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, #type

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_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

#conditional_send, #current_indent, #empty_line, #indent, #js_falsy, #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_codeObject


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# File 'opal/lib/opal/nodes/rescue.rb', line 136

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

#compileObject


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# File 'opal/lib/opal/nodes/rescue.rb', line 83

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

  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

  # 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? || 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 151

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

#rescue_else_codeObject


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# File 'opal/lib/opal/nodes/rescue.rb', line 142

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