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Re: Patch for Deep recursion in B::Deparse
[perl5.git] / ext / B / B / Deparse.pm
CommitLineData
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
06492da6 20 CVf_METHOD CVf_LOCKED CVf_LVALUE CVf_ASSERTION
fcd95d64 21 PMf_KEEP PMf_GLOBAL PMf_CONTINUE PMf_EVAL PMf_ONCE PMf_SKIPWHITE
bd0865ec 22 PMf_MULTILINE PMf_SINGLELINE PMf_FOLD PMf_EXTENDED);
b6b46d6f 23$VERSION = 0.81;
a798dbf2 24use strict;
2ae48fff 25use vars qw/$AUTOLOAD/;
34a48b4b 26use warnings ();
a798dbf2 27
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28# Changes between 0.50 and 0.51:
29# - fixed nulled leave with live enter in sort { }
30# - fixed reference constants (\"str")
31# - handle empty programs gracefully
32# - handle infinte loops (for (;;) {}, while (1) {})
33# - differentiate between `for my $x ...' and `my $x; for $x ...'
34# - various minor cleanups
35# - moved globals into an object
36# - added `-u', like B::C
37# - package declarations using cop_stash
38# - subs, formats and code sorted by cop_seq
f6f9bdb7 39# Changes between 0.51 and 0.52:
4d1ff10f 40# - added pp_threadsv (special variables under USE_5005THREADS)
f6f9bdb7 41# - added documentation
bd0865ec 42# Changes between 0.52 and 0.53:
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43# - many changes adding precedence contexts and associativity
44# - added `-p' and `-s' output style options
45# - various other minor fixes
bd0865ec 46# Changes between 0.53 and 0.54:
d7f5b6da
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47# - added support for new `for (1..100)' optimization,
48# thanks to Gisle Aas
bd0865ec 49# Changes between 0.54 and 0.55:
90be192f
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50# - added support for new qr// construct
51# - added support for new pp_regcreset OP
bd0865ec 52# Changes between 0.55 and 0.56:
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53# - tested on base/*.t, cmd/*.t, comp/*.t, io/*.t
54# - fixed $# on non-lexicals broken in last big rewrite
55# - added temporary fix for change in opcode of OP_STRINGIFY
56# - fixed problem in 0.54's for() patch in `for (@ary)'
57# - fixed precedence in conditional of ?:
58# - tweaked list paren elimination in `my($x) = @_'
59# - made continue-block detection trickier wrt. null ops
60# - fixed various prototype problems in pp_entersub
61# - added support for sub prototypes that never get GVs
62# - added unquoting for special filehandle first arg in truncate
63# - print doubled rv2gv (a bug) as `*{*GV}' instead of illegal `**GV'
64# - added semicolons at the ends of blocks
65# - added -l `#line' declaration option -- fixes cmd/subval.t 27,28
bd0865ec
GS
66# Changes between 0.56 and 0.561:
67# - fixed multiply-declared my var in pp_truncate (thanks to Sarathy)
68# - used new B.pm symbolic constants (done by Nick Ing-Simmons)
69# Changes between 0.561 and 0.57:
70# - stylistic changes to symbolic constant stuff
71# - handled scope in s///e replacement code
72# - added unquote option for expanding "" into concats, etc.
73# - split method and proto parts of pp_entersub into separate functions
74# - various minor cleanups
f4a44678
SM
75# Changes after 0.57:
76# - added parens in \&foo (patch by Albert Dvornik)
77# Changes between 0.57 and 0.58:
78# - fixed `0' statements that weren't being printed
79# - added methods for use from other programs
80# (based on patches from James Duncan and Hugo van der Sanden)
81# - added -si and -sT to control indenting (also based on a patch from Hugo)
82# - added -sv to print something else instead of '???'
83# - preliminary version of utf8 tr/// handling
3ed82cfc
GS
84# Changes after 0.58:
85# - uses of $op->ppaddr changed to new $op->name (done by Sarathy)
d989cdac 86# - added support for Hugo's new OP_SETSTATE (like nextstate)
3ed82cfc
GS
87# Changes between 0.58 and 0.59
88# - added support for Chip's OP_METHOD_NAMED
89# - added support for Ilya's OPpTARGET_MY optimization
90# - elided arrows before `()' subscripts when possible
58cccf98
SM
91# Changes between 0.59 and 0.60
92# - support for method attribues was added
93# - some warnings fixed
94# - separate recognition of constant subs
95# - rewrote continue block handling, now recoginizing for loops
96# - added more control of expanding control structures
c7f67cde
RH
97# Changes between 0.60 and 0.61 (mostly by Robin Houston)
98# - many bug-fixes
99# - support for pragmas and 'use'
100# - support for the little-used $[ variable
101# - support for __DATA__ sections
102# - UTF8 support
103# - BEGIN, CHECK, INIT and END blocks
104# - scoping of subroutine declarations fixed
105# - compile-time output from the input program can be suppressed, so that the
106# output is just the deparsed code. (a change to O.pm in fact)
107# - our() declarations
108# - *all* the known bugs are now listed in the BUGS section
109# - comprehensive test mechanism (TEST -deparse)
9a58b761
RGS
110# Changes between 0.62 and 0.63 (mostly by Rafael Garcia-Suarez)
111# - bug-fixes
112# - new switch -P
113# - support for command-line switches (-l, -0, etc.)
d989cdac
SM
114# Changes between 0.63 and 0.64
115# - support for //, CHECK blocks, and assertions
116# - improved handling of foreach loops and lexicals
117# - option to use Data::Dumper for constants
118# - more bug fixes
119# - discovered lots more bugs not yet fixed
0d863452
RH
120#
121# ...
122#
123# Changes between 0.72 and 0.73
124# - support new switch constructs
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125
126# Todo:
2a9e2f8a
RH
127# (See also BUGS section at the end of this file)
128#
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129# - finish tr/// changes
130# - add option for even more parens (generalize \&foo change)
90be192f 131# - left/right context
58cccf98 132# - copy comments (look at real text with $^P?)
f5aa8f4e 133# - avoid semis in one-statement blocks
9d2c6865 134# - associativity of &&=, ||=, ?:
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135# - ',' => '=>' (auto-unquote?)
136# - break long lines ("\r" as discretionary break?)
f4a44678
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137# - configurable syntax highlighting: ANSI color, HTML, TeX, etc.
138# - more style options: brace style, hex vs. octal, quotes, ...
139# - print big ints as hex/octal instead of decimal (heuristic?)
3ed82cfc 140# - handle `my $x if 0'?
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141# - version using op_next instead of op_first/sibling?
142# - avoid string copies (pass arrays, one big join?)
9d2c6865 143# - here-docs?
6e90668e 144
d989cdac
SM
145# Current test.deparse failures
146# comp/assertions 38 - disabled assertions should be like "my($x) if 0"
147# 'sub f : assertion {}; no assertions; my $x=1; {f(my $x=2); print "$x\n"}'
148# comp/hints 6 - location of BEGIN blocks wrt. block openings
149# run/switchI 1 - missing -I switches entirely
150# perl -Ifoo -e 'print @INC'
151# op/caller 2 - warning mask propagates backwards before warnings::register
152# 'use warnings; BEGIN {${^WARNING_BITS} eq "U"x12;} use warnings::register'
153# op/getpid 2 - can't assign to shared my() declaration (threads only)
154# 'my $x : shared = 5'
155# op/override 7 - parens on overriden require change v-string interpretation
156# 'BEGIN{*CORE::GLOBAL::require=sub {}} require v5.6'
157# c.f. 'BEGIN { *f = sub {0} }; f 2'
158# op/pat 774 - losing Unicode-ness of Latin1-only strings
159# 'use charnames ":short"; $x="\N{latin:a with acute}"'
160# op/recurse 12 - missing parens on recursive call makes it look like method
161# 'sub f { f($x) }'
162# op/subst 90 - inconsistent handling of utf8 under "use utf8"
163# op/taint 29 - "use re 'taint'" deparsed in the wrong place wrt. block open
164# op/tiehandle compile - "use strict" deparsed in the wrong place
165# uni/tr_ several
166# ext/B/t/xref 11 - line numbers when we add newlines to one-line subs
167# ext/Data/Dumper/t/dumper compile
168# ext/DB_file/several
169# ext/Encode/several
170# ext/Ernno/Errno warnings
171# ext/IO/lib/IO/t/io_sel 23
172# ext/PerlIO/t/encoding compile
173# ext/POSIX/t/posix 6
174# ext/Socket/Socket 8
175# ext/Storable/t/croak compile
176# lib/Attribute/Handlers/t/multi compile
177# lib/bignum/ several
178# lib/charnames 35
179# lib/constant 32
180# lib/English 40
181# lib/ExtUtils/t/bytes 4
182# lib/File/DosGlob compile
183# lib/Filter/Simple/t/data 1
184# lib/Math/BigInt/t/constant 1
185# lib/Net/t/config Deparse-warning
186# lib/overload compile
187# lib/Switch/ several
188# lib/Symbol 4
189# lib/Test/Simple several
190# lib/Term/Complete
191# lib/Tie/File/t/29_downcopy 5
192# lib/vars 22
f5aa8f4e 193
6e90668e
SM
194# Object fields (were globals):
195#
196# avoid_local:
197# (local($a), local($b)) and local($a, $b) have the same internal
198# representation but the short form looks better. We notice we can
199# use a large-scale local when checking the list, but need to prevent
d989cdac 200# individual locals too. This hash holds the addresses of OPs that
6e90668e
SM
201# have already had their local-ness accounted for. The same thing
202# is done with my().
203#
204# curcv:
205# CV for current sub (or main program) being deparsed
206#
8510e997
RH
207# curcvlex:
208# Cached hash of lexical variables for curcv: keys are names,
209# each value is an array of pairs, indicating the cop_seq of scopes
210# in which a var of that name is valid.
211#
34a48b4b
RH
212# curcop:
213# COP for statement being deparsed
214#
6e90668e
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215# curstash:
216# name of the current package for deparsed code
217#
218# subs_todo:
34a48b4b 219# array of [cop_seq, CV, is_format?] for subs and formats we still
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SM
220# want to deparse
221#
f5aa8f4e
SM
222# protos_todo:
223# as above, but [name, prototype] for subs that never got a GV
224#
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SM
225# subs_done, forms_done:
226# keys are addresses of GVs for subs and formats we've already
227# deparsed (or at least put into subs_todo)
9d2c6865 228#
0ca62a8e
RH
229# subs_declared
230# keys are names of subs for which we've printed declarations.
231# That means we can omit parentheses from the arguments.
232#
1d38190f
RGS
233# subs_deparsed
234# Keeps track of fully qualified names of all deparsed subs.
235#
9d2c6865 236# parens: -p
f5aa8f4e 237# linenums: -l
bd0865ec 238# unquote: -q
9d2c6865 239# cuddle: ` ' or `\n', depending on -sC
f4a44678
SM
240# indent_size: -si
241# use_tabs: -sT
242# ex_const: -sv
9d2c6865
SM
243
244# A little explanation of how precedence contexts and associativity
245# work:
246#
247# deparse() calls each per-op subroutine with an argument $cx (short
248# for context, but not the same as the cx* in the perl core), which is
249# a number describing the op's parents in terms of precedence, whether
f5aa8f4e 250# they're inside an expression or at statement level, etc. (see
9d2c6865
SM
251# chart below). When ops with children call deparse on them, they pass
252# along their precedence. Fractional values are used to implement
253# associativity (`($x + $y) + $z' => `$x + $y + $y') and related
254# parentheses hacks. The major disadvantage of this scheme is that
255# it doesn't know about right sides and left sides, so say if you
256# assign a listop to a variable, it can't tell it's allowed to leave
257# the parens off the listop.
258
259# Precedences:
260# 26 [TODO] inside interpolation context ("")
261# 25 left terms and list operators (leftward)
262# 24 left ->
263# 23 nonassoc ++ --
264# 22 right **
265# 21 right ! ~ \ and unary + and -
266# 20 left =~ !~
267# 19 left * / % x
268# 18 left + - .
269# 17 left << >>
270# 16 nonassoc named unary operators
271# 15 nonassoc < > <= >= lt gt le ge
272# 14 nonassoc == != <=> eq ne cmp
273# 13 left &
274# 12 left | ^
275# 11 left &&
276# 10 left ||
277# 9 nonassoc .. ...
278# 8 right ?:
279# 7 right = += -= *= etc.
280# 6 left , =>
281# 5 nonassoc list operators (rightward)
282# 4 right not
283# 3 left and
284# 2 left or xor
285# 1 statement modifiers
d989cdac 286# 0.5 statements, but still print scopes as do { ... }
9d2c6865
SM
287# 0 statement level
288
289# Nonprinting characters with special meaning:
290# \cS - steal parens (see maybe_parens_unop)
291# \n - newline and indent
292# \t - increase indent
293# \b - decrease indent (`outdent')
f5aa8f4e 294# \f - flush left (no indent)
9d2c6865 295# \cK - kill following semicolon, if any
6e90668e
SM
296
297sub null {
298 my $op = shift;
299 return class($op) eq "NULL";
300}
301
302sub todo {
303 my $self = shift;
34a48b4b 304 my($cv, $is_form) = @_;
e31885a0 305 return unless ($cv->FILE eq $0 || exists $self->{files}{$cv->FILE});
6e90668e 306 my $seq;
d989cdac
SM
307 if ($cv->OUTSIDE_SEQ) {
308 $seq = $cv->OUTSIDE_SEQ;
309 } elsif (!null($cv->START) and is_state($cv->START)) {
6e90668e
SM
310 $seq = $cv->START->cop_seq;
311 } else {
312 $seq = 0;
313 }
34a48b4b 314 push @{$self->{'subs_todo'}}, [$seq, $cv, $is_form];
1d38190f
RGS
315 unless ($is_form || class($cv->STASH) eq 'SPECIAL') {
316 $self->{'subs_deparsed'}{$cv->STASH->NAME."::".$cv->GV->NAME} = 1;
317 }
6e90668e
SM
318}
319
320sub next_todo {
321 my $self = shift;
322 my $ent = shift @{$self->{'subs_todo'}};
34a48b4b
RH
323 my $cv = $ent->[1];
324 my $gv = $cv->GV;
325 my $name = $self->gv_name($gv);
6e90668e
SM
326 if ($ent->[2]) {
327 return "format $name =\n"
e31885a0 328 . $self->deparse_format($ent->[1]). "\n";
6e90668e 329 } else {
0ca62a8e 330 $self->{'subs_declared'}{$name} = 1;
34a48b4b
RH
331 if ($name eq "BEGIN") {
332 my $use_dec = $self->begin_is_use($cv);
d989cdac 333 if (defined ($use_dec) and $self->{'expand'} < 5) {
0e7fe0f0
RH
334 return () if 0 == length($use_dec);
335 return $use_dec;
336 }
34a48b4b 337 }
a0035eb8
RH
338 my $l = '';
339 if ($self->{'linenums'}) {
340 my $line = $gv->LINE;
341 my $file = $gv->FILE;
342 $l = "\n\f#line $line \"$file\"\n";
343 }
127212b2
DM
344 my $p = '';
345 if (class($cv->STASH) ne "SPECIAL") {
346 my $stash = $cv->STASH->NAME;
347 if ($stash ne $self->{'curstash'}) {
348 $p = "package $stash;\n";
349 $name = "$self->{'curstash'}::$name" unless $name =~ /::/;
350 $self->{'curstash'} = $stash;
351 }
352 $name =~ s/^\Q$stash\E:://;
353 }
354 return "${p}${l}sub $name " . $self->deparse_sub($cv);
34a48b4b
RH
355 }
356}
357
358# Return a "use" declaration for this BEGIN block, if appropriate
359sub begin_is_use {
360 my ($self, $cv) = @_;
361 my $root = $cv->ROOT;
80dc0729 362 local @$self{qw'curcv curcvlex'} = ($cv);
34a48b4b
RH
363#require B::Debug;
364#B::walkoptree($cv->ROOT, "debug");
365 my $lineseq = $root->first;
366 return if $lineseq->name ne "lineseq";
367
368 my $req_op = $lineseq->first->sibling;
369 return if $req_op->name ne "require";
370
371 my $module;
372 if ($req_op->first->private & OPpCONST_BARE) {
373 # Actually it should always be a bareword
374 $module = $self->const_sv($req_op->first)->PV;
375 $module =~ s[/][::]g;
376 $module =~ s/.pm$//;
377 }
378 else {
d989cdac 379 $module = $self->const($self->const_sv($req_op->first), 6);
34a48b4b
RH
380 }
381
382 my $version;
383 my $version_op = $req_op->sibling;
384 return if class($version_op) eq "NULL";
385 if ($version_op->name eq "lineseq") {
386 # We have a version parameter; skip nextstate & pushmark
387 my $constop = $version_op->first->next->next;
388
389 return unless $self->const_sv($constop)->PV eq $module;
390 $constop = $constop->sibling;
a58644de 391 $version = $self->const_sv($constop);
d989cdac
SM
392 if (class($version) eq "IV") {
393 $version = $version->int_value;
394 } elsif (class($version) eq "NV") {
395 $version = $version->NV;
396 } elsif (class($version) ne "PVMG") {
397 # Includes PVIV and PVNV
a58644de
RGS
398 $version = $version->PV;
399 } else {
400 # version specified as a v-string
401 $version = 'v'.join '.', map ord, split //, $version->PV;
402 }
34a48b4b
RH
403 $constop = $constop->sibling;
404 return if $constop->name ne "method_named";
405 return if $self->const_sv($constop)->PV ne "VERSION";
406 }
407
408 $lineseq = $version_op->sibling;
409 return if $lineseq->name ne "lineseq";
410 my $entersub = $lineseq->first->sibling;
411 if ($entersub->name eq "stub") {
412 return "use $module $version ();\n" if defined $version;
413 return "use $module ();\n";
414 }
415 return if $entersub->name ne "entersub";
416
417 # See if there are import arguments
418 my $args = '';
419
6ec152c3
RH
420 my $svop = $entersub->first->sibling; # Skip over pushmark
421 return unless $self->const_sv($svop)->PV eq $module;
34a48b4b
RH
422
423 # Pull out the arguments
6ec152c3
RH
424 for ($svop=$svop->sibling; $svop->name ne "method_named";
425 $svop = $svop->sibling) {
34a48b4b 426 $args .= ", " if length($args);
6ec152c3 427 $args .= $self->deparse($svop, 6);
34a48b4b
RH
428 }
429
430 my $use = 'use';
6ec152c3 431 my $method_named = $svop;
34a48b4b
RH
432 return if $method_named->name ne "method_named";
433 my $method_name = $self->const_sv($method_named)->PV;
434
435 if ($method_name eq "unimport") {
436 $use = 'no';
437 }
438
439 # Certain pragmas are dealt with using hint bits,
440 # so we ignore them here
441 if ($module eq 'strict' || $module eq 'integer'
0e7fe0f0 442 || $module eq 'bytes' || $module eq 'warnings') {
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) {
471 next if $key eq 'main::'; # avoid infinite recursion
f5aa8f4e
SM
472 my $class = class($val);
473 if ($class eq "PV") {
a0035eb8
RH
474 # Just a prototype. As an ugly but fairly effective way
475 # to find out if it belongs here is to see if the AUTOLOAD
476 # (if any) for the stash was defined in one of our files.
