Class: Opal::Nodes::RescueNode

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

Constant Summary

Constants included from Helpers

Helpers::BASIC_IDENTIFIER_RULES, Helpers::ES3_RESERVED_WORD_EXCLUSIVE, Helpers::ES51_RESERVED_WORD, Helpers::IMMUTABLE_PROPS, Helpers::PROTO_SPECIAL_METHODS, Helpers::PROTO_SPECIAL_PROPS, Helpers::RESERVED_FUNCTION_NAMES

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, #has_rescue_else?, #helper, #in_ensure, #in_ensure?, #in_while?, #initialize, #process, #push, #recv, #recv?, #s, #scope, #stmt, #stmt?, truthy_optimize?, #unshift, #while_loop, #with_temp, #wrap

Methods included from Helpers

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

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 162

def body_code
  body_code = (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 104

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

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

  push "try {"
  indent do
    line process(body_code, @level)
  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
      if child.type == :resbody
        has_rescue_handlers = true

        push " else " unless idx == 0
        line process(child, @level)
      end
    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 "return (function() {"
        indent do
          line compiler.process(compiler.returns(scope.rescue_else_sexp), @level)
        end
        line "})();"
      end
      line "}"
    end
    push "}"
  end

  # Wrap a try{} catch{} into a function
  # when it's an expression
  # or when there's a method call after begin;rescue;end
  wrap '(function() { ', '})()' if expr? or recv?
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 171

def handle_rescue_else_manually?
  !scope.in_ensure? && scope.has_rescue_else?
end