react-xml-viewer/dist/index.es.js

Simple and configurable React component to prettify XMLs. >

import stream from 'stream';
import string_decoder from 'string_decoder';
import React from 'react';
import PropTypes from 'prop-types';

function createCommonjsModule(fn, module) {
	return module = { exports: {} }, fn(module, module.exports), module.exports;
}

var sax = createCommonjsModule(function (module, exports) {
(function (sax) { // wrapper for non-node envs
  sax.parser = function (strict, opt) { return new SAXParser(strict, opt) };
  sax.SAXParser = SAXParser;
  sax.SAXStream = SAXStream;
  sax.createStream = createStream;

  // When we pass the MAX_BUFFER_LENGTH position, start checking for buffer overruns.
  // When we check, schedule the next check for MAX_BUFFER_LENGTH - (max(buffer lengths)),
  // since that's the earliest that a buffer overrun could occur.  This way, checks are
  // as rare as required, but as often as necessary to ensure never crossing this bound.
  // Furthermore, buffers are only tested at most once per write(), so passing a very
  // large string into write() might have undesirable effects, but this is manageable by
  // the caller, so it is assumed to be safe.  Thus, a call to write() may, in the extreme
  // edge case, result in creating at most one complete copy of the string passed in.
  // Set to Infinity to have unlimited buffers.
  sax.MAX_BUFFER_LENGTH = 64 * 1024;

  var buffers = [
    'comment', 'sgmlDecl', 'textNode', 'tagName', 'doctype',
    'procInstName', 'procInstBody', 'entity', 'attribName',
    'attribValue', 'cdata', 'script'
  ];

  sax.EVENTS = [
    'text',
    'processinginstruction',
    'sgmldeclaration',
    'doctype',
    'comment',
    'opentagstart',
    'attribute',
    'opentag',
    'closetag',
    'opencdata',
    'cdata',
    'closecdata',
    'error',
    'end',
    'ready',
    'script',
    'opennamespace',
    'closenamespace'
  ];

  function SAXParser (strict, opt) {
    if (!(this instanceof SAXParser)) {
      return new SAXParser(strict, opt)
    }

    var parser = this;
    clearBuffers(parser);
    parser.q = parser.c = '';
    parser.bufferCheckPosition = sax.MAX_BUFFER_LENGTH;
    parser.opt = opt || {};
    parser.opt.lowercase = parser.opt.lowercase || parser.opt.lowercasetags;
    parser.looseCase = parser.opt.lowercase ? 'toLowerCase' : 'toUpperCase';
    parser.tags = [];
    parser.closed = parser.closedRoot = parser.sawRoot = false;
    parser.tag = parser.error = null;
    parser.strict = !!strict;
    parser.noscript = !!(strict || parser.opt.noscript);
    parser.state = S.BEGIN;
    parser.strictEntities = parser.opt.strictEntities;
    parser.ENTITIES = parser.strictEntities ? Object.create(sax.XML_ENTITIES) : Object.create(sax.ENTITIES);
    parser.attribList = [];

    // namespaces form a prototype chain.
    // it always points at the current tag,
    // which protos to its parent tag.
    if (parser.opt.xmlns) {
      parser.ns = Object.create(rootNS);
    }

    // mostly just for error reporting
    parser.trackPosition = parser.opt.position !== false;
    if (parser.trackPosition) {
      parser.position = parser.line = parser.column = 0;
    }
    emit(parser, 'onready');
  }

  if (!Object.create) {
    Object.create = function (o) {
      function F () {}
      F.prototype = o;
      var newf = new F();
      return newf
    };
  }

  if (!Object.keys) {
    Object.keys = function (o) {
      var a = [];
      for (var i in o) if (o.hasOwnProperty(i)) a.push(i);
      return a
    };
  }

  function checkBufferLength (parser) {
    var maxAllowed = Math.max(sax.MAX_BUFFER_LENGTH, 10);
    var maxActual = 0;
    for (var i = 0, l = buffers.length; i < l; i++) {
      var len = parser[buffers[i]].length;
      if (len > maxAllowed) {
        // Text/cdata nodes can get big, and since they're buffered,
        // we can get here under normal conditions.
        // Avoid issues by emitting the text node now,
        // so at least it won't get any bigger.
        switch (buffers[i]) {
          case 'textNode':
            closeText(parser);
            break

          case 'cdata':
            emitNode(parser, 'oncdata', parser.cdata);
            parser.cdata = '';
            break

          case 'script':
            emitNode(parser, 'onscript', parser.script);
            parser.script = '';
            break

          default:
            error(parser, 'Max buffer length exceeded: ' + buffers[i]);
        }
      }
      maxActual = Math.max(maxActual, len);
    }
    // schedule the next check for the earliest possible buffer overrun.
    var m = sax.MAX_BUFFER_LENGTH - maxActual;
    parser.bufferCheckPosition = m + parser.position;
  }

  function clearBuffers (parser) {
    for (var i = 0, l = buffers.length; i < l; i++) {
      parser[buffers[i]] = '';
    }
  }

  function flushBuffers (parser) {
    closeText(parser);
    if (parser.cdata !== '') {
      emitNode(parser, 'oncdata', parser.cdata);
      parser.cdata = '';
    }
    if (parser.script !== '') {
      emitNode(parser, 'onscript', parser.script);
      parser.script = '';
    }
  }

  SAXParser.prototype = {
    end: function () { end(this); },
    write: write,
    resume: function () { this.error = null; return this },
    close: function () { return this.write(null) },
    flush: function () { flushBuffers(this); }
  };

  var Stream;
  try {
    Stream = stream.Stream;
  } catch (ex) {
    Stream = function () {};
  }

  var streamWraps = sax.EVENTS.filter(function (ev) {
    return ev !== 'error' && ev !== 'end'
  });

  function createStream (strict, opt) {
    return new SAXStream(strict, opt)
  }

  function SAXStream (strict, opt) {
    if (!(this instanceof SAXStream)) {
      return new SAXStream(strict, opt)
    }

    Stream.apply(this);

    this._parser = new SAXParser(strict, opt);
    this.writable = true;
    this.readable = true;

    var me = this;

    this._parser.onend = function () {
      me.emit('end');
    };

    this._parser.onerror = function (er) {
      me.emit('error', er);

      // if didn't throw, then means error was handled.
      // go ahead and clear error, so we can write again.
      me._parser.error = null;
    };

    this._decoder = null;

    streamWraps.forEach(function (ev) {
      Object.defineProperty(me, 'on' + ev, {
        get: function () {
          return me._parser['on' + ev]
        },
        set: function (h) {
          if (!h) {
            me.removeAllListeners(ev);
            me._parser['on' + ev] = h;
            return h
          }
          me.on(ev, h);
        },
        enumerable: true,
        configurable: false
      });
    });
  }

