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alternate way to figure out prototypes
[perl5.git] / ext / B / B / Deparse.pm
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6e90668e 1# B::Deparse.pm
6f611a1a 2# Copyright (c) 1998, 1999, 2000 Stephen McCamant. All rights reserved.
6e90668e
SM
3# This module is free software; you can redistribute and/or modify
4# it under the same terms as Perl itself.
5
6# This is based on the module of the same name by Malcolm Beattie,
7# but essentially none of his code remains.
8
a798dbf2 9package B::Deparse;
f4a44678 10use Carp 'cluck', 'croak';
7a9b44b9 11use B qw(class main_root main_start main_cv svref_2object opnumber cstring
bd0865ec 12 OPf_WANT OPf_WANT_VOID OPf_WANT_SCALAR OPf_WANT_LIST
90c0eb26 13 OPf_KIDS OPf_REF OPf_STACKED OPf_SPECIAL OPf_MOD
ce4e655d 14 OPpLVAL_INTRO OPpOUR_INTRO OPpENTERSUB_AMPER OPpSLICE OPpCONST_BARE
3ed82cfc 15 OPpTRANS_SQUASH OPpTRANS_DELETE OPpTRANS_COMPLEMENT OPpTARGET_MY
7e80da18
RH
16 OPpCONST_ARYBASE OPpEXISTS_SUB OPpSORT_NUMERIC OPpSORT_INTEGER
17 OPpSORT_REVERSE
ce4e655d 18 SVf_IOK SVf_NOK SVf_ROK SVf_POK SVpad_OUR
6aaf4108 19 CVf_METHOD CVf_LOCKED CVf_LVALUE
fcd95d64 20 PMf_KEEP PMf_GLOBAL PMf_CONTINUE PMf_EVAL PMf_ONCE PMf_SKIPWHITE
bd0865ec 21 PMf_MULTILINE PMf_SINGLELINE PMf_FOLD PMf_EXTENDED);
d2bc402e 22$VERSION = 0.62;
a798dbf2 23use strict;
34a48b4b 24use warnings ();
a798dbf2 25
6e90668e
SM
26# Changes between 0.50 and 0.51:
27# - fixed nulled leave with live enter in sort { }
28# - fixed reference constants (\"str")
29# - handle empty programs gracefully
30# - handle infinte loops (for (;;) {}, while (1) {})
31# - differentiate between `for my $x ...' and `my $x; for $x ...'
32# - various minor cleanups
33# - moved globals into an object
34# - added `-u', like B::C
35# - package declarations using cop_stash
36# - subs, formats and code sorted by cop_seq
f6f9bdb7 37# Changes between 0.51 and 0.52:
4d1ff10f 38# - added pp_threadsv (special variables under USE_5005THREADS)
f6f9bdb7 39# - added documentation
bd0865ec 40# Changes between 0.52 and 0.53:
9d2c6865
SM
41# - many changes adding precedence contexts and associativity
42# - added `-p' and `-s' output style options
43# - various other minor fixes
bd0865ec 44# Changes between 0.53 and 0.54:
d7f5b6da
SM
45# - added support for new `for (1..100)' optimization,
46# thanks to Gisle Aas
bd0865ec 47# Changes between 0.54 and 0.55:
90be192f
SM
48# - added support for new qr// construct
49# - added support for new pp_regcreset OP
bd0865ec 50# Changes between 0.55 and 0.56:
f5aa8f4e
SM
51# - tested on base/*.t, cmd/*.t, comp/*.t, io/*.t
52# - fixed $# on non-lexicals broken in last big rewrite
53# - added temporary fix for change in opcode of OP_STRINGIFY
54# - fixed problem in 0.54's for() patch in `for (@ary)'
55# - fixed precedence in conditional of ?:
56# - tweaked list paren elimination in `my($x) = @_'
57# - made continue-block detection trickier wrt. null ops
58# - fixed various prototype problems in pp_entersub
59# - added support for sub prototypes that never get GVs
60# - added unquoting for special filehandle first arg in truncate
61# - print doubled rv2gv (a bug) as `*{*GV}' instead of illegal `**GV'
62# - added semicolons at the ends of blocks
63# - added -l `#line' declaration option -- fixes cmd/subval.t 27,28
bd0865ec
GS
64# Changes between 0.56 and 0.561:
65# - fixed multiply-declared my var in pp_truncate (thanks to Sarathy)
66# - used new B.pm symbolic constants (done by Nick Ing-Simmons)
67# Changes between 0.561 and 0.57:
68# - stylistic changes to symbolic constant stuff
69# - handled scope in s///e replacement code
70# - added unquote option for expanding "" into concats, etc.
71# - split method and proto parts of pp_entersub into separate functions
72# - various minor cleanups
f4a44678
SM
73# Changes after 0.57:
74# - added parens in \&foo (patch by Albert Dvornik)
75# Changes between 0.57 and 0.58:
76# - fixed `0' statements that weren't being printed
77# - added methods for use from other programs
78# (based on patches from James Duncan and Hugo van der Sanden)
79# - added -si and -sT to control indenting (also based on a patch from Hugo)
80# - added -sv to print something else instead of '???'
81# - preliminary version of utf8 tr/// handling
3ed82cfc
GS
82# Changes after 0.58:
83# - uses of $op->ppaddr changed to new $op->name (done by Sarathy)
84# - added support for Hugo's new OP_SETSTATE (like nextstate)
85# Changes between 0.58 and 0.59
86# - added support for Chip's OP_METHOD_NAMED
87# - added support for Ilya's OPpTARGET_MY optimization
88# - elided arrows before `()' subscripts when possible
58cccf98
SM
89# Changes between 0.59 and 0.60
90# - support for method attribues was added
91# - some warnings fixed
92# - separate recognition of constant subs
93# - rewrote continue block handling, now recoginizing for loops
94# - added more control of expanding control structures
c7f67cde
RH
95# Changes between 0.60 and 0.61 (mostly by Robin Houston)
96# - many bug-fixes
97# - support for pragmas and 'use'
98# - support for the little-used $[ variable
99# - support for __DATA__ sections
100# - UTF8 support
101# - BEGIN, CHECK, INIT and END blocks
102# - scoping of subroutine declarations fixed
103# - compile-time output from the input program can be suppressed, so that the
104# output is just the deparsed code. (a change to O.pm in fact)
105# - our() declarations
106# - *all* the known bugs are now listed in the BUGS section
107# - comprehensive test mechanism (TEST -deparse)
6e90668e
SM
108
109# Todo:
2a9e2f8a
RH
110# (See also BUGS section at the end of this file)
111#
f4a44678
SM
112# - finish tr/// changes
113# - add option for even more parens (generalize \&foo change)
90be192f 114# - left/right context
f4a44678 115# - treat top-level block specially for incremental output
58cccf98 116# - copy comments (look at real text with $^P?)
f5aa8f4e 117# - avoid semis in one-statement blocks
9d2c6865 118# - associativity of &&=, ||=, ?:
6e90668e
SM
119# - ',' => '=>' (auto-unquote?)
120# - break long lines ("\r" as discretionary break?)
f4a44678
SM
121# - configurable syntax highlighting: ANSI color, HTML, TeX, etc.
122# - more style options: brace style, hex vs. octal, quotes, ...
123# - print big ints as hex/octal instead of decimal (heuristic?)
3ed82cfc 124# - handle `my $x if 0'?
f5aa8f4e 125# - coordinate with Data::Dumper (both directions? see previous)
6e90668e
SM
126# - version using op_next instead of op_first/sibling?
127# - avoid string copies (pass arrays, one big join?)
9d2c6865 128# - here-docs?
6e90668e 129
f5aa8f4e 130# Tests that will always fail:
2a9e2f8a 131# (see t/TEST for the short list)
f5aa8f4e 132
6e90668e
SM
133# Object fields (were globals):
134#
135# avoid_local:
136# (local($a), local($b)) and local($a, $b) have the same internal
137# representation but the short form looks better. We notice we can
138# use a large-scale local when checking the list, but need to prevent
139# individual locals too. This hash holds the addresses of OPs that
140# have already had their local-ness accounted for. The same thing
141# is done with my().
142#
143# curcv:
144# CV for current sub (or main program) being deparsed
145#
8510e997
RH
146# curcvlex:
147# Cached hash of lexical variables for curcv: keys are names,
148# each value is an array of pairs, indicating the cop_seq of scopes
149# in which a var of that name is valid.
150#
34a48b4b
RH
151# curcop:
152# COP for statement being deparsed
153#
6e90668e
SM
154# curstash:
155# name of the current package for deparsed code
156#
157# subs_todo:
34a48b4b 158# array of [cop_seq, CV, is_format?] for subs and formats we still
6e90668e
SM
159# want to deparse
160#
f5aa8f4e
SM
161# protos_todo:
162# as above, but [name, prototype] for subs that never got a GV
163#
6e90668e
SM
164# subs_done, forms_done:
165# keys are addresses of GVs for subs and formats we've already
166# deparsed (or at least put into subs_todo)
9d2c6865 167#
0ca62a8e
RH
168# subs_declared
169# keys are names of subs for which we've printed declarations.
170# That means we can omit parentheses from the arguments.
171#
1d38190f
RGS
172# subs_deparsed
173# Keeps track of fully qualified names of all deparsed subs.
174#
9d2c6865 175# parens: -p
f5aa8f4e 176# linenums: -l
bd0865ec 177# unquote: -q
9d2c6865 178# cuddle: ` ' or `\n', depending on -sC
f4a44678
SM
179# indent_size: -si
180# use_tabs: -sT
181# ex_const: -sv
9d2c6865
SM
182
183# A little explanation of how precedence contexts and associativity
184# work:
185#
186# deparse() calls each per-op subroutine with an argument $cx (short
187# for context, but not the same as the cx* in the perl core), which is
188# a number describing the op's parents in terms of precedence, whether
f5aa8f4e 189# they're inside an expression or at statement level, etc. (see
9d2c6865
SM
190# chart below). When ops with children call deparse on them, they pass
191# along their precedence. Fractional values are used to implement
192# associativity (`($x + $y) + $z' => `$x + $y + $y') and related
193# parentheses hacks. The major disadvantage of this scheme is that
194# it doesn't know about right sides and left sides, so say if you
195# assign a listop to a variable, it can't tell it's allowed to leave
196# the parens off the listop.
197
198# Precedences:
199# 26 [TODO] inside interpolation context ("")
200# 25 left terms and list operators (leftward)
201# 24 left ->
202# 23 nonassoc ++ --
203# 22 right **
204# 21 right ! ~ \ and unary + and -
205# 20 left =~ !~
206# 19 left * / % x
207# 18 left + - .
208# 17 left << >>
209# 16 nonassoc named unary operators
210# 15 nonassoc < > <= >= lt gt le ge
211# 14 nonassoc == != <=> eq ne cmp
212# 13 left &
213# 12 left | ^
214# 11 left &&
215# 10 left ||
216# 9 nonassoc .. ...
217# 8 right ?:
218# 7 right = += -= *= etc.
219# 6 left , =>
220# 5 nonassoc list operators (rightward)
221# 4 right not
222# 3 left and
223# 2 left or xor
224# 1 statement modifiers
225# 0 statement level
226
6ec152c3
RH
227# Also, lineseq may pass a fourth parameter to the pp_ routines:
228# if present, the fourth parameter is passed on by deparse.
229#
230# If present and true, it means that the op exists directly as
ce4e655d 231# part of a lineseq. Currently it's only used by scopeop to
6ec152c3
RH
232# decide whether its results need to be enclosed in a do {} block.
233
9d2c6865
SM
234# Nonprinting characters with special meaning:
235# \cS - steal parens (see maybe_parens_unop)
236# \n - newline and indent
237# \t - increase indent
238# \b - decrease indent (`outdent')
f5aa8f4e 239# \f - flush left (no indent)
9d2c6865 240# \cK - kill following semicolon, if any
6e90668e
SM
241
242sub null {
243 my $op = shift;
244 return class($op) eq "NULL";
245}
246
247sub todo {
248 my $self = shift;
34a48b4b 249 my($cv, $is_form) = @_;
e31885a0 250 return unless ($cv->FILE eq $0 || exists $self->{files}{$cv->FILE});
6e90668e
SM
251 my $seq;
252 if (!null($cv->START) and is_state($cv->START)) {
253 $seq = $cv->START->cop_seq;
254 } else {
255 $seq = 0;
256 }
34a48b4b 257 push @{$self->{'subs_todo'}}, [$seq, $cv, $is_form];
1d38190f
RGS
258 unless ($is_form || class($cv->STASH) eq 'SPECIAL') {
259 $self->{'subs_deparsed'}{$cv->STASH->NAME."::".$cv->GV->NAME} = 1;
260 }
6e90668e
SM
261}
262
263sub next_todo {
264 my $self = shift;
265 my $ent = shift @{$self->{'subs_todo'}};
34a48b4b
RH
266 my $cv = $ent->[1];
267 my $gv = $cv->GV;
268 my $name = $self->gv_name($gv);
6e90668e
SM
269 if ($ent->[2]) {
270 return "format $name =\n"
e31885a0 271 . $self->deparse_format($ent->[1]). "\n";
6e90668e 272 } else {
0ca62a8e 273 $self->{'subs_declared'}{$name} = 1;
34a48b4b
RH
274 if ($name eq "BEGIN") {
275 my $use_dec = $self->begin_is_use($cv);
0e7fe0f0
RH
276 if (defined ($use_dec)) {
277 return () if 0 == length($use_dec);
278 return $use_dec;
279 }
34a48b4b 280 }
a0035eb8
RH
281 my $l = '';
282 if ($self->{'linenums'}) {
283 my $line = $gv->LINE;
284 my $file = $gv->FILE;
285 $l = "\n\f#line $line \"$file\"\n";
286 }
287 return "${l}sub $name " . $self->deparse_sub($cv);
34a48b4b
RH
288 }
289}
290
291# Return a "use" declaration for this BEGIN block, if appropriate
292sub begin_is_use {
293 my ($self, $cv) = @_;
294 my $root = $cv->ROOT;
80dc0729 295 local @$self{qw'curcv curcvlex'} = ($cv);
34a48b4b
RH
296#require B::Debug;
297#B::walkoptree($cv->ROOT, "debug");
298 my $lineseq = $root->first;
299 return if $lineseq->name ne "lineseq";
300
301 my $req_op = $lineseq->first->sibling;
302 return if $req_op->name ne "require";
303
304 my $module;
305 if ($req_op->first->private & OPpCONST_BARE) {
306 # Actually it should always be a bareword
307 $module = $self->const_sv($req_op->first)->PV;
308 $module =~ s[/][::]g;
309 $module =~ s/.pm$//;
310 }
311 else {
312 $module = const($self->const_sv($req_op->first));
313 }
314
315 my $version;
316 my $version_op = $req_op->sibling;
317 return if class($version_op) eq "NULL";
318 if ($version_op->name eq "lineseq") {
319 # We have a version parameter; skip nextstate & pushmark
320 my $constop = $version_op->first->next->next;
321
322 return unless $self->const_sv($constop)->PV eq $module;
323 $constop = $constop->sibling;
34a48b4b
RH
324 $version = $self->const_sv($constop)->int_value;
325 $constop = $constop->sibling;
326 return if $constop->name ne "method_named";
327 return if $self->const_sv($constop)->PV ne "VERSION";
328 }
329
330 $lineseq = $version_op->sibling;
331 return if $lineseq->name ne "lineseq";
332 my $entersub = $lineseq->first->sibling;
333 if ($entersub->name eq "stub") {
334 return "use $module $version ();\n" if defined $version;
335 return "use $module ();\n";
336 }
337 return if $entersub->name ne "entersub";
338
339 # See if there are import arguments
340 my $args = '';
341
6ec152c3
RH
342 my $svop = $entersub->first->sibling; # Skip over pushmark
343 return unless $self->const_sv($svop)->PV eq $module;
34a48b4b
RH
344
345 # Pull out the arguments
6ec152c3
RH
346 for ($svop=$svop->sibling; $svop->name ne "method_named";
347 $svop = $svop->sibling) {
34a48b4b 348 $args .= ", " if length($args);
6ec152c3 349 $args .= $self->deparse($svop, 6);
34a48b4b
RH
350 }
351
352 my $use = 'use';
6ec152c3 353 my $method_named = $svop;
34a48b4b
RH
354 return if $method_named->name ne "method_named";
355 my $method_name = $self->const_sv($method_named)->PV;
356
357 if ($method_name eq "unimport") {
358 $use = 'no';
359 }
360
361 # Certain pragmas are dealt with using hint bits,
362 # so we ignore them here
363 if ($module eq 'strict' || $module eq 'integer'
0e7fe0f0 364 || $module eq 'bytes' || $module eq 'warnings') {
34a48b4b
RH
365 return "";
366 }
367
368 if (defined $version && length $args) {
369 return "$use $module $version ($args);\n";
370 } elsif (defined $version) {
371 return "$use $module $version;\n";
372 } elsif (length $args) {
373 return "$use $module ($args);\n";
374 } else {
375 return "$use $module;\n";
6e90668e
SM
376 }
377}
378
6e90668e 379sub stash_subs {
34a48b4b
RH
380 my ($self, $pack) = @_;
381 my (@ret, $stash);
382 if (!defined $pack) {
383 $pack = '';
384 $stash = \%::;
f5aa8f4e 385 }
34a48b4b
RH
386 else {
387 $pack =~ s/(::)?$/::/;
388 no strict 'refs';
389 $stash = \%$pack;
390 }
391 my %stash = svref_2object($stash)->ARRAY;
392 while (my ($key, $val) = each %stash) {
393 next if $key eq 'main::'; # avoid infinite recursion
f5aa8f4e
SM
394 my $class = class($val);
395 if ($class eq "PV") {
a0035eb8
RH
396 # Just a prototype. As an ugly but fairly effective way
397 # to find out if it belongs here is to see if the AUTOLOAD
398 # (if any) for the stash was defined in one of our files.
399 my $A = $stash{"AUTOLOAD"};
400 if (defined ($A) && class($A) eq "GV" && defined($A->CV)
401 && class($A->CV) eq "CV") {
402 my $AF = $A->FILE;
403 next unless $AF eq $0 || exists $self->{'files'}{$AF};
404 }
f5aa8f4e
SM
405 push @{$self->{'protos_todo'}}, [$pack . $key, $val->PV];
406 } elsif ($class eq "IV") {
a0035eb8
RH
407 # Just a name. As above.
408 my $A = $stash{"AUTOLOAD"};
409 if (defined ($A) && class($A) eq "GV" && defined($A->CV)
410 && class($A->CV) eq "CV") {
411 my $AF = $A->FILE;
412 next unless $AF eq $0 || exists $self->{'files'}{$AF};
413 }
f5aa8f4e
SM
414 push @{$self->{'protos_todo'}}, [$pack . $key, undef];
415 } elsif ($class eq "GV") {
34a48b4b 416 if (class(my $cv = $val->CV) ne "SPECIAL") {
f5aa8f4e 417 next if $self->{'subs_done'}{$$val}++;
e31885a0 418 next if $$val != ${$cv->GV}; # Ignore imposters
8510e997 419 $self->todo($cv, 0);
f5aa8f4e 420 }
e31885a0 421 if (class(my $cv = $val->FORM) ne "SPECIAL") {
f5aa8f4e 422 next if $self->{'forms_done'}{$$val}++;
e31885a0
RH
423 next if $$val != ${$cv->GV}; # Ignore imposters
424 $self->todo($cv, 1);
f5aa8f4e 425 }
34a48b4b
RH
426 if (class($val->HV) ne "SPECIAL" && $key =~ /::$/) {
427 $self->stash_subs($pack . $key);
428 }
6e90668e
SM
429 }
430 }
431}
a798dbf2 432
f5aa8f4e
SM
433sub print_protos {
434 my $self = shift;
435 my $ar;
436 my @ret;
437 foreach $ar (@{$self->{'protos_todo'}}) {
438 my $proto = (defined $ar->[1] ? " (". $ar->[1] . ")" : "");
439 push @ret, "sub " . $ar->[0] . "$proto;\n";
440 }
441 delete $self->{'protos_todo'};
442 return @ret;
443}
444
9d2c6865
SM
445sub style_opts {
446 my $self = shift;
447 my $opts = shift;
448 my $opt;
449 while (length($opt = substr($opts, 0, 1))) {
450 if ($opt eq "C") {
451 $self->{'cuddle'} = " ";
f4a44678
SM
452 $opts = substr($opts, 1);
453 } elsif ($opt eq "i") {
454 $opts =~ s/^i(\d+)//;
455 $self->{'indent_size'} = $1;
456 } elsif ($opt eq "T") {
457 $self->{'use_tabs'} = 1;
458 $opts = substr($opts, 1);
459 } elsif ($opt eq "v") {
460 $opts =~ s/^v([^.]*)(.|$)//;
461 $self->{'ex_const'} = $1;
9d2c6865 462 }
9d2c6865
SM
463 }
464}
465
f4a44678
SM
466sub new {
467 my $class = shift;
468 my $self = bless {}, $class;
469 $self->{'subs_todo'} = [];
34a48b4b 470 $self->{'files'} = {};
f4a44678 471 $self->{'curstash'} = "main";
34a48b4b 472 $self->{'curcop'} = undef;
f4a44678
SM
473 $self->{'cuddle'} = "\n";
474 $self->{'indent_size'} = 4;
475 $self->{'use_tabs'} = 0;
793e2a70
RH
476 $self->{'expand'} = 0;
477 $self->{'unquote'} = 0;
478 $self->{'linenums'} = 0;
479 $self->{'parens'} = 0;
f4a44678 480 $self->{'ex_const'} = "'???'";
08c6f5ec
RH
481
482 $self->{'ambient_arybase'} = 0;
e31885a0 483 $self->{'ambient_warnings'} = undef; # Assume no lexical warnings
a0405c92 484 $self->{'ambient_hints'} = 0;
08c6f5ec
RH
485 $self->init();
486
f4a44678 487 while (my $arg = shift @_) {
34a48b4b
RH
488 if ($arg =~ /^-f(.*)/) {
489 $self->{'files'}{$1} = 1;
f4a44678
SM
490 } elsif ($arg eq "-p") {
491 $self->{'parens'} = 1;
492 } elsif ($arg eq "-l") {
493 $self->{'linenums'} = 1;
494 } elsif ($arg eq "-q") {
495 $self->{'unquote'} = 1;
496 } elsif (substr($arg, 0, 2) eq "-s") {
497 $self->style_opts(substr $arg, 2);
58cccf98
SM
498 } elsif ($arg =~ /^-x(\d)$/) {
499 $self->{'expand'} = $1;
f4a44678
SM
500 }
501 }
502 return $self;
503}
504
810aef70
RH
505{
506 # Mask out the bits that L<warnings::register> uses
507 my $WARN_MASK;
508 BEGIN {
509 $WARN_MASK = $warnings::Bits{all} | $warnings::DeadBits{all};
510 }
511 sub WARN_MASK () {
512 return $WARN_MASK;
513 }
34a48b4b
RH
514}
515
08c6f5ec
RH
516# Initialise the contextual information, either from
517# defaults provided with the ambient_pragmas method,
518# or from perl's own defaults otherwise.
