A SassScript parse node representing a binary operation, such as `$a + $b` or `“foo” + 1`.
@param operand1 [Script::Node] The parse-tree node
for the right-hand side of the operator
@param operand2 [Script::Node] The parse-tree node
for the left-hand side of the operator
@param operator [Symbol] The operator to perform.
This should be one of the binary operator names in {Lexer::OPERATORS}
# File lib/sass/script/operation.rb, line 24 def initialize(operand1, operand2, operator) @operand1 = operand1 @operand2 = operand2 @operator = operator super() end
Returns the operands for this operation.
@return [Array<Node>] @see Sass::Script::Node#children
# File lib/sass/script/operation.rb, line 54 def children [@operand1, @operand2] end
@see Sass::Script::Node#deep_copy
# File lib/sass/script/operation.rb, line 59 def deep_copy node = dup node.instance_variable_set('@operand1', @operand1.deep_copy) node.instance_variable_set('@operand2', @operand2.deep_copy) node end
@return [String] A human-readable s-expression representation of the operation
# File lib/sass/script/operation.rb, line 32 def inspect "(#{@operator.inspect} #{@operand1.inspect} #{@operand2.inspect})" end
@see Sass::Script::Node#to_sass
# File lib/sass/script/operation.rb, line 37 def to_sass(opts = {}) pred = Sass::Script::Parser.precedence_of(@operator) o1 = operand_to_sass @operand1, :left, opts o2 = operand_to_sass @operand2, :right, opts sep = case @operator when :comma; ", " when :space; " " else; " #{Lexer::OPERATORS_REVERSE[@operator]} " end "#{o1}#{sep}#{o2}" 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 operands
# File lib/sass/script/operation.rb, line 73 def _perform(environment) literal1 = @operand1.perform(environment) # Special-case :and and :or to support short-circuiting. if @operator == :and return literal1.to_bool ? @operand2.perform(environment) : literal1 elsif @operator == :or return literal1.to_bool ? literal1 : @operand2.perform(environment) end literal2 = @operand2.perform(environment) if (literal1.is_a?(Null) || literal2.is_a?(Null)) && @operator != :eq && @operator != :neq raise Sass::SyntaxError.new("Invalid null operation: \"#{literal1.inspect} #{@operator} #{literal2.inspect}\".") end begin opts(literal1.send(@operator, literal2)) rescue NoMethodError => e raise e unless e.name.to_s == @operator.to_s raise Sass::SyntaxError.new("Undefined operation: \"#{literal1} #{@operator} #{literal2}\".") end end