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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 | |
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8 | BEGIN { |
9 | chdir 't' if -d 't'; |
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10 | unshift @INC, '../lib'; |
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11 | } |
12 | |
13 | use Config; |
14 | |
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15 | print "1..169\n"; |
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16 | |
17 | my $test = 1; |
18 | sub test (&) { |
19 | print ((&{$_[0]})?"ok $test\n":"not ok $test\n"); |
20 | $test++; |
21 | } |
22 | |
23 | my $i = 1; |
24 | sub foo { $i = shift if @_; $i } |
25 | |
26 | # no closure |
27 | test { foo == 1 }; |
28 | foo(2); |
29 | test { foo == 2 }; |
30 | |
31 | # closure: lexical outside sub |
32 | my $foo = sub {$i = shift if @_; $i }; |
33 | my $bar = sub {$i = shift if @_; $i }; |
34 | test {&$foo() == 2 }; |
35 | &$foo(3); |
36 | test {&$foo() == 3 }; |
37 | # did the lexical change? |
38 | test { foo == 3 and $i == 3}; |
39 | # did the second closure notice? |
40 | test {&$bar() == 3 }; |
41 | |
42 | # closure: lexical inside sub |
43 | sub bar { |
44 | my $i = shift; |
45 | sub { $i = shift if @_; $i } |
46 | } |
47 | |
48 | $foo = bar(4); |
49 | $bar = bar(5); |
50 | test {&$foo() == 4 }; |
51 | &$foo(6); |
52 | test {&$foo() == 6 }; |
53 | test {&$bar() == 5 }; |
54 | |
55 | # nested closures |
56 | sub bizz { |
57 | my $i = 7; |
58 | if (@_) { |
59 | my $i = shift; |
60 | sub {$i = shift if @_; $i }; |
61 | } else { |
62 | my $i = $i; |
63 | sub {$i = shift if @_; $i }; |
64 | } |
65 | } |
66 | $foo = bizz(); |
67 | $bar = bizz(); |
68 | test {&$foo() == 7 }; |
69 | &$foo(8); |
70 | test {&$foo() == 8 }; |
71 | test {&$bar() == 7 }; |
72 | |
73 | $foo = bizz(9); |
74 | $bar = bizz(10); |
75 | test {&$foo(11)-1 == &$bar()}; |
76 | |
77 | my @foo; |
78 | for (qw(0 1 2 3 4)) { |
79 | my $i = $_; |
80 | $foo[$_] = sub {$i = shift if @_; $i }; |
81 | } |
82 | |
83 | test { |
84 | &{$foo[0]}() == 0 and |
85 | &{$foo[1]}() == 1 and |
86 | &{$foo[2]}() == 2 and |
87 | &{$foo[3]}() == 3 and |
88 | &{$foo[4]}() == 4 |
89 | }; |
90 | |
91 | for (0 .. 4) { |
92 | &{$foo[$_]}(4-$_); |
93 | } |
94 | |
95 | test { |
96 | &{$foo[0]}() == 4 and |
97 | &{$foo[1]}() == 3 and |
98 | &{$foo[2]}() == 2 and |
99 | &{$foo[3]}() == 1 and |
100 | &{$foo[4]}() == 0 |
101 | }; |
102 | |
103 | sub barf { |
104 | my @foo; |
105 | for (qw(0 1 2 3 4)) { |
106 | my $i = $_; |
107 | $foo[$_] = sub {$i = shift if @_; $i }; |
108 | } |
109 | @foo; |
110 | } |
111 | |
112 | @foo = barf(); |
113 | test { |
114 | &{$foo[0]}() == 0 and |
115 | &{$foo[1]}() == 1 and |
116 | &{$foo[2]}() == 2 and |
117 | &{$foo[3]}() == 3 and |
118 | &{$foo[4]}() == 4 |
119 | }; |
120 | |
121 | for (0 .. 4) { |
122 | &{$foo[$_]}(4-$_); |
123 | } |
124 | |
125 | test { |
126 | &{$foo[0]}() == 4 and |
127 | &{$foo[1]}() == 3 and |
128 | &{$foo[2]}() == 2 and |
