Class: Basic101::Runtime

Inherits:
Object
  • Object
show all
Defined in:
lib/basic101/runtime.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(args = {}) ⇒ Runtime

Returns a new instance of Runtime.



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# File 'lib/basic101/runtime.rb', line 11

def initialize(args = {})
  @output = Output.new(args.fetch(:output_file, $stdout))
  @input = Input.new(@output, args.fetch(:input_file, $stdin))
  @program = args.fetch(:program, Program.new)
  @functions = Functions.new
  @for_stack = ForStack.new
  @random = Random.new(0)
  @transcript = NullTranscript.new
end

Instance Attribute Details

#for_stack ⇒ Object (readonly)

Returns the value of attribute for_stack.



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# File 'lib/basic101/runtime.rb', line 9

def for_stack
  @for_stack
end

#input ⇒ Object (readonly)

Returns the value of attribute input.



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# File 'lib/basic101/runtime.rb', line 7

def input
  @input
end

#output ⇒ Object (readonly)

Returns the value of attribute output.



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# File 'lib/basic101/runtime.rb', line 8

def output
  @output
end

Instance Method Details

#add_function(function) ⇒ Object 



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# File 'lib/basic101/runtime.rb', line 96

def add_function(function)
  @functions.add_function(function)
end

#call_function(identifier, argument_values) ⇒ Object 



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# File 'lib/basic101/runtime.rb', line 92

def call_function(identifier, argument_values)
  @functions.call(self, identifier, argument_values)
end

#end_program ⇒ Object 



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# File 'lib/basic101/runtime.rb', line 55

def end_program
  @program_counter.goto_end
end

#function_exists?(identifier) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/basic101/runtime.rb', line 88

def function_exists?(identifier)
  @functions.has_function?(identifier)
end

#get_array(identifier, num_dimensions) ⇒ Object 



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# File 'lib/basic101/runtime.rb', line 108

def get_array(identifier, num_dimensions) 
  @arrays[identifier.to_s] ||=
    BasicArray.new(num_dimensions, identifier.default)
end

#get_data_item ⇒ Object

Raises:



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# File 'lib/basic101/runtime.rb', line 113

def get_data_item
  data_item = @data_items.shift
  raise OutOfDataError unless data_item
  data_item
end

#get_scalar(identifier) ⇒ Object 



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# File 'lib/basic101/runtime.rb', line 100

def get_scalar(identifier)
  @scalars[identifier.to_s] ||= BasicInteger.new(0)
end

#gosub_line(line_number) ⇒ Object 



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# File 'lib/basic101/runtime.rb', line 39

def gosub_line(line_number)
  @program_counter.gosub_line(line_number)
end

#goto_index(index) ⇒ Object 



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# File 'lib/basic101/runtime.rb', line 47

def goto_index(index)
  @program_counter.goto_index(index)
end

#goto_index_after(index) ⇒ Object 



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# File 'lib/basic101/runtime.rb', line 51

def goto_index_after(index)
  @program_counter.goto_index_after(index)
end

#goto_line(line_number) ⇒ Object 



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# File 'lib/basic101/runtime.rb', line 35

def goto_line(line_number)
  @program_counter.goto_line(line_number)
end

#rand ⇒ Object 



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# File 'lib/basic101/runtime.rb', line 31

def rand
  @random.rand
end

#randomize ⇒ Object 



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# File 'lib/basic101/runtime.rb', line 27

def randomize
  @random = Random.new
end

#restore(line_number = nil) ⇒ Object 



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# File 'lib/basic101/runtime.rb', line 119

def restore(line_number = nil)
  @data_items = @program.data_items(line_number)
end

#return ⇒ Object 



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# File 'lib/basic101/runtime.rb', line 43

def return
  @program_counter.return
end

#run ⇒ Object 



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# File 'lib/basic101/runtime.rb', line 59

def run
  transcribe_errors do
    reset
    begin
      while !@program_counter.end?
        statement = @program_counter.current_statement
        begin
          @program_counter.goto_next_statement
          statement.execute(self)
        rescue StandardError => e
          statement.raise_error_with_line_number(e)
        end
      end
    end
  end
end

#set_scalar(identifier, value) ⇒ Object 



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# File 'lib/basic101/runtime.rb', line 104

def set_scalar(identifier, value)
  @scalars[identifier.to_s] = value
end

#transcribe_errors ⇒ Object 



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# File 'lib/basic101/runtime.rb', line 76

def transcribe_errors
  begin
    yield
  rescue Parslet::ParseFailed => e
    @transcript.save_output_lines e
    raise
  rescue Basic101::Error => e
    @transcript.save_output_lines e
    raise
  end
end

#transcript=(transcript) ⇒ Object 



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# File 'lib/basic101/runtime.rb', line 21

def transcript=(transcript)
  @transcript = transcript
  @output.transcript = @transcript
  @input.transcript = @transcript
end