substr.t

UNIX下perl实现代码

    my $z = 10;
    $z = "21\x{263a}" . $z;
    ok 134, length($z) == 5;
    ok 135, $z eq "21\x{263a}10";
}

# replacement should work on magical values
require Tie::Scalar;
my %data;
tie $data{'a'}, 'Tie::StdScalar';  # makes $data{'a'} magical
$data{a} = "firstlast";
ok 136, substr($data{'a'}, 0, 5, "") eq "first" && $data{'a'} eq "last";

# more utf8

# The following two originally from Ignasi Roca.

$x = "\xF1\xF2\xF3";
substr($x, 0, 1) = "\x{100}"; # Ignasi had \x{FF}
ok 137, length($x) == 3 &&
        $x eq "\x{100}\xF2\xF3" &&
        substr($x, 0, 1) eq "\x{100}" &&
        substr($x, 1, 1) eq "\x{F2}" &&
        substr($x, 2, 1) eq "\x{F3}";

$x = "\xF1\xF2\xF3";
substr($x, 0, 1) = "\x{100}\x{FF}"; # Ignasi had \x{FF}
ok 138, length($x) == 4 &&
        $x eq "\x{100}\x{FF}\xF2\xF3" &&
        substr($x, 0, 1) eq "\x{100}" &&
        substr($x, 1, 1) eq "\x{FF}" &&
        substr($x, 2, 1) eq "\x{F2}" &&
        substr($x, 3, 1) eq "\x{F3}";

# more utf8 lval exercise

$x = "\xF1\xF2\xF3";
substr($x, 0, 2) = "\x{100}\xFF";
ok 139, length($x) == 3 &&
        $x eq "\x{100}\xFF\xF3" &&
        substr($x, 0, 1) eq "\x{100}" &&
        substr($x, 1, 1) eq "\x{FF}" &&
        substr($x, 2, 1) eq "\x{F3}";

$x = "\xF1\xF2\xF3";
substr($x, 1, 1) = "\x{100}\xFF";
ok 140, length($x) == 4 &&
        $x eq "\xF1\x{100}\xFF\xF3" &&
        substr($x, 0, 1) eq "\x{F1}" &&
        substr($x, 1, 1) eq "\x{100}" &&
        substr($x, 2, 1) eq "\x{FF}" &&
        substr($x, 3, 1) eq "\x{F3}";

$x = "\xF1\xF2\xF3";
substr($x, 2, 1) = "\x{100}\xFF";
ok 141, length($x) == 4 &&
        $x eq "\xF1\xF2\x{100}\xFF" &&
        substr($x, 0, 1) eq "\x{F1}" &&
        substr($x, 1, 1) eq "\x{F2}" &&
        substr($x, 2, 1) eq "\x{100}" &&
        substr($x, 3, 1) eq "\x{FF}";

$x = "\xF1\xF2\xF3";
substr($x, 3, 1) = "\x{100}\xFF";
ok 142, length($x) == 5 &&
        $x eq "\xF1\xF2\xF3\x{100}\xFF" &&
        substr($x, 0, 1) eq "\x{F1}" &&
        substr($x, 1, 1) eq "\x{F2}" &&
        substr($x, 2, 1) eq "\x{F3}" &&
        substr($x, 3, 1) eq "\x{100}" &&
        substr($x, 4, 1) eq "\x{FF}";

$x = "\xF1\xF2\xF3";
substr($x, -1, 1) = "\x{100}\xFF";
ok 143, length($x) == 4 &&
        $x eq "\xF1\xF2\x{100}\xFF" &&
        substr($x, 0, 1) eq "\x{F1}" &&
        substr($x, 1, 1) eq "\x{F2}" &&
        substr($x, 2, 1) eq "\x{100}" &&
        substr($x, 3, 1) eq "\x{FF}";

$x = "\xF1\xF2\xF3";
substr($x, -1, 0) = "\x{100}\xFF";
ok 144, length($x) == 5 &&
        $x eq "\xF1\xF2\x{100}\xFF\xF3" &&
        substr($x, 0, 1) eq "\x{F1}" &&
        substr($x, 1, 1) eq "\x{F2}" &&
        substr($x, 2, 1) eq "\x{100}" &&
        substr($x, 3, 1) eq "\x{FF}" &&
        substr($x, 4, 1) eq "\x{F3}";

$x = "\xF1\xF2\xF3";
substr($x, 0, -1) = "\x{100}\xFF";
ok 145, length($x) == 3 &&
        $x eq "\x{100}\xFF\xF3" &&
        substr($x, 0, 1) eq "\x{100}" &&
        substr($x, 1, 1) eq "\x{FF}" &&
        substr($x, 2, 1) eq "\x{F3}";

