fuse.basic.common.js

/**
 * Fuse.js v6.4.1 - Lightweight fuzzy-search (http://fusejs.io)
 *
 * Copyright (c) 2020 Kiro Risk (http://kiro.me)
 * All Rights Reserved. Apache Software License 2.0
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 */

'use strict';

function _typeof(obj) {
  "@babel/helpers - typeof";

  if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") {
    _typeof = function (obj) {
      return typeof obj;
    };
  } else {
    _typeof = function (obj) {
      return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
    };
  }

  return _typeof(obj);
}

function _classCallCheck(instance, Constructor) {
  if (!(instance instanceof Constructor)) {
    throw new TypeError("Cannot call a class as a function");
  }
}

function _defineProperties(target, props) {
  for (var i = 0; i < props.length; i++) {
    var descriptor = props[i];
    descriptor.enumerable = descriptor.enumerable || false;
    descriptor.configurable = true;
    if ("value" in descriptor) descriptor.writable = true;
    Object.defineProperty(target, descriptor.key, descriptor);
  }
}

function _createClass(Constructor, protoProps, staticProps) {
  if (protoProps) _defineProperties(Constructor.prototype, protoProps);
  if (staticProps) _defineProperties(Constructor, staticProps);
  return Constructor;
}

function _defineProperty(obj, key, value) {
  if (key in obj) {
    Object.defineProperty(obj, key, {
      value: value,
      enumerable: true,
      configurable: true,
      writable: true
    });
  } else {
    obj[key] = value;
  }

  return obj;
}

function ownKeys(object, enumerableOnly) {
  var keys = Object.keys(object);

  if (Object.getOwnPropertySymbols) {
    var symbols = Object.getOwnPropertySymbols(object);
    if (enumerableOnly) symbols = symbols.filter(function (sym) {
      return Object.getOwnPropertyDescriptor(object, sym).enumerable;
    });
    keys.push.apply(keys, symbols);
  }

  return keys;
}

function _objectSpread2(target) {
  for (var i = 1; i < arguments.length; i++) {
    var source = arguments[i] != null ? arguments[i] : {};

    if (i % 2) {
      ownKeys(Object(source), true).forEach(function (key) {
        _defineProperty(target, key, source[key]);
      });
    } else if (Object.getOwnPropertyDescriptors) {
      Object.defineProperties(target, Object.getOwnPropertyDescriptors(source));
    } else {
      ownKeys(Object(source)).forEach(function (key) {
        Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key));
      });
    }
  }

  return target;
}

function _toConsumableArray(arr) {
  return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _unsupportedIterableToArray(arr) || _nonIterableSpread();
}

function _arrayWithoutHoles(arr) {
  if (Array.isArray(arr)) return _arrayLikeToArray(arr);
}

function _iterableToArray(iter) {
  if (typeof Symbol !== "undefined" && Symbol.iterator in Object(iter)) return Array.from(iter);
}

function _unsupportedIterableToArray(o, minLen) {
  if (!o) return;
  if (typeof o === "string") return _arrayLikeToArray(o, minLen);
  var n = Object.prototype.toString.call(o).slice(8, -1);
  if (n === "Object" && o.constructor) n = o.constructor.name;
  if (n === "Map" || n === "Set") return Array.from(o);
  if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen);
}

function _arrayLikeToArray(arr, len) {
  if (len == null || len > arr.length) len = arr.length;

  for (var i = 0, arr2 = new Array(len); i < len; i++) arr2[i] = arr[i];

  return arr2;
}

function _nonIterableSpread() {
  throw new TypeError("Invalid attempt to spread non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
}

function isArray(value) {
  return !Array.isArray ? getTag(value) === '[object Array]' : Array.isArray(value);
} // Adapted from: https://github.com/lodash/lodash/blob/master/.internal/baseToString.js

var INFINITY = 1 / 0;
function baseToString(value) {
  // Exit early for strings to avoid a performance hit in some environments.
  if (typeof value == 'string') {
    return value;
  }

  var result = value + '';
  return result == '0' && 1 / value == -INFINITY ? '-0' : result;
}
function toString(value) {
  return value == null ? '' : baseToString(value);
}
function isString(value) {
  return typeof value === 'string';
}
function isNumber(value) {
  return typeof value === 'number';
} // Adapted from: https://github.com/lodash/lodash/blob/master/isBoolean.js

function isBoolean(value) {
  return value === true || value === false || isObjectLike(value) && getTag(value) == '[object Boolean]';
}
function isObject(value) {
  return _typeof(value) === 'object';
} // Checks if `value` is object-like.

