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Re: Slight chokage from Deparse
[perl5.git] / ext / B / B / Deparse.pm
CommitLineData
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;
ff97752d 10use Carp;
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
ff97752d 955 carp "unexpected OP_ENTER";
9d2c6865
SM
956 return "XXX";
957}
958
959sub pp_pushmark { # see also list
ff97752d 960 carp "unexpected OP_PUSHMARK";
9d2c6865
SM
961 return "XXX";
962}
963
964sub pp_leavesub { # see also deparse_sub
ff97752d 965 carp "unexpected OP_LEAVESUB";
9d2c6865
SM
966 return "XXX";
967}
968
969sub pp_leavewrite { # see also deparse_format
ff97752d 970 carp "unexpected OP_LEAVEWRITE";
9d2c6865
SM
971 return "XXX";
972}
973
974sub pp_method { # see also entersub
ff97752d 975 carp "unexpected OP_METHOD";
9d2c6865
SM
976 return "XXX";
977}
978
979sub pp_regcmaybe { # see also regcomp
ff97752d 980 carp "unexpected OP_REGCMAYBE";
9d2c6865
SM
981 return "XXX";
982}
983
90be192f 984sub pp_regcreset { # see also regcomp
ff97752d 985 carp "unexpected OP_REGCRESET";
90be192f
SM
986 return "XXX";
987}
988
9d2c6865 989sub pp_substcont { # see also subst
ff97752d 990 carp "unexpected OP_SUBSTCONT";
9d2c6865
SM
991 return "XXX";
992}
993
994sub pp_grepstart { # see also grepwhile
ff97752d 995 carp "unexpected OP_GREPSTART";
9d2c6865
SM
996 return "XXX";
997}
998
999sub pp_mapstart { # see also mapwhile
ff97752d 1000 carp "unexpected OP_MAPSTART";
9d2c6865
SM
1001 return "XXX";
1002}
1003
90c0eb26 1004sub pp_method_named {
ff97752d 1005 carp "unexpected OP_METHOD_NAMED";
90c0eb26
RH
1006 return "XXX";
1007}
1008
9d2c6865 1009sub pp_flip { # see also flop
ff97752d 1010 carp "unexpected OP_FLIP";
9d2c6865
SM
1011 return "XXX";
1012}
1013
1014sub pp_iter { # see also leaveloop
ff97752d 1015 carp "unexpected OP_ITER";
9d2c6865
SM
1016 return "XXX";
1017}
1018
1019sub pp_enteriter { # see also leaveloop
ff97752d 1020 carp "unexpected OP_ENTERITER";
9d2c6865
SM
1021 return "XXX";
1022}
1023
1024sub pp_enterloop { # see also leaveloop
ff97752d 1025 carp "unexpected OP_ENTERLOOP";
9d2c6865
SM
1026 return "XXX";
1027}
1028
1029sub pp_leaveeval { # see also entereval
ff97752d 1030 carp "unexpected OP_LEAVEEVAL";
9d2c6865
SM
1031 return "XXX";
1032}
1033
1034sub pp_entertry { # see also leavetry
ff97752d 1035 carp "unexpected OP_ENTERTRY";
9d2c6865
SM
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) = @_;
ff97752d 1222 carp("Undefined op in find_scope") if !defined $op;
ce4e655d
RH
1223 return ($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 $targ = shift;
1623 return (($self->{'curcv'}->PADLIST->ARRAY)[1]->ARRAY)[$targ];
1624}
1625
1626sub pp_refgen {
1627 my $self = shift;
9d2c6865 1628 my($op, $cx) = @_;
6e90668e 1629 my $kid = $op->first;
3f872cb9 1630 if ($kid->name eq "null") {
6e90668e 1631 $kid = $kid->first;
3f872cb9
GS
1632 if ($kid->name eq "anonlist" || $kid->name eq "anonhash") {
1633 my($pre, $post) = @{{"anonlist" => ["[","]"],
1634 "anonhash" => ["{","}"]}->{$kid->name}};
6e90668e
SM
1635 my($expr, @exprs);
1636 $kid = $kid->first->sibling; # skip pushmark
1637 for (; !null($kid); $kid = $kid->sibling) {
9d2c6865 1638 $expr = $self->deparse($kid, 6);
6e90668e
SM
1639 push @exprs, $expr;
1640 }
1641 return $pre . join(", ", @exprs) . $post;
1642 } elsif (!null($kid->sibling) and
3f872cb9 1643 $kid->sibling->name eq "anoncode") {
6e90668e
SM
1644 return "sub " .
1645 $self->deparse_sub($self->padval($kid->sibling->targ));
3f872cb9
GS
1646 } elsif ($kid->name eq "pushmark") {
1647 my $sib_name = $kid->sibling->name;
1648 if ($sib_name =~ /^(pad|rv2)[ah]v$/
c8c62db7
AD
1649 and not $kid->sibling->flags & OPf_REF)
1650 {
1651 # The @a in \(@a) isn't in ref context, but only when the
1652 # parens are there.
1653 return "\\(" . $self->deparse($kid->sibling, 1) . ")";
3f872cb9 1654 } elsif ($sib_name eq 'entersub') {
c8c62db7
AD
1655 my $text = $self->deparse($kid->sibling, 1);
1656 # Always show parens for \(&func()), but only with -p otherwise
1657 $text = "($text)" if $self->{'parens'}
1658 or $kid->sibling->private & OPpENTERSUB_AMPER;
1659 return "\\$text";
1660 }
1661 }
6e90668e 1662 }
9d2c6865 1663 $self->pfixop($op, $cx, "\\", 20);
6e90668e
SM
1664}
1665
1666sub pp_srefgen { pp_refgen(@_) }
1667
1668sub pp_readline {
1669 my $self = shift;
9d2c6865 1670 my($op, $cx) = @_;
6e90668e 1671 my $kid = $op->first;
3f872cb9 1672 $kid = $kid->first if $kid->name eq "rv2gv"; # <$fh>
e31885a0
RH
1673 return "<" . $self->deparse($kid, 1) . ">" if is_scalar($kid);
1674 return $self->unop($op, $cx, "readline");
6e90668e
SM
1675}
1676
ad8caead
RGS
1677sub pp_rcatline {
1678 my $self = shift;
1679 my($op) = @_;
1680 return "<" . $self->gv_name($op->gv) . ">";
1681}
1682
bd0865ec
GS
1683# Unary operators that can occur as pseudo-listops inside double quotes
1684sub dq_unop {
1685 my $self = shift;
1686 my($op, $cx, $name, $prec, $flags) = (@_, 0, 0);
1687 my $kid;
1688 if ($op->flags & OPf_KIDS) {
1689 $kid = $op->first;
1690 # If there's more than one kid, the first is an ex-pushmark.
1691 $kid = $kid->sibling if not null $kid->sibling;
1692 return $self->maybe_parens_unop($name, $kid, $cx);
1693 } else {
1694 return $name . ($op->flags & OPf_SPECIAL ? "()" : "");
1695 }
1696}
1697
1698sub pp_ucfirst { dq_unop(@_, "ucfirst") }
1699sub pp_lcfirst { dq_unop(@_, "lcfirst") }
1700sub pp_uc { dq_unop(@_, "uc") }
1701sub pp_lc { dq_unop(@_, "lc") }
3ed82cfc 1702sub pp_quotemeta { maybe_targmy(@_, \&dq_unop, "quotemeta") }
bd0865ec 1703
6e90668e
SM
1704sub loopex {
1705 my $self = shift;
9d2c6865 1706 my ($op, $cx, $name) = @_;
6e90668e 1707 if (class($op) eq "PVOP") {
9d2c6865
SM
1708 return "$name " . $op->pv;
1709 } elsif (class($op) eq "OP") {
1710 return $name;
6e90668e 1711 } elsif (class($op) eq "UNOP") {
9d2c6865
SM
1712 # Note -- loop exits are actually exempt from the
1713 # looks-like-a-func rule, but a few extra parens won't hurt
1714 return $self->maybe_parens_unop($name, $op->first, $cx);
6e90668e 1715 }
6e90668e
SM
1716}
1717
1718sub pp_last { loopex(@_, "last") }
1719sub pp_next { loopex(@_, "next") }
1720sub pp_redo { loopex(@_, "redo") }
1721sub pp_goto { loopex(@_, "goto") }
1722sub pp_dump { loopex(@_, "dump") }
1723
1724sub ftst {
1725 my $self = shift;
9d2c6865 1726 my($op, $cx, $name) = @_;
6e90668e 1727 if (class($op) eq "UNOP") {
9d2c6865
SM
1728 # Genuine `-X' filetests are exempt from the LLAFR, but not
1729 # l?stat(); for the sake of clarity, give'em all parens
1730 return $self->maybe_parens_unop($name, $op->first, $cx);
7934575e 1731 } elsif (class($op) eq "SVOP") {
9d2c6865 1732 return $self->maybe_parens_func($name, $self->pp_gv($op, 1), $cx, 16);
6e90668e 1733 } else { # I don't think baseop filetests ever survive ck_ftst, but...
9d2c6865 1734 return $name;
6e90668e 1735 }
6e90668e
SM
1736}
1737
1738sub pp_lstat { ftst(@_, "lstat") }
1739sub pp_stat { ftst(@_, "stat") }
1740sub pp_ftrread { ftst(@_, "-R") }
1741sub pp_ftrwrite { ftst(@_, "-W") }
1742sub pp_ftrexec { ftst(@_, "-X") }
1743sub pp_fteread { ftst(@_, "-r") }
e31885a0
RH
1744sub pp_ftewrite { ftst(@_, "-w") }
1745sub pp_fteexec { ftst(@_, "-x") }
6e90668e
SM
1746sub pp_ftis { ftst(@_, "-e") }
1747sub pp_fteowned { ftst(@_, "-O") }
1748sub pp_ftrowned { ftst(@_, "-o") }
1749sub pp_ftzero { ftst(@_, "-z") }
1750sub pp_ftsize { ftst(@_, "-s") }
1751sub pp_ftmtime { ftst(@_, "-M") }
1752sub pp_ftatime { ftst(@_, "-A") }
1753sub pp_ftctime { ftst(@_, "-C") }
1754sub pp_ftsock { ftst(@_, "-S") }
1755sub pp_ftchr { ftst(@_, "-c") }
1756sub pp_ftblk { ftst(@_, "-b") }
1757sub pp_ftfile { ftst(@_, "-f") }
1758sub pp_ftdir { ftst(@_, "-d") }
1759sub pp_ftpipe { ftst(@_, "-p") }
1760sub pp_ftlink { ftst(@_, "-l") }
1761sub pp_ftsuid { ftst(@_, "-u") }
1762sub pp_ftsgid { ftst(@_, "-g") }
1763sub pp_ftsvtx { ftst(@_, "-k") }
1764sub pp_fttty { ftst(@_, "-t") }
1765sub pp_fttext { ftst(@_, "-T") }
1766sub pp_ftbinary { ftst(@_, "-B") }
1767
a798dbf2 1768sub SWAP_CHILDREN () { 1 }
6e90668e 1769sub ASSIGN () { 2 } # has OP= variant
7013e6ae 1770sub LIST_CONTEXT () { 4 } # Assignment is in list context
6e90668e 1771
9d2c6865
SM
1772my(%left, %right);
1773
1774sub assoc_class {
1775 my $op = shift;
3f872cb9
GS
1776 my $name = $op->name;
1777 if ($name eq "concat" and $op->first->name eq "concat") {
9d2c6865 1778 # avoid spurious `=' -- see comment in pp_concat
3f872cb9 1779 return "concat";
9d2c6865 1780 }
3f872cb9
GS
1781 if ($name eq "null" and class($op) eq "UNOP"
1782 and $op->first->name =~ /^(and|x?or)$/
9d2c6865
SM
1783 and null $op->first->sibling)
1784 {
1785 # Like all conditional constructs, OP_ANDs and OP_ORs are topped
1786 # with a null that's used as the common end point of the two
1787 # flows of control. For precedence purposes, ignore it.
1788 # (COND_EXPRs have these too, but we don't bother with
1789 # their associativity).
