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Eliminate cop_label from struct cop by storing a label as the first
[perl5.git] / ext / B / B / Deparse.pm
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6e90668e 1# B::Deparse.pm
4ca8de37
SM
2# Copyright (c) 1998-2000, 2002, 2003, 2004, 2005, 2006 Stephen McCamant.
3# All rights reserved.
6e90668e
SM
4# This module is free software; you can redistribute and/or modify
5# it under the same terms as Perl itself.
6
7# This is based on the module of the same name by Malcolm Beattie,
8# but essentially none of his code remains.
9
a798dbf2 10package B::Deparse;
ff97752d 11use Carp;
51a5edaf 12use B qw(class main_root main_start main_cv svref_2object opnumber perlstring
bd0865ec 13 OPf_WANT OPf_WANT_VOID OPf_WANT_SCALAR OPf_WANT_LIST
3462b4ac 14 OPf_KIDS OPf_REF OPf_STACKED OPf_SPECIAL OPf_MOD OPpPAD_STATE
ce4e655d 15 OPpLVAL_INTRO OPpOUR_INTRO OPpENTERSUB_AMPER OPpSLICE OPpCONST_BARE
3ed82cfc 16 OPpTRANS_SQUASH OPpTRANS_DELETE OPpTRANS_COMPLEMENT OPpTARGET_MY
7e80da18 17 OPpCONST_ARYBASE OPpEXISTS_SUB OPpSORT_NUMERIC OPpSORT_INTEGER
36d57d93 18 OPpSORT_REVERSE OPpSORT_INPLACE OPpSORT_DESCEND OPpITER_REVERSED
d989cdac 19 SVf_IOK SVf_NOK SVf_ROK SVf_POK SVpad_OUR SVf_FAKE SVs_RMG SVs_SMG
584420f0 20 CVf_METHOD CVf_LOCKED CVf_LVALUE
c737faaf 21 PMf_KEEP PMf_GLOBAL PMf_CONTINUE PMf_EVAL PMf_ONCE
7c1f70cb
NC
22 PMf_MULTILINE PMf_SINGLELINE PMf_FOLD PMf_EXTENDED),
23 ($] < 5.009 ? 'PMf_SKIPWHITE' : 'RXf_SKIPWHITE');
dca6062a 24$VERSION = 0.87;
a798dbf2 25use strict;
2ae48fff 26use vars qw/$AUTOLOAD/;
34a48b4b 27use warnings ();
a798dbf2 28
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29# Changes between 0.50 and 0.51:
30# - fixed nulled leave with live enter in sort { }
31# - fixed reference constants (\"str")
32# - handle empty programs gracefully
33# - handle infinte loops (for (;;) {}, while (1) {})
34# - differentiate between `for my $x ...' and `my $x; for $x ...'
35# - various minor cleanups
36# - moved globals into an object
37# - added `-u', like B::C
38# - package declarations using cop_stash
39# - subs, formats and code sorted by cop_seq
f6f9bdb7 40# Changes between 0.51 and 0.52:
4d1ff10f 41# - added pp_threadsv (special variables under USE_5005THREADS)
f6f9bdb7 42# - added documentation
bd0865ec 43# Changes between 0.52 and 0.53:
9d2c6865
SM
44# - many changes adding precedence contexts and associativity
45# - added `-p' and `-s' output style options
46# - various other minor fixes
bd0865ec 47# Changes between 0.53 and 0.54:
d7f5b6da
SM
48# - added support for new `for (1..100)' optimization,
49# thanks to Gisle Aas
bd0865ec 50# Changes between 0.54 and 0.55:
90be192f
SM
51# - added support for new qr// construct
52# - added support for new pp_regcreset OP
bd0865ec 53# Changes between 0.55 and 0.56:
f5aa8f4e
SM
54# - tested on base/*.t, cmd/*.t, comp/*.t, io/*.t
55# - fixed $# on non-lexicals broken in last big rewrite
56# - added temporary fix for change in opcode of OP_STRINGIFY
57# - fixed problem in 0.54's for() patch in `for (@ary)'
58# - fixed precedence in conditional of ?:
59# - tweaked list paren elimination in `my($x) = @_'
60# - made continue-block detection trickier wrt. null ops
61# - fixed various prototype problems in pp_entersub
62# - added support for sub prototypes that never get GVs
63# - added unquoting for special filehandle first arg in truncate
64# - print doubled rv2gv (a bug) as `*{*GV}' instead of illegal `**GV'
65# - added semicolons at the ends of blocks
66# - added -l `#line' declaration option -- fixes cmd/subval.t 27,28
bd0865ec
GS
67# Changes between 0.56 and 0.561:
68# - fixed multiply-declared my var in pp_truncate (thanks to Sarathy)
69# - used new B.pm symbolic constants (done by Nick Ing-Simmons)
70# Changes between 0.561 and 0.57:
71# - stylistic changes to symbolic constant stuff
72# - handled scope in s///e replacement code
73# - added unquote option for expanding "" into concats, etc.
74# - split method and proto parts of pp_entersub into separate functions
75# - various minor cleanups
f4a44678
SM
76# Changes after 0.57:
77# - added parens in \&foo (patch by Albert Dvornik)
78# Changes between 0.57 and 0.58:
79# - fixed `0' statements that weren't being printed
80# - added methods for use from other programs
81# (based on patches from James Duncan and Hugo van der Sanden)
82# - added -si and -sT to control indenting (also based on a patch from Hugo)
83# - added -sv to print something else instead of '???'
84# - preliminary version of utf8 tr/// handling
3ed82cfc
GS
85# Changes after 0.58:
86# - uses of $op->ppaddr changed to new $op->name (done by Sarathy)
d989cdac 87# - added support for Hugo's new OP_SETSTATE (like nextstate)
3ed82cfc
GS
88# Changes between 0.58 and 0.59
89# - added support for Chip's OP_METHOD_NAMED
90# - added support for Ilya's OPpTARGET_MY optimization
91# - elided arrows before `()' subscripts when possible
58cccf98
SM
92# Changes between 0.59 and 0.60
93# - support for method attribues was added
94# - some warnings fixed
95# - separate recognition of constant subs
96# - rewrote continue block handling, now recoginizing for loops
97# - added more control of expanding control structures
c7f67cde
RH
98# Changes between 0.60 and 0.61 (mostly by Robin Houston)
99# - many bug-fixes
100# - support for pragmas and 'use'
101# - support for the little-used $[ variable
102# - support for __DATA__ sections
103# - UTF8 support
104# - BEGIN, CHECK, INIT and END blocks
105# - scoping of subroutine declarations fixed
106# - compile-time output from the input program can be suppressed, so that the
107# output is just the deparsed code. (a change to O.pm in fact)
108# - our() declarations
109# - *all* the known bugs are now listed in the BUGS section
110# - comprehensive test mechanism (TEST -deparse)
9a58b761
RGS
111# Changes between 0.62 and 0.63 (mostly by Rafael Garcia-Suarez)
112# - bug-fixes
113# - new switch -P
114# - support for command-line switches (-l, -0, etc.)
d989cdac
SM
115# Changes between 0.63 and 0.64
116# - support for //, CHECK blocks, and assertions
117# - improved handling of foreach loops and lexicals
118# - option to use Data::Dumper for constants
119# - more bug fixes
120# - discovered lots more bugs not yet fixed
0d863452
RH
121#
122# ...
123#
124# Changes between 0.72 and 0.73
125# - support new switch constructs
6e90668e
SM
126
127# Todo:
2a9e2f8a
RH
128# (See also BUGS section at the end of this file)
129#
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SM
130# - finish tr/// changes
131# - add option for even more parens (generalize \&foo change)
90be192f 132# - left/right context
58cccf98 133# - copy comments (look at real text with $^P?)
f5aa8f4e 134# - avoid semis in one-statement blocks
9d2c6865 135# - associativity of &&=, ||=, ?:
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SM
136# - ',' => '=>' (auto-unquote?)
137# - break long lines ("\r" as discretionary break?)
f4a44678
SM
138# - configurable syntax highlighting: ANSI color, HTML, TeX, etc.
139# - more style options: brace style, hex vs. octal, quotes, ...
140# - print big ints as hex/octal instead of decimal (heuristic?)
3ed82cfc 141# - handle `my $x if 0'?
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SM
142# - version using op_next instead of op_first/sibling?
143# - avoid string copies (pass arrays, one big join?)
9d2c6865 144# - here-docs?
6e90668e 145
d989cdac 146# Current test.deparse failures
d989cdac
SM
147# comp/hints 6 - location of BEGIN blocks wrt. block openings
148# run/switchI 1 - missing -I switches entirely
149# perl -Ifoo -e 'print @INC'
150# op/caller 2 - warning mask propagates backwards before warnings::register
151# 'use warnings; BEGIN {${^WARNING_BITS} eq "U"x12;} use warnings::register'
152# op/getpid 2 - can't assign to shared my() declaration (threads only)
153# 'my $x : shared = 5'
154# op/override 7 - parens on overriden require change v-string interpretation
155# 'BEGIN{*CORE::GLOBAL::require=sub {}} require v5.6'
156# c.f. 'BEGIN { *f = sub {0} }; f 2'
157# op/pat 774 - losing Unicode-ness of Latin1-only strings
158# 'use charnames ":short"; $x="\N{latin:a with acute}"'
159# op/recurse 12 - missing parens on recursive call makes it look like method
160# 'sub f { f($x) }'
161# op/subst 90 - inconsistent handling of utf8 under "use utf8"
162# op/taint 29 - "use re 'taint'" deparsed in the wrong place wrt. block open
163# op/tiehandle compile - "use strict" deparsed in the wrong place
164# uni/tr_ several
165# ext/B/t/xref 11 - line numbers when we add newlines to one-line subs
166# ext/Data/Dumper/t/dumper compile
167# ext/DB_file/several
168# ext/Encode/several
169# ext/Ernno/Errno warnings
170# ext/IO/lib/IO/t/io_sel 23
171# ext/PerlIO/t/encoding compile
172# ext/POSIX/t/posix 6
173# ext/Socket/Socket 8
174# ext/Storable/t/croak compile
175# lib/Attribute/Handlers/t/multi compile
176# lib/bignum/ several
177# lib/charnames 35
178# lib/constant 32
179# lib/English 40
180# lib/ExtUtils/t/bytes 4
181# lib/File/DosGlob compile
182# lib/Filter/Simple/t/data 1
183# lib/Math/BigInt/t/constant 1
184# lib/Net/t/config Deparse-warning
185# lib/overload compile
186# lib/Switch/ several
187# lib/Symbol 4
188# lib/Test/Simple several
189# lib/Term/Complete
190# lib/Tie/File/t/29_downcopy 5
191# lib/vars 22
f5aa8f4e 192
6e90668e
SM
193# Object fields (were globals):
194#
195# avoid_local:
196# (local($a), local($b)) and local($a, $b) have the same internal
197# representation but the short form looks better. We notice we can
198# use a large-scale local when checking the list, but need to prevent
d989cdac 199# individual locals too. This hash holds the addresses of OPs that
6e90668e
SM
200# have already had their local-ness accounted for. The same thing
201# is done with my().
202#
203# curcv:
204# CV for current sub (or main program) being deparsed
205#
8510e997
RH
206# curcvlex:
207# Cached hash of lexical variables for curcv: keys are names,
208# each value is an array of pairs, indicating the cop_seq of scopes
209# in which a var of that name is valid.
210#
34a48b4b
RH
211# curcop:
212# COP for statement being deparsed
213#
6e90668e
SM
214# curstash:
215# name of the current package for deparsed code
216#
217# subs_todo:
34a48b4b 218# array of [cop_seq, CV, is_format?] for subs and formats we still
6e90668e
SM
219# want to deparse
220#
f5aa8f4e
SM
221# protos_todo:
222# as above, but [name, prototype] for subs that never got a GV
223#
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SM
224# subs_done, forms_done:
225# keys are addresses of GVs for subs and formats we've already
226# deparsed (or at least put into subs_todo)
9d2c6865 227#
0ca62a8e
RH
228# subs_declared
229# keys are names of subs for which we've printed declarations.
230# That means we can omit parentheses from the arguments.
231#
1d38190f
RGS
232# subs_deparsed
233# Keeps track of fully qualified names of all deparsed subs.
234#
9d2c6865 235# parens: -p
f5aa8f4e 236# linenums: -l
bd0865ec 237# unquote: -q
9d2c6865 238# cuddle: ` ' or `\n', depending on -sC
f4a44678
SM
239# indent_size: -si
240# use_tabs: -sT
241# ex_const: -sv
9d2c6865
SM
242
243# A little explanation of how precedence contexts and associativity
244# work:
245#
246# deparse() calls each per-op subroutine with an argument $cx (short
247# for context, but not the same as the cx* in the perl core), which is
248# a number describing the op's parents in terms of precedence, whether
f5aa8f4e 249# they're inside an expression or at statement level, etc. (see
9d2c6865
SM
250# chart below). When ops with children call deparse on them, they pass
251# along their precedence. Fractional values are used to implement
252# associativity (`($x + $y) + $z' => `$x + $y + $y') and related
253# parentheses hacks. The major disadvantage of this scheme is that
254# it doesn't know about right sides and left sides, so say if you
255# assign a listop to a variable, it can't tell it's allowed to leave
256# the parens off the listop.
257
258# Precedences:
259# 26 [TODO] inside interpolation context ("")
260# 25 left terms and list operators (leftward)
261# 24 left ->
262# 23 nonassoc ++ --
263# 22 right **
264# 21 right ! ~ \ and unary + and -
265# 20 left =~ !~
266# 19 left * / % x
267# 18 left + - .
268# 17 left << >>
269# 16 nonassoc named unary operators
270# 15 nonassoc < > <= >= lt gt le ge
271# 14 nonassoc == != <=> eq ne cmp
272# 13 left &
273# 12 left | ^
274# 11 left &&
275# 10 left ||
276# 9 nonassoc .. ...
277# 8 right ?:
278# 7 right = += -= *= etc.
279# 6 left , =>
280# 5 nonassoc list operators (rightward)
281# 4 right not
282# 3 left and
283# 2 left or xor
284# 1 statement modifiers
d989cdac 285# 0.5 statements, but still print scopes as do { ... }
9d2c6865
SM
286# 0 statement level
287
288# Nonprinting characters with special meaning:
289# \cS - steal parens (see maybe_parens_unop)
290# \n - newline and indent
291# \t - increase indent
292# \b - decrease indent (`outdent')
f5aa8f4e 293# \f - flush left (no indent)
9d2c6865 294# \cK - kill following semicolon, if any
6e90668e
SM
295
296sub null {
297 my $op = shift;
298 return class($op) eq "NULL";
299}
300
301sub todo {
302 my $self = shift;
34a48b4b 303 my($cv, $is_form) = @_;
e31885a0 304 return unless ($cv->FILE eq $0 || exists $self->{files}{$cv->FILE});
6e90668e 305 my $seq;
d989cdac
SM
306 if ($cv->OUTSIDE_SEQ) {
307 $seq = $cv->OUTSIDE_SEQ;
308 } elsif (!null($cv->START) and is_state($cv->START)) {
6e90668e
SM
309 $seq = $cv->START->cop_seq;
310 } else {
311 $seq = 0;
312 }
34a48b4b 313 push @{$self->{'subs_todo'}}, [$seq, $cv, $is_form];
1d38190f
RGS
314 unless ($is_form || class($cv->STASH) eq 'SPECIAL') {
315 $self->{'subs_deparsed'}{$cv->STASH->NAME."::".$cv->GV->NAME} = 1;
316 }
6e90668e
SM
317}
318
319sub next_todo {
320 my $self = shift;
321 my $ent = shift @{$self->{'subs_todo'}};
34a48b4b
RH
322 my $cv = $ent->[1];
323 my $gv = $cv->GV;
324 my $name = $self->gv_name($gv);
6e90668e
SM
325 if ($ent->[2]) {
326 return "format $name =\n"
e31885a0 327 . $self->deparse_format($ent->[1]). "\n";
6e90668e 328 } else {
0ca62a8e 329 $self->{'subs_declared'}{$name} = 1;
34a48b4b
RH
330 if ($name eq "BEGIN") {
331 my $use_dec = $self->begin_is_use($cv);
d989cdac 332 if (defined ($use_dec) and $self->{'expand'} < 5) {
0e7fe0f0
RH
333 return () if 0 == length($use_dec);
334 return $use_dec;
335 }
34a48b4b 336 }
a0035eb8
RH
337 my $l = '';
338 if ($self->{'linenums'}) {
339 my $line = $gv->LINE;
340 my $file = $gv->FILE;
341 $l = "\n\f#line $line \"$file\"\n";
342 }
127212b2
DM
343 my $p = '';
344 if (class($cv->STASH) ne "SPECIAL") {
345 my $stash = $cv->STASH->NAME;
346 if ($stash ne $self->{'curstash'}) {
347 $p = "package $stash;\n";
348 $name = "$self->{'curstash'}::$name" unless $name =~ /::/;
349 $self->{'curstash'} = $stash;
350 }
8b2d6640 351 $name =~ s/^\Q$stash\E::(?!\z|.*::)//;
127212b2
DM
352 }
353 return "${p}${l}sub $name " . $self->deparse_sub($cv);
34a48b4b
RH
354 }
355}
356
357# Return a "use" declaration for this BEGIN block, if appropriate
358sub begin_is_use {
359 my ($self, $cv) = @_;
360 my $root = $cv->ROOT;
80dc0729 361 local @$self{qw'curcv curcvlex'} = ($cv);
34a48b4b
RH
362#require B::Debug;
363#B::walkoptree($cv->ROOT, "debug");
364 my $lineseq = $root->first;
365 return if $lineseq->name ne "lineseq";
366
367 my $req_op = $lineseq->first->sibling;
368 return if $req_op->name ne "require";
369
370 my $module;
371 if ($req_op->first->private & OPpCONST_BARE) {
372 # Actually it should always be a bareword
373 $module = $self->const_sv($req_op->first)->PV;
374 $module =~ s[/][::]g;
375 $module =~ s/.pm$//;
376 }
377 else {
d989cdac 378 $module = $self->const($self->const_sv($req_op->first), 6);
34a48b4b
RH
379 }
380
381 my $version;
382 my $version_op = $req_op->sibling;
383 return if class($version_op) eq "NULL";
384 if ($version_op->name eq "lineseq") {
385 # We have a version parameter; skip nextstate & pushmark
386 my $constop = $version_op->first->next->next;
387
388 return unless $self->const_sv($constop)->PV eq $module;
389 $constop = $constop->sibling;
a58644de 390 $version = $self->const_sv($constop);
d989cdac
SM
391 if (class($version) eq "IV") {
392 $version = $version->int_value;
393 } elsif (class($version) eq "NV") {
394 $version = $version->NV;
395 } elsif (class($version) ne "PVMG") {
396 # Includes PVIV and PVNV
a58644de
RGS
397 $version = $version->PV;
398 } else {
399 # version specified as a v-string
400 $version = 'v'.join '.', map ord, split //, $version->PV;
401 }
34a48b4b
RH
402 $constop = $constop->sibling;
403 return if $constop->name ne "method_named";
404 return if $self->const_sv($constop)->PV ne "VERSION";
405 }
406
407 $lineseq = $version_op->sibling;
408 return if $lineseq->name ne "lineseq";
409 my $entersub = $lineseq->first->sibling;
410 if ($entersub->name eq "stub") {
411 return "use $module $version ();\n" if defined $version;
412 return "use $module ();\n";
413 }
414 return if $entersub->name ne "entersub";
415
416 # See if there are import arguments
417 my $args = '';
418
6ec152c3
RH
419 my $svop = $entersub->first->sibling; # Skip over pushmark
420 return unless $self->const_sv($svop)->PV eq $module;
34a48b4b
RH
421
422 # Pull out the arguments
6ec152c3
RH
423 for ($svop=$svop->sibling; $svop->name ne "method_named";
424 $svop = $svop->sibling) {
34a48b4b 425 $args .= ", " if length($args);
6ec152c3 426 $args .= $self->deparse($svop, 6);
34a48b4b
RH
427 }
428
429 my $use = 'use';
6ec152c3 430 my $method_named = $svop;
34a48b4b
RH
431 return if $method_named->name ne "method_named";
432 my $method_name = $self->const_sv($method_named)->PV;
433
434 if ($method_name eq "unimport") {
435 $use = 'no';
436 }
437
438 # Certain pragmas are dealt with using hint bits,
439 # so we ignore them here
440 if ($module eq 'strict' || $module eq 'integer'
0ced6c29
RGS
441 || $module eq 'bytes' || $module eq 'warnings'
442 || $module eq 'feature') {
34a48b4b
RH
443 return "";
444 }
445
446 if (defined $version && length $args) {
447 return "$use $module $version ($args);\n";
448 } elsif (defined $version) {
449 return "$use $module $version;\n";
450 } elsif (length $args) {
451 return "$use $module ($args);\n";
452 } else {
453 return "$use $module;\n";
6e90668e
SM
454 }
455}
456
6e90668e 457sub stash_subs {
34a48b4b
RH
458 my ($self, $pack) = @_;
459 my (@ret, $stash);
460 if (!defined $pack) {
461 $pack = '';
462 $stash = \%::;
f5aa8f4e 463 }
34a48b4b
RH
464 else {
465 $pack =~ s/(::)?$/::/;
466 no strict 'refs';
467 $stash = \%$pack;
468 }
469 my %stash = svref_2object($stash)->ARRAY;
470 while (my ($key, $val) = each %stash) {
f5aa8f4e
SM
471 my $class = class($val);
472 if ($class eq "PV") {
a0035eb8
RH
473 # Just a prototype. As an ugly but fairly effective way
474 # to find out if it belongs here is to see if the AUTOLOAD
475 # (if any) for the stash was defined in one of our files.