129 | &{$foo[3]}() == 1 and |
130 | &{$foo[4]}() == 0 |
131 | }; |
132 | |
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133 | # test if closures get created in optimized for loops |
134 | |
135 | my %foo; |
136 | for my $n ('A'..'E') { |
137 | $foo{$n} = sub { $n eq $_[0] }; |
138 | } |
139 | |
140 | test { |
141 | &{$foo{A}}('A') and |
142 | &{$foo{B}}('B') and |
143 | &{$foo{C}}('C') and |
144 | &{$foo{D}}('D') and |
145 | &{$foo{E}}('E') |
146 | }; |
147 | |
148 | for my $n (0..4) { |
149 | $foo[$n] = sub { $n == $_[0] }; |
150 | } |
151 | |
152 | test { |
153 | &{$foo[0]}(0) and |
154 | &{$foo[1]}(1) and |
155 | &{$foo[2]}(2) and |
156 | &{$foo[3]}(3) and |
157 | &{$foo[4]}(4) |
158 | }; |
159 | |
0a753a76 |
160 | # Additional tests by Tom Phoenix <rootbeer@teleport.com>. |
161 | |
162 | { |
0a753a76 |
163 | use strict; |
164 | |
165 | use vars qw!$test!; |
166 | my($debugging, %expected, $inner_type, $where_declared, $within); |
167 | my($nc_attempt, $call_outer, $call_inner, $undef_outer); |
168 | my($code, $inner_sub_test, $expected, $line, $errors, $output); |
169 | my(@inners, $sub_test, $pid); |
170 | $debugging = 1 if defined($ARGV[0]) and $ARGV[0] eq '-debug'; |
171 | |
172 | # The expected values for these tests |
173 | %expected = ( |
174 | 'global_scalar' => 1001, |
175 | 'global_array' => 2101, |
176 | 'global_hash' => 3004, |
177 | 'fs_scalar' => 4001, |
178 | 'fs_array' => 5101, |
179 | 'fs_hash' => 6004, |
180 | 'sub_scalar' => 7001, |
181 | 'sub_array' => 8101, |
182 | 'sub_hash' => 9004, |
183 | 'foreach' => 10011, |
184 | ); |
185 | |
186 | # Our innermost sub is either named or anonymous |
187 | for $inner_type (qw!named anon!) { |
188 | # And it may be declared at filescope, within a named |
189 | # sub, or within an anon sub |
190 | for $where_declared (qw!filescope in_named in_anon!) { |
191 | # And that, in turn, may be within a foreach loop, |
192 | # a naked block, or another named sub |
193 | for $within (qw!foreach naked other_sub!) { |
194 | |
195 | # Here are a number of variables which show what's |
196 | # going on, in a way. |
197 | $nc_attempt = 0+ # Named closure attempted |
198 | ( ($inner_type eq 'named') || |
199 | ($within eq 'other_sub') ) ; |
200 | $call_inner = 0+ # Need to call &inner |
201 | ( ($inner_type eq 'anon') && |
202 | ($within eq 'other_sub') ) ; |
203 | $call_outer = 0+ # Need to call &outer or &$outer |
204 | ( ($inner_type eq 'anon') && |
205 | ($within ne 'other_sub') ) ; |
206 | $undef_outer = 0+ # $outer is created but unused |
207 | ( ($where_declared eq 'in_anon') && |
208 | (not $call_outer) ) ; |
209 | |
210 | $code = "# This is a test script built by t/op/closure.t\n\n"; |
211 | |
212 | $code .= <<"DEBUG_INFO" if $debugging; |
213 | # inner_type: $inner_type |
214 | # where_declared: $where_declared |
215 | # within: $within |
216 | # nc_attempt: $nc_attempt |
217 | # call_inner: $call_inner |
218 | # call_outer: $call_outer |
219 | # undef_outer: $undef_outer |
220 | DEBUG_INFO |
221 | |
222 | $code .= <<"END_MARK_ONE"; |
