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|---|
| 0a753a76 |
1 | #!./perl |
| 2 | # -*- Mode: Perl -*- |
| 3 | # closure.t: |
| 4 | # Original written by Ulrich Pfeifer on 2 Jan 1997. |
| 5 | # Greatly extended by Tom Phoenix <rootbeer@teleport.com> on 28 Jan 1997. |
| 6 | # |
| 7 | |
| 8 | print "1..167\n"; |
| 9 | |
| 10 | my $test = 1; |
| 11 | sub test (&) { |
| 12 | print ((&{$_[0]})?"ok $test\n":"not ok $test\n"); |
| 13 | $test++; |
| 14 | } |
| 15 | |
| 16 | my $i = 1; |
| 17 | sub foo { $i = shift if @_; $i } |
| 18 | |
| 19 | # no closure |
| 20 | test { foo == 1 }; |
| 21 | foo(2); |
| 22 | test { foo == 2 }; |
| 23 | |
| 24 | # closure: lexical outside sub |
| 25 | my $foo = sub {$i = shift if @_; $i }; |
| 26 | my $bar = sub {$i = shift if @_; $i }; |
| 27 | test {&$foo() == 2 }; |
| 28 | &$foo(3); |
| 29 | test {&$foo() == 3 }; |
| 30 | # did the lexical change? |
| 31 | test { foo == 3 and $i == 3}; |
| 32 | # did the second closure notice? |
| 33 | test {&$bar() == 3 }; |
| 34 | |
| 35 | # closure: lexical inside sub |
| 36 | sub bar { |
| 37 | my $i = shift; |
| 38 | sub { $i = shift if @_; $i } |
| 39 | } |
| 40 | |
| 41 | $foo = bar(4); |
| 42 | $bar = bar(5); |
| 43 | test {&$foo() == 4 }; |
| 44 | &$foo(6); |
| 45 | test {&$foo() == 6 }; |
| 46 | test {&$bar() == 5 }; |
| 47 | |
| 48 | # nested closures |
| 49 | sub bizz { |
| 50 | my $i = 7; |
| 51 | if (@_) { |
| 52 | my $i = shift; |
| 53 | sub {$i = shift if @_; $i }; |
| 54 | } else { |
| 55 | my $i = $i; |
| 56 | sub {$i = shift if @_; $i }; |
| 57 | } |
| 58 | } |
| 59 | $foo = bizz(); |
| 60 | $bar = bizz(); |
| 61 | test {&$foo() == 7 }; |
| 62 | &$foo(8); |
| 63 | test {&$foo() == 8 }; |
| 64 | test {&$bar() == 7 }; |
| 65 | |
| 66 | $foo = bizz(9); |
| 67 | $bar = bizz(10); |
| 68 | test {&$foo(11)-1 == &$bar()}; |
| 69 | |
| 70 | my @foo; |
| 71 | for (qw(0 1 2 3 4)) { |
| 72 | my $i = $_; |
| 73 | $foo[$_] = sub {$i = shift if @_; $i }; |
| 74 | } |
| 75 | |
| 76 | test { |
| 77 | &{$foo[0]}() == 0 and |
| 78 | &{$foo[1]}() == 1 and |
| 79 | &{$foo[2]}() == 2 and |
| 80 | &{$foo[3]}() == 3 and |
| 81 | &{$foo[4]}() == 4 |
| 82 | }; |
| 83 | |
| 84 | for (0 .. 4) { |
| 85 | &{$foo[$_]}(4-$_); |
| 86 | } |
| 87 | |
| 88 | test { |
| 89 | &{$foo[0]}() == 4 and |
| 90 | &{$foo[1]}() == 3 and |
| 91 | &{$foo[2]}() == 2 and |
| 92 | &{$foo[3]}() == 1 and |
| 93 | &{$foo[4]}() == 0 |
| 94 | }; |
| 95 | |
| 96 | sub barf { |
| 97 | my @foo; |
| 98 | for (qw(0 1 2 3 4)) { |
| 99 | my $i = $_; |
| 100 | $foo[$_] = sub {$i = shift if @_; $i }; |
| 101 | } |
| 102 | @foo; |
| 103 | } |
| 104 | |
| 105 | @foo = barf(); |
| 106 | test { |
| 107 | &{$foo[0]}() == 0 and |
| 108 | &{$foo[1]}() == 1 and |
| 109 | &{$foo[2]}() == 2 and |
| 110 | &{$foo[3]}() == 3 and |
| 111 | &{$foo[4]}() == 4 |
| 112 | }; |
| 113 | |
| 114 | for (0 .. 4) { |
| 115 | &{$foo[$_]}(4-$_); |
| 116 | } |
| 117 | |
| 118 | test { |
| 119 | &{$foo[0]}() == 4 and |
| 120 | &{$foo[1]}() == 3 and |
| 121 | &{$foo[2]}() == 2 and |
| 122 | &{$foo[3]}() == 1 and |
| 123 | &{$foo[4]}() == 0 |
| 124 | }; |
| 125 | |
| 126 | # Additional tests by Tom Phoenix <rootbeer@teleport.com>. |
| 127 | |
| 128 | { |
| 129 | BEGIN { |
| 130 | if (-d 't') { |
| 131 | unshift @INC, "lib" |
| 132 | } else { |
| 133 | unshift @INC, '../lib' |
| 134 | } |
| 135 | } |