function isObjectLike(value) {
  return isObject(value) && value !== null;
}
function isDefined(value) {
  return value !== undefined && value !== null;
}
function isBlank(value) {
  return !value.trim().length;
} // Gets the `toStringTag` of `value`.
// Adapted from: https://github.com/lodash/lodash/blob/master/.internal/getTag.js

function getTag(value) {
  return value == null ? value === undefined ? '[object Undefined]' : '[object Null]' : Object.prototype.toString.call(value);
}

var EXTENDED_SEARCH_UNAVAILABLE = 'Extended search is not available';
var LOGICAL_SEARCH_UNAVAILABLE = 'Logical search is not available';
var INCORRECT_INDEX_TYPE = "Incorrect 'index' type";
var LOGICAL_SEARCH_INVALID_QUERY_FOR_KEY = function LOGICAL_SEARCH_INVALID_QUERY_FOR_KEY(key) {
  return "Invalid value for key ".concat(key);
};
var PATTERN_LENGTH_TOO_LARGE = function PATTERN_LENGTH_TOO_LARGE(max) {
  return "Pattern length exceeds max of ".concat(max, ".");
};
var MISSING_KEY_PROPERTY = function MISSING_KEY_PROPERTY(name) {
  return "Missing ".concat(name, " property in key");
};
var INVALID_KEY_WEIGHT_VALUE = function INVALID_KEY_WEIGHT_VALUE(key) {
  return "Property 'weight' in key '".concat(key, "' must be a positive integer");
};

var hasOwn = Object.prototype.hasOwnProperty;

var KeyStore = /*#__PURE__*/function () {
  function KeyStore(keys) {
    var _this = this;

    _classCallCheck(this, KeyStore);

    this._keys = [];
    this._keyMap = {};
    var totalWeight = 0;
    keys.forEach(function (key) {
      var obj = createKey(key);
      totalWeight += obj.weight;

      _this._keys.push(obj);

      _this._keyMap[obj.id] = obj;
      totalWeight += obj.weight;
    }); // Normalize weights so that their sum is equal to 1

    this._keys.forEach(function (key) {
      key.weight /= totalWeight;
    });
  }

  _createClass(KeyStore, [{
    key: "get",
    value: function get(keyId) {
      return this._keyMap[keyId];
    }
  }, {
    key: "keys",
    value: function keys() {
      return this._keys;
    }
  }, {
    key: "toJSON",
    value: function toJSON() {
      return JSON.stringify(this._keys);
    }
  }]);

  return KeyStore;
}();
function createKey(key) {
  var path = null;
  var id = null;
  var src = null;
  var weight = 1;

  if (isString(key) || isArray(key)) {
    src = key;
    path = createKeyPath(key);
    id = createKeyId(key);
  } else {
    if (!hasOwn.call(key, 'name')) {
      throw new Error(MISSING_KEY_PROPERTY('name'));
    }

    var name = key.name;
    src = name;

    if (hasOwn.call(key, 'weight')) {
      weight = key.weight;

      if (weight <= 0) {
        throw new Error(INVALID_KEY_WEIGHT_VALUE(name));
      }
    }

    path = createKeyPath(name);
    id = createKeyId(name);
  }

  return {
    path: path,
    id: id,
    weight: weight,
    src: src
  };
}
function createKeyPath(key) {
  return isArray(key) ? key : key.split('.');
}
function createKeyId(key) {
  return isArray(key) ? key.join('.') : key;
}

function get(obj, path) {
  var list = [];
  var arr = false;

  var deepGet = function deepGet(obj, path, index) {
    if (!path[index]) {
      // If there's no path left, we've arrived at the object we care about.
      list.push(obj);
    } else {
      var key = path[index];
      var value = obj[key];

      if (!isDefined(value)) {
        return;
      } // If we're at the last value in the path, and if it's a string/number/bool,
      // add it to the list


      if (index === path.length - 1 && (isString(value) || isNumber(value) || isBoolean(value))) {
        list.push(toString(value));
      } else if (isArray(value)) {
        arr = true; // Search each item in the array.

        for (var i = 0, len = value.length; i < len; i += 1) {
          deepGet(value[i], path, index + 1);
        }
      } else if (path.length) {
        // An object. Recurse further.
        deepGet(value, path, index + 1);
      }
    }
  }; // Backwards compatibility (since path used to be a string)


  deepGet(obj, isString(path) ? path.split('.') : path, 0);
  return arr ? list : list[0];
}

