#!/usr/bin/env node

var path = require("path");
var fs = require("fs");
var acorn = require("../acorn.js");

var infile, infilecount = 0;
var options = {}, silent = false, compact = false;
var parsed;

function help(status) {
  // we want to print to stderr, not stdout, on errors.
  var print = (status == 0) ? console.out : console.err;
  print("usage: " + path.basename(process.argv[1]) + " [--ecma3|--ecma5] [--strictSemicolons]");
  print("        [--locations] [--compact] [--silent] [--help] [--] infile");
  process.exit(status);
}

for (var i = 2; i < process.argv.length; ++i) {
  var arg = process.argv[i];
  if (arg[0] != "-") {
    infile = arg;
    ++infilecount;
    continue;
  } else if (arg == "--") {
    if (i < process.argv.length - 2) help(1); // we have too many remaining `infile`s
    infile = process.argv[i + 1]; // we want the *next* argument, not the current one
    ++infilecount;
    break;
  }
  else if (arg == "--ecma3") options.ecmaVersion = 3;
  else if (arg == "--ecma5") options.ecmaVersion = 5;
  else if (arg == "--strictSemicolons") options.strictSemicolons = true;
  else if (arg == "--locations") options.locations = true;
  else if (arg == "--silent") silent = true;
  else if (arg == "--compact") compact = true;
  else if (arg == "--help") help(0);
  else help(1); // we already took care of all arguments without a starting dash
}

// test against counter: we want exactly 1 file. Any more or less should error.
if (infilecount !== 1) help(1);

try {
  var code = fs.readFileSync(infile, "utf8");
  parsed = acorn.parse(code, options);
} catch(e) {
  console.log(e.message);
  process.exit(1);
}

if (!silent)
  console.log(JSON.stringify(parsed, null, compact ? null : 2));