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Viewing file:     match-sorter.cjs.js (14.72 KB)      -rw-r--r--

'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

var _extends = require('@babel/runtime/helpers/extends');
var removeAccents = require('remove-accents');

function _interopDefaultLegacy (e) { return e && typeof e === 'object' && 'default' in e ? e : { 'default': e }; }

var _extends__default = /*#__PURE__*/_interopDefaultLegacy(_extends);
var removeAccents__default = /*#__PURE__*/_interopDefaultLegacy(removeAccents);

var rankings = {
  CASE_SENSITIVE_EQUAL: 9,
  EQUAL: 8,
  STARTS_WITH: 7,
  WORD_STARTS_WITH: 6,
  STRING_CASE: 5,
  STRING_CASE_ACRONYM: 4,
  CONTAINS: 3,
  ACRONYM: 2,
  MATCHES: 1,
  NO_MATCH: 0
};
var caseRankings = {
  CAMEL: 0.8,
  PASCAL: 0.6,
  KEBAB: 0.4,
  SNAKE: 0.2,
  NO_CASE: 0
};
matchSorter.rankings = rankings;
matchSorter.caseRankings = caseRankings;

var defaultBaseSortFn = function (a, b) {
  return String(a.rankedItem).localeCompare(b.rankedItem);
};
/**
 * Takes an array of items and a value and returns a new array with the items that match the given value
 * @param {Array} items - the items to sort
 * @param {String} value - the value to use for ranking
 * @param {Object} options - Some options to configure the sorter
 * @return {Array} - the new sorted array
 */


function matchSorter(items, value, options) {
  if (options === void 0) {
    options = {};
  }

  var _options = options,
      keys = _options.keys,
      _options$threshold = _options.threshold,
      threshold = _options$threshold === void 0 ? rankings.MATCHES : _options$threshold,
      _options$baseSort = _options.baseSort,
      baseSort = _options$baseSort === void 0 ? defaultBaseSortFn : _options$baseSort;
  var matchedItems = items.reduce(reduceItemsToRanked, []);
  return matchedItems.sort(function (a, b) {
    return sortRankedItems(a, b, baseSort);
  }).map(function (_ref) {
    var item = _ref.item;
    return item;
  });

  function reduceItemsToRanked(matches, item, index) {
    var _getHighestRanking = getHighestRanking(item, keys, value, options),
        rankedItem = _getHighestRanking.rankedItem,
        rank = _getHighestRanking.rank,
        keyIndex = _getHighestRanking.keyIndex,
        _getHighestRanking$ke = _getHighestRanking.keyThreshold,
        keyThreshold = _getHighestRanking$ke === void 0 ? threshold : _getHighestRanking$ke;

    if (rank >= keyThreshold) {
      matches.push({
        rankedItem: rankedItem,
        item: item,
        rank: rank,
        index: index,
        keyIndex: keyIndex
      });
    }

    return matches;
  }
}
/**
 * Gets the highest ranking for value for the given item based on its values for the given keys
 * @param {*} item - the item to rank
 * @param {Array} keys - the keys to get values from the item for the ranking
 * @param {String} value - the value to rank against
 * @param {Object} options - options to control the ranking
 * @return {{rank: Number, keyIndex: Number, keyThreshold: Number}} - the highest ranking
 */


function getHighestRanking(item, keys, value, options) {
  if (!keys) {
    return {
      // ends up being duplicate of 'item' in matches but consistent
      rankedItem: item,
      rank: getMatchRanking(item, value, options),
      keyIndex: -1,
      keyThreshold: options.threshold
    };
  }

  var valuesToRank = getAllValuesToRank(item, keys);
  return valuesToRank.reduce(function (_ref2, _ref3, i) {
    var rank = _ref2.rank,
        rankedItem = _ref2.rankedItem,
        keyIndex = _ref2.keyIndex,
        keyThreshold = _ref2.keyThreshold;
    var itemValue = _ref3.itemValue,
        attributes = _ref3.attributes;
    var newRank = getMatchRanking(itemValue, value, options);
    var newRankedItem = rankedItem;
    var minRanking = attributes.minRanking,
        maxRanking = attributes.maxRanking,
        threshold = attributes.threshold;

