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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';
96c57f7e
RGS
564 my $laststash = defined $self->{'curcop'}
565 ? $self->{'curcop'}->stash->NAME : $self->{'curstash'};
566 if (defined *{$laststash."::DATA"}{IO}) {
e31885a0 567 print "__DATA__\n";
96c57f7e 568 print readline(*{$laststash."::DATA"});
e31885a0 569 }
a798dbf2 570 }
a798dbf2
MB
571}
572
f4a44678
SM
573sub coderef2text {
574 my $self = shift;
575 my $sub = shift;
576 croak "Usage: ->coderef2text(CODEREF)" unless ref($sub) eq "CODE";
08c6f5ec
RH
577
578 $self->init();
f4a44678
SM
579 return $self->indent($self->deparse_sub(svref_2object($sub)));
580}
581
08c6f5ec
RH
582sub ambient_pragmas {
583 my $self = shift;
e31885a0 584 my ($arybase, $hint_bits, $warning_bits) = (0, 0);
08c6f5ec
RH
585
586 while (@_ > 1) {
587 my $name = shift();
588 my $val = shift();
589
590 if ($name eq 'strict') {
591 require strict;
592
593 if ($val eq 'none') {
594 $hint_bits &= ~strict::bits(qw/refs subs vars/);
595 next();
596 }
597
598 my @names;
599 if ($val eq "all") {
600 @names = qw/refs subs vars/;
601 }
602 elsif (ref $val) {
603 @names = @$val;
604 }
605 else {
a0405c92 606 @names = split' ', $val;
08c6f5ec
RH
607 }
608 $hint_bits |= strict::bits(@names);
609 }
610
611 elsif ($name eq '$[') {
612 $arybase = $val;
613 }
614
a0405c92
RH
615 elsif ($name eq 'integer'
616 || $name eq 'bytes'
617 || $name eq 'utf8') {
618 require "$name.pm";
08c6f5ec 619 if ($val) {
a0405c92
RH
620 $hint_bits |= ${$::{"${name}::"}{"hint_bits"}};
621 }
622 else {
623 $hint_bits &= ~${$::{"${name}::"}{"hint_bits"}};
624 }
625 }
626
627 elsif ($name eq 're') {
628 require re;
629 if ($val eq 'none') {
2570cdf1 630 $hint_bits &= ~re::bits(qw/taint eval/);
a0405c92
RH
631 next();
632 }
633
634 my @names;
635 if ($val eq 'all') {
2570cdf1 636 @names = qw/taint eval/;
a0405c92
RH
637 }
638 elsif (ref $val) {
639 @names = @$val;
08c6f5ec
RH
640 }
641 else {
a0405c92 642 @names = split' ',$val;
08c6f5ec 643 }
a0405c92 644 $hint_bits |= re::bits(@names);
08c6f5ec
RH
645 }
646
647 elsif ($name eq 'warnings') {
08c6f5ec 648 if ($val eq 'none') {
810aef70 649 $warning_bits = $warnings::NONE;
08c6f5ec
RH
650 next();
651 }
652
653 my @names;
654 if (ref $val) {
655 @names = @$val;
656 }
657 else {
658 @names = split/\s+/, $val;
659 }
660
810aef70 661 $warning_bits = $warnings::NONE if !defined ($warning_bits);
08c6f5ec
RH
662 $warning_bits |= warnings::bits(@names);
663 }
664
665 elsif ($name eq 'warning_bits') {
666 $warning_bits = $val;
667 }
668
669 elsif ($name eq 'hint_bits') {
670 $hint_bits = $val;
671 }
672
673 else {
674 croak "Unknown pragma type: $name";
675 }
676 }
677 if (@_) {
678 croak "The ambient_pragmas method expects an even number of args";
679 }
680
681 $self->{'ambient_arybase'} = $arybase;
682 $self->{'ambient_warnings'} = $warning_bits;
a0405c92 683 $self->{'ambient_hints'} = $hint_bits;
08c6f5ec
RH
684}
685
6e90668e
SM
686sub deparse {
687 my $self = shift;
6ec152c3 688 my($op, $cx, $flags) = @_;
34a48b4b
RH
689
690 Carp::confess("Null op in deparse") if !defined($op)
691 || class($op) eq "NULL";
3f872cb9 692 my $meth = "pp_" . $op->name;
ce4e655d
RH
693 if (is_scope($op)) {
694 return $self->$meth($op, $cx, $flags);
6ec152c3 695 }
9d2c6865 696 return $self->$meth($op, $cx);
a798dbf2
MB
697}
698
6e90668e 699sub indent {
f4a44678 700 my $self = shift;
6e90668e
SM
701 my $txt = shift;
702 my @lines = split(/\n/, $txt);
703 my $leader = "";
f4a44678 704 my $level = 0;
6e90668e
SM
705 my $line;
706 for $line (@lines) {
f4a44678
SM
707 my $cmd = substr($line, 0, 1);
708 if ($cmd eq "\t" or $cmd eq "\b") {
709 $level += ($cmd eq "\t" ? 1 : -1) * $self->{'indent_size'};
710 if ($self->{'use_tabs'}) {
711 $leader = "\t" x ($level / 8) . " " x ($level % 8);
712 } else {
713 $leader = " " x $level;
714 }
6e90668e
SM
715 $line = substr($line, 1);
716 }
f5aa8f4e
SM
717 if (substr($line, 0, 1) eq "\f") {
718 $line = substr($line, 1); # no indent
719 } else {
720 $line = $leader . $line;
721 }
9d2c6865 722 $line =~ s/\cK;?//g;
6e90668e
SM
723 }
724 return join("\n", @lines);
725}
726
6e90668e
SM
727sub deparse_sub {
728 my $self = shift;
729 my $cv = shift;
730 my $proto = "";
ce4e655d 731Carp::confess("NULL in deparse_sub") if !defined($cv) || $cv->isa("B::NULL");
34a48b4b
RH
732Carp::confess("SPECIAL in deparse_sub") if $cv->isa("B::SPECIAL");
733 local $self->{'curcop'} = $self->{'curcop'};
6e90668e
SM
734 if ($cv->FLAGS & SVf_POK) {
735 $proto = "(". $cv->PV . ") ";
736 }
6aaf4108
SC
737 if ($cv->CvFLAGS & (CVf_METHOD|CVf_LOCKED|CVf_LVALUE)) {
738 $proto .= ": ";
739 $proto .= "lvalue " if $cv->CvFLAGS & CVf_LVALUE;
740 $proto .= "locked " if $cv->CvFLAGS & CVf_LOCKED;
741 $proto .= "method " if $cv->CvFLAGS & CVf_METHOD;
742 }
743
6e90668e 744 local($self->{'curcv'}) = $cv;
8510e997 745 local($self->{'curcvlex'});
a0405c92
RH
746 local(@$self{qw'curstash warnings hints'})
747 = @$self{qw'curstash warnings hints'};
ce4e655d 748 my $body;
6e90668e 749 if (not null $cv->ROOT) {
ce4e655d
RH
750 my $lineseq = $cv->ROOT->first;
751 if ($lineseq->name eq "lineseq") {
752 my @ops;
753 for(my$o=$lineseq->first; $$o; $o=$o->sibling) {
754 push @ops, $o;
755 }
756 $body = $self->lineseq(undef, @ops).";";
757 my $scope_en = $self->find_scope_en($lineseq);
758 if (defined $scope_en) {
759 my $subs = join"", $self->seq_subs($scope_en);
760 $body .= ";\n$subs" if length($subs);
761 }
762 }
763 else {
764 $body = $self->deparse($cv->ROOT->first, 0);
765 }
de3f1649 766 }
ce4e655d
RH
767 else {
768 my $sv = $cv->const_sv;
769 if ($$sv) {
770 # uh-oh. inlinable sub... format it differently
771 return $proto . "{ " . const($sv) . " }\n";
772 } else { # XSUB? (or just a declaration)
773 return "$proto;\n";
774 }
6e90668e 775 }
ce4e655d 776 return $proto ."{\n\t$body\n\b}" ."\n";
6e90668e
SM
777}
778
779sub deparse_format {
780 my $self = shift;
781 my $form = shift;
782 my @text;
783 local($self->{'curcv'}) = $form;
8510e997 784 local($self->{'curcvlex'});
67fc2416 785 local($self->{'in_format'}) = 1;
a0405c92 786 local(@$self{qw'curstash warnings hints'})
67fc2416 787 = @$self{qw'curstash warnings hints'};
6e90668e
SM
788 my $op = $form->ROOT;
789 my $kid;
32f2ae54 790 return "\f." if $op->first->name eq 'stub';
6e90668e
SM
791 $op = $op->first->first; # skip leavewrite, lineseq
792 while (not null $op) {
793 $op = $op->sibling; # skip nextstate
794 my @exprs;
795 $kid = $op->first->sibling; # skip pushmark
a5b0cd91 796 push @text, "\f".$self->const_sv($kid)->PV;
6e90668e
SM
797 $kid = $kid->sibling;
798 for (; not null $kid; $kid = $kid->sibling) {
9d2c6865 799 push @exprs, $self->deparse($kid, 0);
6e90668e 800 }
a5b0cd91 801 push @text, "\f".join(", ", @exprs)."\n" if @exprs;
6e90668e
SM
802 $op = $op->sibling;
803 }
a5b0cd91 804 return join("", @text) . "\f.";
6e90668e
SM
805}
806
6e90668e 807sub is_scope {
a798dbf2 808 my $op = shift;
3f872cb9
GS
809 return $op->name eq "leave" || $op->name eq "scope"
810 || $op->name eq "lineseq"
811 || ($op->name eq "null" && class($op) eq "UNOP"
812 && (is_scope($op->first) || $op->first->name eq "enter"));
6e90668e
SM
813}
814
815sub is_state {
3f872cb9
GS
816 my $name = $_[0]->name;
817 return $name eq "nextstate" || $name eq "dbstate" || $name eq "setstate";
6e90668e
SM
818}
819
820sub is_miniwhile { # check for one-line loop (`foo() while $y--')
821 my $op = shift;
822 return (!null($op) and null($op->sibling)
3f872cb9
GS
823 and $op->name eq "null" and class($op) eq "UNOP"
824 and (($op->first->name =~ /^(and|or)$/
825 and $op->first->first->sibling->name eq "lineseq")
826 or ($op->first->name eq "lineseq"
6e90668e 827 and not null $op->first->first->sibling
3f872cb9 828 and $op->first->first->sibling->name eq "unstack")
6e90668e
SM
829 ));
830}
831
832sub is_scalar {
833 my $op = shift;
3f872cb9
GS
834 return ($op->name eq "rv2sv" or
835 $op->name eq "padsv" or
836 $op->name eq "gv" or # only in array/hash constructs
bd0865ec 837 $op->flags & OPf_KIDS && !null($op->first)
3f872cb9 838 && $op->first->name eq "gvsv");
6e90668e
SM
839}
840
9d2c6865
SM
841sub maybe_parens {
842 my $self = shift;
843 my($text, $cx, $prec) = @_;
844 if ($prec < $cx # unary ops nest just fine
845 or $prec == $cx and $cx != 4 and $cx != 16 and $cx != 21
846 or $self->{'parens'})
847 {
848 $text = "($text)";
849 # In a unop, let parent reuse our parens; see maybe_parens_unop
850 $text = "\cS" . $text if $cx == 16;
851 return $text;
852 } else {
853 return $text;
854 }
855}
856
857# same as above, but get around the `if it looks like a function' rule
858sub maybe_parens_unop {
859 my $self = shift;
860 my($name, $kid, $cx) = @_;
861 if ($cx > 16 or $self->{'parens'}) {
a0035eb8
RH
862 $kid = $self->deparse($kid, 1);
863 if ($name eq "umask" && $kid =~ /^\d+$/) {
864 $kid = sprintf("%#o", $kid);
865 }
866 return "$name($kid)";
9d2c6865
SM
867 } else {
868 $kid = $self->deparse($kid, 16);
a0035eb8
RH
869 if ($name eq "umask" && $kid =~ /^\d+$/) {
870 $kid = sprintf("%#o", $kid);
871 }
9d2c6865
SM
872 if (substr($kid, 0, 1) eq "\cS") {
873 # use kid's parens
874 return $name . substr($kid, 1);
875 } elsif (substr($kid, 0, 1) eq "(") {
876 # avoid looks-like-a-function trap with extra parens
877 # (`+' can lead to ambiguities)
878 return "$name(" . $kid . ")";
879 } else {
880 return "$name $kid";
881 }
882 }
883}
884
885sub maybe_parens_func {
886 my $self = shift;
887 my($func, $text, $cx, $prec) = @_;
888 if ($prec <= $cx or substr($text, 0, 1) eq "(" or $self->{'parens'}) {
889 return "$func($text)";
890 } else {
891 return "$func $text";
892 }
893}
894
6e90668e
SM
895sub maybe_local {
896 my $self = shift;
9d2c6865 897 my($op, $cx, $text) = @_;
ce4e655d
RH
898 my $our_intro = ($op->name =~ /^(gv|rv2)[ash]v$/) ? OPpOUR_INTRO : 0;
899 if ($op->private & (OPpLVAL_INTRO|$our_intro)
900 and not $self->{'avoid_local'}{$$op}) {
901 my $our_local = ($op->private & OPpLVAL_INTRO) ? "local" : "our";
e8d3f51b 902 if (want_scalar($op)) {
ce4e655d 903 return "$our_local $text";
e8d3f51b 904 } else {
ce4e655d 905 return $self->maybe_parens_func("$our_local", $text, $cx, 16);
e8d3f51b 906 }
6e90668e
SM
907 } else {
908 return $text;
a798dbf2 909 }
a798dbf2
MB
910}
911
3ed82cfc
GS
912sub maybe_targmy {
913 my $self = shift;
914 my($op, $cx, $func, @args) = @_;
915 if ($op->private & OPpTARGET_MY) {
916 my $var = $self->padname($op->targ);
917 my $val = $func->($self, $op, 7, @args);
918 return $self->maybe_parens("$var = $val", $cx, 7);
919 } else {
920 return $func->($self, $op, $cx, @args);
921 }
922}
923
6e90668e
SM
924sub padname_sv {
925 my $self = shift;
926 my $targ = shift;
927 return (($self->{'curcv'}->PADLIST->ARRAY)[0]->ARRAY)[$targ];
928}
929
930sub maybe_my {
931 my $self = shift;
9d2c6865 932 my($op, $cx, $text) = @_;
4c1f658f 933 if ($op->private & OPpLVAL_INTRO and not $self->{'avoid_local'}{$$op}) {
e8d3f51b
RH
934 if (want_scalar($op)) {
935 return "my $text";
936 } else {
937 return $self->maybe_parens_func("my", $text, $cx, 16);
938 }
6e90668e
SM
939 } else {
940 return $text;
941 }
942}
943
9d2c6865
SM
944# The following OPs don't have functions:
945
946# pp_padany -- does not exist after parsing
9d2c6865
SM
947
948sub pp_enter { # see also leave
949 cluck "unexpected OP_ENTER";
950 return "XXX";
951}
952
953sub pp_pushmark { # see also list
954 cluck "unexpected OP_PUSHMARK";
955 return "XXX";
956}
957
958sub pp_leavesub { # see also deparse_sub
959 cluck "unexpected OP_LEAVESUB";
960 return "XXX";
961}
962
963sub pp_leavewrite { # see also deparse_format
964 cluck "unexpected OP_LEAVEWRITE";
965 return "XXX";
966}
967
968sub pp_method { # see also entersub
969 cluck "unexpected OP_METHOD";
970 return "XXX";
971}
972
973sub pp_regcmaybe { # see also regcomp
974 cluck "unexpected OP_REGCMAYBE";
975 return "XXX";
976}
977
90be192f
SM
978sub pp_regcreset { # see also regcomp
979 cluck "unexpected OP_REGCRESET";
980 return "XXX";
981}
982
9d2c6865
SM
983sub pp_substcont { # see also subst
984 cluck "unexpected OP_SUBSTCONT";
985 return "XXX";
986}
987
988sub pp_grepstart { # see also grepwhile
989 cluck "unexpected OP_GREPSTART";
990 return "XXX";
991}
992
993sub pp_mapstart { # see also mapwhile
994 cluck "unexpected OP_MAPSTART";
995 return "XXX";
996}
997
90c0eb26
RH
998sub pp_method_named {
999 cluck "unexpected OP_METHOD_NAMED";
1000 return "XXX";
1001}
1002
9d2c6865
SM
1003sub pp_flip { # see also flop
1004 cluck "unexpected OP_FLIP";
1005 return "XXX";
1006}
1007
1008sub pp_iter { # see also leaveloop
1009 cluck "unexpected OP_ITER";
1010 return "XXX";
1011}
1012
1013sub pp_enteriter { # see also leaveloop
1014 cluck "unexpected OP_ENTERITER";
1015 return "XXX";
1016}
1017
1018sub pp_enterloop { # see also leaveloop
1019 cluck "unexpected OP_ENTERLOOP";
1020 return "XXX";
1021}
1022
1023sub pp_leaveeval { # see also entereval
1024 cluck "unexpected OP_LEAVEEVAL";
1025 return "XXX";
1026}
1027
1028sub pp_entertry { # see also leavetry
1029 cluck "unexpected OP_ENTERTRY";
1030 return "XXX";
1031}
6e90668e 1032
ce4e655d
RH
1033# $root should be the op which represents the root of whatever
1034# we're sequencing here. If it's undefined, then we don't append
1035# any subroutine declarations to the deparsed ops, otherwise we
1036# append appropriate declarations.