477 my $A = $stash{"AUTOLOAD"};
478 if (defined ($A) && class($A) eq "GV" && defined($A->CV)
479 && class($A->CV) eq "CV") {
480 my $AF = $A->FILE;
481 next unless $AF eq $0 || exists $self->{'files'}{$AF};
482 }
f5aa8f4e
SM
483 push @{$self->{'protos_todo'}}, [$pack . $key, $val->PV];
484 } elsif ($class eq "IV") {
a0035eb8
RH
485 # Just a name. As above.
486 my $A = $stash{"AUTOLOAD"};
487 if (defined ($A) && class($A) eq "GV" && defined($A->CV)
488 && class($A->CV) eq "CV") {
489 my $AF = $A->FILE;
490 next unless $AF eq $0 || exists $self->{'files'}{$AF};
491 }
d989cdac 492 push @{$self->{'protos_todo'}}, [$pack . $key, undef];
f5aa8f4e 493 } elsif ($class eq "GV") {
34a48b4b 494 if (class(my $cv = $val->CV) ne "SPECIAL") {
f5aa8f4e 495 next if $self->{'subs_done'}{$$val}++;
e31885a0 496 next if $$val != ${$cv->GV}; # Ignore imposters
8510e997 497 $self->todo($cv, 0);
f5aa8f4e 498 }
e31885a0 499 if (class(my $cv = $val->FORM) ne "SPECIAL") {
f5aa8f4e 500 next if $self->{'forms_done'}{$$val}++;
e31885a0
RH
501 next if $$val != ${$cv->GV}; # Ignore imposters
502 $self->todo($cv, 1);
f5aa8f4e 503 }
34a48b4b
RH
504 if (class($val->HV) ne "SPECIAL" && $key =~ /::$/) {
505 $self->stash_subs($pack . $key);
506 }
6e90668e
SM
507 }
508 }
509}
a798dbf2 510
f5aa8f4e
SM
511sub print_protos {
512 my $self = shift;
513 my $ar;
514 my @ret;
515 foreach $ar (@{$self->{'protos_todo'}}) {
516 my $proto = (defined $ar->[1] ? " (". $ar->[1] . ")" : "");
517 push @ret, "sub " . $ar->[0] . "$proto;\n";
518 }
519 delete $self->{'protos_todo'};
520 return @ret;
521}
522
9d2c6865
SM
523sub style_opts {
524 my $self = shift;
525 my $opts = shift;
526 my $opt;
527 while (length($opt = substr($opts, 0, 1))) {
528 if ($opt eq "C") {
529 $self->{'cuddle'} = " ";
f4a44678
SM
530 $opts = substr($opts, 1);
531 } elsif ($opt eq "i") {
532 $opts =~ s/^i(\d+)//;
533 $self->{'indent_size'} = $1;
534 } elsif ($opt eq "T") {
535 $self->{'use_tabs'} = 1;
536 $opts = substr($opts, 1);
537 } elsif ($opt eq "v") {
538 $opts =~ s/^v([^.]*)(.|$)//;
539 $self->{'ex_const'} = $1;
9d2c6865 540 }
9d2c6865
SM
541 }
542}
543
f4a44678
SM
544sub new {
545 my $class = shift;
546 my $self = bless {}, $class;
f4a44678 547 $self->{'cuddle'} = "\n";
d989cdac
SM
548 $self->{'curcop'} = undef;
549 $self->{'curstash'} = "main";
550 $self->{'ex_const'} = "'???'";
793e2a70 551 $self->{'expand'} = 0;
d989cdac
SM
552 $self->{'files'} = {};
553 $self->{'indent_size'} = 4;
793e2a70
RH
554 $self->{'linenums'} = 0;
555 $self->{'parens'} = 0;
d989cdac
SM
556 $self->{'subs_todo'} = [];
557 $self->{'unquote'} = 0;
558 $self->{'use_dumper'} = 0;
559 $self->{'use_tabs'} = 0;
08c6f5ec
RH
560
561 $self->{'ambient_arybase'} = 0;
e31885a0 562 $self->{'ambient_warnings'} = undef; # Assume no lexical warnings
a0405c92 563 $self->{'ambient_hints'} = 0;
08c6f5ec
RH
564 $self->init();
565
f4a44678 566 while (my $arg = shift @_) {
d989cdac
SM
567 if ($arg eq "-d") {
568 $self->{'use_dumper'} = 1;
569 require Data::Dumper;
570 } elsif ($arg =~ /^-f(.*)/) {
34a48b4b 571 $self->{'files'}{$1} = 1;
d989cdac
SM
572 } elsif ($arg eq "-l") {
573 $self->{'linenums'} = 1;
f4a44678
SM
574 } elsif ($arg eq "-p") {
575 $self->{'parens'} = 1;
acaaef34
RGS
576 } elsif ($arg eq "-P") {
577 $self->{'noproto'} = 1;
f4a44678
SM
578 } elsif ($arg eq "-q") {
579 $self->{'unquote'} = 1;
580 } elsif (substr($arg, 0, 2) eq "-s") {
581 $self->style_opts(substr $arg, 2);
58cccf98
SM
582 } elsif ($arg =~ /^-x(\d)$/) {
583 $self->{'expand'} = $1;
f4a44678
SM
584 }
585 }
586 return $self;
587}
588
810aef70
RH
589{
590 # Mask out the bits that L<warnings::register> uses
591 my $WARN_MASK;
592 BEGIN {
593 $WARN_MASK = $warnings::Bits{all} | $warnings::DeadBits{all};
594 }
595 sub WARN_MASK () {
596 return $WARN_MASK;
597 }
34a48b4b
RH
598}
599
08c6f5ec
RH
600# Initialise the contextual information, either from
601# defaults provided with the ambient_pragmas method,
602# or from perl's own defaults otherwise.
603sub init {
604 my $self = shift;
605
606 $self->{'arybase'} = $self->{'ambient_arybase'};
e31885a0
RH
607 $self->{'warnings'} = defined ($self->{'ambient_warnings'})
608 ? $self->{'ambient_warnings'} & WARN_MASK
609 : undef;
d5ec2987 610 $self->{'hints'} = $self->{'ambient_hints'};
217aba5d
RH
611
612 # also a convenient place to clear out subs_declared
613 delete $self->{'subs_declared'};
08c6f5ec
RH
614}
615
a798dbf2 616sub compile {
6e90668e 617 my(@args) = @_;
d989cdac 618 return sub {
f4a44678 619 my $self = B::Deparse->new(@args);
d2bc402e
RGS
620 # First deparse command-line args
621 if (defined $^I) { # deparse -i
51a5edaf 622 print q(BEGIN { $^I = ).perlstring($^I).qq(; }\n);
d2bc402e
RGS
623 }
624 if ($^W) { # deparse -w
625 print qq(BEGIN { \$^W = $^W; }\n);
626 }
627 if ($/ ne "\n" or defined $O::savebackslash) { # deparse -l and -0
51a5edaf
RGS
628 my $fs = perlstring($/) || 'undef';
629 my $bs = perlstring($O::savebackslash) || 'undef';
d2bc402e
RGS
630 print qq(BEGIN { \$/ = $fs; \$\\ = $bs; }\n);
631 }
34a48b4b 632 my @BEGINs = B::begin_av->isa("B::AV") ? B::begin_av->ARRAY : ();
676456c2
AG
633 my @UNITCHECKs = B::unitcheck_av->isa("B::AV")
634 ? B::unitcheck_av->ARRAY
635 : ();
ece599bd 636 my @CHECKs = B::check_av->isa("B::AV") ? B::check_av->ARRAY : ();
34a48b4b
RH
637 my @INITs = B::init_av->isa("B::AV") ? B::init_av->ARRAY : ();
638 my @ENDs = B::end_av->isa("B::AV") ? B::end_av->ARRAY : ();
676456c2 639 for my $block (@BEGINs, @UNITCHECKs, @CHECKs, @INITs, @ENDs) {
e31885a0 640 $self->todo($block, 0);
34a48b4b
RH
641 }
642 $self->stash_subs();
d989cdac
SM
643 local($SIG{"__DIE__"}) =
644 sub {
645 if ($self->{'curcop'}) {
646 my $cop = $self->{'curcop'};
647 my($line, $file) = ($cop->line, $cop->file);
648 print STDERR "While deparsing $file near line $line,\n";
649 }
650 };
6e90668e 651 $self->{'curcv'} = main_cv;
8510e997 652 $self->{'curcvlex'} = undef;
f5aa8f4e 653 print $self->print_protos;
6e90668e 654 @{$self->{'subs_todo'}} =
f4a44678 655 sort {$a->[0] <=> $b->[0]} @{$self->{'subs_todo'}};
d989cdac 656 print $self->indent($self->deparse_root(main_root)), "\n"
f4a44678 657 unless null main_root;
6e90668e
SM
658 my @text;
659 while (scalar(@{$self->{'subs_todo'}})) {
660 push @text, $self->next_todo;
661 }
6f611a1a 662 print $self->indent(join("", @text)), "\n" if @text;
e31885a0
RH
663
664 # Print __DATA__ section, if necessary
665 no strict 'refs';
96c57f7e
RGS
666 my $laststash = defined $self->{'curcop'}
667 ? $self->{'curcop'}->stash->NAME : $self->{'curstash'};
668 if (defined *{$laststash."::DATA"}{IO}) {
127212b2
DM
669 print "package $laststash;\n"
670 unless $laststash eq $self->{'curstash'};
e31885a0 671 print "__DATA__\n";
96c57f7e 672 print readline(*{$laststash."::DATA"});
e31885a0 673 }
a798dbf2 674 }
a798dbf2
MB
675}
676
f4a44678
SM
677sub coderef2text {
678 my $self = shift;
679 my $sub = shift;
0853f172 680 croak "Usage: ->coderef2text(CODEREF)" unless UNIVERSAL::isa($sub, "CODE");
08c6f5ec
RH
681
682 $self->init();
f4a44678
SM
683 return $self->indent($self->deparse_sub(svref_2object($sub)));
684}
685
08c6f5ec
RH
686sub ambient_pragmas {
687 my $self = shift;
e31885a0 688 my ($arybase, $hint_bits, $warning_bits) = (0, 0);
08c6f5ec
RH
689
690 while (@_ > 1) {
691 my $name = shift();
692 my $val = shift();
693
694 if ($name eq 'strict') {
695 require strict;
696
697 if ($val eq 'none') {
698 $hint_bits &= ~strict::bits(qw/refs subs vars/);
699 next();
700 }
701
702 my @names;
703 if ($val eq "all") {
704 @names = qw/refs subs vars/;
705 }
706 elsif (ref $val) {
707 @names = @$val;
708 }
709 else {
a0405c92 710 @names = split' ', $val;
08c6f5ec
RH
711 }
712 $hint_bits |= strict::bits(@names);
713 }
714
715 elsif ($name eq '$[') {
716 $arybase = $val;
717 }
718
a0405c92
RH
719 elsif ($name eq 'integer'
720 || $name eq 'bytes'
721 || $name eq 'utf8') {
722 require "$name.pm";
08c6f5ec 723 if ($val) {
a0405c92
RH
724 $hint_bits |= ${$::{"${name}::"}{"hint_bits"}};
725 }
726 else {
727 $hint_bits &= ~${$::{"${name}::"}{"hint_bits"}};
728 }
729 }
730
731 elsif ($name eq 're') {
732 require re;
733 if ($val eq 'none') {
2570cdf1 734 $hint_bits &= ~re::bits(qw/taint eval/);
a0405c92
RH
735 next();
736 }
737
738 my @names;
739 if ($val eq 'all') {
2570cdf1 740 @names = qw/taint eval/;
a0405c92
RH
741 }
742 elsif (ref $val) {
743 @names = @$val;
08c6f5ec
RH
744 }
745 else {
a0405c92 746 @names = split' ',$val;
08c6f5ec 747 }
a0405c92 748 $hint_bits |= re::bits(@names);
08c6f5ec
RH
749 }
750
751 elsif ($name eq 'warnings') {
08c6f5ec 752 if ($val eq 'none') {
810aef70 753 $warning_bits = $warnings::NONE;
08c6f5ec
RH
754 next();
755 }
756
757 my @names;
758 if (ref $val) {
759 @names = @$val;
760 }
761 else {
762 @names = split/\s+/, $val;
763 }
764
810aef70 765 $warning_bits = $warnings::NONE if !defined ($warning_bits);
08c6f5ec
RH
766 $warning_bits |= warnings::bits(@names);
767 }
768
769 elsif ($name eq 'warning_bits') {
770 $warning_bits = $val;
771 }
772
773 elsif ($name eq 'hint_bits') {
774 $hint_bits = $val;
775 }
776
777 else {
778 croak "Unknown pragma type: $name";
779 }
780 }
781 if (@_) {
782 croak "The ambient_pragmas method expects an even number of args";
783 }
784
785 $self->{'ambient_arybase'} = $arybase;
786 $self->{'ambient_warnings'} = $warning_bits;
a0405c92 787 $self->{'ambient_hints'} = $hint_bits;
08c6f5ec
RH
788}
789
d989cdac 790# This method is the inner loop, so try to keep it simple
6e90668e
SM
791sub deparse {
792 my $self = shift;
d989cdac 793 my($op, $cx) = @_;
34a48b4b
RH
794
795 Carp::confess("Null op in deparse") if !defined($op)
796 || class($op) eq "NULL";
3f872cb9 797 my $meth = "pp_" . $op->name;
9d2c6865 798 return $self->$meth($op, $cx);
a798dbf2
MB
799}
800
6e90668e 801sub indent {
f4a44678 802 my $self = shift;
6e90668e
SM
803 my $txt = shift;
804 my @lines = split(/\n/, $txt);
805 my $leader = "";
f4a44678 806 my $level = 0;
6e90668e
SM
807 my $line;
808 for $line (@lines) {
f4a44678
SM
809 my $cmd = substr($line, 0, 1);
810 if ($cmd eq "\t" or $cmd eq "\b") {
811 $level += ($cmd eq "\t" ? 1 : -1) * $self->{'indent_size'};
812 if ($self->{'use_tabs'}) {
813 $leader = "\t" x ($level / 8) . " " x ($level % 8);
814 } else {
815 $leader = " " x $level;
816 }
6e90668e
SM
817 $line = substr($line, 1);
818 }
f5aa8f4e
SM
819 if (substr($line, 0, 1) eq "\f") {
820 $line = substr($line, 1); # no indent
821 } else {
822 $line = $leader . $line;
823 }
9d2c6865 824 $line =~ s/\cK;?//g;
6e90668e
SM
825 }
826 return join("\n", @lines);
827}
828
6e90668e
SM
829sub deparse_sub {
830 my $self = shift;
831 my $cv = shift;
832 my $proto = "";
ce4e655d 833Carp::confess("NULL in deparse_sub") if !defined($cv) || $cv->isa("B::NULL");
34a48b4b
RH
834Carp::confess("SPECIAL in deparse_sub") if $cv->isa("B::SPECIAL");
835 local $self->{'curcop'} = $self->{'curcop'};
6e90668e
SM
836 if ($cv->FLAGS & SVf_POK) {
837 $proto = "(". $cv->PV . ") ";
838 }
06492da6 839 if ($cv->CvFLAGS & (CVf_METHOD|CVf_LOCKED|CVf_LVALUE|CVf_ASSERTION)) {
6aaf4108
SC
840 $proto .= ": ";
841 $proto .= "lvalue " if $cv->CvFLAGS & CVf_LVALUE;
842 $proto .= "locked " if $cv->CvFLAGS & CVf_LOCKED;
843 $proto .= "method " if $cv->CvFLAGS & CVf_METHOD;
06492da6 844 $proto .= "assertion " if $cv->CvFLAGS & CVf_ASSERTION;
6aaf4108
SC
845 }
846
6e90668e 847 local($self->{'curcv'}) = $cv;
8510e997 848 local($self->{'curcvlex'});
a0405c92
RH
849 local(@$self{qw'curstash warnings hints'})
850 = @$self{qw'curstash warnings hints'};
ce4e655d 851 my $body;
6e90668e 852 if (not null $cv->ROOT) {
ce4e655d
RH
