use v6.e.PREVIEW;
use Test;

plan 55;

my $ast;
my $deparsed;
my $raku;
sub ast(RakuAST::Node:D $body --> Nil) {
    $ast      := RakuAST::QuotedRegex.new(:$body);
    $deparsed := $ast.DEPARSE;
    $raku     := 'use experimental :rakuast; ' ~ $ast.raku;
    diag $deparsed.chomp;
}

sub match-ok($haystack, $expected, $additional = 0) is test-assertion {
  subtest "matches" => {
    plan 3 + $additional;
    is $haystack ~~ EVAL($ast), $expected, 'AST: EVAL is';
    is $haystack ~~ EVAL($deparsed), $expected, 'Str: EVAL is';
    is $haystack ~~ EVAL(EVAL $raku), $expected, 'Raku: EVAL is';
  }
}

sub match-nok($haystack) is test-assertion {
  subtest "doesn't match" => {
    plan 3;
    nok $haystack ~~ EVAL($ast), 'AST: EVAL nok';
    nok $haystack ~~ EVAL($deparsed), 'Str: EVAL nok';
    nok $haystack ~~ EVAL(EVAL $raku), 'Raku: EVAL nok';
  }
}

subtest 'Simple literal regex' => {
    # / foo/
    ast RakuAST::Regex::Literal.new('foo');
    is-deeply $deparsed, '/ foo/', 'deparse';

    for 'AST', $ast, 'Str', $deparsed, 'Raku', EVAL($raku) -> $type, $it {
        my $regex := EVAL($it);
        is "foobarbaz"   ~~ $regex, 'foo', "$type: start of string";
        is "42foobarbaz" ~~ $regex, 'foo', "$type: middle of string";
        nok "barbaz"     ~~ $regex,        "$type: not matched";
    }
}

subtest 'Sequential alternation takes first match even if second is longer' => {
    # / b|| bc/
    ast RakuAST::Regex::SequentialAlternation.new(
      RakuAST::Regex::Literal.new('b'),
      RakuAST::Regex::Literal.new('bc')
    );
    is-deeply $deparsed, '/ b|| bc/', 'deparse';

    match-ok "abcd", "b";
}

subtest 'Sequential alternation takes second match if first fails' => {
    # / x|| bc/
    ast RakuAST::Regex::SequentialAlternation.new(
      RakuAST::Regex::Literal.new('x'),
      RakuAST::Regex::Literal.new('bc')
    );
    is-deeply $deparsed, '/ x|| bc/', 'deparse';

    match-ok "abcd", "bc";
}

subtest 'Sequential alternation fails if no alternative matches' => {
    # / x|| y/
    ast RakuAST::Regex::SequentialAlternation.new(
      RakuAST::Regex::Literal.new('x'),
      RakuAST::Regex::Literal.new('y')
    );
    is-deeply $deparsed, '/ x|| y/', 'deparse';

    match-nok "abcd";
}

subtest 'LTM alternation takes longest match even if it is not first' => {
    # / b| bc/
    ast RakuAST::Regex::Alternation.new(
      RakuAST::Regex::Literal.new('b'),
      RakuAST::Regex::Literal.new('bc')
    );
    is-deeply $deparsed, '/ b| bc/', 'deparse';

    match-ok "abcd", "bc";
}

subtest 'Alternation takes second match if first fails' => {
    # / x| bc/
    ast RakuAST::Regex::Alternation.new(
      RakuAST::Regex::Literal.new('x'),
      RakuAST::Regex::Literal.new('bc')
    );
    is-deeply $deparsed, '/ x| bc/', 'deparse';

    match-ok "abcd", "bc";
}

subtest 'Alternation fails if no alternative matches' => {
    # / x| y/
    ast RakuAST::Regex::Alternation.new(
      RakuAST::Regex::Literal.new('x'),
      RakuAST::Regex::Literal.new('y')
    );
    is-deeply $deparsed, '/ x| y/', 'deparse';

    match-nok "abcd";
}

subtest 'Conjunction matches when both items match' => {
    # / .& c/
    ast RakuAST::Regex::Conjunction.new(
      RakuAST::Regex::CharClass::Any.new,
      RakuAST::Regex::Literal.new('c')
    );
    is-deeply $deparsed, '/ .& c/', 'deparse';

