highlight-text/lib/index.js

Highlight text case and accent insensitive

'use strict';

exports.__esModule = true;
exports['default'] = highlightText;

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { 'default': obj }; }

var _lodashEscape = require('lodash.escape');

var _lodashEscape2 = _interopRequireDefault(_lodashEscape);

var _mergeRanges = require('merge-ranges');

var _mergeRanges2 = _interopRequireDefault(_mergeRanges);

var _diacritics = require('diacritics');

function allIndexesOf(str, word) {
  var indexes = [];
  for (var idx = str.indexOf(word); idx !== -1; idx = str.indexOf(word, idx + 1)) {
    indexes.push(idx);
  }
  return indexes;
}

function highlightText(text, highlight) {
  var tag = arguments.length <= 2 || arguments[2] === undefined ? 'b' : arguments[2];

  var escapedText = _lodashEscape2['default'](text);
  var normalizedText = _diacritics.remove(escapedText).toLowerCase();
  var highlightIntervals = _lodashEscape2['default'](highlight).split(/(\s+)/).map(function (word) {
    return word.trim();
  }).filter(function (word) {
    return word;
  }).reduce(function (intervals, word) {
    var normalizedWord = _diacritics.remove(word).toLowerCase();
    var wordIntervals = allIndexesOf(normalizedText, normalizedWord).map(function (idx) {
      return [idx, idx + normalizedWord.length];
    });
    return intervals.concat(wordIntervals);
  }, []);

  return _mergeRanges2['default'](highlightIntervals).reduceRight(function (reducedText, _ref) {
    var start = _ref[0];
    var end = _ref[1];

    return reducedText.slice(0, start) + ('<' + tag + '>') + reducedText.slice(start, end) + ('</' + tag + '>') + reducedText.slice(end);
  }, escapedText);
}

module.exports = exports['default'];