#!./perl

# Checks if the parser behaves correctly in edge cases
# (including weird syntax errors)

BEGIN { require "./test.pl"; }
plan( tests => 76 );

# Bug 20010528.007
eval q/"\x{"/;
like( $^EVAL_ERROR->{?description}, qr/^Missing right brace on \\x/,
    'syntax error in string, used to dump core' );

eval q/"\N{"/;
like( $^EVAL_ERROR->{?description}, qr/^Missing right brace on \\N/,
    'syntax error in string with incomplete \N' );
eval q/"\Nfoo"/;
like( $^EVAL_ERROR->{?description}, qr/^Missing braces on \\N/,
    'syntax error in string with incomplete \N' );

# Bug 20010831.001
eval '@($a, b) = @(1, 2);';
like( $^EVAL_ERROR->{?description}, qr/^Can't assign to constant item/,
    'bareword in list assignment' );

eval 'read(our $bla, "FILE", 1);';
like( $^EVAL_ERROR->{?description}, qr/^Can't modify constant item in read/,
    'read($var, FILE, 1) segfaults on 5.6.1 [ID 20011025.054]' );

# This used to dump core (bug #17920)
eval q{ sub { sub { f1(f2();); my($a,$b,$c) } } };
like( $^EVAL_ERROR->{?description}, qr/error/, 'lexical block discarded by yacc' );

# bug #18573, used to corrupt memory
eval q{ "\c" };
like( $^EVAL_ERROR->{?description}, qr/^Missing control char name in \\c/, q("\c" string) );

eval q{ qq(foo$) };
like( $^EVAL_ERROR->{?description}, qr/Unknown operator '\$'/, q($ at end of "" string) );

# two tests for memory corruption problems in the said variables
# (used to dump core or produce strange results)

is( "\Q\Q\Q\Q\Q\Q\Q\Q\Q\Q\Q\Q\Qa", "a", "PL_lex_casestack" );

try {
do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {
do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {
do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {do {\%(
)};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};
};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};
};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};};
};
is( $^EVAL_ERROR, '', 'PL_lex_brackstack' );

do {
    # tests for bug #20716
    our ($a, @b);
    undef $a;
    undef @b;
    my $a="A";
    is("$($a)\{", "A\{", "interpolation, qq//");
    is("$($a)[", "A[", "interpolation, qq//");
    my @b=@("B");
    is("$(join ' ', @b)\{", "B\{", "interpolation, qq//");
    is(''.qr/$a(?:)\{/, '(?-uxism:A(?:)\{)', "interpolation, qr//");
    my $c = "A\{";
    $c =~ m/$a(?:){/p;
    is($^MATCH, 'A{', "interpolation, m//");
    $c =~ s/$a\{/foo/;
    is($c, 'foo', "interpolation, s/...//");
    $c =~ s/foo/$($a)\{/;
    is($c, 'A{', "interpolation, s//.../");
    is(<<"{$a}{", "A\{ A[ B\{\n", "interpolation, here doc");
$($a)\{ $($a)[ $(join ' ', @b)\{
{$a}{
};

# Bug #21575
# ensure that the second print statement works, by playing a bit
# with the test output.
my %data = %( foo => "\n" );
print $^STDOUT, "#";
print($^STDOUT, 
%data{?foo});
pass();

# Bug #24212
do {
    local $^WARN_HOOK = sub { }; # silence mandatory warning
    eval q{ my $x = -F 1; };
    like( $^EVAL_ERROR->{?description}, qr/(?i:syntax|parse) error .* near "F 1"/, "unknown filetest operators" );
    is(
        eval q{ sub F { 42 } -F 1 },
	'-42',
	'-F calls the F function'
    );
};

# Bug #24762
do {
    eval q{ *foo{CODE} ?? 1 !! 0 };
    is( $^EVAL_ERROR, '', "glob subscript in conditional" );
};

# Bug #25824
do {
    eval q{ sub f { @a=@b=@c;  {use} } };
    like( $^EVAL_ERROR->{?description}, qr/syntax error/, "use without body" );
};

# [perl #2738] perl segfautls on input
do {
    eval q{ sub _ <> {} };
    like($^EVAL_ERROR->{?description}, qr/'>' is reserved for hashes/, "readline operator as prototype");

    eval q{ $s = sub <> {} };
    like($^EVAL_ERROR->{?description}, qr/'>' is reserved for hashes/, "readline operator as prototype");

    eval q{ sub _ __FILE__ {} };
    like($^EVAL_ERROR->{?description}, qr/Illegal declaration of subroutine main::_/, "__FILE__ as prototype");
};

# tests for "Bad name"
eval q{ foo::$bar };
like( $^EVAL_ERROR->{?description}, qr/Bad name after foo::/, 'Bad name after foo::' );

eval q{ s/x/#/ };
is( $^EVAL_ERROR, '', 'comments in s///e' );