var MatchOptions = {
  // Whether the matches should be included in the result set. When `true`, each record in the result
  // set will include the indices of the matched characters.
  // These can consequently be used for highlighting purposes.
  includeMatches: false,
  // When `true`, the matching function will continue to the end of a search pattern even if
  // a perfect match has already been located in the string.
  findAllMatches: false,
  // Minimum number of characters that must be matched before a result is considered a match
  minMatchCharLength: 1
};
var BasicOptions = {
  // When `true`, the algorithm continues searching to the end of the input even if a perfect
  // match is found before the end of the same input.
  isCaseSensitive: false,
  // When true, the matching function will continue to the end of a search pattern even if
  includeScore: false,
  // List of properties that will be searched. This also supports nested properties.
  keys: [],
  // Whether to sort the result list, by score
  shouldSort: true,
  // Default sort function: sort by ascending score, ascending index
  sortFn: function sortFn(a, b) {
    return a.score === b.score ? a.idx < b.idx ? -1 : 1 : a.score < b.score ? -1 : 1;
  }
};
var FuzzyOptions = {
  // Approximately where in the text is the pattern expected to be found?
  location: 0,
  // At what point does the match algorithm give up. A threshold of '0.0' requires a perfect match
  // (of both letters and location), a threshold of '1.0' would match anything.
  threshold: 0.6,
  // Determines how close the match must be to the fuzzy location (specified above).
  // An exact letter match which is 'distance' characters away from the fuzzy location
  // would score as a complete mismatch. A distance of '0' requires the match be at
  // the exact location specified, a threshold of '1000' would require a perfect match
  // to be within 800 characters of the fuzzy location to be found using a 0.8 threshold.
  distance: 100
};
var AdvancedOptions = {
  // When `true`, it enables the use of unix-like search commands
  useExtendedSearch: false,
  // The get function to use when fetching an object's properties.
  // The default will search nested paths *ie foo.bar.baz*
  getFn: get,
  // When `true`, search will ignore `location` and `distance`, so it won't matter
  // where in the string the pattern appears.
  // More info: https://fusejs.io/concepts/scoring-theory.html#fuzziness-score
  ignoreLocation: false,
  // When `true`, the calculation for the relevance score (used for sorting) will
  // ignore the field-length norm.
  // More info: https://fusejs.io/concepts/scoring-theory.html#field-length-norm
  ignoreFieldNorm: false
};
var Config = _objectSpread2({}, BasicOptions, {}, MatchOptions, {}, FuzzyOptions, {}, AdvancedOptions);

var SPACE = /[^ ]+/g; // Field-length norm: the shorter the field, the higher the weight.
// Set to 3 decimals to reduce index size.

function norm() {
  var mantissa = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 3;
  var cache = new Map();
  return {
    get: function get(value) {
      var numTokens = value.match(SPACE).length;

      if (cache.has(numTokens)) {
        return cache.get(numTokens);
      }

      var n = parseFloat((1 / Math.sqrt(numTokens)).toFixed(mantissa));
      cache.set(numTokens, n);
      return n;
    },
    clear: function clear() {
      cache.clear();
    }
  };
}

var FuseIndex = /*#__PURE__*/function () {
  function FuseIndex() {
    var _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
        _ref$getFn = _ref.getFn,
        getFn = _ref$getFn === void 0 ? Config.getFn : _ref$getFn;

    _classCallCheck(this, FuseIndex);

    this.norm = norm(3);
    this.getFn = getFn;
    this.isCreated = false;
    this.setIndexRecords();
  }

  _createClass(FuseIndex, [{
    key: "setSources",
    value: function setSources() {
      var docs = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : [];
      this.docs = docs;
    }
  }, {
    key: "setIndexRecords",
    value: function setIndexRecords() {
      var records = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : [];
      this.records = records;
    }
  }, {
    key: "setKeys",
    value: function setKeys() {
      var _this = this;

      var keys = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : [];
      this.keys = keys;
      this._keysMap = {};
      keys.forEach(function (key, idx) {
        _this._keysMap[key.id] = idx;
      });
    }
  }, {
    key: "create",
    value: function create() {
      var _this2 = this;

      if (this.isCreated || !this.docs.length) {
        return;
      }

      this.isCreated = true; // List is Array<String>

      if (isString(this.docs[0])) {
        this.docs.forEach(function (doc, docIndex) {
          _this2._addString(doc, docIndex);
        });
      } else {
        // List is Array<Object>
        this.docs.forEach(function (doc, docIndex) {
          _this2._addObject(doc, docIndex);
        });
      }

      this.norm.clear();
    } // Adds a doc to the end of the index

  }, {
    key: "add",
    value: function add(doc) {
      var idx = this.size();

      if (isString(doc)) {
        this._addString(doc, idx);
      } else {
        this._addObject(doc, idx);
      }
    } // Removes the doc at the specified index of the index

  }, {
    key: "removeAt",
    value: function removeAt(idx) {
      this.records.splice(idx, 1); // Change ref index of every subsquent doc

      for (var i = idx, len = this.size(); i < len; i += 1) {
        this.records[i].i -= 1;
      }
    }
  }, {
    key: "getValueForItemAtKeyId",
    value: function getValueForItemAtKeyId(item, keyId) {
      return item[this._keysMap[keyId]];
    }
  }, {
    key: "size",
    value: function size() {
      return this.records.length;
    }
  }, {
    key: "_addString",
    value: function _addString(doc, docIndex) {
      if (!isDefined(doc) || isBlank(doc)) {
        return;
      }

      var record = {
        v: doc,
        i: docIndex,
        n: this.norm.get(doc)
      };
      this.records.push(record);
    }
  }, {
    key: "_addObject",
    value: function _addObject(doc, docIndex) {
      var _this3 = this;

      var record = {
        i: docIndex,
        $: {}
      }; // Iterate over every key (i.e, path), and fetch the value at that key

      this.keys.forEach(function (key, keyIndex) {
        // console.log(key)
        var value = _this3.getFn(doc, key.path);

        if (!isDefined(value)) {
          return;
        }

        if (isArray(value)) {
          (function () {
            var subRecords = [];
            var stack = [{
              nestedArrIndex: -1,
              value: value
            }];

