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

#on_class(node) ⇒ Object 



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# File 'lib/ruby2js/filter/esm.rb', line 79

def on_class(node)
  @esm_explicit_tokens << node.children.first.children.last

  super
end

#on_const(node) ⇒ Object 



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# File 'lib/ruby2js/filter/esm.rb', line 163

def on_const(node)
  if node.children.first == nil and found_import = find_autoimport(node.children.last)
    prepend_list << s(:import, found_import[0], found_import[1])

    values = @esm_defs[node.children.last]
    
    if values
      values = values.map {|value| 
        if value.to_s.start_with? "@" 
          [value.to_s[1..-1].to_sym, s(:self)]
        else
          [value.to_sym, s(:autobind, s(:self))]
        end
      }.to_h

      @namespace.defineProps values, [node.children.last]
    end
  end

  super
end

#on_def(node) ⇒ Object 



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# File 'lib/ruby2js/filter/esm.rb', line 85

def on_def(node)
  @esm_explicit_tokens << node.children.first

  super
end

#on_export(node) ⇒ Object 



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# File 'lib/ruby2js/filter/esm.rb', line 185

def on_export(node)
  s(:export, *process_all(node.children))
end

#on_lvasgn(node) ⇒ Object 



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# File 'lib/ruby2js/filter/esm.rb', line 91

def on_lvasgn(node)
  @esm_explicit_tokens << node.children.first

  super
end

#on_send(node) ⇒ Object 



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# File 'lib/ruby2js/filter/esm.rb', line 97

def on_send(node)
  target, method, *args = node.children
  return super unless target.nil?

  if method == :import or (method == :require and @esm_top&.include? @ast)
    # don't do the conversion if the word import is followed by a paren
    if node.loc.respond_to? :selector
      selector = node.loc.selector
      if selector and selector.source_buffer
        return super if selector.source_buffer.source[selector.end_pos] == '('
      end
    end

    if args[0].type == :str and args.length == 1
      # import "file.css"
      #   => import "file.css"
      s(:import, args[0].children[0])
    elsif args.length == 1 and \
      args[0].type == :send and \
      args[0].children[0].nil? and \
      args[0].children[2].type == :send and \
      args[0].children[2].children[0].nil? and \
      args[0].children[2].children[1] == :from and \
      args[0].children[2].children[2].type == :str
      # import name from "file.js"
      #  => import name from "file.js"
      @esm_explicit_tokens << args[0].children[1]

      s(:import,
        [args[0].children[2].children[2].children[0]],
        process(s(:attr, nil, args[0].children[1])))

    else
      # import Stuff, "file.js"
      #   => import Stuff from "file.js"
      # import Stuff, from: "file.js"
      #   => import Stuff from "file.js"
      # import Stuff, as: "*", from: "file.js"
      #   => import Stuff as * from "file.js"
      # import [ Some, Stuff ], from: "file.js"
      #   => import { Some, Stuff } from "file.js"
      # import Some, [ More, Stuff ], from: "file.js"
      #   => import Some, { More, Stuff } from "file.js"
      imports = []
      if i(const send str).include? args[0].type
        @esm_explicit_tokens << args[0].children.last
        imports << process(args.shift)
      end

      if args[0].type == :array
        args[0].children.each {|i| @esm_explicit_tokens << i.children.last}
        imports << process_all(args.shift.children)
      end

      s(:import, args[0].children, *imports) unless args[0].nil?
    end
  elsif method == :export          
    s(:export, *process_all(args))
  elsif target.nil? and found_import = find_autoimport(method)
    prepend_list << s(:import, found_import[0], found_import[1])
    super
  else
    super
  end
end

#options=(options) ⇒ Object 



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# File 'lib/ruby2js/filter/esm.rb', line 10

def options=(options)
  super
  @esm_autoexports = !@disable_autoexports && options[:autoexports]
  @esm_autoimports = options[:autoimports]
  @esm_defs = options[:defs] || {}
  @esm_explicit_tokens = Set.new
  @esm_top = nil

  # don't convert requires if Require filter is included
  filters = options[:filters] || Filter::DEFAULTS
  if \
    defined? Ruby2JS::Filter::Require and
    filters.include? Ruby2JS::Filter::Require
  then
    @esm_top = []
  end
end

#process(node) ⇒ Object 



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# File 'lib/ruby2js/filter/esm.rb', line 28

def process(node)
  return super if @esm_top

  list = [node]
  while list.length == 1 and list.first.type == :begin
    list = list.first.children.dup
  end

  @esm_top = list

  return super unless @esm_autoexports

  replaced = []
  list.map! do |child|
    replacement = child

    if [:module, :class].include? child.type and
      child.children.first.type == :const and
      child.children.first.children.first == nil \
    then
      replacement = s(:export, child)
    elsif child.type == :casgn and child.children.first == nil
      replacement = s(:export, child)
    elsif child.type == :def
      replacement = s(:export, child)
    end

    if replacement != child
      replaced << replacement
      @comments[replacement] = @comments[child] if @comments[child]
    end

    replacement
  end

  if replaced.length == 1 and @esm_autoexports == :default
    list.map! do |child|
      if child == replaced.first
        replacement = s(:export, s(:send, nil, :default, *child.children))
        @comments[replacement] = @comments[child] if @comments[child]
        replacement
      else
        child
      end
    end
  end

  @esm_autoexports = false
  process s(:begin, *list)
end