Commit | Line | Data |
6e90668e |
1 | # B::Deparse.pm |
2 | # Copyright (c) 1998 Stephen McCamant. All rights reserved. |
3 | # This module is free software; you can redistribute and/or modify |
4 | # it under the same terms as Perl itself. |
5 | |
6 | # This is based on the module of the same name by Malcolm Beattie, |
7 | # but essentially none of his code remains. |
8 | |
a798dbf2 |
9 | package B::Deparse; |
6e90668e |
10 | use Carp 'cluck'; |
11 | use B qw(class main_root main_start main_cv svref_2object); |
f5aa8f4e |
12 | $VERSION = 0.56; |
a798dbf2 |
13 | use strict; |
a798dbf2 |
14 | |
6e90668e |
15 | # Changes between 0.50 and 0.51: |
16 | # - fixed nulled leave with live enter in sort { } |
17 | # - fixed reference constants (\"str") |
18 | # - handle empty programs gracefully |
19 | # - handle infinte loops (for (;;) {}, while (1) {}) |
20 | # - differentiate between `for my $x ...' and `my $x; for $x ...' |
21 | # - various minor cleanups |
22 | # - moved globals into an object |
23 | # - added `-u', like B::C |
24 | # - package declarations using cop_stash |
25 | # - subs, formats and code sorted by cop_seq |
f6f9bdb7 |
26 | # Changes between 0.51 and 0.52: |
27 | # - added pp_threadsv (special variables under USE_THREADS) |
28 | # - added documentation |
9d2c6865 |
29 | # Changes between 0.52 and 0.53 |
30 | # - many changes adding precedence contexts and associativity |
31 | # - added `-p' and `-s' output style options |
32 | # - various other minor fixes |
d7f5b6da |
33 | # Changes between 0.53 and 0.54 |
34 | # - added support for new `for (1..100)' optimization, |
35 | # thanks to Gisle Aas |
90be192f |
36 | # Changes between 0.54 and 0.55 |
37 | # - added support for new qr// construct |
38 | # - added support for new pp_regcreset OP |
f5aa8f4e |
39 | # Changes between 0.55 and 0.56 |
40 | # - tested on base/*.t, cmd/*.t, comp/*.t, io/*.t |
41 | # - fixed $# on non-lexicals broken in last big rewrite |
42 | # - added temporary fix for change in opcode of OP_STRINGIFY |
43 | # - fixed problem in 0.54's for() patch in `for (@ary)' |
44 | # - fixed precedence in conditional of ?: |
45 | # - tweaked list paren elimination in `my($x) = @_' |
46 | # - made continue-block detection trickier wrt. null ops |
47 | # - fixed various prototype problems in pp_entersub |
48 | # - added support for sub prototypes that never get GVs |
49 | # - added unquoting for special filehandle first arg in truncate |
50 | # - print doubled rv2gv (a bug) as `*{*GV}' instead of illegal `**GV' |
51 | # - added semicolons at the ends of blocks |
52 | # - added -l `#line' declaration option -- fixes cmd/subval.t 27,28 |
6e90668e |
53 | |
54 | # Todo: |
9d2c6865 |
55 | # - {} around variables in strings ("${var}letters") |
f5aa8f4e |
56 | # base/lex.t 25-27 |
57 | # comp/term.t 11 |
58 | # - generate symbolic constants directly from core source |
90be192f |
59 | # - left/right context |
f5aa8f4e |
60 | # - avoid semis in one-statement blocks |
9d2c6865 |
61 | # - associativity of &&=, ||=, ?: |
6e90668e |
62 | # - ',' => '=>' (auto-unquote?) |
63 | # - break long lines ("\r" as discretionary break?) |
f5aa8f4e |
64 | # - include values of variables (e.g. set in BEGIN) |
65 | # - coordinate with Data::Dumper (both directions? see previous) |
6e90668e |
66 | # - version using op_next instead of op_first/sibling? |
67 | # - avoid string copies (pass arrays, one big join?) |
68 | # - auto-apply `-u'? |
9d2c6865 |
69 | # - while{} with one-statement continue => for(; XXX; XXX) {}? |
70 | # - -uPackage:: descend recursively? |
71 | # - here-docs? |
72 | # - <DATA>? |
6e90668e |
73 | |
f5aa8f4e |
74 | # Tests that will always fail: |
75 | # comp/redef.t -- all (redefinition happens at compile time) |
76 | |
6e90668e |
77 | # Object fields (were globals): |
78 | # |
79 | # avoid_local: |
80 | # (local($a), local($b)) and local($a, $b) have the same internal |
81 | # representation but the short form looks better. We notice we can |
82 | # use a large-scale local when checking the list, but need to prevent |
83 | # individual locals too. This hash holds the addresses of OPs that |
84 | # have already had their local-ness accounted for. The same thing |
85 | # is done with my(). |
86 | # |
87 | # curcv: |
88 | # CV for current sub (or main program) being deparsed |
89 | # |
90 | # curstash: |
91 | # name of the current package for deparsed code |
92 | # |
93 | # subs_todo: |
94 | # array of [cop_seq, GV, is_format?] for subs and formats we still |
95 | # want to deparse |
96 | # |
f5aa8f4e |
97 | # protos_todo: |
98 | # as above, but [name, prototype] for subs that never got a GV |
99 | # |
6e90668e |
100 | # subs_done, forms_done: |
101 | # keys are addresses of GVs for subs and formats we've already |
102 | # deparsed (or at least put into subs_todo) |
9d2c6865 |
103 | # |
104 | # parens: -p |
f5aa8f4e |
105 | # linenums: -l |
9d2c6865 |
106 | # cuddle: ` ' or `\n', depending on -sC |
107 | |
108 | # A little explanation of how precedence contexts and associativity |
109 | # work: |
110 | # |
111 | # deparse() calls each per-op subroutine with an argument $cx (short |
112 | # for context, but not the same as the cx* in the perl core), which is |
113 | # a number describing the op's parents in terms of precedence, whether |
f5aa8f4e |
114 | # they're inside an expression or at statement level, etc. (see |
9d2c6865 |
115 | # chart below). When ops with children call deparse on them, they pass |
116 | # along their precedence. Fractional values are used to implement |
117 | # associativity (`($x + $y) + $z' => `$x + $y + $y') and related |
118 | # parentheses hacks. The major disadvantage of this scheme is that |
119 | # it doesn't know about right sides and left sides, so say if you |
120 | # assign a listop to a variable, it can't tell it's allowed to leave |
121 | # the parens off the listop. |
122 | |
123 | # Precedences: |
124 | # 26 [TODO] inside interpolation context ("") |
125 | # 25 left terms and list operators (leftward) |
126 | # 24 left -> |
127 | # 23 nonassoc ++ -- |
128 | # 22 right ** |
129 | # 21 right ! ~ \ and unary + and - |
130 | # 20 left =~ !~ |
131 | # 19 left * / % x |
132 | # 18 left + - . |
133 | # 17 left << >> |
134 | # 16 nonassoc named unary operators |
135 | # 15 nonassoc < > <= >= lt gt le ge |
136 | # 14 nonassoc == != <=> eq ne cmp |
137 | # 13 left & |
138 | # 12 left | ^ |
139 | # 11 left && |
140 | # 10 left || |
141 | # 9 nonassoc .. ... |
142 | # 8 right ?: |
143 | # 7 right = += -= *= etc. |
144 | # 6 left , => |
145 | # 5 nonassoc list operators (rightward) |
146 | # 4 right not |
147 | # 3 left and |
148 | # 2 left or xor |
149 | # 1 statement modifiers |
150 | # 0 statement level |
151 | |
152 | # Nonprinting characters with special meaning: |
153 | # \cS - steal parens (see maybe_parens_unop) |
154 | # \n - newline and indent |
155 | # \t - increase indent |
156 | # \b - decrease indent (`outdent') |
f5aa8f4e |
157 | # \f - flush left (no indent) |
9d2c6865 |
158 | # \cK - kill following semicolon, if any |
6e90668e |
159 | |
160 | sub null { |
161 | my $op = shift; |
162 | return class($op) eq "NULL"; |
163 | } |
164 | |
165 | sub todo { |
166 | my $self = shift; |
167 | my($gv, $cv, $is_form) = @_; |
168 | my $seq; |
169 | if (!null($cv->START) and is_state($cv->START)) { |
170 | $seq = $cv->START->cop_seq; |
171 | } else { |
172 | $seq = 0; |
173 | } |
174 | push @{$self->{'subs_todo'}}, [$seq, $gv, $is_form]; |
175 | } |
176 | |
177 | sub next_todo { |
178 | my $self = shift; |
179 | my $ent = shift @{$self->{'subs_todo'}}; |
180 | my $name = $self->gv_name($ent->[1]); |
181 | if ($ent->[2]) { |
182 | return "format $name =\n" |
183 | . $self->deparse_format($ent->[1]->FORM). "\n"; |
184 | } else { |
185 | return "sub $name " . |
186 | $self->deparse_sub($ent->[1]->CV); |
187 | } |
188 | } |
189 | |
190 | sub OPf_KIDS () { 4 } |
191 | |
192 | sub walk_tree { |
193 | my($op, $sub) = @_; |
194 | $sub->($op); |
195 | if ($op->flags & OPf_KIDS) { |
196 | my $kid; |
197 | for ($kid = $op->first; not null $kid; $kid = $kid->sibling) { |
198 | walk_tree($kid, $sub); |
199 | } |
200 | } |
201 | } |
202 | |
203 | sub walk_sub { |
204 | my $self = shift; |
205 | my $cv = shift; |
206 | my $op = $cv->ROOT; |
207 | $op = shift if null $op; |
208 | return if !$op or null $op; |
209 | walk_tree($op, sub { |
210 | my $op = shift; |
211 | if ($op->ppaddr eq "pp_gv") { |
212 | if ($op->next->ppaddr eq "pp_entersub") { |
213 | next if $self->{'subs_done'}{$ {$op->gv}}++; |
214 | next if class($op->gv->CV) eq "SPECIAL"; |
215 | $self->todo($op->gv, $op->gv->CV, 0); |
216 | $self->walk_sub($op->gv->CV); |
217 | } elsif ($op->next->ppaddr eq "pp_enterwrite" |
218 | or ($op->next->ppaddr eq "pp_rv2gv" |
219 | and $op->next->next->ppaddr eq "pp_enterwrite")) { |
220 | next if $self->{'forms_done'}{$ {$op->gv}}++; |
221 | next if class($op->gv->FORM) eq "SPECIAL"; |
222 | $self->todo($op->gv, $op->gv->FORM, 1); |
223 | $self->walk_sub($op->gv->FORM); |
224 | } |
225 | } |
226 | }); |
227 | } |
228 | |
229 | sub stash_subs { |
230 | my $self = shift; |
231 | my $pack = shift; |
232 | my(%stash, @ret); |
233 | { no strict 'refs'; %stash = svref_2object(\%{$pack . "::"})->ARRAY } |
f5aa8f4e |
234 | if ($pack eq "main") { |
235 | $pack = ""; |
236 | } else { |
237 | $pack = $pack . "::"; |
238 | } |
6e90668e |
239 | my($key, $val); |
240 | while (($key, $val) = each %stash) { |
f5aa8f4e |
241 | my $class = class($val); |
242 | if ($class eq "PV") { |
243 | # Just a prototype |
244 | push @{$self->{'protos_todo'}}, [$pack . $key, $val->PV]; |
245 | } elsif ($class eq "IV") { |
246 | # Just a name |
247 | push @{$self->{'protos_todo'}}, [$pack . $key, undef]; |
248 | } elsif ($class eq "GV") { |
249 | if (class($val->CV) ne "SPECIAL") { |
250 | next if $self->{'subs_done'}{$$val}++; |
251 | $self->todo($val, $val->CV, 0); |
252 | $self->walk_sub($val->CV); |
253 | } |
254 | if (class($val->FORM) ne "SPECIAL") { |
255 | next if $self->{'forms_done'}{$$val}++; |
256 | $self->todo($val, $val->FORM, 1); |
257 | $self->walk_sub($val->FORM); |
258 | } |
6e90668e |
259 | } |
260 | } |
261 | } |
a798dbf2 |
262 | |
f5aa8f4e |
263 | sub print_protos { |
264 | my $self = shift; |
265 | my $ar; |
266 | my @ret; |
267 | foreach $ar (@{$self->{'protos_todo'}}) { |
268 | my $proto = (defined $ar->[1] ? " (". $ar->[1] . ")" : ""); |
269 | push @ret, "sub " . $ar->[0] . "$proto;\n"; |
270 | } |
271 | delete $self->{'protos_todo'}; |
272 | return @ret; |
273 | } |
274 | |
9d2c6865 |
275 | sub style_opts { |
276 | my $self = shift; |
277 | my $opts = shift; |
278 | my $opt; |
279 | while (length($opt = substr($opts, 0, 1))) { |
280 | if ($opt eq "C") { |
281 | $self->{'cuddle'} = " "; |
282 | } |
283 | $opts = substr($opts, 1); |
284 | } |
285 | } |
286 | |
a798dbf2 |
287 | sub compile { |
6e90668e |
288 | my(@args) = @_; |
289 | return sub { |
290 | my $self = bless {}; |
291 | my $arg; |
292 | $self->{'subs_todo'} = []; |
293 | $self->stash_subs("main"); |
294 | $self->{'curcv'} = main_cv; |
295 | $self->{'curstash'} = "main"; |
9d2c6865 |
296 | $self->{'cuddle'} = "\n"; |
6e90668e |
297 | while ($arg = shift @args) { |
298 | if (substr($arg, 0, 2) eq "-u") { |
299 | $self->stash_subs(substr($arg, 2)); |
9d2c6865 |
300 | } elsif ($arg eq "-p") { |
301 | $self->{'parens'} = 1; |
f5aa8f4e |
302 | } elsif ($arg eq "-l") { |
303 | $self->{'linenums'} = 1; |
9d2c6865 |
304 | } elsif (substr($arg, 0, 2) eq "-s") { |
305 | $self->style_opts(substr $arg, 2); |
6e90668e |
306 | } |
307 | } |
308 | $self->walk_sub(main_cv, main_start); |
f5aa8f4e |
309 | print $self->print_protos; |
6e90668e |
310 | @{$self->{'subs_todo'}} = |
311 | sort {$a->[0] <=> $b->[0]} @{$self->{'subs_todo'}}; |
9d2c6865 |
312 | print indent($self->deparse(main_root, 0)), "\n" unless null main_root; |
6e90668e |
313 | my @text; |
314 | while (scalar(@{$self->{'subs_todo'}})) { |
315 | push @text, $self->next_todo; |
316 | } |
317 | print indent(join("", @text)), "\n" if @text; |
a798dbf2 |
318 | } |
a798dbf2 |
319 | } |
320 | |
6e90668e |
321 | sub deparse { |
322 | my $self = shift; |
9d2c6865 |
323 | my($op, $cx) = @_; |
324 | # cluck if class($op) eq "NULL"; |
6e90668e |
325 | my $meth = $op->ppaddr; |
9d2c6865 |
326 | return $self->$meth($op, $cx); |
a798dbf2 |
327 | } |
328 | |
6e90668e |
329 | sub indent { |
330 | my $txt = shift; |
