core/lib/compass/core/sass_extensions/functions/math.rb
module Compass::Core::SassExtensions::Functions::Math
extend Compass::Core::SassExtensions::Functions::SassDeclarationHelper
extend Sass::Script::Value::Helpers
def self.included(base)
if base == Sass::Script::Functions
base.send :alias_method, :sass_random, :random
base.send :alias_method, :random, :deprecated_random
end
end
PI = number(Math::PI)
E = number(Math::E)
def pi()
PI
end
declare :pi, []
def deprecated_random(*args)
if args.length == 2
Compass::Util.compass_warn <<WARNING
WARNING: The $start value for random(#{args.first}, #{args.last}) is not supported by Sass and is now
deprecated in Compass and will be removed in a future release.
Use `#{args.first} + random(#{args.last.minus(args.first)})` instead.
WARNING
range = (args.first.value..args.last.value).to_a
number(range[rand(range.length)])
else
sass_random(*args)
end
end
declare :random, [:start, :limit]
def sin(number)
trig(:sin, number)
end
declare :sin, [:number]
def asin(number)
trig(:asin, number)
end
declare :asin, [:number]
def cos(number)
trig(:cos, number)
end
declare :cos, [:number]
def acos(number)
trig(:acos, number)
end
declare :acos, [:number]
def tan(number)
trig(:tan, number)
end
declare :tan, [:number]
def atan(number)
trig(:atan, number)
end
declare :atan, [:number]
def e
E
end
declare :e, []
def logarithm(number, base = e )
assert_type number, :Number
assert_type base, :Number
raise Sass::SyntaxError, "base to logarithm must be unitless." unless base.unitless?
result = Math.log(number.value, base.value) rescue Math.log(number.value) / Math.log(base.value)
number(result, number.unit_str)
end
declare :logarithm, [:number]
declare :logarithm, [:number, :base]
def sqrt(number)
numeric_transformation(number) { |n| Math.sqrt(n) }
end
declare :sqrt, [:number]
alias square_root sqrt
declare :square_root, [:number]
def pow(number, exponent)
assert_type number, :Number
assert_type exponent, :Number
raise Sass::SyntaxError, "exponent to pow must be unitless." unless exponent.unitless?
number(number.value**exponent.value, number.unit_str)
end
declare :pow, [:number, :exponent]
private
def trig(operation, number)
if number.unit_str == "deg"
number(Math.send(operation, Math::PI * number.value / 180))
else
number(Math.send(operation, number.value), number.unit_str)
end
end
end