string-search.js

export class StringUtil {

    // How to use it: 
    // import { StringUtil } from 'utils/string-search';
    //
    //  objToSearch.filter((name) => {
    //    return StringUtil.stringRegExp(searchTerm, false).test(name);
    //  });

    static stringRegExp(text: string, isGroup: boolean = true): RegExp {
      let RegexSearchTerm,
        RegExMap,
        term = '';
      RegExMap = {
        'A': '[AÀÁÂÃÄÅ]',
        'À': '[AÀÁÂÃÄÅ]',
        'Á': '[AÀÁÂÃÄÅ]',
        'Â': '[AÀÁÂÃÄÅ]',
        'Ã': '[AÀÁÂÃÄÅ]',
        'Å': '[AÀÁÂÃÄÅ]',
        'E': '[EÉÈÊẼË]',
        'É': '[EÉÈÊẼË]',
        'È': '[EÉÈÊẼË]',
        'Ê': '[EÉÈÊẼË]',
        'Ẽ': '[EÉÈÊẼË]',
        'Ë': '[EÉÈÊẼË]',
        'I': '[IÌÍÏĨÎ]',
        'Ì': '[IÌÍÏĨÎ]',
        'Í': '[IÌÍÏĨÎ]',
        'Ï': '[IÌÍÏĨÎ]',
        'Ĩ': '[IÌÍÏĨÎ]',
        'Î': '[IÌÍÏĨÎ]',
        'O': '[OÒÓÕÔÖ]',
        'Ö': '[OÒÓÕÔÖ]',
        'Ò': '[OÒÓÕÔÖ]',
        'Ó': '[OÒÓÕÔÖ]',
        'Õ': '[OÒÓÕÔÖ]',
        'Ô': '[OÒÓÕÔÖ]',
        'U': '[UÙÚÜÛŨ]',
        'Ù': '[UÙÚÜÛŨ]',
        'Ú': '[UÙÚÜÛŨ]',
        'Ü': '[UÙÚÜÛŨ]',
        'Û': '[UÙÚÜÛŨ]',
        'Ũ': '[UÙÚÜÛŨ]',
        'C': '[CÇ]',
        'Ç': '[CÇ]',
        'N': '[NÑ]',
        'Ñ': '[NÑ]',
        '(': '\\(',
        ')': '\\)',
        '[': '\\[',
        ']': '\\]'
      };

      RegexSearchTerm = text.toUpperCase();

      for (let i = 0, len = RegexSearchTerm.length; len--; i += 1) {
        let charItem = RegexSearchTerm.charAt(i);
        term += (charItem in RegExMap) ? RegExMap[charItem] : charItem;
      }

      term = (isGroup) ? `(${term})` : term;

      return new RegExp(term, 'gi');
    }

    /**
     * http://stackoverflow.com/questions/7616461/generate-a-hash-from-string-in-javascript-jquery
     * @param value
     * @returns {number}
     */
    static hashCode(value: string) {
      let hash = 0, i, chr, len;
      if (value.length === 0) return hash;
      for (i = 0, len = value.length; i < len; i++) {
        chr = value.charCodeAt(i);
        hash = ((hash << 5) - hash) + chr;
        hash |= 0; // Convert to 32bit integer
      }
      return hash;
    }
  }