853 my $lineseq = $cv->ROOT->first;
854 if ($lineseq->name eq "lineseq") {
855 my @ops;
856 for(my$o=$lineseq->first; $$o; $o=$o->sibling) {
857 push @ops, $o;
858 }
859 $body = $self->lineseq(undef, @ops).";";
860 my $scope_en = $self->find_scope_en($lineseq);
861 if (defined $scope_en) {
862 my $subs = join"", $self->seq_subs($scope_en);
863 $body .= ";\n$subs" if length($subs);
864 }
865 }
866 else {
867 $body = $self->deparse($cv->ROOT->first, 0);
868 }
de3f1649 869 }
ce4e655d
RH
870 else {
871 my $sv = $cv->const_sv;
872 if ($$sv) {
873 # uh-oh. inlinable sub... format it differently
d989cdac 874 return $proto . "{ " . $self->const($sv, 0) . " }\n";
ce4e655d
RH
875 } else { # XSUB? (or just a declaration)
876 return "$proto;\n";
877 }
6e90668e 878 }
ce4e655d 879 return $proto ."{\n\t$body\n\b}" ."\n";
6e90668e
SM
880}
881
882sub deparse_format {
883 my $self = shift;
884 my $form = shift;
885 my @text;
886 local($self->{'curcv'}) = $form;
8510e997 887 local($self->{'curcvlex'});
67fc2416 888 local($self->{'in_format'}) = 1;
a0405c92 889 local(@$self{qw'curstash warnings hints'})
67fc2416 890 = @$self{qw'curstash warnings hints'};
6e90668e
SM
891 my $op = $form->ROOT;
892 my $kid;
fb725297
RGS
893 return "\f." if $op->first->name eq 'stub'
894 || $op->first->name eq 'nextstate';
6e90668e
SM
895 $op = $op->first->first; # skip leavewrite, lineseq
896 while (not null $op) {
897 $op = $op->sibling; # skip nextstate
898 my @exprs;
899 $kid = $op->first->sibling; # skip pushmark
a5b0cd91 900 push @text, "\f".$self->const_sv($kid)->PV;
6e90668e
SM
901 $kid = $kid->sibling;
902 for (; not null $kid; $kid = $kid->sibling) {
9d2c6865 903 push @exprs, $self->deparse($kid, 0);
6e90668e 904 }
a5b0cd91 905 push @text, "\f".join(", ", @exprs)."\n" if @exprs;
6e90668e
SM
906 $op = $op->sibling;
907 }
a5b0cd91 908 return join("", @text) . "\f.";
6e90668e
SM
909}
910
6e90668e 911sub is_scope {
a798dbf2 912 my $op = shift;
3f872cb9
GS
913 return $op->name eq "leave" || $op->name eq "scope"
914 || $op->name eq "lineseq"
d989cdac 915 || ($op->name eq "null" && class($op) eq "UNOP"
3f872cb9 916 && (is_scope($op->first) || $op->first->name eq "enter"));
6e90668e
SM
917}
918
919sub is_state {
3f872cb9
GS
920 my $name = $_[0]->name;
921 return $name eq "nextstate" || $name eq "dbstate" || $name eq "setstate";
6e90668e
SM
922}
923
924sub is_miniwhile { # check for one-line loop (`foo() while $y--')
925 my $op = shift;
d989cdac 926 return (!null($op) and null($op->sibling)
3f872cb9
GS
927 and $op->name eq "null" and class($op) eq "UNOP"
928 and (($op->first->name =~ /^(and|or)$/
929 and $op->first->first->sibling->name eq "lineseq")
930 or ($op->first->name eq "lineseq"
6e90668e 931 and not null $op->first->first->sibling
3f872cb9 932 and $op->first->first->sibling->name eq "unstack")
6e90668e
SM
933 ));
934}
935
d989cdac
SM
936# Check if the op and its sibling are the initialization and the rest of a
937# for (..;..;..) { ... } loop
938sub is_for_loop {
939 my $op = shift;
940 # This OP might be almost anything, though it won't be a
941 # nextstate. (It's the initialization, so in the canonical case it
942 # will be an sassign.) The sibling is a lineseq whose first child
943 # is a nextstate and whose second is a leaveloop.
944 my $lseq = $op->sibling;
945 if (!is_state $op and !null($lseq) and $lseq->name eq "lineseq") {
946 if ($lseq->first && !null($lseq->first) && is_state($lseq->first)
947 && (my $sib = $lseq->first->sibling)) {
948 return (!null($sib) && $sib->name eq "leaveloop");
949 }
950 }
951 return 0;
952}
953
6e90668e
SM
954sub is_scalar {
955 my $op = shift;
3f872cb9
GS
956 return ($op->name eq "rv2sv" or
957 $op->name eq "padsv" or
958 $op->name eq "gv" or # only in array/hash constructs
bd0865ec 959 $op->flags & OPf_KIDS && !null($op->first)
3f872cb9 960 && $op->first->name eq "gvsv");
6e90668e
SM
961}
962
9d2c6865
SM
963sub maybe_parens {
964 my $self = shift;
965 my($text, $cx, $prec) = @_;
966 if ($prec < $cx # unary ops nest just fine
967 or $prec == $cx and $cx != 4 and $cx != 16 and $cx != 21
968 or $self->{'parens'})
969 {
970 $text = "($text)";
971 # In a unop, let parent reuse our parens; see maybe_parens_unop
972 $text = "\cS" . $text if $cx == 16;
973 return $text;
974 } else {
975 return $text;
976 }
977}
978
979# same as above, but get around the `if it looks like a function' rule
980sub maybe_parens_unop {
981 my $self = shift;
982 my($name, $kid, $cx) = @_;
983 if ($cx > 16 or $self->{'parens'}) {
a0035eb8
RH
984 $kid = $self->deparse($kid, 1);
985 if ($name eq "umask" && $kid =~ /^\d+$/) {
986 $kid = sprintf("%#o", $kid);
987 }
988 return "$name($kid)";
9d2c6865
SM
989 } else {
990 $kid = $self->deparse($kid, 16);
a0035eb8
RH
991 if ($name eq "umask" && $kid =~ /^\d+$/) {
992 $kid = sprintf("%#o", $kid);
993 }
9d2c6865
SM
994 if (substr($kid, 0, 1) eq "\cS") {
995 # use kid's parens
996 return $name . substr($kid, 1);
997 } elsif (substr($kid, 0, 1) eq "(") {
998 # avoid looks-like-a-function trap with extra parens
999 # (`+' can lead to ambiguities)
1000 return "$name(" . $kid . ")";
1001 } else {
1002 return "$name $kid";
1003 }
1004 }
1005}
1006
1007sub maybe_parens_func {
1008 my $self = shift;
1009 my($func, $text, $cx, $prec) = @_;
1010 if ($prec <= $cx or substr($text, 0, 1) eq "(" or $self->{'parens'}) {
1011 return "$func($text)";
1012 } else {
1013 return "$func $text";
1014 }
1015}
1016
6e90668e
SM
1017sub maybe_local {
1018 my $self = shift;
9d2c6865 1019 my($op, $cx, $text) = @_;
ce4e655d
RH
1020 my $our_intro = ($op->name =~ /^(gv|rv2)[ash]v$/) ? OPpOUR_INTRO : 0;
1021 if ($op->private & (OPpLVAL_INTRO|$our_intro)
1022 and not $self->{'avoid_local'}{$$op}) {
1023 my $our_local = ($op->private & OPpLVAL_INTRO) ? "local" : "our";
8e3542b6 1024 if( $our_local eq 'our' ) {
cf24a840
SM
1025 # XXX This assertion fails code with non-ASCII identifiers,
1026 # like ./ext/Encode/t/jperl.t
8e3542b6 1027 die "Unexpected our($text)\n" unless $text =~ /^\W(\w+::)*\w+\z/;
d989cdac 1028 $text =~ s/(\w+::)+//;
8e3542b6 1029 }
e8d3f51b 1030 if (want_scalar($op)) {
ce4e655d 1031 return "$our_local $text";
e8d3f51b 1032 } else {
ce4e655d 1033 return $self->maybe_parens_func("$our_local", $text, $cx, 16);
e8d3f51b 1034 }
6e90668e
SM
1035 } else {
1036 return $text;
a798dbf2 1037 }
a798dbf2
MB
1038}
1039
3ed82cfc
GS
1040sub maybe_targmy {
1041 my $self = shift;
1042 my($op, $cx, $func, @args) = @_;
1043 if ($op->private & OPpTARGET_MY) {
1044 my $var = $self->padname($op->targ);
1045 my $val = $func->($self, $op, 7, @args);
1046 return $self->maybe_parens("$var = $val", $cx, 7);
1047 } else {
1048 return $func->($self, $op, $cx, @args);
1049 }
1050}
1051
6e90668e
SM
1052sub padname_sv {
1053 my $self = shift;
1054 my $targ = shift;
d989cdac 1055 return $self->{'curcv'}->PADLIST->ARRAYelt(0)->ARRAYelt($targ);
6e90668e
SM
1056}
1057
1058sub maybe_my {
1059 my $self = shift;
9d2c6865 1060 my($op, $cx, $text) = @_;
4c1f658f 1061 if ($op->private & OPpLVAL_INTRO and not $self->{'avoid_local'}{$$op}) {
3462b4ac 1062 my $my = $op->private & OPpPAD_STATE ? "state" : "my";
e8d3f51b 1063 if (want_scalar($op)) {
3462b4ac 1064 return "$my $text";
e8d3f51b 1065 } else {
3462b4ac 1066 return $self->maybe_parens_func($my, $text, $cx, 16);
e8d3f51b 1067 }
6e90668e
SM
1068 } else {
1069 return $text;
1070 }
1071}
1072
9d2c6865
SM
1073# The following OPs don't have functions:
1074
1075# pp_padany -- does not exist after parsing
9d2c6865 1076
2ae48fff
RGS
1077sub AUTOLOAD {
1078 if ($AUTOLOAD =~ s/^.*::pp_//) {
1079 warn "unexpected OP_".uc $AUTOLOAD;
1080 return "XXX";
1081 } else {
1082 die "Undefined subroutine $AUTOLOAD called";
1083 }
9d2c6865 1084}
6e90668e 1085
611c1e95
IZ
1086sub DESTROY {} # Do not AUTOLOAD
1087
ce4e655d
RH
1088# $root should be the op which represents the root of whatever
1089# we're sequencing here. If it's undefined, then we don't append
1090# any subroutine declarations to the deparsed ops, otherwise we
1091# append appropriate declarations.
58cccf98 1092sub lineseq {
ce4e655d 1093 my($self, $root, @ops) = @_;
58cccf98 1094 my($expr, @exprs);
ce4e655d
RH
1095
1096 my $out_cop = $self->{'curcop'};
1097 my $out_seq = defined($out_cop) ? $out_cop->cop_seq : undef;
1098 my $limit_seq;
1099 if (defined $root) {
1100 $limit_seq = $out_seq;
76df5e8f
DM
1101 my $nseq;
1102 $nseq = $self->find_scope_st($root->sibling) if ${$root->sibling};
ce4e655d
RH
1103 $limit_seq = $nseq if !defined($limit_seq)
1104 or defined($nseq) && $nseq < $limit_seq;
1105 }
1106 $limit_seq = $self->{'limit_seq'}
1107 if defined($self->{'limit_seq'})
1108 && (!defined($limit_seq) || $self->{'limit_seq'} < $limit_seq);
1109 local $self->{'limit_seq'} = $limit_seq;
58cccf98 1110 for (my $i = 0; $i < @ops; $i++) {
6e90668e 1111 $expr = "";
58cccf98
SM
1112 if (is_state $ops[$i]) {
1113 $expr = $self->deparse($ops[$i], 0);
1114 $i++;
e99ebc55
RH
1115 if ($i > $#ops) {
1116 push @exprs, $expr;
1117 last;
1118 }
58cccf98 1119 }
c73811ab
RH
1120 if (!is_state $ops[$i] and (my $ls = $ops[$i+1]) and
1121 !null($ops[$i+1]) and $ops[$i+1]->name eq "lineseq")
58cccf98 1122 {
c73811ab
RH
1123 if ($ls->first && !null($ls->first) && is_state($ls->first)
1124 && (my $sib = $ls->first->sibling)) {
1125 if (!null($sib) && $sib->name eq "leaveloop") {
1126 push @exprs, $expr . $self->for_loop($ops[$i], 0);
1127 $i++;
1128 next;
1129 }
1130 }
6e90668e 1131 }
d989cdac 1132 $expr .= $self->deparse($ops[$i], (@ops != 1)/2);
e99ebc55 1133 $expr =~ s/;\n?\z//;
f99a63a2 1134 push @exprs, $expr;
6e90668e 1135 }
ce4e655d
RH
1136 my $body = join(";\n", grep {length} @exprs);
1137 my $subs = "";
67fc2416 1138 if (defined $root && defined $limit_seq && !$self->{'in_format'}) {
ce4e655d
RH
1139 $subs = join "\n", $self->seq_subs($limit_seq);
1140 }
1141 return join(";\n", grep {length} $body, $subs);
6e90668e
SM
1142}
1143
58cccf98 1144sub scopeop {
d989cdac 1145 my($real_block, $self, $op, $cx) = @_;
58cccf98
SM
1146 my $kid;
1147 my @kids;
a0405c92
RH
1148
1149 local(@$self{qw'curstash warnings hints'})
1150 = @$self{qw'curstash warnings hints'} if $real_block;
58cccf98
SM
1151 if ($real_block) {
1152 $kid = $op->first->sibling; # skip enter
1153 if (is_miniwhile($kid)) {
1154 my $top = $kid->first;
1155 my $name = $top->name;
1156 if ($name eq "and") {
1157 $name = "while";
1158 } elsif ($name eq "or") {
1159 $name = "until";
1160 } else { # no conditional -> while 1 or until 0
1161 return $self->deparse($top->first, 1) . " while 1";
1162 }
1163 my $cond = $top->first;
1164 my $body = $cond->sibling->first; # skip lineseq
1165 $cond = $self->deparse($cond, 1);
1166 $body = $self->deparse($body, 1);
1167 return "$body $name $cond";
6e90668e 1168 }
58cccf98
SM
1169 } else {
1170 $kid = $op->first;
1171 }
1172 for (; !null($kid); $kid = $kid->sibling) {
1173 push @kids, $kid;
6e90668e 1174 }
d989cdac 1175 if ($cx > 0) { # inside an expression, (a do {} while for lineseq)
ce4e655d 1176 return "do {\n\t" . $self->lineseq($op, @kids) . "\n\b}";
9d2c6865 1177 } else {
ce4e655d 1178 my $lineseq = $self->lineseq($op, @kids);
7a9b44b9 1179 return (length ($lineseq) ? "$lineseq;" : "");
6e90668e 1180 }
6e90668e
SM
1181}
1182
ce4e655d 1183sub pp_scope { scopeop(0, @_); }
58cccf98
SM
1184sub pp_lineseq { scopeop(0, @_); }
1185sub pp_leave { scopeop(1, @_); }
9d2c6865 1186
d989cdac
SM
1187# This is a special case of scopeop and lineseq, for the case of the
1188# main_root. The difference is that we print the output statements as
1189# soon as we get them, for the sake of impatient users.
