/scalate-jruby/src/main/resources/haml-3.0.25/lib/sass/script/unary_operation.rb
http://github.com/scalate/scalate · Ruby · 57 lines · 34 code · 5 blank · 18 comment · 4 complexity · b5bb7309afa4bd4f216fcafdcf2eee9b MD5 · raw file
- module Sass::Script
- # A SassScript parse node representing a unary operation,
- # such as `-$b` or `not true`.
- #
- # Currently only `-`, `/`, and `not` are unary operators.
- class UnaryOperation < Node
- # @param operand [Script::Node] The parse-tree node
- # for the object of the operator
- # @param operator [Symbol] The operator to perform
- def initialize(operand, operator)
- @operand = operand
- @operator = operator
- super()
- end
- # @return [String] A human-readable s-expression representation of the operation
- def inspect
- "(#{@operator.inspect} #{@operand.inspect})"
- end
- # @see Node#to_sass
- 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
- # Returns the operand of the operation.
- #
- # @return [Array<Node>]
- # @see Node#children
- def children
- [@operand]
- end
- protected
- # 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
- 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
- end
- end