58cccf98 1037sub lineseq {
ce4e655d 1038 my($self, $root, @ops) = @_;
58cccf98 1039 my($expr, @exprs);
ce4e655d
RH
1040
1041 my $out_cop = $self->{'curcop'};
1042 my $out_seq = defined($out_cop) ? $out_cop->cop_seq : undef;
1043 my $limit_seq;
1044 if (defined $root) {
1045 $limit_seq = $out_seq;
1046 my $nseq = $self->find_scope_st($root->sibling) if ${$root->sibling};
1047 $limit_seq = $nseq if !defined($limit_seq)
1048 or defined($nseq) && $nseq < $limit_seq;
1049 }
1050 $limit_seq = $self->{'limit_seq'}
1051 if defined($self->{'limit_seq'})
1052 && (!defined($limit_seq) || $self->{'limit_seq'} < $limit_seq);
1053 local $self->{'limit_seq'} = $limit_seq;
58cccf98 1054 for (my $i = 0; $i < @ops; $i++) {
6e90668e 1055 $expr = "";
58cccf98
SM
1056 if (is_state $ops[$i]) {
1057 $expr = $self->deparse($ops[$i], 0);
1058 $i++;
e99ebc55
RH
1059 if ($i > $#ops) {
1060 push @exprs, $expr;
1061 last;
1062 }
58cccf98 1063 }
c73811ab
RH
1064 if (!is_state $ops[$i] and (my $ls = $ops[$i+1]) and
1065 !null($ops[$i+1]) and $ops[$i+1]->name eq "lineseq")
58cccf98 1066 {
c73811ab
RH
1067 if ($ls->first && !null($ls->first) && is_state($ls->first)
1068 && (my $sib = $ls->first->sibling)) {
1069 if (!null($sib) && $sib->name eq "leaveloop") {
1070 push @exprs, $expr . $self->for_loop($ops[$i], 0);
1071 $i++;
1072 next;
1073 }
1074 }
6e90668e 1075 }
6ec152c3 1076 $expr .= $self->deparse($ops[$i], 0, (@ops != 1));
e99ebc55 1077 $expr =~ s/;\n?\z//;
f99a63a2 1078 push @exprs, $expr;
6e90668e 1079 }
ce4e655d
RH
1080 my $body = join(";\n", grep {length} @exprs);
1081 my $subs = "";
67fc2416 1082 if (defined $root && defined $limit_seq && !$self->{'in_format'}) {
ce4e655d
RH
1083 $subs = join "\n", $self->seq_subs($limit_seq);
1084 }
1085 return join(";\n", grep {length} $body, $subs);
6e90668e
SM
1086}
1087
58cccf98 1088sub scopeop {
ce4e655d 1089 my($real_block, $self, $op, $cx, $flags) = @_;
58cccf98
SM
1090 my $kid;
1091 my @kids;
a0405c92
RH
1092
1093 local(@$self{qw'curstash warnings hints'})
1094 = @$self{qw'curstash warnings hints'} if $real_block;
58cccf98
SM
1095 if ($real_block) {
1096 $kid = $op->first->sibling; # skip enter
1097 if (is_miniwhile($kid)) {
1098 my $top = $kid->first;
1099 my $name = $top->name;
1100 if ($name eq "and") {
1101 $name = "while";
1102 } elsif ($name eq "or") {
1103 $name = "until";
1104 } else { # no conditional -> while 1 or until 0
1105 return $self->deparse($top->first, 1) . " while 1";
1106 }
1107 my $cond = $top->first;
1108 my $body = $cond->sibling->first; # skip lineseq
1109 $cond = $self->deparse($cond, 1);
1110 $body = $self->deparse($body, 1);
1111 return "$body $name $cond";
6e90668e 1112 }
58cccf98
SM
1113 } else {
1114 $kid = $op->first;
1115 }
1116 for (; !null($kid); $kid = $kid->sibling) {
1117 push @kids, $kid;
6e90668e 1118 }
ce4e655d
RH
1119 if ($flags || $cx > 0) { # inside an expression, (a do {} while for lineseq)
1120 return "do {\n\t" . $self->lineseq($op, @kids) . "\n\b}";
9d2c6865 1121 } else {
ce4e655d 1122 my $lineseq = $self->lineseq($op, @kids);
7a9b44b9 1123 return (length ($lineseq) ? "$lineseq;" : "");
6e90668e 1124 }
6e90668e
SM
1125}
1126
ce4e655d 1127sub pp_scope { scopeop(0, @_); }
58cccf98
SM
1128sub pp_lineseq { scopeop(0, @_); }
1129sub pp_leave { scopeop(1, @_); }
9d2c6865 1130
6e90668e
SM
1131# The BEGIN {} is used here because otherwise this code isn't executed
1132# when you run B::Deparse on itself.
1133my %globalnames;
1134BEGIN { map($globalnames{$_}++, "SIG", "STDIN", "STDOUT", "STDERR", "INC",
1135 "ENV", "ARGV", "ARGVOUT", "_"); }
1136
1137sub gv_name {
1138 my $self = shift;
1139 my $gv = shift;
34a48b4b 1140Carp::confess() if $gv->isa("B::CV");
6e90668e 1141 my $stash = $gv->STASH->NAME;
d9963e60 1142 my $name = $gv->SAFENAME;
9d2c6865
SM
1143 if ($stash eq $self->{'curstash'} or $globalnames{$name}
1144 or $name =~ /^[^A-Za-z_]/)
1145 {
6e90668e
SM
1146 $stash = "";
1147 } else {
1148 $stash = $stash . "::";
a798dbf2 1149 }
083bda02
MS
1150 if ($name =~ /^(\^..|{)/) {
1151 $name = "{$name}"; # ${^WARNING_BITS}, etc and ${
6e90668e
SM
1152 }
1153 return $stash . $name;
a798dbf2
MB
1154}
1155
8510e997
RH
1156# Return the name to use for a stash variable.
1157# If a lexical with the same name is in scope, it may need to be
1158# fully-qualified.
1159sub stash_variable {
1160 my ($self, $prefix, $name) = @_;
1161
1162 return "$prefix$name" if $name =~ /::/;
1163
1164 unless ($prefix eq '$' || $prefix eq '@' ||
1165 $prefix eq '%' || $prefix eq '$#') {
1166 return "$prefix$name";
1167 }
1168
1169 my $v = ($prefix eq '$#' ? '@' : $prefix) . $name;
1170 return $prefix .$self->{'curstash'}.'::'. $name if $self->lex_in_scope($v);
1171 return "$prefix$name";
1172}
1173
1174sub lex_in_scope {
1175 my ($self, $name) = @_;
1176 $self->populate_curcvlex() if !defined $self->{'curcvlex'};
1177
6ec152c3 1178 return 0 if !defined($self->{'curcop'});
8510e997
RH
1179 my $seq = $self->{'curcop'}->cop_seq;
1180 return 0 if !exists $self->{'curcvlex'}{$name};
1181 for my $a (@{$self->{'curcvlex'}{$name}}) {
1182 my ($st, $en) = @$a;
1183 return 1 if $seq > $st && $seq <= $en;
1184 }
1185 return 0;
1186}
1187
1188sub populate_curcvlex {
1189 my $self = shift;
ce4e655d 1190 for (my $cv = $self->{'curcv'}; class($cv) eq "CV"; $cv = $cv->OUTSIDE) {
8510e997
RH
1191 my @padlist = $cv->PADLIST->ARRAY;
1192 my @ns = $padlist[0]->ARRAY;
1193
1194 for (my $i=0; $i<@ns; ++$i) {
1195 next if class($ns[$i]) eq "SPECIAL";
ce4e655d 1196 next if $ns[$i]->FLAGS & SVpad_OUR; # Skip "our" vars
0f2fe21d
RH
1197 if (class($ns[$i]) eq "PV") {
1198 # Probably that pesky lexical @_
1199 next;
1200 }
8510e997
RH
1201 my $name = $ns[$i]->PVX;
1202 my $seq_st = $ns[$i]->NVX;
1203 my $seq_en = int($ns[$i]->IVX);
1204
1205 push @{$self->{'curcvlex'}{$name}}, [$seq_st, $seq_en];
1206 }
1207 }
1208}
1209
ce4e655d
RH
1210sub find_scope_st { ((find_scope(@_))[0]); }
1211sub find_scope_en { ((find_scope(@_))[1]); }
1212
1213# Recurses down the tree, looking for pad variable introductions and COPs
1214sub find_scope {
1215 my ($self, $op, $scope_st, $scope_en) = @_;
1216Carp::cluck() if !defined $op;
1217 return ($scope_st, $scope_en) unless $op->flags & OPf_KIDS;
1218
1219 for (my $o=$op->first; $$o; $o=$o->sibling) {
1220 if ($o->name =~ /^pad.v$/ && $o->private & OPpLVAL_INTRO) {
1221 my $s = int($self->padname_sv($o->targ)->NVX);
1222 my $e = $self->padname_sv($o->targ)->IVX;
1223 $scope_st = $s if !defined($scope_st) || $s < $scope_st;
1224 $scope_en = $e if !defined($scope_en) || $e > $scope_en;
1225 }
1226 elsif (is_state($o)) {
1227 my $c = $o->cop_seq;
1228 $scope_st = $c if !defined($scope_st) || $c < $scope_st;
1229 $scope_en = $c if !defined($scope_en) || $c > $scope_en;
1230 }
1231 elsif ($o->flags & OPf_KIDS) {
1232 ($scope_st, $scope_en) =
1233 $self->find_scope($o, $scope_st, $scope_en)
34a48b4b
RH
1234 }
1235 }
ce4e655d
RH
1236
1237 return ($scope_st, $scope_en);
34a48b4b
RH
1238}
1239
1240# Returns a list of subs which should be inserted before the COP
1241sub cop_subs {
1242 my ($self, $op, $out_seq) = @_;
1243 my $seq = $op->cop_seq;
1244 # If we have nephews, then our sequence number indicates
1245 # the cop_seq of the end of some sort of scope.
1246 if (class($op->sibling) ne "NULL" && $op->sibling->flags & OPf_KIDS
ce4e655d
RH
1247 and my $nseq = $self->find_scope_st($op->sibling) ) {
1248 $seq = $nseq;
34a48b4b
RH
1249 }
1250 $seq = $out_seq if defined($out_seq) && $out_seq < $seq;
1251 return $self->seq_subs($seq);
1252}
1253
1254sub seq_subs {
1255 my ($self, $seq) = @_;
1256 my @text;
1257#push @text, "# ($seq)\n";
1258
ce4e655d 1259 return "" if !defined $seq;
34a48b4b
RH
1260 while (scalar(@{$self->{'subs_todo'}})
1261 and $seq > $self->{'subs_todo'}[0][0]) {
1262 push @text, $self->next_todo;
1263 }
1264 return @text;
1265}
1266
08c6f5ec 1267# Notice how subs and formats are inserted between statements here;
a0405c92 1268# also $[ assignments and pragmas.
6e90668e
SM
1269sub pp_nextstate {
1270 my $self = shift;
9d2c6865 1271 my($op, $cx) = @_;
34a48b4b 1272 $self->{'curcop'} = $op;
6e90668e 1273 my @text;
34a48b4b 1274 push @text, $self->cop_subs($op);
e99ebc55 1275 push @text, $op->label . ": " if $op->label;
11faa288 1276 my $stash = $op->stashpv;
6e90668e
SM
1277 if ($stash ne $self->{'curstash'}) {
1278 push @text, "package $stash;\n";
1279 $self->{'curstash'} = $stash;
1280 }
f5aa8f4e
SM
1281 if ($self->{'linenums'}) {
1282 push @text, "\f#line " . $op->line .
57843af0 1283 ' "' . $op->file, qq'"\n';
f5aa8f4e 1284 }
08c6f5ec 1285
7a9b44b9
RH
1286 if ($self->{'arybase'} != $op->arybase) {
1287 push @text, '$[ = '. $op->arybase .";\n";
1288 $self->{'arybase'} = $op->arybase;
1289 }
1290
1291 my $warnings = $op->warnings;
1292 my $warning_bits;
1293 if ($warnings->isa("B::SPECIAL") && $$warnings == 4) {
810aef70 1294 $warning_bits = $warnings::Bits{"all"} & WARN_MASK;
7a9b44b9 1295 }
e31885a0 1296 elsif ($warnings->isa("B::SPECIAL") && $$warnings == 5) {
810aef70 1297 $warning_bits = $warnings::NONE;
7a9b44b9 1298 }
e31885a0
RH
1299 elsif ($warnings->isa("B::SPECIAL")) {
1300 $warning_bits = undef;
1301 }
7a9b44b9 1302 else {
34a48b4b 1303 $warning_bits = $warnings->PV & WARN_MASK;
7a9b44b9
RH
1304 }
1305
e31885a0
RH
1306 if (defined ($warning_bits) and
1307 !defined($self->{warnings}) || $self->{'warnings'} ne $warning_bits) {
08c6f5ec 1308 push @text, declare_warnings($self->{'warnings'}, $warning_bits);
7a9b44b9
RH
1309 $self->{'warnings'} = $warning_bits;
1310 }
1311
a0405c92
RH
1312 if ($self->{'hints'} != $op->private) {
1313 push @text, declare_hints($self->{'hints'}, $op->private);
1314 $self->{'hints'} = $op->private;
1315 }
1316
6e90668e
SM
1317 return join("", @text);
1318}
1319
08c6f5ec
RH
1320sub declare_warnings {
1321 my ($from, $to) = @_;
6ec152c3 1322 if (($to & WARN_MASK) eq warnings::bits("all")) {
a0405c92
RH
1323 return "use warnings;\n";
1324 }
6ec152c3 1325 elsif (($to & WARN_MASK) eq "\0"x length($to)) {
a0405c92
RH
1326 return "no warnings;\n";
1327 }
1328 return "BEGIN {\${^WARNING_BITS} = ".cstring($to)."}\n";
1329}
1330
1331sub declare_hints {
1332 my ($from, $to) = @_;
a0035eb8
RH
1333 my $use = $to & ~$from;
1334 my $no = $from & ~$to;
1335 my $decls = "";
1336 for my $pragma (hint_pragmas($use)) {
1337 $decls .= "use $pragma;\n";
1338 }
1339 for my $pragma (hint_pragmas($no)) {
1340 $decls .= "no $pragma;\n";
1341 }
1342 return $decls;
1343}
1344
1345sub hint_pragmas {
1346 my ($bits) = @_;
1347 my @pragmas;
1348 push @pragmas, "integer" if $bits & 0x1;
1349 push @pragmas, "strict 'refs'" if $bits & 0x2;
1350 push @pragmas, "bytes" if $bits & 0x8;
1351 return @pragmas;
08c6f5ec
RH
1352}
1353
6e90668e 1354sub pp_dbstate { pp_nextstate(@_) }
3f872cb9 1355sub pp_setstate { pp_nextstate(@_) }
6e90668e
SM
1356
1357sub pp_unstack { return "" } # see also leaveloop
1358
1359sub baseop {
1360 my $self = shift;
9d2c6865 1361 my($op, $cx, $name) = @_;
6e90668e
SM
1362 return $name;
1363}
1364
e99ebc55
RH
1365sub pp_stub {
1366 my $self = shift;
1367 my($op, $cx, $name) = @_;
1368 if ($cx) {
1369 return "()";
1370 }
1371 else {
1372 return "();";
1373 }
1374}
6e90668e
SM
1375sub pp_wantarray { baseop(@_, "wantarray") }
1376sub pp_fork { baseop(@_, "fork") }
3ed82cfc
GS
1377sub pp_wait { maybe_targmy(@_, \&baseop, "wait") }
1378sub pp_getppid { maybe_targmy(@_, \&baseop, "getppid") }
1379sub pp_time { maybe_targmy(@_, \&baseop, "time") }
6e90668e
SM
1380sub pp_tms { baseop(@_, "times") }
1381sub pp_ghostent { baseop(@_, "gethostent") }
1382sub pp_gnetent { baseop(@_, "getnetent") }
1383sub pp_gprotoent { baseop(@_, "getprotoent") }
1384sub pp_gservent { baseop(@_, "getservent") }
1385sub pp_ehostent { baseop(@_, "endhostent") }
1386sub pp_enetent { baseop(@_, "endnetent") }
1387sub pp_eprotoent { baseop(@_, "endprotoent") }
1388sub pp_eservent { baseop(@_, "endservent") }
1389sub pp_gpwent { baseop(@_, "getpwent") }
1390sub pp_spwent { baseop(@_, "setpwent") }
1391sub pp_epwent { baseop(@_, "endpwent") }
1392sub pp_ggrent { baseop(@_, "getgrent") }
1393sub pp_sgrent { baseop(@_, "setgrent") }
1394sub pp_egrent { baseop(@_, "endgrent") }
1395sub pp_getlogin { baseop(@_, "getlogin") }
1396
1397sub POSTFIX () { 1 }
1398
9d2c6865
SM
1399# I couldn't think of a good short name, but this is the category of
1400# symbolic unary operators with interesting precedence
1401
1402sub pfixop {
1403 my $self = shift;
1404 my($op, $cx, $name, $prec, $flags) = (@_, 0);
1405 my $kid = $op->first;
1406 $kid = $self->deparse($kid, $prec);
1407 return $self->maybe_parens(($flags & POSTFIX) ? "$kid$name" : "$name$kid",
1408 $cx, $prec);
1409}
1410
1411sub pp_preinc { pfixop(@_, "++", 23) }
1412sub pp_predec { pfixop(@_, "--", 23) }
3ed82cfc
GS
1413sub pp_postinc { maybe_targmy(@_, \&pfixop, "++", 23, POSTFIX) }
1414sub pp_postdec { maybe_targmy(@_, \&pfixop, "--", 23, POSTFIX) }
9d2c6865
SM
1415sub pp_i_preinc { pfixop(@_, "++", 23) }
1416sub pp_i_predec { pfixop(@_, "--", 23) }
3ed82cfc
GS
1417sub pp_i_postinc { maybe_targmy(@_, \&pfixop, "++", 23, POSTFIX) }
1418sub pp_i_postdec { maybe_targmy(@_, \&pfixop, "--", 23, POSTFIX) }