  SAXStream.prototype = Object.create(Stream.prototype, {
    constructor: {
      value: SAXStream
    }
  });

  SAXStream.prototype.write = function (data) {
    if (typeof Buffer === 'function' &&
      typeof Buffer.isBuffer === 'function' &&
      Buffer.isBuffer(data)) {
      if (!this._decoder) {
        var SD = string_decoder.StringDecoder;
        this._decoder = new SD('utf8');
      }
      data = this._decoder.write(data);
    }

    this._parser.write(data.toString());
    this.emit('data', data);
    return true
  };

  SAXStream.prototype.end = function (chunk) {
    if (chunk && chunk.length) {
      this.write(chunk);
    }
    this._parser.end();
    return true
  };

  SAXStream.prototype.on = function (ev, handler) {
    var me = this;
    if (!me._parser['on' + ev] && streamWraps.indexOf(ev) !== -1) {
      me._parser['on' + ev] = function () {
        var args = arguments.length === 1 ? [arguments[0]] : Array.apply(null, arguments);
        args.splice(0, 0, ev);
        me.emit.apply(me, args);
      };
    }

    return Stream.prototype.on.call(me, ev, handler)
  };

  // this really needs to be replaced with character classes.
  // XML allows all manner of ridiculous numbers and digits.
  var CDATA = '[CDATA[';
  var DOCTYPE = 'DOCTYPE';
  var XML_NAMESPACE = 'http://www.w3.org/XML/1998/namespace';
  var XMLNS_NAMESPACE = 'http://www.w3.org/2000/xmlns/';
  var rootNS = { xml: XML_NAMESPACE, xmlns: XMLNS_NAMESPACE };

  // http://www.w3.org/TR/REC-xml/#NT-NameStartChar
  // This implementation works on strings, a single character at a time
  // as such, it cannot ever support astral-plane characters (10000-EFFFF)
  // without a significant breaking change to either this  parser, or the
  // JavaScript language.  Implementation of an emoji-capable xml parser
  // is left as an exercise for the reader.
  var nameStart = /[:_A-Za-z\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02FF\u0370-\u037D\u037F-\u1FFF\u200C-\u200D\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD]/;

  var nameBody = /[:_A-Za-z\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02FF\u0370-\u037D\u037F-\u1FFF\u200C-\u200D\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD\u00B7\u0300-\u036F\u203F-\u2040.\d-]/;

  var entityStart = /[#:_A-Za-z\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02FF\u0370-\u037D\u037F-\u1FFF\u200C-\u200D\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD]/;
  var entityBody = /[#:_A-Za-z\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02FF\u0370-\u037D\u037F-\u1FFF\u200C-\u200D\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD\u00B7\u0300-\u036F\u203F-\u2040.\d-]/;

  function isWhitespace (c) {
    return c === ' ' || c === '\n' || c === '\r' || c === '\t'
  }

  function isQuote (c) {
    return c === '"' || c === '\''
  }

  function isAttribEnd (c) {
    return c === '>' || isWhitespace(c)
  }

  function isMatch (regex, c) {
    return regex.test(c)
  }

  function notMatch (regex, c) {
    return !isMatch(regex, c)
  }

  var S = 0;
  sax.STATE = {
    BEGIN: S++, // leading byte order mark or whitespace
    BEGIN_WHITESPACE: S++, // leading whitespace
    TEXT: S++, // general stuff
    TEXT_ENTITY: S++, // &amp and such.
    OPEN_WAKA: S++, // <
    SGML_DECL: S++, // <!BLARG
    SGML_DECL_QUOTED: S++, // <!BLARG foo "bar
    DOCTYPE: S++, // <!DOCTYPE
    DOCTYPE_QUOTED: S++, // <!DOCTYPE "//blah
    DOCTYPE_DTD: S++, // <!DOCTYPE "//blah" [ ...
    DOCTYPE_DTD_QUOTED: S++, // <!DOCTYPE "//blah" [ "foo
    COMMENT_STARTING: S++, // <!-
    COMMENT: S++, // <!--
    COMMENT_ENDING: S++, // <!-- blah -
    COMMENT_ENDED: S++, // <!-- blah --
    CDATA: S++, // <![CDATA[ something
    CDATA_ENDING: S++, // ]
    CDATA_ENDING_2: S++, // ]]
    PROC_INST: S++, // <?hi
    PROC_INST_BODY: S++, // <?hi there
    PROC_INST_ENDING: S++, // <?hi "there" ?
    OPEN_TAG: S++, // <strong
    OPEN_TAG_SLASH: S++, // <strong /
    ATTRIB: S++, // <a
    ATTRIB_NAME: S++, // <a foo
    ATTRIB_NAME_SAW_WHITE: S++, // <a foo _
    ATTRIB_VALUE: S++, // <a foo=
    ATTRIB_VALUE_QUOTED: S++, // <a foo="bar
    ATTRIB_VALUE_CLOSED: S++, // <a foo="bar"
    ATTRIB_VALUE_UNQUOTED: S++, // <a foo=bar
    ATTRIB_VALUE_ENTITY_Q: S++, // <foo bar="&quot;"
    ATTRIB_VALUE_ENTITY_U: S++, // <foo bar=&quot
    CLOSE_TAG: S++, // </a
    CLOSE_TAG_SAW_WHITE: S++, // </a   >
    SCRIPT: S++, // <script> ...
    SCRIPT_ENDING: S++ // <script> ... <
  };

  sax.XML_ENTITIES = {
    'amp': '&',
    'gt': '>',
    'lt': '<',
    'quot': '"',
    'apos': "'"
  };