| 136 | use strict; |
| 137 | |
| 138 | use vars qw!$test!; |
| 139 | my($debugging, %expected, $inner_type, $where_declared, $within); |
| 140 | my($nc_attempt, $call_outer, $call_inner, $undef_outer); |
| 141 | my($code, $inner_sub_test, $expected, $line, $errors, $output); |
| 142 | my(@inners, $sub_test, $pid); |
| 143 | $debugging = 1 if defined($ARGV[0]) and $ARGV[0] eq '-debug'; |
| 144 | |
| 145 | # The expected values for these tests |
| 146 | %expected = ( |
| 147 | 'global_scalar' => 1001, |
| 148 | 'global_array' => 2101, |
| 149 | 'global_hash' => 3004, |
| 150 | 'fs_scalar' => 4001, |
| 151 | 'fs_array' => 5101, |
| 152 | 'fs_hash' => 6004, |
| 153 | 'sub_scalar' => 7001, |
| 154 | 'sub_array' => 8101, |
| 155 | 'sub_hash' => 9004, |
| 156 | 'foreach' => 10011, |
| 157 | ); |
| 158 | |
| 159 | # Our innermost sub is either named or anonymous |
| 160 | for $inner_type (qw!named anon!) { |
| 161 | # And it may be declared at filescope, within a named |
| 162 | # sub, or within an anon sub |
| 163 | for $where_declared (qw!filescope in_named in_anon!) { |
| 164 | # And that, in turn, may be within a foreach loop, |
| 165 | # a naked block, or another named sub |
| 166 | for $within (qw!foreach naked other_sub!) { |
| 167 | |
| 168 | # Here are a number of variables which show what's |
| 169 | # going on, in a way. |
| 170 | $nc_attempt = 0+ # Named closure attempted |
| 171 | ( ($inner_type eq 'named') || |
| 172 | ($within eq 'other_sub') ) ; |
| 173 | $call_inner = 0+ # Need to call &inner |
| 174 | ( ($inner_type eq 'anon') && |
| 175 | ($within eq 'other_sub') ) ; |
| 176 | $call_outer = 0+ # Need to call &outer or &$outer |
| 177 | ( ($inner_type eq 'anon') && |
| 178 | ($within ne 'other_sub') ) ; |
| 179 | $undef_outer = 0+ # $outer is created but unused |
| 180 | ( ($where_declared eq 'in_anon') && |
| 181 | (not $call_outer) ) ; |
| 182 | |
| 183 | $code = "# This is a test script built by t/op/closure.t\n\n"; |
| 184 | |
| 185 | $code .= <<"DEBUG_INFO" if $debugging; |
| 186 | # inner_type: $inner_type |
| 187 | # where_declared: $where_declared |
| 188 | # within: $within |
| 189 | # nc_attempt: $nc_attempt |
| 190 | # call_inner: $call_inner |
| 191 | # call_outer: $call_outer |
| 192 | # undef_outer: $undef_outer |
| 193 | DEBUG_INFO |
| 194 | |
| 195 | $code .= <<"END_MARK_ONE"; |
| 196 | |
| 197 | BEGIN { \$SIG{__WARN__} = sub { |
| 198 | my \$msg = \$_[0]; |
| 199 | END_MARK_ONE |
| 200 | |
| 201 | $code .= <<"END_MARK_TWO" if $nc_attempt; |
| 202 | return if index(\$msg, 'will not stay shared') != -1; |
| 203 | return if index(\$msg, 'may be unavailable') != -1; |
| 204 | END_MARK_TWO |
| 205 | |
| 206 | $code .= <<"END_MARK_THREE"; # Backwhack a lot! |
| 207 | print "not ok: got unexpected warning \$msg\\n"; |
| 208 | } } |
| 209 | |
| 210 | { |
| 211 | my \$test = $test; |
| 212 | sub test (&) { |
| 213 | my \$result = &{\$_[0]}; |
| 214 | print "not " unless \$result; |
| 215 | print "ok \$test\\n"; |
| 216 | \$test++; |
| 217 | } |
| 218 | } |
| 219 | |
| 220 | # some of the variables which the closure will access |
| 221 | \$global_scalar = 1000; |
| 222 | \@global_array = (2000, 2100, 2200, 2300); |
| 223 | %global_hash = 3000..3009; |
| 224 | |
| 225 | my \$fs_scalar = 4000; |
| 226 | my \@fs_array = (5000, 5100, 5200, 5300); |
| 227 | my %fs_hash = 6000..6009; |
| 228 | |