68cc8748 1419sub pp_complement { maybe_targmy(@_, \&pfixop, "~", 21) }
9d2c6865 1420
3ed82cfc
GS
1421sub pp_negate { maybe_targmy(@_, \&real_negate) }
1422sub real_negate {
9d2c6865
SM
1423 my $self = shift;
1424 my($op, $cx) = @_;
3f872cb9 1425 if ($op->first->name =~ /^(i_)?negate$/) {
9d2c6865
SM
1426 # avoid --$x
1427 $self->pfixop($op, $cx, "-", 21.5);
1428 } else {
1429 $self->pfixop($op, $cx, "-", 21);
1430 }
1431}
1432sub pp_i_negate { pp_negate(@_) }
1433
1434sub pp_not {
1435 my $self = shift;
1436 my($op, $cx) = @_;
1437 if ($cx <= 4) {
1438 $self->pfixop($op, $cx, "not ", 4);
1439 } else {
1440 $self->pfixop($op, $cx, "!", 21);
1441 }
1442}
1443
6e90668e
SM
1444sub unop {
1445 my $self = shift;
f4a44678 1446 my($op, $cx, $name) = @_;
6e90668e 1447 my $kid;
9d2c6865 1448 if ($op->flags & OPf_KIDS) {
6e90668e 1449 $kid = $op->first;
e31885a0
RH
1450 if (defined prototype("CORE::$name")
1451 && prototype("CORE::$name") =~ /^;?\*/
1452 && $kid->name eq "rv2gv") {
1453 $kid = $kid->first;
1454 }
1455
9d2c6865 1456 return $self->maybe_parens_unop($name, $kid, $cx);
6e90668e 1457 } else {
9d2c6865 1458 return $name . ($op->flags & OPf_SPECIAL ? "()" : "");
6e90668e 1459 }
6e90668e
SM
1460}
1461
3ed82cfc
GS
1462sub pp_chop { maybe_targmy(@_, \&unop, "chop") }
1463sub pp_chomp { maybe_targmy(@_, \&unop, "chomp") }
1464sub pp_schop { maybe_targmy(@_, \&unop, "chop") }
1465sub pp_schomp { maybe_targmy(@_, \&unop, "chomp") }
6e90668e
SM
1466sub pp_defined { unop(@_, "defined") }
1467sub pp_undef { unop(@_, "undef") }
1468sub pp_study { unop(@_, "study") }
6e90668e
SM
1469sub pp_ref { unop(@_, "ref") }
1470sub pp_pos { maybe_local(@_, unop(@_, "pos")) }
1471
3ed82cfc
GS
1472sub pp_sin { maybe_targmy(@_, \&unop, "sin") }
1473sub pp_cos { maybe_targmy(@_, \&unop, "cos") }
1474sub pp_rand { maybe_targmy(@_, \&unop, "rand") }
6e90668e 1475sub pp_srand { unop(@_, "srand") }
3ed82cfc
GS
1476sub pp_exp { maybe_targmy(@_, \&unop, "exp") }
1477sub pp_log { maybe_targmy(@_, \&unop, "log") }
1478sub pp_sqrt { maybe_targmy(@_, \&unop, "sqrt") }
1479sub pp_int { maybe_targmy(@_, \&unop, "int") }
1480sub pp_hex { maybe_targmy(@_, \&unop, "hex") }
1481sub pp_oct { maybe_targmy(@_, \&unop, "oct") }
1482sub pp_abs { maybe_targmy(@_, \&unop, "abs") }
1483
1484sub pp_length { maybe_targmy(@_, \&unop, "length") }
1485sub pp_ord { maybe_targmy(@_, \&unop, "ord") }
1486sub pp_chr { maybe_targmy(@_, \&unop, "chr") }
6e90668e
SM
1487
1488sub pp_each { unop(@_, "each") }
1489sub pp_values { unop(@_, "values") }
1490sub pp_keys { unop(@_, "keys") }
1491sub pp_pop { unop(@_, "pop") }
1492sub pp_shift { unop(@_, "shift") }
1493
1494sub pp_caller { unop(@_, "caller") }
1495sub pp_reset { unop(@_, "reset") }
1496sub pp_exit { unop(@_, "exit") }
1497sub pp_prototype { unop(@_, "prototype") }
1498
1499sub pp_close { unop(@_, "close") }
1500sub pp_fileno { unop(@_, "fileno") }
1501sub pp_umask { unop(@_, "umask") }
6e90668e
SM
1502sub pp_untie { unop(@_, "untie") }
1503sub pp_tied { unop(@_, "tied") }
1504sub pp_dbmclose { unop(@_, "dbmclose") }
1505sub pp_getc { unop(@_, "getc") }
1506sub pp_eof { unop(@_, "eof") }
1507sub pp_tell { unop(@_, "tell") }
1508sub pp_getsockname { unop(@_, "getsockname") }
1509sub pp_getpeername { unop(@_, "getpeername") }
1510
3ed82cfc
GS
1511sub pp_chdir { maybe_targmy(@_, \&unop, "chdir") }
1512sub pp_chroot { maybe_targmy(@_, \&unop, "chroot") }
6e90668e 1513sub pp_readlink { unop(@_, "readlink") }
3ed82cfc 1514sub pp_rmdir { maybe_targmy(@_, \&unop, "rmdir") }
6e90668e
SM
1515sub pp_readdir { unop(@_, "readdir") }
1516sub pp_telldir { unop(@_, "telldir") }
1517sub pp_rewinddir { unop(@_, "rewinddir") }
1518sub pp_closedir { unop(@_, "closedir") }
3ed82cfc 1519sub pp_getpgrp { maybe_targmy(@_, \&unop, "getpgrp") }
6e90668e
SM
1520sub pp_localtime { unop(@_, "localtime") }
1521sub pp_gmtime { unop(@_, "gmtime") }
1522sub pp_alarm { unop(@_, "alarm") }
3ed82cfc 1523sub pp_sleep { maybe_targmy(@_, \&unop, "sleep") }
6e90668e
SM
1524
1525sub pp_dofile { unop(@_, "do") }
1526sub pp_entereval { unop(@_, "eval") }
1527
1528sub pp_ghbyname { unop(@_, "gethostbyname") }
1529sub pp_gnbyname { unop(@_, "getnetbyname") }
1530sub pp_gpbyname { unop(@_, "getprotobyname") }
1531sub pp_shostent { unop(@_, "sethostent") }
1532sub pp_snetent { unop(@_, "setnetent") }
1533sub pp_sprotoent { unop(@_, "setprotoent") }
1534sub pp_sservent { unop(@_, "setservent") }
1535sub pp_gpwnam { unop(@_, "getpwnam") }
1536sub pp_gpwuid { unop(@_, "getpwuid") }
1537sub pp_ggrnam { unop(@_, "getgrnam") }
1538sub pp_ggrgid { unop(@_, "getgrgid") }
1539
1540sub pp_lock { unop(@_, "lock") }
1541
1542sub pp_exists {
1543 my $self = shift;
9d2c6865 1544 my($op, $cx) = @_;
34a48b4b
RH
1545 my $arg;
1546 if ($op->private & OPpEXISTS_SUB) {
1547 # Checking for the existence of a subroutine
1548 return $self->maybe_parens_func("exists",
1549 $self->pp_rv2cv($op->first, 16), $cx, 16);
1550 }
1551 if ($op->flags & OPf_SPECIAL) {
1552 # Array element, not hash element
1553 return $self->maybe_parens_func("exists",
1554 $self->pp_aelem($op->first, 16), $cx, 16);
1555 }
9d2c6865
SM
1556 return $self->maybe_parens_func("exists", $self->pp_helem($op->first, 16),
1557 $cx, 16);
6e90668e
SM
1558}
1559
6e90668e
SM
1560sub pp_delete {
1561 my $self = shift;
9d2c6865 1562 my($op, $cx) = @_;
6e90668e
SM
1563 my $arg;
1564 if ($op->private & OPpSLICE) {
34a48b4b
RH
1565 if ($op->flags & OPf_SPECIAL) {
1566 # Deleting from an array, not a hash
1567 return $self->maybe_parens_func("delete",
1568 $self->pp_aslice($op->first, 16),
1569 $cx, 16);
1570 }
9d2c6865
SM
1571 return $self->maybe_parens_func("delete",
1572 $self->pp_hslice($op->first, 16),
1573 $cx, 16);
6e90668e 1574 } else {
34a48b4b
RH
1575 if ($op->flags & OPf_SPECIAL) {
1576 # Deleting from an array, not a hash
1577 return $self->maybe_parens_func("delete",
1578 $self->pp_aelem($op->first, 16),
1579 $cx, 16);
1580 }
9d2c6865
SM
1581 return $self->maybe_parens_func("delete",
1582 $self->pp_helem($op->first, 16),
1583 $cx, 16);
6e90668e 1584 }
6e90668e
SM
1585}
1586
6e90668e
SM
1587sub pp_require {
1588 my $self = shift;
9d2c6865 1589 my($op, $cx) = @_;
3f872cb9 1590 if (class($op) eq "UNOP" and $op->first->name eq "const"
4c1f658f 1591 and $op->first->private & OPpCONST_BARE)
6e90668e 1592 {
18228111 1593 my $name = $self->const_sv($op->first)->PV;
6e90668e
SM
1594 $name =~ s[/][::]g;
1595 $name =~ s/\.pm//g;
34a48b4b 1596 return "require $name";
6e90668e 1597 } else {
9d2c6865 1598 $self->unop($op, $cx, "require");
6e90668e
SM
1599 }
1600}
1601
9d2c6865
SM
1602sub pp_scalar {
1603 my $self = shift;
1604 my($op, $cv) = @_;
1605 my $kid = $op->first;
1606 if (not null $kid->sibling) {
1607 # XXX Was a here-doc
1608 return $self->dquote($op);
1609 }
1610 $self->unop(@_, "scalar");
1611}
1612
1613
6e90668e
SM
1614sub padval {
1615 my $self = shift;
1616 my $targ = shift;
18228111 1617 #cluck "curcv was undef" unless $self->{curcv};
6e90668e
SM
1618 return (($self->{'curcv'}->PADLIST->ARRAY)[1]->ARRAY)[$targ];
1619}
1620
1621sub pp_refgen {
1622 my $self = shift;
9d2c6865 1623 my($op, $cx) = @_;
6e90668e 1624 my $kid = $op->first;
3f872cb9 1625 if ($kid->name eq "null") {
6e90668e 1626 $kid = $kid->first;
3f872cb9
GS
1627 if ($kid->name eq "anonlist" || $kid->name eq "anonhash") {
1628 my($pre, $post) = @{{"anonlist" => ["[","]"],
1629 "anonhash" => ["{","}"]}->{$kid->name}};
6e90668e
SM
1630 my($expr, @exprs);
1631 $kid = $kid->first->sibling; # skip pushmark
1632 for (; !null($kid); $kid = $kid->sibling) {
9d2c6865 1633 $expr = $self->deparse($kid, 6);
6e90668e
SM
1634 push @exprs, $expr;
1635 }
1636 return $pre . join(", ", @exprs) . $post;
1637 } elsif (!null($kid->sibling) and
3f872cb9 1638 $kid->sibling->name eq "anoncode") {
6e90668e
SM
1639 return "sub " .
1640 $self->deparse_sub($self->padval($kid->sibling->targ));
3f872cb9
GS
1641 } elsif ($kid->name eq "pushmark") {
1642 my $sib_name = $kid->sibling->name;
1643 if ($sib_name =~ /^(pad|rv2)[ah]v$/
c8c62db7
AD
1644 and not $kid->sibling->flags & OPf_REF)
1645 {
1646 # The @a in \(@a) isn't in ref context, but only when the
1647 # parens are there.
1648 return "\\(" . $self->deparse($kid->sibling, 1) . ")";
3f872cb9 1649 } elsif ($sib_name eq 'entersub') {
c8c62db7
AD
1650 my $text = $self->deparse($kid->sibling, 1);
1651 # Always show parens for \(&func()), but only with -p otherwise
1652 $text = "($text)" if $self->{'parens'}
1653 or $kid->sibling->private & OPpENTERSUB_AMPER;
1654 return "\\$text";
1655 }
1656 }
6e90668e 1657 }
9d2c6865 1658 $self->pfixop($op, $cx, "\\", 20);
6e90668e
SM
1659}
1660
1661sub pp_srefgen { pp_refgen(@_) }
1662
1663sub pp_readline {
1664 my $self = shift;
9d2c6865 1665 my($op, $cx) = @_;
6e90668e 1666 my $kid = $op->first;
3f872cb9 1667 $kid = $kid->first if $kid->name eq "rv2gv"; # <$fh>
e31885a0
RH
1668 return "<" . $self->deparse($kid, 1) . ">" if is_scalar($kid);
1669 return $self->unop($op, $cx, "readline");
6e90668e
SM
1670}
1671
ad8caead
RGS
1672sub pp_rcatline {
1673 my $self = shift;
1674 my($op) = @_;
1675 return "<" . $self->gv_name($op->gv) . ">";
1676}
1677
bd0865ec
GS
1678# Unary operators that can occur as pseudo-listops inside double quotes
1679sub dq_unop {
1680 my $self = shift;
1681 my($op, $cx, $name, $prec, $flags) = (@_, 0, 0);
1682 my $kid;
1683 if ($op->flags & OPf_KIDS) {
1684 $kid = $op->first;
1685 # If there's more than one kid, the first is an ex-pushmark.
1686 $kid = $kid->sibling if not null $kid->sibling;
1687 return $self->maybe_parens_unop($name, $kid, $cx);
1688 } else {
1689 return $name . ($op->flags & OPf_SPECIAL ? "()" : "");
1690 }
1691}
1692
1693sub pp_ucfirst { dq_unop(@_, "ucfirst") }
1694sub pp_lcfirst { dq_unop(@_, "lcfirst") }
1695sub pp_uc { dq_unop(@_, "uc") }
1696sub pp_lc { dq_unop(@_, "lc") }
3ed82cfc 1697sub pp_quotemeta { maybe_targmy(@_, \&dq_unop, "quotemeta") }
bd0865ec 1698
6e90668e
SM
1699sub loopex {
1700 my $self = shift;
9d2c6865 1701 my ($op, $cx, $name) = @_;
6e90668e 1702 if (class($op) eq "PVOP") {
9d2c6865
SM
1703 return "$name " . $op->pv;
1704 } elsif (class($op) eq "OP") {
1705 return $name;
6e90668e 1706 } elsif (class($op) eq "UNOP") {
9d2c6865
SM
1707 # Note -- loop exits are actually exempt from the
1708 # looks-like-a-func rule, but a few extra parens won't hurt
1709 return $self->maybe_parens_unop($name, $op->first, $cx);
6e90668e 1710 }
6e90668e
SM
1711}
1712
1713sub pp_last { loopex(@_, "last") }
1714sub pp_next { loopex(@_, "next") }
1715sub pp_redo { loopex(@_, "redo") }
1716sub pp_goto { loopex(@_, "goto") }
1717sub pp_dump { loopex(@_, "dump") }
1718
1719sub ftst {
1720 my $self = shift;
9d2c6865 1721 my($op, $cx, $name) = @_;
6e90668e 1722 if (class($op) eq "UNOP") {
9d2c6865
SM
1723 # Genuine `-X' filetests are exempt from the LLAFR, but not
1724 # l?stat(); for the sake of clarity, give'em all parens
1725 return $self->maybe_parens_unop($name, $op->first, $cx);
7934575e 1726 } elsif (class($op) eq "SVOP") {
9d2c6865 1727 return $self->maybe_parens_func($name, $self->pp_gv($op, 1), $cx, 16);
6e90668e 1728 } else { # I don't think baseop filetests ever survive ck_ftst, but...
9d2c6865 1729 return $name;
6e90668e 1730 }
6e90668e
SM
1731}
1732
1733sub pp_lstat { ftst(@_, "lstat") }
1734sub pp_stat { ftst(@_, "stat") }
1735sub pp_ftrread { ftst(@_, "-R") }
1736sub pp_ftrwrite { ftst(@_, "-W") }
1737sub pp_ftrexec { ftst(@_, "-X") }
1738sub pp_fteread { ftst(@_, "-r") }
e31885a0
RH
1739sub pp_ftewrite { ftst(@_, "-w") }
1740sub pp_fteexec { ftst(@_, "-x") }
6e90668e
SM
1741sub pp_ftis { ftst(@_, "-e") }
1742sub pp_fteowned { ftst(@_, "-O") }
1743sub pp_ftrowned { ftst(@_, "-o") }
1744sub pp_ftzero { ftst(@_, "-z") }
1745sub pp_ftsize { ftst(@_, "-s") }
1746sub pp_ftmtime { ftst(@_, "-M") }
1747sub pp_ftatime { ftst(@_, "-A") }
1748sub pp_ftctime { ftst(@_, "-C") }
1749sub pp_ftsock { ftst(@_, "-S") }
1750sub pp_ftchr { ftst(@_, "-c") }
1751sub pp_ftblk { ftst(@_, "-b") }
1752sub pp_ftfile { ftst(@_, "-f") }
1753sub pp_ftdir { ftst(@_, "-d") }
1754sub pp_ftpipe { ftst(@_, "-p") }
1755sub pp_ftlink { ftst(@_, "-l") }
1756sub pp_ftsuid { ftst(@_, "-u") }
1757sub pp_ftsgid { ftst(@_, "-g") }
1758sub pp_ftsvtx { ftst(@_, "-k") }
1759sub pp_fttty { ftst(@_, "-t") }
1760sub pp_fttext { ftst(@_, "-T") }
1761sub pp_ftbinary { ftst(@_, "-B") }
1762
a798dbf2 1763sub SWAP_CHILDREN () { 1 }
6e90668e 1764sub ASSIGN () { 2 } # has OP= variant
7013e6ae 1765sub LIST_CONTEXT () { 4 } # Assignment is in list context
6e90668e 1766
9d2c6865
SM
1767my(%left, %right);
1768
1769sub assoc_class {
1770 my $op = shift;
3f872cb9
GS
1771 my $name = $op->name;
1772 if ($name eq "concat" and $op->first->name eq "concat") {
9d2c6865 1773 # avoid spurious `=' -- see comment in pp_concat
3f872cb9 1774 return "concat";
9d2c6865 1775 }
3f872cb9
GS
1776 if ($name eq "null" and class($op) eq "UNOP"
1777 and $op->first->name =~ /^(and|x?or)$/
9d2c6865
SM
1778 and null $op->first->sibling)
1779 {
1780 # Like all conditional constructs, OP_ANDs and OP_ORs are topped
1781 # with a null that's used as the common end point of the two
1782 # flows of control. For precedence purposes, ignore it.