            while (stack.length) {
              var _stack$pop = stack.pop(),
                  nestedArrIndex = _stack$pop.nestedArrIndex,
                  _value = _stack$pop.value;

              if (!isDefined(_value)) {
                continue;
              }

              if (isString(_value) && !isBlank(_value)) {
                var subRecord = {
                  v: _value,
                  i: nestedArrIndex,
                  n: _this3.norm.get(_value)
                };
                subRecords.push(subRecord);
              } else if (isArray(_value)) {
                _value.forEach(function (item, k) {
                  stack.push({
                    nestedArrIndex: k,
                    value: item
                  });
                });
              }
            }

            record.$[keyIndex] = subRecords;
          })();
        } else if (!isBlank(value)) {
          var subRecord = {
            v: value,
            n: _this3.norm.get(value)
          };
          record.$[keyIndex] = subRecord;
        }
      });
      this.records.push(record);
    }
  }, {
    key: "toJSON",
    value: function toJSON() {
      return {
        keys: this.keys,
        records: this.records
      };
    }
  }]);

  return FuseIndex;
}();
function createIndex(keys, docs) {
  var _ref2 = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {},
      _ref2$getFn = _ref2.getFn,
      getFn = _ref2$getFn === void 0 ? Config.getFn : _ref2$getFn;

  var myIndex = new FuseIndex({
    getFn: getFn
  });
  myIndex.setKeys(keys.map(createKey));
  myIndex.setSources(docs);
  myIndex.create();
  return myIndex;
}
function parseIndex(data) {
  var _ref3 = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {},
      _ref3$getFn = _ref3.getFn,
      getFn = _ref3$getFn === void 0 ? Config.getFn : _ref3$getFn;

  var keys = data.keys,
      records = data.records;
  var myIndex = new FuseIndex({
    getFn: getFn
  });
  myIndex.setKeys(keys);
  myIndex.setIndexRecords(records);
  return myIndex;
}

function transformMatches(result, data) {
  var matches = result.matches;
  data.matches = [];

  if (!isDefined(matches)) {
    return;
  }

  matches.forEach(function (match) {
    if (!isDefined(match.indices) || !match.indices.length) {
      return;
    }

    var indices = match.indices,
        value = match.value;
    var obj = {
      indices: indices,
      value: value
    };

    if (match.key) {
      obj.key = match.key.src;
    }

    if (match.idx > -1) {
      obj.refIndex = match.idx;
    }

    data.matches.push(obj);
  });
}

function transformScore(result, data) {
  data.score = result.score;
}

function computeScore(pattern) {
  var _ref = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {},
      _ref$errors = _ref.errors,
      errors = _ref$errors === void 0 ? 0 : _ref$errors,
      _ref$currentLocation = _ref.currentLocation,
      currentLocation = _ref$currentLocation === void 0 ? 0 : _ref$currentLocation,
      _ref$expectedLocation = _ref.expectedLocation,
      expectedLocation = _ref$expectedLocation === void 0 ? 0 : _ref$expectedLocation,
      _ref$distance = _ref.distance,
      distance = _ref$distance === void 0 ? Config.distance : _ref$distance,
      _ref$ignoreLocation = _ref.ignoreLocation,
      ignoreLocation = _ref$ignoreLocation === void 0 ? Config.ignoreLocation : _ref$ignoreLocation;

  var accuracy = errors / pattern.length;

  if (ignoreLocation) {
    return accuracy;
  }

  var proximity = Math.abs(expectedLocation - currentLocation);

  if (!distance) {
    // Dodge divide by zero error.
    return proximity ? 1.0 : accuracy;
  }

  return accuracy + proximity / distance;
}

function convertMaskToIndices() {
  var matchmask = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : [];
  var minMatchCharLength = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : Config.minMatchCharLength;
  var indices = [];
  var start = -1;
  var end = -1;
  var i = 0;

  for (var len = matchmask.length; i < len; i += 1) {
    var match = matchmask[i];

    if (match && start === -1) {
      start = i;
    } else if (!match && start !== -1) {
      end = i - 1;

      if (end - start + 1 >= minMatchCharLength) {
        indices.push([start, end]);
      }

      start = -1;
    }
  } // (i-1 - start) + 1 => i - start


  if (matchmask[i - 1] && i - start >= minMatchCharLength) {
    indices.push([start, i - 1]);
  }

  return indices;
}

// Machine word size
var MAX_BITS = 32;

function search(text, pattern, patternAlphabet) {
  var _ref = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {},
      _ref$location = _ref.location,
      location = _ref$location === void 0 ? Config.location : _ref$location,
      _ref$distance = _ref.distance,
      distance = _ref$distance === void 0 ? Config.distance : _ref$distance,
      _ref$threshold = _ref.threshold,
      threshold = _ref$threshold === void 0 ? Config.threshold : _ref$threshold,
      _ref$findAllMatches = _ref.findAllMatches,
      findAllMatches = _ref$findAllMatches === void 0 ? Config.findAllMatches : _ref$findAllMatches,
      _ref$minMatchCharLeng = _ref.minMatchCharLength,
      minMatchCharLength = _ref$minMatchCharLeng === void 0 ? Config.minMatchCharLength : _ref$minMatchCharLeng,
      _ref$includeMatches = _ref.includeMatches,
      includeMatches = _ref$includeMatches === void 0 ? Config.includeMatches : _ref$includeMatches,
      _ref$ignoreLocation = _ref.ignoreLocation,
      ignoreLocation = _ref$ignoreLocation === void 0 ? Config.ignoreLocation : _ref$ignoreLocation;

  if (pattern.length > MAX_BITS) {
    throw new Error(PATTERN_LENGTH_TOO_LARGE(MAX_BITS));
  }

  var patternLen = pattern.length; // Set starting location at beginning text and initialize the alphabet.

