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+'use strict';
+
+
+////////////////////////////////////////////////////////////////////////////////
+// Helpers
+
+// Merge objects
+//
+function assign(obj /*from1, from2, from3, ...*/) {
+  var sources = Array.prototype.slice.call(arguments, 1);
+
+  sources.forEach(function (source) {
+    if (!source) { return; }
+
+    Object.keys(source).forEach(function (key) {
+      obj[key] = source[key];
+    });
+  });
+
+  return obj;
+}
+
+function _class(obj) { return Object.prototype.toString.call(obj); }
+function isString(obj) { return _class(obj) === '[object String]'; }
+function isObject(obj) { return _class(obj) === '[object Object]'; }
+function isRegExp(obj) { return _class(obj) === '[object RegExp]'; }
+function isFunction(obj) { return _class(obj) === '[object Function]'; }
+
+
+function escapeRE(str) { return str.replace(/[.?*+^$[\]\\(){}|-]/g, '\\$&'); }
+
+////////////////////////////////////////////////////////////////////////////////
+
+
+var defaultOptions = {
+  fuzzyLink: true,
+  fuzzyEmail: true,
+  fuzzyIP: false
+};
+
+
+function isOptionsObj(obj) {
+  return Object.keys(obj || {}).reduce(function (acc, k) {
+    return acc || defaultOptions.hasOwnProperty(k);
+  }, false);
+}
+
+
+var defaultSchemas = {
+  'http:': {
+    validate: function (text, pos, self) {
+      var tail = text.slice(pos);
+
+      if (!self.re.http) {
+        // compile lazily, because "host"-containing variables can change on tlds update.
+        self.re.http =  new RegExp(
+          '^\\/\\/' + self.re.src_auth + self.re.src_host_port_strict + self.re.src_path, 'i'
+        );
+      }
+      if (self.re.http.test(tail)) {
+        return tail.match(self.re.http)[0].length;
+      }
+      return 0;
+    }
+  },
+  'https:':  'http:',
+  'ftp:':    'http:',
+  '//':      {
+    validate: function (text, pos, self) {
+      var tail = text.slice(pos);
+
+      if (!self.re.no_http) {
+      // compile lazily, because "host"-containing variables can change on tlds update.
+        self.re.no_http =  new RegExp(
+          '^' +
+          self.re.src_auth +
+          // Don't allow single-level domains, because of false positives like '//test'
+          // with code comments
+          '(?:localhost|(?:(?:' + self.re.src_domain + ')\\.)+' + self.re.src_domain_root + ')' +
+          self.re.src_port +
+          self.re.src_host_terminator +
+          self.re.src_path,
+
+          'i'
+        );
+      }
+
+      if (self.re.no_http.test(tail)) {
+        // should not be `://` & `///`, that protects from errors in protocol name
+        if (pos >= 3 && text[pos - 3] === ':') { return 0; }
+        if (pos >= 3 && text[pos - 3] === '/') { return 0; }
+        return tail.match(self.re.no_http)[0].length;
+      }
+      return 0;
+    }
+  },
+  'mailto:': {
+    validate: function (text, pos, self) {
+      var tail = text.slice(pos);
+
+      if (!self.re.mailto) {
+        self.re.mailto =  new RegExp(
+          '^' + self.re.src_email_name + '@' + self.re.src_host_strict, 'i'
+        );
+      }
+      if (self.re.mailto.test(tail)) {
+        return tail.match(self.re.mailto)[0].length;
+      }
+      return 0;
+    }
+  }
+};
+
+/*eslint-disable max-len*/
+
+// RE pattern for 2-character tlds (autogenerated by ./support/tlds_2char_gen.js)
+var tlds_2ch_src_re = 'a[cdefgilmnoqrstuwxz]|b[abdefghijmnorstvwyz]|c[acdfghiklmnoruvwxyz]|d[ejkmoz]|e[cegrstu]|f[ijkmor]|g[abdefghilmnpqrstuwy]|h[kmnrtu]|i[delmnoqrst]|j[emop]|k[eghimnprwyz]|l[abcikrstuvy]|m[acdeghklmnopqrstuvwxyz]|n[acefgilopruz]|om|p[aefghklmnrstwy]|qa|r[eosuw]|s[abcdeghijklmnortuvxyz]|t[cdfghjklmnortvwz]|u[agksyz]|v[aceginu]|w[fs]|y[et]|z[amw]';
+
+// DON'T try to make PRs with changes. Extend TLDs with LinkifyIt.tlds() instead
+var tlds_default = 'biz|com|edu|gov|net|org|pro|web|xxx|aero|asia|coop|info|museum|name|shop|рф'.split('|');
+
+/*eslint-enable max-len*/
+
+////////////////////////////////////////////////////////////////////////////////
+
+function resetScanCache(self) {
+  self.__index__ = -1;
+  self.__text_cache__   = '';
+}
+
+function createValidator(re) {
+  return function (text, pos) {
+    var tail = text.slice(pos);
+
+    if (re.test(tail)) {
+      return tail.match(re)[0].length;
+    }
+    return 0;
+  };
+}
+
+function createNormalizer() {
+  return function (match, self) {
+    self.normalize(match);
+  };
+}
+
+// Schemas compiler. Build regexps.
