I'm not sure, but maybe such a structure is easier to create:
My inspiration is https://github.com/perl6/std/blob/master/viv#L187 which produces parse trees like
└─VAST::statementlist, BEG: 0, END: 7
├─VAST::statement, BEG: 0, END: 7
│ └─VAST::term__S_identifier, BEG: 0, END: 7, SYM: identifier, _from: 7,
│ │ _pos: 7, _specific: 1, dba: term, prec: z=
│ ├─VAST::identifier, BEG: 0, END: 3, TEXT: say
│ └─VAST::args, BEG: 3, END: 7, invocant: undef
│ └─VAST::arglist, BEG: 4, END: 7, WS: 1
│ └─VAST::term__S_value, BEG: 4, END: 6, SYM: value, WS: 1,
│ │ _specific: 1
│ └─VAST::value__S_number, BEG: 4, END: 6, SYM: number, WS: 1,
│ │ _specific: 1
│ └─VAST::number, BEG: 4, END: 6, WS: 1
│ └─VAST::integer, BEG: 4, END: 6, WS: 1
│ └─VAST::decint, BEG: 4, END: 6, TEXT: 42, WS: 1
└─VAST::eat_terminator, BEG: 7, END: 7, TEXT: , WS: 1
Update: just today a Perl 6 solution for Visualize a tree on rosettacode was entered, it produces similar output:
Shouldn't be to hard to port to Perl 5.
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