Class: Sass::Script::Number

Inherits:
Literal show all
Defined in:
lib/sass/script/number.rb

Overview

A SassScript object representing a number. SassScript numbers can have decimal values, and can also have units. For example, 12, 1px, and 10.45em are all valid values.

Numbers can also have more complex units, such as 1px*em/in. These cannot be inputted directly in Sass code at the moment.

Constant Summary collapse

NO_UNITS =

Used so we don't allocate two new arrays for each new number.

[]

Instance Attribute Summary collapse

Attributes inherited from Node

#line, #options

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Literal

#==, #_perform, #assert_int!, #children, #deep_copy, #neq, #null?, #options, #single_eq, #to_a, #to_bool, #unary_div, #unary_not

Methods inherited from Node

#_perform, #children, #dasherize, #deep_copy, #opts, #perform

Constructor Details

#initialize(value, numerator_units = NO_UNITS, denominator_units = NO_UNITS) ⇒ Number 



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# File 'lib/sass/script/number.rb', line 73

def initialize(value, numerator_units = NO_UNITS, denominator_units = NO_UNITS)
  super(value)
  @numerator_units = numerator_units
  @denominator_units = denominator_units
  normalize!
end

Instance Attribute Details

#denominator_units ⇒ Array<String> (readonly)

A list of units in the denominator of the number. For example, 1px*em/in*cm would return ["in", "cm"]



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# File 'lib/sass/script/number.rb', line 26

def denominator_units
  @denominator_units
end

#numerator_units ⇒ Array<String> (readonly)

A list of units in the numerator of the number. For example, 1px*em/in*cm would return ["px", "em"]



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# File 'lib/sass/script/number.rb', line 21

def numerator_units
  @numerator_units
end

#original ⇒ Boolean?

The original representation of this number. For example, although the result of 1px/2px is 0.5, the value of #original is "1px/2px".

This is only non-nil when the original value should be used as the CSS value, as in font: 1px/2px.



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# File 'lib/sass/script/number.rb', line 36

def original
  @original
end

#value ⇒ Numeric (readonly)

The Ruby value of the number.



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# File 'lib/sass/script/number.rb', line 16

def value
  @value
end

Class Method Details

.const_missing(const)

Handles the deprecation warning for the PRECISION constant This can be removed in 3.2.



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# File 'lib/sass/script/number.rb', line 58

def self.const_missing(const)
  if const == :PRECISION
    Sass::Util.sass_warn("Sass::Script::Number::PRECISION is deprecated and will be removed in a future release. Use Sass::Script::Number.precision_factor instead.")
    const_set(:PRECISION, self.precision_factor)
  else
    super
  end
end

.precision 



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# File 'lib/sass/script/number.rb', line 38

def self.precision
  @precision ||= 5
end

.precision=(digits)

Sets the number of digits of precision For example, if this is 3, 3.1415926 will be printed as 3.142.



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# File 'lib/sass/script/number.rb', line 45

def self.precision=(digits)
  @precision = digits.round
  @precision_factor = 10.0**@precision
end

.precision_factor

the precision factor used in numeric output it is derived from the precision method.



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# File 'lib/sass/script/number.rb', line 52

def self.precision_factor
  @precision_factor ||= 10.0**precision
end

Instance Method Details

#coerce(num_units, den_units) ⇒ Number

Returns this number converted to other units. The conversion takes into account the relationship between e.g. mm and cm, as well as between e.g. in and cm.

If this number has no units, it will simply return itself with the given units.

An incompatible coercion, e.g. between px and cm, will raise an error.

Raises:



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# File 'lib/sass/script/number.rb', line 321

def coerce(num_units, den_units)
  Number.new(if unitless?
               self.value
             else
               self.value * coercion_factor(@numerator_units, num_units) /
                 coercion_factor(@denominator_units, den_units)
             end, num_units, den_units)
end

#comparable_to?(other) ⇒ Boolean 



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# File 'lib/sass/script/number.rb', line 332

def comparable_to?(other)
  begin
    operate(other, :+)
    true
  rescue Sass::UnitConversionError
    false
  end
end

#div(other) ⇒ Literal

The SassScript / operation. Its functionality depends on the type of its argument:

Sass::Script::Number : Divides this number by the other, converting units appropriately.

Literal : See Literal#div.



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# File 'lib/sass/script/number.rb', line 172

def div(other)
  if other.is_a? Number
    res = operate(other, :/)
    if self.original && other.original
      res.original = "#{self.original}/#{other.original}"
    end
    res
  else
    super
  end
end

#eq(other) ⇒ Boolean

The SassScript == operation.



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# File 'lib/sass/script/number.rb', line 205

def eq(other)
  return Sass::Script::Bool.new(false) unless other.is_a?(Sass::Script::Number)
  this = self
  begin
    if unitless?
      this = this.coerce(other.numerator_units, other.denominator_units)
    else
      other = other.coerce(@numerator_units, @denominator_units)
    end
  rescue Sass::UnitConversionError
    return Sass::Script::Bool.new(false)
  end

  Sass::Script::Bool.new(this.value == other.value)
end

#gt(other) ⇒ Boolean

The SassScript > operation.