519sub init {
520 my $self = shift;
521
522 $self->{'arybase'} = $self->{'ambient_arybase'};
e31885a0
RH
523 $self->{'warnings'} = defined ($self->{'ambient_warnings'})
524 ? $self->{'ambient_warnings'} & WARN_MASK
525 : undef;
a0405c92 526 $self->{'hints'} = $self->{'ambient_hints'} & 0xFF;
217aba5d
RH
527
528 # also a convenient place to clear out subs_declared
529 delete $self->{'subs_declared'};
08c6f5ec
RH
530}
531
a798dbf2 532sub compile {
6e90668e
SM
533 my(@args) = @_;
534 return sub {
f4a44678 535 my $self = B::Deparse->new(@args);
d2bc402e
RGS
536 # First deparse command-line args
537 if (defined $^I) { # deparse -i
538 print q(BEGIN { $^I = ).cstring($^I).qq(; }\n);
539 }
540 if ($^W) { # deparse -w
541 print qq(BEGIN { \$^W = $^W; }\n);
542 }
543 if ($/ ne "\n" or defined $O::savebackslash) { # deparse -l and -0
544 my $fs = cstring($/) || 'undef';
545 my $bs = cstring($O::savebackslash) || 'undef';
546 print qq(BEGIN { \$/ = $fs; \$\\ = $bs; }\n);
547 }
34a48b4b
RH
548 my @BEGINs = B::begin_av->isa("B::AV") ? B::begin_av->ARRAY : ();
549 my @INITs = B::init_av->isa("B::AV") ? B::init_av->ARRAY : ();
550 my @ENDs = B::end_av->isa("B::AV") ? B::end_av->ARRAY : ();
551 for my $block (@BEGINs, @INITs, @ENDs) {
e31885a0 552 $self->todo($block, 0);
34a48b4b
RH
553 }
554 $self->stash_subs();
6e90668e 555 $self->{'curcv'} = main_cv;
8510e997 556 $self->{'curcvlex'} = undef;
f5aa8f4e 557 print $self->print_protos;
6e90668e 558 @{$self->{'subs_todo'}} =
f4a44678
SM
559 sort {$a->[0] <=> $b->[0]} @{$self->{'subs_todo'}};
560 print $self->indent($self->deparse(main_root, 0)), "\n"
561 unless null main_root;
6e90668e
SM
562 my @text;
563 while (scalar(@{$self->{'subs_todo'}})) {
564 push @text, $self->next_todo;
565 }
6f611a1a 566 print $self->indent(join("", @text)), "\n" if @text;
e31885a0
RH
567
568 # Print __DATA__ section, if necessary
569 no strict 'refs';
96c57f7e
RGS
570 my $laststash = defined $self->{'curcop'}
571 ? $self->{'curcop'}->stash->NAME : $self->{'curstash'};
572 if (defined *{$laststash."::DATA"}{IO}) {
e31885a0 573 print "__DATA__\n";
96c57f7e 574 print readline(*{$laststash."::DATA"});
e31885a0 575 }
a798dbf2 576 }
a798dbf2
MB
577}
578
f4a44678
SM
579sub coderef2text {
580 my $self = shift;
581 my $sub = shift;
582 croak "Usage: ->coderef2text(CODEREF)" unless ref($sub) eq "CODE";
08c6f5ec
RH
583
584 $self->init();
f4a44678
SM
585 return $self->indent($self->deparse_sub(svref_2object($sub)));
586}
587
08c6f5ec
RH
588sub ambient_pragmas {
589 my $self = shift;
e31885a0 590 my ($arybase, $hint_bits, $warning_bits) = (0, 0);
08c6f5ec
RH
591
592 while (@_ > 1) {
593 my $name = shift();
594 my $val = shift();
595
596 if ($name eq 'strict') {
597 require strict;
598
599 if ($val eq 'none') {
600 $hint_bits &= ~strict::bits(qw/refs subs vars/);
601 next();
602 }
603
604 my @names;
605 if ($val eq "all") {
606 @names = qw/refs subs vars/;
607 }
608 elsif (ref $val) {
609 @names = @$val;
610 }
611 else {
a0405c92 612 @names = split' ', $val;
08c6f5ec
RH
613 }
614 $hint_bits |= strict::bits(@names);
615 }
616
617 elsif ($name eq '$[') {
618 $arybase = $val;
619 }
620
a0405c92
RH
621 elsif ($name eq 'integer'
622 || $name eq 'bytes'
623 || $name eq 'utf8') {
624 require "$name.pm";
08c6f5ec 625 if ($val) {
a0405c92
RH
626 $hint_bits |= ${$::{"${name}::"}{"hint_bits"}};
627 }
628 else {
629 $hint_bits &= ~${$::{"${name}::"}{"hint_bits"}};
630 }
631 }
632
633 elsif ($name eq 're') {
634 require re;
635 if ($val eq 'none') {
2570cdf1 636 $hint_bits &= ~re::bits(qw/taint eval/);
a0405c92
RH
637 next();
638 }
639
640 my @names;
641 if ($val eq 'all') {
2570cdf1 642 @names = qw/taint eval/;
a0405c92
RH
643 }
644 elsif (ref $val) {
645 @names = @$val;
08c6f5ec
RH
646 }
647 else {
a0405c92 648 @names = split' ',$val;
08c6f5ec 649 }
a0405c92 650 $hint_bits |= re::bits(@names);
08c6f5ec
RH
651 }
652
653 elsif ($name eq 'warnings') {
08c6f5ec 654 if ($val eq 'none') {
810aef70 655 $warning_bits = $warnings::NONE;
08c6f5ec
RH
656 next();
657 }
658
659 my @names;
660 if (ref $val) {
661 @names = @$val;
662 }
663 else {
664 @names = split/\s+/, $val;
665 }
666
810aef70 667 $warning_bits = $warnings::NONE if !defined ($warning_bits);
08c6f5ec
RH
668 $warning_bits |= warnings::bits(@names);
669 }
670
671 elsif ($name eq 'warning_bits') {
672 $warning_bits = $val;
673 }
674
675 elsif ($name eq 'hint_bits') {
676 $hint_bits = $val;
677 }
678
679 else {
680 croak "Unknown pragma type: $name";
681 }
682 }
683 if (@_) {
684 croak "The ambient_pragmas method expects an even number of args";
685 }
686
687 $self->{'ambient_arybase'} = $arybase;
688 $self->{'ambient_warnings'} = $warning_bits;
a0405c92 689 $self->{'ambient_hints'} = $hint_bits;
08c6f5ec
RH
690}
691
6e90668e
SM
692sub deparse {
693 my $self = shift;
6ec152c3 694 my($op, $cx, $flags) = @_;
34a48b4b
RH
695
696 Carp::confess("Null op in deparse") if !defined($op)
697 || class($op) eq "NULL";
3f872cb9 698 my $meth = "pp_" . $op->name;
ce4e655d
RH
699 if (is_scope($op)) {
700 return $self->$meth($op, $cx, $flags);
6ec152c3 701 }
9d2c6865 702 return $self->$meth($op, $cx);
a798dbf2
MB
703}
704
6e90668e 705sub indent {
f4a44678 706 my $self = shift;
6e90668e
SM
707 my $txt = shift;
708 my @lines = split(/\n/, $txt);
709 my $leader = "";
f4a44678 710 my $level = 0;
6e90668e
SM
711 my $line;
712 for $line (@lines) {
f4a44678
SM
713 my $cmd = substr($line, 0, 1);
714 if ($cmd eq "\t" or $cmd eq "\b") {
715 $level += ($cmd eq "\t" ? 1 : -1) * $self->{'indent_size'};
716 if ($self->{'use_tabs'}) {
717 $leader = "\t" x ($level / 8) . " " x ($level % 8);
718 } else {
719 $leader = " " x $level;
720 }
6e90668e
SM
721 $line = substr($line, 1);
722 }
f5aa8f4e
SM
723 if (substr($line, 0, 1) eq "\f") {
724 $line = substr($line, 1); # no indent
725 } else {
726 $line = $leader . $line;
727 }
9d2c6865 728 $line =~ s/\cK;?//g;
6e90668e
SM
729 }
730 return join("\n", @lines);
731}
732
6e90668e
SM
733sub deparse_sub {
734 my $self = shift;
735 my $cv = shift;
736 my $proto = "";
ce4e655d 737Carp::confess("NULL in deparse_sub") if !defined($cv) || $cv->isa("B::NULL");
34a48b4b
RH
738Carp::confess("SPECIAL in deparse_sub") if $cv->isa("B::SPECIAL");
739 local $self->{'curcop'} = $self->{'curcop'};
6e90668e
SM
740 if ($cv->FLAGS & SVf_POK) {
741 $proto = "(". $cv->PV . ") ";
742 }
6aaf4108
SC
743 if ($cv->CvFLAGS & (CVf_METHOD|CVf_LOCKED|CVf_LVALUE)) {
744 $proto .= ": ";
745 $proto .= "lvalue " if $cv->CvFLAGS & CVf_LVALUE;
746 $proto .= "locked " if $cv->CvFLAGS & CVf_LOCKED;
747 $proto .= "method " if $cv->CvFLAGS & CVf_METHOD;
748 }
749
6e90668e 750 local($self->{'curcv'}) = $cv;
8510e997 751 local($self->{'curcvlex'});
a0405c92
RH
752 local(@$self{qw'curstash warnings hints'})
753 = @$self{qw'curstash warnings hints'};
ce4e655d 754 my $body;
6e90668e 755 if (not null $cv->ROOT) {
ce4e655d
RH
756 my $lineseq = $cv->ROOT->first;
757 if ($lineseq->name eq "lineseq") {
758 my @ops;
759 for(my$o=$lineseq->first; $$o; $o=$o->sibling) {
760 push @ops, $o;
761 }
762 $body = $self->lineseq(undef, @ops).";";
763 my $scope_en = $self->find_scope_en($lineseq);
764 if (defined $scope_en) {
765 my $subs = join"", $self->seq_subs($scope_en);
766 $body .= ";\n$subs" if length($subs);
767 }
768 }
769 else {
770 $body = $self->deparse($cv->ROOT->first, 0);
771 }
de3f1649 772 }
ce4e655d
RH
773 else {
774 my $sv = $cv->const_sv;
775 if ($$sv) {
776 # uh-oh. inlinable sub... format it differently
777 return $proto . "{ " . const($sv) . " }\n";
778 } else { # XSUB? (or just a declaration)
779 return "$proto;\n";
780 }
6e90668e 781 }
ce4e655d 782 return $proto ."{\n\t$body\n\b}" ."\n";
6e90668e
SM
783}
784
785sub deparse_format {
786 my $self = shift;
787 my $form = shift;
788 my @text;
789 local($self->{'curcv'}) = $form;
8510e997 790 local($self->{'curcvlex'});
67fc2416 791 local($self->{'in_format'}) = 1;
a0405c92 792 local(@$self{qw'curstash warnings hints'})
67fc2416 793 = @$self{qw'curstash warnings hints'};
6e90668e
SM
794 my $op = $form->ROOT;
795 my $kid;
32f2ae54 796 return "\f." if $op->first->name eq 'stub';
6e90668e
SM
797 $op = $op->first->first; # skip leavewrite, lineseq
798 while (not null $op) {
799 $op = $op->sibling; # skip nextstate
800 my @exprs;
801 $kid = $op->first->sibling; # skip pushmark
a5b0cd91 802 push @text, "\f".$self->const_sv($kid)->PV;
6e90668e
SM
803 $kid = $kid->sibling;
804 for (; not null $kid; $kid = $kid->sibling) {
9d2c6865 805 push @exprs, $self->deparse($kid, 0);
6e90668e 806 }
a5b0cd91 807 push @text, "\f".join(", ", @exprs)."\n" if @exprs;
6e90668e
SM
808 $op = $op->sibling;
809 }
a5b0cd91 810 return join("", @text) . "\f.";
6e90668e
SM
811}
812
6e90668e 813sub is_scope {
a798dbf2 814 my $op = shift;
3f872cb9
GS
815 return $op->name eq "leave" || $op->name eq "scope"
816 || $op->name eq "lineseq"
817 || ($op->name eq "null" && class($op) eq "UNOP"
818 && (is_scope($op->first) || $op->first->name eq "enter"));
6e90668e
SM
819}
820
821sub is_state {
3f872cb9
GS
822 my $name = $_[0]->name;
823 return $name eq "nextstate" || $name eq "dbstate" || $name eq "setstate";
6e90668e
SM
824}
825
826sub is_miniwhile { # check for one-line loop (`foo() while $y--')
827 my $op = shift;
828 return (!null($op) and null($op->sibling)
3f872cb9
GS
829 and $op->name eq "null" and class($op) eq "UNOP"
830 and (($op->first->name =~ /^(and|or)$/
831 and $op->first->first->sibling->name eq "lineseq")
832 or ($op->first->name eq "lineseq"
6e90668e 833 and not null $op->first->first->sibling
3f872cb9 834 and $op->first->first->sibling->name eq "unstack")
6e90668e
SM
835 ));
836}
837
838sub is_scalar {
839 my $op = shift;
3f872cb9
GS
840 return ($op->name eq "rv2sv" or
841 $op->name eq "padsv" or
842 $op->name eq "gv" or # only in array/hash constructs
bd0865ec 843 $op->flags & OPf_KIDS && !null($op->first)
3f872cb9 844 && $op->first->name eq "gvsv");
6e90668e
SM
845}
846
9d2c6865
SM
847sub maybe_parens {
848 my $self = shift;
849 my($text, $cx, $prec) = @_;
850 if ($prec < $cx # unary ops nest just fine
851 or $prec == $cx and $cx != 4 and $cx != 16 and $cx != 21
852 or $self->{'parens'})
853 {
854 $text = "($text)";
855 # In a unop, let parent reuse our parens; see maybe_parens_unop
856 $text = "\cS" . $text if $cx == 16;
857 return $text;
858 } else {
859 return $text;
860 }
861}
862
863# same as above, but get around the `if it looks like a function' rule
864sub maybe_parens_unop {
865 my $self = shift;
866 my($name, $kid, $cx) = @_;
867 if ($cx > 16 or $self->{'parens'}) {
a0035eb8
RH
868 $kid = $self->deparse($kid, 1);
869 if ($name eq "umask" && $kid =~ /^\d+$/) {
870 $kid = sprintf("%#o", $kid);
871 }
872 return "$name($kid)";
9d2c6865
SM
873 } else {
874 $kid = $self->deparse($kid, 16);
a0035eb8
RH
875 if ($name eq "umask" && $kid =~ /^\d+$/) {
876 $kid = sprintf("%#o", $kid);
877 }
9d2c6865
SM
878 if (substr($kid, 0, 1) eq "\cS") {
879 # use kid's parens
880 return $name . substr($kid, 1);
881 } elsif (substr($kid, 0, 1) eq "(") {
882 # avoid looks-like-a-function trap with extra parens
883 # (`+' can lead to ambiguities)
884 return "$name(" . $kid . ")";
885 } else {
886 return "$name $kid";
887 }
888 }
889}
890
891sub maybe_parens_func {
892 my $self = shift;
893 my($func, $text, $cx, $prec) = @_;
894 if ($prec <= $cx or substr($text, 0, 1) eq "(" or $self->{'parens'}) {
895 return "$func($text)";
896 } else {
897 return "$func $text";
898 }
899}
900
6e90668e
SM
901sub maybe_local {
902 my $self = shift;
9d2c6865 903 my($op, $cx, $text) = @_;
ce4e655d
RH
904 my $our_intro = ($op->name =~ /^(gv|rv2)[ash]v$/) ? OPpOUR_INTRO : 0;
905 if ($op->private & (OPpLVAL_INTRO|$our_intro)
906 and not $self->{'avoid_local'}{$$op}) {
907 my $our_local = ($op->private & OPpLVAL_INTRO) ? "local" : "our";
e8d3f51b 908 if (want_scalar($op)) {
ce4e655d 909 return "$our_local $text";
e8d3f51b 910 } else {
ce4e655d 911 return $self->maybe_parens_func("$our_local", $text, $cx, 16);
e8d3f51b 912 }
6e90668e
SM
913 } else {
914 return $text;
a798dbf2 915 }
a798dbf2
MB
916}
917
3ed82cfc
GS
918sub maybe_targmy {
919 my $self = shift;
920 my($op, $cx, $func, @args) = @_;
921 if ($op->private & OPpTARGET_MY) {
922 my $var = $self->padname($op->targ);
923 my $val = $func->($self, $op, 7, @args);
924 return $self->maybe_parens("$var = $val", $cx, 7);
925 } else {
926 return $func->($self, $op, $cx, @args);
927 }
928}
929
6e90668e
SM
930sub padname_sv {
931 my $self = shift;
932 my $targ = shift;
933 return (($self->{'curcv'}->PADLIST->ARRAY)[0]->ARRAY)[$targ];
934}
935
936sub maybe_my {
937 my $self = shift;
9d2c6865 938 my($op, $cx, $text) = @_;
4c1f658f 939 if ($op->private & OPpLVAL_INTRO and not $self->{'avoid_local'}{$$op}) {
e8d3f51b
RH
940 if (want_scalar($op)) {
941 return "my $text";
942 } else {
943 return $self->maybe_parens_func("my", $text, $cx, 16);
944 }
6e90668e
SM
945 } else {
946 return $text;
947 }
948}
949
9d2c6865
SM
950# The following OPs don't have functions:
951
952# pp_padany -- does not exist after parsing
9d2c6865
SM
953
954sub pp_enter { # see also leave
955 cluck "unexpected OP_ENTER";
956 return "XXX";
957}
958
959sub pp_pushmark { # see also list
960 cluck "unexpected OP_PUSHMARK";
961 return "XXX";
962}
963
964sub pp_leavesub { # see also deparse_sub
965 cluck "unexpected OP_LEAVESUB";
966 return "XXX";
967}
968
969sub pp_leavewrite { # see also deparse_format
970 cluck "unexpected OP_LEAVEWRITE";
971 return "XXX";
972}
973
974sub pp_method { # see also entersub
975 cluck "unexpected OP_METHOD";
976 return "XXX";
977}
978
979sub pp_regcmaybe { # see also regcomp
980 cluck "unexpected OP_REGCMAYBE";
981 return "XXX";
982}
983
90be192f
SM
984sub pp_regcreset { # see also regcomp
985 cluck "unexpected OP_REGCRESET";
986 return "XXX";
987}
988
9d2c6865
SM
989sub pp_substcont { # see also subst
990 cluck "unexpected OP_SUBSTCONT";
991 return "XXX";
992}
993
994sub pp_grepstart { # see also grepwhile
995 cluck "unexpected OP_GREPSTART";
996 return "XXX";
997}
998
999sub pp_mapstart { # see also mapwhile
1000 cluck "unexpected OP_MAPSTART";
1001 return "XXX";
1002}
1003
90c0eb26
RH
1004sub pp_method_named {
1005 cluck "unexpected OP_METHOD_NAMED";
1006 return "XXX";
1007}
1008
9d2c6865
SM
1009sub pp_flip { # see also flop
1010 cluck "unexpected OP_FLIP";
1011 return "XXX";
1012}
1013
1014sub pp_iter { # see also leaveloop
1015 cluck "unexpected OP_ITER";
1016 return "XXX";
1017}
1018
1019sub pp_enteriter { # see also leaveloop
1020 cluck "unexpected OP_ENTERITER";
1021 return "XXX";
1022}
1023
1024sub pp_enterloop { # see also leaveloop
1025 cluck "unexpected OP_ENTERLOOP";
1026 return "XXX";
1027}
1028
1029sub pp_leaveeval { # see also entereval
1030 cluck "unexpected OP_LEAVEEVAL";
1031 return "XXX";
1032}
1033
1034sub pp_entertry { # see also leavetry
1035 cluck "unexpected OP_ENTERTRY";
1036 return "XXX";
1037}
6e90668e 1038
ce4e655d
RH
1039# $root should be the op which represents the root of whatever
1040# we're sequencing here. If it's undefined, then we don't append
1041# any subroutine declarations to the deparsed ops, otherwise we
1042# append appropriate declarations.