331 | my @lines = split(/\n/, $txt); |
332 | my $leader = ""; |
333 | my $line; |
334 | for $line (@lines) { |
335 | if (substr($line, 0, 1) eq "\t") { |
336 | $leader = $leader . " "; |
337 | $line = substr($line, 1); |
338 | } elsif (substr($line, 0, 1) eq "\b") { |
339 | $leader = substr($leader, 0, length($leader) - 4); |
340 | $line = substr($line, 1); |
341 | } |
f5aa8f4e |
342 | if (substr($line, 0, 1) eq "\f") { |
343 | $line = substr($line, 1); # no indent |
344 | } else { |
345 | $line = $leader . $line; |
346 | } |
9d2c6865 |
347 | $line =~ s/\cK;?//g; |
6e90668e |
348 | } |
349 | return join("\n", @lines); |
350 | } |
351 | |
352 | sub SVf_POK () {0x40000} |
353 | |
354 | sub deparse_sub { |
355 | my $self = shift; |
356 | my $cv = shift; |
357 | my $proto = ""; |
358 | if ($cv->FLAGS & SVf_POK) { |
359 | $proto = "(". $cv->PV . ") "; |
360 | } |
361 | local($self->{'curcv'}) = $cv; |
362 | local($self->{'curstash'}) = $self->{'curstash'}; |
363 | if (not null $cv->ROOT) { |
364 | # skip leavesub |
365 | return $proto . "{\n\t" . |
9d2c6865 |
366 | $self->deparse($cv->ROOT->first, 0) . "\n\b}\n"; |
6e90668e |
367 | } else { # XSUB? |
368 | return $proto . "{}\n"; |
369 | } |
370 | } |
371 | |
372 | sub deparse_format { |
373 | my $self = shift; |
374 | my $form = shift; |
375 | my @text; |
376 | local($self->{'curcv'}) = $form; |
377 | local($self->{'curstash'}) = $self->{'curstash'}; |
378 | my $op = $form->ROOT; |
379 | my $kid; |
380 | $op = $op->first->first; # skip leavewrite, lineseq |
381 | while (not null $op) { |
382 | $op = $op->sibling; # skip nextstate |
383 | my @exprs; |
384 | $kid = $op->first->sibling; # skip pushmark |
385 | push @text, $kid->sv->PV; |
386 | $kid = $kid->sibling; |
387 | for (; not null $kid; $kid = $kid->sibling) { |
9d2c6865 |
388 | push @exprs, $self->deparse($kid, 0); |
6e90668e |
389 | } |
390 | push @text, join(", ", @exprs)."\n" if @exprs; |
391 | $op = $op->sibling; |
392 | } |
393 | return join("", @text) . "."; |
394 | } |
395 | |
396 | # the aassign in-common check messes up SvCUR (always setting it |
397 | # to a value >= 100), but it's probably safe to assume there |
398 | # won't be any NULs in the names of my() variables. (with |
399 | # stash variables, I wouldn't be so sure) |
400 | sub padname_fix { |
401 | my $str = shift; |
402 | $str = substr($str, 0, index($str, "\0")) if index($str, "\0") != -1; |
403 | return $str; |
404 | } |
405 | |
406 | sub is_scope { |
a798dbf2 |
407 | my $op = shift; |
6e90668e |
408 | return $op->ppaddr eq "pp_leave" || $op->ppaddr eq "pp_scope" |
9d2c6865 |
409 | || $op->ppaddr eq "pp_lineseq" |
6e90668e |
410 | || ($op->ppaddr eq "pp_null" && class($op) eq "UNOP" |
411 | && (is_scope($op->first) || $op->first->ppaddr eq "pp_enter")); |
412 | } |
413 | |
414 | sub is_state { |
415 | my $name = $_[0]->ppaddr; |
416 | return $name eq "pp_nextstate" || $name eq "pp_dbstate"; |
417 | } |
418 | |
419 | sub is_miniwhile { # check for one-line loop (`foo() while $y--') |
420 | my $op = shift; |
421 | return (!null($op) and null($op->sibling) |
422 | and $op->ppaddr eq "pp_null" and class($op) eq "UNOP" |
423 | and (($op->first->ppaddr =~ /^pp_(and|or)$/ |
424 | and $op->first->first->sibling->ppaddr eq "pp_lineseq") |
425 | or ($op->first->ppaddr eq "pp_lineseq" |
426 | and not null $op->first->first->sibling |
427 | and $op->first->first->sibling->ppaddr eq "pp_unstack") |
428 | )); |
429 | } |
430 | |
431 | sub is_scalar { |
432 | my $op = shift; |
433 | return ($op->ppaddr eq "pp_rv2sv" or |
434 | $op->ppaddr eq "pp_padsv" or |
435 | $op->ppaddr eq "pp_gv" or # only in array/hash constructs |
436 | !null($op->first) && $op->first->ppaddr eq "pp_gvsv"); |
437 | } |
438 | |
9d2c6865 |
439 | sub maybe_parens { |
440 | my $self = shift; |
441 | my($text, $cx, $prec) = @_; |
442 | if ($prec < $cx # unary ops nest just fine |
443 | or $prec == $cx and $cx != 4 and $cx != 16 and $cx != 21 |
444 | or $self->{'parens'}) |
445 | { |
446 | $text = "($text)"; |
447 | # In a unop, let parent reuse our parens; see maybe_parens_unop |
448 | $text = "\cS" . $text if $cx == 16; |
449 | return $text; |
450 | } else { |
451 | return $text; |
452 | } |
453 | } |
454 | |
455 | # same as above, but get around the `if it looks like a function' rule |
456 | sub maybe_parens_unop { |
457 | my $self = shift; |
458 | my($name, $kid, $cx) = @_; |
459 | if ($cx > 16 or $self->{'parens'}) { |
460 | return "$name(" . $self->deparse($kid, 1) . ")"; |
461 | } else { |
462 | $kid = $self->deparse($kid, 16); |
463 | if (substr($kid, 0, 1) eq "\cS") { |
464 | # use kid's parens |
465 | return $name . substr($kid, 1); |
466 | } elsif (substr($kid, 0, 1) eq "(") { |
467 | # avoid looks-like-a-function trap with extra parens |
468 | # (`+' can lead to ambiguities) |
469 | return "$name(" . $kid . ")"; |
470 | } else { |
471 | return "$name $kid"; |
472 | } |
473 | } |
474 | } |
475 | |
476 | sub maybe_parens_func { |
477 | my $self = shift; |
478 | my($func, $text, $cx, $prec) = @_; |
479 | if ($prec <= $cx or substr($text, 0, 1) eq "(" or $self->{'parens'}) { |
480 | return "$func($text)"; |
481 | } else { |
482 | return "$func $text"; |
483 | } |
484 | } |
485 | |
6e90668e |
486 | sub OPp_LVAL_INTRO () { 128 } |
487 | |
488 | sub maybe_local { |
489 | my $self = shift; |
9d2c6865 |
490 | my($op, $cx, $text) = @_; |
6e90668e |
491 | if ($op->private & OPp_LVAL_INTRO and not $self->{'avoid_local'}{$$op}) { |
9d2c6865 |
492 | return $self->maybe_parens_func("local", $text, $cx, 16); |
6e90668e |
493 | } else { |
494 | return $text; |
a798dbf2 |
495 | } |
a798dbf2 |
496 | } |
497 | |
6e90668e |
498 | sub padname_sv { |
499 | my $self = shift; |
500 | my $targ = shift; |
501 | return (($self->{'curcv'}->PADLIST->ARRAY)[0]->ARRAY)[$targ]; |
502 | } |
503 | |
504 | sub maybe_my { |
505 | my $self = shift; |
9d2c6865 |
506 | my($op, $cx, $text) = @_; |
6e90668e |
507 | if ($op->private & OPp_LVAL_INTRO and not $self->{'avoid_local'}{$$op}) { |
9d2c6865 |
508 | return $self->maybe_parens_func("my", $text, $cx, 16); |
6e90668e |
509 | } else { |
510 | return $text; |
511 | } |
512 | } |
513 | |
9d2c6865 |
514 | # The following OPs don't have functions: |
515 | |
516 | # pp_padany -- does not exist after parsing |
517 | # pp_rcatline -- does not exist |
518 | |
519 | sub pp_enter { # see also leave |
520 | cluck "unexpected OP_ENTER"; |
521 | return "XXX"; |
522 | } |
523 | |
524 | sub pp_pushmark { # see also list |
525 | cluck "unexpected OP_PUSHMARK"; |
526 | return "XXX"; |
527 | } |
528 | |
529 | sub pp_leavesub { # see also deparse_sub |
530 | cluck "unexpected OP_LEAVESUB"; |
531 | return "XXX"; |
532 | } |
533 | |
534 | sub pp_leavewrite { # see also deparse_format |
535 | cluck "unexpected OP_LEAVEWRITE"; |
536 | return "XXX"; |
537 | } |
538 | |
539 | sub pp_method { # see also entersub |
540 | cluck "unexpected OP_METHOD"; |
541 | return "XXX"; |
542 | } |
543 | |
544 | sub pp_regcmaybe { # see also regcomp |
545 | cluck "unexpected OP_REGCMAYBE"; |
546 | return "XXX"; |
547 | } |
548 | |
90be192f |
549 | sub pp_regcreset { # see also regcomp |
550 | cluck "unexpected OP_REGCRESET"; |
551 | return "XXX"; |
552 | } |
553 | |
9d2c6865 |
554 | sub pp_substcont { # see also subst |
555 | cluck "unexpected OP_SUBSTCONT"; |
556 | return "XXX"; |
557 | } |
558 | |
559 | sub pp_grepstart { # see also grepwhile |
560 | cluck "unexpected OP_GREPSTART"; |
561 | return "XXX"; |
562 | } |
563 | |
564 | sub pp_mapstart { # see also mapwhile |
565 | cluck "unexpected OP_MAPSTART"; |
566 | return "XXX"; |
567 | } |
568 | |
569 | sub pp_flip { # see also flop |
570 | cluck "unexpected OP_FLIP"; |
571 | return "XXX"; |
572 | } |
573 | |
574 | sub pp_iter { # see also leaveloop |
575 | cluck "unexpected OP_ITER"; |
576 | return "XXX"; |
577 | } |
578 | |
579 | sub pp_enteriter { # see also leaveloop |
580 | cluck "unexpected OP_ENTERITER"; |
581 | return "XXX"; |
582 | } |
583 | |
584 | sub pp_enterloop { # see also leaveloop |
585 | cluck "unexpected OP_ENTERLOOP"; |
586 | return "XXX"; |
587 | } |
588 | |
589 | sub pp_leaveeval { # see also entereval |
590 | cluck "unexpected OP_LEAVEEVAL"; |
591 | return "XXX"; |
592 | } |
593 | |
594 | sub pp_entertry { # see also leavetry |
595 | cluck "unexpected OP_ENTERTRY"; |
596 | return "XXX"; |
597 | } |
6e90668e |
598 | |
9d2c6865 |
599 | # leave and scope/lineseq should probably share code |
a798dbf2 |
600 | sub pp_leave { |
6e90668e |
601 | my $self = shift; |
9d2c6865 |
602 | my($op, $cx) = @_; |
6e90668e |
603 | my ($kid, $expr); |
604 | my @exprs; |
605 | local($self->{'curstash'}) = $self->{'curstash'}; |
606 | $kid = $op->first->sibling; # skip enter |
607 | if (is_miniwhile($kid)) { |
608 | my $top = $kid->first; |
609 | my $name = $top->ppaddr; |
610 | if ($name eq "pp_and") { |
611 | $name = "while"; |
612 | } elsif ($name eq "pp_or") { |
613 | $name = "until"; |
614 | } else { # no conditional -> while 1 or until 0 |
9d2c6865 |
615 | return $self->deparse($top->first, 1) . " while 1"; |
6e90668e |
616 | } |
617 | my $cond = $top->first; |
9d2c6865 |
618 | my $body = $cond->sibling->first; # skip lineseq |
619 | $cond = $self->deparse($cond, 1); |
620 | $body = $self->deparse($body, 1); |
6e90668e |
621 | return "$body $name $cond"; |
622 | } |
623 | for (; !null($kid); $kid = $kid->sibling) { |
624 | $expr = ""; |
625 | if (is_state $kid) { |
9d2c6865 |
626 | $expr = $self->deparse($kid, 0); |
6e90668e |
627 | $kid = $kid->sibling; |
628 | last if null $kid; |
629 | } |
9d2c6865 |
630 | $expr .= $self->deparse($kid, 0); |
6e90668e |
631 | push @exprs, $expr if $expr; |
632 | } |
9d2c6865 |
633 | if ($cx > 0) { # inside an expression |
634 | return "do { " . join(";\n", @exprs) . " }"; |
635 | } else { |
f5aa8f4e |
636 | return join(";\n", @exprs) . ";"; |
9d2c6865 |
637 | } |
6e90668e |
638 | } |
639 | |
640 | sub pp_scope { |
641 | my $self = shift; |
9d2c6865 |
642 | my($op, $cx) = @_; |
6e90668e |
643 | my ($kid, $expr); |
644 | my @exprs; |
645 | for ($kid = $op->first; !null($kid); $kid = $kid->sibling) { |
646 | $expr = ""; |
647 | if (is_state $kid) { |
9d2c6865 |
648 | $expr = $self->deparse($kid, 0); |
6e90668e |
649 | $kid = $kid->sibling; |
650 | last if null $kid; |
651 | } |
9d2c6865 |
652 | $expr .= $self->deparse($kid, 0); |
6e90668e |
653 | push @exprs, $expr if $expr; |
654 | } |
9d2c6865 |
655 | if ($cx > 0) { # inside an expression, (a do {} while for lineseq) |
656 | return "do { " . join(";\n", @exprs) . " }"; |
657 | } else { |
f5aa8f4e |
658 | return join(";\n", @exprs) . ";"; |
6e90668e |
659 | } |
6e90668e |
660 | } |
661 | |
9d2c6865 |
662 | sub pp_lineseq { pp_scope(@_) } |
663 | |
6e90668e |
664 | # The BEGIN {} is used here because otherwise this code isn't executed |
665 | # when you run B::Deparse on itself. |
666 | my %globalnames; |
667 | BEGIN { map($globalnames{$_}++, "SIG", "STDIN", "STDOUT", "STDERR", "INC", |
668 | "ENV", "ARGV", "ARGVOUT", "_"); } |
669 | |
670 | sub gv_name { |
671 | my $self = shift; |
672 | my $gv = shift; |
673 | my $stash = $gv->STASH->NAME; |
674 | my $name = $gv->NAME; |
9d2c6865 |
675 | if ($stash eq $self->{'curstash'} or $globalnames{$name} |
676 | or $name =~ /^[^A-Za-z_]/) |
677 | { |
6e90668e |
678 | $stash = ""; |
679 | } else { |
680 | $stash = $stash . "::"; |
a798dbf2 |
681 | } |
6e90668e |
682 | if ($name =~ /^([\cA-\cZ])$/) { |
683 | $name = "^" . chr(64 + ord($1)); |
684 | } |
685 | return $stash . $name; |
a798dbf2 |
686 | } |
687 | |
6e90668e |
688 | # Notice how subs and formats are inserted between statements here |
689 | sub pp_nextstate { |
690 | my $self = shift; |
9d2c6865 |
691 | my($op, $cx) = @_; |
6e90668e |
692 | my @text; |
693 | @text = $op->label . ": " if $op->label; |
694 | my $seq = $op->cop_seq; |
695 | while (scalar(@{$self->{'subs_todo'}}) |
696 | and $seq > $self->{'subs_todo'}[0][0]) { |
697 | push @text, $self->next_todo; |
698 | } |
699 | my $stash = $op->stash->NAME; |
700 | if ($stash ne $self->{'curstash'}) { |
701 | push @text, "package $stash;\n"; |
702 | $self->{'curstash'} = $stash; |
703 | } |
f5aa8f4e |
704 | if ($self->{'linenums'}) { |
705 | push @text, "\f#line " . $op->line . |
706 | ' "' . substr($op->filegv->NAME, 2), qq'"\n'; |
707 | } |
6e90668e |
708 | return join("", @text); |
709 | } |
710 | |
711 | sub pp_dbstate { pp_nextstate(@_) } |
712 | |
713 | sub pp_unstack { return "" } # see also leaveloop |