    match-ok "abcd", "c";
}

subtest 'Conjunction fails when one item does not match' => {
    # / .& x/
    ast RakuAST::Regex::Conjunction.new(
      RakuAST::Regex::CharClass::Any.new,
      RakuAST::Regex::Literal.new('x')
    );
    is-deeply $deparsed, '/ .& x/', 'deparse';

    match-nok "abcd";
}

subtest 'Conjunction fails when items match different lengths' => {
    # / .& cd/
    ast RakuAST::Regex::Conjunction.new(
      RakuAST::Regex::CharClass::Any.new,
      RakuAST::Regex::Literal.new('cd')
    );
    is-deeply $deparsed, '/ .& cd/', 'deparse';

    match-nok "abcd";
}

subtest 'Sequence needs one thing to match after the other (pass case)' => {
    # / .d/
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::CharClass::Any.new,
      RakuAST::Regex::Literal.new('d')
    );
    is-deeply $deparsed, '/ .d/', 'deparse';

    match-ok "abcd", "cd";
}

subtest 'Sequence needs one thing to match after the other (failure case)' => {
    # / .a/
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::CharClass::Any.new,
      RakuAST::Regex::Literal.new('a')
    );
    is-deeply $deparsed, '/ .a/', 'deparse';

    match-nok "abcd";
}

subtest 'Beginning of string anchor works (pass case)' => {
    # / ^ ./
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::Anchor::BeginningOfString.new,
      RakuAST::Regex::CharClass::Any.new
    );
    is-deeply $deparsed, '/ ^ ./', 'deparse';

    match-ok "abcd", "a";
}

subtest 'Beginning of string anchor works (failure case)' => {
    # / ^ b/
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::Anchor::BeginningOfString.new,
      RakuAST::Regex::Literal.new('b')
    );
    is-deeply $deparsed, '/ ^ b/', 'deparse';

    match-nok "abcd";
}

subtest 'Beginning of line anchor works (pass case)' => {
    # / ^^ ./
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::Anchor::BeginningOfLine.new,
      RakuAST::Regex::CharClass::Any.new
    );
    is-deeply $deparsed, '/ ^^ ./', 'deparse';

    match-ok "abcd", "a";
}

subtest 'Beginning of line anchor works (failure case)' => {
    # / ^^ b/
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::Anchor::BeginningOfLine.new,
      RakuAST::Regex::Literal.new('b')
    );
    is-deeply $deparsed, '/ ^^ b/', 'deparse';

    match-nok "abcd";
}

subtest 'End of string anchor works (pass case)' => {
    # / .$ /
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::CharClass::Any.new,
      RakuAST::Regex::Anchor::EndOfString.new
    );
    is-deeply $deparsed, '/ .$ /', 'deparse';

    match-ok "abcde", "e";
}

subtest 'End of string anchor works (failure case)' => {
    # / b$ /
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::Literal.new('b'),
      RakuAST::Regex::Anchor::EndOfString.new
    );
    is-deeply $deparsed, '/ b$ /', 'deparse';

    match-nok "abcde";
}

subtest 'End of line anchor works (pass case)' => {
    # / .$$ /
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::CharClass::Any.new,
      RakuAST::Regex::Anchor::EndOfLine.new
    );
    is-deeply $deparsed, '/ .$$ /', 'deparse';

    match-ok "abcde", "e";
}

subtest 'End of line anchor works (failure case)' => {
    # / b$$ /
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::Literal.new('b'),
      RakuAST::Regex::Anchor::EndOfLine.new
    );
    is-deeply $deparsed, '/ b$$ /', 'deparse';

    match-nok "abcde";
}

subtest 'Right word boundary works' => {
    # / .e>> /
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::CharClass::Any.new,
      RakuAST::Regex::Literal.new('e'),
      RakuAST::Regex::Anchor::RightWordBoundary.new
    );
    is-deeply $deparsed, '/ .e>> /', 'deparse';