58cccf98 1043sub lineseq {
ce4e655d 1044 my($self, $root, @ops) = @_;
58cccf98 1045 my($expr, @exprs);
ce4e655d
RH
1046
1047 my $out_cop = $self->{'curcop'};
1048 my $out_seq = defined($out_cop) ? $out_cop->cop_seq : undef;
1049 my $limit_seq;
1050 if (defined $root) {
1051 $limit_seq = $out_seq;
1052 my $nseq = $self->find_scope_st($root->sibling) if ${$root->sibling};
1053 $limit_seq = $nseq if !defined($limit_seq)
1054 or defined($nseq) && $nseq < $limit_seq;
1055 }
1056 $limit_seq = $self->{'limit_seq'}
1057 if defined($self->{'limit_seq'})
1058 && (!defined($limit_seq) || $self->{'limit_seq'} < $limit_seq);
1059 local $self->{'limit_seq'} = $limit_seq;
58cccf98 1060 for (my $i = 0; $i < @ops; $i++) {
6e90668e 1061 $expr = "";
58cccf98
SM
1062 if (is_state $ops[$i]) {
1063 $expr = $self->deparse($ops[$i], 0);
1064 $i++;
e99ebc55
RH
1065 if ($i > $#ops) {
1066 push @exprs, $expr;
1067 last;
1068 }
58cccf98 1069 }
c73811ab
RH
1070 if (!is_state $ops[$i] and (my $ls = $ops[$i+1]) and
1071 !null($ops[$i+1]) and $ops[$i+1]->name eq "lineseq")
58cccf98 1072 {
c73811ab
RH
1073 if ($ls->first && !null($ls->first) && is_state($ls->first)
1074 && (my $sib = $ls->first->sibling)) {
1075 if (!null($sib) && $sib->name eq "leaveloop") {
1076 push @exprs, $expr . $self->for_loop($ops[$i], 0);
1077 $i++;
1078 next;
1079 }
1080 }
6e90668e 1081 }
6ec152c3 1082 $expr .= $self->deparse($ops[$i], 0, (@ops != 1));
e99ebc55 1083 $expr =~ s/;\n?\z//;
f99a63a2 1084 push @exprs, $expr;
6e90668e 1085 }
ce4e655d
RH
1086 my $body = join(";\n", grep {length} @exprs);
1087 my $subs = "";
67fc2416 1088 if (defined $root && defined $limit_seq && !$self->{'in_format'}) {
ce4e655d
RH
1089 $subs = join "\n", $self->seq_subs($limit_seq);
1090 }
1091 return join(";\n", grep {length} $body, $subs);
6e90668e
SM
1092}
1093
58cccf98 1094sub scopeop {
ce4e655d 1095 my($real_block, $self, $op, $cx, $flags) = @_;
58cccf98
SM
1096 my $kid;
1097 my @kids;
a0405c92
RH
1098
1099 local(@$self{qw'curstash warnings hints'})
1100 = @$self{qw'curstash warnings hints'} if $real_block;
58cccf98
SM
1101 if ($real_block) {
1102 $kid = $op->first->sibling; # skip enter
1103 if (is_miniwhile($kid)) {
1104 my $top = $kid->first;
1105 my $name = $top->name;
1106 if ($name eq "and") {
1107 $name = "while";
1108 } elsif ($name eq "or") {
1109 $name = "until";
1110 } else { # no conditional -> while 1 or until 0
1111 return $self->deparse($top->first, 1) . " while 1";
1112 }
1113 my $cond = $top->first;
1114 my $body = $cond->sibling->first; # skip lineseq
1115 $cond = $self->deparse($cond, 1);
1116 $body = $self->deparse($body, 1);
1117 return "$body $name $cond";
6e90668e 1118 }
58cccf98
SM
1119 } else {
1120 $kid = $op->first;
1121 }
1122 for (; !null($kid); $kid = $kid->sibling) {
1123 push @kids, $kid;
6e90668e 1124 }
ce4e655d
RH
1125 if ($flags || $cx > 0) { # inside an expression, (a do {} while for lineseq)
1126 return "do {\n\t" . $self->lineseq($op, @kids) . "\n\b}";
9d2c6865 1127 } else {
ce4e655d 1128 my $lineseq = $self->lineseq($op, @kids);
7a9b44b9 1129 return (length ($lineseq) ? "$lineseq;" : "");
6e90668e 1130 }
6e90668e
SM
1131}
1132
ce4e655d 1133sub pp_scope { scopeop(0, @_); }
58cccf98
SM
1134sub pp_lineseq { scopeop(0, @_); }
1135sub pp_leave { scopeop(1, @_); }
9d2c6865 1136
6e90668e
SM
1137# The BEGIN {} is used here because otherwise this code isn't executed
1138# when you run B::Deparse on itself.
1139my %globalnames;
1140BEGIN { map($globalnames{$_}++, "SIG", "STDIN", "STDOUT", "STDERR", "INC",
1141 "ENV", "ARGV", "ARGVOUT", "_"); }
1142
1143sub gv_name {
1144 my $self = shift;
1145 my $gv = shift;
34a48b4b 1146Carp::confess() if $gv->isa("B::CV");
6e90668e 1147 my $stash = $gv->STASH->NAME;
d9963e60 1148 my $name = $gv->SAFENAME;
9d2c6865
SM
1149 if ($stash eq $self->{'curstash'} or $globalnames{$name}
1150 or $name =~ /^[^A-Za-z_]/)
1151 {
6e90668e
SM
1152 $stash = "";
1153 } else {
1154 $stash = $stash . "::";
a798dbf2 1155 }
083bda02
MS
1156 if ($name =~ /^(\^..|{)/) {
1157 $name = "{$name}"; # ${^WARNING_BITS}, etc and ${
6e90668e
SM
1158 }
1159 return $stash . $name;
a798dbf2
MB
1160}
1161
8510e997
RH
1162# Return the name to use for a stash variable.
1163# If a lexical with the same name is in scope, it may need to be
1164# fully-qualified.
1165sub stash_variable {
1166 my ($self, $prefix, $name) = @_;
1167
1168 return "$prefix$name" if $name =~ /::/;
1169
1170 unless ($prefix eq '$' || $prefix eq '@' ||
1171 $prefix eq '%' || $prefix eq '$#') {
1172 return "$prefix$name";
1173 }
1174
1175 my $v = ($prefix eq '$#' ? '@' : $prefix) . $name;
1176 return $prefix .$self->{'curstash'}.'::'. $name if $self->lex_in_scope($v);
1177 return "$prefix$name";
1178}
1179
1180sub lex_in_scope {
1181 my ($self, $name) = @_;
1182 $self->populate_curcvlex() if !defined $self->{'curcvlex'};
1183
6ec152c3 1184 return 0 if !defined($self->{'curcop'});
8510e997
RH
1185 my $seq = $self->{'curcop'}->cop_seq;
1186 return 0 if !exists $self->{'curcvlex'}{$name};
1187 for my $a (@{$self->{'curcvlex'}{$name}}) {
1188 my ($st, $en) = @$a;
1189 return 1 if $seq > $st && $seq <= $en;
1190 }
1191 return 0;
1192}
1193
1194sub populate_curcvlex {
1195 my $self = shift;
ce4e655d 1196 for (my $cv = $self->{'curcv'}; class($cv) eq "CV"; $cv = $cv->OUTSIDE) {
8510e997
RH
1197 my @padlist = $cv->PADLIST->ARRAY;
1198 my @ns = $padlist[0]->ARRAY;
1199
1200 for (my $i=0; $i<@ns; ++$i) {
1201 next if class($ns[$i]) eq "SPECIAL";
ce4e655d 1202 next if $ns[$i]->FLAGS & SVpad_OUR; # Skip "our" vars
0f2fe21d
RH
1203 if (class($ns[$i]) eq "PV") {
1204 # Probably that pesky lexical @_
1205 next;
1206 }
8510e997
RH
1207 my $name = $ns[$i]->PVX;
1208 my $seq_st = $ns[$i]->NVX;
1209 my $seq_en = int($ns[$i]->IVX);
1210
1211 push @{$self->{'curcvlex'}{$name}}, [$seq_st, $seq_en];
1212 }
1213 }
1214}
1215
ce4e655d
RH
1216sub find_scope_st { ((find_scope(@_))[0]); }
1217sub find_scope_en { ((find_scope(@_))[1]); }
1218
1219# Recurses down the tree, looking for pad variable introductions and COPs
1220sub find_scope {
1221 my ($self, $op, $scope_st, $scope_en) = @_;
1222Carp::cluck() if !defined $op;
1223 return ($scope_st, $scope_en) unless $op->flags & OPf_KIDS;
1224
1225 for (my $o=$op->first; $$o; $o=$o->sibling) {
1226 if ($o->name =~ /^pad.v$/ && $o->private & OPpLVAL_INTRO) {
1227 my $s = int($self->padname_sv($o->targ)->NVX);
1228 my $e = $self->padname_sv($o->targ)->IVX;
1229 $scope_st = $s if !defined($scope_st) || $s < $scope_st;
1230 $scope_en = $e if !defined($scope_en) || $e > $scope_en;
1231 }
1232 elsif (is_state($o)) {
1233 my $c = $o->cop_seq;
1234 $scope_st = $c if !defined($scope_st) || $c < $scope_st;
1235 $scope_en = $c if !defined($scope_en) || $c > $scope_en;
1236 }
1237 elsif ($o->flags & OPf_KIDS) {
1238 ($scope_st, $scope_en) =
1239 $self->find_scope($o, $scope_st, $scope_en)
34a48b4b
RH
1240 }
1241 }
ce4e655d
RH
1242
1243 return ($scope_st, $scope_en);
34a48b4b
RH
1244}
1245
1246# Returns a list of subs which should be inserted before the COP
1247sub cop_subs {
1248 my ($self, $op, $out_seq) = @_;
1249 my $seq = $op->cop_seq;
1250 # If we have nephews, then our sequence number indicates
1251 # the cop_seq of the end of some sort of scope.
1252 if (class($op->sibling) ne "NULL" && $op->sibling->flags & OPf_KIDS
ce4e655d
RH
1253 and my $nseq = $self->find_scope_st($op->sibling) ) {
1254 $seq = $nseq;
34a48b4b
RH
1255 }
1256 $seq = $out_seq if defined($out_seq) && $out_seq < $seq;
1257 return $self->seq_subs($seq);
1258}
1259
1260sub seq_subs {
1261 my ($self, $seq) = @_;
1262 my @text;
1263#push @text, "# ($seq)\n";
1264
ce4e655d 1265 return "" if !defined $seq;
34a48b4b
RH
1266 while (scalar(@{$self->{'subs_todo'}})
1267 and $seq > $self->{'subs_todo'}[0][0]) {
1268 push @text, $self->next_todo;
1269 }
1270 return @text;
1271}
1272
08c6f5ec 1273# Notice how subs and formats are inserted between statements here;
a0405c92 1274# also $[ assignments and pragmas.
6e90668e
SM
1275sub pp_nextstate {
1276 my $self = shift;
9d2c6865 1277 my($op, $cx) = @_;
34a48b4b 1278 $self->{'curcop'} = $op;
6e90668e 1279 my @text;
34a48b4b 1280 push @text, $self->cop_subs($op);
e99ebc55 1281 push @text, $op->label . ": " if $op->label;
11faa288 1282 my $stash = $op->stashpv;
6e90668e
SM
1283 if ($stash ne $self->{'curstash'}) {
1284 push @text, "package $stash;\n";
1285 $self->{'curstash'} = $stash;
1286 }
f5aa8f4e
SM
1287 if ($self->{'linenums'}) {
1288 push @text, "\f#line " . $op->line .
57843af0 1289 ' "' . $op->file, qq'"\n';
f5aa8f4e 1290 }
08c6f5ec 1291
7a9b44b9
RH
1292 if ($self->{'arybase'} != $op->arybase) {
1293 push @text, '$[ = '. $op->arybase .";\n";
1294 $self->{'arybase'} = $op->arybase;
1295 }
1296
1297 my $warnings = $op->warnings;
1298 my $warning_bits;
1299 if ($warnings->isa("B::SPECIAL") && $$warnings == 4) {
810aef70 1300 $warning_bits = $warnings::Bits{"all"} & WARN_MASK;
7a9b44b9 1301 }
e31885a0 1302 elsif ($warnings->isa("B::SPECIAL") && $$warnings == 5) {
810aef70 1303 $warning_bits = $warnings::NONE;
7a9b44b9 1304 }
e31885a0
RH
1305 elsif ($warnings->isa("B::SPECIAL")) {
1306 $warning_bits = undef;
1307 }
7a9b44b9 1308 else {
34a48b4b 1309 $warning_bits = $warnings->PV & WARN_MASK;
7a9b44b9
RH
1310 }
1311
e31885a0
RH
1312 if (defined ($warning_bits) and
1313 !defined($self->{warnings}) || $self->{'warnings'} ne $warning_bits) {
08c6f5ec 1314 push @text, declare_warnings($self->{'warnings'}, $warning_bits);
7a9b44b9
RH
1315 $self->{'warnings'} = $warning_bits;
1316 }
1317
a0405c92
RH
1318 if ($self->{'hints'} != $op->private) {
1319 push @text, declare_hints($self->{'hints'}, $op->private);
1320 $self->{'hints'} = $op->private;
1321 }
1322
6e90668e
SM
1323 return join("", @text);
1324}
1325
08c6f5ec
RH
1326sub declare_warnings {
1327 my ($from, $to) = @_;
6ec152c3 1328 if (($to & WARN_MASK) eq warnings::bits("all")) {
a0405c92
RH
1329 return "use warnings;\n";
1330 }
6ec152c3 1331 elsif (($to & WARN_MASK) eq "\0"x length($to)) {
a0405c92
RH
1332 return "no warnings;\n";
1333 }
1334 return "BEGIN {\${^WARNING_BITS} = ".cstring($to)."}\n";
1335}
1336
1337sub declare_hints {
1338 my ($from, $to) = @_;
a0035eb8
RH
1339 my $use = $to & ~$from;
1340 my $no = $from & ~$to;
1341 my $decls = "";
1342 for my $pragma (hint_pragmas($use)) {
1343 $decls .= "use $pragma;\n";
1344 }
1345 for my $pragma (hint_pragmas($no)) {
1346 $decls .= "no $pragma;\n";
1347 }
1348 return $decls;
1349}
1350
1351sub hint_pragmas {
1352 my ($bits) = @_;
1353 my @pragmas;
1354 push @pragmas, "integer" if $bits & 0x1;
1355 push @pragmas, "strict 'refs'" if $bits & 0x2;
1356 push @pragmas, "bytes" if $bits & 0x8;
1357 return @pragmas;
08c6f5ec
RH
1358}
1359
6e90668e 1360sub pp_dbstate { pp_nextstate(@_) }
3f872cb9 1361sub pp_setstate { pp_nextstate(@_) }
6e90668e
SM
1362
1363sub pp_unstack { return "" } # see also leaveloop
1364
1365sub baseop {
1366 my $self = shift;
9d2c6865 1367 my($op, $cx, $name) = @_;
6e90668e
SM
1368 return $name;
1369}
1370
e99ebc55
RH
1371sub pp_stub {
1372 my $self = shift;
1373 my($op, $cx, $name) = @_;
1374 if ($cx) {
1375 return "()";
1376 }
1377 else {
1378 return "();";
1379 }
1380}
6e90668e
SM
1381sub pp_wantarray { baseop(@_, "wantarray") }
1382sub pp_fork { baseop(@_, "fork") }
3ed82cfc
GS
1383sub pp_wait { maybe_targmy(@_, \&baseop, "wait") }
1384sub pp_getppid { maybe_targmy(@_, \&baseop, "getppid") }
1385sub pp_time { maybe_targmy(@_, \&baseop, "time") }
6e90668e
SM
1386sub pp_tms { baseop(@_, "times") }
1387sub pp_ghostent { baseop(@_, "gethostent") }
1388sub pp_gnetent { baseop(@_, "getnetent") }
1389sub pp_gprotoent { baseop(@_, "getprotoent") }
1390sub pp_gservent { baseop(@_, "getservent") }
1391sub pp_ehostent { baseop(@_, "endhostent") }
1392sub pp_enetent { baseop(@_, "endnetent") }
1393sub pp_eprotoent { baseop(@_, "endprotoent") }
1394sub pp_eservent { baseop(@_, "endservent") }
1395sub pp_gpwent { baseop(@_, "getpwent") }
1396sub pp_spwent { baseop(@_, "setpwent") }
1397sub pp_epwent { baseop(@_, "endpwent") }
1398sub pp_ggrent { baseop(@_, "getgrent") }
1399sub pp_sgrent { baseop(@_, "setgrent") }
1400sub pp_egrent { baseop(@_, "endgrent") }
1401sub pp_getlogin { baseop(@_, "getlogin") }
1402
1403sub POSTFIX () { 1 }
1404
9d2c6865
SM
1405# I couldn't think of a good short name, but this is the category of
1406# symbolic unary operators with interesting precedence
1407
1408sub pfixop {
1409 my $self = shift;
1410 my($op, $cx, $name, $prec, $flags) = (@_, 0);
1411 my $kid = $op->first;
1412 $kid = $self->deparse($kid, $prec);
1413 return $self->maybe_parens(($flags & POSTFIX) ? "$kid$name" : "$name$kid",
1414 $cx, $prec);
1415}
1416
1417sub pp_preinc { pfixop(@_, "++", 23) }
1418sub pp_predec { pfixop(@_, "--", 23) }
3ed82cfc
GS
1419sub pp_postinc { maybe_targmy(@_, \&pfixop, "++", 23, POSTFIX) }
1420sub pp_postdec { maybe_targmy(@_, \&pfixop, "--", 23, POSTFIX) }
9d2c6865
SM
1421sub pp_i_preinc { pfixop(@_, "++", 23) }
1422sub pp_i_predec { pfixop(@_, "--", 23) }
3ed82cfc
GS
1423sub pp_i_postinc { maybe_targmy(@_, \&pfixop, "++", 23, POSTFIX) }
1424sub pp_i_postdec { maybe_targmy(@_, \&pfixop, "--", 23, POSTFIX) }
68cc8748 1425sub pp_complement { maybe_targmy(@_, \&pfixop, "~", 21) }
9d2c6865 1426
3ed82cfc
GS
1427sub pp_negate { maybe_targmy(@_, \&real_negate) }
1428sub real_negate {
9d2c6865
SM
1429 my $self = shift;
1430 my($op, $cx) = @_;
3f872cb9 1431 if ($op->first->name =~ /^(i_)?negate$/) {
9d2c6865
SM
1432 # avoid --$x
1433 $self->pfixop($op, $cx, "-", 21.5);
1434 } else {
1435 $self->pfixop($op, $cx, "-", 21);
1436 }
1437}
1438sub pp_i_negate { pp_negate(@_) }
1439
1440sub pp_not {
1441 my $self = shift;
1442 my($op, $cx) = @_;
1443 if ($cx <= 4) {
1444 $self->pfixop($op, $cx, "not ", 4);
1445 } else {
1446 $self->pfixop($op, $cx, "!", 21);
1447 }
1448}
1449
6e90668e
SM
1450sub unop {
1451 my $self = shift;
f4a44678 1452 my($op, $cx, $name) = @_;
6e90668e 1453 my $kid;
9d2c6865 1454 if ($op->flags & OPf_KIDS) {
6e90668e 1455 $kid = $op->first;
e31885a0
RH
1456 if (defined prototype("CORE::$name")
1457 && prototype("CORE::$name") =~ /^;?\*/
1458 && $kid->name eq "rv2gv") {
1459 $kid = $kid->first;
1460 }
1461
9d2c6865 1462 return $self->maybe_parens_unop($name, $kid, $cx);
6e90668e 1463 } else {
9d2c6865 1464 return $name . ($op->flags & OPf_SPECIAL ? "()" : "");
6e90668e 1465 }
6e90668e
SM
1466}
1467
3ed82cfc
GS
1468sub pp_chop { maybe_targmy(@_, \&unop, "chop") }
1469sub pp_chomp { maybe_targmy(@_, \&unop, "chomp") }
1470sub pp_schop { maybe_targmy(@_, \&unop, "chop") }
1471sub pp_schomp { maybe_targmy(@_, \&unop, "chomp") }
6e90668e
SM
1472sub pp_defined { unop(@_, "defined") }
1473sub pp_undef { unop(@_, "undef") }
1474sub pp_study { unop(@_, "study") }
6e90668e
SM
1475sub pp_ref { unop(@_, "ref") }
1476sub pp_pos { maybe_local(@_, unop(@_, "pos")) }
1477
3ed82cfc
GS
1478sub pp_sin { maybe_targmy(@_, \&unop, "sin") }
1479sub pp_cos { maybe_targmy(@_, \&unop, "cos") }
1480sub pp_rand { maybe_targmy(@_, \&unop, "rand") }
6e90668e 1481sub pp_srand { unop(@_, "srand") }
3ed82cfc
GS
1482sub pp_exp { maybe_targmy(@_, \&unop, "exp") }
1483sub pp_log { maybe_targmy(@_, \&unop, "log") }
1484sub pp_sqrt { maybe_targmy(@_, \&unop, "sqrt") }
1485sub pp_int { maybe_targmy(@_, \&unop, "int") }
1486sub pp_hex { maybe_targmy(@_, \&unop, "hex") }
1487sub pp_oct { maybe_targmy(@_, \&unop, "oct") }
1488sub pp_abs { maybe_targmy(@_, \&unop, "abs") }
1489
1490sub pp_length { maybe_targmy(@_, \&unop, "length") }
1491sub pp_ord { maybe_targmy(@_, \&unop, "ord") }
1492sub pp_chr { maybe_targmy(@_, \&unop, "chr") }
6e90668e
SM
1493
1494sub pp_each { unop(@_, "each") }
1495sub pp_values { unop(@_, "values") }
1496sub pp_keys { unop(@_, "keys") }
1497sub pp_pop { unop(@_, "pop") }