714 | |
715 | sub baseop { |
716 | my $self = shift; |
9d2c6865 |
717 | my($op, $cx, $name) = @_; |
6e90668e |
718 | return $name; |
719 | } |
720 | |
721 | sub pp_stub { baseop(@_, "()") } |
722 | sub pp_wantarray { baseop(@_, "wantarray") } |
723 | sub pp_fork { baseop(@_, "fork") } |
724 | sub pp_wait { baseop(@_, "wait") } |
725 | sub pp_getppid { baseop(@_, "getppid") } |
726 | sub pp_time { baseop(@_, "time") } |
727 | sub pp_tms { baseop(@_, "times") } |
728 | sub pp_ghostent { baseop(@_, "gethostent") } |
729 | sub pp_gnetent { baseop(@_, "getnetent") } |
730 | sub pp_gprotoent { baseop(@_, "getprotoent") } |
731 | sub pp_gservent { baseop(@_, "getservent") } |
732 | sub pp_ehostent { baseop(@_, "endhostent") } |
733 | sub pp_enetent { baseop(@_, "endnetent") } |
734 | sub pp_eprotoent { baseop(@_, "endprotoent") } |
735 | sub pp_eservent { baseop(@_, "endservent") } |
736 | sub pp_gpwent { baseop(@_, "getpwent") } |
737 | sub pp_spwent { baseop(@_, "setpwent") } |
738 | sub pp_epwent { baseop(@_, "endpwent") } |
739 | sub pp_ggrent { baseop(@_, "getgrent") } |
740 | sub pp_sgrent { baseop(@_, "setgrent") } |
741 | sub pp_egrent { baseop(@_, "endgrent") } |
742 | sub pp_getlogin { baseop(@_, "getlogin") } |
743 | |
744 | sub POSTFIX () { 1 } |
745 | |
9d2c6865 |
746 | # I couldn't think of a good short name, but this is the category of |
747 | # symbolic unary operators with interesting precedence |
748 | |
749 | sub pfixop { |
750 | my $self = shift; |
751 | my($op, $cx, $name, $prec, $flags) = (@_, 0); |
752 | my $kid = $op->first; |
753 | $kid = $self->deparse($kid, $prec); |
754 | return $self->maybe_parens(($flags & POSTFIX) ? "$kid$name" : "$name$kid", |
755 | $cx, $prec); |
756 | } |
757 | |
758 | sub pp_preinc { pfixop(@_, "++", 23) } |
759 | sub pp_predec { pfixop(@_, "--", 23) } |
760 | sub pp_postinc { pfixop(@_, "++", 23, POSTFIX) } |
761 | sub pp_postdec { pfixop(@_, "--", 23, POSTFIX) } |
762 | sub pp_i_preinc { pfixop(@_, "++", 23) } |
763 | sub pp_i_predec { pfixop(@_, "--", 23) } |
764 | sub pp_i_postinc { pfixop(@_, "++", 23, POSTFIX) } |
765 | sub pp_i_postdec { pfixop(@_, "--", 23, POSTFIX) } |
766 | sub pp_complement { pfixop(@_, "~", 21) } |
767 | |
768 | sub pp_negate { |
769 | my $self = shift; |
770 | my($op, $cx) = @_; |
771 | if ($op->first->ppaddr =~ /^pp_(i_)?negate$/) { |
772 | # avoid --$x |
773 | $self->pfixop($op, $cx, "-", 21.5); |
774 | } else { |
775 | $self->pfixop($op, $cx, "-", 21); |
776 | } |
777 | } |
778 | sub pp_i_negate { pp_negate(@_) } |
779 | |
780 | sub pp_not { |
781 | my $self = shift; |
782 | my($op, $cx) = @_; |
783 | if ($cx <= 4) { |
784 | $self->pfixop($op, $cx, "not ", 4); |
785 | } else { |
786 | $self->pfixop($op, $cx, "!", 21); |
787 | } |
788 | } |
789 | |
6e90668e |
790 | sub OPf_SPECIAL () { 128 } |
791 | |
792 | sub unop { |
793 | my $self = shift; |
9d2c6865 |
794 | my($op, $cx, $name, $prec, $flags) = (@_, 0, 0); |
6e90668e |
795 | my $kid; |
9d2c6865 |
796 | if ($op->flags & OPf_KIDS) { |
6e90668e |
797 | $kid = $op->first; |
9d2c6865 |
798 | return $self->maybe_parens_unop($name, $kid, $cx); |
6e90668e |
799 | } else { |
9d2c6865 |
800 | return $name . ($op->flags & OPf_SPECIAL ? "()" : ""); |
6e90668e |
801 | } |
6e90668e |
802 | } |
803 | |
6e90668e |
804 | sub pp_chop { unop(@_, "chop") } |
805 | sub pp_chomp { unop(@_, "chomp") } |
806 | sub pp_schop { unop(@_, "chop") } |
807 | sub pp_schomp { unop(@_, "chomp") } |
808 | sub pp_defined { unop(@_, "defined") } |
809 | sub pp_undef { unop(@_, "undef") } |
810 | sub pp_study { unop(@_, "study") } |
6e90668e |
811 | sub pp_ref { unop(@_, "ref") } |
812 | sub pp_pos { maybe_local(@_, unop(@_, "pos")) } |
813 | |
814 | sub pp_sin { unop(@_, "sin") } |
815 | sub pp_cos { unop(@_, "cos") } |
816 | sub pp_rand { unop(@_, "rand") } |
817 | sub pp_srand { unop(@_, "srand") } |
818 | sub pp_exp { unop(@_, "exp") } |
819 | sub pp_log { unop(@_, "log") } |
820 | sub pp_sqrt { unop(@_, "sqrt") } |
821 | sub pp_int { unop(@_, "int") } |
822 | sub pp_hex { unop(@_, "hex") } |
823 | sub pp_oct { unop(@_, "oct") } |
824 | sub pp_abs { unop(@_, "abs") } |
825 | |
826 | sub pp_length { unop(@_, "length") } |
827 | sub pp_ord { unop(@_, "ord") } |
828 | sub pp_chr { unop(@_, "chr") } |
829 | sub pp_ucfirst { unop(@_, "ucfirst") } |
830 | sub pp_lcfirst { unop(@_, "lcfirst") } |
831 | sub pp_uc { unop(@_, "uc") } |
832 | sub pp_lc { unop(@_, "lc") } |
833 | sub pp_quotemeta { unop(@_, "quotemeta") } |
834 | |
835 | sub pp_each { unop(@_, "each") } |
836 | sub pp_values { unop(@_, "values") } |
837 | sub pp_keys { unop(@_, "keys") } |
838 | sub pp_pop { unop(@_, "pop") } |
839 | sub pp_shift { unop(@_, "shift") } |
840 | |
841 | sub pp_caller { unop(@_, "caller") } |
842 | sub pp_reset { unop(@_, "reset") } |
843 | sub pp_exit { unop(@_, "exit") } |
844 | sub pp_prototype { unop(@_, "prototype") } |
845 | |
846 | sub pp_close { unop(@_, "close") } |
847 | sub pp_fileno { unop(@_, "fileno") } |
848 | sub pp_umask { unop(@_, "umask") } |
849 | sub pp_binmode { unop(@_, "binmode") } |
850 | sub pp_untie { unop(@_, "untie") } |
851 | sub pp_tied { unop(@_, "tied") } |
852 | sub pp_dbmclose { unop(@_, "dbmclose") } |
853 | sub pp_getc { unop(@_, "getc") } |
854 | sub pp_eof { unop(@_, "eof") } |
855 | sub pp_tell { unop(@_, "tell") } |
856 | sub pp_getsockname { unop(@_, "getsockname") } |
857 | sub pp_getpeername { unop(@_, "getpeername") } |
858 | |
859 | sub pp_chdir { unop(@_, "chdir") } |
860 | sub pp_chroot { unop(@_, "chroot") } |
861 | sub pp_readlink { unop(@_, "readlink") } |
862 | sub pp_rmdir { unop(@_, "rmdir") } |
863 | sub pp_readdir { unop(@_, "readdir") } |
864 | sub pp_telldir { unop(@_, "telldir") } |
865 | sub pp_rewinddir { unop(@_, "rewinddir") } |
866 | sub pp_closedir { unop(@_, "closedir") } |
867 | sub pp_getpgrp { unop(@_, "getpgrp") } |
868 | sub pp_localtime { unop(@_, "localtime") } |
869 | sub pp_gmtime { unop(@_, "gmtime") } |
870 | sub pp_alarm { unop(@_, "alarm") } |
871 | sub pp_sleep { unop(@_, "sleep") } |
872 | |
873 | sub pp_dofile { unop(@_, "do") } |
874 | sub pp_entereval { unop(@_, "eval") } |
875 | |
876 | sub pp_ghbyname { unop(@_, "gethostbyname") } |
877 | sub pp_gnbyname { unop(@_, "getnetbyname") } |
878 | sub pp_gpbyname { unop(@_, "getprotobyname") } |
879 | sub pp_shostent { unop(@_, "sethostent") } |
880 | sub pp_snetent { unop(@_, "setnetent") } |
881 | sub pp_sprotoent { unop(@_, "setprotoent") } |
882 | sub pp_sservent { unop(@_, "setservent") } |
883 | sub pp_gpwnam { unop(@_, "getpwnam") } |
884 | sub pp_gpwuid { unop(@_, "getpwuid") } |
885 | sub pp_ggrnam { unop(@_, "getgrnam") } |
886 | sub pp_ggrgid { unop(@_, "getgrgid") } |
887 | |
888 | sub pp_lock { unop(@_, "lock") } |
889 | |
890 | sub pp_exists { |
891 | my $self = shift; |
9d2c6865 |
892 | my($op, $cx) = @_; |
893 | return $self->maybe_parens_func("exists", $self->pp_helem($op->first, 16), |
894 | $cx, 16); |
6e90668e |
895 | } |
896 | |
897 | sub OPpSLICE () { 64 } |
898 | |
899 | sub pp_delete { |
900 | my $self = shift; |
9d2c6865 |
901 | my($op, $cx) = @_; |
6e90668e |
902 | my $arg; |
903 | if ($op->private & OPpSLICE) { |
9d2c6865 |
904 | return $self->maybe_parens_func("delete", |
905 | $self->pp_hslice($op->first, 16), |
906 | $cx, 16); |
6e90668e |
907 | } else { |
9d2c6865 |
908 | return $self->maybe_parens_func("delete", |
909 | $self->pp_helem($op->first, 16), |
910 | $cx, 16); |
6e90668e |
911 | } |
6e90668e |
912 | } |
913 | |
914 | sub OPp_CONST_BARE () { 64 } |
915 | |
916 | sub pp_require { |
917 | my $self = shift; |
9d2c6865 |
918 | my($op, $cx) = @_; |
6e90668e |
919 | if (class($op) eq "UNOP" and $op->first->ppaddr eq "pp_const" |
920 | and $op->first->private & OPp_CONST_BARE) |
921 | { |
922 | my $name = $op->first->sv->PV; |
923 | $name =~ s[/][::]g; |
924 | $name =~ s/\.pm//g; |
925 | return "require($name)"; |
926 | } else { |
9d2c6865 |
927 | $self->unop($op, $cx, "require"); |
6e90668e |
928 | } |
929 | } |
930 | |
9d2c6865 |
931 | sub pp_scalar { |
932 | my $self = shift; |
933 | my($op, $cv) = @_; |
934 | my $kid = $op->first; |
935 | if (not null $kid->sibling) { |
936 | # XXX Was a here-doc |
937 | return $self->dquote($op); |
938 | } |
939 | $self->unop(@_, "scalar"); |
940 | } |
941 | |
942 | |
6e90668e |
943 | sub padval { |
944 | my $self = shift; |
945 | my $targ = shift; |
946 | return (($self->{'curcv'}->PADLIST->ARRAY)[1]->ARRAY)[$targ]; |
947 | } |
948 | |
9d2c6865 |
949 | sub OPf_REF () { 16 } |
950 | |
6e90668e |
951 | sub pp_refgen { |
952 | my $self = shift; |
9d2c6865 |
953 | my($op, $cx) = @_; |
6e90668e |
954 | my $kid = $op->first; |
955 | if ($kid->ppaddr eq "pp_null") { |
956 | $kid = $kid->first; |
957 | if ($kid->ppaddr eq "pp_anonlist" || $kid->ppaddr eq "pp_anonhash") { |
958 | my($pre, $post) = @{{"pp_anonlist" => ["[","]"], |
959 | "pp_anonhash" => ["{","}"]}->{$kid->ppaddr}}; |
960 | my($expr, @exprs); |
961 | $kid = $kid->first->sibling; # skip pushmark |
962 | for (; !null($kid); $kid = $kid->sibling) { |
9d2c6865 |
963 | $expr = $self->deparse($kid, 6); |
6e90668e |
964 | push @exprs, $expr; |
965 | } |
966 | return $pre . join(", ", @exprs) . $post; |
967 | } elsif (!null($kid->sibling) and |
968 | $kid->sibling->ppaddr eq "pp_anoncode") { |
969 | return "sub " . |
970 | $self->deparse_sub($self->padval($kid->sibling->targ)); |
9d2c6865 |
971 | } elsif ($kid->ppaddr eq "pp_pushmark" |
972 | and $kid->sibling->ppaddr =~ /^pp_(pad|rv2)[ah]v$/ |
973 | and not $kid->sibling->flags & OPf_REF) { |
974 | # The @a in \(@a) isn't in ref context, but only when the |
975 | # parens are there. |
976 | return "\\(" . $self->deparse($kid->sibling, 1) . ")"; |
6e90668e |
977 | } |
978 | } |
9d2c6865 |
979 | $self->pfixop($op, $cx, "\\", 20); |
6e90668e |
980 | } |
981 | |
982 | sub pp_srefgen { pp_refgen(@_) } |
983 | |
984 | sub pp_readline { |
985 | my $self = shift; |
9d2c6865 |
986 | my($op, $cx) = @_; |
6e90668e |
987 | my $kid = $op->first; |
988 | $kid = $kid->first if $kid->ppaddr eq "pp_rv2gv"; # <$fh> |
989 | if ($kid->ppaddr eq "pp_rv2gv") { |
990 | $kid = $kid->first; |
991 | } |
9d2c6865 |
992 | return "<" . $self->deparse($kid, 1) . ">"; |
6e90668e |
993 | } |
994 | |
995 | sub loopex { |
996 | my $self = shift; |
9d2c6865 |
997 | my ($op, $cx, $name) = @_; |
6e90668e |
998 | if (class($op) eq "PVOP") { |
9d2c6865 |
999 | return "$name " . $op->pv; |
1000 | } elsif (class($op) eq "OP") { |
1001 | return $name; |
6e90668e |
1002 | } elsif (class($op) eq "UNOP") { |
9d2c6865 |
1003 | # Note -- loop exits are actually exempt from the |
1004 | # looks-like-a-func rule, but a few extra parens won't hurt |
1005 | return $self->maybe_parens_unop($name, $op->first, $cx); |
6e90668e |
1006 | } |
6e90668e |
1007 | } |
1008 | |
1009 | sub pp_last { loopex(@_, "last") } |
1010 | sub pp_next { loopex(@_, "next") } |
1011 | sub pp_redo { loopex(@_, "redo") } |
1012 | sub pp_goto { loopex(@_, "goto") } |
1013 | sub pp_dump { loopex(@_, "dump") } |
1014 | |
1015 | sub ftst { |
1016 | my $self = shift; |
9d2c6865 |
1017 | my($op, $cx, $name) = @_; |
6e90668e |
1018 | if (class($op) eq "UNOP") { |
9d2c6865 |
1019 | # Genuine `-X' filetests are exempt from the LLAFR, but not |
1020 | # l?stat(); for the sake of clarity, give'em all parens |
1021 | return $self->maybe_parens_unop($name, $op->first, $cx); |
6e90668e |
1022 | } elsif (class($op) eq "GVOP") { |
9d2c6865 |
1023 | return $self->maybe_parens_func($name, $self->pp_gv($op, 1), $cx, 16); |
6e90668e |
1024 | } else { # I don't think baseop filetests ever survive ck_ftst, but... |
9d2c6865 |
1025 | return $name; |
6e90668e |
1026 | } |
6e90668e |
1027 | } |
1028 | |
1029 | sub pp_lstat { ftst(@_, "lstat") } |
1030 | sub pp_stat { ftst(@_, "stat") } |
1031 | sub pp_ftrread { ftst(@_, "-R") } |
1032 | sub pp_ftrwrite { ftst(@_, "-W") } |
1033 | sub pp_ftrexec { ftst(@_, "-X") } |
1034 | sub pp_fteread { ftst(@_, "-r") } |
1035 | sub pp_ftewrite { ftst(@_, "-r") } |
1036 | sub pp_fteexec { ftst(@_, "-r") } |
1037 | sub pp_ftis { ftst(@_, "-e") } |
1038 | sub pp_fteowned { ftst(@_, "-O") } |
1039 | sub pp_ftrowned { ftst(@_, "-o") } |
1040 | sub pp_ftzero { ftst(@_, "-z") } |
1041 | sub pp_ftsize { ftst(@_, "-s") } |
1042 | sub pp_ftmtime { ftst(@_, "-M") } |
1043 | sub pp_ftatime { ftst(@_, "-A") } |
1044 | sub pp_ftctime { ftst(@_, "-C") } |
1045 | sub pp_ftsock { ftst(@_, "-S") } |
