Class: N65::FrontEnd

Inherits:
Object
  • Object
show all
Defined in:
lib/n65/front_end.rb

Overview

This class handles the front end aspects, parsing the commandline options and running the assembler

Instance Method Summary collapse

Constructor Details

#initialize(argv) ⇒ FrontEnd

Returns a new instance of FrontEnd.



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# File 'lib/n65/front_end.rb', line 10

def initialize(argv)
  @options = { output_file: nil, write_symbol_table: false, quiet: false, cycle_count: false }
  @argv = argv.dup
end

Instance Method Details

#run ⇒ Object

Run the assembler



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# File 'lib/n65/front_end.rb', line 16

def run
  parser = create_option_parser
  parser.parse!(@argv)

  if @argv.size.zero?
    warn('No input files')
    exit(1)
  end

  # Only can assemble one file at once for now
  if @argv.size != 1
    warn('Can only assemble one input file at once, but you can use .inc and .incbin directives')
    exit(1)
  end

  input_file = @argv.shift

  # Make sure the input file exists
  unless File.exist?(input_file)
    warn("Input file #{input_file} does not exist")
    exit(1)
  end

  # Maybe they didn't provide an output file name, so we'll guess
  if @options[:output_file].nil?
    ext = File.extname(input_file)
    @options[:output_file] = "#{input_file.gsub(ext, '')}.nes"
  end

  if @options.values.any?(&:nil?)
    warn('Missing options try --help')
    exit(1)
  end

  N65::Assembler.from_file(input_file, @options)
end