A SassScript parse node representing a unary operation, such as `-$b` or `not true`.
Currently only `-`, `/`, and `not` are unary operators.
@param operand [Script::Node] The parse-tree node
for the object of the operator
@param operator [Symbol] The operator to perform
# File lib/sass/script/unary_operation.rb, line 10 10: def initialize(operand, operator) 11: @operand = operand 12: @operator = operator 13: super() 14: end
Returns the operand of the operation.
@return [Array
# File lib/sass/script/unary_operation.rb, line 37 37: def children 38: [@operand] 39: end
@return [String] A human-readable s-expression representation of the operation
# File lib/sass/script/unary_operation.rb, line 17 17: def inspect 18: "(#{@operator.inspect} #{@operand.inspect})" 19: end
@see Node#to_sass
# File lib/sass/script/unary_operation.rb, line 22 22: def to_sass(opts = {}) 23: operand = @operand.to_sass(opts) 24: if @operand.is_a?(Operation) || 25: (@operator == :minus && 26: (operand =~ Sass::SCSS::RX::IDENT) == 0) 27: operand = "(#{@operand.to_sass(opts)})" 28: end 29: op = Lexer::OPERATORS_REVERSE[@operator] 30: op + (op =~ /[a-z]/ ? " " : "") + operand 31: 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 48 48: def _perform(environment) 49: operator = "unary_#{@operator}" 50: literal = @operand.perform(environment) 51: literal.send(operator) 52: rescue NoMethodError => e 53: raise e unless e.name.to_s == operator.to_s 54: raise Sass::SyntaxError.new("Undefined unary operation: \"#{@operator} #{literal}\".") 55: end
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