  sax.ENTITIES = {
    'amp': '&',
    'gt': '>',
    'lt': '<',
    'quot': '"',
    'apos': "'",
    'AElig': 198,
    'Aacute': 193,
    'Acirc': 194,
    'Agrave': 192,
    'Aring': 197,
    'Atilde': 195,
    'Auml': 196,
    'Ccedil': 199,
    'ETH': 208,
    'Eacute': 201,
    'Ecirc': 202,
    'Egrave': 200,
    'Euml': 203,
    'Iacute': 205,
    'Icirc': 206,
    'Igrave': 204,
    'Iuml': 207,
    'Ntilde': 209,
    'Oacute': 211,
    'Ocirc': 212,
    'Ograve': 210,
    'Oslash': 216,
    'Otilde': 213,
    'Ouml': 214,
    'THORN': 222,
    'Uacute': 218,
    'Ucirc': 219,
    'Ugrave': 217,
    'Uuml': 220,
    'Yacute': 221,
    'aacute': 225,
    'acirc': 226,
    'aelig': 230,
    'agrave': 224,
    'aring': 229,
    'atilde': 227,
    'auml': 228,
    'ccedil': 231,
    'eacute': 233,
    'ecirc': 234,
    'egrave': 232,
    'eth': 240,
    'euml': 235,
    'iacute': 237,
    'icirc': 238,
    'igrave': 236,
    'iuml': 239,
    'ntilde': 241,
    'oacute': 243,
    'ocirc': 244,
    'ograve': 242,
    'oslash': 248,
    'otilde': 245,
    'ouml': 246,
    'szlig': 223,
    'thorn': 254,
    'uacute': 250,
    'ucirc': 251,
    'ugrave': 249,
    'uuml': 252,
    'yacute': 253,
    'yuml': 255,
    'copy': 169,
    'reg': 174,
    'nbsp': 160,
    'iexcl': 161,
    'cent': 162,
    'pound': 163,
    'curren': 164,
    'yen': 165,
    'brvbar': 166,
    'sect': 167,
    'uml': 168,
    'ordf': 170,
    'laquo': 171,
    'not': 172,
    'shy': 173,
    'macr': 175,
    'deg': 176,
    'plusmn': 177,
    'sup1': 185,
    'sup2': 178,
    'sup3': 179,
    'acute': 180,
    'micro': 181,
    'para': 182,
    'middot': 183,
    'cedil': 184,
    'ordm': 186,
    'raquo': 187,
    'frac14': 188,
    'frac12': 189,
    'frac34': 190,
    'iquest': 191,
    'times': 215,
    'divide': 247,
    'OElig': 338,
    'oelig': 339,
    'Scaron': 352,
    'scaron': 353,
    'Yuml': 376,
    'fnof': 402,
    'circ': 710,
    'tilde': 732,
    'Alpha': 913,
    'Beta': 914,
    'Gamma': 915,
    'Delta': 916,
    'Epsilon': 917,
    'Zeta': 918,
    'Eta': 919,
    'Theta': 920,
    'Iota': 921,
    'Kappa': 922,
    'Lambda': 923,
    'Mu': 924,
    'Nu': 925,
    'Xi': 926,
    'Omicron': 927,
    'Pi': 928,
    'Rho': 929,
    'Sigma': 931,
    'Tau': 932,
    'Upsilon': 933,
    'Phi': 934,
    'Chi': 935,
    'Psi': 936,
    'Omega': 937,
    'alpha': 945,
    'beta': 946,
    'gamma': 947,
    'delta': 948,
    'epsilon': 949,
    'zeta': 950,
    'eta': 951,
    'theta': 952,
    'iota': 953,
    'kappa': 954,
    'lambda': 955,
    'mu': 956,
    'nu': 957,
    'xi': 958,
    'omicron': 959,
    'pi': 960,
    'rho': 961,
    'sigmaf': 962,
    'sigma': 963,
    'tau': 964,
    'upsilon': 965,
    'phi': 966,
    'chi': 967,
    'psi': 968,
    'omega': 969,
    'thetasym': 977,
    'upsih': 978,
    'piv': 982,
    'ensp': 8194,
    'emsp': 8195,
    'thinsp': 8201,
    'zwnj': 8204,
    'zwj': 8205,
    'lrm': 8206,
    'rlm': 8207,
    'ndash': 8211,
    'mdash': 8212,
    'lsquo': 8216,
    'rsquo': 8217,
    'sbquo': 8218,
    'ldquo': 8220,
    'rdquo': 8221,
    'bdquo': 8222,
    'dagger': 8224,
    'Dagger': 8225,
    'bull': 8226,
    'hellip': 8230,
    'permil': 8240,
    'prime': 8242,
    'Prime': 8243,
    'lsaquo': 8249,
    'rsaquo': 8250,
    'oline': 8254,
    'frasl': 8260,
    'euro': 8364,
    'image': 8465,
    'weierp': 8472,
    'real': 8476,
    'trade': 8482,
    'alefsym': 8501,
    'larr': 8592,
    'uarr': 8593,
    'rarr': 8594,
    'darr': 8595,
    'harr': 8596,
    'crarr': 8629,
    'lArr': 8656,
    'uArr': 8657,
    'rArr': 8658,
    'dArr': 8659,
    'hArr': 8660,
    'forall': 8704,
    'part': 8706,
    'exist': 8707,
    'empty': 8709,
    'nabla': 8711,
    'isin': 8712,
    'notin': 8713,
    'ni': 8715,
    'prod': 8719,
    'sum': 8721,
    'minus': 8722,
    'lowast': 8727,
    'radic': 8730,
    'prop': 8733,
    'infin': 8734,
    'ang': 8736,
    'and': 8743,
    'or': 8744,
    'cap': 8745,
    'cup': 8746,
    'int': 8747,
    'there4': 8756,
    'sim': 8764,
    'cong': 8773,
    'asymp': 8776,
    'ne': 8800,
    'equiv': 8801,
    'le': 8804,
    'ge': 8805,
    'sub': 8834,
    'sup': 8835,
    'nsub': 8836,
    'sube': 8838,
    'supe': 8839,
    'oplus': 8853,
    'otimes': 8855,
    'perp': 8869,
    'sdot': 8901,
    'lceil': 8968,
    'rceil': 8969,
    'lfloor': 8970,
    'rfloor': 8971,
    'lang': 9001,
    'rang': 9002,
    'loz': 9674,
    'spades': 9824,
    'clubs': 9827,
    'hearts': 9829,
    'diams': 9830
  };