    for 'AST', $ast, 'Str', $deparsed, 'Raku', EVAL($raku) -> $type, $it {
        my $regex := EVAL($it);
        is "elizabeth the second" ~~ $regex, 'he', "$type: pass case";
        nok "elizabeth second" ~~ $regex, "$type: fail case";
    }
}

subtest 'Left word boundary works' => {
    # / << .t/
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::Anchor::LeftWordBoundary.new,
      RakuAST::Regex::CharClass::Any.new,
      RakuAST::Regex::Literal.new('t')
    );
    is-deeply $deparsed, '/ << .t/', 'deparse';

    for 'AST', $ast, 'Str', $deparsed, 'Raku', EVAL($raku) -> $type, $it {
        my $regex := EVAL($it);
        is "cat ethics committee" ~~ $regex, 'et', "$type: pass case";
        nok "cat committee" ~~ $regex, "$type: fail case";
    }
}

subtest 'Quantified + built-in character class matches' => {
    # / \d+/
    ast RakuAST::Regex::QuantifiedAtom.new(
      atom => RakuAST::Regex::CharClass::Digit.new,
      quantifier => RakuAST::Regex::Quantifier::OneOrMore.new
    );
    is-deeply $deparsed, '/ \d+/', 'deparse';

    match-ok "99cents", "99";
}

subtest 'Quantified * built-in character class matches' => {
    # / \d*/
    ast RakuAST::Regex::QuantifiedAtom.new(
      atom => RakuAST::Regex::CharClass::Digit.new,
      quantifier => RakuAST::Regex::Quantifier::ZeroOrMore.new
    );
    is-deeply $deparsed, '/ \d*/', 'deparse';

    match-ok "99cents", "99";
}

subtest 'Quantified ? built-in character class matches' => {
    # / \d?/
    ast RakuAST::Regex::QuantifiedAtom.new(
      atom => RakuAST::Regex::CharClass::Digit.new,
      quantifier => RakuAST::Regex::Quantifier::ZeroOrOne.new
    );
    is-deeply $deparsed, '/ \d?/', 'deparse';

    match-ok "99cents", "9";
}

subtest 'Quantified ** built-in character class matches' => {
    # / \d** 1^..^5/
    ast RakuAST::Regex::QuantifiedAtom.new(
      atom => RakuAST::Regex::CharClass::Digit.new,
      quantifier => RakuAST::Regex::Quantifier::Range.new(
        min => 1, max => 5, :excludes-min, :excludes-max
      )
    );
    is-deeply $deparsed, '/ \d** 1^..^5/', 'deparse';

    match-ok "99cents", "99";
}

subtest 'Quantified negated built-in character class matches' => {
    # / \D+/
    ast RakuAST::Regex::QuantifiedAtom.new(
      atom => RakuAST::Regex::CharClass::Digit.new(:negated),
      quantifier => RakuAST::Regex::Quantifier::OneOrMore.new
    );
    is-deeply $deparsed, '/ \D+/', 'deparse';

    match-ok "99cents", "cents";
}

subtest 'Quantified built-in character class matches (frugal mode)' => {
    # / \d+?/
    ast RakuAST::Regex::QuantifiedAtom.new(
      atom => RakuAST::Regex::CharClass::Digit.new,
      quantifier => RakuAST::Regex::Quantifier::OneOrMore.new(
        backtrack => RakuAST::Regex::Backtrack::Frugal
      )
    );
    is-deeply $deparsed, '/ \d+?/', 'deparse';

    match-ok "99cents", "9";
}

subtest 'Quantified negated built-in character class matches (frugal mode)' => {
    # / \D+?/
    ast RakuAST::Regex::QuantifiedAtom.new(
      atom => RakuAST::Regex::CharClass::Digit.new(:negated),
      quantifier => RakuAST::Regex::Quantifier::OneOrMore.new(
        backtrack => RakuAST::Regex::Backtrack::Frugal
      )
    );
    is-deeply $deparsed, '/ \D+?/', 'deparse';