$x = "\xF1\xF2\xF3";
substr($x, 0, -2) = "\x{100}\xFF";
ok 146, length($x) == 4 &&
        $x eq "\x{100}\xFF\xF2\xF3" &&
        substr($x, 0, 1) eq "\x{100}" &&
        substr($x, 1, 1) eq "\x{FF}" &&
        substr($x, 2, 1) eq "\x{F2}" &&
        substr($x, 3, 1) eq "\x{F3}";

$x = "\xF1\xF2\xF3";
substr($x, 0, -3) = "\x{100}\xFF";
ok 147, length($x) == 5 &&
        $x eq "\x{100}\xFF\xF1\xF2\xF3" &&
        substr($x, 0, 1) eq "\x{100}" &&
        substr($x, 1, 1) eq "\x{FF}" &&
        substr($x, 2, 1) eq "\x{F1}" &&
        substr($x, 3, 1) eq "\x{F2}" &&
        substr($x, 4, 1) eq "\x{F3}";

$x = "\xF1\xF2\xF3";
substr($x, 1, -1) = "\x{100}\xFF";
ok 148, length($x) == 4 &&
        $x eq "\xF1\x{100}\xFF\xF3" &&
        substr($x, 0, 1) eq "\x{F1}" &&
        substr($x, 1, 1) eq "\x{100}" &&
        substr($x, 2, 1) eq "\x{FF}" &&
        substr($x, 3, 1) eq "\x{F3}";

$x = "\xF1\xF2\xF3";
substr($x, -1, -1) = "\x{100}\xFF";
ok 149, length($x) == 5 &&
        $x eq "\xF1\xF2\x{100}\xFF\xF3" &&
        substr($x, 0, 1) eq "\x{F1}" &&
        substr($x, 1, 1) eq "\x{F2}" &&
        substr($x, 2, 1) eq "\x{100}" &&
        substr($x, 3, 1) eq "\x{FF}" &&
        substr($x, 4, 1) eq "\x{F3}";

# And tests for already-UTF8 one

$x = "\x{101}\x{F2}\x{F3}";
substr($x, 0, 1) = "\x{100}";
ok 150, length($x) == 3 &&
        $x eq "\x{100}\xF2\xF3" &&
        substr($x, 0, 1) eq "\x{100}" &&
        substr($x, 1, 1) eq "\x{F2}" &&
        substr($x, 2, 1) eq "\x{F3}";

$x = "\x{101}\x{F2}\x{F3}";
substr($x, 0, 1) = "\x{100}\x{FF}";
ok 151, length($x) == 4 &&
        $x eq "\x{100}\x{FF}\xF2\xF3" &&
        substr($x, 0, 1) eq "\x{100}" &&
        substr($x, 1, 1) eq "\x{FF}" &&
        substr($x, 2, 1) eq "\x{F2}" &&
        substr($x, 3, 1) eq "\x{F3}";

$x = "\x{101}\x{F2}\x{F3}";
substr($x, 0, 2) = "\x{100}\xFF";
ok 152, length($x) == 3 &&
        $x eq "\x{100}\xFF\xF3" &&
        substr($x, 0, 1) eq "\x{100}" &&
        substr($x, 1, 1) eq "\x{FF}" &&
        substr($x, 2, 1) eq "\x{F3}";

$x = "\x{101}\x{F2}\x{F3}";
substr($x, 1, 1) = "\x{100}\xFF";
ok 153, length($x) == 4 &&
        $x eq "\x{101}\x{100}\xFF\xF3" &&
        substr($x, 0, 1) eq "\x{101}" &&
        substr($x, 1, 1) eq "\x{100}" &&
        substr($x, 2, 1) eq "\x{FF}" &&
        substr($x, 3, 1) eq "\x{F3}";

$x = "\x{101}\x{F2}\x{F3}";
substr($x, 2, 1) = "\x{100}\xFF";
ok 154, length($x) == 4 &&
        $x eq "\x{101}\xF2\x{100}\xFF" &&
        substr($x, 0, 1) eq "\x{101}" &&
        substr($x, 1, 1) eq "\x{F2}" &&
        substr($x, 2, 1) eq "\x{100}" &&
        substr($x, 3, 1) eq "\x{FF}";

$x = "\x{101}\x{F2}\x{F3}";
substr($x, 3, 1) = "\x{100}\xFF";
ok 155, length($x) == 5 &&
        $x eq "\x{101}\x{F2}\x{F3}\x{100}\xFF" &&
        substr($x, 0, 1) eq "\x{101}" &&
        substr($x, 1, 1) eq "\x{F2}" &&
        substr($x, 2, 1) eq "\x{F3}" &&
        substr($x, 3, 1) eq "\x{100}" &&
        substr($x, 4, 1) eq "\x{FF}";

$x = "\x{101}\x{F2}\x{F3}";
substr($x, -1, 1) = "\x{100}\xFF";
ok 156, length($x) == 4 &&
        $x eq "\x{101}\xF2\x{100}\xFF" &&
        substr($x, 0, 1) eq "\x{101}" &&
        substr($x, 1, 1) eq "\x{F2}" &&
        substr($x, 2, 1) eq "\x{100}" &&
        substr($x, 3, 1) eq "\x{FF}";

