Class: Opal::Nodes::EnsureNode

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_sexp ⇒ Object

[View source]

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# File 'opal/lib/opal/nodes/rescue.rb', line 79

def body_sexp
  if wrap_in_closure?
    sexp = compiler.returns(begn)
    # 'rescue' is an edge case that should be compiled to
    # try { return function(){ ..rescue through try/catch.. }() }
    sexp.type == :rescue ? s(:js_return, sexp) : sexp
  else
    sexp = begn
  end
end

#compile ⇒ Object

[View source]

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# File 'opal/lib/opal/nodes/rescue.rb', line 36

def compile
  push "try {"

  in_ensure do
    line compiler.process(body_sexp, @level)
  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 "$rescue_else_result = (function() {"
        indent do
          line compiler.process(compiler.returns(scope.rescue_else_sexp), @level)
        end
        line "})();"
      end
      line "}"
      line compiler.process(ensr_sexp, @level)
      line "if ($no_errors) { return $rescue_else_result; }"
    else
      line compiler.process(ensr_sexp, @level)
    end
  end

  line "}"

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

#ensr_sexp ⇒ Object

[View source]

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# File 'opal/lib/opal/nodes/rescue.rb', line 90

def ensr_sexp
  ensr || s(:nil)
end

#wrap_in_closure? ⇒ Boolean

Returns:

  • (Boolean)
[View source]

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# File 'opal/lib/opal/nodes/rescue.rb', line 94

def wrap_in_closure?
  recv? or expr? or has_rescue_else?
end