+//
+function compile(self) {
+
+  // Load & clone RE patterns.
+  var re = self.re = require('./lib/re')(self.__opts__);
+
+  // Define dynamic patterns
+  var tlds = self.__tlds__.slice();
+
+  self.onCompile();
+
+  if (!self.__tlds_replaced__) {
+    tlds.push(tlds_2ch_src_re);
+  }
+  tlds.push(re.src_xn);
+
+  re.src_tlds = tlds.join('|');
+
+  function untpl(tpl) { return tpl.replace('%TLDS%', re.src_tlds); }
+
+  re.email_fuzzy      = RegExp(untpl(re.tpl_email_fuzzy), 'i');
+  re.link_fuzzy       = RegExp(untpl(re.tpl_link_fuzzy), 'i');
+  re.link_no_ip_fuzzy = RegExp(untpl(re.tpl_link_no_ip_fuzzy), 'i');
+  re.host_fuzzy_test  = RegExp(untpl(re.tpl_host_fuzzy_test), 'i');
+
+  //
+  // Compile each schema
+  //
+
+  var aliases = [];
+
+  self.__compiled__ = {}; // Reset compiled data
+
+  function schemaError(name, val) {
+    throw new Error('(LinkifyIt) Invalid schema "' + name + '": ' + val);
+  }
+
+  Object.keys(self.__schemas__).forEach(function (name) {
+    var val = self.__schemas__[name];
+
+    // skip disabled methods
+    if (val === null) { return; }
+
+    var compiled = { validate: null, link: null };
+
+    self.__compiled__[name] = compiled;
+
+    if (isObject(val)) {
+      if (isRegExp(val.validate)) {
+        compiled.validate = createValidator(val.validate);
+      } else if (isFunction(val.validate)) {
+        compiled.validate = val.validate;
+      } else {
+        schemaError(name, val);
+      }
+
+      if (isFunction(val.normalize)) {
+        compiled.normalize = val.normalize;
+      } else if (!val.normalize) {
+        compiled.normalize = createNormalizer();
+      } else {
+        schemaError(name, val);
+      }
+
+      return;
+    }
+
+    if (isString(val)) {
+      aliases.push(name);
+      return;
+    }
+
+    schemaError(name, val);
+  });
+
+  //
+  // Compile postponed aliases
+  //
+
+  aliases.forEach(function (alias) {
+    if (!self.__compiled__[self.__schemas__[alias]]) {
+      // Silently fail on missed schemas to avoid errons on disable.
