raku - 不能在 `qqww` 或 `qqww:to` 结构中使用冒号对

Question

我想使用 Class 生成一个 json 行, 我覆盖了 gist方法，以便它打印我想要的内容:

my $ak = '7111ac873c9dcd5fc335ded47630d050';
my $st = '1523451601875';
my $ifo = 'true';
my $uu = "15778787898988090";

class Stay {
  has $.ak  is rw = '7111ac873c9dcd5fc335ded47630d050';
  has $.uu  is rw;
  has $.ifo is rw;
  has $.st  is rw;

  method gist() {
    #return qqww/{"ev":"app","ak":"$!ak","uu":"$!uu","ifo":"$!ifo","st":"$!st"}/;

    return qqww:to「EOF」;
    {"ev":"app","ak":"$!ak","uu":"$!uu","ifo":"$!ifo","st":"$!st"}
    EOF
  }
}

say Stay.new(uu => $uu, ifo => $ifo, st => $st); 

但失败了:

===SORRY!=== Error while compiling /Users/ohmycloud/Desktop/stay.pl6
Confused
at /Users/ohmycloud/Desktop/stay.pl6:18
------>     {"ev":⏏"app","ak":"$!ak","uu":"$!uu","ifo":"$!i
    expecting any of:
        colon pair

我想要的是:

{"ev":"app","ak":"7111ac873c9dcd5fc335ded47630d050","uu":"15778787898988090","ifo":"true","st":"1523451601875"}

为什么我不能在 qqww 中使用冒号对或 qq:to结构？

Answer 1

{}在双引号中有特殊含义。他们必须逃脱

qq:to「EOF」;
\{"ev":"app","ak":"$!ak","uu":"$!uu","ifo":"$!ifo","st":"$!st"\}
EOF

您需要 qq ，不是 qqww这使名单。

您可以使用 fmt

(:ev<app>, :$!ak, :$!uu, :$!ifo, :$!st).fmt('"%s":"%s"', ',').fmt('{%s}')

或 JSON::Fast

require JSON::Fast <&to-json>;
{:ev<app>, :$!ak, :$!uu, :$!ifo, :$!st}.&to-json

甚至

require JSON::Fast <&to-json>;
self.^attributes.map( {.name => .get_value(self)} ).Hash.&to-json