223 | |
224 | BEGIN { \$SIG{__WARN__} = sub { |
225 | my \$msg = \$_[0]; |
226 | END_MARK_ONE |
227 | |
228 | $code .= <<"END_MARK_TWO" if $nc_attempt; |
229 | return if index(\$msg, 'will not stay shared') != -1; |
230 | return if index(\$msg, 'may be unavailable') != -1; |
231 | END_MARK_TWO |
232 | |
233 | $code .= <<"END_MARK_THREE"; # Backwhack a lot! |
234 | print "not ok: got unexpected warning \$msg\\n"; |
235 | } } |
236 | |
237 | { |
238 | my \$test = $test; |
239 | sub test (&) { |
240 | my \$result = &{\$_[0]}; |
241 | print "not " unless \$result; |
242 | print "ok \$test\\n"; |
243 | \$test++; |
244 | } |
245 | } |
246 | |
247 | # some of the variables which the closure will access |
248 | \$global_scalar = 1000; |
249 | \@global_array = (2000, 2100, 2200, 2300); |
250 | %global_hash = 3000..3009; |
251 | |
252 | my \$fs_scalar = 4000; |
253 | my \@fs_array = (5000, 5100, 5200, 5300); |
254 | my %fs_hash = 6000..6009; |
255 | |
256 | END_MARK_THREE |
257 | |
258 | if ($where_declared eq 'filescope') { |
259 | # Nothing here |
260 | } elsif ($where_declared eq 'in_named') { |
261 | $code .= <<'END'; |
262 | sub outer { |
263 | my $sub_scalar = 7000; |
264 | my @sub_array = (8000, 8100, 8200, 8300); |
265 | my %sub_hash = 9000..9009; |
266 | END |
267 | # } |
268 | } elsif ($where_declared eq 'in_anon') { |
269 | $code .= <<'END'; |
270 | $outer = sub { |
271 | my $sub_scalar = 7000; |
272 | my @sub_array = (8000, 8100, 8200, 8300); |
273 | my %sub_hash = 9000..9009; |
274 | END |
275 | # } |
276 | } else { |
277 | die "What was $where_declared?" |
278 | } |
279 | |
280 | if ($within eq 'foreach') { |
281 | $code .= " |
282 | my \$foreach = 12000; |
283 | my \@list = (10000, 10010); |
284 | foreach \$foreach (\@list) { |
285 | " # } |
286 | } elsif ($within eq 'naked') { |
287 | $code .= " { # naked block\n" # } |
288 | } elsif ($within eq 'other_sub') { |
289 | $code .= " sub inner_sub {\n" # } |
290 | } else { |
291 | die "What was $within?" |
292 | } |
293 | |
294 | $sub_test = $test; |
295 | @inners = ( qw!global_scalar global_array global_hash! , |
296 | qw!fs_scalar fs_array fs_hash! ); |
297 | push @inners, 'foreach' if $within eq 'foreach'; |
298 | if ($where_declared ne 'filescope') { |
299 | push @inners, qw!sub_scalar sub_array sub_hash!; |
300 | } |
301 | for $inner_sub_test (@inners) { |
302 | |
303 | if ($inner_type eq 'named') { |
304 | $code .= " sub named_$sub_test " |
305 | } elsif ($inner_type eq 'anon') { |
306 | $code .= " \$anon_$sub_test = sub " |
307 | } else { |
308 | die "What was $inner_type?" |
309 | } |
310 | |
311 | # Now to write the body of the test sub |
312 | if ($inner_sub_test eq 'global_scalar') { |
313 | $code .= '{ ++$global_scalar }' |
314 | } elsif ($inner_sub_test eq 'fs_scalar') { |
315 | $code .= '{ ++$fs_scalar }' |
316 | } elsif ($inner_sub_test eq 'sub_scalar') { |
317 | $code .= '{ ++$sub_scalar }' |
318 | } elsif ($inner_sub_test eq 'global_array') { |
319 | $code .= '{ ++$global_array[1] }' |