476 my $A = $stash{"AUTOLOAD"};
477 if (defined ($A) && class($A) eq "GV" && defined($A->CV)
478 && class($A->CV) eq "CV") {
479 my $AF = $A->FILE;
480 next unless $AF eq $0 || exists $self->{'files'}{$AF};
481 }
f5aa8f4e
SM
482 push @{$self->{'protos_todo'}}, [$pack . $key, $val->PV];
483 } elsif ($class eq "IV") {
a0035eb8
RH
484 # Just a name. As above.
485 my $A = $stash{"AUTOLOAD"};
486 if (defined ($A) && class($A) eq "GV" && defined($A->CV)
487 && class($A->CV) eq "CV") {
488 my $AF = $A->FILE;
489 next unless $AF eq $0 || exists $self->{'files'}{$AF};
490 }
d989cdac 491 push @{$self->{'protos_todo'}}, [$pack . $key, undef];
f5aa8f4e 492 } elsif ($class eq "GV") {
34a48b4b 493 if (class(my $cv = $val->CV) ne "SPECIAL") {
f5aa8f4e 494 next if $self->{'subs_done'}{$$val}++;
e31885a0 495 next if $$val != ${$cv->GV}; # Ignore imposters
8510e997 496 $self->todo($cv, 0);
f5aa8f4e 497 }
e31885a0 498 if (class(my $cv = $val->FORM) ne "SPECIAL") {
f5aa8f4e 499 next if $self->{'forms_done'}{$$val}++;
e31885a0
RH
500 next if $$val != ${$cv->GV}; # Ignore imposters
501 $self->todo($cv, 1);
f5aa8f4e 502 }
34a48b4b 503 if (class($val->HV) ne "SPECIAL" && $key =~ /::$/) {
8b2d6640
FC
504 $self->stash_subs($pack . $key)
505 unless $pack eq '' && $key eq 'main::';
506 # avoid infinite recursion
34a48b4b 507 }
6e90668e
SM
508 }
509 }
510}
a798dbf2 511
f5aa8f4e
SM
512sub print_protos {
513 my $self = shift;
514 my $ar;
515 my @ret;
516 foreach $ar (@{$self->{'protos_todo'}}) {
517 my $proto = (defined $ar->[1] ? " (". $ar->[1] . ")" : "");
518 push @ret, "sub " . $ar->[0] . "$proto;\n";
519 }
520 delete $self->{'protos_todo'};
521 return @ret;
522}
523
9d2c6865
SM
524sub style_opts {
525 my $self = shift;
526 my $opts = shift;
527 my $opt;
528 while (length($opt = substr($opts, 0, 1))) {
529 if ($opt eq "C") {
530 $self->{'cuddle'} = " ";
f4a44678
SM
531 $opts = substr($opts, 1);
532 } elsif ($opt eq "i") {
533 $opts =~ s/^i(\d+)//;
534 $self->{'indent_size'} = $1;
535 } elsif ($opt eq "T") {
536 $self->{'use_tabs'} = 1;
537 $opts = substr($opts, 1);
538 } elsif ($opt eq "v") {
539 $opts =~ s/^v([^.]*)(.|$)//;
540 $self->{'ex_const'} = $1;
9d2c6865 541 }
9d2c6865
SM
542 }
543}
544
f4a44678
SM
545sub new {
546 my $class = shift;
547 my $self = bless {}, $class;
f4a44678 548 $self->{'cuddle'} = "\n";
d989cdac
SM
549 $self->{'curcop'} = undef;
550 $self->{'curstash'} = "main";
551 $self->{'ex_const'} = "'???'";
793e2a70 552 $self->{'expand'} = 0;
d989cdac
SM
553 $self->{'files'} = {};
554 $self->{'indent_size'} = 4;
793e2a70
RH
555 $self->{'linenums'} = 0;
556 $self->{'parens'} = 0;
d989cdac
SM
557 $self->{'subs_todo'} = [];
558 $self->{'unquote'} = 0;
559 $self->{'use_dumper'} = 0;
560 $self->{'use_tabs'} = 0;
08c6f5ec
RH
561
562 $self->{'ambient_arybase'} = 0;
e31885a0 563 $self->{'ambient_warnings'} = undef; # Assume no lexical warnings
a0405c92 564 $self->{'ambient_hints'} = 0;
0ced6c29 565 $self->{'ambient_hinthash'} = undef;
08c6f5ec
RH
566 $self->init();
567
f4a44678 568 while (my $arg = shift @_) {
d989cdac
SM
569 if ($arg eq "-d") {
570 $self->{'use_dumper'} = 1;
571 require Data::Dumper;
572 } elsif ($arg =~ /^-f(.*)/) {
34a48b4b 573 $self->{'files'}{$1} = 1;
d989cdac
SM
574 } elsif ($arg eq "-l") {
575 $self->{'linenums'} = 1;
f4a44678
SM
576 } elsif ($arg eq "-p") {
577 $self->{'parens'} = 1;
acaaef34
RGS
578 } elsif ($arg eq "-P") {
579 $self->{'noproto'} = 1;
f4a44678
SM
580 } elsif ($arg eq "-q") {
581 $self->{'unquote'} = 1;
582 } elsif (substr($arg, 0, 2) eq "-s") {
583 $self->style_opts(substr $arg, 2);
58cccf98
SM
584 } elsif ($arg =~ /^-x(\d)$/) {
585 $self->{'expand'} = $1;
f4a44678
SM
586 }
587 }
588 return $self;
589}
590
810aef70
RH
591{
592 # Mask out the bits that L<warnings::register> uses
593 my $WARN_MASK;
594 BEGIN {
595 $WARN_MASK = $warnings::Bits{all} | $warnings::DeadBits{all};
596 }
597 sub WARN_MASK () {
598 return $WARN_MASK;
599 }
34a48b4b
RH
600}
601
08c6f5ec
RH
602# Initialise the contextual information, either from
603# defaults provided with the ambient_pragmas method,
604# or from perl's own defaults otherwise.
605sub init {
606 my $self = shift;
607
608 $self->{'arybase'} = $self->{'ambient_arybase'};
e31885a0
RH
609 $self->{'warnings'} = defined ($self->{'ambient_warnings'})
610 ? $self->{'ambient_warnings'} & WARN_MASK
611 : undef;
d5ec2987 612 $self->{'hints'} = $self->{'ambient_hints'};
e412117e 613 $self->{'hints'} &= 0xFF if $] < 5.009;
0ced6c29 614 $self->{'hinthash'} = $self->{'ambient_hinthash'};
217aba5d
RH
615
616 # also a convenient place to clear out subs_declared
617 delete $self->{'subs_declared'};
08c6f5ec
RH
618}
619
a798dbf2 620sub compile {
6e90668e 621 my(@args) = @_;
d989cdac 622 return sub {
f4a44678 623 my $self = B::Deparse->new(@args);
d2bc402e
RGS
624 # First deparse command-line args
625 if (defined $^I) { # deparse -i
51a5edaf 626 print q(BEGIN { $^I = ).perlstring($^I).qq(; }\n);
d2bc402e
RGS
627 }
628 if ($^W) { # deparse -w
629 print qq(BEGIN { \$^W = $^W; }\n);
630 }
631 if ($/ ne "\n" or defined $O::savebackslash) { # deparse -l and -0
51a5edaf
RGS
632 my $fs = perlstring($/) || 'undef';
633 my $bs = perlstring($O::savebackslash) || 'undef';
d2bc402e
RGS
634 print qq(BEGIN { \$/ = $fs; \$\\ = $bs; }\n);
635 }
34a48b4b 636 my @BEGINs = B::begin_av->isa("B::AV") ? B::begin_av->ARRAY : ();
676456c2
AG
637 my @UNITCHECKs = B::unitcheck_av->isa("B::AV")
638 ? B::unitcheck_av->ARRAY
639 : ();
ece599bd 640 my @CHECKs = B::check_av->isa("B::AV") ? B::check_av->ARRAY : ();
34a48b4b
RH
641 my @INITs = B::init_av->isa("B::AV") ? B::init_av->ARRAY : ();
642 my @ENDs = B::end_av->isa("B::AV") ? B::end_av->ARRAY : ();
676456c2 643 for my $block (@BEGINs, @UNITCHECKs, @CHECKs, @INITs, @ENDs) {
e31885a0 644 $self->todo($block, 0);
34a48b4b
RH
645 }
646 $self->stash_subs();
d989cdac
SM
647 local($SIG{"__DIE__"}) =
648 sub {
649 if ($self->{'curcop'}) {
650 my $cop = $self->{'curcop'};
651 my($line, $file) = ($cop->line, $cop->file);
652 print STDERR "While deparsing $file near line $line,\n";
653 }
654 };
6e90668e 655 $self->{'curcv'} = main_cv;
8510e997 656 $self->{'curcvlex'} = undef;
f5aa8f4e 657 print $self->print_protos;
6e90668e 658 @{$self->{'subs_todo'}} =
f4a44678 659 sort {$a->[0] <=> $b->[0]} @{$self->{'subs_todo'}};
d989cdac 660 print $self->indent($self->deparse_root(main_root)), "\n"
f4a44678 661 unless null main_root;
6e90668e
SM
662 my @text;
663 while (scalar(@{$self->{'subs_todo'}})) {
664 push @text, $self->next_todo;
665 }
6f611a1a 666 print $self->indent(join("", @text)), "\n" if @text;
e31885a0
RH
667
668 # Print __DATA__ section, if necessary
669 no strict 'refs';
96c57f7e
RGS
670 my $laststash = defined $self->{'curcop'}
671 ? $self->{'curcop'}->stash->NAME : $self->{'curstash'};
672 if (defined *{$laststash."::DATA"}{IO}) {
127212b2
DM
673 print "package $laststash;\n"
674 unless $laststash eq $self->{'curstash'};
e31885a0 675 print "__DATA__\n";
96c57f7e 676 print readline(*{$laststash."::DATA"});
e31885a0 677 }
a798dbf2 678 }
a798dbf2
MB
679}
680
f4a44678
SM
681sub coderef2text {
682 my $self = shift;
683 my $sub = shift;
0853f172 684 croak "Usage: ->coderef2text(CODEREF)" unless UNIVERSAL::isa($sub, "CODE");
08c6f5ec
RH
685
686 $self->init();
f4a44678
SM
687 return $self->indent($self->deparse_sub(svref_2object($sub)));
688}
689
08c6f5ec
RH
690sub ambient_pragmas {
691 my $self = shift;
0ced6c29 692 my ($arybase, $hint_bits, $warning_bits, $hinthash) = (0, 0);
08c6f5ec
RH
693
694 while (@_ > 1) {
695 my $name = shift();
696 my $val = shift();
697
698 if ($name eq 'strict') {
699 require strict;
700
701 if ($val eq 'none') {
702 $hint_bits &= ~strict::bits(qw/refs subs vars/);
703 next();
704 }
705
706 my @names;
707 if ($val eq "all") {
708 @names = qw/refs subs vars/;
709 }
710 elsif (ref $val) {
711 @names = @$val;
712 }
713 else {
a0405c92 714 @names = split' ', $val;
08c6f5ec
RH
715 }
716 $hint_bits |= strict::bits(@names);
717 }
718
719 elsif ($name eq '$[') {
720 $arybase = $val;
721 }
722
a0405c92
RH
723 elsif ($name eq 'integer'
724 || $name eq 'bytes'
725 || $name eq 'utf8') {
726 require "$name.pm";
08c6f5ec 727 if ($val) {
a0405c92
RH
728 $hint_bits |= ${$::{"${name}::"}{"hint_bits"}};
729 }
730 else {
731 $hint_bits &= ~${$::{"${name}::"}{"hint_bits"}};
732 }
733 }
734
735 elsif ($name eq 're') {
736 require re;
737 if ($val eq 'none') {
2570cdf1 738 $hint_bits &= ~re::bits(qw/taint eval/);
a0405c92
RH
739 next();
740 }
741
742 my @names;
743 if ($val eq 'all') {
2570cdf1 744 @names = qw/taint eval/;
a0405c92
RH
745 }
746 elsif (ref $val) {
747 @names = @$val;
08c6f5ec
RH
748 }
749 else {
a0405c92 750 @names = split' ',$val;
08c6f5ec 751 }
a0405c92 752 $hint_bits |= re::bits(@names);
08c6f5ec
RH
753 }
754
755 elsif ($name eq 'warnings') {
08c6f5ec 756 if ($val eq 'none') {
810aef70 757 $warning_bits = $warnings::NONE;
08c6f5ec
RH
758 next();
759 }
760
761 my @names;
762 if (ref $val) {
763 @names = @$val;
764 }
765 else {
766 @names = split/\s+/, $val;
767 }
768
810aef70 769 $warning_bits = $warnings::NONE if !defined ($warning_bits);
08c6f5ec
RH
770 $warning_bits |= warnings::bits(@names);
771 }
772
773 elsif ($name eq 'warning_bits') {
774 $warning_bits = $val;
775 }
776
777 elsif ($name eq 'hint_bits') {
778 $hint_bits = $val;
779 }
780
0ced6c29
RGS
781 elsif ($name eq '%^H') {
782 $hinthash = $val;
783 }
784
08c6f5ec
RH
785 else {
786 croak "Unknown pragma type: $name";
787 }
788 }
789 if (@_) {
790 croak "The ambient_pragmas method expects an even number of args";
791 }
792
793 $self->{'ambient_arybase'} = $arybase;
794 $self->{'ambient_warnings'} = $warning_bits;
a0405c92 795 $self->{'ambient_hints'} = $hint_bits;
0ced6c29 796 $self->{'ambient_hinthash'} = $hinthash;
08c6f5ec
RH
797}
798
d989cdac 799# This method is the inner loop, so try to keep it simple
6e90668e
SM
800sub deparse {
801 my $self = shift;
d989cdac 802 my($op, $cx) = @_;
34a48b4b
RH
803
804 Carp::confess("Null op in deparse") if !defined($op)
805 || class($op) eq "NULL";
3f872cb9 806 my $meth = "pp_" . $op->name;
9d2c6865 807 return $self->$meth($op, $cx);
a798dbf2
MB
808}
809
6e90668e 810sub indent {
f4a44678 811 my $self = shift;
6e90668e
SM
812 my $txt = shift;
813 my @lines = split(/\n/, $txt);
814 my $leader = "";
f4a44678 815 my $level = 0;
6e90668e
SM
816 my $line;
817 for $line (@lines) {
f4a44678
SM
818 my $cmd = substr($line, 0, 1);
819 if ($cmd eq "\t" or $cmd eq "\b") {
820 $level += ($cmd eq "\t" ? 1 : -1) * $self->{'indent_size'};
821 if ($self->{'use_tabs'}) {
822 $leader = "\t" x ($level / 8) . " " x ($level % 8);
823 } else {
824 $leader = " " x $level;
825 }
6e90668e
SM
826 $line = substr($line, 1);
827 }
f5aa8f4e
SM
828 if (substr($line, 0, 1) eq "\f") {
829 $line = substr($line, 1); # no indent
830 } else {
831 $line = $leader . $line;
832 }
9d2c6865 833 $line =~ s/\cK;?//g;
6e90668e
SM
834 }
835 return join("\n", @lines);
836}
837
6e90668e
SM
838sub deparse_sub {
839 my $self = shift;
840 my $cv = shift;
841 my $proto = "";
ce4e655d 842Carp::confess("NULL in deparse_sub") if !defined($cv) || $cv->isa("B::NULL");
34a48b4b
RH
843Carp::confess("SPECIAL in deparse_sub") if $cv->isa("B::SPECIAL");
844 local $self->{'curcop'} = $self->{'curcop'};
6e90668e
SM
845 if ($cv->FLAGS & SVf_POK) {
846 $proto = "(". $cv->PV . ") ";
847 }
584420f0 848 if ($cv->CvFLAGS & (CVf_METHOD|CVf_LOCKED|CVf_LVALUE)) {
6aaf4108
SC
849 $proto .= ": ";
850 $proto .= "lvalue " if $cv->CvFLAGS & CVf_LVALUE;
851 $proto .= "locked " if $cv->CvFLAGS & CVf_LOCKED;
852 $proto .= "method " if $cv->CvFLAGS & CVf_METHOD;
853 }
854
6e90668e 855 local($self->{'curcv'}) = $cv;
8510e997 856 local($self->{'curcvlex'});
0ced6c29
RGS
857 local(@$self{qw'curstash warnings hints hinthash'})
858 = @$self{qw'curstash warnings hints hinthash'};
ce4e655d 859 my $body;
6e90668e 860 if (not null $cv->ROOT) {
ce4e655d
RH
861 my $lineseq = $cv->ROOT->first;
862 if ($lineseq->name eq "lineseq") {
863 my @ops;
864 for(my$o=$lineseq->first; $$o; $o=$o->sibling) {
865 push @ops, $o;
866 }
867 $body = $self->lineseq(undef, @ops).";";
868 my $scope_en = $self->find_scope_en($lineseq);
869 if (defined $scope_en) {
870 my $subs = join"", $self->seq_subs($scope_en);
871 $body .= ";\n$subs" if length($subs);
872 }
873 }
874 else {
875 $body = $self->deparse($cv->ROOT->first, 0);
876 }
de3f1649 877 }
ce4e655d
RH
878 else {
879 my $sv = $cv->const_sv;
880 if ($$sv) {
881 # uh-oh. inlinable sub... format it differently
d989cdac 882 return $proto . "{ " . $self->const($sv, 0) . " }\n";
ce4e655d
RH
883 } else { # XSUB? (or just a declaration)
884 return "$proto;\n";
885 }
6e90668e 886 }
ce4e655d 887 return $proto ."{\n\t$body\n\b}" ."\n";
6e90668e
SM
888}
889
890sub deparse_format {
891 my $self = shift;
892 my $form = shift;
893 my @text;
894 local($self->{'curcv'}) = $form;
8510e997 895 local($self->{'curcvlex'});
67fc2416 896 local($self->{'in_format'}) = 1;
0ced6c29
RGS
897 local(@$self{qw'curstash warnings hints hinthash'})
898 = @$self{qw'curstash warnings hints hinthash'};
6e90668e
SM
899 my $op = $form->ROOT;
900 my $kid;
fb725297
RGS
901 return "\f." if $op->first->name eq 'stub'
902 || $op->first->name eq 'nextstate';
6e90668e
SM
903 $op = $op->first->first; # skip leavewrite, lineseq
904 while (not null $op) {
905 $op = $op->sibling; # skip nextstate
906 my @exprs;
907 $kid = $op->first->sibling; # skip pushmark
a5b0cd91 908 push @text, "\f".$self->const_sv($kid)->PV;
6e90668e
SM
909 $kid = $kid->sibling;
910 for (; not null $kid; $kid = $kid->sibling) {
9d2c6865 911 push @exprs, $self->deparse($kid, 0);
6e90668e 912 }
a5b0cd91 913 push @text, "\f".join(", ", @exprs)."\n" if @exprs;
6e90668e
SM
914 $op = $op->sibling;
915 }
a5b0cd91 916 return join("", @text) . "\f.";
6e90668e
SM
917}
918
6e90668e 919sub is_scope {
a798dbf2 920 my $op = shift;
3f872cb9
GS
921 return $op->name eq "leave" || $op->name eq "scope"
922 || $op->name eq "lineseq"
d989cdac 923 || ($op->name eq "null" && class($op) eq "UNOP"
3f872cb9 924 && (is_scope($op->first) || $op->first->name eq "enter"));
6e90668e
SM
925}
926
927sub is_state {
3f872cb9
GS
928 my $name = $_[0]->name;
929 return $name eq "nextstate" || $name eq "dbstate" || $name eq "setstate";
6e90668e
SM
930}
931
932sub is_miniwhile { # check for one-line loop (`foo() while $y--')
933 my $op = shift;
d989cdac 934 return (!null($op) and null($op->sibling)
3f872cb9
GS
935 and $op->name eq "null" and class($op) eq "UNOP"
936 and (($op->first->name =~ /^(and|or)$/
937 and $op->first->first->sibling->name eq "lineseq")
938 or ($op->first->name eq "lineseq"
6e90668e 939 and not null $op->first->first->sibling
3f872cb9 940 and $op->first->first->sibling->name eq "unstack")
6e90668e
SM
941 ));
942}
943
d989cdac
SM
944# Check if the op and its sibling are the initialization and the rest of a
945# for (..;..;..) { ... } loop
946sub is_for_loop {
947 my $op = shift;
948 # This OP might be almost anything, though it won't be a
949 # nextstate. (It's the initialization, so in the canonical case it
950 # will be an sassign.) The sibling is a lineseq whose first child
951 # is a nextstate and whose second is a leaveloop.
