lib/sass/tree/for_node.rb
require 'sass/tree/node' module Sass::Tree # A dynamic node representing a Sass `@for` loop. # # @see Sass::Tree class ForNode < Node # @param var [String] The name of the loop variable # @param from [Script::Node] The parse tree for the initial expression # @param to [Script::Node] The parse tree for the final expression # @param exclusive [Boolean] Whether to include `to` in the loop # or stop just before def initialize(var, from, to, exclusive) @var = var @from = from @to = to @exclusive = exclusive super() end protected # @see Node#to_src def to_src(tabs, opts, fmt) to = @exclusive ? "to" : "through" "#{' ' * tabs}@for $#{dasherize(@var, opts)} from #{@from.to_sass(opts)} #{to} #{@to.to_sass(opts)}" + children_to_src(tabs, opts, fmt) end # Runs the child nodes once for each time through the loop, # varying the variable each time. # # @param environment [Sass::Environment] The lexical environment containing # variable and mixin values # @return [Array<Tree::Node>] The resulting static nodes # @see Sass::Tree def _perform(environment) from = @from.perform(environment) to = @to.perform(environment) from.assert_int! to.assert_int! to = to.coerce(from.numerator_units, from.denominator_units) range = Range.new(from.to_i, to.to_i, @exclusive) children = [] environment = Sass::Environment.new(environment) range.each do |i| environment.set_local_var(@var, Sass::Script::Number.new(i, from.numerator_units, from.denominator_units)) children += perform_children(environment) end children end # Returns an error message if the given child node is invalid, # and false otherwise. # # {ExtendNode}s are valid within {ForNode}s. # # @param child [Tree::Node] A potential child node. # @return [Boolean, String] Whether or not the child node is valid, # as well as the error message to display if it is invalid def invalid_child?(child) super unless child.is_a?(ExtendNode) end end end