commit | 045498024df8f0a1cd0f717f12d60aec77d3d8ae | [log] [tgz] |
---|---|---|
author | Kevin Moore <kevmoo@users.noreply.github.com> | Tue Jan 17 07:13:00 2023 -0800 |
committer | GitHub <noreply@github.com> | Tue Jan 17 07:13:00 2023 -0800 |
tree | 821cd93d1262ad9eb1db389b6fe156592af6dc53 | |
parent | c58618df0f17cbed664b3868c949abb13491e4d3 [diff] |
dependabot: monthly is plenty (#54)
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; }