#!/home/rir/rakudo/parrot_install/bin/perl6


grammar OP {
    token TOP {
        <op>+
    }
    token op {
        <cop> | <sop> | <bop>
    }
    token cop {     # constrained
        <short> <sep>  <long> <div> <char>+
    }
    token sop {     # string
        <short> <sep> <long> <div>
    }
    token bop {     # bool
        <short> <sep> <long>
    }
    token long {
        \w+
    }
    token short {
        \w
    }
    token char {   # XXX Rename flag.  Eliminate '_'.
        \w
    }
    rule sep {
        ':'
    }
    rule div {
        '/'
    }
}

my $s = 'a:aaa b:bbb/ c:ccccc/def';

my $match  = OP.parse($s);

die "failed" unless $match;


say '$match<op>: ', $match<op>;
say '$match.from: ', $match.from, ' $match.to: ', $match.to;
say '$match.chars: ', $match.chars;
say '$match.orig: ', $match.orig;
say '$match.Str: ', $match.Str;
say '$match.ast: ', $match.ast;
say '$match.caps:  is not found';
say '$match.pos:  is not found';

my @array  = $match;
say '@array = $match; then  @array: [';
for @array -> $i { say $i ; }
say "]";
[download]

I have a match object that doesn't appear to contain what I'd like. The examples, I've found, are not working for me; I find SO5 a bit thick. Attempting this with a grammar is a learning exercise.

In the above, I'd like to grab ops, know their "type" and insert into a hash keyed on the shorts.

Is this arranged correctly to avoid a partial sop matching as a bop?

The input string will be small; should I walk the string or walk the match object? As an exercise, treating the problem like a larger language appeals?

How do I traverse $match?

$match is supposed to work just like $/, yes?

I don't care to capture seps or divs but I would like to abstract the values. Should this be done in the grammar? --by variables?

Be well,
rir -- swimming a sea of sticky voluminous syntax errors all alike