Alternate version of grammar not working as I'd prefer - grammar

Question

This code parses $string as I'd like:
#! /usr/bin/env raku
my $string = q:to/END/;
aaa bbb # this has trailing spaces which I want to keep
kjkjsdf
kjkdsf
END
grammar Markdown {
token TOP { ^ ([ <blank> | <text> ])+ $ }
token blank { [ \h* <.newline> ] }
token text { <indent> <content> }
token indent { \h* }
token newline { \n }
token content { \N*? <trailing>* <.newline> }
token trailing { \h+ }
}
my $match = Markdown.parse($string);
$match.say;
OUTPUT
｢aaa bbb
kjkjsdf
kjkdsf
｣
0 => ｢aaa bbb
｣
text => ｢aaa bbb
｣
indent => ｢｣
content => ｢aaa bbb
｣
trailing => ｢ ｣
0 => ｢
｣
blank => ｢
｣
0 => ｢ kjkjsdf
｣
text => ｢ kjkjsdf
｣
indent => ｢ ｣
content => ｢kjkjsdf
｣
0 => ｢kjkdsf
｣
text => ｢kjkdsf
｣
indent => ｢｣
content => ｢kjkdsf
｣
Now, the only problem I'm having is that I'd like the <trailing> level to be in the same level of the hierarchy as <indent> and <content> captures.
So I tried this grammar:
grammar Markdown {
token TOP { ^ ([ <blank> | <text> ])+ $ }
token blank { [ \h* <.newline> ] }
token text { <indent> <content> <trailing>* <.newline> }
token indent { \h* }
token newline { \n }
token content { \N*? }
token trailing { \h+ }
}
However, it breaks the parsing. So I tried this:
token TOP { ^ ([ <blank> | <text> ])+ $ }
token blank { [ \h* <.newline> ] }
token text { <indent> <content>*? <trailing>* <.newline> }
token indent { \h* }
token newline { \n }
token content { \N }
token trailing { \h+ }
And got:
0 => ｢aaa bbb
｣
text => ｢aaa bbb
｣
indent => ｢｣
content => ｢a｣
content => ｢a｣
content => ｢a｣
content => ｢ ｣
content => ｢b｣
content => ｢b｣
content => ｢b｣
trailing => ｢ ｣
0 => ｢
｣
blank => ｢
｣
0 => ｢ kjkjsdf
｣
text => ｢ kjkjsdf
｣
indent => ｢ ｣
content => ｢k｣
content => ｢j｣
content => ｢k｣
content => ｢j｣
content => ｢s｣
content => ｢d｣
content => ｢f｣
0 => ｢kjkdsf
｣
text => ｢kjkdsf
｣
indent => ｢｣
content => ｢k｣
content => ｢j｣
content => ｢k｣
content => ｢d｣
content => ｢s｣
content => ｢f｣
This is pretty close to what I want but it has the undesirable effect of breaking <content> up into individual letters, which is not ideal. I could fix this pretty easily after the fact by massaging the $match object but would like to try to improve my skills with grammars.

Answer 1

quick and dirty
my $string = q:to/END/;
aaa bbb
kjkjsdf
kjkdsf
END
grammar Markdown {
token TOP { ^ ([ <blank> | <text> ])+ $ }
token blank { [ \h* <.newline> ] }
token text { <indent>? $<content>=\N*? <trailing>? <.newline> }
token indent { \h+ }
token newline { \n }
token trailing { \h+ }
}
my $match = Markdown.parse($string);
$match.say;
lookahead assertions
my $string = q:to/END/;
aaa bbb
kjkjsdf
kjkdsf
END
grammar Markdown {
token TOP { ^ ([ <blank> | <text> ])+ $ }
token blank { [ \h* <.newline> ] }
token text { <indent>? <content> <trailing>? <.newline> }
token indent { \h+ }
token newline { \n }
token content { [<!before <trailing>> \N]+ }
token trailing { \h+ $$ }
}
my $match = Markdown.parse($string);
$match.say;
a little refactoring
my $string = q:to/END/;
aaa bbb
kjkjsdf
kjkdsf
END
grammar Markdown {
token TOP { ( <blank> | <text> )+ %% \n }
token blank { ^^ \h* $$ }
token text { <indent>? <content> <trailing>? }
token indent { ^^ \h+ }
token content { [<!before <trailing>> \N]+ }
token trailing { \h+ $$ }
}
my $match = Markdown.parse($string);
$match.say;

Answer 2

I was able to accomplish what I want with a negative lookahead assertion:
token TOP { ^ ([ <blank> | <text> ])+ $ }
token blank { [ \h* <.newline> ] }
token text { <indent>? <content> <trailing>? <.newline> }
token indent { \h+ }
token newline { \n }
token content { <.non_trailing> }
token non_trailing { ( . <!before \w \h* \n>)+ \S* }
token trailing { \h+ }
The <.non_trailing> suppresses the individual characters from appearing in the match object and the . <!before \w \h* \n>)+ \S* bit will match any character not followed by white space and a new line and the \S* bit gets the character left over from the negative lookahead.
OUTPUT
｢aaa bbb
kjkjsdf
kjkdsf
｣
0 => ｢aaa bbb
｣
text => ｢aaa bbb
｣
content => ｢aaa bbb｣
trailing => ｢ ｣
0 => ｢
｣
blank => ｢
｣
0 => ｢ kjkjsdf
｣
text => ｢ kjkjsdf
｣
indent => ｢ ｣
content => ｢kjkjsdf｣
0 => ｢kjkdsf
｣
text => ｢kjkdsf
｣
content => ｢kjkdsf｣