    match-ok "99cents", 'c';
}

subtest 'Greedy quantifier will backtrack' => {
    # / ^ \d+!9/
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::Anchor::BeginningOfString.new,
      RakuAST::Regex::QuantifiedAtom.new(
        atom => RakuAST::Regex::CharClass::Digit.new,
        quantifier => RakuAST::Regex::Quantifier::OneOrMore.new(
          backtrack => RakuAST::Regex::Backtrack::Greedy
        )
      ),
      RakuAST::Regex::Literal.new('9')
    );
    is-deeply $deparsed, '/ ^ \d+!9/', 'deparse';

    match-ok "99cents", '99';
}

subtest 'Ratchet quantifier will not backtrack' => {
    # / ^ \d+:9/
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::Anchor::BeginningOfString.new,
      RakuAST::Regex::QuantifiedAtom.new(
        atom => RakuAST::Regex::CharClass::Digit.new,
        quantifier => RakuAST::Regex::Quantifier::OneOrMore.new(
          backtrack => RakuAST::Regex::Backtrack::Ratchet
        )
      ),
      RakuAST::Regex::Literal.new('9')
    );
    is-deeply $deparsed, '/ ^ \d+:9/', 'deparse';

    match-nok "99cents";
}

subtest 'Separator works (non-trailing case)' => {
    # / \d+% ","/
    ast RakuAST::Regex::QuantifiedAtom.new(
      atom => RakuAST::Regex::CharClass::Digit.new,
      quantifier => RakuAST::Regex::Quantifier::OneOrMore.new,
      separator => RakuAST::Regex::Literal.new(',')
    );
    is-deeply $deparsed, q|/ \d+% ","/|, 'deparse';

    match-ok "values: 1,2,3,4,stuff", '1,2,3,4';
}

subtest 'Separator works (trailing case)' => {
    # / \d+%% ","/
    ast RakuAST::Regex::QuantifiedAtom.new(
      atom => RakuAST::Regex::CharClass::Digit.new,
      quantifier => RakuAST::Regex::Quantifier::OneOrMore.new,
      separator => RakuAST::Regex::Literal.new(','),
      trailing-separator => True
    );
    is-deeply $deparsed, q|/ \d+%% ","/|, 'deparse';

    match-ok "values: 1,2,3,4,stuff", '1,2,3,4,';
}

subtest 'Separator must be between every quantified item' => {
    # / \d+% ","/
    ast RakuAST::Regex::QuantifiedAtom.new(
      atom => RakuAST::Regex::CharClass::Digit.new,
      quantifier => RakuAST::Regex::Quantifier::OneOrMore.new,
      separator => RakuAST::Regex::Literal.new(',')
    );
    is-deeply $deparsed, q|/ \d+% ","/|, 'deparse';

    match-ok "values: 1,2,33,4,stuff", '1,2,3';
}

subtest 'Regex groups compile correctly' => {
    # / [\d+]+% ","/
    ast RakuAST::Regex::QuantifiedAtom.new(
      atom => RakuAST::Regex::Group.new(
        RakuAST::Regex::QuantifiedAtom.new(
          atom => RakuAST::Regex::CharClass::Digit.new,
          quantifier => RakuAST::Regex::Quantifier::OneOrMore.new
        )
      ),
      quantifier => RakuAST::Regex::Quantifier::OneOrMore.new,
      separator => RakuAST::Regex::Literal.new(',')
    );
    is-deeply $deparsed, q|/ [\d+]+% ","/|, 'deparse';

    for 'AST', $ast, 'Str', $deparsed, 'Raku', EVAL($raku) -> $type, $it {
        my $regex := EVAL($it);
        is "values: 1,2,33,400,stuff" ~~ $regex, '1,2,33,400',
          "$type: did we get correct match";
        nok $/.list.keys,
          "$type: no positional captures from non-capturing group";
        nok $/.hash.keys,
          "$type: no named captures from non-capturing group";
    }
}

subtest 'Regex with two positional capturing groups matches correctly' => {
    # / (\w)\d(\w)/
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::CapturingGroup.new(
        RakuAST::Regex::CharClass::Word.new
      ),
      RakuAST::Regex::CharClass::Digit.new,
      RakuAST::Regex::CapturingGroup.new(
        RakuAST::Regex::CharClass::Word.new
      )
    );
    is-deeply $deparsed, '/ (\w)\d(\w)/', 'deparse';