952 my $lseq = $op->sibling;
953 if (!is_state $op and !null($lseq) and $lseq->name eq "lineseq") {
954 if ($lseq->first && !null($lseq->first) && is_state($lseq->first)
955 && (my $sib = $lseq->first->sibling)) {
956 return (!null($sib) && $sib->name eq "leaveloop");
957 }
958 }
959 return 0;
960}
961
6e90668e
SM
962sub is_scalar {
963 my $op = shift;
3f872cb9
GS
964 return ($op->name eq "rv2sv" or
965 $op->name eq "padsv" or
966 $op->name eq "gv" or # only in array/hash constructs
bd0865ec 967 $op->flags & OPf_KIDS && !null($op->first)
3f872cb9 968 && $op->first->name eq "gvsv");
6e90668e
SM
969}
970
9d2c6865
SM
971sub maybe_parens {
972 my $self = shift;
973 my($text, $cx, $prec) = @_;
974 if ($prec < $cx # unary ops nest just fine
975 or $prec == $cx and $cx != 4 and $cx != 16 and $cx != 21
976 or $self->{'parens'})
977 {
978 $text = "($text)";
979 # In a unop, let parent reuse our parens; see maybe_parens_unop
980 $text = "\cS" . $text if $cx == 16;
981 return $text;
982 } else {
983 return $text;
984 }
985}
986
987# same as above, but get around the `if it looks like a function' rule
988sub maybe_parens_unop {
989 my $self = shift;
990 my($name, $kid, $cx) = @_;
991 if ($cx > 16 or $self->{'parens'}) {
a0035eb8
RH
992 $kid = $self->deparse($kid, 1);
993 if ($name eq "umask" && $kid =~ /^\d+$/) {
994 $kid = sprintf("%#o", $kid);
995 }
996 return "$name($kid)";
9d2c6865
SM
997 } else {
998 $kid = $self->deparse($kid, 16);
a0035eb8
RH
999 if ($name eq "umask" && $kid =~ /^\d+$/) {
1000 $kid = sprintf("%#o", $kid);
1001 }
9d2c6865
SM
1002 if (substr($kid, 0, 1) eq "\cS") {
1003 # use kid's parens
1004 return $name . substr($kid, 1);
1005 } elsif (substr($kid, 0, 1) eq "(") {
1006 # avoid looks-like-a-function trap with extra parens
1007 # (`+' can lead to ambiguities)
1008 return "$name(" . $kid . ")";
1009 } else {
1010 return "$name $kid";
1011 }
1012 }
1013}
1014
1015sub maybe_parens_func {
1016 my $self = shift;
1017 my($func, $text, $cx, $prec) = @_;
1018 if ($prec <= $cx or substr($text, 0, 1) eq "(" or $self->{'parens'}) {
1019 return "$func($text)";
1020 } else {
1021 return "$func $text";
1022 }
1023}
1024
6e90668e
SM
1025sub maybe_local {
1026 my $self = shift;
9d2c6865 1027 my($op, $cx, $text) = @_;
ce4e655d
RH
1028 my $our_intro = ($op->name =~ /^(gv|rv2)[ash]v$/) ? OPpOUR_INTRO : 0;
1029 if ($op->private & (OPpLVAL_INTRO|$our_intro)
1030 and not $self->{'avoid_local'}{$$op}) {
1031 my $our_local = ($op->private & OPpLVAL_INTRO) ? "local" : "our";
8e3542b6 1032 if( $our_local eq 'our' ) {
cf24a840
SM
1033 # XXX This assertion fails code with non-ASCII identifiers,
1034 # like ./ext/Encode/t/jperl.t
8e3542b6 1035 die "Unexpected our($text)\n" unless $text =~ /^\W(\w+::)*\w+\z/;
d989cdac 1036 $text =~ s/(\w+::)+//;
8e3542b6 1037 }
e8d3f51b 1038 if (want_scalar($op)) {
ce4e655d 1039 return "$our_local $text";
e8d3f51b 1040 } else {
ce4e655d 1041 return $self->maybe_parens_func("$our_local", $text, $cx, 16);
e8d3f51b 1042 }
6e90668e
SM
1043 } else {
1044 return $text;
a798dbf2 1045 }
a798dbf2
MB
1046}
1047
3ed82cfc
GS
1048sub maybe_targmy {
1049 my $self = shift;
1050 my($op, $cx, $func, @args) = @_;
1051 if ($op->private & OPpTARGET_MY) {
1052 my $var = $self->padname($op->targ);
1053 my $val = $func->($self, $op, 7, @args);
1054 return $self->maybe_parens("$var = $val", $cx, 7);
1055 } else {
1056 return $func->($self, $op, $cx, @args);
1057 }
1058}
1059
6e90668e
SM
1060sub padname_sv {
1061 my $self = shift;
1062 my $targ = shift;
d989cdac 1063 return $self->{'curcv'}->PADLIST->ARRAYelt(0)->ARRAYelt($targ);
6e90668e
SM
1064}
1065
1066sub maybe_my {
1067 my $self = shift;
9d2c6865 1068 my($op, $cx, $text) = @_;
4c1f658f 1069 if ($op->private & OPpLVAL_INTRO and not $self->{'avoid_local'}{$$op}) {
3462b4ac 1070 my $my = $op->private & OPpPAD_STATE ? "state" : "my";
e8d3f51b 1071 if (want_scalar($op)) {
3462b4ac 1072 return "$my $text";
e8d3f51b 1073 } else {
3462b4ac 1074 return $self->maybe_parens_func($my, $text, $cx, 16);
e8d3f51b 1075 }
6e90668e
SM
1076 } else {
1077 return $text;
1078 }
1079}
1080
9d2c6865
SM
1081# The following OPs don't have functions:
1082
1083# pp_padany -- does not exist after parsing
9d2c6865 1084
2ae48fff
RGS
1085sub AUTOLOAD {
1086 if ($AUTOLOAD =~ s/^.*::pp_//) {
1087 warn "unexpected OP_".uc $AUTOLOAD;
1088 return "XXX";
1089 } else {
1090 die "Undefined subroutine $AUTOLOAD called";
1091 }
9d2c6865 1092}
6e90668e 1093
611c1e95
IZ
1094sub DESTROY {} # Do not AUTOLOAD
1095
ce4e655d
RH
1096# $root should be the op which represents the root of whatever
1097# we're sequencing here. If it's undefined, then we don't append
1098# any subroutine declarations to the deparsed ops, otherwise we
1099# append appropriate declarations.
58cccf98 1100sub lineseq {
ce4e655d 1101 my($self, $root, @ops) = @_;
58cccf98 1102 my($expr, @exprs);
ce4e655d
RH
1103
1104 my $out_cop = $self->{'curcop'};
1105 my $out_seq = defined($out_cop) ? $out_cop->cop_seq : undef;
1106 my $limit_seq;
1107 if (defined $root) {
1108 $limit_seq = $out_seq;
76df5e8f
DM
1109 my $nseq;
1110 $nseq = $self->find_scope_st($root->sibling) if ${$root->sibling};
ce4e655d
RH
1111 $limit_seq = $nseq if !defined($limit_seq)
1112 or defined($nseq) && $nseq < $limit_seq;
1113 }
1114 $limit_seq = $self->{'limit_seq'}
1115 if defined($self->{'limit_seq'})
1116 && (!defined($limit_seq) || $self->{'limit_seq'} < $limit_seq);
1117 local $self->{'limit_seq'} = $limit_seq;
09d856fb
CK
1118
1119 $self->walk_lineseq($root, \@ops,
1120 sub { push @exprs, $_[0]} );
1121
ce4e655d
RH
1122 my $body = join(";\n", grep {length} @exprs);
1123 my $subs = "";
67fc2416 1124 if (defined $root && defined $limit_seq && !$self->{'in_format'}) {
ce4e655d
RH
1125 $subs = join "\n", $self->seq_subs($limit_seq);
1126 }
1127 return join(";\n", grep {length} $body, $subs);
6e90668e
SM
1128}
1129
58cccf98 1130sub scopeop {
d989cdac 1131 my($real_block, $self, $op, $cx) = @_;
58cccf98
SM
1132 my $kid;
1133 my @kids;
a0405c92 1134
0ced6c29
RGS
1135 local(@$self{qw'curstash warnings hints hinthash'})
1136 = @$self{qw'curstash warnings hints hinthash'} if $real_block;
58cccf98
SM
1137 if ($real_block) {
1138 $kid = $op->first->sibling; # skip enter
1139 if (is_miniwhile($kid)) {
1140 my $top = $kid->first;
1141 my $name = $top->name;
1142 if ($name eq "and") {
1143 $name = "while";
1144 } elsif ($name eq "or") {
1145 $name = "until";
1146 } else { # no conditional -> while 1 or until 0
1147 return $self->deparse($top->first, 1) . " while 1";
1148 }
1149 my $cond = $top->first;
1150 my $body = $cond->sibling->first; # skip lineseq
1151 $cond = $self->deparse($cond, 1);
1152 $body = $self->deparse($body, 1);
1153 return "$body $name $cond";
6e90668e 1154 }
58cccf98
SM
1155 } else {
1156 $kid = $op->first;
1157 }
1158 for (; !null($kid); $kid = $kid->sibling) {
1159 push @kids, $kid;
6e90668e 1160 }
d989cdac 1161 if ($cx > 0) { # inside an expression, (a do {} while for lineseq)
ce4e655d 1162 return "do {\n\t" . $self->lineseq($op, @kids) . "\n\b}";
9d2c6865 1163 } else {
ce4e655d 1164 my $lineseq = $self->lineseq($op, @kids);
7a9b44b9 1165 return (length ($lineseq) ? "$lineseq;" : "");
6e90668e 1166 }
6e90668e
SM
1167}
1168
ce4e655d 1169sub pp_scope { scopeop(0, @_); }
58cccf98
SM
1170sub pp_lineseq { scopeop(0, @_); }
1171sub pp_leave { scopeop(1, @_); }
9d2c6865 1172
d989cdac
SM
1173# This is a special case of scopeop and lineseq, for the case of the
1174# main_root. The difference is that we print the output statements as
1175# soon as we get them, for the sake of impatient users.
1176sub deparse_root {
1177 my $self = shift;
1178 my($op) = @_;
0ced6c29
RGS
1179 local(@$self{qw'curstash warnings hints hinthash'})
1180 = @$self{qw'curstash warnings hints hinthash'};
d989cdac 1181 my @kids;
4ca8de37 1182 return if null $op->first; # Can happen, e.g., for Bytecode without -k
d989cdac
SM
1183 for (my $kid = $op->first->sibling; !null($kid); $kid = $kid->sibling) {
1184 push @kids, $kid;
1185 }
09d856fb
CK
1186 $self->walk_lineseq($op, \@kids,
1187 sub { print $self->indent($_[0].';');
1188 print "\n" unless $_[1] == $#kids;
1189 });
1190}
1191
1192sub walk_lineseq {
1193 my ($self, $op, $kids, $callback) = @_;
1194 my @kids = @$kids;
d989cdac
SM
1195 for (my $i = 0; $i < @kids; $i++) {
1196 my $expr = "";
1197 if (is_state $kids[$i]) {
09d856fb 1198 $expr = $self->deparse($kids[$i++], 0);
d989cdac 1199 if ($i > $#kids) {
09d856fb 1200 $callback->($expr, $i);
d989cdac
SM
1201 last;
1202 }
1203 }
1204 if (is_for_loop($kids[$i])) {
09d856fb 1205 $callback->($expr . $self->for_loop($kids[$i], 0), $i++);
d989cdac
SM
1206 next;
1207 }
1208 $expr .= $self->deparse($kids[$i], (@kids != 1)/2);
1209 $expr =~ s/;\n?\z//;
09d856fb 1210 $callback->($expr, $i);
d989cdac
SM
1211 }
1212}
1213
6e90668e
SM
1214# The BEGIN {} is used here because otherwise this code isn't executed
1215# when you run B::Deparse on itself.
1216my %globalnames;
1217BEGIN { map($globalnames{$_}++, "SIG", "STDIN", "STDOUT", "STDERR", "INC",
1218 "ENV", "ARGV", "ARGVOUT", "_"); }
1219
1220sub gv_name {
1221 my $self = shift;
1222 my $gv = shift;
c6e79e55 1223Carp::confess() unless ref($gv) eq "B::GV";
6e90668e 1224 my $stash = $gv->STASH->NAME;
d9963e60 1225 my $name = $gv->SAFENAME;
8b2d6640
FC
1226 if ($stash eq 'main' && $name =~ /^::/) {
1227 $stash = '::';
1228 }
1229 elsif (($stash eq 'main' && $globalnames{$name})
1230 or ($stash eq $self->{'curstash'} && !$globalnames{$name}
1231 && ($stash eq 'main' || $name !~ /::/))
644838b9 1232 or $name =~ /^[^A-Za-z_:]/)
9d2c6865 1233 {
6e90668e
SM
1234 $stash = "";
1235 } else {
1236 $stash = $stash . "::";
a798dbf2 1237 }
083bda02
MS
1238 if ($name =~ /^(\^..|{)/) {
1239 $name = "{$name}"; # ${^WARNING_BITS}, etc and ${
6e90668e
SM
1240 }
1241 return $stash . $name;
a798dbf2
MB
1242}
1243
8510e997
RH
1244# Return the name to use for a stash variable.
1245# If a lexical with the same name is in scope, it may need to be
1246# fully-qualified.
1247sub stash_variable {
1248 my ($self, $prefix, $name) = @_;
1249
1250 return "$prefix$name" if $name =~ /::/;
1251
d989cdac 1252 unless ($prefix eq '$' || $prefix eq '@' || #'
8510e997
RH
1253 $prefix eq '%' || $prefix eq '$#') {
1254 return "$prefix$name";
1255 }
1256
1257 my $v = ($prefix eq '$#' ? '@' : $prefix) . $name;
1258 return $prefix .$self->{'curstash'}.'::'. $name if $self->lex_in_scope($v);
1259 return "$prefix$name";
1260}
1261
1262sub lex_in_scope {
1263 my ($self, $name) = @_;
1264 $self->populate_curcvlex() if !defined $self->{'curcvlex'};
1265
6ec152c3 1266 return 0 if !defined($self->{'curcop'});
8510e997
RH
1267 my $seq = $self->{'curcop'}->cop_seq;
1268 return 0 if !exists $self->{'curcvlex'}{$name};
1269 for my $a (@{$self->{'curcvlex'}{$name}}) {
1270 my ($st, $en) = @$a;
1271 return 1 if $seq > $st && $seq <= $en;
1272 }
1273 return 0;
1274}
1275
1276sub populate_curcvlex {
1277 my $self = shift;
ce4e655d 1278 for (my $cv = $self->{'curcv'}; class($cv) eq "CV"; $cv = $cv->OUTSIDE) {
7dafbf52
DM
1279 my $padlist = $cv->PADLIST;
1280 # an undef CV still in lexical chain
1281 next if class($padlist) eq "SPECIAL";
1282 my @padlist = $padlist->ARRAY;
8510e997
RH
1283 my @ns = $padlist[0]->ARRAY;
1284
1285 for (my $i=0; $i<@ns; ++$i) {
1286 next if class($ns[$i]) eq "SPECIAL";
ce4e655d 1287 next if $ns[$i]->FLAGS & SVpad_OUR; # Skip "our" vars
0f2fe21d
RH
1288 if (class($ns[$i]) eq "PV") {
1289 # Probably that pesky lexical @_
1290 next;
1291 }
8510e997 1292 my $name = $ns[$i]->PVX;
7dafbf52
DM
1293 my ($seq_st, $seq_en) =
1294 ($ns[$i]->FLAGS & SVf_FAKE)
1295 ? (0, 999999)
809abb02 1296 : ($ns[$i]->COP_SEQ_RANGE_LOW, $ns[$i]->COP_SEQ_RANGE_HIGH);
8510e997
RH
1297
1298 push @{$self->{'curcvlex'}{$name}}, [$seq_st, $seq_en];
1299 }
1300 }
1301}
1302
ce4e655d
RH
1303sub find_scope_st { ((find_scope(@_))[0]); }
1304sub find_scope_en { ((find_scope(@_))[1]); }
1305
1306# Recurses down the tree, looking for pad variable introductions and COPs
1307sub find_scope {
1308 my ($self, $op, $scope_st, $scope_en) = @_;
ff97752d 1309 carp("Undefined op in find_scope") if !defined $op;
ce4e655d
RH
1310 return ($scope_st, $scope_en) unless $op->flags & OPf_KIDS;
1311
b6b46d6f
AB
1312 my @queue = ($op);
1313 while(my $op = shift @queue ) {
1314 for (my $o=$op->first; $$o; $o=$o->sibling) {
1315 if ($o->name =~ /^pad.v$/ && $o->private & OPpLVAL_INTRO) {
1316 my $s = int($self->padname_sv($o->targ)->COP_SEQ_RANGE_LOW);
1317 my $e = $self->padname_sv($o->targ)->COP_SEQ_RANGE_HIGH;
1318 $scope_st = $s if !defined($scope_st) || $s < $scope_st;
1319 $scope_en = $e if !defined($scope_en) || $e > $scope_en;
1320 return ($scope_st, $scope_en);
1321 }
1322 elsif (is_state($o)) {
1323 my $c = $o->cop_seq;
1324 $scope_st = $c if !defined($scope_st) || $c < $scope_st;
1325 $scope_en = $c if !defined($scope_en) || $c > $scope_en;
1326 return ($scope_st, $scope_en);
1327 }
1328 elsif ($o->flags & OPf_KIDS) {
1329 unshift (@queue, $o);
1330 }
34a48b4b
RH
1331 }
1332 }
ce4e655d
RH
1333
1334 return ($scope_st, $scope_en);
34a48b4b
RH
1335}
1336
1337# Returns a list of subs which should be inserted before the COP
1338sub cop_subs {
1339 my ($self, $op, $out_seq) = @_;
1340 my $seq = $op->cop_seq;
1341 # If we have nephews, then our sequence number indicates
1342 # the cop_seq of the end of some sort of scope.
1343 if (class($op->sibling) ne "NULL" && $op->sibling->flags & OPf_KIDS
ce4e655d
RH
1344 and my $nseq = $self->find_scope_st($op->sibling) ) {
1345 $seq = $nseq;
34a48b4b
RH
1346 }
1347 $seq = $out_seq if defined($out_seq) && $out_seq < $seq;
1348 return $self->seq_subs($seq);
1349}
1350
1351sub seq_subs {
1352 my ($self, $seq) = @_;
1353 my @text;
1354#push @text, "# ($seq)\n";
1355
ce4e655d 1356 return "" if !defined $seq;
34a48b4b
RH
1357 while (scalar(@{$self->{'subs_todo'}})
1358 and $seq > $self->{'subs_todo'}[0][0]) {
1359 push @text, $self->next_todo;
1360 }
1361 return @text;
1362}
1363
08c6f5ec 1364# Notice how subs and formats are inserted between statements here;
a0405c92 1365# also $[ assignments and pragmas.
6e90668e
SM
1366sub pp_nextstate {
1367 my $self = shift;
9d2c6865 1368 my($op, $cx) = @_;
34a48b4b 1369 $self->{'curcop'} = $op;
6e90668e 1370 my @text;
34a48b4b 1371 push @text, $self->cop_subs($op);
e99ebc55 1372 push @text, $op->label . ": " if $op->label;
11faa288 1373 my $stash = $op->stashpv;
6e90668e
SM
1374 if ($stash ne $self->{'curstash'}) {
1375 push @text, "package $stash;\n";
1376 $self->{'curstash'} = $stash;
1377 }
08c6f5ec 1378
7a9b44b9
RH
1379 if ($self->{'arybase'} != $op->arybase) {
1380 push @text, '$[ = '. $op->arybase .";\n";
1381 $self->{'arybase'} = $op->arybase;
1382 }
1383
1384 my $warnings = $op->warnings;
1385 my $warning_bits;
1386 if ($warnings->isa("B::SPECIAL") && $$warnings == 4) {
810aef70 1387 $warning_bits = $warnings::Bits{"all"} & WARN_MASK;
7a9b44b9 1388 }
e31885a0 1389 elsif ($warnings->isa("B::SPECIAL") && $$warnings == 5) {
810aef70 1390 $warning_bits = $warnings::NONE;
7a9b44b9 1391 }
e31885a0
RH
1392 elsif ($warnings->isa("B::SPECIAL")) {
1393 $warning_bits = undef;
1394 }
7a9b44b9 1395 else {
34a48b4b 1396 $warning_bits = $warnings->PV & WARN_MASK;
7a9b44b9
RH
1397 }
1398
e31885a0
RH
1399 if (defined ($warning_bits) and
1400 !defined($self->{warnings}) || $self->{'warnings'} ne $warning_bits) {
08c6f5ec 1401 push @text, declare_warnings($self->{'warnings'}, $warning_bits);
7a9b44b9
RH
1402 $self->{'warnings'} = $warning_bits;
1403 }
1404
d5ec2987
NC
1405 if ($self->{'hints'} != $op->hints) {
1406 push @text, declare_hints($self->{'hints'}, $op->hints);
1407 $self->{'hints'} = $op->hints;
a0405c92
RH
1408 }
1409
0ced6c29 1410 # hack to check that the hint hash hasn't changed
e9c69003
NC
1411 if ($] > 5.009 &&
1412 "@{[sort %{$self->{'hinthash'} || {}}]}"
1413 ne "@{[sort %{$op->hints_hash->HASH || {}}]}") {
0ced6c29
RGS
1414 push @text, declare_hinthash($self->{'hinthash'}, $op->hints_hash->HASH, $self->{indent_size});
1415 $self->{'hinthash'} = $op->hints_hash->HASH;
1416 }
1417
d989cdac
SM
1418 # This should go after of any branches that add statements, to
1419 # increase the chances that it refers to the same line it did in
1420 # the original program.