  Object.keys(sax.ENTITIES).forEach(function (key) {
    var e = sax.ENTITIES[key];
    var s = typeof e === 'number' ? String.fromCharCode(e) : e;
    sax.ENTITIES[key] = s;
  });

  for (var s in sax.STATE) {
    sax.STATE[sax.STATE[s]] = s;
  }

  // shorthand
  S = sax.STATE;

  function emit (parser, event, data) {
    parser[event] && parser[event](data);
  }

  function emitNode (parser, nodeType, data) {
    if (parser.textNode) closeText(parser);
    emit(parser, nodeType, data);
  }

  function closeText (parser) {
    parser.textNode = textopts(parser.opt, parser.textNode);
    if (parser.textNode) emit(parser, 'ontext', parser.textNode);
    parser.textNode = '';
  }

  function textopts (opt, text) {
    if (opt.trim) text = text.trim();
    if (opt.normalize) text = text.replace(/\s+/g, ' ');
    return text
  }

  function error (parser, er) {
    closeText(parser);
    if (parser.trackPosition) {
      er += '\nLine: ' + parser.line +
        '\nColumn: ' + parser.column +
        '\nChar: ' + parser.c;
    }
    er = new Error(er);
    parser.error = er;
    emit(parser, 'onerror', er);
    return parser
  }

  function end (parser) {
    if (parser.sawRoot && !parser.closedRoot) strictFail(parser, 'Unclosed root tag');
    if ((parser.state !== S.BEGIN) &&
      (parser.state !== S.BEGIN_WHITESPACE) &&
      (parser.state !== S.TEXT)) {
      error(parser, 'Unexpected end');
    }
    closeText(parser);
    parser.c = '';
    parser.closed = true;
    emit(parser, 'onend');
    SAXParser.call(parser, parser.strict, parser.opt);
    return parser
  }

  function strictFail (parser, message) {
    if (typeof parser !== 'object' || !(parser instanceof SAXParser)) {
      throw new Error('bad call to strictFail')
    }
    if (parser.strict) {
      error(parser, message);
    }
  }

  function newTag (parser) {
    if (!parser.strict) parser.tagName = parser.tagName[parser.looseCase]();
    var parent = parser.tags[parser.tags.length - 1] || parser;
    var tag = parser.tag = { name: parser.tagName, attributes: {} };

    // will be overridden if tag contails an xmlns="foo" or xmlns:foo="bar"
    if (parser.opt.xmlns) {
      tag.ns = parent.ns;
    }
    parser.attribList.length = 0;
    emitNode(parser, 'onopentagstart', tag);
  }

  function qname (name, attribute) {
    var i = name.indexOf(':');
    var qualName = i < 0 ? [ '', name ] : name.split(':');
    var prefix = qualName[0];
    var local = qualName[1];

    // <x "xmlns"="http://foo">
    if (attribute && name === 'xmlns') {
      prefix = 'xmlns';
      local = '';
    }

    return { prefix: prefix, local: local }
  }

  function attrib (parser) {
    if (!parser.strict) {
      parser.attribName = parser.attribName[parser.looseCase]();
    }

    if (parser.attribList.indexOf(parser.attribName) !== -1 ||
      parser.tag.attributes.hasOwnProperty(parser.attribName)) {
      parser.attribName = parser.attribValue = '';
      return
    }

    if (parser.opt.xmlns) {
      var qn = qname(parser.attribName, true);
      var prefix = qn.prefix;
      var local = qn.local;

      if (prefix === 'xmlns') {
        // namespace binding attribute. push the binding into scope
        if (local === 'xml' && parser.attribValue !== XML_NAMESPACE) {
          strictFail(parser,
            'xml: prefix must be bound to ' + XML_NAMESPACE + '\n' +
            'Actual: ' + parser.attribValue);
        } else if (local === 'xmlns' && parser.attribValue !== XMLNS_NAMESPACE) {
          strictFail(parser,
            'xmlns: prefix must be bound to ' + XMLNS_NAMESPACE + '\n' +
            'Actual: ' + parser.attribValue);
        } else {
          var tag = parser.tag;
          var parent = parser.tags[parser.tags.length - 1] || parser;
          if (tag.ns === parent.ns) {
            tag.ns = Object.create(parent.ns);
          }
          tag.ns[local] = parser.attribValue;
        }
      }

      // defer onattribute events until all attributes have been seen
      // so any new bindings can take effect. preserve attribute order
      // so deferred events can be emitted in document order
      parser.attribList.push([parser.attribName, parser.attribValue]);
    } else {
      // in non-xmlns mode, we can emit the event right away
      parser.tag.attributes[parser.attribName] = parser.attribValue;
      emitNode(parser, 'onattribute', {
        name: parser.attribName,
        value: parser.attribValue
      });
    }

    parser.attribName = parser.attribValue = '';
  }

  function openTag (parser, selfClosing) {
    if (parser.opt.xmlns) {
      // emit namespace binding events
      var tag = parser.tag;

      // add namespace info to tag
      var qn = qname(parser.tagName);
      tag.prefix = qn.prefix;
      tag.local = qn.local;
      tag.uri = tag.ns[qn.prefix] || '';

      if (tag.prefix && !tag.uri) {
        strictFail(parser, 'Unbound namespace prefix: ' +
          JSON.stringify(parser.tagName));
        tag.uri = qn.prefix;
      }

      var parent = parser.tags[parser.tags.length - 1] || parser;
      if (tag.ns && parent.ns !== tag.ns) {
        Object.keys(tag.ns).forEach(function (p) {
          emitNode(parser, 'onopennamespace', {
            prefix: p,
            uri: tag.ns[p]
          });
        });
      }

      // handle deferred onattribute events
      // Note: do not apply default ns to attributes:
      //   http://www.w3.org/TR/REC-xml-names/#defaulting
      for (var i = 0, l = parser.attribList.length; i < l; i++) {
        var nv = parser.attribList[i];
        var name = nv[0];
        var value = nv[1];
        var qualName = qname(name, true);
        var prefix = qualName.prefix;
        var local = qualName.local;
        var uri = prefix === '' ? '' : (tag.ns[prefix] || '');
        var a = {
          name: name,
          value: value,
          prefix: prefix,
          local: local,
          uri: uri
        };

        // if there's any attributes with an undefined namespace,
        // then fail on them now.
        if (prefix && prefix !== 'xmlns' && !uri) {
          strictFail(parser, 'Unbound namespace prefix: ' +
            JSON.stringify(prefix));
          a.uri = prefix;
        }
        parser.tag.attributes[name] = a;
        emitNode(parser, 'onattribute', a);
      }
      parser.attribList.length = 0;
    }

    parser.tag.isSelfClosing = !!selfClosing;

    // process the tag
    parser.sawRoot = true;
    parser.tags.push(parser.tag);
    emitNode(parser, 'onopentag', parser.tag);
    if (!selfClosing) {
      // special case for <script> in non-strict mode.
      if (!parser.noscript && parser.tagName.toLowerCase() === 'script') {
        parser.state = S.SCRIPT;
      } else {
        parser.state = S.TEXT;
      }
      parser.tag = null;
      parser.tagName = '';
    }
    parser.attribName = parser.attribValue = '';
    parser.attribList.length = 0;
  }

  function closeTag (parser) {
    if (!parser.tagName) {
      strictFail(parser, 'Weird empty close tag.');
      parser.textNode += '</>';
      parser.state = S.TEXT;
      return
    }

    if (parser.script) {
      if (parser.tagName !== 'script') {
        parser.script += '</' + parser.tagName + '>';
        parser.tagName = '';
        parser.state = S.SCRIPT;
        return
      }
      emitNode(parser, 'onscript', parser.script);
      parser.script = '';
    }