1190sub deparse_root {
1191 my $self = shift;
1192 my($op) = @_;
1193 local(@$self{qw'curstash warnings hints'})
1194 = @$self{qw'curstash warnings hints'};
1195 my @kids;
4ca8de37 1196 return if null $op->first; # Can happen, e.g., for Bytecode without -k
d989cdac
SM
1197 for (my $kid = $op->first->sibling; !null($kid); $kid = $kid->sibling) {
1198 push @kids, $kid;
1199 }
1200 for (my $i = 0; $i < @kids; $i++) {
1201 my $expr = "";
1202 if (is_state $kids[$i]) {
1203 $expr = $self->deparse($kids[$i], 0);
1204 $i++;
1205 if ($i > $#kids) {
1206 print $self->indent($expr);
1207 last;
1208 }
1209 }
1210 if (is_for_loop($kids[$i])) {
1211 $expr .= $self->for_loop($kids[$i], 0);
1212 $expr .= ";\n" unless $i == $#kids;
1213 print $self->indent($expr);
1214 $i++;
1215 next;
1216 }
1217 $expr .= $self->deparse($kids[$i], (@kids != 1)/2);
1218 $expr =~ s/;\n?\z//;
1219 $expr .= ";";
1220 print $self->indent($expr);
1221 print "\n" unless $i == $#kids;
1222 }
1223}
1224
6e90668e
SM
1225# The BEGIN {} is used here because otherwise this code isn't executed
1226# when you run B::Deparse on itself.
1227my %globalnames;
1228BEGIN { map($globalnames{$_}++, "SIG", "STDIN", "STDOUT", "STDERR", "INC",
1229 "ENV", "ARGV", "ARGVOUT", "_"); }
1230
1231sub gv_name {
1232 my $self = shift;
1233 my $gv = shift;
c6e79e55 1234Carp::confess() unless ref($gv) eq "B::GV";
6e90668e 1235 my $stash = $gv->STASH->NAME;
d9963e60 1236 my $name = $gv->SAFENAME;
5c55e82c
HS
1237 if (($stash eq 'main' && $globalnames{$name})
1238 or ($stash eq $self->{'curstash'} && !$globalnames{$name})
644838b9 1239 or $name =~ /^[^A-Za-z_:]/)
9d2c6865 1240 {
6e90668e
SM
1241 $stash = "";
1242 } else {
1243 $stash = $stash . "::";
a798dbf2 1244 }
083bda02
MS
1245 if ($name =~ /^(\^..|{)/) {
1246 $name = "{$name}"; # ${^WARNING_BITS}, etc and ${
6e90668e
SM
1247 }
1248 return $stash . $name;
a798dbf2
MB
1249}
1250
8510e997
RH
1251# Return the name to use for a stash variable.
1252# If a lexical with the same name is in scope, it may need to be
1253# fully-qualified.
1254sub stash_variable {
1255 my ($self, $prefix, $name) = @_;
1256
1257 return "$prefix$name" if $name =~ /::/;
1258
d989cdac 1259 unless ($prefix eq '$' || $prefix eq '@' || #'
8510e997
RH
1260 $prefix eq '%' || $prefix eq '$#') {
1261 return "$prefix$name";
1262 }
1263
1264 my $v = ($prefix eq '$#' ? '@' : $prefix) . $name;
1265 return $prefix .$self->{'curstash'}.'::'. $name if $self->lex_in_scope($v);
1266 return "$prefix$name";
1267}
1268
1269sub lex_in_scope {
1270 my ($self, $name) = @_;
1271 $self->populate_curcvlex() if !defined $self->{'curcvlex'};
1272
6ec152c3 1273 return 0 if !defined($self->{'curcop'});
8510e997
RH
1274 my $seq = $self->{'curcop'}->cop_seq;
1275 return 0 if !exists $self->{'curcvlex'}{$name};
1276 for my $a (@{$self->{'curcvlex'}{$name}}) {
1277 my ($st, $en) = @$a;
1278 return 1 if $seq > $st && $seq <= $en;
1279 }
1280 return 0;
1281}
1282
1283sub populate_curcvlex {
1284 my $self = shift;
ce4e655d 1285 for (my $cv = $self->{'curcv'}; class($cv) eq "CV"; $cv = $cv->OUTSIDE) {
7dafbf52
DM
1286 my $padlist = $cv->PADLIST;
1287 # an undef CV still in lexical chain
1288 next if class($padlist) eq "SPECIAL";
1289 my @padlist = $padlist->ARRAY;
8510e997
RH
1290 my @ns = $padlist[0]->ARRAY;
1291
1292 for (my $i=0; $i<@ns; ++$i) {
1293 next if class($ns[$i]) eq "SPECIAL";
ce4e655d 1294 next if $ns[$i]->FLAGS & SVpad_OUR; # Skip "our" vars
0f2fe21d
RH
1295 if (class($ns[$i]) eq "PV") {
1296 # Probably that pesky lexical @_
1297 next;
1298 }
8510e997 1299 my $name = $ns[$i]->PVX;
7dafbf52
DM
1300 my ($seq_st, $seq_en) =
1301 ($ns[$i]->FLAGS & SVf_FAKE)
1302 ? (0, 999999)
809abb02 1303 : ($ns[$i]->COP_SEQ_RANGE_LOW, $ns[$i]->COP_SEQ_RANGE_HIGH);
8510e997
RH
1304
1305 push @{$self->{'curcvlex'}{$name}}, [$seq_st, $seq_en];
1306 }
1307 }
1308}
1309
ce4e655d
RH
1310sub find_scope_st { ((find_scope(@_))[0]); }
1311sub find_scope_en { ((find_scope(@_))[1]); }
1312
1313# Recurses down the tree, looking for pad variable introductions and COPs
1314sub find_scope {
1315 my ($self, $op, $scope_st, $scope_en) = @_;
ff97752d 1316 carp("Undefined op in find_scope") if !defined $op;
ce4e655d
RH
1317 return ($scope_st, $scope_en) unless $op->flags & OPf_KIDS;
1318
b6b46d6f
AB
1319 my @queue = ($op);
1320 while(my $op = shift @queue ) {
1321 for (my $o=$op->first; $$o; $o=$o->sibling) {
1322 if ($o->name =~ /^pad.v$/ && $o->private & OPpLVAL_INTRO) {
1323 my $s = int($self->padname_sv($o->targ)->COP_SEQ_RANGE_LOW);
1324 my $e = $self->padname_sv($o->targ)->COP_SEQ_RANGE_HIGH;
1325 $scope_st = $s if !defined($scope_st) || $s < $scope_st;
1326 $scope_en = $e if !defined($scope_en) || $e > $scope_en;
1327 return ($scope_st, $scope_en);
1328 }
1329 elsif (is_state($o)) {
1330 my $c = $o->cop_seq;
1331 $scope_st = $c if !defined($scope_st) || $c < $scope_st;
1332 $scope_en = $c if !defined($scope_en) || $c > $scope_en;
1333 return ($scope_st, $scope_en);
1334 }
1335 elsif ($o->flags & OPf_KIDS) {
1336 unshift (@queue, $o);
1337 }
34a48b4b
RH
1338 }
1339 }
ce4e655d
RH
1340
1341 return ($scope_st, $scope_en);
34a48b4b
RH
1342}
1343
1344# Returns a list of subs which should be inserted before the COP
1345sub cop_subs {
1346 my ($self, $op, $out_seq) = @_;
1347 my $seq = $op->cop_seq;
1348 # If we have nephews, then our sequence number indicates
1349 # the cop_seq of the end of some sort of scope.
1350 if (class($op->sibling) ne "NULL" && $op->sibling->flags & OPf_KIDS
ce4e655d
RH
1351 and my $nseq = $self->find_scope_st($op->sibling) ) {
1352 $seq = $nseq;
34a48b4b
RH
1353 }
1354 $seq = $out_seq if defined($out_seq) && $out_seq < $seq;
1355 return $self->seq_subs($seq);
1356}
1357
1358sub seq_subs {
1359 my ($self, $seq) = @_;
1360 my @text;
1361#push @text, "# ($seq)\n";
1362
ce4e655d 1363 return "" if !defined $seq;
34a48b4b
RH
1364 while (scalar(@{$self->{'subs_todo'}})
1365 and $seq > $self->{'subs_todo'}[0][0]) {
1366 push @text, $self->next_todo;
1367 }
1368 return @text;
1369}
1370
08c6f5ec 1371# Notice how subs and formats are inserted between statements here;
a0405c92 1372# also $[ assignments and pragmas.
6e90668e
SM
1373sub pp_nextstate {
1374 my $self = shift;
9d2c6865 1375 my($op, $cx) = @_;
34a48b4b 1376 $self->{'curcop'} = $op;
6e90668e 1377 my @text;
34a48b4b 1378 push @text, $self->cop_subs($op);
e99ebc55 1379 push @text, $op->label . ": " if $op->label;
11faa288 1380 my $stash = $op->stashpv;
6e90668e
SM
1381 if ($stash ne $self->{'curstash'}) {
1382 push @text, "package $stash;\n";
1383 $self->{'curstash'} = $stash;
1384 }
08c6f5ec 1385
7a9b44b9
RH
1386 if ($self->{'arybase'} != $op->arybase) {
1387 push @text, '$[ = '. $op->arybase .";\n";
1388 $self->{'arybase'} = $op->arybase;
1389 }
1390
1391 my $warnings = $op->warnings;
1392 my $warning_bits;
1393 if ($warnings->isa("B::SPECIAL") && $$warnings == 4) {
810aef70 1394 $warning_bits = $warnings::Bits{"all"} & WARN_MASK;
7a9b44b9 1395 }
e31885a0 1396 elsif ($warnings->isa("B::SPECIAL") && $$warnings == 5) {
810aef70 1397 $warning_bits = $warnings::NONE;
7a9b44b9 1398 }
e31885a0
RH
1399 elsif ($warnings->isa("B::SPECIAL")) {
1400 $warning_bits = undef;
1401 }
7a9b44b9 1402 else {
34a48b4b 1403 $warning_bits = $warnings->PV & WARN_MASK;
7a9b44b9
RH
1404 }
1405
e31885a0
RH
1406 if (defined ($warning_bits) and
1407 !defined($self->{warnings}) || $self->{'warnings'} ne $warning_bits) {
08c6f5ec 1408 push @text, declare_warnings($self->{'warnings'}, $warning_bits);
7a9b44b9
RH
1409 $self->{'warnings'} = $warning_bits;
1410 }
1411
d5ec2987
NC
1412 if ($self->{'hints'} != $op->hints) {
1413 push @text, declare_hints($self->{'hints'}, $op->hints);
1414 $self->{'hints'} = $op->hints;
a0405c92
RH
1415 }
1416
d989cdac
SM
1417 # This should go after of any branches that add statements, to
1418 # increase the chances that it refers to the same line it did in
1419 # the original program.
1420 if ($self->{'linenums'}) {
1421 push @text, "\f#line " . $op->line .
1422 ' "' . $op->file, qq'"\n';
1423 }
1424
6e90668e
SM
1425 return join("", @text);
1426}
1427
08c6f5ec
RH
1428sub declare_warnings {
1429 my ($from, $to) = @_;
e6f1f756 1430 if (($to & WARN_MASK) eq (warnings::bits("all") & WARN_MASK)) {
a0405c92
RH
1431 return "use warnings;\n";
1432 }
e6f1f756 1433 elsif (($to & WARN_MASK) eq ("\0"x length($to) & WARN_MASK)) {
a0405c92
RH
1434 return "no warnings;\n";
1435 }
51a5edaf 1436 return "BEGIN {\${^WARNING_BITS} = ".perlstring($to)."}\n";
a0405c92
RH
1437}
1438
1439sub declare_hints {
1440 my ($from, $to) = @_;
a0035eb8
RH
1441 my $use = $to & ~$from;
1442 my $no = $from & ~$to;
1443 my $decls = "";
1444 for my $pragma (hint_pragmas($use)) {
1445 $decls .= "use $pragma;\n";
1446 }
1447 for my $pragma (hint_pragmas($no)) {
1448 $decls .= "no $pragma;\n";
1449 }
1450 return $decls;
1451}
1452
1453sub hint_pragmas {
1454 my ($bits) = @_;
1455 my @pragmas;
1456 push @pragmas, "integer" if $bits & 0x1;
1457 push @pragmas, "strict 'refs'" if $bits & 0x2;
1458 push @pragmas, "bytes" if $bits & 0x8;
1459 return @pragmas;
08c6f5ec
RH
1460}
1461
6e90668e 1462sub pp_dbstate { pp_nextstate(@_) }
3f872cb9 1463sub pp_setstate { pp_nextstate(@_) }
6e90668e
SM
1464
1465sub pp_unstack { return "" } # see also leaveloop
1466
1467sub baseop {
1468 my $self = shift;
9d2c6865 1469 my($op, $cx, $name) = @_;
6e90668e
SM
1470 return $name;
1471}
1472
e99ebc55
RH
1473sub pp_stub {
1474 my $self = shift;
1475 my($op, $cx, $name) = @_;
d989cdac 1476 if ($cx >= 1) {
e99ebc55
RH
1477 return "()";
1478 }
1479 else {
1480 return "();";
1481 }
1482}
6e90668e
SM
1483sub pp_wantarray { baseop(@_, "wantarray") }
1484sub pp_fork { baseop(@_, "fork") }
3ed82cfc
GS
1485sub pp_wait { maybe_targmy(@_, \&baseop, "wait") }
1486sub pp_getppid { maybe_targmy(@_, \&baseop, "getppid") }
1487sub pp_time { maybe_targmy(@_, \&baseop, "time") }
6e90668e
SM
1488sub pp_tms { baseop(@_, "times") }
1489sub pp_ghostent { baseop(@_, "gethostent") }
1490sub pp_gnetent { baseop(@_, "getnetent") }
1491sub pp_gprotoent { baseop(@_, "getprotoent") }
1492sub pp_gservent { baseop(@_, "getservent") }
1493sub pp_ehostent { baseop(@_, "endhostent") }
1494sub pp_enetent { baseop(@_, "endnetent") }
1495sub pp_eprotoent { baseop(@_, "endprotoent") }
1496sub pp_eservent { baseop(@_, "endservent") }
1497sub pp_gpwent { baseop(@_, "getpwent") }
1498sub pp_spwent { baseop(@_, "setpwent") }
1499sub pp_epwent { baseop(@_, "endpwent") }
1500sub pp_ggrent { baseop(@_, "getgrent") }
1501sub pp_sgrent { baseop(@_, "setgrent") }
1502sub pp_egrent { baseop(@_, "endgrent") }
1503sub pp_getlogin { baseop(@_, "getlogin") }
1504
1505sub POSTFIX () { 1 }
1506
9d2c6865
SM
1507# I couldn't think of a good short name, but this is the category of
1508# symbolic unary operators with interesting precedence
1509
1510sub pfixop {
1511 my $self = shift;
1512 my($op, $cx, $name, $prec, $flags) = (@_, 0);
1513 my $kid = $op->first;
1514 $kid = $self->deparse($kid, $prec);
1515 return $self->maybe_parens(($flags & POSTFIX) ? "$kid$name" : "$name$kid",
1516 $cx, $prec);
1517}
1518
1519sub pp_preinc { pfixop(@_, "++", 23) }
1520sub pp_predec { pfixop(@_, "--", 23) }
3ed82cfc
GS
1521sub pp_postinc { maybe_targmy(@_, \&pfixop, "++", 23, POSTFIX) }
1522sub pp_postdec { maybe_targmy(@_, \&pfixop, "--", 23, POSTFIX) }
9d2c6865
SM
1523sub pp_i_preinc { pfixop(@_, "++", 23) }
1524sub pp_i_predec { pfixop(@_, "--", 23) }
3ed82cfc
GS
1525sub pp_i_postinc { maybe_targmy(@_, \&pfixop, "++", 23, POSTFIX) }
1526sub pp_i_postdec { maybe_targmy(@_, \&pfixop, "--", 23, POSTFIX) }
68cc8748 1527sub pp_complement { maybe_targmy(@_, \&pfixop, "~", 21) }
9d2c6865 1528
3ed82cfc
GS
1529sub pp_negate { maybe_targmy(@_, \&real_negate) }
1530sub real_negate {
9d2c6865
SM
1531 my $self = shift;
1532 my($op, $cx) = @_;
3f872cb9 1533 if ($op->first->name =~ /^(i_)?negate$/) {
9d2c6865
SM
1534 # avoid --$x
1535 $self->pfixop($op, $cx, "-", 21.5);
1536 } else {
1537 $self->pfixop($op, $cx, "-", 21);
1538 }
1539}
1540sub pp_i_negate { pp_negate(@_) }
1541
1542sub pp_not {
1543 my $self = shift;
1544 my($op, $cx) = @_;
1545 if ($cx <= 4) {
1546 $self->pfixop($op, $cx, "not ", 4);
