-property` indicates that the [Custom Properties Level 1][] spec
# is supported. This means that custom properties are parsed statically,
# with only interpolation treated as SassScript.
#
# [Custom Properties Level 1]: https://www.w3.org/TR/css-variables-1/
#
# @example
# feature-exists(some-feature-that-exists) => true
# feature-exists(what-is-this-i-dont-know) => false
#
# @overload feature_exists($feature)
# @param $feature [Sass::Script::Value::String] The name of the feature
# @return [Sass::Script::Value::Bool] Whether the feature is supported in this version of Sass
# @raise [ArgumentError] if `$feature` isn't a string
def feature_exists(feature)
assert_type feature, :String, :feature
bool(Sass.has_feature?(feature.value))
end
declare :feature_exists, [:feature]
# Returns a reference to a function for later invocation with the `call()` function.
#
# If `$css` is `false`, the function reference may refer to a function
# defined in your stylesheet or built-in to the host environment. If it's
# `true` it will refer to a plain-CSS function.
#
# @example
# get-function("rgb")
#
# @function myfunc { @return "something"; }
# get-function("myfunc")
#
# @overload get_function($name, $css: false)
# @param name [Sass::Script::Value::String] The name of the function being referenced.
# @param css [Sass::Script::Value::Bool] Whether to get a plain CSS function.
#
# @return [Sass::Script::Value::Function] A function reference.
def get_function(name, kwargs = {})
assert_type name, :String, :name
css = if kwargs.has_key?("css")
v = kwargs.delete("css")
assert_type v, :Bool, :css
v.value
else
false
end
if kwargs.any?
raise ArgumentError.new("Illegal keyword argument '#{kwargs.keys.first}'")
end
if css
return Sass::Script::Value::Function.new(
Sass::Callable.new(name.value, nil, nil, nil, nil, nil, "function", :css))
end
callable = environment.caller.function(name.value) ||
(Sass::Script::Functions.callable?(name.value.tr("-", "_")) &&
Sass::Callable.new(name.value, nil, nil, nil, nil, nil, "function", :builtin))
if callable
Sass::Script::Value::Function.new(callable)
else
raise Sass::SyntaxError.new("Function not found: #{name}")
end
end
declare :get_function, [:name], :var_kwargs => true
# Returns the unit(s) associated with a number. Complex units are sorted in
# alphabetical order by numerator and denominator.
#
# @example
# unit(100) => ""
# unit(100px) => "px"
# unit(3em) => "em"
# unit(10px * 5em) => "em*px"
# unit(10px * 5em / 30cm / 1rem) => "em*px/cm*rem"
# @overload unit($number)
# @param $number [Sass::Script::Value::Number]
# @return [Sass::Script::Value::String] The unit(s) of the number, as a
# quoted string
# @raise [ArgumentError] if `$number` isn't a number
def unit(number)
assert_type number, :Number, :number
quoted_string(number.unit_str)
end
declare :unit, [:number]
# Returns whether a number has units.
#
# @example
# unitless(100) => true
# unitless(100px) => false
# @overload unitless($number)
# @param $number [Sass::Script::Value::Number]
# @return [Sass::Script::Value::Bool]
# @raise [ArgumentError] if `$number` isn't a number
def unitless(number)
assert_type number, :Number, :number
bool(number.unitless?)
end
declare :unitless, [:number]
# Returns whether two numbers can added, subtracted, or compared.
#
# @example
# comparable(2px, 1px) => true
# comparable(100px, 3em) => false
# comparable(10cm, 3mm) => true
# @overload comparable($number1, $number2)
# @param $number1 [Sass::Script::Value::Number]
# @param $number2 [Sass::Script::Value::Number]
# @return [Sass::Script::Value::Bool]
# @raise [ArgumentError] if either parameter is the wrong type
def comparable(number1, number2)
assert_type number1, :Number, :number1
assert_type number2, :Number, :number2
bool(number1.comparable_to?(number2))
end
declare :comparable, [:number1, :number2]
# Converts a unitless number to a percentage.
#
# @example
# percentage(0.2) => 20%
# percentage(100px / 50px) => 200%
# @overload percentage($number)
# @param $number [Sass::Script::Value::Number]
# @return [Sass::Script::Value::Number]
# @raise [ArgumentError] if `$number` isn't a unitless number
def percentage(number)
unless number.is_a?(Sass::Script::Value::Number) && number.unitless?