320 | } elsif ($inner_sub_test eq 'fs_array') { |
321 | $code .= '{ ++$fs_array[1] }' |
322 | } elsif ($inner_sub_test eq 'sub_array') { |
323 | $code .= '{ ++$sub_array[1] }' |
324 | } elsif ($inner_sub_test eq 'global_hash') { |
325 | $code .= '{ ++$global_hash{3002} }' |
326 | } elsif ($inner_sub_test eq 'fs_hash') { |
327 | $code .= '{ ++$fs_hash{6002} }' |
328 | } elsif ($inner_sub_test eq 'sub_hash') { |
329 | $code .= '{ ++$sub_hash{9002} }' |
330 | } elsif ($inner_sub_test eq 'foreach') { |
331 | $code .= '{ ++$foreach }' |
332 | } else { |
333 | die "What was $inner_sub_test?" |
334 | } |
335 | |
336 | # Close up |
337 | if ($inner_type eq 'anon') { |
338 | $code .= ';' |
339 | } |
340 | $code .= "\n"; |
341 | $sub_test++; # sub name sequence number |
342 | |
343 | } # End of foreach $inner_sub_test |
344 | |
345 | # Close up $within block # { |
346 | $code .= " }\n\n"; |
347 | |
348 | # Close up $where_declared block |
349 | if ($where_declared eq 'in_named') { # { |
350 | $code .= "}\n\n"; |
351 | } elsif ($where_declared eq 'in_anon') { # { |
352 | $code .= "};\n\n"; |
353 | } |
354 | |
355 | # We may need to do something with the sub we just made... |
356 | $code .= "undef \$outer;\n" if $undef_outer; |
357 | $code .= "&inner_sub;\n" if $call_inner; |
358 | if ($call_outer) { |
359 | if ($where_declared eq 'in_named') { |
360 | $code .= "&outer;\n\n"; |
361 | } elsif ($where_declared eq 'in_anon') { |
362 | $code .= "&\$outer;\n\n" |
363 | } |
364 | } |
365 | |
366 | # Now, we can actually prep to run the tests. |
367 | for $inner_sub_test (@inners) { |
368 | $expected = $expected{$inner_sub_test} or |
369 | die "expected $inner_sub_test missing"; |
370 | |
371 | # Named closures won't access the expected vars |
372 | if ( $nc_attempt and |
373 | substr($inner_sub_test, 0, 4) eq "sub_" ) { |
374 | $expected = 1; |
375 | } |
376 | |
377 | # If you make a sub within a foreach loop, |
378 | # what happens if it tries to access the |
379 | # foreach index variable? If it's a named |
380 | # sub, it gets the var from "outside" the loop, |
381 | # but if it's anon, it gets the value to which |
382 | # the index variable is aliased. |
383 | # |
384 | # Of course, if the value was set only |
385 | # within another sub which was never called, |
386 | # the value has not been set yet. |
387 | # |
388 | if ($inner_sub_test eq 'foreach') { |
389 | if ($inner_type eq 'named') { |
390 | if ($call_outer || ($where_declared eq 'filescope')) { |
391 | $expected = 12001 |
392 | } else { |
393 | $expected = 1 |
394 | } |
395 | } |
396 | } |
397 | |
398 | # Here's the test: |
399 | if ($inner_type eq 'anon') { |
400 | $code .= "test { &\$anon_$test == $expected };\n" |
401 | } else { |
402 | $code .= "test { &named_$test == $expected };\n" |
403 | } |
404 | $test++; |
405 | } |
406 | |
68dc0745 |
407 | if ($Config{d_fork} and $^O ne 'VMS' and $^O ne 'MSWin32') { |
f86702cc |
408 | # Fork off a new perl to run the tests. |
409 | # (This is so we can catch spurious warnings.) |