1547 } else {
1548 $self->pfixop($op, $cx, "!", 21);
1549 }
1550}
1551
6e90668e
SM
1552sub unop {
1553 my $self = shift;
f4a44678 1554 my($op, $cx, $name) = @_;
6e90668e 1555 my $kid;
9d2c6865 1556 if ($op->flags & OPf_KIDS) {
6e90668e 1557 $kid = $op->first;
d989cdac 1558 if (defined prototype("CORE::$name")
e31885a0
RH
1559 && prototype("CORE::$name") =~ /^;?\*/
1560 && $kid->name eq "rv2gv") {
1561 $kid = $kid->first;
1562 }
1563
9d2c6865 1564 return $self->maybe_parens_unop($name, $kid, $cx);
6e90668e 1565 } else {
d989cdac 1566 return $name . ($op->flags & OPf_SPECIAL ? "()" : "");
6e90668e 1567 }
6e90668e
SM
1568}
1569
3ed82cfc
GS
1570sub pp_chop { maybe_targmy(@_, \&unop, "chop") }
1571sub pp_chomp { maybe_targmy(@_, \&unop, "chomp") }
1572sub pp_schop { maybe_targmy(@_, \&unop, "chop") }
1573sub pp_schomp { maybe_targmy(@_, \&unop, "chomp") }
6e90668e
SM
1574sub pp_defined { unop(@_, "defined") }
1575sub pp_undef { unop(@_, "undef") }
1576sub pp_study { unop(@_, "study") }
6e90668e
SM
1577sub pp_ref { unop(@_, "ref") }
1578sub pp_pos { maybe_local(@_, unop(@_, "pos")) }
1579
3ed82cfc
GS
1580sub pp_sin { maybe_targmy(@_, \&unop, "sin") }
1581sub pp_cos { maybe_targmy(@_, \&unop, "cos") }
1582sub pp_rand { maybe_targmy(@_, \&unop, "rand") }
6e90668e 1583sub pp_srand { unop(@_, "srand") }
3ed82cfc
GS
1584sub pp_exp { maybe_targmy(@_, \&unop, "exp") }
1585sub pp_log { maybe_targmy(@_, \&unop, "log") }
1586sub pp_sqrt { maybe_targmy(@_, \&unop, "sqrt") }
1587sub pp_int { maybe_targmy(@_, \&unop, "int") }
1588sub pp_hex { maybe_targmy(@_, \&unop, "hex") }
1589sub pp_oct { maybe_targmy(@_, \&unop, "oct") }
1590sub pp_abs { maybe_targmy(@_, \&unop, "abs") }
1591
1592sub pp_length { maybe_targmy(@_, \&unop, "length") }
1593sub pp_ord { maybe_targmy(@_, \&unop, "ord") }
1594sub pp_chr { maybe_targmy(@_, \&unop, "chr") }
6e90668e
SM
1595
1596sub pp_each { unop(@_, "each") }
1597sub pp_values { unop(@_, "values") }
1598sub pp_keys { unop(@_, "keys") }
1599sub pp_pop { unop(@_, "pop") }
1600sub pp_shift { unop(@_, "shift") }
1601
1602sub pp_caller { unop(@_, "caller") }
1603sub pp_reset { unop(@_, "reset") }
1604sub pp_exit { unop(@_, "exit") }
1605sub pp_prototype { unop(@_, "prototype") }
1606
1607sub pp_close { unop(@_, "close") }
1608sub pp_fileno { unop(@_, "fileno") }
1609sub pp_umask { unop(@_, "umask") }
6e90668e
SM
1610sub pp_untie { unop(@_, "untie") }
1611sub pp_tied { unop(@_, "tied") }
1612sub pp_dbmclose { unop(@_, "dbmclose") }
1613sub pp_getc { unop(@_, "getc") }
1614sub pp_eof { unop(@_, "eof") }
1615sub pp_tell { unop(@_, "tell") }
1616sub pp_getsockname { unop(@_, "getsockname") }
1617sub pp_getpeername { unop(@_, "getpeername") }
1618
3ed82cfc
GS
1619sub pp_chdir { maybe_targmy(@_, \&unop, "chdir") }
1620sub pp_chroot { maybe_targmy(@_, \&unop, "chroot") }
6e90668e 1621sub pp_readlink { unop(@_, "readlink") }
3ed82cfc 1622sub pp_rmdir { maybe_targmy(@_, \&unop, "rmdir") }
6e90668e
SM
1623sub pp_readdir { unop(@_, "readdir") }
1624sub pp_telldir { unop(@_, "telldir") }
1625sub pp_rewinddir { unop(@_, "rewinddir") }
1626sub pp_closedir { unop(@_, "closedir") }
3ed82cfc 1627sub pp_getpgrp { maybe_targmy(@_, \&unop, "getpgrp") }
6e90668e
SM
1628sub pp_localtime { unop(@_, "localtime") }
1629sub pp_gmtime { unop(@_, "gmtime") }
1630sub pp_alarm { unop(@_, "alarm") }
3ed82cfc 1631sub pp_sleep { maybe_targmy(@_, \&unop, "sleep") }
6e90668e
SM
1632
1633sub pp_dofile { unop(@_, "do") }
1634sub pp_entereval { unop(@_, "eval") }
1635
1636sub pp_ghbyname { unop(@_, "gethostbyname") }
1637sub pp_gnbyname { unop(@_, "getnetbyname") }
1638sub pp_gpbyname { unop(@_, "getprotobyname") }
1639sub pp_shostent { unop(@_, "sethostent") }
1640sub pp_snetent { unop(@_, "setnetent") }
1641sub pp_sprotoent { unop(@_, "setprotoent") }
1642sub pp_sservent { unop(@_, "setservent") }
1643sub pp_gpwnam { unop(@_, "getpwnam") }
1644sub pp_gpwuid { unop(@_, "getpwuid") }
1645sub pp_ggrnam { unop(@_, "getgrnam") }
1646sub pp_ggrgid { unop(@_, "getgrgid") }
1647
1648sub pp_lock { unop(@_, "lock") }
1649
0d863452
RH
1650sub pp_continue { unop(@_, "continue"); }
1651sub pp_break {
1652 my ($self, $op) = @_;
1653 return "" if $op->flags & OPf_SPECIAL;
1654 unop(@_, "break");
1655}
1656
1657sub givwhen {
1658 my $self = shift;
1659 my($op, $cx, $givwhen) = @_;
1660
1661 my $enterop = $op->first;
1662 my ($head, $block);
1663 if ($enterop->flags & OPf_SPECIAL) {
1664 $head = "default";
1665 $block = $self->deparse($enterop->first, 0);
1666 }
1667 else {
1668 my $cond = $enterop->first;
1669 my $cond_str = $self->deparse($cond, 1);
1670 $head = "$givwhen ($cond_str)";
1671 $block = $self->deparse($cond->sibling, 0);
1672 }
1673
1674 return "$head {\n".
1675 "\t$block\n".
1676 "\b}\cK";
1677}
1678
1679sub pp_leavegiven { givwhen(@_, "given"); }
1680sub pp_leavewhen { givwhen(@_, "when"); }
1681
6e90668e
SM
1682sub pp_exists {
1683 my $self = shift;
9d2c6865 1684 my($op, $cx) = @_;
34a48b4b
RH
1685 my $arg;
1686 if ($op->private & OPpEXISTS_SUB) {
1687 # Checking for the existence of a subroutine
1688 return $self->maybe_parens_func("exists",
1689 $self->pp_rv2cv($op->first, 16), $cx, 16);
1690 }
1691 if ($op->flags & OPf_SPECIAL) {
1692 # Array element, not hash element
1693 return $self->maybe_parens_func("exists",
1694 $self->pp_aelem($op->first, 16), $cx, 16);
1695 }
9d2c6865
SM
1696 return $self->maybe_parens_func("exists", $self->pp_helem($op->first, 16),
1697 $cx, 16);
6e90668e
SM
1698}
1699
6e90668e
SM
1700sub pp_delete {
1701 my $self = shift;
9d2c6865 1702 my($op, $cx) = @_;
6e90668e
SM
1703 my $arg;
1704 if ($op->private & OPpSLICE) {
34a48b4b
RH
1705 if ($op->flags & OPf_SPECIAL) {
1706 # Deleting from an array, not a hash
1707 return $self->maybe_parens_func("delete",
1708 $self->pp_aslice($op->first, 16),
1709 $cx, 16);
1710 }
9d2c6865
SM
1711 return $self->maybe_parens_func("delete",
1712 $self->pp_hslice($op->first, 16),
1713 $cx, 16);
6e90668e 1714 } else {
34a48b4b
RH
1715 if ($op->flags & OPf_SPECIAL) {
1716 # Deleting from an array, not a hash
1717 return $self->maybe_parens_func("delete",
1718 $self->pp_aelem($op->first, 16),
1719 $cx, 16);
1720 }
9d2c6865
SM
1721 return $self->maybe_parens_func("delete",
1722 $self->pp_helem($op->first, 16),
1723 $cx, 16);
6e90668e 1724 }
6e90668e
SM
1725}
1726
6e90668e
SM
1727sub pp_require {
1728 my $self = shift;
9d2c6865 1729 my($op, $cx) = @_;
d5889722 1730 my $opname = $op->flags & OPf_SPECIAL ? 'CORE::require' : 'require';
3f872cb9 1731 if (class($op) eq "UNOP" and $op->first->name eq "const"
4c1f658f 1732 and $op->first->private & OPpCONST_BARE)
6e90668e 1733 {
18228111 1734 my $name = $self->const_sv($op->first)->PV;
6e90668e
SM
1735 $name =~ s[/][::]g;
1736 $name =~ s/\.pm//g;
d5889722 1737 return "$opname $name";
6e90668e 1738 } else {
d5889722 1739 $self->unop($op, $cx, $opname);
6e90668e
SM
1740 }
1741}
1742
d989cdac 1743sub pp_scalar {
9d2c6865 1744 my $self = shift;
d9002312 1745 my($op, $cx) = @_;
9d2c6865
SM
1746 my $kid = $op->first;
1747 if (not null $kid->sibling) {
1748 # XXX Was a here-doc
1749 return $self->dquote($op);
1750 }
1751 $self->unop(@_, "scalar");
1752}
1753
1754
6e90668e
SM
1755sub padval {
1756 my $self = shift;
1757 my $targ = shift;
d989cdac 1758 return $self->{'curcv'}->PADLIST->ARRAYelt(1)->ARRAYelt($targ);
6e90668e
SM
1759}
1760
78c72037
NC
1761sub anon_hash_or_list {
1762 my $self = shift;
d9002312 1763 my($op, $cx) = @_;
78c72037
NC
1764
1765 my($pre, $post) = @{{"anonlist" => ["[","]"],
1766 "anonhash" => ["{","}"]}->{$op->name}};
1767 my($expr, @exprs);
1768 $op = $op->first->sibling; # skip pushmark
1769 for (; !null($op); $op = $op->sibling) {
1770 $expr = $self->deparse($op, 6);
1771 push @exprs, $expr;
1772 }
d9002312
SM
1773 if ($pre eq "{" and $cx < 1) {
1774 # Disambiguate that it's not a block
1775 $pre = "+{";
1776 }
78c72037
NC
1777 return $pre . join(", ", @exprs) . $post;
1778}
1779
1780sub pp_anonlist {
d9002312
SM
1781 my $self = shift;
1782 my ($op, $cx) = @_;
78c72037 1783 if ($op->flags & OPf_SPECIAL) {
d9002312 1784 return $self->anon_hash_or_list($op, $cx);
78c72037
NC
1785 }
1786 warn "Unexpected op pp_" . $op->name() . " without OPf_SPECIAL";
1787 return 'XXX';
1788}
1789
1790*pp_anonhash = \&pp_anonlist;
1791
6e90668e
SM
1792sub pp_refgen {
1793 my $self = shift;
9d2c6865 1794 my($op, $cx) = @_;
6e90668e 1795 my $kid = $op->first;
3f872cb9 1796 if ($kid->name eq "null") {
6e90668e 1797 $kid = $kid->first;
3f872cb9 1798 if ($kid->name eq "anonlist" || $kid->name eq "anonhash") {
d9002312 1799 return $self->anon_hash_or_list($op, $cx);
d989cdac 1800 } elsif (!null($kid->sibling) and
3f872cb9 1801 $kid->sibling->name eq "anoncode") {
6e90668e
SM
1802 return "sub " .
1803 $self->deparse_sub($self->padval($kid->sibling->targ));
3f872cb9
GS
1804 } elsif ($kid->name eq "pushmark") {
1805 my $sib_name = $kid->sibling->name;
1806 if ($sib_name =~ /^(pad|rv2)[ah]v$/
c8c62db7
AD
1807 and not $kid->sibling->flags & OPf_REF)
1808 {
1809 # The @a in \(@a) isn't in ref context, but only when the
1810 # parens are there.
127212b2 1811 return "\\(" . $self->pp_list($op->first) . ")";
3f872cb9 1812 } elsif ($sib_name eq 'entersub') {
c8c62db7
AD
1813 my $text = $self->deparse($kid->sibling, 1);
1814 # Always show parens for \(&func()), but only with -p otherwise
1815 $text = "($text)" if $self->{'parens'}
1816 or $kid->sibling->private & OPpENTERSUB_AMPER;
1817 return "\\$text";
1818 }
1819 }
6e90668e 1820 }
9d2c6865 1821 $self->pfixop($op, $cx, "\\", 20);
6e90668e
SM
1822}
1823
1824sub pp_srefgen { pp_refgen(@_) }
1825
1826sub pp_readline {
1827 my $self = shift;
9d2c6865 1828 my($op, $cx) = @_;
6e90668e 1829 my $kid = $op->first;
3f872cb9 1830 $kid = $kid->first if $kid->name eq "rv2gv"; # <$fh>
e31885a0
RH
1831 return "<" . $self->deparse($kid, 1) . ">" if is_scalar($kid);
1832 return $self->unop($op, $cx, "readline");
6e90668e
SM
1833}
1834
ad8caead
RGS
1835sub pp_rcatline {
1836 my $self = shift;
1837 my($op) = @_;
d989cdac 1838 return "<" . $self->gv_name($self->gv_or_padgv($op)) . ">";
ad8caead
RGS
1839}
1840
bd0865ec
GS
1841# Unary operators that can occur as pseudo-listops inside double quotes
1842sub dq_unop {
1843 my $self = shift;
1844 my($op, $cx, $name, $prec, $flags) = (@_, 0, 0);
1845 my $kid;
1846 if ($op->flags & OPf_KIDS) {
1847 $kid = $op->first;
1848 # If there's more than one kid, the first is an ex-pushmark.
1849 $kid = $kid->sibling if not null $kid->sibling;
1850 return $self->maybe_parens_unop($name, $kid, $cx);
1851 } else {
d989cdac 1852 return $name . ($op->flags & OPf_SPECIAL ? "()" : "");
bd0865ec
GS
1853 }
1854}
1855
1856sub pp_ucfirst { dq_unop(@_, "ucfirst") }
1857sub pp_lcfirst { dq_unop(@_, "lcfirst") }
1858sub pp_uc { dq_unop(@_, "uc") }
1859sub pp_lc { dq_unop(@_, "lc") }
3ed82cfc 1860sub pp_quotemeta { maybe_targmy(@_, \&dq_unop, "quotemeta") }
bd0865ec 1861
6e90668e
SM
1862sub loopex {
1863 my $self = shift;
9d2c6865 1864 my ($op, $cx, $name) = @_;
6e90668e 1865 if (class($op) eq "PVOP") {
9d2c6865
SM
1866 return "$name " . $op->pv;
1867 } elsif (class($op) eq "OP") {
1868 return $name;
6e90668e 1869 } elsif (class($op) eq "UNOP") {
9d2c6865
SM
1870 # Note -- loop exits are actually exempt from the
1871 # looks-like-a-func rule, but a few extra parens won't hurt
1872 return $self->maybe_parens_unop($name, $op->first, $cx);
6e90668e 1873 }
6e90668e
SM
1874}
1875
1876sub pp_last { loopex(@_, "last") }
1877sub pp_next { loopex(@_, "next") }
1878sub pp_redo { loopex(@_, "redo") }
1879sub pp_goto { loopex(@_, "goto") }
1880sub pp_dump { loopex(@_, "dump") }
1881
1882sub ftst {
1883 my $self = shift;
9d2c6865 1884 my($op, $cx, $name) = @_;
6e90668e 1885 if (class($op) eq "UNOP") {
9d2c6865
SM
1886 # Genuine `-X' filetests are exempt from the LLAFR, but not
1887 # l?stat(); for the sake of clarity, give'em all parens
1888 return $self->maybe_parens_unop($name, $op->first, $cx);
d989cdac 1889 } elsif (class($op) =~ /^(SV|PAD)OP$/) {
9d2c6865 1890 return $self->maybe_parens_func($name, $self->pp_gv($op, 1), $cx, 16);
6e90668e 1891 } else { # I don't think baseop filetests ever survive ck_ftst, but...
