A SassScript parse node representing a unary operation, such as `-$b` or `not true`.
Currently only `-`, `/`, and `not` are unary operators.
@return [Script::Node] The parse-tree node for the object of the operator
@return [Symbol] The operation to perform
@param operand [Script::Node] See {#operand} @param operator [Symbol] See {#operator}
# File lib/sass/script/unary_operation.rb, line 15 def initialize(operand, operator) @operand = operand @operator = operator super() end
Returns the operand of the operation.
@return [Array<Node>] @see Sass::Script::Node#children
# File lib/sass/script/unary_operation.rb, line 42 def children [@operand] end
@see Sass::Script::Node#deep_copy
# File lib/sass/script/unary_operation.rb, line 47 def deep_copy node = dup node.instance_variable_set('@operand', @operand.deep_copy) node end
@return [String] A human-readable s-expression representation of the operation
# File lib/sass/script/unary_operation.rb, line 22 def inspect "(#{@operator.inspect} #{@operand.inspect})" end
@see Sass::Script::Node#to_sass
# File lib/sass/script/unary_operation.rb, line 27 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 =~ %r[a-z]/ ? " " : "") + operand end
Evaluates the operation.
@param environment [Sass::Environment] The environment in which to evaluate the SassScript @return [Literal] The SassScript object that is the value of the operation @raise [Sass::SyntaxError] if the operation is undefined for the operand
# File lib/sass/script/unary_operation.rb, line 60 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