Class: Binding

Inherits:
Object show all
Defined in:
opal/opal/corelib/binding.rb,
opal/opal/corelib/irb.rb

Overview

backtick_javascript: true

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(jseval, scope_variables = [], receiver = undefined, source_location = nil) ⇒ Binding

Returns a new instance of Binding.



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# File 'opal/opal/corelib/binding.rb', line 5

def initialize(jseval, scope_variables = [], receiver = undefined, source_location = nil)
  @jseval, @scope_variables, @receiver, @source_location = \
    jseval, scope_variables, receiver, source_location

  receiver = js_eval('self') if `typeof receiver === "undefined"`
end

Instance Attribute Details

#receiver ⇒ Object (readonly)

Returns the value of attribute receiver.



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# File 'opal/opal/corelib/binding.rb', line 47

def receiver
  @receiver
end

#source_location ⇒ Object (readonly)

Returns the value of attribute source_location.



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# File 'opal/opal/corelib/binding.rb', line 47

def source_location
  @source_location
end

Instance Method Details

#eval(str, file = nil, line = nil) ⇒ Object 



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# File 'opal/opal/corelib/binding.rb', line 41

def eval(str, file = nil, line = nil)
  return receiver if str == 'self'

  ::Kernel.eval(str, self, file, line)
end

#irb ⇒ Object 



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# File 'opal/opal/corelib/irb.rb', line 110

def irb
  ::Opal::IRB.ensure_loaded('opal-replutils')

  silencer = ::Opal::IRB::Silencer.new

  ::Opal::IRB.prepare_console do
    loop do
      print '>> '
      line = gets
      break unless line
      code = ''

      puts line if ::Opal::IRB.browser?

      if line.start_with? 'ls '
        code = line[3..-1]
        mode = :ls
      elsif line == "ls\n"
        code = 'self'
        mode = :ls
      elsif line.start_with? 'show '
        code = line[5..-1]
        mode = :show
      else
        code = line
        mode = :inspect
      end

      js_code = nil

      begin
        silencer.silence do
          js_code = `Opal.compile(code, {irb: true})`
        end
      rescue SyntaxError => e
        if ::Opal::IRB::LINEBREAKS.include?(e.message)
          print '.. '
          line = gets
          return unless line
          puts line if ::Opal::IRB.browser?
          code += line
          retry
        elsif silencer.warnings.empty?
          warn e.full_message
        else
          # Most likely a parser error
          warn silencer.warnings
        end
      end

      if mode == :show
        puts js_code
        return
      end

      puts ::REPLUtils.eval_and_print(js_code, mode, false, self)
    end
  end
end

#js_eval(*args) ⇒ Object 



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# File 'opal/opal/corelib/binding.rb', line 12

def js_eval(*args)
  if @jseval
    @jseval.call(*args)
  else
    ::Kernel.raise 'Evaluation on a Proc#binding is not supported'
  end
end

#local_variable_defined?(value) ⇒ Boolean

Returns:



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# File 'opal/opal/corelib/binding.rb', line 37

def local_variable_defined?(value)
  @scope_variables.include?(value)
end

#local_variable_get(symbol) ⇒ Object 



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# File 'opal/opal/corelib/binding.rb', line 20

def local_variable_get(symbol)
  js_eval(symbol)
rescue ::Exception
  ::Kernel.raise ::NameError, "local variable `#{symbol}' is not defined for #{inspect}"
end

#local_variable_set(symbol, value) ⇒ Object 



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# File 'opal/opal/corelib/binding.rb', line 26

def local_variable_set(symbol, value)
  `Opal.Binding.tmp_value = value`
  js_eval("#{symbol} = Opal.Binding.tmp_value")
  `delete Opal.Binding.tmp_value`
  value
end

#local_variables ⇒ Object 



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# File 'opal/opal/corelib/binding.rb', line 33

def local_variables
  @scope_variables
end