    // first make sure that the closing tag actually exists.
    // <a><b></c></b></a> will close everything, otherwise.
    var t = parser.tags.length;
    var tagName = parser.tagName;
    if (!parser.strict) {
      tagName = tagName[parser.looseCase]();
    }
    var closeTo = tagName;
    while (t--) {
      var close = parser.tags[t];
      if (close.name !== closeTo) {
        // fail the first time in strict mode
        strictFail(parser, 'Unexpected close tag');
      } else {
        break
      }
    }

    // didn't find it.  we already failed for strict, so just abort.
    if (t < 0) {
      strictFail(parser, 'Unmatched closing tag: ' + parser.tagName);
      parser.textNode += '</' + parser.tagName + '>';
      parser.state = S.TEXT;
      return
    }
    parser.tagName = tagName;
    var s = parser.tags.length;
    while (s-- > t) {
      var tag = parser.tag = parser.tags.pop();
      parser.tagName = parser.tag.name;
      emitNode(parser, 'onclosetag', parser.tagName);

      var x = {};
      for (var i in tag.ns) {
        x[i] = tag.ns[i];
      }

      var parent = parser.tags[parser.tags.length - 1] || parser;
      if (parser.opt.xmlns && tag.ns !== parent.ns) {
        // remove namespace bindings introduced by tag
        Object.keys(tag.ns).forEach(function (p) {
          var n = tag.ns[p];
          emitNode(parser, 'onclosenamespace', { prefix: p, uri: n });
        });
      }
    }
    if (t === 0) parser.closedRoot = true;
    parser.tagName = parser.attribValue = parser.attribName = '';
    parser.attribList.length = 0;
    parser.state = S.TEXT;
  }

  function parseEntity (parser) {
    var entity = parser.entity;
    var entityLC = entity.toLowerCase();
    var num;
    var numStr = '';

    if (parser.ENTITIES[entity]) {
      return parser.ENTITIES[entity]
    }
    if (parser.ENTITIES[entityLC]) {
      return parser.ENTITIES[entityLC]
    }
    entity = entityLC;
    if (entity.charAt(0) === '#') {
      if (entity.charAt(1) === 'x') {
        entity = entity.slice(2);
        num = parseInt(entity, 16);
        numStr = num.toString(16);
      } else {
        entity = entity.slice(1);
        num = parseInt(entity, 10);
        numStr = num.toString(10);
      }
    }
    entity = entity.replace(/^0+/, '');
    if (isNaN(num) || numStr.toLowerCase() !== entity) {
      strictFail(parser, 'Invalid character entity');
      return '&' + parser.entity + ';'
    }

    return String.fromCodePoint(num)
  }

  function beginWhiteSpace (parser, c) {
    if (c === '<') {
      parser.state = S.OPEN_WAKA;
      parser.startTagPosition = parser.position;
    } else if (!isWhitespace(c)) {
      // have to process this as a text node.
      // weird, but happens.
      strictFail(parser, 'Non-whitespace before first tag.');
      parser.textNode = c;
      parser.state = S.TEXT;
    }
  }

  function charAt (chunk, i) {
    var result = '';
    if (i < chunk.length) {
      result = chunk.charAt(i);
    }
    return result
  }

  function write (chunk) {
    var parser = this;
    if (this.error) {
      throw this.error
    }
    if (parser.closed) {
      return error(parser,
        'Cannot write after close. Assign an onready handler.')
    }
    if (chunk === null) {
      return end(parser)
    }
    if (typeof chunk === 'object') {
      chunk = chunk.toString();
    }
    var i = 0;
    var c = '';
    while (true) {
      c = charAt(chunk, i++);
      parser.c = c;

      if (!c) {
        break
      }

      if (parser.trackPosition) {
        parser.position++;
        if (c === '\n') {
          parser.line++;
          parser.column = 0;
        } else {
          parser.column++;
        }
      }

      switch (parser.state) {
        case S.BEGIN:
          parser.state = S.BEGIN_WHITESPACE;
          if (c === '\uFEFF') {
            continue
          }
          beginWhiteSpace(parser, c);
          continue

        case S.BEGIN_WHITESPACE:
          beginWhiteSpace(parser, c);
          continue

        case S.TEXT:
          if (parser.sawRoot && !parser.closedRoot) {
            var starti = i - 1;
            while (c && c !== '<' && c !== '&') {
              c = charAt(chunk, i++);
              if (c && parser.trackPosition) {
                parser.position++;
                if (c === '\n') {
                  parser.line++;
                  parser.column = 0;
                } else {
                  parser.column++;
                }
              }
            }
            parser.textNode += chunk.substring(starti, i - 1);
          }
          if (c === '<' && !(parser.sawRoot && parser.closedRoot && !parser.strict)) {
            parser.state = S.OPEN_WAKA;
            parser.startTagPosition = parser.position;
          } else {
            if (!isWhitespace(c) && (!parser.sawRoot || parser.closedRoot)) {
              strictFail(parser, 'Text data outside of root node.');
            }
            if (c === '&') {
              parser.state = S.TEXT_ENTITY;
            } else {
              parser.textNode += c;
            }
          }
          continue

        case S.SCRIPT:
          // only non-strict
          if (c === '<') {
            parser.state = S.SCRIPT_ENDING;
          } else {
            parser.script += c;
          }
          continue

        case S.SCRIPT_ENDING:
          if (c === '/') {
            parser.state = S.CLOSE_TAG;
          } else {
            parser.script += '<' + c;
            parser.state = S.SCRIPT;
          }
          continue

        case S.OPEN_WAKA:
          // either a /, ?, !, or text is coming next.
          if (c === '!') {
            parser.state = S.SGML_DECL;
            parser.sgmlDecl = '';
          } else if (isWhitespace(c)) ; else if (isMatch(nameStart, c)) {
            parser.state = S.OPEN_TAG;
            parser.tagName = c;
          } else if (c === '/') {
            parser.state = S.CLOSE_TAG;
            parser.tagName = '';
          } else if (c === '?') {
            parser.state = S.PROC_INST;
            parser.procInstName = parser.procInstBody = '';
          } else {
            strictFail(parser, 'Unencoded <');
            // if there was some whitespace, then add that in.
            if (parser.startTagPosition + 1 < parser.position) {
              var pad = parser.position - parser.startTagPosition;
              c = new Array(pad).join(' ') + c;
            }
            parser.textNode += '<' + c;
            parser.state = S.TEXT;
          }
          continue

