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minor qr// fix
[perl5.git] / ext / B / B / Deparse.pm
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6e90668e 1# B::Deparse.pm
6f611a1a 2# Copyright (c) 1998, 1999, 2000 Stephen McCamant. All rights reserved.
6e90668e
SM
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 9package B::Deparse;
f4a44678 10use Carp 'cluck', 'croak';
7a9b44b9 11use B qw(class main_root main_start main_cv svref_2object opnumber cstring
bd0865ec 12 OPf_WANT OPf_WANT_VOID OPf_WANT_SCALAR OPf_WANT_LIST
90c0eb26 13 OPf_KIDS OPf_REF OPf_STACKED OPf_SPECIAL OPf_MOD
ce4e655d 14 OPpLVAL_INTRO OPpOUR_INTRO OPpENTERSUB_AMPER OPpSLICE OPpCONST_BARE
3ed82cfc 15 OPpTRANS_SQUASH OPpTRANS_DELETE OPpTRANS_COMPLEMENT OPpTARGET_MY
7e80da18
RH
16 OPpCONST_ARYBASE OPpEXISTS_SUB OPpSORT_NUMERIC OPpSORT_INTEGER
17 OPpSORT_REVERSE
ce4e655d 18 SVf_IOK SVf_NOK SVf_ROK SVf_POK SVpad_OUR
6aaf4108 19 CVf_METHOD CVf_LOCKED CVf_LVALUE
fcd95d64 20 PMf_KEEP PMf_GLOBAL PMf_CONTINUE PMf_EVAL PMf_ONCE PMf_SKIPWHITE
bd0865ec 21 PMf_MULTILINE PMf_SINGLELINE PMf_FOLD PMf_EXTENDED);
d2bc402e 22$VERSION = 0.62;
a798dbf2 23use strict;
34a48b4b 24use warnings ();
a798dbf2 25
6e90668e
SM
26# Changes between 0.50 and 0.51:
27# - fixed nulled leave with live enter in sort { }
28# - fixed reference constants (\"str")
29# - handle empty programs gracefully
30# - handle infinte loops (for (;;) {}, while (1) {})
31# - differentiate between `for my $x ...' and `my $x; for $x ...'
32# - various minor cleanups
33# - moved globals into an object
34# - added `-u', like B::C
35# - package declarations using cop_stash
36# - subs, formats and code sorted by cop_seq
f6f9bdb7 37# Changes between 0.51 and 0.52:
4d1ff10f 38# - added pp_threadsv (special variables under USE_5005THREADS)
f6f9bdb7 39# - added documentation
bd0865ec 40# Changes between 0.52 and 0.53:
9d2c6865
SM
41# - many changes adding precedence contexts and associativity
42# - added `-p' and `-s' output style options
43# - various other minor fixes
bd0865ec 44# Changes between 0.53 and 0.54:
d7f5b6da
SM
45# - added support for new `for (1..100)' optimization,
46# thanks to Gisle Aas
bd0865ec 47# Changes between 0.54 and 0.55:
90be192f
SM
48# - added support for new qr// construct
49# - added support for new pp_regcreset OP
bd0865ec 50# Changes between 0.55 and 0.56:
f5aa8f4e
SM
51# - tested on base/*.t, cmd/*.t, comp/*.t, io/*.t
52# - fixed $# on non-lexicals broken in last big rewrite
53# - added temporary fix for change in opcode of OP_STRINGIFY
54# - fixed problem in 0.54's for() patch in `for (@ary)'
55# - fixed precedence in conditional of ?:
56# - tweaked list paren elimination in `my($x) = @_'
57# - made continue-block detection trickier wrt. null ops
58# - fixed various prototype problems in pp_entersub
59# - added support for sub prototypes that never get GVs
60# - added unquoting for special filehandle first arg in truncate
61# - print doubled rv2gv (a bug) as `*{*GV}' instead of illegal `**GV'
62# - added semicolons at the ends of blocks
63# - added -l `#line' declaration option -- fixes cmd/subval.t 27,28
bd0865ec
GS
64# Changes between 0.56 and 0.561:
65# - fixed multiply-declared my var in pp_truncate (thanks to Sarathy)
66# - used new B.pm symbolic constants (done by Nick Ing-Simmons)
67# Changes between 0.561 and 0.57:
68# - stylistic changes to symbolic constant stuff
69# - handled scope in s///e replacement code
70# - added unquote option for expanding "" into concats, etc.
71# - split method and proto parts of pp_entersub into separate functions
72# - various minor cleanups
f4a44678
SM
73# Changes after 0.57:
74# - added parens in \&foo (patch by Albert Dvornik)
75# Changes between 0.57 and 0.58:
76# - fixed `0' statements that weren't being printed
77# - added methods for use from other programs
78# (based on patches from James Duncan and Hugo van der Sanden)
79# - added -si and -sT to control indenting (also based on a patch from Hugo)
80# - added -sv to print something else instead of '???'
81# - preliminary version of utf8 tr/// handling
3ed82cfc
GS
82# Changes after 0.58:
83# - uses of $op->ppaddr changed to new $op->name (done by Sarathy)
84# - added support for Hugo's new OP_SETSTATE (like nextstate)
85# Changes between 0.58 and 0.59
86# - added support for Chip's OP_METHOD_NAMED
87# - added support for Ilya's OPpTARGET_MY optimization
88# - elided arrows before `()' subscripts when possible
58cccf98
SM
89# Changes between 0.59 and 0.60
90# - support for method attribues was added
91# - some warnings fixed
92# - separate recognition of constant subs
93# - rewrote continue block handling, now recoginizing for loops
94# - added more control of expanding control structures
c7f67cde
RH
95# Changes between 0.60 and 0.61 (mostly by Robin Houston)
96# - many bug-fixes
97# - support for pragmas and 'use'
98# - support for the little-used $[ variable
99# - support for __DATA__ sections
100# - UTF8 support
101# - BEGIN, CHECK, INIT and END blocks
102# - scoping of subroutine declarations fixed
103# - compile-time output from the input program can be suppressed, so that the
104# output is just the deparsed code. (a change to O.pm in fact)
105# - our() declarations
106# - *all* the known bugs are now listed in the BUGS section
107# - comprehensive test mechanism (TEST -deparse)
6e90668e
SM
108
109# Todo:
2a9e2f8a
RH
110# (See also BUGS section at the end of this file)
111#
f4a44678
SM
112# - finish tr/// changes
113# - add option for even more parens (generalize \&foo change)
90be192f 114# - left/right context
f4a44678 115# - treat top-level block specially for incremental output
58cccf98 116# - copy comments (look at real text with $^P?)
f5aa8f4e 117# - avoid semis in one-statement blocks
9d2c6865 118# - associativity of &&=, ||=, ?:
6e90668e
SM
119# - ',' => '=>' (auto-unquote?)
120# - break long lines ("\r" as discretionary break?)
f4a44678
SM
121# - configurable syntax highlighting: ANSI color, HTML, TeX, etc.
122# - more style options: brace style, hex vs. octal, quotes, ...
123# - print big ints as hex/octal instead of decimal (heuristic?)
3ed82cfc 124# - handle `my $x if 0'?
f5aa8f4e 125# - coordinate with Data::Dumper (both directions? see previous)
6e90668e
SM
126# - version using op_next instead of op_first/sibling?
127# - avoid string copies (pass arrays, one big join?)
9d2c6865 128# - here-docs?
6e90668e 129
f5aa8f4e 130# Tests that will always fail:
2a9e2f8a 131# (see t/TEST for the short list)
f5aa8f4e 132
6e90668e
SM
133# Object fields (were globals):
134#
135# avoid_local:
136# (local($a), local($b)) and local($a, $b) have the same internal
137# representation but the short form looks better. We notice we can
138# use a large-scale local when checking the list, but need to prevent
139# individual locals too. This hash holds the addresses of OPs that
140# have already had their local-ness accounted for. The same thing
141# is done with my().
142#
143# curcv:
144# CV for current sub (or main program) being deparsed
145#
8510e997
RH
146# curcvlex:
147# Cached hash of lexical variables for curcv: keys are names,
148# each value is an array of pairs, indicating the cop_seq of scopes
149# in which a var of that name is valid.
150#
34a48b4b
RH
151# curcop:
152# COP for statement being deparsed
153#
6e90668e
SM
154# curstash:
155# name of the current package for deparsed code
156#
157# subs_todo:
34a48b4b 158# array of [cop_seq, CV, is_format?] for subs and formats we still
6e90668e
SM
159# want to deparse
160#
f5aa8f4e
SM
161# protos_todo:
162# as above, but [name, prototype] for subs that never got a GV
163#
6e90668e
SM
164# subs_done, forms_done:
165# keys are addresses of GVs for subs and formats we've already
166# deparsed (or at least put into subs_todo)
9d2c6865 167#
0ca62a8e
RH
168# subs_declared
169# keys are names of subs for which we've printed declarations.
170# That means we can omit parentheses from the arguments.
171#
9d2c6865 172# parens: -p
f5aa8f4e 173# linenums: -l
bd0865ec 174# unquote: -q
9d2c6865 175# cuddle: ` ' or `\n', depending on -sC
f4a44678
SM
176# indent_size: -si
177# use_tabs: -sT
178# ex_const: -sv
9d2c6865
SM
179
180# A little explanation of how precedence contexts and associativity
181# work:
182#
183# deparse() calls each per-op subroutine with an argument $cx (short
184# for context, but not the same as the cx* in the perl core), which is
185# a number describing the op's parents in terms of precedence, whether
f5aa8f4e 186# they're inside an expression or at statement level, etc. (see
9d2c6865
SM
187# chart below). When ops with children call deparse on them, they pass
188# along their precedence. Fractional values are used to implement
189# associativity (`($x + $y) + $z' => `$x + $y + $y') and related
190# parentheses hacks. The major disadvantage of this scheme is that
191# it doesn't know about right sides and left sides, so say if you
192# assign a listop to a variable, it can't tell it's allowed to leave
193# the parens off the listop.
194
195# Precedences:
196# 26 [TODO] inside interpolation context ("")
197# 25 left terms and list operators (leftward)
198# 24 left ->
199# 23 nonassoc ++ --
200# 22 right **
201# 21 right ! ~ \ and unary + and -
202# 20 left =~ !~
203# 19 left * / % x
204# 18 left + - .
205# 17 left << >>
206# 16 nonassoc named unary operators
207# 15 nonassoc < > <= >= lt gt le ge
208# 14 nonassoc == != <=> eq ne cmp
209# 13 left &
210# 12 left | ^
211# 11 left &&
212# 10 left ||
213# 9 nonassoc .. ...
214# 8 right ?:
215# 7 right = += -= *= etc.
216# 6 left , =>
217# 5 nonassoc list operators (rightward)
218# 4 right not
219# 3 left and
220# 2 left or xor
221# 1 statement modifiers
222# 0 statement level
223
6ec152c3
RH
224# Also, lineseq may pass a fourth parameter to the pp_ routines:
225# if present, the fourth parameter is passed on by deparse.
226#
227# If present and true, it means that the op exists directly as
ce4e655d 228# part of a lineseq. Currently it's only used by scopeop to
6ec152c3
RH
229# decide whether its results need to be enclosed in a do {} block.
230
9d2c6865
SM
231# Nonprinting characters with special meaning:
232# \cS - steal parens (see maybe_parens_unop)
233# \n - newline and indent
234# \t - increase indent
235# \b - decrease indent (`outdent')
f5aa8f4e 236# \f - flush left (no indent)
9d2c6865 237# \cK - kill following semicolon, if any
6e90668e
SM
238
239sub null {
240 my $op = shift;
241 return class($op) eq "NULL";
242}
243
244sub todo {
245 my $self = shift;
34a48b4b 246 my($cv, $is_form) = @_;
e31885a0 247 return unless ($cv->FILE eq $0 || exists $self->{files}{$cv->FILE});
6e90668e
SM
248 my $seq;
249 if (!null($cv->START) and is_state($cv->START)) {
250 $seq = $cv->START->cop_seq;
251 } else {
252 $seq = 0;
253 }
34a48b4b 254 push @{$self->{'subs_todo'}}, [$seq, $cv, $is_form];
6e90668e
SM
255}
256
257sub next_todo {
258 my $self = shift;
259 my $ent = shift @{$self->{'subs_todo'}};
34a48b4b
RH
260 my $cv = $ent->[1];
261 my $gv = $cv->GV;
262 my $name = $self->gv_name($gv);
6e90668e
SM
263 if ($ent->[2]) {
264 return "format $name =\n"
e31885a0 265 . $self->deparse_format($ent->[1]). "\n";
6e90668e 266 } else {
0ca62a8e 267 $self->{'subs_declared'}{$name} = 1;
34a48b4b
RH
268 if ($name eq "BEGIN") {
269 my $use_dec = $self->begin_is_use($cv);
0e7fe0f0
RH
270 if (defined ($use_dec)) {
271 return () if 0 == length($use_dec);
272 return $use_dec;
273 }
34a48b4b 274 }
a0035eb8
RH
275 my $l = '';
276 if ($self->{'linenums'}) {
277 my $line = $gv->LINE;
278 my $file = $gv->FILE;
279 $l = "\n\f#line $line \"$file\"\n";
280 }
281 return "${l}sub $name " . $self->deparse_sub($cv);
34a48b4b
RH
282 }
283}
284
285# Return a "use" declaration for this BEGIN block, if appropriate
286sub begin_is_use {
287 my ($self, $cv) = @_;
288 my $root = $cv->ROOT;
80dc0729 289 local @$self{qw'curcv curcvlex'} = ($cv);
34a48b4b
RH
290#require B::Debug;
291#B::walkoptree($cv->ROOT, "debug");
292 my $lineseq = $root->first;
293 return if $lineseq->name ne "lineseq";
294
295 my $req_op = $lineseq->first->sibling;
296 return if $req_op->name ne "require";
297
298 my $module;
299 if ($req_op->first->private & OPpCONST_BARE) {
300 # Actually it should always be a bareword
301 $module = $self->const_sv($req_op->first)->PV;
302 $module =~ s[/][::]g;
303 $module =~ s/.pm$//;
304 }
305 else {
306 $module = const($self->const_sv($req_op->first));
307 }
308
309 my $version;
310 my $version_op = $req_op->sibling;
311 return if class($version_op) eq "NULL";
312 if ($version_op->name eq "lineseq") {
313 # We have a version parameter; skip nextstate & pushmark
314 my $constop = $version_op->first->next->next;
315
316 return unless $self->const_sv($constop)->PV eq $module;
317 $constop = $constop->sibling;
34a48b4b
RH
318 $version = $self->const_sv($constop)->int_value;
319 $constop = $constop->sibling;
320 return if $constop->name ne "method_named";
321 return if $self->const_sv($constop)->PV ne "VERSION";
322 }
323
324 $lineseq = $version_op->sibling;
325 return if $lineseq->name ne "lineseq";
326 my $entersub = $lineseq->first->sibling;
327 if ($entersub->name eq "stub") {
328 return "use $module $version ();\n" if defined $version;
329 return "use $module ();\n";
330 }
331 return if $entersub->name ne "entersub";
332
333 # See if there are import arguments
334 my $args = '';
335
6ec152c3
RH
336 my $svop = $entersub->first->sibling; # Skip over pushmark
337 return unless $self->const_sv($svop)->PV eq $module;
34a48b4b
RH
338
339 # Pull out the arguments
6ec152c3
RH
340 for ($svop=$svop->sibling; $svop->name ne "method_named";
341 $svop = $svop->sibling) {
34a48b4b 342 $args .= ", " if length($args);
6ec152c3 343 $args .= $self->deparse($svop, 6);
34a48b4b
RH
344 }
345
346 my $use = 'use';
6ec152c3 347 my $method_named = $svop;
34a48b4b
RH
348 return if $method_named->name ne "method_named";
349 my $method_name = $self->const_sv($method_named)->PV;
350
351 if ($method_name eq "unimport") {
352 $use = 'no';
353 }
354
355 # Certain pragmas are dealt with using hint bits,
356 # so we ignore them here
357 if ($module eq 'strict' || $module eq 'integer'
0e7fe0f0 358 || $module eq 'bytes' || $module eq 'warnings') {
34a48b4b
RH
359 return "";
360 }
361
362 if (defined $version && length $args) {
363 return "$use $module $version ($args);\n";
364 } elsif (defined $version) {
365 return "$use $module $version;\n";
366 } elsif (length $args) {
367 return "$use $module ($args);\n";
368 } else {
369 return "$use $module;\n";
6e90668e
SM
370 }
371}
372
6e90668e 373sub stash_subs {
34a48b4b
RH
374 my ($self, $pack) = @_;
375 my (@ret, $stash);
376 if (!defined $pack) {
377 $pack = '';
378 $stash = \%::;
f5aa8f4e 379 }
34a48b4b
RH
380 else {
381 $pack =~ s/(::)?$/::/;
382 no strict 'refs';
383 $stash = \%$pack;
384 }
385 my %stash = svref_2object($stash)->ARRAY;
386 while (my ($key, $val) = each %stash) {
387 next if $key eq 'main::'; # avoid infinite recursion
f5aa8f4e
SM
388 my $class = class($val);
389 if ($class eq "PV") {
a0035eb8
RH
390 # Just a prototype. As an ugly but fairly effective way
391 # to find out if it belongs here is to see if the AUTOLOAD
392 # (if any) for the stash was defined in one of our files.
393 my $A = $stash{"AUTOLOAD"};
394 if (defined ($A) && class($A) eq "GV" && defined($A->CV)
395 && class($A->CV) eq "CV") {
396 my $AF = $A->FILE;
397 next unless $AF eq $0 || exists $self->{'files'}{$AF};
398 }
f5aa8f4e
SM
399 push @{$self->{'protos_todo'}}, [$pack . $key, $val->PV];
400 } elsif ($class eq "IV") {
a0035eb8
RH
401 # Just a name. As above.
402 my $A = $stash{"AUTOLOAD"};
403 if (defined ($A) && class($A) eq "GV" && defined($A->CV)
404 && class($A->CV) eq "CV") {
405 my $AF = $A->FILE;
406 next unless $AF eq $0 || exists $self->{'files'}{$AF};
407 }
f5aa8f4e
SM
408 push @{$self->{'protos_todo'}}, [$pack . $key, undef];
409 } elsif ($class eq "GV") {
34a48b4b 410 if (class(my $cv = $val->CV) ne "SPECIAL") {
f5aa8f4e 411 next if $self->{'subs_done'}{$$val}++;
e31885a0 412 next if $$val != ${$cv->GV}; # Ignore imposters
8510e997 413 $self->todo($cv, 0);
f5aa8f4e 414 }
e31885a0 415 if (class(my $cv = $val->FORM) ne "SPECIAL") {
f5aa8f4e 416 next if $self->{'forms_done'}{$$val}++;
e31885a0
RH
417 next if $$val != ${$cv->GV}; # Ignore imposters
418 $self->todo($cv, 1);
f5aa8f4e 419 }
34a48b4b
RH
420 if (class($val->HV) ne "SPECIAL" && $key =~ /::$/) {
421 $self->stash_subs($pack . $key);
422 }
6e90668e
SM
423 }
424 }
425}
a798dbf2 426
f5aa8f4e
SM
427sub print_protos {
428 my $self = shift;
429 my $ar;
430 my @ret;
431 foreach $ar (@{$self->{'protos_todo'}}) {
432 my $proto = (defined $ar->[1] ? " (". $ar->[1] . ")" : "");
433 push @ret, "sub " . $ar->[0] . "$proto;\n";
434 }
435 delete $self->{'protos_todo'};
436 return @ret;
437}
438
9d2c6865
SM
439sub style_opts {
440 my $self = shift;
441 my $opts = shift;
442 my $opt;
443 while (length($opt = substr($opts, 0, 1))) {
444 if ($opt eq "C") {
445 $self->{'cuddle'} = " ";
f4a44678
SM
446 $opts = substr($opts, 1);
447 } elsif ($opt eq "i") {
448 $opts =~ s/^i(\d+)//;
449 $self->{'indent_size'} = $1;
450 } elsif ($opt eq "T") {
451 $self->{'use_tabs'} = 1;
452 $opts = substr($opts, 1);
453 } elsif ($opt eq "v") {
454 $opts =~ s/^v([^.]*)(.|$)//;
455 $self->{'ex_const'} = $1;
9d2c6865 456 }
9d2c6865
SM
457 }
458}
459
f4a44678
SM
460sub new {
461 my $class = shift;
462 my $self = bless {}, $class;
463 $self->{'subs_todo'} = [];
34a48b4b 464 $self->{'files'} = {};
f4a44678 465 $self->{'curstash'} = "main";
34a48b4b 466 $self->{'curcop'} = undef;
f4a44678
SM
467 $self->{'cuddle'} = "\n";
468 $self->{'indent_size'} = 4;
469 $self->{'use_tabs'} = 0;
793e2a70
RH
470 $self->{'expand'} = 0;
471 $self->{'unquote'} = 0;
472 $self->{'linenums'} = 0;
473 $self->{'parens'} = 0;
f4a44678 474 $self->{'ex_const'} = "'???'";
08c6f5ec
RH
475
476 $self->{'ambient_arybase'} = 0;
e31885a0 477 $self->{'ambient_warnings'} = undef; # Assume no lexical warnings
a0405c92 478 $self->{'ambient_hints'} = 0;
08c6f5ec
RH
479 $self->init();
480
f4a44678 481 while (my $arg = shift @_) {
34a48b4b
RH
482 if ($arg =~ /^-f(.*)/) {
483 $self->{'files'}{$1} = 1;
f4a44678
SM
484 } elsif ($arg eq "-p") {
485 $self->{'parens'} = 1;
486 } elsif ($arg eq "-l") {
487 $self->{'linenums'} = 1;
488 } elsif ($arg eq "-q") {
489 $self->{'unquote'} = 1;
490 } elsif (substr($arg, 0, 2) eq "-s") {
491 $self->style_opts(substr $arg, 2);
58cccf98
SM
492 } elsif ($arg =~ /^-x(\d)$/) {
493 $self->{'expand'} = $1;
f4a44678
SM
494 }
495 }
496 return $self;
497}
498
810aef70
RH
499{
500 # Mask out the bits that L<warnings::register> uses
501 my $WARN_MASK;
502 BEGIN {
503 $WARN_MASK = $warnings::Bits{all} | $warnings::DeadBits{all};
504 }
505 sub WARN_MASK () {
506 return $WARN_MASK;
507 }
34a48b4b
RH
508}
509
08c6f5ec
RH
510# Initialise the contextual information, either from
511# defaults provided with the ambient_pragmas method,
512# or from perl's own defaults otherwise.