| 229 | END_MARK_THREE |
| 230 | |
| 231 | if ($where_declared eq 'filescope') { |
| 232 | # Nothing here |
| 233 | } elsif ($where_declared eq 'in_named') { |
| 234 | $code .= <<'END'; |
| 235 | sub outer { |
| 236 | my $sub_scalar = 7000; |
| 237 | my @sub_array = (8000, 8100, 8200, 8300); |
| 238 | my %sub_hash = 9000..9009; |
| 239 | END |
| 240 | # } |
| 241 | } elsif ($where_declared eq 'in_anon') { |
| 242 | $code .= <<'END'; |
| 243 | $outer = sub { |
| 244 | my $sub_scalar = 7000; |
| 245 | my @sub_array = (8000, 8100, 8200, 8300); |
| 246 | my %sub_hash = 9000..9009; |
| 247 | END |
| 248 | # } |
| 249 | } else { |
| 250 | die "What was $where_declared?" |
| 251 | } |
| 252 | |
| 253 | if ($within eq 'foreach') { |
| 254 | $code .= " |
| 255 | my \$foreach = 12000; |
| 256 | my \@list = (10000, 10010); |
| 257 | foreach \$foreach (\@list) { |
| 258 | " # } |
| 259 | } elsif ($within eq 'naked') { |
| 260 | $code .= " { # naked block\n" # } |
| 261 | } elsif ($within eq 'other_sub') { |
| 262 | $code .= " sub inner_sub {\n" # } |
| 263 | } else { |
| 264 | die "What was $within?" |
| 265 | } |
| 266 | |
| 267 | $sub_test = $test; |
| 268 | @inners = ( qw!global_scalar global_array global_hash! , |
| 269 | qw!fs_scalar fs_array fs_hash! ); |
| 270 | push @inners, 'foreach' if $within eq 'foreach'; |
| 271 | if ($where_declared ne 'filescope') { |
| 272 | push @inners, qw!sub_scalar sub_array sub_hash!; |
| 273 | } |
| 274 | for $inner_sub_test (@inners) { |
| 275 | |
| 276 | if ($inner_type eq 'named') { |
| 277 | $code .= " sub named_$sub_test " |
| 278 | } elsif ($inner_type eq 'anon') { |
| 279 | $code .= " \$anon_$sub_test = sub " |
| 280 | } else { |
| 281 | die "What was $inner_type?" |
| 282 | } |
| 283 | |
| 284 | # Now to write the body of the test sub |
| 285 | if ($inner_sub_test eq 'global_scalar') { |
| 286 | $code .= '{ ++$global_scalar }' |
| 287 | } elsif ($inner_sub_test eq 'fs_scalar') { |
| 288 | $code .= '{ ++$fs_scalar }' |
| 289 | } elsif ($inner_sub_test eq 'sub_scalar') { |
| 290 | $code .= '{ ++$sub_scalar }' |
| 291 | } elsif ($inner_sub_test eq 'global_array') { |
| 292 | $code .= '{ ++$global_array[1] }' |
| 293 | } elsif ($inner_sub_test eq 'fs_array') { |
| 294 | $code .= '{ ++$fs_array[1] }' |
| 295 | } elsif ($inner_sub_test eq 'sub_array') { |
| 296 | $code .= '{ ++$sub_array[1] }' |
| 297 | } elsif ($inner_sub_test eq 'global_hash') { |
| 298 | $code .= '{ ++$global_hash{3002} }' |
| 299 | } elsif ($inner_sub_test eq 'fs_hash') { |
| 300 | $code .= '{ ++$fs_hash{6002} }' |
| 301 | } elsif ($inner_sub_test eq 'sub_hash') { |
| 302 | $code .= '{ ++$sub_hash{9002} }' |
| 303 | } elsif ($inner_sub_test eq 'foreach') { |
| 304 | $code .= '{ ++$foreach }' |
| 305 | } else { |
| 306 | die "What was $inner_sub_test?" |
| 307 | } |
| 308 | |
| 309 | # Close up |
| 310 | if ($inner_type eq 'anon') { |
| 311 | $code .= ';' |
| 312 | } |
| 313 | $code .= "\n"; |
| 314 | $sub_test++; # sub name sequence number |
| 315 | |
| 316 | } # End of foreach $inner_sub_test |
| 317 | |
| 318 | # Close up $within block # { |
| 319 | $code .= " }\n\n"; |
| 320 | |
| 321 | # Close up $where_declared block |
| 322 | if ($where_declared eq 'in_named') { # { |
| 323 | $code .= "}\n\n"; |
| 324 | } elsif ($where_declared eq 'in_anon') { # { |
| 325 | $code .= "};\n\n"; |
| 326 | } |