  var textLen = text.length; // Handle the case when location > text.length

  var expectedLocation = Math.max(0, Math.min(location, textLen)); // Highest score beyond which we give up.

  var currentThreshold = threshold; // Is there a nearby exact match? (speedup)

  var bestLocation = expectedLocation; // Performance: only computer matches when the minMatchCharLength > 1
  // OR if `includeMatches` is true.

  var computeMatches = minMatchCharLength > 1 || includeMatches; // A mask of the matches, used for building the indices

  var matchMask = computeMatches ? Array(textLen) : [];
  var index; // Get all exact matches, here for speed up

  while ((index = text.indexOf(pattern, bestLocation)) > -1) {
    var score = computeScore(pattern, {
      currentLocation: index,
      expectedLocation: expectedLocation,
      distance: distance,
      ignoreLocation: ignoreLocation
    });
    currentThreshold = Math.min(score, currentThreshold);
    bestLocation = index + patternLen;

    if (computeMatches) {
      var i = 0;

      while (i < patternLen) {
        matchMask[index + i] = 1;
        i += 1;
      }
    }
  } // Reset the best location


  bestLocation = -1;
  var lastBitArr = [];
  var finalScore = 1;
  var binMax = patternLen + textLen;
  var mask = 1 << patternLen - 1;

  for (var _i = 0; _i < patternLen; _i += 1) {
    // Scan for the best match; each iteration allows for one more error.
    // Run a binary search to determine how far from the match location we can stray
    // at this error level.
    var binMin = 0;
    var binMid = binMax;

    while (binMin < binMid) {
      var _score2 = computeScore(pattern, {
        errors: _i,
        currentLocation: expectedLocation + binMid,
        expectedLocation: expectedLocation,
        distance: distance,
        ignoreLocation: ignoreLocation
      });

      if (_score2 <= currentThreshold) {
        binMin = binMid;
      } else {
        binMax = binMid;
      }

      binMid = Math.floor((binMax - binMin) / 2 + binMin);
    } // Use the result from this iteration as the maximum for the next.


    binMax = binMid;
    var start = Math.max(1, expectedLocation - binMid + 1);
    var finish = findAllMatches ? textLen : Math.min(expectedLocation + binMid, textLen) + patternLen; // Initialize the bit array

    var bitArr = Array(finish + 2);
    bitArr[finish + 1] = (1 << _i) - 1;

    for (var j = finish; j >= start; j -= 1) {
      var currentLocation = j - 1;
      var charMatch = patternAlphabet[text.charAt(currentLocation)];

      if (computeMatches) {
        // Speed up: quick bool to int conversion (i.e, `charMatch ? 1 : 0`)
        matchMask[currentLocation] = +!!charMatch;
      } // First pass: exact match


      bitArr[j] = (bitArr[j + 1] << 1 | 1) & charMatch; // Subsequent passes: fuzzy match

      if (_i) {
        bitArr[j] |= (lastBitArr[j + 1] | lastBitArr[j]) << 1 | 1 | lastBitArr[j + 1];
      }

      if (bitArr[j] & mask) {
        finalScore = computeScore(pattern, {
          errors: _i,
          currentLocation: currentLocation,
          expectedLocation: expectedLocation,
          distance: distance,
          ignoreLocation: ignoreLocation
        }); // This match will almost certainly be better than any existing match.
        // But check anyway.

        if (finalScore <= currentThreshold) {
          // Indeed it is
          currentThreshold = finalScore;
          bestLocation = currentLocation; // Already passed `loc`, downhill from here on in.

          if (bestLocation <= expectedLocation) {
            break;
          } // When passing `bestLocation`, don't exceed our current distance from `expectedLocation`.


          start = Math.max(1, 2 * expectedLocation - bestLocation);
        }
      }
    } // No hope for a (better) match at greater error levels.