1783 # (COND_EXPRs have these too, but we don't bother with
1784 # their associativity).
1785 return assoc_class($op->first);
1786 }
1787 return $name . ($op->flags & OPf_STACKED ? "=" : "");
1788}
1789
1790# Left associative operators, like `+', for which
1791# $a + $b + $c is equivalent to ($a + $b) + $c
1792
1793BEGIN {
3f872cb9
GS
1794 %left = ('multiply' => 19, 'i_multiply' => 19,
1795 'divide' => 19, 'i_divide' => 19,
1796 'modulo' => 19, 'i_modulo' => 19,
1797 'repeat' => 19,
1798 'add' => 18, 'i_add' => 18,
1799 'subtract' => 18, 'i_subtract' => 18,
1800 'concat' => 18,
1801 'left_shift' => 17, 'right_shift' => 17,
1802 'bit_and' => 13,
1803 'bit_or' => 12, 'bit_xor' => 12,
1804 'and' => 3,
1805 'or' => 2, 'xor' => 2,
9d2c6865
SM
1806 );
1807}
1808
1809sub deparse_binop_left {
1810 my $self = shift;
1811 my($op, $left, $prec) = @_;
58231d39 1812 if ($left{assoc_class($op)} && $left{assoc_class($left)}
9d2c6865
SM
1813 and $left{assoc_class($op)} == $left{assoc_class($left)})
1814 {
1815 return $self->deparse($left, $prec - .00001);
1816 } else {
1817 return $self->deparse($left, $prec);
1818 }
1819}
1820
1821# Right associative operators, like `=', for which
1822# $a = $b = $c is equivalent to $a = ($b = $c)
1823
1824BEGIN {
3f872cb9
GS
1825 %right = ('pow' => 22,
1826 'sassign=' => 7, 'aassign=' => 7,
1827 'multiply=' => 7, 'i_multiply=' => 7,
1828 'divide=' => 7, 'i_divide=' => 7,
1829 'modulo=' => 7, 'i_modulo=' => 7,
1830 'repeat=' => 7,
1831 'add=' => 7, 'i_add=' => 7,
1832 'subtract=' => 7, 'i_subtract=' => 7,
1833 'concat=' => 7,
1834 'left_shift=' => 7, 'right_shift=' => 7,
1835 'bit_and=' => 7,
1836 'bit_or=' => 7, 'bit_xor=' => 7,
1837 'andassign' => 7,
1838 'orassign' => 7,
9d2c6865
SM
1839 );
1840}
1841
1842sub deparse_binop_right {
1843 my $self = shift;
1844 my($op, $right, $prec) = @_;
58231d39 1845 if ($right{assoc_class($op)} && $right{assoc_class($right)}
9d2c6865
SM
1846 and $right{assoc_class($op)} == $right{assoc_class($right)})
1847 {
1848 return $self->deparse($right, $prec - .00001);
1849 } else {
1850 return $self->deparse($right, $prec);
1851 }
1852}
1853
a798dbf2 1854sub binop {
6e90668e 1855 my $self = shift;
9d2c6865 1856 my ($op, $cx, $opname, $prec, $flags) = (@_, 0);
a798dbf2
MB
1857 my $left = $op->first;
1858 my $right = $op->last;
9d2c6865
SM
1859 my $eq = "";
1860 if ($op->flags & OPf_STACKED && $flags & ASSIGN) {
1861 $eq = "=";
1862 $prec = 7;
1863 }
a798dbf2
MB
1864 if ($flags & SWAP_CHILDREN) {
1865 ($left, $right) = ($right, $left);
1866 }
9d2c6865 1867 $left = $self->deparse_binop_left($op, $left, $prec);
90c0eb26
RH
1868 $left = "($left)" if $flags & LIST_CONTEXT
1869 && $left !~ /^(my|our|local|)[\@\(]/;
9d2c6865
SM
1870 $right = $self->deparse_binop_right($op, $right, $prec);
1871 return $self->maybe_parens("$left $opname$eq $right", $cx, $prec);
1872}
1873
3ed82cfc
GS
1874sub pp_add { maybe_targmy(@_, \&binop, "+", 18, ASSIGN) }
1875sub pp_multiply { maybe_targmy(@_, \&binop, "*", 19, ASSIGN) }
1876sub pp_subtract { maybe_targmy(@_, \&binop, "-",18, ASSIGN) }
1877sub pp_divide { maybe_targmy(@_, \&binop, "/", 19, ASSIGN) }
1878sub pp_modulo { maybe_targmy(@_, \&binop, "%", 19, ASSIGN) }
1879sub pp_i_add { maybe_targmy(@_, \&binop, "+", 18, ASSIGN) }
1880sub pp_i_multiply { maybe_targmy(@_, \&binop, "*", 19, ASSIGN) }
1881sub pp_i_subtract { maybe_targmy(@_, \&binop, "-", 18, ASSIGN) }
1882sub pp_i_divide { maybe_targmy(@_, \&binop, "/", 19, ASSIGN) }
1883sub pp_i_modulo { maybe_targmy(@_, \&binop, "%", 19, ASSIGN) }
1884sub pp_pow { maybe_targmy(@_, \&binop, "**", 22, ASSIGN) }
1885
1886sub pp_left_shift { maybe_targmy(@_, \&binop, "<<", 17, ASSIGN) }
1887sub pp_right_shift { maybe_targmy(@_, \&binop, ">>", 17, ASSIGN) }
1888sub pp_bit_and { maybe_targmy(@_, \&binop, "&", 13, ASSIGN) }
1889sub pp_bit_or { maybe_targmy(@_, \&binop, "|", 12, ASSIGN) }
1890sub pp_bit_xor { maybe_targmy(@_, \&binop, "^", 12, ASSIGN) }
9d2c6865
SM
1891
1892sub pp_eq { binop(@_, "==", 14) }
1893sub pp_ne { binop(@_, "!=", 14) }
1894sub pp_lt { binop(@_, "<", 15) }
1895sub pp_gt { binop(@_, ">", 15) }
1896sub pp_ge { binop(@_, ">=", 15) }
1897sub pp_le { binop(@_, "<=", 15) }
1898sub pp_ncmp { binop(@_, "<=>", 14) }
1899sub pp_i_eq { binop(@_, "==", 14) }
1900sub pp_i_ne { binop(@_, "!=", 14) }
1901sub pp_i_lt { binop(@_, "<", 15) }
1902sub pp_i_gt { binop(@_, ">", 15) }
1903sub pp_i_ge { binop(@_, ">=", 15) }
1904sub pp_i_le { binop(@_, "<=", 15) }
1905sub pp_i_ncmp { binop(@_, "<=>", 14) }
1906
1907sub pp_seq { binop(@_, "eq", 14) }
1908sub pp_sne { binop(@_, "ne", 14) }
1909sub pp_slt { binop(@_, "lt", 15) }
1910sub pp_sgt { binop(@_, "gt", 15) }
1911sub pp_sge { binop(@_, "ge", 15) }
1912sub pp_sle { binop(@_, "le", 15) }
1913sub pp_scmp { binop(@_, "cmp", 14) }
1914
1915sub pp_sassign { binop(@_, "=", 7, SWAP_CHILDREN) }
7013e6ae 1916sub pp_aassign { binop(@_, "=", 7, SWAP_CHILDREN | LIST_CONTEXT) }
6e90668e
SM
1917
1918# `.' is special because concats-of-concats are optimized to save copying
1919# by making all but the first concat stacked. The effect is as if the
1920# programmer had written `($a . $b) .= $c', except legal.
3ed82cfc
GS
1921sub pp_concat { maybe_targmy(@_, \&real_concat) }
1922sub real_concat {
6e90668e 1923 my $self = shift;
9d2c6865 1924 my($op, $cx) = @_;
6e90668e
SM
1925 my $left = $op->first;
1926 my $right = $op->last;
1927 my $eq = "";
9d2c6865 1928 my $prec = 18;
3f872cb9 1929 if ($op->flags & OPf_STACKED and $op->first->name ne "concat") {
6e90668e 1930 $eq = "=";
9d2c6865 1931 $prec = 7;
6e90668e 1932 }
9d2c6865
SM
1933 $left = $self->deparse_binop_left($op, $left, $prec);
1934 $right = $self->deparse_binop_right($op, $right, $prec);
1935 return $self->maybe_parens("$left .$eq $right", $cx, $prec);
6e90668e
SM
1936}
1937
1938# `x' is weird when the left arg is a list
1939sub pp_repeat {
1940 my $self = shift;
9d2c6865 1941 my($op, $cx) = @_;
6e90668e
SM
1942 my $left = $op->first;
1943 my $right = $op->last;
9d2c6865
SM
1944 my $eq = "";
1945 my $prec = 19;
1946 if ($op->flags & OPf_STACKED) {
1947 $eq = "=";
1948 $prec = 7;
1949 }
6e90668e
SM
1950 if (null($right)) { # list repeat; count is inside left-side ex-list
1951 my $kid = $left->first->sibling; # skip pushmark
1952 my @exprs;
1953 for (; !null($kid->sibling); $kid = $kid->sibling) {
9d2c6865 1954 push @exprs, $self->deparse($kid, 6);
6e90668e
SM
1955 }
1956 $right = $kid;
1957 $left = "(" . join(", ", @exprs). ")";
1958 } else {
9d2c6865 1959 $left = $self->deparse_binop_left($op, $left, $prec);
6e90668e 1960 }
9d2c6865
SM
1961 $right = $self->deparse_binop_right($op, $right, $prec);
1962 return $self->maybe_parens("$left x$eq $right", $cx, $prec);
6e90668e
SM
1963}
1964
1965sub range {
1966 my $self = shift;
9d2c6865 1967 my ($op, $cx, $type) = @_;
6e90668e
SM
1968 my $left = $op->first;
1969 my $right = $left->sibling;
9d2c6865
SM
1970 $left = $self->deparse($left, 9);
1971 $right = $self->deparse($right, 9);
1972 return $self->maybe_parens("$left $type $right", $cx, 9);
6e90668e
SM
1973}
1974
1975sub pp_flop {
1976 my $self = shift;
9d2c6865 1977 my($op, $cx) = @_;
6e90668e
SM
1978 my $flip = $op->first;
1979 my $type = ($flip->flags & OPf_SPECIAL) ? "..." : "..";
9d2c6865 1980 return $self->range($flip->first, $cx, $type);
6e90668e
SM
1981}
1982
1983# one-line while/until is handled in pp_leave
1984
1985sub logop {
1986 my $self = shift;
9d2c6865 1987 my ($op, $cx, $lowop, $lowprec, $highop, $highprec, $blockname) = @_;
6e90668e
SM
1988 my $left = $op->first;
1989 my $right = $op->first->sibling;
58cccf98
SM
1990 if ($cx == 0 and is_scope($right) and $blockname
1991 and $self->{'expand'} < 7)
1992 { # if ($a) {$b}
9d2c6865
SM
1993 $left = $self->deparse($left, 1);
1994 $right = $self->deparse($right, 0);
1995 return "$blockname ($left) {\n\t$right\n\b}\cK";
58cccf98
SM
1996 } elsif ($cx == 0 and $blockname and not $self->{'parens'}
1997 and $self->{'expand'} < 7) { # $b if $a
9d2c6865
SM
1998 $right = $self->deparse($right, 1);
1999 $left = $self->deparse($left, 1);
2000 return "$right $blockname $left";
2001 } elsif ($cx > $lowprec and $highop) { # $a && $b
2002 $left = $self->deparse_binop_left($op, $left, $highprec);
2003 $right = $self->deparse_binop_right($op, $right, $highprec);
2004 return $self->maybe_parens("$left $highop $right", $cx, $highprec);
2005 } else { # $a and $b
2006 $left = $self->deparse_binop_left($op, $left, $lowprec);
2007 $right = $self->deparse_binop_right($op, $right, $lowprec);
2008 return $self->maybe_parens("$left $lowop $right", $cx, $lowprec);
2009 }
2010}
2011
2012sub pp_and { logop(@_, "and", 3, "&&", 11, "if") }
f4a44678 2013sub pp_or { logop(@_, "or", 2, "||", 10, "unless") }
3ed82cfc
GS
2014
2015# xor is syntactically a logop, but it's really a binop (contrary to
2016# old versions of opcode.pl). Syntax is what matters here.
9d2c6865 2017sub pp_xor { logop(@_, "xor", 2, "", 0, "") }
6e90668e
SM
2018
2019sub logassignop {
2020 my $self = shift;
9d2c6865 2021 my ($op, $cx, $opname) = @_;
6e90668e
SM
2022 my $left = $op->first;
2023 my $right = $op->first->sibling->first; # skip sassign
9d2c6865
SM
2024 $left = $self->deparse($left, 7);
2025 $right = $self->deparse($right, 7);
2026 return $self->maybe_parens("$left $opname $right", $cx, 7);
a798dbf2
MB
2027}
2028
6e90668e
SM
2029sub pp_andassign { logassignop(@_, "&&=") }
2030sub pp_orassign { logassignop(@_, "||=") }
2031
2032sub listop {
2033 my $self = shift;
9d2c6865
SM
2034 my($op, $cx, $name) = @_;
2035 my(@exprs);
2036 my $parens = ($cx >= 5) || $self->{'parens'};
2037 my $kid = $op->first->sibling;
2038 return $name if null $kid;
e31885a0
RH
2039 my $first;
2040 if (defined prototype("CORE::$name")
2041 && prototype("CORE::$name") =~ /^;?\*/
2042 && $kid->name eq "rv2gv") {
2043 $first = $self->deparse($kid->first, 6);
2044 }
2045 else {
2046 $first = $self->deparse($kid, 6);
2047 }
e99ebc55 2048 if ($name eq "chmod" && $first =~ /^\d+$/) {
a0035eb8 2049 $first = sprintf("%#o", $first);
e99ebc55 2050 }
9d2c6865
SM
2051 $first = "+$first" if not $parens and substr($first, 0, 1) eq "(";
2052 push @exprs, $first;
2053 $kid = $kid->sibling;
2054 for (; !null($kid); $kid = $kid->sibling) {
2055 push @exprs, $self->deparse($kid, 6);
2056 }
2057 if ($parens) {
2058 return "$name(" . join(", ", @exprs) . ")";
2059 } else {
2060 return "$name " . join(", ", @exprs);
6e90668e 2061 }
6e90668e 2062}
a798dbf2 2063
6e90668e 2064sub pp_bless { listop(@_, "bless") }
3ed82cfc 2065sub pp_atan2 { maybe_targmy(@_, \&listop, "atan2") }
6e90668e
SM
2066sub pp_substr { maybe_local(@_, listop(@_, "substr")) }
2067sub pp_vec { maybe_local(@_, listop(@_, "vec")) }
3ed82cfc
GS
2068sub pp_index { maybe_targmy(@_, \&listop, "index") }
2069sub pp_rindex { maybe_targmy(@_, \&listop, "rindex") }
2070sub pp_sprintf { maybe_targmy(@_, \&listop, "sprintf") }
6e90668e 2071sub pp_formline { listop(@_, "formline") } # see also deparse_format
3ed82cfc 2072sub pp_crypt { maybe_targmy(@_, \&listop, "crypt") }
6e90668e
SM
2073sub pp_unpack { listop(@_, "unpack") }
2074sub pp_pack { listop(@_, "pack") }
3ed82cfc 2075sub pp_join { maybe_targmy(@_, \&listop, "join") }
6e90668e 2076sub pp_splice { listop(@_, "splice") }
3ed82cfc
GS
2077sub pp_push { maybe_targmy(@_, \&listop, "push") }
2078sub pp_unshift { maybe_targmy(@_, \&listop, "unshift") }
6e90668e
SM
2079sub pp_reverse { listop(@_, "reverse") }
2080sub pp_warn { listop(@_, "warn") }
2081sub pp_die { listop(@_, "die") }
9d2c6865
SM
2082# Actually, return is exempt from the LLAFR (see examples in this very
2083# module!), but for consistency's sake, ignore that fact
6e90668e
SM
2084sub pp_return { listop(@_, "return") }
2085sub pp_open { listop(@_, "open") }
2086sub pp_pipe_op { listop(@_, "pipe") }
2087sub pp_tie { listop(@_, "tie") }
82bafd27 2088sub pp_binmode { listop(@_, "binmode") }
6e90668e
SM
2089sub pp_dbmopen { listop(@_, "dbmopen") }
2090sub pp_sselect { listop(@_, "select") }
2091sub pp_select { listop(@_, "select") }
2092sub pp_read { listop(@_, "read") }
2093sub pp_sysopen { listop(@_, "sysopen") }
2094sub pp_sysseek { listop(@_, "sysseek") }
2095sub pp_sysread { listop(@_, "sysread") }
2096sub pp_syswrite { listop(@_, "syswrite") }
2097sub pp_send { listop(@_, "send") }
2098sub pp_recv { listop(@_, "recv") }
2099sub pp_seek { listop(@_, "seek") }
6e90668e
SM
2100sub pp_fcntl { listop(@_, "fcntl") }
2101sub pp_ioctl { listop(@_, "ioctl") }
3ed82cfc 2102sub pp_flock { maybe_targmy(@_, \&listop, "flock") }
6e90668e
SM
2103sub pp_socket { listop(@_, "socket") }
2104sub pp_sockpair { listop(@_, "sockpair") }
2105sub pp_bind { listop(@_, "bind") }
2106sub pp_connect { listop(@_, "connect") }
2107sub pp_listen { listop(@_, "listen") }
2108sub pp_accept { listop(@_, "accept") }
2109sub pp_shutdown { listop(@_, "shutdown") }
2110sub pp_gsockopt { listop(@_, "getsockopt") }
2111sub pp_ssockopt { listop(@_, "setsockopt") }
3ed82cfc
GS
2112sub pp_chown { maybe_targmy(@_, \&listop, "chown") }
2113sub pp_unlink { maybe_targmy(@_, \&listop, "unlink") }
2114sub pp_chmod { maybe_targmy(@_, \&listop, "chmod") }
2115sub pp_utime { maybe_targmy(@_, \&listop, "utime") }
2116sub pp_rename { maybe_targmy(@_, \&listop, "rename") }
2117sub pp_link { maybe_targmy(@_, \&listop, "link") }
2118sub pp_symlink { maybe_targmy(@_, \&listop, "symlink") }
2119sub pp_mkdir { maybe_targmy(@_, \&listop, "mkdir") }
6e90668e
SM
2120sub pp_open_dir { listop(@_, "opendir") }
2121sub pp_seekdir { listop(@_, "seekdir") }
3ed82cfc
GS
2122sub pp_waitpid { maybe_targmy(@_, \&listop, "waitpid") }
2123sub pp_system { maybe_targmy(@_, \&listop, "system") }
2124sub pp_exec { maybe_targmy(@_, \&listop, "exec") }
2125sub pp_kill { maybe_targmy(@_, \&listop, "kill") }
2126sub pp_setpgrp { maybe_targmy(@_, \&listop, "setpgrp") }
2127sub pp_getpriority { maybe_targmy(@_, \&listop, "getpriority") }
2128sub pp_setpriority { maybe_targmy(@_, \&listop, "setpriority") }
6e90668e
SM
2129sub pp_shmget { listop(@_, "shmget") }
2130sub pp_shmctl { listop(@_, "shmctl") }
2131sub pp_shmread { listop(@_, "shmread") }
2132sub pp_shmwrite { listop(@_, "shmwrite") }
2133sub pp_msgget { listop(@_, "msgget") }
2134sub pp_msgctl { listop(@_, "msgctl") }
2135sub pp_msgsnd { listop(@_, "msgsnd") }
2136sub pp_msgrcv { listop(@_, "msgrcv") }
2137sub pp_semget { listop(@_, "semget") }
2138sub pp_semctl { listop(@_, "semctl") }
2139sub pp_semop { listop(@_, "semop") }
2140sub pp_ghbyaddr { listop(@_, "gethostbyaddr") }
2141sub pp_gnbyaddr { listop(@_, "getnetbyaddr") }
2142sub pp_gpbynumber { listop(@_, "getprotobynumber") }
2143sub pp_gsbyname { listop(@_, "getservbyname") }
2144sub pp_gsbyport { listop(@_, "getservbyport") }
2145sub pp_syscall { listop(@_, "syscall") }
2146
2147sub pp_glob {
2148 my $self = shift;
9d2c6865 2149 my($op, $cx) = @_;
6e90668e
SM
2150 my $text = $self->dq($op->first->sibling); # skip pushmark
2151 if ($text =~ /^\$?(\w|::|\`)+$/ # could look like a readline
2152 or $text =~ /[<>]/) {
2153 return 'glob(' . single_delim('qq', '"', $text) . ')';
2154 } else {
2155 return '<' . $text . '>';
2156 }
2157}
2158
f5aa8f4e
SM
2159# Truncate is special because OPf_SPECIAL makes a bareword first arg
2160# be a filehandle. This could probably be better fixed in the core
2161# by moving the GV lookup into ck_truc.