410 | $| = 1; print ""; $| = 0; # flush output before forking |
411 | pipe READ, WRITE or die "Can't make pipe: $!"; |
412 | pipe READ2, WRITE2 or die "Can't make second pipe: $!"; |
413 | die "Can't fork: $!" unless defined($pid = open PERL, "|-"); |
414 | unless ($pid) { |
415 | # Child process here. We're going to send errors back |
416 | # through the extra pipe. |
417 | close READ; |
418 | close READ2; |
419 | open STDOUT, ">&WRITE" or die "Can't redirect STDOUT: $!"; |
420 | open STDERR, ">&WRITE2" or die "Can't redirect STDERR: $!"; |
421 | exec './perl', '-w', '-' |
0a753a76 |
422 | or die "Can't exec ./perl: $!"; |
f86702cc |
423 | } else { |
424 | # Parent process here. |
425 | close WRITE; |
426 | close WRITE2; |
427 | print PERL $code; |
428 | close PERL; |
429 | { local $/; |
430 | $output = join '', <READ>; |
431 | $errors = join '', <READ2>; } |
432 | close READ; |
433 | close READ2; |
434 | } |
435 | } else { |
436 | # No fork(). Do it the hard way. |
437 | my $cmdfile = "tcmd$$"; $cmdfile++ while -e $cmdfile; |
f86702cc |
438 | my $errfile = "terr$$"; $errfile++ while -e $errfile; |
aa689395 |
439 | my @tmpfiles = ($cmdfile, $errfile); |
f86702cc |
440 | open CMD, ">$cmdfile"; print CMD $code; close CMD; |
68dc0745 |
441 | my $cmd = (($^O eq 'VMS') ? "MCR $^X" |
442 | : ($^O eq 'MSWin32') ? '.\perl' |
443 | : './perl'); |
aa689395 |
444 | $cmd .= " -w $cmdfile 2>$errfile"; |
68dc0745 |
445 | if ($^O eq 'VMS' or $^O eq 'MSWin32') { |
aa689395 |
446 | # Use pipe instead of system so we don't inherit STD* from |
447 | # this process, and then foul our pipe back to parent by |
448 | # redirecting output in the child. |
449 | open PERL,"$cmd |" or die "Can't open pipe: $!\n"; |
450 | { local $/; $output = join '', <PERL> } |
451 | close PERL; |
452 | } else { |
453 | my $outfile = "tout$$"; $outfile++ while -e $outfile; |
454 | push @tmpfiles, $outfile; |
455 | system "$cmd >$outfile"; |
456 | { local $/; open IN, $outfile; $output = <IN>; close IN } |
457 | } |
f86702cc |
458 | if ($?) { |
459 | printf "not ok: exited with error code %04X\n", $?; |
aa689395 |
460 | $debugging or do { 1 while unlink @tmpfiles }; |
f86702cc |
461 | exit; |
462 | } |
aa689395 |
463 | { local $/; open IN, $errfile; $errors = <IN>; close IN } |
464 | 1 while unlink @tmpfiles; |
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465 | } |
f86702cc |
466 | print $output; |
467 | print STDERR $errors; |
0a753a76 |
468 | if ($debugging && ($errors || $? || ($output =~ /not ok/))) { |
469 | my $lnum = 0; |
470 | for $line (split '\n', $code) { |
471 | printf "%3d: %s\n", ++$lnum, $line; |
472 | } |
473 | } |
f86702cc |
474 | printf "not ok: exited with error code %04X\n", $? if $?; |
475 | print "-" x 30, "\n" if $debugging; |
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476 | |
477 | } # End of foreach $within |
478 | } # End of foreach $where_declared |
479 | } # End of foreach $inner_type |
480 | |
481 | } |
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482 | |