1790 return assoc_class($op->first);
1791 }
1792 return $name . ($op->flags & OPf_STACKED ? "=" : "");
1793}
1794
1795# Left associative operators, like `+', for which
1796# $a + $b + $c is equivalent to ($a + $b) + $c
1797
1798BEGIN {
3f872cb9
GS
1799 %left = ('multiply' => 19, 'i_multiply' => 19,
1800 'divide' => 19, 'i_divide' => 19,
1801 'modulo' => 19, 'i_modulo' => 19,
1802 'repeat' => 19,
1803 'add' => 18, 'i_add' => 18,
1804 'subtract' => 18, 'i_subtract' => 18,
1805 'concat' => 18,
1806 'left_shift' => 17, 'right_shift' => 17,
1807 'bit_and' => 13,
1808 'bit_or' => 12, 'bit_xor' => 12,
1809 'and' => 3,
1810 'or' => 2, 'xor' => 2,
9d2c6865
SM
1811 );
1812}
1813
1814sub deparse_binop_left {
1815 my $self = shift;
1816 my($op, $left, $prec) = @_;
58231d39 1817 if ($left{assoc_class($op)} && $left{assoc_class($left)}
9d2c6865
SM
1818 and $left{assoc_class($op)} == $left{assoc_class($left)})
1819 {
1820 return $self->deparse($left, $prec - .00001);
1821 } else {
1822 return $self->deparse($left, $prec);
1823 }
1824}
1825
1826# Right associative operators, like `=', for which
1827# $a = $b = $c is equivalent to $a = ($b = $c)
1828
1829BEGIN {
3f872cb9
GS
1830 %right = ('pow' => 22,
1831 'sassign=' => 7, 'aassign=' => 7,
1832 'multiply=' => 7, 'i_multiply=' => 7,
1833 'divide=' => 7, 'i_divide=' => 7,
1834 'modulo=' => 7, 'i_modulo=' => 7,
1835 'repeat=' => 7,
1836 'add=' => 7, 'i_add=' => 7,
1837 'subtract=' => 7, 'i_subtract=' => 7,
1838 'concat=' => 7,
1839 'left_shift=' => 7, 'right_shift=' => 7,
1840 'bit_and=' => 7,
1841 'bit_or=' => 7, 'bit_xor=' => 7,
1842 'andassign' => 7,
1843 'orassign' => 7,
9d2c6865
SM
1844 );
1845}
1846
1847sub deparse_binop_right {
1848 my $self = shift;
1849 my($op, $right, $prec) = @_;
58231d39 1850 if ($right{assoc_class($op)} && $right{assoc_class($right)}
9d2c6865
SM
1851 and $right{assoc_class($op)} == $right{assoc_class($right)})
1852 {
1853 return $self->deparse($right, $prec - .00001);
1854 } else {
1855 return $self->deparse($right, $prec);
1856 }
1857}
1858
a798dbf2 1859sub binop {
6e90668e 1860 my $self = shift;
9d2c6865 1861 my ($op, $cx, $opname, $prec, $flags) = (@_, 0);
a798dbf2
MB
1862 my $left = $op->first;
1863 my $right = $op->last;
9d2c6865
SM
1864 my $eq = "";
1865 if ($op->flags & OPf_STACKED && $flags & ASSIGN) {
1866 $eq = "=";
1867 $prec = 7;
1868 }
a798dbf2
MB
1869 if ($flags & SWAP_CHILDREN) {
1870 ($left, $right) = ($right, $left);
1871 }
9d2c6865 1872 $left = $self->deparse_binop_left($op, $left, $prec);
90c0eb26
RH
1873 $left = "($left)" if $flags & LIST_CONTEXT
1874 && $left !~ /^(my|our|local|)[\@\(]/;
9d2c6865
SM
1875 $right = $self->deparse_binop_right($op, $right, $prec);
1876 return $self->maybe_parens("$left $opname$eq $right", $cx, $prec);
1877}
1878
3ed82cfc
GS
1879sub pp_add { maybe_targmy(@_, \&binop, "+", 18, ASSIGN) }
1880sub pp_multiply { maybe_targmy(@_, \&binop, "*", 19, ASSIGN) }
1881sub pp_subtract { maybe_targmy(@_, \&binop, "-",18, ASSIGN) }
1882sub pp_divide { maybe_targmy(@_, \&binop, "/", 19, ASSIGN) }
1883sub pp_modulo { maybe_targmy(@_, \&binop, "%", 19, ASSIGN) }
1884sub pp_i_add { maybe_targmy(@_, \&binop, "+", 18, ASSIGN) }
1885sub pp_i_multiply { maybe_targmy(@_, \&binop, "*", 19, ASSIGN) }
1886sub pp_i_subtract { maybe_targmy(@_, \&binop, "-", 18, ASSIGN) }
1887sub pp_i_divide { maybe_targmy(@_, \&binop, "/", 19, ASSIGN) }
1888sub pp_i_modulo { maybe_targmy(@_, \&binop, "%", 19, ASSIGN) }
1889sub pp_pow { maybe_targmy(@_, \&binop, "**", 22, ASSIGN) }
1890
1891sub pp_left_shift { maybe_targmy(@_, \&binop, "<<", 17, ASSIGN) }
1892sub pp_right_shift { maybe_targmy(@_, \&binop, ">>", 17, ASSIGN) }
1893sub pp_bit_and { maybe_targmy(@_, \&binop, "&", 13, ASSIGN) }
1894sub pp_bit_or { maybe_targmy(@_, \&binop, "|", 12, ASSIGN) }
1895sub pp_bit_xor { maybe_targmy(@_, \&binop, "^", 12, ASSIGN) }
9d2c6865
SM
1896
1897sub pp_eq { binop(@_, "==", 14) }
1898sub pp_ne { binop(@_, "!=", 14) }
1899sub pp_lt { binop(@_, "<", 15) }
1900sub pp_gt { binop(@_, ">", 15) }
1901sub pp_ge { binop(@_, ">=", 15) }
1902sub pp_le { binop(@_, "<=", 15) }
1903sub pp_ncmp { binop(@_, "<=>", 14) }
1904sub pp_i_eq { binop(@_, "==", 14) }
1905sub pp_i_ne { binop(@_, "!=", 14) }
1906sub pp_i_lt { binop(@_, "<", 15) }
1907sub pp_i_gt { binop(@_, ">", 15) }
1908sub pp_i_ge { binop(@_, ">=", 15) }
1909sub pp_i_le { binop(@_, "<=", 15) }
1910sub pp_i_ncmp { binop(@_, "<=>", 14) }
1911
1912sub pp_seq { binop(@_, "eq", 14) }
1913sub pp_sne { binop(@_, "ne", 14) }
1914sub pp_slt { binop(@_, "lt", 15) }
1915sub pp_sgt { binop(@_, "gt", 15) }
1916sub pp_sge { binop(@_, "ge", 15) }
1917sub pp_sle { binop(@_, "le", 15) }
1918sub pp_scmp { binop(@_, "cmp", 14) }
1919
1920sub pp_sassign { binop(@_, "=", 7, SWAP_CHILDREN) }
7013e6ae 1921sub pp_aassign { binop(@_, "=", 7, SWAP_CHILDREN | LIST_CONTEXT) }
6e90668e
SM
1922
1923# `.' is special because concats-of-concats are optimized to save copying
1924# by making all but the first concat stacked. The effect is as if the
1925# programmer had written `($a . $b) .= $c', except legal.
3ed82cfc
GS
1926sub pp_concat { maybe_targmy(@_, \&real_concat) }
1927sub real_concat {
6e90668e 1928 my $self = shift;
9d2c6865 1929 my($op, $cx) = @_;
6e90668e
SM
1930 my $left = $op->first;
1931 my $right = $op->last;
1932 my $eq = "";
9d2c6865 1933 my $prec = 18;
3f872cb9 1934 if ($op->flags & OPf_STACKED and $op->first->name ne "concat") {
6e90668e 1935 $eq = "=";
9d2c6865 1936 $prec = 7;
6e90668e 1937 }
9d2c6865
SM
1938 $left = $self->deparse_binop_left($op, $left, $prec);
1939 $right = $self->deparse_binop_right($op, $right, $prec);
1940 return $self->maybe_parens("$left .$eq $right", $cx, $prec);
6e90668e
SM
1941}
1942
1943# `x' is weird when the left arg is a list
1944sub pp_repeat {
1945 my $self = shift;
9d2c6865 1946 my($op, $cx) = @_;
6e90668e
SM
1947 my $left = $op->first;
1948 my $right = $op->last;
9d2c6865
SM
1949 my $eq = "";
1950 my $prec = 19;
1951 if ($op->flags & OPf_STACKED) {
1952 $eq = "=";
1953 $prec = 7;
1954 }
6e90668e
SM
1955 if (null($right)) { # list repeat; count is inside left-side ex-list
1956 my $kid = $left->first->sibling; # skip pushmark
1957 my @exprs;
1958 for (; !null($kid->sibling); $kid = $kid->sibling) {
9d2c6865 1959 push @exprs, $self->deparse($kid, 6);
6e90668e
SM
1960 }
1961 $right = $kid;
1962 $left = "(" . join(", ", @exprs). ")";
1963 } else {
9d2c6865 1964 $left = $self->deparse_binop_left($op, $left, $prec);
6e90668e 1965 }
9d2c6865
SM
1966 $right = $self->deparse_binop_right($op, $right, $prec);
1967 return $self->maybe_parens("$left x$eq $right", $cx, $prec);
6e90668e
SM
1968}
1969
1970sub range {
1971 my $self = shift;
9d2c6865 1972 my ($op, $cx, $type) = @_;
6e90668e
SM
1973 my $left = $op->first;
1974 my $right = $left->sibling;
9d2c6865
SM
1975 $left = $self->deparse($left, 9);
1976 $right = $self->deparse($right, 9);
1977 return $self->maybe_parens("$left $type $right", $cx, 9);
6e90668e
SM
1978}
1979
1980sub pp_flop {
1981 my $self = shift;
9d2c6865 1982 my($op, $cx) = @_;
6e90668e
SM
1983 my $flip = $op->first;
1984 my $type = ($flip->flags & OPf_SPECIAL) ? "..." : "..";
9d2c6865 1985 return $self->range($flip->first, $cx, $type);
6e90668e
SM
1986}
1987
1988# one-line while/until is handled in pp_leave
1989
1990sub logop {
1991 my $self = shift;
9d2c6865 1992 my ($op, $cx, $lowop, $lowprec, $highop, $highprec, $blockname) = @_;
6e90668e
SM
1993 my $left = $op->first;
1994 my $right = $op->first->sibling;
58cccf98
SM
1995 if ($cx == 0 and is_scope($right) and $blockname
1996 and $self->{'expand'} < 7)
1997 { # if ($a) {$b}
9d2c6865
SM
1998 $left = $self->deparse($left, 1);
1999 $right = $self->deparse($right, 0);
2000 return "$blockname ($left) {\n\t$right\n\b}\cK";
58cccf98
SM
2001 } elsif ($cx == 0 and $blockname and not $self->{'parens'}
2002 and $self->{'expand'} < 7) { # $b if $a
9d2c6865
SM
2003 $right = $self->deparse($right, 1);
2004 $left = $self->deparse($left, 1);
2005 return "$right $blockname $left";
2006 } elsif ($cx > $lowprec and $highop) { # $a && $b
2007 $left = $self->deparse_binop_left($op, $left, $highprec);
2008 $right = $self->deparse_binop_right($op, $right, $highprec);
2009 return $self->maybe_parens("$left $highop $right", $cx, $highprec);
2010 } else { # $a and $b
2011 $left = $self->deparse_binop_left($op, $left, $lowprec);
2012 $right = $self->deparse_binop_right($op, $right, $lowprec);
2013 return $self->maybe_parens("$left $lowop $right", $cx, $lowprec);
2014 }
2015}
2016
2017sub pp_and { logop(@_, "and", 3, "&&", 11, "if") }
f4a44678 2018sub pp_or { logop(@_, "or", 2, "||", 10, "unless") }
3ed82cfc
GS
2019
2020# xor is syntactically a logop, but it's really a binop (contrary to
2021# old versions of opcode.pl). Syntax is what matters here.