1498sub pp_shift { unop(@_, "shift") }
1499
1500sub pp_caller { unop(@_, "caller") }
1501sub pp_reset { unop(@_, "reset") }
1502sub pp_exit { unop(@_, "exit") }
1503sub pp_prototype { unop(@_, "prototype") }
1504
1505sub pp_close { unop(@_, "close") }
1506sub pp_fileno { unop(@_, "fileno") }
1507sub pp_umask { unop(@_, "umask") }
6e90668e
SM
1508sub pp_untie { unop(@_, "untie") }
1509sub pp_tied { unop(@_, "tied") }
1510sub pp_dbmclose { unop(@_, "dbmclose") }
1511sub pp_getc { unop(@_, "getc") }
1512sub pp_eof { unop(@_, "eof") }
1513sub pp_tell { unop(@_, "tell") }
1514sub pp_getsockname { unop(@_, "getsockname") }
1515sub pp_getpeername { unop(@_, "getpeername") }
1516
3ed82cfc
GS
1517sub pp_chdir { maybe_targmy(@_, \&unop, "chdir") }
1518sub pp_chroot { maybe_targmy(@_, \&unop, "chroot") }
6e90668e 1519sub pp_readlink { unop(@_, "readlink") }
3ed82cfc 1520sub pp_rmdir { maybe_targmy(@_, \&unop, "rmdir") }
6e90668e
SM
1521sub pp_readdir { unop(@_, "readdir") }
1522sub pp_telldir { unop(@_, "telldir") }
1523sub pp_rewinddir { unop(@_, "rewinddir") }
1524sub pp_closedir { unop(@_, "closedir") }
3ed82cfc 1525sub pp_getpgrp { maybe_targmy(@_, \&unop, "getpgrp") }
6e90668e
SM
1526sub pp_localtime { unop(@_, "localtime") }
1527sub pp_gmtime { unop(@_, "gmtime") }
1528sub pp_alarm { unop(@_, "alarm") }
3ed82cfc 1529sub pp_sleep { maybe_targmy(@_, \&unop, "sleep") }
6e90668e
SM
1530
1531sub pp_dofile { unop(@_, "do") }
1532sub pp_entereval { unop(@_, "eval") }
1533
1534sub pp_ghbyname { unop(@_, "gethostbyname") }
1535sub pp_gnbyname { unop(@_, "getnetbyname") }
1536sub pp_gpbyname { unop(@_, "getprotobyname") }
1537sub pp_shostent { unop(@_, "sethostent") }
1538sub pp_snetent { unop(@_, "setnetent") }
1539sub pp_sprotoent { unop(@_, "setprotoent") }
1540sub pp_sservent { unop(@_, "setservent") }
1541sub pp_gpwnam { unop(@_, "getpwnam") }
1542sub pp_gpwuid { unop(@_, "getpwuid") }
1543sub pp_ggrnam { unop(@_, "getgrnam") }
1544sub pp_ggrgid { unop(@_, "getgrgid") }
1545
1546sub pp_lock { unop(@_, "lock") }
1547
1548sub pp_exists {
1549 my $self = shift;
9d2c6865 1550 my($op, $cx) = @_;
34a48b4b
RH
1551 my $arg;
1552 if ($op->private & OPpEXISTS_SUB) {
1553 # Checking for the existence of a subroutine
1554 return $self->maybe_parens_func("exists",
1555 $self->pp_rv2cv($op->first, 16), $cx, 16);
1556 }
1557 if ($op->flags & OPf_SPECIAL) {
1558 # Array element, not hash element
1559 return $self->maybe_parens_func("exists",
1560 $self->pp_aelem($op->first, 16), $cx, 16);
1561 }
9d2c6865
SM
1562 return $self->maybe_parens_func("exists", $self->pp_helem($op->first, 16),
1563 $cx, 16);
6e90668e
SM
1564}
1565
6e90668e
SM
1566sub pp_delete {
1567 my $self = shift;
9d2c6865 1568 my($op, $cx) = @_;
6e90668e
SM
1569 my $arg;
1570 if ($op->private & OPpSLICE) {
34a48b4b
RH
1571 if ($op->flags & OPf_SPECIAL) {
1572 # Deleting from an array, not a hash
1573 return $self->maybe_parens_func("delete",
1574 $self->pp_aslice($op->first, 16),
1575 $cx, 16);
1576 }
9d2c6865
SM
1577 return $self->maybe_parens_func("delete",
1578 $self->pp_hslice($op->first, 16),
1579 $cx, 16);
6e90668e 1580 } else {
34a48b4b
RH
1581 if ($op->flags & OPf_SPECIAL) {
1582 # Deleting from an array, not a hash
1583 return $self->maybe_parens_func("delete",
1584 $self->pp_aelem($op->first, 16),
1585 $cx, 16);
1586 }
9d2c6865
SM
1587 return $self->maybe_parens_func("delete",
1588 $self->pp_helem($op->first, 16),
1589 $cx, 16);
6e90668e 1590 }
6e90668e
SM
1591}
1592
6e90668e
SM
1593sub pp_require {
1594 my $self = shift;
9d2c6865 1595 my($op, $cx) = @_;
3f872cb9 1596 if (class($op) eq "UNOP" and $op->first->name eq "const"
4c1f658f 1597 and $op->first->private & OPpCONST_BARE)
6e90668e 1598 {
18228111 1599 my $name = $self->const_sv($op->first)->PV;
6e90668e
SM
1600 $name =~ s[/][::]g;
1601 $name =~ s/\.pm//g;
34a48b4b 1602 return "require $name";
6e90668e 1603 } else {
9d2c6865 1604 $self->unop($op, $cx, "require");
6e90668e
SM
1605 }
1606}
1607
9d2c6865
SM
1608sub pp_scalar {
1609 my $self = shift;
1610 my($op, $cv) = @_;
1611 my $kid = $op->first;
1612 if (not null $kid->sibling) {
1613 # XXX Was a here-doc
1614 return $self->dquote($op);
1615 }
1616 $self->unop(@_, "scalar");
1617}
1618
1619
6e90668e
SM
1620sub padval {
1621 my $self = shift;
1622 my $targ = shift;
18228111 1623 #cluck "curcv was undef" unless $self->{curcv};
6e90668e
SM
1624 return (($self->{'curcv'}->PADLIST->ARRAY)[1]->ARRAY)[$targ];
1625}
1626
1627sub pp_refgen {
1628 my $self = shift;
9d2c6865 1629 my($op, $cx) = @_;
6e90668e 1630 my $kid = $op->first;
3f872cb9 1631 if ($kid->name eq "null") {
6e90668e 1632 $kid = $kid->first;
3f872cb9
GS
1633 if ($kid->name eq "anonlist" || $kid->name eq "anonhash") {
1634 my($pre, $post) = @{{"anonlist" => ["[","]"],
1635 "anonhash" => ["{","}"]}->{$kid->name}};
6e90668e
SM
1636 my($expr, @exprs);
1637 $kid = $kid->first->sibling; # skip pushmark
1638 for (; !null($kid); $kid = $kid->sibling) {
9d2c6865 1639 $expr = $self->deparse($kid, 6);
6e90668e
SM
1640 push @exprs, $expr;
1641 }
1642 return $pre . join(", ", @exprs) . $post;
1643 } elsif (!null($kid->sibling) and
3f872cb9 1644 $kid->sibling->name eq "anoncode") {
6e90668e
SM
1645 return "sub " .
1646 $self->deparse_sub($self->padval($kid->sibling->targ));
3f872cb9
GS
1647 } elsif ($kid->name eq "pushmark") {
1648 my $sib_name = $kid->sibling->name;
1649 if ($sib_name =~ /^(pad|rv2)[ah]v$/
c8c62db7
AD
1650 and not $kid->sibling->flags & OPf_REF)
1651 {
1652 # The @a in \(@a) isn't in ref context, but only when the
1653 # parens are there.
1654 return "\\(" . $self->deparse($kid->sibling, 1) . ")";
3f872cb9 1655 } elsif ($sib_name eq 'entersub') {
c8c62db7
AD
1656 my $text = $self->deparse($kid->sibling, 1);
1657 # Always show parens for \(&func()), but only with -p otherwise
1658 $text = "($text)" if $self->{'parens'}
1659 or $kid->sibling->private & OPpENTERSUB_AMPER;
1660 return "\\$text";
1661 }
1662 }
6e90668e 1663 }
9d2c6865 1664 $self->pfixop($op, $cx, "\\", 20);
6e90668e
SM
1665}
1666
1667sub pp_srefgen { pp_refgen(@_) }
1668
1669sub pp_readline {
1670 my $self = shift;
9d2c6865 1671 my($op, $cx) = @_;
6e90668e 1672 my $kid = $op->first;
3f872cb9 1673 $kid = $kid->first if $kid->name eq "rv2gv"; # <$fh>
e31885a0
RH
1674 return "<" . $self->deparse($kid, 1) . ">" if is_scalar($kid);
1675 return $self->unop($op, $cx, "readline");
6e90668e
SM
1676}
1677
ad8caead
RGS
1678sub pp_rcatline {
1679 my $self = shift;
1680 my($op) = @_;
1681 return "<" . $self->gv_name($op->gv) . ">";
1682}
1683
bd0865ec
GS
1684# Unary operators that can occur as pseudo-listops inside double quotes
1685sub dq_unop {
1686 my $self = shift;
1687 my($op, $cx, $name, $prec, $flags) = (@_, 0, 0);
1688 my $kid;
1689 if ($op->flags & OPf_KIDS) {
1690 $kid = $op->first;
1691 # If there's more than one kid, the first is an ex-pushmark.
1692 $kid = $kid->sibling if not null $kid->sibling;
1693 return $self->maybe_parens_unop($name, $kid, $cx);
1694 } else {
1695 return $name . ($op->flags & OPf_SPECIAL ? "()" : "");
1696 }
1697}
1698
1699sub pp_ucfirst { dq_unop(@_, "ucfirst") }
1700sub pp_lcfirst { dq_unop(@_, "lcfirst") }
1701sub pp_uc { dq_unop(@_, "uc") }
1702sub pp_lc { dq_unop(@_, "lc") }
3ed82cfc 1703sub pp_quotemeta { maybe_targmy(@_, \&dq_unop, "quotemeta") }
bd0865ec 1704
6e90668e
SM
1705sub loopex {
1706 my $self = shift;
9d2c6865 1707 my ($op, $cx, $name) = @_;
6e90668e 1708 if (class($op) eq "PVOP") {
9d2c6865
SM
1709 return "$name " . $op->pv;
1710 } elsif (class($op) eq "OP") {
1711 return $name;
6e90668e 1712 } elsif (class($op) eq "UNOP") {
9d2c6865
SM
1713 # Note -- loop exits are actually exempt from the
1714 # looks-like-a-func rule, but a few extra parens won't hurt
1715 return $self->maybe_parens_unop($name, $op->first, $cx);
6e90668e 1716 }
6e90668e
SM
1717}
1718
1719sub pp_last { loopex(@_, "last") }
1720sub pp_next { loopex(@_, "next") }
1721sub pp_redo { loopex(@_, "redo") }
1722sub pp_goto { loopex(@_, "goto") }
1723sub pp_dump { loopex(@_, "dump") }
1724
1725sub ftst {
1726 my $self = shift;
9d2c6865 1727 my($op, $cx, $name) = @_;
6e90668e 1728 if (class($op) eq "UNOP") {
9d2c6865
SM
1729 # Genuine `-X' filetests are exempt from the LLAFR, but not
1730 # l?stat(); for the sake of clarity, give'em all parens
1731 return $self->maybe_parens_unop($name, $op->first, $cx);
7934575e 1732 } elsif (class($op) eq "SVOP") {
9d2c6865 1733 return $self->maybe_parens_func($name, $self->pp_gv($op, 1), $cx, 16);
6e90668e 1734 } else { # I don't think baseop filetests ever survive ck_ftst, but...
9d2c6865 1735 return $name;
6e90668e 1736 }
6e90668e
SM
1737}
1738
1739sub pp_lstat { ftst(@_, "lstat") }
1740sub pp_stat { ftst(@_, "stat") }
1741sub pp_ftrread { ftst(@_, "-R") }
1742sub pp_ftrwrite { ftst(@_, "-W") }
1743sub pp_ftrexec { ftst(@_, "-X") }
1744sub pp_fteread { ftst(@_, "-r") }
e31885a0
RH
1745sub pp_ftewrite { ftst(@_, "-w") }
1746sub pp_fteexec { ftst(@_, "-x") }
6e90668e
SM
1747sub pp_ftis { ftst(@_, "-e") }
1748sub pp_fteowned { ftst(@_, "-O") }
1749sub pp_ftrowned { ftst(@_, "-o") }
1750sub pp_ftzero { ftst(@_, "-z") }
1751sub pp_ftsize { ftst(@_, "-s") }
1752sub pp_ftmtime { ftst(@_, "-M") }
1753sub pp_ftatime { ftst(@_, "-A") }
1754sub pp_ftctime { ftst(@_, "-C") }
1755sub pp_ftsock { ftst(@_, "-S") }
1756sub pp_ftchr { ftst(@_, "-c") }
1757sub pp_ftblk { ftst(@_, "-b") }
1758sub pp_ftfile { ftst(@_, "-f") }
1759sub pp_ftdir { ftst(@_, "-d") }
1760sub pp_ftpipe { ftst(@_, "-p") }
1761sub pp_ftlink { ftst(@_, "-l") }
1762sub pp_ftsuid { ftst(@_, "-u") }
1763sub pp_ftsgid { ftst(@_, "-g") }
1764sub pp_ftsvtx { ftst(@_, "-k") }
1765sub pp_fttty { ftst(@_, "-t") }
1766sub pp_fttext { ftst(@_, "-T") }
1767sub pp_ftbinary { ftst(@_, "-B") }
1768
a798dbf2 1769sub SWAP_CHILDREN () { 1 }
6e90668e 1770sub ASSIGN () { 2 } # has OP= variant
7013e6ae 1771sub LIST_CONTEXT () { 4 } # Assignment is in list context
6e90668e 1772
9d2c6865
SM
1773my(%left, %right);
1774
1775sub assoc_class {
1776 my $op = shift;
3f872cb9
GS
1777 my $name = $op->name;
1778 if ($name eq "concat" and $op->first->name eq "concat") {
9d2c6865 1779 # avoid spurious `=' -- see comment in pp_concat
3f872cb9 1780 return "concat";
9d2c6865 1781 }
3f872cb9
GS
1782 if ($name eq "null" and class($op) eq "UNOP"
1783 and $op->first->name =~ /^(and|x?or)$/
9d2c6865
SM
1784 and null $op->first->sibling)
1785 {
1786 # Like all conditional constructs, OP_ANDs and OP_ORs are topped
1787 # with a null that's used as the common end point of the two
1788 # flows of control. For precedence purposes, ignore it.
1789 # (COND_EXPRs have these too, but we don't bother with
1790 # their associativity).
1791 return assoc_class($op->first);
1792 }
1793 return $name . ($op->flags & OPf_STACKED ? "=" : "");
1794}
1795
1796# Left associative operators, like `+', for which
1797# $a + $b + $c is equivalent to ($a + $b) + $c
1798
1799BEGIN {
3f872cb9
GS
1800 %left = ('multiply' => 19, 'i_multiply' => 19,
1801 'divide' => 19, 'i_divide' => 19,
1802 'modulo' => 19, 'i_modulo' => 19,
1803 'repeat' => 19,
1804 'add' => 18, 'i_add' => 18,
1805 'subtract' => 18, 'i_subtract' => 18,
1806 'concat' => 18,
1807 'left_shift' => 17, 'right_shift' => 17,
1808 'bit_and' => 13,
1809 'bit_or' => 12, 'bit_xor' => 12,
1810 'and' => 3,
1811 'or' => 2, 'xor' => 2,
9d2c6865
SM
1812 );
1813}
1814
1815sub deparse_binop_left {
1816 my $self = shift;
1817 my($op, $left, $prec) = @_;
58231d39 1818 if ($left{assoc_class($op)} && $left{assoc_class($left)}
9d2c6865
SM
1819 and $left{assoc_class($op)} == $left{assoc_class($left)})
1820 {
1821 return $self->deparse($left, $prec - .00001);
1822 } else {
1823 return $self->deparse($left, $prec);
1824 }
1825}
1826
1827# Right associative operators, like `=', for which
1828# $a = $b = $c is equivalent to $a = ($b = $c)
1829
1830BEGIN {
3f872cb9
GS
1831 %right = ('pow' => 22,
1832 'sassign=' => 7, 'aassign=' => 7,
1833 'multiply=' => 7, 'i_multiply=' => 7,
1834 'divide=' => 7, 'i_divide=' => 7,
1835 'modulo=' => 7, 'i_modulo=' => 7,
1836 'repeat=' => 7,
1837 'add=' => 7, 'i_add=' => 7,
1838 'subtract=' => 7, 'i_subtract=' => 7,
1839 'concat=' => 7,
1840 'left_shift=' => 7, 'right_shift=' => 7,
1841 'bit_and=' => 7,
1842 'bit_or=' => 7, 'bit_xor=' => 7,
1843 'andassign' => 7,
1844 'orassign' => 7,
9d2c6865
SM
1845 );
1846}
1847
1848sub deparse_binop_right {
1849 my $self = shift;
1850 my($op, $right, $prec) = @_;
58231d39 1851 if ($right{assoc_class($op)} && $right{assoc_class($right)}
9d2c6865
SM
1852 and $right{assoc_class($op)} == $right{assoc_class($right)})
1853 {
1854 return $self->deparse($right, $prec - .00001);
1855 } else {
1856 return $self->deparse($right, $prec);
1857 }
1858}
1859
a798dbf2 1860sub binop {
6e90668e 1861 my $self = shift;
9d2c6865 1862 my ($op, $cx, $opname, $prec, $flags) = (@_, 0);
a798dbf2
MB
1863 my $left = $op->first;
1864 my $right = $op->last;
9d2c6865
SM
1865 my $eq = "";
1866 if ($op->flags & OPf_STACKED && $flags & ASSIGN) {
1867 $eq = "=";
1868 $prec = 7;
1869 }
a798dbf2
MB
1870 if ($flags & SWAP_CHILDREN) {
1871 ($left, $right) = ($right, $left);
1872 }
9d2c6865 1873 $left = $self->deparse_binop_left($op, $left, $prec);
90c0eb26
RH
1874 $left = "($left)" if $flags & LIST_CONTEXT
1875 && $left !~ /^(my|our|local|)[\@\(]/;
9d2c6865
SM
1876 $right = $self->deparse_binop_right($op, $right, $prec);
1877 return $self->maybe_parens("$left $opname$eq $right", $cx, $prec);
1878}
1879
3ed82cfc
GS
1880sub pp_add { maybe_targmy(@_, \&binop, "+", 18, ASSIGN) }
1881sub pp_multiply { maybe_targmy(@_, \&binop, "*", 19, ASSIGN) }
1882sub pp_subtract { maybe_targmy(@_, \&binop, "-",18, ASSIGN) }
1883sub pp_divide { maybe_targmy(@_, \&binop, "/", 19, ASSIGN) }
1884sub pp_modulo { maybe_targmy(@_, \&binop, "%", 19, ASSIGN) }
1885sub pp_i_add { maybe_targmy(@_, \&binop, "+", 18, ASSIGN) }
1886sub pp_i_multiply { maybe_targmy(@_, \&binop, "*", 19, ASSIGN) }
1887sub pp_i_subtract { maybe_targmy(@_, \&binop, "-", 18, ASSIGN) }
1888sub pp_i_divide { maybe_targmy(@_, \&binop, "/", 19, ASSIGN) }
1889sub pp_i_modulo { maybe_targmy(@_, \&binop, "%", 19, ASSIGN) }
1890sub pp_pow { maybe_targmy(@_, \&binop, "**", 22, ASSIGN) }
1891
1892sub pp_left_shift { maybe_targmy(@_, \&binop, "<<", 17, ASSIGN) }
1893sub pp_right_shift { maybe_targmy(@_, \&binop, ">>", 17, ASSIGN) }
1894sub pp_bit_and { maybe_targmy(@_, \&binop, "&", 13, ASSIGN) }
1895sub pp_bit_or { maybe_targmy(@_, \&binop, "|", 12, ASSIGN) }
1896sub pp_bit_xor { maybe_targmy(@_, \&binop, "^", 12, ASSIGN) }
9d2c6865
SM
1897
1898sub pp_eq { binop(@_, "==", 14) }
1899sub pp_ne { binop(@_, "!=", 14) }
1900sub pp_lt { binop(@_, "<", 15) }
1901sub pp_gt { binop(@_, ">", 15) }
1902sub pp_ge { binop(@_, ">=", 15) }
1903sub pp_le { binop(@_, "<=", 15) }
1904sub pp_ncmp { binop(@_, "<=>", 14) }
1905sub pp_i_eq { binop(@_, "==", 14) }
1906sub pp_i_ne { binop(@_, "!=", 14) }
1907sub pp_i_lt { binop(@_, "<", 15) }
1908sub pp_i_gt { binop(@_, ">", 15) }
1909sub pp_i_ge { binop(@_, ">=", 15) }
1910sub pp_i_le { binop(@_, "<=", 15) }
1911sub pp_i_ncmp { binop(@_, "<=>", 14) }
1912
1913sub pp_seq { binop(@_, "eq", 14) }
1914sub pp_sne { binop(@_, "ne", 14) }
1915sub pp_slt { binop(@_, "lt", 15) }
1916sub pp_sgt { binop(@_, "gt", 15) }
1917sub pp_sge { binop(@_, "ge", 15) }
1918sub pp_sle { binop(@_, "le", 15) }
1919sub pp_scmp { binop(@_, "cmp", 14) }
1920
1921sub pp_sassign { binop(@_, "=", 7, SWAP_CHILDREN) }
7013e6ae 1922sub pp_aassign { binop(@_, "=", 7, SWAP_CHILDREN | LIST_CONTEXT) }
6e90668e
SM
1923
1924# `.' is special because concats-of-concats are optimized to save copying
1925# by making all but the first concat stacked. The effect is as if the
1926# programmer had written `($a . $b) .= $c', except legal.