    for 'AST', $ast, 'Str', $deparsed, 'Raku', EVAL($raku) -> $type, $it {
        my $regex := EVAL($it);
        is "2a1b" ~~ $regex, 'a1b',
          "$type: did we get correct match";
        is $/.list.elems, 2,
          "$type: Two positional captures";
        is $0, 'a',
          "$type: First positional capture is correct";
        is $1, 'b',
          "$type: Second positional capture is correct";
        nok $/.hash,
          "$type: No named captures";
    }
}

subtest 'Match from and match to markers works' => {
    # / b<( \d)> c/
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::Literal.new('b'),
      RakuAST::Regex::MatchFrom.new,
      RakuAST::Regex::CharClass::Digit.new,
      RakuAST::Regex::MatchTo.new,
      RakuAST::Regex::Literal.new('c')
    );
    is-deeply $deparsed, '/ b<( \d)> c/', 'deparse';

    match-ok "a1b2c", '2';
}

subtest 'Match involving a quoted string literal works' => {
    # / lie/
    ast RakuAST::Regex::Quote.new(
      RakuAST::QuotedString.new(
       :segments[RakuAST::StrLiteral.new('lie')]
      )
    );
    is-deeply $deparsed, '/ lie/', 'deparse';

    match-ok "believe", 'lie';
}

subtest 'Match involving a quoted string with interpolation works' => {
    my $end = 've';

    # / e$end/
    ast RakuAST::Regex::Quote.new(
      RakuAST::QuotedString.new(
        :segments[
          RakuAST::StrLiteral.new('e'),
          RakuAST::Var::Lexical.new('$end')
        ]
      )
    );
    is-deeply $deparsed, '/ e$end/', 'deparse';

    is "believe" ~~ EVAL($ast), 'eve', 'EVAL over RakuAST';
    is "believe" ~~ EVAL($deparsed), 'eve', 'EVAL over deparsed AST';
}

subtest 'Match involving quote words works' => {
    # / <{ qqw/link inky linky/ }>/
    ast RakuAST::Regex::Quote.new(
      RakuAST::QuotedString.new(
        :segments[RakuAST::StrLiteral.new('link inky linky')],
        :processors['words']
      )
    );
    is-deeply $deparsed, '/ <{ qqw/link inky linky/ }>/', 'deparse';

    match-ok "slinky sprint", 'linky';
}

subtest 'Match with positional backreference' => {
    # / (o)$0/
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::CapturingGroup.new(
        RakuAST::Regex::Literal.new("o"),
      ),
      RakuAST::Regex::BackReference::Positional.new(0)
    );
    is-deeply $deparsed, '/ (o)$0/', 'deparse';

    match-ok "foo", 'oo';
}

subtest 'Match with named backreference' => {
    # / $<bar>=o$<bar>/
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::NamedCapture.new(
        name  => 'bar',
        regex => RakuAST::Regex::Literal.new("o"),
      ),
      RakuAST::Regex::BackReference::Named.new("bar")
    );
    is-deeply $deparsed, '/ $<bar>=o$<bar>/', 'deparse';

    match-ok "foo", 'oo';
}

subtest 'Match with interpolated variable' => {
    # / $expected/
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::Interpolation.new(
        var => RakuAST::Var::Lexical.new('$expected')
      ),
    );
    is-deeply $deparsed, '/ $expected/', 'deparse';

    match-ok "foo", 'oo';
}

subtest 'Match with block' => {
    # / o{ is($/, "foo", "block") }o/
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::Literal.new("o"),
      RakuAST::Regex::Block.new(
        RakuAST::Block.new(
          body => RakuAST::Blockoid.new(
            RakuAST::StatementList.new(
              RakuAST::Statement::Expression.new(
                expression => RakuAST::Call::Name.new(
                  name => RakuAST::Name.from-identifier('is'),
                  args => RakuAST::ArgList.new(
                    RakuAST::Var::Lexical.new('$/'),
                    RakuAST::StrLiteral.new("o"),
                    RakuAST::StrLiteral.new("block")
                  )
                )
              )
            )
          )
        )
      ),
      RakuAST::Regex::Literal.new("o")
    );
    is-deeply $deparsed,
      qq:!c:!s|/ o{\n    is($/, "o", "block")\n}o/|,
      'deparse';