9d2c6865 2022sub pp_xor { logop(@_, "xor", 2, "", 0, "") }
6e90668e
SM
2023
2024sub logassignop {
2025 my $self = shift;
9d2c6865 2026 my ($op, $cx, $opname) = @_;
6e90668e
SM
2027 my $left = $op->first;
2028 my $right = $op->first->sibling->first; # skip sassign
9d2c6865
SM
2029 $left = $self->deparse($left, 7);
2030 $right = $self->deparse($right, 7);
2031 return $self->maybe_parens("$left $opname $right", $cx, 7);
a798dbf2
MB
2032}
2033
6e90668e
SM
2034sub pp_andassign { logassignop(@_, "&&=") }
2035sub pp_orassign { logassignop(@_, "||=") }
2036
2037sub listop {
2038 my $self = shift;
9d2c6865
SM
2039 my($op, $cx, $name) = @_;
2040 my(@exprs);
2041 my $parens = ($cx >= 5) || $self->{'parens'};
2042 my $kid = $op->first->sibling;
2043 return $name if null $kid;
e31885a0
RH
2044 my $first;
2045 if (defined prototype("CORE::$name")
2046 && prototype("CORE::$name") =~ /^;?\*/
2047 && $kid->name eq "rv2gv") {
2048 $first = $self->deparse($kid->first, 6);
2049 }
2050 else {
2051 $first = $self->deparse($kid, 6);
2052 }
e99ebc55 2053 if ($name eq "chmod" && $first =~ /^\d+$/) {
a0035eb8 2054 $first = sprintf("%#o", $first);
e99ebc55 2055 }
9d2c6865
SM
2056 $first = "+$first" if not $parens and substr($first, 0, 1) eq "(";
2057 push @exprs, $first;
2058 $kid = $kid->sibling;
2059 for (; !null($kid); $kid = $kid->sibling) {
2060 push @exprs, $self->deparse($kid, 6);
2061 }
2062 if ($parens) {
2063 return "$name(" . join(", ", @exprs) . ")";
2064 } else {
2065 return "$name " . join(", ", @exprs);
6e90668e 2066 }
6e90668e 2067}
a798dbf2 2068
6e90668e 2069sub pp_bless { listop(@_, "bless") }
3ed82cfc 2070sub pp_atan2 { maybe_targmy(@_, \&listop, "atan2") }
6e90668e
SM
2071sub pp_substr { maybe_local(@_, listop(@_, "substr")) }
2072sub pp_vec { maybe_local(@_, listop(@_, "vec")) }
3ed82cfc
GS
2073sub pp_index { maybe_targmy(@_, \&listop, "index") }
2074sub pp_rindex { maybe_targmy(@_, \&listop, "rindex") }
2075sub pp_sprintf { maybe_targmy(@_, \&listop, "sprintf") }
6e90668e 2076sub pp_formline { listop(@_, "formline") } # see also deparse_format
3ed82cfc 2077sub pp_crypt { maybe_targmy(@_, \&listop, "crypt") }
6e90668e
SM
2078sub pp_unpack { listop(@_, "unpack") }
2079sub pp_pack { listop(@_, "pack") }
3ed82cfc 2080sub pp_join { maybe_targmy(@_, \&listop, "join") }
6e90668e 2081sub pp_splice { listop(@_, "splice") }
3ed82cfc
GS
2082sub pp_push { maybe_targmy(@_, \&listop, "push") }
2083sub pp_unshift { maybe_targmy(@_, \&listop, "unshift") }
6e90668e
SM
2084sub pp_reverse { listop(@_, "reverse") }
2085sub pp_warn { listop(@_, "warn") }
2086sub pp_die { listop(@_, "die") }
9d2c6865
SM
2087# Actually, return is exempt from the LLAFR (see examples in this very
2088# module!), but for consistency's sake, ignore that fact
6e90668e
SM
2089sub pp_return { listop(@_, "return") }
2090sub pp_open { listop(@_, "open") }
2091sub pp_pipe_op { listop(@_, "pipe") }
2092sub pp_tie { listop(@_, "tie") }
82bafd27 2093sub pp_binmode { listop(@_, "binmode") }
6e90668e
SM
2094sub pp_dbmopen { listop(@_, "dbmopen") }
2095sub pp_sselect { listop(@_, "select") }
2096sub pp_select { listop(@_, "select") }
2097sub pp_read { listop(@_, "read") }
2098sub pp_sysopen { listop(@_, "sysopen") }
2099sub pp_sysseek { listop(@_, "sysseek") }
2100sub pp_sysread { listop(@_, "sysread") }
2101sub pp_syswrite { listop(@_, "syswrite") }
2102sub pp_send { listop(@_, "send") }
2103sub pp_recv { listop(@_, "recv") }
2104sub pp_seek { listop(@_, "seek") }
6e90668e
SM
2105sub pp_fcntl { listop(@_, "fcntl") }
2106sub pp_ioctl { listop(@_, "ioctl") }
3ed82cfc 2107sub pp_flock { maybe_targmy(@_, \&listop, "flock") }
6e90668e
SM
2108sub pp_socket { listop(@_, "socket") }
2109sub pp_sockpair { listop(@_, "sockpair") }
2110sub pp_bind { listop(@_, "bind") }
2111sub pp_connect { listop(@_, "connect") }
2112sub pp_listen { listop(@_, "listen") }
2113sub pp_accept { listop(@_, "accept") }
2114sub pp_shutdown { listop(@_, "shutdown") }
2115sub pp_gsockopt { listop(@_, "getsockopt") }
2116sub pp_ssockopt { listop(@_, "setsockopt") }
3ed82cfc
GS
2117sub pp_chown { maybe_targmy(@_, \&listop, "chown") }
2118sub pp_unlink { maybe_targmy(@_, \&listop, "unlink") }
2119sub pp_chmod { maybe_targmy(@_, \&listop, "chmod") }
2120sub pp_utime { maybe_targmy(@_, \&listop, "utime") }
2121sub pp_rename { maybe_targmy(@_, \&listop, "rename") }
2122sub pp_link { maybe_targmy(@_, \&listop, "link") }
2123sub pp_symlink { maybe_targmy(@_, \&listop, "symlink") }
2124sub pp_mkdir { maybe_targmy(@_, \&listop, "mkdir") }
6e90668e
SM
2125sub pp_open_dir { listop(@_, "opendir") }
2126sub pp_seekdir { listop(@_, "seekdir") }
3ed82cfc
GS
2127sub pp_waitpid { maybe_targmy(@_, \&listop, "waitpid") }
2128sub pp_system { maybe_targmy(@_, \&listop, "system") }
2129sub pp_exec { maybe_targmy(@_, \&listop, "exec") }
2130sub pp_kill { maybe_targmy(@_, \&listop, "kill") }
2131sub pp_setpgrp { maybe_targmy(@_, \&listop, "setpgrp") }
2132sub pp_getpriority { maybe_targmy(@_, \&listop, "getpriority") }
2133sub pp_setpriority { maybe_targmy(@_, \&listop, "setpriority") }
6e90668e
SM
2134sub pp_shmget { listop(@_, "shmget") }
2135sub pp_shmctl { listop(@_, "shmctl") }
2136sub pp_shmread { listop(@_, "shmread") }
2137sub pp_shmwrite { listop(@_, "shmwrite") }
2138sub pp_msgget { listop(@_, "msgget") }
2139sub pp_msgctl { listop(@_, "msgctl") }
2140sub pp_msgsnd { listop(@_, "msgsnd") }
2141sub pp_msgrcv { listop(@_, "msgrcv") }
2142sub pp_semget { listop(@_, "semget") }
2143sub pp_semctl { listop(@_, "semctl") }
2144sub pp_semop { listop(@_, "semop") }
2145sub pp_ghbyaddr { listop(@_, "gethostbyaddr") }
2146sub pp_gnbyaddr { listop(@_, "getnetbyaddr") }
2147sub pp_gpbynumber { listop(@_, "getprotobynumber") }
2148sub pp_gsbyname { listop(@_, "getservbyname") }
2149sub pp_gsbyport { listop(@_, "getservbyport") }
2150sub pp_syscall { listop(@_, "syscall") }
2151
2152sub pp_glob {
2153 my $self = shift;
9d2c6865 2154 my($op, $cx) = @_;
6e90668e
SM
2155 my $text = $self->dq($op->first->sibling); # skip pushmark
2156 if ($text =~ /^\$?(\w|::|\`)+$/ # could look like a readline
2157 or $text =~ /[<>]/) {
2158 return 'glob(' . single_delim('qq', '"', $text) . ')';
2159 } else {
2160 return '<' . $text . '>';
2161 }
2162}
2163
f5aa8f4e
SM
2164# Truncate is special because OPf_SPECIAL makes a bareword first arg
2165# be a filehandle. This could probably be better fixed in the core
2166# by moving the GV lookup into ck_truc.
2167
2168sub pp_truncate {
2169 my $self = shift;
2170 my($op, $cx) = @_;
2171 my(@exprs);
2172 my $parens = ($cx >= 5) || $self->{'parens'};
2173 my $kid = $op->first->sibling;
acba1d67 2174 my $fh;
f5aa8f4e
SM
2175 if ($op->flags & OPf_SPECIAL) {
2176 # $kid is an OP_CONST
18228111 2177 $fh = $self->const_sv($kid)->PV;
f5aa8f4e
SM
2178 } else {
2179 $fh = $self->deparse($kid, 6);
2180 $fh = "+$fh" if not $parens and substr($fh, 0, 1) eq "(";
2181 }
2182 my $len = $self->deparse($kid->sibling, 6);
2183 if ($parens) {
2184 return "truncate($fh, $len)";
2185 } else {
2186 return "truncate $fh, $len";
2187 }
f5aa8f4e
SM
2188}
2189
6e90668e
SM
2190sub indirop {
2191 my $self = shift;
9d2c6865 2192 my($op, $cx, $name) = @_;
6e90668e
SM
2193 my($expr, @exprs);
2194 my $kid = $op->first->sibling;
2195 my $indir = "";
2196 if ($op->flags & OPf_STACKED) {
2197 $indir = $kid;
2198 $indir = $indir->first; # skip rv2gv
2199 if (is_scope($indir)) {
9d2c6865 2200 $indir = "{" . $self->deparse($indir, 0) . "}";
c73811ab
RH
2201 } elsif ($indir->name eq "const" && $indir->private & OPpCONST_BARE) {
2202 $indir = $self->const_sv($indir)->PV;
6e90668e 2203 } else {
9d2c6865 2204 $indir = $self->deparse($indir, 24);
6e90668e
SM
2205 }
2206 $indir = $indir . " ";
2207 $kid = $kid->sibling;
2208 }
7e80da18
RH
2209 if ($name eq "sort" && $op->private & (OPpSORT_NUMERIC | OPpSORT_INTEGER)) {
2210 $indir = ($op->private & OPpSORT_REVERSE) ? '{$b <=> $a} '
2211 : '{$a <=> $b} ';
2212 }
2213 elsif ($name eq "sort" && $op->private & OPpSORT_REVERSE) {
2214 $indir = '{$b cmp $a} ';
2215 }
6e90668e 2216 for (; !null($kid); $kid = $kid->sibling) {
9d2c6865 2217 $expr = $self->deparse($kid, 6);
6e90668e
SM
2218 push @exprs, $expr;
2219 }
3ed82cfc 2220 return $self->maybe_parens_func($name, $indir . join(", ", @exprs),
9d2c6865 2221 $cx, 5);
6e90668e
SM
2222}
2223
2224sub pp_prtf { indirop(@_, "printf") }
2225sub pp_print { indirop(@_, "print") }
2226sub pp_sort { indirop(@_, "sort") }
2227
2228sub mapop {
2229 my $self = shift;
9d2c6865 2230 my($op, $cx, $name) = @_;
6e90668e
SM
2231 my($expr, @exprs);
2232 my $kid = $op->first; # this is the (map|grep)start
2233 $kid = $kid->first->sibling; # skip a pushmark
2234 my $code = $kid->first; # skip a null
2235 if (is_scope $code) {
f4a44678 2236 $code = "{" . $self->deparse($code, 0) . "} ";
6e90668e 2237 } else {
9d2c6865 2238 $code = $self->deparse($code, 24) . ", ";
6e90668e
SM
2239 }
2240 $kid = $kid->sibling;
2241 for (; !null($kid); $kid = $kid->sibling) {
9d2c6865 2242 $expr = $self->deparse($kid, 6);
6e90668e
SM
2243 push @exprs, $expr if $expr;
2244 }
9d2c6865 2245 return $self->maybe_parens_func($name, $code . join(", ", @exprs), $cx, 5);
6e90668e
SM
2246}
2247
2248sub pp_mapwhile { mapop(@_, "map") }
2249sub pp_grepwhile { mapop(@_, "grep") }
2250
2251sub pp_list {
2252 my $self = shift;
9d2c6865 2253 my($op, $cx) = @_;
6e90668e
SM
2254 my($expr, @exprs);
2255 my $kid = $op->first->sibling; # skip pushmark
2256 my $lop;
ce4e655d 2257 my $local = "either"; # could be local(...), my(...) or our(...)