3ed82cfc
GS
1927sub pp_concat { maybe_targmy(@_, \&real_concat) }
1928sub real_concat {
6e90668e 1929 my $self = shift;
9d2c6865 1930 my($op, $cx) = @_;
6e90668e
SM
1931 my $left = $op->first;
1932 my $right = $op->last;
1933 my $eq = "";
9d2c6865 1934 my $prec = 18;
3f872cb9 1935 if ($op->flags & OPf_STACKED and $op->first->name ne "concat") {
6e90668e 1936 $eq = "=";
9d2c6865 1937 $prec = 7;
6e90668e 1938 }
9d2c6865
SM
1939 $left = $self->deparse_binop_left($op, $left, $prec);
1940 $right = $self->deparse_binop_right($op, $right, $prec);
1941 return $self->maybe_parens("$left .$eq $right", $cx, $prec);
6e90668e
SM
1942}
1943
1944# `x' is weird when the left arg is a list
1945sub pp_repeat {
1946 my $self = shift;
9d2c6865 1947 my($op, $cx) = @_;
6e90668e
SM
1948 my $left = $op->first;
1949 my $right = $op->last;
9d2c6865
SM
1950 my $eq = "";
1951 my $prec = 19;
1952 if ($op->flags & OPf_STACKED) {
1953 $eq = "=";
1954 $prec = 7;
1955 }
6e90668e
SM
1956 if (null($right)) { # list repeat; count is inside left-side ex-list
1957 my $kid = $left->first->sibling; # skip pushmark
1958 my @exprs;
1959 for (; !null($kid->sibling); $kid = $kid->sibling) {
9d2c6865 1960 push @exprs, $self->deparse($kid, 6);
6e90668e
SM
1961 }
1962 $right = $kid;
1963 $left = "(" . join(", ", @exprs). ")";
1964 } else {
9d2c6865 1965 $left = $self->deparse_binop_left($op, $left, $prec);
6e90668e 1966 }
9d2c6865
SM
1967 $right = $self->deparse_binop_right($op, $right, $prec);
1968 return $self->maybe_parens("$left x$eq $right", $cx, $prec);
6e90668e
SM
1969}
1970
1971sub range {
1972 my $self = shift;
9d2c6865 1973 my ($op, $cx, $type) = @_;
6e90668e
SM
1974 my $left = $op->first;
1975 my $right = $left->sibling;
9d2c6865
SM
1976 $left = $self->deparse($left, 9);
1977 $right = $self->deparse($right, 9);
1978 return $self->maybe_parens("$left $type $right", $cx, 9);
6e90668e
SM
1979}
1980
1981sub pp_flop {
1982 my $self = shift;
9d2c6865 1983 my($op, $cx) = @_;
6e90668e
SM
1984 my $flip = $op->first;
1985 my $type = ($flip->flags & OPf_SPECIAL) ? "..." : "..";
9d2c6865 1986 return $self->range($flip->first, $cx, $type);
6e90668e
SM
1987}
1988
1989# one-line while/until is handled in pp_leave
1990
1991sub logop {
1992 my $self = shift;
9d2c6865 1993 my ($op, $cx, $lowop, $lowprec, $highop, $highprec, $blockname) = @_;
6e90668e
SM
1994 my $left = $op->first;
1995 my $right = $op->first->sibling;
58cccf98
SM
1996 if ($cx == 0 and is_scope($right) and $blockname
1997 and $self->{'expand'} < 7)
1998 { # if ($a) {$b}
9d2c6865
SM
1999 $left = $self->deparse($left, 1);
2000 $right = $self->deparse($right, 0);
2001 return "$blockname ($left) {\n\t$right\n\b}\cK";
58cccf98
SM
2002 } elsif ($cx == 0 and $blockname and not $self->{'parens'}
2003 and $self->{'expand'} < 7) { # $b if $a
9d2c6865
SM
2004 $right = $self->deparse($right, 1);
2005 $left = $self->deparse($left, 1);
2006 return "$right $blockname $left";
2007 } elsif ($cx > $lowprec and $highop) { # $a && $b
2008 $left = $self->deparse_binop_left($op, $left, $highprec);
2009 $right = $self->deparse_binop_right($op, $right, $highprec);
2010 return $self->maybe_parens("$left $highop $right", $cx, $highprec);
2011 } else { # $a and $b
2012 $left = $self->deparse_binop_left($op, $left, $lowprec);
2013 $right = $self->deparse_binop_right($op, $right, $lowprec);
2014 return $self->maybe_parens("$left $lowop $right", $cx, $lowprec);
2015 }
2016}
2017
2018sub pp_and { logop(@_, "and", 3, "&&", 11, "if") }
f4a44678 2019sub pp_or { logop(@_, "or", 2, "||", 10, "unless") }
3ed82cfc
GS
2020
2021# xor is syntactically a logop, but it's really a binop (contrary to
2022# old versions of opcode.pl). Syntax is what matters here.
9d2c6865 2023sub pp_xor { logop(@_, "xor", 2, "", 0, "") }
6e90668e
SM
2024
2025sub logassignop {
2026 my $self = shift;
9d2c6865 2027 my ($op, $cx, $opname) = @_;
6e90668e
SM
2028 my $left = $op->first;
2029 my $right = $op->first->sibling->first; # skip sassign
9d2c6865
SM
2030 $left = $self->deparse($left, 7);
2031 $right = $self->deparse($right, 7);
2032 return $self->maybe_parens("$left $opname $right", $cx, 7);
a798dbf2
MB
2033}
2034
6e90668e
SM
2035sub pp_andassign { logassignop(@_, "&&=") }
2036sub pp_orassign { logassignop(@_, "||=") }
2037
2038sub listop {
2039 my $self = shift;
9d2c6865
SM
2040 my($op, $cx, $name) = @_;
2041 my(@exprs);
2042 my $parens = ($cx >= 5) || $self->{'parens'};
2043 my $kid = $op->first->sibling;
2044 return $name if null $kid;
e31885a0
RH
2045 my $first;
2046 if (defined prototype("CORE::$name")
2047 && prototype("CORE::$name") =~ /^;?\*/
2048 && $kid->name eq "rv2gv") {
2049 $first = $self->deparse($kid->first, 6);
2050 }
2051 else {
2052 $first = $self->deparse($kid, 6);
2053 }
e99ebc55 2054 if ($name eq "chmod" && $first =~ /^\d+$/) {
a0035eb8 2055 $first = sprintf("%#o", $first);
e99ebc55 2056 }
9d2c6865
SM
2057 $first = "+$first" if not $parens and substr($first, 0, 1) eq "(";
2058 push @exprs, $first;
2059 $kid = $kid->sibling;
2060 for (; !null($kid); $kid = $kid->sibling) {
2061 push @exprs, $self->deparse($kid, 6);
2062 }
2063 if ($parens) {
2064 return "$name(" . join(", ", @exprs) . ")";
2065 } else {
2066 return "$name " . join(", ", @exprs);
6e90668e 2067 }
6e90668e 2068}
a798dbf2 2069
6e90668e 2070sub pp_bless { listop(@_, "bless") }
3ed82cfc 2071sub pp_atan2 { maybe_targmy(@_, \&listop, "atan2") }
6e90668e
SM
2072sub pp_substr { maybe_local(@_, listop(@_, "substr")) }
2073sub pp_vec { maybe_local(@_, listop(@_, "vec")) }
3ed82cfc
GS
2074sub pp_index { maybe_targmy(@_, \&listop, "index") }
2075sub pp_rindex { maybe_targmy(@_, \&listop, "rindex") }
2076sub pp_sprintf { maybe_targmy(@_, \&listop, "sprintf") }
6e90668e 2077sub pp_formline { listop(@_, "formline") } # see also deparse_format
3ed82cfc 2078sub pp_crypt { maybe_targmy(@_, \&listop, "crypt") }
6e90668e
SM
2079sub pp_unpack { listop(@_, "unpack") }
2080sub pp_pack { listop(@_, "pack") }
3ed82cfc 2081sub pp_join { maybe_targmy(@_, \&listop, "join") }
6e90668e 2082sub pp_splice { listop(@_, "splice") }
3ed82cfc
GS
2083sub pp_push { maybe_targmy(@_, \&listop, "push") }
2084sub pp_unshift { maybe_targmy(@_, \&listop, "unshift") }
6e90668e
SM
2085sub pp_reverse { listop(@_, "reverse") }
2086sub pp_warn { listop(@_, "warn") }
2087sub pp_die { listop(@_, "die") }
9d2c6865
SM
2088# Actually, return is exempt from the LLAFR (see examples in this very
2089# module!), but for consistency's sake, ignore that fact
6e90668e
SM
2090sub pp_return { listop(@_, "return") }
2091sub pp_open { listop(@_, "open") }
2092sub pp_pipe_op { listop(@_, "pipe") }
2093sub pp_tie { listop(@_, "tie") }
82bafd27 2094sub pp_binmode { listop(@_, "binmode") }
6e90668e
SM
2095sub pp_dbmopen { listop(@_, "dbmopen") }
2096sub pp_sselect { listop(@_, "select") }
2097sub pp_select { listop(@_, "select") }
2098sub pp_read { listop(@_, "read") }
2099sub pp_sysopen { listop(@_, "sysopen") }
2100sub pp_sysseek { listop(@_, "sysseek") }
2101sub pp_sysread { listop(@_, "sysread") }
2102sub pp_syswrite { listop(@_, "syswrite") }
2103sub pp_send { listop(@_, "send") }
2104sub pp_recv { listop(@_, "recv") }
2105sub pp_seek { listop(@_, "seek") }
6e90668e
SM
2106sub pp_fcntl { listop(@_, "fcntl") }
2107sub pp_ioctl { listop(@_, "ioctl") }
3ed82cfc 2108sub pp_flock { maybe_targmy(@_, \&listop, "flock") }
6e90668e
SM
2109sub pp_socket { listop(@_, "socket") }
2110sub pp_sockpair { listop(@_, "sockpair") }
2111sub pp_bind { listop(@_, "bind") }
2112sub pp_connect { listop(@_, "connect") }
2113sub pp_listen { listop(@_, "listen") }
2114sub pp_accept { listop(@_, "accept") }
2115sub pp_shutdown { listop(@_, "shutdown") }
2116sub pp_gsockopt { listop(@_, "getsockopt") }
2117sub pp_ssockopt { listop(@_, "setsockopt") }
3ed82cfc
GS
2118sub pp_chown { maybe_targmy(@_, \&listop, "chown") }
2119sub pp_unlink { maybe_targmy(@_, \&listop, "unlink") }
2120sub pp_chmod { maybe_targmy(@_, \&listop, "chmod") }
2121sub pp_utime { maybe_targmy(@_, \&listop, "utime") }
2122sub pp_rename { maybe_targmy(@_, \&listop, "rename") }
2123sub pp_link { maybe_targmy(@_, \&listop, "link") }
2124sub pp_symlink { maybe_targmy(@_, \&listop, "symlink") }
2125sub pp_mkdir { maybe_targmy(@_, \&listop, "mkdir") }
6e90668e
SM
2126sub pp_open_dir { listop(@_, "opendir") }
2127sub pp_seekdir { listop(@_, "seekdir") }
3ed82cfc
GS
2128sub pp_waitpid { maybe_targmy(@_, \&listop, "waitpid") }
2129sub pp_system { maybe_targmy(@_, \&listop, "system") }
2130sub pp_exec { maybe_targmy(@_, \&listop, "exec") }
2131sub pp_kill { maybe_targmy(@_, \&listop, "kill") }
2132sub pp_setpgrp { maybe_targmy(@_, \&listop, "setpgrp") }
2133sub pp_getpriority { maybe_targmy(@_, \&listop, "getpriority") }
2134sub pp_setpriority { maybe_targmy(@_, \&listop, "setpriority") }
6e90668e
SM
2135sub pp_shmget { listop(@_, "shmget") }
2136sub pp_shmctl { listop(@_, "shmctl") }
2137sub pp_shmread { listop(@_, "shmread") }
2138sub pp_shmwrite { listop(@_, "shmwrite") }
2139sub pp_msgget { listop(@_, "msgget") }
2140sub pp_msgctl { listop(@_, "msgctl") }
2141sub pp_msgsnd { listop(@_, "msgsnd") }
2142sub pp_msgrcv { listop(@_, "msgrcv") }
2143sub pp_semget { listop(@_, "semget") }
2144sub pp_semctl { listop(@_, "semctl") }
2145sub pp_semop { listop(@_, "semop") }
2146sub pp_ghbyaddr { listop(@_, "gethostbyaddr") }
2147sub pp_gnbyaddr { listop(@_, "getnetbyaddr") }
2148sub pp_gpbynumber { listop(@_, "getprotobynumber") }
2149sub pp_gsbyname { listop(@_, "getservbyname") }
2150sub pp_gsbyport { listop(@_, "getservbyport") }
2151sub pp_syscall { listop(@_, "syscall") }
2152
2153sub pp_glob {
2154 my $self = shift;
9d2c6865 2155 my($op, $cx) = @_;
6e90668e
SM
2156 my $text = $self->dq($op->first->sibling); # skip pushmark
2157 if ($text =~ /^\$?(\w|::|\`)+$/ # could look like a readline
2158 or $text =~ /[<>]/) {
2159 return 'glob(' . single_delim('qq', '"', $text) . ')';
2160 } else {
2161 return '<' . $text . '>';
2162 }
2163}
2164
f5aa8f4e
SM
2165# Truncate is special because OPf_SPECIAL makes a bareword first arg
2166# be a filehandle. This could probably be better fixed in the core
2167# by moving the GV lookup into ck_truc.
2168
2169sub pp_truncate {
2170 my $self = shift;
2171 my($op, $cx) = @_;
2172 my(@exprs);
2173 my $parens = ($cx >= 5) || $self->{'parens'};
2174 my $kid = $op->first->sibling;
acba1d67 2175 my $fh;
f5aa8f4e
SM
2176 if ($op->flags & OPf_SPECIAL) {
2177 # $kid is an OP_CONST
18228111 2178 $fh = $self->const_sv($kid)->PV;
f5aa8f4e
SM
2179 } else {
2180 $fh = $self->deparse($kid, 6);
2181 $fh = "+$fh" if not $parens and substr($fh, 0, 1) eq "(";
2182 }
2183 my $len = $self->deparse($kid->sibling, 6);
2184 if ($parens) {
2185 return "truncate($fh, $len)";
2186 } else {
2187 return "truncate $fh, $len";
2188 }
f5aa8f4e
SM
2189}
2190
6e90668e
SM
2191sub indirop {
2192 my $self = shift;
9d2c6865 2193 my($op, $cx, $name) = @_;
6e90668e
SM
2194 my($expr, @exprs);
2195 my $kid = $op->first->sibling;
2196 my $indir = "";
2197 if ($op->flags & OPf_STACKED) {
2198 $indir = $kid;
2199 $indir = $indir->first; # skip rv2gv
2200 if (is_scope($indir)) {
9d2c6865 2201 $indir = "{" . $self->deparse($indir, 0) . "}";
c73811ab
RH
2202 } elsif ($indir->name eq "const" && $indir->private & OPpCONST_BARE) {
2203 $indir = $self->const_sv($indir)->PV;
6e90668e 2204 } else {
9d2c6865 2205 $indir = $self->deparse($indir, 24);
6e90668e
SM
2206 }
2207 $indir = $indir . " ";
2208 $kid = $kid->sibling;
2209 }
7e80da18
RH
2210 if ($name eq "sort" && $op->private & (OPpSORT_NUMERIC | OPpSORT_INTEGER)) {
2211 $indir = ($op->private & OPpSORT_REVERSE) ? '{$b <=> $a} '
2212 : '{$a <=> $b} ';
2213 }
2214 elsif ($name eq "sort" && $op->private & OPpSORT_REVERSE) {
2215 $indir = '{$b cmp $a} ';
2216 }
6e90668e 2217 for (; !null($kid); $kid = $kid->sibling) {
9d2c6865 2218 $expr = $self->deparse($kid, 6);
6e90668e
SM
2219 push @exprs, $expr;
2220 }
3ed82cfc 2221 return $self->maybe_parens_func($name, $indir . join(", ", @exprs),
9d2c6865 2222 $cx, 5);
6e90668e
SM
2223}
2224
2225sub pp_prtf { indirop(@_, "printf") }
2226sub pp_print { indirop(@_, "print") }
2227sub pp_sort { indirop(@_, "sort") }
2228
2229sub mapop {
2230 my $self = shift;
9d2c6865 2231 my($op, $cx, $name) = @_;
6e90668e
SM
2232 my($expr, @exprs);
2233 my $kid = $op->first; # this is the (map|grep)start
2234 $kid = $kid->first->sibling; # skip a pushmark
2235 my $code = $kid->first; # skip a null
2236 if (is_scope $code) {
f4a44678 2237 $code = "{" . $self->deparse($code, 0) . "} ";
6e90668e 2238 } else {
9d2c6865 2239 $code = $self->deparse($code, 24) . ", ";
6e90668e
SM
2240 }
2241 $kid = $kid->sibling;
2242 for (; !null($kid); $kid = $kid->sibling) {
9d2c6865 2243 $expr = $self->deparse($kid, 6);
6e90668e
SM
2244 push @exprs, $expr if $expr;
2245 }
9d2c6865 2246 return $self->maybe_parens_func($name, $code . join(", ", @exprs), $cx, 5);
6e90668e
SM
2247}
2248
2249sub pp_mapwhile { mapop(@_, "map") }
2250sub pp_grepwhile { mapop(@_, "grep") }
2251
2252sub pp_list {
2253 my $self = shift;
9d2c6865 2254 my($op, $cx) = @_;
6e90668e
SM
2255 my($expr, @exprs);
2256 my $kid = $op->first->sibling; # skip pushmark
2257 my $lop;
ce4e655d 2258 my $local = "either"; # could be local(...), my(...) or our(...)