    if (newRank < minRanking && newRank >= rankings.MATCHES) {
      newRank = minRanking;
    } else if (newRank > maxRanking) {
      newRank = maxRanking;
    }

    if (newRank > rank) {
      rank = newRank;
      keyIndex = i;
      keyThreshold = threshold;
      newRankedItem = itemValue;
    }

    return {
      rankedItem: newRankedItem,
      rank: rank,
      keyIndex: keyIndex,
      keyThreshold: keyThreshold
    };
  }, {
    rank: rankings.NO_MATCH,
    keyIndex: -1,
    keyThreshold: options.threshold
  });
}
/**
 * Gives a rankings score based on how well the two strings match.
 * @param {String} testString - the string to test against
 * @param {String} stringToRank - the string to rank
 * @param {Object} options - options for the match (like keepDiacritics for comparison)
 * @returns {Number} the ranking for how well stringToRank matches testString
 */


function getMatchRanking(testString, stringToRank, options) {
  /* eslint complexity:[2, 12] */
  testString = prepareValueForComparison(testString, options);
  stringToRank = prepareValueForComparison(stringToRank, options); // too long

  if (stringToRank.length > testString.length) {
    return rankings.NO_MATCH;
  } // case sensitive equals


  if (testString === stringToRank) {
    return rankings.CASE_SENSITIVE_EQUAL;
  }

  var caseRank = getCaseRanking(testString);
  var isPartial = isPartialOfCase(testString, stringToRank, caseRank);
  var isCasedAcronym = isCaseAcronym(testString, stringToRank, caseRank); // Lower casing before further comparison

  testString = testString.toLowerCase();
  stringToRank = stringToRank.toLowerCase(); // case insensitive equals

  if (testString === stringToRank) {
    return rankings.EQUAL + caseRank;
  } // starts with


  if (testString.indexOf(stringToRank) === 0) {
    return rankings.STARTS_WITH + caseRank;
  } // word starts with


  if (testString.indexOf(" " + stringToRank) !== -1) {
    return rankings.WORD_STARTS_WITH + caseRank;
  } // is a part inside a cased string


  if (isPartial) {
    return rankings.STRING_CASE + caseRank;
  } // is acronym for a cased string


  if (caseRank > 0 && isCasedAcronym) {
    return rankings.STRING_CASE_ACRONYM + caseRank;
  } // contains


  if (testString.indexOf(stringToRank) !== -1) {
    return rankings.CONTAINS + caseRank;
  } else if (stringToRank.length === 1) {
    // If the only character in the given stringToRank
    //   isn't even contained in the testString, then
    //   it's definitely not a match.
    return rankings.NO_MATCH;
  } // acronym


  if (getAcronym(testString).indexOf(stringToRank) !== -1) {
    return rankings.ACRONYM + caseRank;
  } // will return a number between rankings.MATCHES and
  // rankings.MATCHES + 1 depending  on how close of a match it is.


  return getClosenessRanking(testString, stringToRank);
}
/**
 * Generates an acronym for a string.
 *
 * @param {String} string the string for which to produce the acronym
 * @returns {String} the acronym
 */


function getAcronym(string) {
  var acronym = '';
  var wordsInString = string.split(' ');
  wordsInString.forEach(function (wordInString) {
    var splitByHyphenWords = wordInString.split('-');
    splitByHyphenWords.forEach(function (splitByHyphenWord) {
      acronym += splitByHyphenWord.substr(0, 1);
    });
  });
  return acronym;
}
/**
 * Returns a score base on the case of the testString
 * @param {String} testString - the string to test against
 * @returns {Number} the number of the ranking,
 * based on the case between 0 and 1 for how the testString matches the case
 */