9d2c6865 1892 return $name;
6e90668e 1893 }
6e90668e
SM
1894}
1895
d989cdac
SM
1896sub pp_lstat { ftst(@_, "lstat") }
1897sub pp_stat { ftst(@_, "stat") }
1898sub pp_ftrread { ftst(@_, "-R") }
6e90668e 1899sub pp_ftrwrite { ftst(@_, "-W") }
d989cdac
SM
1900sub pp_ftrexec { ftst(@_, "-X") }
1901sub pp_fteread { ftst(@_, "-r") }
e31885a0 1902sub pp_ftewrite { ftst(@_, "-w") }
d989cdac
SM
1903sub pp_fteexec { ftst(@_, "-x") }
1904sub pp_ftis { ftst(@_, "-e") }
6e90668e
SM
1905sub pp_fteowned { ftst(@_, "-O") }
1906sub pp_ftrowned { ftst(@_, "-o") }
d989cdac
SM
1907sub pp_ftzero { ftst(@_, "-z") }
1908sub pp_ftsize { ftst(@_, "-s") }
1909sub pp_ftmtime { ftst(@_, "-M") }
1910sub pp_ftatime { ftst(@_, "-A") }
1911sub pp_ftctime { ftst(@_, "-C") }
1912sub pp_ftsock { ftst(@_, "-S") }
1913sub pp_ftchr { ftst(@_, "-c") }
1914sub pp_ftblk { ftst(@_, "-b") }
1915sub pp_ftfile { ftst(@_, "-f") }
1916sub pp_ftdir { ftst(@_, "-d") }
1917sub pp_ftpipe { ftst(@_, "-p") }
1918sub pp_ftlink { ftst(@_, "-l") }
1919sub pp_ftsuid { ftst(@_, "-u") }
1920sub pp_ftsgid { ftst(@_, "-g") }
1921sub pp_ftsvtx { ftst(@_, "-k") }
1922sub pp_fttty { ftst(@_, "-t") }
1923sub pp_fttext { ftst(@_, "-T") }
6e90668e
SM
1924sub pp_ftbinary { ftst(@_, "-B") }
1925
a798dbf2 1926sub SWAP_CHILDREN () { 1 }
6e90668e 1927sub ASSIGN () { 2 } # has OP= variant
7013e6ae 1928sub LIST_CONTEXT () { 4 } # Assignment is in list context
6e90668e 1929
9d2c6865
SM
1930my(%left, %right);
1931
1932sub assoc_class {
1933 my $op = shift;
3f872cb9
GS
1934 my $name = $op->name;
1935 if ($name eq "concat" and $op->first->name eq "concat") {
9d2c6865 1936 # avoid spurious `=' -- see comment in pp_concat
3f872cb9 1937 return "concat";
9d2c6865 1938 }
3f872cb9
GS
1939 if ($name eq "null" and class($op) eq "UNOP"
1940 and $op->first->name =~ /^(and|x?or)$/
9d2c6865
SM
1941 and null $op->first->sibling)
1942 {
1943 # Like all conditional constructs, OP_ANDs and OP_ORs are topped
1944 # with a null that's used as the common end point of the two
1945 # flows of control. For precedence purposes, ignore it.
1946 # (COND_EXPRs have these too, but we don't bother with
1947 # their associativity).
1948 return assoc_class($op->first);
1949 }
1950 return $name . ($op->flags & OPf_STACKED ? "=" : "");
1951}
1952
1953# Left associative operators, like `+', for which
1954# $a + $b + $c is equivalent to ($a + $b) + $c
1955
1956BEGIN {
3f872cb9
GS
1957 %left = ('multiply' => 19, 'i_multiply' => 19,
1958 'divide' => 19, 'i_divide' => 19,
1959 'modulo' => 19, 'i_modulo' => 19,
1960 'repeat' => 19,
1961 'add' => 18, 'i_add' => 18,
1962 'subtract' => 18, 'i_subtract' => 18,
1963 'concat' => 18,
1964 'left_shift' => 17, 'right_shift' => 17,
1965 'bit_and' => 13,
1966 'bit_or' => 12, 'bit_xor' => 12,
1967 'and' => 3,
1968 'or' => 2, 'xor' => 2,
9d2c6865
SM
1969 );
1970}
1971
1972sub deparse_binop_left {
1973 my $self = shift;
1974 my($op, $left, $prec) = @_;
58231d39 1975 if ($left{assoc_class($op)} && $left{assoc_class($left)}
9d2c6865
SM
1976 and $left{assoc_class($op)} == $left{assoc_class($left)})
1977 {
1978 return $self->deparse($left, $prec - .00001);
1979 } else {
1980 return $self->deparse($left, $prec);
1981 }
1982}
1983
1984# Right associative operators, like `=', for which
1985# $a = $b = $c is equivalent to $a = ($b = $c)
1986
1987BEGIN {
3f872cb9
GS
1988 %right = ('pow' => 22,
1989 'sassign=' => 7, 'aassign=' => 7,
1990 'multiply=' => 7, 'i_multiply=' => 7,
1991 'divide=' => 7, 'i_divide=' => 7,
1992 'modulo=' => 7, 'i_modulo=' => 7,
1993 'repeat=' => 7,
1994 'add=' => 7, 'i_add=' => 7,
1995 'subtract=' => 7, 'i_subtract=' => 7,
1996 'concat=' => 7,
1997 'left_shift=' => 7, 'right_shift=' => 7,
1998 'bit_and=' => 7,
1999 'bit_or=' => 7, 'bit_xor=' => 7,
2000 'andassign' => 7,
2001 'orassign' => 7,
9d2c6865
SM
2002 );
2003}
2004
2005sub deparse_binop_right {
2006 my $self = shift;
2007 my($op, $right, $prec) = @_;
58231d39 2008 if ($right{assoc_class($op)} && $right{assoc_class($right)}
9d2c6865
SM
2009 and $right{assoc_class($op)} == $right{assoc_class($right)})
2010 {
2011 return $self->deparse($right, $prec - .00001);
2012 } else {
2013 return $self->deparse($right, $prec);
2014 }
2015}
2016
a798dbf2 2017sub binop {
6e90668e 2018 my $self = shift;
9d2c6865 2019 my ($op, $cx, $opname, $prec, $flags) = (@_, 0);
a798dbf2
MB
2020 my $left = $op->first;
2021 my $right = $op->last;
9d2c6865
SM
2022 my $eq = "";
2023 if ($op->flags & OPf_STACKED && $flags & ASSIGN) {
2024 $eq = "=";
2025 $prec = 7;
2026 }
a798dbf2
MB
2027 if ($flags & SWAP_CHILDREN) {
2028 ($left, $right) = ($right, $left);
2029 }
9d2c6865 2030 $left = $self->deparse_binop_left($op, $left, $prec);
90c0eb26
RH
2031 $left = "($left)" if $flags & LIST_CONTEXT
2032 && $left !~ /^(my|our|local|)[\@\(]/;
9d2c6865
SM
2033 $right = $self->deparse_binop_right($op, $right, $prec);
2034 return $self->maybe_parens("$left $opname$eq $right", $cx, $prec);
2035}
2036
3ed82cfc
GS
2037sub pp_add { maybe_targmy(@_, \&binop, "+", 18, ASSIGN) }
2038sub pp_multiply { maybe_targmy(@_, \&binop, "*", 19, ASSIGN) }
2039sub pp_subtract { maybe_targmy(@_, \&binop, "-",18, ASSIGN) }
2040sub pp_divide { maybe_targmy(@_, \&binop, "/", 19, ASSIGN) }
2041sub pp_modulo { maybe_targmy(@_, \&binop, "%", 19, ASSIGN) }
2042sub pp_i_add { maybe_targmy(@_, \&binop, "+", 18, ASSIGN) }
2043sub pp_i_multiply { maybe_targmy(@_, \&binop, "*", 19, ASSIGN) }
2044sub pp_i_subtract { maybe_targmy(@_, \&binop, "-", 18, ASSIGN) }
2045sub pp_i_divide { maybe_targmy(@_, \&binop, "/", 19, ASSIGN) }
2046sub pp_i_modulo { maybe_targmy(@_, \&binop, "%", 19, ASSIGN) }
2047sub pp_pow { maybe_targmy(@_, \&binop, "**", 22, ASSIGN) }
2048
2049sub pp_left_shift { maybe_targmy(@_, \&binop, "<<", 17, ASSIGN) }
2050sub pp_right_shift { maybe_targmy(@_, \&binop, ">>", 17, ASSIGN) }
2051sub pp_bit_and { maybe_targmy(@_, \&binop, "&", 13, ASSIGN) }
2052sub pp_bit_or { maybe_targmy(@_, \&binop, "|", 12, ASSIGN) }
2053sub pp_bit_xor { maybe_targmy(@_, \&binop, "^", 12, ASSIGN) }
9d2c6865
SM
2054
2055sub pp_eq { binop(@_, "==", 14) }
2056sub pp_ne { binop(@_, "!=", 14) }
2057sub pp_lt { binop(@_, "<", 15) }
2058sub pp_gt { binop(@_, ">", 15) }
2059sub pp_ge { binop(@_, ">=", 15) }
2060sub pp_le { binop(@_, "<=", 15) }
2061sub pp_ncmp { binop(@_, "<=>", 14) }
2062sub pp_i_eq { binop(@_, "==", 14) }
2063sub pp_i_ne { binop(@_, "!=", 14) }
2064sub pp_i_lt { binop(@_, "<", 15) }
2065sub pp_i_gt { binop(@_, ">", 15) }
2066sub pp_i_ge { binop(@_, ">=", 15) }
2067sub pp_i_le { binop(@_, "<=", 15) }
2068sub pp_i_ncmp { binop(@_, "<=>", 14) }
2069
2070sub pp_seq { binop(@_, "eq", 14) }
2071sub pp_sne { binop(@_, "ne", 14) }
2072sub pp_slt { binop(@_, "lt", 15) }
2073sub pp_sgt { binop(@_, "gt", 15) }
2074sub pp_sge { binop(@_, "ge", 15) }
2075sub pp_sle { binop(@_, "le", 15) }
2076sub pp_scmp { binop(@_, "cmp", 14) }
2077
2078sub pp_sassign { binop(@_, "=", 7, SWAP_CHILDREN) }
7013e6ae 2079sub pp_aassign { binop(@_, "=", 7, SWAP_CHILDREN | LIST_CONTEXT) }
6e90668e 2080
0d863452
RH
2081sub pp_smartmatch {
2082 my ($self, $op, $cx) = @_;
2083 if ($op->flags & OPf_SPECIAL) {
2084 return $self->deparse($op->first, $cx);
2085 }
2086 else {
2087 binop(@_, "~~", 14);
2088 }
2089}
2090
6e90668e
SM
2091# `.' is special because concats-of-concats are optimized to save copying
2092# by making all but the first concat stacked. The effect is as if the
2093# programmer had written `($a . $b) .= $c', except legal.
3ed82cfc
GS
2094sub pp_concat { maybe_targmy(@_, \&real_concat) }
2095sub real_concat {
6e90668e 2096 my $self = shift;
9d2c6865 2097 my($op, $cx) = @_;
6e90668e
SM
2098 my $left = $op->first;
2099 my $right = $op->last;
2100 my $eq = "";
9d2c6865 2101 my $prec = 18;
3f872cb9 2102 if ($op->flags & OPf_STACKED and $op->first->name ne "concat") {
6e90668e 2103 $eq = "=";
9d2c6865 2104 $prec = 7;
6e90668e 2105 }
9d2c6865
SM
2106 $left = $self->deparse_binop_left($op, $left, $prec);
2107 $right = $self->deparse_binop_right($op, $right, $prec);
2108 return $self->maybe_parens("$left .$eq $right", $cx, $prec);
6e90668e
SM
2109}
2110
2111# `x' is weird when the left arg is a list
2112sub pp_repeat {
2113 my $self = shift;
9d2c6865 2114 my($op, $cx) = @_;
6e90668e
SM
2115 my $left = $op->first;
2116 my $right = $op->last;
9d2c6865
SM
2117 my $eq = "";
2118 my $prec = 19;
2119 if ($op->flags & OPf_STACKED) {
2120 $eq = "=";
2121 $prec = 7;
2122 }
6e90668e
SM
2123 if (null($right)) { # list repeat; count is inside left-side ex-list
2124 my $kid = $left->first->sibling; # skip pushmark
2125 my @exprs;
2126 for (; !null($kid->sibling); $kid = $kid->sibling) {
9d2c6865 2127 push @exprs, $self->deparse($kid, 6);
6e90668e
SM
2128 }
2129 $right = $kid;
2130 $left = "(" . join(", ", @exprs). ")";
2131 } else {
9d2c6865 2132 $left = $self->deparse_binop_left($op, $left, $prec);
6e90668e 2133 }
9d2c6865
SM
2134 $right = $self->deparse_binop_right($op, $right, $prec);
2135 return $self->maybe_parens("$left x$eq $right", $cx, $prec);
6e90668e
SM
2136}
2137
2138sub range {
2139 my $self = shift;
9d2c6865 2140 my ($op, $cx, $type) = @_;
6e90668e
SM
2141 my $left = $op->first;
2142 my $right = $left->sibling;
9d2c6865
SM
2143 $left = $self->deparse($left, 9);
2144 $right = $self->deparse($right, 9);
2145 return $self->maybe_parens("$left $type $right", $cx, 9);
6e90668e
SM
2146}
2147
2148sub pp_flop {
2149 my $self = shift;
9d2c6865 2150 my($op, $cx) = @_;
6e90668e
SM
2151 my $flip = $op->first;
2152 my $type = ($flip->flags & OPf_SPECIAL) ? "..." : "..";
9d2c6865 2153 return $self->range($flip->first, $cx, $type);
6e90668e
SM
2154}
2155
2156# one-line while/until is handled in pp_leave
2157
2158sub logop {
2159 my $self = shift;
9d2c6865 2160 my ($op, $cx, $lowop, $lowprec, $highop, $highprec, $blockname) = @_;
6e90668e
SM
2161 my $left = $op->first;
2162 my $right = $op->first->sibling;
d989cdac 2163 if ($cx < 1 and is_scope($right) and $blockname
58cccf98
SM
2164 and $self->{'expand'} < 7)
2165 { # if ($a) {$b}
9d2c6865
SM
2166 $left = $self->deparse($left, 1);
2167 $right = $self->deparse($right, 0);
2168 return "$blockname ($left) {\n\t$right\n\b}\cK";
d989cdac 2169 } elsif ($cx < 1 and $blockname and not $self->{'parens'}
58cccf98 2170 and $self->{'expand'} < 7) { # $b if $a
9d2c6865
SM
2171 $right = $self->deparse($right, 1);
2172 $left = $self->deparse($left, 1);
2173 return "$right $blockname $left";
2174 } elsif ($cx > $lowprec and $highop) { # $a && $b
2175 $left = $self->deparse_binop_left($op, $left, $highprec);
2176 $right = $self->deparse_binop_right($op, $right, $highprec);
2177 return $self->maybe_parens("$left $highop $right", $cx, $highprec);
2178 } else { # $a and $b
2179 $left = $self->deparse_binop_left($op, $left, $lowprec);
2180 $right = $self->deparse_binop_right($op, $right, $lowprec);
d989cdac 2181 return $self->maybe_parens("$left $lowop $right", $cx, $lowprec);
9d2c6865
SM
2182 }
2183}
2184
2185sub pp_and { logop(@_, "and", 3, "&&", 11, "if") }
f4a44678 2186sub pp_or { logop(@_, "or", 2, "||", 10, "unless") }
c963b151 2187sub pp_dor { logop(@_, "err", 2, "//", 10, "") }
3ed82cfc
GS
2188
2189# xor is syntactically a logop, but it's really a binop (contrary to
2190# old versions of opcode.pl). Syntax is what matters here.