513sub init {
514 my $self = shift;
515
516 $self->{'arybase'} = $self->{'ambient_arybase'};
e31885a0
RH
517 $self->{'warnings'} = defined ($self->{'ambient_warnings'})
518 ? $self->{'ambient_warnings'} & WARN_MASK
519 : undef;
a0405c92 520 $self->{'hints'} = $self->{'ambient_hints'} & 0xFF;
217aba5d
RH
521
522 # also a convenient place to clear out subs_declared
523 delete $self->{'subs_declared'};
08c6f5ec
RH
524}
525
a798dbf2 526sub compile {
6e90668e
SM
527 my(@args) = @_;
528 return sub {
f4a44678 529 my $self = B::Deparse->new(@args);
d2bc402e
RGS
530 # First deparse command-line args
531 if (defined $^I) { # deparse -i
532 print q(BEGIN { $^I = ).cstring($^I).qq(; }\n);
533 }
534 if ($^W) { # deparse -w
535 print qq(BEGIN { \$^W = $^W; }\n);
536 }
537 if ($/ ne "\n" or defined $O::savebackslash) { # deparse -l and -0
538 my $fs = cstring($/) || 'undef';
539 my $bs = cstring($O::savebackslash) || 'undef';
540 print qq(BEGIN { \$/ = $fs; \$\\ = $bs; }\n);
541 }
34a48b4b
RH
542 my @BEGINs = B::begin_av->isa("B::AV") ? B::begin_av->ARRAY : ();
543 my @INITs = B::init_av->isa("B::AV") ? B::init_av->ARRAY : ();
544 my @ENDs = B::end_av->isa("B::AV") ? B::end_av->ARRAY : ();
545 for my $block (@BEGINs, @INITs, @ENDs) {
e31885a0 546 $self->todo($block, 0);
34a48b4b
RH
547 }
548 $self->stash_subs();
6e90668e 549 $self->{'curcv'} = main_cv;
8510e997 550 $self->{'curcvlex'} = undef;
f5aa8f4e 551 print $self->print_protos;
6e90668e 552 @{$self->{'subs_todo'}} =
f4a44678
SM
553 sort {$a->[0] <=> $b->[0]} @{$self->{'subs_todo'}};
554 print $self->indent($self->deparse(main_root, 0)), "\n"
555 unless null main_root;
6e90668e
SM
556 my @text;
557 while (scalar(@{$self->{'subs_todo'}})) {
558 push @text, $self->next_todo;
559 }
6f611a1a 560 print $self->indent(join("", @text)), "\n" if @text;
e31885a0
RH
561
562 # Print __DATA__ section, if necessary
563 no strict 'refs';
564 if (defined *{$self->{'curstash'}."::DATA"}{IO}) {
565 print "__DATA__\n";
566 print readline(*{$self->{'curstash'}."::DATA"});
567 }
a798dbf2 568 }
a798dbf2
MB
569}
570
f4a44678
SM
571sub coderef2text {
572 my $self = shift;
573 my $sub = shift;
574 croak "Usage: ->coderef2text(CODEREF)" unless ref($sub) eq "CODE";
08c6f5ec
RH
575
576 $self->init();
f4a44678
SM
577 return $self->indent($self->deparse_sub(svref_2object($sub)));
578}
579
08c6f5ec
RH
580sub ambient_pragmas {
581 my $self = shift;
e31885a0 582 my ($arybase, $hint_bits, $warning_bits) = (0, 0);
08c6f5ec
RH
583
584 while (@_ > 1) {
585 my $name = shift();
586 my $val = shift();
587
588 if ($name eq 'strict') {
589 require strict;
590
591 if ($val eq 'none') {
592 $hint_bits &= ~strict::bits(qw/refs subs vars/);
593 next();
594 }
595
596 my @names;
597 if ($val eq "all") {
598 @names = qw/refs subs vars/;
599 }
600 elsif (ref $val) {
601 @names = @$val;
602 }
603 else {
a0405c92 604 @names = split' ', $val;
08c6f5ec
RH
605 }
606 $hint_bits |= strict::bits(@names);
607 }
608
609 elsif ($name eq '$[') {
610 $arybase = $val;
611 }
612
a0405c92
RH
613 elsif ($name eq 'integer'
614 || $name eq 'bytes'
615 || $name eq 'utf8') {
616 require "$name.pm";
08c6f5ec 617 if ($val) {
a0405c92
RH
618 $hint_bits |= ${$::{"${name}::"}{"hint_bits"}};
619 }
620 else {
621 $hint_bits &= ~${$::{"${name}::"}{"hint_bits"}};
622 }
623 }
624
625 elsif ($name eq 're') {
626 require re;
627 if ($val eq 'none') {
2570cdf1 628 $hint_bits &= ~re::bits(qw/taint eval/);
a0405c92
RH
629 next();
630 }
631
632 my @names;
633 if ($val eq 'all') {
2570cdf1 634 @names = qw/taint eval/;
a0405c92
RH
635 }
636 elsif (ref $val) {
637 @names = @$val;
08c6f5ec
RH
638 }
639 else {
a0405c92 640 @names = split' ',$val;
08c6f5ec 641 }
a0405c92 642 $hint_bits |= re::bits(@names);
08c6f5ec
RH
643 }
644
645 elsif ($name eq 'warnings') {
08c6f5ec 646 if ($val eq 'none') {
810aef70 647 $warning_bits = $warnings::NONE;
08c6f5ec
RH
648 next();
649 }
650
651 my @names;
652 if (ref $val) {
653 @names = @$val;
654 }
655 else {
656 @names = split/\s+/, $val;
657 }
658
810aef70 659 $warning_bits = $warnings::NONE if !defined ($warning_bits);
08c6f5ec
RH
660 $warning_bits |= warnings::bits(@names);
661 }
662
663 elsif ($name eq 'warning_bits') {
664 $warning_bits = $val;
665 }
666
667 elsif ($name eq 'hint_bits') {
668 $hint_bits = $val;
669 }
670
671 else {
672 croak "Unknown pragma type: $name";
673 }
674 }
675 if (@_) {
676 croak "The ambient_pragmas method expects an even number of args";
677 }
678
679 $self->{'ambient_arybase'} = $arybase;
680 $self->{'ambient_warnings'} = $warning_bits;
a0405c92 681 $self->{'ambient_hints'} = $hint_bits;
08c6f5ec
RH
682}
683
6e90668e
SM
684sub deparse {
685 my $self = shift;
6ec152c3 686 my($op, $cx, $flags) = @_;
34a48b4b
RH
687
688 Carp::confess("Null op in deparse") if !defined($op)
689 || class($op) eq "NULL";
3f872cb9 690 my $meth = "pp_" . $op->name;
ce4e655d
RH
691 if (is_scope($op)) {
692 return $self->$meth($op, $cx, $flags);
6ec152c3 693 }
9d2c6865 694 return $self->$meth($op, $cx);
a798dbf2
MB
695}
696
6e90668e 697sub indent {
f4a44678 698 my $self = shift;
6e90668e
SM
699 my $txt = shift;
700 my @lines = split(/\n/, $txt);
701 my $leader = "";
f4a44678 702 my $level = 0;
6e90668e
SM
703 my $line;
704 for $line (@lines) {
f4a44678
SM
705 my $cmd = substr($line, 0, 1);
706 if ($cmd eq "\t" or $cmd eq "\b") {
707 $level += ($cmd eq "\t" ? 1 : -1) * $self->{'indent_size'};
708 if ($self->{'use_tabs'}) {
709 $leader = "\t" x ($level / 8) . " " x ($level % 8);
710 } else {
711 $leader = " " x $level;
712 }
6e90668e
SM
713 $line = substr($line, 1);
714 }
f5aa8f4e
SM
715 if (substr($line, 0, 1) eq "\f") {
716 $line = substr($line, 1); # no indent
717 } else {
718 $line = $leader . $line;
719 }
9d2c6865 720 $line =~ s/\cK;?//g;
6e90668e
SM
721 }
722 return join("\n", @lines);
723}
724
6e90668e
SM
725sub deparse_sub {
726 my $self = shift;
727 my $cv = shift;
728 my $proto = "";
ce4e655d 729Carp::confess("NULL in deparse_sub") if !defined($cv) || $cv->isa("B::NULL");
34a48b4b
RH
730Carp::confess("SPECIAL in deparse_sub") if $cv->isa("B::SPECIAL");
731 local $self->{'curcop'} = $self->{'curcop'};
6e90668e
SM
732 if ($cv->FLAGS & SVf_POK) {
733 $proto = "(". $cv->PV . ") ";
734 }
6aaf4108
SC
735 if ($cv->CvFLAGS & (CVf_METHOD|CVf_LOCKED|CVf_LVALUE)) {
736 $proto .= ": ";
737 $proto .= "lvalue " if $cv->CvFLAGS & CVf_LVALUE;
738 $proto .= "locked " if $cv->CvFLAGS & CVf_LOCKED;
739 $proto .= "method " if $cv->CvFLAGS & CVf_METHOD;
740 }
741
6e90668e 742 local($self->{'curcv'}) = $cv;
8510e997 743 local($self->{'curcvlex'});
a0405c92
RH
744 local(@$self{qw'curstash warnings hints'})
745 = @$self{qw'curstash warnings hints'};
ce4e655d 746 my $body;
6e90668e 747 if (not null $cv->ROOT) {
ce4e655d
RH
748 my $lineseq = $cv->ROOT->first;
749 if ($lineseq->name eq "lineseq") {
750 my @ops;
751 for(my$o=$lineseq->first; $$o; $o=$o->sibling) {
752 push @ops, $o;
753 }
754 $body = $self->lineseq(undef, @ops).";";
755 my $scope_en = $self->find_scope_en($lineseq);
756 if (defined $scope_en) {
757 my $subs = join"", $self->seq_subs($scope_en);
758 $body .= ";\n$subs" if length($subs);
759 }
760 }
761 else {
762 $body = $self->deparse($cv->ROOT->first, 0);
763 }
de3f1649 764 }
ce4e655d
RH
765 else {
766 my $sv = $cv->const_sv;
767 if ($$sv) {
768 # uh-oh. inlinable sub... format it differently
769 return $proto . "{ " . const($sv) . " }\n";
770 } else { # XSUB? (or just a declaration)
771 return "$proto;\n";
772 }
6e90668e 773 }
ce4e655d 774 return $proto ."{\n\t$body\n\b}" ."\n";
6e90668e
SM
775}
776
777sub deparse_format {
778 my $self = shift;
779 my $form = shift;
780 my @text;
781 local($self->{'curcv'}) = $form;
8510e997 782 local($self->{'curcvlex'});
67fc2416 783 local($self->{'in_format'}) = 1;
a0405c92 784 local(@$self{qw'curstash warnings hints'})
67fc2416 785 = @$self{qw'curstash warnings hints'};
6e90668e
SM
786 my $op = $form->ROOT;
787 my $kid;
32f2ae54 788 return "\f." if $op->first->name eq 'stub';
6e90668e
SM
789 $op = $op->first->first; # skip leavewrite, lineseq
790 while (not null $op) {
791 $op = $op->sibling; # skip nextstate
792 my @exprs;
793 $kid = $op->first->sibling; # skip pushmark
a5b0cd91 794 push @text, "\f".$self->const_sv($kid)->PV;
6e90668e
SM
795 $kid = $kid->sibling;
796 for (; not null $kid; $kid = $kid->sibling) {
9d2c6865 797 push @exprs, $self->deparse($kid, 0);
6e90668e 798 }
a5b0cd91 799 push @text, "\f".join(", ", @exprs)."\n" if @exprs;
6e90668e
SM
800 $op = $op->sibling;
801 }
a5b0cd91 802 return join("", @text) . "\f.";
6e90668e
SM
803}
804
6e90668e 805sub is_scope {
a798dbf2 806 my $op = shift;
3f872cb9
GS
807 return $op->name eq "leave" || $op->name eq "scope"
808 || $op->name eq "lineseq"
809 || ($op->name eq "null" && class($op) eq "UNOP"
810 && (is_scope($op->first) || $op->first->name eq "enter"));
6e90668e
SM
811}
812
813sub is_state {
3f872cb9
GS
814 my $name = $_[0]->name;
815 return $name eq "nextstate" || $name eq "dbstate" || $name eq "setstate";
6e90668e
SM
816}
817
818sub is_miniwhile { # check for one-line loop (`foo() while $y--')
819 my $op = shift;
820 return (!null($op) and null($op->sibling)
3f872cb9
GS
821 and $op->name eq "null" and class($op) eq "UNOP"
822 and (($op->first->name =~ /^(and|or)$/
823 and $op->first->first->sibling->name eq "lineseq")
824 or ($op->first->name eq "lineseq"
6e90668e 825 and not null $op->first->first->sibling
3f872cb9 826 and $op->first->first->sibling->name eq "unstack")
6e90668e
SM
827 ));
828}
829
830sub is_scalar {
831 my $op = shift;
3f872cb9
GS
832 return ($op->name eq "rv2sv" or
833 $op->name eq "padsv" or
834 $op->name eq "gv" or # only in array/hash constructs
bd0865ec 835 $op->flags & OPf_KIDS && !null($op->first)
3f872cb9 836 && $op->first->name eq "gvsv");
6e90668e
SM
837}
838
9d2c6865
SM
839sub maybe_parens {
840 my $self = shift;
841 my($text, $cx, $prec) = @_;
842 if ($prec < $cx # unary ops nest just fine
843 or $prec == $cx and $cx != 4 and $cx != 16 and $cx != 21
844 or $self->{'parens'})
845 {
846 $text = "($text)";
847 # In a unop, let parent reuse our parens; see maybe_parens_unop
848 $text = "\cS" . $text if $cx == 16;
849 return $text;
850 } else {
851 return $text;
852 }
853}
854
855# same as above, but get around the `if it looks like a function' rule
856sub maybe_parens_unop {
857 my $self = shift;
858 my($name, $kid, $cx) = @_;
859 if ($cx > 16 or $self->{'parens'}) {
a0035eb8
RH
860 $kid = $self->deparse($kid, 1);
861 if ($name eq "umask" && $kid =~ /^\d+$/) {
862 $kid = sprintf("%#o", $kid);
863 }
864 return "$name($kid)";
9d2c6865
SM
865 } else {
866 $kid = $self->deparse($kid, 16);
a0035eb8
RH
867 if ($name eq "umask" && $kid =~ /^\d+$/) {
868 $kid = sprintf("%#o", $kid);
869 }
9d2c6865
SM
870 if (substr($kid, 0, 1) eq "\cS") {
871 # use kid's parens
872 return $name . substr($kid, 1);
873 } elsif (substr($kid, 0, 1) eq "(") {
874 # avoid looks-like-a-function trap with extra parens
875 # (`+' can lead to ambiguities)
876 return "$name(" . $kid . ")";
877 } else {
878 return "$name $kid";
879 }
880 }
881}
882
883sub maybe_parens_func {
884 my $self = shift;
885 my($func, $text, $cx, $prec) = @_;
886 if ($prec <= $cx or substr($text, 0, 1) eq "(" or $self->{'parens'}) {
887 return "$func($text)";
888 } else {
889 return "$func $text";
890 }
891}
892
6e90668e
SM
893sub maybe_local {
894 my $self = shift;
9d2c6865 895 my($op, $cx, $text) = @_;
ce4e655d
RH
896 my $our_intro = ($op->name =~ /^(gv|rv2)[ash]v$/) ? OPpOUR_INTRO : 0;
897 if ($op->private & (OPpLVAL_INTRO|$our_intro)
898 and not $self->{'avoid_local'}{$$op}) {
899 my $our_local = ($op->private & OPpLVAL_INTRO) ? "local" : "our";
e8d3f51b 900 if (want_scalar($op)) {
ce4e655d 901 return "$our_local $text";
e8d3f51b 902 } else {
ce4e655d 903 return $self->maybe_parens_func("$our_local", $text, $cx, 16);
e8d3f51b 904 }
6e90668e
SM
905 } else {
906 return $text;
a798dbf2 907 }
a798dbf2
MB
908}
909
3ed82cfc
GS
910sub maybe_targmy {
911 my $self = shift;
912 my($op, $cx, $func, @args) = @_;
913 if ($op->private & OPpTARGET_MY) {
914 my $var = $self->padname($op->targ);
915 my $val = $func->($self, $op, 7, @args);
916 return $self->maybe_parens("$var = $val", $cx, 7);
917 } else {
918 return $func->($self, $op, $cx, @args);
919 }
920}
921
6e90668e
SM
922sub padname_sv {
923 my $self = shift;
924 my $targ = shift;
925 return (($self->{'curcv'}->PADLIST->ARRAY)[0]->ARRAY)[$targ];
926}
927
928sub maybe_my {
929 my $self = shift;
9d2c6865 930 my($op, $cx, $text) = @_;
4c1f658f 931 if ($op->private & OPpLVAL_INTRO and not $self->{'avoid_local'}{$$op}) {
e8d3f51b
RH
932 if (want_scalar($op)) {
933 return "my $text";
934 } else {
935 return $self->maybe_parens_func("my", $text, $cx, 16);
936 }
6e90668e
SM
937 } else {
938 return $text;
939 }
940}
941
9d2c6865
SM
942# The following OPs don't have functions:
943
944# pp_padany -- does not exist after parsing
9d2c6865
SM
945
946sub pp_enter { # see also leave
947 cluck "unexpected OP_ENTER";
948 return "XXX";
949}
950
951sub pp_pushmark { # see also list
952 cluck "unexpected OP_PUSHMARK";
953 return "XXX";
954}
955
956sub pp_leavesub { # see also deparse_sub
957 cluck "unexpected OP_LEAVESUB";
958 return "XXX";
959}
960
961sub pp_leavewrite { # see also deparse_format
962 cluck "unexpected OP_LEAVEWRITE";
963 return "XXX";
964}
965
966sub pp_method { # see also entersub
967 cluck "unexpected OP_METHOD";
968 return "XXX";
969}
970
971sub pp_regcmaybe { # see also regcomp
972 cluck "unexpected OP_REGCMAYBE";
973 return "XXX";
974}
975
90be192f
SM
976sub pp_regcreset { # see also regcomp
977 cluck "unexpected OP_REGCRESET";
978 return "XXX";
979}
980
9d2c6865
SM
981sub pp_substcont { # see also subst
982 cluck "unexpected OP_SUBSTCONT";
983 return "XXX";
984}
985
986sub pp_grepstart { # see also grepwhile
987 cluck "unexpected OP_GREPSTART";
988 return "XXX";
989}
990
991sub pp_mapstart { # see also mapwhile
992 cluck "unexpected OP_MAPSTART";
993 return "XXX";
994}
995
90c0eb26
RH
996sub pp_method_named {
997 cluck "unexpected OP_METHOD_NAMED";
998 return "XXX";
999}
1000
9d2c6865
SM
1001sub pp_flip { # see also flop
1002 cluck "unexpected OP_FLIP";
1003 return "XXX";
1004}
1005
1006sub pp_iter { # see also leaveloop
1007 cluck "unexpected OP_ITER";
1008 return "XXX";
1009}
1010
1011sub pp_enteriter { # see also leaveloop
1012 cluck "unexpected OP_ENTERITER";
1013 return "XXX";
1014}
1015
1016sub pp_enterloop { # see also leaveloop
1017 cluck "unexpected OP_ENTERLOOP";
1018 return "XXX";
1019}
1020
1021sub pp_leaveeval { # see also entereval
1022 cluck "unexpected OP_LEAVEEVAL";
1023 return "XXX";
1024}
1025
1026sub pp_entertry { # see also leavetry
1027 cluck "unexpected OP_ENTERTRY";
1028 return "XXX";
1029}
6e90668e 1030
ce4e655d
RH
1031# $root should be the op which represents the root of whatever
1032# we're sequencing here. If it's undefined, then we don't append
1033# any subroutine declarations to the deparsed ops, otherwise we
1034# append appropriate declarations.