function getCaseRanking(testString) {
  var containsUpperCase = testString.toLowerCase() !== testString;
  var containsDash = testString.indexOf('-') >= 0;
  var containsUnderscore = testString.indexOf('_') >= 0;

  if (!containsUpperCase && !containsUnderscore && containsDash) {
    return caseRankings.KEBAB;
  }

  if (!containsUpperCase && containsUnderscore && !containsDash) {
    return caseRankings.SNAKE;
  }

  if (containsUpperCase && !containsDash && !containsUnderscore) {
    var startsWithUpperCase = testString[0].toUpperCase() === testString[0];

    if (startsWithUpperCase) {
      return caseRankings.PASCAL;
    }

    return caseRankings.CAMEL;
  }

  return caseRankings.NO_CASE;
}
/**
 * Returns whether the stringToRank is one of the case parts in the testString (works with any string case)
 * @example
 * // returns true
 * isPartialOfCase('helloWorld', 'world', caseRankings.CAMEL)
 * @example
 * // returns false
 * isPartialOfCase('helloWorld', 'oworl', caseRankings.CAMEL)
 * @param {String} testString - the string to test against
 * @param {String} stringToRank - the string to rank
 * @param {Number} caseRanking - the ranking score based on case of testString
 * @returns {Boolean} whether the stringToRank is one of the case parts in the testString
 */


function isPartialOfCase(testString, stringToRank, caseRanking) {
  var testIndex = testString.toLowerCase().indexOf(stringToRank.toLowerCase());

  switch (caseRanking) {
    case caseRankings.SNAKE:
      return testString[testIndex - 1] === '_';

    case caseRankings.KEBAB:
      return testString[testIndex - 1] === '-';

    case caseRankings.PASCAL:
    case caseRankings.CAMEL:
      return testIndex !== -1 && testString[testIndex] === testString[testIndex].toUpperCase();

    default:
      return false;
  }
}
/**
 * Check if stringToRank is an acronym for a partial case
 * @example
 * // returns true
 * isCaseAcronym('super_duper_file', 'sdf', caseRankings.SNAKE)
 * @param {String} testString - the string to test against
 * @param {String} stringToRank - the acronym to test
 * @param {Number} caseRank - the ranking of the case
 * @returns {Boolean} whether the stringToRank is an acronym for the testString
 */


function isCaseAcronym(testString, stringToRank, caseRank) {
  var splitValue = null;

  switch (caseRank) {
    case caseRankings.SNAKE:
      splitValue = '_';
      break;

    case caseRankings.KEBAB:
      splitValue = '-';
      break;

    case caseRankings.PASCAL:
    case caseRankings.CAMEL:
      splitValue = /(?=[A-Z])/;
      break;

    default:
      splitValue = null;
  }

  var splitTestString = testString.split(splitValue);
  return stringToRank.toLowerCase().split('').reduce(function (correct, char, charIndex) {
    var splitItem = splitTestString[charIndex];
    return correct && splitItem && splitItem[0].toLowerCase() === char;
  }, true);
}
/**
 * Returns a score based on how spread apart the
 * characters from the stringToRank are within the testString.
 * A number close to rankings.MATCHES represents a loose match. A number close
 * to rankings.MATCHES + 1 represents a tighter match.
 * @param {String} testString - the string to test against
 * @param {String} stringToRank - the string to rank
 * @returns {Number} the number between rankings.MATCHES and
 * rankings.MATCHES + 1 for how well stringToRank matches testString
 */


function getClosenessRanking(testString, stringToRank) {
  var matchingInOrderCharCount = 0;
  var charNumber = 0;

  function findMatchingCharacter(matchChar, string, index) {
    for (var j = index; j < string.length; j++) {
      var stringChar = string[j];

      if (stringChar === matchChar) {
        matchingInOrderCharCount += 1;
        return j + 1;
      }
    }

