Class: Sass::Script::Value::Number

Inherits:
Base
  • Object
show all
Defined in:
lib/sass/script/value/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 Base

#options, #source_range

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Base

#==, #_perform, #assert_int!, #bracketed, #neq, #null?, #separator, #single_eq, #to_a, #to_bool, #to_h, #unary_div, #unary_not, #with_contents

Constructor Details

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



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# File 'lib/sass/script/value/number.rb', line 70

def initialize(value, numerator_units = NO_UNITS, denominator_units = NO_UNITS)
  numerator_units = [numerator_units] if numerator_units.is_a?(::String)
  denominator_units = [denominator_units] if denominator_units.is_a?(::String)
  super(value)
  @numerator_units = numerator_units
  @denominator_units = denominator_units
  @options = nil
  normalize!
end

Instance Attribute Details

#denominator_unitsArray<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/value/number.rb', line 24

def denominator_units
  @denominator_units
end

#numerator_unitsArray<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/value/number.rb', line 19

def numerator_units
  @numerator_units
end

#originalBoolean?

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/value/number.rb', line 34

def original
  @original
end

#valueNumeric (readonly)

The Ruby value of the number.



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# File 'lib/sass/script/value/number.rb', line 14

def value
  @value
end

Class Method Details

.epsilon

Used in checking equality of floating point numbers. Any numbers within an epsilon of each other are considered functionally equal. The value for epsilon is one tenth of the current numeric precision.



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# File 'lib/sass/script/value/number.rb', line 60

def self.epsilon
  Thread.current[:sass_numeric_epsilon] ||= 1 / (precision_factor * 10)
end

.precision



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

def self.precision
  Thread.current[:sass_numeric_precision] || Thread.main[:sass_numeric_precision] || 10
end

.precision=(digits)

Sets the number of digits of precision For example, if this is 3, 3.1415926 will be printed as 3.142. The numeric precision is stored as a thread local for thread safety reasons. To set for all threads, be sure to set the precision on the main thread.



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

def self.precision=(digits)
  Thread.current[:sass_numeric_precision] = digits.round
  Thread.current[:sass_numeric_precision_factor] = nil
  Thread.current[:sass_numeric_epsilon] = nil
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/value/number.rb', line 53

def self.precision_factor
  Thread.current[:sass_numeric_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/value/number.rb', line 367

def coerce(num_units, den_units)
  Number.new(if unitless?
               value
             else
               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/value/number.rb', line 378

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

#div(other) ⇒ Value

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

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

Sass::Script::Value : See Base#div.



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

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

#eq(other) ⇒ Boolean

The SassScript == operation.



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# File 'lib/sass/script/value/number.rb', line 203

def eq(other)
  return Bool::FALSE unless other.is_a?(Sass::Script::Value::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 Bool::FALSE
  end
  Bool.new(basically_equal?(this.value, other.value))
end

#eql?(other) ⇒ Boolean

Hash-equality works differently than == equality for numbers. Hash-equality must be transitive, so it just compares the exact value, numerator units, and denominator units.



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# File 'lib/sass/script/value/number.rb', line 225

def eql?(other)
  basically_equal?(value, other.value) && numerator_units == other.numerator_units &&
    denominator_units == other.denominator_units
end

#gt(other) ⇒ Boolean

The SassScript > operation.

Raises:

  • (NoMethodError)

    if other is an invalid type



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# File 'lib/sass/script/value/number.rb', line 235

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/value/number.rb', line 245

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

#hash



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# File 'lib/sass/script/value/number.rb', line 218

def hash
  [value, numerator_units, denominator_units].hash
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/value/number.rb', line 285

def inspect(opts = {})
  return original if original

  value = self.class.round(self.value)
  str = value.to_s

  # Ruby will occasionally print in scientific notation if the number is
  # small enough. That's technically valid CSS, but it's not well-supported
  # and confusing.
  str = ("%0.#{self.class.precision}f" % value).gsub(/0*$/, '') if str.include?('e')

  # Sometimes numeric formatting will result in a decimal number with a trailing zero (x.0)
  if str =~ /(.*)\.0$/
    str = $1
  end

  # We omit a leading zero before the decimal point in compressed mode.
  if @options && options[:style] == :compressed
    str.sub!(/^(-)?0\./, '\1.')
  end

  unitless? ? str : "#{str}#{unit_str}"
end

#int?Boolean



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# File 'lib/sass/script/value/number.rb', line 318

def int?
  basically_equal?(value % 1, 0.0)
end

#is_unit?(unit) ⇒ Boolean

Checks whether the number has the numerator unit specified.

Examples:

number = Sass::Script::Value::Number.new(10, "px")
number.is_unit?("px") => true
number.is_unit?(nil) => false

See Also:



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# File 'lib/sass/script/value/number.rb', line 337

def is_unit?(unit)
  if unit
    denominator_units.size == 0 && numerator_units.size == 1 && numerator_units.first == unit
  else
    unitless?
  end
end


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# File 'lib/sass/script/value/number.rb', line 347

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/value/number.rb', line 255

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/value/number.rb', line 265

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

#minus(other) ⇒ Value

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

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

Sass::Script::Value : See Base#minus.

Raises:



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

def mod(other)
  if other.is_a?(Number)
    return Number.new(Float::NAN) if other.value == 0
    operate(other, :%)
  else
    raise NoMethodError.new(nil, :mod)
  end
end

#plus(other) ⇒ Value

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

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

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

Sass::Script::Value : See Base#plus.

Raises:



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# File 'lib/sass/script/value/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::Value::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/value/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_iInteger

Returns The integer value of the number

Raises:



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# File 'lib/sass/script/value/number.rb', line 312

def to_i
  super unless int?
  value.to_i
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/value/number.rb', line 273

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_minusNumber

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



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

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

#unary_plusNumber

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



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

def unary_plus
  self
end

#unit_strString

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/value/number.rb', line 389

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/value/number.rb', line 323

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