commit | 7edabc9bcd99c574acce45a1d4e9ec9eb2bb7aa0 | [log] [tgz] |
---|---|---|
author | Kevin Moore <kevmoo@users.noreply.github.com> | Thu Mar 01 15:29:14 2018 -0800 |
committer | Natalie Weizenbaum <nweiz@google.com> | Thu Mar 01 15:29:14 2018 -0800 |
tree | ff8dae2ec5aad9476584d768ac06375eae876432 | |
parent | 005fab6a6bc2a64ad96aa4b3d19a5ca9d7725efa [diff] |
Enable Travis-CI (#7) Fixes #6
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'; import 'package:string_scanner/string_scanner.dart'; num parseNumber(String source) { // Scan a number ("1", "1.5", "-3"). var scanner = new 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. var 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(new RegExp(r"\d+")); // [Scanner.lastMatch] holds the [MatchData] for the most recent call to // [Scanner.scan], [Scanner.expect], or [Scanner.matches]. var number = int.parse(scanner.lastMatch[0]); if (scanner.scan(".")) { scanner.expect(new RegExp(r"\d+")); var 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; }