9d2c6865 2191sub pp_xor { logop(@_, "xor", 2, "", 0, "") }
6e90668e
SM
2192
2193sub logassignop {
2194 my $self = shift;
9d2c6865 2195 my ($op, $cx, $opname) = @_;
6e90668e
SM
2196 my $left = $op->first;
2197 my $right = $op->first->sibling->first; # skip sassign
9d2c6865
SM
2198 $left = $self->deparse($left, 7);
2199 $right = $self->deparse($right, 7);
2200 return $self->maybe_parens("$left $opname $right", $cx, 7);
a798dbf2
MB
2201}
2202
6e90668e 2203sub pp_andassign { logassignop(@_, "&&=") }
c963b151
BD
2204sub pp_orassign { logassignop(@_, "||=") }
2205sub pp_dorassign { logassignop(@_, "//=") }
6e90668e
SM
2206
2207sub listop {
2208 my $self = shift;
9d2c6865
SM
2209 my($op, $cx, $name) = @_;
2210 my(@exprs);
2211 my $parens = ($cx >= 5) || $self->{'parens'};
2212 my $kid = $op->first->sibling;
2213 return $name if null $kid;
e31885a0 2214 my $first;
fb725297 2215 $name = "socketpair" if $name eq "sockpair";
b72c97e8
RGS
2216 my $proto = prototype("CORE::$name");
2217 if (defined $proto
2218 && $proto =~ /^;?\*/
e31885a0
RH
2219 && $kid->name eq "rv2gv") {
2220 $first = $self->deparse($kid->first, 6);
2221 }
2222 else {
2223 $first = $self->deparse($kid, 6);
2224 }
e99ebc55 2225 if ($name eq "chmod" && $first =~ /^\d+$/) {
a0035eb8 2226 $first = sprintf("%#o", $first);
e99ebc55 2227 }
9d2c6865
SM
2228 $first = "+$first" if not $parens and substr($first, 0, 1) eq "(";
2229 push @exprs, $first;
2230 $kid = $kid->sibling;
e1f56625 2231 if (defined $proto && $proto =~ /^\*\*/ && $kid->name eq "rv2gv") {
b72c97e8
RGS
2232 push @exprs, $self->deparse($kid->first, 6);
2233 $kid = $kid->sibling;
2234 }
9d2c6865
SM
2235 for (; !null($kid); $kid = $kid->sibling) {
2236 push @exprs, $self->deparse($kid, 6);
2237 }
2238 if ($parens) {
2239 return "$name(" . join(", ", @exprs) . ")";
2240 } else {
2241 return "$name " . join(", ", @exprs);
6e90668e 2242 }
6e90668e 2243}
a798dbf2 2244
6e90668e 2245sub pp_bless { listop(@_, "bless") }
3ed82cfc 2246sub pp_atan2 { maybe_targmy(@_, \&listop, "atan2") }
6e90668e
SM
2247sub pp_substr { maybe_local(@_, listop(@_, "substr")) }
2248sub pp_vec { maybe_local(@_, listop(@_, "vec")) }
3ed82cfc
GS
2249sub pp_index { maybe_targmy(@_, \&listop, "index") }
2250sub pp_rindex { maybe_targmy(@_, \&listop, "rindex") }
2251sub pp_sprintf { maybe_targmy(@_, \&listop, "sprintf") }
6e90668e 2252sub pp_formline { listop(@_, "formline") } # see also deparse_format
3ed82cfc 2253sub pp_crypt { maybe_targmy(@_, \&listop, "crypt") }
6e90668e
SM
2254sub pp_unpack { listop(@_, "unpack") }
2255sub pp_pack { listop(@_, "pack") }
3ed82cfc 2256sub pp_join { maybe_targmy(@_, \&listop, "join") }
6e90668e 2257sub pp_splice { listop(@_, "splice") }
3ed82cfc
GS
2258sub pp_push { maybe_targmy(@_, \&listop, "push") }
2259sub pp_unshift { maybe_targmy(@_, \&listop, "unshift") }
6e90668e
SM
2260sub pp_reverse { listop(@_, "reverse") }
2261sub pp_warn { listop(@_, "warn") }
2262sub pp_die { listop(@_, "die") }
9d2c6865
SM
2263# Actually, return is exempt from the LLAFR (see examples in this very
2264# module!), but for consistency's sake, ignore that fact
6e90668e
SM
2265sub pp_return { listop(@_, "return") }
2266sub pp_open { listop(@_, "open") }
2267sub pp_pipe_op { listop(@_, "pipe") }
2268sub pp_tie { listop(@_, "tie") }
82bafd27 2269sub pp_binmode { listop(@_, "binmode") }
6e90668e
SM
2270sub pp_dbmopen { listop(@_, "dbmopen") }
2271sub pp_sselect { listop(@_, "select") }
2272sub pp_select { listop(@_, "select") }
2273sub pp_read { listop(@_, "read") }
2274sub pp_sysopen { listop(@_, "sysopen") }
2275sub pp_sysseek { listop(@_, "sysseek") }
2276sub pp_sysread { listop(@_, "sysread") }
2277sub pp_syswrite { listop(@_, "syswrite") }
2278sub pp_send { listop(@_, "send") }
2279sub pp_recv { listop(@_, "recv") }
2280sub pp_seek { listop(@_, "seek") }
6e90668e
SM
2281sub pp_fcntl { listop(@_, "fcntl") }
2282sub pp_ioctl { listop(@_, "ioctl") }
3ed82cfc 2283sub pp_flock { maybe_targmy(@_, \&listop, "flock") }
6e90668e
SM
2284sub pp_socket { listop(@_, "socket") }
2285sub pp_sockpair { listop(@_, "sockpair") }
2286sub pp_bind { listop(@_, "bind") }
2287sub pp_connect { listop(@_, "connect") }
2288sub pp_listen { listop(@_, "listen") }
2289sub pp_accept { listop(@_, "accept") }
2290sub pp_shutdown { listop(@_, "shutdown") }
2291sub pp_gsockopt { listop(@_, "getsockopt") }
2292sub pp_ssockopt { listop(@_, "setsockopt") }
3ed82cfc
GS
2293sub pp_chown { maybe_targmy(@_, \&listop, "chown") }
2294sub pp_unlink { maybe_targmy(@_, \&listop, "unlink") }
2295sub pp_chmod { maybe_targmy(@_, \&listop, "chmod") }
2296sub pp_utime { maybe_targmy(@_, \&listop, "utime") }
2297sub pp_rename { maybe_targmy(@_, \&listop, "rename") }
2298sub pp_link { maybe_targmy(@_, \&listop, "link") }
2299sub pp_symlink { maybe_targmy(@_, \&listop, "symlink") }
2300sub pp_mkdir { maybe_targmy(@_, \&listop, "mkdir") }
6e90668e
SM
2301sub pp_open_dir { listop(@_, "opendir") }
2302sub pp_seekdir { listop(@_, "seekdir") }
3ed82cfc
GS
2303sub pp_waitpid { maybe_targmy(@_, \&listop, "waitpid") }
2304sub pp_system { maybe_targmy(@_, \&listop, "system") }
2305sub pp_exec { maybe_targmy(@_, \&listop, "exec") }
2306sub pp_kill { maybe_targmy(@_, \&listop, "kill") }
2307sub pp_setpgrp { maybe_targmy(@_, \&listop, "setpgrp") }
2308sub pp_getpriority { maybe_targmy(@_, \&listop, "getpriority") }
2309sub pp_setpriority { maybe_targmy(@_, \&listop, "setpriority") }
6e90668e
SM
2310sub pp_shmget { listop(@_, "shmget") }
2311sub pp_shmctl { listop(@_, "shmctl") }
2312sub pp_shmread { listop(@_, "shmread") }
2313sub pp_shmwrite { listop(@_, "shmwrite") }
2314sub pp_msgget { listop(@_, "msgget") }
2315sub pp_msgctl { listop(@_, "msgctl") }
2316sub pp_msgsnd { listop(@_, "msgsnd") }
2317sub pp_msgrcv { listop(@_, "msgrcv") }
2318sub pp_semget { listop(@_, "semget") }
2319sub pp_semctl { listop(@_, "semctl") }
2320sub pp_semop { listop(@_, "semop") }
2321sub pp_ghbyaddr { listop(@_, "gethostbyaddr") }
2322sub pp_gnbyaddr { listop(@_, "getnetbyaddr") }
2323sub pp_gpbynumber { listop(@_, "getprotobynumber") }
2324sub pp_gsbyname { listop(@_, "getservbyname") }
2325sub pp_gsbyport { listop(@_, "getservbyport") }
2326sub pp_syscall { listop(@_, "syscall") }
2327
2328sub pp_glob {
2329 my $self = shift;
9d2c6865 2330 my($op, $cx) = @_;
6e90668e
SM
2331 my $text = $self->dq($op->first->sibling); # skip pushmark
2332 if ($text =~ /^\$?(\w|::|\`)+$/ # could look like a readline
d989cdac 2333 or $text =~ /[<>]/) {
6e90668e
SM
2334 return 'glob(' . single_delim('qq', '"', $text) . ')';
2335 } else {
2336 return '<' . $text . '>';
2337 }
2338}
2339
f5aa8f4e
SM
2340# Truncate is special because OPf_SPECIAL makes a bareword first arg
2341# be a filehandle. This could probably be better fixed in the core
2342# by moving the GV lookup into ck_truc.
2343
2344sub pp_truncate {
2345 my $self = shift;
2346 my($op, $cx) = @_;
2347 my(@exprs);
2348 my $parens = ($cx >= 5) || $self->{'parens'};
2349 my $kid = $op->first->sibling;
acba1d67 2350 my $fh;
f5aa8f4e
SM
2351 if ($op->flags & OPf_SPECIAL) {
2352 # $kid is an OP_CONST
18228111 2353 $fh = $self->const_sv($kid)->PV;
f5aa8f4e
SM
2354 } else {
2355 $fh = $self->deparse($kid, 6);
2356 $fh = "+$fh" if not $parens and substr($fh, 0, 1) eq "(";
2357 }
2358 my $len = $self->deparse($kid->sibling, 6);
2359 if ($parens) {
2360 return "truncate($fh, $len)";
2361 } else {
2362 return "truncate $fh, $len";
2363 }
f5aa8f4e
SM
2364}
2365
6e90668e
SM
2366sub indirop {
2367 my $self = shift;
9d2c6865 2368 my($op, $cx, $name) = @_;
6e90668e
SM
2369 my($expr, @exprs);
2370 my $kid = $op->first->sibling;
2371 my $indir = "";
2372 if ($op->flags & OPf_STACKED) {
2373 $indir = $kid;
2374 $indir = $indir->first; # skip rv2gv
2375 if (is_scope($indir)) {
9d2c6865 2376 $indir = "{" . $self->deparse($indir, 0) . "}";
d989cdac 2377 $indir = "{;}" if $indir eq "{}";
c73811ab
RH
2378 } elsif ($indir->name eq "const" && $indir->private & OPpCONST_BARE) {
2379 $indir = $self->const_sv($indir)->PV;
6e90668e 2380 } else {
9d2c6865 2381 $indir = $self->deparse($indir, 24);
6e90668e
SM
2382 }
2383 $indir = $indir . " ";
2384 $kid = $kid->sibling;
2385 }
7e80da18 2386 if ($name eq "sort" && $op->private & (OPpSORT_NUMERIC | OPpSORT_INTEGER)) {
3ac6e0f9 2387 $indir = ($op->private & OPpSORT_DESCEND) ? '{$b <=> $a} '
7e80da18
RH
2388 : '{$a <=> $b} ';
2389 }
3ac6e0f9 2390 elsif ($name eq "sort" && $op->private & OPpSORT_DESCEND) {
7e80da18
RH
2391 $indir = '{$b cmp $a} ';
2392 }
6e90668e 2393 for (; !null($kid); $kid = $kid->sibling) {
9d2c6865 2394 $expr = $self->deparse($kid, 6);
6e90668e
SM
2395 push @exprs, $expr;
2396 }
3ac6e0f9
RGS
2397 my $name2 = $name;
2398 if ($name eq "sort" && $op->private & OPpSORT_REVERSE) {
2399 $name2 = 'reverse sort';
2400 }
2b6e98cb 2401 if ($name eq "sort" && ($op->private & OPpSORT_INPLACE)) {
3ac6e0f9 2402 return "$exprs[0] = $name2 $indir $exprs[0]";
2b6e98cb
DM
2403 }
2404
d989cdac
SM
2405 my $args = $indir . join(", ", @exprs);
2406 if ($indir ne "" and $name eq "sort") {
2407 # We don't want to say "sort(f 1, 2, 3)", since perl -w will
2408 # give bareword warnings in that case. Therefore if context
2409 # requires, we'll put parens around the outside "(sort f 1, 2,
2410 # 3)". Unfortunately, we'll currently think the parens are
3c4b39be 2411 # necessary more often that they really are, because we don't
d989cdac
SM
2412 # distinguish which side of an assignment we're on.
2413 if ($cx >= 5) {
3ac6e0f9 2414 return "($name2 $args)";
d989cdac 2415 } else {
3ac6e0f9 2416 return "$name2 $args";
d989cdac
SM
2417 }
2418 } else {
3ac6e0f9 2419 return $self->maybe_parens_func($name2, $args, $cx, 5);
d989cdac
SM
2420 }
2421
6e90668e
SM
2422}
2423
2424sub pp_prtf { indirop(@_, "printf") }
2425sub pp_print { indirop(@_, "print") }
2426sub pp_sort { indirop(@_, "sort") }
2427
2428sub mapop {
2429 my $self = shift;
9d2c6865 2430 my($op, $cx, $name) = @_;
6e90668e
SM
2431 my($expr, @exprs);
2432 my $kid = $op->first; # this is the (map|grep)start
2433 $kid = $kid->first->sibling; # skip a pushmark
2434 my $code = $kid->first; # skip a null
2435 if (is_scope $code) {
f4a44678 2436 $code = "{" . $self->deparse($code, 0) . "} ";
6e90668e 2437 } else {
9d2c6865 2438 $code = $self->deparse($code, 24) . ", ";
6e90668e
SM
2439 }
2440 $kid = $kid->sibling;
2441 for (; !null($kid); $kid = $kid->sibling) {
9d2c6865 2442 $expr = $self->deparse($kid, 6);
9a58b761 2443 push @exprs, $expr if defined $expr;
6e90668e 2444 }
9d2c6865 2445 return $self->maybe_parens_func($name, $code . join(", ", @exprs), $cx, 5);
6e90668e
SM
2446}
2447
d989cdac
SM
2448sub pp_mapwhile { mapop(@_, "map") }
2449sub pp_grepwhile { mapop(@_, "grep") }
11e09183
SP
2450sub pp_mapstart { baseop(@_, "map") }
2451sub pp_grepstart { baseop(@_, "grep") }
6e90668e
SM
2452
2453sub pp_list {
2454 my $self = shift;
9d2c6865 2455 my($op, $cx) = @_;
6e90668e
SM
2456 my($expr, @exprs);
2457 my $kid = $op->first->sibling; # skip pushmark
2458 my $lop;
3462b4ac 2459 my $local = "either"; # could be local(...), my(...), state(...) or our(...)
6e90668e
SM
2460 for ($lop = $kid; !null($lop); $lop = $lop->sibling) {
2461 # This assumes that no other private flags equal 128, and that
2462 # OPs that store things other than flags in their op_private,
2463 # like OP_AELEMFAST, won't be immediate children of a list.
b8e103fc
RH
2464 #
2465 # OP_ENTERSUB can break this logic, so check for it.
2466 # I suspect that open and exit can too.