        case S.SGML_DECL:
          if ((parser.sgmlDecl + c).toUpperCase() === CDATA) {
            emitNode(parser, 'onopencdata');
            parser.state = S.CDATA;
            parser.sgmlDecl = '';
            parser.cdata = '';
          } else if (parser.sgmlDecl + c === '--') {
            parser.state = S.COMMENT;
            parser.comment = '';
            parser.sgmlDecl = '';
          } else if ((parser.sgmlDecl + c).toUpperCase() === DOCTYPE) {
            parser.state = S.DOCTYPE;
            if (parser.doctype || parser.sawRoot) {
              strictFail(parser,
                'Inappropriately located doctype declaration');
            }
            parser.doctype = '';
            parser.sgmlDecl = '';
          } else if (c === '>') {
            emitNode(parser, 'onsgmldeclaration', parser.sgmlDecl);
            parser.sgmlDecl = '';
            parser.state = S.TEXT;
          } else if (isQuote(c)) {
            parser.state = S.SGML_DECL_QUOTED;
            parser.sgmlDecl += c;
          } else {
            parser.sgmlDecl += c;
          }
          continue

        case S.SGML_DECL_QUOTED:
          if (c === parser.q) {
            parser.state = S.SGML_DECL;
            parser.q = '';
          }
          parser.sgmlDecl += c;
          continue

        case S.DOCTYPE:
          if (c === '>') {
            parser.state = S.TEXT;
            emitNode(parser, 'ondoctype', parser.doctype);
            parser.doctype = true; // just remember that we saw it.
          } else {
            parser.doctype += c;
            if (c === '[') {
              parser.state = S.DOCTYPE_DTD;
            } else if (isQuote(c)) {
              parser.state = S.DOCTYPE_QUOTED;
              parser.q = c;
            }
          }
          continue

        case S.DOCTYPE_QUOTED:
          parser.doctype += c;
          if (c === parser.q) {
            parser.q = '';
            parser.state = S.DOCTYPE;
          }
          continue

        case S.DOCTYPE_DTD:
          parser.doctype += c;
          if (c === ']') {
            parser.state = S.DOCTYPE;
          } else if (isQuote(c)) {
            parser.state = S.DOCTYPE_DTD_QUOTED;
            parser.q = c;
          }
          continue

        case S.DOCTYPE_DTD_QUOTED:
          parser.doctype += c;
          if (c === parser.q) {
            parser.state = S.DOCTYPE_DTD;
            parser.q = '';
          }
          continue

        case S.COMMENT:
          if (c === '-') {
            parser.state = S.COMMENT_ENDING;
          } else {
            parser.comment += c;
          }
          continue

        case S.COMMENT_ENDING:
          if (c === '-') {
            parser.state = S.COMMENT_ENDED;
            parser.comment = textopts(parser.opt, parser.comment);
            if (parser.comment) {
              emitNode(parser, 'oncomment', parser.comment);
            }
            parser.comment = '';
          } else {
            parser.comment += '-' + c;
            parser.state = S.COMMENT;
          }
          continue

        case S.COMMENT_ENDED:
          if (c !== '>') {
            strictFail(parser, 'Malformed comment');
            // allow <!-- blah -- bloo --> in non-strict mode,
            // which is a comment of " blah -- bloo "
            parser.comment += '--' + c;
            parser.state = S.COMMENT;
          } else {
            parser.state = S.TEXT;
          }
          continue

        case S.CDATA:
          if (c === ']') {
            parser.state = S.CDATA_ENDING;
          } else {
            parser.cdata += c;
          }
          continue

        case S.CDATA_ENDING:
          if (c === ']') {
            parser.state = S.CDATA_ENDING_2;
          } else {
            parser.cdata += ']' + c;
            parser.state = S.CDATA;
          }
          continue

        case S.CDATA_ENDING_2:
          if (c === '>') {
            if (parser.cdata) {
              emitNode(parser, 'oncdata', parser.cdata);
            }
            emitNode(parser, 'onclosecdata');
            parser.cdata = '';
            parser.state = S.TEXT;
          } else if (c === ']') {
            parser.cdata += ']';
          } else {
            parser.cdata += ']]' + c;
            parser.state = S.CDATA;
          }
          continue

        case S.PROC_INST:
          if (c === '?') {
            parser.state = S.PROC_INST_ENDING;
          } else if (isWhitespace(c)) {
            parser.state = S.PROC_INST_BODY;
          } else {
            parser.procInstName += c;
          }
          continue

        case S.PROC_INST_BODY:
          if (!parser.procInstBody && isWhitespace(c)) {
            continue
          } else if (c === '?') {
            parser.state = S.PROC_INST_ENDING;
          } else {
            parser.procInstBody += c;
          }
          continue

        case S.PROC_INST_ENDING:
          if (c === '>') {
            emitNode(parser, 'onprocessinginstruction', {
              name: parser.procInstName,
              body: parser.procInstBody
            });
            parser.procInstName = parser.procInstBody = '';
            parser.state = S.TEXT;
          } else {
            parser.procInstBody += '?' + c;
            parser.state = S.PROC_INST_BODY;
          }
          continue

        case S.OPEN_TAG:
          if (isMatch(nameBody, c)) {
            parser.tagName += c;
          } else {
            newTag(parser);
            if (c === '>') {
              openTag(parser);
            } else if (c === '/') {
              parser.state = S.OPEN_TAG_SLASH;
            } else {
              if (!isWhitespace(c)) {
                strictFail(parser, 'Invalid character in tag name');
              }
              parser.state = S.ATTRIB;
            }
          }
          continue

        case S.OPEN_TAG_SLASH:
          if (c === '>') {
            openTag(parser, true);
            closeTag(parser);
          } else {
            strictFail(parser, 'Forward-slash in opening tag not followed by >');
            parser.state = S.ATTRIB;
          }
          continue

        case S.ATTRIB:
          // haven't read the attribute name yet.
          if (isWhitespace(c)) {
            continue
          } else if (c === '>') {
            openTag(parser);
          } else if (c === '/') {
            parser.state = S.OPEN_TAG_SLASH;
          } else if (isMatch(nameStart, c)) {
            parser.attribName = c;
            parser.attribValue = '';
            parser.state = S.ATTRIB_NAME;
          } else {
            strictFail(parser, 'Invalid attribute name');
          }
          continue