6e90668e
SM
2258 for ($lop = $kid; !null($lop); $lop = $lop->sibling) {
2259 # This assumes that no other private flags equal 128, and that
2260 # OPs that store things other than flags in their op_private,
2261 # like OP_AELEMFAST, won't be immediate children of a list.
b8e103fc
RH
2262 #
2263 # OP_ENTERSUB can break this logic, so check for it.
2264 # I suspect that open and exit can too.
2265
2266 if (!($lop->private & (OPpLVAL_INTRO|OPpOUR_INTRO)
ce4e655d 2267 or $lop->name eq "undef")
b8e103fc
RH
2268 or $lop->name eq "entersub"
2269 or $lop->name eq "exit"
2270 or $lop->name eq "open")
6e90668e
SM
2271 {
2272 $local = ""; # or not
2273 last;
2274 }
3f872cb9 2275 if ($lop->name =~ /^pad[ash]v$/) { # my()
ce4e655d 2276 ($local = "", last) if $local eq "local" || $local eq "our";
6e90668e 2277 $local = "my";
b8e103fc
RH
2278 } elsif ($lop->name =~ /^(gv|rv2)[ash]v$/
2279 && $lop->private & OPpOUR_INTRO
2280 or $lop->name eq "null" && $lop->first->name eq "gvsv"
2281 && $lop->first->private & OPpOUR_INTRO) { # our()
ce4e655d
RH
2282 ($local = "", last) if $local eq "my" || $local eq "local";
2283 $local = "our";
3f872cb9 2284 } elsif ($lop->name ne "undef") { # local()
ce4e655d 2285 ($local = "", last) if $local eq "my" || $local eq "our";
6e90668e
SM
2286 $local = "local";
2287 }
2288 }
2289 $local = "" if $local eq "either"; # no point if it's all undefs
f5aa8f4e 2290 return $self->deparse($kid, $cx) if null $kid->sibling and not $local;
6e90668e
SM
2291 for (; !null($kid); $kid = $kid->sibling) {
2292 if ($local) {
3f872cb9 2293 if (class($kid) eq "UNOP" and $kid->first->name eq "gvsv") {
6e90668e
SM
2294 $lop = $kid->first;
2295 } else {
2296 $lop = $kid;
2297 }
2298 $self->{'avoid_local'}{$$lop}++;
9d2c6865 2299 $expr = $self->deparse($kid, 6);
6e90668e
SM
2300 delete $self->{'avoid_local'}{$$lop};
2301 } else {
9d2c6865 2302 $expr = $self->deparse($kid, 6);
6e90668e
SM
2303 }
2304 push @exprs, $expr;
2305 }
9d2c6865
SM
2306 if ($local) {
2307 return "$local(" . join(", ", @exprs) . ")";
2308 } else {
2309 return $self->maybe_parens( join(", ", @exprs), $cx, 6);
2310 }
6e90668e
SM
2311}
2312
6f611a1a
GS
2313sub is_ifelse_cont {
2314 my $op = shift;
2315 return ($op->name eq "null" and class($op) eq "UNOP"
2316 and $op->first->name =~ /^(and|cond_expr)$/
2317 and is_scope($op->first->first->sibling));
2318}
2319
6e90668e
SM
2320sub pp_cond_expr {
2321 my $self = shift;
9d2c6865 2322 my($op, $cx) = @_;
6e90668e
SM
2323 my $cond = $op->first;
2324 my $true = $cond->sibling;
2325 my $false = $true->sibling;
9d2c6865 2326 my $cuddle = $self->{'cuddle'};
6f611a1a 2327 unless ($cx == 0 and (is_scope($true) and $true->name ne "null") and
58cccf98
SM
2328 (is_scope($false) || is_ifelse_cont($false))
2329 and $self->{'expand'} < 7) {
f5aa8f4e 2330 $cond = $self->deparse($cond, 8);
9d2c6865
SM
2331 $true = $self->deparse($true, 8);
2332 $false = $self->deparse($false, 8);
2333 return $self->maybe_parens("$cond ? $true : $false", $cx, 8);
6f611a1a
GS
2334 }
2335
f5aa8f4e 2336 $cond = $self->deparse($cond, 1);
9d2c6865 2337 $true = $self->deparse($true, 0);
6f611a1a
GS
2338 my $head = "if ($cond) {\n\t$true\n\b}";
2339 my @elsifs;
2340 while (!null($false) and is_ifelse_cont($false)) {
2341 my $newop = $false->first;
2342 my $newcond = $newop->first;
2343 my $newtrue = $newcond->sibling;
2344 $false = $newtrue->sibling; # last in chain is OP_AND => no else
2345 $newcond = $self->deparse($newcond, 1);
2346 $newtrue = $self->deparse($newtrue, 0);
2347 push @elsifs, "elsif ($newcond) {\n\t$newtrue\n\b}";
2348 }
2349 if (!null($false)) {
2350 $false = $cuddle . "else {\n\t" .
2351 $self->deparse($false, 0) . "\n\b}\cK";
2352 } else {
2353 $false = "\cK";
6e90668e 2354 }
6f611a1a 2355 return $head . join($cuddle, "", @elsifs) . $false;
6e90668e
SM
2356}
2357
58cccf98 2358sub loop_common {
6e90668e 2359 my $self = shift;
58cccf98 2360 my($op, $cx, $init) = @_;
6e90668e
SM
2361 my $enter = $op->first;
2362 my $kid = $enter->sibling;
a0405c92
RH
2363 local(@$self{qw'curstash warnings hints'})
2364 = @$self{qw'curstash warnings hints'};
6e90668e 2365 my $head = "";
9d2c6865 2366 my $bare = 0;
58cccf98
SM
2367 my $body;
2368 my $cond = undef;
3f872cb9 2369 if ($kid->name eq "lineseq") { # bare or infinite loop
6e90668e 2370 if (is_state $kid->last) { # infinite
e99ebc55 2371 $head = "while (1) "; # Can't use for(;;) if there's a continue
58cccf98 2372 $cond = "";
9d2c6865
SM
2373 } else {
2374 $bare = 1;
6e90668e 2375 }
58cccf98 2376 $body = $kid;
3f872cb9 2377 } elsif ($enter->name eq "enteriter") { # foreach
6e90668e
SM
2378 my $ary = $enter->first->sibling; # first was pushmark
2379 my $var = $ary->sibling;
f5aa8f4e
SM
2380 if ($enter->flags & OPf_STACKED
2381 and not null $ary->first->sibling->sibling)
2382 {
d7f5b6da
SM
2383 $ary = $self->deparse($ary->first->sibling, 9) . " .. " .
2384 $self->deparse($ary->first->sibling->sibling, 9);
d8d95777
GA
2385 } else {
2386 $ary = $self->deparse($ary, 1);
2387 }
6e90668e 2388 if (null $var) {
f6f9bdb7 2389 if ($enter->flags & OPf_SPECIAL) { # thread special var
9d2c6865 2390 $var = $self->pp_threadsv($enter, 1);
f6f9bdb7 2391 } else { # regular my() variable
9d2c6865 2392 $var = $self->pp_padsv($enter, 1);
f6f9bdb7
SM
2393 if ($self->padname_sv($enter->targ)->IVX ==
2394 $kid->first->first->sibling->last->cop_seq)
2395 {
2396 # If the scope of this variable closes at the last
2397 # statement of the loop, it must have been
2398 # declared here.
2399 $var = "my " . $var;
2400 }
6e90668e 2401 }
3f872cb9 2402 } elsif ($var->name eq "rv2gv") {
9d2c6865 2403 $var = $self->pp_rv2sv($var, 1);
3f872cb9 2404 } elsif ($var->name eq "gv") {
9d2c6865 2405 $var = "\$" . $self->deparse($var, 1);
6e90668e 2406 }
9d2c6865 2407 $head = "foreach $var ($ary) ";
58cccf98 2408 $body = $kid->first->first->sibling; # skip OP_AND and OP_ITER
3f872cb9 2409 } elsif ($kid->name eq "null") { # while/until
6e90668e 2410 $kid = $kid->first;
58cccf98
SM
2411 my $name = {"and" => "while", "or" => "until"}->{$kid->name};
2412 $cond = $self->deparse($kid->first, 1);
2413 $head = "$name ($cond) ";
2414 $body = $kid->first->sibling;
3f872cb9 2415 } elsif ($kid->name eq "stub") { # bare and empty
9d2c6865 2416 return "{;}"; # {} could be a hashref
6e90668e 2417 }
58cccf98
SM
2418 # If there isn't a continue block, then the next pointer for the loop
2419 # will point to the unstack, which is kid's penultimate child, except
2420 # in a bare loop, when it will point to the leaveloop. When neither of
2421 # these conditions hold, then the third-to-last child in the continue
2422 # block (or the last in a bare loop).
2423 my $cont_start = $enter->nextop;
2424 my $cont;
c73811ab 2425 if ($$cont_start != $$op && ${$cont_start->sibling} != ${$body->last}) {
58cccf98
SM
2426 if ($bare) {
2427 $cont = $body->last;
2428 } else {
2429 $cont = $body->first;
2430 while (!null($cont->sibling->sibling->sibling)) {
2431 $cont = $cont->sibling;
2432 }
2433 }
2434 my $state = $body->first;
2435 my $cuddle = $self->{'cuddle'};
2436 my @states;
2437 for (; $$state != $$cont; $state = $state->sibling) {
2438 push @states, $state;
2439 }
ce4e655d 2440 $body = $self->lineseq(undef, @states);
58cccf98
SM
2441 if (defined $cond and not is_scope $cont and $self->{'expand'} < 3) {
2442 $head = "for ($init; $cond; " . $self->deparse($cont, 1) .") ";
2443 $cont = "\cK";
2444 } else {
2445 $cont = $cuddle . "continue {\n\t" .