6e90668e
SM
2259 for ($lop = $kid; !null($lop); $lop = $lop->sibling) {
2260 # This assumes that no other private flags equal 128, and that
2261 # OPs that store things other than flags in their op_private,
2262 # like OP_AELEMFAST, won't be immediate children of a list.
b8e103fc
RH
2263 #
2264 # OP_ENTERSUB can break this logic, so check for it.
2265 # I suspect that open and exit can too.
2266
2267 if (!($lop->private & (OPpLVAL_INTRO|OPpOUR_INTRO)
ce4e655d 2268 or $lop->name eq "undef")
b8e103fc
RH
2269 or $lop->name eq "entersub"
2270 or $lop->name eq "exit"
2271 or $lop->name eq "open")
6e90668e
SM
2272 {
2273 $local = ""; # or not
2274 last;
2275 }
3f872cb9 2276 if ($lop->name =~ /^pad[ash]v$/) { # my()
ce4e655d 2277 ($local = "", last) if $local eq "local" || $local eq "our";
6e90668e 2278 $local = "my";
b8e103fc
RH
2279 } elsif ($lop->name =~ /^(gv|rv2)[ash]v$/
2280 && $lop->private & OPpOUR_INTRO
2281 or $lop->name eq "null" && $lop->first->name eq "gvsv"
2282 && $lop->first->private & OPpOUR_INTRO) { # our()
ce4e655d
RH
2283 ($local = "", last) if $local eq "my" || $local eq "local";
2284 $local = "our";
3f872cb9 2285 } elsif ($lop->name ne "undef") { # local()
ce4e655d 2286 ($local = "", last) if $local eq "my" || $local eq "our";
6e90668e
SM
2287 $local = "local";
2288 }
2289 }
2290 $local = "" if $local eq "either"; # no point if it's all undefs
f5aa8f4e 2291 return $self->deparse($kid, $cx) if null $kid->sibling and not $local;
6e90668e
SM
2292 for (; !null($kid); $kid = $kid->sibling) {
2293 if ($local) {
3f872cb9 2294 if (class($kid) eq "UNOP" and $kid->first->name eq "gvsv") {
6e90668e
SM
2295 $lop = $kid->first;
2296 } else {
2297 $lop = $kid;
2298 }
2299 $self->{'avoid_local'}{$$lop}++;
9d2c6865 2300 $expr = $self->deparse($kid, 6);
6e90668e
SM
2301 delete $self->{'avoid_local'}{$$lop};
2302 } else {
9d2c6865 2303 $expr = $self->deparse($kid, 6);
6e90668e
SM
2304 }
2305 push @exprs, $expr;
2306 }
9d2c6865
SM
2307 if ($local) {
2308 return "$local(" . join(", ", @exprs) . ")";
2309 } else {
2310 return $self->maybe_parens( join(", ", @exprs), $cx, 6);
2311 }
6e90668e
SM
2312}
2313
6f611a1a
GS
2314sub is_ifelse_cont {
2315 my $op = shift;
2316 return ($op->name eq "null" and class($op) eq "UNOP"
2317 and $op->first->name =~ /^(and|cond_expr)$/
2318 and is_scope($op->first->first->sibling));
2319}
2320
6e90668e
SM
2321sub pp_cond_expr {
2322 my $self = shift;
9d2c6865 2323 my($op, $cx) = @_;
6e90668e
SM
2324 my $cond = $op->first;
2325 my $true = $cond->sibling;
2326 my $false = $true->sibling;
9d2c6865 2327 my $cuddle = $self->{'cuddle'};
6f611a1a 2328 unless ($cx == 0 and (is_scope($true) and $true->name ne "null") and
58cccf98
SM
2329 (is_scope($false) || is_ifelse_cont($false))
2330 and $self->{'expand'} < 7) {
f5aa8f4e 2331 $cond = $self->deparse($cond, 8);
9d2c6865
SM
2332 $true = $self->deparse($true, 8);
2333 $false = $self->deparse($false, 8);
2334 return $self->maybe_parens("$cond ? $true : $false", $cx, 8);
6f611a1a
GS
2335 }
2336
f5aa8f4e 2337 $cond = $self->deparse($cond, 1);
9d2c6865 2338 $true = $self->deparse($true, 0);
6f611a1a
GS
2339 my $head = "if ($cond) {\n\t$true\n\b}";
2340 my @elsifs;
2341 while (!null($false) and is_ifelse_cont($false)) {
2342 my $newop = $false->first;
2343 my $newcond = $newop->first;
2344 my $newtrue = $newcond->sibling;
2345 $false = $newtrue->sibling; # last in chain is OP_AND => no else
2346 $newcond = $self->deparse($newcond, 1);
2347 $newtrue = $self->deparse($newtrue, 0);
2348 push @elsifs, "elsif ($newcond) {\n\t$newtrue\n\b}";
2349 }
2350 if (!null($false)) {
2351 $false = $cuddle . "else {\n\t" .
2352 $self->deparse($false, 0) . "\n\b}\cK";
2353 } else {
2354 $false = "\cK";
6e90668e 2355 }
6f611a1a 2356 return $head . join($cuddle, "", @elsifs) . $false;
6e90668e
SM
2357}
2358
58cccf98 2359sub loop_common {
6e90668e 2360 my $self = shift;
58cccf98 2361 my($op, $cx, $init) = @_;
6e90668e
SM
2362 my $enter = $op->first;
2363 my $kid = $enter->sibling;
a0405c92
RH
2364 local(@$self{qw'curstash warnings hints'})
2365 = @$self{qw'curstash warnings hints'};
6e90668e 2366 my $head = "";
9d2c6865 2367 my $bare = 0;
58cccf98
SM
2368 my $body;
2369 my $cond = undef;
3f872cb9 2370 if ($kid->name eq "lineseq") { # bare or infinite loop
6e90668e 2371 if (is_state $kid->last) { # infinite
e99ebc55 2372 $head = "while (1) "; # Can't use for(;;) if there's a continue
58cccf98 2373 $cond = "";
9d2c6865
SM
2374 } else {
2375 $bare = 1;
6e90668e 2376 }
58cccf98 2377 $body = $kid;
3f872cb9 2378 } elsif ($enter->name eq "enteriter") { # foreach
6e90668e
SM
2379 my $ary = $enter->first->sibling; # first was pushmark
2380 my $var = $ary->sibling;
f5aa8f4e
SM
2381 if ($enter->flags & OPf_STACKED
2382 and not null $ary->first->sibling->sibling)
2383 {
d7f5b6da
SM
2384 $ary = $self->deparse($ary->first->sibling, 9) . " .. " .
2385 $self->deparse($ary->first->sibling->sibling, 9);
d8d95777
GA
2386 } else {
2387 $ary = $self->deparse($ary, 1);
2388 }
6e90668e 2389 if (null $var) {
f6f9bdb7 2390 if ($enter->flags & OPf_SPECIAL) { # thread special var
9d2c6865 2391 $var = $self->pp_threadsv($enter, 1);
f6f9bdb7 2392 } else { # regular my() variable
9d2c6865 2393 $var = $self->pp_padsv($enter, 1);
f6f9bdb7
SM
2394 if ($self->padname_sv($enter->targ)->IVX ==
2395 $kid->first->first->sibling->last->cop_seq)
2396 {
2397 # If the scope of this variable closes at the last
2398 # statement of the loop, it must have been
2399 # declared here.
2400 $var = "my " . $var;
2401 }
6e90668e 2402 }
3f872cb9 2403 } elsif ($var->name eq "rv2gv") {
9d2c6865 2404 $var = $self->pp_rv2sv($var, 1);
3f872cb9 2405 } elsif ($var->name eq "gv") {
9d2c6865 2406 $var = "\$" . $self->deparse($var, 1);
6e90668e 2407 }
9d2c6865 2408 $head = "foreach $var ($ary) ";
58cccf98 2409 $body = $kid->first->first->sibling; # skip OP_AND and OP_ITER
3f872cb9 2410 } elsif ($kid->name eq "null") { # while/until
6e90668e 2411 $kid = $kid->first;
58cccf98
SM
2412 my $name = {"and" => "while", "or" => "until"}->{$kid->name};
2413 $cond = $self->deparse($kid->first, 1);
2414 $head = "$name ($cond) ";
2415 $body = $kid->first->sibling;
3f872cb9 2416 } elsif ($kid->name eq "stub") { # bare and empty
9d2c6865 2417 return "{;}"; # {} could be a hashref
6e90668e 2418 }
58cccf98
SM
2419 # If there isn't a continue block, then the next pointer for the loop
2420 # will point to the unstack, which is kid's penultimate child, except
2421 # in a bare loop, when it will point to the leaveloop. When neither of
2422 # these conditions hold, then the third-to-last child in the continue
2423 # block (or the last in a bare loop).
2424 my $cont_start = $enter->nextop;
2425 my $cont;
c73811ab 2426 if ($$cont_start != $$op && ${$cont_start->sibling} != ${$body->last}) {
58cccf98
SM
2427 if ($bare) {
2428 $cont = $body->last;
2429 } else {
2430 $cont = $body->first;
2431 while (!null($cont->sibling->sibling->sibling)) {
2432 $cont = $cont->sibling;
2433 }
2434 }
2435 my $state = $body->first;
2436 my $cuddle = $self->{'cuddle'};
2437 my @states;
2438 for (; $$state != $$cont; $state = $state->sibling) {
2439 push @states, $state;
2440 }
ce4e655d 2441 $body = $self->lineseq(undef, @states);
58cccf98
SM
2442 if (defined $cond and not is_scope $cont and $self->{'expand'} < 3) {
2443 $head = "for ($init; $cond; " . $self->deparse($cont, 1) .") ";
2444 $cont = "\cK";
2445 } else {
2446 $cont = $cuddle . "continue {\n\t" .
2447 $self->deparse($cont, 0) . "\n\b}\cK";
6e90668e 2448 }
6e90668e 2449 } else {
7a9b44b9 2450 return "" if !defined $body;
c73811ab
RH
2451 if (length $init) {
2452 $head = "for ($init; $cond;) ";
2453 }
9d2c6865 2454 $cont = "\cK";
58cccf98 2455 $body = $self->deparse($body, 0);
6e90668e 2456 }
ce4e655d 2457 $body =~ s/;?$/;\n/;
34a48b4b
RH
2458
2459 return $head . "{\n\t" . $body . "\b}" . $cont;
58cccf98
SM
2460}
2461
2462sub pp_leaveloop { loop_common(@_, "") }
2463
2464sub for_loop {
2465 my $self = shift;
2466 my($op, $cx) = @_;
2467 my $init = $self->deparse($op, 1);
c73811ab 2468 return $self->loop_common($op->sibling->first->sibling, $cx, $init);
6e90668e
SM
2469}
2470
2471sub pp_leavetry {
2472 my $self = shift;
9d2c6865 2473 return "eval {\n\t" . $self->pp_leave(@_) . "\n\b}";
bd0865ec 2474}
6e90668e 2475
bd0865ec
GS
2476BEGIN { eval "sub OP_CONST () {" . opnumber("const") . "}" }
2477BEGIN { eval "sub OP_STRINGIFY () {" . opnumber("stringify") . "}" }
a9760014 2478BEGIN { eval "sub OP_RV2SV () {" . opnumber("rv2sv") . "}" }
90c0eb26 2479BEGIN { eval "sub OP_LIST () {" . opnumber("list") . "}" }
f5aa8f4e 2480
a798dbf2 2481sub pp_null {
6e90668e 2482 my $self = shift;
9d2c6865 2483 my($op, $cx) = @_;
6e90668e 2484 if (class($op) eq "OP") {
f4a44678
SM
2485 # old value is lost
2486 return $self->{'ex_const'} if $op->targ == OP_CONST;
3f872cb9 2487 } elsif ($op->first->name eq "pushmark") {
9d2c6865 2488 return $self->pp_list($op, $cx);
3f872cb9 2489 } elsif ($op->first->name eq "enter") {
9d2c6865 2490 return $self->pp_leave($op, $cx);
bd0865ec 2491 } elsif ($op->targ == OP_STRINGIFY) {
6f611a1a 2492 return $self->dquote($op, $cx);
6e90668e 2493 } elsif (!null($op->first->sibling) and
3f872cb9 2494 $op->first->sibling->name eq "readline" and
6e90668e 2495 $op->first->sibling->flags & OPf_STACKED) {
9d2c6865
SM
2496 return $self->maybe_parens($self->deparse($op->first, 7) . " = "
2497 . $self->deparse($op->first->sibling, 7),
2498 $cx, 7);
6e90668e 2499 } elsif (!null($op->first->sibling) and
3f872cb9 2500 $op->first->sibling->name eq "trans" and
6e90668e 2501 $op->first->sibling->flags & OPf_STACKED) {
9d2c6865
SM
2502 return $self->maybe_parens($self->deparse($op->first, 20) . " =~ "
2503 . $self->deparse($op->first->sibling, 20),
2504 $cx, 20);
c102638c
RH
2505 } elsif ($op->flags & OPf_SPECIAL && $cx == 0 && !$op->targ) {
2506 return "do {\n\t". $self->deparse($op->first, $cx) ."\n\b};";
ad8caead
RGS
2507 } elsif (!null($op->first->sibling) and
2508 $op->first->sibling->name eq "null" and
2509 class($op->first->sibling) eq "UNOP" and
2510 $op->first->sibling->first->flags & OPf_STACKED and
2511 $op->first->sibling->first->name eq "rcatline") {
2512 return $self->maybe_parens($self->deparse($op->first, 18) . " .= "
2513 . $self->deparse($op->first->sibling, 18),
2514 $cx, 18);
6e90668e 2515 } else {
9d2c6865 2516 return $self->deparse($op->first, $cx);
6e90668e 2517 }
a798dbf2
MB
2518}
2519
6e90668e
SM
2520sub padname {
2521 my $self = shift;
2522 my $targ = shift;
68223ea3 2523 return $self->padname_sv($targ)->PVX;
6e90668e
SM
2524}
2525
2526sub padany {
2527 my $self = shift;
2528 my $op = shift;
2529 return substr($self->padname($op->targ), 1); # skip $/@/%
2530}
2531
2532sub pp_padsv {
2533 my $self = shift;
9d2c6865
SM
2534 my($op, $cx) = @_;
2535 return $self->maybe_my($op, $cx, $self->padname($op->targ));
6e90668e
SM
2536}
2537
2538sub pp_padav { pp_padsv(@_) }
2539sub pp_padhv { pp_padsv(@_) }
2540
9d2c6865
SM
2541my @threadsv_names;
2542
2543BEGIN {
2544 @threadsv_names = ("_", "1", "2", "3", "4", "5", "6", "7", "8", "9",
2545 "&", "`", "'", "+", "/", ".", ",", "\\", '"', ";",
2546 "^", "-", "%", "=", "|", "~", ":", "^A", "^E",
2547 "!", "@");
2548}
f6f9bdb7
SM
2549
2550sub pp_threadsv {
2551 my $self = shift;
9d2c6865
SM
2552 my($op, $cx) = @_;
2553 return $self->maybe_local($op, $cx, "\$" . $threadsv_names[$op->targ]);
f6f9bdb7
SM
2554}
2555
6f611a1a 2556sub gv_or_padgv {
18228111
GS
2557 my $self = shift;
2558 my $op = shift;
6f611a1a
GS
2559 if (class($op) eq "PADOP") {
2560 return $self->padval($op->padix);
2561 } else { # class($op) eq "SVOP"
2562 return $op->gv;
18228111 2563 }
18228111
GS
2564}
2565
6e90668e
SM
2566sub pp_gvsv {
2567 my $self = shift;
9d2c6865 2568 my($op, $cx) = @_;
6f611a1a 2569 my $gv = $self->gv_or_padgv($op);
8510e997
RH
2570 return $self->maybe_local($op, $cx, $self->stash_variable("\$",
2571 $self->gv_name($gv)));
6e90668e
SM
2572}
2573
2574sub pp_gv {
2575 my $self = shift;
9d2c6865 2576 my($op, $cx) = @_;
6f611a1a 2577 my $gv = $self->gv_or_padgv($op);
18228111 2578 return $self->gv_name($gv);
6e90668e
SM
2579}
2580
2581sub pp_aelemfast {
2582 my $self = shift;
9d2c6865 2583 my($op, $cx) = @_;
6f611a1a 2584 my $gv = $self->gv_or_padgv($op);
ce4e655d
RH
2585 my $name = $self->gv_name($gv);
2586 $name = $self->{'curstash'}."::$name"
2587 if $name !~ /::/ && $self->lex_in_scope('@'.$name);
2588
2589 return "\$" . $name . "[" .
7a9b44b9 2590 ($op->private + $self->{'arybase'}) . "]";
6e90668e
SM
2591}
2592
2593sub rv2x {
2594 my $self = shift;
9d2c6865 2595 my($op, $cx, $type) = @_;
90c0eb26
RH
2596
2597 if (class($op) eq 'NULL' || !$op->can("first")) {
2598 Carp::cluck("Unexpected op in pp_rv2x");
2599 return 'XXX';
2600 }
6e90668e 2601 my $kid = $op->first;
f5aa8f4e 2602 my $str = $self->deparse($kid, 0);
8510e997
RH
2603 return $self->stash_variable($type, $str) if is_scalar($kid);
2604 return $type ."{$str}";
6e90668e
SM
2605}
2606
2607sub pp_rv2sv { maybe_local(@_, rv2x(@_, "\$")) }
2608sub pp_rv2hv { maybe_local(@_, rv2x(@_, "%")) }
2609sub pp_rv2gv { maybe_local(@_, rv2x(@_, "*")) }
2610
2611# skip rv2av
2612sub pp_av2arylen {
2613 my $self = shift;
9d2c6865 2614 my($op, $cx) = @_;
3f872cb9 2615 if ($op->first->name eq "padav") {
9d2c6865 2616 return $self->maybe_local($op, $cx, '$#' . $self->padany($op->first));
6e90668e 2617 } else {
f5aa8f4e
SM
2618 return $self->maybe_local($op, $cx,
2619 $self->rv2x($op->first, $cx, '$#'));
6e90668e
SM
2620 }
2621}
2622
2623# skip down to the old, ex-rv2cv
90c0eb26
RH
2624sub pp_rv2cv {
2625 my ($self, $op, $cx) = @_;
2626 if (!null($op->first) && $op->first->name eq 'null' &&
2627 $op->first->targ eq OP_LIST)
2628 {
2629 return $self->rv2x($op->first->first->sibling, $cx, "&")
2630 }
2631 else {
2632 return $self->rv2x($op, $cx, "")
2633 }
2634}
6e90668e
SM
2635
2636sub pp_rv2av {
2637 my $self = shift;
9d2c6865 2638 my($op, $cx) = @_;
6e90668e 2639 my $kid = $op->first;
3f872cb9 2640 if ($kid->name eq "const") { # constant list
18228111 2641 my $av = $self->const_sv($kid);
6e90668e
SM
2642 return "(" . join(", ", map(const($_), $av->ARRAY)) . ")";
2643 } else {
9d2c6865 2644 return $self->maybe_local($op, $cx, $self->rv2x($op, $cx, "\@"));
6e90668e
SM
2645 }
2646 }
2647
3ed82cfc
GS
2648sub is_subscriptable {
2649 my $op = shift;
2650 if ($op->name =~ /^[ahg]elem/) {
2651 return 1;
2652 } elsif ($op->name eq "entersub") {
2653 my $kid = $op->first;
2654 return 0 unless null $kid->sibling;
2655 $kid = $kid->first;
2656 $kid = $kid->sibling until null $kid->sibling;
2657 return 0 if is_scope($kid);
2658 $kid = $kid->first;
2659 return 0 if $kid->name eq "gv";
2660 return 0 if is_scalar($kid);
2661 return is_subscriptable($kid);
2662 } else {
2663 return 0;
2664 }
2665}
6e90668e
SM
2666
2667sub elem {
2668 my $self = shift;
9d2c6865 2669 my ($op, $cx, $left, $right, $padname) = @_;
6e90668e 2670 my($array, $idx) = ($op->first, $op->first->sibling);
3f872cb9 2671 unless ($array->name eq $padname) { # Maybe this has been fixed
6e90668e
SM
2672 $array = $array->first; # skip rv2av (or ex-rv2av in _53+)
2673 }
3f872cb9 2674 if ($array->name eq $padname) {
6e90668e
SM
2675 $array = $self->padany($array);
2676 } elsif (is_scope($array)) { # ${expr}[0]
9d2c6865 2677 $array = "{" . $self->deparse($array, 0) . "}";
ce4e655d
RH
2678 } elsif ($array->name eq "gv") {
2679 $array = $self->gv_name($self->gv_or_padgv($array));
2680 if ($array !~ /::/) {
2681 my $prefix = ($left eq '[' ? '@' : '%');
2682 $array = $self->{curstash}.'::'.$array
2683 if $self->lex_in_scope($prefix . $array);
2684 }
6e90668e 2685 } elsif (is_scalar $array) { # $x[0], $$x[0], ...