58cccf98 1035sub lineseq {
ce4e655d 1036 my($self, $root, @ops) = @_;
58cccf98 1037 my($expr, @exprs);
ce4e655d
RH
1038
1039 my $out_cop = $self->{'curcop'};
1040 my $out_seq = defined($out_cop) ? $out_cop->cop_seq : undef;
1041 my $limit_seq;
1042 if (defined $root) {
1043 $limit_seq = $out_seq;
1044 my $nseq = $self->find_scope_st($root->sibling) if ${$root->sibling};
1045 $limit_seq = $nseq if !defined($limit_seq)
1046 or defined($nseq) && $nseq < $limit_seq;
1047 }
1048 $limit_seq = $self->{'limit_seq'}
1049 if defined($self->{'limit_seq'})
1050 && (!defined($limit_seq) || $self->{'limit_seq'} < $limit_seq);
1051 local $self->{'limit_seq'} = $limit_seq;
58cccf98 1052 for (my $i = 0; $i < @ops; $i++) {
6e90668e 1053 $expr = "";
58cccf98
SM
1054 if (is_state $ops[$i]) {
1055 $expr = $self->deparse($ops[$i], 0);
1056 $i++;
e99ebc55
RH
1057 if ($i > $#ops) {
1058 push @exprs, $expr;
1059 last;
1060 }
58cccf98 1061 }
c73811ab
RH
1062 if (!is_state $ops[$i] and (my $ls = $ops[$i+1]) and
1063 !null($ops[$i+1]) and $ops[$i+1]->name eq "lineseq")
58cccf98 1064 {
c73811ab
RH
1065 if ($ls->first && !null($ls->first) && is_state($ls->first)
1066 && (my $sib = $ls->first->sibling)) {
1067 if (!null($sib) && $sib->name eq "leaveloop") {
1068 push @exprs, $expr . $self->for_loop($ops[$i], 0);
1069 $i++;
1070 next;
1071 }
1072 }
6e90668e 1073 }
6ec152c3 1074 $expr .= $self->deparse($ops[$i], 0, (@ops != 1));
e99ebc55 1075 $expr =~ s/;\n?\z//;
f99a63a2 1076 push @exprs, $expr;
6e90668e 1077 }
ce4e655d
RH
1078 my $body = join(";\n", grep {length} @exprs);
1079 my $subs = "";
67fc2416 1080 if (defined $root && defined $limit_seq && !$self->{'in_format'}) {
ce4e655d
RH
1081 $subs = join "\n", $self->seq_subs($limit_seq);
1082 }
1083 return join(";\n", grep {length} $body, $subs);
6e90668e
SM
1084}
1085
58cccf98 1086sub scopeop {
ce4e655d 1087 my($real_block, $self, $op, $cx, $flags) = @_;
58cccf98
SM
1088 my $kid;
1089 my @kids;
a0405c92
RH
1090
1091 local(@$self{qw'curstash warnings hints'})
1092 = @$self{qw'curstash warnings hints'} if $real_block;
58cccf98
SM
1093 if ($real_block) {
1094 $kid = $op->first->sibling; # skip enter
1095 if (is_miniwhile($kid)) {
1096 my $top = $kid->first;
1097 my $name = $top->name;
1098 if ($name eq "and") {
1099 $name = "while";
1100 } elsif ($name eq "or") {
1101 $name = "until";
1102 } else { # no conditional -> while 1 or until 0
1103 return $self->deparse($top->first, 1) . " while 1";
1104 }
1105 my $cond = $top->first;
1106 my $body = $cond->sibling->first; # skip lineseq
1107 $cond = $self->deparse($cond, 1);
1108 $body = $self->deparse($body, 1);
1109 return "$body $name $cond";
6e90668e 1110 }
58cccf98
SM
1111 } else {
1112 $kid = $op->first;
1113 }
1114 for (; !null($kid); $kid = $kid->sibling) {
1115 push @kids, $kid;
6e90668e 1116 }
ce4e655d
RH
1117 if ($flags || $cx > 0) { # inside an expression, (a do {} while for lineseq)
1118 return "do {\n\t" . $self->lineseq($op, @kids) . "\n\b}";
9d2c6865 1119 } else {
ce4e655d 1120 my $lineseq = $self->lineseq($op, @kids);
7a9b44b9 1121 return (length ($lineseq) ? "$lineseq;" : "");
6e90668e 1122 }
6e90668e
SM
1123}
1124
ce4e655d 1125sub pp_scope { scopeop(0, @_); }
58cccf98
SM
1126sub pp_lineseq { scopeop(0, @_); }
1127sub pp_leave { scopeop(1, @_); }
9d2c6865 1128
6e90668e
SM
1129# The BEGIN {} is used here because otherwise this code isn't executed
1130# when you run B::Deparse on itself.
1131my %globalnames;
1132BEGIN { map($globalnames{$_}++, "SIG", "STDIN", "STDOUT", "STDERR", "INC",
1133 "ENV", "ARGV", "ARGVOUT", "_"); }
1134
1135sub gv_name {
1136 my $self = shift;
1137 my $gv = shift;
34a48b4b 1138Carp::confess() if $gv->isa("B::CV");
6e90668e 1139 my $stash = $gv->STASH->NAME;
d9963e60 1140 my $name = $gv->SAFENAME;
9d2c6865
SM
1141 if ($stash eq $self->{'curstash'} or $globalnames{$name}
1142 or $name =~ /^[^A-Za-z_]/)
1143 {
6e90668e
SM
1144 $stash = "";
1145 } else {
1146 $stash = $stash . "::";
a798dbf2 1147 }
083bda02
MS
1148 if ($name =~ /^(\^..|{)/) {
1149 $name = "{$name}"; # ${^WARNING_BITS}, etc and ${
6e90668e
SM
1150 }
1151 return $stash . $name;
a798dbf2
MB
1152}
1153
8510e997
RH
1154# Return the name to use for a stash variable.
1155# If a lexical with the same name is in scope, it may need to be
1156# fully-qualified.
1157sub stash_variable {
1158 my ($self, $prefix, $name) = @_;
1159
1160 return "$prefix$name" if $name =~ /::/;
1161
1162 unless ($prefix eq '$' || $prefix eq '@' ||
1163 $prefix eq '%' || $prefix eq '$#') {
1164 return "$prefix$name";
1165 }
1166
1167 my $v = ($prefix eq '$#' ? '@' : $prefix) . $name;
1168 return $prefix .$self->{'curstash'}.'::'. $name if $self->lex_in_scope($v);
1169 return "$prefix$name";
1170}
1171
1172sub lex_in_scope {
1173 my ($self, $name) = @_;
1174 $self->populate_curcvlex() if !defined $self->{'curcvlex'};
1175
6ec152c3 1176 return 0 if !defined($self->{'curcop'});
8510e997
RH
1177 my $seq = $self->{'curcop'}->cop_seq;
1178 return 0 if !exists $self->{'curcvlex'}{$name};
1179 for my $a (@{$self->{'curcvlex'}{$name}}) {
1180 my ($st, $en) = @$a;
1181 return 1 if $seq > $st && $seq <= $en;
1182 }
1183 return 0;
1184}
1185
1186sub populate_curcvlex {
1187 my $self = shift;
ce4e655d 1188 for (my $cv = $self->{'curcv'}; class($cv) eq "CV"; $cv = $cv->OUTSIDE) {
8510e997
RH
1189 my @padlist = $cv->PADLIST->ARRAY;
1190 my @ns = $padlist[0]->ARRAY;
1191
1192 for (my $i=0; $i<@ns; ++$i) {
1193 next if class($ns[$i]) eq "SPECIAL";
ce4e655d 1194 next if $ns[$i]->FLAGS & SVpad_OUR; # Skip "our" vars
0f2fe21d
RH
1195 if (class($ns[$i]) eq "PV") {
1196 # Probably that pesky lexical @_
1197 next;
1198 }
8510e997
RH
1199 my $name = $ns[$i]->PVX;
1200 my $seq_st = $ns[$i]->NVX;
1201 my $seq_en = int($ns[$i]->IVX);
1202
1203 push @{$self->{'curcvlex'}{$name}}, [$seq_st, $seq_en];
1204 }
1205 }
1206}
1207
ce4e655d
RH
1208sub find_scope_st { ((find_scope(@_))[0]); }
1209sub find_scope_en { ((find_scope(@_))[1]); }
1210
1211# Recurses down the tree, looking for pad variable introductions and COPs
1212sub find_scope {
1213 my ($self, $op, $scope_st, $scope_en) = @_;
1214Carp::cluck() if !defined $op;
1215 return ($scope_st, $scope_en) unless $op->flags & OPf_KIDS;
1216
1217 for (my $o=$op->first; $$o; $o=$o->sibling) {
1218 if ($o->name =~ /^pad.v$/ && $o->private & OPpLVAL_INTRO) {
1219 my $s = int($self->padname_sv($o->targ)->NVX);
1220 my $e = $self->padname_sv($o->targ)->IVX;
1221 $scope_st = $s if !defined($scope_st) || $s < $scope_st;
1222 $scope_en = $e if !defined($scope_en) || $e > $scope_en;
1223 }
1224 elsif (is_state($o)) {
1225 my $c = $o->cop_seq;
1226 $scope_st = $c if !defined($scope_st) || $c < $scope_st;
1227 $scope_en = $c if !defined($scope_en) || $c > $scope_en;
1228 }
1229 elsif ($o->flags & OPf_KIDS) {
1230 ($scope_st, $scope_en) =
1231 $self->find_scope($o, $scope_st, $scope_en)
34a48b4b
RH
1232 }
1233 }
ce4e655d
RH
1234
1235 return ($scope_st, $scope_en);
34a48b4b
RH
1236}
1237
1238# Returns a list of subs which should be inserted before the COP
1239sub cop_subs {
1240 my ($self, $op, $out_seq) = @_;
1241 my $seq = $op->cop_seq;
1242 # If we have nephews, then our sequence number indicates
1243 # the cop_seq of the end of some sort of scope.
1244 if (class($op->sibling) ne "NULL" && $op->sibling->flags & OPf_KIDS
ce4e655d
RH
1245 and my $nseq = $self->find_scope_st($op->sibling) ) {
1246 $seq = $nseq;
34a48b4b
RH
1247 }
1248 $seq = $out_seq if defined($out_seq) && $out_seq < $seq;
1249 return $self->seq_subs($seq);
1250}
1251
1252sub seq_subs {
1253 my ($self, $seq) = @_;
1254 my @text;
1255#push @text, "# ($seq)\n";
1256
ce4e655d 1257 return "" if !defined $seq;
34a48b4b
RH
1258 while (scalar(@{$self->{'subs_todo'}})
1259 and $seq > $self->{'subs_todo'}[0][0]) {
1260 push @text, $self->next_todo;
1261 }
1262 return @text;
1263}
1264
08c6f5ec 1265# Notice how subs and formats are inserted between statements here;
a0405c92 1266# also $[ assignments and pragmas.
6e90668e
SM
1267sub pp_nextstate {
1268 my $self = shift;
9d2c6865 1269 my($op, $cx) = @_;
34a48b4b 1270 $self->{'curcop'} = $op;
6e90668e 1271 my @text;
34a48b4b 1272 push @text, $self->cop_subs($op);
e99ebc55 1273 push @text, $op->label . ": " if $op->label;
11faa288 1274 my $stash = $op->stashpv;
6e90668e
SM
1275 if ($stash ne $self->{'curstash'}) {
1276 push @text, "package $stash;\n";
1277 $self->{'curstash'} = $stash;
1278 }
f5aa8f4e
SM
1279 if ($self->{'linenums'}) {
1280 push @text, "\f#line " . $op->line .
57843af0 1281 ' "' . $op->file, qq'"\n';
f5aa8f4e 1282 }
08c6f5ec 1283
7a9b44b9
RH
1284 if ($self->{'arybase'} != $op->arybase) {
1285 push @text, '$[ = '. $op->arybase .";\n";
1286 $self->{'arybase'} = $op->arybase;
1287 }
1288
1289 my $warnings = $op->warnings;
1290 my $warning_bits;
1291 if ($warnings->isa("B::SPECIAL") && $$warnings == 4) {
810aef70 1292 $warning_bits = $warnings::Bits{"all"} & WARN_MASK;
7a9b44b9 1293 }
e31885a0 1294 elsif ($warnings->isa("B::SPECIAL") && $$warnings == 5) {
810aef70 1295 $warning_bits = $warnings::NONE;
7a9b44b9 1296 }
e31885a0
RH
1297 elsif ($warnings->isa("B::SPECIAL")) {
1298 $warning_bits = undef;
1299 }
7a9b44b9 1300 else {
34a48b4b 1301 $warning_bits = $warnings->PV & WARN_MASK;
7a9b44b9
RH
1302 }
1303
e31885a0
RH
1304 if (defined ($warning_bits) and
1305 !defined($self->{warnings}) || $self->{'warnings'} ne $warning_bits) {
08c6f5ec 1306 push @text, declare_warnings($self->{'warnings'}, $warning_bits);
7a9b44b9
RH
1307 $self->{'warnings'} = $warning_bits;
1308 }
1309
a0405c92
RH
1310 if ($self->{'hints'} != $op->private) {
1311 push @text, declare_hints($self->{'hints'}, $op->private);
1312 $self->{'hints'} = $op->private;
1313 }
1314
6e90668e
SM
1315 return join("", @text);
1316}
1317
08c6f5ec
RH
1318sub declare_warnings {
1319 my ($from, $to) = @_;
6ec152c3 1320 if (($to & WARN_MASK) eq warnings::bits("all")) {
a0405c92
RH
1321 return "use warnings;\n";
1322 }
6ec152c3 1323 elsif (($to & WARN_MASK) eq "\0"x length($to)) {
a0405c92
RH
1324 return "no warnings;\n";
1325 }
1326 return "BEGIN {\${^WARNING_BITS} = ".cstring($to)."}\n";
1327}
1328
1329sub declare_hints {
1330 my ($from, $to) = @_;
a0035eb8
RH
1331 my $use = $to & ~$from;
1332 my $no = $from & ~$to;
1333 my $decls = "";
1334 for my $pragma (hint_pragmas($use)) {
1335 $decls .= "use $pragma;\n";
1336 }
1337 for my $pragma (hint_pragmas($no)) {
1338 $decls .= "no $pragma;\n";
1339 }
1340 return $decls;
1341}
1342
1343sub hint_pragmas {
1344 my ($bits) = @_;
1345 my @pragmas;
1346 push @pragmas, "integer" if $bits & 0x1;
1347 push @pragmas, "strict 'refs'" if $bits & 0x2;
1348 push @pragmas, "bytes" if $bits & 0x8;
1349 return @pragmas;
08c6f5ec
RH
1350}
1351
6e90668e 1352sub pp_dbstate { pp_nextstate(@_) }
3f872cb9 1353sub pp_setstate { pp_nextstate(@_) }
6e90668e
SM
1354
1355sub pp_unstack { return "" } # see also leaveloop
1356
1357sub baseop {
1358 my $self = shift;
9d2c6865 1359 my($op, $cx, $name) = @_;
6e90668e
SM
1360 return $name;
1361}
1362
e99ebc55
RH
1363sub pp_stub {
1364 my $self = shift;
1365 my($op, $cx, $name) = @_;
1366 if ($cx) {
1367 return "()";
1368 }
1369 else {
1370 return "();";
1371 }
1372}
6e90668e
SM
1373sub pp_wantarray { baseop(@_, "wantarray") }
1374sub pp_fork { baseop(@_, "fork") }
3ed82cfc
GS
1375sub pp_wait { maybe_targmy(@_, \&baseop, "wait") }
1376sub pp_getppid { maybe_targmy(@_, \&baseop, "getppid") }
1377sub pp_time { maybe_targmy(@_, \&baseop, "time") }
6e90668e
SM
1378sub pp_tms { baseop(@_, "times") }
1379sub pp_ghostent { baseop(@_, "gethostent") }
1380sub pp_gnetent { baseop(@_, "getnetent") }
1381sub pp_gprotoent { baseop(@_, "getprotoent") }
1382sub pp_gservent { baseop(@_, "getservent") }
1383sub pp_ehostent { baseop(@_, "endhostent") }
1384sub pp_enetent { baseop(@_, "endnetent") }
1385sub pp_eprotoent { baseop(@_, "endprotoent") }
1386sub pp_eservent { baseop(@_, "endservent") }
1387sub pp_gpwent { baseop(@_, "getpwent") }
1388sub pp_spwent { baseop(@_, "setpwent") }
1389sub pp_epwent { baseop(@_, "endpwent") }
1390sub pp_ggrent { baseop(@_, "getgrent") }
1391sub pp_sgrent { baseop(@_, "setgrent") }
1392sub pp_egrent { baseop(@_, "endgrent") }
1393sub pp_getlogin { baseop(@_, "getlogin") }
1394
1395sub POSTFIX () { 1 }
1396
9d2c6865
SM
1397# I couldn't think of a good short name, but this is the category of
1398# symbolic unary operators with interesting precedence
1399
1400sub pfixop {
1401 my $self = shift;
1402 my($op, $cx, $name, $prec, $flags) = (@_, 0);
1403 my $kid = $op->first;
1404 $kid = $self->deparse($kid, $prec);
1405 return $self->maybe_parens(($flags & POSTFIX) ? "$kid$name" : "$name$kid",
1406 $cx, $prec);
1407}
1408
1409sub pp_preinc { pfixop(@_, "++", 23) }
1410sub pp_predec { pfixop(@_, "--", 23) }
3ed82cfc
GS
1411sub pp_postinc { maybe_targmy(@_, \&pfixop, "++", 23, POSTFIX) }
1412sub pp_postdec { maybe_targmy(@_, \&pfixop, "--", 23, POSTFIX) }
9d2c6865
SM
1413sub pp_i_preinc { pfixop(@_, "++", 23) }
1414sub pp_i_predec { pfixop(@_, "--", 23) }
3ed82cfc
GS
1415sub pp_i_postinc { maybe_targmy(@_, \&pfixop, "++", 23, POSTFIX) }
1416sub pp_i_postdec { maybe_targmy(@_, \&pfixop, "--", 23, POSTFIX) }
68cc8748 1417sub pp_complement { maybe_targmy(@_, \&pfixop, "~", 21) }
9d2c6865 1418
3ed82cfc
GS
1419sub pp_negate { maybe_targmy(@_, \&real_negate) }
1420sub real_negate {
9d2c6865
SM
1421 my $self = shift;
1422 my($op, $cx) = @_;
3f872cb9 1423 if ($op->first->name =~ /^(i_)?negate$/) {
9d2c6865
SM
1424 # avoid --$x
1425 $self->pfixop($op, $cx, "-", 21.5);
1426 } else {
1427 $self->pfixop($op, $cx, "-", 21);
1428 }
1429}
1430sub pp_i_negate { pp_negate(@_) }
1431
1432sub pp_not {
1433 my $self = shift;
1434 my($op, $cx) = @_;
1435 if ($cx <= 4) {
1436 $self->pfixop($op, $cx, "not ", 4);
1437 } else {
1438 $self->pfixop($op, $cx, "!", 21);
1439 }
1440}
1441
6e90668e
SM
1442sub unop {
1443 my $self = shift;
f4a44678 1444 my($op, $cx, $name) = @_;
6e90668e 1445 my $kid;
9d2c6865 1446 if ($op->flags & OPf_KIDS) {
6e90668e 1447 $kid = $op->first;
e31885a0
RH
1448 if (defined prototype("CORE::$name")
1449 && prototype("CORE::$name") =~ /^;?\*/
1450 && $kid->name eq "rv2gv") {
1451 $kid = $kid->first;
1452 }
1453
9d2c6865 1454 return $self->maybe_parens_unop($name, $kid, $cx);
6e90668e 1455 } else {
9d2c6865 1456 return $name . ($op->flags & OPf_SPECIAL ? "()" : "");
6e90668e 1457 }
6e90668e
SM
1458}
1459
3ed82cfc
GS
1460sub pp_chop { maybe_targmy(@_, \&unop, "chop") }
1461sub pp_chomp { maybe_targmy(@_, \&unop, "chomp") }
1462sub pp_schop { maybe_targmy(@_, \&unop, "chop") }
1463sub pp_schomp { maybe_targmy(@_, \&unop, "chomp") }
6e90668e
SM
1464sub pp_defined { unop(@_, "defined") }
1465sub pp_undef { unop(@_, "undef") }
1466sub pp_study { unop(@_, "study") }
6e90668e
SM
1467sub pp_ref { unop(@_, "ref") }
1468sub pp_pos { maybe_local(@_, unop(@_, "pos")) }
1469
3ed82cfc
GS
1470sub pp_sin { maybe_targmy(@_, \&unop, "sin") }
1471sub pp_cos { maybe_targmy(@_, \&unop, "cos") }
1472sub pp_rand { maybe_targmy(@_, \&unop, "rand") }
6e90668e 1473sub pp_srand { unop(@_, "srand") }
3ed82cfc
GS
1474sub pp_exp { maybe_targmy(@_, \&unop, "exp") }
1475sub pp_log { maybe_targmy(@_, \&unop, "log") }
1476sub pp_sqrt { maybe_targmy(@_, \&unop, "sqrt") }
1477sub pp_int { maybe_targmy(@_, \&unop, "int") }
1478sub pp_hex { maybe_targmy(@_, \&unop, "hex") }
1479sub pp_oct { maybe_targmy(@_, \&unop, "oct") }
1480sub pp_abs { maybe_targmy(@_, \&unop, "abs") }
1481
1482sub pp_length { maybe_targmy(@_, \&unop, "length") }
1483sub pp_ord { maybe_targmy(@_, \&unop, "ord") }
1484sub pp_chr { maybe_targmy(@_, \&unop, "chr") }
6e90668e
SM
1485
1486sub pp_each { unop(@_, "each") }
1487sub pp_values { unop(@_, "values") }
1488sub pp_keys { unop(@_, "keys") }
1489sub pp_pop { unop(@_, "pop") }
