specify

examples

import 'package:specify/specify.dart';
class StringContains extends Specification<String> {
 final String _substring;
 StringContains(this._substring);
 bool isSatisfiedBy(String aString) => aString.contains(_substring);
}
class StringNotContains extends StringContains {
 StringNotContains(String aSubstring) : super(aSubstring);
 bool isSatisfiedBy(String aString) => !super.isSatisfiedBy(aString);
}
class StringIn extends OrSpecification<String> {
 StringIn(List<String> aWordList) : super(
 aWordList.map((String aWord) => new StringContains(aWord)).toList()
 );
}
class StringNotIn extends AndSpecification<String> {
 StringNotIn(List<String> aWordList) : super(
 aWordList.map((String aWord) => new StringNotContains(aWord)).toList()
 );
}
main() {
 StringIn isWord = new StringIn(['foo', 'bar']);
 StringNotIn isNotWord = new StringNotIn(['baz', 'zim']);
 print(isWord('barge'));
 print(isNotWord('hello'));
}

filters

import 'package:specify/specify.dart';
class StringLength extends Specification<String> {
 final int _length;
 StringLength(this._length);
 bool isSatisfiedBy(String aString) => aString.length == _length;
}
class LengthFilter extends Filter<String> {
 LengthFilter(int aLength) : super(new StringLength(aLength));
}
main() {
 LengthFilter filter = new LengthFilter(3);
 print(filter(['foo', 'bar', 'nice', 'to', 'know', 'you']));
}