raise ArgumentError.new("$number: #{number.inspect} is not a unitless number")
end
number(number.value * 100, '%')
end
declare :percentage, [:number]
# Rounds a number to the nearest whole number.
#
# @example
# round(10.4px) => 10px
# round(10.6px) => 11px
# @overload round($number)
# @param $number [Sass::Script::Value::Number]
# @return [Sass::Script::Value::Number]
# @raise [ArgumentError] if `$number` isn't a number
def round(number)
numeric_transformation(number) {|n| Sass::Util.round(n)}
end
declare :round, [:number]
# Rounds a number up to the next whole number.
#
# @example
# ceil(10.4px) => 11px
# ceil(10.6px) => 11px
# @overload ceil($number)
# @param $number [Sass::Script::Value::Number]
# @return [Sass::Script::Value::Number]
# @raise [ArgumentError] if `$number` isn't a number
def ceil(number)
numeric_transformation(number) {|n| n.ceil}
end
declare :ceil, [:number]
# Rounds a number down to the previous whole number.
#
# @example
# floor(10.4px) => 10px
# floor(10.6px) => 10px
# @overload floor($number)
# @param $number [Sass::Script::Value::Number]
# @return [Sass::Script::Value::Number]
# @raise [ArgumentError] if `$number` isn't a number
def floor(number)
numeric_transformation(number) {|n| n.floor}
end
declare :floor, [:number]
# Returns the absolute value of a number.
#
# @example
# abs(10px) => 10px
# abs(-10px) => 10px
# @overload abs($number)
# @param $number [Sass::Script::Value::Number]
# @return [Sass::Script::Value::Number]
# @raise [ArgumentError] if `$number` isn't a number
def abs(number)
numeric_transformation(number) {|n| n.abs}
end
declare :abs, [:number]
# Finds the minimum of several numbers. This function takes any number of
# arguments.
#
# @example
# min(1px, 4px) => 1px
# min(5em, 3em, 4em) => 3em
# @overload min($numbers...)
# @param $numbers [[Sass::Script::Value::Number]]
# @return [Sass::Script::Value::Number]
# @raise [ArgumentError] if any argument isn't a number, or if not all of
# the arguments have comparable units
def min(*numbers)
numbers.each {|n| assert_type n, :Number}
numbers.inject {|min, num| min.lt(num).to_bool ? min : num}
end
declare :min, [], :var_args => :true
# Finds the maximum of several numbers. This function takes any number of
# arguments.
#
# @example
# max(1px, 4px) => 4px
# max(5em, 3em, 4em) => 5em
# @overload max($numbers...)
# @param $numbers [[Sass::Script::Value::Number]]
# @return [Sass::Script::Value::Number]
# @raise [ArgumentError] if any argument isn't a number, or if not all of
# the arguments have comparable units
def max(*values)
values.each {|v| assert_type v, :Number}
values.inject {|max, val| max.gt(val).to_bool ? max : val}
end
declare :max, [], :var_args => :true
# Return the length of a list.
#
# This can return the number of pairs in a map as well.
#
# @example
# length(10px) => 1
# length(10px 20px 30px) => 3
# length((width: 10px, height: 20px)) => 2
# @overload length($list)
# @param $list [Sass::Script::Value::Base]
# @return [Sass::Script::Value::Number]
def length(list)
number(list.to_a.size)
end
declare :length, [:list]
# Return a new list, based on the list provided, but with the nth
# element changed to the value given.
#
# Note that unlike some languages, the first item in a Sass list is number
# 1, the second number 2, and so forth.
#
# Negative index values address elements in reverse order, starting with the last element
# in the list.
#
# @example
# set-nth($list: 10px 20px 30px, $n: 2, $value: -20px) => 10px -20px 30px
# @overload set-nth($list, $n, $value)
# @param $list [Sass::Script::Value::Base] The list that will be copied, having the element
# at index `$n` changed.
# @param $n [Sass::Script::Value::Number] The index of the item to set.
# Negative indices count from the end of the list.
# @param $value [Sass::Script::Value::Base] The new value at index `$n`.
# @return [Sass::Script::Value::List]
# @raise [ArgumentError] if `$n` isn't an integer between 1 and the length
# of `$list`
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
list.with_contents(new_list)
end
declare :set_nth, [:list, :n, :value]
# 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.
#
# @example
# nth(10px 20px 30px, 1) => 10px
# nth((Helvetica, Arial, sans-serif), 3) => sans-serif
# nth((width: 10px, length: 20px), 2) => length, 20px
# @overload nth($list, $n)
# @param $list [Sass::Script::Value::Base]
# @param $n [Sass::Script::Value::Number] The index of the item to get.
# Negative indices count from the end of the list.
# @return [Sass::Script::Value::Base]
# @raise [ArgumentError] if `$n` isn't an integer between 1 and the length
# of `$list`
def nth(list, n)
assert_type n, :Number, :n
Sass::Script::Value::List.assert_valid_index(list, n)
index = n.to_i > 0 ? n.to_i - 1 : n.to_i
list.to_a[index]
end
declare :nth, [:list, :n]