1421 if ($self->{'linenums'}) {
1422 push @text, "\f#line " . $op->line .
1423 ' "' . $op->file, qq'"\n';
1424 }
1425
6e90668e
SM
1426 return join("", @text);
1427}
1428
08c6f5ec
RH
1429sub declare_warnings {
1430 my ($from, $to) = @_;
e6f1f756 1431 if (($to & WARN_MASK) eq (warnings::bits("all") & WARN_MASK)) {
a0405c92
RH
1432 return "use warnings;\n";
1433 }
e6f1f756 1434 elsif (($to & WARN_MASK) eq ("\0"x length($to) & WARN_MASK)) {
a0405c92
RH
1435 return "no warnings;\n";
1436 }
51a5edaf 1437 return "BEGIN {\${^WARNING_BITS} = ".perlstring($to)."}\n";
a0405c92
RH
1438}
1439
1440sub declare_hints {
1441 my ($from, $to) = @_;
a0035eb8
RH
1442 my $use = $to & ~$from;
1443 my $no = $from & ~$to;
1444 my $decls = "";
1445 for my $pragma (hint_pragmas($use)) {
1446 $decls .= "use $pragma;\n";
1447 }
1448 for my $pragma (hint_pragmas($no)) {
1449 $decls .= "no $pragma;\n";
1450 }
1451 return $decls;
1452}
1453
493c23c6
NC
1454# Internal implementation hints that the core sets automatically, so don't need
1455# (or want) to be passed back to the user
1456my %ignored_hints = (
1457 'open<' => 1,
1458 'open>' => 1,
dca6062a 1459 ':' => 1,
2e8342de 1460);
493c23c6 1461
0ced6c29
RGS
1462sub declare_hinthash {
1463 my ($from, $to, $indent) = @_;
1464 my @decls;
1465 for my $key (keys %$to) {
493c23c6 1466 next if $ignored_hints{$key};
0ced6c29
RGS
1467 if (!defined $from->{$key} or $from->{$key} ne $to->{$key}) {
1468 push @decls, qq(\$^H{'$key'} = q($to->{$key}););
1469 }
1470 }
1471 for my $key (keys %$from) {
493c23c6 1472 next if $ignored_hints{$key};
0ced6c29
RGS
1473 if (!exists $to->{$key}) {
1474 push @decls, qq(delete \$^H{'$key'};);
1475 }
1476 }
1477 @decls or return '';
1478 return join("\n" . (" " x $indent), "BEGIN {", @decls) . "\n}\n";
1479}
1480
a0035eb8
RH
1481sub hint_pragmas {
1482 my ($bits) = @_;
1483 my @pragmas;
1484 push @pragmas, "integer" if $bits & 0x1;
1485 push @pragmas, "strict 'refs'" if $bits & 0x2;
1486 push @pragmas, "bytes" if $bits & 0x8;
1487 return @pragmas;
08c6f5ec
RH
1488}
1489
6e90668e 1490sub pp_dbstate { pp_nextstate(@_) }
3f872cb9 1491sub pp_setstate { pp_nextstate(@_) }
6e90668e
SM
1492
1493sub pp_unstack { return "" } # see also leaveloop
1494
1495sub baseop {
1496 my $self = shift;
9d2c6865 1497 my($op, $cx, $name) = @_;
6e90668e
SM
1498 return $name;
1499}
1500
e99ebc55
RH
1501sub pp_stub {
1502 my $self = shift;
1503 my($op, $cx, $name) = @_;
d989cdac 1504 if ($cx >= 1) {
e99ebc55
RH
1505 return "()";
1506 }
1507 else {
1508 return "();";
1509 }
1510}
6e90668e
SM
1511sub pp_wantarray { baseop(@_, "wantarray") }
1512sub pp_fork { baseop(@_, "fork") }
3ed82cfc
GS
1513sub pp_wait { maybe_targmy(@_, \&baseop, "wait") }
1514sub pp_getppid { maybe_targmy(@_, \&baseop, "getppid") }
1515sub pp_time { maybe_targmy(@_, \&baseop, "time") }
6e90668e
SM
1516sub pp_tms { baseop(@_, "times") }
1517sub pp_ghostent { baseop(@_, "gethostent") }
1518sub pp_gnetent { baseop(@_, "getnetent") }
1519sub pp_gprotoent { baseop(@_, "getprotoent") }
1520sub pp_gservent { baseop(@_, "getservent") }
1521sub pp_ehostent { baseop(@_, "endhostent") }
1522sub pp_enetent { baseop(@_, "endnetent") }
1523sub pp_eprotoent { baseop(@_, "endprotoent") }
1524sub pp_eservent { baseop(@_, "endservent") }
1525sub pp_gpwent { baseop(@_, "getpwent") }
1526sub pp_spwent { baseop(@_, "setpwent") }
1527sub pp_epwent { baseop(@_, "endpwent") }
1528sub pp_ggrent { baseop(@_, "getgrent") }
1529sub pp_sgrent { baseop(@_, "setgrent") }
1530sub pp_egrent { baseop(@_, "endgrent") }
1531sub pp_getlogin { baseop(@_, "getlogin") }
1532
1533sub POSTFIX () { 1 }
1534
9d2c6865
SM
1535# I couldn't think of a good short name, but this is the category of
1536# symbolic unary operators with interesting precedence
1537
1538sub pfixop {
1539 my $self = shift;
1540 my($op, $cx, $name, $prec, $flags) = (@_, 0);
1541 my $kid = $op->first;
1542 $kid = $self->deparse($kid, $prec);
1543 return $self->maybe_parens(($flags & POSTFIX) ? "$kid$name" : "$name$kid",
1544 $cx, $prec);
1545}
1546
1547sub pp_preinc { pfixop(@_, "++", 23) }
1548sub pp_predec { pfixop(@_, "--", 23) }
3ed82cfc
GS
1549sub pp_postinc { maybe_targmy(@_, \&pfixop, "++", 23, POSTFIX) }
1550sub pp_postdec { maybe_targmy(@_, \&pfixop, "--", 23, POSTFIX) }
9d2c6865
SM
1551sub pp_i_preinc { pfixop(@_, "++", 23) }
1552sub pp_i_predec { pfixop(@_, "--", 23) }
3ed82cfc
GS
1553sub pp_i_postinc { maybe_targmy(@_, \&pfixop, "++", 23, POSTFIX) }
1554sub pp_i_postdec { maybe_targmy(@_, \&pfixop, "--", 23, POSTFIX) }
68cc8748 1555sub pp_complement { maybe_targmy(@_, \&pfixop, "~", 21) }
9d2c6865 1556
3ed82cfc
GS
1557sub pp_negate { maybe_targmy(@_, \&real_negate) }
1558sub real_negate {
9d2c6865
SM
1559 my $self = shift;
1560 my($op, $cx) = @_;
3f872cb9 1561 if ($op->first->name =~ /^(i_)?negate$/) {
9d2c6865
SM
1562 # avoid --$x
1563 $self->pfixop($op, $cx, "-", 21.5);
1564 } else {
1565 $self->pfixop($op, $cx, "-", 21);
1566 }
1567}
1568sub pp_i_negate { pp_negate(@_) }
1569
1570sub pp_not {
1571 my $self = shift;
1572 my($op, $cx) = @_;
1573 if ($cx <= 4) {
1574 $self->pfixop($op, $cx, "not ", 4);
1575 } else {
1576 $self->pfixop($op, $cx, "!", 21);
1577 }
1578}
1579
6e90668e
SM
1580sub unop {
1581 my $self = shift;
f4a44678 1582 my($op, $cx, $name) = @_;
6e90668e 1583 my $kid;
9d2c6865 1584 if ($op->flags & OPf_KIDS) {
6e90668e 1585 $kid = $op->first;
d989cdac 1586 if (defined prototype("CORE::$name")
e31885a0
RH
1587 && prototype("CORE::$name") =~ /^;?\*/
1588 && $kid->name eq "rv2gv") {
1589 $kid = $kid->first;
1590 }
1591
9d2c6865 1592 return $self->maybe_parens_unop($name, $kid, $cx);
6e90668e 1593 } else {
d989cdac 1594 return $name . ($op->flags & OPf_SPECIAL ? "()" : "");
6e90668e 1595 }
6e90668e
SM
1596}
1597
3ed82cfc
GS
1598sub pp_chop { maybe_targmy(@_, \&unop, "chop") }
1599sub pp_chomp { maybe_targmy(@_, \&unop, "chomp") }
1600sub pp_schop { maybe_targmy(@_, \&unop, "chop") }
1601sub pp_schomp { maybe_targmy(@_, \&unop, "chomp") }
6e90668e
SM
1602sub pp_defined { unop(@_, "defined") }
1603sub pp_undef { unop(@_, "undef") }
1604sub pp_study { unop(@_, "study") }
6e90668e
SM
1605sub pp_ref { unop(@_, "ref") }
1606sub pp_pos { maybe_local(@_, unop(@_, "pos")) }
1607
3ed82cfc
GS
1608sub pp_sin { maybe_targmy(@_, \&unop, "sin") }
1609sub pp_cos { maybe_targmy(@_, \&unop, "cos") }
1610sub pp_rand { maybe_targmy(@_, \&unop, "rand") }
6e90668e 1611sub pp_srand { unop(@_, "srand") }
3ed82cfc
GS
1612sub pp_exp { maybe_targmy(@_, \&unop, "exp") }
1613sub pp_log { maybe_targmy(@_, \&unop, "log") }
1614sub pp_sqrt { maybe_targmy(@_, \&unop, "sqrt") }
1615sub pp_int { maybe_targmy(@_, \&unop, "int") }
1616sub pp_hex { maybe_targmy(@_, \&unop, "hex") }
1617sub pp_oct { maybe_targmy(@_, \&unop, "oct") }
1618sub pp_abs { maybe_targmy(@_, \&unop, "abs") }
1619
1620sub pp_length { maybe_targmy(@_, \&unop, "length") }
1621sub pp_ord { maybe_targmy(@_, \&unop, "ord") }
1622sub pp_chr { maybe_targmy(@_, \&unop, "chr") }
6e90668e
SM
1623
1624sub pp_each { unop(@_, "each") }
1625sub pp_values { unop(@_, "values") }
1626sub pp_keys { unop(@_, "keys") }
644741fd
NC
1627sub pp_aeach { unop(@_, "each") }
1628sub pp_avalues { unop(@_, "values") }
1629sub pp_akeys { unop(@_, "keys") }
6e90668e
SM
1630sub pp_pop { unop(@_, "pop") }
1631sub pp_shift { unop(@_, "shift") }
1632
1633sub pp_caller { unop(@_, "caller") }
1634sub pp_reset { unop(@_, "reset") }
1635sub pp_exit { unop(@_, "exit") }
1636sub pp_prototype { unop(@_, "prototype") }
1637
1638sub pp_close { unop(@_, "close") }
1639sub pp_fileno { unop(@_, "fileno") }
1640sub pp_umask { unop(@_, "umask") }
6e90668e
SM
1641sub pp_untie { unop(@_, "untie") }
1642sub pp_tied { unop(@_, "tied") }
1643sub pp_dbmclose { unop(@_, "dbmclose") }
1644sub pp_getc { unop(@_, "getc") }
1645sub pp_eof { unop(@_, "eof") }
1646sub pp_tell { unop(@_, "tell") }
1647sub pp_getsockname { unop(@_, "getsockname") }
1648sub pp_getpeername { unop(@_, "getpeername") }
1649
3ed82cfc
GS
1650sub pp_chdir { maybe_targmy(@_, \&unop, "chdir") }
1651sub pp_chroot { maybe_targmy(@_, \&unop, "chroot") }
6e90668e 1652sub pp_readlink { unop(@_, "readlink") }
3ed82cfc 1653sub pp_rmdir { maybe_targmy(@_, \&unop, "rmdir") }
6e90668e
SM
1654sub pp_readdir { unop(@_, "readdir") }
1655sub pp_telldir { unop(@_, "telldir") }
1656sub pp_rewinddir { unop(@_, "rewinddir") }
1657sub pp_closedir { unop(@_, "closedir") }
3ed82cfc 1658sub pp_getpgrp { maybe_targmy(@_, \&unop, "getpgrp") }
6e90668e
SM
1659sub pp_localtime { unop(@_, "localtime") }
1660sub pp_gmtime { unop(@_, "gmtime") }
1661sub pp_alarm { unop(@_, "alarm") }
3ed82cfc 1662sub pp_sleep { maybe_targmy(@_, \&unop, "sleep") }
6e90668e
SM
1663
1664sub pp_dofile { unop(@_, "do") }
1665sub pp_entereval { unop(@_, "eval") }
1666
1667sub pp_ghbyname { unop(@_, "gethostbyname") }
1668sub pp_gnbyname { unop(@_, "getnetbyname") }
1669sub pp_gpbyname { unop(@_, "getprotobyname") }
1670sub pp_shostent { unop(@_, "sethostent") }
1671sub pp_snetent { unop(@_, "setnetent") }
1672sub pp_sprotoent { unop(@_, "setprotoent") }
1673sub pp_sservent { unop(@_, "setservent") }
1674sub pp_gpwnam { unop(@_, "getpwnam") }
1675sub pp_gpwuid { unop(@_, "getpwuid") }
1676sub pp_ggrnam { unop(@_, "getgrnam") }
1677sub pp_ggrgid { unop(@_, "getgrgid") }
1678
1679sub pp_lock { unop(@_, "lock") }
1680
0d863452
RH
1681sub pp_continue { unop(@_, "continue"); }
1682sub pp_break {
1683 my ($self, $op) = @_;
1684 return "" if $op->flags & OPf_SPECIAL;
1685 unop(@_, "break");
1686}
1687
1688sub givwhen {
1689 my $self = shift;
1690 my($op, $cx, $givwhen) = @_;
1691
1692 my $enterop = $op->first;
1693 my ($head, $block);
1694 if ($enterop->flags & OPf_SPECIAL) {
1695 $head = "default";
1696 $block = $self->deparse($enterop->first, 0);
1697 }
1698 else {
1699 my $cond = $enterop->first;
1700 my $cond_str = $self->deparse($cond, 1);
1701 $head = "$givwhen ($cond_str)";
1702 $block = $self->deparse($cond->sibling, 0);
1703 }
1704
1705 return "$head {\n".
1706 "\t$block\n".
1707 "\b}\cK";
1708}
1709
1710sub pp_leavegiven { givwhen(@_, "given"); }
1711sub pp_leavewhen { givwhen(@_, "when"); }
1712
6e90668e
SM
1713sub pp_exists {
1714 my $self = shift;
9d2c6865 1715 my($op, $cx) = @_;
34a48b4b
RH
1716 my $arg;
1717 if ($op->private & OPpEXISTS_SUB) {
1718 # Checking for the existence of a subroutine
1719 return $self->maybe_parens_func("exists",
1720 $self->pp_rv2cv($op->first, 16), $cx, 16);
1721 }
1722 if ($op->flags & OPf_SPECIAL) {
1723 # Array element, not hash element
1724 return $self->maybe_parens_func("exists",
1725 $self->pp_aelem($op->first, 16), $cx, 16);
1726 }
9d2c6865
SM
1727 return $self->maybe_parens_func("exists", $self->pp_helem($op->first, 16),
1728 $cx, 16);
6e90668e
SM
1729}
1730
6e90668e
SM
1731sub pp_delete {
1732 my $self = shift;
9d2c6865 1733 my($op, $cx) = @_;
6e90668e
SM
1734 my $arg;
1735 if ($op->private & OPpSLICE) {
34a48b4b
RH
1736 if ($op->flags & OPf_SPECIAL) {
1737 # Deleting from an array, not a hash
1738 return $self->maybe_parens_func("delete",
1739 $self->pp_aslice($op->first, 16),
1740 $cx, 16);
1741 }
9d2c6865
SM
1742 return $self->maybe_parens_func("delete",
1743 $self->pp_hslice($op->first, 16),
1744 $cx, 16);
6e90668e 1745 } else {
34a48b4b
RH
1746 if ($op->flags & OPf_SPECIAL) {
1747 # Deleting from an array, not a hash
1748 return $self->maybe_parens_func("delete",
1749 $self->pp_aelem($op->first, 16),
1750 $cx, 16);
1751 }
9d2c6865
SM
1752 return $self->maybe_parens_func("delete",
1753 $self->pp_helem($op->first, 16),
1754 $cx, 16);
6e90668e 1755 }
6e90668e
SM
1756}
1757
6e90668e
SM
1758sub pp_require {
1759 my $self = shift;
9d2c6865 1760 my($op, $cx) = @_;
d5889722 1761 my $opname = $op->flags & OPf_SPECIAL ? 'CORE::require' : 'require';
3f872cb9 1762 if (class($op) eq "UNOP" and $op->first->name eq "const"
4c1f658f 1763 and $op->first->private & OPpCONST_BARE)
6e90668e 1764 {
18228111 1765 my $name = $self->const_sv($op->first)->PV;
6e90668e
SM
1766 $name =~ s[/][::]g;
1767 $name =~ s/\.pm//g;
d5889722 1768 return "$opname $name";
6e90668e 1769 } else {
d5889722 1770 $self->unop($op, $cx, $opname);
6e90668e
SM
1771 }
1772}
1773
d989cdac 1774sub pp_scalar {
9d2c6865 1775 my $self = shift;
d9002312 1776 my($op, $cx) = @_;
9d2c6865
SM
1777 my $kid = $op->first;
1778 if (not null $kid->sibling) {
1779 # XXX Was a here-doc
1780 return $self->dquote($op);
1781 }
1782 $self->unop(@_, "scalar");
1783}
1784
1785
6e90668e
SM
1786sub padval {
1787 my $self = shift;
1788 my $targ = shift;
d989cdac 1789 return $self->{'curcv'}->PADLIST->ARRAYelt(1)->ARRAYelt($targ);
6e90668e
SM
1790}
1791
78c72037
NC
1792sub anon_hash_or_list {
1793 my $self = shift;
d9002312 1794 my($op, $cx) = @_;
78c72037
NC
1795
1796 my($pre, $post) = @{{"anonlist" => ["[","]"],
1797 "anonhash" => ["{","}"]}->{$op->name}};
1798 my($expr, @exprs);
1799 $op = $op->first->sibling; # skip pushmark
1800 for (; !null($op); $op = $op->sibling) {
1801 $expr = $self->deparse($op, 6);
1802 push @exprs, $expr;
1803 }
d9002312
SM
1804 if ($pre eq "{" and $cx < 1) {
1805 # Disambiguate that it's not a block
1806 $pre = "+{";
1807 }
78c72037
NC
1808 return $pre . join(", ", @exprs) . $post;
1809}
1810
1811sub pp_anonlist {
d9002312
SM
1812 my $self = shift;
1813 my ($op, $cx) = @_;
78c72037 1814 if ($op->flags & OPf_SPECIAL) {
d9002312 1815 return $self->anon_hash_or_list($op, $cx);
78c72037
NC
1816 }
1817 warn "Unexpected op pp_" . $op->name() . " without OPf_SPECIAL";
1818 return 'XXX';
1819}
1820
1821*pp_anonhash = \&pp_anonlist;
1822
6e90668e
SM
1823sub pp_refgen {
1824 my $self = shift;
9d2c6865 1825 my($op, $cx) = @_;
6e90668e 1826 my $kid = $op->first;
3f872cb9 1827 if ($kid->name eq "null") {
6e90668e 1828 $kid = $kid->first;
35925e80 1829 if (!null($kid->sibling) and
3f872cb9 1830 $kid->sibling->name eq "anoncode") {
09d856fb 1831 return $self->e_anoncode({ code => $self->padval($kid->sibling->targ) });
3f872cb9
GS
1832 } elsif ($kid->name eq "pushmark") {
1833 my $sib_name = $kid->sibling->name;
1834 if ($sib_name =~ /^(pad|rv2)[ah]v$/
c8c62db7
AD
1835 and not $kid->sibling->flags & OPf_REF)
1836 {
1837 # The @a in \(@a) isn't in ref context, but only when the
1838 # parens are there.