+      // schemaError(alias, self.__schemas__[alias]);
+      return;
+    }
+
+    self.__compiled__[alias].validate =
+      self.__compiled__[self.__schemas__[alias]].validate;
+    self.__compiled__[alias].normalize =
+      self.__compiled__[self.__schemas__[alias]].normalize;
+  });
+
+  //
+  // Fake record for guessed links
+  //
+  self.__compiled__[''] = { validate: null, normalize: createNormalizer() };
+
+  //
+  // Build schema condition
+  //
+  var slist = Object.keys(self.__compiled__)
+                      .filter(function (name) {
+                        // Filter disabled & fake schemas
+                        return name.length > 0 && self.__compiled__[name];
+                      })
+                      .map(escapeRE)
+                      .join('|');
+  // (?!_) cause 1.5x slowdown
+  self.re.schema_test   = RegExp('(^|(?!_)(?:[><\uff5c]|' + re.src_ZPCc + '))(' + slist + ')', 'i');
+  self.re.schema_search = RegExp('(^|(?!_)(?:[><\uff5c]|' + re.src_ZPCc + '))(' + slist + ')', 'ig');
+
+  self.re.pretest = RegExp(
+    '(' + self.re.schema_test.source + ')|(' + self.re.host_fuzzy_test.source + ')|@',
+    'i'
+  );
+
+  //
+  // Cleanup
+  //
+
+  resetScanCache(self);
+}
+
+/**
+ * class Match
+ *
+ * Match result. Single element of array, returned by [[LinkifyIt#match]]
+ **/
+function Match(self, shift) {
+  var start = self.__index__,
+      end   = self.__last_index__,
+      text  = self.__text_cache__.slice(start, end);
+
+  /**
+   * Match#schema -> String
+   *
+   * Prefix (protocol) for matched string.
+   **/
+  this.schema    = self.__schema__.toLowerCase();
+  /**
+   * Match#index -> Number
+   *
+   * First position of matched string.
+   **/
+  this.index     = start + shift;
+  /**
+   * Match#lastIndex -> Number
+   *
+   * Next position after matched string.
+   **/
+  this.lastIndex = end + shift;
+  /**
+   * Match#raw -> String
+   *
+   * Matched string.
+   **/
+  this.raw       = text;
+  /**
+   * Match#text -> String
+   *
+   * Notmalized text of matched string.
+   **/
+  this.text      = text;
+  /**
+   * Match#url -> String
+   *
+   * Normalized url of matched string.
+   **/
+  this.url       = text;
+}
+
+function createMatch(self, shift) {
+  var match = new Match(self, shift);
+
+  self.__compiled__[match.schema].normalize(match, self);
+
+  return match;
+}
+
+
+/**
+ * class LinkifyIt
+ **/
+
+/**
+ * new LinkifyIt(schemas, options)
+ * - schemas (Object): Optional. Additional schemas to validate (prefix/validator)
+ * - options (Object): { fuzzyLink|fuzzyEmail|fuzzyIP: true|false }
+ *
+ * Creates new linkifier instance with optional additional schemas.
+ * Can be called without `new` keyword for convenience.
+ *
+ * By default understands:
+ *
+ * - `http(s)://...` , `ftp://...`, `mailto:...` & `//...` links
+ * - "fuzzy" links and emails (example.com, foo@bar.com).
+ *
+ * `schemas` is an object, where each key/value describes protocol/rule:
+ *
+ * - __key__ - link prefix (usually, protocol name with `:` at the end, `skype:`
+ *   for example). `linkify-it` makes shure that prefix is not preceeded with
+ *   alphanumeric char and symbols. Only whitespaces and punctuation allowed.
+ * - __value__ - rule to check tail after link prefix
+ *   - _String_ - just alias to existing rule
+ *   - _Object_
+ *     - _validate_ - validator function (should return matched length on success),
+ *       or `RegExp`.
+ *     - _normalize_ - optional function to normalize text & url of matched result
+ *       (for example, for @twitter mentions).
+ *
+ * `options`:
+ *
+ * - __fuzzyLink__ - recognige URL-s without `http(s):` prefix. Default `true`.
+ * - __fuzzyIP__ - allow IPs in fuzzy links above. Can conflict with some texts
+ *   like version numbers. Default `false`.
+ * - __fuzzyEmail__ - recognize emails without `mailto:` prefix.
+ *
+ **/
+function LinkifyIt(schemas, options) {
+  if (!(this instanceof LinkifyIt)) {
+    return new LinkifyIt(schemas, options);
+  }
+
+  if (!options) {
+    if (isOptionsObj(schemas)) {
+      options = schemas;
+      schemas = {};
+    }
+  }
+
+  this.__opts__           = assign({}, defaultOptions, options);
+
+  // Cache last tested result. Used to skip repeating steps on next `match` call.