1046 | sub pp_ftchr { ftst(@_, "-c") } |
1047 | sub pp_ftblk { ftst(@_, "-b") } |
1048 | sub pp_ftfile { ftst(@_, "-f") } |
1049 | sub pp_ftdir { ftst(@_, "-d") } |
1050 | sub pp_ftpipe { ftst(@_, "-p") } |
1051 | sub pp_ftlink { ftst(@_, "-l") } |
1052 | sub pp_ftsuid { ftst(@_, "-u") } |
1053 | sub pp_ftsgid { ftst(@_, "-g") } |
1054 | sub pp_ftsvtx { ftst(@_, "-k") } |
1055 | sub pp_fttty { ftst(@_, "-t") } |
1056 | sub pp_fttext { ftst(@_, "-T") } |
1057 | sub pp_ftbinary { ftst(@_, "-B") } |
1058 | |
a798dbf2 |
1059 | sub SWAP_CHILDREN () { 1 } |
6e90668e |
1060 | sub ASSIGN () { 2 } # has OP= variant |
1061 | |
1062 | sub OPf_STACKED () { 64 } |
a798dbf2 |
1063 | |
9d2c6865 |
1064 | my(%left, %right); |
1065 | |
1066 | sub assoc_class { |
1067 | my $op = shift; |
1068 | my $name = $op->ppaddr; |
1069 | if ($name eq "pp_concat" and $op->first->ppaddr eq "pp_concat") { |
1070 | # avoid spurious `=' -- see comment in pp_concat |
1071 | return "pp_concat"; |
1072 | } |
1073 | if ($name eq "pp_null" and class($op) eq "UNOP" |
1074 | and $op->first->ppaddr =~ /^pp_(and|x?or)$/ |
1075 | and null $op->first->sibling) |
1076 | { |
1077 | # Like all conditional constructs, OP_ANDs and OP_ORs are topped |
1078 | # with a null that's used as the common end point of the two |
1079 | # flows of control. For precedence purposes, ignore it. |
1080 | # (COND_EXPRs have these too, but we don't bother with |
1081 | # their associativity). |
1082 | return assoc_class($op->first); |
1083 | } |
1084 | return $name . ($op->flags & OPf_STACKED ? "=" : ""); |
1085 | } |
1086 | |
1087 | # Left associative operators, like `+', for which |
1088 | # $a + $b + $c is equivalent to ($a + $b) + $c |
1089 | |
1090 | BEGIN { |
1091 | %left = ('pp_multiply' => 19, 'pp_i_multiply' => 19, |
1092 | 'pp_divide' => 19, 'pp_i_divide' => 19, |
1093 | 'pp_modulo' => 19, 'pp_i_modulo' => 19, |
1094 | 'pp_repeat' => 19, |
1095 | 'pp_add' => 18, 'pp_i_add' => 18, |
1096 | 'pp_subtract' => 18, 'pp_i_subtract' => 18, |
1097 | 'pp_concat' => 18, |
1098 | 'pp_left_shift' => 17, 'pp_right_shift' => 17, |
1099 | 'pp_bit_and' => 13, |
1100 | 'pp_bit_or' => 12, 'pp_bit_xor' => 12, |
1101 | 'pp_and' => 3, |
1102 | 'pp_or' => 2, 'pp_xor' => 2, |
1103 | ); |
1104 | } |
1105 | |
1106 | sub deparse_binop_left { |
1107 | my $self = shift; |
1108 | my($op, $left, $prec) = @_; |
1109 | if ($left{assoc_class($op)} |
1110 | and $left{assoc_class($op)} == $left{assoc_class($left)}) |
1111 | { |
1112 | return $self->deparse($left, $prec - .00001); |
1113 | } else { |
1114 | return $self->deparse($left, $prec); |
1115 | } |
1116 | } |
1117 | |
1118 | # Right associative operators, like `=', for which |
1119 | # $a = $b = $c is equivalent to $a = ($b = $c) |
1120 | |
1121 | BEGIN { |
1122 | %right = ('pp_pow' => 22, |
1123 | 'pp_sassign=' => 7, 'pp_aassign=' => 7, |
1124 | 'pp_multiply=' => 7, 'pp_i_multiply=' => 7, |
1125 | 'pp_divide=' => 7, 'pp_i_divide=' => 7, |
1126 | 'pp_modulo=' => 7, 'pp_i_modulo=' => 7, |
1127 | 'pp_repeat=' => 7, |
1128 | 'pp_add=' => 7, 'pp_i_add=' => 7, |
1129 | 'pp_subtract=' => 7, 'pp_i_subtract=' => 7, |
1130 | 'pp_concat=' => 7, |
1131 | 'pp_left_shift=' => 7, 'pp_right_shift=' => 7, |
1132 | 'pp_bit_and=' => 7, |
1133 | 'pp_bit_or=' => 7, 'pp_bit_xor=' => 7, |
1134 | 'pp_andassign' => 7, |
1135 | 'pp_orassign' => 7, |
1136 | ); |
1137 | } |
1138 | |
1139 | sub deparse_binop_right { |
1140 | my $self = shift; |
1141 | my($op, $right, $prec) = @_; |
1142 | if ($right{assoc_class($op)} |
1143 | and $right{assoc_class($op)} == $right{assoc_class($right)}) |
1144 | { |
1145 | return $self->deparse($right, $prec - .00001); |
1146 | } else { |
1147 | return $self->deparse($right, $prec); |
1148 | } |
1149 | } |
1150 | |
a798dbf2 |
1151 | sub binop { |
6e90668e |
1152 | my $self = shift; |
9d2c6865 |
1153 | my ($op, $cx, $opname, $prec, $flags) = (@_, 0); |
a798dbf2 |
1154 | my $left = $op->first; |
1155 | my $right = $op->last; |
9d2c6865 |
1156 | my $eq = ""; |
1157 | if ($op->flags & OPf_STACKED && $flags & ASSIGN) { |
1158 | $eq = "="; |
1159 | $prec = 7; |
1160 | } |
a798dbf2 |
1161 | if ($flags & SWAP_CHILDREN) { |
1162 | ($left, $right) = ($right, $left); |
1163 | } |
9d2c6865 |
1164 | $left = $self->deparse_binop_left($op, $left, $prec); |
1165 | $right = $self->deparse_binop_right($op, $right, $prec); |
1166 | return $self->maybe_parens("$left $opname$eq $right", $cx, $prec); |
1167 | } |
1168 | |
1169 | sub pp_add { binop(@_, "+", 18, ASSIGN) } |
1170 | sub pp_multiply { binop(@_, "*", 19, ASSIGN) } |
1171 | sub pp_subtract { binop(@_, "-",18, ASSIGN) } |
1172 | sub pp_divide { binop(@_, "/", 19, ASSIGN) } |
1173 | sub pp_modulo { binop(@_, "%", 19, ASSIGN) } |
1174 | sub pp_i_add { binop(@_, "+", 18, ASSIGN) } |
1175 | sub pp_i_multiply { binop(@_, "*", 19, ASSIGN) } |
1176 | sub pp_i_subtract { binop(@_, "-", 18, ASSIGN) } |
1177 | sub pp_i_divide { binop(@_, "/", 19, ASSIGN) } |
1178 | sub pp_i_modulo { binop(@_, "%", 19, ASSIGN) } |
1179 | sub pp_pow { binop(@_, "**", 22, ASSIGN) } |
1180 | |
1181 | sub pp_left_shift { binop(@_, "<<", 17, ASSIGN) } |
1182 | sub pp_right_shift { binop(@_, ">>", 17, ASSIGN) } |
1183 | sub pp_bit_and { binop(@_, "&", 13, ASSIGN) } |
1184 | sub pp_bit_or { binop(@_, "|", 12, ASSIGN) } |
1185 | sub pp_bit_xor { binop(@_, "^", 12, ASSIGN) } |
1186 | |
1187 | sub pp_eq { binop(@_, "==", 14) } |
1188 | sub pp_ne { binop(@_, "!=", 14) } |
1189 | sub pp_lt { binop(@_, "<", 15) } |
1190 | sub pp_gt { binop(@_, ">", 15) } |
1191 | sub pp_ge { binop(@_, ">=", 15) } |
1192 | sub pp_le { binop(@_, "<=", 15) } |
1193 | sub pp_ncmp { binop(@_, "<=>", 14) } |
1194 | sub pp_i_eq { binop(@_, "==", 14) } |
1195 | sub pp_i_ne { binop(@_, "!=", 14) } |
1196 | sub pp_i_lt { binop(@_, "<", 15) } |
1197 | sub pp_i_gt { binop(@_, ">", 15) } |
1198 | sub pp_i_ge { binop(@_, ">=", 15) } |
1199 | sub pp_i_le { binop(@_, "<=", 15) } |
1200 | sub pp_i_ncmp { binop(@_, "<=>", 14) } |
1201 | |
1202 | sub pp_seq { binop(@_, "eq", 14) } |
1203 | sub pp_sne { binop(@_, "ne", 14) } |
1204 | sub pp_slt { binop(@_, "lt", 15) } |
1205 | sub pp_sgt { binop(@_, "gt", 15) } |
1206 | sub pp_sge { binop(@_, "ge", 15) } |
1207 | sub pp_sle { binop(@_, "le", 15) } |
1208 | sub pp_scmp { binop(@_, "cmp", 14) } |
1209 | |
1210 | sub pp_sassign { binop(@_, "=", 7, SWAP_CHILDREN) } |
1211 | sub pp_aassign { binop(@_, "=", 7, SWAP_CHILDREN) } |
6e90668e |
1212 | |
1213 | # `.' is special because concats-of-concats are optimized to save copying |
1214 | # by making all but the first concat stacked. The effect is as if the |
1215 | # programmer had written `($a . $b) .= $c', except legal. |
1216 | sub pp_concat { |
1217 | my $self = shift; |
9d2c6865 |
1218 | my($op, $cx) = @_; |
6e90668e |
1219 | my $left = $op->first; |
1220 | my $right = $op->last; |
1221 | my $eq = ""; |
9d2c6865 |
1222 | my $prec = 18; |
6e90668e |
1223 | if ($op->flags & OPf_STACKED and $op->first->ppaddr ne "pp_concat") { |
1224 | $eq = "="; |
9d2c6865 |
1225 | $prec = 7; |
6e90668e |
1226 | } |
9d2c6865 |
1227 | $left = $self->deparse_binop_left($op, $left, $prec); |
1228 | $right = $self->deparse_binop_right($op, $right, $prec); |
1229 | return $self->maybe_parens("$left .$eq $right", $cx, $prec); |
6e90668e |
1230 | } |
1231 | |
1232 | # `x' is weird when the left arg is a list |
1233 | sub pp_repeat { |
1234 | my $self = shift; |
9d2c6865 |
1235 | my($op, $cx) = @_; |
6e90668e |
1236 | my $left = $op->first; |
1237 | my $right = $op->last; |
9d2c6865 |
1238 | my $eq = ""; |
1239 | my $prec = 19; |
1240 | if ($op->flags & OPf_STACKED) { |
1241 | $eq = "="; |
1242 | $prec = 7; |
1243 | } |
6e90668e |
1244 | if (null($right)) { # list repeat; count is inside left-side ex-list |
1245 | my $kid = $left->first->sibling; # skip pushmark |
1246 | my @exprs; |
1247 | for (; !null($kid->sibling); $kid = $kid->sibling) { |
9d2c6865 |
1248 | push @exprs, $self->deparse($kid, 6); |
6e90668e |
1249 | } |
1250 | $right = $kid; |
1251 | $left = "(" . join(", ", @exprs). ")"; |
1252 | } else { |
9d2c6865 |
1253 | $left = $self->deparse_binop_left($op, $left, $prec); |
6e90668e |
1254 | } |
9d2c6865 |
1255 | $right = $self->deparse_binop_right($op, $right, $prec); |
1256 | return $self->maybe_parens("$left x$eq $right", $cx, $prec); |
6e90668e |
1257 | } |
1258 | |
1259 | sub range { |
1260 | my $self = shift; |
9d2c6865 |
1261 | my ($op, $cx, $type) = @_; |
6e90668e |
1262 | my $left = $op->first; |
1263 | my $right = $left->sibling; |
9d2c6865 |
1264 | $left = $self->deparse($left, 9); |
1265 | $right = $self->deparse($right, 9); |
1266 | return $self->maybe_parens("$left $type $right", $cx, 9); |
6e90668e |
1267 | } |
1268 | |
1269 | sub pp_flop { |
1270 | my $self = shift; |
9d2c6865 |
1271 | my($op, $cx) = @_; |
6e90668e |
1272 | my $flip = $op->first; |
1273 | my $type = ($flip->flags & OPf_SPECIAL) ? "..." : ".."; |
9d2c6865 |
1274 | return $self->range($flip->first, $cx, $type); |
6e90668e |
1275 | } |
1276 | |
1277 | # one-line while/until is handled in pp_leave |
1278 | |
1279 | sub logop { |
1280 | my $self = shift; |
9d2c6865 |
1281 | my ($op, $cx, $lowop, $lowprec, $highop, $highprec, $blockname) = @_; |
6e90668e |
1282 | my $left = $op->first; |
1283 | my $right = $op->first->sibling; |
9d2c6865 |
1284 | if ($cx == 0 and is_scope($right) and $blockname) { # if ($a) {$b} |
1285 | $left = $self->deparse($left, 1); |
1286 | $right = $self->deparse($right, 0); |
1287 | return "$blockname ($left) {\n\t$right\n\b}\cK"; |
1288 | } elsif ($cx == 0 and $blockname and not $self->{'parens'}) { # $b if $a |
1289 | $right = $self->deparse($right, 1); |
1290 | $left = $self->deparse($left, 1); |
1291 | return "$right $blockname $left"; |
1292 | } elsif ($cx > $lowprec and $highop) { # $a && $b |
1293 | $left = $self->deparse_binop_left($op, $left, $highprec); |
1294 | $right = $self->deparse_binop_right($op, $right, $highprec); |
1295 | return $self->maybe_parens("$left $highop $right", $cx, $highprec); |
1296 | } else { # $a and $b |
1297 | $left = $self->deparse_binop_left($op, $left, $lowprec); |
1298 | $right = $self->deparse_binop_right($op, $right, $lowprec); |
1299 | return $self->maybe_parens("$left $lowop $right", $cx, $lowprec); |
1300 | } |
1301 | } |
1302 | |
1303 | sub pp_and { logop(@_, "and", 3, "&&", 11, "if") } |
1304 | sub pp_or { logop(@_, "or", 2, "||", 10, "unless") } |
1305 | sub pp_xor { logop(@_, "xor", 2, "", 0, "") } |
6e90668e |
1306 | |
1307 | sub logassignop { |
1308 | my $self = shift; |
9d2c6865 |
1309 | my ($op, $cx, $opname) = @_; |
6e90668e |
1310 | my $left = $op->first; |
1311 | my $right = $op->first->sibling->first; # skip sassign |
9d2c6865 |
1312 | $left = $self->deparse($left, 7); |
1313 | $right = $self->deparse($right, 7); |
1314 | return $self->maybe_parens("$left $opname $right", $cx, 7); |
a798dbf2 |
1315 | } |
1316 | |
6e90668e |
1317 | sub pp_andassign { logassignop(@_, "&&=") } |
1318 | sub pp_orassign { logassignop(@_, "||=") } |
1319 | |
1320 | sub listop { |
1321 | my $self = shift; |
9d2c6865 |
1322 | my($op, $cx, $name) = @_; |
1323 | my(@exprs); |
1324 | my $parens = ($cx >= 5) || $self->{'parens'}; |
1325 | my $kid = $op->first->sibling; |
1326 | return $name if null $kid; |
1327 | my $first = $self->deparse($kid, 6); |
1328 | $first = "+$first" if not $parens and substr($first, 0, 1) eq "("; |
1329 | push @exprs, $first; |
1330 | $kid = $kid->sibling; |
1331 | for (; !null($kid); $kid = $kid->sibling) { |
1332 | push @exprs, $self->deparse($kid, 6); |
1333 | } |
1334 | if ($parens) { |
1335 | return "$name(" . join(", ", @exprs) . ")"; |
1336 | } else { |
1337 | return "$name " . join(", ", @exprs); |
6e90668e |
1338 | } |
6e90668e |
1339 | } |
a798dbf2 |
1340 | |
6e90668e |
1341 | sub pp_bless { listop(@_, "bless") } |
1342 | sub pp_atan2 { listop(@_, "atan2") } |
1343 | sub pp_substr { maybe_local(@_, listop(@_, "substr")) } |
1344 | sub pp_vec { maybe_local(@_, listop(@_, "vec")) } |
1345 | sub pp_index { listop(@_, "index") } |
1346 | sub pp_rindex { listop(@_, "rindex") } |
1347 | sub pp_sprintf { listop(@_, "sprintf") } |
1348 | sub pp_formline { listop(@_, "formline") } # see also deparse_format |
1349 | sub pp_crypt { listop(@_, "crypt") } |
1350 | sub pp_unpack { listop(@_, "unpack") } |
1351 | sub pp_pack { listop(@_, "pack") } |
1352 | sub pp_join { listop(@_, "join") } |
1353 | sub pp_splice { listop(@_, "splice") } |
