Module: LexerKit::CLI

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

Overview

Command-line interface for LexerKit

Defined Under Namespace

Modules: Commands

Constant Summary collapse

VERSION = 
LexerKit::VERSION

Class Method Summary collapse

Class Method Details

.load_lexer(path) ⇒ Object

Load lexer from .lkt1 or .lkb1 file



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# File 'lib/lexer_kit/cli.rb', line 82

def self.load_lexer(path)
  LexerKit.load_lexer(path)
end

.print_help ⇒ Object 



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# File 'lib/lexer_kit/cli.rb', line 53

def print_help
  puts <<~HELP
    Usage: lexer_kit <command> [options] [arguments]

    Commands:
      compile   Compile DSL file to .lkt1 or .lkb1
      lex       Tokenize input with a lexer
      info      Show lexer information
      disasm    Disassemble a .lkt1 or .lkb1 file
      visualize Output DFA as Graphviz DOT format

    Options:
      -h, --help     Show this help
      -v, --version  Show version

    Examples:
      lexer_kit compile json_lexer.rb
      lexer_kit compile json_lexer.rb --verbose  # show conflict warnings
      lexer_kit compile json_lexer.rb --dry-run  # check conflicts only
      lexer_kit lex json_lexer.lkt1 data.json
      lexer_kit info json_lexer.lkt1
      lexer_kit lex json_lexer.lkb1 data.json
      lexer_kit info json_lexer.lkb1
      lexer_kit visualize json_lexer.lkt1 | dot -Tpng -o dfa.png
  HELP
end

.render_error(error, color: $stderr.tty?) ⇒ Object 



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# File 'lib/lexer_kit/cli.rb', line 45

def render_error(error, color: $stderr.tty?)
  if error.respond_to?(:render)
    warn error.render(color: color)
  else
    warn "error: #{error.message}"
  end
end

.run(argv) ⇒ Object 



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# File 'lib/lexer_kit/cli.rb', line 12

def run(argv)
  if argv.empty? || argv[0] == "-h" || argv[0] == "--help"
    print_help
    return 0
  end

  if ["-v", "--version"].include?(argv[0])
    puts "lexer_kit #{VERSION}"
    return 0
  end

  command = argv.shift
  case command
  when "compile"
    Commands::Compile.run(argv)
  when "lex"
    Commands::Lex.run(argv)
  when "info"
    Commands::Info.run(argv)
  when "disasm"
    Commands::Disasm.run(argv)
  when "visualize"
    Commands::Visualize.run(argv)
  else
    warn "Unknown command: #{command}"
    warn "Run 'lexer_kit --help' for usage."
    1
  end
rescue StandardError => e
  render_error(e)
  1
end