# Joins together two lists into one.
#
# Unless `$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.
#
# Unless `$bracketed` is passed, the resulting list is bracketed if the
# first parameter is.
#
# Like all list functions, `join()` returns a new list rather than modifying
# its arguments in place.
#
# @example
# join(10px 20px, 30px 40px) => 10px 20px 30px 40px
# join((blue, red), (#abc, #def)) => blue, red, #abc, #def
# join(10px, 20px) => 10px 20px
# join(10px, 20px, comma) => 10px, 20px
# join((blue, red), (#abc, #def), space) => blue red #abc #def
# join([10px], 20px) => [10px 20px]
# @overload join($list1, $list2, $separator: auto, $bracketed: auto)
# @param $list1 [Sass::Script::Value::Base]
# @param $list2 [Sass::Script::Value::Base]
# @param $separator [Sass::Script::Value::String] The list separator to use.
# If this is `comma` or `space`, that separator will be used. If this is
# `auto` (the default), the separator is determined as explained above.
# @param $bracketed [Sass::Script::Value::Base] Whether the resulting list
# will be bracketed. If this is `auto` (the default), the separator is
# determined as explained above.
# @return [Sass::Script::Value::List]
# @comment
# rubocop:disable ParameterLists
def join(list1, list2,
separator = identifier("auto"), bracketed = identifier("auto"),
kwargs = nil, *rest)
# rubocop:enable ParameterLists
if separator.is_a?(Hash)
kwargs = separator
separator = identifier("auto")
elsif bracketed.is_a?(Hash)
kwargs = bracketed
bracketed = identifier("auto")
elsif rest.last.is_a?(Hash)
rest.unshift kwargs
kwargs = rest.pop
end
unless rest.empty?
# Add 4 to rest.length because we don't want to count the kwargs hash,
# which is always passed.
raise ArgumentError.new("wrong number of arguments (#{rest.length + 4} for 2..4)")
end
if kwargs
separator = kwargs.delete("separator") || separator
bracketed = kwargs.delete("bracketed") || bracketed
unless kwargs.empty?
name, val = kwargs.to_a.first
raise ArgumentError.new("Unknown argument $#{name} (#{val})")
end
end
assert_type separator, :String, :separator
unless %w(auto space comma).include?(separator.value)
raise ArgumentError.new("Separator name must be space, comma, or auto")
end
list(list1.to_a + list2.to_a,
separator:
if separator.value == 'auto'
list1.separator || list2.separator || :space
else
separator.value.to_sym
end,
bracketed:
if bracketed.is_a?(Sass::Script::Value::String) && bracketed.value == 'auto'
list1.bracketed
else
bracketed.to_bool
end)
end
# We don't actually take variable arguments or keyword arguments, but this
# is the best way to take either `$separator` or `$bracketed` as keywords
# without complaining about the other missing.
declare :join, [:list1, :list2], :var_args => true, :var_kwargs => true
# Appends a single value onto the end of a list.
#
# Unless the `$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.
#
# @example
# 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
# @overload append($list, $val, $separator: auto)
# @param $list [Sass::Script::Value::Base]
# @param $val [Sass::Script::Value::Base]
# @param $separator [Sass::Script::Value::String] The list separator to use.
# If this is `comma` or `space`, that separator will be used. If this is
# `auto` (the default), the separator is determined as explained above.
# @return [Sass::Script::Value::List]
def append(list, val, separator = identifier("auto"))
assert_type separator, :String, :separator
unless %w(auto space comma).include?(separator.value)
raise ArgumentError.new("Separator name must be space, comma, or auto")
end
list.with_contents(list.to_a + [val],
separator:
if separator.value == 'auto'
list.separator || :space
else
separator.value.to_sym
end)
end
declare :append, [:list, :val]
declare :append, [:list, :val, :separator]
# Combines several lists into a single multidimensional list. The nth value
# of the resulting list is a space separated list of the source lists' nth
# values.
#
# The length of the resulting list is the length of the
# shortest list.
#
# @example
# zip(1px 1px 3px, solid dashed solid, red green blue)
# => 1px solid red, 1px dashed green, 3px solid blue
# @overload zip($lists...)
# @param $lists [[Sass::Script::Value::Base]]
# @return [Sass::Script::Value::List]
def zip(*lists)
length = nil
values = []
lists.each do |list|
array = list.to_a
values << array.dup
length = length.nil? ? array.length : [length, array.length].min
end
values.each do |value|
value.slice!(length)
end
new_list_value = values.first.zip(*values[1..-1])
list(new_list_value.map {|list| list(list, :space)}, :comma)