1490sub pp_shift { unop(@_, "shift") }
1491
1492sub pp_caller { unop(@_, "caller") }
1493sub pp_reset { unop(@_, "reset") }
1494sub pp_exit { unop(@_, "exit") }
1495sub pp_prototype { unop(@_, "prototype") }
1496
1497sub pp_close { unop(@_, "close") }
1498sub pp_fileno { unop(@_, "fileno") }
1499sub pp_umask { unop(@_, "umask") }
6e90668e
SM
1500sub pp_untie { unop(@_, "untie") }
1501sub pp_tied { unop(@_, "tied") }
1502sub pp_dbmclose { unop(@_, "dbmclose") }
1503sub pp_getc { unop(@_, "getc") }
1504sub pp_eof { unop(@_, "eof") }
1505sub pp_tell { unop(@_, "tell") }
1506sub pp_getsockname { unop(@_, "getsockname") }
1507sub pp_getpeername { unop(@_, "getpeername") }
1508
3ed82cfc
GS
1509sub pp_chdir { maybe_targmy(@_, \&unop, "chdir") }
1510sub pp_chroot { maybe_targmy(@_, \&unop, "chroot") }
6e90668e 1511sub pp_readlink { unop(@_, "readlink") }
3ed82cfc 1512sub pp_rmdir { maybe_targmy(@_, \&unop, "rmdir") }
6e90668e
SM
1513sub pp_readdir { unop(@_, "readdir") }
1514sub pp_telldir { unop(@_, "telldir") }
1515sub pp_rewinddir { unop(@_, "rewinddir") }
1516sub pp_closedir { unop(@_, "closedir") }
3ed82cfc 1517sub pp_getpgrp { maybe_targmy(@_, \&unop, "getpgrp") }
6e90668e
SM
1518sub pp_localtime { unop(@_, "localtime") }
1519sub pp_gmtime { unop(@_, "gmtime") }
1520sub pp_alarm { unop(@_, "alarm") }
3ed82cfc 1521sub pp_sleep { maybe_targmy(@_, \&unop, "sleep") }
6e90668e
SM
1522
1523sub pp_dofile { unop(@_, "do") }
1524sub pp_entereval { unop(@_, "eval") }
1525
1526sub pp_ghbyname { unop(@_, "gethostbyname") }
1527sub pp_gnbyname { unop(@_, "getnetbyname") }
1528sub pp_gpbyname { unop(@_, "getprotobyname") }
1529sub pp_shostent { unop(@_, "sethostent") }
1530sub pp_snetent { unop(@_, "setnetent") }
1531sub pp_sprotoent { unop(@_, "setprotoent") }
1532sub pp_sservent { unop(@_, "setservent") }
1533sub pp_gpwnam { unop(@_, "getpwnam") }
1534sub pp_gpwuid { unop(@_, "getpwuid") }
1535sub pp_ggrnam { unop(@_, "getgrnam") }
1536sub pp_ggrgid { unop(@_, "getgrgid") }
1537
1538sub pp_lock { unop(@_, "lock") }
1539
1540sub pp_exists {
1541 my $self = shift;
9d2c6865 1542 my($op, $cx) = @_;
34a48b4b
RH
1543 my $arg;
1544 if ($op->private & OPpEXISTS_SUB) {
1545 # Checking for the existence of a subroutine
1546 return $self->maybe_parens_func("exists",
1547 $self->pp_rv2cv($op->first, 16), $cx, 16);
1548 }
1549 if ($op->flags & OPf_SPECIAL) {
1550 # Array element, not hash element
1551 return $self->maybe_parens_func("exists",
1552 $self->pp_aelem($op->first, 16), $cx, 16);
1553 }
9d2c6865
SM
1554 return $self->maybe_parens_func("exists", $self->pp_helem($op->first, 16),
1555 $cx, 16);
6e90668e
SM
1556}
1557
6e90668e
SM
1558sub pp_delete {
1559 my $self = shift;
9d2c6865 1560 my($op, $cx) = @_;
6e90668e
SM
1561 my $arg;
1562 if ($op->private & OPpSLICE) {
34a48b4b
RH
1563 if ($op->flags & OPf_SPECIAL) {
1564 # Deleting from an array, not a hash
1565 return $self->maybe_parens_func("delete",
1566 $self->pp_aslice($op->first, 16),
1567 $cx, 16);
1568 }
9d2c6865
SM
1569 return $self->maybe_parens_func("delete",
1570 $self->pp_hslice($op->first, 16),
1571 $cx, 16);
6e90668e 1572 } else {
34a48b4b
RH
1573 if ($op->flags & OPf_SPECIAL) {
1574 # Deleting from an array, not a hash
1575 return $self->maybe_parens_func("delete",
1576 $self->pp_aelem($op->first, 16),
1577 $cx, 16);
1578 }
9d2c6865
SM
1579 return $self->maybe_parens_func("delete",
1580 $self->pp_helem($op->first, 16),
1581 $cx, 16);
6e90668e 1582 }
6e90668e
SM
1583}
1584
6e90668e
SM
1585sub pp_require {
1586 my $self = shift;
9d2c6865 1587 my($op, $cx) = @_;
3f872cb9 1588 if (class($op) eq "UNOP" and $op->first->name eq "const"
4c1f658f 1589 and $op->first->private & OPpCONST_BARE)
6e90668e 1590 {
18228111 1591 my $name = $self->const_sv($op->first)->PV;
6e90668e
SM
1592 $name =~ s[/][::]g;
1593 $name =~ s/\.pm//g;
34a48b4b 1594 return "require $name";
6e90668e 1595 } else {
9d2c6865 1596 $self->unop($op, $cx, "require");
6e90668e
SM
1597 }
1598}
1599
9d2c6865
SM
1600sub pp_scalar {
1601 my $self = shift;
1602 my($op, $cv) = @_;
1603 my $kid = $op->first;
1604 if (not null $kid->sibling) {
1605 # XXX Was a here-doc
1606 return $self->dquote($op);
1607 }
1608 $self->unop(@_, "scalar");
1609}
1610
1611
6e90668e
SM
1612sub padval {
1613 my $self = shift;
1614 my $targ = shift;
18228111 1615 #cluck "curcv was undef" unless $self->{curcv};
6e90668e
SM
1616 return (($self->{'curcv'}->PADLIST->ARRAY)[1]->ARRAY)[$targ];
1617}
1618
1619sub pp_refgen {
1620 my $self = shift;
9d2c6865 1621 my($op, $cx) = @_;
6e90668e 1622 my $kid = $op->first;
3f872cb9 1623 if ($kid->name eq "null") {
6e90668e 1624 $kid = $kid->first;
3f872cb9
GS
1625 if ($kid->name eq "anonlist" || $kid->name eq "anonhash") {
1626 my($pre, $post) = @{{"anonlist" => ["[","]"],
1627 "anonhash" => ["{","}"]}->{$kid->name}};
6e90668e
SM
1628 my($expr, @exprs);
1629 $kid = $kid->first->sibling; # skip pushmark
1630 for (; !null($kid); $kid = $kid->sibling) {
9d2c6865 1631 $expr = $self->deparse($kid, 6);
6e90668e
SM
1632 push @exprs, $expr;
1633 }
1634 return $pre . join(", ", @exprs) . $post;
1635 } elsif (!null($kid->sibling) and
3f872cb9 1636 $kid->sibling->name eq "anoncode") {
6e90668e
SM
1637 return "sub " .
1638 $self->deparse_sub($self->padval($kid->sibling->targ));
3f872cb9
GS
1639 } elsif ($kid->name eq "pushmark") {
1640 my $sib_name = $kid->sibling->name;
1641 if ($sib_name =~ /^(pad|rv2)[ah]v$/
c8c62db7
AD
1642 and not $kid->sibling->flags & OPf_REF)
1643 {
1644 # The @a in \(@a) isn't in ref context, but only when the
1645 # parens are there.
1646 return "\\(" . $self->deparse($kid->sibling, 1) . ")";
3f872cb9 1647 } elsif ($sib_name eq 'entersub') {
c8c62db7
AD
1648 my $text = $self->deparse($kid->sibling, 1);
1649 # Always show parens for \(&func()), but only with -p otherwise
1650 $text = "($text)" if $self->{'parens'}
1651 or $kid->sibling->private & OPpENTERSUB_AMPER;
1652 return "\\$text";
1653 }
1654 }
6e90668e 1655 }
9d2c6865 1656 $self->pfixop($op, $cx, "\\", 20);
6e90668e
SM
1657}
1658
1659sub pp_srefgen { pp_refgen(@_) }
1660
1661sub pp_readline {
1662 my $self = shift;
9d2c6865 1663 my($op, $cx) = @_;
6e90668e 1664 my $kid = $op->first;
3f872cb9 1665 $kid = $kid->first if $kid->name eq "rv2gv"; # <$fh>
e31885a0
RH
1666 return "<" . $self->deparse($kid, 1) . ">" if is_scalar($kid);
1667 return $self->unop($op, $cx, "readline");
6e90668e
SM
1668}
1669
ad8caead
RGS
1670sub pp_rcatline {
1671 my $self = shift;
1672 my($op) = @_;
1673 return "<" . $self->gv_name($op->gv) . ">";
1674}
1675
bd0865ec
GS
1676# Unary operators that can occur as pseudo-listops inside double quotes
1677sub dq_unop {
1678 my $self = shift;
1679 my($op, $cx, $name, $prec, $flags) = (@_, 0, 0);
1680 my $kid;
1681 if ($op->flags & OPf_KIDS) {
1682 $kid = $op->first;
1683 # If there's more than one kid, the first is an ex-pushmark.
1684 $kid = $kid->sibling if not null $kid->sibling;
1685 return $self->maybe_parens_unop($name, $kid, $cx);
1686 } else {
1687 return $name . ($op->flags & OPf_SPECIAL ? "()" : "");
1688 }
1689}
1690
1691sub pp_ucfirst { dq_unop(@_, "ucfirst") }
1692sub pp_lcfirst { dq_unop(@_, "lcfirst") }
1693sub pp_uc { dq_unop(@_, "uc") }
1694sub pp_lc { dq_unop(@_, "lc") }
3ed82cfc 1695sub pp_quotemeta { maybe_targmy(@_, \&dq_unop, "quotemeta") }
bd0865ec 1696
6e90668e
SM
1697sub loopex {
1698 my $self = shift;
9d2c6865 1699 my ($op, $cx, $name) = @_;
6e90668e 1700 if (class($op) eq "PVOP") {
9d2c6865
SM
1701 return "$name " . $op->pv;
1702 } elsif (class($op) eq "OP") {
1703 return $name;
6e90668e 1704 } elsif (class($op) eq "UNOP") {
9d2c6865
SM
1705 # Note -- loop exits are actually exempt from the
1706 # looks-like-a-func rule, but a few extra parens won't hurt
1707 return $self->maybe_parens_unop($name, $op->first, $cx);
6e90668e 1708 }
6e90668e
SM
1709}
1710
1711sub pp_last { loopex(@_, "last") }
1712sub pp_next { loopex(@_, "next") }
1713sub pp_redo { loopex(@_, "redo") }
1714sub pp_goto { loopex(@_, "goto") }
1715sub pp_dump { loopex(@_, "dump") }
1716
1717sub ftst {
1718 my $self = shift;
9d2c6865 1719 my($op, $cx, $name) = @_;
6e90668e 1720 if (class($op) eq "UNOP") {
9d2c6865
SM
1721 # Genuine `-X' filetests are exempt from the LLAFR, but not
1722 # l?stat(); for the sake of clarity, give'em all parens
1723 return $self->maybe_parens_unop($name, $op->first, $cx);
7934575e 1724 } elsif (class($op) eq "SVOP") {
9d2c6865 1725 return $self->maybe_parens_func($name, $self->pp_gv($op, 1), $cx, 16);
6e90668e 1726 } else { # I don't think baseop filetests ever survive ck_ftst, but...
9d2c6865 1727 return $name;
6e90668e 1728 }
6e90668e
SM
1729}
1730
1731sub pp_lstat { ftst(@_, "lstat") }
1732sub pp_stat { ftst(@_, "stat") }
1733sub pp_ftrread { ftst(@_, "-R") }
1734sub pp_ftrwrite { ftst(@_, "-W") }
1735sub pp_ftrexec { ftst(@_, "-X") }
1736sub pp_fteread { ftst(@_, "-r") }
e31885a0
RH
1737sub pp_ftewrite { ftst(@_, "-w") }
1738sub pp_fteexec { ftst(@_, "-x") }
6e90668e
SM
1739sub pp_ftis { ftst(@_, "-e") }
1740sub pp_fteowned { ftst(@_, "-O") }
1741sub pp_ftrowned { ftst(@_, "-o") }
1742sub pp_ftzero { ftst(@_, "-z") }
1743sub pp_ftsize { ftst(@_, "-s") }
1744sub pp_ftmtime { ftst(@_, "-M") }
1745sub pp_ftatime { ftst(@_, "-A") }
1746sub pp_ftctime { ftst(@_, "-C") }
1747sub pp_ftsock { ftst(@_, "-S") }
1748sub pp_ftchr { ftst(@_, "-c") }
1749sub pp_ftblk { ftst(@_, "-b") }
1750sub pp_ftfile { ftst(@_, "-f") }
1751sub pp_ftdir { ftst(@_, "-d") }
1752sub pp_ftpipe { ftst(@_, "-p") }
1753sub pp_ftlink { ftst(@_, "-l") }
1754sub pp_ftsuid { ftst(@_, "-u") }
1755sub pp_ftsgid { ftst(@_, "-g") }
1756sub pp_ftsvtx { ftst(@_, "-k") }
1757sub pp_fttty { ftst(@_, "-t") }
1758sub pp_fttext { ftst(@_, "-T") }
1759sub pp_ftbinary { ftst(@_, "-B") }
1760
a798dbf2 1761sub SWAP_CHILDREN () { 1 }
6e90668e 1762sub ASSIGN () { 2 } # has OP= variant
7013e6ae 1763sub LIST_CONTEXT () { 4 } # Assignment is in list context
6e90668e 1764
9d2c6865
SM
1765my(%left, %right);
1766
1767sub assoc_class {
1768 my $op = shift;
3f872cb9
GS
1769 my $name = $op->name;
1770 if ($name eq "concat" and $op->first->name eq "concat") {
9d2c6865 1771 # avoid spurious `=' -- see comment in pp_concat
3f872cb9 1772 return "concat";
9d2c6865 1773 }
3f872cb9
GS
1774 if ($name eq "null" and class($op) eq "UNOP"
1775 and $op->first->name =~ /^(and|x?or)$/
9d2c6865
SM
1776 and null $op->first->sibling)
1777 {
1778 # Like all conditional constructs, OP_ANDs and OP_ORs are topped
1779 # with a null that's used as the common end point of the two
1780 # flows of control. For precedence purposes, ignore it.
1781 # (COND_EXPRs have these too, but we don't bother with
1782 # their associativity).
1783 return assoc_class($op->first);
1784 }
1785 return $name . ($op->flags & OPf_STACKED ? "=" : "");
1786}
1787
1788# Left associative operators, like `+', for which
1789# $a + $b + $c is equivalent to ($a + $b) + $c
1790
1791BEGIN {
3f872cb9
GS
1792 %left = ('multiply' => 19, 'i_multiply' => 19,
1793 'divide' => 19, 'i_divide' => 19,
1794 'modulo' => 19, 'i_modulo' => 19,
1795 'repeat' => 19,
1796 'add' => 18, 'i_add' => 18,
1797 'subtract' => 18, 'i_subtract' => 18,
1798 'concat' => 18,
1799 'left_shift' => 17, 'right_shift' => 17,
1800 'bit_and' => 13,
1801 'bit_or' => 12, 'bit_xor' => 12,
1802 'and' => 3,
1803 'or' => 2, 'xor' => 2,
9d2c6865
SM
1804 );
1805}
1806
1807sub deparse_binop_left {
1808 my $self = shift;
1809 my($op, $left, $prec) = @_;
58231d39 1810 if ($left{assoc_class($op)} && $left{assoc_class($left)}
9d2c6865
SM
1811 and $left{assoc_class($op)} == $left{assoc_class($left)})
1812 {
1813 return $self->deparse($left, $prec - .00001);
1814 } else {
1815 return $self->deparse($left, $prec);
1816 }
1817}
1818
1819# Right associative operators, like `=', for which
1820# $a = $b = $c is equivalent to $a = ($b = $c)
1821
1822BEGIN {
3f872cb9
GS
1823 %right = ('pow' => 22,
1824 'sassign=' => 7, 'aassign=' => 7,
1825 'multiply=' => 7, 'i_multiply=' => 7,
1826 'divide=' => 7, 'i_divide=' => 7,
1827 'modulo=' => 7, 'i_modulo=' => 7,
1828 'repeat=' => 7,
1829 'add=' => 7, 'i_add=' => 7,
1830 'subtract=' => 7, 'i_subtract=' => 7,
1831 'concat=' => 7,
1832 'left_shift=' => 7, 'right_shift=' => 7,
1833 'bit_and=' => 7,
1834 'bit_or=' => 7, 'bit_xor=' => 7,
1835 'andassign' => 7,
1836 'orassign' => 7,
9d2c6865
SM
1837 );
1838}
1839
1840sub deparse_binop_right {
1841 my $self = shift;
1842 my($op, $right, $prec) = @_;
58231d39 1843 if ($right{assoc_class($op)} && $right{assoc_class($right)}
9d2c6865
SM
1844 and $right{assoc_class($op)} == $right{assoc_class($right)})
1845 {
1846 return $self->deparse($right, $prec - .00001);
1847 } else {
1848 return $self->deparse($right, $prec);
1849 }
1850}
1851
a798dbf2 1852sub binop {
6e90668e 1853 my $self = shift;
9d2c6865 1854 my ($op, $cx, $opname, $prec, $flags) = (@_, 0);
a798dbf2
MB
1855 my $left = $op->first;
1856 my $right = $op->last;
9d2c6865
SM
1857 my $eq = "";
1858 if ($op->flags & OPf_STACKED && $flags & ASSIGN) {
1859 $eq = "=";
1860 $prec = 7;
1861 }
a798dbf2
MB
1862 if ($flags & SWAP_CHILDREN) {
1863 ($left, $right) = ($right, $left);
1864 }
9d2c6865 1865 $left = $self->deparse_binop_left($op, $left, $prec);
90c0eb26
RH
1866 $left = "($left)" if $flags & LIST_CONTEXT
1867 && $left !~ /^(my|our|local|)[\@\(]/;
9d2c6865
SM
1868 $right = $self->deparse_binop_right($op, $right, $prec);
1869 return $self->maybe_parens("$left $opname$eq $right", $cx, $prec);
1870}
1871
3ed82cfc
GS
1872sub pp_add { maybe_targmy(@_, \&binop, "+", 18, ASSIGN) }
1873sub pp_multiply { maybe_targmy(@_, \&binop, "*", 19, ASSIGN) }
1874sub pp_subtract { maybe_targmy(@_, \&binop, "-",18, ASSIGN) }
1875sub pp_divide { maybe_targmy(@_, \&binop, "/", 19, ASSIGN) }
1876sub pp_modulo { maybe_targmy(@_, \&binop, "%", 19, ASSIGN) }
1877sub pp_i_add { maybe_targmy(@_, \&binop, "+", 18, ASSIGN) }
1878sub pp_i_multiply { maybe_targmy(@_, \&binop, "*", 19, ASSIGN) }
1879sub pp_i_subtract { maybe_targmy(@_, \&binop, "-", 18, ASSIGN) }
1880sub pp_i_divide { maybe_targmy(@_, \&binop, "/", 19, ASSIGN) }
1881sub pp_i_modulo { maybe_targmy(@_, \&binop, "%", 19, ASSIGN) }
1882sub pp_pow { maybe_targmy(@_, \&binop, "**", 22, ASSIGN) }
1883
1884sub pp_left_shift { maybe_targmy(@_, \&binop, "<<", 17, ASSIGN) }
1885sub pp_right_shift { maybe_targmy(@_, \&binop, ">>", 17, ASSIGN) }
1886sub pp_bit_and { maybe_targmy(@_, \&binop, "&", 13, ASSIGN) }
1887sub pp_bit_or { maybe_targmy(@_, \&binop, "|", 12, ASSIGN) }
1888sub pp_bit_xor { maybe_targmy(@_, \&binop, "^", 12, ASSIGN) }
9d2c6865
SM
1889
1890sub pp_eq { binop(@_, "==", 14) }
1891sub pp_ne { binop(@_, "!=", 14) }
1892sub pp_lt { binop(@_, "<", 15) }
1893sub pp_gt { binop(@_, ">", 15) }
1894sub pp_ge { binop(@_, ">=", 15) }
1895sub pp_le { binop(@_, "<=", 15) }
1896sub pp_ncmp { binop(@_, "<=>", 14) }
1897sub pp_i_eq { binop(@_, "==", 14) }
1898sub pp_i_ne { binop(@_, "!=", 14) }
1899sub pp_i_lt { binop(@_, "<", 15) }
1900sub pp_i_gt { binop(@_, ">", 15) }
1901sub pp_i_ge { binop(@_, ">=", 15) }
1902sub pp_i_le { binop(@_, "<=", 15) }
1903sub pp_i_ncmp { binop(@_, "<=>", 14) }
1904
1905sub pp_seq { binop(@_, "eq", 14) }
1906sub pp_sne { binop(@_, "ne", 14) }
1907sub pp_slt { binop(@_, "lt", 15) }
1908sub pp_sgt { binop(@_, "gt", 15) }
1909sub pp_sge { binop(@_, "ge", 15) }
1910sub pp_sle { binop(@_, "le", 15) }
1911sub pp_scmp { binop(@_, "cmp", 14) }
1912
1913sub pp_sassign { binop(@_, "=", 7, SWAP_CHILDREN) }
7013e6ae 1914sub pp_aassign { binop(@_, "=", 7, SWAP_CHILDREN | LIST_CONTEXT) }
6e90668e
SM
1915
1916# `.' is special because concats-of-concats are optimized to save copying
1917# by making all but the first concat stacked. The effect is as if the
1918# programmer had written `($a . $b) .= $c', except legal.