    return -1;
  }

  function getRanking(spread) {
    var inOrderPercentage = matchingInOrderCharCount / stringToRank.length;
    var ranking = rankings.MATCHES + inOrderPercentage * (1 / spread);
    return ranking;
  }

  var firstIndex = findMatchingCharacter(stringToRank[0], testString, 0);

  if (firstIndex < 0) {
    return rankings.NO_MATCH;
  }

  charNumber = firstIndex;

  for (var i = 1; i < stringToRank.length; i++) {
    var matchChar = stringToRank[i];
    charNumber = findMatchingCharacter(matchChar, testString, charNumber);
    var found = charNumber > -1;

    if (!found) {
      return rankings.NO_MATCH;
    }
  }

  var spread = charNumber - firstIndex;
  return getRanking(spread);
}
/**
 * Sorts items that have a rank, index, and keyIndex
 * @param {Object} a - the first item to sort
 * @param {Object} b - the second item to sort
 * @return {Number} -1 if a should come first, 1 if b should come first, 0 if equal
 */


function sortRankedItems(a, b, baseSort) {
  var aFirst = -1;
  var bFirst = 1;
  var aRank = a.rank,
      aKeyIndex = a.keyIndex;
  var bRank = b.rank,
      bKeyIndex = b.keyIndex;

  if (aRank === bRank) {
    if (aKeyIndex === bKeyIndex) {
      // use the base sort function as a tie-breaker
      return baseSort(a, b);
    } else {
      return aKeyIndex < bKeyIndex ? aFirst : bFirst;
    }
  } else {
    return aRank > bRank ? aFirst : bFirst;
  }
}
/**
 * Prepares value for comparison by stringifying it, removing diacritics (if specified)
 * @param {String} value - the value to clean
 * @param {Object} options - {keepDiacritics: whether to remove diacritics}
 * @return {String} the prepared value
 */


function prepareValueForComparison(value, _ref4) {
  var keepDiacritics = _ref4.keepDiacritics;
  value = "" + value; // toString

  if (!keepDiacritics) {
    value = removeAccents__default['default'](value);
  }

  return value;
}
/**
 * Gets value for key in item at arbitrarily nested keypath
 * @param {Object} item - the item
 * @param {Object|Function} key - the potentially nested keypath or property callback
 * @return {Array} - an array containing the value(s) at the nested keypath
 */


function getItemValues(item, key) {
  if (typeof key === 'object') {
    key = key.key;
  }

  var value;

  if (typeof key === 'function') {
    value = key(item); // eslint-disable-next-line no-negated-condition
  } else if (key.indexOf('.') !== -1) {
    // handle nested keys
    value = key.split('.').reduce(function (itemObj, nestedKey) {
      return itemObj ? itemObj[nestedKey] : null;
    }, item);
  } else {
    value = item[key];
  } // concat because `value` can be a string or an array
  // eslint-disable-next-line


  return value != null ? [].concat(value) : null;
}
/**
 * Gets all the values for the given keys in the given item and returns an array of those values
 * @param {Object} item - the item from which the values will be retrieved
 * @param {Array} keys - the keys to use to retrieve the values
 * @return {Array} objects with {itemValue, attributes}
 */


function getAllValuesToRank(item, keys) {
  return keys.reduce(function (allVals, key) {
    var values = getItemValues(item, key);

    if (values) {
      values.forEach(function (itemValue) {
        allVals.push({
          itemValue: itemValue,
          attributes: getKeyAttributes(key)
        });
      });
    }

    return allVals;
  }, []);
}
/**
 * Gets all the attributes for the given key
 * @param {Object|String} key - the key from which the attributes will be retrieved
 * @return {Object} object containing the key's attributes
 */


function getKeyAttributes(key) {
  if (typeof key === 'string') {
    key = {
      key: key
    };
  }

  return _extends__default['default']({
    maxRanking: Infinity,
    minRanking: -Infinity
  }, key);
}

exports.default = matchSorter;
exports.rankings = rankings;