127212b2 1839 return "\\(" . $self->pp_list($op->first) . ")";
3f872cb9 1840 } elsif ($sib_name eq 'entersub') {
c8c62db7
AD
1841 my $text = $self->deparse($kid->sibling, 1);
1842 # Always show parens for \(&func()), but only with -p otherwise
1843 $text = "($text)" if $self->{'parens'}
1844 or $kid->sibling->private & OPpENTERSUB_AMPER;
1845 return "\\$text";
1846 }
1847 }
6e90668e 1848 }
9d2c6865 1849 $self->pfixop($op, $cx, "\\", 20);
6e90668e
SM
1850}
1851
09d856fb
CK
1852sub e_anoncode {
1853 my ($self, $info) = @_;
1854 my $text = $self->deparse_sub($info->{code});
1855 return "sub " . $text;
1856}
1857
6e90668e
SM
1858sub pp_srefgen { pp_refgen(@_) }
1859
1860sub pp_readline {
1861 my $self = shift;
9d2c6865 1862 my($op, $cx) = @_;
6e90668e 1863 my $kid = $op->first;
3f872cb9 1864 $kid = $kid->first if $kid->name eq "rv2gv"; # <$fh>
e31885a0
RH
1865 return "<" . $self->deparse($kid, 1) . ">" if is_scalar($kid);
1866 return $self->unop($op, $cx, "readline");
6e90668e
SM
1867}
1868
ad8caead
RGS
1869sub pp_rcatline {
1870 my $self = shift;
1871 my($op) = @_;
d989cdac 1872 return "<" . $self->gv_name($self->gv_or_padgv($op)) . ">";
ad8caead
RGS
1873}
1874
bd0865ec
GS
1875# Unary operators that can occur as pseudo-listops inside double quotes
1876sub dq_unop {
1877 my $self = shift;
1878 my($op, $cx, $name, $prec, $flags) = (@_, 0, 0);
1879 my $kid;
1880 if ($op->flags & OPf_KIDS) {
1881 $kid = $op->first;
1882 # If there's more than one kid, the first is an ex-pushmark.
1883 $kid = $kid->sibling if not null $kid->sibling;
1884 return $self->maybe_parens_unop($name, $kid, $cx);
1885 } else {
d989cdac 1886 return $name . ($op->flags & OPf_SPECIAL ? "()" : "");
bd0865ec
GS
1887 }
1888}
1889
1890sub pp_ucfirst { dq_unop(@_, "ucfirst") }
1891sub pp_lcfirst { dq_unop(@_, "lcfirst") }
1892sub pp_uc { dq_unop(@_, "uc") }
1893sub pp_lc { dq_unop(@_, "lc") }
3ed82cfc 1894sub pp_quotemeta { maybe_targmy(@_, \&dq_unop, "quotemeta") }
bd0865ec 1895
6e90668e
SM
1896sub loopex {
1897 my $self = shift;
9d2c6865 1898 my ($op, $cx, $name) = @_;
6e90668e 1899 if (class($op) eq "PVOP") {
9d2c6865
SM
1900 return "$name " . $op->pv;
1901 } elsif (class($op) eq "OP") {
1902 return $name;
6e90668e 1903 } elsif (class($op) eq "UNOP") {
9d2c6865
SM
1904 # Note -- loop exits are actually exempt from the
1905 # looks-like-a-func rule, but a few extra parens won't hurt
1906 return $self->maybe_parens_unop($name, $op->first, $cx);
6e90668e 1907 }
6e90668e
SM
1908}
1909
1910sub pp_last { loopex(@_, "last") }
1911sub pp_next { loopex(@_, "next") }
1912sub pp_redo { loopex(@_, "redo") }
1913sub pp_goto { loopex(@_, "goto") }
1914sub pp_dump { loopex(@_, "dump") }
1915
1916sub ftst {
1917 my $self = shift;
9d2c6865 1918 my($op, $cx, $name) = @_;
6e90668e 1919 if (class($op) eq "UNOP") {
9d2c6865
SM
1920 # Genuine `-X' filetests are exempt from the LLAFR, but not
1921 # l?stat(); for the sake of clarity, give'em all parens
1922 return $self->maybe_parens_unop($name, $op->first, $cx);
d989cdac 1923 } elsif (class($op) =~ /^(SV|PAD)OP$/) {
9d2c6865 1924 return $self->maybe_parens_func($name, $self->pp_gv($op, 1), $cx, 16);
6e90668e 1925 } else { # I don't think baseop filetests ever survive ck_ftst, but...
9d2c6865 1926 return $name;
6e90668e 1927 }
6e90668e
SM
1928}
1929
d989cdac
SM
1930sub pp_lstat { ftst(@_, "lstat") }
1931sub pp_stat { ftst(@_, "stat") }
1932sub pp_ftrread { ftst(@_, "-R") }
6e90668e 1933sub pp_ftrwrite { ftst(@_, "-W") }
d989cdac
SM
1934sub pp_ftrexec { ftst(@_, "-X") }
1935sub pp_fteread { ftst(@_, "-r") }
e31885a0 1936sub pp_ftewrite { ftst(@_, "-w") }
d989cdac
SM
1937sub pp_fteexec { ftst(@_, "-x") }
1938sub pp_ftis { ftst(@_, "-e") }
6e90668e
SM
1939sub pp_fteowned { ftst(@_, "-O") }
1940sub pp_ftrowned { ftst(@_, "-o") }
d989cdac
SM
1941sub pp_ftzero { ftst(@_, "-z") }
1942sub pp_ftsize { ftst(@_, "-s") }
1943sub pp_ftmtime { ftst(@_, "-M") }
1944sub pp_ftatime { ftst(@_, "-A") }
1945sub pp_ftctime { ftst(@_, "-C") }
1946sub pp_ftsock { ftst(@_, "-S") }
1947sub pp_ftchr { ftst(@_, "-c") }
1948sub pp_ftblk { ftst(@_, "-b") }
1949sub pp_ftfile { ftst(@_, "-f") }
1950sub pp_ftdir { ftst(@_, "-d") }
1951sub pp_ftpipe { ftst(@_, "-p") }
1952sub pp_ftlink { ftst(@_, "-l") }
1953sub pp_ftsuid { ftst(@_, "-u") }
1954sub pp_ftsgid { ftst(@_, "-g") }
1955sub pp_ftsvtx { ftst(@_, "-k") }
1956sub pp_fttty { ftst(@_, "-t") }
1957sub pp_fttext { ftst(@_, "-T") }
6e90668e
SM
1958sub pp_ftbinary { ftst(@_, "-B") }
1959
a798dbf2 1960sub SWAP_CHILDREN () { 1 }
6e90668e 1961sub ASSIGN () { 2 } # has OP= variant
7013e6ae 1962sub LIST_CONTEXT () { 4 } # Assignment is in list context
6e90668e 1963
9d2c6865
SM
1964my(%left, %right);
1965
1966sub assoc_class {
1967 my $op = shift;
3f872cb9
GS
1968 my $name = $op->name;
1969 if ($name eq "concat" and $op->first->name eq "concat") {
9d2c6865 1970 # avoid spurious `=' -- see comment in pp_concat
3f872cb9 1971 return "concat";
9d2c6865 1972 }
3f872cb9
GS
1973 if ($name eq "null" and class($op) eq "UNOP"
1974 and $op->first->name =~ /^(and|x?or)$/
9d2c6865
SM
1975 and null $op->first->sibling)
1976 {
1977 # Like all conditional constructs, OP_ANDs and OP_ORs are topped
1978 # with a null that's used as the common end point of the two
1979 # flows of control. For precedence purposes, ignore it.
1980 # (COND_EXPRs have these too, but we don't bother with
1981 # their associativity).
1982 return assoc_class($op->first);
1983 }
1984 return $name . ($op->flags & OPf_STACKED ? "=" : "");
1985}
1986
1987# Left associative operators, like `+', for which
1988# $a + $b + $c is equivalent to ($a + $b) + $c
1989
1990BEGIN {
3f872cb9
GS
1991 %left = ('multiply' => 19, 'i_multiply' => 19,
1992 'divide' => 19, 'i_divide' => 19,
1993 'modulo' => 19, 'i_modulo' => 19,
1994 'repeat' => 19,
1995 'add' => 18, 'i_add' => 18,
1996 'subtract' => 18, 'i_subtract' => 18,
1997 'concat' => 18,
1998 'left_shift' => 17, 'right_shift' => 17,
1999 'bit_and' => 13,
2000 'bit_or' => 12, 'bit_xor' => 12,
2001 'and' => 3,
2002 'or' => 2, 'xor' => 2,
9d2c6865
SM
2003 );
2004}
2005
2006sub deparse_binop_left {
2007 my $self = shift;
2008 my($op, $left, $prec) = @_;
58231d39 2009 if ($left{assoc_class($op)} && $left{assoc_class($left)}
9d2c6865
SM
2010 and $left{assoc_class($op)} == $left{assoc_class($left)})
2011 {
2012 return $self->deparse($left, $prec - .00001);
2013 } else {
2014 return $self->deparse($left, $prec);
2015 }
2016}
2017
2018# Right associative operators, like `=', for which
2019# $a = $b = $c is equivalent to $a = ($b = $c)
2020
2021BEGIN {
3f872cb9
GS
2022 %right = ('pow' => 22,
2023 'sassign=' => 7, 'aassign=' => 7,
2024 'multiply=' => 7, 'i_multiply=' => 7,
2025 'divide=' => 7, 'i_divide=' => 7,
2026 'modulo=' => 7, 'i_modulo=' => 7,
2027 'repeat=' => 7,
2028 'add=' => 7, 'i_add=' => 7,
2029 'subtract=' => 7, 'i_subtract=' => 7,
2030 'concat=' => 7,
2031 'left_shift=' => 7, 'right_shift=' => 7,
2032 'bit_and=' => 7,
2033 'bit_or=' => 7, 'bit_xor=' => 7,
2034 'andassign' => 7,
2035 'orassign' => 7,
9d2c6865
SM
2036 );
2037}
2038
2039sub deparse_binop_right {
2040 my $self = shift;
2041 my($op, $right, $prec) = @_;
58231d39 2042 if ($right{assoc_class($op)} && $right{assoc_class($right)}
9d2c6865
SM
2043 and $right{assoc_class($op)} == $right{assoc_class($right)})
2044 {
2045 return $self->deparse($right, $prec - .00001);
2046 } else {
2047 return $self->deparse($right, $prec);
2048 }
2049}
2050
a798dbf2 2051sub binop {
6e90668e 2052 my $self = shift;
9d2c6865 2053 my ($op, $cx, $opname, $prec, $flags) = (@_, 0);
a798dbf2
MB
2054 my $left = $op->first;
2055 my $right = $op->last;
9d2c6865
SM
2056 my $eq = "";
2057 if ($op->flags & OPf_STACKED && $flags & ASSIGN) {
2058 $eq = "=";
2059 $prec = 7;
2060 }
a798dbf2
MB
2061 if ($flags & SWAP_CHILDREN) {
2062 ($left, $right) = ($right, $left);
2063 }
9d2c6865 2064 $left = $self->deparse_binop_left($op, $left, $prec);
90c0eb26
RH
2065 $left = "($left)" if $flags & LIST_CONTEXT
2066 && $left !~ /^(my|our|local|)[\@\(]/;
9d2c6865
SM
2067 $right = $self->deparse_binop_right($op, $right, $prec);
2068 return $self->maybe_parens("$left $opname$eq $right", $cx, $prec);
2069}
2070
3ed82cfc
GS
2071sub pp_add { maybe_targmy(@_, \&binop, "+", 18, ASSIGN) }
2072sub pp_multiply { maybe_targmy(@_, \&binop, "*", 19, ASSIGN) }
2073sub pp_subtract { maybe_targmy(@_, \&binop, "-",18, ASSIGN) }
2074sub pp_divide { maybe_targmy(@_, \&binop, "/", 19, ASSIGN) }
2075sub pp_modulo { maybe_targmy(@_, \&binop, "%", 19, ASSIGN) }
2076sub pp_i_add { maybe_targmy(@_, \&binop, "+", 18, ASSIGN) }
2077sub pp_i_multiply { maybe_targmy(@_, \&binop, "*", 19, ASSIGN) }
2078sub pp_i_subtract { maybe_targmy(@_, \&binop, "-", 18, ASSIGN) }
2079sub pp_i_divide { maybe_targmy(@_, \&binop, "/", 19, ASSIGN) }
2080sub pp_i_modulo { maybe_targmy(@_, \&binop, "%", 19, ASSIGN) }
2081sub pp_pow { maybe_targmy(@_, \&binop, "**", 22, ASSIGN) }
2082
2083sub pp_left_shift { maybe_targmy(@_, \&binop, "<<", 17, ASSIGN) }
2084sub pp_right_shift { maybe_targmy(@_, \&binop, ">>", 17, ASSIGN) }
2085sub pp_bit_and { maybe_targmy(@_, \&binop, "&", 13, ASSIGN) }
2086sub pp_bit_or { maybe_targmy(@_, \&binop, "|", 12, ASSIGN) }
2087sub pp_bit_xor { maybe_targmy(@_, \&binop, "^", 12, ASSIGN) }
9d2c6865
SM
2088
2089sub pp_eq { binop(@_, "==", 14) }
2090sub pp_ne { binop(@_, "!=", 14) }
2091sub pp_lt { binop(@_, "<", 15) }
2092sub pp_gt { binop(@_, ">", 15) }
2093sub pp_ge { binop(@_, ">=", 15) }
2094sub pp_le { binop(@_, "<=", 15) }
2095sub pp_ncmp { binop(@_, "<=>", 14) }
2096sub pp_i_eq { binop(@_, "==", 14) }
2097sub pp_i_ne { binop(@_, "!=", 14) }
2098sub pp_i_lt { binop(@_, "<", 15) }
2099sub pp_i_gt { binop(@_, ">", 15) }
2100sub pp_i_ge { binop(@_, ">=", 15) }
2101sub pp_i_le { binop(@_, "<=", 15) }
2102sub pp_i_ncmp { binop(@_, "<=>", 14) }
2103
2104sub pp_seq { binop(@_, "eq", 14) }
2105sub pp_sne { binop(@_, "ne", 14) }
2106sub pp_slt { binop(@_, "lt", 15) }
2107sub pp_sgt { binop(@_, "gt", 15) }
2108sub pp_sge { binop(@_, "ge", 15) }
2109sub pp_sle { binop(@_, "le", 15) }
2110sub pp_scmp { binop(@_, "cmp", 14) }
2111
2112sub pp_sassign { binop(@_, "=", 7, SWAP_CHILDREN) }
7013e6ae 2113sub pp_aassign { binop(@_, "=", 7, SWAP_CHILDREN | LIST_CONTEXT) }
6e90668e 2114
0d863452
RH
2115sub pp_smartmatch {
2116 my ($self, $op, $cx) = @_;
2117 if ($op->flags & OPf_SPECIAL) {
9210de83 2118 return $self->deparse($op->last, $cx);
0d863452
RH
2119 }
2120 else {
2121 binop(@_, "~~", 14);
2122 }
2123}
2124
6e90668e
SM
2125# `.' is special because concats-of-concats are optimized to save copying
2126# by making all but the first concat stacked. The effect is as if the
2127# programmer had written `($a . $b) .= $c', except legal.
3ed82cfc
GS
2128sub pp_concat { maybe_targmy(@_, \&real_concat) }
2129sub real_concat {
6e90668e 2130 my $self = shift;
9d2c6865 2131 my($op, $cx) = @_;
6e90668e
SM
2132 my $left = $op->first;
2133 my $right = $op->last;
2134 my $eq = "";
9d2c6865 2135 my $prec = 18;
3f872cb9 2136 if ($op->flags & OPf_STACKED and $op->first->name ne "concat") {
6e90668e 2137 $eq = "=";
9d2c6865 2138 $prec = 7;
6e90668e 2139 }
9d2c6865
SM
2140 $left = $self->deparse_binop_left($op, $left, $prec);
2141 $right = $self->deparse_binop_right($op, $right, $prec);
2142 return $self->maybe_parens("$left .$eq $right", $cx, $prec);
6e90668e
SM
2143}
2144
2145# `x' is weird when the left arg is a list
2146sub pp_repeat {
2147 my $self = shift;
9d2c6865 2148 my($op, $cx) = @_;
6e90668e
SM
2149 my $left = $op->first;
2150 my $right = $op->last;
9d2c6865
SM
2151 my $eq = "";
2152 my $prec = 19;
2153 if ($op->flags & OPf_STACKED) {
2154 $eq = "=";
2155 $prec = 7;
2156 }
6e90668e
SM
2157 if (null($right)) { # list repeat; count is inside left-side ex-list
2158 my $kid = $left->first->sibling; # skip pushmark
2159 my @exprs;
2160 for (; !null($kid->sibling); $kid = $kid->sibling) {
9d2c6865 2161 push @exprs, $self->deparse($kid, 6);
6e90668e
SM
2162 }
2163 $right = $kid;
2164 $left = "(" . join(", ", @exprs). ")";
2165 } else {
9d2c6865 2166 $left = $self->deparse_binop_left($op, $left, $prec);
6e90668e 2167 }
9d2c6865
SM
2168 $right = $self->deparse_binop_right($op, $right, $prec);
2169 return $self->maybe_parens("$left x$eq $right", $cx, $prec);
6e90668e
SM
2170}
2171
2172sub range {
2173 my $self = shift;
9d2c6865 2174 my ($op, $cx, $type) = @_;
6e90668e
SM
2175 my $left = $op->first;
2176 my $right = $left->sibling;
9d2c6865
SM
2177 $left = $self->deparse($left, 9);
2178 $right = $self->deparse($right, 9);
2179 return $self->maybe_parens("$left $type $right", $cx, 9);
6e90668e
SM
2180}
2181
2182sub pp_flop {
2183 my $self = shift;
9d2c6865 2184 my($op, $cx) = @_;
6e90668e
SM
2185 my $flip = $op->first;
2186 my $type = ($flip->flags & OPf_SPECIAL) ? "..." : "..";
9d2c6865 2187 return $self->range($flip->first, $cx, $type);
6e90668e
SM
2188}
2189
2190# one-line while/until is handled in pp_leave
2191
2192sub logop {
2193 my $self = shift;
9d2c6865 2194 my ($op, $cx, $lowop, $lowprec, $highop, $highprec, $blockname) = @_;
6e90668e
SM
2195 my $left = $op->first;
2196 my $right = $op->first->sibling;
d989cdac 2197 if ($cx < 1 and is_scope($right) and $blockname
58cccf98
SM
2198 and $self->{'expand'} < 7)
2199 { # if ($a) {$b}
9d2c6865
SM
2200 $left = $self->deparse($left, 1);
2201 $right = $self->deparse($right, 0);
2202 return "$blockname ($left) {\n\t$right\n\b}\cK";
d989cdac 2203 } elsif ($cx < 1 and $blockname and not $self->{'parens'}
58cccf98 2204 and $self->{'expand'} < 7) { # $b if $a
9d2c6865
SM
2205 $right = $self->deparse($right, 1);
2206 $left = $self->deparse($left, 1);
2207 return "$right $blockname $left";
2208 } elsif ($cx > $lowprec and $highop) { # $a && $b
2209 $left = $self->deparse_binop_left($op, $left, $highprec);
2210 $right = $self->deparse_binop_right($op, $right, $highprec);
2211 return $self->maybe_parens("$left $highop $right", $cx, $highprec);
2212 } else { # $a and $b
2213 $left = $self->deparse_binop_left($op, $left, $lowprec);
2214 $right = $self->deparse_binop_right($op, $right, $lowprec);
d989cdac 2215 return $self->maybe_parens("$left $lowop $right", $cx, $lowprec);
9d2c6865
SM
2216 }
2217}
2218
2219sub pp_and { logop(@_, "and", 3, "&&", 11, "if") }
f4a44678 2220sub pp_or { logop(@_, "or", 2, "||", 10, "unless") }
c963b151 2221sub pp_dor { logop(@_, "err", 2, "//", 10, "") }
3ed82cfc
GS
2222
2223# xor is syntactically a logop, but it's really a binop (contrary to
2224# old versions of opcode.pl). Syntax is what matters here.
