Class: Opal::Nodes::EnsureNode

Inherits:
Base
  • Object
show all
Defined in:
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_sexpObject


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# File 'lib/opal/nodes/rescue.rb', line 55

def body_sexp
  if wrap_in_closure?
    compiler.returns(begn)
  else
    begn
  end
end

#compileObject


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# File 'lib/opal/nodes/rescue.rb', line 12

def compile
  push 'try {'

  in_ensure do
    line stmt(body_sexp)
  end

  line '} finally {'

  indent do
    if has_rescue_else?
      # $no_errors indicates thate there were no error raised
      unshift 'var $no_errors = true; '

      # when there's a begin;rescue;else;ensure;end statement,
      # ruby returns a result of the 'else' branch
      # but invokes it before 'ensure'.
      # so, here we
      # 1. save the result of calling else to $rescue_else_result
      # 2. call ensure
      # 2. return $rescue_else_result
      line 'var $rescue_else_result;'
      line 'if ($no_errors) { '
      indent do
        line '$rescue_else_result = (function() {'
        indent do
          line stmt(rescue_else_code)
        end
        line '})();'
      end
      line '}'
      line compiler.process(ensr_sexp, @level)
      line 'if ($no_errors) { return $rescue_else_result; }'
    else
      line compiler.process(ensr_sexp, @level)
    end
  end

  line '}'

  wrap '(function() { ', '; })()' if wrap_in_closure?
end

#ensr_sexpObject


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# File 'lib/opal/nodes/rescue.rb', line 63

def ensr_sexp
  ensr || s(:nil)
end

#rescue_else_codeObject


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# File 'lib/opal/nodes/rescue.rb', line 71

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

#wrap_in_closure?Boolean

Returns:

  • (Boolean)

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# File 'lib/opal/nodes/rescue.rb', line 67

def wrap_in_closure?
  recv? || expr? || has_rescue_else?
end