# these five used to coredump because the op cleanup on parse error could
# be to the wrong pad

eval q[
    sub { our $a= 1;$a;$a;$a;$a;$a;$a;$a;$a;$a;$a;$a;$a;$a;$a;$a;$a;$a;$a;$a;
	    sub { my $z
];

like($^EVAL_ERROR->{?description}, qr/Missing right curly/, 'nested sub syntax error' );

eval q[
    sub { my ($a,$b,$c,$d,$e,$f,$g,$h,$i,$j,$k,$l,$m,$n,$o,$p,$q,$r,$s,$r);
	    sub { my $z
];
like($^EVAL_ERROR->{?description}, qr/Missing right curly/, 'nested sub syntax error 2' );

eval q[
    sub { our $a= 1;$a;$a;$a;$a;$a;$a;$a;$a;$a;$a;$a;$a;$a;$a;$a;$a;$a;$a;$a;
	    use DieDieDie;
];

like($^EVAL_ERROR->{?description}, qr/Can't locate DieDieDie.pm/, 'croak cleanup' );

eval q[
    sub { my ($a,$b,$c,$d,$e,$f,$g,$h,$i,$j,$k,$l,$m,$n,$o,$p,$q,$r,$s,$r);
	    use DieDieDie;
];

like($^EVAL_ERROR->{?description}, qr/Can't locate DieDieDie.pm/, 'croak cleanup 2' );


# these might leak, or have duplicate frees, depending on the bugginess of
# the parser stack 'fail in reduce' cleanup code. They're here mainly as
# something to be run under valgrind, with PERL_DESTRUCT_LEVEL=1.

eval q[ BEGIN { } ] for 1..10;
is($^EVAL_ERROR, "", 'BEGIN 1' );

eval q[ BEGIN { my $x; $x = 1 } ] for 1..10;
is($^EVAL_ERROR, "", 'BEGIN 2' );

eval q[ sub foo2 { } ] for 1..10;
is($^EVAL_ERROR, "", 'BEGIN 4' );

eval q[ sub foo3 { my $x; $x=1 } ] for 1..10;
is($^EVAL_ERROR, "", 'BEGIN 5' );

eval q[ BEGIN { die } ] for 1..10;
like($^EVAL_ERROR->stacktrace, qr/BEGIN/, 'BEGIN 6' );

eval q[ BEGIN {\&foo4; die } ] for 1..10;
like($^EVAL_ERROR->stacktrace, qr/BEGIN/, 'BEGIN 7' );

# Add new tests HERE:

# More awkward tests for #line. Keep these at the end, as they will screw
# with sane line reporting for any other test failures

sub check($file, $line, $name) {
    my @(_, $got_file, $got_line) =@( caller);
    like ($got_file, $file, "file of $name");
    is ($got_line, $line, "line of $name");
}

#line 3
check(qr/parser\.t$/, 3, "bare line");

# line 5
check(qr/parser\.t$/, 5, "bare line with leading space");

#line 7 
check(qr/parser\.t$/, 7, "trailing space still valid");

# line 11 
check(qr/parser\.t$/, 11, "leading and trailing");

#	line 13
check(qr/parser\.t$/, 13, "leading tab");

#line	17
check(qr/parser\.t$/, 17, "middle tab");

#line                                                                        19
check(qr/parser\.t$/, 19, "loadsaspaces");

#line 23 KASHPRITZA
check(qr/^KASHPRITZA$/, 23, "bare filename");

#line 29 "KAHEEEE"
check(qr/^KAHEEEE$/, 29, "filename in quotes");

#line 31 "CLINK CLOINK BZZT"
check(qr/^CLINK CLOINK BZZT$/, 31, "filename with spaces in quotes");

#line 37 "THOOM	THOOM"
check(qr/^THOOM	THOOM$/, 37, "filename with tabs in quotes");

#line 41 "GLINK PLINK GLUNK DINK" 
check(qr/^GLINK PLINK GLUNK DINK$/, 41, "a space after the quotes");

#line 43 "BBFRPRAFPGHPP
check(qr/^"BBFRPRAFPGHPP$/, 43, "actually missing a quote is still valid");

#line 47 bang eth
check(qr/^"BBFRPRAFPGHPP$/, 46, "but spaces aren't allowed without quotes");

eval <<'EOSTANZA'; die $^EVAL_ERROR if $^EVAL_ERROR;
#line 51 "With wonderful deathless ditties|We build up the world's great cities,|And out of a fabulous story|We fashion an empire's glory:|One man with a dream, at pleasure,|Shall go forth and conquer a crown;|And three with a new song's measure|Can trample a kingdom down."
check(qr/^With.*down\.$/, 51, "Overflow the second small buffer check");
EOSTANZA

# And now, turn on the debugger flag for long names
$^PERLDB = 0x100;

#line 53 "For we are afar with the dawning|And the suns that are not yet high,|And out of the infinite morning|Intrepid you hear us cry-|How, spite of your human scorning,|Once more God's future draws nigh,|And already goes forth the warning|That ye of the past must die."
check(qr/^For we.*must die\.$/, 53, "Our long line is set up");

eval <<'EOT'; die $^EVAL_ERROR if $^EVAL_ERROR;
#line 59 " "
check(qr/^ $/, 59, "Overflow the first small buffer check only");
EOT

eval <<'EOSTANZA'; die $^EVAL_ERROR if $^EVAL_ERROR;
#line 61 "Great hail! we cry to the comers|From the dazzling unknown shore;|Bring us hither your sun and your summers;|And renew our world as of yore;|You shall teach us your song's new numbers,|And things that we dreamed not before:|Yea, in spite of a dreamer who slumbers,|And a singer who sings no more."
check(qr/^Great hail!.*no more\.$/, 61, "Overflow both small buffer checks");
EOSTANZA

do {
    my @x = @( 'string' );
    is(eval q{ "@x[0]->strung" }, 'string->strung',
	'literal -> after an array subscript within ""');
    @x = @( \@('string') );
    # this used to give "string"
    dies_like( sub { "@x[0]-> [0]" }, qr/reference as string/ );
};

__END__
# Don't add new tests HERE. See note above