1354 | sub pp_push { listop(@_, "push") } |
1355 | sub pp_unshift { listop(@_, "unshift") } |
1356 | sub pp_reverse { listop(@_, "reverse") } |
1357 | sub pp_warn { listop(@_, "warn") } |
1358 | sub pp_die { listop(@_, "die") } |
9d2c6865 |
1359 | # Actually, return is exempt from the LLAFR (see examples in this very |
1360 | # module!), but for consistency's sake, ignore that fact |
6e90668e |
1361 | sub pp_return { listop(@_, "return") } |
1362 | sub pp_open { listop(@_, "open") } |
1363 | sub pp_pipe_op { listop(@_, "pipe") } |
1364 | sub pp_tie { listop(@_, "tie") } |
1365 | sub pp_dbmopen { listop(@_, "dbmopen") } |
1366 | sub pp_sselect { listop(@_, "select") } |
1367 | sub pp_select { listop(@_, "select") } |
1368 | sub pp_read { listop(@_, "read") } |
1369 | sub pp_sysopen { listop(@_, "sysopen") } |
1370 | sub pp_sysseek { listop(@_, "sysseek") } |
1371 | sub pp_sysread { listop(@_, "sysread") } |
1372 | sub pp_syswrite { listop(@_, "syswrite") } |
1373 | sub pp_send { listop(@_, "send") } |
1374 | sub pp_recv { listop(@_, "recv") } |
1375 | sub pp_seek { listop(@_, "seek") } |
6e90668e |
1376 | sub pp_fcntl { listop(@_, "fcntl") } |
1377 | sub pp_ioctl { listop(@_, "ioctl") } |
1378 | sub pp_flock { listop(@_, "flock") } |
1379 | sub pp_socket { listop(@_, "socket") } |
1380 | sub pp_sockpair { listop(@_, "sockpair") } |
1381 | sub pp_bind { listop(@_, "bind") } |
1382 | sub pp_connect { listop(@_, "connect") } |
1383 | sub pp_listen { listop(@_, "listen") } |
1384 | sub pp_accept { listop(@_, "accept") } |
1385 | sub pp_shutdown { listop(@_, "shutdown") } |
1386 | sub pp_gsockopt { listop(@_, "getsockopt") } |
1387 | sub pp_ssockopt { listop(@_, "setsockopt") } |
1388 | sub pp_chown { listop(@_, "chown") } |
1389 | sub pp_unlink { listop(@_, "unlink") } |
1390 | sub pp_chmod { listop(@_, "chmod") } |
1391 | sub pp_utime { listop(@_, "utime") } |
1392 | sub pp_rename { listop(@_, "rename") } |
1393 | sub pp_link { listop(@_, "link") } |
1394 | sub pp_symlink { listop(@_, "symlink") } |
1395 | sub pp_mkdir { listop(@_, "mkdir") } |
1396 | sub pp_open_dir { listop(@_, "opendir") } |
1397 | sub pp_seekdir { listop(@_, "seekdir") } |
1398 | sub pp_waitpid { listop(@_, "waitpid") } |
1399 | sub pp_system { listop(@_, "system") } |
1400 | sub pp_exec { listop(@_, "exec") } |
1401 | sub pp_kill { listop(@_, "kill") } |
1402 | sub pp_setpgrp { listop(@_, "setpgrp") } |
1403 | sub pp_getpriority { listop(@_, "getpriority") } |
1404 | sub pp_setpriority { listop(@_, "setpriority") } |
1405 | sub pp_shmget { listop(@_, "shmget") } |
1406 | sub pp_shmctl { listop(@_, "shmctl") } |
1407 | sub pp_shmread { listop(@_, "shmread") } |
1408 | sub pp_shmwrite { listop(@_, "shmwrite") } |
1409 | sub pp_msgget { listop(@_, "msgget") } |
1410 | sub pp_msgctl { listop(@_, "msgctl") } |
1411 | sub pp_msgsnd { listop(@_, "msgsnd") } |
1412 | sub pp_msgrcv { listop(@_, "msgrcv") } |
1413 | sub pp_semget { listop(@_, "semget") } |
1414 | sub pp_semctl { listop(@_, "semctl") } |
1415 | sub pp_semop { listop(@_, "semop") } |
1416 | sub pp_ghbyaddr { listop(@_, "gethostbyaddr") } |
1417 | sub pp_gnbyaddr { listop(@_, "getnetbyaddr") } |
1418 | sub pp_gpbynumber { listop(@_, "getprotobynumber") } |
1419 | sub pp_gsbyname { listop(@_, "getservbyname") } |
1420 | sub pp_gsbyport { listop(@_, "getservbyport") } |
1421 | sub pp_syscall { listop(@_, "syscall") } |
1422 | |
1423 | sub pp_glob { |
1424 | my $self = shift; |
9d2c6865 |
1425 | my($op, $cx) = @_; |
6e90668e |
1426 | my $text = $self->dq($op->first->sibling); # skip pushmark |
1427 | if ($text =~ /^\$?(\w|::|\`)+$/ # could look like a readline |
1428 | or $text =~ /[<>]/) { |
1429 | return 'glob(' . single_delim('qq', '"', $text) . ')'; |
1430 | } else { |
1431 | return '<' . $text . '>'; |
1432 | } |
1433 | } |
1434 | |
f5aa8f4e |
1435 | # Truncate is special because OPf_SPECIAL makes a bareword first arg |
1436 | # be a filehandle. This could probably be better fixed in the core |
1437 | # by moving the GV lookup into ck_truc. |
1438 | |
1439 | sub pp_truncate { |
1440 | my $self = shift; |
1441 | my($op, $cx) = @_; |
1442 | my(@exprs); |
1443 | my $parens = ($cx >= 5) || $self->{'parens'}; |
1444 | my $kid = $op->first->sibling; |
acba1d67 |
1445 | my $fh; |
f5aa8f4e |
1446 | if ($op->flags & OPf_SPECIAL) { |
1447 | # $kid is an OP_CONST |
1448 | $fh = $kid->sv->PV; |
1449 | } else { |
1450 | $fh = $self->deparse($kid, 6); |
1451 | $fh = "+$fh" if not $parens and substr($fh, 0, 1) eq "("; |
1452 | } |
1453 | my $len = $self->deparse($kid->sibling, 6); |
1454 | if ($parens) { |
1455 | return "truncate($fh, $len)"; |
1456 | } else { |
1457 | return "truncate $fh, $len"; |
1458 | } |
1459 | |
1460 | } |
1461 | |
6e90668e |
1462 | sub indirop { |
1463 | my $self = shift; |
9d2c6865 |
1464 | my($op, $cx, $name) = @_; |
6e90668e |
1465 | my($expr, @exprs); |
1466 | my $kid = $op->first->sibling; |
1467 | my $indir = ""; |
1468 | if ($op->flags & OPf_STACKED) { |
1469 | $indir = $kid; |
1470 | $indir = $indir->first; # skip rv2gv |
1471 | if (is_scope($indir)) { |
9d2c6865 |
1472 | $indir = "{" . $self->deparse($indir, 0) . "}"; |
6e90668e |
1473 | } else { |
9d2c6865 |
1474 | $indir = $self->deparse($indir, 24); |
6e90668e |
1475 | } |
1476 | $indir = $indir . " "; |
1477 | $kid = $kid->sibling; |
1478 | } |
1479 | for (; !null($kid); $kid = $kid->sibling) { |
9d2c6865 |
1480 | $expr = $self->deparse($kid, 6); |
6e90668e |
1481 | push @exprs, $expr; |
1482 | } |
9d2c6865 |
1483 | return $self->maybe_parens_func($name, |
1484 | $indir . join(", ", @exprs), |
1485 | $cx, 5); |
6e90668e |
1486 | } |
1487 | |
1488 | sub pp_prtf { indirop(@_, "printf") } |
1489 | sub pp_print { indirop(@_, "print") } |
1490 | sub pp_sort { indirop(@_, "sort") } |
1491 | |
1492 | sub mapop { |
1493 | my $self = shift; |
9d2c6865 |
1494 | my($op, $cx, $name) = @_; |
6e90668e |
1495 | my($expr, @exprs); |
1496 | my $kid = $op->first; # this is the (map|grep)start |
1497 | $kid = $kid->first->sibling; # skip a pushmark |
1498 | my $code = $kid->first; # skip a null |
1499 | if (is_scope $code) { |
9d2c6865 |
1500 | $code = "{" . $self->deparse($code, 1) . "} "; |
6e90668e |
1501 | } else { |
9d2c6865 |
1502 | $code = $self->deparse($code, 24) . ", "; |
6e90668e |
1503 | } |
1504 | $kid = $kid->sibling; |
1505 | for (; !null($kid); $kid = $kid->sibling) { |
9d2c6865 |
1506 | $expr = $self->deparse($kid, 6); |
6e90668e |
1507 | push @exprs, $expr if $expr; |
1508 | } |
9d2c6865 |
1509 | return $self->maybe_parens_func($name, $code . join(", ", @exprs), $cx, 5); |
6e90668e |
1510 | } |
1511 | |
1512 | sub pp_mapwhile { mapop(@_, "map") } |
1513 | sub pp_grepwhile { mapop(@_, "grep") } |
1514 | |
1515 | sub pp_list { |
1516 | my $self = shift; |
9d2c6865 |
1517 | my($op, $cx) = @_; |
6e90668e |
1518 | my($expr, @exprs); |
1519 | my $kid = $op->first->sibling; # skip pushmark |
1520 | my $lop; |
1521 | my $local = "either"; # could be local(...) or my(...) |
1522 | for ($lop = $kid; !null($lop); $lop = $lop->sibling) { |
1523 | # This assumes that no other private flags equal 128, and that |
1524 | # OPs that store things other than flags in their op_private, |
1525 | # like OP_AELEMFAST, won't be immediate children of a list. |
1526 | unless ($lop->private & OPp_LVAL_INTRO or $lop->ppaddr eq "pp_undef") |
1527 | { |
1528 | $local = ""; # or not |
1529 | last; |
1530 | } |
1531 | if ($lop->ppaddr =~ /^pp_pad[ash]v$/) { # my() |
1532 | ($local = "", last) if $local eq "local"; |
1533 | $local = "my"; |
1534 | } elsif ($lop->ppaddr ne "pp_undef") { # local() |
1535 | ($local = "", last) if $local eq "my"; |
1536 | $local = "local"; |
1537 | } |
1538 | } |
1539 | $local = "" if $local eq "either"; # no point if it's all undefs |
f5aa8f4e |
1540 | return $self->deparse($kid, $cx) if null $kid->sibling and not $local; |
6e90668e |
1541 | for (; !null($kid); $kid = $kid->sibling) { |
1542 | if ($local) { |
1543 | if (class($kid) eq "UNOP" and $kid->first->ppaddr eq "pp_gvsv") { |
1544 | $lop = $kid->first; |
1545 | } else { |
1546 | $lop = $kid; |
1547 | } |
1548 | $self->{'avoid_local'}{$$lop}++; |
9d2c6865 |
1549 | $expr = $self->deparse($kid, 6); |
6e90668e |
1550 | delete $self->{'avoid_local'}{$$lop}; |
1551 | } else { |
9d2c6865 |
1552 | $expr = $self->deparse($kid, 6); |
6e90668e |
1553 | } |
1554 | push @exprs, $expr; |
1555 | } |
9d2c6865 |
1556 | if ($local) { |
1557 | return "$local(" . join(", ", @exprs) . ")"; |
1558 | } else { |
1559 | return $self->maybe_parens( join(", ", @exprs), $cx, 6); |
1560 | } |
6e90668e |
1561 | } |
1562 | |
1563 | sub pp_cond_expr { |
1564 | my $self = shift; |
9d2c6865 |
1565 | my($op, $cx) = @_; |
6e90668e |
1566 | my $cond = $op->first; |
1567 | my $true = $cond->sibling; |
1568 | my $false = $true->sibling; |
9d2c6865 |
1569 | my $cuddle = $self->{'cuddle'}; |
9d2c6865 |
1570 | unless ($cx == 0 and is_scope($true) and is_scope($false)) { |
f5aa8f4e |
1571 | $cond = $self->deparse($cond, 8); |
9d2c6865 |
1572 | $true = $self->deparse($true, 8); |
1573 | $false = $self->deparse($false, 8); |
1574 | return $self->maybe_parens("$cond ? $true : $false", $cx, 8); |
1575 | } |
f5aa8f4e |
1576 | $cond = $self->deparse($cond, 1); |
9d2c6865 |
1577 | $true = $self->deparse($true, 0); |
6e90668e |
1578 | if ($false->ppaddr eq "pp_lineseq") { # braces w/o scope => elsif |
1579 | my $head = "if ($cond) {\n\t$true\n\b}"; |
1580 | my @elsifs; |
1581 | while (!null($false) and $false->ppaddr eq "pp_lineseq") { |
1582 | my $newop = $false->first->sibling->first; |
1583 | my $newcond = $newop->first; |
1584 | my $newtrue = $newcond->sibling; |
1585 | $false = $newtrue->sibling; # last in chain is OP_AND => no else |
9d2c6865 |
1586 | $newcond = $self->deparse($newcond, 1); |
1587 | $newtrue = $self->deparse($newtrue, 0); |
6e90668e |
1588 | push @elsifs, "elsif ($newcond) {\n\t$newtrue\n\b}"; |
1589 | } |
1590 | if (!null($false)) { |
9d2c6865 |
1591 | $false = $cuddle . "else {\n\t" . |
1592 | $self->deparse($false, 0) . "\n\b}\cK"; |
6e90668e |
1593 | } else { |
9d2c6865 |
1594 | $false = "\cK"; |
6e90668e |
1595 | } |
9d2c6865 |
1596 | return $head . join($cuddle, "", @elsifs) . $false; |
6e90668e |
1597 | } |
9d2c6865 |
1598 | $false = $self->deparse($false, 0); |
1599 | return "if ($cond) {\n\t$true\n\b}${cuddle}else {\n\t$false\n\b}\cK"; |
6e90668e |
1600 | } |
1601 | |
1602 | sub pp_leaveloop { |
1603 | my $self = shift; |
9d2c6865 |
1604 | my($op, $cx) = @_; |
6e90668e |
1605 | my $enter = $op->first; |
1606 | my $kid = $enter->sibling; |
1607 | local($self->{'curstash'}) = $self->{'curstash'}; |
1608 | my $head = ""; |
9d2c6865 |
1609 | my $bare = 0; |
6e90668e |
1610 | if ($kid->ppaddr eq "pp_lineseq") { # bare or infinite loop |
1611 | if (is_state $kid->last) { # infinite |
1612 | $head = "for (;;) "; # shorter than while (1) |
9d2c6865 |
1613 | } else { |
1614 | $bare = 1; |
6e90668e |
1615 | } |
1616 | } elsif ($enter->ppaddr eq "pp_enteriter") { # foreach |
1617 | my $ary = $enter->first->sibling; # first was pushmark |
1618 | my $var = $ary->sibling; |
f5aa8f4e |
1619 | if ($enter->flags & OPf_STACKED |
1620 | and not null $ary->first->sibling->sibling) |
1621 | { |
d7f5b6da |
1622 | $ary = $self->deparse($ary->first->sibling, 9) . " .. " . |
1623 | $self->deparse($ary->first->sibling->sibling, 9); |
d8d95777 |
1624 | } else { |
1625 | $ary = $self->deparse($ary, 1); |
1626 | } |
6e90668e |
1627 | if (null $var) { |
f6f9bdb7 |
1628 | if ($enter->flags & OPf_SPECIAL) { # thread special var |
9d2c6865 |
1629 | $var = $self->pp_threadsv($enter, 1); |
f6f9bdb7 |
1630 | } else { # regular my() variable |
9d2c6865 |
1631 | $var = $self->pp_padsv($enter, 1); |
f6f9bdb7 |
1632 | if ($self->padname_sv($enter->targ)->IVX == |
1633 | $kid->first->first->sibling->last->cop_seq) |
1634 | { |
1635 | # If the scope of this variable closes at the last |
1636 | # statement of the loop, it must have been |
1637 | # declared here. |
1638 | $var = "my " . $var; |
1639 | } |
6e90668e |
1640 | } |
1641 | } elsif ($var->ppaddr eq "pp_rv2gv") { |
9d2c6865 |
1642 | $var = $self->pp_rv2sv($var, 1); |
6e90668e |
1643 | } elsif ($var->ppaddr eq "pp_gv") { |
9d2c6865 |
1644 | $var = "\$" . $self->deparse($var, 1); |
6e90668e |
1645 | } |
9d2c6865 |
1646 | $head = "foreach $var ($ary) "; |
6e90668e |
1647 | $kid = $kid->first->first->sibling; # skip OP_AND and OP_ITER |
