Class: Opal::Nodes::RescueNode

Inherits:
Base
  • Object
show all
Defined in:
opal/lib/opal/nodes/rescue.rb

Instance Attribute Summary

Attributes inherited from Base

#compiler, #sexp, #type

Attributes included from Closure::NodeSupport

#closure

Instance Method Summary collapse

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

#body_code ⇒ Object 



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# File 'opal/lib/opal/nodes/rescue.rb', line 171

def body_code
  body_code = (body.nil? || body.type == :resbody ? s(:nil) : body)
  body_code = compiler.returns(body_code) unless stmt?
  body_code
end

#compile ⇒ Object 



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# File 'opal/lib/opal/nodes/rescue.rb', line 97

def compile
  scope.rescue_else_sexp = children[1..-1].detect { |sexp| sexp && sexp.type != :resbody }
  _has_rescue_handlers = false

  if handle_rescue_else_manually?
    line 'var $no_errors = true;'
  end

  closure_type = Closure::NONE
  closure_type |= Closure::JS_FUNCTION if expr? || recv?
  if has_retry?
    closure_type |= Closure::JS_LOOP        \
                 |  Closure::JS_LOOP_INSIDE \
                 |  Closure::RESCUE_RETRIER
  end
  push_closure(closure_type) if closure_type != Closure::NONE

  in_rescue(self) do
    push 'try {'
    indent do
      line stmt(body_code)
    end
    line '} catch ($err) {'

    indent do
      if has_rescue_else?
        line '$no_errors = false;'
      end

      children[1..-1].each_with_index do |child, idx|
        # counting only rescue, ignoring rescue-else statement
        next unless child && child.type == :resbody
        _has_rescue_handlers = true

        push ' else ' unless idx == 0
        line process(child, @level)
      end

      # if no resbodys capture our error, then rethrow
      push ' else { throw $err; }'
    end

    line '}'

    if handle_rescue_else_manually?
      # here we must add 'finally' explicitly
      push 'finally {'
      indent do
        line 'if ($no_errors) { '
        indent do
          line stmt(rescue_else_code)
        end
        line '}'
      end
      push '}'
    end
  end

  pop_closure if closure_type != Closure::NONE

  wrap 'do { ', ' break; } while(1)' if has_retry?

  # Wrap a try{} catch{} into a function
  # when it's an expression
  # or when there's a method call after begin;rescue;end
  if expr? || recv?
    if scope.await_encountered
      wrap '(await (async function() { ', '})())'
    else
      wrap '(function() { ', '})()'
    end
  end
end

#handle_rescue_else_manually? ⇒ Boolean

Returns true when there's no 'ensure' statement wrapping current rescue.

Returns:

  • (Boolean) 


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# File 'opal/lib/opal/nodes/rescue.rb', line 186

def handle_rescue_else_manually?
  !in_ensure? && has_rescue_else?
end

#has_retry? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'opal/lib/opal/nodes/rescue.rb', line 190

def has_retry?
  @sexp.meta[:has_retry]
end

#rescue_else_code ⇒ Object 



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# File 'opal/lib/opal/nodes/rescue.rb', line 177

def rescue_else_code
  rescue_else_code = scope.rescue_else_sexp
  rescue_else_code = compiler.returns(rescue_else_code) unless stmt?
  rescue_else_code
end