end
declare :zip, [], :var_args => true
# Returns the position of a value within a list. If the value isn't found,
# returns `null` instead.
#
# Note that unlike some languages, the first item in a Sass list is number
# 1, the second number 2, and so forth.
#
# This can return the position of a pair in a map as well.
#
# @example
# index(1px solid red, solid) => 2
# index(1px solid red, dashed) => null
# index((width: 10px, height: 20px), (height 20px)) => 2
# @overload index($list, $value)
# @param $list [Sass::Script::Value::Base]
# @param $value [Sass::Script::Value::Base]
# @return [Sass::Script::Value::Number, Sass::Script::Value::Null] The
# 1-based index of `$value` in `$list`, or `null`
def index(list, value)
index = list.to_a.index {|e| e.eq(value).to_bool}
index ? number(index + 1) : null
end
declare :index, [:list, :value]
# Returns the separator of a list. If the list doesn't have a separator due
# to having fewer than two elements, returns `space`.
#
# @example
# list-separator(1px 2px 3px) => space
# list-separator(1px, 2px, 3px) => comma
# list-separator('foo') => space
# @overload list_separator($list)
# @param $list [Sass::Script::Value::Base]
# @return [Sass::Script::Value::String] `comma` or `space`
def list_separator(list)
identifier((list.separator || :space).to_s)
end
declare :list_separator, [:list]
# Returns whether a list uses square brackets.
#
# @example
# is-bracketed(1px 2px 3px) => false
# is-bracketed([1px, 2px, 3px]) => true
# @overload is_bracketed($list)
# @param $list [Sass::Script::Value::Base]
# @return [Sass::Script::Value::Bool]
def is_bracketed(list)
bool(list.bracketed)
end
declare :is_bracketed, [:list]
# Returns the value in a map associated with the given key. If the map
# doesn't have such a key, returns `null`.
#
# @example
# map-get(("foo": 1, "bar": 2), "foo") => 1
# map-get(("foo": 1, "bar": 2), "bar") => 2
# map-get(("foo": 1, "bar": 2), "baz") => null
# @overload map_get($map, $key)
# @param $map [Sass::Script::Value::Map]
# @param $key [Sass::Script::Value::Base]
# @return [Sass::Script::Value::Base] The value indexed by `$key`, or `null`
# if the map doesn't contain the given key
# @raise [ArgumentError] if `$map` is not a map
def map_get(map, key)
assert_type map, :Map, :map
map.to_h[key] || null
end
declare :map_get, [:map, :key]
# Merges two maps together into a new map. Keys in `$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.
#
# @example
# map-merge(("foo": 1), ("bar": 2)) => ("foo": 1, "bar": 2)
# map-merge(("foo": 1, "bar": 2), ("bar": 3)) => ("foo": 1, "bar": 3)
# @overload map_merge($map1, $map2)
# @param $map1 [Sass::Script::Value::Map]
# @param $map2 [Sass::Script::Value::Map]
# @return [Sass::Script::Value::Map]
# @raise [ArgumentError] if either parameter is not a map
def map_merge(map1, map2)
assert_type map1, :Map, :map1
assert_type map2, :Map, :map2
map(map1.to_h.merge(map2.to_h))
end
declare :map_merge, [:map1, :map2]
# Returns a new map with keys removed.
#
# Like all map functions, `map-merge()` returns a new map rather than
# modifying its arguments in place.
#
# @example
# map-remove(("foo": 1, "bar": 2), "bar") => ("foo": 1)
# map-remove(("foo": 1, "bar": 2, "baz": 3), "bar", "baz") => ("foo": 1)
# map-remove(("foo": 1, "bar": 2), "baz") => ("foo": 1, "bar": 2)
# @overload map_remove($map, $keys...)
# @param $map [Sass::Script::Value::Map]
# @param $keys [[Sass::Script::Value::Base]]
# @return [Sass::Script::Value::Map]
# @raise [ArgumentError] if `$map` is not a map
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
declare :map_remove, [:map, :key], :var_args => true
# Returns a list of all keys in a map.
#
# @example
# map-keys(("foo": 1, "bar": 2)) => "foo", "bar"
# @overload map_keys($map)
# @param $map [Map]
# @return [List] the list of keys, comma-separated
# @raise [ArgumentError] if `$map` is not a map
def map_keys(map)
assert_type map, :Map, :map
list(map.to_h.keys, :comma)
end
declare :map_keys, [:map]
# Returns a list of all values in a map. This list may include duplicate
# values, if multiple keys have the same value.
#
# @example
# map-values(("foo": 1, "bar": 2)) => 1, 2
# map-values(("foo": 1, "bar": 2, "baz": 1)) => 1, 2, 1
# @overload map_values($map)
# @param $map [Map]
# @return [List] the list of values, comma-separated
# @raise [ArgumentError] if `$map` is not a map
def map_values(map)
assert_type map, :Map, :map
list(map.to_h.values, :comma)
end
declare :map_values, [:map]
