use v6-alpha;
use Test;

=pod

This file was originally derived from the perl5 CPAN module Perl6::Rules,
version 0.3 (12 Apr 2004), file t/exhaustive.t.

=cut

plan 44; # Will need to be changed once :exhaustive starts working.

if !eval('("a" ~~ /a/)') {
  skip_rest "skipped tests - rules support appears to be missing";
} else {

force_todo(2,3,5,6,10,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42);

my $str = "abrAcadAbbra";

my @expected = (
    [ 0 => 'abrAcadAbbra' ],
    [ 0 => 'abrAcadA'     ],
    [ 0 => 'abrAca'       ],
    [ 0 => 'abrA'         ],
    [ 3 =>    'AcadAbbra' ],
    [ 3 =>    'AcadA'     ],
    [ 3 =>    'Aca'       ],
    [ 5 =>      'adAbbra' ],
    [ 5 =>      'adA'     ],
    [ 7 =>        'Abbra' ],
);

for (1..2) -> $rep {
    ok($str ~~ m:i:exhaustive/ a .+ a /, "Repeatable every-way match ($rep)" );

    ok(@$/ == @expected, "Correct number of matches ($rep)" );
    my %expected; %expected{map {$_[1]}, @expected} = (1) x @expected;
    my %position; %position{map {$_[1]}, @expected} = map {$_[0]}, @expected;
    for (@$/) {
        ok( %expected{$_}, "Matched '$_' ($rep)" );
        ok( %position{$_} == $_.pos, "At correct position of '$_' ($rep)" );
        delete %expected{$_};
    }
    ok(%expected.keys == 0, "No matches missed ($rep)" );
}

ok(!( "abcdefgh" ~~ m:exhaustive/ a .+ a / ), 'Failed every-way match');
ok(@$/ == 0, 'No matches');

ok($str ~~ m:ex:i/ a (.+) a /, 'Capturing every-way match');

ok(@$/ == @expected, 'Correct number of capturing matches');
my %expected; %expected{map {$_[1]}, @expected} = (1) x @expected;
for (@$/) {
    ok( %expected{$_}, "Capture matched '$_'" );
    ok( $_[1] = substr($_[0],1,-1), "Captured within '$_'" );
    delete %expected{$_};
}

my @adj  = <time>;
my @noun = <time flies arrow>;
my @verb = <time flies like>;
my @art  = <an>;
my @prep = <like>;

ok( "time flies like an arrow" ~~
    m:s:ex/^    [
                $<adj>  := (@adj)
                $<subj> := (@noun)
                $<verb> := (@verb)
                $<art>  := (@art)
                $<obj>  := (@noun)
              |
                $<subj> := (@noun)
                $<verb> := (@verb)
                $<prep> := (@prep)
                $<art>  := (@art)
                $<obj>  := (@noun)
              |
                $<verb> := (@verb)
                $<obj>  := (@noun)
                $<prep> := (@prep)
                $<art>  := (@art)
                $<noun> := (@noun)
              ]
           /, 'Multiple capturing');

ok(eval(q{$/.matches[0]<adj>}),  'time',  'Capture 0 adj');
ok(eval(q{$/.matches[0]<subj>}), 'flies', 'Capture 0 subj');
ok(eval(q{$/.matches[0]<verb>}), 'like',  'Capture 0 verb');
ok(eval(q{$/.matches[0]<art>}),  'an',    'Capture 0 art');
ok(eval(q{$/.matches[0]<obj>}),  'arrow', 'Capture 0 obj');

ok(eval(q{$/.matches[1]<subj>}), 'time',  'Capture 1 subj');
ok(eval(q{$/.matches[1]<verb>}), 'flies', 'Capture 1 verb');
ok(eval(q{$/.matches[1]<prep>}), 'like',  'Capture 1 prep');
ok(eval(q{$/.matches[1]<art>}),  'an',    'Capture 1 art');
ok(eval(q{$/.matches[1]<obj>}),  'arrow', 'Capture 1 obj');

ok(eval(q{$/.matches[2]<verb>}), 'time',  'Capture 2 verb');
ok(eval(q{$/.matches[2]<obj>}),  'flies', 'Capture 2 obj');
ok(eval(q{$/.matches[2]<prep>}), 'like',  'Capture 2 prep');
ok(eval(q{$/.matches[2]<art>}),  'an',    'Capture 2 art');
ok(eval(q{$/.matches[2]<noun>}), 'arrow', 'Capture 2 noun');


rule subj  { <?noun> }
rule obj   { <?noun> }
rule noun  { time | flies | arrow }
rule verb  { flies | like | time }
rule adj   { time }
rule art   { an? }
rule prep  { like }

ok("time   flies   like    an     arrow" ~~
    m:s:ex/^ [ <adj>  <subj> <verb> <art> <obj>
                 | <subj> <verb> <prep> <art> <noun> 
                 | <verb> <obj>  <prep> <art> <noun>
                 ]
         /,
    "Any with capturing rules"
);

ok(eval(q{$/.matches[0]<adj>}),  'time',  'Rule capture 0 adj');
ok(eval(q{$/.matches[0]<subj>}), 'flies', 'Rule capture 0 subj');
ok(eval(q{$/.matches[0]<verb>}), 'like',  'Rule capture 0 verb');
ok(eval(q{$/.matches[0]<art>}),  'an',    'Rule capture 0 art');
ok(eval(q{$/.matches[0]<obj>}),  'arrow', 'Rule capture 0 obj');

ok(eval(q{$/.matches[1]<subj>}), 'time',  'Rule capture 1 subj');
ok(eval(q{$/.matches[1]<verb>}), 'flies', 'Rule capture 1 verb');
ok(eval(q{$/.matches[1]<prep>}), 'like',  'Rule capture 1 prep');
ok(eval(q{$/.matches[1]<art>}),  'an',    'Rule capture 1 art');
ok(eval(q{$/.matches[1]<noun>}), 'arrow', 'Rule capture 1 noun');

ok(eval(q{$/.matches[2]<verb>}), 'time',  'Rule capture 2 verb');
ok(eval(q{$/.matches[2]<obj>}),  'flies', 'Rule capture 2 obj');
ok(eval(q{$/.matches[2]<prep>}), 'like',  'Rule capture 2 prep');
ok(eval(q{$/.matches[2]<art>}),  'an',    'Rule capture 2 art');
ok(eval(q{$/.matches[2]<noun>}), 'arrow', 'Rule capture 2 noun');


ok(!( "fooooo" ~~ m:exhaustive { s o+ } ), 'Subsequent failed any match...');
ok(@$/ == 0, '...leaves @$/ empty');

}