Class: Opal::Nodes::MassAssignNode
- Defined in:
- opal/lib/opal/nodes/masgn.rb
Constant Summary collapse
- SIMPLE_ASSIGNMENT =
%i[lvasgnivasgnlvargvasgncdeclcasgn].freeze
Instance Attribute Summary
Attributes inherited from Base
Attributes included from Closure::NodeSupport
Instance Method Summary collapse
- #compile ⇒ Object
- #compile_assignment(child, array, idx, len = nil) ⇒ Object
-
#compile_masgn(lhs_items, array, len = nil) ⇒ Object
'len' is how many rhs items are we sure we have.
Methods inherited from Base
#add_gvar , #add_ivar , #add_local , #add_temp , #children , children , #class_variable_owner , #class_variable_owner_nesting_level , #comments , #compile_to_fragments , #error , #expr , #expr? , #expr_or_empty , #expr_or_nil , #fragment , handle , handlers , #has_rescue_else? , #helper , #in_ensure , #in_ensure? , #in_resbody , #in_resbody? , #in_rescue , #in_while? , #initialize , #process , #push , #recv , #recv? , #s , #scope , #source_location , #stmt , #stmt? , #top_scope , truthy_optimize? , #unshift , #while_loop , #with_temp , #wrap
Methods included from Closure::NodeSupport
#closure_is? , #compile_catcher , #generate_thrower , #generate_thrower_without_catcher , #in_closure , #pop_closure , #push_closure , #select_closure , #thrower
Methods included from Helpers
#current_indent , #empty_line , #indent , #js_truthy , #js_truthy_optimize , #line , #mid_to_jsid , #property , #valid_name?
Constructor Details
This class inherits a constructor from Opal::Nodes::Base
Instance Method Details
#compile ⇒ Object
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# File 'opal/lib/opal/nodes/masgn.rb', line 13 def compile with_temp do |array| if rhs.type == :array push "#{array} = ", expr(rhs) rhs_len = rhs.children.any? { |c| c.type == :splat } ? nil : rhs.children.size compile_masgn(lhs.children, array, rhs_len) push ", #{array}" # a mass assignment evaluates to the RHS else helper :to_ary with_temp do |retval| push "#{retval} = ", expr(rhs) push ", #{array} = $to_ary(#{retval})" compile_masgn(lhs.children, array) push ", #{retval}" end end end end
#compile_assignment(child, array, idx, len = nil) ⇒ Object
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# File 'opal/lib/opal/nodes/masgn.rb', line 76 def compile_assignment(child, array, idx, len = nil) assign = if !len || idx >= len s(:js_tmp, "(#{array}[#{idx}] == null ? nil : #{array}[#{idx}])") else s(:js_tmp, "#{array}[#{idx}]") end part = child.updated if SIMPLE_ASSIGNMENT .include?(child.type) part = part.updated(nil, part.children + [assign]) elsif child.type == :send part = part.updated(nil, part.children + [assign]) elsif child.type == :attrasgn part.last << assign elsif child.type == :mlhs helper :to_ary # nested destructuring tmp = scope.new_temp push ", (#{tmp} = $to_ary(#{assign.children[0]})" compile_masgn(child.children, tmp) push ')' scope.queue_temp(tmp) return else raise "Bad child node in masgn LHS: #{child}. LHS: #{lhs}" end push ', ' push expr(part) end
#compile_masgn(lhs_items, array, len = nil) ⇒ Object
'len' is how many rhs items are we sure we have
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# File 'opal/lib/opal/nodes/masgn.rb', line 33 def compile_masgn(lhs_items, array, len = nil) pre_splat = lhs_items.take_while { |child| child.type != :splat } post_splat = lhs_items.drop(pre_splat.size) pre_splat.each_with_index do |child, idx| compile_assignment(child, array, idx, len) end unless post_splat.empty? splat = post_splat.shift if post_splat.empty? # trailing splat if part = splat.children[0] helper :slice part = part.dup << s(:js_tmp, "$slice(#{array}, #{pre_splat.size})") push ', ' push expr(part) end else tmp = scope.new_temp # end index for items consumed by splat push ", #{tmp} = #{array}.length - #{post_splat.size}" push ", #{tmp} = (#{tmp} < #{pre_splat.size}) ? #{pre_splat.size} : #{tmp}" if part = splat.children[0] helper :slice part = part.dup << s(:js_tmp, "$slice(#{array}, #{pre_splat.size}, #{tmp})") push ', ' push expr(part) end post_splat.each_with_index do |child, idx| if idx == 0 compile_assignment(child, array, tmp) else compile_assignment(child, array, "#{tmp} + #{idx}") end end scope.queue_temp(tmp) end end end