Class: Sass::Script::UnaryOperation

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

Overview

A SassScript parse node representing a unary operation, such as -$b or not true.

Currently only -, /, and not are unary operators.

Instance Attribute Summary

Attributes inherited from Node

#line, #options

Instance Method Summary collapse

Methods inherited from Node

#dasherize, #opts, #perform

Constructor Details

#initialize(operand, operator) ⇒ UnaryOperation

Returns a new instance of UnaryOperation.

Parameters:

  • operand (Script::Node) —

    The parse-tree node for the object of the operator

  • operator (Symbol) —

    The operator to perform



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# File 'lib/sass/script/unary_operation.rb', line 10

def initialize(operand, operator)
  @operand = operand
  @operator = operator
  super()
end

Instance Method Details

#_perform(environment) ⇒ Literal (protected)

Evaluates the operation.

Parameters:

  • environment (Sass::Environment) —

    The environment in which to evaluate the SassScript

Returns:

  • (Literal) —

    The SassScript object that is the value of the operation

Raises:



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# File 'lib/sass/script/unary_operation.rb', line 55

def _perform(environment)
  operator = "unary_#{@operator}"
  literal = @operand.perform(environment)
  literal.send(operator)
rescue NoMethodError => e
  raise e unless e.name.to_s == operator.to_s
  raise Sass::SyntaxError.new("Undefined unary operation: \"#{@operator} #{literal}\".")
end

#children ⇒ Array<Node>

Returns the operand of the operation.

Returns:

See Also:



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# File 'lib/sass/script/unary_operation.rb', line 37

def children
  [@operand]
end

#deep_copy

See Also:



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# File 'lib/sass/script/unary_operation.rb', line 42

def deep_copy
  node = dup
  node.instance_variable_set('@operand', @operand.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/unary_operation.rb', line 17

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

#to_sass(opts = {})

See Also:



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# File 'lib/sass/script/unary_operation.rb', line 22

def to_sass(opts = {})
  operand = @operand.to_sass(opts)
  if @operand.is_a?(Operation) ||
      (@operator == :minus &&
       (operand =~ Sass::SCSS::RX::IDENT) == 0)
    operand = "(#{@operand.to_sass(opts)})"
  end
  op = Lexer::OPERATORS_REVERSE[@operator]
  op + (op =~ /[a-z]/ ? " " : "") + operand
end