2162
2163sub pp_truncate {
2164 my $self = shift;
2165 my($op, $cx) = @_;
2166 my(@exprs);
2167 my $parens = ($cx >= 5) || $self->{'parens'};
2168 my $kid = $op->first->sibling;
acba1d67 2169 my $fh;
f5aa8f4e
SM
2170 if ($op->flags & OPf_SPECIAL) {
2171 # $kid is an OP_CONST
18228111 2172 $fh = $self->const_sv($kid)->PV;
f5aa8f4e
SM
2173 } else {
2174 $fh = $self->deparse($kid, 6);
2175 $fh = "+$fh" if not $parens and substr($fh, 0, 1) eq "(";
2176 }
2177 my $len = $self->deparse($kid->sibling, 6);
2178 if ($parens) {
2179 return "truncate($fh, $len)";
2180 } else {
2181 return "truncate $fh, $len";
2182 }
f5aa8f4e
SM
2183}
2184
6e90668e
SM
2185sub indirop {
2186 my $self = shift;
9d2c6865 2187 my($op, $cx, $name) = @_;
6e90668e
SM
2188 my($expr, @exprs);
2189 my $kid = $op->first->sibling;
2190 my $indir = "";
2191 if ($op->flags & OPf_STACKED) {
2192 $indir = $kid;
2193 $indir = $indir->first; # skip rv2gv
2194 if (is_scope($indir)) {
9d2c6865 2195 $indir = "{" . $self->deparse($indir, 0) . "}";
c73811ab
RH
2196 } elsif ($indir->name eq "const" && $indir->private & OPpCONST_BARE) {
2197 $indir = $self->const_sv($indir)->PV;
6e90668e 2198 } else {
9d2c6865 2199 $indir = $self->deparse($indir, 24);
6e90668e
SM
2200 }
2201 $indir = $indir . " ";
2202 $kid = $kid->sibling;
2203 }
7e80da18
RH
2204 if ($name eq "sort" && $op->private & (OPpSORT_NUMERIC | OPpSORT_INTEGER)) {
2205 $indir = ($op->private & OPpSORT_REVERSE) ? '{$b <=> $a} '
2206 : '{$a <=> $b} ';
2207 }
2208 elsif ($name eq "sort" && $op->private & OPpSORT_REVERSE) {
2209 $indir = '{$b cmp $a} ';
2210 }
6e90668e 2211 for (; !null($kid); $kid = $kid->sibling) {
9d2c6865 2212 $expr = $self->deparse($kid, 6);
6e90668e
SM
2213 push @exprs, $expr;
2214 }
3ed82cfc 2215 return $self->maybe_parens_func($name, $indir . join(", ", @exprs),
9d2c6865 2216 $cx, 5);
6e90668e
SM
2217}
2218
2219sub pp_prtf { indirop(@_, "printf") }
2220sub pp_print { indirop(@_, "print") }
2221sub pp_sort { indirop(@_, "sort") }
2222
2223sub mapop {
2224 my $self = shift;
9d2c6865 2225 my($op, $cx, $name) = @_;
6e90668e
SM
2226 my($expr, @exprs);
2227 my $kid = $op->first; # this is the (map|grep)start
2228 $kid = $kid->first->sibling; # skip a pushmark
2229 my $code = $kid->first; # skip a null
2230 if (is_scope $code) {
f4a44678 2231 $code = "{" . $self->deparse($code, 0) . "} ";
6e90668e 2232 } else {
9d2c6865 2233 $code = $self->deparse($code, 24) . ", ";
6e90668e
SM
2234 }
2235 $kid = $kid->sibling;
2236 for (; !null($kid); $kid = $kid->sibling) {
9d2c6865 2237 $expr = $self->deparse($kid, 6);
6e90668e
SM
2238 push @exprs, $expr if $expr;
2239 }
9d2c6865 2240 return $self->maybe_parens_func($name, $code . join(", ", @exprs), $cx, 5);
6e90668e
SM
2241}
2242
2243sub pp_mapwhile { mapop(@_, "map") }
2244sub pp_grepwhile { mapop(@_, "grep") }
2245
2246sub pp_list {
2247 my $self = shift;
9d2c6865 2248 my($op, $cx) = @_;
6e90668e
SM
2249 my($expr, @exprs);
2250 my $kid = $op->first->sibling; # skip pushmark
2251 my $lop;
ce4e655d 2252 my $local = "either"; # could be local(...), my(...) or our(...)
6e90668e
SM
2253 for ($lop = $kid; !null($lop); $lop = $lop->sibling) {
2254 # This assumes that no other private flags equal 128, and that
2255 # OPs that store things other than flags in their op_private,
2256 # like OP_AELEMFAST, won't be immediate children of a list.
b8e103fc
RH
2257 #
2258 # OP_ENTERSUB can break this logic, so check for it.
2259 # I suspect that open and exit can too.
2260
2261 if (!($lop->private & (OPpLVAL_INTRO|OPpOUR_INTRO)
ce4e655d 2262 or $lop->name eq "undef")
b8e103fc
RH
2263 or $lop->name eq "entersub"
2264 or $lop->name eq "exit"
2265 or $lop->name eq "open")
6e90668e
SM
2266 {
2267 $local = ""; # or not
2268 last;
2269 }
3f872cb9 2270 if ($lop->name =~ /^pad[ash]v$/) { # my()
ce4e655d 2271 ($local = "", last) if $local eq "local" || $local eq "our";
6e90668e 2272 $local = "my";
b8e103fc
RH
2273 } elsif ($lop->name =~ /^(gv|rv2)[ash]v$/
2274 && $lop->private & OPpOUR_INTRO
2275 or $lop->name eq "null" && $lop->first->name eq "gvsv"
2276 && $lop->first->private & OPpOUR_INTRO) { # our()
ce4e655d
RH
2277 ($local = "", last) if $local eq "my" || $local eq "local";
2278 $local = "our";
3f872cb9 2279 } elsif ($lop->name ne "undef") { # local()
ce4e655d 2280 ($local = "", last) if $local eq "my" || $local eq "our";
6e90668e
SM
2281 $local = "local";
2282 }
2283 }
2284 $local = "" if $local eq "either"; # no point if it's all undefs
f5aa8f4e 2285 return $self->deparse($kid, $cx) if null $kid->sibling and not $local;
6e90668e
SM
2286 for (; !null($kid); $kid = $kid->sibling) {
2287 if ($local) {
3f872cb9 2288 if (class($kid) eq "UNOP" and $kid->first->name eq "gvsv") {
6e90668e
SM
2289 $lop = $kid->first;
2290 } else {
2291 $lop = $kid;
2292 }
2293 $self->{'avoid_local'}{$$lop}++;
9d2c6865 2294 $expr = $self->deparse($kid, 6);
6e90668e
SM
2295 delete $self->{'avoid_local'}{$$lop};
2296 } else {
9d2c6865 2297 $expr = $self->deparse($kid, 6);
6e90668e
SM
2298 }
2299 push @exprs, $expr;
2300 }
9d2c6865
SM
2301 if ($local) {
2302 return "$local(" . join(", ", @exprs) . ")";
2303 } else {
2304 return $self->maybe_parens( join(", ", @exprs), $cx, 6);
2305 }
6e90668e
SM
2306}
2307
6f611a1a
GS
2308sub is_ifelse_cont {
2309 my $op = shift;
2310 return ($op->name eq "null" and class($op) eq "UNOP"
2311 and $op->first->name =~ /^(and|cond_expr)$/
2312 and is_scope($op->first->first->sibling));
2313}
2314
6e90668e
SM
2315sub pp_cond_expr {
2316 my $self = shift;
9d2c6865 2317 my($op, $cx) = @_;
6e90668e
SM
2318 my $cond = $op->first;
2319 my $true = $cond->sibling;
2320 my $false = $true->sibling;
9d2c6865 2321 my $cuddle = $self->{'cuddle'};
6f611a1a 2322 unless ($cx == 0 and (is_scope($true) and $true->name ne "null") and
58cccf98
SM
2323 (is_scope($false) || is_ifelse_cont($false))
2324 and $self->{'expand'} < 7) {
f5aa8f4e 2325 $cond = $self->deparse($cond, 8);
9d2c6865
SM
2326 $true = $self->deparse($true, 8);
2327 $false = $self->deparse($false, 8);
2328 return $self->maybe_parens("$cond ? $true : $false", $cx, 8);
6f611a1a
GS
2329 }
2330
f5aa8f4e 2331 $cond = $self->deparse($cond, 1);
9d2c6865 2332 $true = $self->deparse($true, 0);
6f611a1a
GS
2333 my $head = "if ($cond) {\n\t$true\n\b}";
2334 my @elsifs;
2335 while (!null($false) and is_ifelse_cont($false)) {
2336 my $newop = $false->first;
2337 my $newcond = $newop->first;
2338 my $newtrue = $newcond->sibling;
2339 $false = $newtrue->sibling; # last in chain is OP_AND => no else
2340 $newcond = $self->deparse($newcond, 1);
2341 $newtrue = $self->deparse($newtrue, 0);
2342 push @elsifs, "elsif ($newcond) {\n\t$newtrue\n\b}";
2343 }
2344 if (!null($false)) {
2345 $false = $cuddle . "else {\n\t" .
2346 $self->deparse($false, 0) . "\n\b}\cK";
2347 } else {
2348 $false = "\cK";
6e90668e 2349 }
6f611a1a 2350 return $head . join($cuddle, "", @elsifs) . $false;
6e90668e
SM
2351}
2352
58cccf98 2353sub loop_common {
6e90668e 2354 my $self = shift;
58cccf98 2355 my($op, $cx, $init) = @_;
6e90668e
SM
2356 my $enter = $op->first;
2357 my $kid = $enter->sibling;
a0405c92
RH
2358 local(@$self{qw'curstash warnings hints'})
2359 = @$self{qw'curstash warnings hints'};
6e90668e 2360 my $head = "";
9d2c6865 2361 my $bare = 0;
58cccf98
SM
2362 my $body;
2363 my $cond = undef;
3f872cb9 2364 if ($kid->name eq "lineseq") { # bare or infinite loop
6e90668e 2365 if (is_state $kid->last) { # infinite
e99ebc55 2366 $head = "while (1) "; # Can't use for(;;) if there's a continue
58cccf98 2367 $cond = "";
9d2c6865
SM
2368 } else {
2369 $bare = 1;
6e90668e 2370 }
58cccf98 2371 $body = $kid;
3f872cb9 2372 } elsif ($enter->name eq "enteriter") { # foreach
6e90668e
SM
2373 my $ary = $enter->first->sibling; # first was pushmark
2374 my $var = $ary->sibling;
f5aa8f4e
SM
2375 if ($enter->flags & OPf_STACKED
2376 and not null $ary->first->sibling->sibling)
2377 {
d7f5b6da
SM
2378 $ary = $self->deparse($ary->first->sibling, 9) . " .. " .
2379 $self->deparse($ary->first->sibling->sibling, 9);
d8d95777
GA
2380 } else {
2381 $ary = $self->deparse($ary, 1);
2382 }
6e90668e 2383 if (null $var) {
f6f9bdb7 2384 if ($enter->flags & OPf_SPECIAL) { # thread special var
9d2c6865 2385 $var = $self->pp_threadsv($enter, 1);
f6f9bdb7 2386 } else { # regular my() variable
9d2c6865 2387 $var = $self->pp_padsv($enter, 1);
f6f9bdb7
SM
2388 if ($self->padname_sv($enter->targ)->IVX ==
2389 $kid->first->first->sibling->last->cop_seq)
2390 {
2391 # If the scope of this variable closes at the last
2392 # statement of the loop, it must have been
2393 # declared here.
2394 $var = "my " . $var;
2395 }
6e90668e 2396 }
3f872cb9 2397 } elsif ($var->name eq "rv2gv") {
9d2c6865 2398 $var = $self->pp_rv2sv($var, 1);
3f872cb9 2399 } elsif ($var->name eq "gv") {
9d2c6865 2400 $var = "\$" . $self->deparse($var, 1);
6e90668e 2401 }
9d2c6865 2402 $head = "foreach $var ($ary) ";
58cccf98 2403 $body = $kid->first->first->sibling; # skip OP_AND and OP_ITER
3f872cb9 2404 } elsif ($kid->name eq "null") { # while/until
6e90668e 2405 $kid = $kid->first;
58cccf98
SM
2406 my $name = {"and" => "while", "or" => "until"}->{$kid->name};
2407 $cond = $self->deparse($kid->first, 1);
2408 $head = "$name ($cond) ";
2409 $body = $kid->first->sibling;
3f872cb9 2410 } elsif ($kid->name eq "stub") { # bare and empty
9d2c6865 2411 return "{;}"; # {} could be a hashref
6e90668e 2412 }
58cccf98
SM
2413 # If there isn't a continue block, then the next pointer for the loop
2414 # will point to the unstack, which is kid's penultimate child, except
2415 # in a bare loop, when it will point to the leaveloop. When neither of
2416 # these conditions hold, then the third-to-last child in the continue
2417 # block (or the last in a bare loop).
2418 my $cont_start = $enter->nextop;
2419 my $cont;
c73811ab 2420 if ($$cont_start != $$op && ${$cont_start->sibling} != ${$body->last}) {
58cccf98
SM
2421 if ($bare) {
2422 $cont = $body->last;
2423 } else {
2424 $cont = $body->first;
2425 while (!null($cont->sibling->sibling->sibling)) {
2426 $cont = $cont->sibling;
2427 }
2428 }
2429 my $state = $body->first;
2430 my $cuddle = $self->{'cuddle'};
2431 my @states;
2432 for (; $$state != $$cont; $state = $state->sibling) {
2433 push @states, $state;
2434 }
ce4e655d 2435 $body = $self->lineseq(undef, @states);
58cccf98
SM
2436 if (defined $cond and not is_scope $cont and $self->{'expand'} < 3) {
2437 $head = "for ($init; $cond; " . $self->deparse($cont, 1) .") ";
2438 $cont = "\cK";
2439 } else {
2440 $cont = $cuddle . "continue {\n\t" .