        case S.ATTRIB_NAME:
          if (c === '=') {
            parser.state = S.ATTRIB_VALUE;
          } else if (c === '>') {
            strictFail(parser, 'Attribute without value');
            parser.attribValue = parser.attribName;
            attrib(parser);
            openTag(parser);
          } else if (isWhitespace(c)) {
            parser.state = S.ATTRIB_NAME_SAW_WHITE;
          } else if (isMatch(nameBody, c)) {
            parser.attribName += c;
          } else {
            strictFail(parser, 'Invalid attribute name');
          }
          continue

        case S.ATTRIB_NAME_SAW_WHITE:
          if (c === '=') {
            parser.state = S.ATTRIB_VALUE;
          } else if (isWhitespace(c)) {
            continue
          } else {
            strictFail(parser, 'Attribute without value');
            parser.tag.attributes[parser.attribName] = '';
            parser.attribValue = '';
            emitNode(parser, 'onattribute', {
              name: parser.attribName,
              value: ''
            });
            parser.attribName = '';
            if (c === '>') {
              openTag(parser);
            } else if (isMatch(nameStart, c)) {
              parser.attribName = c;
              parser.state = S.ATTRIB_NAME;
            } else {
              strictFail(parser, 'Invalid attribute name');
              parser.state = S.ATTRIB;
            }
          }
          continue

        case S.ATTRIB_VALUE:
          if (isWhitespace(c)) {
            continue
          } else if (isQuote(c)) {
            parser.q = c;
            parser.state = S.ATTRIB_VALUE_QUOTED;
          } else {
            strictFail(parser, 'Unquoted attribute value');
            parser.state = S.ATTRIB_VALUE_UNQUOTED;
            parser.attribValue = c;
          }
          continue

        case S.ATTRIB_VALUE_QUOTED:
          if (c !== parser.q) {
            if (c === '&') {
              parser.state = S.ATTRIB_VALUE_ENTITY_Q;
            } else {
              parser.attribValue += c;
            }
            continue
          }
          attrib(parser);
          parser.q = '';
          parser.state = S.ATTRIB_VALUE_CLOSED;
          continue

        case S.ATTRIB_VALUE_CLOSED:
          if (isWhitespace(c)) {
            parser.state = S.ATTRIB;
          } else if (c === '>') {
            openTag(parser);
          } else if (c === '/') {
            parser.state = S.OPEN_TAG_SLASH;
          } else if (isMatch(nameStart, c)) {
            strictFail(parser, 'No whitespace between attributes');
            parser.attribName = c;
            parser.attribValue = '';
            parser.state = S.ATTRIB_NAME;
          } else {
            strictFail(parser, 'Invalid attribute name');
          }
          continue

        case S.ATTRIB_VALUE_UNQUOTED:
          if (!isAttribEnd(c)) {
            if (c === '&') {
              parser.state = S.ATTRIB_VALUE_ENTITY_U;
            } else {
              parser.attribValue += c;
            }
            continue
          }
          attrib(parser);
          if (c === '>') {
            openTag(parser);
          } else {
            parser.state = S.ATTRIB;
          }
          continue

        case S.CLOSE_TAG:
          if (!parser.tagName) {
            if (isWhitespace(c)) {
              continue
            } else if (notMatch(nameStart, c)) {
              if (parser.script) {
                parser.script += '</' + c;
                parser.state = S.SCRIPT;
              } else {
                strictFail(parser, 'Invalid tagname in closing tag.');
              }
            } else {
              parser.tagName = c;
            }
          } else if (c === '>') {
            closeTag(parser);
          } else if (isMatch(nameBody, c)) {
            parser.tagName += c;
          } else if (parser.script) {
            parser.script += '</' + parser.tagName;
            parser.tagName = '';
            parser.state = S.SCRIPT;
          } else {
            if (!isWhitespace(c)) {
              strictFail(parser, 'Invalid tagname in closing tag');
            }
            parser.state = S.CLOSE_TAG_SAW_WHITE;
          }
          continue

        case S.CLOSE_TAG_SAW_WHITE:
          if (isWhitespace(c)) {
            continue
          }
          if (c === '>') {
            closeTag(parser);
          } else {
            strictFail(parser, 'Invalid characters in closing tag');
          }
          continue

        case S.TEXT_ENTITY:
        case S.ATTRIB_VALUE_ENTITY_Q:
        case S.ATTRIB_VALUE_ENTITY_U:
          var returnState;
          var buffer;
          switch (parser.state) {
            case S.TEXT_ENTITY:
              returnState = S.TEXT;
              buffer = 'textNode';
              break

            case S.ATTRIB_VALUE_ENTITY_Q:
              returnState = S.ATTRIB_VALUE_QUOTED;
              buffer = 'attribValue';
              break

            case S.ATTRIB_VALUE_ENTITY_U:
              returnState = S.ATTRIB_VALUE_UNQUOTED;
              buffer = 'attribValue';
              break
          }

          if (c === ';') {
            parser[buffer] += parseEntity(parser);
            parser.entity = '';
            parser.state = returnState;
          } else if (isMatch(parser.entity.length ? entityBody : entityStart, c)) {
            parser.entity += c;
          } else {
            strictFail(parser, 'Invalid character in entity name');
            parser[buffer] += '&' + parser.entity + c;
            parser.entity = '';
            parser.state = returnState;
          }

          continue

        default:
          throw new Error(parser, 'Unknown state: ' + parser.state)
      }
    } // while

    if (parser.position >= parser.bufferCheckPosition) {
      checkBufferLength(parser);
    }
    return parser
  }

  /*! http://mths.be/fromcodepoint v0.1.0 by @mathias */
  /* istanbul ignore next */
  if (!String.fromCodePoint) {
    (function () {
      var stringFromCharCode = String.fromCharCode;
      var floor = Math.floor;
      var fromCodePoint = function () {
        var MAX_SIZE = 0x4000;
        var codeUnits = [];
        var highSurrogate;
        var lowSurrogate;
        var index = -1;
        var length = arguments.length;
        if (!length) {
          return ''
        }
        var result = '';
        while (++index < length) {
          var codePoint = Number(arguments[index]);
          if (
            !isFinite(codePoint) || // `NaN`, `+Infinity`, or `-Infinity`
            codePoint < 0 || // not a valid Unicode code point
            codePoint > 0x10FFFF || // not a valid Unicode code point
            floor(codePoint) !== codePoint // not an integer
          ) {
            throw RangeError('Invalid code point: ' + codePoint)
          }
          if (codePoint <= 0xFFFF) { // BMP code point
            codeUnits.push(codePoint);
          } else { // Astral code point; split in surrogate halves
            // http://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
            codePoint -= 0x10000;
            highSurrogate = (codePoint >> 10) + 0xD800;
            lowSurrogate = (codePoint % 0x400) + 0xDC00;
            codeUnits.push(highSurrogate, lowSurrogate);
          }
          if (index + 1 === length || codeUnits.length > MAX_SIZE) {
            result += stringFromCharCode.apply(null, codeUnits);
            codeUnits.length = 0;
          }
        }
        return result
      };
      /* istanbul ignore next */
      if (Object.defineProperty) {
        Object.defineProperty(String, 'fromCodePoint', {
          value: fromCodePoint,
          configurable: true,
          writable: true
        });
      } else {
        String.fromCodePoint = fromCodePoint;
      }
    }());
  }
})(exports);
});