9d2c6865 2225sub pp_xor { logop(@_, "xor", 2, "", 0, "") }
6e90668e
SM
2226
2227sub logassignop {
2228 my $self = shift;
9d2c6865 2229 my ($op, $cx, $opname) = @_;
6e90668e
SM
2230 my $left = $op->first;
2231 my $right = $op->first->sibling->first; # skip sassign
9d2c6865
SM
2232 $left = $self->deparse($left, 7);
2233 $right = $self->deparse($right, 7);
2234 return $self->maybe_parens("$left $opname $right", $cx, 7);
a798dbf2
MB
2235}
2236
6e90668e 2237sub pp_andassign { logassignop(@_, "&&=") }
c963b151
BD
2238sub pp_orassign { logassignop(@_, "||=") }
2239sub pp_dorassign { logassignop(@_, "//=") }
6e90668e
SM
2240
2241sub listop {
2242 my $self = shift;
9d2c6865
SM
2243 my($op, $cx, $name) = @_;
2244 my(@exprs);
2245 my $parens = ($cx >= 5) || $self->{'parens'};
2246 my $kid = $op->first->sibling;
2247 return $name if null $kid;
e31885a0 2248 my $first;
fb725297 2249 $name = "socketpair" if $name eq "sockpair";
b72c97e8
RGS
2250 my $proto = prototype("CORE::$name");
2251 if (defined $proto
2252 && $proto =~ /^;?\*/
e31885a0
RH
2253 && $kid->name eq "rv2gv") {
2254 $first = $self->deparse($kid->first, 6);
2255 }
2256 else {
2257 $first = $self->deparse($kid, 6);
2258 }
e99ebc55 2259 if ($name eq "chmod" && $first =~ /^\d+$/) {
a0035eb8 2260 $first = sprintf("%#o", $first);
e99ebc55 2261 }
9d2c6865
SM
2262 $first = "+$first" if not $parens and substr($first, 0, 1) eq "(";
2263 push @exprs, $first;
2264 $kid = $kid->sibling;
e1f56625 2265 if (defined $proto && $proto =~ /^\*\*/ && $kid->name eq "rv2gv") {
b72c97e8
RGS
2266 push @exprs, $self->deparse($kid->first, 6);
2267 $kid = $kid->sibling;
2268 }
9d2c6865
SM
2269 for (; !null($kid); $kid = $kid->sibling) {
2270 push @exprs, $self->deparse($kid, 6);
2271 }
2272 if ($parens) {
2273 return "$name(" . join(", ", @exprs) . ")";
2274 } else {
2275 return "$name " . join(", ", @exprs);
6e90668e 2276 }
6e90668e 2277}
a798dbf2 2278
6e90668e 2279sub pp_bless { listop(@_, "bless") }
3ed82cfc 2280sub pp_atan2 { maybe_targmy(@_, \&listop, "atan2") }
6e90668e
SM
2281sub pp_substr { maybe_local(@_, listop(@_, "substr")) }
2282sub pp_vec { maybe_local(@_, listop(@_, "vec")) }
3ed82cfc
GS
2283sub pp_index { maybe_targmy(@_, \&listop, "index") }
2284sub pp_rindex { maybe_targmy(@_, \&listop, "rindex") }
2285sub pp_sprintf { maybe_targmy(@_, \&listop, "sprintf") }
6e90668e 2286sub pp_formline { listop(@_, "formline") } # see also deparse_format
3ed82cfc 2287sub pp_crypt { maybe_targmy(@_, \&listop, "crypt") }
6e90668e
SM
2288sub pp_unpack { listop(@_, "unpack") }
2289sub pp_pack { listop(@_, "pack") }
3ed82cfc 2290sub pp_join { maybe_targmy(@_, \&listop, "join") }
6e90668e 2291sub pp_splice { listop(@_, "splice") }
3ed82cfc
GS
2292sub pp_push { maybe_targmy(@_, \&listop, "push") }
2293sub pp_unshift { maybe_targmy(@_, \&listop, "unshift") }
6e90668e
SM
2294sub pp_reverse { listop(@_, "reverse") }
2295sub pp_warn { listop(@_, "warn") }
2296sub pp_die { listop(@_, "die") }
9d2c6865
SM
2297# Actually, return is exempt from the LLAFR (see examples in this very
2298# module!), but for consistency's sake, ignore that fact
6e90668e
SM
2299sub pp_return { listop(@_, "return") }
2300sub pp_open { listop(@_, "open") }
2301sub pp_pipe_op { listop(@_, "pipe") }
2302sub pp_tie { listop(@_, "tie") }
82bafd27 2303sub pp_binmode { listop(@_, "binmode") }
6e90668e
SM
2304sub pp_dbmopen { listop(@_, "dbmopen") }
2305sub pp_sselect { listop(@_, "select") }
2306sub pp_select { listop(@_, "select") }
2307sub pp_read { listop(@_, "read") }
2308sub pp_sysopen { listop(@_, "sysopen") }
2309sub pp_sysseek { listop(@_, "sysseek") }
2310sub pp_sysread { listop(@_, "sysread") }
2311sub pp_syswrite { listop(@_, "syswrite") }
2312sub pp_send { listop(@_, "send") }
2313sub pp_recv { listop(@_, "recv") }
2314sub pp_seek { listop(@_, "seek") }
6e90668e
SM
2315sub pp_fcntl { listop(@_, "fcntl") }
2316sub pp_ioctl { listop(@_, "ioctl") }
3ed82cfc 2317sub pp_flock { maybe_targmy(@_, \&listop, "flock") }
6e90668e
SM
2318sub pp_socket { listop(@_, "socket") }
2319sub pp_sockpair { listop(@_, "sockpair") }
2320sub pp_bind { listop(@_, "bind") }
2321sub pp_connect { listop(@_, "connect") }
2322sub pp_listen { listop(@_, "listen") }
2323sub pp_accept { listop(@_, "accept") }
2324sub pp_shutdown { listop(@_, "shutdown") }
2325sub pp_gsockopt { listop(@_, "getsockopt") }
2326sub pp_ssockopt { listop(@_, "setsockopt") }
3ed82cfc
GS
2327sub pp_chown { maybe_targmy(@_, \&listop, "chown") }
2328sub pp_unlink { maybe_targmy(@_, \&listop, "unlink") }
2329sub pp_chmod { maybe_targmy(@_, \&listop, "chmod") }
2330sub pp_utime { maybe_targmy(@_, \&listop, "utime") }
2331sub pp_rename { maybe_targmy(@_, \&listop, "rename") }
2332sub pp_link { maybe_targmy(@_, \&listop, "link") }
2333sub pp_symlink { maybe_targmy(@_, \&listop, "symlink") }
2334sub pp_mkdir { maybe_targmy(@_, \&listop, "mkdir") }
6e90668e
SM
2335sub pp_open_dir { listop(@_, "opendir") }
2336sub pp_seekdir { listop(@_, "seekdir") }
3ed82cfc
GS
2337sub pp_waitpid { maybe_targmy(@_, \&listop, "waitpid") }
2338sub pp_system { maybe_targmy(@_, \&listop, "system") }
2339sub pp_exec { maybe_targmy(@_, \&listop, "exec") }
2340sub pp_kill { maybe_targmy(@_, \&listop, "kill") }
2341sub pp_setpgrp { maybe_targmy(@_, \&listop, "setpgrp") }
2342sub pp_getpriority { maybe_targmy(@_, \&listop, "getpriority") }
2343sub pp_setpriority { maybe_targmy(@_, \&listop, "setpriority") }
6e90668e
SM
2344sub pp_shmget { listop(@_, "shmget") }
2345sub pp_shmctl { listop(@_, "shmctl") }
2346sub pp_shmread { listop(@_, "shmread") }
2347sub pp_shmwrite { listop(@_, "shmwrite") }
2348sub pp_msgget { listop(@_, "msgget") }
2349sub pp_msgctl { listop(@_, "msgctl") }
2350sub pp_msgsnd { listop(@_, "msgsnd") }
2351sub pp_msgrcv { listop(@_, "msgrcv") }
2352sub pp_semget { listop(@_, "semget") }
2353sub pp_semctl { listop(@_, "semctl") }
2354sub pp_semop { listop(@_, "semop") }
2355sub pp_ghbyaddr { listop(@_, "gethostbyaddr") }
2356sub pp_gnbyaddr { listop(@_, "getnetbyaddr") }
2357sub pp_gpbynumber { listop(@_, "getprotobynumber") }
2358sub pp_gsbyname { listop(@_, "getservbyname") }
2359sub pp_gsbyport { listop(@_, "getservbyport") }
2360sub pp_syscall { listop(@_, "syscall") }
2361
2362sub pp_glob {
2363 my $self = shift;
9d2c6865 2364 my($op, $cx) = @_;
6e90668e
SM
2365 my $text = $self->dq($op->first->sibling); # skip pushmark
2366 if ($text =~ /^\$?(\w|::|\`)+$/ # could look like a readline
d989cdac 2367 or $text =~ /[<>]/) {
6e90668e
SM
2368 return 'glob(' . single_delim('qq', '"', $text) . ')';
2369 } else {
2370 return '<' . $text . '>';
2371 }
2372}
2373
f5aa8f4e
SM
2374# Truncate is special because OPf_SPECIAL makes a bareword first arg
2375# be a filehandle. This could probably be better fixed in the core
2376# by moving the GV lookup into ck_truc.
2377
2378sub pp_truncate {
2379 my $self = shift;
2380 my($op, $cx) = @_;
2381 my(@exprs);
2382 my $parens = ($cx >= 5) || $self->{'parens'};
2383 my $kid = $op->first->sibling;
acba1d67 2384 my $fh;
f5aa8f4e
SM
2385 if ($op->flags & OPf_SPECIAL) {
2386 # $kid is an OP_CONST
18228111 2387 $fh = $self->const_sv($kid)->PV;
f5aa8f4e
SM
2388 } else {
2389 $fh = $self->deparse($kid, 6);
2390 $fh = "+$fh" if not $parens and substr($fh, 0, 1) eq "(";
2391 }
2392 my $len = $self->deparse($kid->sibling, 6);
2393 if ($parens) {
2394 return "truncate($fh, $len)";
2395 } else {
2396 return "truncate $fh, $len";
2397 }
f5aa8f4e
SM
2398}
2399
6e90668e
SM
2400sub indirop {
2401 my $self = shift;
9d2c6865 2402 my($op, $cx, $name) = @_;
6e90668e
SM
2403 my($expr, @exprs);
2404 my $kid = $op->first->sibling;
2405 my $indir = "";
2406 if ($op->flags & OPf_STACKED) {
2407 $indir = $kid;
2408 $indir = $indir->first; # skip rv2gv
2409 if (is_scope($indir)) {
9d2c6865 2410 $indir = "{" . $self->deparse($indir, 0) . "}";
d989cdac 2411 $indir = "{;}" if $indir eq "{}";
c73811ab
RH
2412 } elsif ($indir->name eq "const" && $indir->private & OPpCONST_BARE) {
2413 $indir = $self->const_sv($indir)->PV;
6e90668e 2414 } else {
9d2c6865 2415 $indir = $self->deparse($indir, 24);
6e90668e
SM
2416 }
2417 $indir = $indir . " ";
2418 $kid = $kid->sibling;
2419 }
7e80da18 2420 if ($name eq "sort" && $op->private & (OPpSORT_NUMERIC | OPpSORT_INTEGER)) {
3ac6e0f9 2421 $indir = ($op->private & OPpSORT_DESCEND) ? '{$b <=> $a} '
7e80da18
RH
2422 : '{$a <=> $b} ';
2423 }
3ac6e0f9 2424 elsif ($name eq "sort" && $op->private & OPpSORT_DESCEND) {
7e80da18
RH
2425 $indir = '{$b cmp $a} ';
2426 }
6e90668e 2427 for (; !null($kid); $kid = $kid->sibling) {
9d2c6865 2428 $expr = $self->deparse($kid, 6);
6e90668e
SM
2429 push @exprs, $expr;
2430 }
3ac6e0f9
RGS
2431 my $name2 = $name;
2432 if ($name eq "sort" && $op->private & OPpSORT_REVERSE) {
2433 $name2 = 'reverse sort';
2434 }
2b6e98cb 2435 if ($name eq "sort" && ($op->private & OPpSORT_INPLACE)) {
3ac6e0f9 2436 return "$exprs[0] = $name2 $indir $exprs[0]";
2b6e98cb
DM
2437 }
2438
d989cdac
SM
2439 my $args = $indir . join(", ", @exprs);
2440 if ($indir ne "" and $name eq "sort") {
2441 # We don't want to say "sort(f 1, 2, 3)", since perl -w will
2442 # give bareword warnings in that case. Therefore if context
2443 # requires, we'll put parens around the outside "(sort f 1, 2,
2444 # 3)". Unfortunately, we'll currently think the parens are
3c4b39be 2445 # necessary more often that they really are, because we don't
d989cdac
SM
2446 # distinguish which side of an assignment we're on.
2447 if ($cx >= 5) {
3ac6e0f9 2448 return "($name2 $args)";
d989cdac 2449 } else {
3ac6e0f9 2450 return "$name2 $args";
d989cdac
SM
2451 }
2452 } else {
3ac6e0f9 2453 return $self->maybe_parens_func($name2, $args, $cx, 5);
d989cdac
SM
2454 }
2455
6e90668e
SM
2456}
2457
2458sub pp_prtf { indirop(@_, "printf") }
2459sub pp_print { indirop(@_, "print") }
9b08e3d3 2460sub pp_say { indirop(@_, "say") }
6e90668e
SM
2461sub pp_sort { indirop(@_, "sort") }
2462
2463sub mapop {
2464 my $self = shift;
9d2c6865 2465 my($op, $cx, $name) = @_;
6e90668e
SM
2466 my($expr, @exprs);
2467 my $kid = $op->first; # this is the (map|grep)start
2468 $kid = $kid->first->sibling; # skip a pushmark
2469 my $code = $kid->first; # skip a null
2470 if (is_scope $code) {
f4a44678 2471 $code = "{" . $self->deparse($code, 0) . "} ";
6e90668e 2472 } else {
9d2c6865 2473 $code = $self->deparse($code, 24) . ", ";
6e90668e
SM
2474 }
2475 $kid = $kid->sibling;
2476 for (; !null($kid); $kid = $kid->sibling) {
9d2c6865 2477 $expr = $self->deparse($kid, 6);
9a58b761 2478 push @exprs, $expr if defined $expr;
6e90668e 2479 }
9d2c6865 2480 return $self->maybe_parens_func($name, $code . join(", ", @exprs), $cx, 5);
6e90668e
SM
2481}
2482
d989cdac
SM
2483sub pp_mapwhile { mapop(@_, "map") }
2484sub pp_grepwhile { mapop(@_, "grep") }
11e09183
SP
2485sub pp_mapstart { baseop(@_, "map") }
2486sub pp_grepstart { baseop(@_, "grep") }
6e90668e
SM
2487
2488sub pp_list {
2489 my $self = shift;
9d2c6865 2490 my($op, $cx) = @_;
6e90668e
SM
2491 my($expr, @exprs);
2492 my $kid = $op->first->sibling; # skip pushmark
2493 my $lop;
3462b4ac 2494 my $local = "either"; # could be local(...), my(...), state(...) or our(...)
6e90668e
SM
2495 for ($lop = $kid; !null($lop); $lop = $lop->sibling) {
2496 # This assumes that no other private flags equal 128, and that
2497 # OPs that store things other than flags in their op_private,
2498 # like OP_AELEMFAST, won't be immediate children of a list.
b8e103fc
RH
2499 #
2500 # OP_ENTERSUB can break this logic, so check for it.
2501 # I suspect that open and exit can too.
2502
2503 if (!($lop->private & (OPpLVAL_INTRO|OPpOUR_INTRO)
ce4e655d 2504 or $lop->name eq "undef")
b8e103fc
RH
2505 or $lop->name eq "entersub"
2506 or $lop->name eq "exit"
2507 or $lop->name eq "open")
6e90668e
SM
2508 {
2509 $local = ""; # or not
2510 last;
2511 }
3462b4ac
RGS
2512 if ($lop->name =~ /^pad[ash]v$/) {
2513 if ($lop->private & OPpPAD_STATE) { # state()
2514 ($local = "", last) if $local =~ /^(?:local|our|my)$/;
2515 $local = "state";
2516 } else { # my()
2517 ($local = "", last) if $local =~ /^(?:local|our|state)$/;
2518 $local = "my";
2519 }
b8e103fc
RH
2520 } elsif ($lop->name =~ /^(gv|rv2)[ash]v$/
2521 && $lop->private & OPpOUR_INTRO
2522 or $lop->name eq "null" && $lop->first->name eq "gvsv"
2523 && $lop->first->private & OPpOUR_INTRO) { # our()
3462b4ac 2524 ($local = "", last) if $local =~ /^(?:my|local|state)$/;
ce4e655d 2525 $local = "our";
3ac6e0f9
RGS
2526 } elsif ($lop->name ne "undef"
2527 # specifically avoid the "reverse sort" optimisation,
2528 # where "reverse" is nullified
36d57d93 2529 && !($lop->name eq 'sort' && ($lop->flags & OPpSORT_REVERSE)))
3ac6e0f9
RGS
2530 {
2531 # local()
3462b4ac 2532 ($local = "", last) if $local =~ /^(?:my|our|state)$/;
6e90668e
SM
2533 $local = "local";
2534 }
2535 }
2536 $local = "" if $local eq "either"; # no point if it's all undefs
f5aa8f4e 2537 return $self->deparse($kid, $cx) if null $kid->sibling and not $local;
6e90668e
SM
2538 for (; !null($kid); $kid = $kid->sibling) {
2539 if ($local) {
3f872cb9 2540 if (class($kid) eq "UNOP" and $kid->first->name eq "gvsv") {
6e90668e
SM
2541 $lop = $kid->first;
2542 } else {
2543 $lop = $kid;
2544 }
2545 $self->{'avoid_local'}{$$lop}++;
9d2c6865 2546 $expr = $self->deparse($kid, 6);
6e90668e
SM
2547 delete $self->{'avoid_local'}{$$lop};
2548 } else {
9d2c6865 2549 $expr = $self->deparse($kid, 6);
6e90668e
SM
2550 }
2551 push @exprs, $expr;
2552 }
9d2c6865
SM
2553 if ($local) {
2554 return "$local(" . join(", ", @exprs) . ")";
2555 } else {
2556 return $self->maybe_parens( join(", ", @exprs), $cx, 6);
2557 }
6e90668e
SM
2558}
2559
6f611a1a
GS
2560sub is_ifelse_cont {
2561 my $op = shift;
2562 return ($op->name eq "null" and class($op) eq "UNOP"
2563 and $op->first->name =~ /^(and|cond_expr)$/
2564 and is_scope($op->first->first->sibling));
2565}
2566
6e90668e
SM
2567sub pp_cond_expr {
2568 my $self = shift;
9d2c6865 2569 my($op, $cx) = @_;
6e90668e
SM
2570 my $cond = $op->first;
2571 my $true = $cond->sibling;
2572 my $false = $true->sibling;
9d2c6865 2573 my $cuddle = $self->{'cuddle'};
d989cdac 2574 unless ($cx < 1 and (is_scope($true) and $true->name ne "null") and
58cccf98
SM
2575 (is_scope($false) || is_ifelse_cont($false))
2576 and $self->{'expand'} < 7) {
f5aa8f4e 2577 $cond = $self->deparse($cond, 8);
cfaba469 2578 $true = $self->deparse($true, 6);
9d2c6865
SM
2579 $false = $self->deparse($false, 8);
2580 return $self->maybe_parens("$cond ? $true : $false", $cx, 8);
6f611a1a
GS
2581 }
2582
f5aa8f4e 2583 $cond = $self->deparse($cond, 1);
d989cdac 2584 $true = $self->deparse($true, 0);
6f611a1a
GS
2585 my $head = "if ($cond) {\n\t$true\n\b}";
2586 my @elsifs;
2587 while (!null($false) and is_ifelse_cont($false)) {
2588 my $newop = $false->first;
2589 my $newcond = $newop->first;
2590 my $newtrue = $newcond->sibling;
2591 $false = $newtrue->sibling; # last in chain is OP_AND => no else
2592 $newcond = $self->deparse($newcond, 1);
2593 $newtrue = $self->deparse($newtrue, 0);
2594 push @elsifs, "elsif ($newcond) {\n\t$newtrue\n\b}";
2595 }
d989cdac 2596 if (!null($false)) {
6f611a1a
GS
2597 $false = $cuddle . "else {\n\t" .
2598 $self->deparse($false, 0) . "\n\b}\cK";
2599 } else {
2600 $false = "\cK";
6e90668e 2601 }
d989cdac 2602 return $head . join($cuddle, "", @elsifs) . $false;
6e90668e
SM
2603}
2604
95562366
NC
2605sub pp_once {
2606 my ($self, $op, $cx) = @_;
2607 my $cond = $op->first;
2608 my $true = $cond->sibling;
2609
2610 return $self->deparse($true, $cx);
2611}
2612
58cccf98 2613sub loop_common {
6e90668e 2614 my $self = shift;
58cccf98 2615 my($op, $cx, $init) = @_;
6e90668e
SM
2616 my $enter = $op->first;
2617 my $kid = $enter->sibling;
0ced6c29
RGS
2618 local(@$self{qw'curstash warnings hints hinthash'})
2619 = @$self{qw'curstash warnings hints hinthash'};
6e90668e 2620 my $head = "";
9d2c6865 2621 my $bare = 0;
58cccf98
SM
2622 my $body;
2623 my $cond = undef;
d989cdac 2624 if ($kid->name eq "lineseq") { # bare or infinite loop
241416b8 2625 if ($kid->last->name eq "unstack") { # infinite
e99ebc55 2626 $head = "while (1) "; # Can't use for(;;) if there's a continue
58cccf98 2627 $cond = "";
9d2c6865
SM
2628 } else {
2629 $bare = 1;
6e90668e 2630 }
58cccf98 2631 $body = $kid;
3f872cb9 2632 } elsif ($enter->name eq "enteriter") { # foreach
6e90668e
SM
2633 my $ary = $enter->first->sibling; # first was pushmark
2634 my $var = $ary->sibling;
36d57d93
RGS
2635 if ($ary->name eq 'null' and $enter->private & OPpITER_REVERSED) {
2636 # "reverse" was optimised away
aae53c41 2637 $ary = listop($self, $ary->first->sibling, 1, 'reverse');
36d57d93 2638 } elsif ($enter->flags & OPf_STACKED
f5aa8f4e
SM
2639 and not null $ary->first->sibling->sibling)
2640 {
d7f5b6da
SM
2641 $ary = $self->deparse($ary->first->sibling, 9) . " .. " .