    var _score = computeScore(pattern, {
      errors: _i + 1,
      currentLocation: expectedLocation,
      expectedLocation: expectedLocation,
      distance: distance,
      ignoreLocation: ignoreLocation
    });

    if (_score > currentThreshold) {
      break;
    }

    lastBitArr = bitArr;
  }

  var result = {
    isMatch: bestLocation >= 0,
    // Count exact matches (those with a score of 0) to be "almost" exact
    score: Math.max(0.001, finalScore)
  };

  if (computeMatches) {
    var indices = convertMaskToIndices(matchMask, minMatchCharLength);

    if (!indices.length) {
      result.isMatch = false;
    } else if (includeMatches) {
      result.indices = indices;
    }
  }

  return result;
}

function createPatternAlphabet(pattern) {
  var mask = {};

  for (var i = 0, len = pattern.length; i < len; i += 1) {
    var char = pattern.charAt(i);
    mask[char] = (mask[char] || 0) | 1 << len - i - 1;
  }

  return mask;
}

var BitapSearch = /*#__PURE__*/function () {
  function BitapSearch(pattern) {
    var _this = this;

    var _ref = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {},
        _ref$location = _ref.location,
        location = _ref$location === void 0 ? Config.location : _ref$location,
        _ref$threshold = _ref.threshold,
        threshold = _ref$threshold === void 0 ? Config.threshold : _ref$threshold,
        _ref$distance = _ref.distance,
        distance = _ref$distance === void 0 ? Config.distance : _ref$distance,
        _ref$includeMatches = _ref.includeMatches,
        includeMatches = _ref$includeMatches === void 0 ? Config.includeMatches : _ref$includeMatches,
        _ref$findAllMatches = _ref.findAllMatches,
        findAllMatches = _ref$findAllMatches === void 0 ? Config.findAllMatches : _ref$findAllMatches,
        _ref$minMatchCharLeng = _ref.minMatchCharLength,
        minMatchCharLength = _ref$minMatchCharLeng === void 0 ? Config.minMatchCharLength : _ref$minMatchCharLeng,
        _ref$isCaseSensitive = _ref.isCaseSensitive,
        isCaseSensitive = _ref$isCaseSensitive === void 0 ? Config.isCaseSensitive : _ref$isCaseSensitive,
        _ref$ignoreLocation = _ref.ignoreLocation,
        ignoreLocation = _ref$ignoreLocation === void 0 ? Config.ignoreLocation : _ref$ignoreLocation;

    _classCallCheck(this, BitapSearch);

    this.options = {
      location: location,
      threshold: threshold,
      distance: distance,
      includeMatches: includeMatches,
      findAllMatches: findAllMatches,
      minMatchCharLength: minMatchCharLength,
      isCaseSensitive: isCaseSensitive,
      ignoreLocation: ignoreLocation
    };
    this.pattern = isCaseSensitive ? pattern : pattern.toLowerCase();
    this.chunks = [];

    if (!this.pattern.length) {
      return;
    }

    var addChunk = function addChunk(pattern, startIndex) {
      _this.chunks.push({
        pattern: pattern,
        alphabet: createPatternAlphabet(pattern),
        startIndex: startIndex
      });
    };

    var len = this.pattern.length;

    if (len > MAX_BITS) {
      var i = 0;
      var remainder = len % MAX_BITS;
      var end = len - remainder;

      while (i < end) {
        addChunk(this.pattern.substr(i, MAX_BITS), i);
        i += MAX_BITS;
      }

      if (remainder) {
        var startIndex = len - MAX_BITS;
        addChunk(this.pattern.substr(startIndex), startIndex);
      }
    } else {
      addChunk(this.pattern, 0);
    }
  }

  _createClass(BitapSearch, [{
    key: "searchIn",
    value: function searchIn(text) {
      var _this$options = this.options,
          isCaseSensitive = _this$options.isCaseSensitive,
          includeMatches = _this$options.includeMatches;

      if (!isCaseSensitive) {
        text = text.toLowerCase();
      } // Exact match


      if (this.pattern === text) {
        var _result = {
          isMatch: true,
          score: 0
        };

        if (includeMatches) {
          _result.indices = [[0, text.length - 1]];
        }

        return _result;
      } // Otherwise, use Bitap algorithm


      var _this$options2 = this.options,
          location = _this$options2.location,
          distance = _this$options2.distance,
          threshold = _this$options2.threshold,
          findAllMatches = _this$options2.findAllMatches,
          minMatchCharLength = _this$options2.minMatchCharLength,
          ignoreLocation = _this$options2.ignoreLocation;
      var allIndices = [];
      var totalScore = 0;
      var hasMatches = false;
      this.chunks.forEach(function (_ref2) {
        var pattern = _ref2.pattern,
            alphabet = _ref2.alphabet,
            startIndex = _ref2.startIndex;

        var _search = search(text, pattern, alphabet, {
          location: location + startIndex,
          distance: distance,
          threshold: threshold,
          findAllMatches: findAllMatches,
          minMatchCharLength: minMatchCharLength,
          includeMatches: includeMatches,
          ignoreLocation: ignoreLocation
        }),
            isMatch = _search.isMatch,
            score = _search.score,
            indices = _search.indices;

        if (isMatch) {
          hasMatches = true;
        }

        totalScore += score;

        if (isMatch && indices) {
          allIndices = [].concat(_toConsumableArray(allIndices), _toConsumableArray(indices));
        }
      });
      var result = {
        isMatch: hasMatches,
        score: hasMatches ? totalScore / this.chunks.length : 1
      };

      if (hasMatches && includeMatches) {
        result.indices = allIndices;
      }

      return result;
    }
  }]);

