#!./perl
BEGIN {
chdir 't' if -d 't';
@INC = '../lib';
}
use strict;
use warnings;
use Test::More tests => 107;
# The behaviour of the feature pragma should be tested by lib/switch.t
# using the tests in t/lib/switch/*. This file tests the behaviour of
# the switch ops themselves.
use feature 'switch';
no warnings "numeric";
eval { continue };
like($@, qr/^Can't "continue" outside/, "continue outside");
eval { break };
like($@, qr/^Can't "break" outside/, "break outside");
# Scoping rules
{
my $x = "foo";
given(my $x = "bar") {
is($x, "bar", "given scope starts");
}
is($x, "foo", "given scope ends");
}
sub be_true {1}
given(my $x = "foo") {
when(be_true(my $x = "bar")) {
is($x, "bar", "given scope starts");
}
is($x, "foo", "given scope ends");
}
$_ = "outside";
given("inside") { check_outside1() }
sub check_outside1 { is($_, "outside", "\$_ lexically scoped") }
{
my $_ = "outside";
given("inside") { check_outside2() }
sub check_outside2 {
is($_, "outside", "\$_ lexically scoped (lexical \$_)")
}
}
# Basic string/numeric comparisons and control flow
{
my $ok;
given(3) {
when(2) { $ok = 'two'; }
when(3) { $ok = 'three'; }
when(4) { $ok = 'four'; }
default { $ok = 'd'; }
}
is($ok, 'three', "numeric comparison");
}
{
my $ok;
use integer;
given(3.14159265) {
when(2) { $ok = 'two'; }
when(3) { $ok = 'three'; }
when(4) { $ok = 'four'; }
default { $ok = 'd'; }
}
is($ok, 'three', "integer comparison");
}
{
my ($ok1, $ok2);
given(3) {
when(3.1) { $ok1 = 'n'; }
when(3.0) { $ok1 = 'y'; continue }
when("3.0") { $ok2 = 'y'; }
default { $ok2 = 'n'; }
}
is($ok1, 'y', "more numeric (pt. 1)");
is($ok2, 'y', "more numeric (pt. 2)");
}
{
my $ok;
given("c") {
when("b") { $ok = 'B'; }
when("c") { $ok = 'C'; }
when("d") { $ok = 'D'; }
default { $ok = 'def'; }
}
is($ok, 'C', "string comparison");
}
{
my $ok;
given("c") {
when("b") { $ok = 'B'; }
when("c") { $ok = 'C'; continue }
when("c") { $ok = 'CC'; }
default { $ok = 'D'; }
}
is($ok, 'CC', "simple continue");
}
# Definedness
{
my $ok = 1;
given (0) { when(undef) {$ok = 0} }
is($ok, 1, "Given(0) when(undef)");
}
{
my $undef;
my $ok = 1;
given (0) { when($undef) {$ok = 0} }
is($ok, 1, 'Given(0) when($undef)');
}
{
my $undef;
my $ok = 0;
given (0) { when($undef++) {$ok = 1} }
is($ok, 1, "Given(0) when($undef++)");
}
{
my $ok = 1;
given (undef) { when(0) {$ok = 0} }
is($ok, 1, "Given(undef) when(0)");
}
{
my $undef;
my $ok = 1;
given ($undef) { when(0) {$ok = 0} }
is($ok, 1, 'Given($undef) when(0)');
}
########
{
my $ok = 1;
given ("") { when(undef) {$ok = 0} }
is($ok, 1, 'Given("") when(undef)');
}
{
my $undef;
my $ok = 1;
given ("") { when($undef) {$ok = 0} }
is($ok, 1, 'Given("") when($undef)');
}
{
my $ok = 1;
given (undef) { when("") {$ok = 0} }
is($ok, 1, 'Given(undef) when("")');
}
{
my $undef;
my $ok = 1;
given ($undef) { when("") {$ok = 0} }
is($ok, 1, 'Given($undef) when("")');
}
########
{
my $ok = 0;
given (undef) { when(undef) {$ok = 1} }
is($ok, 1, "Given(undef) when(undef)");
}
{
my $undef;
my $ok = 0;
given (undef) { when($undef) {$ok = 1} }
is($ok, 1, 'Given(undef) when($undef)');
}
{
my $undef;
my $ok = 0;