Raises:

  • (NoMethodError) —

    if other is an invalid type



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# File 'lib/sass/script/number.rb', line 226

def gt(other)
  raise NoMethodError.new(nil, :gt) unless other.is_a?(Number)
  operate(other, :>)
end

#gte(other) ⇒ Boolean

The SassScript >= operation.

Raises:

  • (NoMethodError) —

    if other is an invalid type



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# File 'lib/sass/script/number.rb', line 236

def gte(other)
  raise NoMethodError.new(nil, :gte) unless other.is_a?(Number)
  operate(other, :>=)
end

#inspect(opts = {}) ⇒ String Also known as: to_sass

Returns a readable representation of this number.

This representation is valid CSS (and valid SassScript) as long as there is only one unit.



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# File 'lib/sass/script/number.rb', line 276

def inspect(opts = {})
  value = self.class.round(self.value)
  unitless? ? value.to_s : "#{value}#{unit_str}"
end

#int? ⇒ Boolean 



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# File 'lib/sass/script/number.rb', line 290

def int?
  value % 1 == 0.0
end

#legal_units? ⇒ Boolean 



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# File 'lib/sass/script/number.rb', line 301

def legal_units?
  (@numerator_units.empty? || @numerator_units.size == 1) && @denominator_units.empty?
end

#lt(other) ⇒ Boolean

The SassScript < operation.

Raises:

  • (NoMethodError) —

    if other is an invalid type



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# File 'lib/sass/script/number.rb', line 246

def lt(other)
  raise NoMethodError.new(nil, :lt) unless other.is_a?(Number)
  operate(other, :<)
end

#lte(other) ⇒ Boolean

The SassScript <= operation.

Raises:

  • (NoMethodError) —

    if other is an invalid type



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# File 'lib/sass/script/number.rb', line 256

def lte(other)
  raise NoMethodError.new(nil, :lte) unless other.is_a?(Number)
  operate(other, :<=)
end

#minus(other) ⇒ Literal

The SassScript binary - operation (e.g. $a - $b). Its functionality depends on the type of its argument:

Sass::Script::Number : Subtracts this number from the other, converting units if possible.

Literal : See Literal#minus.

Raises:



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# File 'lib/sass/script/number.rb', line 117

def minus(other)
  if other.is_a? Number
    operate(other, :-)
  else
    super
  end
end

#mod(other) ⇒ Number

The SassScript % operation.

Raises:



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# File 'lib/sass/script/number.rb', line 190

def mod(other)
  if other.is_a?(Number)
    unless other.unitless?
      raise Sass::UnitConversionError.new("Cannot modulo by a number with units: #{other.inspect}.")
    end
    operate(other, :%)
  else
    raise NoMethodError.new(nil, :mod)
  end
end

#plus(other) ⇒ Literal

The SassScript + operation. Its functionality depends on the type of its argument:

Sass::Script::Number : Adds the two numbers together, converting units if possible.

Color : Adds this number to each of the RGB color channels.

Literal : See Literal#plus.

Raises:



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# File 'lib/sass/script/number.rb', line 95

def plus(other)
  if other.is_a? Number
    operate(other, :+)
  elsif other.is_a?(Color)
    other.plus(self)
  else
    super
  end
end

#times(other) ⇒ Number, Color

The SassScript * operation. Its functionality depends on the type of its argument:

Sass::Script::Number : Multiplies the two numbers together, converting units appropriately.

Color : Multiplies each of the RGB color channels by this number.

Raises:

  • (NoMethodError) —

    if other is an invalid type



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# File 'lib/sass/script/number.rb', line 151

def times(other)
  if other.is_a? Number
    operate(other, :*)
  elsif other.is_a? Color
    other.times(self)
  else
    raise NoMethodError.new(nil, :times)
  end
end

#to_i ⇒ Fixnum

Returns The integer value of the number.

Raises:



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# File 'lib/sass/script/number.rb', line 284

def to_i
  super unless int?
  return value
end

#to_s(opts = {}) ⇒ String

Returns The CSS representation of this number.

Raises:

  • (Sass::SyntaxError) —

    if this number has units that can't be used in CSS (e.g. px*in)



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# File 'lib/sass/script/number.rb', line 264

def to_s(opts = {})
  return original if original
  raise Sass::SyntaxError.new("#{inspect} isn't a valid CSS value.") unless legal_units?
  inspect
end

#unary_minus ⇒ Number

The SassScript unary - operation (e.g. -$a).



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# File 'lib/sass/script/number.rb', line 135

def unary_minus
  Number.new(-value, @numerator_units, @denominator_units)
end

#unary_plus ⇒ Number

The SassScript unary + operation (e.g. +$a).



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# File 'lib/sass/script/number.rb', line 128

def unary_plus
  self
end

#unit_str ⇒ String

Returns a human readable representation of the units in this number. For complex units this takes the form of: numerator_unit1 * numerator_unit2 / denominator_unit1 * denominator_unit2



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# File 'lib/sass/script/number.rb', line 345

def unit_str
  rv = @numerator_units.sort.join("*")
  if @denominator_units.any?
    rv << "/"
    rv << @denominator_units.sort.join("*")
  end
  rv
end

#unitless? ⇒ Boolean 



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# File 'lib/sass/script/number.rb', line 295

def unitless?
  @numerator_units.empty? && @denominator_units.empty?
end