October 2020
Beginner to intermediate
499 pages
9h 13m
Chinese
Content preview from Raku学习手册
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340
｜
第
17
章
my $filename = ...;
my $csv-data = $filename.IO.slurp;
my $csv-parser = Grammar::CSV.new but DoubledQuote;
使用这个对象解析你的数据：
my $match = $csv-parser.parse: $csv-data;
say $match // 'Failed!';
这样做并不能修正数据中的双引号，
""
仍然是
""
，不过可以在一个动作类中修正。
练习
17.6
调整
CSV
示例，这一次使用角色而不是继承。创建一个动作类，遇到转义双引
号时进行调整。如果愿意，可以从本书网站（
https://www.learningperl6.com/
）
的
downloads
部分下载
Grammars/test.csv
来测试。
17.8
小结
文法是
Perl 6
语言的一大亮点。你可以定义模式之间的复杂关系，并使用动作类在匹
配时运行任意复杂的代码。你会发现最终你的整个程序就是一个很大的文法。
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.