3ed82cfc
GS
1919sub pp_concat { maybe_targmy(@_, \&real_concat) }
1920sub real_concat {
6e90668e 1921 my $self = shift;
9d2c6865 1922 my($op, $cx) = @_;
6e90668e
SM
1923 my $left = $op->first;
1924 my $right = $op->last;
1925 my $eq = "";
9d2c6865 1926 my $prec = 18;
3f872cb9 1927 if ($op->flags & OPf_STACKED and $op->first->name ne "concat") {
6e90668e 1928 $eq = "=";
9d2c6865 1929 $prec = 7;
6e90668e 1930 }
9d2c6865
SM
1931 $left = $self->deparse_binop_left($op, $left, $prec);
1932 $right = $self->deparse_binop_right($op, $right, $prec);
1933 return $self->maybe_parens("$left .$eq $right", $cx, $prec);
6e90668e
SM
1934}
1935
1936# `x' is weird when the left arg is a list
1937sub pp_repeat {
1938 my $self = shift;
9d2c6865 1939 my($op, $cx) = @_;
6e90668e
SM
1940 my $left = $op->first;
1941 my $right = $op->last;
9d2c6865
SM
1942 my $eq = "";
1943 my $prec = 19;
1944 if ($op->flags & OPf_STACKED) {
1945 $eq = "=";
1946 $prec = 7;
1947 }
6e90668e
SM
1948 if (null($right)) { # list repeat; count is inside left-side ex-list
1949 my $kid = $left->first->sibling; # skip pushmark
1950 my @exprs;
1951 for (; !null($kid->sibling); $kid = $kid->sibling) {
9d2c6865 1952 push @exprs, $self->deparse($kid, 6);
6e90668e
SM
1953 }
1954 $right = $kid;
1955 $left = "(" . join(", ", @exprs). ")";
1956 } else {
9d2c6865 1957 $left = $self->deparse_binop_left($op, $left, $prec);
6e90668e 1958 }
9d2c6865
SM
1959 $right = $self->deparse_binop_right($op, $right, $prec);
1960 return $self->maybe_parens("$left x$eq $right", $cx, $prec);
6e90668e
SM
1961}
1962
1963sub range {
1964 my $self = shift;
9d2c6865 1965 my ($op, $cx, $type) = @_;
6e90668e
SM
1966 my $left = $op->first;
1967 my $right = $left->sibling;
9d2c6865
SM
1968 $left = $self->deparse($left, 9);
1969 $right = $self->deparse($right, 9);
1970 return $self->maybe_parens("$left $type $right", $cx, 9);
6e90668e
SM
1971}
1972
1973sub pp_flop {
1974 my $self = shift;
9d2c6865 1975 my($op, $cx) = @_;
6e90668e
SM
1976 my $flip = $op->first;
1977 my $type = ($flip->flags & OPf_SPECIAL) ? "..." : "..";
9d2c6865 1978 return $self->range($flip->first, $cx, $type);
6e90668e
SM
1979}
1980
1981# one-line while/until is handled in pp_leave
1982
1983sub logop {
1984 my $self = shift;
9d2c6865 1985 my ($op, $cx, $lowop, $lowprec, $highop, $highprec, $blockname) = @_;
6e90668e
SM
1986 my $left = $op->first;
1987 my $right = $op->first->sibling;
58cccf98
SM
1988 if ($cx == 0 and is_scope($right) and $blockname
1989 and $self->{'expand'} < 7)
1990 { # if ($a) {$b}
9d2c6865
SM
1991 $left = $self->deparse($left, 1);
1992 $right = $self->deparse($right, 0);
1993 return "$blockname ($left) {\n\t$right\n\b}\cK";
58cccf98
SM
1994 } elsif ($cx == 0 and $blockname and not $self->{'parens'}
1995 and $self->{'expand'} < 7) { # $b if $a
9d2c6865
SM
1996 $right = $self->deparse($right, 1);
1997 $left = $self->deparse($left, 1);
1998 return "$right $blockname $left";
1999 } elsif ($cx > $lowprec and $highop) { # $a && $b
2000 $left = $self->deparse_binop_left($op, $left, $highprec);
2001 $right = $self->deparse_binop_right($op, $right, $highprec);
2002 return $self->maybe_parens("$left $highop $right", $cx, $highprec);
2003 } else { # $a and $b
2004 $left = $self->deparse_binop_left($op, $left, $lowprec);
2005 $right = $self->deparse_binop_right($op, $right, $lowprec);
2006 return $self->maybe_parens("$left $lowop $right", $cx, $lowprec);
2007 }
2008}
2009
2010sub pp_and { logop(@_, "and", 3, "&&", 11, "if") }
f4a44678 2011sub pp_or { logop(@_, "or", 2, "||", 10, "unless") }
3ed82cfc
GS
2012
2013# xor is syntactically a logop, but it's really a binop (contrary to
2014# old versions of opcode.pl). Syntax is what matters here.
9d2c6865 2015sub pp_xor { logop(@_, "xor", 2, "", 0, "") }
6e90668e
SM
2016
2017sub logassignop {
2018 my $self = shift;
9d2c6865 2019 my ($op, $cx, $opname) = @_;
6e90668e
SM
2020 my $left = $op->first;
2021 my $right = $op->first->sibling->first; # skip sassign
9d2c6865
SM
2022 $left = $self->deparse($left, 7);
2023 $right = $self->deparse($right, 7);
2024 return $self->maybe_parens("$left $opname $right", $cx, 7);
a798dbf2
MB
2025}
2026
6e90668e
SM
2027sub pp_andassign { logassignop(@_, "&&=") }
2028sub pp_orassign { logassignop(@_, "||=") }
2029
2030sub listop {
2031 my $self = shift;
9d2c6865
SM
2032 my($op, $cx, $name) = @_;
2033 my(@exprs);
2034 my $parens = ($cx >= 5) || $self->{'parens'};
2035 my $kid = $op->first->sibling;
2036 return $name if null $kid;
e31885a0
RH
2037 my $first;
2038 if (defined prototype("CORE::$name")
2039 && prototype("CORE::$name") =~ /^;?\*/
2040 && $kid->name eq "rv2gv") {
2041 $first = $self->deparse($kid->first, 6);
2042 }
2043 else {
2044 $first = $self->deparse($kid, 6);
2045 }
e99ebc55 2046 if ($name eq "chmod" && $first =~ /^\d+$/) {
a0035eb8 2047 $first = sprintf("%#o", $first);
e99ebc55 2048 }
9d2c6865
SM
2049 $first = "+$first" if not $parens and substr($first, 0, 1) eq "(";
2050 push @exprs, $first;
2051 $kid = $kid->sibling;
2052 for (; !null($kid); $kid = $kid->sibling) {
2053 push @exprs, $self->deparse($kid, 6);
2054 }
2055 if ($parens) {
2056 return "$name(" . join(", ", @exprs) . ")";
2057 } else {
2058 return "$name " . join(", ", @exprs);
6e90668e 2059 }
6e90668e 2060}
a798dbf2 2061
6e90668e 2062sub pp_bless { listop(@_, "bless") }
3ed82cfc 2063sub pp_atan2 { maybe_targmy(@_, \&listop, "atan2") }
6e90668e
SM
2064sub pp_substr { maybe_local(@_, listop(@_, "substr")) }
2065sub pp_vec { maybe_local(@_, listop(@_, "vec")) }
3ed82cfc
GS
2066sub pp_index { maybe_targmy(@_, \&listop, "index") }
2067sub pp_rindex { maybe_targmy(@_, \&listop, "rindex") }
2068sub pp_sprintf { maybe_targmy(@_, \&listop, "sprintf") }
6e90668e 2069sub pp_formline { listop(@_, "formline") } # see also deparse_format
3ed82cfc 2070sub pp_crypt { maybe_targmy(@_, \&listop, "crypt") }
6e90668e
SM
2071sub pp_unpack { listop(@_, "unpack") }
2072sub pp_pack { listop(@_, "pack") }
3ed82cfc 2073sub pp_join { maybe_targmy(@_, \&listop, "join") }
6e90668e 2074sub pp_splice { listop(@_, "splice") }
3ed82cfc
GS
2075sub pp_push { maybe_targmy(@_, \&listop, "push") }
2076sub pp_unshift { maybe_targmy(@_, \&listop, "unshift") }
6e90668e
SM
2077sub pp_reverse { listop(@_, "reverse") }
2078sub pp_warn { listop(@_, "warn") }
2079sub pp_die { listop(@_, "die") }
9d2c6865
SM
2080# Actually, return is exempt from the LLAFR (see examples in this very
2081# module!), but for consistency's sake, ignore that fact
6e90668e
SM
2082sub pp_return { listop(@_, "return") }
2083sub pp_open { listop(@_, "open") }
2084sub pp_pipe_op { listop(@_, "pipe") }
2085sub pp_tie { listop(@_, "tie") }
82bafd27 2086sub pp_binmode { listop(@_, "binmode") }
6e90668e
SM
2087sub pp_dbmopen { listop(@_, "dbmopen") }
2088sub pp_sselect { listop(@_, "select") }
2089sub pp_select { listop(@_, "select") }
2090sub pp_read { listop(@_, "read") }
2091sub pp_sysopen { listop(@_, "sysopen") }
2092sub pp_sysseek { listop(@_, "sysseek") }
2093sub pp_sysread { listop(@_, "sysread") }
2094sub pp_syswrite { listop(@_, "syswrite") }
2095sub pp_send { listop(@_, "send") }
2096sub pp_recv { listop(@_, "recv") }
2097sub pp_seek { listop(@_, "seek") }
6e90668e
SM
2098sub pp_fcntl { listop(@_, "fcntl") }
2099sub pp_ioctl { listop(@_, "ioctl") }
3ed82cfc 2100sub pp_flock { maybe_targmy(@_, \&listop, "flock") }
6e90668e
SM
2101sub pp_socket { listop(@_, "socket") }
2102sub pp_sockpair { listop(@_, "sockpair") }
2103sub pp_bind { listop(@_, "bind") }
2104sub pp_connect { listop(@_, "connect") }
2105sub pp_listen { listop(@_, "listen") }
2106sub pp_accept { listop(@_, "accept") }
2107sub pp_shutdown { listop(@_, "shutdown") }
2108sub pp_gsockopt { listop(@_, "getsockopt") }
2109sub pp_ssockopt { listop(@_, "setsockopt") }
3ed82cfc
GS
2110sub pp_chown { maybe_targmy(@_, \&listop, "chown") }
2111sub pp_unlink { maybe_targmy(@_, \&listop, "unlink") }
2112sub pp_chmod { maybe_targmy(@_, \&listop, "chmod") }
2113sub pp_utime { maybe_targmy(@_, \&listop, "utime") }
2114sub pp_rename { maybe_targmy(@_, \&listop, "rename") }
2115sub pp_link { maybe_targmy(@_, \&listop, "link") }
2116sub pp_symlink { maybe_targmy(@_, \&listop, "symlink") }
2117sub pp_mkdir { maybe_targmy(@_, \&listop, "mkdir") }
6e90668e
SM
2118sub pp_open_dir { listop(@_, "opendir") }
2119sub pp_seekdir { listop(@_, "seekdir") }
3ed82cfc
GS
2120sub pp_waitpid { maybe_targmy(@_, \&listop, "waitpid") }
2121sub pp_system { maybe_targmy(@_, \&listop, "system") }
2122sub pp_exec { maybe_targmy(@_, \&listop, "exec") }
2123sub pp_kill { maybe_targmy(@_, \&listop, "kill") }
2124sub pp_setpgrp { maybe_targmy(@_, \&listop, "setpgrp") }
2125sub pp_getpriority { maybe_targmy(@_, \&listop, "getpriority") }
2126sub pp_setpriority { maybe_targmy(@_, \&listop, "setpriority") }
6e90668e
SM
2127sub pp_shmget { listop(@_, "shmget") }
2128sub pp_shmctl { listop(@_, "shmctl") }
2129sub pp_shmread { listop(@_, "shmread") }
2130sub pp_shmwrite { listop(@_, "shmwrite") }
2131sub pp_msgget { listop(@_, "msgget") }
2132sub pp_msgctl { listop(@_, "msgctl") }
2133sub pp_msgsnd { listop(@_, "msgsnd") }
2134sub pp_msgrcv { listop(@_, "msgrcv") }
2135sub pp_semget { listop(@_, "semget") }
2136sub pp_semctl { listop(@_, "semctl") }
2137sub pp_semop { listop(@_, "semop") }
2138sub pp_ghbyaddr { listop(@_, "gethostbyaddr") }
2139sub pp_gnbyaddr { listop(@_, "getnetbyaddr") }
2140sub pp_gpbynumber { listop(@_, "getprotobynumber") }
2141sub pp_gsbyname { listop(@_, "getservbyname") }
2142sub pp_gsbyport { listop(@_, "getservbyport") }
2143sub pp_syscall { listop(@_, "syscall") }
2144
2145sub pp_glob {
2146 my $self = shift;
9d2c6865 2147 my($op, $cx) = @_;
6e90668e
SM
2148 my $text = $self->dq($op->first->sibling); # skip pushmark
2149 if ($text =~ /^\$?(\w|::|\`)+$/ # could look like a readline
2150 or $text =~ /[<>]/) {
2151 return 'glob(' . single_delim('qq', '"', $text) . ')';
2152 } else {
2153 return '<' . $text . '>';
2154 }
2155}
2156
f5aa8f4e
SM
2157# Truncate is special because OPf_SPECIAL makes a bareword first arg
2158# be a filehandle. This could probably be better fixed in the core
2159# by moving the GV lookup into ck_truc.
2160
2161sub pp_truncate {
2162 my $self = shift;
2163 my($op, $cx) = @_;
2164 my(@exprs);
2165 my $parens = ($cx >= 5) || $self->{'parens'};
2166 my $kid = $op->first->sibling;
acba1d67 2167 my $fh;
f5aa8f4e
SM
2168 if ($op->flags & OPf_SPECIAL) {
2169 # $kid is an OP_CONST
18228111 2170 $fh = $self->const_sv($kid)->PV;
f5aa8f4e
SM
2171 } else {
2172 $fh = $self->deparse($kid, 6);
2173 $fh = "+$fh" if not $parens and substr($fh, 0, 1) eq "(";
2174 }
2175 my $len = $self->deparse($kid->sibling, 6);
2176 if ($parens) {
2177 return "truncate($fh, $len)";
2178 } else {
2179 return "truncate $fh, $len";
2180 }
f5aa8f4e
SM
2181}
2182
6e90668e
SM
2183sub indirop {
2184 my $self = shift;
9d2c6865 2185 my($op, $cx, $name) = @_;
6e90668e
SM
2186 my($expr, @exprs);
2187 my $kid = $op->first->sibling;
2188 my $indir = "";
2189 if ($op->flags & OPf_STACKED) {
2190 $indir = $kid;
2191 $indir = $indir->first; # skip rv2gv
2192 if (is_scope($indir)) {
9d2c6865 2193 $indir = "{" . $self->deparse($indir, 0) . "}";
c73811ab
RH
2194 } elsif ($indir->name eq "const" && $indir->private & OPpCONST_BARE) {
2195 $indir = $self->const_sv($indir)->PV;
6e90668e 2196 } else {
9d2c6865 2197 $indir = $self->deparse($indir, 24);
6e90668e
SM
2198 }
2199 $indir = $indir . " ";
2200 $kid = $kid->sibling;
2201 }
7e80da18
RH
2202 if ($name eq "sort" && $op->private & (OPpSORT_NUMERIC | OPpSORT_INTEGER)) {
2203 $indir = ($op->private & OPpSORT_REVERSE) ? '{$b <=> $a} '
2204 : '{$a <=> $b} ';
2205 }
2206 elsif ($name eq "sort" && $op->private & OPpSORT_REVERSE) {
2207 $indir = '{$b cmp $a} ';
2208 }
6e90668e 2209 for (; !null($kid); $kid = $kid->sibling) {
9d2c6865 2210 $expr = $self->deparse($kid, 6);
6e90668e
SM
2211 push @exprs, $expr;
2212 }
3ed82cfc 2213 return $self->maybe_parens_func($name, $indir . join(", ", @exprs),
9d2c6865 2214 $cx, 5);
6e90668e
SM
2215}
2216
2217sub pp_prtf { indirop(@_, "printf") }
2218sub pp_print { indirop(@_, "print") }
2219sub pp_sort { indirop(@_, "sort") }
2220
2221sub mapop {
2222 my $self = shift;
9d2c6865 2223 my($op, $cx, $name) = @_;
6e90668e
SM
2224 my($expr, @exprs);
2225 my $kid = $op->first; # this is the (map|grep)start
2226 $kid = $kid->first->sibling; # skip a pushmark
2227 my $code = $kid->first; # skip a null
2228 if (is_scope $code) {
f4a44678 2229 $code = "{" . $self->deparse($code, 0) . "} ";
6e90668e 2230 } else {
9d2c6865 2231 $code = $self->deparse($code, 24) . ", ";
6e90668e
SM
2232 }
2233 $kid = $kid->sibling;
2234 for (; !null($kid); $kid = $kid->sibling) {
9d2c6865 2235 $expr = $self->deparse($kid, 6);
6e90668e
SM
2236 push @exprs, $expr if $expr;
2237 }
9d2c6865 2238 return $self->maybe_parens_func($name, $code . join(", ", @exprs), $cx, 5);
6e90668e
SM
2239}
2240
2241sub pp_mapwhile { mapop(@_, "map") }
2242sub pp_grepwhile { mapop(@_, "grep") }
2243
2244sub pp_list {
2245 my $self = shift;
9d2c6865 2246 my($op, $cx) = @_;
6e90668e
SM
2247 my($expr, @exprs);
2248 my $kid = $op->first->sibling; # skip pushmark
2249 my $lop;
ce4e655d 2250 my $local = "either"; # could be local(...), my(...) or our(...)
6e90668e
SM
2251 for ($lop = $kid; !null($lop); $lop = $lop->sibling) {
2252 # This assumes that no other private flags equal 128, and that
2253 # OPs that store things other than flags in their op_private,
2254 # like OP_AELEMFAST, won't be immediate children of a list.
b8e103fc
RH
2255 #
2256 # OP_ENTERSUB can break this logic, so check for it.
2257 # I suspect that open and exit can too.