2441 $self->deparse($cont, 0) . "\n\b}\cK";
6e90668e 2442 }
6e90668e 2443 } else {
7a9b44b9 2444 return "" if !defined $body;
c73811ab
RH
2445 if (length $init) {
2446 $head = "for ($init; $cond;) ";
2447 }
9d2c6865 2448 $cont = "\cK";
58cccf98 2449 $body = $self->deparse($body, 0);
6e90668e 2450 }
ce4e655d 2451 $body =~ s/;?$/;\n/;
34a48b4b
RH
2452
2453 return $head . "{\n\t" . $body . "\b}" . $cont;
58cccf98
SM
2454}
2455
2456sub pp_leaveloop { loop_common(@_, "") }
2457
2458sub for_loop {
2459 my $self = shift;
2460 my($op, $cx) = @_;
2461 my $init = $self->deparse($op, 1);
c73811ab 2462 return $self->loop_common($op->sibling->first->sibling, $cx, $init);
6e90668e
SM
2463}
2464
2465sub pp_leavetry {
2466 my $self = shift;
9d2c6865 2467 return "eval {\n\t" . $self->pp_leave(@_) . "\n\b}";
bd0865ec 2468}
6e90668e 2469
bd0865ec
GS
2470BEGIN { eval "sub OP_CONST () {" . opnumber("const") . "}" }
2471BEGIN { eval "sub OP_STRINGIFY () {" . opnumber("stringify") . "}" }
a9760014 2472BEGIN { eval "sub OP_RV2SV () {" . opnumber("rv2sv") . "}" }
90c0eb26 2473BEGIN { eval "sub OP_LIST () {" . opnumber("list") . "}" }
f5aa8f4e 2474
a798dbf2 2475sub pp_null {
6e90668e 2476 my $self = shift;
9d2c6865 2477 my($op, $cx) = @_;
6e90668e 2478 if (class($op) eq "OP") {
f4a44678
SM
2479 # old value is lost
2480 return $self->{'ex_const'} if $op->targ == OP_CONST;
3f872cb9 2481 } elsif ($op->first->name eq "pushmark") {
9d2c6865 2482 return $self->pp_list($op, $cx);
3f872cb9 2483 } elsif ($op->first->name eq "enter") {
9d2c6865 2484 return $self->pp_leave($op, $cx);
bd0865ec 2485 } elsif ($op->targ == OP_STRINGIFY) {
6f611a1a 2486 return $self->dquote($op, $cx);
6e90668e 2487 } elsif (!null($op->first->sibling) and
3f872cb9 2488 $op->first->sibling->name eq "readline" and
6e90668e 2489 $op->first->sibling->flags & OPf_STACKED) {
9d2c6865
SM
2490 return $self->maybe_parens($self->deparse($op->first, 7) . " = "
2491 . $self->deparse($op->first->sibling, 7),
2492 $cx, 7);
6e90668e 2493 } elsif (!null($op->first->sibling) and
3f872cb9 2494 $op->first->sibling->name eq "trans" and
6e90668e 2495 $op->first->sibling->flags & OPf_STACKED) {
9d2c6865
SM
2496 return $self->maybe_parens($self->deparse($op->first, 20) . " =~ "
2497 . $self->deparse($op->first->sibling, 20),
2498 $cx, 20);
c102638c
RH
2499 } elsif ($op->flags & OPf_SPECIAL && $cx == 0 && !$op->targ) {
2500 return "do {\n\t". $self->deparse($op->first, $cx) ."\n\b};";
ad8caead
RGS
2501 } elsif (!null($op->first->sibling) and
2502 $op->first->sibling->name eq "null" and
2503 class($op->first->sibling) eq "UNOP" and
2504 $op->first->sibling->first->flags & OPf_STACKED and
2505 $op->first->sibling->first->name eq "rcatline") {
2506 return $self->maybe_parens($self->deparse($op->first, 18) . " .= "
2507 . $self->deparse($op->first->sibling, 18),
2508 $cx, 18);
6e90668e 2509 } else {
9d2c6865 2510 return $self->deparse($op->first, $cx);
6e90668e 2511 }
a798dbf2
MB
2512}
2513
6e90668e
SM
2514sub padname {
2515 my $self = shift;
2516 my $targ = shift;
68223ea3 2517 return $self->padname_sv($targ)->PVX;
6e90668e
SM
2518}
2519
2520sub padany {
2521 my $self = shift;
2522 my $op = shift;
2523 return substr($self->padname($op->targ), 1); # skip $/@/%
2524}
2525
2526sub pp_padsv {
2527 my $self = shift;
9d2c6865
SM
2528 my($op, $cx) = @_;
2529 return $self->maybe_my($op, $cx, $self->padname($op->targ));
6e90668e
SM
2530}
2531
2532sub pp_padav { pp_padsv(@_) }
2533sub pp_padhv { pp_padsv(@_) }
2534
9d2c6865
SM
2535my @threadsv_names;
2536
2537BEGIN {
2538 @threadsv_names = ("_", "1", "2", "3", "4", "5", "6", "7", "8", "9",
2539 "&", "`", "'", "+", "/", ".", ",", "\\", '"', ";",
2540 "^", "-", "%", "=", "|", "~", ":", "^A", "^E",
2541 "!", "@");
2542}
f6f9bdb7
SM
2543
2544sub pp_threadsv {
2545 my $self = shift;
9d2c6865
SM
2546 my($op, $cx) = @_;
2547 return $self->maybe_local($op, $cx, "\$" . $threadsv_names[$op->targ]);
f6f9bdb7
SM
2548}
2549
6f611a1a 2550sub gv_or_padgv {
18228111
GS
2551 my $self = shift;
2552 my $op = shift;
6f611a1a
GS
2553 if (class($op) eq "PADOP") {
2554 return $self->padval($op->padix);
2555 } else { # class($op) eq "SVOP"
2556 return $op->gv;
18228111 2557 }
18228111
GS
2558}
2559
6e90668e
SM
2560sub pp_gvsv {
2561 my $self = shift;
9d2c6865 2562 my($op, $cx) = @_;
6f611a1a 2563 my $gv = $self->gv_or_padgv($op);
8510e997
RH
2564 return $self->maybe_local($op, $cx, $self->stash_variable("\$",
2565 $self->gv_name($gv)));
6e90668e
SM
2566}
2567
2568sub pp_gv {
2569 my $self = shift;
9d2c6865 2570 my($op, $cx) = @_;
6f611a1a 2571 my $gv = $self->gv_or_padgv($op);
18228111 2572 return $self->gv_name($gv);
6e90668e
SM
2573}
2574
2575sub pp_aelemfast {
2576 my $self = shift;
9d2c6865 2577 my($op, $cx) = @_;
6f611a1a 2578 my $gv = $self->gv_or_padgv($op);
ce4e655d
RH
2579 my $name = $self->gv_name($gv);
2580 $name = $self->{'curstash'}."::$name"
2581 if $name !~ /::/ && $self->lex_in_scope('@'.$name);
2582
2583 return "\$" . $name . "[" .
7a9b44b9 2584 ($op->private + $self->{'arybase'}) . "]";
6e90668e
SM
2585}
2586
2587sub rv2x {
2588 my $self = shift;
9d2c6865 2589 my($op, $cx, $type) = @_;
90c0eb26
RH
2590
2591 if (class($op) eq 'NULL' || !$op->can("first")) {
2592 Carp::cluck("Unexpected op in pp_rv2x");
2593 return 'XXX';
2594 }
6e90668e 2595 my $kid = $op->first;
f5aa8f4e 2596 my $str = $self->deparse($kid, 0);
8510e997
RH
2597 return $self->stash_variable($type, $str) if is_scalar($kid);
2598 return $type ."{$str}";
6e90668e
SM
2599}
2600
2601sub pp_rv2sv { maybe_local(@_, rv2x(@_, "\$")) }
2602sub pp_rv2hv { maybe_local(@_, rv2x(@_, "%")) }
2603sub pp_rv2gv { maybe_local(@_, rv2x(@_, "*")) }
2604
2605# skip rv2av
2606sub pp_av2arylen {
2607 my $self = shift;
9d2c6865 2608 my($op, $cx) = @_;
3f872cb9 2609 if ($op->first->name eq "padav") {
9d2c6865 2610 return $self->maybe_local($op, $cx, '$#' . $self->padany($op->first));
6e90668e 2611 } else {
f5aa8f4e
SM
2612 return $self->maybe_local($op, $cx,
2613 $self->rv2x($op->first, $cx, '$#'));
6e90668e
SM
2614 }
2615}
2616
2617# skip down to the old, ex-rv2cv
90c0eb26
RH
2618sub pp_rv2cv {
2619 my ($self, $op, $cx) = @_;
2620 if (!null($op->first) && $op->first->name eq 'null' &&
2621 $op->first->targ eq OP_LIST)
2622 {
2623 return $self->rv2x($op->first->first->sibling, $cx, "&")
2624 }
2625 else {
2626 return $self->rv2x($op, $cx, "")
2627 }
2628}
6e90668e
SM
2629
2630sub pp_rv2av {
2631 my $self = shift;
9d2c6865 2632 my($op, $cx) = @_;
6e90668e 2633 my $kid = $op->first;
3f872cb9 2634 if ($kid->name eq "const") { # constant list
18228111 2635 my $av = $self->const_sv($kid);
6e90668e
SM
2636 return "(" . join(", ", map(const($_), $av->ARRAY)) . ")";
2637 } else {
9d2c6865 2638 return $self->maybe_local($op, $cx, $self->rv2x($op, $cx, "\@"));
6e90668e
SM
2639 }
2640 }
2641
3ed82cfc
GS
2642sub is_subscriptable {
2643 my $op = shift;
2644 if ($op->name =~ /^[ahg]elem/) {
2645 return 1;
2646 } elsif ($op->name eq "entersub") {
2647 my $kid = $op->first;
2648 return 0 unless null $kid->sibling;
2649 $kid = $kid->first;
2650 $kid = $kid->sibling until null $kid->sibling;
2651 return 0 if is_scope($kid);
2652 $kid = $kid->first;
2653 return 0 if $kid->name eq "gv";
2654 return 0 if is_scalar($kid);
2655 return is_subscriptable($kid);
2656 } else {
2657 return 0;
2658 }
2659}
6e90668e
SM
2660
2661sub elem {
2662 my $self = shift;
9d2c6865 2663 my ($op, $cx, $left, $right, $padname) = @_;
6e90668e 2664 my($array, $idx) = ($op->first, $op->first->sibling);
3f872cb9 2665 unless ($array->name eq $padname) { # Maybe this has been fixed
6e90668e
SM
2666 $array = $array->first; # skip rv2av (or ex-rv2av in _53+)
2667 }
3f872cb9 2668 if ($array->name eq $padname) {
6e90668e
SM
2669 $array = $self->padany($array);
2670 } elsif (is_scope($array)) { # ${expr}[0]
9d2c6865 2671 $array = "{" . $self->deparse($array, 0) . "}";
ce4e655d
RH
2672 } elsif ($array->name eq "gv") {
2673 $array = $self->gv_name($self->gv_or_padgv($array));
2674 if ($array !~ /::/) {
2675 my $prefix = ($left eq '[' ? '@' : '%');
2676 $array = $self->{curstash}.'::'.$array
2677 if $self->lex_in_scope($prefix . $array);
2678 }
6e90668e 2679 } elsif (is_scalar $array) { # $x[0], $$x[0], ...
9d2c6865 2680 $array = $self->deparse($array, 24);
6e90668e
SM
2681 } else {
2682 # $x[20][3]{hi} or expr->[20]
3ed82cfc 2683 my $arrow = is_subscriptable($array) ? "" : "->";
9d2c6865
SM
2684 return $self->deparse($array, 24) . $arrow .
2685 $left . $self->deparse($idx, 1) . $right;
6e90668e 2686 }
9d2c6865 2687 $idx = $self->deparse($idx, 1);
7a9b44b9
RH
2688
2689 # Outer parens in an array index will confuse perl
2690 # if we're interpolating in a regular expression, i.e.
2691 # /$x$foo[(-1)]/ is *not* the same as /$x$foo[-1]/
2692 #
2693 # If $self->{parens}, then an initial '(' will
2694 # definitely be paired with a final ')'. If
2695 # !$self->{parens}, the misleading parens won't
2696 # have been added in the first place.
2697 #
2698 # [You might think that we could get "(...)...(...)"
2699 # where the initial and final parens do not match
2700 # each other. But we can't, because the above would
2701 # only happen if there's an infix binop between the
2702 # two pairs of parens, and *that* means that the whole
2703 # expression would be parenthesized as well.]
2704 #
2705 $idx =~ s/^\((.*)\)$/$1/ if $self->{'parens'};
2706
098251bc
RH
2707 # Hash-element braces will autoquote a bareword inside themselves.
2708 # We need to make sure that C<$hash{warn()}> doesn't come out as
2709 # C<$hash{warn}>, which has a quite different meaning. Currently
2710 # B::Deparse will always quote strings, even if the string was a
2711 # bareword in the original (i.e. the OPpCONST_BARE flag is ignored
2712 # for constant strings.) So we can cheat slightly here - if we see
2713 # a bareword, we know that it is supposed to be a function call.
2714 #
2715 $idx =~ s/^([A-Za-z_]\w*)$/$1()/;
2716
6e90668e
SM
2717 return "\$" . $array . $left . $idx . $right;
2718}
2719
3f872cb9
GS
2720sub pp_aelem { maybe_local(@_, elem(@_, "[", "]", "padav")) }
2721sub pp_helem { maybe_local(@_, elem(@_, "{", "}", "padhv")) }
6e90668e
SM
2722
2723sub pp_gelem {
2724 my $self = shift;
9d2c6865 2725 my($op, $cx) = @_;
6e90668e
SM
2726 my($glob, $part) = ($op->first, $op->last);
2727 $glob = $glob->first; # skip rv2gv
3f872cb9 2728 $glob = $glob->first if $glob->name eq "rv2gv"; # this one's a bug
9d2c6865
SM
2729 my $scope = is_scope($glob);
2730 $glob = $self->deparse($glob, 0);
2731 $part = $self->deparse($part, 1);
6e90668e
SM
2732 return "*" . ($scope ? "{$glob}" : $glob) . "{$part}";
2733}
2734
2735sub slice {
2736 my $self = shift;
9d2c6865 2737 my ($op, $cx, $left, $right, $regname, $padname) = @_;
6e90668e
SM
2738 my $last;
2739 my(@elems, $kid, $array, $list);
2740 if (class($op) eq "LISTOP") {
2741 $last = $op->last;
2742 } else { # ex-hslice inside delete()
2743 for ($kid = $op->first; !null $kid->sibling; $kid = $kid->sibling) {}
2744 $last = $kid;
2745 }
2746 $array = $last;
2747 $array = $array->first
3f872cb9 2748 if $array->name eq $regname or $array->name eq "null";
6e90668e 2749 if (is_scope($array)) {
9d2c6865 2750 $array = "{" . $self->deparse($array, 0) . "}";
3f872cb9 2751 } elsif ($array->name eq $padname) {
6e90668e
SM
2752 $array = $self->padany($array);
2753 } else {
9d2c6865 2754 $array = $self->deparse($array, 24);
6e90668e
SM
2755 }
2756 $kid = $op->first->sibling; # skip pushmark
3f872cb9 2757 if ($kid->name eq "list") {
6e90668e
SM
2758 $kid = $kid->first->sibling; # skip list, pushmark
2759 for (; !null $kid; $kid = $kid->sibling) {
9d2c6865 2760 push @elems, $self->deparse($kid, 6);
6e90668e
SM
2761 }
2762 $list = join(", ", @elems);
2763 } else {
9d2c6865 2764 $list = $self->deparse($kid, 1);
6e90668e
SM
2765 }
2766 return "\@" . $array . $left . $list . $right;
2767}
2768
3ed82cfc
GS
2769sub pp_aslice { maybe_local(@_, slice(@_, "[", "]", "rv2av", "padav")) }
2770sub pp_hslice { maybe_local(@_, slice(@_, "{", "}", "rv2hv", "padhv")) }
6e90668e
SM
2771
2772sub pp_lslice {
2773 my $self = shift;
9d2c6865 2774 my($op, $cx) = @_;
6e90668e
SM
2775 my $idx = $op->first;
2776 my $list = $op->last;
2777 my(@elems, $kid);
9d2c6865
SM
2778 $list = $self->deparse($list, 1);
2779 $idx = $self->deparse($idx, 1);
2780 return "($list)" . "[$idx]";
6e90668e
SM
2781}
2782
6e90668e
SM
2783sub want_scalar {
2784 my $op = shift;
2785 return ($op->flags & OPf_WANT) == OPf_WANT_SCALAR;
2786}
2787
bd0865ec
GS
2788sub want_list {
2789 my $op = shift;
2790 return ($op->flags & OPf_WANT) == OPf_WANT_LIST;
2791}
2792
2793sub method {
6e90668e 2794 my $self = shift;
9d2c6865 2795 my($op, $cx) = @_;
bd0865ec
GS
2796 my $kid = $op->first->sibling; # skip pushmark
2797 my($meth, $obj, @exprs);
3f872cb9 2798 if ($kid->name eq "list" and want_list $kid) {
bd0865ec
GS
2799 # When an indirect object isn't a bareword but the args are in
2800 # parens, the parens aren't part of the method syntax (the LLAFR
2801 # doesn't apply), but they make a list with OPf_PARENS set that
2802 # doesn't get flattened by the append_elem that adds the method,
2803 # making a (object, arg1, arg2, ...) list where the object
2804 # usually is. This can be distinguished from
2805 # `($obj, $arg1, $arg2)->meth()' (which is legal if $arg2 is an
2806 # object) because in the later the list is in scalar context
2807 # as the left side of -> always is, while in the former
2808 # the list is in list context as method arguments always are.
2809 # (Good thing there aren't method prototypes!)