$x = "\x{101}\x{F2}\x{F3}";
substr($x, -1, 0) = "\x{100}\xFF";
ok 157, length($x) == 5 &&
        $x eq "\x{101}\xF2\x{100}\xFF\xF3" &&
        substr($x, 0, 1) eq "\x{101}" &&
        substr($x, 1, 1) eq "\x{F2}" &&
        substr($x, 2, 1) eq "\x{100}" &&
        substr($x, 3, 1) eq "\x{FF}" &&
        substr($x, 4, 1) eq "\x{F3}";

$x = "\x{101}\x{F2}\x{F3}";
substr($x, 0, -1) = "\x{100}\xFF";
ok 158, length($x) == 3 &&
        $x eq "\x{100}\xFF\xF3" &&
        substr($x, 0, 1) eq "\x{100}" &&
        substr($x, 1, 1) eq "\x{FF}" &&
        substr($x, 2, 1) eq "\x{F3}";

$x = "\x{101}\x{F2}\x{F3}";
substr($x, 0, -2) = "\x{100}\xFF";
ok 159, length($x) == 4 &&
        $x eq "\x{100}\xFF\xF2\xF3" &&
        substr($x, 0, 1) eq "\x{100}" &&
        substr($x, 1, 1) eq "\x{FF}" &&
        substr($x, 2, 1) eq "\x{F2}" &&
        substr($x, 3, 1) eq "\x{F3}";

$x = "\x{101}\x{F2}\x{F3}";
substr($x, 0, -3) = "\x{100}\xFF";
ok 160, length($x) == 5 &&
        $x eq "\x{100}\xFF\x{101}\x{F2}\x{F3}" &&
        substr($x, 0, 1) eq "\x{100}" &&
        substr($x, 1, 1) eq "\x{FF}" &&
        substr($x, 2, 1) eq "\x{101}" &&
        substr($x, 3, 1) eq "\x{F2}" &&
        substr($x, 4, 1) eq "\x{F3}";

$x = "\x{101}\x{F2}\x{F3}";
substr($x, 1, -1) = "\x{100}\xFF";
ok 161, length($x) == 4 &&
        $x eq "\x{101}\x{100}\xFF\xF3" &&
        substr($x, 0, 1) eq "\x{101}" &&
        substr($x, 1, 1) eq "\x{100}" &&
        substr($x, 2, 1) eq "\x{FF}" &&
        substr($x, 3, 1) eq "\x{F3}";

$x = "\x{101}\x{F2}\x{F3}";
substr($x, -1, -1) = "\x{100}\xFF";
ok 162, length($x) == 5 &&
        $x eq "\x{101}\xF2\x{100}\xFF\xF3" &&
        substr($x, 0, 1) eq "\x{101}" &&
        substr($x, 1, 1) eq "\x{F2}" &&
        substr($x, 2, 1) eq "\x{100}" &&
        substr($x, 3, 1) eq "\x{FF}" &&
        substr($x, 4, 1) eq "\x{F3}";

substr($x = "ab", 0, 0, "\x{100}\x{200}");
ok 163, $x eq "\x{100}\x{200}ab";

substr($x = "\x{100}\x{200}", 0, 0, "ab");
ok 164, $x eq "ab\x{100}\x{200}";

substr($x = "ab", 1, 0, "\x{100}\x{200}");
ok 165, $x eq "a\x{100}\x{200}b";

substr($x = "\x{100}\x{200}", 1, 0, "ab");
ok 166, $x eq "\x{100}ab\x{200}";

substr($x = "ab", 2, 0, "\x{100}\x{200}");
ok 167, $x eq "ab\x{100}\x{200}";

substr($x = "\x{100}\x{200}", 2, 0, "ab");
ok 168, $x eq "\x{100}\x{200}ab";

substr($x = "\xFFb", 0, 0, "\x{100}\x{200}");
ok 169, $x eq "\x{100}\x{200}\xFFb";

substr($x = "\x{100}\x{200}", 0, 0, "\xFFb");
ok 170, $x eq "\xFFb\x{100}\x{200}";

substr($x = "\xFFb", 1, 0, "\x{100}\x{200}");
ok 171, $x eq "\xFF\x{100}\x{200}b";

substr($x = "\x{100}\x{200}", 1, 0, "\xFFb");
ok 172, $x eq "\x{100}\xFFb\x{200}";

substr($x = "\xFFb", 2, 0, "\x{100}\x{200}");
ok 173, $x eq "\xFFb\x{100}\x{200}";

substr($x = "\x{100}\x{200}", 2, 0, "\xFFb");
ok 174, $x eq "\x{100}\x{200}\xFFb";