Class: Sass::Script::Tree::Operation

Inherits:
Node
  • Object
show all
Defined in:
lib/sass/script/tree/operation.rb

Overview

A SassScript parse node representing a binary operation, such as $a + $b or "foo" + 1.

Instance Attribute Summary collapse

Attributes inherited from Node

#filename, #line, #options, #source_range

Instance Method Summary collapse

Methods inherited from Node

#dasherize, #force_division!, #opts, #perform

Constructor Details

#initialize(operand1, operand2, operator) ⇒ Operation

Returns a new instance of Operation.

Parameters:



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# File 'lib/sass/script/tree/operation.rb', line 15

def initialize(operand1, operand2, operator)
  @operand1 = operand1
  @operand2 = operand2
  @operator = operator
  super()
end

Instance Attribute Details

#operand1 (readonly)

Returns the value of attribute operand1.



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# File 'lib/sass/script/tree/operation.rb', line 5

def operand1
  @operand1
end

#operand2 (readonly)

Returns the value of attribute operand2.



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# File 'lib/sass/script/tree/operation.rb', line 6

def operand2
  @operand2
end

#operator (readonly)

Returns the value of attribute operator.



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# File 'lib/sass/script/tree/operation.rb', line 7

def operator
  @operator
end

Instance Method Details

#_perform(environment) ⇒ Sass::Script::Value (protected)

Evaluates the operation.

Parameters:

  • environment (Sass::Environment) —

    The environment in which to evaluate the SassScript

Returns:

Raises:



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# File 'lib/sass/script/tree/operation.rb', line 63

def _perform(environment)
  value1 = @operand1.perform(environment)

  # Special-case :and and :or to support short-circuiting.
  if @operator == :and
    return value1.to_bool ? @operand2.perform(environment) : value1
  elsif @operator == :or
    return value1.to_bool ? value1 : @operand2.perform(environment)
  end

  value2 = @operand2.perform(environment)

  if (value1.is_a?(Sass::Script::Value::Null) || value2.is_a?(Sass::Script::Value::Null)) &&
      @operator != :eq && @operator != :neq
    raise Sass::SyntaxError.new(
      "Invalid null operation: \"#{value1.inspect} #{@operator} #{value2.inspect}\".")
  end

  begin
    result = opts(value1.send(@operator, value2))
  rescue NoMethodError => e
    raise e unless e.name.to_s == @operator.to_s
    raise Sass::SyntaxError.new("Undefined operation: \"#{value1} #{@operator} #{value2}\".")
  end

  if (@operator == :eq || @operator == :neq) && value1.is_a?(Sass::Script::Value::Number) &&
     value2.is_a?(Sass::Script::Value::Number) && value1.unitless? != value2.unitless? &&
     result == (if @operator == :eq
                  Sass::Script::Value::Bool::TRUE
                else
                  Sass::Script::Value::Bool::FALSE
                end)

    operation = "#{value1} #{@operator == :eq ? '==' : '!='} #{value2}"
    future_value = @operator == :neq
    Sass::Util.sass_warn <<WARNING
DEPRECATION WARNING on line #{line}#{" of #{filename}" if filename}:
The result of `#{operation}` will be `#{future_value}` in future releases of Sass.
Unitless numbers will no longer be equal to the same numbers with units.
WARNING
  end

  result
end

#children ⇒ Array<Node>

Returns the operands for this operation.

Returns:

See Also:



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# File 'lib/sass/script/tree/operation.rb', line 44

def children
  [@operand1, @operand2]
end

#deep_copy

See Also:



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# File 'lib/sass/script/tree/operation.rb', line 49

def deep_copy
  node = dup
  node.instance_variable_set('@operand1', @operand1.deep_copy)
  node.instance_variable_set('@operand2', @operand2.deep_copy)
  node
end

#inspect ⇒ String

Returns A human-readable s-expression representation of the operation.

Returns:

  • (String) —

    A human-readable s-expression representation of the operation



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# File 'lib/sass/script/tree/operation.rb', line 23

def inspect
  "(#{@operator.inspect} #{@operand1.inspect} #{@operand2.inspect})"
end

#to_sass(opts = {})

See Also:



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# File 'lib/sass/script/tree/operation.rb', line 28

def to_sass(opts = {})
  o1 = operand_to_sass @operand1, :left, opts
  o2 = operand_to_sass @operand2, :right, opts
  sep =
    case @operator
    when :comma; ", "
    when :space; " "
    else; " #{Sass::Script::Lexer::OPERATORS_REVERSE[@operator]} "
    end
  "#{o1}#{sep}#{o2}"
end