Class: Opal::Nodes::ResBodyNode

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

#compile ⇒ Object 



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# File 'opal/lib/opal/nodes/rescue.rb', line 181

def compile
  push "if (Opal.rescue($err, ["
  if rescue_exprs.empty?
    # if no expressions are given, then catch StandardError only
    push expr(Sexp.new([:const, :StandardError]))
  else
    rescue_exprs.each_with_index do |rexpr, idx|
      push ', ' unless idx == 0
      push expr(rexpr)
    end
  end
  push "])) {"
  indent do
    if variable = rescue_variable
      variable[2] = s(:js_tmp, '$err')
      push expr(variable), ';'
    end

    # Need to ensure we clear the current exception out after the rescue block ends
    line "try {"
    indent do
      line process(rescue_body, @level)
    end
    line '} finally { Opal.pop_exception() }'
  end
  line "}"
end

#rescue_body ⇒ Object 



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# File 'opal/lib/opal/nodes/rescue.rb', line 223

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

#rescue_exprs ⇒ Object 



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# File 'opal/lib/opal/nodes/rescue.rb', line 217

def rescue_exprs
  exprs = args.dup
  exprs.pop if rescue_variable?(exprs.last)
  exprs.children
end

#rescue_variable ⇒ Object 



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# File 'opal/lib/opal/nodes/rescue.rb', line 213

def rescue_variable
  rescue_variable?(args.last) ? args.last.dup : nil
end

#rescue_variable?(variable) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'opal/lib/opal/nodes/rescue.rb', line 209

def rescue_variable?(variable)
  Sexp === variable and [:lasgn, :iasgn].include?(variable.type)
end