given ($undef) { when(undef) {$ok = 1} }
is($ok, 1, 'Given($undef) when(undef)');
}
{
my $undef;
my $ok = 0;
given ($undef) { when($undef) {$ok = 1} }
is($ok, 1, 'Given($undef) when($undef)');
}
# Regular expressions
{
my ($ok1, $ok2);
given("Hello, world!") {
when(/lo/)
{ $ok1 = 'y'; continue}
when(/no/)
{ $ok1 = 'n'; continue}
when(/^(Hello,|Goodbye cruel) world[!.?]/)
{ $ok2 = 'Y'; continue}
when(/^(Hello cruel|Goodbye,) world[!.?]/)
{ $ok2 = 'n'; continue}
}
is($ok1, 'y', "regex 1");
is($ok2, 'Y', "regex 2");
}
# Comparisons
{
my $test = "explicit numeric comparison (<)";
my $twenty_five = 25;
my $ok;
given($twenty_five) {
when ($_ < 10) { $ok = "ten" }
when ($_ < 20) { $ok = "twenty" }
when ($_ < 30) { $ok = "thirty" }
when ($_ < 40) { $ok = "forty" }
default { $ok = "default" }
}
is($ok, "thirty", $test);
}
{
use integer;
my $test = "explicit numeric comparison (integer <)";
my $twenty_five = 25;
my $ok;
given($twenty_five) {
when ($_ < 10) { $ok = "ten" }
when ($_ < 20) { $ok = "twenty" }
when ($_ < 30) { $ok = "thirty" }
when ($_ < 40) { $ok = "forty" }
default { $ok = "default" }
}
is($ok, "thirty", $test);
}
{
my $test = "explicit numeric comparison (<=)";
my $twenty_five = 25;
my $ok;
given($twenty_five) {
when ($_ <= 10) { $ok = "ten" }
when ($_ <= 20) { $ok = "twenty" }
when ($_ <= 30) { $ok = "thirty" }
when ($_ <= 40) { $ok = "forty" }
default { $ok = "default" }
}
is($ok, "thirty", $test);
}
{
use integer;
my $test = "explicit numeric comparison (integer <=)";
my $twenty_five = 25;
my $ok;
given($twenty_five) {
when ($_ <= 10) { $ok = "ten" }
when ($_ <= 20) { $ok = "twenty" }
when ($_ <= 30) { $ok = "thirty" }
when ($_ <= 40) { $ok = "forty" }
default { $ok = "default" }
}
is($ok, "thirty", $test);
}
{
my $test = "explicit numeric comparison (>)";
my $twenty_five = 25;
my $ok;
given($twenty_five) {
when ($_ > 40) { $ok = "forty" }
when ($_ > 30) { $ok = "thirty" }
when ($_ > 20) { $ok = "twenty" }
when ($_ > 10) { $ok = "ten" }
default { $ok = "default" }
}
is($ok, "twenty", $test);
}
{
my $test = "explicit numeric comparison (>=)";
my $twenty_five = 25;
my $ok;
given($twenty_five) {
when ($_ >= 40) { $ok = "forty" }
when ($_ >= 30) { $ok = "thirty" }
when ($_ >= 20) { $ok = "twenty" }
when ($_ >= 10) { $ok = "ten" }
default { $ok = "default" }
}
is($ok, "twenty", $test);
}
{
use integer;
my $test = "explicit numeric comparison (integer >)";
my $twenty_five = 25;
my $ok;
given($twenty_five) {
when ($_ > 40) { $ok = "forty" }
when ($_ > 30) { $ok = "thirty" }
when ($_ > 20) { $ok = "twenty" }
when ($_ > 10) { $ok = "ten" }
default { $ok = "default" }
}
is($ok, "twenty", $test);
}
{
use integer;
my $test = "explicit numeric comparison (integer >=)";
my $twenty_five = 25;
my $ok;
given($twenty_five) {
when ($_ >= 40) { $ok = "forty" }
when ($_ >= 30) { $ok = "thirty" }
when ($_ >= 20) { $ok = "twenty" }
when ($_ >= 10) { $ok = "ten" }
default { $ok = "default" }
}
is($ok, "twenty", $test);
}
{
my $test = "explicit string comparison (lt)";
my $twenty_five = "25";
my $ok;
given($twenty_five) {
when ($_ lt "10") { $ok = "ten" }