1648 | } elsif ($kid->ppaddr eq "pp_null") { # while/until |
1649 | $kid = $kid->first; |
1650 | my $name = {"pp_and" => "while", "pp_or" => "until"} |
1651 | ->{$kid->ppaddr}; |
9d2c6865 |
1652 | $head = "$name (" . $self->deparse($kid->first, 1) . ") "; |
6e90668e |
1653 | $kid = $kid->first->sibling; |
9d2c6865 |
1654 | } elsif ($kid->ppaddr eq "pp_stub") { # bare and empty |
1655 | return "{;}"; # {} could be a hashref |
6e90668e |
1656 | } |
1657 | # The third-to-last kid is the continue block if the pointer used |
9d2c6865 |
1658 | # by `next BLOCK' points to its first OP, which happens to be the |
1659 | # the op_next of the head of the _previous_ statement. |
1660 | # Unless it's a bare loop, in which case it's last, since there's |
1661 | # no unstack or extra nextstate. |
f5aa8f4e |
1662 | # Except if the previous head isn't null but the first kid is |
1663 | # (because it's a nulled out nextstate in a scope), in which |
1664 | # case the head's next is advanced past the null but the nextop's |
1665 | # isn't, so we need to try nextop->next. |
9d2c6865 |
1666 | my($cont, $precont); |
1667 | if ($bare) { |
6e90668e |
1668 | $cont = $kid->first; |
9d2c6865 |
1669 | while (!null($cont->sibling)) { |
1670 | $precont = $cont; |
1671 | $cont = $cont->sibling; |
1672 | } |
1673 | } else { |
1674 | $cont = $kid->first; |
1675 | while (!null($cont->sibling->sibling->sibling)) { |
1676 | $precont = $cont; |
1677 | $cont = $cont->sibling; |
6e90668e |
1678 | } |
1679 | } |
f5aa8f4e |
1680 | if ($precont and $ {$precont->next} == $ {$enter->nextop} |
1681 | || $ {$precont->next} == $ {$enter->nextop->next} ) |
1682 | { |
1683 | my $state = $kid->first; |
1684 | my $cuddle = $self->{'cuddle'}; |
1685 | my($expr, @exprs); |
1686 | for (; $$state != $$cont; $state = $state->sibling) { |
1687 | $expr = ""; |
1688 | if (is_state $state) { |
1689 | $expr = $self->deparse($state, 0); |
1690 | $state = $state->sibling; |
1691 | last if null $kid; |
1692 | } |
1693 | $expr .= $self->deparse($state, 0); |
1694 | push @exprs, $expr if $expr; |
1695 | } |
1696 | $kid = join(";\n", @exprs); |
1697 | $cont = $cuddle . "continue {\n\t" . |
1698 | $self->deparse($cont, 0) . "\n\b}\cK"; |
6e90668e |
1699 | } else { |
9d2c6865 |
1700 | $cont = "\cK"; |
1701 | $kid = $self->deparse($kid, 0); |
6e90668e |
1702 | } |
1703 | return $head . "{\n\t" . $kid . "\n\b}" . $cont; |
1704 | } |
1705 | |
1706 | sub pp_leavetry { |
1707 | my $self = shift; |
9d2c6865 |
1708 | return "eval {\n\t" . $self->pp_leave(@_) . "\n\b}"; |
6e90668e |
1709 | } |
1710 | |
1711 | sub OP_CONST () { 5 } |
f5aa8f4e |
1712 | |
1713 | # XXX need a better way to do this |
1714 | sub OP_STRINGIFY () { $] > 5.004_72 ? 67 : 65 } |
a798dbf2 |
1715 | |
1716 | sub pp_null { |
6e90668e |
1717 | my $self = shift; |
9d2c6865 |
1718 | my($op, $cx) = @_; |
6e90668e |
1719 | if (class($op) eq "OP") { |
1720 | return "'???'" if $op->targ == OP_CONST; # old value is lost |
1721 | } elsif ($op->first->ppaddr eq "pp_pushmark") { |
9d2c6865 |
1722 | return $self->pp_list($op, $cx); |
6e90668e |
1723 | } elsif ($op->first->ppaddr eq "pp_enter") { |
9d2c6865 |
1724 | return $self->pp_leave($op, $cx); |
6e90668e |
1725 | } elsif ($op->targ == OP_STRINGIFY) { |
1726 | return $self->dquote($op); |
1727 | } elsif (!null($op->first->sibling) and |
1728 | $op->first->sibling->ppaddr eq "pp_readline" and |
1729 | $op->first->sibling->flags & OPf_STACKED) { |
9d2c6865 |
1730 | return $self->maybe_parens($self->deparse($op->first, 7) . " = " |
1731 | . $self->deparse($op->first->sibling, 7), |
1732 | $cx, 7); |
6e90668e |
1733 | } elsif (!null($op->first->sibling) and |
1734 | $op->first->sibling->ppaddr eq "pp_trans" and |
1735 | $op->first->sibling->flags & OPf_STACKED) { |
9d2c6865 |
1736 | return $self->maybe_parens($self->deparse($op->first, 20) . " =~ " |
1737 | . $self->deparse($op->first->sibling, 20), |
1738 | $cx, 20); |
6e90668e |
1739 | } else { |
9d2c6865 |
1740 | return $self->deparse($op->first, $cx); |
6e90668e |
1741 | } |
a798dbf2 |
1742 | } |
1743 | |
6e90668e |
1744 | sub padname { |
1745 | my $self = shift; |
1746 | my $targ = shift; |
1747 | my $str = $self->padname_sv($targ)->PV; |
1748 | return padname_fix($str); |
1749 | } |
1750 | |
1751 | sub padany { |
1752 | my $self = shift; |
1753 | my $op = shift; |
1754 | return substr($self->padname($op->targ), 1); # skip $/@/% |
1755 | } |
1756 | |
1757 | sub pp_padsv { |
1758 | my $self = shift; |
9d2c6865 |
1759 | my($op, $cx) = @_; |
1760 | return $self->maybe_my($op, $cx, $self->padname($op->targ)); |
6e90668e |
1761 | } |
1762 | |
1763 | sub pp_padav { pp_padsv(@_) } |
1764 | sub pp_padhv { pp_padsv(@_) } |
1765 | |
9d2c6865 |
1766 | my @threadsv_names; |
1767 | |
1768 | BEGIN { |
1769 | @threadsv_names = ("_", "1", "2", "3", "4", "5", "6", "7", "8", "9", |
1770 | "&", "`", "'", "+", "/", ".", ",", "\\", '"', ";", |
1771 | "^", "-", "%", "=", "|", "~", ":", "^A", "^E", |
1772 | "!", "@"); |
1773 | } |
f6f9bdb7 |
1774 | |
1775 | sub pp_threadsv { |
1776 | my $self = shift; |
9d2c6865 |
1777 | my($op, $cx) = @_; |
1778 | return $self->maybe_local($op, $cx, "\$" . $threadsv_names[$op->targ]); |
f6f9bdb7 |
1779 | } |
1780 | |
6e90668e |
1781 | sub pp_gvsv { |
1782 | my $self = shift; |
9d2c6865 |
1783 | my($op, $cx) = @_; |
1784 | return $self->maybe_local($op, $cx, "\$" . $self->gv_name($op->gv)); |
6e90668e |
1785 | } |
1786 | |
1787 | sub pp_gv { |
1788 | my $self = shift; |
9d2c6865 |
1789 | my($op, $cx) = @_; |
6e90668e |
1790 | return $self->gv_name($op->gv); |
1791 | } |
1792 | |
1793 | sub pp_aelemfast { |
1794 | my $self = shift; |
9d2c6865 |
1795 | my($op, $cx) = @_; |
6e90668e |
1796 | my $gv = $op->gv; |
1797 | return "\$" . $self->gv_name($gv) . "[" . $op->private . "]"; |
1798 | } |
1799 | |
1800 | sub rv2x { |
1801 | my $self = shift; |
9d2c6865 |
1802 | my($op, $cx, $type) = @_; |
6e90668e |
1803 | my $kid = $op->first; |
f5aa8f4e |
1804 | my $str = $self->deparse($kid, 0); |
1805 | return $type . (is_scalar($kid) ? $str : "{$str}"); |
6e90668e |
1806 | } |
1807 | |
1808 | sub pp_rv2sv { maybe_local(@_, rv2x(@_, "\$")) } |
1809 | sub pp_rv2hv { maybe_local(@_, rv2x(@_, "%")) } |
1810 | sub pp_rv2gv { maybe_local(@_, rv2x(@_, "*")) } |
1811 | |
1812 | # skip rv2av |
1813 | sub pp_av2arylen { |
1814 | my $self = shift; |
9d2c6865 |
1815 | my($op, $cx) = @_; |
6e90668e |
1816 | if ($op->first->ppaddr eq "pp_padav") { |
9d2c6865 |
1817 | return $self->maybe_local($op, $cx, '$#' . $self->padany($op->first)); |
6e90668e |
1818 | } else { |
f5aa8f4e |
1819 | return $self->maybe_local($op, $cx, |
1820 | $self->rv2x($op->first, $cx, '$#')); |
6e90668e |
1821 | } |
1822 | } |
1823 | |
1824 | # skip down to the old, ex-rv2cv |
9d2c6865 |
1825 | sub pp_rv2cv { $_[0]->rv2x($_[1]->first->first->sibling, $_[2], "&") } |
6e90668e |
1826 | |
1827 | sub pp_rv2av { |
1828 | my $self = shift; |
9d2c6865 |
1829 | my($op, $cx) = @_; |
6e90668e |
1830 | my $kid = $op->first; |
1831 | if ($kid->ppaddr eq "pp_const") { # constant list |
1832 | my $av = $kid->sv; |
1833 | return "(" . join(", ", map(const($_), $av->ARRAY)) . ")"; |
1834 | } else { |
9d2c6865 |
1835 | return $self->maybe_local($op, $cx, $self->rv2x($op, $cx, "\@")); |
6e90668e |
1836 | } |
1837 | } |
1838 | |
1839 | |
1840 | sub elem { |
1841 | my $self = shift; |
9d2c6865 |
1842 | my ($op, $cx, $left, $right, $padname) = @_; |
6e90668e |
1843 | my($array, $idx) = ($op->first, $op->first->sibling); |
1844 | unless ($array->ppaddr eq $padname) { # Maybe this has been fixed |
1845 | $array = $array->first; # skip rv2av (or ex-rv2av in _53+) |
1846 | } |
1847 | if ($array->ppaddr eq $padname) { |
1848 | $array = $self->padany($array); |
1849 | } elsif (is_scope($array)) { # ${expr}[0] |
9d2c6865 |
1850 | $array = "{" . $self->deparse($array, 0) . "}"; |
6e90668e |
1851 | } elsif (is_scalar $array) { # $x[0], $$x[0], ... |
9d2c6865 |
1852 | $array = $self->deparse($array, 24); |
6e90668e |
1853 | } else { |
1854 | # $x[20][3]{hi} or expr->[20] |
1855 | my $arrow; |
1856 | $arrow = "->" if $array->ppaddr !~ /^pp_[ah]elem$/; |
9d2c6865 |
1857 | return $self->deparse($array, 24) . $arrow . |
1858 | $left . $self->deparse($idx, 1) . $right; |
6e90668e |
1859 | } |
9d2c6865 |
1860 | $idx = $self->deparse($idx, 1); |
6e90668e |
1861 | return "\$" . $array . $left . $idx . $right; |
1862 | } |
1863 | |
1864 | sub pp_aelem { maybe_local(@_, elem(@_, "[", "]", "pp_padav")) } |
1865 | sub pp_helem { maybe_local(@_, elem(@_, "{", "}", "pp_padhv")) } |
1866 | |
1867 | sub pp_gelem { |
1868 | my $self = shift; |
9d2c6865 |
1869 | my($op, $cx) = @_; |
6e90668e |
1870 | my($glob, $part) = ($op->first, $op->last); |
1871 | $glob = $glob->first; # skip rv2gv |
1872 | $glob = $glob->first if $glob->ppaddr eq "pp_rv2gv"; # this one's a bug |
9d2c6865 |
1873 | my $scope = is_scope($glob); |
1874 | $glob = $self->deparse($glob, 0); |
1875 | $part = $self->deparse($part, 1); |
6e90668e |
1876 | return "*" . ($scope ? "{$glob}" : $glob) . "{$part}"; |
1877 | } |
1878 | |
1879 | sub slice { |
1880 | my $self = shift; |
9d2c6865 |
1881 | my ($op, $cx, $left, $right, $regname, $padname) = @_; |
6e90668e |
1882 | my $last; |
1883 | my(@elems, $kid, $array, $list); |
1884 | if (class($op) eq "LISTOP") { |
1885 | $last = $op->last; |
1886 | } else { # ex-hslice inside delete() |
1887 | for ($kid = $op->first; !null $kid->sibling; $kid = $kid->sibling) {} |
1888 | $last = $kid; |
1889 | } |
1890 | $array = $last; |
1891 | $array = $array->first |
1892 | if $array->ppaddr eq $regname or $array->ppaddr eq "pp_null"; |
1893 | if (is_scope($array)) { |
9d2c6865 |
1894 | $array = "{" . $self->deparse($array, 0) . "}"; |
6e90668e |
1895 | } elsif ($array->ppaddr eq $padname) { |
1896 | $array = $self->padany($array); |
1897 | } else { |
9d2c6865 |
1898 | $array = $self->deparse($array, 24); |
6e90668e |
1899 | } |
1900 | $kid = $op->first->sibling; # skip pushmark |
1901 | if ($kid->ppaddr eq "pp_list") { |
1902 | $kid = $kid->first->sibling; # skip list, pushmark |
1903 | for (; !null $kid; $kid = $kid->sibling) { |
9d2c6865 |
1904 | push @elems, $self->deparse($kid, 6); |
6e90668e |
1905 | } |
1906 | $list = join(", ", @elems); |
1907 | } else { |
9d2c6865 |
1908 | $list = $self->deparse($kid, 1); |
6e90668e |
1909 | } |
1910 | return "\@" . $array . $left . $list . $right; |
1911 | } |
1912 | |
1913 | sub pp_aslice { maybe_local(@_, slice(@_, "[", "]", |
1914 | "pp_rv2av", "pp_padav")) } |
1915 | sub pp_hslice { maybe_local(@_, slice(@_, "{", "}", |
1916 | "pp_rv2hv", "pp_padhv")) } |
1917 | |
1918 | sub pp_lslice { |
1919 | my $self = shift; |
9d2c6865 |
1920 | my($op, $cx) = @_; |
6e90668e |
1921 | my $idx = $op->first; |
1922 | my $list = $op->last; |
1923 | my(@elems, $kid); |
9d2c6865 |
1924 | $list = $self->deparse($list, 1); |
1925 | $idx = $self->deparse($idx, 1); |
1926 | return "($list)" . "[$idx]"; |
6e90668e |
1927 | } |
1928 | |
1929 | sub OPpENTERSUB_AMPER () { 8 } |
1930 | |
1931 | sub OPf_WANT () { 3 } |
1932 | sub OPf_WANT_VOID () { 1 } |
1933 | sub OPf_WANT_SCALAR () { 2 } |
1934 | sub OPf_WANT_LIST () { 2 } |
1935 | |
1936 | sub want_scalar { |
1937 | my $op = shift; |
1938 | return ($op->flags & OPf_WANT) == OPf_WANT_SCALAR; |
1939 | } |
1940 | |
1941 | sub pp_entersub { |
1942 | my $self = shift; |
9d2c6865 |
1943 | my($op, $cx) = @_; |
6e90668e |
1944 | my $prefix = ""; |
1945 | my $amper = ""; |
1946 | my $proto = undef; |
9d2c6865 |
1947 | my $simple = 0; |
6e90668e |
1948 | my($kid, $args, @exprs); |
9d2c6865 |
1949 | if (not null $op->first->sibling) { # method |
6e90668e |
1950 | $kid = $op->first->sibling; # skip pushmark |
9d2c6865 |
1951 | my $obj = $self->deparse($kid, 24); |
6e90668e |
1952 | $kid = $kid->sibling; |
1953 | for (; not null $kid->sibling; $kid = $kid->sibling) { |
9d2c6865 |
1954 | push @exprs, $self->deparse($kid, 6); |
6e90668e |
1955 | } |
1956 | my $meth = $kid->first; |
1957 | if ($meth->ppaddr eq "pp_const") { |
1958 | $meth = $meth->sv->PV; # needs to be bare |
1959 | } else { |
9d2c6865 |
1960 | $meth = $self->deparse($meth, 1); |
6e90668e |
1961 | } |
6e90668e |
1962 | $args = join(", ", @exprs); |
1963 | $kid = $obj . "->" . $meth; |
9d2c6865 |
1964 | if ($args) { |
1965 | return $kid . "(" . $args . ")"; # parens mandatory |
6e90668e |
1966 | } else { |
9d2c6865 |
1967 | return $kid; # toke.c fakes parens |
6e90668e |
1968 | } |