2446 $self->deparse($cont, 0) . "\n\b}\cK";
6e90668e 2447 }
6e90668e 2448 } else {
7a9b44b9 2449 return "" if !defined $body;
c73811ab
RH
2450 if (length $init) {
2451 $head = "for ($init; $cond;) ";
2452 }
9d2c6865 2453 $cont = "\cK";
58cccf98 2454 $body = $self->deparse($body, 0);
6e90668e 2455 }
ce4e655d 2456 $body =~ s/;?$/;\n/;
34a48b4b
RH
2457
2458 return $head . "{\n\t" . $body . "\b}" . $cont;
58cccf98
SM
2459}
2460
2461sub pp_leaveloop { loop_common(@_, "") }
2462
2463sub for_loop {
2464 my $self = shift;
2465 my($op, $cx) = @_;
2466 my $init = $self->deparse($op, 1);
c73811ab 2467 return $self->loop_common($op->sibling->first->sibling, $cx, $init);
6e90668e
SM
2468}
2469
2470sub pp_leavetry {
2471 my $self = shift;
9d2c6865 2472 return "eval {\n\t" . $self->pp_leave(@_) . "\n\b}";
bd0865ec 2473}
6e90668e 2474
bd0865ec
GS
2475BEGIN { eval "sub OP_CONST () {" . opnumber("const") . "}" }
2476BEGIN { eval "sub OP_STRINGIFY () {" . opnumber("stringify") . "}" }
a9760014 2477BEGIN { eval "sub OP_RV2SV () {" . opnumber("rv2sv") . "}" }
90c0eb26 2478BEGIN { eval "sub OP_LIST () {" . opnumber("list") . "}" }
f5aa8f4e 2479
a798dbf2 2480sub pp_null {
6e90668e 2481 my $self = shift;
9d2c6865 2482 my($op, $cx) = @_;
6e90668e 2483 if (class($op) eq "OP") {
f4a44678
SM
2484 # old value is lost
2485 return $self->{'ex_const'} if $op->targ == OP_CONST;
3f872cb9 2486 } elsif ($op->first->name eq "pushmark") {
9d2c6865 2487 return $self->pp_list($op, $cx);
3f872cb9 2488 } elsif ($op->first->name eq "enter") {
9d2c6865 2489 return $self->pp_leave($op, $cx);
bd0865ec 2490 } elsif ($op->targ == OP_STRINGIFY) {
6f611a1a 2491 return $self->dquote($op, $cx);
6e90668e 2492 } elsif (!null($op->first->sibling) and
3f872cb9 2493 $op->first->sibling->name eq "readline" and
6e90668e 2494 $op->first->sibling->flags & OPf_STACKED) {
9d2c6865
SM
2495 return $self->maybe_parens($self->deparse($op->first, 7) . " = "
2496 . $self->deparse($op->first->sibling, 7),
2497 $cx, 7);
6e90668e 2498 } elsif (!null($op->first->sibling) and
3f872cb9 2499 $op->first->sibling->name eq "trans" and
6e90668e 2500 $op->first->sibling->flags & OPf_STACKED) {
9d2c6865
SM
2501 return $self->maybe_parens($self->deparse($op->first, 20) . " =~ "
2502 . $self->deparse($op->first->sibling, 20),
2503 $cx, 20);
c102638c
RH
2504 } elsif ($op->flags & OPf_SPECIAL && $cx == 0 && !$op->targ) {
2505 return "do {\n\t". $self->deparse($op->first, $cx) ."\n\b};";
ad8caead
RGS
2506 } elsif (!null($op->first->sibling) and
2507 $op->first->sibling->name eq "null" and
2508 class($op->first->sibling) eq "UNOP" and
2509 $op->first->sibling->first->flags & OPf_STACKED and
2510 $op->first->sibling->first->name eq "rcatline") {
2511 return $self->maybe_parens($self->deparse($op->first, 18) . " .= "
2512 . $self->deparse($op->first->sibling, 18),
2513 $cx, 18);
6e90668e 2514 } else {
9d2c6865 2515 return $self->deparse($op->first, $cx);
6e90668e 2516 }
a798dbf2
MB
2517}
2518
6e90668e
SM
2519sub padname {
2520 my $self = shift;
2521 my $targ = shift;
68223ea3 2522 return $self->padname_sv($targ)->PVX;
6e90668e
SM
2523}
2524
2525sub padany {
2526 my $self = shift;
2527 my $op = shift;
2528 return substr($self->padname($op->targ), 1); # skip $/@/%
2529}
2530
2531sub pp_padsv {
2532 my $self = shift;
9d2c6865
SM
2533 my($op, $cx) = @_;
2534 return $self->maybe_my($op, $cx, $self->padname($op->targ));
6e90668e
SM
2535}
2536
2537sub pp_padav { pp_padsv(@_) }
2538sub pp_padhv { pp_padsv(@_) }
2539
9d2c6865
SM
2540my @threadsv_names;
2541
2542BEGIN {
2543 @threadsv_names = ("_", "1", "2", "3", "4", "5", "6", "7", "8", "9",
2544 "&", "`", "'", "+", "/", ".", ",", "\\", '"', ";",
2545 "^", "-", "%", "=", "|", "~", ":", "^A", "^E",
2546 "!", "@");
2547}
f6f9bdb7
SM
2548
2549sub pp_threadsv {
2550 my $self = shift;
9d2c6865
SM
2551 my($op, $cx) = @_;
2552 return $self->maybe_local($op, $cx, "\$" . $threadsv_names[$op->targ]);
f6f9bdb7
SM
2553}
2554
6f611a1a 2555sub gv_or_padgv {
18228111
GS
2556 my $self = shift;
2557 my $op = shift;
6f611a1a
GS
2558 if (class($op) eq "PADOP") {
2559 return $self->padval($op->padix);
2560 } else { # class($op) eq "SVOP"
2561 return $op->gv;
18228111 2562 }
18228111
GS
2563}
2564
6e90668e
SM
2565sub pp_gvsv {
2566 my $self = shift;
9d2c6865 2567 my($op, $cx) = @_;
6f611a1a 2568 my $gv = $self->gv_or_padgv($op);
8510e997
RH
2569 return $self->maybe_local($op, $cx, $self->stash_variable("\$",
2570 $self->gv_name($gv)));
6e90668e
SM
2571}
2572
2573sub pp_gv {
2574 my $self = shift;
9d2c6865 2575 my($op, $cx) = @_;
6f611a1a 2576 my $gv = $self->gv_or_padgv($op);
18228111 2577 return $self->gv_name($gv);
6e90668e
SM
2578}
2579
2580sub pp_aelemfast {
2581 my $self = shift;
9d2c6865 2582 my($op, $cx) = @_;
6f611a1a 2583 my $gv = $self->gv_or_padgv($op);
ce4e655d
RH
2584 my $name = $self->gv_name($gv);
2585 $name = $self->{'curstash'}."::$name"
2586 if $name !~ /::/ && $self->lex_in_scope('@'.$name);
2587
2588 return "\$" . $name . "[" .
7a9b44b9 2589 ($op->private + $self->{'arybase'}) . "]";
6e90668e
SM
2590}
2591
2592sub rv2x {
2593 my $self = shift;
9d2c6865 2594 my($op, $cx, $type) = @_;
90c0eb26
RH
2595
2596 if (class($op) eq 'NULL' || !$op->can("first")) {
ff97752d 2597 carp("Unexpected op in pp_rv2x");
90c0eb26
RH
2598 return 'XXX';
2599 }
6e90668e 2600 my $kid = $op->first;
f5aa8f4e 2601 my $str = $self->deparse($kid, 0);
8510e997
RH
2602 return $self->stash_variable($type, $str) if is_scalar($kid);
2603 return $type ."{$str}";
6e90668e
SM
2604}
2605
2606sub pp_rv2sv { maybe_local(@_, rv2x(@_, "\$")) }
2607sub pp_rv2hv { maybe_local(@_, rv2x(@_, "%")) }
2608sub pp_rv2gv { maybe_local(@_, rv2x(@_, "*")) }
2609
2610# skip rv2av
2611sub pp_av2arylen {
2612 my $self = shift;
9d2c6865 2613 my($op, $cx) = @_;
3f872cb9 2614 if ($op->first->name eq "padav") {
9d2c6865 2615 return $self->maybe_local($op, $cx, '$#' . $self->padany($op->first));
6e90668e 2616 } else {
f5aa8f4e
SM
2617 return $self->maybe_local($op, $cx,
2618 $self->rv2x($op->first, $cx, '$#'));
6e90668e
SM
2619 }
2620}
2621
2622# skip down to the old, ex-rv2cv
90c0eb26
RH
2623sub pp_rv2cv {
2624 my ($self, $op, $cx) = @_;
2625 if (!null($op->first) && $op->first->name eq 'null' &&
2626 $op->first->targ eq OP_LIST)
2627 {
2628 return $self->rv2x($op->first->first->sibling, $cx, "&")
2629 }
2630 else {
2631 return $self->rv2x($op, $cx, "")
2632 }
2633}
6e90668e
SM
2634
2635sub pp_rv2av {
2636 my $self = shift;
9d2c6865 2637 my($op, $cx) = @_;
6e90668e 2638 my $kid = $op->first;
3f872cb9 2639 if ($kid->name eq "const") { # constant list
18228111 2640 my $av = $self->const_sv($kid);
6e90668e
SM
2641 return "(" . join(", ", map(const($_), $av->ARRAY)) . ")";
2642 } else {
9d2c6865 2643 return $self->maybe_local($op, $cx, $self->rv2x($op, $cx, "\@"));
6e90668e
SM
2644 }
2645 }
2646
3ed82cfc
GS
2647sub is_subscriptable {
2648 my $op = shift;
2649 if ($op->name =~ /^[ahg]elem/) {
2650 return 1;
2651 } elsif ($op->name eq "entersub") {
2652 my $kid = $op->first;
2653 return 0 unless null $kid->sibling;
2654 $kid = $kid->first;
2655 $kid = $kid->sibling until null $kid->sibling;
2656 return 0 if is_scope($kid);
2657 $kid = $kid->first;
2658 return 0 if $kid->name eq "gv";
2659 return 0 if is_scalar($kid);
2660 return is_subscriptable($kid);
2661 } else {
2662 return 0;
2663 }
2664}
6e90668e
SM
2665
2666sub elem {
2667 my $self = shift;
9d2c6865 2668 my ($op, $cx, $left, $right, $padname) = @_;
6e90668e 2669 my($array, $idx) = ($op->first, $op->first->sibling);
3f872cb9 2670 unless ($array->name eq $padname) { # Maybe this has been fixed
6e90668e
SM
2671 $array = $array->first; # skip rv2av (or ex-rv2av in _53+)
2672 }
3f872cb9 2673 if ($array->name eq $padname) {
6e90668e
SM
2674 $array = $self->padany($array);
2675 } elsif (is_scope($array)) { # ${expr}[0]
9d2c6865 2676 $array = "{" . $self->deparse($array, 0) . "}";
ce4e655d
RH
2677 } elsif ($array->name eq "gv") {
2678 $array = $self->gv_name($self->gv_or_padgv($array));
2679 if ($array !~ /::/) {
2680 my $prefix = ($left eq '[' ? '@' : '%');
2681 $array = $self->{curstash}.'::'.$array
2682 if $self->lex_in_scope($prefix . $array);
2683 }
6e90668e 2684 } elsif (is_scalar $array) { # $x[0], $$x[0], ...
9d2c6865 2685 $array = $self->deparse($array, 24);
6e90668e
SM
2686 } else {
2687 # $x[20][3]{hi} or expr->[20]
3ed82cfc 2688 my $arrow = is_subscriptable($array) ? "" : "->";
9d2c6865
SM
2689 return $self->deparse($array, 24) . $arrow .
2690 $left . $self->deparse($idx, 1) . $right;
6e90668e 2691 }
9d2c6865 2692 $idx = $self->deparse($idx, 1);
7a9b44b9
RH
2693
2694 # Outer parens in an array index will confuse perl
2695 # if we're interpolating in a regular expression, i.e.
2696 # /$x$foo[(-1)]/ is *not* the same as /$x$foo[-1]/
2697 #
2698 # If $self->{parens}, then an initial '(' will
2699 # definitely be paired with a final ')'. If
2700 # !$self->{parens}, the misleading parens won't
2701 # have been added in the first place.
2702 #
2703 # [You might think that we could get "(...)...(...)"
2704 # where the initial and final parens do not match
2705 # each other. But we can't, because the above would
2706 # only happen if there's an infix binop between the
2707 # two pairs of parens, and *that* means that the whole
2708 # expression would be parenthesized as well.]
2709 #
2710 $idx =~ s/^\((.*)\)$/$1/ if $self->{'parens'};
2711
098251bc
RH
2712 # Hash-element braces will autoquote a bareword inside themselves.
2713 # We need to make sure that C<$hash{warn()}> doesn't come out as
2714 # C<$hash{warn}>, which has a quite different meaning. Currently
2715 # B::Deparse will always quote strings, even if the string was a
2716 # bareword in the original (i.e. the OPpCONST_BARE flag is ignored
2717 # for constant strings.) So we can cheat slightly here - if we see
2718 # a bareword, we know that it is supposed to be a function call.