  return BitapSearch;
}();

var registeredSearchers = [];
function createSearcher(pattern, options) {
  for (var i = 0, len = registeredSearchers.length; i < len; i += 1) {
    var searcherClass = registeredSearchers[i];

    if (searcherClass.condition(pattern, options)) {
      return new searcherClass(pattern, options);
    }
  }

  return new BitapSearch(pattern, options);
}

var LogicalOperator = {
  AND: '$and',
  OR: '$or'
};
var KeyType = {
  PATH: '$path',
  PATTERN: '$val'
};

var isExpression = function isExpression(query) {
  return !!(query[LogicalOperator.AND] || query[LogicalOperator.OR]);
};

var isPath = function isPath(query) {
  return !!query[KeyType.PATH];
};

var isLeaf = function isLeaf(query) {
  return !isArray(query) && isObject(query) && !isExpression(query);
};

var convertToExplicit = function convertToExplicit(query) {
  return _defineProperty({}, LogicalOperator.AND, Object.keys(query).map(function (key) {
    return _defineProperty({}, key, query[key]);
  }));
}; // When `auto` is `true`, the parse function will infer and initialize and add
// the appropriate `Searcher` instance


function parse(query, options) {
  var _ref3 = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {},
      _ref3$auto = _ref3.auto,
      auto = _ref3$auto === void 0 ? true : _ref3$auto;

  var next = function next(query) {
    var keys = Object.keys(query);
    var isQueryPath = isPath(query);

    if (!isQueryPath && keys.length > 1 && !isExpression(query)) {
      return next(convertToExplicit(query));
    }

    if (isLeaf(query)) {
      var key = isQueryPath ? query[KeyType.PATH] : keys[0];
      var pattern = isQueryPath ? query[KeyType.PATTERN] : query[key];

      if (!isString(pattern)) {
        throw new Error(LOGICAL_SEARCH_INVALID_QUERY_FOR_KEY(key));
      }

      var obj = {
        keyId: createKeyId(key),
        pattern: pattern
      };

      if (auto) {
        obj.searcher = createSearcher(pattern, options);
      }

      return obj;
    }

    var node = {
      children: [],
      operator: keys[0]
    };
    keys.forEach(function (key) {
      var value = query[key];

      if (isArray(value)) {
        value.forEach(function (item) {
          node.children.push(next(item));
        });
      }
    });
    return node;
  };

  if (!isExpression(query)) {
    query = convertToExplicit(query);
  }

  return next(query);
}

var Fuse = /*#__PURE__*/function () {
  function Fuse(docs) {
    var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
    var index = arguments.length > 2 ? arguments[2] : undefined;

    _classCallCheck(this, Fuse);

    this.options = _objectSpread2({}, Config, {}, options);

    if (this.options.useExtendedSearch && !false) {
      throw new Error(EXTENDED_SEARCH_UNAVAILABLE);
    }

    this._keyStore = new KeyStore(this.options.keys);
    this.setCollection(docs, index);
  }

  _createClass(Fuse, [{
    key: "setCollection",
    value: function setCollection(docs, index) {
      this._docs = docs;

      if (index && !(index instanceof FuseIndex)) {
        throw new Error(INCORRECT_INDEX_TYPE);
      }

      this._myIndex = index || createIndex(this.options.keys, this._docs, {
        getFn: this.options.getFn
      });
    }
  }, {
    key: "add",
    value: function add(doc) {
      if (!isDefined(doc)) {
        return;
      }

      this._docs.push(doc);

      this._myIndex.add(doc);
    }
  }, {
    key: "remove",
    value: function remove() {
      var predicate = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : function () {
        return (
          /* doc, idx */
          false
        );
      };
      var results = [];

      for (var i = 0, len = this._docs.length; i < len; i += 1) {
        var doc = this._docs[i];

        if (predicate(doc, i)) {
          this.removeAt(i);
          i -= 1;
          results.push(doc);
        }
      }

      return results;
    }
  }, {
    key: "removeAt",
    value: function removeAt(idx) {
      this._docs.splice(idx, 1);

      this._myIndex.removeAt(idx);
    }
  }, {
    key: "getIndex",
    value: function getIndex() {
      return this._myIndex;
    }
  }, {
    key: "search",
    value: function search(query) {
      var _ref = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {},
          _ref$limit = _ref.limit,
          limit = _ref$limit === void 0 ? -1 : _ref$limit;

      var _this$options = this.options,
          includeMatches = _this$options.includeMatches,
          includeScore = _this$options.includeScore,
          shouldSort = _this$options.shouldSort,
          sortFn = _this$options.sortFn,
          ignoreFieldNorm = _this$options.ignoreFieldNorm;
      var results = isString(query) ? isString(this._docs[0]) ? this._searchStringList(query) : this._searchObjectList(query) : this._searchLogical(query);
      computeScore$1(results, {
        ignoreFieldNorm: ignoreFieldNorm
      });

      if (shouldSort) {
        results.sort(sortFn);
      }

      if (isNumber(limit) && limit > -1) {
        results = results.slice(0, limit);
      }