9d2c6865 |
1969 | } |
1970 | # else, not a method |
1971 | if ($op->flags & OPf_SPECIAL) { |
1972 | $prefix = "do "; |
1973 | } elsif ($op->private & OPpENTERSUB_AMPER) { |
1974 | $amper = "&"; |
1975 | } |
1976 | $kid = $op->first; |
1977 | $kid = $kid->first->sibling; # skip ex-list, pushmark |
1978 | for (; not null $kid->sibling; $kid = $kid->sibling) { |
1979 | push @exprs, $kid; |
1980 | } |
1981 | if (is_scope($kid)) { |
1982 | $amper = "&"; |
1983 | $kid = "{" . $self->deparse($kid, 0) . "}"; |
1984 | } elsif ($kid->first->ppaddr eq "pp_gv") { |
1985 | my $gv = $kid->first->gv; |
1986 | if (class($gv->CV) ne "SPECIAL") { |
1987 | $proto = $gv->CV->PV if $gv->CV->FLAGS & SVf_POK; |
1988 | } |
1989 | $simple = 1; |
1990 | $kid = $self->deparse($kid, 24); |
1991 | } elsif (is_scalar $kid->first) { |
1992 | $amper = "&"; |
1993 | $kid = $self->deparse($kid, 24); |
1994 | } else { |
1995 | $prefix = ""; |
1996 | $kid = $self->deparse($kid, 24) . "->"; |
1997 | } |
1998 | if (defined $proto and not $amper) { |
1999 | my($arg, $real); |
2000 | my $doneok = 0; |
2001 | my @args = @exprs; |
2002 | my @reals; |
f5aa8f4e |
2003 | my $p = $proto; |
2004 | $p =~ s/([^\\]|^)([@%])(.*)$/$1$2/; |
2005 | while ($p) { |
2006 | $p =~ s/^ *([\\]?[\$\@&%*]|;)//; |
9d2c6865 |
2007 | my $chr = $1; |
2008 | if ($chr eq "") { |
2009 | undef $proto if @args; |
2010 | } elsif ($chr eq ";") { |
2011 | $doneok = 1; |
2012 | } elsif ($chr eq "@" or $chr eq "%") { |
2013 | push @reals, map($self->deparse($_, 6), @args); |
2014 | @args = (); |
2015 | } else { |
2016 | $arg = shift @args; |
f5aa8f4e |
2017 | last unless $arg; |
9d2c6865 |
2018 | if ($chr eq "\$") { |
2019 | if (want_scalar $arg) { |
2020 | push @reals, $self->deparse($arg, 6); |
2021 | } else { |
2022 | undef $proto; |
2023 | } |
2024 | } elsif ($chr eq "&") { |
2025 | if ($arg->ppaddr =~ /pp_(s?refgen|undef)/) { |
2026 | push @reals, $self->deparse($arg, 6); |
2027 | } else { |
2028 | undef $proto; |
2029 | } |
2030 | } elsif ($chr eq "*") { |
2031 | if ($arg->ppaddr =~ /^pp_s?refgen$/ |
2032 | and $arg->first->first->ppaddr eq "pp_rv2gv") |
2033 | { |
2034 | $real = $arg->first->first; # skip refgen, null |
2035 | if ($real->first->ppaddr eq "pp_gv") { |
2036 | push @reals, $self->deparse($real, 6); |
6e90668e |
2037 | } else { |
9d2c6865 |
2038 | push @reals, $self->deparse($real->first, 6); |
6e90668e |
2039 | } |
9d2c6865 |
2040 | } else { |
2041 | undef $proto; |
2042 | } |
2043 | } elsif (substr($chr, 0, 1) eq "\\") { |
2044 | $chr = substr($chr, 1); |
2045 | if ($arg->ppaddr =~ /^pp_s?refgen$/ and |
2046 | !null($real = $arg->first) and |
2047 | ($chr eq "\$" && is_scalar($real->first) |
2048 | or ($chr eq "\@" |
2049 | && $real->first->sibling->ppaddr |
2050 | =~ /^pp_(rv2|pad)av$/) |
2051 | or ($chr eq "%" |
2052 | && $real->first->sibling->ppaddr |
2053 | =~ /^pp_(rv2|pad)hv$/) |
2054 | #or ($chr eq "&" # This doesn't work |
2055 | # && $real->first->ppaddr eq "pp_rv2cv") |
2056 | or ($chr eq "*" |
2057 | && $real->first->ppaddr eq "pp_rv2gv"))) |
2058 | { |
2059 | push @reals, $self->deparse($real, 6); |
2060 | } else { |
2061 | undef $proto; |
6e90668e |
2062 | } |
2063 | } |
2064 | } |
6e90668e |
2065 | } |
f5aa8f4e |
2066 | undef $proto if $p and !$doneok; |
9d2c6865 |
2067 | undef $proto if @args; |
2068 | $args = join(", ", @reals); |
2069 | $amper = ""; |
2070 | unless (defined $proto) { |
2071 | $amper = "&"; |
2072 | $args = join(", ", map($self->deparse($_, 6), @exprs)); |
2073 | } |
2074 | } else { |
2075 | $args = join(", ", map($self->deparse($_, 6), @exprs)); |
6e90668e |
2076 | } |
9d2c6865 |
2077 | if ($prefix or $amper) { |
2078 | if ($op->flags & OPf_STACKED) { |
2079 | return $prefix . $amper . $kid . "(" . $args . ")"; |
2080 | } else { |
2081 | return $prefix . $amper. $kid; |
2082 | } |
6e90668e |
2083 | } else { |
9d2c6865 |
2084 | if (defined $proto and $proto eq "") { |
2085 | return $kid; |
2086 | } elsif ($proto eq "\$") { |
2087 | return $self->maybe_parens_func($kid, $args, $cx, 16); |
2088 | } elsif ($proto or $simple) { |
2089 | return $self->maybe_parens_func($kid, $args, $cx, 5); |
2090 | } else { |
2091 | return "$kid(" . $args . ")"; |
2092 | } |
6e90668e |
2093 | } |
2094 | } |
2095 | |
2096 | sub pp_enterwrite { unop(@_, "write") } |
2097 | |
2098 | # escape things that cause interpolation in double quotes, |
2099 | # but not character escapes |
2100 | sub uninterp { |
2101 | my($str) = @_; |
9d2c6865 |
2102 | $str =~ s/(^|[^\\])([\$\@]|\\[uUlLQE])/$1\\$2/g; |
2103 | return $str; |
2104 | } |
2105 | |
2106 | # the same, but treat $|, $), and $ at the end of the string differently |
2107 | sub re_uninterp { |
2108 | my($str) = @_; |
2109 | $str =~ s/(^|[^\\])(\@|\\[uUlLQE])/$1\\$2/g; |
2110 | $str =~ s/(^|[^\\])(\$[^)|])/$1\\$2/g; |
6e90668e |
2111 | return $str; |
2112 | } |
2113 | |
2114 | # character escapes, but not delimiters that might need to be escaped |
2115 | sub escape_str { # ASCII |
2116 | my($str) = @_; |
6e90668e |
2117 | $str =~ s/\a/\\a/g; |
2118 | # $str =~ s/\cH/\\b/g; # \b means someting different in a regex |
2119 | $str =~ s/\t/\\t/g; |
2120 | $str =~ s/\n/\\n/g; |
2121 | $str =~ s/\e/\\e/g; |
2122 | $str =~ s/\f/\\f/g; |
2123 | $str =~ s/\r/\\r/g; |
2124 | $str =~ s/([\cA-\cZ])/'\\c' . chr(ord('@') + ord($1))/ge; |
2125 | $str =~ s/([\0\033-\037\177-\377])/'\\' . sprintf("%03o", ord($1))/ge; |
2126 | return $str; |
2127 | } |
2128 | |
9d2c6865 |
2129 | # Don't do this for regexen |
2130 | sub unback { |
2131 | my($str) = @_; |
2132 | $str =~ s/\\/\\\\/g; |
2133 | return $str; |
2134 | } |
2135 | |
6e90668e |
2136 | sub balanced_delim { |
2137 | my($str) = @_; |
2138 | my @str = split //, $str; |
2139 | my($ar, $open, $close, $fail, $c, $cnt); |
2140 | for $ar (['[',']'], ['(',')'], ['<','>'], ['{','}']) { |
2141 | ($open, $close) = @$ar; |
2142 | $fail = 0; $cnt = 0; |
2143 | for $c (@str) { |
2144 | if ($c eq $open) { |
2145 | $cnt++; |
2146 | } elsif ($c eq $close) { |
2147 | $cnt--; |
2148 | if ($cnt < 0) { |
2149 | $fail = 1; |
2150 | last; |
2151 | } |
2152 | } |
2153 | } |
2154 | $fail = 1 if $cnt != 0; |
2155 | return ($open, "$open$str$close") if not $fail; |
2156 | } |
2157 | return ("", $str); |
2158 | } |
2159 | |
2160 | sub single_delim { |
2161 | my($q, $default, $str) = @_; |
90be192f |
2162 | return "$default$str$default" if $default and index($str, $default) == -1; |
6e90668e |
2163 | my($succeed, $delim); |
2164 | ($succeed, $str) = balanced_delim($str); |
2165 | return "$q$str" if $succeed; |
2166 | for $delim ('/', '"', '#') { |
2167 | return "$q$delim" . $str . $delim if index($str, $delim) == -1; |
2168 | } |
90be192f |
2169 | if ($default) { |
2170 | $str =~ s/$default/\\$default/g; |
2171 | return "$default$str$default"; |
2172 | } else { |
2173 | $str =~ s[/][\\/]g; |
2174 | return "$q/$str/"; |
2175 | } |
6e90668e |
2176 | } |
2177 | |
2178 | sub SVf_IOK () {0x10000} |
2179 | sub SVf_NOK () {0x20000} |
2180 | sub SVf_ROK () {0x80000} |
2181 | |
2182 | sub const { |
2183 | my $sv = shift; |
2184 | if (class($sv) eq "SPECIAL") { |
9d2c6865 |
2185 | return ('undef', '1', '0')[$$sv-1]; |
6e90668e |
2186 | } elsif ($sv->FLAGS & SVf_IOK) { |
a798dbf2 |
2187 | return $sv->IV; |
6e90668e |
2188 | } elsif ($sv->FLAGS & SVf_NOK) { |
a798dbf2 |
2189 | return $sv->NV; |
6e90668e |
2190 | } elsif ($sv->FLAGS & SVf_ROK) { |
2191 | return "\\(" . const($sv->RV) . ")"; # constant folded |
a798dbf2 |
2192 | } else { |
6e90668e |
2193 | my $str = $sv->PV; |
2194 | if ($str =~ /[^ -~]/) { # ASCII |
9d2c6865 |
2195 | return single_delim("qq", '"', uninterp escape_str unback $str); |
6e90668e |
2196 | } else { |
2197 | $str =~ s/\\/\\\\/g; |
2198 | return single_delim("q", "'", $str); |
2199 | } |
a798dbf2 |
2200 | } |
2201 | } |
2202 | |
6e90668e |
2203 | sub pp_const { |
2204 | my $self = shift; |
9d2c6865 |
2205 | my($op, $cx) = @_; |
6e90668e |
2206 | # if ($op->private & OPp_CONST_BARE) { # trouble with `=>' autoquoting |
2207 | # return $op->sv->PV; |
2208 | # } |
2209 | return const($op->sv); |
2210 | } |
2211 | |
2212 | sub dq { |
2213 | my $self = shift; |
2214 | my $op = shift; |
2215 | my $type = $op->ppaddr; |
2216 | if ($type eq "pp_const") { |
9d2c6865 |
2217 | return uninterp(escape_str(unback($op->sv->PV))); |
6e90668e |
2218 | } elsif ($type eq "pp_concat") { |
2219 | return $self->dq($op->first) . $self->dq($op->last); |
2220 | } elsif ($type eq "pp_uc") { |
2221 | return '\U' . $self->dq($op->first->sibling) . '\E'; |
2222 | } elsif ($type eq "pp_lc") { |
2223 | return '\L' . $self->dq($op->first->sibling) . '\E'; |
2224 | } elsif ($type eq "pp_ucfirst") { |
2225 | return '\u' . $self->dq($op->first->sibling); |
2226 | } elsif ($type eq "pp_lcfirst") { |
2227 | return '\l' . $self->dq($op->first->sibling); |
2228 | } elsif ($type eq "pp_quotemeta") { |
2229 | return '\Q' . $self->dq($op->first->sibling) . '\E'; |
2230 | } elsif ($type eq "pp_join") { |
9d2c6865 |
2231 | return $self->deparse($op->last, 26); # was join($", @ary) |
a798dbf2 |
2232 | } else { |
9d2c6865 |
2233 | return $self->deparse($op, 26); |
6e90668e |
2234 | } |
2235 | } |
2236 | |
2237 | sub pp_backtick { |
2238 | my $self = shift; |
9d2c6865 |
2239 | my($op, $cx) = @_; |
6e90668e |
2240 | # skip pushmark |
2241 | return single_delim("qx", '`', $self->dq($op->first->sibling)); |
2242 | } |
2243 | |
2244 | sub dquote { |
2245 | my $self = shift; |
2246 | my $op = shift; |
2247 | # skip ex-stringify, pushmark |
2248 | return single_delim("qq", '"', $self->dq($op->first->sibling)); |
2249 | } |
2250 | |
2251 | # OP_STRINGIFY is a listop, but it only ever has one arg (?) |
2252 | sub pp_stringify { dquote(@_) } |
2253 | |
2254 | # tr/// and s/// (and tr[][], tr[]//, tr###, etc) |
2255 | # note that tr(from)/to/ is OK, but not tr/from/(to) |
2256 | sub double_delim { |
2257 | my($from, $to) = @_; |
2258 | my($succeed, $delim); |
2259 | if ($from !~ m[/] and $to !~ m[/]) { |
2260 | return "/$from/$to/"; |
2261 | } elsif (($succeed, $from) = balanced_delim($from) and $succeed) { |
2262 | if (($succeed, $to) = balanced_delim($to) and $succeed) { |
2263 | return "$from$to"; |
2264 | } else { |
2265 | for $delim ('/', '"', '#') { # note no `'' -- s''' is special |
2266 | return "$from$delim$to$delim" if index($to, $delim) == -1; |
2267 | } |
2268 | $to =~ s[/][\\/]g; |
2269 | return "$from/$to/"; |
2270 | } |
2271 | } else { |
2272 | for $delim ('/', '"', '#') { # note no ' |
2273 | return "$delim$from$delim$to$delim" |
2274 | if index($to . $from, $delim) == -1; |
2275 | } |
2276 | $from =~ s[/][\\/]g; |
2277 | $to =~ s[/][\\/]g; |
2278 | return "/$from/$to/"; |
2279 | } |
2280 | } |
2281 | |
2282 | sub pchr { # ASCII |
2283 | my($n) = @_; |
2284 | if ($n == ord '\\') { |
2285 | return '\\\\'; |
2286 | } elsif ($n >= ord(' ') and $n <= ord('~')) { |
2287 | return chr($n); |
2288 | } elsif ($n == ord "\a") { |
2289 | return '\\a'; |
2290 | } elsif ($n == ord "\b") { |
2291 | return '\\b'; |
2292 | } elsif ($n == ord "\t") { |
2293 | return '\\t'; |
2294 | } elsif ($n == ord "\n") { |
2295 | return '\\n'; |
2296 | } elsif ($n == ord "\e") { |
2297 | return '\\e'; |
2298 | } elsif ($n == ord "\f") { |
2299 | return '\\f'; |
2300 | } elsif ($n == ord "\r") { |
2301 | return '\\r'; |
2302 | } elsif ($n >= ord("\cA") and $n <= ord("\cZ")) { |
2303 | return '\\c' . chr(ord("@") + $n); |
2304 | } else { |
2305 | # return '\x' . sprintf("%02x", $n); |
2306 | return '\\' . sprintf("%03o", $n); |
2307 | } |
2308 | } |
2309 | |
2310 | sub collapse { |
2311 | my(@chars) = @_; |
2312 | my($c, $str, $tr); |
2313 | for ($c = 0; $c < @chars; $c++) { |
2314 | $tr = $chars[$c]; |
2315 | $str .= pchr($tr); |
2316 | if ($c <= $#chars - 2 and $chars[$c + 1] == $tr + 1 and |
2317 | $chars[$c + 2] == $tr + 2) |
2318 | { |
2319 | for (; $c <= $#chars and $chars[$c + 1] == $chars[$c] + 1; $c++) {} |
2320 | $str .= "-"; |
2321 | $str .= pchr($chars[$c]); |
2322 | } |
2323 | } |
2324 | return $str; |
2325 | } |
2326 | |
2327 | sub OPpTRANS_SQUASH () { 16 } |
2328 | sub OPpTRANS_DELETE () { 32 } |
2329 | sub OPpTRANS_COMPLEMENT () { 64 } |
2330 | |
2331 | sub pp_trans { |
2332 | my $self = shift; |
9d2c6865 |
2333 | my($op, $cx) = @_; |
6e90668e |
2334 | my(@table) = unpack("s256", $op->pv); |
2335 | my($c, $tr, @from, @to, @delfrom, $delhyphen); |
2336 | if ($table[ord "-"] != -1 and |
2337 | $table[ord("-") - 1] == -1 || $table[ord("-") + 1] == -1) |