+  this.__index__          = -1;
+  this.__last_index__     = -1; // Next scan position
+  this.__schema__         = '';
+  this.__text_cache__     = '';
+
+  this.__schemas__        = assign({}, defaultSchemas, schemas);
+  this.__compiled__       = {};
+
+  this.__tlds__           = tlds_default;
+  this.__tlds_replaced__  = false;
+
+  this.re = {};
+
+  compile(this);
+}
+
+
+/** chainable
+ * LinkifyIt#add(schema, definition)
+ * - schema (String): rule name (fixed pattern prefix)
+ * - definition (String|RegExp|Object): schema definition
+ *
+ * Add new rule definition. See constructor description for details.
+ **/
+LinkifyIt.prototype.add = function add(schema, definition) {
+  this.__schemas__[schema] = definition;
+  compile(this);
+  return this;
+};
+
+
+/** chainable
+ * LinkifyIt#set(options)
+ * - options (Object): { fuzzyLink|fuzzyEmail|fuzzyIP: true|false }
+ *
+ * Set recognition options for links without schema.
+ **/
+LinkifyIt.prototype.set = function set(options) {
+  this.__opts__ = assign(this.__opts__, options);
+  return this;
+};
+
+
+/**
+ * LinkifyIt#test(text) -> Boolean
+ *
+ * Searches linkifiable pattern and returns `true` on success or `false` on fail.
+ **/
+LinkifyIt.prototype.test = function test(text) {
+  // Reset scan cache
+  this.__text_cache__ = text;
+  this.__index__      = -1;
+
+  if (!text.length) { return false; }
+
+  var m, ml, me, len, shift, next, re, tld_pos, at_pos;
+
+  // try to scan for link with schema - that's the most simple rule
+  if (this.re.schema_test.test(text)) {
+    re = this.re.schema_search;
+    re.lastIndex = 0;
+    while ((m = re.exec(text)) !== null) {
+      len = this.testSchemaAt(text, m[2], re.lastIndex);
+      if (len) {
+        this.__schema__     = m[2];
+        this.__index__      = m.index + m[1].length;
+        this.__last_index__ = m.index + m[0].length + len;
+        break;
+      }
+    }
+  }
+
+  if (this.__opts__.fuzzyLink && this.__compiled__['http:']) {
+    // guess schemaless links
+    tld_pos = text.search(this.re.host_fuzzy_test);
+    if (tld_pos >= 0) {
+      // if tld is located after found link - no need to check fuzzy pattern
+      if (this.__index__ < 0 || tld_pos < this.__index__) {
+        if ((ml = text.match(this.__opts__.fuzzyIP ? this.re.link_fuzzy : this.re.link_no_ip_fuzzy)) !== null) {
+
+          shift = ml.index + ml[1].length;
+
+          if (this.__index__ < 0 || shift < this.__index__) {
+            this.__schema__     = '';
+            this.__index__      = shift;
+            this.__last_index__ = ml.index + ml[0].length;
+          }
+        }
+      }
+    }
+  }
+
+  if (this.__opts__.fuzzyEmail && this.__compiled__['mailto:']) {
+    // guess schemaless emails
+    at_pos = text.indexOf('@');
+    if (at_pos >= 0) {
+      // We can't skip this check, because this cases are possible:
+      // 192.168.1.1@gmail.com, my.in@example.com
+      if ((me = text.match(this.re.email_fuzzy)) !== null) {
+
+        shift = me.index + me[1].length;
+        next  = me.index + me[0].length;
+
+        if (this.__index__ < 0 || shift < this.__index__ ||
+            (shift === this.__index__ && next > this.__last_index__)) {
+          this.__schema__     = 'mailto:';
+          this.__index__      = shift;
+          this.__last_index__ = next;
+        }
+      }
+    }
+  }
+
+  return this.__index__ >= 0;
+};
+
+
+/**
+ * LinkifyIt#pretest(text) -> Boolean
+ *
+ * Very quick check, that can give false positives. Returns true if link MAY BE
+ * can exists. Can be used for speed optimization, when you need to check that
+ * link NOT exists.