| 327 | |
| 328 | # We may need to do something with the sub we just made... |
| 329 | $code .= "undef \$outer;\n" if $undef_outer; |
| 330 | $code .= "&inner_sub;\n" if $call_inner; |
| 331 | if ($call_outer) { |
| 332 | if ($where_declared eq 'in_named') { |
| 333 | $code .= "&outer;\n\n"; |
| 334 | } elsif ($where_declared eq 'in_anon') { |
| 335 | $code .= "&\$outer;\n\n" |
| 336 | } |
| 337 | } |
| 338 | |
| 339 | # Now, we can actually prep to run the tests. |
| 340 | for $inner_sub_test (@inners) { |
| 341 | $expected = $expected{$inner_sub_test} or |
| 342 | die "expected $inner_sub_test missing"; |
| 343 | |
| 344 | # Named closures won't access the expected vars |
| 345 | if ( $nc_attempt and |
| 346 | substr($inner_sub_test, 0, 4) eq "sub_" ) { |
| 347 | $expected = 1; |
| 348 | } |
| 349 | |
| 350 | # If you make a sub within a foreach loop, |
| 351 | # what happens if it tries to access the |
| 352 | # foreach index variable? If it's a named |
| 353 | # sub, it gets the var from "outside" the loop, |
| 354 | # but if it's anon, it gets the value to which |
| 355 | # the index variable is aliased. |
| 356 | # |
| 357 | # Of course, if the value was set only |
| 358 | # within another sub which was never called, |
| 359 | # the value has not been set yet. |
| 360 | # |
| 361 | if ($inner_sub_test eq 'foreach') { |
| 362 | if ($inner_type eq 'named') { |
| 363 | if ($call_outer || ($where_declared eq 'filescope')) { |
| 364 | $expected = 12001 |
| 365 | } else { |
| 366 | $expected = 1 |
| 367 | } |
| 368 | } |
| 369 | } |
| 370 | |
| 371 | # Here's the test: |
| 372 | if ($inner_type eq 'anon') { |
| 373 | $code .= "test { &\$anon_$test == $expected };\n" |
| 374 | } else { |
| 375 | $code .= "test { &named_$test == $expected };\n" |
| 376 | } |
| 377 | $test++; |
| 378 | } |
| 379 | |
| 380 | # Fork off a new perl to run the tests. |
| 381 | # (This is so we can catch spurious warnings.) |
| 382 | $| = 1; print ""; $| = 0; # flush output before forking |
| 383 | pipe READ, WRITE or die "Can't make pipe: $!"; |
| 384 | pipe READ2, WRITE2 or die "Can't make second pipe: $!"; |
| 385 | die "Can't fork: $!" unless defined($pid = open PERL, "|-"); |
| 386 | unless ($pid) { |
| 387 | # Child process here. We're going to send errors back |
| 388 | # through the extra pipe. |
| 389 | close READ; |
| 390 | close READ2; |
| 391 | open STDOUT, ">&WRITE" or die "Can't redirect STDOUT: $!"; |
| 392 | open STDERR, ">&WRITE2" or die "Can't redirect STDERR: $!"; |
| 393 | exec './perl', '-w', '-' |
| 394 | or die "Can't exec ./perl: $!"; |
| 395 | } |
| 396 | # Parent process here. |
| 397 | close WRITE; |
| 398 | close WRITE2; |
| 399 | print PERL $code; |
| 400 | close PERL; |
| 401 | $output = join '', <READ>; |
| 402 | $errors = join '', <READ2>; |
| 403 | print $output, $errors; |
| 404 | if ($debugging && ($errors || $? || ($output =~ /not ok/))) { |
| 405 | my $lnum = 0; |
| 406 | for $line (split '\n', $code) { |
| 407 | printf "%3d: %s\n", ++$lnum, $line; |
| 408 | } |
| 409 | } |
| 410 | printf "not ok: exited with error code %04lX\n",$? if $?; |
| 411 | print "-" x 30, $/ if $debugging; |
| 412 | |
| 413 | } # End of foreach $within |
| 414 | } # End of foreach $where_declared |
| 415 | } # End of foreach $inner_type |
| 416 | |
| 417 | } |
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