2258
2259 if (!($lop->private & (OPpLVAL_INTRO|OPpOUR_INTRO)
ce4e655d 2260 or $lop->name eq "undef")
b8e103fc
RH
2261 or $lop->name eq "entersub"
2262 or $lop->name eq "exit"
2263 or $lop->name eq "open")
6e90668e
SM
2264 {
2265 $local = ""; # or not
2266 last;
2267 }
3f872cb9 2268 if ($lop->name =~ /^pad[ash]v$/) { # my()
ce4e655d 2269 ($local = "", last) if $local eq "local" || $local eq "our";
6e90668e 2270 $local = "my";
b8e103fc
RH
2271 } elsif ($lop->name =~ /^(gv|rv2)[ash]v$/
2272 && $lop->private & OPpOUR_INTRO
2273 or $lop->name eq "null" && $lop->first->name eq "gvsv"
2274 && $lop->first->private & OPpOUR_INTRO) { # our()
ce4e655d
RH
2275 ($local = "", last) if $local eq "my" || $local eq "local";
2276 $local = "our";
3f872cb9 2277 } elsif ($lop->name ne "undef") { # local()
ce4e655d 2278 ($local = "", last) if $local eq "my" || $local eq "our";
6e90668e
SM
2279 $local = "local";
2280 }
2281 }
2282 $local = "" if $local eq "either"; # no point if it's all undefs
f5aa8f4e 2283 return $self->deparse($kid, $cx) if null $kid->sibling and not $local;
6e90668e
SM
2284 for (; !null($kid); $kid = $kid->sibling) {
2285 if ($local) {
3f872cb9 2286 if (class($kid) eq "UNOP" and $kid->first->name eq "gvsv") {
6e90668e
SM
2287 $lop = $kid->first;
2288 } else {
2289 $lop = $kid;
2290 }
2291 $self->{'avoid_local'}{$$lop}++;
9d2c6865 2292 $expr = $self->deparse($kid, 6);
6e90668e
SM
2293 delete $self->{'avoid_local'}{$$lop};
2294 } else {
9d2c6865 2295 $expr = $self->deparse($kid, 6);
6e90668e
SM
2296 }
2297 push @exprs, $expr;
2298 }
9d2c6865
SM
2299 if ($local) {
2300 return "$local(" . join(", ", @exprs) . ")";
2301 } else {
2302 return $self->maybe_parens( join(", ", @exprs), $cx, 6);
2303 }
6e90668e
SM
2304}
2305
6f611a1a
GS
2306sub is_ifelse_cont {
2307 my $op = shift;
2308 return ($op->name eq "null" and class($op) eq "UNOP"
2309 and $op->first->name =~ /^(and|cond_expr)$/
2310 and is_scope($op->first->first->sibling));
2311}
2312
6e90668e
SM
2313sub pp_cond_expr {
2314 my $self = shift;
9d2c6865 2315 my($op, $cx) = @_;
6e90668e
SM
2316 my $cond = $op->first;
2317 my $true = $cond->sibling;
2318 my $false = $true->sibling;
9d2c6865 2319 my $cuddle = $self->{'cuddle'};
6f611a1a 2320 unless ($cx == 0 and (is_scope($true) and $true->name ne "null") and
58cccf98
SM
2321 (is_scope($false) || is_ifelse_cont($false))
2322 and $self->{'expand'} < 7) {
f5aa8f4e 2323 $cond = $self->deparse($cond, 8);
9d2c6865
SM
2324 $true = $self->deparse($true, 8);
2325 $false = $self->deparse($false, 8);
2326 return $self->maybe_parens("$cond ? $true : $false", $cx, 8);
6f611a1a
GS
2327 }
2328
f5aa8f4e 2329 $cond = $self->deparse($cond, 1);
9d2c6865 2330 $true = $self->deparse($true, 0);
6f611a1a
GS
2331 my $head = "if ($cond) {\n\t$true\n\b}";
2332 my @elsifs;
2333 while (!null($false) and is_ifelse_cont($false)) {
2334 my $newop = $false->first;
2335 my $newcond = $newop->first;
2336 my $newtrue = $newcond->sibling;
2337 $false = $newtrue->sibling; # last in chain is OP_AND => no else
2338 $newcond = $self->deparse($newcond, 1);
2339 $newtrue = $self->deparse($newtrue, 0);
2340 push @elsifs, "elsif ($newcond) {\n\t$newtrue\n\b}";
2341 }
2342 if (!null($false)) {
2343 $false = $cuddle . "else {\n\t" .
2344 $self->deparse($false, 0) . "\n\b}\cK";
2345 } else {
2346 $false = "\cK";
6e90668e 2347 }
6f611a1a 2348 return $head . join($cuddle, "", @elsifs) . $false;
6e90668e
SM
2349}
2350
58cccf98 2351sub loop_common {
6e90668e 2352 my $self = shift;
58cccf98 2353 my($op, $cx, $init) = @_;
6e90668e
SM
2354 my $enter = $op->first;
2355 my $kid = $enter->sibling;
a0405c92
RH
2356 local(@$self{qw'curstash warnings hints'})
2357 = @$self{qw'curstash warnings hints'};
6e90668e 2358 my $head = "";
9d2c6865 2359 my $bare = 0;
58cccf98
SM
2360 my $body;
2361 my $cond = undef;
3f872cb9 2362 if ($kid->name eq "lineseq") { # bare or infinite loop
6e90668e 2363 if (is_state $kid->last) { # infinite
e99ebc55 2364 $head = "while (1) "; # Can't use for(;;) if there's a continue
58cccf98 2365 $cond = "";
9d2c6865
SM
2366 } else {
2367 $bare = 1;
6e90668e 2368 }
58cccf98 2369 $body = $kid;
3f872cb9 2370 } elsif ($enter->name eq "enteriter") { # foreach
6e90668e
SM
2371 my $ary = $enter->first->sibling; # first was pushmark
2372 my $var = $ary->sibling;
f5aa8f4e
SM
2373 if ($enter->flags & OPf_STACKED
2374 and not null $ary->first->sibling->sibling)
2375 {
d7f5b6da
SM
2376 $ary = $self->deparse($ary->first->sibling, 9) . " .. " .
2377 $self->deparse($ary->first->sibling->sibling, 9);
d8d95777
GA
2378 } else {
2379 $ary = $self->deparse($ary, 1);
2380 }
6e90668e 2381 if (null $var) {
f6f9bdb7 2382 if ($enter->flags & OPf_SPECIAL) { # thread special var
9d2c6865 2383 $var = $self->pp_threadsv($enter, 1);
f6f9bdb7 2384 } else { # regular my() variable
9d2c6865 2385 $var = $self->pp_padsv($enter, 1);
f6f9bdb7
SM
2386 if ($self->padname_sv($enter->targ)->IVX ==
2387 $kid->first->first->sibling->last->cop_seq)
2388 {
2389 # If the scope of this variable closes at the last
2390 # statement of the loop, it must have been
2391 # declared here.
2392 $var = "my " . $var;
2393 }
6e90668e 2394 }
3f872cb9 2395 } elsif ($var->name eq "rv2gv") {
9d2c6865 2396 $var = $self->pp_rv2sv($var, 1);
3f872cb9 2397 } elsif ($var->name eq "gv") {
9d2c6865 2398 $var = "\$" . $self->deparse($var, 1);
6e90668e 2399 }
9d2c6865 2400 $head = "foreach $var ($ary) ";
58cccf98 2401 $body = $kid->first->first->sibling; # skip OP_AND and OP_ITER
3f872cb9 2402 } elsif ($kid->name eq "null") { # while/until
6e90668e 2403 $kid = $kid->first;
58cccf98
SM
2404 my $name = {"and" => "while", "or" => "until"}->{$kid->name};
2405 $cond = $self->deparse($kid->first, 1);
2406 $head = "$name ($cond) ";
2407 $body = $kid->first->sibling;
3f872cb9 2408 } elsif ($kid->name eq "stub") { # bare and empty
9d2c6865 2409 return "{;}"; # {} could be a hashref
6e90668e 2410 }
58cccf98
SM
2411 # If there isn't a continue block, then the next pointer for the loop
2412 # will point to the unstack, which is kid's penultimate child, except
2413 # in a bare loop, when it will point to the leaveloop. When neither of
2414 # these conditions hold, then the third-to-last child in the continue
2415 # block (or the last in a bare loop).
2416 my $cont_start = $enter->nextop;
2417 my $cont;
c73811ab 2418 if ($$cont_start != $$op && ${$cont_start->sibling} != ${$body->last}) {
58cccf98
SM
2419 if ($bare) {
2420 $cont = $body->last;
2421 } else {
2422 $cont = $body->first;
2423 while (!null($cont->sibling->sibling->sibling)) {
2424 $cont = $cont->sibling;
2425 }
2426 }
2427 my $state = $body->first;
2428 my $cuddle = $self->{'cuddle'};
2429 my @states;
2430 for (; $$state != $$cont; $state = $state->sibling) {
2431 push @states, $state;
2432 }
ce4e655d 2433 $body = $self->lineseq(undef, @states);
58cccf98
SM
2434 if (defined $cond and not is_scope $cont and $self->{'expand'} < 3) {
2435 $head = "for ($init; $cond; " . $self->deparse($cont, 1) .") ";
2436 $cont = "\cK";
2437 } else {
2438 $cont = $cuddle . "continue {\n\t" .
2439 $self->deparse($cont, 0) . "\n\b}\cK";
6e90668e 2440 }
6e90668e 2441 } else {
7a9b44b9 2442 return "" if !defined $body;
c73811ab
RH
2443 if (length $init) {
2444 $head = "for ($init; $cond;) ";
2445 }
9d2c6865 2446 $cont = "\cK";
58cccf98 2447 $body = $self->deparse($body, 0);
6e90668e 2448 }
ce4e655d 2449 $body =~ s/;?$/;\n/;
34a48b4b
RH
2450
2451 return $head . "{\n\t" . $body . "\b}" . $cont;
58cccf98
SM
2452}
2453
2454sub pp_leaveloop { loop_common(@_, "") }
2455
2456sub for_loop {
2457 my $self = shift;
2458 my($op, $cx) = @_;
2459 my $init = $self->deparse($op, 1);
c73811ab 2460 return $self->loop_common($op->sibling->first->sibling, $cx, $init);
6e90668e
SM
2461}
2462
2463sub pp_leavetry {
2464 my $self = shift;
9d2c6865 2465 return "eval {\n\t" . $self->pp_leave(@_) . "\n\b}";
bd0865ec 2466}
6e90668e 2467
bd0865ec
GS
2468BEGIN { eval "sub OP_CONST () {" . opnumber("const") . "}" }
2469BEGIN { eval "sub OP_STRINGIFY () {" . opnumber("stringify") . "}" }
a9760014 2470BEGIN { eval "sub OP_RV2SV () {" . opnumber("rv2sv") . "}" }
90c0eb26 2471BEGIN { eval "sub OP_LIST () {" . opnumber("list") . "}" }
f5aa8f4e 2472
a798dbf2 2473sub pp_null {
6e90668e 2474 my $self = shift;
9d2c6865 2475 my($op, $cx) = @_;
6e90668e 2476 if (class($op) eq "OP") {
f4a44678
SM
2477 # old value is lost
2478 return $self->{'ex_const'} if $op->targ == OP_CONST;
3f872cb9 2479 } elsif ($op->first->name eq "pushmark") {
9d2c6865 2480 return $self->pp_list($op, $cx);
3f872cb9 2481 } elsif ($op->first->name eq "enter") {
9d2c6865 2482 return $self->pp_leave($op, $cx);
bd0865ec 2483 } elsif ($op->targ == OP_STRINGIFY) {
6f611a1a 2484 return $self->dquote($op, $cx);
6e90668e 2485 } elsif (!null($op->first->sibling) and
3f872cb9 2486 $op->first->sibling->name eq "readline" and
6e90668e 2487 $op->first->sibling->flags & OPf_STACKED) {
9d2c6865
SM
2488 return $self->maybe_parens($self->deparse($op->first, 7) . " = "
2489 . $self->deparse($op->first->sibling, 7),
2490 $cx, 7);
6e90668e 2491 } elsif (!null($op->first->sibling) and
3f872cb9 2492 $op->first->sibling->name eq "trans" and
6e90668e 2493 $op->first->sibling->flags & OPf_STACKED) {
9d2c6865
SM
2494 return $self->maybe_parens($self->deparse($op->first, 20) . " =~ "
2495 . $self->deparse($op->first->sibling, 20),
2496 $cx, 20);
c102638c
RH
2497 } elsif ($op->flags & OPf_SPECIAL && $cx == 0 && !$op->targ) {
2498 return "do {\n\t". $self->deparse($op->first, $cx) ."\n\b};";
ad8caead
RGS
2499 } elsif (!null($op->first->sibling) and
2500 $op->first->sibling->name eq "null" and
2501 class($op->first->sibling) eq "UNOP" and
2502 $op->first->sibling->first->flags & OPf_STACKED and
2503 $op->first->sibling->first->name eq "rcatline") {
2504 return $self->maybe_parens($self->deparse($op->first, 18) . " .= "
2505 . $self->deparse($op->first->sibling, 18),
2506 $cx, 18);
6e90668e 2507 } else {
9d2c6865 2508 return $self->deparse($op->first, $cx);
6e90668e 2509 }
a798dbf2
MB
2510}
2511
6e90668e
SM
2512sub padname {
2513 my $self = shift;
2514 my $targ = shift;
68223ea3 2515 return $self->padname_sv($targ)->PVX;
6e90668e
SM
2516}
2517
2518sub padany {
2519 my $self = shift;
2520 my $op = shift;
2521 return substr($self->padname($op->targ), 1); # skip $/@/%
2522}
2523
2524sub pp_padsv {
2525 my $self = shift;
9d2c6865
SM
2526 my($op, $cx) = @_;
2527 return $self->maybe_my($op, $cx, $self->padname($op->targ));
6e90668e
SM
2528}
2529
2530sub pp_padav { pp_padsv(@_) }
2531sub pp_padhv { pp_padsv(@_) }
2532
9d2c6865
SM
2533my @threadsv_names;
2534
2535BEGIN {
2536 @threadsv_names = ("_", "1", "2", "3", "4", "5", "6", "7", "8", "9",
2537 "&", "`", "'", "+", "/", ".", ",", "\\", '"', ";",
2538 "^", "-", "%", "=", "|", "~", ":", "^A", "^E",
2539 "!", "@");
2540}
f6f9bdb7
SM
2541
2542sub pp_threadsv {
2543 my $self = shift;
9d2c6865
SM
2544 my($op, $cx) = @_;
2545 return $self->maybe_local($op, $cx, "\$" . $threadsv_names[$op->targ]);
f6f9bdb7
SM
2546}
2547
6f611a1a 2548sub gv_or_padgv {
18228111
GS
2549 my $self = shift;
2550 my $op = shift;
6f611a1a
GS
2551 if (class($op) eq "PADOP") {
2552 return $self->padval($op->padix);
2553 } else { # class($op) eq "SVOP"
2554 return $op->gv;
18228111 2555 }
18228111
GS
2556}
2557
6e90668e
SM
2558sub pp_gvsv {
2559 my $self = shift;
9d2c6865 2560 my($op, $cx) = @_;
6f611a1a 2561 my $gv = $self->gv_or_padgv($op);
8510e997
RH
2562 return $self->maybe_local($op, $cx, $self->stash_variable("\$",
2563 $self->gv_name($gv)));
6e90668e
SM
2564}
2565
2566sub pp_gv {
2567 my $self = shift;
9d2c6865 2568 my($op, $cx) = @_;
6f611a1a 2569 my $gv = $self->gv_or_padgv($op);
18228111 2570 return $self->gv_name($gv);
6e90668e
SM
2571}
2572
2573sub pp_aelemfast {
2574 my $self = shift;
9d2c6865 2575 my($op, $cx) = @_;
6f611a1a 2576 my $gv = $self->gv_or_padgv($op);
ce4e655d
RH
2577 my $name = $self->gv_name($gv);
2578 $name = $self->{'curstash'}."::$name"
2579 if $name !~ /::/ && $self->lex_in_scope('@'.$name);
2580
2581 return "\$" . $name . "[" .
7a9b44b9 2582 ($op->private + $self->{'arybase'}) . "]";
6e90668e
SM
2583}
2584
2585sub rv2x {
2586 my $self = shift;
9d2c6865 2587 my($op, $cx, $type) = @_;
90c0eb26
RH
2588
2589 if (class($op) eq 'NULL' || !$op->can("first")) {
2590 Carp::cluck("Unexpected op in pp_rv2x");
2591 return 'XXX';
2592 }
6e90668e 2593 my $kid = $op->first;
f5aa8f4e 2594 my $str = $self->deparse($kid, 0);
8510e997
RH
2595 return $self->stash_variable($type, $str) if is_scalar($kid);
2596 return $type ."{$str}";
6e90668e
SM
2597}
2598
2599sub pp_rv2sv { maybe_local(@_, rv2x(@_, "\$")) }
2600sub pp_rv2hv { maybe_local(@_, rv2x(@_, "%")) }
2601sub pp_rv2gv { maybe_local(@_, rv2x(@_, "*")) }
2602
2603# skip rv2av
2604sub pp_av2arylen {
2605 my $self = shift;
9d2c6865 2606 my($op, $cx) = @_;
3f872cb9 2607 if ($op->first->name eq "padav") {
9d2c6865 2608 return $self->maybe_local($op, $cx, '$#' . $self->padany($op->first));
6e90668e 2609 } else {
f5aa8f4e
SM
2610 return $self->maybe_local($op, $cx,
2611 $self->rv2x($op->first, $cx, '$#'));
6e90668e
SM
2612 }
2613}
2614
2615# skip down to the old, ex-rv2cv
90c0eb26
RH
2616sub pp_rv2cv {
2617 my ($self, $op, $cx) = @_;
2618 if (!null($op->first) && $op->first->name eq 'null' &&
2619 $op->first->targ eq OP_LIST)
2620 {
2621 return $self->rv2x($op->first->first->sibling, $cx, "&")
2622 }
2623 else {
2624 return $self->rv2x($op, $cx, "")
2625 }
2626}
6e90668e
SM
2627
2628sub pp_rv2av {
2629 my $self = shift;
9d2c6865 2630 my($op, $cx) = @_;
6e90668e 2631 my $kid = $op->first;
3f872cb9 2632 if ($kid->name eq "const") { # constant list
18228111 2633 my $av = $self->const_sv($kid);
6e90668e
SM
2634 return "(" . join(", ", map(const($_), $av->ARRAY)) . ")";
2635 } else {
9d2c6865 2636 return $self->maybe_local($op, $cx, $self->rv2x($op, $cx, "\@"));
6e90668e
SM
2637 }
2638 }
2639
3ed82cfc
GS
2640sub is_subscriptable {
2641 my $op = shift;
2642 if ($op->name =~ /^[ahg]elem/) {
2643 return 1;
2644 } elsif ($op->name eq "entersub") {
2645 my $kid = $op->first;
2646 return 0 unless null $kid->sibling;
2647 $kid = $kid->first;
2648 $kid = $kid->sibling until null $kid->sibling;
2649 return 0 if is_scope($kid);
2650 $kid = $kid->first;
2651 return 0 if $kid->name eq "gv";
2652 return 0 if is_scalar($kid);
2653 return is_subscriptable($kid);
2654 } else {
2655 return 0;
2656 }
2657}
6e90668e
SM
2658
2659sub elem {
2660 my $self = shift;
9d2c6865 2661 my ($op, $cx, $left, $right, $padname) = @_;
6e90668e 2662 my($array, $idx) = ($op->first, $op->first->sibling);
3f872cb9 2663 unless ($array->name eq $padname) { # Maybe this has been fixed
6e90668e
SM
2664 $array = $array->first; # skip rv2av (or ex-rv2av in _53+)
2665 }
3f872cb9 2666 if ($array->name eq $padname) {
6e90668e
SM
2667 $array = $self->padany($array);
2668 } elsif (is_scope($array)) { # ${expr}[0]
9d2c6865 2669 $array = "{" . $self->deparse($array, 0) . "}";
ce4e655d
RH
2670 } elsif ($array->name eq "gv") {
2671 $array = $self->gv_name($self->gv_or_padgv($array));
2672 if ($array !~ /::/) {
2673 my $prefix = ($left eq '[' ? '@' : '%');
2674 $array = $self->{curstash}.'::'.$array
2675 if $self->lex_in_scope($prefix . $array);
2676 }
6e90668e 2677 } elsif (is_scalar $array) { # $x[0], $$x[0], ...
9d2c6865 2678 $array = $self->deparse($array, 24);
6e90668e
SM
2679 } else {
2680 # $x[20][3]{hi} or expr->[20]
3ed82cfc 2681 my $arrow = is_subscriptable($array) ? "" : "->";
9d2c6865
SM
2682 return $self->deparse($array, 24) . $arrow .
2683 $left . $self->deparse($idx, 1) . $right;
6e90668e 2684 }
9d2c6865 2685 $idx = $self->deparse($idx, 1);
7a9b44b9
RH
2686
2687 # Outer parens in an array index will confuse perl
2688 # if we're interpolating in a regular expression, i.e.