9d2c6865 2686 $array = $self->deparse($array, 24);
6e90668e
SM
2687 } else {
2688 # $x[20][3]{hi} or expr->[20]
3ed82cfc 2689 my $arrow = is_subscriptable($array) ? "" : "->";
9d2c6865
SM
2690 return $self->deparse($array, 24) . $arrow .
2691 $left . $self->deparse($idx, 1) . $right;
6e90668e 2692 }
9d2c6865 2693 $idx = $self->deparse($idx, 1);
7a9b44b9
RH
2694
2695 # Outer parens in an array index will confuse perl
2696 # if we're interpolating in a regular expression, i.e.
2697 # /$x$foo[(-1)]/ is *not* the same as /$x$foo[-1]/
2698 #
2699 # If $self->{parens}, then an initial '(' will
2700 # definitely be paired with a final ')'. If
2701 # !$self->{parens}, the misleading parens won't
2702 # have been added in the first place.
2703 #
2704 # [You might think that we could get "(...)...(...)"
2705 # where the initial and final parens do not match
2706 # each other. But we can't, because the above would
2707 # only happen if there's an infix binop between the
2708 # two pairs of parens, and *that* means that the whole
2709 # expression would be parenthesized as well.]
2710 #
2711 $idx =~ s/^\((.*)\)$/$1/ if $self->{'parens'};
2712
098251bc
RH
2713 # Hash-element braces will autoquote a bareword inside themselves.
2714 # We need to make sure that C<$hash{warn()}> doesn't come out as
2715 # C<$hash{warn}>, which has a quite different meaning. Currently
2716 # B::Deparse will always quote strings, even if the string was a
2717 # bareword in the original (i.e. the OPpCONST_BARE flag is ignored
2718 # for constant strings.) So we can cheat slightly here - if we see
2719 # a bareword, we know that it is supposed to be a function call.
2720 #
2721 $idx =~ s/^([A-Za-z_]\w*)$/$1()/;
2722
6e90668e
SM
2723 return "\$" . $array . $left . $idx . $right;
2724}
2725
3f872cb9
GS
2726sub pp_aelem { maybe_local(@_, elem(@_, "[", "]", "padav")) }
2727sub pp_helem { maybe_local(@_, elem(@_, "{", "}", "padhv")) }
6e90668e
SM
2728
2729sub pp_gelem {
2730 my $self = shift;
9d2c6865 2731 my($op, $cx) = @_;
6e90668e
SM
2732 my($glob, $part) = ($op->first, $op->last);
2733 $glob = $glob->first; # skip rv2gv
3f872cb9 2734 $glob = $glob->first if $glob->name eq "rv2gv"; # this one's a bug
9d2c6865
SM
2735 my $scope = is_scope($glob);
2736 $glob = $self->deparse($glob, 0);
2737 $part = $self->deparse($part, 1);
6e90668e
SM
2738 return "*" . ($scope ? "{$glob}" : $glob) . "{$part}";
2739}
2740
2741sub slice {
2742 my $self = shift;
9d2c6865 2743 my ($op, $cx, $left, $right, $regname, $padname) = @_;
6e90668e
SM
2744 my $last;
2745 my(@elems, $kid, $array, $list);
2746 if (class($op) eq "LISTOP") {
2747 $last = $op->last;
2748 } else { # ex-hslice inside delete()
2749 for ($kid = $op->first; !null $kid->sibling; $kid = $kid->sibling) {}
2750 $last = $kid;
2751 }
2752 $array = $last;
2753 $array = $array->first
3f872cb9 2754 if $array->name eq $regname or $array->name eq "null";
6e90668e 2755 if (is_scope($array)) {
9d2c6865 2756 $array = "{" . $self->deparse($array, 0) . "}";
3f872cb9 2757 } elsif ($array->name eq $padname) {
6e90668e
SM
2758 $array = $self->padany($array);
2759 } else {
9d2c6865 2760 $array = $self->deparse($array, 24);
6e90668e
SM
2761 }
2762 $kid = $op->first->sibling; # skip pushmark
3f872cb9 2763 if ($kid->name eq "list") {
6e90668e
SM
2764 $kid = $kid->first->sibling; # skip list, pushmark
2765 for (; !null $kid; $kid = $kid->sibling) {
9d2c6865 2766 push @elems, $self->deparse($kid, 6);
6e90668e
SM
2767 }
2768 $list = join(", ", @elems);
2769 } else {
9d2c6865 2770 $list = $self->deparse($kid, 1);
6e90668e
SM
2771 }
2772 return "\@" . $array . $left . $list . $right;
2773}
2774
3ed82cfc
GS
2775sub pp_aslice { maybe_local(@_, slice(@_, "[", "]", "rv2av", "padav")) }
2776sub pp_hslice { maybe_local(@_, slice(@_, "{", "}", "rv2hv", "padhv")) }
6e90668e
SM
2777
2778sub pp_lslice {
2779 my $self = shift;
9d2c6865 2780 my($op, $cx) = @_;
6e90668e
SM
2781 my $idx = $op->first;
2782 my $list = $op->last;
2783 my(@elems, $kid);
9d2c6865
SM
2784 $list = $self->deparse($list, 1);
2785 $idx = $self->deparse($idx, 1);
2786 return "($list)" . "[$idx]";
6e90668e
SM
2787}
2788
6e90668e
SM
2789sub want_scalar {
2790 my $op = shift;
2791 return ($op->flags & OPf_WANT) == OPf_WANT_SCALAR;
2792}
2793
bd0865ec
GS
2794sub want_list {
2795 my $op = shift;
2796 return ($op->flags & OPf_WANT) == OPf_WANT_LIST;
2797}
2798
2799sub method {
6e90668e 2800 my $self = shift;
9d2c6865 2801 my($op, $cx) = @_;
bd0865ec
GS
2802 my $kid = $op->first->sibling; # skip pushmark
2803 my($meth, $obj, @exprs);
3f872cb9 2804 if ($kid->name eq "list" and want_list $kid) {
bd0865ec
GS
2805 # When an indirect object isn't a bareword but the args are in
2806 # parens, the parens aren't part of the method syntax (the LLAFR
2807 # doesn't apply), but they make a list with OPf_PARENS set that
2808 # doesn't get flattened by the append_elem that adds the method,
2809 # making a (object, arg1, arg2, ...) list where the object
2810 # usually is. This can be distinguished from
2811 # `($obj, $arg1, $arg2)->meth()' (which is legal if $arg2 is an
2812 # object) because in the later the list is in scalar context
2813 # as the left side of -> always is, while in the former
2814 # the list is in list context as method arguments always are.
2815 # (Good thing there aren't method prototypes!)
3ed82cfc 2816 $meth = $kid->sibling;
bd0865ec
GS
2817 $kid = $kid->first->sibling; # skip pushmark
2818 $obj = $kid;
6e90668e 2819 $kid = $kid->sibling;
bd0865ec 2820 for (; not null $kid; $kid = $kid->sibling) {
9d2c6865 2821 push @exprs, $self->deparse($kid, 6);
6e90668e 2822 }
bd0865ec
GS
2823 } else {
2824 $obj = $kid;
2825 $kid = $kid->sibling;
90c0eb26
RH
2826 for (; !null ($kid->sibling) && $kid->name ne "method_named";
2827 $kid = $kid->sibling) {
bd0865ec 2828 push @exprs, $self->deparse($kid, 6);
6e90668e 2829 }
3ed82cfc 2830 $meth = $kid;
bd0865ec
GS
2831 }
2832 $obj = $self->deparse($obj, 24);
3ed82cfc 2833 if ($meth->name eq "method_named") {
18228111 2834 $meth = $self->const_sv($meth)->PV;
bd0865ec 2835 } else {
3ed82cfc
GS
2836 $meth = $meth->first;
2837 if ($meth->name eq "const") {
2838 # As of 5.005_58, this case is probably obsoleted by the
2839 # method_named case above
18228111 2840 $meth = $self->const_sv($meth)->PV; # needs to be bare
3ed82cfc
GS
2841 } else {
2842 $meth = $self->deparse($meth, 1);
2843 }
bd0865ec
GS
2844 }
2845 my $args = join(", ", @exprs);
2846 $kid = $obj . "->" . $meth;
145eb477 2847 if (length $args) {
bd0865ec
GS
2848 return $kid . "(" . $args . ")"; # parens mandatory
2849 } else {
2850 return $kid;
2851 }
2852}
2853
2854# returns "&" if the prototype doesn't match the args,
2855# or ("", $args_after_prototype_demunging) if it does.
2856sub check_proto {
2857 my $self = shift;
2858 my($proto, @args) = @_;
2859 my($arg, $real);
2860 my $doneok = 0;
2861 my @reals;
2862 # An unbackslashed @ or % gobbles up the rest of the args
2863 $proto =~ s/([^\\]|^)([@%])(.*)$/$1$2/;
2864 while ($proto) {
2865 $proto =~ s/^ *([\\]?[\$\@&%*]|;)//;
2866 my $chr = $1;
2867 if ($chr eq "") {
2868 return "&" if @args;
2869 } elsif ($chr eq ";") {
2870 $doneok = 1;
2871 } elsif ($chr eq "@" or $chr eq "%") {
2872 push @reals, map($self->deparse($_, 6), @args);
2873 @args = ();
6e90668e 2874 } else {
bd0865ec
GS
2875 $arg = shift @args;
2876 last unless $arg;
2877 if ($chr eq "\$") {
2878 if (want_scalar $arg) {
2879 push @reals, $self->deparse($arg, 6);
2880 } else {
2881 return "&";
2882 }
2883 } elsif ($chr eq "&") {
3f872cb9 2884 if ($arg->name =~ /^(s?refgen|undef)$/) {
bd0865ec
GS
2885 push @reals, $self->deparse($arg, 6);
2886 } else {
2887 return "&";
2888 }
2889 } elsif ($chr eq "*") {
3f872cb9
GS
2890 if ($arg->name =~ /^s?refgen$/
2891 and $arg->first->first->name eq "rv2gv")
bd0865ec
GS
2892 {
2893 $real = $arg->first->first; # skip refgen, null
3f872cb9 2894 if ($real->first->name eq "gv") {
bd0865ec
GS
2895 push @reals, $self->deparse($real, 6);
2896 } else {
2897 push @reals, $self->deparse($real->first, 6);
2898 }
2899 } else {
2900 return "&";
2901 }
2902 } elsif (substr($chr, 0, 1) eq "\\") {
2903 $chr = substr($chr, 1);
3f872cb9 2904 if ($arg->name =~ /^s?refgen$/ and
bd0865ec
GS
2905 !null($real = $arg->first) and
2906 ($chr eq "\$" && is_scalar($real->first)
2907 or ($chr eq "\@"
3f872cb9
GS
2908 && $real->first->sibling->name
2909 =~ /^(rv2|pad)av$/)
bd0865ec 2910 or ($chr eq "%"
3f872cb9
GS
2911 && $real->first->sibling->name
2912 =~ /^(rv2|pad)hv$/)
bd0865ec 2913 #or ($chr eq "&" # This doesn't work
3f872cb9 2914 # && $real->first->name eq "rv2cv")
bd0865ec 2915 or ($chr eq "*"
3f872cb9 2916 && $real->first->name eq "rv2gv")))
bd0865ec
GS
2917 {
2918 push @reals, $self->deparse($real, 6);
2919 } else {
2920 return "&";
2921 }
2922 }
2923 }
9d2c6865 2924 }
bd0865ec
GS
2925 return "&" if $proto and !$doneok; # too few args and no `;'
2926 return "&" if @args; # too many args
2927 return ("", join ", ", @reals);
2928}
2929
2930sub pp_entersub {
2931 my $self = shift;
2932 my($op, $cx) = @_;
2933 return $self->method($op, $cx) unless null $op->first->sibling;
2934 my $prefix = "";
2935 my $amper = "";
2936 my($kid, @exprs);
90c0eb26 2937 if ($op->flags & OPf_SPECIAL && !($op->flags & OPf_MOD)) {
9d2c6865
SM
2938 $prefix = "do ";
2939 } elsif ($op->private & OPpENTERSUB_AMPER) {
2940 $amper = "&";
2941 }
2942 $kid = $op->first;
2943 $kid = $kid->first->sibling; # skip ex-list, pushmark
2944 for (; not null $kid->sibling; $kid = $kid->sibling) {
2945 push @exprs, $kid;
2946 }
bd0865ec
GS
2947 my $simple = 0;
2948 my $proto = undef;
9d2c6865
SM
2949 if (is_scope($kid)) {
2950 $amper = "&";
2951 $kid = "{" . $self->deparse($kid, 0) . "}";
3f872cb9 2952 } elsif ($kid->first->name eq "gv") {
6f611a1a 2953 my $gv = $self->gv_or_padgv($kid->first);
9d2c6865
SM
2954 if (class($gv->CV) ne "SPECIAL") {
2955 $proto = $gv->CV->PV if $gv->CV->FLAGS & SVf_POK;
2956 }
bd0865ec 2957 $simple = 1; # only calls of named functions can be prototyped
9d2c6865 2958 $kid = $self->deparse($kid, 24);
90c0eb26 2959 } elsif (is_scalar ($kid->first) && $kid->first->name ne 'rv2cv') {
9d2c6865
SM
2960 $amper = "&";
2961 $kid = $self->deparse($kid, 24);
2962 } else {
2963 $prefix = "";
3ed82cfc
GS
2964 my $arrow = is_subscriptable($kid->first) ? "" : "->";
2965 $kid = $self->deparse($kid, 24) . $arrow;
9d2c6865 2966 }
0ca62a8e
RH
2967
2968 # Doesn't matter how many prototypes there are, if
2969 # they haven't happened yet!
1d38190f
RGS
2970 my $declared;
2971 {
2972 no strict 'refs';
2973 no warnings 'uninitialized';
2974 $declared = exists $self->{'subs_declared'}{$kid}
2975 || (
2976 defined &{ %{$self->{'curstash'}."::"}->{$kid} }
2977 && !exists
2978 $self->{'subs_deparsed'}{$self->{'curstash'}."::".$kid}
2979 && defined prototype $self->{'curstash'}."::".$kid
2980 );
2981 if (!$declared && defined($proto)) {
2982 # Avoid "too early to check prototype" warning
2983 ($amper, $proto) = ('&');
2984 }
e99ebc55 2985 }
0ca62a8e 2986
bd0865ec 2987 my $args;
0ca62a8e 2988 if ($declared and defined $proto and not $amper) {
bd0865ec
GS
2989 ($amper, $args) = $self->check_proto($proto, @exprs);
2990 if ($amper eq "&") {
9d2c6865
SM
2991 $args = join(", ", map($self->deparse($_, 6), @exprs));
2992 }
2993 } else {
2994 $args = join(", ", map($self->deparse($_, 6), @exprs));
6e90668e 2995 }
9d2c6865
SM
2996 if ($prefix or $amper) {
2997 if ($op->flags & OPf_STACKED) {
2998 return $prefix . $amper . $kid . "(" . $args . ")";
2999 } else {
3000 return $prefix . $amper. $kid;
3001 }
6e90668e 3002 } else {
34a48b4b 3003 # glob() invocations can be translated into calls of
d1be9408 3004 # CORE::GLOBAL::glob with a second parameter, a number.
34a48b4b
RH
3005 # Reverse this.
3006 if ($kid eq "CORE::GLOBAL::glob") {
3007 $kid = "glob";
3008 $args =~ s/\s*,[^,]+$//;
3009 }
3010
3011 # It's a syntax error to call CORE::GLOBAL::foo without a prefix,
3012 # so it must have been translated from a keyword call. Translate
3013 # it back.
3014 $kid =~ s/^CORE::GLOBAL:://;
3015
0ca62a8e
RH
3016 if (!$declared) {
3017 return "$kid(" . $args . ")";
3018 } elsif (defined $proto and $proto eq "") {
9d2c6865 3019 return $kid;
ce4e655d 3020 } elsif (defined $proto and $proto eq "\$" and is_scalar($exprs[0])) {
9d2c6865 3021 return $self->maybe_parens_func($kid, $args, $cx, 16);
6f611a1a 3022 } elsif (defined($proto) && $proto or $simple) {
9d2c6865
SM
3023 return $self->maybe_parens_func($kid, $args, $cx, 5);
3024 } else {
3025 return "$kid(" . $args . ")";
3026 }
6e90668e
SM
3027 }
3028}
3029
3030sub pp_enterwrite { unop(@_, "write") }
3031
3032# escape things that cause interpolation in double quotes,
3033# but not character escapes
3034sub uninterp {
3035 my($str) = @_;
3f766ba3 3036 $str =~ s/(^|\G|[^\\])((?:\\\\)*)([\$\@]|\\[uUlLQE])/$1$2\\$3/g;
9d2c6865
SM
3037 return $str;
3038}
3039
b7dad2dc
RH
3040{
3041my $bal;
3042BEGIN {
cdf8218f
RH
3043 use re "eval";
3044 # Matches any string which is balanced with respect to {braces}
b7dad2dc 3045 $bal = qr(
cdf8218f
RH
3046 (?:
3047 [^\\{}]
3048 | \\\\
3049 | \\[{}]
3050 | \{(??{$bal})\}
3051 )*
3052 )x;
b7dad2dc
RH
3053}
3054
3055# the same, but treat $|, $), $( and $ at the end of the string differently
3056sub re_uninterp {
3057 my($str) = @_;
cdf8218f
RH
3058
3059 $str =~ s/
3060 ( ^|\G # $1
3061 | [^\\]
3062 )
3063
3064 ( # $2
3065 (?:\\\\)*
3066 )
3067
3068 ( # $3
3069 (\(\?\??\{$bal\}\)) # $4
3070 | [\$\@]
3071 (?!\||\)|\(|$)
3072 | \\[uUlLQE]
3073 )
3074
3075 /length($4) ? "$1$2$4" : "$1$2\\$3"/xeg;
3076
6e90668e
SM
3077 return $str;
3078}
3079
b7dad2dc
RH
3080# This is for regular expressions with the /x modifier
3081# We have to leave comments unmangled.
a9760014 3082sub re_uninterp_extended {
b7dad2dc
RH
3083 my($str) = @_;
3084
3085 $str =~ s/
3086 ( ^|\G # $1
3087 | [^\\]
3088 )
3089
3090 ( # $2
3091 (?:\\\\)*
3092 )
3093
3094 ( # $3
3095 ( \(\?\??\{$bal\}\) # $4 (skip over (?{}) and (??{}) blocks)
3096 | \#[^\n]* # (skip over comments)
3097 )
3098 | [\$\@]
3099 (?!\||\)|\(|$)
3100 | \\[uUlLQE]
3101 )
3102
3103 /length($4) ? "$1$2$4" : "$1$2\\$3"/xeg;
3104
a9760014
RH
3105 return $str;
3106}
b7dad2dc 3107}
a9760014 3108
6e90668e 3109# character escapes, but not delimiters that might need to be escaped
746698c5 3110sub escape_str { # ASCII, UTF8
6e90668e 3111 my($str) = @_;
746698c5 3112 $str =~ s/(.)/ord($1)>255 ? sprintf("\\x{%x}", ord($1)) : $1/eg;
6e90668e
SM
3113 $str =~ s/\a/\\a/g;
3114# $str =~ s/\cH/\\b/g; # \b means someting different in a regex
3115 $str =~ s/\t/\\t/g;
3116 $str =~ s/\n/\\n/g;
3117 $str =~ s/\e/\\e/g;
3118 $str =~ s/\f/\\f/g;
3119 $str =~ s/\r/\\r/g;
3120 $str =~ s/([\cA-\cZ])/'\\c' . chr(ord('@') + ord($1))/ge;
3121 $str =~ s/([\0\033-\037\177-\377])/'\\' . sprintf("%03o", ord($1))/ge;
3122 return $str;
3123}
3124
b7dad2dc
RH
3125# For regexes with the /x modifier.
3126# Leave whitespace unmangled.
a9760014
RH
3127sub escape_extended_re {
3128 my($str) = @_;
3129 $str =~ s/(.)/ord($1)>255 ? sprintf("\\x{%x}", ord($1)) : $1/eg;
3130 $str =~ s/([\0\033-\037\177-\377])/'\\' . sprintf("%03o", ord($1))/ge;
3131 $str =~ s/\n/\n\f/g;
3132 return $str;
3133}
3134
9d2c6865
SM
3135# Don't do this for regexen
3136sub unback {
3137 my($str) = @_;
3138 $str =~ s/\\/\\\\/g;
3139 return $str;
3140}
3141
08c6f5ec
RH
3142# Remove backslashes which precede literal control characters,
3143# to avoid creating ambiguity when we escape the latter.