when ($_ lt "20") { $ok = "twenty" }
when ($_ lt "30") { $ok = "thirty" }
when ($_ lt "40") { $ok = "forty" }
default { $ok = "default" }
}
is($ok, "thirty", $test);
}
{
my $test = "explicit string comparison (le)";
my $twenty_five = "25";
my $ok;
given($twenty_five) {
when ($_ le "10") { $ok = "ten" }
when ($_ le "20") { $ok = "twenty" }
when ($_ le "30") { $ok = "thirty" }
when ($_ le "40") { $ok = "forty" }
default { $ok = "default" }
}
is($ok, "thirty", $test);
}
{
my $test = "explicit string comparison (gt)";
my $twenty_five = 25;
my $ok;
given($twenty_five) {
when ($_ ge "40") { $ok = "forty" }
when ($_ ge "30") { $ok = "thirty" }
when ($_ ge "20") { $ok = "twenty" }
when ($_ ge "10") { $ok = "ten" }
default { $ok = "default" }
}
is($ok, "twenty", $test);
}
{
my $test = "explicit string comparison (ge)";
my $twenty_five = 25;
my $ok;
given($twenty_five) {
when ($_ ge "40") { $ok = "forty" }
when ($_ ge "30") { $ok = "thirty" }
when ($_ ge "20") { $ok = "twenty" }
when ($_ ge "10") { $ok = "ten" }
default { $ok = "default" }
}
is($ok, "twenty", $test);
}
# Make sure it still works with a lexical $_:
{
my $_;
my $test = "explicit comparison with lexical \$_";
my $twenty_five = 25;
my $ok;
given($twenty_five) {
when ($_ ge "40") { $ok = "forty" }
when ($_ ge "30") { $ok = "thirty" }
when ($_ ge "20") { $ok = "twenty" }
when ($_ ge "10") { $ok = "ten" }
default { $ok = "default" }
}
is($ok, "twenty", $test);
}
# Optimized-away comparisons
{
my $ok;
given(23) {
when (2 + 2 == 4) { $ok = 'y'; continue }
when (2 + 2 == 5) { $ok = 'n' }
}
is($ok, 'y', "Optimized-away comparison");
}
# File tests
# (How to be both thorough and portable? Pinch a few ideas
# from t/op/filetest.t. We err on the side of portability for
# the time being.)
{
my ($ok_d, $ok_f, $ok_r);
given("op") {
when(-d) {$ok_d = 1; continue}
when(!-f) {$ok_f = 1; continue}
when(-r) {$ok_r = 1; continue}
}
ok($ok_d, "Filetest -d");
ok($ok_f, "Filetest -f");
ok($ok_r, "Filetest -r");
}
# Sub and method calls
sub bar {"bar"}
{
my $ok = 0;
given("foo") {
when(bar()) {$ok = 1}
}
ok($ok, "Sub call acts as boolean")
}
{
my $ok = 0;
given("foo") {
when(main->bar()) {$ok = 1}
}
ok($ok, "Class-method call acts as boolean")
}
{
my $ok = 0;
my $obj = bless [];
given("foo") {
when($obj->bar()) {$ok = 1}
}
ok($ok, "Object-method call acts as boolean")
}
# Other things that should not be smart matched
{
my $ok = 0;
given(0) {
when(eof(DATA)) {
$ok = 1;
}
}
ok($ok, "eof() not smartmatched");
}
{
my $ok = 0;
my %foo = ("bar", 0);
given(0) {
when(exists $foo{bar}) {
$ok = 1;
}
}
ok($ok, "exists() not smartmatched");
}
{
my $ok = 0;
given(0) {
when(defined $ok) {
$ok = 1;
}
}
ok($ok, "defined() not smartmatched");
}
{
my $ok = 1;
given("foo") {
when((1 == 1) && "bar") {
$ok = 0;
}
when((1 == 1) && $_ eq "foo") {
$ok = 2;
}
}
is($ok, 2, "((1 == 1) && \"bar\") not smartmatched");
}
{
my $ok = 1;
given(0) {
when((1 == $ok) || "foo") {
$ok = 0;
}
}
ok($ok, '((1 == $ok) || "foo") not smartmatched');
}
# Make sure we aren't invoking the get-magic more than once
{ # A helper class to count the number of accesses.
