commit | c9609753d323cdb5bfe0c02079a874cf36470cb5 | [log] [tgz] |
---|---|---|
author | Kevin Moore <kevmoo@users.noreply.github.com> | Tue Jul 28 23:50:30 2020 |
committer | GitHub <noreply@github.com> | Tue Jul 28 23:50:30 2020 |
tree | a38add99b71e0ee277b4312e5c16537aa786bd2a | |
parent | d444b920b1622864d6676bbb548c455f2d1ef935 [diff] |
Update Travis-CI config to use dev channel (#24)
This package exposes a StringScanner
type that makes it easy to parse a string using a series of Pattern
s. For example:
import 'dart:math' as math; import 'package:string_scanner/string_scanner.dart'; num parseNumber(String source) { // Scan a number ("1", "1.5", "-3"). final scanner = StringScanner(source); // [Scanner.scan] tries to consume a [Pattern] and returns whether or not it // succeeded. It will move the scan pointer past the end of the pattern. final negative = scanner.scan('-'); // [Scanner.expect] consumes a [Pattern] and throws a [FormatError] if it // fails. Like [Scanner.scan], it will move the scan pointer forward. scanner.expect(RegExp(r'\d+')); // [Scanner.lastMatch] holds the [MatchData] for the most recent call to // [Scanner.scan], [Scanner.expect], or [Scanner.matches]. var number = num.parse(scanner.lastMatch[0]); if (scanner.scan('.')) { scanner.expect(RegExp(r'\d+')); final decimal = scanner.lastMatch[0]; number += int.parse(decimal) / math.pow(10, decimal.length); } // [Scanner.expectDone] will throw a [FormatError] if there's any input that // hasn't yet been consumed. scanner.expectDone(); return (negative ? -1 : 1) * number; }