# Returns whether a map has a value associated with a given key.
#
# @example
# map-has-key(("foo": 1, "bar": 2), "foo") => true
# map-has-key(("foo": 1, "bar": 2), "baz") => false
# @overload map_has_key($map, $key)
# @param $map [Sass::Script::Value::Map]
# @param $key [Sass::Script::Value::Base]
# @return [Sass::Script::Value::Bool]
# @raise [ArgumentError] if `$map` is not a map
def map_has_key(map, key)
assert_type map, :Map, :map
bool(map.to_h.has_key?(key))
end
declare :map_has_key, [:map, :key]
# 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 `$`.
#
# @example
# @mixin foo($args...) {
# @debug keywords($args); //=> (arg1: val, arg2: val)
# }
#
# @include foo($arg1: val, $arg2: val);
# @overload keywords($args)
# @param $args [Sass::Script::Value::ArgList]
# @return [Sass::Script::Value::Map]
# @raise [ArgumentError] if `$args` isn't a variable argument list
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
declare :keywords, [:args]
# Returns one of two values, depending on whether or not `$condition` is
# true. Just like in `@if`, all values other than `false` and `null` are
# considered to be true.
#
# @example
# if(true, 1px, 2px) => 1px
# if(false, 1px, 2px) => 2px
# @overload if($condition, $if-true, $if-false)
# @param $condition [Sass::Script::Value::Base] Whether the `$if-true` or
# `$if-false` will be returned
# @param $if-true [Sass::Script::Tree::Node]
# @param $if-false [Sass::Script::Tree::Node]
# @return [Sass::Script::Value::Base] `$if-true` or `$if-false`
def if(condition, if_true, if_false)
if condition.to_bool
perform(if_true)
else
perform(if_false)
end
end
declare :if, [:condition, :"&if_true", :"&if_false"]
# 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.
#
# @overload unique_id()
# @return [Sass::Script::Value::String]
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
declare :unique_id, []
# 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.
#
# @example
# call(rgb, 10, 100, 255) => #0a64ff
# call(scale-color, #0a64ff, $lightness: -10%) => #0058ef
#
# $fn: nth;
# call($fn, (a b c), 2) => b
#
# @overload call($function, $args...)
# @param $function [Sass::Script::Value::Function] The function to call.
def call(name, *args)
unless name.is_a?(Sass::Script::Value::String) ||
name.is_a?(Sass::Script::Value::Function)
assert_type name, :Function, :function
end
if name.is_a?(Sass::Script::Value::String)
name = if function_exists(name).to_bool
get_function(name)
else
get_function(name, "css" => bool(true))
end
Sass::Util.sass_warn(<<WARNING)
DEPRECATION WARNING: Passing a string to call() is deprecated and will be illegal
in Sass 4.0. Use call(#{name.to_sass}) instead.
WARNING
end
kwargs = args.last.is_a?(Hash) ? args.pop : {}
funcall = Sass::Script::Tree::Funcall.new(
[name.value],
args.map {|a| Sass::Script::Tree::Literal.new(a)},
Sass::Util.map_vals(kwargs) {|v| Sass::Script::Tree::Literal.new(v)},
nil,
nil)
funcall.line = environment.stack.frames.last.line
funcall.filename = environment.stack.frames.last.filename
funcall.options = options
perform(funcall)
end
declare :call, [:name], :var_args => true, :var_kwargs => true
# This function only exists as a workaround for IE7's [`content:
# counter` bug](http://jes.st/2013/ie7s-css-breaking-content-counter-bug/).
# It works identically to any other plain-CSS function, except it
# avoids adding spaces between the argument commas.
#
# @example
# counter(item, ".") => counter(item,".")
# @overload counter($args...)
# @return [Sass::Script::Value::String]
def counter(*args)
identifier("counter(#{args.map {|a| a.to_s(options)}.join(',')})")
end
declare :counter, [], :var_args => true
# This function only exists as a workaround for IE7's [`content:
# counter` bug](http://jes.st/2013/ie7s-css-breaking-content-counter-bug/).
# It works identically to any other plain-CSS function, except it
# avoids adding spaces between the argument commas.
#
# @example
# counters(item, ".") => counters(item,".")
# @overload counters($args...)
# @return [Sass::Script::Value::String]
def counters(*args)
identifier("counters(#{args.map {|a| a.to_s(options)}.join(',')})")
end
declare :counters, [], :var_args => true
# Check whether a variable with the given name exists in the current
# scope or in the global scope.
#
# @example
# $a-false-value: false;
# variable-exists(a-false-value) => true
# variable-exists(a-null-value) => true
#
# variable-exists(nonexistent) => false
#
# @overload variable_exists($name)
# @param $name [Sass::Script::Value::String] The name of the variable to
# check. The name should not include the `$`.
# @return [Sass::Script::Value::Bool] Whether the variable is defined in
# the current scope.
def variable_exists(name)
assert_type name, :String, :name
bool(environment.caller.var(name.value))
end
declare :variable_exists, [:name]
# Check whether a variable with the given name exists in the global
# scope (at the top level of the file).
#
# @example
# $a-false-value: false;
# global-variable-exists(a-false-value) => true
# global-variable-exists(a-null-value) => true
#
# .foo {
# $some-var: false;
# @if global-variable-exists(some-var) { /* false, doesn't run */ }
# }
#
# @overload global_variable_exists($name)
# @param $name [Sass::Script::Value::String] The name of the variable to
# check. The name should not include the `$`.
# @return [Sass::Script::Value::Bool] Whether the variable is defined in
# the global scope.
def global_variable_exists(name)
assert_type name, :String, :name
bool(environment.global_env.var(name.value))
end
declare :global_variable_exists, [:name]
# Check whether a function with the given name exists.
#
# @example
# function-exists(lighten) => true
#
# @function myfunc { @return "something"; }
# function-exists(myfunc) => true
#
# @overload function_exists($name)
# @param name [Sass::Script::Value::String] The name of the function to
# check or a function reference.
# @return [Sass::Script::Value::Bool] Whether the function is defined.
def function_exists(name)
assert_type name, :String, :name
exists = Sass::Script::Functions.callable?(name.value.tr("-", "_"))
exists ||= environment.caller.function(name.value)
bool(exists)
end
declare :function_exists, [:name]
# Check whether a mixin with the given name exists.
#
# @example
# mixin-exists(nonexistent) => false
#
# @mixin red-text { color: red; }
# mixin-exists(red-text) => true
#
# @overload mixin_exists($name)
# @param name [Sass::Script::Value::String] The name of the mixin to
# check.
# @return [Sass::Script::Value::Bool] Whether the mixin is defined.
def mixin_exists(name)
assert_type name, :String, :name
bool(environment.mixin(name.value))
end
declare :mixin_exists, [:name]
# Check whether a mixin was passed a content block.
#
# Unless `content-exists()` is called directly from a mixin, an error will be raised.
#
# @example
# @mixin needs-content {
# @if not content-exists() {
# @error "You must pass a content block!"
# }
# @content;
# }
#
# @overload content_exists()
# @return [Sass::Script::Value::Bool] Whether a content block was passed to the mixin.
def content_exists
# frames.last is the stack frame for this function,
# so we use frames[-2] to get the frame before that.
mixin_frame = environment.stack.frames[-2]
unless mixin_frame && mixin_frame.type == :mixin
raise Sass::SyntaxError.new("Cannot call content-exists() except within a mixin.")
end
bool(!environment.caller.content.nil?)
end
declare :content_exists, []
# Return a string containing the value as its Sass representation.
#
# @overload inspect($value)
# @param $value [Sass::Script::Value::Base] The value to inspect.
# @return [Sass::Script::Value::String] A representation of the value as
# it would be written in Sass.
def inspect(value)
unquoted_string(value.to_sass)
end
declare :inspect, [:value]
# @overload random()
# Return a decimal between 0 and 1, inclusive of 0 but not 1.
# @return [Sass::Script::Value::Number] A decimal value.
# @overload random($limit)
# Return an integer between 1 and `$limit`, inclusive of both 1 and `$limit`.
# @param $limit [Sass::Script::Value::Number] The maximum of the random integer to be
# returned, a positive integer.
# @return [Sass::Script::Value::Number] An integer.
# @raise [ArgumentError] if the `$limit` is not 1 or greater
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("$limit #{limit} must be greater than or equal to 1")
end
number(1 + generator.rand(limit.to_i))
else
number(generator.rand)
end
end
declare :random, []
declare :random, [:limit]
# Parses a user-provided selector into a list of lists of strings
# as returned by `&`.
#
# @example
# selector-parse(".foo .bar, .baz .bang") => ('.foo' '.bar', '.baz' '.bang')
#
# @overload selector_parse($selector)
# @param $selector [Sass::Script::Value::String, Sass::Script::Value::List]
# The selector to parse. This can be either a string, a list of
# strings, or a list of lists of strings as returned by `&`.
# @return [Sass::Script::Value::List]
# A list of lists of strings representing `$selector`. This is
# in the same format as a selector returned by `&`.
def selector_parse(selector)
parse_selector(selector, :selector).to_sass_script
end
declare :selector_parse, [:selector]
# Return a new selector with all selectors in `$selectors` nested beneath
# one another as though they had been nested in the stylesheet as
# `$selector1 { $selector2 { ... } }`.
#
# Unlike most selector functions, `selector-nest` allows the
# parent selector `&` to be used in any selector but the first.
#
# @example
# selector-nest(".foo", ".bar", ".baz") => .foo .bar .baz
# selector-nest(".a .foo", ".b .bar") => .a .foo .b .bar
# selector-nest(".foo", "&.bar") => .foo.bar
#
# @overload selector_nest($selectors...)
# @param $selectors [[Sass::Script::Value::String, Sass::Script::Value::List]]
# The selectors to nest. At least one selector must be passed. Each of
# these can be either a string, a list of strings, or a list of lists of
# strings as returned by `&`.
# @return [Sass::Script::Value::List]
# A list of lists of strings representing the result of nesting
# `$selectors`. This is in the same format as a selector returned by
# `&`.
def selector_nest(*selectors)
if selectors.empty?
