https://dartpad.dev/?id=db9fc6c6ea20ad1282574a24d3dc4e6d
期間内であればtrue。 片方がnullの場合は、未指定として無限遠からの判定イメージ。 両方がnullの場合は、期間未指定と考えて期間外扱い。
Last active
September 8, 2022 03:32
-
-
Save noboru-i/db9fc6c6ea20ad1282574a24d3dc4e6d to your computer and use it in GitHub Desktop.
Check term
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| void main() { | |
| _test1(); | |
| _test2(); | |
| _test3(); | |
| _test4(); | |
| // check `assert` works | |
| assert(false); | |
| } | |
| void _test1() { | |
| print('_test1'); | |
| final from = DateTime.parse('2022-08-01 00:00:00Z'); | |
| final to = DateTime.parse('2022-08-31 00:00:00Z'); | |
| assert(true == isInTerm(DateTime.parse('2022-08-11 00:00:00Z'), from, to)); | |
| assert(false == isInTerm(DateTime.parse('2022-07-11 00:00:00Z'), from, to)); | |
| assert(false == isInTerm(DateTime.parse('2022-09-11 00:00:00Z'), from, to)); | |
| } | |
| void _test2() { | |
| print('_test2'); | |
| final from = DateTime.parse('2022-08-01 00:00:00Z'); | |
| final to = null; | |
| assert(true == isInTerm(DateTime.parse('2022-08-11 00:00:00Z'), from, to)); | |
| assert(false == isInTerm(DateTime.parse('2022-07-11 00:00:00Z'), from, to)); | |
| assert(true == isInTerm(DateTime.parse('2022-09-11 00:00:00Z'), from, to)); | |
| } | |
| void _test3() { | |
| print('_test3'); | |
| final from = null; | |
| final to = DateTime.parse('2022-08-31 00:00:00Z'); | |
| assert(true == isInTerm(DateTime.parse('2022-08-11 00:00:00Z'), from, to)); | |
| assert(true == isInTerm(DateTime.parse('2022-07-11 00:00:00Z'), from, to)); | |
| assert(false == isInTerm(DateTime.parse('2022-09-11 00:00:00Z'), from, to)); | |
| } | |
| void _test4() { | |
| print('_test4'); | |
| final from = null; | |
| final to = null; | |
| assert(false == isInTerm(DateTime.parse('2022-08-11 00:00:00Z'), from, to)); | |
| assert(false == isInTerm(DateTime.parse('2022-07-11 00:00:00Z'), from, to)); | |
| assert(false == isInTerm(DateTime.parse('2022-09-11 00:00:00Z'), from, to)); | |
| } | |
| bool isInTerm(DateTime target, DateTime? from, DateTime? to) { | |
| if (from == null && to == null) { | |
| return false; | |
| } | |
| if (from == null) { | |
| return to!.isAfter(target); | |
| } | |
| if (to == null) { | |
| return from.isBefore(target); | |
| } | |
| return from.isBefore(target) && target.isBefore(to); | |
| } |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment