| Class | Sass::Script::UnaryOperation |
| In: |
lib/sass/script/unary_operation.rb
|
| Parent: | Node |
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<Node>] @see Node#children
# File lib/sass/script/unary_operation.rb, line 37
37: def children
38: [@operand]
39: 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