lex.t

UNIX下perl实现代码

#!./perl

print "1..51\n";

$x = 'x';

print "#1	:$x: eq :x:\n";
if ($x eq 'x') {print "ok 1\n";} else {print "not ok 1\n";}

$x = $#;	# this is the register $#

if ($x eq '') {print "ok 2\n";} else {print "not ok 2\n";}

$x = $#x;

if ($x eq '-1') {print "ok 3\n";} else {print "not ok 3\n";}

$x = '\\'; # ';

if (length($x) == 1) {print "ok 4\n";} else {print "not ok 4\n";}

eval 'while (0) {
    print "foo\n";
}
/^/ && (print "ok 5\n");
';

eval '$foo{1} / 1;';
if (!$@) {print "ok 6\n";} else {print "not ok 6 $@\n";}

eval '$foo = 123+123.4+123e4+123.4E5+123.4e+5+.12;';

$foo = int($foo * 100 + .5);
if ($foo eq 2591024652) {print "ok 7\n";} else {print "not ok 7 :$foo:\n";}

print <<'EOF';
ok 8
EOF

$foo = 'ok 9';
print <<EOF;
$foo
EOF

eval <<\EOE, print $@;
print <<'EOF';
ok 10
EOF

$foo = 'ok 11';
print <<EOF;
$foo
EOF
EOE

print <<`EOS` . <<\EOF;
echo ok 12
EOS
ok 13
EOF

print qq/ok 14\n/;
print qq(ok 15\n);

print qq
[ok 16\n]
;

print q<ok 17
>;

print <<;   # Yow!
ok 18

# previous line intentionally left blank.

print <<E1 eq "foo\n\n" ? "ok 19\n" : "not ok 19\n";
@{[ <<E2 ]}
foo
E2
E1

print <<E1 eq "foo\n\n" ? "ok 20\n" : "not ok 20\n";
@{[
  <<E2
foo
E2
]}
E1

$foo = FOO;
$bar = BAR;
$foo{$bar} = BAZ;
$ary[0] = ABC;

print "$foo{$bar}" eq "BAZ" ? "ok 21\n" : "not ok 21\n";

print "${foo}{$bar}" eq "FOO{BAR}" ? "ok 22\n" : "not ok 22\n";
print "${foo{$bar}}" eq "BAZ" ? "ok 23\n" : "not ok 23\n";

print "FOO:" =~ /$foo[:]/ ? "ok 24\n" : "not ok 24\n";
print "ABC" =~ /^$ary[$A]$/ ? "ok 25\n" : "not ok 25\n";
print "FOOZ" =~ /^$foo[$A-Z]$/ ? "ok 26\n" : "not ok 26\n";

# MJD 19980425
($X, @X) = qw(a b c d); 
print "d" =~ /^$X[-1]$/ ? "ok 27\n" : "not ok 27\n";
print "a1" !~ /^$X[-1]$/ ? "ok 28\n" : "not ok 28\n";

print (((q{{\{\(}} . q{{\)\}}}) eq '{{\(}{\)}}') ? "ok 29\n" : "not ok 29\n");


$foo = "not ok 30\n";
$foo =~ s/^not /substr(<<EOF, 0, 0)/e;
  Ignored
EOF
print $foo;

# Tests for new extended control-character variables
# MJD 19990227

{ my $CX = "\cX";
  my $CXY  ="\cXY";
  $ {$CX} = 17;
  $ {$CXY} = 23;
  if ($ {^XY} != 23) { print "not "  }
  print "ok 31\n";
 
# Does the syntax where we use the literal control character still work?
  if (eval "\$ {\cX}" != 17 or $@) { print "not "  }
  print "ok 32\n";

  eval "\$\cN = 24";                 # Literal control character
  if ($@ or ${"\cN"} != 24) {  print "not "  }
  print "ok 33\n";
  if ($^N != 24) {  print "not "  }  # Control character escape sequence
  print "ok 34\n";

# Does the old UNBRACED syntax still do what it used to?
  if ("$^XY" ne "17Y") { print "not " }
  print "ok 35\n";

  sub XX () { 6 }
  $ {"\cN\cXX"} = 119; 
  $^N = 5; #  This should be an unused ^Var.
  $N = 5;
  # The second caret here should be interpreted as an xor
  if (($^N^XX) != 3) { print "not " } 
  print "ok 36\n";
#  if (($N  ^  XX()) != 3) { print "not " } 
#  print "ok 32\n";

  # These next two tests are trying to make sure that
  # $^FOO is always global; it doesn't make sense to `my' it.
  # 

  eval 'my $^X;';
  print "not " unless index ($@, 'Can\'t use global $^X in "my"') > -1;
  print "ok 37\n";
#  print "($@)\n" if $@;

  eval 'my $ {^XYZ};';
  print "not " unless index ($@, 'Can\'t use global $^XYZ in "my"') > -1;
  print "ok 38\n";
#  print "($@)\n" if $@;

# Now let's make sure that caret variables are all forced into the main package.
  package Someother;
  $^N = 'Someother';
  $ {^Nostril} = 'Someother 2';
  $ {^M} = 'Someother 3';
  package main;
  print "not " unless $^N eq 'Someother';
  print "ok 39\n";
  print "not " unless $ {^Nostril} eq 'Someother 2';
  print "ok 40\n";
  print "not " unless $ {^M} eq 'Someother 3';
  print "ok 41\n";

  
}

# see if eval '', s///e, and heredocs mix

sub T {
    my ($where, $num) = @_;
    my ($p,$f,$l) = caller;
    print "# $p:$f:$l vs /$where/\nnot " unless "$p:$f:$l" =~ /$where/;
    print "ok $num\n";
}

my $test = 42;

{
# line 42 "plink"
    local $_ = "not ok ";
    eval q{
	s/^not /<<EOT/e and T '^main:\(eval \d+\):2$', $test++;
# fuggedaboudit
EOT
        print $_, $test++, "\n";
	T('^main:\(eval \d+\):6$', $test++);
# line 1 "plunk"
	T('^main:plunk:1$', $test++);
    };
    print "# $@\nnot ok $test\n" if $@;
    T '^main:plink:53$', $test++;
}

# tests 47--51 start here
# tests for new array interpolation semantics:
# arrays now *always* interpolate into "..." strings.
# 20000522 MJD ([e-mail])
{
  my $test = 47;
  eval(q(">@nosuch<" eq "><")) || print "# $@", "not ";
  print "ok $test\n";
  ++$test;

  # Look at this!  This is going to be a common error in the future:
  eval(q("[e-mail]" eq "fred.com")) || print "# $@", "not ";
  print "ok $test\n";
  ++$test;

  # Let's make sure that normal array interpolation still works right
  # For some reason, this appears not to be tested anywhere else.
  my @a = (1,2,3);
  print +((">@a<" eq ">1 2 3<") ? '' : 'not '), "ok $test\n";
  ++$test;

  # Ditto.
  eval(q{@nosuch = ('a', 'b', 'c'); ">@nosuch<" eq ">a b c<"}) 
      || print "# $@", "not ";
  print "ok $test\n";
  ++$test;

  # This isn't actually a lex test, but it's testing the same feature
  sub makearray {
    my @array = ('fish', 'dog', 'carrot');
    *R::crackers = \@array;
  }

  eval(q{makearray(); ">@R::crackers<" eq ">fish dog carrot<"})
    || print "# $@", "not ";
  print "ok $test\n";
  ++$test;
}