2642 $self->deparse($ary->first->sibling->sibling, 9);
d8d95777
GA
2643 } else {
2644 $ary = $self->deparse($ary, 1);
2645 }
6e90668e 2646 if (null $var) {
f6f9bdb7 2647 if ($enter->flags & OPf_SPECIAL) { # thread special var
9d2c6865 2648 $var = $self->pp_threadsv($enter, 1);
f6f9bdb7 2649 } else { # regular my() variable
9d2c6865 2650 $var = $self->pp_padsv($enter, 1);
6e90668e 2651 }
3f872cb9 2652 } elsif ($var->name eq "rv2gv") {
9d2c6865 2653 $var = $self->pp_rv2sv($var, 1);
241416b8
DM
2654 if ($enter->private & OPpOUR_INTRO) {
2655 # our declarations don't have package names
2656 $var =~ s/^(.).*::/$1/;
2657 $var = "our $var";
2658 }
3f872cb9 2659 } elsif ($var->name eq "gv") {
9d2c6865 2660 $var = "\$" . $self->deparse($var, 1);
6e90668e 2661 }
58cccf98 2662 $body = $kid->first->first->sibling; # skip OP_AND and OP_ITER
cf24a840
SM
2663 if (!is_state $body->first and $body->first->name ne "stub") {
2664 confess unless $var eq '$_';
2665 $body = $body->first;
2666 return $self->deparse($body, 2) . " foreach ($ary)";
2667 }
2668 $head = "foreach $var ($ary) ";
3f872cb9 2669 } elsif ($kid->name eq "null") { # while/until
6e90668e 2670 $kid = $kid->first;
58cccf98
SM
2671 my $name = {"and" => "while", "or" => "until"}->{$kid->name};
2672 $cond = $self->deparse($kid->first, 1);
2673 $head = "$name ($cond) ";
2674 $body = $kid->first->sibling;
3f872cb9 2675 } elsif ($kid->name eq "stub") { # bare and empty
9d2c6865 2676 return "{;}"; # {} could be a hashref
6e90668e 2677 }
58cccf98 2678 # If there isn't a continue block, then the next pointer for the loop
241416b8 2679 # will point to the unstack, which is kid's last child, except
58cccf98 2680 # in a bare loop, when it will point to the leaveloop. When neither of
241416b8 2681 # these conditions hold, then the second-to-last child is the continue
58cccf98
SM
2682 # block (or the last in a bare loop).
2683 my $cont_start = $enter->nextop;
2684 my $cont;
241416b8 2685 if ($$cont_start != $$op && ${$cont_start} != ${$body->last}) {
58cccf98
SM
2686 if ($bare) {
2687 $cont = $body->last;
2688 } else {
2689 $cont = $body->first;
241416b8 2690 while (!null($cont->sibling->sibling)) {
58cccf98
SM
2691 $cont = $cont->sibling;
2692 }
2693 }
2694 my $state = $body->first;
2695 my $cuddle = $self->{'cuddle'};
2696 my @states;
2697 for (; $$state != $$cont; $state = $state->sibling) {
2698 push @states, $state;
2699 }
ce4e655d 2700 $body = $self->lineseq(undef, @states);
58cccf98
SM
2701 if (defined $cond and not is_scope $cont and $self->{'expand'} < 3) {
2702 $head = "for ($init; $cond; " . $self->deparse($cont, 1) .") ";
2703 $cont = "\cK";
2704 } else {
2705 $cont = $cuddle . "continue {\n\t" .
2706 $self->deparse($cont, 0) . "\n\b}\cK";
6e90668e 2707 }
6e90668e 2708 } else {
7a9b44b9 2709 return "" if !defined $body;
c73811ab
RH
2710 if (length $init) {
2711 $head = "for ($init; $cond;) ";
2712 }
9d2c6865 2713 $cont = "\cK";
58cccf98 2714 $body = $self->deparse($body, 0);
6e90668e 2715 }
ce4e655d 2716 $body =~ s/;?$/;\n/;
34a48b4b
RH
2717
2718 return $head . "{\n\t" . $body . "\b}" . $cont;
58cccf98
SM
2719}
2720
09d856fb 2721sub pp_leaveloop { shift->loop_common(@_, "") }
58cccf98
SM
2722
2723sub for_loop {
2724 my $self = shift;
2725 my($op, $cx) = @_;
2726 my $init = $self->deparse($op, 1);
c73811ab 2727 return $self->loop_common($op->sibling->first->sibling, $cx, $init);
6e90668e
SM
2728}
2729
2730sub pp_leavetry {
2731 my $self = shift;
9d2c6865 2732 return "eval {\n\t" . $self->pp_leave(@_) . "\n\b}";
bd0865ec 2733}
6e90668e 2734
bd0865ec
GS
2735BEGIN { eval "sub OP_CONST () {" . opnumber("const") . "}" }
2736BEGIN { eval "sub OP_STRINGIFY () {" . opnumber("stringify") . "}" }
a9760014 2737BEGIN { eval "sub OP_RV2SV () {" . opnumber("rv2sv") . "}" }
90c0eb26 2738BEGIN { eval "sub OP_LIST () {" . opnumber("list") . "}" }
f5aa8f4e 2739
a798dbf2 2740sub pp_null {
6e90668e 2741 my $self = shift;
d989cdac 2742 my($op, $cx) = @_;
6e90668e 2743 if (class($op) eq "OP") {
f4a44678
SM
2744 # old value is lost
2745 return $self->{'ex_const'} if $op->targ == OP_CONST;
3f872cb9 2746 } elsif ($op->first->name eq "pushmark") {
9d2c6865 2747 return $self->pp_list($op, $cx);
3f872cb9 2748 } elsif ($op->first->name eq "enter") {
9d2c6865 2749 return $self->pp_leave($op, $cx);
31c6271a
RD
2750 } elsif ($op->first->name eq "leave") {
2751 return $self->pp_leave($op->first, $cx);
2752 } elsif ($op->first->name eq "scope") {
2753 return $self->pp_scope($op->first, $cx);
bd0865ec 2754 } elsif ($op->targ == OP_STRINGIFY) {
6f611a1a 2755 return $self->dquote($op, $cx);
6e90668e 2756 } elsif (!null($op->first->sibling) and
3f872cb9 2757 $op->first->sibling->name eq "readline" and
6e90668e 2758 $op->first->sibling->flags & OPf_STACKED) {
9d2c6865
SM
2759 return $self->maybe_parens($self->deparse($op->first, 7) . " = "
2760 . $self->deparse($op->first->sibling, 7),
2761 $cx, 7);
6e90668e 2762 } elsif (!null($op->first->sibling) and
3f872cb9 2763 $op->first->sibling->name eq "trans" and
6e90668e 2764 $op->first->sibling->flags & OPf_STACKED) {
9d2c6865
SM
2765 return $self->maybe_parens($self->deparse($op->first, 20) . " =~ "
2766 . $self->deparse($op->first->sibling, 20),
2767 $cx, 20);
d989cdac
SM
2768 } elsif ($op->flags & OPf_SPECIAL && $cx < 1 && !$op->targ) {
2769 return "do {\n\t". $self->deparse($op->first, $cx) ."\n\b};";
ad8caead
RGS
2770 } elsif (!null($op->first->sibling) and
2771 $op->first->sibling->name eq "null" and
2772 class($op->first->sibling) eq "UNOP" and
2773 $op->first->sibling->first->flags & OPf_STACKED and
2774 $op->first->sibling->first->name eq "rcatline") {
2775 return $self->maybe_parens($self->deparse($op->first, 18) . " .= "
2776 . $self->deparse($op->first->sibling, 18),
2777 $cx, 18);
6e90668e 2778 } else {
9d2c6865 2779 return $self->deparse($op->first, $cx);
6e90668e 2780 }
a798dbf2
MB
2781}
2782
6e90668e
SM
2783sub padname {
2784 my $self = shift;
2785 my $targ = shift;
68223ea3 2786 return $self->padname_sv($targ)->PVX;
6e90668e
SM
2787}
2788
2789sub padany {
2790 my $self = shift;
2791 my $op = shift;
2792 return substr($self->padname($op->targ), 1); # skip $/@/%
2793}
2794
2795sub pp_padsv {
2796 my $self = shift;
9d2c6865
SM
2797 my($op, $cx) = @_;
2798 return $self->maybe_my($op, $cx, $self->padname($op->targ));
6e90668e
SM
2799}
2800
2801sub pp_padav { pp_padsv(@_) }
2802sub pp_padhv { pp_padsv(@_) }
2803
9d2c6865
SM
2804my @threadsv_names;
2805
2806BEGIN {
2807 @threadsv_names = ("_", "1", "2", "3", "4", "5", "6", "7", "8", "9",
2808 "&", "`", "'", "+", "/", ".", ",", "\\", '"', ";",
2809 "^", "-", "%", "=", "|", "~", ":", "^A", "^E",
2810 "!", "@");
2811}
f6f9bdb7
SM
2812
2813sub pp_threadsv {
2814 my $self = shift;
9d2c6865
SM
2815 my($op, $cx) = @_;
2816 return $self->maybe_local($op, $cx, "\$" . $threadsv_names[$op->targ]);
d989cdac 2817}
f6f9bdb7 2818
6f611a1a 2819sub gv_or_padgv {
18228111
GS
2820 my $self = shift;
2821 my $op = shift;
6f611a1a
GS
2822 if (class($op) eq "PADOP") {
2823 return $self->padval($op->padix);
2824 } else { # class($op) eq "SVOP"
2825 return $op->gv;
18228111 2826 }
18228111
GS
2827}
2828
6e90668e
SM
2829sub pp_gvsv {
2830 my $self = shift;
9d2c6865 2831 my($op, $cx) = @_;
6f611a1a 2832 my $gv = $self->gv_or_padgv($op);
8510e997
RH
2833 return $self->maybe_local($op, $cx, $self->stash_variable("\$",
2834 $self->gv_name($gv)));
6e90668e
SM
2835}
2836
2837sub pp_gv {
2838 my $self = shift;
9d2c6865 2839 my($op, $cx) = @_;
6f611a1a 2840 my $gv = $self->gv_or_padgv($op);
18228111 2841 return $self->gv_name($gv);
6e90668e
SM
2842}
2843
2844sub pp_aelemfast {
2845 my $self = shift;
9d2c6865 2846 my($op, $cx) = @_;
6a077020
DM
2847 my $name;
2848 if ($op->flags & OPf_SPECIAL) { # optimised PADAV
2849 $name = $self->padname($op->targ);
2850 $name =~ s/^@/\$/;
2851 }
2852 else {
2853 my $gv = $self->gv_or_padgv($op);
2854 $name = $self->gv_name($gv);
2855 $name = $self->{'curstash'}."::$name"
2856 if $name !~ /::/ && $self->lex_in_scope('@'.$name);
2857 $name = '$' . $name;
2858 }
ce4e655d 2859
6a077020 2860 return $name . "[" . ($op->private + $self->{'arybase'}) . "]";
6e90668e
SM
2861}
2862
2863sub rv2x {
2864 my $self = shift;
9d2c6865 2865 my($op, $cx, $type) = @_;
90c0eb26
RH
2866
2867 if (class($op) eq 'NULL' || !$op->can("first")) {
ff97752d 2868 carp("Unexpected op in pp_rv2x");
90c0eb26
RH
2869 return 'XXX';
2870 }
6e90668e 2871 my $kid = $op->first;
d989cdac
SM
2872 if ($kid->name eq "gv") {
2873 return $self->stash_variable($type, $self->deparse($kid, 0));
2874 } elsif (is_scalar $kid) {
2875 my $str = $self->deparse($kid, 0);
2876 if ($str =~ /^\$([^\w\d])\z/) {
2877 # "$$+" isn't a legal way to write the scalar dereference
2878 # of $+, since the lexer can't tell you aren't trying to
2879 # do something like "$$ + 1" to get one more than your
2880 # PID. Either "${$+}" or "$${+}" are workable
2881 # disambiguations, but if the programmer did the former,
2882 # they'd be in the "else" clause below rather than here.
2883 # It's not clear if this should somehow be unified with
2884 # the code in dq and re_dq that also adds lexer
2885 # disambiguation braces.
2886 $str = '$' . "{$1}"; #'
2887 }
2888 return $type . $str;
2889 } else {
2890 return $type . "{" . $self->deparse($kid, 0) . "}";
2891 }
6e90668e
SM
2892}
2893
2894sub pp_rv2sv { maybe_local(@_, rv2x(@_, "\$")) }
2895sub pp_rv2hv { maybe_local(@_, rv2x(@_, "%")) }
2896sub pp_rv2gv { maybe_local(@_, rv2x(@_, "*")) }
2897
2898# skip rv2av
2899sub pp_av2arylen {
2900 my $self = shift;
9d2c6865 2901 my($op, $cx) = @_;
3f872cb9 2902 if ($op->first->name eq "padav") {
9d2c6865 2903 return $self->maybe_local($op, $cx, '$#' . $self->padany($op->first));
6e90668e 2904 } else {
f5aa8f4e
SM
2905 return $self->maybe_local($op, $cx,
2906 $self->rv2x($op->first, $cx, '$#'));
6e90668e
SM
2907 }
2908}
2909
2910# skip down to the old, ex-rv2cv
90c0eb26
RH
2911sub pp_rv2cv {
2912 my ($self, $op, $cx) = @_;
2913 if (!null($op->first) && $op->first->name eq 'null' &&
2914 $op->first->targ eq OP_LIST)
2915 {
2916 return $self->rv2x($op->first->first->sibling, $cx, "&")
2917 }
2918 else {
2919 return $self->rv2x($op, $cx, "")
2920 }
2921}
6e90668e 2922
d989cdac
SM
2923sub list_const {
2924 my $self = shift;
2925 my($cx, @list) = @_;
2926 my @a = map $self->const($_, 6), @list;
2927 if (@a == 0) {
2928 return "()";
2929 } elsif (@a == 1) {
2930 return $a[0];
2931 } elsif ( @a > 2 and !grep(!/^-?\d+$/, @a)) {
2932 # collapse (-1,0,1,2) into (-1..2)
2933 my ($s, $e) = @a[0,-1];
2934 my $i = $s;
2935 return $self->maybe_parens("$s..$e", $cx, 9)
2936 unless grep $i++ != $_, @a;
2937 }
2938 return $self->maybe_parens(join(", ", @a), $cx, 6);
2939}
2940
6e90668e
SM
2941sub pp_rv2av {
2942 my $self = shift;
9d2c6865 2943 my($op, $cx) = @_;
6e90668e 2944 my $kid = $op->first;
3f872cb9 2945 if ($kid->name eq "const") { # constant list
18228111 2946 my $av = $self->const_sv($kid);
d989cdac 2947 return $self->list_const($cx, $av->ARRAY);
6e90668e 2948 } else {
9d2c6865 2949 return $self->maybe_local($op, $cx, $self->rv2x($op, $cx, "\@"));
6e90668e
SM
2950 }
2951 }
2952
3ed82cfc
GS
2953sub is_subscriptable {
2954 my $op = shift;
2955 if ($op->name =~ /^[ahg]elem/) {
2956 return 1;
2957 } elsif ($op->name eq "entersub") {
2958 my $kid = $op->first;
2959 return 0 unless null $kid->sibling;
2960 $kid = $kid->first;
2961 $kid = $kid->sibling until null $kid->sibling;
2962 return 0 if is_scope($kid);
2963 $kid = $kid->first;
2964 return 0 if $kid->name eq "gv";
2965 return 0 if is_scalar($kid);
2966 return is_subscriptable($kid);
2967 } else {
2968 return 0;
2969 }
2970}
6e90668e 2971
21b7468a
BL
2972sub elem_or_slice_array_name
2973{
6e90668e 2974 my $self = shift;
21b7468a
BL
2975 my ($array, $left, $padname, $allow_arrow) = @_;
2976
3f872cb9 2977 if ($array->name eq $padname) {
21b7468a 2978 return $self->padany($array);
6e90668e 2979 } elsif (is_scope($array)) { # ${expr}[0]
21b7468a 2980 return "{" . $self->deparse($array, 0) . "}";
ce4e655d
RH
2981 } elsif ($array->name eq "gv") {
2982 $array = $self->gv_name($self->gv_or_padgv($array));
2983 if ($array !~ /::/) {
2984 my $prefix = ($left eq '[' ? '@' : '%');
2985 $array = $self->{curstash}.'::'.$array
2986 if $self->lex_in_scope($prefix . $array);
2987 }
21b7468a
BL
2988 return $array;
2989 } elsif (!$allow_arrow || is_scalar $array) { # $x[0], $$x[0], ...
2990 return $self->deparse($array, 24);
6e90668e 2991 } else {
21b7468a 2992 return undef;
6e90668e 2993 }
21b7468a
BL
2994}
2995
2996sub elem_or_slice_single_index
2997{
2998 my $self = shift;
2999 my ($idx) = @_;
3000
9d2c6865 3001 $idx = $self->deparse($idx, 1);
7a9b44b9
RH
3002
3003 # Outer parens in an array index will confuse perl
3004 # if we're interpolating in a regular expression, i.e.
3005 # /$x$foo[(-1)]/ is *not* the same as /$x$foo[-1]/
3006 #
3007 # If $self->{parens}, then an initial '(' will
3008 # definitely be paired with a final ')'. If
3009 # !$self->{parens}, the misleading parens won't
3010 # have been added in the first place.
3011 #
3012 # [You might think that we could get "(...)...(...)"
3013 # where the initial and final parens do not match
3014 # each other. But we can't, because the above would
3015 # only happen if there's an infix binop between the
3016 # two pairs of parens, and *that* means that the whole
3017 # expression would be parenthesized as well.]
3018 #
3019 $idx =~ s/^\((.*)\)$/$1/ if $self->{'parens'};
3020
098251bc
RH
3021 # Hash-element braces will autoquote a bareword inside themselves.
3022 # We need to make sure that C<$hash{warn()}> doesn't come out as
3023 # C<$hash{warn}>, which has a quite different meaning. Currently
3024 # B::Deparse will always quote strings, even if the string was a
3025 # bareword in the original (i.e. the OPpCONST_BARE flag is ignored
3026 # for constant strings.) So we can cheat slightly here - if we see
3027 # a bareword, we know that it is supposed to be a function call.