2719 #
2720 $idx =~ s/^([A-Za-z_]\w*)$/$1()/;
2721
6e90668e
SM
2722 return "\$" . $array . $left . $idx . $right;
2723}
2724
3f872cb9
GS
2725sub pp_aelem { maybe_local(@_, elem(@_, "[", "]", "padav")) }
2726sub pp_helem { maybe_local(@_, elem(@_, "{", "}", "padhv")) }
6e90668e
SM
2727
2728sub pp_gelem {
2729 my $self = shift;
9d2c6865 2730 my($op, $cx) = @_;
6e90668e
SM
2731 my($glob, $part) = ($op->first, $op->last);
2732 $glob = $glob->first; # skip rv2gv
3f872cb9 2733 $glob = $glob->first if $glob->name eq "rv2gv"; # this one's a bug
9d2c6865
SM
2734 my $scope = is_scope($glob);
2735 $glob = $self->deparse($glob, 0);
2736 $part = $self->deparse($part, 1);
6e90668e
SM
2737 return "*" . ($scope ? "{$glob}" : $glob) . "{$part}";
2738}
2739
2740sub slice {
2741 my $self = shift;
9d2c6865 2742 my ($op, $cx, $left, $right, $regname, $padname) = @_;
6e90668e
SM
2743 my $last;
2744 my(@elems, $kid, $array, $list);
2745 if (class($op) eq "LISTOP") {
2746 $last = $op->last;
2747 } else { # ex-hslice inside delete()
2748 for ($kid = $op->first; !null $kid->sibling; $kid = $kid->sibling) {}
2749 $last = $kid;
2750 }
2751 $array = $last;
2752 $array = $array->first
3f872cb9 2753 if $array->name eq $regname or $array->name eq "null";
6e90668e 2754 if (is_scope($array)) {
9d2c6865 2755 $array = "{" . $self->deparse($array, 0) . "}";
3f872cb9 2756 } elsif ($array->name eq $padname) {
6e90668e
SM
2757 $array = $self->padany($array);
2758 } else {
9d2c6865 2759 $array = $self->deparse($array, 24);
6e90668e
SM
2760 }
2761 $kid = $op->first->sibling; # skip pushmark
3f872cb9 2762 if ($kid->name eq "list") {
6e90668e
SM
2763 $kid = $kid->first->sibling; # skip list, pushmark
2764 for (; !null $kid; $kid = $kid->sibling) {
9d2c6865 2765 push @elems, $self->deparse($kid, 6);
6e90668e
SM
2766 }
2767 $list = join(", ", @elems);
2768 } else {
9d2c6865 2769 $list = $self->deparse($kid, 1);
6e90668e
SM
2770 }
2771 return "\@" . $array . $left . $list . $right;
2772}
2773
3ed82cfc
GS
2774sub pp_aslice { maybe_local(@_, slice(@_, "[", "]", "rv2av", "padav")) }
2775sub pp_hslice { maybe_local(@_, slice(@_, "{", "}", "rv2hv", "padhv")) }
6e90668e
SM
2776
2777sub pp_lslice {
2778 my $self = shift;
9d2c6865 2779 my($op, $cx) = @_;
6e90668e
SM
2780 my $idx = $op->first;
2781 my $list = $op->last;
2782 my(@elems, $kid);
9d2c6865
SM
2783 $list = $self->deparse($list, 1);
2784 $idx = $self->deparse($idx, 1);
2785 return "($list)" . "[$idx]";
6e90668e
SM
2786}
2787
6e90668e
SM
2788sub want_scalar {
2789 my $op = shift;
2790 return ($op->flags & OPf_WANT) == OPf_WANT_SCALAR;
2791}
2792
bd0865ec
GS
2793sub want_list {
2794 my $op = shift;
2795 return ($op->flags & OPf_WANT) == OPf_WANT_LIST;
2796}
2797
2798sub method {
6e90668e 2799 my $self = shift;
9d2c6865 2800 my($op, $cx) = @_;
bd0865ec
GS
2801 my $kid = $op->first->sibling; # skip pushmark
2802 my($meth, $obj, @exprs);
3f872cb9 2803 if ($kid->name eq "list" and want_list $kid) {
bd0865ec
GS
2804 # When an indirect object isn't a bareword but the args are in
2805 # parens, the parens aren't part of the method syntax (the LLAFR
2806 # doesn't apply), but they make a list with OPf_PARENS set that
2807 # doesn't get flattened by the append_elem that adds the method,
2808 # making a (object, arg1, arg2, ...) list where the object
2809 # usually is. This can be distinguished from
2810 # `($obj, $arg1, $arg2)->meth()' (which is legal if $arg2 is an
2811 # object) because in the later the list is in scalar context
2812 # as the left side of -> always is, while in the former
2813 # the list is in list context as method arguments always are.
2814 # (Good thing there aren't method prototypes!)
3ed82cfc 2815 $meth = $kid->sibling;
bd0865ec
GS
2816 $kid = $kid->first->sibling; # skip pushmark
2817 $obj = $kid;
6e90668e 2818 $kid = $kid->sibling;
bd0865ec 2819 for (; not null $kid; $kid = $kid->sibling) {
9d2c6865 2820 push @exprs, $self->deparse($kid, 6);
6e90668e 2821 }
bd0865ec
GS
2822 } else {
2823 $obj = $kid;
2824 $kid = $kid->sibling;
90c0eb26
RH
2825 for (; !null ($kid->sibling) && $kid->name ne "method_named";
2826 $kid = $kid->sibling) {
bd0865ec 2827 push @exprs, $self->deparse($kid, 6);
6e90668e 2828 }
3ed82cfc 2829 $meth = $kid;
bd0865ec
GS
2830 }
2831 $obj = $self->deparse($obj, 24);
3ed82cfc 2832 if ($meth->name eq "method_named") {
18228111 2833 $meth = $self->const_sv($meth)->PV;
bd0865ec 2834 } else {
3ed82cfc
GS
2835 $meth = $meth->first;
2836 if ($meth->name eq "const") {
2837 # As of 5.005_58, this case is probably obsoleted by the
2838 # method_named case above
18228111 2839 $meth = $self->const_sv($meth)->PV; # needs to be bare
3ed82cfc
GS
2840 } else {
2841 $meth = $self->deparse($meth, 1);
2842 }
bd0865ec
GS
2843 }
2844 my $args = join(", ", @exprs);
2845 $kid = $obj . "->" . $meth;
145eb477 2846 if (length $args) {
bd0865ec
GS
2847 return $kid . "(" . $args . ")"; # parens mandatory
2848 } else {
2849 return $kid;
2850 }
2851}
2852
2853# returns "&" if the prototype doesn't match the args,
2854# or ("", $args_after_prototype_demunging) if it does.
2855sub check_proto {
2856 my $self = shift;
2857 my($proto, @args) = @_;
2858 my($arg, $real);
2859 my $doneok = 0;
2860 my @reals;
2861 # An unbackslashed @ or % gobbles up the rest of the args
2862 $proto =~ s/([^\\]|^)([@%])(.*)$/$1$2/;
2863 while ($proto) {
2864 $proto =~ s/^ *([\\]?[\$\@&%*]|;)//;
2865 my $chr = $1;
2866 if ($chr eq "") {
2867 return "&" if @args;
2868 } elsif ($chr eq ";") {
2869 $doneok = 1;
2870 } elsif ($chr eq "@" or $chr eq "%") {
2871 push @reals, map($self->deparse($_, 6), @args);
2872 @args = ();
6e90668e 2873 } else {
bd0865ec
GS
2874 $arg = shift @args;
2875 last unless $arg;
2876 if ($chr eq "\$") {
2877 if (want_scalar $arg) {
2878 push @reals, $self->deparse($arg, 6);
2879 } else {
2880 return "&";
2881 }
2882 } elsif ($chr eq "&") {
3f872cb9 2883 if ($arg->name =~ /^(s?refgen|undef)$/) {
bd0865ec
GS
2884 push @reals, $self->deparse($arg, 6);
2885 } else {
2886 return "&";
2887 }
2888 } elsif ($chr eq "*") {
3f872cb9
GS
2889 if ($arg->name =~ /^s?refgen$/
2890 and $arg->first->first->name eq "rv2gv")
bd0865ec
GS
2891 {
2892 $real = $arg->first->first; # skip refgen, null
3f872cb9 2893 if ($real->first->name eq "gv") {
bd0865ec
GS
2894 push @reals, $self->deparse($real, 6);
2895 } else {
2896 push @reals, $self->deparse($real->first, 6);
2897 }
2898 } else {
2899 return "&";
2900 }
2901 } elsif (substr($chr, 0, 1) eq "\\") {
2902 $chr = substr($chr, 1);
3f872cb9 2903 if ($arg->name =~ /^s?refgen$/ and
bd0865ec
GS
2904 !null($real = $arg->first) and
2905 ($chr eq "\$" && is_scalar($real->first)
2906 or ($chr eq "\@"
3f872cb9
GS
2907 && $real->first->sibling->name
2908 =~ /^(rv2|pad)av$/)
bd0865ec 2909 or ($chr eq "%"
3f872cb9
GS
2910 && $real->first->sibling->name
2911 =~ /^(rv2|pad)hv$/)
bd0865ec 2912 #or ($chr eq "&" # This doesn't work
3f872cb9 2913 # && $real->first->name eq "rv2cv")
bd0865ec 2914 or ($chr eq "*"
3f872cb9 2915 && $real->first->name eq "rv2gv")))
bd0865ec
GS
2916 {
2917 push @reals, $self->deparse($real, 6);
2918 } else {
2919 return "&";
2920 }
2921 }
2922 }
9d2c6865 2923 }
bd0865ec
GS
2924 return "&" if $proto and !$doneok; # too few args and no `;'
2925 return "&" if @args; # too many args
2926 return ("", join ", ", @reals);
2927}
2928
2929sub pp_entersub {
2930 my $self = shift;
2931 my($op, $cx) = @_;
2932 return $self->method($op, $cx) unless null $op->first->sibling;
2933 my $prefix = "";
2934 my $amper = "";
2935 my($kid, @exprs);
90c0eb26 2936 if ($op->flags & OPf_SPECIAL && !($op->flags & OPf_MOD)) {
9d2c6865
SM
2937 $prefix = "do ";
2938 } elsif ($op->private & OPpENTERSUB_AMPER) {
2939 $amper = "&";
2940 }
2941 $kid = $op->first;
2942 $kid = $kid->first->sibling; # skip ex-list, pushmark
2943 for (; not null $kid->sibling; $kid = $kid->sibling) {
2944 push @exprs, $kid;
2945 }
bd0865ec
GS
2946 my $simple = 0;
2947 my $proto = undef;
9d2c6865
SM
2948 if (is_scope($kid)) {
2949 $amper = "&";
2950 $kid = "{" . $self->deparse($kid, 0) . "}";
3f872cb9 2951 } elsif ($kid->first->name eq "gv") {
6f611a1a 2952 my $gv = $self->gv_or_padgv($kid->first);
9d2c6865
SM
2953 if (class($gv->CV) ne "SPECIAL") {
2954 $proto = $gv->CV->PV if $gv->CV->FLAGS & SVf_POK;
2955 }
bd0865ec 2956 $simple = 1; # only calls of named functions can be prototyped
9d2c6865 2957 $kid = $self->deparse($kid, 24);
90c0eb26 2958 } elsif (is_scalar ($kid->first) && $kid->first->name ne 'rv2cv') {
9d2c6865
SM
2959 $amper = "&";
2960 $kid = $self->deparse($kid, 24);
2961 } else {
2962 $prefix = "";
3ed82cfc
GS
2963 my $arrow = is_subscriptable($kid->first) ? "" : "->";
2964 $kid = $self->deparse($kid, 24) . $arrow;
9d2c6865 2965 }
0ca62a8e
RH
2966
2967 # Doesn't matter how many prototypes there are, if
2968 # they haven't happened yet!
1d38190f
RGS
2969 my $declared;
2970 {
2971 no strict 'refs';
2972 no warnings 'uninitialized';
2973 $declared = exists $self->{'subs_declared'}{$kid}
2974 || (
2975 defined &{ %{$self->{'curstash'}."::"}->{$kid} }
2976 && !exists
2977 $self->{'subs_deparsed'}{$self->{'curstash'}."::".$kid}
2978 && defined prototype $self->{'curstash'}."::".$kid
2979 );
2980 if (!$declared && defined($proto)) {
2981 # Avoid "too early to check prototype" warning
2982 ($amper, $proto) = ('&');
2983 }
e99ebc55 2984 }
0ca62a8e 2985
bd0865ec 2986 my $args;
0ca62a8e 2987 if ($declared and defined $proto and not $amper) {
bd0865ec
GS
2988 ($amper, $args) = $self->check_proto($proto, @exprs);
2989 if ($amper eq "&") {
9d2c6865
SM
2990 $args = join(", ", map($self->deparse($_, 6), @exprs));
2991 }
2992 } else {
2993 $args = join(", ", map($self->deparse($_, 6), @exprs));
6e90668e 2994 }
9d2c6865
SM
2995 if ($prefix or $amper) {
2996 if ($op->flags & OPf_STACKED) {
2997 return $prefix . $amper . $kid . "(" . $args . ")";
2998 } else {
2999 return $prefix . $amper. $kid;
3000 }
6e90668e 3001 } else {
34a48b4b 3002 # glob() invocations can be translated into calls of
d1be9408 3003 # CORE::GLOBAL::glob with a second parameter, a number.
34a48b4b
RH
3004 # Reverse this.
3005 if ($kid eq "CORE::GLOBAL::glob") {
3006 $kid = "glob";
3007 $args =~ s/\s*,[^,]+$//;
3008 }
3009
3010 # It's a syntax error to call CORE::GLOBAL::foo without a prefix,
3011 # so it must have been translated from a keyword call. Translate
3012 # it back.