var arrayHelper = {

  isArray: function(value) {
    if (Array.isArray) {
      return Array.isArray(value);
    }
    // fallback for older browsers like  IE 8
    return Object.prototype.toString.call( value ) === '[object Array]';
  }

};

var isArray = arrayHelper.isArray;

var optionsHelper = {

  copyOptions: function (options) {
    var key, copy = {};
    for (key in options) {
      if (options.hasOwnProperty(key)) {
        copy[key] = options[key];
      }
    }
    return copy;
  },

  ensureFlagExists: function (item, options) {
    if (!(item in options) || typeof options[item] !== 'boolean') {
      options[item] = false;
    }
  },

  ensureSpacesExists: function (options) {
    if (!('spaces' in options) || (typeof options.spaces !== 'number' && typeof options.spaces !== 'string')) {
      options.spaces = 0;
    }
  },

  ensureAlwaysArrayExists: function (options) {
    if (!('alwaysArray' in options) || (typeof options.alwaysArray !== 'boolean' && !isArray(options.alwaysArray))) {
      options.alwaysArray = false;
    }
  },

  ensureKeyExists: function (key, options) {
    if (!(key + 'Key' in options) || typeof options[key + 'Key'] !== 'string') {
      options[key + 'Key'] = options.compact ? '_' + key : key;
    }
  },

  checkFnExists: function (key, options) {
    return key + 'Fn' in options;
  }

};

var isArray$1 = arrayHelper.isArray;

var options;
var currentElement;

function validateOptions(userOptions) {
  options = optionsHelper.copyOptions(userOptions);
  optionsHelper.ensureFlagExists('ignoreDeclaration', options);
  optionsHelper.ensureFlagExists('ignoreInstruction', options);
  optionsHelper.ensureFlagExists('ignoreAttributes', options);
  optionsHelper.ensureFlagExists('ignoreText', options);
  optionsHelper.ensureFlagExists('ignoreComment', options);
  optionsHelper.ensureFlagExists('ignoreCdata', options);
  optionsHelper.ensureFlagExists('ignoreDoctype', options);
  optionsHelper.ensureFlagExists('compact', options);
  optionsHelper.ensureFlagExists('alwaysChildren', options);
  optionsHelper.ensureFlagExists('addParent', options);
  optionsHelper.ensureFlagExists('trim', options);
  optionsHelper.ensureFlagExists('nativeType', options);
  optionsHelper.ensureFlagExists('nativeTypeAttributes', options);
  optionsHelper.ensureFlagExists('sanitize', options);
  optionsHelper.ensureFlagExists('instructionHasAttributes', options);
  optionsHelper.ensureFlagExists('captureSpacesBetweenElements', options);
  optionsHelper.ensureAlwaysArrayExists(options);
  optionsHelper.ensureKeyExists('declaration', options);
  optionsHelper.ensureKeyExists('instruction', options);
  optionsHelper.ensureKeyExists('attributes', options);
  optionsHelper.ensureKeyExists('text', options);
  optionsHelper.ensureKeyExists('comment', options);
  optionsHelper.ensureKeyExists('cdata', options);
  optionsHelper.ensureKeyExists('doctype', options);
  optionsHelper.ensureKeyExists('type', options);
  optionsHelper.ensureKeyExists('name', options);
  optionsHelper.ensureKeyExists('elements', options);
  optionsHelper.ensureKeyExists('parent', options);
  return options;
}

function nativeType(value) {
  var nValue = Number(value);
  if (!isNaN(nValue)) {
    return nValue;
  }
  var bValue = value.toLowerCase();
  if (bValue === 'true') {
    return true;
  } else if (bValue === 'false') {
    return false;
  }
  return value;
}

function addField(type, value) {
  var key;
  if (options.compact) {
    if (
      !currentElement[options[type + 'Key']] &&
      (isArray$1(options.alwaysArray) ? options.alwaysArray.indexOf(options[type + 'Key']) !== -1 : options.alwaysArray)
    ) {
      currentElement[options[type + 'Key']] = [];
    }
    if (currentElement[options[type + 'Key']] && !isArray$1(currentElement[options[type + 'Key']])) {
      currentElement[options[type + 'Key']] = [currentElement[options[type + 'Key']]];
    }
    if (type + 'Fn' in options && typeof value === 'string') {
      value = options[type + 'Fn'](value, currentElement);
    }
    if (type === 'instruction' && ('instructionFn' in options || 'instructionNameFn' in options)) {
      for (key in value) {
        if (value.hasOwnProperty(key)) {
          if ('instructionFn' in options) {
            value[key] = options.instructionFn(value[key], key, currentElement);
          } else {
            var temp = value[key];
            delete value[key];
            value[options.instructionNameFn(key, temp, currentElement)] = temp;
          }
        }
      }
    }
    if (isArray$1(currentElement[options[type + 'Key']])) {
      currentElement[options[type + 'Key']].push(value);
    } else {
      currentElement[options[type + 'Key']] = value;
    }
  } else {
    if (!currentElement[options.elementsKey]) {
      currentElement[options.elementsKey] = [];
    }
    var element = {};
    element[options.typeKey] = type;
    if (type === 'instruction') {
      for (key in value) {
        if (value.hasOwnProperty(key)) {
          break;
        }
      }
      element[options.nameKey] = 'instructionNameFn' in options ? options.instructionNameFn(key, value, currentElement) : key;
      if (options.instructionHasAttributes) {
        element[options.attributesKey] = value[key][options.attributesKey];
        if ('instructionFn' in options) {
          element[options.attributesKey] = options.instructionFn(element[options.attributesKey], key, currentElement);
        }
      } else {
        if ('instructionFn' in options) {
          value[key] = options.instructionFn(value[key], key, currentElement);
        }
        element[options