jsan/lib/index.js

handle circular references when stringifying and parsing

var cycle = require('./cycle');

exports.stringify = function stringify(value, replacer, space, _options) {

  if (arguments.length < 4) {
    try {
      if (arguments.length === 1) {
        return JSON.stringify(value);
      } else {
        return JSON.stringify.apply(JSON, arguments);
      }
    } catch (e) {}
  }

  var options = _options || false;
  if (typeof options === 'boolean') {
    options = {
      'date': options,
      'function': options,
      'regex': options,
      'undefined': options,
      'error': options,
      'symbol': options,
      'map': options,
      'set': options,
      'nan': options,
      'infinity': options
    }
  }

  var decycled = cycle.decycle(value, options, replacer);
  if (arguments.length === 1) {
    return JSON.stringify(decycled);
  } else {
    // decycle already handles when replacer is a function.
    return JSON.stringify(decycled, Array.isArray(replacer) ? replacer : null, space);
  }
}

exports.parse = function parse(text, reviver) {
  var needsRetrocycle = /"\$jsan"/.test(text);
  var parsed;
  if (arguments.length === 1) {
    parsed = JSON.parse(text);
  } else {
    parsed = JSON.parse(text, reviver);
  }
  if (needsRetrocycle) {
    parsed = cycle.retrocycle(parsed);
  }
  return parsed;
}