Contents

# frozen_string_literal: true
require 'opal/nodes/base'

module Opal
  module Nodes
    class UndefNode < Base
      handle :undef

      children :value

      def compile
        children.each do |child|
          line "Opal.udef(self, '$' + ", expr(child), ");"
        end
      end
    end

    class AliasNode < Base
      handle :alias

      children :new_name, :old_name

      def compile
        push "Opal.alias(self, ", expr(new_name), ", ", expr(old_name), ")"
      end
    end

    class BeginNode < ScopeNode
      handle :begin

      def compile
        return push "nil" if children.empty?

        if stmt?
          compile_children(children, @level)
        elsif simple_children?
          compile_inline_children(children, @level)
          wrap '(', ')' if children.size > 1
        elsif children.size == 1
          compile_inline_children(returned_children, @level)
        else
          compile_children(returned_children, @level)
          wrap '(function() {', '})()'
        end
      end

      def returned_children
        @returned_children ||= begin
          *rest, last_child = *children
          if last_child
            rest + [compiler.returns(last_child)]
          else
            [s(:nil)]
          end
        end
      end

      def compile_children(children, level)
        children.each do |child|
          line process(child, level), ";"
        end
      end

      COMPLEX_CHILDREN = [:while, :while_post, :until, :until_post, :until, :js_return]

      def simple_children?
        children.none? do |child|
          COMPLEX_CHILDREN.include?(child.type)
        end
      end

      def compile_inline_children(children, level)
        children.each_with_index do |child, idx|
          push ', ' unless idx == 0
          push process(child, level)
        end
      end
    end

    class KwBeginNode < BeginNode
      handle :kwbegin
    end
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
opal-0.11.0.rc1	lib/opal/nodes/definitions.rb