raise ArgumentError.new("$selectors: At least one selector must be passed")
end
parsed = [parse_selector(selectors.first, :selectors)]
parsed += selectors[1..-1].map {|sel| parse_selector(sel, :selectors, true)}
parsed.inject {|result, child| child.resolve_parent_refs(result)}.to_sass_script
end
declare :selector_nest, [], :var_args => true
# Return a new selector with all selectors in `$selectors` appended one
# another as though they had been nested in the stylesheet as `$selector1 {
# &$selector2 { ... } }`.
#
# @example
# selector-append(".foo", ".bar", ".baz") => .foo.bar.baz
# selector-append(".a .foo", ".b .bar") => "a .foo.b .bar"
# selector-append(".foo", "-suffix") => ".foo-suffix"
#
# @overload selector_append($selectors...)
# @param $selectors [[Sass::Script::Value::String, Sass::Script::Value::List]]
# The selectors to append. At least one selector must be passed. Each of
# these can be either a string, a list of strings, or a list of lists of
# strings as returned by `&`.
# @return [Sass::Script::Value::List]
# A list of lists of strings representing the result of appending
# `$selectors`. This is in the same format as a selector returned by
# `&`.
# @raise [ArgumentError] if a selector could not be appended.
def selector_append(*selectors)
if selectors.empty?
raise ArgumentError.new("$selectors: At least one selector must be passed")
end
selectors.map {|sel| parse_selector(sel, :selectors)}.inject do |parent, child|
child.members.each do |seq|
sseq = seq.members.first
unless sseq.is_a?(Sass::Selector::SimpleSequence)
raise ArgumentError.new("Can't append \"#{seq}\" to \"#{parent}\"")
end
base = sseq.base
case base
when Sass::Selector::Universal
raise ArgumentError.new("Can't append \"#{seq}\" to \"#{parent}\"")
when Sass::Selector::Element
unless base.namespace.nil?
raise ArgumentError.new("Can't append \"#{seq}\" to \"#{parent}\"")
end
sseq.members[0] = Sass::Selector::Parent.new(base.name)
else
sseq.members.unshift Sass::Selector::Parent.new
end
end
child.resolve_parent_refs(parent)
end.to_sass_script
end
declare :selector_append, [], :var_args => true
# Returns a new version of `$selector` with `$extendee` extended
# with `$extender`. This works just like the result of
#
# $selector { ... }
# $extender { @extend $extendee }
#
# @example
# selector-extend(".a .b", ".b", ".foo .bar") => .a .b, .a .foo .bar, .foo .a .bar
#
# @overload selector_extend($selector, $extendee, $extender)
# @param $selector [Sass::Script::Value::String, Sass::Script::Value::List]
# The selector within which `$extendee` is extended with
# `$extender`. This can be either a string, a list of strings,
# or a list of lists of strings as returned by `&`.
# @param $extendee [Sass::Script::Value::String, Sass::Script::Value::List]
# The selector being extended. This can be either a string, a
# list of strings, or a list of lists of strings as returned
# by `&`.
# @param $extender [Sass::Script::Value::String, Sass::Script::Value::List]
# The selector being injected into `$selector`. This can be
# either a string, a list of strings, or a list of lists of
# strings as returned by `&`.
# @return [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 `&`.
# @raise [ArgumentError] if the extension fails
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
declare :selector_extend, [:selector, :extendee, :extender]
