ES3 Inspect tool

example.js

// to depth-first inspect all attributes of an object
inspect(obj)

// or, to see all attributes on the entire prototype chain
inspect.chain(obj)

inspect.js

var inspect = function () {
  "use strict";

  var _getPrototypeOf = Object.getPrototypeOf || _fallback_getPrototypeOf;
  var _hasOwnProperty = {}.hasOwnProperty;
  var _isArray = Array.isArray || _fallback_isArray;

  inspect.chain = function (obj, cb) {
    return inspect(prototypeChain(obj), cb);
  };
  return inspect;

  function _fallback_getPrototypeOf(obj) {
    console.log('fallback getPrototypeOf');
    return obj.__proto__;
  }

  function _fallback_isArray(obj) {
    return 'number' == typeof obj.length && 'function' == typeof obj.map && 'function' == typeof obj.forEach;
  }

  function prototypeChain(obj) {
    var res = [];
    while (null !== obj && undefined !== obj) {
      res.push(obj);
      obj = _getPrototypeOf(obj);
    }
    return res;
  }

  function _indent_path(path, indent) {
    var i = 0,
        len = path.length - 1,
        res = '';
    for (; i < len; i++) {
      res += indent || '    ';
    }
    return res + (path[len] || '');
  }

  function _cb_debug(kind, path, v, type) {
    var sz_path = _indent_path(path, '    ');

    if ('value' === kind) {
      console.log(sz_path + '(' + type + '):', [v]);
    } else if ('array' === kind) {
      console.log(sz_path + '(' + type + '): @[]');
    } else if ('hash' === kind) {
      console.log(sz_path + '(' + type + '): @{}');
    }
  }

  function inspect(obj, cb) {
    if (null == cb) {
      cb = _cb_debug;
    }

    var seen = [];
    var q = [[obj, []]];

    while (q.length) {
      visit_tip(q.shift());
    }

    function visit_tip(tip) {
      var v = tip[0],
          path = tip[1],
          type = typeof v;
      var k = path.join('.');
      if (-1 !== seen.indexOf(v)) {
        return;
      }
      seen.push(v);

      if (null === v || undefined === v) {
        cb('value', path, v, type);
      } else if ('object' == type) {
        if (_isArray(v)) {
          cb('array', path, v, type);
          visit_array(v, path);
        } else {
          cb('hash', path, v, type);
          visit_hash(v, path);
        }
      } else cb('value', path, v, type);
    }

    function visit_hash(obj, path) {
      var ql = [],
          k;
      for (k in obj) {
        if (_hasOwnProperty.call(obj, k)) {
          ql.push([obj[k], path.concat([k])]);
        }
      }
      q = ql.concat(q);
    }

    function visit_array(arr, path) {
      var ql = [],
          i = 0,
          len = arr.length;
      for (; i < len; i++) {
        ql.push([arr[i], path.concat(['[' + i + ']'])]);
      }
      q = ql.concat(q);
    }
  }
}();

inspect.jsy

var inspect = (function() {
  "use strict"

  var _getPrototypeOf = Object.getPrototypeOf || _fallback_getPrototypeOf
  var _hasOwnProperty = {}.hasOwnProperty
  var _isArray = Array.isArray || _fallback_isArray

  inspect.chain = function(obj, cb) { return inspect(prototypeChain(obj), cb) }
  return inspect

  function _fallback_getPrototypeOf(obj) ::
    console.log @ 'fallback getPrototypeOf'
    return obj.__proto__

  function _fallback_isArray(obj) ::
    return 'number' == typeof obj.length &&
      'function' == typeof obj.map &&
      'function' == typeof obj.forEach

  function prototypeChain(obj) ::
    var res = []
    while null !== obj && undefined !== obj ::
      res.push @ obj
      obj = _getPrototypeOf(obj)
    return res
      

  function _indent_path(path, indent) ::
    var i=0, len=path.length-1, res=''
    for ; i<len; i++ :: res += (indent || '    ')
    return res + (path[len] || '')

  function _cb_debug(kind, path, v, type) ::
    var sz_path = _indent_path(path, '    ')

    if 'value' === kind ::
      console.log @ sz_path+'('+type+'):', [v]
    else if 'array' === kind ::
      console.log @ sz_path+'('+type+'): @[]'
    else if 'hash' === kind ::
      console.log @ sz_path+'('+type+'): @{}'


  function inspect(obj, cb) ::
    if null == cb :: cb = _cb_debug

    var seen = []
    var q = [[obj, []]]

    while q.length ::
      visit_tip @ q.shift()

    function visit_tip(tip) ::
      var v = tip[0], path=tip[1], type = typeof v
      var k = path.join('.')
      if -1 !== seen.indexOf(v) :: return
      seen.push(v)

      if null === v || undefined === v ::
        cb @ 'value', path, v, type
      else if 'object' == type ::
        if _isArray(v) ::
          cb @ 'array', path, v, type
          visit_array(v, path)
        else ::
          cb @ 'hash', path, v, type
          visit_hash(v, path)
      else cb @ 'value', path, v, type


    function visit_hash(obj, path) ::
      var ql=[], k
      for k in obj ::
        if _hasOwnProperty.call(obj, k) ::
          ql.push @# obj[k], path.concat([k])
      q = ql.concat @ q

    function visit_array(arr, path) ::
      var ql=[], i=0, len = arr.length
      for ; i<len; i++ ::
        ql.push @# arr[i], path.concat(['['+i+']'])
      q = ql.concat @ q
})()

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