package FetchCounter;
sub TIESCALAR {
my ($class) = @_;
bless {value => undef, count => 0}, $class;
}
sub STORE {
my ($self, $val) = @_;
$self->{count} = 0;
$self->{value} = $val;
}
sub FETCH {
my ($self) = @_;
# Avoid pre/post increment here
$self->{count} = 1 + $self->{count};
$self->{value};
}
sub count {
my ($self) = @_;
$self->{count};
}
}
my $f = tie my $v, "FetchCounter";
{ my $test_name = "Only one FETCH (in given)";
my $ok;
given($v = 23) {
when(undef) {}
when(sub{0}->()) {}
when(21) {}
when("22") {}
when(23) {$ok = 1}
when(/24/) {$ok = 0}
}
is($ok, 1, "precheck: $test_name");
is($f->count(), 1, $test_name);
}
{ my $test_name = "Only one FETCH (numeric when)";
my $ok;
$v = 23;
is($f->count(), 0, "Sanity check: $test_name");
given(23) {
when(undef) {}
when(sub{0}->()) {}
when(21) {}
when("22") {}
when($v) {$ok = 1}
when(/24/) {$ok = 0}
}
is($ok, 1, "precheck: $test_name");
is($f->count(), 1, $test_name);
}
{ my $test_name = "Only one FETCH (string when)";
my $ok;
$v = "23";
is($f->count(), 0, "Sanity check: $test_name");
given("23") {
when(undef) {}
when(sub{0}->()) {}
when("21") {}
when("22") {}
when($v) {$ok = 1}
when(/24/) {$ok = 0}
}
is($ok, 1, "precheck: $test_name");
is($f->count(), 1, $test_name);
}
{ my $test_name = "Only one FETCH (undef)";
my $ok;
$v = undef;
is($f->count(), 0, "Sanity check: $test_name");
given(my $undef) {
when(sub{0}->()) {}
when("21") {}
when("22") {}
when($v) {$ok = 1}
when(undef) {$ok = 0}
}
is($ok, 1, "precheck: $test_name");
is($f->count(), 1, $test_name);
}
# Loop topicalizer
{
my $first = 1;
for (1, "two") {
when ("two") {
is($first, 0, "Loop: second");
eval {break};
like($@, qr/^Can't "break" in a loop topicalizer/,
q{Can't "break" in a loop topicalizer});
}
when (1) {
is($first, 1, "Loop: first");
$first = 0;
# Implicit break is okay
}
}
}
{
my $first = 1;
for $_ (1, "two") {
when ("two") {
is($first, 0, "Explicit \$_: second");
eval {break};
like($@, qr/^Can't "break" in a loop topicalizer/,
q{Can't "break" in a loop topicalizer});
}
when (1) {
is($first, 1, "Explicit \$_: first");
$first = 0;
# Implicit break is okay
}
}
}
{
my $first = 1;
my $_;
for (1, "two") {
when ("two") {
is($first, 0, "Implicitly lexical loop: second");
eval {break};
like($@, qr/^Can't "break" in a loop topicalizer/,
q{Can't "break" in a loop topicalizer});
}
when (1) {
is($first, 1, "Implicitly lexical loop: first");
$first = 0;
# Implicit break is okay
}
}
}
{
my $first = 1;
my $_;
for $_ (1, "two") {
when ("two") {
is($first, 0, "Implicitly lexical, explicit \$_: second");
eval {break};
like($@, qr/^Can't "break" in a loop topicalizer/,
q{Can't "break" in a loop topicalizer});
}
when (1) {
is($first, 1, "Implicitly lexical, explicit \$_: first");
$first = 0;
# Implicit break is okay
}
}
}
{
my $first = 1;
for my $_ (1, "two") {
when ("two") {
is($first, 0, "Lexical loop: second");
eval {break};
like($@, qr/^Can't "break" in a loop topicalizer/,
q{Can't "break" in a loop topicalizer});
}
when (1) {
is($first, 1, "Lecical loop: first");
$first = 0;
# Implicit break is okay
}
}