3013 $kid =~ s/^CORE::GLOBAL:://;
3014
0ca62a8e
RH
3015 if (!$declared) {
3016 return "$kid(" . $args . ")";
3017 } elsif (defined $proto and $proto eq "") {
9d2c6865 3018 return $kid;
ce4e655d 3019 } elsif (defined $proto and $proto eq "\$" and is_scalar($exprs[0])) {
9d2c6865 3020 return $self->maybe_parens_func($kid, $args, $cx, 16);
6f611a1a 3021 } elsif (defined($proto) && $proto or $simple) {
9d2c6865
SM
3022 return $self->maybe_parens_func($kid, $args, $cx, 5);
3023 } else {
3024 return "$kid(" . $args . ")";
3025 }
6e90668e
SM
3026 }
3027}
3028
3029sub pp_enterwrite { unop(@_, "write") }
3030
3031# escape things that cause interpolation in double quotes,
3032# but not character escapes
3033sub uninterp {
3034 my($str) = @_;
3f766ba3 3035 $str =~ s/(^|\G|[^\\])((?:\\\\)*)([\$\@]|\\[uUlLQE])/$1$2\\$3/g;
9d2c6865
SM
3036 return $str;
3037}
3038
b7dad2dc
RH
3039{
3040my $bal;
3041BEGIN {
cdf8218f
RH
3042 use re "eval";
3043 # Matches any string which is balanced with respect to {braces}
b7dad2dc 3044 $bal = qr(
cdf8218f
RH
3045 (?:
3046 [^\\{}]
3047 | \\\\
3048 | \\[{}]
3049 | \{(??{$bal})\}
3050 )*
3051 )x;
b7dad2dc
RH
3052}
3053
3054# the same, but treat $|, $), $( and $ at the end of the string differently
3055sub re_uninterp {
3056 my($str) = @_;
cdf8218f
RH
3057
3058 $str =~ s/
3059 ( ^|\G # $1
3060 | [^\\]
3061 )
3062
3063 ( # $2
3064 (?:\\\\)*
3065 )
3066
3067 ( # $3
3068 (\(\?\??\{$bal\}\)) # $4
3069 | [\$\@]
3070 (?!\||\)|\(|$)
3071 | \\[uUlLQE]
3072 )
3073
3074 /length($4) ? "$1$2$4" : "$1$2\\$3"/xeg;
3075
6e90668e
SM
3076 return $str;
3077}
3078
b7dad2dc
RH
3079# This is for regular expressions with the /x modifier
3080# We have to leave comments unmangled.
a9760014 3081sub re_uninterp_extended {
b7dad2dc
RH
3082 my($str) = @_;
3083
3084 $str =~ s/
3085 ( ^|\G # $1
3086 | [^\\]
3087 )
3088
3089 ( # $2
3090 (?:\\\\)*
3091 )
3092
3093 ( # $3
3094 ( \(\?\??\{$bal\}\) # $4 (skip over (?{}) and (??{}) blocks)
3095 | \#[^\n]* # (skip over comments)
3096 )
3097 | [\$\@]
3098 (?!\||\)|\(|$)
3099 | \\[uUlLQE]
3100 )
3101
3102 /length($4) ? "$1$2$4" : "$1$2\\$3"/xeg;
3103
a9760014
RH
3104 return $str;
3105}
b7dad2dc 3106}
a9760014 3107
6e90668e 3108# character escapes, but not delimiters that might need to be escaped
746698c5 3109sub escape_str { # ASCII, UTF8
6e90668e 3110 my($str) = @_;
746698c5 3111 $str =~ s/(.)/ord($1)>255 ? sprintf("\\x{%x}", ord($1)) : $1/eg;
6e90668e
SM
3112 $str =~ s/\a/\\a/g;
3113# $str =~ s/\cH/\\b/g; # \b means someting different in a regex
3114 $str =~ s/\t/\\t/g;
3115 $str =~ s/\n/\\n/g;
3116 $str =~ s/\e/\\e/g;
3117 $str =~ s/\f/\\f/g;
3118 $str =~ s/\r/\\r/g;
3119 $str =~ s/([\cA-\cZ])/'\\c' . chr(ord('@') + ord($1))/ge;
3120 $str =~ s/([\0\033-\037\177-\377])/'\\' . sprintf("%03o", ord($1))/ge;
3121 return $str;
3122}
3123
b7dad2dc
RH
3124# For regexes with the /x modifier.
3125# Leave whitespace unmangled.
a9760014
RH
3126sub escape_extended_re {
3127 my($str) = @_;
3128 $str =~ s/(.)/ord($1)>255 ? sprintf("\\x{%x}", ord($1)) : $1/eg;
3129 $str =~ s/([\0\033-\037\177-\377])/'\\' . sprintf("%03o", ord($1))/ge;
3130 $str =~ s/\n/\n\f/g;
3131 return $str;
3132}
3133
9d2c6865
SM
3134# Don't do this for regexen
3135sub unback {
3136 my($str) = @_;
3137 $str =~ s/\\/\\\\/g;
3138 return $str;
3139}
3140
08c6f5ec
RH
3141# Remove backslashes which precede literal control characters,
3142# to avoid creating ambiguity when we escape the latter.
3143sub re_unback {
3144 my($str) = @_;
3145
3146 # the insane complexity here is due to the behaviour of "\c\"
3147 $str =~ s/(^|[^\\]|\\c\\)(?<!\\c)\\(\\\\)*(?=[\0-\031\177-\377])/$1$2/g;
3148 return $str;
3149}
3150
6e90668e
SM
3151sub balanced_delim {
3152 my($str) = @_;
3153 my @str = split //, $str;
3154 my($ar, $open, $close, $fail, $c, $cnt);
3155 for $ar (['[',']'], ['(',')'], ['<','>'], ['{','}']) {
3156 ($open, $close) = @$ar;
3157 $fail = 0; $cnt = 0;
3158 for $c (@str) {
3159 if ($c eq $open) {
3160 $cnt++;
3161 } elsif ($c eq $close) {
3162 $cnt--;
3163 if ($cnt < 0) {
bd0865ec 3164 # qq()() isn't ")("
6e90668e
SM
3165 $fail = 1;
3166 last;
3167 }
3168 }
3169 }
3170 $fail = 1 if $cnt != 0;
3171 return ($open, "$open$str$close") if not $fail;
3172 }
3173 return ("", $str);
3174}
3175
3176sub single_delim {
3177 my($q, $default, $str) = @_;
90be192f 3178 return "$default$str$default" if $default and index($str, $default) == -1;
8347ad86
RGS
3179 if ($q ne 'qr') {
3180 (my $succeed, $str) = balanced_delim($str);
3181 return "$q$str" if $succeed;
3182 }
3183 for my $delim ('/', '"', '#') {
6e90668e
SM
3184 return "$q$delim" . $str . $delim if index($str, $delim) == -1;
3185 }
90be192f
SM
3186 if ($default) {
3187 $str =~ s/$default/\\$default/g;
3188 return "$default$str$default";
3189 } else {
3190 $str =~ s[/][\\/]g;
3191 return "$q/$str/";
3192 }
6e90668e
SM
3193}
3194
6e90668e
SM
3195sub const {
3196 my $sv = shift;
3197 if (class($sv) eq "SPECIAL") {
bd0865ec 3198 return ('undef', '1', '0')[$$sv-1]; # sv_undef, sv_yes, sv_no
7a9b44b9
RH
3199 } elsif (class($sv) eq "NULL") {
3200 return 'undef';
6e90668e 3201 } elsif ($sv->FLAGS & SVf_IOK) {
d9963e60 3202 return $sv->int_value;
6e90668e 3203 } elsif ($sv->FLAGS & SVf_NOK) {
fecea806
RH
3204 # try the default stringification
3205 my $r = "".$sv->NV;
3206 if ($r =~ /e/) {
3207 # If it's in scientific notation, we might have lost information
3208 return sprintf("%.20e", $sv->NV);
3209 }
3210 return $r;
7a9b44b9 3211 } elsif ($sv->FLAGS & SVf_ROK && $sv->can("RV")) {
6e90668e 3212 return "\\(" . const($sv->RV) . ")"; # constant folded
34768ba5 3213 } elsif ($sv->FLAGS & SVf_POK) {
6e90668e 3214 my $str = $sv->PV;
bd0865ec 3215 if ($str =~ /[^ -~]/) { # ASCII for non-printing
9d2c6865 3216 return single_delim("qq", '"', uninterp escape_str unback $str);
6e90668e 3217 } else {
bd0865ec 3218 return single_delim("q", "'", unback $str);
6e90668e 3219 }
34768ba5
RH
3220 } else {
3221 return "undef";
a798dbf2
MB
3222 }
3223}
3224
18228111
GS
3225sub const_sv {
3226 my $self = shift;
3227 my $op = shift;
3228 my $sv = $op->sv;
3229 # the constant could be in the pad (under useithreads)
3230 $sv = $self->padval($op->targ) unless $$sv;
3231 return $sv;
3232}
3233
6e90668e
SM
3234sub pp_const {
3235 my $self = shift;
9d2c6865 3236 my($op, $cx) = @_;
7e40138b
RH
3237 if ($op->private & OPpCONST_ARYBASE) {
3238 return '$[';
3239 }
4c1f658f 3240# if ($op->private & OPpCONST_BARE) { # trouble with `=>' autoquoting
18228111 3241# return $self->const_sv($op)->PV;
6e90668e 3242# }
18228111 3243 my $sv = $self->const_sv($op);
d5ae42cc
JM
3244# return const($sv);
3245 my $c = const $sv;
76ef7183 3246 return $c =~ /^-\d/ ? $self->maybe_parens($c, $cx, 21) : $c;
6e90668e
SM
3247}
3248
3249sub dq {
3250 my $self = shift;
3251 my $op = shift;
3f872cb9
GS
3252 my $type = $op->name;
3253 if ($type eq "const") {
f3402b25
RH
3254 return '$[' if $op->private & OPpCONST_ARYBASE;
3255 return uninterp(escape_str(unback($self->const_sv($op)->as_string)));
3f872cb9 3256 } elsif ($type eq "concat") {
8fed1104
RH
3257 my $first = $self->dq($op->first);
3258 my $last = $self->dq($op->last);
44c6d2a1 3259
b7dad2dc 3260 # Disambiguate "${foo}bar", "${foo}{bar}", "${foo}[1]"
44c6d2a1
RH
3261 ($last =~ /^[A-Z\\\^\[\]_?]/ &&
3262 $first =~ s/([\$@])\^$/${1}{^}/) # "${^}W" etc
3263 || ($last =~ /^[{\[\w_]/ &&
3264 $first =~ s/([\$@])([A-Za-z_]\w*)$/${1}{$2}/);
3265
8fed1104 3266 return $first . $last;
3f872cb9 3267 } elsif ($type eq "uc") {
6e90668e 3268 return '\U' . $self->dq($op->first->sibling) . '\E';
3f872cb9 3269 } elsif ($type eq "lc") {
6e90668e 3270 return '\L' . $self->dq($op->first->sibling) . '\E';
3f872cb9 3271 } elsif ($type eq "ucfirst") {
6e90668e 3272 return '\u' . $self->dq($op->first->sibling);
3f872cb9 3273 } elsif ($type eq "lcfirst") {
6e90668e 3274 return '\l' . $self->dq($op->first->sibling);
3f872cb9 3275 } elsif ($type eq "quotemeta") {
6e90668e 3276 return '\Q' . $self->dq($op->first->sibling) . '\E';
3f872cb9 3277 } elsif ($type eq "join") {
9d2c6865 3278 return $self->deparse($op->last, 26); # was join($", @ary)
a798dbf2 3279 } else {
9d2c6865 3280 return $self->deparse($op, 26);
6e90668e
SM
3281 }
3282}
3283
3284sub pp_backtick {
3285 my $self = shift;
9d2c6865 3286 my($op, $cx) = @_;
6e90668e
SM
3287 # skip pushmark
3288 return single_delim("qx", '`', $self->dq($op->first->sibling));
3289}
3290
3291sub dquote {
3292 my $self = shift;
6f611a1a 3293 my($op, $cx) = @_;
3ed82cfc
GS
3294 my $kid = $op->first->sibling; # skip ex-stringify, pushmark
3295 return $self->deparse($kid, $cx) if $self->{'unquote'};
3296 $self->maybe_targmy($kid, $cx,
3297 sub {single_delim("qq", '"', $self->dq($_[1]))});
6e90668e
SM
3298}
3299
bd0865ec 3300# OP_STRINGIFY is a listop, but it only ever has one arg
3ed82cfc 3301sub pp_stringify { maybe_targmy(@_, \&dquote) }
6e90668e
SM
3302
3303# tr/// and s/// (and tr[][], tr[]//, tr###, etc)
3304# note that tr(from)/to/ is OK, but not tr/from/(to)
3305sub double_delim {
3306 my($from, $to) = @_;
3307 my($succeed, $delim);
3308 if ($from !~ m[/] and $to !~ m[/]) {
3309 return "/$from/$to/";
3310 } elsif (($succeed, $from) = balanced_delim($from) and $succeed) {