+ **/
+LinkifyIt.prototype.pretest = function pretest(text) {
+  return this.re.pretest.test(text);
+};
+
+
+/**
+ * LinkifyIt#testSchemaAt(text, name, position) -> Number
+ * - text (String): text to scan
+ * - name (String): rule (schema) name
+ * - position (Number): text offset to check from
+ *
+ * Similar to [[LinkifyIt#test]] but checks only specific protocol tail exactly
+ * at given position. Returns length of found pattern (0 on fail).
+ **/
+LinkifyIt.prototype.testSchemaAt = function testSchemaAt(text, schema, pos) {
+  // If not supported schema check requested - terminate
+  if (!this.__compiled__[schema.toLowerCase()]) {
+    return 0;
+  }
+  return this.__compiled__[schema.toLowerCase()].validate(text, pos, this);
+};
+
+
+/**
+ * LinkifyIt#match(text) -> Array|null
+ *
+ * Returns array of found link descriptions or `null` on fail. We strongly
+ * recommend to use [[LinkifyIt#test]] first, for best speed.
+ *
+ * ##### Result match description
+ *
+ * - __schema__ - link schema, can be empty for fuzzy links, or `//` for
+ *   protocol-neutral  links.
+ * - __index__ - offset of matched text
+ * - __lastIndex__ - index of next char after mathch end
+ * - __raw__ - matched text
+ * - __text__ - normalized text
+ * - __url__ - link, generated from matched text
+ **/
+LinkifyIt.prototype.match = function match(text) {
+  var shift = 0, result = [];
+
+  // Try to take previous element from cache, if .test() called before
+  if (this.__index__ >= 0 && this.__text_cache__ === text) {
+    result.push(createMatch(this, shift));
+    shift = this.__last_index__;
+  }
+
+  // Cut head if cache was used
+  var tail = shift ? text.slice(shift) : text;
+
+  // Scan string until end reached
+  while (this.test(tail)) {
+    result.push(createMatch(this, shift));
+
+    tail = tail.slice(this.__last_index__);
+    shift += this.__last_index__;
+  }
+
+  if (result.length) {
+    return result;
+  }
+
+  return null;
+};
+
+
+/** chainable
+ * LinkifyIt#tlds(list [, keepOld]) -> this
+ * - list (Array): list of tlds
+ * - keepOld (Boolean): merge with current list if `true` (`false` by default)
+ *
+ * Load (or merge) new tlds list. Those are user for fuzzy links (without prefix)
+ * to avoid false positives. By default this algorythm used:
+ *
+ * - hostname with any 2-letter root zones are ok.
+ * - biz|com|edu|gov|net|org|pro|web|xxx|aero|asia|coop|info|museum|name|shop|рф
+ *   are ok.
+ * - encoded (`xn--...`) root zones are ok.
+ *
+ * If list is replaced, then exact match for 2-chars root zones will be checked.
+ **/
+LinkifyIt.prototype.tlds = function tlds(list, keepOld) {
+  list = Array.isArray(list) ? list : [ list ];
+
+  if (!keepOld) {
+    this.__tlds__ = list.slice();
+    this.__tlds_replaced__ = true;
+    compile(this);
+    return this;
+  }
+
+  this.__tlds__ = this.__tlds__.concat(list)
+                                  .sort()
+                                  .filter(function (el, idx, arr) {
+                                    return el !== arr[idx - 1];
+                                  })
+                                  .reverse();
+
+  compile(this);
+  return this;
+};
+
+/**
+ * LinkifyIt#normalize(match)
+ *
+ * Default normalizer (if schema does not define it's own).
+ **/
+LinkifyIt.prototype.normalize = function normalize(match) {
+
+  // Do minimal possible changes by default. Need to collect feedback prior
+  // to move forward https://github.com/markdown-it/linkify-it/issues/1
+
+  if (!match.schema) { match.url = 'http://' + match.url; }
+
+  if (match.schema === 'mailto:' && !/^mailto:/i.test(match.url)) {
+    match.url = 'mailto:' + match.url;
+  }
+};
+
+
+/**
+ * LinkifyIt#onCompile()
+ *
+ * Override to modify basic RegExp-s.
+ **/
+LinkifyIt.prototype.onCompile = function onCompile() {
+};
+
+
+module.exports = LinkifyIt;