AngularDart WildCardFilter :)

wildcard_search.dart

library wildcard_filter;

import 'package:angular/angular.dart';


class WildcardFilter{
  static final String DEFAULT_SEPARATOR = ' ';

  /*
   * AngularJS Filter fnc "call"
   *
   * for a list of object, and a query string.
   * 1. queryString break down into framgnets [getFragment]
   * 2. the list of object would be filtered by fragmnets multiple times.
   */
  List call(itemList, queryStr) {
    if (queryStr == null){
      return itemList;
    }else{

      if (itemList is Iterable && queryStr is String) {
        List fragments = getFragments(queryStr);
        List tempList = itemList;

        fragments.forEach((fQuery){
          tempList = tempList.where(
              (item) => testRules(item, fQuery)
          ).toList();
        });

        return tempList.toList();
      }
      return const [];
    }
  }

  /*
   * Breakdown a [query] string and produce a list of fragments
   */
  List getFragments(String query){
    List<String> fragList = query.trim().split(DEFAULT_SEPARATOR);
    return fragList;
  }

  /*
   * match string in string
   */
  bool matchStr(String target, String query){
    return target.toLowerCase().contains(query.toLowerCase());
  }

  /*
   * match string in txtList
   */
  bool matchStrList(List<String> target, String query){
    for(var item in target){
      if(matchStr(item, query)){
        return true;
      }
    }
    return false;
  }

  /*
   * Rules/Criteria to filter result.
   */
  bool testRules(item, fQuery){
    return (
        false
//        ||  matchStr(item.name, fQuery)
//        ||  matchStr(item.directions, fQuery)
//        ||  matchStrList(item.ingredients, fQuery)
//        ||  matchStr(item.toJson.toString(), fQuery) //search anything :)
    );
  }
}


@Formatter(name: 'wildcardNamefilter')
class WildcardNameFilter extends WildcardFilter{

  /*
   * Rules/Criteria to filter result.
   */
  bool testRules(item, fQuery){
    return (
        false
        ||  matchStr(item.name, fQuery)
        ||  matchStr(item.directions, fQuery)
        ||  matchStrList(item.ingredients, fQuery)
    );
  }

}