2689 # /$x$foo[(-1)]/ is *not* the same as /$x$foo[-1]/
2690 #
2691 # If $self->{parens}, then an initial '(' will
2692 # definitely be paired with a final ')'. If
2693 # !$self->{parens}, the misleading parens won't
2694 # have been added in the first place.
2695 #
2696 # [You might think that we could get "(...)...(...)"
2697 # where the initial and final parens do not match
2698 # each other. But we can't, because the above would
2699 # only happen if there's an infix binop between the
2700 # two pairs of parens, and *that* means that the whole
2701 # expression would be parenthesized as well.]
2702 #
2703 $idx =~ s/^\((.*)\)$/$1/ if $self->{'parens'};
2704
098251bc
RH
2705 # Hash-element braces will autoquote a bareword inside themselves.
2706 # We need to make sure that C<$hash{warn()}> doesn't come out as
2707 # C<$hash{warn}>, which has a quite different meaning. Currently
2708 # B::Deparse will always quote strings, even if the string was a
2709 # bareword in the original (i.e. the OPpCONST_BARE flag is ignored
2710 # for constant strings.) So we can cheat slightly here - if we see
2711 # a bareword, we know that it is supposed to be a function call.
2712 #
2713 $idx =~ s/^([A-Za-z_]\w*)$/$1()/;
2714
6e90668e
SM
2715 return "\$" . $array . $left . $idx . $right;
2716}
2717
3f872cb9
GS
2718sub pp_aelem { maybe_local(@_, elem(@_, "[", "]", "padav")) }
2719sub pp_helem { maybe_local(@_, elem(@_, "{", "}", "padhv")) }
6e90668e
SM
2720
2721sub pp_gelem {
2722 my $self = shift;
9d2c6865 2723 my($op, $cx) = @_;
6e90668e
SM
2724 my($glob, $part) = ($op->first, $op->last);
2725 $glob = $glob->first; # skip rv2gv
3f872cb9 2726 $glob = $glob->first if $glob->name eq "rv2gv"; # this one's a bug
9d2c6865
SM
2727 my $scope = is_scope($glob);
2728 $glob = $self->deparse($glob, 0);
2729 $part = $self->deparse($part, 1);
6e90668e
SM
2730 return "*" . ($scope ? "{$glob}" : $glob) . "{$part}";
2731}
2732
2733sub slice {
2734 my $self = shift;
9d2c6865 2735 my ($op, $cx, $left, $right, $regname, $padname) = @_;
6e90668e
SM
2736 my $last;
2737 my(@elems, $kid, $array, $list);
2738 if (class($op) eq "LISTOP") {
2739 $last = $op->last;
2740 } else { # ex-hslice inside delete()
2741 for ($kid = $op->first; !null $kid->sibling; $kid = $kid->sibling) {}
2742 $last = $kid;
2743 }
2744 $array = $last;
2745 $array = $array->first
3f872cb9 2746 if $array->name eq $regname or $array->name eq "null";
6e90668e 2747 if (is_scope($array)) {
9d2c6865 2748 $array = "{" . $self->deparse($array, 0) . "}";
3f872cb9 2749 } elsif ($array->name eq $padname) {
6e90668e
SM
2750 $array = $self->padany($array);
2751 } else {
9d2c6865 2752 $array = $self->deparse($array, 24);
6e90668e
SM
2753 }
2754 $kid = $op->first->sibling; # skip pushmark
3f872cb9 2755 if ($kid->name eq "list") {
6e90668e
SM
2756 $kid = $kid->first->sibling; # skip list, pushmark
2757 for (; !null $kid; $kid = $kid->sibling) {
9d2c6865 2758 push @elems, $self->deparse($kid, 6);
6e90668e
SM
2759 }
2760 $list = join(", ", @elems);
2761 } else {
9d2c6865 2762 $list = $self->deparse($kid, 1);
6e90668e
SM
2763 }
2764 return "\@" . $array . $left . $list . $right;
2765}
2766
3ed82cfc
GS
2767sub pp_aslice { maybe_local(@_, slice(@_, "[", "]", "rv2av", "padav")) }
2768sub pp_hslice { maybe_local(@_, slice(@_, "{", "}", "rv2hv", "padhv")) }
6e90668e
SM
2769
2770sub pp_lslice {
2771 my $self = shift;
9d2c6865 2772 my($op, $cx) = @_;
6e90668e
SM
2773 my $idx = $op->first;
2774 my $list = $op->last;
2775 my(@elems, $kid);
9d2c6865
SM
2776 $list = $self->deparse($list, 1);
2777 $idx = $self->deparse($idx, 1);
2778 return "($list)" . "[$idx]";
6e90668e
SM
2779}
2780
6e90668e
SM
2781sub want_scalar {
2782 my $op = shift;
2783 return ($op->flags & OPf_WANT) == OPf_WANT_SCALAR;
2784}
2785
bd0865ec
GS
2786sub want_list {
2787 my $op = shift;
2788 return ($op->flags & OPf_WANT) == OPf_WANT_LIST;
2789}
2790
2791sub method {
6e90668e 2792 my $self = shift;
9d2c6865 2793 my($op, $cx) = @_;
bd0865ec
GS
2794 my $kid = $op->first->sibling; # skip pushmark
2795 my($meth, $obj, @exprs);
3f872cb9 2796 if ($kid->name eq "list" and want_list $kid) {
bd0865ec
GS
2797 # When an indirect object isn't a bareword but the args are in
2798 # parens, the parens aren't part of the method syntax (the LLAFR
2799 # doesn't apply), but they make a list with OPf_PARENS set that
2800 # doesn't get flattened by the append_elem that adds the method,
2801 # making a (object, arg1, arg2, ...) list where the object
2802 # usually is. This can be distinguished from
2803 # `($obj, $arg1, $arg2)->meth()' (which is legal if $arg2 is an
2804 # object) because in the later the list is in scalar context
2805 # as the left side of -> always is, while in the former
2806 # the list is in list context as method arguments always are.
2807 # (Good thing there aren't method prototypes!)
3ed82cfc 2808 $meth = $kid->sibling;
bd0865ec
GS
2809 $kid = $kid->first->sibling; # skip pushmark
2810 $obj = $kid;
6e90668e 2811 $kid = $kid->sibling;
bd0865ec 2812 for (; not null $kid; $kid = $kid->sibling) {
9d2c6865 2813 push @exprs, $self->deparse($kid, 6);
6e90668e 2814 }
bd0865ec
GS
2815 } else {
2816 $obj = $kid;
2817 $kid = $kid->sibling;
90c0eb26
RH
2818 for (; !null ($kid->sibling) && $kid->name ne "method_named";
2819 $kid = $kid->sibling) {
bd0865ec 2820 push @exprs, $self->deparse($kid, 6);
6e90668e 2821 }
3ed82cfc 2822 $meth = $kid;
bd0865ec
GS
2823 }
2824 $obj = $self->deparse($obj, 24);
3ed82cfc 2825 if ($meth->name eq "method_named") {
18228111 2826 $meth = $self->const_sv($meth)->PV;
bd0865ec 2827 } else {
3ed82cfc
GS
2828 $meth = $meth->first;
2829 if ($meth->name eq "const") {
2830 # As of 5.005_58, this case is probably obsoleted by the
2831 # method_named case above
18228111 2832 $meth = $self->const_sv($meth)->PV; # needs to be bare
3ed82cfc
GS
2833 } else {
2834 $meth = $self->deparse($meth, 1);
2835 }
bd0865ec
GS
2836 }
2837 my $args = join(", ", @exprs);
2838 $kid = $obj . "->" . $meth;
145eb477 2839 if (length $args) {
bd0865ec
GS
2840 return $kid . "(" . $args . ")"; # parens mandatory
2841 } else {
2842 return $kid;
2843 }
2844}
2845
2846# returns "&" if the prototype doesn't match the args,
2847# or ("", $args_after_prototype_demunging) if it does.
2848sub check_proto {
2849 my $self = shift;
2850 my($proto, @args) = @_;
2851 my($arg, $real);
2852 my $doneok = 0;
2853 my @reals;
2854 # An unbackslashed @ or % gobbles up the rest of the args
2855 $proto =~ s/([^\\]|^)([@%])(.*)$/$1$2/;
2856 while ($proto) {
2857 $proto =~ s/^ *([\\]?[\$\@&%*]|;)//;
2858 my $chr = $1;
2859 if ($chr eq "") {
2860 return "&" if @args;
2861 } elsif ($chr eq ";") {
2862 $doneok = 1;
2863 } elsif ($chr eq "@" or $chr eq "%") {
2864 push @reals, map($self->deparse($_, 6), @args);
2865 @args = ();
6e90668e 2866 } else {
bd0865ec
GS
2867 $arg = shift @args;
2868 last unless $arg;
2869 if ($chr eq "\$") {
2870 if (want_scalar $arg) {
2871 push @reals, $self->deparse($arg, 6);
2872 } else {
2873 return "&";
2874 }
2875 } elsif ($chr eq "&") {
3f872cb9 2876 if ($arg->name =~ /^(s?refgen|undef)$/) {
bd0865ec
GS
2877 push @reals, $self->deparse($arg, 6);
2878 } else {
2879 return "&";
2880 }
2881 } elsif ($chr eq "*") {
3f872cb9
GS
2882 if ($arg->name =~ /^s?refgen$/
2883 and $arg->first->first->name eq "rv2gv")
bd0865ec
GS
2884 {
2885 $real = $arg->first->first; # skip refgen, null
3f872cb9 2886 if ($real->first->name eq "gv") {
bd0865ec
GS
2887 push @reals, $self->deparse($real, 6);
2888 } else {
2889 push @reals, $self->deparse($real->first, 6);
2890 }
2891 } else {
2892 return "&";
2893 }
2894 } elsif (substr($chr, 0, 1) eq "\\") {
2895 $chr = substr($chr, 1);
3f872cb9 2896 if ($arg->name =~ /^s?refgen$/ and
bd0865ec
GS
2897 !null($real = $arg->first) and
2898 ($chr eq "\$" && is_scalar($real->first)
2899 or ($chr eq "\@"
3f872cb9
GS
2900 && $real->first->sibling->name
2901 =~ /^(rv2|pad)av$/)
bd0865ec 2902 or ($chr eq "%"
3f872cb9
GS
2903 && $real->first->sibling->name
2904 =~ /^(rv2|pad)hv$/)
bd0865ec 2905 #or ($chr eq "&" # This doesn't work
3f872cb9 2906 # && $real->first->name eq "rv2cv")
bd0865ec 2907 or ($chr eq "*"
3f872cb9 2908 && $real->first->name eq "rv2gv")))
bd0865ec
GS
2909 {
2910 push @reals, $self->deparse($real, 6);
2911 } else {
2912 return "&";
2913 }
2914 }
2915 }
9d2c6865 2916 }
bd0865ec
GS
2917 return "&" if $proto and !$doneok; # too few args and no `;'
2918 return "&" if @args; # too many args
2919 return ("", join ", ", @reals);
2920}
2921
2922sub pp_entersub {
2923 my $self = shift;
2924 my($op, $cx) = @_;
2925 return $self->method($op, $cx) unless null $op->first->sibling;
2926 my $prefix = "";
2927 my $amper = "";
2928 my($kid, @exprs);
90c0eb26 2929 if ($op->flags & OPf_SPECIAL && !($op->flags & OPf_MOD)) {
9d2c6865
SM
2930 $prefix = "do ";
2931 } elsif ($op->private & OPpENTERSUB_AMPER) {
2932 $amper = "&";
2933 }
2934 $kid = $op->first;
2935 $kid = $kid->first->sibling; # skip ex-list, pushmark
2936 for (; not null $kid->sibling; $kid = $kid->sibling) {
2937 push @exprs, $kid;
2938 }
bd0865ec
GS
2939 my $simple = 0;
2940 my $proto = undef;
9d2c6865
SM
2941 if (is_scope($kid)) {
2942 $amper = "&";
2943 $kid = "{" . $self->deparse($kid, 0) . "}";
3f872cb9 2944 } elsif ($kid->first->name eq "gv") {
6f611a1a 2945 my $gv = $self->gv_or_padgv($kid->first);
9d2c6865
SM
2946 if (class($gv->CV) ne "SPECIAL") {
2947 $proto = $gv->CV->PV if $gv->CV->FLAGS & SVf_POK;
2948 }
bd0865ec 2949 $simple = 1; # only calls of named functions can be prototyped
9d2c6865 2950 $kid = $self->deparse($kid, 24);
90c0eb26 2951 } elsif (is_scalar ($kid->first) && $kid->first->name ne 'rv2cv') {
9d2c6865
SM
2952 $amper = "&";
2953 $kid = $self->deparse($kid, 24);
2954 } else {
2955 $prefix = "";
3ed82cfc
GS
2956 my $arrow = is_subscriptable($kid->first) ? "" : "->";
2957 $kid = $self->deparse($kid, 24) . $arrow;
9d2c6865 2958 }
0ca62a8e
RH
2959
2960 # Doesn't matter how many prototypes there are, if
2961 # they haven't happened yet!
2962 my $declared = exists $self->{'subs_declared'}{$kid};
e99ebc55
RH
2963 if (!$declared && defined($proto)) {
2964 # Avoid "too early to check prototype" warning
2965 ($amper, $proto) = ('&');
2966 }
0ca62a8e 2967
bd0865ec 2968 my $args;
0ca62a8e 2969 if ($declared and defined $proto and not $amper) {
bd0865ec
GS
2970 ($amper, $args) = $self->check_proto($proto, @exprs);
2971 if ($amper eq "&") {
9d2c6865
SM
2972 $args = join(", ", map($self->deparse($_, 6), @exprs));
2973 }
2974 } else {
2975 $args = join(", ", map($self->deparse($_, 6), @exprs));
6e90668e 2976 }
9d2c6865
SM
2977 if ($prefix or $amper) {
2978 if ($op->flags & OPf_STACKED) {
2979 return $prefix . $amper . $kid . "(" . $args . ")";
2980 } else {
2981 return $prefix . $amper. $kid;
2982 }
6e90668e 2983 } else {
34a48b4b 2984 # glob() invocations can be translated into calls of
d1be9408 2985 # CORE::GLOBAL::glob with a second parameter, a number.
34a48b4b
RH
2986 # Reverse this.
2987 if ($kid eq "CORE::GLOBAL::glob") {
2988 $kid = "glob";
2989 $args =~ s/\s*,[^,]+$//;
2990 }
2991
2992 # It's a syntax error to call CORE::GLOBAL::foo without a prefix,
2993 # so it must have been translated from a keyword call. Translate
2994 # it back.
2995 $kid =~ s/^CORE::GLOBAL:://;
2996
0ca62a8e
RH
2997 if (!$declared) {
2998 return "$kid(" . $args . ")";
2999 } elsif (defined $proto and $proto eq "") {
9d2c6865 3000 return $kid;
ce4e655d 3001 } elsif (defined $proto and $proto eq "\$" and is_scalar($exprs[0])) {
9d2c6865 3002 return $self->maybe_parens_func($kid, $args, $cx, 16);
6f611a1a 3003 } elsif (defined($proto) && $proto or $simple) {
9d2c6865
SM
3004 return $self->maybe_parens_func($kid, $args, $cx, 5);
3005 } else {
3006 return "$kid(" . $args . ")";
3007 }
6e90668e
SM
3008 }
3009}
3010
3011sub pp_enterwrite { unop(@_, "write") }
3012
3013# escape things that cause interpolation in double quotes,
3014# but not character escapes
3015sub uninterp {
3016 my($str) = @_;
3f766ba3 3017 $str =~ s/(^|\G|[^\\])((?:\\\\)*)([\$\@]|\\[uUlLQE])/$1$2\\$3/g;
9d2c6865
SM
3018 return $str;
3019}
3020
b7dad2dc
RH
3021{
3022my $bal;
3023BEGIN {
cdf8218f
RH
3024 use re "eval";
3025 # Matches any string which is balanced with respect to {braces}
b7dad2dc 3026 $bal = qr(
cdf8218f
RH
3027 (?:
3028 [^\\{}]
3029 | \\\\
3030 | \\[{}]
3031 | \{(??{$bal})\}
3032 )*
3033 )x;
b7dad2dc
RH
3034}
3035
3036# the same, but treat $|, $), $( and $ at the end of the string differently
3037sub re_uninterp {
3038 my($str) = @_;
cdf8218f
RH
3039
3040 $str =~ s/
3041 ( ^|\G # $1
3042 | [^\\]
3043 )
3044
3045 ( # $2
3046 (?:\\\\)*
3047 )
3048
3049 ( # $3
3050 (\(\?\??\{$bal\}\)) # $4
3051 | [\$\@]
3052 (?!\||\)|\(|$)
3053 | \\[uUlLQE]
3054 )
3055
3056 /length($4) ? "$1$2$4" : "$1$2\\$3"/xeg;
3057
6e90668e
SM
3058 return $str;
3059}
3060
b7dad2dc
RH
3061# This is for regular expressions with the /x modifier
3062# We have to leave comments unmangled.
a9760014 3063sub re_uninterp_extended {
b7dad2dc
RH
3064 my($str) = @_;
3065
3066 $str =~ s/
3067 ( ^|\G # $1
3068 | [^\\]
3069 )
3070
3071 ( # $2
3072 (?:\\\\)*
3073 )
3074
3075 ( # $3
3076 ( \(\?\??\{$bal\}\) # $4 (skip over (?{}) and (??{}) blocks)
3077 | \#[^\n]* # (skip over comments)
3078 )
3079 | [\$\@]
3080 (?!\||\)|\(|$)
3081 | \\[uUlLQE]
3082 )
3083
3084 /length($4) ? "$1$2$4" : "$1$2\\$3"/xeg;
3085
a9760014
RH
3086 return $str;
3087}
b7dad2dc 3088}
a9760014 3089
6e90668e 3090# character escapes, but not delimiters that might need to be escaped
746698c5 3091sub escape_str { # ASCII, UTF8
6e90668e 3092 my($str) = @_;
746698c5 3093 $str =~ s/(.)/ord($1)>255 ? sprintf("\\x{%x}", ord($1)) : $1/eg;
6e90668e
SM
3094 $str =~ s/\a/\\a/g;
3095# $str =~ s/\cH/\\b/g; # \b means someting different in a regex
3096 $str =~ s/\t/\\t/g;
3097 $str =~ s/\n/\\n/g;
3098 $str =~ s/\e/\\e/g;
3099 $str =~ s/\f/\\f/g;
3100 $str =~ s/\r/\\r/g;
3101 $str =~ s/([\cA-\cZ])/'\\c' . chr(ord('@') + ord($1))/ge;
3102 $str =~ s/([\0\033-\037\177-\377])/'\\' . sprintf("%03o", ord($1))/ge;
3103 return $str;
3104}
3105
b7dad2dc
RH
3106# For regexes with the /x modifier.
3107# Leave whitespace unmangled.
a9760014
RH
3108sub escape_extended_re {
3109 my($str) = @_;
3110 $str =~ s/(.)/ord($1)>255 ? sprintf("\\x{%x}", ord($1)) : $1/eg;
3111 $str =~ s/([\0\033-\037\177-\377])/'\\' . sprintf("%03o", ord($1))/ge;
3112 $str =~ s/\n/\n\f/g;
3113 return $str;
3114}
3115
9d2c6865
SM
3116# Don't do this for regexen
3117sub unback {
3118 my($str) = @_;
3119 $str =~ s/\\/\\\\/g;
3120 return $str;
3121}
3122
08c6f5ec
RH
3123# Remove backslashes which precede literal control characters,
3124# to avoid creating ambiguity when we escape the latter.