2338 | { |
2339 | $tr = $table[ord "-"]; |
2340 | $table[ord "-"] = -1; |
2341 | if ($tr >= 0) { |
2342 | @from = ord("-"); |
2343 | @to = $tr; |
2344 | } else { # -2 ==> delete |
2345 | $delhyphen = 1; |
2346 | } |
2347 | } |
2348 | for ($c = 0; $c < 256; $c++) { |
2349 | $tr = $table[$c]; |
2350 | if ($tr >= 0) { |
2351 | push @from, $c; push @to, $tr; |
2352 | } elsif ($tr == -2) { |
2353 | push @delfrom, $c; |
2354 | } |
2355 | } |
2356 | my $flags; |
2357 | @from = (@from, @delfrom); |
2358 | if ($op->private & OPpTRANS_COMPLEMENT) { |
2359 | $flags .= "c"; |
2360 | my @newfrom = (); |
2361 | my %from; |
2362 | @from{@from} = (1) x @from; |
2363 | for ($c = 0; $c < 256; $c++) { |
2364 | push @newfrom, $c unless $from{$c}; |
2365 | } |
2366 | @from = @newfrom; |
2367 | } |
2368 | if ($op->private & OPpTRANS_DELETE) { |
2369 | $flags .= "d"; |
2370 | } else { |
2371 | pop @to while $#to and $to[$#to] == $to[$#to -1]; |
2372 | } |
2373 | $flags .= "s" if $op->private & OPpTRANS_SQUASH; |
2374 | my($from, $to); |
2375 | $from = collapse(@from); |
2376 | $to = collapse(@to); |
2377 | $from .= "-" if $delhyphen; |
2378 | return "tr" . double_delim($from, $to) . $flags; |
2379 | } |
2380 | |
2381 | # Like dq(), but different |
2382 | sub re_dq { |
2383 | my $self = shift; |
2384 | my $op = shift; |
2385 | my $type = $op->ppaddr; |
2386 | if ($type eq "pp_const") { |
2387 | return uninterp($op->sv->PV); |
2388 | } elsif ($type eq "pp_concat") { |
2389 | return $self->re_dq($op->first) . $self->re_dq($op->last); |
2390 | } elsif ($type eq "pp_uc") { |
2391 | return '\U' . $self->re_dq($op->first->sibling) . '\E'; |
2392 | } elsif ($type eq "pp_lc") { |
2393 | return '\L' . $self->re_dq($op->first->sibling) . '\E'; |
2394 | } elsif ($type eq "pp_ucfirst") { |
2395 | return '\u' . $self->re_dq($op->first->sibling); |
2396 | } elsif ($type eq "pp_lcfirst") { |
2397 | return '\l' . $self->re_dq($op->first->sibling); |
2398 | } elsif ($type eq "pp_quotemeta") { |
2399 | return '\Q' . $self->re_dq($op->first->sibling) . '\E'; |
2400 | } elsif ($type eq "pp_join") { |
9d2c6865 |
2401 | return $self->deparse($op->last, 26); # was join($", @ary) |
6e90668e |
2402 | } else { |
9d2c6865 |
2403 | return $self->deparse($op, 26); |
6e90668e |
2404 | } |
2405 | } |
2406 | |
2407 | sub pp_regcomp { |
2408 | my $self = shift; |
9d2c6865 |
2409 | my($op, $cx) = @_; |
6e90668e |
2410 | my $kid = $op->first; |
2411 | $kid = $kid->first if $kid->ppaddr eq "pp_regcmaybe"; |
90be192f |
2412 | $kid = $kid->first if $kid->ppaddr eq "pp_regcreset"; |
6e90668e |
2413 | return $self->re_dq($kid); |
2414 | } |
2415 | |
2416 | sub OPp_RUNTIME () { 64 } |
2417 | |
2418 | sub PMf_ONCE () { 0x2 } |
2419 | sub PMf_SKIPWHITE () { 0x10 } |
6e90668e |
2420 | sub PMf_CONST () { 0x40 } |
2421 | sub PMf_KEEP () { 0x80 } |
2422 | sub PMf_GLOBAL () { 0x100 } |
2423 | sub PMf_CONTINUE () { 0x200 } |
2424 | sub PMf_EVAL () { 0x400 } |
90be192f |
2425 | sub PMf_LOCALE () { 0x800 } |
6e90668e |
2426 | sub PMf_MULTILINE () { 0x1000 } |
2427 | sub PMf_SINGLELINE () { 0x2000 } |
90be192f |
2428 | sub PMf_FOLD () { 0x4000 } |
6e90668e |
2429 | sub PMf_EXTENDED () { 0x8000 } |
2430 | |
2431 | # osmic acid -- see osmium tetroxide |
2432 | |
2433 | my %matchwords; |
2434 | map($matchwords{join "", sort split //, $_} = $_, 'cig', 'cog', 'cos', 'cogs', |
2435 | 'cox', 'go', 'is', 'ism', 'iso', 'mig', 'mix', 'osmic', 'ox', 'sic', |
2436 | 'sig', 'six', 'smog', 'so', 'soc', 'sog', 'xi'); |
2437 | |
90be192f |
2438 | sub matchop { |
6e90668e |
2439 | my $self = shift; |
90be192f |
2440 | my($op, $cx, $name, $delim) = @_; |
6e90668e |
2441 | my $kid = $op->first; |
9d2c6865 |
2442 | my ($binop, $var, $re) = ("", "", ""); |
6e90668e |
2443 | if ($op->flags & OPf_STACKED) { |
9d2c6865 |
2444 | $binop = 1; |
2445 | $var = $self->deparse($kid, 20); |
6e90668e |
2446 | $kid = $kid->sibling; |
2447 | } |
2448 | if (null $kid) { |
9d2c6865 |
2449 | $re = re_uninterp(escape_str($op->precomp)); |
6e90668e |
2450 | } else { |
9d2c6865 |
2451 | $re = $self->deparse($kid, 1); |
6e90668e |
2452 | } |
2453 | my $flags = ""; |
2454 | $flags .= "c" if $op->pmflags & PMf_CONTINUE; |
2455 | $flags .= "g" if $op->pmflags & PMf_GLOBAL; |
2456 | $flags .= "i" if $op->pmflags & PMf_FOLD; |
2457 | $flags .= "m" if $op->pmflags & PMf_MULTILINE; |
2458 | $flags .= "o" if $op->pmflags & PMf_KEEP; |
2459 | $flags .= "s" if $op->pmflags & PMf_SINGLELINE; |
2460 | $flags .= "x" if $op->pmflags & PMf_EXTENDED; |
2461 | $flags = $matchwords{$flags} if $matchwords{$flags}; |
2462 | if ($op->pmflags & PMf_ONCE) { # only one kind of delimiter works here |
2463 | $re =~ s/\?/\\?/g; |
9d2c6865 |
2464 | $re = "?$re?"; |
2465 | } else { |
90be192f |
2466 | $re = single_delim($name, $delim, $re); |
9d2c6865 |
2467 | } |
2468 | $re = $re . $flags; |
2469 | if ($binop) { |
2470 | return $self->maybe_parens("$var =~ $re", $cx, 20); |
2471 | } else { |
2472 | return $re; |
6e90668e |
2473 | } |
6e90668e |
2474 | } |
2475 | |
90be192f |
2476 | sub pp_match { matchop(@_, "m", "/") } |
2477 | sub pp_pushre { matchop(@_, "m", "/") } |
2478 | sub pp_qr { matchop(@_, "qr", "") } |
6e90668e |
2479 | |
2480 | sub pp_split { |
2481 | my $self = shift; |
9d2c6865 |
2482 | my($op, $cx) = @_; |
6e90668e |
2483 | my($kid, @exprs, $ary, $expr); |
2484 | $kid = $op->first; |
2485 | if ($ {$kid->pmreplroot}) { |
2486 | $ary = '@' . $self->gv_name($kid->pmreplroot); |
2487 | } |
2488 | for (; !null($kid); $kid = $kid->sibling) { |
9d2c6865 |
2489 | push @exprs, $self->deparse($kid, 6); |
6e90668e |
2490 | } |
2491 | $expr = "split(" . join(", ", @exprs) . ")"; |
2492 | if ($ary) { |
9d2c6865 |
2493 | return $self->maybe_parens("$ary = $expr", $cx, 7); |
6e90668e |
2494 | } else { |
2495 | return $expr; |
2496 | } |
2497 | } |
2498 | |
2499 | # oxime -- any of various compounds obtained chiefly by the action of |
2500 | # hydroxylamine on aldehydes and ketones and characterized by the |
2501 | # bivalent grouping C=NOH [Webster's Tenth] |
2502 | |
2503 | my %substwords; |
2504 | map($substwords{join "", sort split //, $_} = $_, 'ego', 'egoism', 'em', |
2505 | 'es', 'ex', 'exes', 'gee', 'go', 'goes', 'ie', 'ism', 'iso', 'me', |
2506 | 'meese', 'meso', 'mig', 'mix', 'os', 'ox', 'oxime', 'see', 'seem', |
2507 | 'seg', 'sex', 'sig', 'six', 'smog', 'sog', 'some', 'xi'); |
2508 | |
2509 | sub pp_subst { |
2510 | my $self = shift; |
9d2c6865 |
2511 | my($op, $cx) = @_; |
6e90668e |
2512 | my $kid = $op->first; |
9d2c6865 |
2513 | my($binop, $var, $re, $repl) = ("", "", "", ""); |
6e90668e |
2514 | if ($op->flags & OPf_STACKED) { |
9d2c6865 |
2515 | $binop = 1; |
2516 | $var = $self->deparse($kid, 20); |
6e90668e |
2517 | $kid = $kid->sibling; |
2518 | } |
2519 | my $flags = ""; |
2520 | if (null($op->pmreplroot)) { |
2521 | $repl = $self->dq($kid); |
2522 | $kid = $kid->sibling; |
2523 | } else { |
2524 | $repl = $op->pmreplroot->first; # skip substcont |
2525 | while ($repl->ppaddr eq "pp_entereval") { |
2526 | $repl = $repl->first; |
2527 | $flags .= "e"; |
2528 | } |
9d2c6865 |
2529 | $repl = $self->dq($repl); |
6e90668e |
2530 | } |
2531 | if (null $kid) { |
9d2c6865 |
2532 | $re = re_uninterp(escape_str($op->precomp)); |
6e90668e |
2533 | } else { |
9d2c6865 |
2534 | $re = $self->deparse($kid, 1); |
a798dbf2 |
2535 | } |
6e90668e |
2536 | $flags .= "e" if $op->pmflags & PMf_EVAL; |
2537 | $flags .= "g" if $op->pmflags & PMf_GLOBAL; |
2538 | $flags .= "i" if $op->pmflags & PMf_FOLD; |
2539 | $flags .= "m" if $op->pmflags & PMf_MULTILINE; |
2540 | $flags .= "o" if $op->pmflags & PMf_KEEP; |
2541 | $flags .= "s" if $op->pmflags & PMf_SINGLELINE; |
2542 | $flags .= "x" if $op->pmflags & PMf_EXTENDED; |
2543 | $flags = $substwords{$flags} if $substwords{$flags}; |
9d2c6865 |
2544 | if ($binop) { |
2545 | return $self->maybe_parens("$var =~ s" |
2546 | . double_delim($re, $repl) . $flags, |
2547 | $cx, 20); |
2548 | } else { |
2549 | return "s". double_delim($re, $repl) . $flags; |
2550 | } |
a798dbf2 |
2551 | } |
2552 | |
2553 | 1; |
f6f9bdb7 |
2554 | __END__ |
2555 | |
2556 | =head1 NAME |
2557 | |
2558 | B::Deparse - Perl compiler backend to produce perl code |
2559 | |
2560 | =head1 SYNOPSIS |
2561 | |
f5aa8f4e |
2562 | B<perl> B<-MO=Deparse>[B<,-u>I<PACKAGE>][B<,-p>][B<,-l>][B<,-s>I<LETTERS>] I<prog.pl> |
f6f9bdb7 |
2563 | |
2564 | =head1 DESCRIPTION |
2565 | |
2566 | B::Deparse is a backend module for the Perl compiler that generates |
2567 | perl source code, based on the internal compiled structure that perl |
2568 | itself creates after parsing a program. The output of B::Deparse won't |
2569 | be exactly the same as the original source, since perl doesn't keep |
2570 | track of comments or whitespace, and there isn't a one-to-one |
2571 | correspondence between perl's syntactical constructions and their |
9d2c6865 |
2572 | compiled form, but it will often be close. When you use the B<-p> |
2573 | option, the output also includes parentheses even when they are not |
2574 | required by precedence, which can make it easy to see if perl is |
2575 | parsing your expressions the way you intended. |
f6f9bdb7 |
2576 | |
2577 | Please note that this module is mainly new and untested code and is |
2578 | still under development, so it may change in the future. |
2579 | |
2580 | =head1 OPTIONS |
2581 | |
9d2c6865 |
2582 | As with all compiler backend options, these must follow directly after |
2583 | the '-MO=Deparse', separated by a comma but not any white space. |
f6f9bdb7 |
2584 | |
2585 | =over 4 |
2586 | |
9d2c6865 |
2587 | =item B<-p> |
2588 | |
2589 | Print extra parentheses. Without this option, B::Deparse includes |
2590 | parentheses in its output only when they are needed, based on the |
2591 | structure of your program. With B<-p>, it uses parentheses (almost) |
2592 | whenever they would be legal. This can be useful if you are used to |
2593 | LISP, or if you want to see how perl parses your input. If you say |
2594 | |
2595 | if ($var & 0x7f == 65) {print "Gimme an A!"} |
2596 | print ($which ? $a : $b), "\n"; |
2597 | $name = $ENV{USER} or "Bob"; |
2598 | |
2599 | C<B::Deparse,-p> will print |
2600 | |
2601 | if (($var & 0)) { |
2602 | print('Gimme an A!') |
2603 | }; |
2604 | (print(($which ? $a : $b)), '???'); |
2605 | (($name = $ENV{'USER'}) or '???') |
2606 | |
2607 | which probably isn't what you intended (the C<'???'> is a sign that |
2608 | perl optimized away a constant value). |
2609 | |
2610 | =item B<-u>I<PACKAGE> |
f6f9bdb7 |
2611 | |
2612 | Normally, B::Deparse deparses the main code of a program, all the subs |
2613 | called by the main program (and all the subs called by them, |
2614 | recursively), and any other subs in the main:: package. To include |
2615 | subs in other packages that aren't called directly, such as AUTOLOAD, |
2616 | DESTROY, other subs called automatically by perl, and methods, which |
2617 | aren't resolved to subs until runtime, use the B<-u> option. The |
2618 | argument to B<-u> is the name of a package, and should follow directly |
2619 | after the 'u'. Multiple B<-u> options may be given, separated by |
2620 | commas. Note that unlike some other backends, B::Deparse doesn't |
2621 | (yet) try to guess automatically when B<-u> is needed -- you must |
2622 | invoke it yourself. |
2623 | |
f5aa8f4e |
2624 | =item B<-l> |
2625 | |
2626 | Add '#line' declarations to the output based on the line and file |
2627 | locations of the original code. |
2628 | |
9d2c6865 |
2629 | =item B<-s>I<LETTERS> |
2630 | |
2631 | Tweak the style of B::Deparse's output. At the moment, only one style |
2632 | option is implemented: |
2633 | |
2634 | =over 4 |
2635 | |
2636 | =item B<C> |
2637 | |
2638 | Cuddle C<elsif>, C<else>, and C<continue> blocks. For example, print |
2639 | |
2640 | if (...) { |
2641 | ... |
2642 | } else { |
2643 | ... |
2644 | } |
2645 | |
2646 | instead of |
2647 | |
2648 | if (...) { |
2649 | ... |
2650 | } |
2651 | else { |
2652 | ... |
2653 | } |
2654 | |
2655 | The default is not to cuddle. |
2656 | |
2657 | =back |
2658 | |
f6f9bdb7 |
2659 | =back |
2660 | |
2661 | =head1 BUGS |
2662 | |
2663 | See the 'to do' list at the beginning of the module file. |
2664 | |
2665 | =head1 AUTHOR |
2666 | |
2667 | Stephen McCamant <alias@mcs.com>, based on an earlier version by |
2668 | Malcolm Beattie <mbeattie@sable.ox.ac.uk>. |
2669 | |
2670 | =cut |