Class: Opal::Nodes::MassAssignNode

Inherits:
Base show all
Defined in:
opal/lib/opal/nodes/masgn.rb

Constant Summary

Constants included from Helpers

Helpers::BASIC_IDENTIFIER_RULES, Helpers::ES3_RESERVED_WORD_EXCLUSIVE, Helpers::ES51_RESERVED_WORD, Helpers::IMMUTABLE_PROPS

Instance Attribute Summary

Attributes inherited from Base

#compiler, #type

Instance Method Summary collapse

Methods inherited from Base

#add_gvar, #add_ivar, #add_local, #add_temp, children, #children, #compile_to_fragments, #error, #expr, #expr?, #expr_or_nil, #fragment, handle, handlers, #helper, #in_while?, #initialize, #process, #push, #recv, #recv?, #s, #scope, #stmt, #stmt?, #unshift, #while_loop, #with_temp, #wrap

Methods included from Helpers

#current_indent, #empty_line, #indent, #js_falsy, #js_truthy, #js_truthy_optimize, #line, #lvar_to_js, #mid_to_jsid, #property, #valid_name?, #variable

Constructor Details

This class inherits a constructor from Opal::Nodes::Base

Instance Method Details

#compile ⇒ Object

[View source]

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# File 'opal/lib/opal/nodes/masgn.rb', line 10

def compile
  tmp = scope.new_temp
  len = 0 # how many rhs items are we sure we have

  if rhs.type == :array
    len = rhs.size - 1
    push "#{tmp} = ", expr(rhs)
  elsif rhs.type == :to_ary
    push "#{tmp} = Opal.to_ary(", expr(rhs[1]), ")"
  elsif rhs.type == :splat
    push "(#{tmp} = ", expr(rhs[1]), ")['$to_a'] && !#{tmp}['$to_a'].$$stub ? (#{tmp} = #{tmp}['$to_a']())"
    push " : (#{tmp}).$$is_array ? #{tmp} : (#{tmp} = [#{tmp}])"
  else
    raise "unsupported mlhs type"
  end

  lhs.children.each_with_index do |child, idx|
    push ', '

    if child.type == :splat
      if part = child[1]
        part = part.dup
        part << s(:js_tmp, "$slice.call(#{tmp}, #{idx})")
        push expr(part)
      end
    else
      if idx >= len
        assign = s(:js_tmp, "(#{tmp}[#{idx}] == null ? nil : #{tmp}[#{idx}])")
      else
        assign = s(:js_tmp, "#{tmp}[#{idx}]")
      end

      part = child.dup
      if child.type == :lasgn or child.type == :iasgn or child.type == :lvar or child.type == :gasgn
        part << assign
      elsif child.type == :call
        part[2] = "#{part[2]}=".to_sym
        part.last << assign
      elsif child.type == :attrasgn
        part.last << assign
      else
        raise "Bad lhs for masgn"
      end

      push expr(part)
    end
  end

  scope.queue_temp tmp
end