      return format(results, this._docs, {
        includeMatches: includeMatches,
        includeScore: includeScore
      });
    }
  }, {
    key: "_searchStringList",
    value: function _searchStringList(query) {
      var searcher = createSearcher(query, this.options);
      var records = this._myIndex.records;
      var results = []; // Iterate over every string in the index

      records.forEach(function (_ref2) {
        var text = _ref2.v,
            idx = _ref2.i,
            norm = _ref2.n;

        if (!isDefined(text)) {
          return;
        }

        var _searcher$searchIn = searcher.searchIn(text),
            isMatch = _searcher$searchIn.isMatch,
            score = _searcher$searchIn.score,
            indices = _searcher$searchIn.indices;

        if (isMatch) {
          results.push({
            item: text,
            idx: idx,
            matches: [{
              score: score,
              value: text,
              norm: norm,
              indices: indices
            }]
          });
        }
      });
      return results;
    }
  }, {
    key: "_searchLogical",
    value: function _searchLogical(query) {

      {
        throw new Error(LOGICAL_SEARCH_UNAVAILABLE);
      }
    }
  }, {
    key: "_searchObjectList",
    value: function _searchObjectList(query) {
      var _this2 = this;

      var searcher = createSearcher(query, this.options);
      var _this$_myIndex = this._myIndex,
          keys = _this$_myIndex.keys,
          records = _this$_myIndex.records;
      var results = []; // List is Array<Object>

      records.forEach(function (_ref5) {
        var item = _ref5.$,
            idx = _ref5.i;

        if (!isDefined(item)) {
          return;
        }

        var matches = []; // Iterate over every key (i.e, path), and fetch the value at that key

        keys.forEach(function (key, keyIndex) {
          matches.push.apply(matches, _toConsumableArray(_this2._findMatches({
            key: key,
            value: item[keyIndex],
            searcher: searcher
          })));
        });

        if (matches.length) {
          results.push({
            idx: idx,
            item: item,
            matches: matches
          });
        }
      });
      return results;
    }
  }, {
    key: "_findMatches",
    value: function _findMatches(_ref6) {
      var key = _ref6.key,
          value = _ref6.value,
          searcher = _ref6.searcher;

      if (!isDefined(value)) {
        return [];
      }

      var matches = [];

      if (isArray(value)) {
        value.forEach(function (_ref7) {
          var text = _ref7.v,
              idx = _ref7.i,
              norm = _ref7.n;

          if (!isDefined(text)) {
            return;
          }

          var _searcher$searchIn2 = searcher.searchIn(text),
              isMatch = _searcher$searchIn2.isMatch,
              score = _searcher$searchIn2.score,
              indices = _searcher$searchIn2.indices;

          if (isMatch) {
            matches.push({
              score: score,
              key: key,
              value: text,
              idx: idx,
              norm: norm,
              indices: indices
            });
          }
        });
      } else {
        var text = value.v,
            norm = value.n;

        var _searcher$searchIn3 = searcher.searchIn(text),
            isMatch = _searcher$searchIn3.isMatch,
            score = _searcher$searchIn3.score,
            indices = _searcher$searchIn3.indices;

        if (isMatch) {
          matches.push({
            score: score,
            key: key,
            value: text,
            norm: norm,
            indices: indices
          });
        }
      }

      return matches;
    }
  }]);

  return Fuse;
}(); // Practical scoring function

function computeScore$1(results, _ref8) {
  var _ref8$ignoreFieldNorm = _ref8.ignoreFieldNorm,
      ignoreFieldNorm = _ref8$ignoreFieldNorm === void 0 ? Config.ignoreFieldNorm : _ref8$ignoreFieldNorm;
  results.forEach(function (result) {
    var totalScore = 1;
    result.matches.forEach(function (_ref9) {
      var key = _ref9.key,
          norm = _ref9.norm,
          score = _ref9.score;
      var weight = key ? key.weight : null;
      totalScore *= Math.pow(score === 0 && weight ? Number.EPSILON : score, (weight || 1) * (ignoreFieldNorm ? 1 : norm));
    });
    result.score = totalScore;
  });
}

function format(results, docs) {
  var _ref10 = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {},
      _ref10$includeMatches = _ref10.includeMatches,
      includeMatches = _ref10$includeMatches === void 0 ? Config.includeMatches : _ref10$includeMatches,
      _ref10$includeScore = _ref10.includeScore,
      includeScore = _ref10$includeScore === void 0 ? Config.includeScore : _ref10$includeScore;

  var transformers = [];
  if (includeMatches) transformers.push(transformMatches);
  if (includeScore) transformers.push(transformScore);
  return results.map(function (result) {
    var idx = result.idx;
    var data = {
      item: docs[idx],
      refIndex: idx
    };

    if (transformers.length) {
      transformers.forEach(function (transformer) {
        transformer(result, data);
      });
    }

    return data;
  });
}

Fuse.version = '6.4.1';
Fuse.createIndex = createIndex;
Fuse.parseIndex = parseIndex;
Fuse.config = Config;

{
  Fuse.parseQuery = parse;
}

module.exports = Fuse;