Module: Ruby2JS::Filter::ESM

Includes:
SEXP
Defined in:
lib/ruby2js/filter/esm.rb

Instance Method Summary collapse

Methods included from SEXP

#S, #s

Instance Method Details

#esm_walk(node) ⇒ Object

gather constants



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# File 'lib/ruby2js/filter/esm.rb', line 46

def esm_walk(node)
  # extract ivars and cvars
  if node.type == :const and node.children.first == nil
    @esm_include << node.children.last.to_s
  elsif node.type == :xnode
    name = node.children.first
    @esm_include << name unless name.empty? or name =~ /^[a-z]/
  elsif node.type == :casgn and node.children.first == nil
    @esm_exclude << node.children[1].to_s
  elsif node.type == :class and node.children.first.type == :const
    if node.children.first.children.first == nil
      name = node.children.first.children.last.to_s
      @esm_exclude << name
      @esm_export ||= name
    end
  end

  # recurse
  node.children.each do |child|
    esm_walk(child) if Parser::AST::Node === child
  end
end

#initialize(*args) ⇒ Object 



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# File 'lib/ruby2js/filter/esm.rb', line 8

def initialize(*args)
  @esm_include = nil
  super
end

#process(node) ⇒ Object 



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# File 'lib/ruby2js/filter/esm.rb', line 13

def process(node)
  return super if @esm_include
  @esm_include = Set.new
  @esm_exclude = Set.new
  @esm_export = nil
  result = super

  esm_walk(result)

  inventory = (@esm_include - @esm_exclude).to_a.sort

  if inventory.empty? and not @esm_export
    result
  else
    list = inventory.map do |name|
       if name == "React" and defined? Ruby2JS::Filter::React
         s(:import, "#{name.downcase}", s(:const, nil, name))
       elsif not %w(JSON Object).include? name
         s(:import, "./#{name.downcase}.js", s(:const, nil, name))
       end
    end

    list.push result

    if @esm_export
      list.push s(:export, :default, s(:const, nil, @esm_export))
    end

    s(:begin, *list.compact)
  end
end