Module: LexerKit::CLI::Commands::Visualize

Defined in:
lib/lexer_kit/cli/commands.rb

Overview

Visualize DFA as Graphviz DOT

Class Method Summary collapse

Class Method Details

.run(argv) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/lexer_kit/cli/commands.rb', line 335

def self.run(argv)
  options = { dfa: 0, output: nil }

  parser = OptionParser.new do |opts|
    opts.banner = "Usage: lexer_kit visualize [options] <file.lkt1|file.lkb1>"

    opts.on("--dfa INDEX", Integer, "DFA table index (default: 0)") do |v|
      options[:dfa] = v
    end

    opts.on("-o", "--output FILE", "Output file (default: stdout)") do |v|
      options[:output] = v
    end

    opts.on("-h", "--help", "Show this help") do
      puts opts
      puts
      puts "Examples:"
      puts "  lexer_kit visualize lexer.lkt1 | dot -Tpng -o dfa.png"
      puts "  lexer_kit visualize --dfa 1 lexer.lkt1 -o dfa.dot"
      return 0
    end
  end

  parser.parse!(argv)

  if argv.empty?
    warn "error: No input file specified"
    warn parser.banner
    return 1
  end

  path = argv.shift
  program = CLI.load_lexer(path)

  require "lexer_kit/debug"

  dfa = program.dfa_tables[options[:dfa]]
  raise ArgumentError, "DFA table #{options[:dfa]} not found" unless dfa

  dot = Debug::Visualizer.dfa_to_dot(dfa, program: program)

  if options[:output]
    File.write(options[:output], dot)
    warn "Written: #{options[:output]}"
  else
    puts dot
  end

  0
end