3125sub re_unback {
3126 my($str) = @_;
3127
3128 # the insane complexity here is due to the behaviour of "\c\"
3129 $str =~ s/(^|[^\\]|\\c\\)(?<!\\c)\\(\\\\)*(?=[\0-\031\177-\377])/$1$2/g;
3130 return $str;
3131}
3132
6e90668e
SM
3133sub balanced_delim {
3134 my($str) = @_;
3135 my @str = split //, $str;
3136 my($ar, $open, $close, $fail, $c, $cnt);
3137 for $ar (['[',']'], ['(',')'], ['<','>'], ['{','}']) {
3138 ($open, $close) = @$ar;
3139 $fail = 0; $cnt = 0;
3140 for $c (@str) {
3141 if ($c eq $open) {
3142 $cnt++;
3143 } elsif ($c eq $close) {
3144 $cnt--;
3145 if ($cnt < 0) {
bd0865ec 3146 # qq()() isn't ")("
6e90668e
SM
3147 $fail = 1;
3148 last;
3149 }
3150 }
3151 }
3152 $fail = 1 if $cnt != 0;
3153 return ($open, "$open$str$close") if not $fail;
3154 }
3155 return ("", $str);
3156}
3157
3158sub single_delim {
3159 my($q, $default, $str) = @_;
90be192f 3160 return "$default$str$default" if $default and index($str, $default) == -1;
8347ad86
RGS
3161 if ($q ne 'qr') {
3162 (my $succeed, $str) = balanced_delim($str);
3163 return "$q$str" if $succeed;
3164 }
3165 for my $delim ('/', '"', '#') {
6e90668e
SM
3166 return "$q$delim" . $str . $delim if index($str, $delim) == -1;
3167 }
90be192f
SM
3168 if ($default) {
3169 $str =~ s/$default/\\$default/g;
3170 return "$default$str$default";
3171 } else {
3172 $str =~ s[/][\\/]g;
3173 return "$q/$str/";
3174 }
6e90668e
SM
3175}
3176
6e90668e
SM
3177sub const {
3178 my $sv = shift;
3179 if (class($sv) eq "SPECIAL") {
bd0865ec 3180 return ('undef', '1', '0')[$$sv-1]; # sv_undef, sv_yes, sv_no
7a9b44b9
RH
3181 } elsif (class($sv) eq "NULL") {
3182 return 'undef';
6e90668e 3183 } elsif ($sv->FLAGS & SVf_IOK) {
d9963e60 3184 return $sv->int_value;
6e90668e 3185 } elsif ($sv->FLAGS & SVf_NOK) {
fecea806
RH
3186 # try the default stringification
3187 my $r = "".$sv->NV;
3188 if ($r =~ /e/) {
3189 # If it's in scientific notation, we might have lost information
3190 return sprintf("%.20e", $sv->NV);
3191 }
3192 return $r;
7a9b44b9 3193 } elsif ($sv->FLAGS & SVf_ROK && $sv->can("RV")) {
6e90668e 3194 return "\\(" . const($sv->RV) . ")"; # constant folded
34768ba5 3195 } elsif ($sv->FLAGS & SVf_POK) {
6e90668e 3196 my $str = $sv->PV;
bd0865ec 3197 if ($str =~ /[^ -~]/) { # ASCII for non-printing
9d2c6865 3198 return single_delim("qq", '"', uninterp escape_str unback $str);
6e90668e 3199 } else {
bd0865ec 3200 return single_delim("q", "'", unback $str);
6e90668e 3201 }
34768ba5
RH
3202 } else {
3203 return "undef";
a798dbf2
MB
3204 }
3205}
3206
18228111
GS
3207sub const_sv {
3208 my $self = shift;
3209 my $op = shift;
3210 my $sv = $op->sv;
3211 # the constant could be in the pad (under useithreads)
3212 $sv = $self->padval($op->targ) unless $$sv;
3213 return $sv;
3214}
3215
6e90668e
SM
3216sub pp_const {
3217 my $self = shift;
9d2c6865 3218 my($op, $cx) = @_;
7e40138b
RH
3219 if ($op->private & OPpCONST_ARYBASE) {
3220 return '$[';
3221 }
4c1f658f 3222# if ($op->private & OPpCONST_BARE) { # trouble with `=>' autoquoting
18228111 3223# return $self->const_sv($op)->PV;
6e90668e 3224# }
18228111 3225 my $sv = $self->const_sv($op);
d5ae42cc
JM
3226# return const($sv);
3227 my $c = const $sv;
76ef7183 3228 return $c =~ /^-\d/ ? $self->maybe_parens($c, $cx, 21) : $c;
6e90668e
SM
3229}
3230
3231sub dq {
3232 my $self = shift;
3233 my $op = shift;
3f872cb9
GS
3234 my $type = $op->name;
3235 if ($type eq "const") {
f3402b25
RH
3236 return '$[' if $op->private & OPpCONST_ARYBASE;
3237 return uninterp(escape_str(unback($self->const_sv($op)->as_string)));
3f872cb9 3238 } elsif ($type eq "concat") {
8fed1104
RH
3239 my $first = $self->dq($op->first);
3240 my $last = $self->dq($op->last);
44c6d2a1 3241
b7dad2dc 3242 # Disambiguate "${foo}bar", "${foo}{bar}", "${foo}[1]"
44c6d2a1
RH
3243 ($last =~ /^[A-Z\\\^\[\]_?]/ &&
3244 $first =~ s/([\$@])\^$/${1}{^}/) # "${^}W" etc
3245 || ($last =~ /^[{\[\w_]/ &&
3246 $first =~ s/([\$@])([A-Za-z_]\w*)$/${1}{$2}/);
3247
8fed1104 3248 return $first . $last;
3f872cb9 3249 } elsif ($type eq "uc") {
6e90668e 3250 return '\U' . $self->dq($op->first->sibling) . '\E';
3f872cb9 3251 } elsif ($type eq "lc") {
6e90668e 3252 return '\L' . $self->dq($op->first->sibling) . '\E';
3f872cb9 3253 } elsif ($type eq "ucfirst") {
6e90668e 3254 return '\u' . $self->dq($op->first->sibling);
3f872cb9 3255 } elsif ($type eq "lcfirst") {
6e90668e 3256 return '\l' . $self->dq($op->first->sibling);
3f872cb9 3257 } elsif ($type eq "quotemeta") {
6e90668e 3258 return '\Q' . $self->dq($op->first->sibling) . '\E';
3f872cb9 3259 } elsif ($type eq "join") {
9d2c6865 3260 return $self->deparse($op->last, 26); # was join($", @ary)
a798dbf2 3261 } else {
9d2c6865 3262 return $self->deparse($op, 26);
6e90668e
SM
3263 }
3264}
3265
3266sub pp_backtick {
3267 my $self = shift;
9d2c6865 3268 my($op, $cx) = @_;
6e90668e
SM
3269 # skip pushmark
3270 return single_delim("qx", '`', $self->dq($op->first->sibling));
3271}
3272
3273sub dquote {
3274 my $self = shift;
6f611a1a 3275 my($op, $cx) = @_;
3ed82cfc
GS
3276 my $kid = $op->first->sibling; # skip ex-stringify, pushmark
3277 return $self->deparse($kid, $cx) if $self->{'unquote'};
3278 $self->maybe_targmy($kid, $cx,
3279 sub {single_delim("qq", '"', $self->dq($_[1]))});
6e90668e
SM
3280}
3281
bd0865ec 3282# OP_STRINGIFY is a listop, but it only ever has one arg
3ed82cfc 3283sub pp_stringify { maybe_targmy(@_, \&dquote) }
6e90668e
SM
3284
3285# tr/// and s/// (and tr[][], tr[]//, tr###, etc)
3286# note that tr(from)/to/ is OK, but not tr/from/(to)
3287sub double_delim {
3288 my($from, $to) = @_;
3289 my($succeed, $delim);
3290 if ($from !~ m[/] and $to !~ m[/]) {
3291 return "/$from/$to/";
3292 } elsif (($succeed, $from) = balanced_delim($from) and $succeed) {
3293 if (($succeed, $to) = balanced_delim($to) and $succeed) {
3294 return "$from$to";
3295 } else {
3296 for $delim ('/', '"', '#') { # note no `'' -- s''' is special
3297 return "$from$delim$to$delim" if index($to, $delim) == -1;
3298 }
3299 $to =~ s[/][\\/]g;
3300 return "$from/$to/";
3301 }
3302 } else {
3303 for $delim ('/', '"', '#') { # note no '
3304 return "$delim$from$delim$to$delim"
3305 if index($to . $from, $delim) == -1;
3306 }
3307 $from =~ s[/][\\/]g;
3308 $to =~ s[/][\\/]g;
3309 return "/$from/$to/";
3310 }
3311}
3312
2a9e2f8a 3313# Only used by tr///, so backslashes hyphens
6e90668e
SM
3314sub pchr { # ASCII
3315 my($n) = @_;
3316 if ($n == ord '\\') {
3317 return '\\\\';
2a9e2f8a
RH
3318 } elsif ($n == ord "-") {
3319 return "\\-";
6e90668e
SM
3320 } elsif ($n >= ord(' ') and $n <= ord('~')) {
3321 return chr($n);
3322 } elsif ($n == ord "\a") {
3323 return '\\a';
3324 } elsif ($n == ord "\b") {
3325 return '\\b';
3326 } elsif ($n == ord "\t") {
3327 return '\\t';
3328 } elsif ($n == ord "\n") {
3329 return '\\n';
3330 } elsif ($n == ord "\e") {
3331 return '\\e';
3332 } elsif ($n == ord "\f") {
3333 return '\\f';
3334 } elsif ($n == ord "\r") {
3335 return '\\r';
3336 } elsif ($n >= ord("\cA") and $n <= ord("\cZ")) {
3337 return '\\c' . chr(ord("@") + $n);
3338 } else {
3339# return '\x' . sprintf("%02x", $n);
3340 return '\\' . sprintf("%03o", $n);
3341 }
3342}
3343
3344sub collapse {
3345 my(@chars) = @_;
23db111c 3346 my($str, $c, $tr) = ("");
6e90668e
SM
3347 for ($c = 0; $c < @chars; $c++) {
3348 $tr = $chars[$c];
3349 $str .= pchr($tr);
3350 if ($c <= $#chars - 2 and $chars[$c + 1] == $tr + 1 and
3351 $chars[$c + 2] == $tr + 2)
3352 {
f4a44678
SM
3353 for (; $c <= $#chars-1 and $chars[$c + 1] == $chars[$c] + 1; $c++)
3354 {}
6e90668e
SM
3355 $str .= "-";
3356 $str .= pchr($chars[$c]);
3357 }
3358 }
3359 return $str;
3360}
3361
f4a44678
SM
3362sub tr_decode_byte {
3363 my($table, $flags) = @_;
2a9e2f8a 3364 my(@table) = unpack("s*", $table);
bec89253 3365 splice @table, 0x100, 1; # Number of subsequent elements
6e90668e
SM
3366 my($c, $tr, @from, @to, @delfrom, $delhyphen);
3367 if ($table[ord "-"] != -1 and
3368 $table[ord("-") - 1] == -1 || $table[ord("-") + 1] == -1)
3369 {
3370 $tr = $table[ord "-"];
3371 $table[ord "-"] = -1;
3372 if ($tr >= 0) {
3373 @from = ord("-");
3374 @to = $tr;
3375 } else { # -2 ==> delete
3376 $delhyphen = 1;
3377 }
3378 }
2a9e2f8a 3379 for ($c = 0; $c < @table; $c++) {
6e90668e
SM
3380 $tr = $table[$c];
3381 if ($tr >= 0) {
3382 push @from, $c; push @to, $tr;
3383 } elsif ($tr == -2) {
3384 push @delfrom, $c;
3385 }
3386 }
6e90668e 3387 @from = (@from, @delfrom);
f4a44678 3388 if ($flags & OPpTRANS_COMPLEMENT) {
6e90668e
SM
3389 my @newfrom = ();
3390 my %from;
3391 @from{@from} = (1) x @from;
3392 for ($c = 0; $c < 256; $c++) {
3393 push @newfrom, $c unless $from{$c};
3394 }
3395 @from = @newfrom;
3396 }
56d8b52c 3397 unless ($flags & OPpTRANS_DELETE || !@to) {
6e90668e
SM
3398 pop @to while $#to and $to[$#to] == $to[$#to -1];
3399 }
6e90668e
SM
3400 my($from, $to);
3401 $from = collapse(@from);
3402 $to = collapse(@to);
3403 $from .= "-" if $delhyphen;
f4a44678
SM
3404 return ($from, $to);
3405}
3406
3407sub tr_chr {
3408 my $x = shift;
3409 if ($x == ord "-") {
3410 return "\\-";
2a9e2f8a
RH
3411 } elsif ($x == ord "\\") {
3412 return "\\\\";
f4a44678
SM
3413 } else {
3414 return chr $x;
3415 }
3416}
3417
3418# XXX This doesn't yet handle all cases correctly either
3419
3420sub tr_decode_utf8 {
3421 my($swash_hv, $flags) = @_;
3422 my %swash = $swash_hv->ARRAY;
3423 my $final = undef;
3424 $final = $swash{'FINAL'}->IV if exists $swash{'FINAL'};
3425 my $none = $swash{"NONE"}->IV;
3426 my $extra = $none + 1;
3427 my(@from, @delfrom, @to);
3428 my $line;
3429 foreach $line (split /\n/, $swash{'LIST'}->PV) {
3430 my($min, $max, $result) = split(/\t/, $line);
3431 $min = hex $min;
3432 if (length $max) {
3433 $max = hex $max;
3434 } else {
3435 $max = $min;
3436 }
3437 $result = hex $result;
3438 if ($result == $extra) {
3439 push @delfrom, [$min, $max];
3440 } else {
3441 push @from, [$min, $max];
3442 push @to, [$result, $result + $max - $min];
3443 }
3444 }
3445 for my $i (0 .. $#from) {
3446 if ($from[$i][0] == ord '-') {
3447 unshift @from, splice(@from, $i, 1);
3448 unshift @to, splice(@to, $i, 1);
3449 last;
3450 } elsif ($from[$i][1] == ord '-') {
3451 $from[$i][1]--;
3452 $to[$i][1]--;
3453 unshift @from, ord '-';
3454 unshift @to, ord '-';
3455 last;
3456 }
3457 }
3458 for my $i (0 .. $#delfrom) {
3459 if ($delfrom[$i][0] == ord '-') {
3460 push @delfrom, splice(@delfrom, $i, 1);
3461 last;
3462 } elsif ($delfrom[$i][1] == ord '-') {
3463 $delfrom[$i][1]--;
3464 push @delfrom, ord '-';
3465 last;
3466 }
3467 }
3468 if (defined $final and $to[$#to][1] != $final) {
3469 push @to, [$final, $final];
3470 }
3471 push @from, @delfrom;
3472 if ($flags & OPpTRANS_COMPLEMENT) {
3473 my @newfrom;
3474 my $next = 0;
3475 for my $i (0 .. $#from) {
3476 push @newfrom, [$next, $from[$i][0] - 1];
3477 $next = $from[$i][1] + 1;
3478 }
3479 @from = ();
3480 for my $range (@newfrom) {
3481 if ($range->[0] <= $range->[1]) {
3482 push @from, $range;
3483 }
3484 }
3485 }
3486 my($from, $to, $diff);
3487 for my $chunk (@from) {
3488 $diff = $chunk->[1] - $chunk->[0];
3489 if ($diff > 1) {
3490 $from .= tr_chr($chunk->[0]) . "-" . tr_chr($chunk->[1]);
3491 } elsif ($diff == 1) {
3492 $from .= tr_chr($chunk->[0]) . tr_chr($chunk->[1]);
3493 } else {
3494 $from .= tr_chr($chunk->[0]);
3495 }
3496 }
3497 for my $chunk (@to) {
3498 $diff = $chunk->[1] - $chunk->[0];
3499 if ($diff > 1) {
3500 $to .= tr_chr($chunk->[0]) . "-" . tr_chr($chunk->[1]);
3501 } elsif ($diff == 1) {
3502 $to .= tr_chr($chunk->[0]) . tr_chr($chunk->[1]);
3503 } else {
3504 $to .= tr_chr($chunk->[0]);
3505 }
3506 }
3507 #$final = sprintf("%04x", $final) if defined $final;
3508 #$none = sprintf("%04x", $none) if defined $none;
3509 #$extra = sprintf("%04x", $extra) if defined $extra;
3510 #print STDERR "final: $final\n none: $none\nextra: $extra\n";
3511 #print STDERR $swash{'LIST'}->PV;
3512 return (escape_str($from), escape_str($to));
3513}
3514
3515sub pp_trans {
3516 my $self = shift;
3517 my($op, $cx) = @_;
3518 my($from, $to);
3519 if (class($op) eq "PVOP") {
3520 ($from, $to) = tr_decode_byte($op->pv, $op->private);
3521 } else { # class($op) eq "SVOP"
3522 ($from, $to) = tr_decode_utf8($op->sv->RV, $op->private);
3523 }
3524 my $flags = "";
3525 $flags .= "c" if $op->private & OPpTRANS_COMPLEMENT;
3526 $flags .= "d" if $op->private & OPpTRANS_DELETE;
3527 $to = "" if $from eq $to and $flags eq "";
3528 $flags .= "s" if $op->private & OPpTRANS_SQUASH;
6e90668e
SM
3529 return "tr" . double_delim($from, $to) . $flags;
3530}
3531
3532# Like dq(), but different
3533sub re_dq {
3534 my $self = shift;
a9760014
RH
3535 my ($op, $extended) = @_;
3536
3f872cb9
GS
3537 my $type = $op->name;
3538 if ($type eq "const") {
f3402b25 3539 return '$[' if $op->private & OPpCONST_ARYBASE;
a9760014
RH
3540 my $unbacked = re_unback($self->const_sv($op)->as_string);
3541 return re_uninterp_extended(escape_extended_re($unbacked))
3542 if $extended;
3543 return re_uninterp(escape_str($unbacked));
3f872cb9 3544 } elsif ($type eq "concat") {
a9760014
RH
3545 my $first = $self->re_dq($op->first, $extended);
3546 my $last = $self->re_dq($op->last, $extended);
b73b7152 3547
a0e66df8 3548 # Disambiguate "${foo}bar", "${foo}{bar}", "${foo}[1]"
b73b7152
JH
3549 ($last =~ /^[A-Z\\\^\[\]_?]/ &&
3550 $first =~ s/([\$@])\^$/${1}{^}/) # "${^}W" etc
3551 || ($last =~ /^[{\[\w_]/ &&
3552 $first =~ s/([\$@])([A-Za-z_]\w*)$/${1}{$2}/);
3553
a0e66df8 3554 return $first . $last;
3f872cb9 3555 } elsif ($type eq "uc") {
a9760014 3556 return '\U' . $self->re_dq($op->first->sibling, $extended) . '\E';
3f872cb9 3557 } elsif ($type eq "lc") {
a9760014 3558 return '\L' . $self->re_dq($op->first->sibling, $extended) . '\E';
3f872cb9 3559 } elsif ($type eq "ucfirst") {
a9760014 3560 return '\u' . $self->re_dq($op->first->sibling, $extended);
3f872cb9 3561 } elsif ($type eq "lcfirst") {
a9760014 3562 return '\l' . $self->re_dq($op->first->sibling, $extended);
3f872cb9 3563 } elsif ($type eq "quotemeta") {
a9760014 3564 return '\Q' . $self->re_dq($op->first->sibling, $extended) . '\E';
3f872cb9 3565 } elsif ($type eq "join") {
9d2c6865 3566 return $self->deparse($op->last, 26); # was join($", @ary)
6e90668e 3567 } else {
9d2c6865 3568 return $self->deparse($op, 26);
6e90668e
SM
3569 }
3570}
3571
a9760014
RH
3572sub pure_string {
3573 my ($self, $op) = @_;
3574 my $type = $op->name;
3575
3576 if ($type eq 'const') {
3577 return 1;
3578 }
3579 elsif ($type =~ /^[ul]c(first)?$/ || $type eq 'quotemeta') {
3580 return $self->pure_string($op->first->sibling);
3581 }
3582 elsif ($type eq 'join') {
3583 my $join_op = $op->first->sibling; # Skip pushmark
3584 return 0 unless $join_op->name eq 'null' && $join_op->targ eq OP_RV2SV;
3585
3586 my $gvop = $join_op->first;
3587 return 0 unless $gvop->name eq 'gvsv';
3588 return 0 unless '"' eq $self->gv_name($self->gv_or_padgv($gvop));
3589
3590 return 0 unless ${$join_op->sibling} eq ${$op->last};
3591 return 0 unless $op->last->name =~ /^(rv2|pad)av$/;
3592 }
3593 elsif ($type eq 'concat') {
3594 return $self->pure_string($op->first)
3595 && $self->pure_string($op->last);
3596 }
3597 elsif (is_scalar($op) || $type =~ /^[ah]elem(fast)?$/) {
3598 return 1;
3599 }
3600 else {
3601 return 0;
3602 }
3603
3604 return 1;
3605}
3606
3607sub regcomp {
6e90668e 3608 my $self = shift;
a9760014 3609 my($op, $cx, $extended) = @_;
6e90668e 3610 my $kid = $op->first;
3f872cb9
GS
3611 $kid = $kid->first if $kid->name eq "regcmaybe";
3612 $kid = $kid->first if $kid->name eq "regcreset";
a9760014
RH
3613 return ($self->re_dq($kid, $extended), 1) if $self->pure_string($kid);
3614 return ($self->deparse($kid, $cx), 0);
3615}
3616
3617sub pp_regcomp {
3618 my ($self, $op, $cx) = @_;
3619 return (($self->regcomp($op, $cx, 0))[0]);
6e90668e
SM
3620}
3621
6e90668e
SM
3622# osmic acid -- see osmium tetroxide
3623
3624my %matchwords;
3625map($matchwords{join "", sort split //, $_} = $_, 'cig', 'cog', 'cos', 'cogs',
3626 'cox', 'go', 'is', 'ism', 'iso', 'mig', 'mix', 'osmic', 'ox', 'sic',
3627 'sig', 'six', 'smog', 'so', 'soc', 'sog', 'xi');
3628
90be192f 3629sub matchop {
6e90668e 3630 my $self = shift;
90be192f 3631 my($op, $cx, $name, $delim) = @_;
6e90668e 3632 my $kid = $op->first;
9d2c6865 3633 my ($binop, $var, $re) = ("", "", "");
6e90668e 3634 if ($op->flags & O