3ed82cfc 2810 $meth = $kid->sibling;
bd0865ec
GS
2811 $kid = $kid->first->sibling; # skip pushmark
2812 $obj = $kid;
6e90668e 2813 $kid = $kid->sibling;
bd0865ec 2814 for (; not null $kid; $kid = $kid->sibling) {
9d2c6865 2815 push @exprs, $self->deparse($kid, 6);
6e90668e 2816 }
bd0865ec
GS
2817 } else {
2818 $obj = $kid;
2819 $kid = $kid->sibling;
90c0eb26
RH
2820 for (; !null ($kid->sibling) && $kid->name ne "method_named";
2821 $kid = $kid->sibling) {
bd0865ec 2822 push @exprs, $self->deparse($kid, 6);
6e90668e 2823 }
3ed82cfc 2824 $meth = $kid;
bd0865ec
GS
2825 }
2826 $obj = $self->deparse($obj, 24);
3ed82cfc 2827 if ($meth->name eq "method_named") {
18228111 2828 $meth = $self->const_sv($meth)->PV;
bd0865ec 2829 } else {
3ed82cfc
GS
2830 $meth = $meth->first;
2831 if ($meth->name eq "const") {
2832 # As of 5.005_58, this case is probably obsoleted by the
2833 # method_named case above
18228111 2834 $meth = $self->const_sv($meth)->PV; # needs to be bare
3ed82cfc
GS
2835 } else {
2836 $meth = $self->deparse($meth, 1);
2837 }
bd0865ec
GS
2838 }
2839 my $args = join(", ", @exprs);
2840 $kid = $obj . "->" . $meth;
145eb477 2841 if (length $args) {
bd0865ec
GS
2842 return $kid . "(" . $args . ")"; # parens mandatory
2843 } else {
2844 return $kid;
2845 }
2846}
2847
2848# returns "&" if the prototype doesn't match the args,
2849# or ("", $args_after_prototype_demunging) if it does.
2850sub check_proto {
2851 my $self = shift;
2852 my($proto, @args) = @_;
2853 my($arg, $real);
2854 my $doneok = 0;
2855 my @reals;
2856 # An unbackslashed @ or % gobbles up the rest of the args
2857 $proto =~ s/([^\\]|^)([@%])(.*)$/$1$2/;
2858 while ($proto) {
2859 $proto =~ s/^ *([\\]?[\$\@&%*]|;)//;
2860 my $chr = $1;
2861 if ($chr eq "") {
2862 return "&" if @args;
2863 } elsif ($chr eq ";") {
2864 $doneok = 1;
2865 } elsif ($chr eq "@" or $chr eq "%") {
2866 push @reals, map($self->deparse($_, 6), @args);
2867 @args = ();
6e90668e 2868 } else {
bd0865ec
GS
2869 $arg = shift @args;
2870 last unless $arg;
2871 if ($chr eq "\$") {
2872 if (want_scalar $arg) {
2873 push @reals, $self->deparse($arg, 6);
2874 } else {
2875 return "&";
2876 }
2877 } elsif ($chr eq "&") {
3f872cb9 2878 if ($arg->name =~ /^(s?refgen|undef)$/) {
bd0865ec
GS
2879 push @reals, $self->deparse($arg, 6);
2880 } else {
2881 return "&";
2882 }
2883 } elsif ($chr eq "*") {
3f872cb9
GS
2884 if ($arg->name =~ /^s?refgen$/
2885 and $arg->first->first->name eq "rv2gv")
bd0865ec
GS
2886 {
2887 $real = $arg->first->first; # skip refgen, null
3f872cb9 2888 if ($real->first->name eq "gv") {
bd0865ec
GS
2889 push @reals, $self->deparse($real, 6);
2890 } else {
2891 push @reals, $self->deparse($real->first, 6);
2892 }
2893 } else {
2894 return "&";
2895 }
2896 } elsif (substr($chr, 0, 1) eq "\\") {
2897 $chr = substr($chr, 1);
3f872cb9 2898 if ($arg->name =~ /^s?refgen$/ and
bd0865ec
GS
2899 !null($real = $arg->first) and
2900 ($chr eq "\$" && is_scalar($real->first)
2901 or ($chr eq "\@"
3f872cb9
GS
2902 && $real->first->sibling->name
2903 =~ /^(rv2|pad)av$/)
bd0865ec 2904 or ($chr eq "%"
3f872cb9
GS
2905 && $real->first->sibling->name
2906 =~ /^(rv2|pad)hv$/)
bd0865ec 2907 #or ($chr eq "&" # This doesn't work
3f872cb9 2908 # && $real->first->name eq "rv2cv")
bd0865ec 2909 or ($chr eq "*"
3f872cb9 2910 && $real->first->name eq "rv2gv")))
bd0865ec
GS
2911 {
2912 push @reals, $self->deparse($real, 6);
2913 } else {
2914 return "&";
2915 }
2916 }
2917 }
9d2c6865 2918 }
bd0865ec
GS
2919 return "&" if $proto and !$doneok; # too few args and no `;'
2920 return "&" if @args; # too many args
2921 return ("", join ", ", @reals);
2922}
2923
2924sub pp_entersub {
2925 my $self = shift;
2926 my($op, $cx) = @_;
2927 return $self->method($op, $cx) unless null $op->first->sibling;
2928 my $prefix = "";
2929 my $amper = "";
2930 my($kid, @exprs);
90c0eb26 2931 if ($op->flags & OPf_SPECIAL && !($op->flags & OPf_MOD)) {
9d2c6865
SM
2932 $prefix = "do ";
2933 } elsif ($op->private & OPpENTERSUB_AMPER) {
2934 $amper = "&";
2935 }
2936 $kid = $op->first;
2937 $kid = $kid->first->sibling; # skip ex-list, pushmark
2938 for (; not null $kid->sibling; $kid = $kid->sibling) {
2939 push @exprs, $kid;
2940 }
bd0865ec
GS
2941 my $simple = 0;
2942 my $proto = undef;
9d2c6865
SM
2943 if (is_scope($kid)) {
2944 $amper = "&";
2945 $kid = "{" . $self->deparse($kid, 0) . "}";
3f872cb9 2946 } elsif ($kid->first->name eq "gv") {
6f611a1a 2947 my $gv = $self->gv_or_padgv($kid->first);
9d2c6865
SM
2948 if (class($gv->CV) ne "SPECIAL") {
2949 $proto = $gv->CV->PV if $gv->CV->FLAGS & SVf_POK;
2950 }
bd0865ec 2951 $simple = 1; # only calls of named functions can be prototyped
9d2c6865 2952 $kid = $self->deparse($kid, 24);
90c0eb26 2953 } elsif (is_scalar ($kid->first) && $kid->first->name ne 'rv2cv') {
9d2c6865
SM
2954 $amper = "&";
2955 $kid = $self->deparse($kid, 24);
2956 } else {
2957 $prefix = "";
3ed82cfc
GS
2958 my $arrow = is_subscriptable($kid->first) ? "" : "->";
2959 $kid = $self->deparse($kid, 24) . $arrow;
9d2c6865 2960 }
0ca62a8e
RH
2961
2962 # Doesn't matter how many prototypes there are, if
2963 # they haven't happened yet!
2964 my $declared = exists $self->{'subs_declared'}{$kid};
e99ebc55
RH
2965 if (!$declared && defined($proto)) {
2966 # Avoid "too early to check prototype" warning
2967 ($amper, $proto) = ('&');
2968 }
0ca62a8e 2969
bd0865ec 2970 my $args;
0ca62a8e 2971 if ($declared and defined $proto and not $amper) {
bd0865ec
GS
2972 ($amper, $args) = $self->check_proto($proto, @exprs);
2973 if ($amper eq "&") {
9d2c6865
SM
2974 $args = join(", ", map($self->deparse($_, 6), @exprs));
2975 }
2976 } else {
2977 $args = join(", ", map($self->deparse($_, 6), @exprs));
6e90668e 2978 }
9d2c6865
SM
2979 if ($prefix or $amper) {
2980 if ($op->flags & OPf_STACKED) {
2981 return $prefix . $amper . $kid . "(" . $args . ")";
2982 } else {
2983 return $prefix . $amper. $kid;
2984 }
6e90668e 2985 } else {
34a48b4b 2986 # glob() invocations can be translated into calls of
d1be9408 2987 # CORE::GLOBAL::glob with a second parameter, a number.
34a48b4b
RH
2988 # Reverse this.
2989 if ($kid eq "CORE::GLOBAL::glob") {
2990 $kid = "glob";
2991 $args =~ s/\s*,[^,]+$//;
2992 }
2993
2994 # It's a syntax error to call CORE::GLOBAL::foo without a prefix,
2995 # so it must have been translated from a keyword call. Translate
2996 # it back.
2997 $kid =~ s/^CORE::GLOBAL:://;
2998
0ca62a8e
RH
2999 if (!$declared) {
3000 return "$kid(" . $args . ")";
3001 } elsif (defined $proto and $proto eq "") {
9d2c6865 3002 return $kid;
ce4e655d 3003 } elsif (defined $proto and $proto eq "\$" and is_scalar($exprs[0])) {
9d2c6865 3004 return $self->maybe_parens_func($kid, $args, $cx, 16);
6f611a1a 3005 } elsif (defined($proto) && $proto or $simple) {
9d2c6865
SM
3006 return $self->maybe_parens_func($kid, $args, $cx, 5);
3007 } else {
3008 return "$kid(" . $args . ")";
3009 }
6e90668e
SM
3010 }
3011}
3012
3013sub pp_enterwrite { unop(@_, "write") }
3014
3015# escape things that cause interpolation in double quotes,
3016# but not character escapes
3017sub uninterp {
3018 my($str) = @_;
3f766ba3 3019 $str =~ s/(^|\G|[^\\])((?:\\\\)*)([\$\@]|\\[uUlLQE])/$1$2\\$3/g;
9d2c6865
SM
3020 return $str;
3021}
3022
b7dad2dc
RH
3023{
3024my $bal;
3025BEGIN {
cdf8218f
RH
3026 use re "eval";
3027 # Matches any string which is balanced with respect to {braces}
b7dad2dc 3028 $bal = qr(
cdf8218f
RH
3029 (?:
3030 [^\\{}]
3031 | \\\\
3032 | \\[{}]
3033 | \{(??{$bal})\}
3034 )*
3035 )x;
b7dad2dc
RH
3036}
3037
3038# the same, but treat $|, $), $( and $ at the end of the string differently
3039sub re_uninterp {
3040 my($str) = @_;
cdf8218f
RH
3041
3042 $str =~ s/
3043 ( ^|\G # $1
3044 | [^\\]
3045 )
3046
3047 ( # $2
3048 (?:\\\\)*
3049 )
3050
3051 ( # $3
3052 (\(\?\??\{$bal\}\)) # $4
3053 | [\$\@]
3054 (?!\||\)|\(|$)
3055 | \\[uUlLQE]
3056 )
3057
3058 /length($4) ? "$1$2$4" : "$1$2\\$3"/xeg;
3059
6e90668e
SM
3060 return $str;
3061}
3062
b7dad2dc
RH
3063# This is for regular expressions with the /x modifier
3064# We have to leave comments unmangled.
a9760014 3065sub re_uninterp_extended {
b7dad2dc
RH
3066 my($str) = @_;
3067
3068 $str =~ s/
3069 ( ^|\G # $1
3070 | [^\\]
3071 )
3072
3073 ( # $2
3074 (?:\\\\)*
3075 )
3076
3077 ( # $3
3078 ( \(\?\??\{$bal\}\) # $4 (skip over (?{}) and (??{}) blocks)
3079 | \#[^\n]* # (skip over comments)
3080 )
3081 | [\$\@]
3082 (?!\||\)|\(|$)
3083 | \\[uUlLQE]
3084 )
3085
3086 /length($4) ? "$1$2$4" : "$1$2\\$3"/xeg;
3087
a9760014
RH
3088 return $str;
3089}
b7dad2dc 3090}
a9760014 3091
6e90668e 3092# character escapes, but not delimiters that might need to be escaped
746698c5 3093sub escape_str { # ASCII, UTF8
6e90668e 3094 my($str) = @_;
746698c5 3095 $str =~ s/(.)/ord($1)>255 ? sprintf("\\x{%x}", ord($1)) : $1/eg;
6e90668e
SM
3096 $str =~ s/\a/\\a/g;
3097# $str =~ s/\cH/\\b/g; # \b means someting different in a regex
3098 $str =~ s/\t/\\t/g;
3099 $str =~ s/\n/\\n/g;
3100 $str =~ s/\e/\\e/g;
3101 $str =~ s/\f/\\f/g;
3102 $str =~ s/\r/\\r/g;
3103 $str =~ s/([\cA-\cZ])/'\\c' . chr(ord('@') + ord($1))/ge;
3104 $str =~ s/([\0\033-\037\177-\377])/'\\' . sprintf("%03o", ord($1))/ge;
3105 return $str;
3106}
3107
b7dad2dc
RH
3108# For regexes with the /x modifier.
3109# Leave whitespace unmangled.
a9760014
RH
3110sub escape_extended_re {
3111 my($str) = @_;
3112 $str =~ s/(.)/ord($1)>255 ? sprintf("\\x{%x}", ord($1)) : $1/eg;
3113 $str =~ s/([\0\033-\037\177-\377])/'\\' . sprintf("%03o", ord($1))/ge;
3114 $str =~ s/\n/\n\f/g;
3115 return $str;
3116}
3117
9d2c6865
SM
3118# Don't do this for regexen
3119sub unback {
3120 my($str) = @_;
3121 $str =~ s/\\/\\\\/g;
3122 return $str;
3123}
3124
08c6f5ec
RH
3125# Remove backslashes which precede literal control characters,
3126# to avoid creating ambiguity when we escape the latter.