}
# Code references
{
no warnings "redefine";
my $called_foo = 0;
sub foo {$called_foo = 1}
my $called_bar = 0;
sub bar {$called_bar = 1}
my ($matched_foo, $matched_bar) = (0, 0);
given(\&foo) {
when(\&bar) {$matched_bar = 1}
when(\&foo) {$matched_foo = 1}
}
is($called_foo, 0, "Code ref comparison: foo not called");
is($called_bar, 0, "Code ref comparison: bar not called");
is($matched_bar, 0, "Code ref didn't match different one");
is($matched_foo, 1, "Code ref did match itself");
}
sub contains_x {
my $x = shift;
return ($x =~ /x/);
}
{
my ($ok1, $ok2) = (0,0);
given("foxy!") {
when(contains_x($_))
{ $ok1 = 1; continue }
when(\&contains_x)
{ $ok2 = 1; continue }
}
is($ok1, 1, "Calling sub directly (true)");
is($ok2, 1, "Calling sub indirectly (true)");
given("foggy") {
when(contains_x($_))
{ $ok1 = 2; continue }
when(\&contains_x)
{ $ok2 = 2; continue }
}
is($ok1, 1, "Calling sub directly (false)");
is($ok2, 1, "Calling sub indirectly (false)");
}
# Test overloading
{ package OverloadTest;
use overload '""' => sub{"string value of obj"};
use overload "~~" => sub {
my ($self, $other, $reversed) = @_;
if ($reversed) {
$self->{left} = $other;
$self->{right} = $self;
$self->{reversed} = 1;
} else {
$self->{left} = $self;
$self->{right} = $other;
$self->{reversed} = 0;
}
$self->{called} = 1;
return $self->{retval};
};
sub new {
my ($pkg, $retval) = @_;
bless {
called => 0,
retval => $retval,
}, $pkg;
}
}
{
my $test = "Overloaded obj in given (true)";
my $obj = OverloadTest->new(1);
my $matched;
given($obj) {
when ("other arg") {$matched = 1}
default {$matched = 0}
}
is($obj->{called}, 1, "$test: called");
ok($matched, "$test: matched");
is($obj->{left}, "string value of obj", "$test: left");
is($obj->{right}, "other arg", "$test: right");
ok(!$obj->{reversed}, "$test: not reversed");
}
{
my $test = "Overloaded obj in given (false)";
my $obj = OverloadTest->new(0);
my $matched;
given($obj) {
when ("other arg") {$matched = 1}
}
is($obj->{called}, 1, "$test: called");
ok(!$matched, "$test: not matched");
is($obj->{left}, "string value of obj", "$test: left");
is($obj->{right}, "other arg", "$test: right");
ok(!$obj->{reversed}, "$test: not reversed");
}
{
my $test = "Overloaded obj in when (true)";
my $obj = OverloadTest->new(1);
my $matched;
given("topic") {
when ($obj) {$matched = 1}
default {$matched = 0}
}
is($obj->{called}, 1, "$test: called");
ok($matched, "$test: matched");
is($obj->{left}, "topic", "$test: left");
is($obj->{right}, "string value of obj", "$test: right");
ok($obj->{reversed}, "$test: reversed");
}
{
my $test = "Overloaded obj in when (false)";
my $obj = OverloadTest->new(0);
my $matched;
given("topic") {
when ($obj) {$matched = 1}
default {$matched = 0}
}
is($obj->{called}, 1, "$test: called");
ok(!$matched, "$test: not matched");
is($obj->{left}, "topic", "$test: left");
is($obj->{right}, "string value of obj", "$test: right");
ok($obj->{reversed}, "$test: reversed");
}
# Okay, that'll do for now. The intricacies of the smartmatch
# semantics are tested in t/op/smartmatch.t
__END__