/scalate-jruby/src/main/resources/haml-3.0.25/lib/sass/script/operation.rb
http://github.com/scalate/scalate · Ruby · 95 lines · 64 code · 12 blank · 19 comment · 11 complexity · 70c0ece5db9526ca44a08275cd8e1957 MD5 · raw file
- require 'set'
- require 'sass/script/string'
- require 'sass/script/number'
- require 'sass/script/color'
- require 'sass/script/functions'
- require 'sass/script/unary_operation'
- require 'sass/script/interpolation'
- require 'sass/script/string_interpolation'
- module Sass::Script
- # A SassScript parse node representing a binary operation,
- # such as `$a + $b` or `"foo" + 1`.
- class Operation < Node
- attr_reader :operand1
- attr_reader :operand2
- attr_reader :operator
- # @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}
- def initialize(operand1, operand2, operator)
- @operand1 = operand1
- @operand2 = operand2
- @operator = operator
- super()
- end
- # @return [String] A human-readable s-expression representation of the operation
- def inspect
- "(#{@operator.inspect} #{@operand1.inspect} #{@operand2.inspect})"
- end
- # @see Node#to_sass
- 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 :concat; " "
- else; " #{Lexer::OPERATORS_REVERSE[@operator]} "
- end
- "#{o1}#{sep}#{o2}"
- end
- # Returns the operands for this operation.
- #
- # @return [Array<Node>]
- # @see Node#children
- def children
- [@operand1, @operand2]
- 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 operands
- def _perform(environment)
- literal1 = @operand1.perform(environment)
- literal2 = @operand2.perform(environment)
- if @operator == :concat && context == :equals
- literal1 = Sass::Script::String.new(literal1.value) if literal1.is_a?(Sass::Script::String)
- literal2 = Sass::Script::String.new(literal2.value) if literal2.is_a?(Sass::Script::String)
- 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
- private
- def operand_to_sass(op, side, opts)
- return op.to_sass(opts) unless op.is_a?(Operation)
- pred = Sass::Script::Parser.precedence_of(@operator)
- sub_pred = Sass::Script::Parser.precedence_of(op.operator)
- assoc = Sass::Script::Parser.associative?(@operator)
- return "(#{op.to_sass(opts)})" if sub_pred < pred ||
- (side == :right && sub_pred == pred && !assoc)
- op.to_sass(opts)
- end
- end
- end