3127sub re_unback {
3128 my($str) = @_;
3129
3130 # the insane complexity here is due to the behaviour of "\c\"
3131 $str =~ s/(^|[^\\]|\\c\\)(?<!\\c)\\(\\\\)*(?=[\0-\031\177-\377])/$1$2/g;
3132 return $str;
3133}
3134
6e90668e
SM
3135sub balanced_delim {
3136 my($str) = @_;
3137 my @str = split //, $str;
3138 my($ar, $open, $close, $fail, $c, $cnt);
3139 for $ar (['[',']'], ['(',')'], ['<','>'], ['{','}']) {
3140 ($open, $close) = @$ar;
3141 $fail = 0; $cnt = 0;
3142 for $c (@str) {
3143 if ($c eq $open) {
3144 $cnt++;
3145 } elsif ($c eq $close) {
3146 $cnt--;
3147 if ($cnt < 0) {
bd0865ec 3148 # qq()() isn't ")("
6e90668e
SM
3149 $fail = 1;
3150 last;
3151 }
3152 }
3153 }
3154 $fail = 1 if $cnt != 0;
3155 return ($open, "$open$str$close") if not $fail;
3156 }
3157 return ("", $str);
3158}
3159
3160sub single_delim {
3161 my($q, $default, $str) = @_;
90be192f 3162 return "$default$str$default" if $default and index($str, $default) == -1;
8347ad86
RGS
3163 if ($q ne 'qr') {
3164 (my $succeed, $str) = balanced_delim($str);
3165 return "$q$str" if $succeed;
3166 }
3167 for my $delim ('/', '"', '#') {
6e90668e
SM
3168 return "$q$delim" . $str . $delim if index($str, $delim) == -1;
3169 }
90be192f
SM
3170 if ($default) {
3171 $str =~ s/$default/\\$default/g;
3172 return "$default$str$default";
3173 } else {
3174 $str =~ s[/][\\/]g;
3175 return "$q/$str/";
3176 }
6e90668e
SM
3177}
3178
6e90668e
SM
3179sub const {
3180 my $sv = shift;
3181 if (class($sv) eq "SPECIAL") {
bd0865ec 3182 return ('undef', '1', '0')[$$sv-1]; # sv_undef, sv_yes, sv_no
7a9b44b9
RH
3183 } elsif (class($sv) eq "NULL") {
3184 return 'undef';
6e90668e 3185 } elsif ($sv->FLAGS & SVf_IOK) {
d9963e60 3186 return $sv->int_value;
6e90668e 3187 } elsif ($sv->FLAGS & SVf_NOK) {
fecea806
RH
3188 # try the default stringification
3189 my $r = "".$sv->NV;
3190 if ($r =~ /e/) {
3191 # If it's in scientific notation, we might have lost information
3192 return sprintf("%.20e", $sv->NV);
3193 }
3194 return $r;
7a9b44b9 3195 } elsif ($sv->FLAGS & SVf_ROK && $sv->can("RV")) {
6e90668e 3196 return "\\(" . const($sv->RV) . ")"; # constant folded
34768ba5 3197 } elsif ($sv->FLAGS & SVf_POK) {
6e90668e 3198 my $str = $sv->PV;
bd0865ec 3199 if ($str =~ /[^ -~]/) { # ASCII for non-printing
9d2c6865 3200 return single_delim("qq", '"', uninterp escape_str unback $str);
6e90668e 3201 } else {
bd0865ec 3202 return single_delim("q", "'", unback $str);
6e90668e 3203 }
34768ba5
RH
3204 } else {
3205 return "undef";
a798dbf2
MB
3206 }
3207}
3208
18228111
GS
3209sub const_sv {
3210 my $self = shift;
3211 my $op = shift;
3212 my $sv = $op->sv;
3213 # the constant could be in the pad (under useithreads)
3214 $sv = $self->padval($op->targ) unless $$sv;
3215 return $sv;
3216}
3217
6e90668e
SM
3218sub pp_const {
3219 my $self = shift;
9d2c6865 3220 my($op, $cx) = @_;
7e40138b
RH
3221 if ($op->private & OPpCONST_ARYBASE) {
3222 return '$[';
3223 }
4c1f658f 3224# if ($op->private & OPpCONST_BARE) { # trouble with `=>' autoquoting
18228111 3225# return $self->const_sv($op)->PV;
6e90668e 3226# }
18228111 3227 my $sv = $self->const_sv($op);
d5ae42cc
JM
3228# return const($sv);
3229 my $c = const $sv;
76ef7183 3230 return $c =~ /^-\d/ ? $self->maybe_parens($c, $cx, 21) : $c;
6e90668e
SM
3231}
3232
3233sub dq {
3234 my $self = shift;
3235 my $op = shift;
3f872cb9
GS
3236 my $type = $op->name;
3237 if ($type eq "const") {
f3402b25
RH
3238 return '$[' if $op->private & OPpCONST_ARYBASE;
3239 return uninterp(escape_str(unback($self->const_sv($op)->as_string)));
3f872cb9 3240 } elsif ($type eq "concat") {
8fed1104
RH
3241 my $first = $self->dq($op->first);
3242 my $last = $self->dq($op->last);
44c6d2a1 3243
b7dad2dc 3244 # Disambiguate "${foo}bar", "${foo}{bar}", "${foo}[1]"
44c6d2a1
RH
3245 ($last =~ /^[A-Z\\\^\[\]_?]/ &&
3246 $first =~ s/([\$@])\^$/${1}{^}/) # "${^}W" etc
3247 || ($last =~ /^[{\[\w_]/ &&
3248 $first =~ s/([\$@])([A-Za-z_]\w*)$/${1}{$2}/);
3249
8fed1104 3250 return $first . $last;
3f872cb9 3251 } elsif ($type eq "uc") {
6e90668e 3252 return '\U' . $self->dq($op->first->sibling) . '\E';
3f872cb9 3253 } elsif ($type eq "lc") {
6e90668e 3254 return '\L' . $self->dq($op->first->sibling) . '\E';
3f872cb9 3255 } elsif ($type eq "ucfirst") {
6e90668e 3256 return '\u' . $self->dq($op->first->sibling);
3f872cb9 3257 } elsif ($type eq "lcfirst") {
6e90668e 3258 return '\l' . $self->dq($op->first->sibling);
3f872cb9 3259 } elsif ($type eq "quotemeta") {
6e90668e 3260 return '\Q' . $self->dq($op->first->sibling) . '\E';
3f872cb9 3261 } elsif ($type eq "join") {
9d2c6865 3262 return $self->deparse($op->last, 26); # was join($", @ary)
a798dbf2 3263 } else {
9d2c6865 3264 return $self->deparse($op, 26);
6e90668e
SM
3265 }
3266}
3267
3268sub pp_backtick {
3269 my $self = shift;
9d2c6865 3270 my($op, $cx) = @_;
6e90668e
SM
3271 # skip pushmark
3272 return single_delim("qx", '`', $self->dq($op->first->sibling));
3273}
3274
3275sub dquote {
3276 my $self = shift;
6f611a1a 3277 my($op, $cx) = @_;
3ed82cfc
GS
3278 my $kid = $op->first->sibling; # skip ex-stringify, pushmark
3279 return $self->deparse($kid, $cx) if $self->{'unquote'};
3280 $self->maybe_targmy($kid, $cx,
3281 sub {single_delim("qq", '"', $self->dq($_[1]))});
6e90668e
SM
3282}
3283
bd0865ec 3284# OP_STRINGIFY is a listop, but it only ever has one arg
3ed82cfc 3285sub pp_stringify { maybe_targmy(@_, \&dquote) }
6e90668e
SM
3286
3287# tr/// and s/// (and tr[][], tr[]//, tr###, etc)
3288# note that tr(from)/to/ is OK, but not tr/from/(to)
3289sub double_delim {
3290 my($from, $to) = @_;
3291 my($succeed, $delim);
3292 if ($from !~ m[/] and $to !~ m[/]) {
3293 return "/$from/$to/";
3294 } elsif (($succeed, $from) = balanced_delim($from) and $succeed) {
3295 if (($succeed, $to) = balanced_delim($to) and $succeed) {
3296 return "$from$to";
3297 } else {
3298 for $delim ('/', '"', '#') { # note no `'' -- s''' is special
3299 return "$from$delim$to$delim" if index($to, $delim) == -1;
3300 }
3301 $to =~ s[/][\\/]g;
3302 return "$from/$to/";
3303 }
3304 } else {
3305 for $delim ('/', '"', '#') { # note no '
3306 return "$delim$from$delim$to$delim"
3307 if index($to . $from, $delim) == -1;
3308 }
3309 $from =~ s[/][\\/]g;
3310 $to =~ s[/][\\/]g;
3311 return "/$from/$to/";
3312 }
3313}
3314
2a9e2f8a 3315# Only used by tr///, so backslashes hyphens
6e90668e
SM
3316sub pchr { # ASCII
3317 my($n) = @_;
3318 if ($n == ord '\\') {
3319 return '\\\\';
2a9e2f8a
RH
3320 } elsif ($n == ord "-") {
3321 return "\\-";
6e90668e
SM
3322 } elsif ($n >= ord(' ') and $n <= ord('~')) {
3323 return chr($n);
3324 } elsif ($n == ord "\a") {
3325 return '\\a';
3326 } elsif ($n == ord "\b") {
3327 return '\\b';
3328 } elsif ($n == ord "\t") {
3329 return '\\t';
3330 } elsif ($n == ord "\n") {
3331 return '\\n';
3332 } elsif ($n == ord "\e") {
3333 return '\\e';
3334 } elsif ($n == ord "\f") {
3335 return '\\f';
3336 } elsif ($n == ord "\r") {
3337 return '\\r';
3338 } elsif ($n >= ord("\cA") and $n <= ord("\cZ")) {
3339 return '\\c' . chr(ord("@") + $n);
3340 } else {
3341# return '\x' . sprintf("%02x", $n);
3342 return '\\' . sprintf("%03o", $n);
3343 }
3344}
3345
3346sub collapse {
3347 my(@chars) = @_;
23db111c 3348 my($str, $c, $tr) = ("");
6e90668e
SM
3349 for ($c = 0; $c < @chars; $c++) {
3350 $tr = $chars[$c];
3351 $str .= pchr($tr);
3352 if ($c <= $#chars - 2 and $chars[$c + 1] == $tr + 1 and
3353 $chars[$c + 2] == $tr + 2)
3354 {
f4a44678
SM
3355 for (; $c <= $#chars-1 and $chars[$c + 1] == $chars[$c] + 1; $c++)
3356 {}
6e90668e
SM
3357 $str .= "-";
3358 $str .= pchr($chars[$c]);
3359 }
3360 }
3361 return $str;
3362}
3363
f4a44678
SM
3364sub tr_decode_byte {
3365 my($table, $flags) = @_;
2a9e2f8a 3366 my(@table) = unpack("s*", $table);
bec89253 3367 splice @table, 0x100, 1; # Number of subsequent elements
6e90668e
SM
3368 my($c, $tr, @from, @to, @delfrom, $delhyphen);
3369 if ($table[ord "-"] != -1 and
3370 $table[ord("-") - 1] == -1 || $table[ord("-") + 1] == -1)
3371 {
3372 $tr = $table[ord "-"];
3373 $table[ord "-"] = -1;
3374 if ($tr >= 0) {
3375 @from = ord("-");
3376 @to = $tr;
3377 } else { # -2 ==> delete
3378 $delhyphen = 1;
3379 }
3380 }
2a9e2f8a 3381 for ($c = 0; $c < @table; $c++) {
6e90668e
SM
3382 $tr = $table[$c];
3383 if ($tr >= 0) {
3384 push @from, $c; push @to, $tr;
3385 } elsif ($tr == -2) {
3386 push @delfrom, $c;
3387 }
3388 }
6e90668e 3389 @from = (@from, @delfrom);
f4a44678 3390 if ($flags & OPpTRANS_COMPLEMENT) {
6e90668e
SM
3391 my @newfrom = ();
3392 my %from;
3393 @from{@from} = (1) x @from;
3394 for ($c = 0; $c < 256; $c++) {
3395 push @newfrom, $c unless $from{$c};
3396 }
3397 @from = @newfrom;
3398 }
56d8b52c 3399 unless ($flags & OPpTRANS_DELETE || !@to) {
6e90668e
SM
3400 pop @to while $#to and $to[$#to] == $to[$#to -1];
3401 }
6e90668e
SM
3402 my($from, $to);
3403 $from = collapse(@from);
3404 $to = collapse(@to);
3405 $from .= "-" if $delhyphen;
f4a44678
SM
3406 return ($from, $to);
3407}
3408
3409sub tr_chr {
3410 my $x = shift;
3411 if ($x == ord "-") {
3412 return "\\-";
2a9e2f8a
RH
3413 } elsif ($x == ord "\\") {
3414 return "\\\\";
f4a44678
SM
3415 } else {
3416 return chr $x;
3417 }
3418}
3419
3420# XXX This doesn't yet handle all cases correctly either
3421
3422sub tr_decode_utf8 {
3423 my($swash_hv, $flags) = @_;
3424 my %swash = $swash_hv->ARRAY;
3425 my $final = undef;
3426 $final = $swash{'FINAL'}->IV if exists $swash{'FINAL'};
3427 my $none = $swash{"NONE"}->IV;
3428 my $extra = $none + 1;
3429 my(@from, @delfrom, @to);
3430 my $line;
3431 foreach $line (split /\n/, $swash{'LIST'}->PV) {
3432 my($min, $max, $result) = split(/\t/, $line);
3433 $min = hex $min;
3434 if (length $max) {
3435 $max = hex $max;
3436 } else {
3437 $max = $min;
3438 }
3439 $result = hex $result;
3440 if ($result == $extra) {
3441 push @delfrom, [$min, $max];
3442 } else {
3443 push @from, [$min, $max];
3444 push @to, [$result, $result + $max - $min];
3445 }
3446 }
3447 for my $i (0 .. $#from) {
3448 if ($from[$i][0] == ord '-') {
3449 unshift @from, splice(@from, $i, 1);
3450 unshift @to, splice(@to, $i, 1);
3451 last;
3452 } elsif ($from[$i][1] == ord '-') {
3453 $from[$i][1]--;
3454 $to[$i][1]--;
3455 unshift @from, ord '-';
3456 unshift @to, ord '-';
3457 last;
3458 }
3459 }
3460 for my $i (0 .. $#delfrom) {
3461 if ($delfrom[$i][0] == ord '-') {
3462 push @delfrom, splice(@delfrom, $i, 1);
3463 last;
3464 } elsif ($delfrom[$i][1] == ord '-') {
3465 $delfrom[$i][1]--;
3466 push @delfrom, ord '-';
3467 last;
3468 }
3469 }
3470 if (defined $final and $to[$#to][1] != $final) {
3471 push @to, [$final, $final];
3472 }
3473 push @from, @delfrom;
3474 if ($flags & OPpTRANS_COMPLEMENT) {
3475 my @newfrom;
3476 my $next = 0;
3477 for my $i (0 .. $#from) {
3478 push @newfrom, [$next, $from[$i][0] - 1];
3479 $next = $from[$i][1] + 1;
3480 }
3481 @from = ();
3482 for my $range (@newfrom) {
3483 if ($range->[0] <= $range->[1]) {
3484 push @from, $range;
3485 }
3486 }
3487 }
3488 my($from, $to, $diff);
3489 for my $chunk (@from) {
3490 $diff = $chunk->[1] - $chunk->[0];
3491 if ($diff > 1) {
3492 $from .= tr_chr($chunk->[0]) . "-" . tr_chr($chunk->[1]);
3493 } elsif ($diff == 1) {
3494 $from .= tr_chr($chunk->[0]) . tr_chr($chunk->[1]);
3495 } else {
3496 $from .= tr_chr($chunk->[0]);
3497 }
3498 }
3499 for my $chunk (@to) {
3500 $diff = $chunk->[1] - $chunk->[0];
3501 if ($diff > 1) {
3502 $to .= tr_chr($chunk->[0]) . "-" . tr_chr($chunk->[1]);
3503 } elsif ($diff == 1) {
3504 $to .= tr_chr($chunk->[0]) . tr_chr($chunk->[1]);
3505 } else {
3506 $to .= tr_chr($chunk->[0]);
3507 }
3508 }
3509 #$final = sprintf("%04x", $final) if defined $final;
3510 #$none = sprintf("%04x", $none) if defined $none;
3511 #$extra = sprintf("%04x", $extra) if defined $extra;
3512 #print STDERR "final: $final\n none: $none\nextra: $extra\n";
3513 #print STDERR $swash{'LIST'}->PV;
3514 return (escape_str($from), escape_str($to));
3515}
3516
3517sub pp_trans {
3518 my $self = shift;
3519 my($op, $cx) = @_;
3520 my($from, $to);
3521 if (class($op) eq "PVOP") {
3522 ($from, $to) = tr_decode_byte($op->pv, $op->private);
3523 } else { # class($op) eq "SVOP"
3524 ($from, $to) = tr_decode_utf8($op->sv->RV, $op->private);
3525 }
3526 my $flags = "";
3527 $flags .= "c" if $op->private & OPpTRANS_COMPLEMENT;
3528 $flags .= "d" if $op->private & OPpTRANS_DELETE;
3529 $to = "" if $from eq $to and $flags eq "";
3530 $flags .= "s" if $op->private & OPpTRANS_SQUASH;
6e90668e
SM
3531 return "tr" . double_delim($from, $to) . $flags;
3532}
3533
3534# Like dq(), but different
3535sub re_dq {
3536 my $self = shift;
a9760014
RH
3537 my ($op, $extended) = @_;
3538
3f872cb9
GS
3539 my $type = $op->name;
3540 if ($type eq "const") {
f3402b25 3541 return '$[' if $op->private & OPpCONST_ARYBASE;
a9760014
RH
3542 my $unbacked = re_unback($self->const_sv($op)->as_string);
3543 return re_uninterp_extended(escape_extended_re($unbacked))
3544 if $extended;
3545 return re_uninterp(escape_str($unbacked));
3f872cb9 3546 } elsif ($type eq "concat") {
a9760014
RH
3547 my $first = $self->re_dq($op->first, $extended);
3548 my $last = $self->re_dq($op->last, $extended);
b73b7152 3549
a0e66df8 3550 # Disambiguate "${foo}bar", "${foo}{bar}", "${foo}[1]"
b73b7152
JH
3551 ($last =~ /^[A-Z\\\^\[\]_?]/ &&
3552 $first =~ s/([\$@])\^$/${1}{^}/) # "${^}W" etc
3553 || ($last =~ /^[{\[\w_]/ &&
3554 $first =~ s/([\$@])([A-Za-z_]\w*)$/${1}{$2}/);
3555
a0e66df8 3556 return $first . $last;
3f872cb9 3557 } elsif ($type eq "uc") {
a9760014 3558 return '\U' . $self->re_dq($op->first->sibling, $extended) . '\E';
3f872cb9 3559 } elsif ($type eq "lc") {
a9760014 3560 return '\L' . $self->re_dq($op->first->sibling, $extended) . '\E';
3f872cb9 3561 } elsif ($type eq "ucfirst") {
a9760014 3562 return '\u' . $self->re_dq($op->first->sibling, $extended);
3f872cb9 3563 } elsif ($type eq "lcfirst") {
a9760014 3564 return '\l' . $self->re_dq($op->first->sibling, $extended);
3f872cb9 3565 } elsif ($type eq "quotemeta") {
a9760014 3566 return '\Q' . $self->re_dq($op->first->sibling, $extended) . '\E';
3f872cb9 3567 } elsif ($type eq "join") {
9d2c6865 3568 return $self->deparse($op->last, 26); # was join($", @ary)
6e90668e 3569 } else {
9d2c6865 3570 return $self->deparse($op, 26);
6e90668e
SM
3571 }
3572}
3573
a9760014
RH
3574sub pure_string {
3575 my ($self, $op) = @_;
3576 my $type = $op->name;
3577
3578 if ($type eq 'const') {
3579 return 1;
3580 }
3581 elsif ($type =~ /^[ul]c(first)?$/ || $type eq 'quotemeta') {
3582 return $self->pure_string($op->first->sibling);
3583 }
3584 elsif ($type eq 'join') {
3585 my $join_op = $op->first->sibling; # Skip pushmark
3586 return 0 unless $join_op->name eq 'null' && $join_op->targ eq OP_RV2SV;
3587
3588 my $gvop = $join_op->first;
3589 return 0 unless $gvop->name eq 'gvsv';
3590 return 0 unless '"' eq $self->gv_name($self->gv_or_padgv($gvop));
3591
3592 return 0 unless ${$join_op->sibling} eq ${$op->last};
3593 return 0 unless $op->last->name =~ /^(rv2|pad)av$/;
3594 }
3595 elsif ($type eq 'concat') {
3596 return $self->pure_string($op->first)
3597 && $self->pure_string($op->last);
3598 }
3599 elsif (is_scalar($op) || $type =~ /^[ah]elem(fast)?$/) {
3600 return 1;
3601 }
3602 else {
3603 return 0;
3604 }
3605
3606 return 1;
3607}
3608
3609sub regcomp {
6e90668e 3610 my $self = shift;
a9760014 3611 my($op, $cx, $extended) = @_;
6e90668e 3612 my $kid = $op->first;
3f872cb9
GS
3613 $kid = $kid->first if $kid->name eq "regcmaybe";
3614 $kid = $kid->first if $kid->name eq "regcreset";
a9760014
RH
3615 return ($self->re_dq($kid, $extended), 1) if $self->pure_string($kid);
3616 return ($self->deparse($kid, $cx), 0);
3617}
3618
3619sub pp_regcomp {
3620 my ($self, $op, $cx) = @_;
3621 return (($self->regcomp($op, $cx, 0))[0]);
6e90668e
SM
3622}
3623
6e90668e
SM
3624# osmic acid -- see osmium tetroxide
3625
3626my %matchwords;
3627map($matchwords{join "", sort split //, $_} = $_, 'cig', 'cog', 'cos', 'cogs',
3628 'cox', 'go', 'is', 'ism', 'iso', 'mig', 'mix', 'osmic', 'ox', 'sic',
3629 'sig', 'six', 'smog', 'so', 'soc', 'sog', 'xi');
3630
90be192f 3631sub matchop {
6e90668e 3632 my $self = shift;
90be192f 3633 my($op, $cx, $name, $delim) = @_;