commit | 10435a4f468e480273f78a6cfa1615c82446ef47 | [log] [tgz] |
---|---|---|
author | Kevin Moore <kevmoo@users.noreply.github.com> | Tue Oct 25 09:15:34 2022 -0700 |
committer | GitHub <noreply@github.com> | Tue Oct 25 09:15:34 2022 -0700 |
tree | 4065db5c4b4283c99caaec62187cd6bef5978b48 | |
parent | 2d84b16d8ae03c3a8c2417b71abe0fe6de7d8bf6 [diff] |
Update minimum SDK, latest pkg:lints, update CI actions (#48)
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; }