# Replaces all instances of `$original` with `$replacement` in `$selector`
#
# This works by using `@extend` and throwing away the original
# selector. This means that it can be used to do very advanced
# replacements; see the examples below.
#
# @example
# selector-replace(".foo .bar", ".bar", ".baz") => ".foo .baz"
# selector-replace(".foo.bar.baz", ".foo.baz", ".qux") => ".bar.qux"
#
# @overload selector_replace($selector, $original, $replacement)
# @param $selector [Sass::Script::Value::String, Sass::Script::Value::List]
# The selector within which `$original` is replaced with
# `$replacement`. This can be either a string, a list of
# strings, or a list of lists of strings as returned by `&`.
# @param $original [Sass::Script::Value::String, Sass::Script::Value::List]
# The selector being replaced. This can be either a string, a
# list of strings, or a list of lists of strings as returned
# by `&`.
# @param $replacement [Sass::Script::Value::String, Sass::Script::Value::List]
# The selector that `$original` is being replaced with. This
# can be either a string, a list of strings, or a list of
# lists of strings as returned by `&`.
# @return [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 `&`.
# @raise [ArgumentError] if the replacement fails
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
declare :selector_replace, [:selector, :original, :replacement]
# 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.
#
# @example
# 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
#
# @overload selector_unify($selector1, $selector2)
# @param $selector1 [Sass::Script::Value::String, Sass::Script::Value::List]
# The first selector to be unified. This can be either a
# string, a list of strings, or a list of lists of strings as
# returned by `&`.
# @param $selector2 [Sass::Script::Value::String, Sass::Script::Value::List]
# The second selector to be unified. This can be either a
# string, a list of strings, or a list of lists of strings as
# returned by `&`.
# @return [Sass::Script::Value::List, Sass::Script::Value::Null]
# A list of lists of strings representing the result of the
# unification, or null if no unification exists. This is in
# the same format as a selector returned by `&`.
def selector_unify(selector1, selector2)
selector1 = parse_selector(selector1, :selector1)
selector2 = parse_selector(selector2, :selector2)
return null unless (unified = selector1.unify(selector2))
unified.to_sass_script
end
declare :selector_unify, [:selector1, :selector2]
# Returns the [simple
# selectors](http://dev.w3.org/csswg/selectors4/#simple) that
# comprise the compound selector `$selector`.
#
# Note that `$selector` **must be** a [compound
# selector](http://dev.w3.org/csswg/selectors4/#compound). That
# means it cannot contain commas or spaces. It also means that
# unlike other selector functions, this takes only strings, not
# lists.
#
# @example
# simple-selectors(".foo.bar") => ".foo", ".bar"
# simple-selectors(".foo.bar.baz") => ".foo", ".bar", ".baz"
#
# @overload simple_selectors($selector)
# @param $selector [Sass::Script::Value::String]
# The compound selector whose simple selectors will be extracted.
# @return [Sass::Script::Value::List]
# A list of simple selectors in the compound selector.
def simple_selectors(selector)
selector = parse_compound_selector(selector, :selector)
list(selector.members.map {|simple| unquoted_string(simple.to_s)}, :comma)
end
declare :simple_selectors, [:selector]
# Returns whether `$super` is a superselector of `$sub`. This means that
# `$super` matches all the elements that `$sub` matches, as well as possibly
# additional elements. In general, simpler selectors tend to be
# superselectors of more complex oned.
#
# @example
# is-superselector(".foo", ".foo.bar") => true
# is-superselector(".foo.bar", ".foo") => false
# is-superselector(".bar", ".foo .bar") => true
# is-superselector(".foo .bar", ".bar") => false
#
# @overload is_superselector($super, $sub)
# @param $super [Sass::Script::Value::String, Sass::Script::Value::List]
# The potential superselector. This can be either a string, a list of
# strings, or a list of lists of strings as returned by `&`.
# @param $sub [Sass::Script::Value::String, Sass::Script::Value::List]
# The potential subselector. This can be either a string, a list of
# strings, or a list of lists of strings as returned by `&`.
# @return [Sass::Script::Value::Bool]
# Whether `$selector1` is a superselector of `$selector2`.
def is_superselector(sup, sub)
sup = parse_selector(sup, :super)
sub = parse_selector(sub, :sub)
bool(sup.superselector?(sub))
end
declare :is_superselector, [:super, :sub]
private
# This method implements the pattern of transforming a numeric value into
# another numeric value with the same units.
# It yields a number to a block to perform the operation and return a number
def numeric_transformation(value)
assert_type value, :Number, :value
Sass::Script::Value::Number.new(
yield(value.value), value.numerator_units, value.denominator_units)
end
# @comment
# rubocop:disable ParameterLists
def _adjust(color, amount, attr, range, op, units = "")
# rubocop:enable ParameterLists
assert_type color, :Color, :color
assert_type amount, :Number, :amount
Sass::Util.check_range('Amount', range, amount, units)
color.with(attr => color.send(attr).send(op, amount.value))
end
def check_alpha_unit(alpha, function)
return if alpha.unitless?
if alpha.is_unit?("%")
Sass::Util.sass_warn(<<WARNING)
DEPRECATION WARNING: Passing a percentage as the alpha value to #{function}() will be
interpreted differently in future versions of Sass. For now, use #{alpha.value} instead.
WARNING
else
Sass::Util.sass_warn(<<WARNING)
DEPRECATION WARNING: Passing a number with units as the alpha value to #{function}() is
deprecated and will be an error in future versions of Sass. Use #{alpha.value} instead.
WARNING
end
end
end
end