3311 if (($succeed, $to) = balanced_delim($to) and $succeed) {
3312 return "$from$to";
3313 } else {
3314 for $delim ('/', '"', '#') { # note no `'' -- s''' is special
3315 return "$from$delim$to$delim" if index($to, $delim) == -1;
3316 }
3317 $to =~ s[/][\\/]g;
3318 return "$from/$to/";
3319 }
3320 } else {
3321 for $delim ('/', '"', '#') { # note no '
3322 return "$delim$from$delim$to$delim"
3323 if index($to . $from, $delim) == -1;
3324 }
3325 $from =~ s[/][\\/]g;
3326 $to =~ s[/][\\/]g;
3327 return "/$from/$to/";
3328 }
3329}
3330
2a9e2f8a 3331# Only used by tr///, so backslashes hyphens
6e90668e
SM
3332sub pchr { # ASCII
3333 my($n) = @_;
3334 if ($n == ord '\\') {
3335 return '\\\\';
2a9e2f8a
RH
3336 } elsif ($n == ord "-") {
3337 return "\\-";
6e90668e
SM
3338 } elsif ($n >= ord(' ') and $n <= ord('~')) {
3339 return chr($n);
3340 } elsif ($n == ord "\a") {
3341 return '\\a';
3342 } elsif ($n == ord "\b") {
3343 return '\\b';
3344 } elsif ($n == ord "\t") {
3345 return '\\t';
3346 } elsif ($n == ord "\n") {
3347 return '\\n';
3348 } elsif ($n == ord "\e") {
3349 return '\\e';
3350 } elsif ($n == ord "\f") {
3351 return '\\f';
3352 } elsif ($n == ord "\r") {
3353 return '\\r';
3354 } elsif ($n >= ord("\cA") and $n <= ord("\cZ")) {
3355 return '\\c' . chr(ord("@") + $n);
3356 } else {
3357# return '\x' . sprintf("%02x", $n);
3358 return '\\' . sprintf("%03o", $n);
3359 }
3360}
3361
3362sub collapse {
3363 my(@chars) = @_;
23db111c 3364 my($str, $c, $tr) = ("");
6e90668e
SM
3365 for ($c = 0; $c < @chars; $c++) {
3366 $tr = $chars[$c];
3367 $str .= pchr($tr);
3368 if ($c <= $#chars - 2 and $chars[$c + 1] == $tr + 1 and
3369 $chars[$c + 2] == $tr + 2)
3370 {
f4a44678
SM
3371 for (; $c <= $#chars-1 and $chars[$c + 1] == $chars[$c] + 1; $c++)
3372 {}
6e90668e
SM
3373 $str .= "-";
3374 $str .= pchr($chars[$c]);
3375 }
3376 }
3377 return $str;
3378}
3379
f4a44678
SM
3380sub tr_decode_byte {
3381 my($table, $flags) = @_;
2a9e2f8a 3382 my(@table) = unpack("s*", $table);
bec89253 3383 splice @table, 0x100, 1; # Number of subsequent elements
6e90668e
SM
3384 my($c, $tr, @from, @to, @delfrom, $delhyphen);
3385 if ($table[ord "-"] != -1 and
3386 $table[ord("-") - 1] == -1 || $table[ord("-") + 1] == -1)
3387 {
3388 $tr = $table[ord "-"];
3389 $table[ord "-"] = -1;
3390 if ($tr >= 0) {
3391 @from = ord("-");
3392 @to = $tr;
3393 } else { # -2 ==> delete
3394 $delhyphen = 1;
3395 }
3396 }
2a9e2f8a 3397 for ($c = 0; $c < @table; $c++) {
6e90668e
SM
3398 $tr = $table[$c];
3399 if ($tr >= 0) {
3400 push @from, $c; push @to, $tr;
3401 } elsif ($tr == -2) {
3402 push @delfrom, $c;
3403 }
3404 }
6e90668e 3405 @from = (@from, @delfrom);
f4a44678 3406 if ($flags & OPpTRANS_COMPLEMENT) {
6e90668e
SM
3407 my @newfrom = ();
3408 my %from;
3409 @from{@from} = (1) x @from;
3410 for ($c = 0; $c < 256; $c++) {
3411 push @newfrom, $c unless $from{$c};
3412 }
3413 @from = @newfrom;
3414 }
56d8b52c 3415 unless ($flags & OPpTRANS_DELETE || !@to) {
6e90668e
SM
3416 pop @to while $#to and $to[$#to] == $to[$#to -1];
3417 }
6e90668e
SM
3418 my($from, $to);
3419 $from = collapse(@from);
3420 $to = collapse(@to);
3421 $from .= "-" if $delhyphen;
f4a44678
SM
3422 return ($from, $to);
3423}
3424
3425sub tr_chr {
3426 my $x = shift;
3427 if ($x == ord "-") {
3428 return "\\-";
2a9e2f8a
RH
3429 } elsif ($x == ord "\\") {
3430 return "\\\\";
f4a44678
SM
3431 } else {
3432 return chr $x;
3433 }
3434}
3435
3436# XXX This doesn't yet handle all cases correctly either
3437
3438sub tr_decode_utf8 {
3439 my($swash_hv, $flags) = @_;
3440 my %swash = $swash_hv->ARRAY;
3441 my $final = undef;
3442 $final = $swash{'FINAL'}->IV if exists $swash{'FINAL'};
3443 my $none = $swash{"NONE"}->IV;
3444 my $extra = $none + 1;
3445 my(@from, @delfrom, @to);
3446 my $line;
3447 foreach $line (split /\n/, $swash{'LIST'}->PV) {
3448 my($min, $max, $result) = split(/\t/, $line);
3449 $min = hex $min;
3450 if (length $max) {
3451 $max = hex $max;
3452 } else {
3453 $max = $min;
3454 }
3455 $result = hex $result;
3456 if ($result == $extra) {
3457 push @delfrom, [$min, $max];
3458 } else {
3459 push @from, [$min, $max];
3460 push @to, [$result, $result + $max - $min];
3461 }
3462 }
3463 for my $i (0 .. $#from) {
3464 if ($from[$i][0] == ord '-') {
3465 unshift @from, splice(@from, $i, 1);
3466 unshift @to, splice(@to, $i, 1);
3467 last;
3468 } elsif ($from[$i][1] == ord '-') {
3469 $from[$i][1]--;
3470 $to[$i][1]--;
3471 unshift @from, ord '-';
3472 unshift @to, ord '-';
3473 last;
3474 }
3475 }
3476 for my $i (0 .. $#delfrom) {
3477 if ($delfrom[$i][0] == ord '-') {
3478 push @delfrom, splice(@delfrom, $i, 1);
3479 last;
3480 } elsif ($delfrom[$i][1] == ord '-') {
3481 $delfrom[$i][1]--;
3482 push @delfrom, ord '-';
3483 last;
3484 }
3485 }
3486 if (defined $final and $to[$#to][1] != $final) {
3487 push @to, [$final, $final];
3488 }
3489 push @from, @delfrom;
3490 if ($flags & OPpTRANS_COMPLEMENT) {
3491 my @newfrom;
3492 my $next = 0;
3493 for my $i (0 .. $#from) {
3494 push @newfrom, [$next, $from[$i][0] - 1];
3495 $next = $from[$i][1] + 1;
3496 }
3497 @from = ();
3498 for my $range (@newfrom) {
3499 if ($range->[0] <= $range->[1]) {
3500 push @from, $range;
3501 }
3502 }
3503 }
3504 my($from, $to, $diff);
3505 for my $chunk (@from) {
3506 $diff = $chunk->[1] - $chunk->[0];
3507 if ($diff > 1) {
3508 $from .= tr_chr($chunk->[0]) . "-" . tr_chr($chunk->[1]);
3509 } elsif ($diff == 1) {
3510 $from .= tr_chr($chunk->[0]) . tr_chr($chunk->[1]);
3511 } else {
3512 $from .= tr_chr($chunk->[0]);
3513 }
3514 }
3515 for my $chunk (@to) {
3516 $diff = $chunk->[1] - $chunk->[0];
3517 if ($diff > 1) {
3518 $to .= tr_chr($chunk->[0]) . "-" . tr_chr($chunk->[1]);
3519 } elsif ($diff == 1) {
3520 $to .= tr_chr($chunk->[0]) . tr_chr($chunk->[1]);
3521 } else {
3522 $to .= tr_chr($chunk->[0]);
3523 }
3524 }
3525 #$final = sprintf("%04x", $final) if defined $final;
3526 #$none = sprintf("%04x", $none) if defined $none;
3527 #$extra = sprintf("%04x", $extra) if defined $extra;
3528 #print STDERR "final: $final\n none: $none\nextra: $extra\n";
3529 #print STDERR $swash{'LIST'}->PV;
3530 return (escape_str($from), escape_str($to));
3531}
3532
3533sub pp_trans {
3534 my $self = shift;
3535 my($op, $cx) = @_;
3536 my($from, $to);
3537 if (class($op) eq "PVOP") {
3538 ($from, $to) = tr_decode_byte($op->pv, $op->private);
3539 } else { # class($op) eq "SVOP"
3540 ($from, $to) = tr_decode_utf8($op->sv->RV, $op->private);
3541 }
3542 my $flags = "";
3543 $flags .= "c" if $op->private & OPpTRANS_COMPLEMENT;
3544 $flags .= "d" if $op->private & OPpTRANS_DELETE;
3545 $to = "" if $from eq $to and $flags eq "";
3546 $flags .= "s" if $op->private & OPpTRANS_SQUASH;
6e90668e
SM
3547 return "tr" . double_delim($from, $to) . $flags;
3548}
3549
3550# Like dq(), but different
3551sub re_dq {
3552 my $self = shift;
a9760014
RH
3553 my ($op, $extended) = @_;
3554
3f872cb9
GS
3555 my $type = $op->name;
3556 if ($type eq "const") {
f3402b25 3557 return '$[' if $op->private & OPpCONST_ARYBASE;
a9760014
RH
3558 my $unbacked = re_unback($self->const_sv($op)->as_string);
3559 return re_uninterp_extended(escape_extended_re($unbacked))
3560 if $extended;
3561 return re_uninterp(escape_str($unbacked));
3f872cb9 3562 } elsif ($type eq "concat") {
a9760014
RH
3563 my $first = $self->re_dq($op->first, $extended);
3564 my $last = $self->re_dq($op->last, $extended);
b73b7152 3565
a0e66df8 3566 # Disambiguate "${foo}bar", "${foo}{bar}", "${foo}[1]"
b73b7152
JH
3567 ($last =~ /^[A-Z\\\^\[\]_?]/ &&
3568 $first =~ s/([\$@])\^$/${1}{^}/) # "${^}W" etc
3569 || ($last =~ /^[{\[\w_]/ &&
3570 $first =~ s/([\$@])([A-Za-z_]\w*)$/${1}{$2}/);
3571
a0e66df8 3572 return $first . $last;
3f872cb9 3573 } elsif ($type eq "uc") {
a9760014 3574 return '\U' . $self->re_dq($op->first->sibling, $extended) . '\E';
3f872cb9 3575 } elsif ($type eq "lc") {
a9760014 3576 return '\L' . $self->re_dq($op->first->sibling, $extended) . '\E';
3f872cb9 3577 } elsif ($type eq "ucfirst") {
a9760014 3578 return '\u' . $self->re_dq($op->first->sibling, $extended);
3f872cb9 3579 } elsif ($type eq "lcfirst") {
a9760014 3580 return '\l' . $self->re_dq($op->first->sibling, $extended);
3f872cb9 3581 } elsif ($type eq "quotemeta") {
a9760014 3582 return '\Q' . $self->re_dq($op->first->sibling, $extended) . '\E';
3f872cb9 3583 } elsif ($type eq "join") {
9d2c6865 3584 return $self->deparse($op->last, 26); # was join($", @ary)
6e90668e 3585 } else {
9d2c6865 3586 return $self->deparse($op, 26);
6e90668e
SM
3587 }
3588}
3589
a9760014
RH
3590sub pure_string {
3591 my ($self, $op) = @_;
3592 my $type = $op->name;
3593
3594 if ($type eq 'const') {
3595 return 1;
3596 }
3597 elsif ($type =~ /^[ul]c(first)?$/ || $type eq 'quotemeta') {
3598 return $self->pure_string($op->first->sibling);
3599 }
3600 elsif ($type eq 'join') {
3601 my $join_op = $op->first->sibling; # Skip pushmark
3602 return 0 unless $join_op->name eq 'null' && $join_op->targ eq OP_RV2SV;
3603
3604 my $gvop = $join_op->first;
3605 return 0 unless $gvop->name eq 'gvsv';
3606 return 0 unless '"' eq $self->gv_name($self->gv_or_padgv($gvop));
3607
3608 return 0 unless ${$join_op->sibling} eq ${$op->last};
3609