3144sub re_unback {
3145 my($str) = @_;
3146
3147 # the insane complexity here is due to the behaviour of "\c\"
3148 $str =~ s/(^|[^\\]|\\c\\)(?<!\\c)\\(\\\\)*(?=[\0-\031\177-\377])/$1$2/g;
3149 return $str;
3150}
3151
6e90668e
SM
3152sub balanced_delim {
3153 my($str) = @_;
3154 my @str = split //, $str;
3155 my($ar, $open, $close, $fail, $c, $cnt);
3156 for $ar (['[',']'], ['(',')'], ['<','>'], ['{','}']) {
3157 ($open, $close) = @$ar;
3158 $fail = 0; $cnt = 0;
3159 for $c (@str) {
3160 if ($c eq $open) {
3161 $cnt++;
3162 } elsif ($c eq $close) {
3163 $cnt--;
3164 if ($cnt < 0) {
bd0865ec 3165 # qq()() isn't ")("
6e90668e
SM
3166 $fail = 1;
3167 last;
3168 }
3169 }
3170 }
3171 $fail = 1 if $cnt != 0;
3172 return ($open, "$open$str$close") if not $fail;
3173 }
3174 return ("", $str);
3175}
3176
3177sub single_delim {
3178 my($q, $default, $str) = @_;
90be192f 3179 return "$default$str$default" if $default and index($str, $default) == -1;
8347ad86
RGS
3180 if ($q ne 'qr') {
3181 (my $succeed, $str) = balanced_delim($str);
3182 return "$q$str" if $succeed;
3183 }
3184 for my $delim ('/', '"', '#') {
6e90668e
SM
3185 return "$q$delim" . $str . $delim if index($str, $delim) == -1;
3186 }
90be192f
SM
3187 if ($default) {
3188 $str =~ s/$default/\\$default/g;
3189 return "$default$str$default";
3190 } else {
3191 $str =~ s[/][\\/]g;
3192 return "$q/$str/";
3193 }
6e90668e
SM
3194}
3195
6e90668e
SM
3196sub const {
3197 my $sv = shift;
3198 if (class($sv) eq "SPECIAL") {
bd0865ec 3199 return ('undef', '1', '0')[$$sv-1]; # sv_undef, sv_yes, sv_no
7a9b44b9
RH
3200 } elsif (class($sv) eq "NULL") {
3201 return 'undef';
6e90668e 3202 } elsif ($sv->FLAGS & SVf_IOK) {
d9963e60 3203 return $sv->int_value;
6e90668e 3204 } elsif ($sv->FLAGS & SVf_NOK) {
fecea806
RH
3205 # try the default stringification
3206 my $r = "".$sv->NV;
3207 if ($r =~ /e/) {
3208 # If it's in scientific notation, we might have lost information
3209 return sprintf("%.20e", $sv->NV);
3210 }
3211 return $r;
7a9b44b9 3212 } elsif ($sv->FLAGS & SVf_ROK && $sv->can("RV")) {
6e90668e 3213 return "\\(" . const($sv->RV) . ")"; # constant folded
34768ba5 3214 } elsif ($sv->FLAGS & SVf_POK) {
6e90668e 3215 my $str = $sv->PV;
bd0865ec 3216 if ($str =~ /[^ -~]/) { # ASCII for non-printing
9d2c6865 3217 return single_delim("qq", '"', uninterp escape_str unback $str);
6e90668e 3218 } else {
bd0865ec 3219 return single_delim("q", "'", unback $str);
6e90668e 3220 }
34768ba5
RH
3221 } else {
3222 return "undef";
a798dbf2
MB
3223 }
3224}
3225
18228111
GS
3226sub const_sv {
3227 my $self = shift;
3228 my $op = shift;
3229 my $sv = $op->sv;
3230 # the constant could be in the pad (under useithreads)
3231 $sv = $self->padval($op->targ) unless $$sv;
3232 return $sv;
3233}
3234
6e90668e
SM
3235sub pp_const {
3236 my $self = shift;
9d2c6865 3237 my($op, $cx) = @_;
7e40138b
RH
3238 if ($op->private & OPpCONST_ARYBASE) {
3239 return '$[';
3240 }
4c1f658f 3241# if ($op->private & OPpCONST_BARE) { # trouble with `=>' autoquoting
18228111 3242# return $self->const_sv($op)->PV;
6e90668e 3243# }
18228111 3244 my $sv = $self->const_sv($op);
d5ae42cc
JM
3245# return const($sv);
3246 my $c = const $sv;
76ef7183 3247 return $c =~ /^-\d/ ? $self->maybe_parens($c, $cx, 21) : $c;
6e90668e
SM
3248}
3249
3250sub dq {
3251 my $self = shift;
3252 my $op = shift;
3f872cb9
GS
3253 my $type = $op->name;
3254 if ($type eq "const") {
f3402b25
RH
3255 return '$[' if $op->private & OPpCONST_ARYBASE;
3256 return uninterp(escape_str(unback($self->const_sv($op)->as_string)));
3f872cb9 3257 } elsif ($type eq "concat") {
8fed1104
RH
3258 my $first = $self->dq($op->first);
3259 my $last = $self->dq($op->last);
44c6d2a1 3260
b7dad2dc 3261 # Disambiguate "${foo}bar", "${foo}{bar}", "${foo}[1]"
44c6d2a1
RH
3262 ($last =~ /^[A-Z\\\^\[\]_?]/ &&
3263 $first =~ s/([\$@])\^$/${1}{^}/) # "${^}W" etc
3264 || ($last =~ /^[{\[\w_]/ &&
3265 $first =~ s/([\$@])([A-Za-z_]\w*)$/${1}{$2}/);
3266
8fed1104 3267 return $first . $last;
3f872cb9 3268 } elsif ($type eq "uc") {
6e90668e 3269 return '\U' . $self->dq($op->first->sibling) . '\E';
3f872cb9 3270 } elsif ($type eq "lc") {
6e90668e 3271 return '\L' . $self->dq($op->first->sibling) . '\E';
3f872cb9 3272 } elsif ($type eq "ucfirst") {
6e90668e 3273 return '\u' . $self->dq($op->first->sibling);
3f872cb9 3274 } elsif ($type eq "lcfirst") {
6e90668e 3275 return '\l' . $self->dq($op->first->sibling);
3f872cb9 3276 } elsif ($type eq "quotemeta") {
6e90668e 3277 return '\Q' . $self->dq($op->first->sibling) . '\E';
3f872cb9 3278 } elsif ($type eq "join") {
9d2c6865 3279 return $self->deparse($op->last, 26); # was join($", @ary)
a798dbf2 3280 } else {
9d2c6865 3281 return $self->deparse($op, 26);
6e90668e
SM
3282 }
3283}
3284
3285sub pp_backtick {
3286 my $self = shift;
9d2c6865 3287 my($op, $cx) = @_;
6e90668e
SM
3288 # skip pushmark
3289 return single_delim("qx", '`', $self->dq($op->first->sibling));
3290}
3291
3292sub dquote {
3293 my $self = shift;
6f611a1a 3294 my($op, $cx) = @_;
3ed82cfc
GS
3295 my $kid = $op->first->sibling; # skip ex-stringify, pushmark
3296 return $self->deparse($kid, $cx) if $self->{'unquote'};
3297 $self->maybe_targmy($kid, $cx,
3298 sub {single_delim("qq", '"', $self->dq($_[1]))});
6e90668e
SM
3299}
3300
bd0865ec 3301# OP_STRINGIFY is a listop, but it only ever has one arg
3ed82cfc 3302sub pp_stringify { maybe_targmy(@_, \&dquote) }
6e90668e
SM
3303
3304# tr/// and s/// (and tr[][], tr[]//, tr###, etc)
3305# note that tr(from)/to/ is OK, but not tr/from/(to)
3306sub double_delim {
3307 my($from, $to) = @_;
3308 my($succeed, $delim);
3309 if ($from !~ m[/] and $to !~ m[/]) {
3310 return "/$from/$to/";
3311 } elsif (($succeed, $from) = balanced_delim($from) and $succeed) {
3312 if (($succeed, $to) = balanced_delim($to) and $succeed) {
3313 return "$from$to";
3314 } else {
3315 for $delim ('/', '"', '#') { # note no `'' -- s''' is special
3316 return "$from$delim$to$delim" if index($to, $delim) == -1;
3317 }
3318 $to =~ s[/][\\/]g;
3319 return "$from/$to/";
3320 }
3321 } else {
3322 for $delim ('/', '"', '#') { # note no '
3323 return "$delim$from$delim$to$delim"
3324 if index($to . $from, $delim) == -1;
3325 }
3326 $from =~ s[/][\\/]g;
3327 $to =~ s[/][\\/]g;
3328 return "/$from/$to/";
3329 }
3330}
3331
2a9e2f8a 3332# Only used by tr///, so backslashes hyphens
6e90668e
SM
3333sub pchr { # ASCII
3334 my($n) = @_;
3335 if ($n == ord '\\') {
3336 return '\\\\';
2a9e2f8a
RH
3337 } elsif ($n == ord "-") {
3338 return "\\-";
6e90668e
SM
3339 } elsif ($n >= ord(' ') and $n <= ord('~')) {
3340 return chr($n);
3341 } elsif ($n == ord "\a") {
3342 return '\\a';
3343 } elsif ($n == ord "\b") {
3344 return '\\b';
3345 } elsif ($n == ord "\t") {
3346 return '\\t';
3347 } elsif ($n == ord "\n") {
3348 return '\\n';
3349 } elsif ($n == ord "\e") {
3350 return '\\e';
3351 } elsif ($n == ord "\f") {
3352 return '\\f';
3353 } elsif ($n == ord "\r") {
3354 return '\\r';
3355 } elsif ($n >= ord("\cA") and $n <= ord("\cZ")) {
3356 return '\\c' . chr(ord("@") + $n);
3357 } else {
3358# return '\x' . sprintf("%02x", $n);
3359 return '\\' . sprintf("%03o", $n);
3360 }
3361}
3362
3363sub collapse {
3364 my(@chars) = @_;
23db111c 3365 my($str, $c, $tr) = ("");
6e90668e
SM
3366 for ($c = 0; $c < @chars; $c++) {
3367 $tr = $chars[$c];
3368 $str .= pchr($tr);
3369 if ($c <= $#chars - 2 and $chars[$c + 1] == $tr + 1 and
3370 $chars[$c + 2] == $tr + 2)
3371 {
f4a44678
SM
3372 for (; $c <= $#chars-1 and $chars[$c + 1] == $chars[$c] + 1; $c++)
3373 {}
6e90668e
SM
3374 $str .= "-";
3375 $str .= pchr($chars[$c]);
3376 }
3377 }
3378 return $str;
3379}
3380
f4a44678
SM
3381sub tr_decode_byte {
3382 my($table, $flags) = @_;
2a9e2f8a 3383 my(@table) = unpack("s*", $table);
bec89253 3384 splice @table, 0x100, 1; # Number of subsequent elements
6e90668e
SM
3385 my($c, $tr, @from, @to, @delfrom, $delhyphen);
3386 if ($table[ord "-"] != -1 and
3387 $table[ord("-") - 1] == -1 || $table[ord("-") + 1] == -1)
3388 {
3389 $tr = $table[ord "-"];
3390 $table[ord "-"] = -1;
3391 if ($tr >= 0) {
3392 @from = ord("-");
3393 @to = $tr;
3394 } else { # -2 ==> delete
3395 $delhyphen = 1;
3396 }
3397 }
2a9e2f8a 3398 for ($c = 0; $c < @table; $c++) {
6e90668e
SM
3399 $tr = $table[$c];
3400 if ($tr >= 0) {
3401 push @from, $c; push @to, $tr;
3402 } elsif ($tr == -2) {
3403 push @delfrom, $c;
3404 }
3405 }
6e90668e 3406 @from = (@from, @delfrom);
f4a44678 3407 if ($flags & OPpTRANS_COMPLEMENT) {
6e90668e
SM
3408 my @newfrom = ();
3409 my %from;
3410 @from{@from} = (1) x @from;
3411 for ($c = 0; $c < 256; $c++) {
3412 push @newfrom, $c unless $from{$c};
3413 }
3414 @from = @newfrom;
3415 }
56d8b52c 3416 unless ($flags & OPpTRANS_DELETE || !@to) {
6e90668e
SM
3417 pop @to while $#to and $to[$#to] == $to[$#to -1];
3418 }
6e90668e
SM
3419 my($from, $to);
3420 $from = collapse(@from);
3421 $to = collapse(@to);
3422 $from .= "-" if $delhyphen;
f4a44678
SM
3423 return ($from, $to);
3424}
3425
3426sub tr_chr {
3427 my $x = shift;
3428 if ($x == ord "-") {
3429 return "\\-";
2a9e2f8a
RH
3430 } elsif ($x == ord "\\") {
3431 return "\\\\";
f4a44678
SM
3432 } else {
3433 return chr $x;
3434 }
3435}
3436
3437# XXX This doesn't yet handle all cases correctly either
3438
3439sub tr_decode_utf8 {
3440 my($swash_hv, $flags) = @_;
3441 my %swash = $swash_hv->ARRAY;
3442 my $final = undef;
3443 $final = $swash{'FINAL'}->IV if exists $swash{'FINAL'};
3444 my $none = $swash{"NONE"}->IV;
3445 my $extra = $none + 1;
3446 my(@from, @delfrom, @to);
3447 my $line;
3448 foreach $line (split /\n/, $swash{'LIST'}->PV) {
3449 my($min, $max, $result) = split(/\t/, $line);
3450 $min = hex $min;
3451 if (length $max) {
3452 $max = hex $max;
3453 } else {
3454 $max = $min;
3455 }
3456 $result = hex $result;
3457 if ($result == $extra) {
3458 push @delfrom, [$min, $max];
3459 } else {
3460 push @from, [$min, $max];
3461 push @to, [$result, $result + $max - $min];
3462 }
3463 }
3464 for my $i (0 .. $#from) {
3465 if ($from[$i][0] == ord '-') {
3466 unshift @from, splice(@from, $i, 1);
3467 unshift @to, splice(@to, $i, 1);
3468 last;
3469 } elsif ($from[$i][1] == ord '-') {
3470 $from[$i][1]--;
3471 $to[$i][1]--;
3472 unshift @from, ord '-';
3473 unshift @to, ord '-';
3474 last;
3475 }
3476 }
3477 for my $i (0 .. $#delfrom) {
3478 if ($delfrom[$i][0] == ord '-') {
3479 push @delfrom, splice(@delfrom, $i, 1);
3480 last;
3481 } elsif ($delfrom[$i][1] == ord '-') {
3482 $delfrom[$i][1]--;
3483 push @delfrom, ord '-';
3484 last;
3485 }
3486 }
3487 if (defined $final and $to[$#to][1] != $final) {
3488 push @to, [$final, $final];
3489 }
3490 push @from, @delfrom;
3491 if ($flags & OPpTRANS_COMPLEMENT) {
3492 my @newfrom;
3493 my $next = 0;
3494 for my $i (0 .. $#from) {
3495 push @newfrom, [$next, $from[$i][0] - 1];
3496 $next = $from[$i][1] + 1;
3497 }
3498 @from = ();
3499 for my $range (@newfrom) {
3500 if ($range->[0] <= $range->[1]) {
3501 push @from, $range;
3502 }
3503 }
3504 }
3505 my($from, $to, $diff);
3506 for my $chunk (@from) {
3507 $diff = $chunk->[1] - $chunk->[0];
3508 if ($diff > 1) {
3509 $from .= tr_chr($chunk->[0]) . "-" . tr_chr($chunk->[1]);
3510 } elsif ($diff == 1) {
3511 $from .= tr_chr($chunk->[0]) . tr_chr($chunk->[1]);
3512 } else {
3513 $from .= tr_chr($chunk->[0]);
3514 }
3515 }
3516 for my $chunk (@to) {
3517 $diff = $chunk->[1] - $chunk->[0];
3518 if ($diff > 1) {
3519 $to .= tr_chr($chunk->[0]) . "-" . tr_chr($chunk->[1]);
3520 } elsif ($diff == 1) {
3521 $to .= tr_chr($chunk->[0]) . tr_chr($chunk->[1]);
3522 } else {
3523 $to .= tr_chr($chunk->[0]);
3524 }
3525 }
3526 #$final = sprintf("%04x", $final) if defined $final;
3527 #$none = sprintf("%04x", $none) if defined $none;
3528 #$extra = sprintf("%04x", $extra) if defined $extra;
3529 #print STDERR "final: $final\n none: $none\nextra: $extra\n";
3530 #print STDERR $swash{'LIST'}->PV;
3531 return (escape_str($from), escape_str($to));
3532}
3533
3534sub pp_trans {
3535 my $self = shift;
3536 my($op, $cx) = @_;
3537 my($from, $to);
3538 if (class($op) eq "PVOP") {
3539 ($from, $to) = tr_decode_byte($op->pv, $op->private);
3540 } else { # class($op) eq "SVOP"
3541 ($from, $to) = tr_decode_utf8($op->sv->RV, $op->private);
3542 }
3543 my $flags = "";
3544 $flags .= "c" if $op->private & OPpTRANS_COMPLEMENT;
3545 $flags .= "d" if $op->private & OPpTRANS_DELETE;
3546 $to = "" if $from eq $to and $flags eq "";
3547 $flags .= "s" if $op->private & OPpTRANS_SQUASH;
6e90668e
SM
3548 return "tr" . double_delim($from, $to) . $flags;
3549}
3550
3551# Like dq(), but different
3552sub re_dq {
3553 my $self = shift;
a9760014
RH
3554 my ($op, $extended) = @_;
3555
3f872cb9
GS
3556 my $type = $op->name;
3557 if ($type eq "const") {
f3402b25 3558 return '$[' if $op->private & OPpCONST_ARYBASE;
a9760014
RH
3559 my $unbacked = re_unback($self->const_sv($op)->as_string);
3560 return re_uninterp_extended(escape_extended_re($unbacked))
3561 if $extended;
3562 return re_uninterp(escape_str($unbacked));
3f872cb9 3563 } elsif ($type eq "concat") {
a9760014
RH
3564 my $first = $self->re_dq($op->first, $extended);
3565 my $last = $self->re_dq($op->last, $extended);
b73b7152 3566
a0e66df8 3567 # Disambiguate "${foo}bar", "${foo}{bar}", "${foo}[1]"
b73b7152
JH
3568 ($last =~ /^[A-Z\\\^\[\]_?]/ &&
3569 $first =~ s/([\$@])\^$/${1}{^}/) # "${^}W" etc
3570 || ($last =~ /^[{\[\w_]/ &&
3571 $first =~ s/([\$@])([A-Za-z_]\w*)$/${1}{$2}/);
3572
a0e66df8 3573 return $first . $last;
3f872cb9 3574 } elsif ($type eq "uc") {
a9760014 3575 return '\U' . $self->re_dq($op->first->sibling, $extended) . '\E';
3f872cb9 3576 } elsif ($type eq "lc") {
a9760014 3577 return '\L' . $self->re_dq($op->first->sibling, $extended) . '\E';
3f872cb9 3578 } elsif ($type eq "ucfirst") {
a9760014 3579 return '\u' . $self->re_dq($op->first->sibling, $extended);
3f872cb9 3580 } elsif ($type eq "lcfirst") {
a9760014 3581 return '\l' . $self->re_dq($op->first->sibling, $extended);
3f872cb9 3582 } elsif ($type eq "quotemeta") {
a9760014 3583 return '\Q' . $self->re_dq($op->first->sibling, $extended) . '\E';
3f872cb9 3584 } elsif ($type eq "join") {
9d2c6865 3585 return $self->deparse($op->last, 26); # was join($", @ary)
6e90668e 3586 } else {
9d2c6865 3587 return $self->deparse($op, 26);
6e90668e
SM
3588 }
3589}
3590
a9760014
RH
3591sub pure_string {
3592 my ($self, $op) = @_;
3593 my $type = $op->name;
3594
3595 if ($type eq 'const') {
3596 return 1;
3597 }
3598 elsif ($type =~ /^[ul]c(first)?$/ || $type eq 'quotemeta') {
3599 return $self->pure_string($op->first->sibling);
3600 }
3601 elsif ($type eq 'join') {
3602 my $join_op = $op->first->sibling; # Skip pushmark
3603 return 0 unless $join_op->name eq 'null' && $join_op->targ eq OP_RV2SV;
3604
3605 my $gvop = $join_op->first;
3606 return 0 unless $gvop->name eq 'gvsv';
3607 return 0 unless '"' eq $self->gv_name($self->gv_or_padgv($gvop));
3608
3609 return 0 unless ${$join_op->sibling} eq ${$op->last};
3610 return 0 unless $op->last->name =~ /^(rv2|pad)av$/;
3611 }
3612 elsif ($type eq 'concat') {
3613 return $self->pure_string($op->first)
3614 && $self->pure_string($op->last);
3615 }
3616 elsif (is_scalar($op) || $type =~ /^[ah]elem(fast)?$/) {
3617 return 1;
3618 }
3619 else {
3620 return 0;
3621 }
3622
3623 return 1;
3624}
3625
3626sub regcomp {
6e90668e 3627 my $self = shift;
a9760014 3628 my($op, $cx, $extended) = @_;
6e90668e 3629 my $kid = $op->first;
3f872cb9
GS
3630 $kid = $kid->first if $kid->name eq "regcmaybe";
3631 $kid = $kid->first if $kid->name eq "regcreset";
a9760014
RH
3632 return ($self->re_dq($kid, $extended), 1) if $self->pure_string($kid);
3633 return ($self->deparse($kid, $cx), 0);
3634}