莫约利奇如何修改perl语法

Question

阅读mojolicious minions文档我找到了以下代码：

use v5.28;
use Mojolicious::Lite;
use experimental qw( signatures );
use Time::HiRes qw( time );

plugin Minion => {
    SQLite => 'sqlite:' . app->home->child('minion.db'),
};

# ...
app->start;

如何 找到以下代码：他们是否创建了一个新的语法插件minion =＆gt; {...}？我从未在经典的佩尔书中见过。它是带有哈希参数的函数调用：“小牛仔”是钥匙，而hashref {...}是一个值？

他们还调用app-＆gt; start - app是返回祝福的hashref的功能吗？但是，如果这是一个哈希，为什么“开始”不会封闭在牙套中？这个语法对我来说很奇怪。

Answer 1

app是返回$ app的函数，它是mojolicious :: lite = lite = hash

app-＆gt; start is same as app()->start

https://github.com/mojolicious/mojo/blob/24d1d1987dbfbe27eaaa37dd5db692d2deb8d07f/lib/Mojolicious/Plugin/Config.pm#L12-L14

"sub app; local *app = sub { \$app }; use Mojo::Base -strict; $content";
                             |
                             ^ not a reference but escape
                             due to eval() of double quoted string

Reproduction

perl -MMojolicious::Lite -E 'no warnings; sub foo; local *foo = sub { app }; say for foo, app'

output

Mojolicious::Lite=HASH(0xe72080)
Mojolicious::Lite=HASH(0xe72080)

plugin< /code>是一个常规功能，

perl -MData::Dumper -wE 'sub plugin { print Dumper \@_ } plugin Minion => { SQLite => "sqlite:" }'
$VAR1 = [
          'Minion',
          {
            'SQLite' => 'sqlite:'
          }
        ];

您可以添加parens，然后将fat Comma放置为通常的功能调用，

plugin("Minion", { SQLite => "sqlite:" });