    match-ok "foo", 'oo', 3;
}

subtest 'Match with variable definition' => {
    # / o:my $foo; o/
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::Literal.new("o"),
      RakuAST::Regex::Statement.new(
        RakuAST::Statement::Expression.new(
          expression => RakuAST::VarDeclaration::Simple.new(
            scope => 'my',
            sigil => '$',
            desigilname => RakuAST::Name.from-identifier('foo'),
          )
        )
      ),
      RakuAST::Regex::Literal.new("o")
    );
    is-deeply $deparsed, '/ o:my $foo; o/', 'deparse';

    match-ok "Foo", 'oo';
}

subtest 'Match with ignoring case' => {
    # / :i oo/
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::InternalModifier::IgnoreCase.new,
      RakuAST::Regex::Literal.new("oo"),
    );
    is-deeply $deparsed, '/ :i oo/', 'deparse';

    match-ok "FOO", 'OO';
}

subtest 'Match with *not* ignoring case' => {
    # / :!i OO/
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::InternalModifier::IgnoreCase.new(:negated),
      RakuAST::Regex::Literal.new("OO"),
    );
    is-deeply $deparsed, '/ :!i OO/', 'deparse';

    match-ok "FOO", 'OO';
}

subtest 'No match with *not* ignoring case' => {
    # / :!i oo/
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::InternalModifier::IgnoreCase.new(:negated),
      RakuAST::Regex::Literal.new("oo"),
    );
    is-deeply $deparsed, '/ :!i oo/', 'deparse';

    match-nok "FOO";
}

subtest 'Match with ignoring mark' => {
    # / :m oo/
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::InternalModifier::IgnoreMark.new,
      RakuAST::Regex::Literal.new("oo"),
    );
    is-deeply $deparsed, '/ :m oo/', 'deparse';

    match-ok "Fõõ", 'õõ';
}

subtest 'Match with *not* ignoring mark' => {
    # / :!m ôô/
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::InternalModifier::IgnoreMark.new(:negated),
      RakuAST::Regex::Literal.new("ôô"),
    );
    is-deeply $deparsed, '/ :!m ôô/', 'deparse';

    match-ok "Fôô", 'ôô';
}

subtest 'No match with *not* ignoring mark' => {
    # / :!m oo/
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::InternalModifier::IgnoreMark.new(:negated),
      RakuAST::Regex::Literal.new("oo")
    );
    is-deeply $deparsed, '/ :!m oo/', 'deparse';

    match-nok "Föö";
}

subtest 'Match with ratchet' => {
    # / o:r o/
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::Literal.new("o"),
      RakuAST::Regex::InternalModifier::Ratchet.new,
      RakuAST::Regex::Literal.new("o")
    );
    is-deeply $deparsed, '/ o:r o/', 'deparse';

    match-ok "Foo", 'oo';
}

subtest 'Match without ratchet' => {
    # / o:!r o/
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::Literal.new("o"),
      RakuAST::Regex::InternalModifier::Ratchet.new(:negated),
      RakuAST::Regex::Literal.new("o")
    );
    is-deeply $deparsed, '/ o:!r o/', 'deparse';

    match-ok "Foo", 'oo';
}

subtest 'Match with sigspace' => {
    # / o:s o /
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::Literal.new("o"),
      RakuAST::Regex::InternalModifier::Sigspace.new,
      RakuAST::Regex::WithWhitespace.new(
        RakuAST::Regex::Literal.new("o")
      )
    );
    is-deeply $deparsed, '/ o:s o /', 'deparse';

    match-ok "Foo", 'oo';
}

subtest 'Match without sigspace' => {
    # / o :!s o/
    ast RakuAST::Regex::Sequence.new(
      RakuAST::Regex::WithWhitespace.new(
        RakuAST::Regex::Literal.new("o")
      ),
      RakuAST::Regex::InternalModifier::Sigspace.new(:negated),
      RakuAST::Regex::Literal.new("o")
    );
    is-deeply $deparsed, '/ o :!s o/', 'deparse';

    match-ok "Foo", 'oo';
}

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