3028 #
3029 $idx =~ s/^([A-Za-z_]\w*)$/$1()/;
3030
21b7468a
BL
3031 return $idx;
3032}
3033
3034sub elem {
3035 my $self = shift;
3036 my ($op, $cx, $left, $right, $padname) = @_;
3037 my($array, $idx) = ($op->first, $op->first->sibling);
3038
3039 $idx = $self->elem_or_slice_single_index($idx);
3040
3041 unless ($array->name eq $padname) { # Maybe this has been fixed
3042 $array = $array->first; # skip rv2av (or ex-rv2av in _53+)
3043 }
3044 if (my $array_name=$self->elem_or_slice_array_name
3045 ($array, $left, $padname, 1)) {
3046 return "\$" . $array_name . $left . $idx . $right;
3047 } else {
3048 # $x[20][3]{hi} or expr->[20]
3049 my $arrow = is_subscriptable($array) ? "" : "->";
3050 return $self->deparse($array, 24) . $arrow . $left . $idx . $right;
3051 }
3052
6e90668e
SM
3053}
3054
3f872cb9
GS
3055sub pp_aelem { maybe_local(@_, elem(@_, "[", "]", "padav")) }
3056sub pp_helem { maybe_local(@_, elem(@_, "{", "}", "padhv")) }
6e90668e
SM
3057
3058sub pp_gelem {
3059 my $self = shift;
9d2c6865 3060 my($op, $cx) = @_;
6e90668e
SM
3061 my($glob, $part) = ($op->first, $op->last);
3062 $glob = $glob->first; # skip rv2gv
3f872cb9 3063 $glob = $glob->first if $glob->name eq "rv2gv"; # this one's a bug
9d2c6865
SM
3064 my $scope = is_scope($glob);
3065 $glob = $self->deparse($glob, 0);
3066 $part = $self->deparse($part, 1);
6e90668e
SM
3067 return "*" . ($scope ? "{$glob}" : $glob) . "{$part}";
3068}
3069
3070sub slice {
3071 my $self = shift;
9d2c6865 3072 my ($op, $cx, $left, $right, $regname, $padname) = @_;
6e90668e
SM
3073 my $last;
3074 my(@elems, $kid, $array, $list);
3075 if (class($op) eq "LISTOP") {
3076 $last = $op->last;
3077 } else { # ex-hslice inside delete()
3078 for ($kid = $op->first; !null $kid->sibling; $kid = $kid->sibling) {}
3079 $last = $kid;
3080 }
3081 $array = $last;
3082 $array = $array->first
3f872cb9 3083 if $array->name eq $regname or $array->name eq "null";
21b7468a 3084 $array = $self->elem_or_slice_array_name($array,$left,$padname,0);
6e90668e 3085 $kid = $op->first->sibling; # skip pushmark
3f872cb9 3086 if ($kid->name eq "list") {
6e90668e
SM
3087 $kid = $kid->first->sibling; # skip list, pushmark
3088 for (; !null $kid; $kid = $kid->sibling) {
9d2c6865 3089 push @elems, $self->deparse($kid, 6);
6e90668e
SM
3090 }
3091 $list = join(", ", @elems);
3092 } else {
21b7468a 3093 $list = $self->elem_or_slice_single_index($kid);
6e90668e
SM
3094 }
3095 return "\@" . $array . $left . $list . $right;
3096}
3097
3ed82cfc
GS
3098sub pp_aslice { maybe_local(@_, slice(@_, "[", "]", "rv2av", "padav")) }
3099sub pp_hslice { maybe_local(@_, slice(@_, "{", "}", "rv2hv", "padhv")) }
6e90668e
SM
3100
3101sub pp_lslice {
3102 my $self = shift;
9d2c6865 3103 my($op, $cx) = @_;
6e90668e
SM
3104 my $idx = $op->first;
3105 my $list = $op->last;
3106 my(@elems, $kid);
9d2c6865
SM
3107 $list = $self->deparse($list, 1);
3108 $idx = $self->deparse($idx, 1);
3109 return "($list)" . "[$idx]";
6e90668e
SM
3110}
3111
6e90668e
SM
3112sub want_scalar {
3113 my $op = shift;
3114 return ($op->flags & OPf_WANT) == OPf_WANT_SCALAR;
3115}
3116
bd0865ec
GS
3117sub want_list {
3118 my $op = shift;
3119 return ($op->flags & OPf_WANT) == OPf_WANT_LIST;
3120}
3121
09d856fb 3122sub _method {
6e90668e 3123 my $self = shift;
9d2c6865 3124 my($op, $cx) = @_;
bd0865ec
GS
3125 my $kid = $op->first->sibling; # skip pushmark
3126 my($meth, $obj, @exprs);
3f872cb9 3127 if ($kid->name eq "list" and want_list $kid) {
bd0865ec
GS
3128 # When an indirect object isn't a bareword but the args are in
3129 # parens, the parens aren't part of the method syntax (the LLAFR
3130 # doesn't apply), but they make a list with OPf_PARENS set that
3131 # doesn't get flattened by the append_elem that adds the method,
3132 # making a (object, arg1, arg2, ...) list where the object
d989cdac 3133 # usually is. This can be distinguished from
bd0865ec
GS
3134 # `($obj, $arg1, $arg2)->meth()' (which is legal if $arg2 is an
3135 # object) because in the later the list is in scalar context
3136 # as the left side of -> always is, while in the former
3137 # the list is in list context as method arguments always are.
3138 # (Good thing there aren't method prototypes!)
3ed82cfc 3139 $meth = $kid->sibling;
bd0865ec
GS
3140 $kid = $kid->first->sibling; # skip pushmark
3141 $obj = $kid;
6e90668e 3142 $kid = $kid->sibling;
bd0865ec 3143 for (; not null $kid; $kid = $kid->sibling) {
09d856fb 3144 push @exprs, $kid;
6e90668e 3145 }
bd0865ec
GS
3146 } else {
3147 $obj = $kid;
3148 $kid = $kid->sibling;
90c0eb26
RH
3149 for (; !null ($kid->sibling) && $kid->name ne "method_named";
3150 $kid = $kid->sibling) {
09d856fb 3151 push @exprs, $kid
6e90668e 3152 }
3ed82cfc 3153 $meth = $kid;
bd0865ec 3154 }
09d856fb 3155
3ed82cfc 3156 if ($meth->name eq "method_named") {
18228111 3157 $meth = $self->const_sv($meth)->PV;
bd0865ec 3158 } else {
3ed82cfc
GS
3159 $meth = $meth->first;
3160 if ($meth->name eq "const") {
3161 # As of 5.005_58, this case is probably obsoleted by the
3162 # method_named case above
18228111 3163 $meth = $self->const_sv($meth)->PV; # needs to be bare
3ed82cfc 3164 }
bd0865ec 3165 }
09d856fb
CK
3166
3167 return { method => $meth, variable_method => ref($meth),
3168 object => $obj, args => \@exprs };
3169}
3170
3171# compat function only
3172sub method {
3173 my $self = shift;
3174 my $info = $self->_method(@_);
3175 return $self->e_method( $self->_method(@_) );
3176}
3177
3178sub e_method {
3179 my ($self, $info) = @_;
3180 my $obj = $self->deparse($info->{object}, 24);
3181
3182 my $meth = $info->{method};
3183 $meth = $self->deparse($meth, 1) if $info->{variable_method};
3184 my $args = join(", ", map { $self->deparse($_, 6) } @{$info->{args}} );
3185 my $kid = $obj . "->" . $meth;
145eb477 3186 if (length $args) {
bd0865ec
GS
3187 return $kid . "(" . $args . ")"; # parens mandatory
3188 } else {
3189 return $kid;
3190 }
3191}
3192
3193# returns "&" if the prototype doesn't match the args,
3194# or ("", $args_after_prototype_demunging) if it does.
3195sub check_proto {
3196 my $self = shift;
acaaef34 3197 return "&" if $self->{'noproto'};
bd0865ec
GS
3198 my($proto, @args) = @_;
3199 my($arg, $real);
3200 my $doneok = 0;
3201 my @reals;
3202 # An unbackslashed @ or % gobbles up the rest of the args
2ae48fff 3203 1 while $proto =~ s/(?<!\\)([@%])[^\]]+$/$1/;
bd0865ec 3204 while ($proto) {
2ae48fff 3205 $proto =~ s/^(\\?[\$\@&%*]|\\\[[\$\@&%*]+\]|;)//;
bd0865ec
GS
3206 my $chr = $1;
3207 if ($chr eq "") {
3208 return "&" if @args;
3209 } elsif ($chr eq ";") {
3210 $doneok = 1;
3211 } elsif ($chr eq "@" or $chr eq "%") {
3212 push @reals, map($self->deparse($_, 6), @args);
3213 @args = ();
6e90668e 3214 } else {
bd0865ec
GS
3215 $arg = shift @args;
3216 last unless $arg;
3217 if ($chr eq "\$") {
3218 if (want_scalar $arg) {
3219 push @reals, $self->deparse($arg, 6);
3220 } else {
3221 return "&";
3222 }
3223 } elsif ($chr eq "&") {
3f872cb9 3224 if ($arg->name =~ /^(s?refgen|undef)$/) {
bd0865ec
GS
3225 push @reals, $self->deparse($arg, 6);
3226 } else {
3227 return "&";
3228 }
3229 } elsif ($chr eq "*") {
3f872cb9
GS
3230 if ($arg->name =~ /^s?refgen$/
3231 and $arg->first->first->name eq "rv2gv")
bd0865ec
GS
3232 {
3233 $real = $arg->first->first; # skip refgen, null
3f872cb9 3234 if ($real->first->name eq "gv") {
bd0865ec
GS
3235 push @reals, $self->deparse($real, 6);
3236 } else {
3237 push @reals, $self->deparse($real->first, 6);
3238 }
3239 } else {
3240 return "&";
3241 }
3242 } elsif (substr($chr, 0, 1) eq "\\") {
2ae48fff 3243 $chr =~ tr/\\[]//d;
3f872cb9 3244 if ($arg->name =~ /^s?refgen$/ and
bd0865ec 3245 !null($real = $arg->first) and
2ae48fff
RGS
3246 ($chr =~ /\$/ && is_scalar($real->first)
3247 or ($chr =~ /@/
3248 && class($real->first->sibling) ne 'NULL'
3f872cb9
GS
3249 && $real->first->sibling->name
3250 =~ /^(rv2|pad)av$/)
2ae48fff
RGS
3251 or ($chr =~ /%/
3252 && class($real->first->sibling) ne 'NULL'
3f872cb9
GS
3253 && $real->first->sibling->name
3254 =~ /^(rv2|pad)hv$/)
2ae48fff 3255 #or ($chr =~ /&/ # This doesn't work
3f872cb9 3256 # && $real->first->name eq "rv2cv")
2ae48fff 3257 or ($chr =~ /\*/
3f872cb9 3258 && $real->first->name eq "rv2gv")))
bd0865ec
GS
3259 {
3260 push @reals, $self->deparse($real, 6);
3261 } else {
3262 return "&";
3263 }
3264 }
3265 }
9d2c6865 3266 }
bd0865ec
GS
3267 return "&" if $proto and !$doneok; # too few args and no `;'
3268 return "&" if @args; # too many args
3269 return ("", join ", ", @reals);
3270}
3271
3272sub pp_entersub {
3273 my $self = shift;
3274 my($op, $cx) = @_;
09d856fb
CK
3275 return $self->e_method($self->_method($op, $cx))
3276 unless null $op->first->sibling;
bd0865ec
GS
3277 my $prefix = "";
3278 my $amper = "";
3279 my($kid, @exprs);
90c0eb26 3280 if ($op->flags & OPf_SPECIAL && !($op->flags & OPf_MOD)) {
9d2c6865
SM
3281 $prefix = "do ";
3282 } elsif ($op->private & OPpENTERSUB_AMPER) {
3283 $amper = "&";
3284 }
3285 $kid = $op->first;
3286 $kid = $kid->first->sibling; # skip ex-list, pushmark
3287 for (; not null $kid->sibling; $kid = $kid->sibling) {
3288 push @exprs, $kid;
3289 }
bd0865ec
GS
3290 my $simple = 0;
3291 my $proto = undef;
9d2c6865
SM
3292 if (is_scope($kid)) {
3293 $amper = "&";
3294 $kid = "{" . $self->deparse($kid, 0) . "}";
3f872cb9 3295 } elsif ($kid->first->name eq "gv") {
6f611a1a 3296 my $gv = $self->gv_or_padgv($kid->first);
9d2c6865
SM
3297 if (class($gv->CV) ne "SPECIAL") {
3298 $proto = $gv->CV->PV if $gv->CV->FLAGS & SVf_POK;
3299 }
bd0865ec 3300 $simple = 1; # only calls of named functions can be prototyped
9d2c6865 3301 $kid = $self->deparse($kid, 24);
8b2d6640
FC
3302 if (!$amper) {
3303 if ($kid eq 'main::') {
3304 $kid = '::';
3305 } elsif ($kid !~ /^(?:\w|::)(?:[\w\d]|::(?!\z))*\z/) {
3306 $kid = single_delim("q", "'", $kid) . '->';
3307 }
3308 }
90c0eb26 3309 } elsif (is_scalar ($kid->first) && $kid->first->name ne 'rv2cv') {
9d2c6865
SM
3310 $amper = "&";
3311 $kid = $self->deparse($kid, 24);
3312 } else {
3313 $prefix = "";
3ed82cfc
GS
3314 my $arrow = is_subscriptable($kid->first) ? "" : "->";
3315 $kid = $self->deparse($kid, 24) . $arrow;
9d2c6865 3316 }
0ca62a8e
RH
3317
3318 # Doesn't matter how many prototypes there are, if
3319 # they haven't happened yet!
1d38190f
RGS
3320 my $declared;
3321 {
3322 no strict 'refs';
3323 no warnings 'uninitialized';
3324 $declared = exists $self->{'subs_declared'}{$kid}
d989cdac 3325 || (
840378f5 3326 defined &{ ${$self->{'curstash'}."::"}{$kid} }
1d38190f
RGS
3327 && !exists
3328 $self->{'subs_deparsed'}{$self->{'curstash'}."::".$kid}
3329 && defined prototype $self->{'curstash'}."::".$kid
3330 );
3331 if (!$declared && defined($proto)) {
3332 # Avoid "too early to check prototype" warning
3333 ($amper, $proto) = ('&');
3334 }
e99ebc55 3335 }
0ca62a8e 3336
bd0865ec 3337 my $args;
0ca62a8e 3338 if ($declared and defined $proto and not $amper) {
bd0865ec
GS
3339 ($amper, $args) = $self->check_proto($proto, @exprs);
3340 if ($amper eq "&") {
9d2c6865
SM
3341 $args = join(", ", map($self->deparse($_, 6), @exprs));
3342 }
3343 } else {
3344 $args = join(", ", map($self->deparse($_, 6), @exprs));
6e90668e 3345 }
9d2c6865
SM
3346 if ($prefix or $amper) {
3347 if ($op->flags & OPf_STACKED) {
3348 return $prefix . $amper . $kid . "(" . $args . ")";
3349 } else {
3350 return $prefix . $amper. $kid;
3351 }
6e90668e 3352 } else {
34a48b4b 3353 # glob() invocations can be translated into calls of
d1be9408 3354 # CORE::GLOBAL::glob with a second parameter, a number.
34a48b4b
RH
3355 # Reverse this.
3356 if ($kid eq "CORE::GLOBAL::glob") {
3357 $kid = "glob";
3358 $args =~ s/\s*,[^,]+$//;
3359 }
3360
3361 # It's a syntax error to call CORE::GLOBAL::foo without a prefix,
3362 # so it must have been translated from a keyword call. Translate
3363 # it back.
3364 $kid =~ s/^CORE::GLOBAL:://;
3365
d989cdac 3366 my $dproto = defined($proto) ? $proto : "undefined";
0ca62a8e
RH
3367 if (!$declared) {
3368 return "$kid(" . $args . ")";
d989cdac 3369 } elsif ($dproto eq "") {
9d2c6865 3370 return $kid;
d989cdac
SM
3371 } elsif ($dproto eq "\$" and is_scalar($exprs[0])) {
3372 # is_scalar is an excessively conservative test here:
3373 # really, we should be comparing to the precedence of the
3374 # top operator of $exprs[0] (ala unop()), but that would
3375 # take some major code restructuring to do right.
9d2c6865 3376 return $self->maybe_parens_func($kid, $args, $cx, 16);
d989cdac 3377 } elsif ($dproto ne '$' and defined($proto) || $simple) { #'
9d2c6865
SM
3378 return $self->maybe_parens_func($kid, $args, $cx, 5);
3379 } else {
3380 return "$kid(" . $args . ")";
3381 }
6e90668e
SM
3382 }
3383}
3384
3385sub pp_enterwrite { unop(@_, "write") }
3386
3387# escape things that cause interpolation in double quotes,
3388# but not character escapes
3389sub uninterp {
3390 my($str) = @_;
3f766ba3 3391 $str =~ s/(^|\G|[^\\])((?:\\\\)*)([\$\@]|\\[uUlLQE])/$1$2\\$3/g;
9d2c6865
SM
3392 return $str;
3393}
3394
b7dad2dc
RH
3395{
3396my $bal;
3397BEGIN {
cdf8218f
RH
3398 use re "eval";
3399 # Matches any string which is balanced with respect to {braces}
b7dad2dc 3400 $bal = qr(
cdf8218f
RH
3401 (?:
3402 [^\\{}]
3403 | \\\\
3404 | \\[{}]
3405 | \{(??{$bal})\}
3406 )*
3407 )x;
b7dad2dc
RH
3408}
3409
3410# the same, but treat $|, $), $( and $ at the end of the string differently
3411sub re_uninterp {
3412 my($str) = @_;
cdf8218f
RH
3413
3414 $str =~ s/
3415 ( ^|\G # $1
3416 | [^\\]
3417 )
3418
3419 ( # $2
3420 (?:\\\\)*
3421 )
3422
3423 ( # $3
3424 (\(\?\??\{$bal\}\)) # $4
3425 | [\$\@]
3426 (?!\||\)|\(|$)
3427 | \\[uUlLQE]
3428 )
3429
2621462b 3430 /defined($4) && length($4) ? "$1$2$4" : "$1$2\\$3"/xeg;
cdf8218f 3431
6e90668e
SM
3432 return $str;
3433}
3434
b7dad2dc
RH
3435# This is for regular expressions with the /x modifier
3436# We have to leave comments unmangled.
a9760014 3437sub re_uninterp_extended {
b7dad2dc
RH
3438 my($str) = @_;
3439
3440 $str =~ s/
3441 ( ^|\G # $1
3442 | [^\\]
3443 )
3444
3445 ( # $2
3446 (?:\\\\)*
3447 )
3448
3449 ( # $3
3450 ( \(\?\??\{$bal\}\) # $4 (skip over (?{}) and (??{}) blocks)
3451 | \#[^\n]* # (skip over comments)
3452 )
3453 | [\$\@]
9a58b761 3454 (?!\||\)|\(|$|\s)
b7dad2dc
RH
3455 | \\[uUlLQE]
3456 )
3457
c7de4c66 3458 /defined($4) && length($4) ? "$1$2$4" : "$1$2\\$3"/xeg;
b7dad2dc 3459
a9760014
RH
3460 return $str;
3461}
b7dad2dc 3462}
a9760014 3463
57aa3c4e
JH
3464my %unctrl = # portable to to EBCDIC
3465 (
3466 "\c@" => '\c@', # unused
3467 "\cA" => '\cA',
3468 "\cB" => '\cB',
3469 "\cC" => '\cC',
3470 "\cD" => '\cD',
3471 "\cE" => '\cE',
3472 "\cF" => '\cF',
3473 "\cG" => '\cG',
3474 "\cH" => '\cH',
3475 "\cI" => '\cI',
3476 "\cJ" => '\cJ',
3477 "\cK" => '\cK',
3478 "\cL" => '\cL',
3479 "\cM" => '\cM',
3480 "\cN" => '\cN',
3481 "\cO" => '\cO',
3482 "\cP" => '\cP',
3483 "\cQ" => '\cQ',
3484 "\cR" => '\cR',
3485 "\cS" => '\cS',
3486 "\cT" => '\cT',
3487 "\cU" => '\cU',
3488 "\cV" => '\cV',
3489 "\cW" => '\cW',
3490 "\cX" => '\cX',
3491 "\cY" => '\cY',
3492 "\cZ" => '\cZ',
3493 "\c[" => '\c[', # unused
3494 "\c\\" => '\c\\', # unused
3495 "\c]" => '\c]', # unused
3496 "\c_" => '\c_', # unused
3497 );
3498
6e90668e 3499# character escapes, but not delimiters that might need to be escaped
746698c5 3500sub escape_str { # ASCII, UTF8
6e90668e 3501 my($str) = @_;
cef22867 3502 $str =~ s/(.)/ord($1) > 255 ? sprintf("\\x{%x}", ord($1)) : $1/eg;
6e90668e 3503 $str =~ s/\a/\\a/g;
d989cdac 3504# $str =~ s/\cH/\\b/g; # \b means something different in a regex
6e90668e
SM
3505 $str =~ s/\t/\\t/g;
3506 $str =~ s/\n/\\n/g;
3507 $str =~ s/\e/\\e/g;
3508 $str =~ s/\f/\\f/g;
3509 $str =~ s/\r/\\r/g;
fc132725 3510 $str =~ s/([\cA-\cZ])/$unctrl{$1}/ge;
cef22867 3511 $str =~ s/([[:^print:]])/sprintf("\\%03o", ord($1))/ge;
6e90668e
SM
3512 return $str;
3513}
3514
b7dad2dc
RH
3515# For regexes with the /x modifier.
3516# Leave whitespace unmangled.
a9760014
RH
3517sub escape_extended_re {
3518 my($str) = @_;
cef22867 3519 $str =~ s/(.)/ord($1) > 255 ? sprintf("\\x{%x}", ord($1)) : $1/eg;
aee8fd8d
RGS
3520 $str =~ s/([[:^print:]])/
3521 ($1 =~ y! \t\n!!) ? $1 : sprintf("\\%03o", ord($1))/ge;
a9760014
RH
3522 $str =~ s/\n/\n\f/g;
3523 return $str;
3524}
3525
9d2c6865
SM
3526# Don't do this for regexen
3527sub unback {
3528 my($str) = @_;
3529 $str =~ s/\\/\\\\/g;
3530 return $str;
3531}
3532
08c6f5ec
RH
3533# Remove backslashes which precede literal control characters,
3534# to avoid creating ambiguity when we escape the latter.
3535sub re_unback {
3536 my($str) = @_;
3537
3538 # the insane complexity here is due to the behaviour of "\c\"
cef22867 3539 $str =~ s/(^|[^\\]|\\c\\)(?<!\\c)\\(\\\\)*(?=[[:^print:]])/$1$2/g;
08c6f5ec
RH
3540 return $str;
3541}
3542
6e90668e
SM
3543sub balanced_delim {
3544 my($str) = @_;