text: import {basename} from "path"
  import {readFileSync as readFile} from "fs"
  import * as acorn from "acorn"
  
  let infile, forceFile, silent = false, compact = false, tokenize = false
  const options = {}
  
  function help(status) {
    const print = (status == 0) ? console.log : console.error
    print("usage: " + basename(process.argv[1]) + " [--ecma3|--ecma5|--ecma6|--ecma7|...|--ecma2015|--ecma2016|...]")
    print("        [--tokenize] [--locations] [---allow-hash-bang] [--compact] [--silent] [--module] [--help] [--] [infile]")
    process.exit(status)
  }
  
  for (let i = 2; i < process.argv.length; ++i) {
    const arg = process.argv[i]
    if ((arg == "-" || arg[0] != "-") && !infile) infile = arg
    else if (arg == "--" && !infile && i + 2 == process.argv.length) forceFile = infile = process.argv[++i]
    else if (arg == "--locations") options.locations = true
    else if (arg == "--allow-hash-bang") options.allowHashBang = true
    else if (arg == "--silent") silent = true
    else if (arg == "--compact") compact = true
    else if (arg == "--help") help(0)
    else if (arg == "--tokenize") tokenize = true
    else if (arg == "--module") options.sourceType = 'module'
    else {
      let match = arg.match(/^--ecma(\d+)$/)
      if (match)
        options.ecmaVersion = +match[1]
      else
        help(1)
    }
  }
  
  function run(code) {
    let result
    if (!tokenize) {
      try { result = acorn.parse(code, options) }
      catch(e) { console.error(e.message); process.exit(1) }
    } else {
      result = []
      let tokenizer = acorn.tokenizer(code, options), token
      while (true) {
        try { token = tokenizer.getToken() }
        catch(e) { console.error(e.message); process.exit(1) }
        result.push(token)
        if (token.type == acorn.tokTypes.eof) break
      }
    }
    if (!silent) console.log(JSON.stringify(result, null, compact ? null : 2))
  }
  
  if (forceFile || infile && infile != "-") {
    run(readFile(infile, "utf8"))
  } else {
    let code = ""
    process.stdin.resume()
    process.stdin.on("data", chunk => code += chunk)
    process.stdin.on("end", () => run(code))
  }
  