Class: Opal::Rewriters::LogicalOperatorAssignment::ConditionalSendHandler

Inherits:

Opal::Rewriters::LogicalOperatorAssignment

Object
Parser::AST::Processor
Base
Opal::Rewriters::LogicalOperatorAssignment
Opal::Rewriters::LogicalOperatorAssignment::ConditionalSendHandler

Defined in:: opal/lib/opal/rewriters/logical_operator_assignment.rb

Overview

Takes recvr&.meth ||= rhs Produces recvr.nil? ? nil : recvr.meth ||= rhs NOTE: Later output of this handler gets post-processed by this rewriter again using SendHandler to recvr.nil? ? nil : (recvr.meth || recvr.meth = rhs)

Constant Summary

Constants inherited from Opal::Rewriters::LogicalOperatorAssignment

ASSIGNMENT_STRING_NODE , ClassVariableHandler , ConstantHandler , GET_SET , GlobalVariableHandler , HANDLERS , InstanceVariableHandler , LocalVariableHandler

Constants inherited from Base

Base::DUMMY_LOCATION

Instance Attribute Summary

Attributes inherited from Base

#current_node

Class Method Summary collapse

.call(lhs, rhs, root_type) ⇒ Object

Methods inherited from Opal::Rewriters::LogicalOperatorAssignment

new_temp , #on_and_asgn , #on_defined? , #on_or_asgn , reset_tmp_counter!

Methods inherited from Base

#append_to_body , #begin_with_stmts , #dynamic! , #error , #on_top , #prepend_to_body , #process , s , #s , #stmts_of

Class Method Details

.call(lhs, rhs, root_type) ⇒ `Object`

# File 'opal/lib/opal/rewriters/logical_operator_assignment.rb', line 94
def self.call(lhs, rhs, root_type)
 root_type = :"#{root_type}_asgn"
 recvr, meth, *args = *lhs
 recvr_tmp = new_temp
 cache_recvr = s(:lvasgn, recvr_tmp, recvr) # $tmp = recvr
 recvr = s(:js_tmp, recvr_tmp)
 recvr_is_nil = s(:send, recvr, :nil?) # recvr.nil?
 plain_send = lhs.updated(:send, [recvr, meth, *args]) # recvr.meth
 plain_or_asgn = s(root_type, plain_send, rhs) # recvr.meth ||= rhs

 s(:begin,
 cache_recvr,
 s(:if, recvr_is_nil, # if recvr.nil?
 s(:nil), # nil
 # else
 plain_or_asgn # recvr.meth ||= rhs
 ),
 ) # end
end