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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
# @see Node#deep_copy
def deep_copy
node = dup
node.instance_variable_set('@operand', @operand.deep_copy)
node
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
Version data entries
484 entries across 199 versions & 9 rubygems