2467
2468 if (!($lop->private & (OPpLVAL_INTRO|OPpOUR_INTRO)
ce4e655d 2469 or $lop->name eq "undef")
b8e103fc
RH
2470 or $lop->name eq "entersub"
2471 or $lop->name eq "exit"
2472 or $lop->name eq "open")
6e90668e
SM
2473 {
2474 $local = ""; # or not
2475 last;
2476 }
3462b4ac
RGS
2477 if ($lop->name =~ /^pad[ash]v$/) {
2478 if ($lop->private & OPpPAD_STATE) { # state()
2479 ($local = "", last) if $local =~ /^(?:local|our|my)$/;
2480 $local = "state";
2481 } else { # my()
2482 ($local = "", last) if $local =~ /^(?:local|our|state)$/;
2483 $local = "my";
2484 }
b8e103fc
RH
2485 } elsif ($lop->name =~ /^(gv|rv2)[ash]v$/
2486 && $lop->private & OPpOUR_INTRO
2487 or $lop->name eq "null" && $lop->first->name eq "gvsv"
2488 && $lop->first->private & OPpOUR_INTRO) { # our()
3462b4ac 2489 ($local = "", last) if $local =~ /^(?:my|local|state)$/;
ce4e655d 2490 $local = "our";
3ac6e0f9
RGS
2491 } elsif ($lop->name ne "undef"
2492 # specifically avoid the "reverse sort" optimisation,
2493 # where "reverse" is nullified
36d57d93 2494 && !($lop->name eq 'sort' && ($lop->flags & OPpSORT_REVERSE)))
3ac6e0f9
RGS
2495 {
2496 # local()
3462b4ac 2497 ($local = "", last) if $local =~ /^(?:my|our|state)$/;
6e90668e
SM
2498 $local = "local";
2499 }
2500 }
2501 $local = "" if $local eq "either"; # no point if it's all undefs
f5aa8f4e 2502 return $self->deparse($kid, $cx) if null $kid->sibling and not $local;
6e90668e
SM
2503 for (; !null($kid); $kid = $kid->sibling) {
2504 if ($local) {
3f872cb9 2505 if (class($kid) eq "UNOP" and $kid->first->name eq "gvsv") {
6e90668e
SM
2506 $lop = $kid->first;
2507 } else {
2508 $lop = $kid;
2509 }
2510 $self->{'avoid_local'}{$$lop}++;
9d2c6865 2511 $expr = $self->deparse($kid, 6);
6e90668e
SM
2512 delete $self->{'avoid_local'}{$$lop};
2513 } else {
9d2c6865 2514 $expr = $self->deparse($kid, 6);
6e90668e
SM
2515 }
2516 push @exprs, $expr;
2517 }
9d2c6865
SM
2518 if ($local) {
2519 return "$local(" . join(", ", @exprs) . ")";
2520 } else {
2521 return $self->maybe_parens( join(", ", @exprs), $cx, 6);
2522 }
6e90668e
SM
2523}
2524
6f611a1a
GS
2525sub is_ifelse_cont {
2526 my $op = shift;
2527 return ($op->name eq "null" and class($op) eq "UNOP"
2528 and $op->first->name =~ /^(and|cond_expr)$/
2529 and is_scope($op->first->first->sibling));
2530}
2531
6e90668e
SM
2532sub pp_cond_expr {
2533 my $self = shift;
9d2c6865 2534 my($op, $cx) = @_;
6e90668e
SM
2535 my $cond = $op->first;
2536 my $true = $cond->sibling;
2537 my $false = $true->sibling;
9d2c6865 2538 my $cuddle = $self->{'cuddle'};
d989cdac 2539 unless ($cx < 1 and (is_scope($true) and $true->name ne "null") and
58cccf98
SM
2540 (is_scope($false) || is_ifelse_cont($false))
2541 and $self->{'expand'} < 7) {
f5aa8f4e 2542 $cond = $self->deparse($cond, 8);
cfaba469 2543 $true = $self->deparse($true, 6);
9d2c6865
SM
2544 $false = $self->deparse($false, 8);
2545 return $self->maybe_parens("$cond ? $true : $false", $cx, 8);
6f611a1a
GS
2546 }
2547
f5aa8f4e 2548 $cond = $self->deparse($cond, 1);
d989cdac 2549 $true = $self->deparse($true, 0);
6f611a1a
GS
2550 my $head = "if ($cond) {\n\t$true\n\b}";
2551 my @elsifs;
2552 while (!null($false) and is_ifelse_cont($false)) {
2553 my $newop = $false->first;
2554 my $newcond = $newop->first;
2555 my $newtrue = $newcond->sibling;
2556 $false = $newtrue->sibling; # last in chain is OP_AND => no else
2557 $newcond = $self->deparse($newcond, 1);
2558 $newtrue = $self->deparse($newtrue, 0);
2559 push @elsifs, "elsif ($newcond) {\n\t$newtrue\n\b}";
2560 }
d989cdac 2561 if (!null($false)) {
6f611a1a
GS
2562 $false = $cuddle . "else {\n\t" .
2563 $self->deparse($false, 0) . "\n\b}\cK";
2564 } else {
2565 $false = "\cK";
6e90668e 2566 }
d989cdac 2567 return $head . join($cuddle, "", @elsifs) . $false;
6e90668e
SM
2568}
2569
58cccf98 2570sub loop_common {
6e90668e 2571 my $self = shift;
58cccf98 2572 my($op, $cx, $init) = @_;
6e90668e
SM
2573 my $enter = $op->first;
2574 my $kid = $enter->sibling;
a0405c92
RH
2575 local(@$self{qw'curstash warnings hints'})
2576 = @$self{qw'curstash warnings hints'};
6e90668e 2577 my $head = "";
9d2c6865 2578 my $bare = 0;
58cccf98
SM
2579 my $body;
2580 my $cond = undef;
d989cdac 2581 if ($kid->name eq "lineseq") { # bare or infinite loop
241416b8 2582 if ($kid->last->name eq "unstack") { # infinite
e99ebc55 2583 $head = "while (1) "; # Can't use for(;;) if there's a continue
58cccf98 2584 $cond = "";
9d2c6865
SM
2585 } else {
2586 $bare = 1;
6e90668e 2587 }
58cccf98 2588 $body = $kid;
3f872cb9 2589 } elsif ($enter->name eq "enteriter") { # foreach
6e90668e
SM
2590 my $ary = $enter->first->sibling; # first was pushmark
2591 my $var = $ary->sibling;
36d57d93
RGS
2592 if ($ary->name eq 'null' and $enter->private & OPpITER_REVERSED) {
2593 # "reverse" was optimised away
aae53c41 2594 $ary = listop($self, $ary->first->sibling, 1, 'reverse');
36d57d93 2595 } elsif ($enter->flags & OPf_STACKED
f5aa8f4e
SM
2596 and not null $ary->first->sibling->sibling)
2597 {
d7f5b6da
SM
2598 $ary = $self->deparse($ary->first->sibling, 9) . " .. " .
2599 $self->deparse($ary->first->sibling->sibling, 9);
d8d95777
GA
2600 } else {
2601 $ary = $self->deparse($ary, 1);
2602 }
6e90668e 2603 if (null $var) {
f6f9bdb7 2604 if ($enter->flags & OPf_SPECIAL) { # thread special var
9d2c6865 2605 $var = $self->pp_threadsv($enter, 1);
f6f9bdb7 2606 } else { # regular my() variable
9d2c6865 2607 $var = $self->pp_padsv($enter, 1);
6e90668e 2608 }
3f872cb9 2609 } elsif ($var->name eq "rv2gv") {
9d2c6865 2610 $var = $self->pp_rv2sv($var, 1);
241416b8
DM
2611 if ($enter->private & OPpOUR_INTRO) {
2612 # our declarations don't have package names
2613 $var =~ s/^(.).*::/$1/;
2614 $var = "our $var";
2615 }
3f872cb9 2616 } elsif ($var->name eq "gv") {
9d2c6865 2617 $var = "\$" . $self->deparse($var, 1);
6e90668e 2618 }
58cccf98 2619 $body = $kid->first->first->sibling; # skip OP_AND and OP_ITER
cf24a840
SM
2620 if (!is_state $body->first and $body->first->name ne "stub") {
2621 confess unless $var eq '$_';
2622 $body = $body->first;
2623 return $self->deparse($body, 2) . " foreach ($ary)";
2624 }
2625 $head = "foreach $var ($ary) ";
3f872cb9 2626 } elsif ($kid->name eq "null") { # while/until
6e90668e 2627 $kid = $kid->first;
58cccf98
SM
2628 my $name = {"and" => "while", "or" => "until"}->{$kid->name};
2629 $cond = $self->deparse($kid->first, 1);
2630 $head = "$name ($cond) ";
2631 $body = $kid->first->sibling;
3f872cb9 2632 } elsif ($kid->name eq "stub") { # bare and empty
9d2c6865 2633 return "{;}"; # {} could be a hashref
6e90668e 2634 }
58cccf98 2635 # If there isn't a continue block, then the next pointer for the loop
241416b8 2636 # will point to the unstack, which is kid's last child, except
58cccf98 2637 # in a bare loop, when it will point to the leaveloop. When neither of
241416b8 2638 # these conditions hold, then the second-to-last child is the continue
58cccf98
SM
2639 # block (or the last in a bare loop).
2640 my $cont_start = $enter->nextop;
2641 my $cont;
241416b8 2642 if ($$cont_start != $$op && ${$cont_start} != ${$body->last}) {
58cccf98
SM
2643 if ($bare) {
2644 $cont = $body->last;
2645 } else {
2646 $cont = $body->first;
241416b8 2647 while (!null($cont->sibling->sibling)) {
58cccf98
SM
2648 $cont = $cont->sibling;
2649 }
2650 }
2651 my $state = $body->first;
2652 my $cuddle = $self->{'cuddle'};
2653 my @states;
2654 for (; $$state != $$cont; $state = $state->sibling) {
2655 push @states, $state;
2656 }
ce4e655d 2657 $body = $self->lineseq(undef, @states);
58cccf98
SM
2658 if (defined $cond and not is_scope $cont and $self->{'expand'} < 3) {
2659 $head = "for ($init; $cond; " . $self->deparse($cont, 1) .") ";
2660 $cont = "\cK";
2661 } else {
2662 $cont = $cuddle . "continue {\n\t" .
2663 $self->deparse($cont, 0) . "\n\b}\cK";
6e90668e 2664 }
6e90668e 2665 } else {
7a9b44b9 2666 return "" if !defined $body;
c73811ab
RH
2667 if (length $init) {
2668 $head = "for ($init; $cond;) ";
2669 }
9d2c6865 2670 $cont = "\cK";
58cccf98 2671 $body = $self->deparse($body, 0);
6e90668e 2672 }
ce4e655d 2673 $body =~ s/;?$/;\n/;
34a48b4b
RH
2674
2675 return $head . "{\n\t" . $body . "\b}" . $cont;
58cccf98
SM
2676}
2677
2678sub pp_leaveloop { loop_common(@_, "") }
2679
2680sub for_loop {
2681 my $self = shift;
2682 my($op, $cx) = @_;
2683 my $init = $self->deparse($op, 1);
c73811ab 2684 return $self->loop_common($op->sibling->first->sibling, $cx, $init);
6e90668e
SM
2685}
2686
2687sub pp_leavetry {
2688 my $self = shift;
9d2c6865 2689 return "eval {\n\t" . $self->pp_leave(@_) . "\n\b}";
bd0865ec 2690}
6e90668e 2691
bd0865ec
GS
2692BEGIN { eval "sub OP_CONST () {" . opnumber("const") . "}" }
2693BEGIN { eval "sub OP_STRINGIFY () {" . opnumber("stringify") . "}" }
a9760014 2694BEGIN { eval "sub OP_RV2SV () {" . opnumber("rv2sv") . "}" }
90c0eb26 2695BEGIN { eval "sub OP_LIST () {" . opnumber("list") . "}" }
f5aa8f4e 2696
a798dbf2 2697sub pp_null {
6e90668e 2698 my $self = shift;
d989cdac 2699 my($op, $cx) = @_;
6e90668e 2700 if (class($op) eq "OP") {
f4a44678
SM
2701 # old value is lost
2702 return $self->{'ex_const'} if $op->targ == OP_CONST;
3f872cb9 2703 } elsif ($op->first->name eq "pushmark") {
9d2c6865 2704 return $self->pp_list($op, $cx);
3f872cb9 2705 } elsif ($op->first->name eq "enter") {
9d2c6865 2706 return $self->pp_leave($op, $cx);
31c6271a
RD
2707 } elsif ($op->first->name eq "leave") {
2708 return $self->pp_leave($op->first, $cx);
2709 } elsif ($op->first->name eq "scope") {
2710 return $self->pp_scope($op->first, $cx);
bd0865ec 2711 } elsif ($op->targ == OP_STRINGIFY) {
6f611a1a 2712 return $self->dquote($op, $cx);
6e90668e 2713 } elsif (!null($op->first->sibling) and
3f872cb9 2714 $op->first->sibling->name eq "readline" and
6e90668e 2715 $op->first->sibling->flags & OPf_STACKED) {
9d2c6865
SM
2716 return $self->maybe_parens($self->deparse($op->first, 7) . " = "
2717 . $self->deparse($op->first->sibling, 7),
2718 $cx, 7);
6e90668e 2719 } elsif (!null($op->first->sibling) and
3f872cb9 2720 $op->first->sibling->name eq "trans" and
6e90668e 2721 $op->first->sibling->flags & OPf_STACKED) {
9d2c6865
SM
2722 return $self->maybe_parens($self->deparse($op->first, 20) . " =~ "
2723 . $self->deparse($op->first->sibling, 20),
2724 $cx, 20);
d989cdac
SM
2725 } elsif ($op->flags & OPf_SPECIAL && $cx < 1 && !$op->targ) {
2726 return "do {\n\t". $self->deparse($op->first, $cx) ."\n\b};";
ad8caead
RGS
2727 } elsif (!null($op->first->sibling) and
2728 $op->first->sibling->name eq "null" and
2729 class($op->first->sibling) eq "UNOP" and
2730 $op->first->sibling->first->flags & OPf_STACKED and
2731 $op->first->sibling->first->name eq "rcatline") {
2732 return $self->maybe_parens($self->deparse($op->first, 18) . " .= "
2733 . $self->deparse($op->first->sibling, 18),
2734 $cx, 18);
6e90668e 2735 } else {
9d2c6865 2736 return $self->deparse($op->first, $cx);
6e90668e 2737 }
a798dbf2
MB
2738}
2739
6e90668e
SM
2740sub padname {
2741 my $self = shift;
2742 my $targ = shift;
68223ea3 2743 return $self->padname_sv($targ)->PVX;
6e90668e
SM
2744}
2745
2746sub padany {
2747 my $self = shift;
2748 my $op = shift;
2749 return substr($self->padname($op->targ), 1); # skip $/@/%
2750}
2751
2752sub pp_padsv {
2753 my $self = shift;
9d2c6865
SM
2754 my($op, $cx) = @_;
2755 return $self->maybe_my($op, $cx, $self->padname($op->targ));
6e90668e
SM
2756}
2757
2758sub pp_padav { pp_padsv(@_) }
2759sub pp_padhv { pp_padsv(@_) }
2760
9d2c6865
SM
2761my @threadsv_names;
2762
2763BEGIN {
2764 @threadsv_names = ("_", "1", "2", "3", "4", "5", "6", "7", "8", "9",
2765 "&", "`", "'", "+", "/", ".", ",", "\\", '"', ";",
2766 "^", "-", "%", "=", "|", "~", ":", "^A", "^E",
2767 "!", "@");
2768}
f6f9bdb7
SM
2769
2770sub pp_threadsv {
2771 my $self = shift;
9d2c6865
SM
2772 my($op, $cx) = @_;
2773 return $self->maybe_local($op, $cx, "\$" . $threadsv_names[$op->targ]);
d989cdac 2774}
f6f9bdb7 2775
6f611a1a 2776sub gv_or_padgv {
18228111
GS
2777 my $self = shift;
2778 my $op = shift;
6f611a1a
GS
2779 if (class($op) eq "PADOP") {
2780 return $self->padval($op->padix);
2781 } else { # class($op) eq "SVOP"
2782 return $op->gv;
18228111 2783 }
18228111
GS
2784}
2785
6e90668e
SM
2786sub pp_gvsv {
2787 my $self = shift;
9d2c6865 2788 my($op, $cx) = @_;
6f611a1a 2789 my $gv = $self->gv_or_padgv($op);
8510e997
RH
2790 return $self->maybe_local($op, $cx, $self->stash_variable("\$",
2791 $self->gv_name($gv)));
6e90668e
SM
2792}
2793
2794sub pp_gv {
2795 my $self = shift;
9d2c6865 2796 my($op, $cx) = @_;
6f611a1a 2797 my $gv = $self->gv_or_padgv($op);
18228111 2798 return $self->gv_name($gv);
6e90668e
SM
2799}
2800
2801sub pp_aelemfast {
2802 my $self = shift;
9d2c6865 2803 my($op, $cx) = @_;
6a077020
DM
2804 my $name;
2805 if ($op->flags & OPf_SPECIAL) { # optimised PADAV
2806 $name = $self->padname($op->targ);
2807 $name =~ s/^@/\$/;
2808 }
2809 else {
2810 my $gv = $self->gv_or_padgv($op);
2811 $name = $self->gv_name($gv);
2812 $name = $self->{'curstash'}."::$name"
2813 if $name !~ /::/ && $self->lex_in_scope('@'.$name);
2814 $name = '$' . $name;
2815 }
ce4e655d 2816
6a077020 2817 return $name . "[" . ($op->private + $self->{'arybase'}) . "]";
6e90668e
SM
2818}
2819
2820sub rv2x {
2821 my $self = shift;
9d2c6865 2822 my($op, $cx, $type) = @_;
90c0eb26
RH
2823
2824 if (class($op) eq 'NULL' || !$op->can("first")) {
ff97752d 2825 carp("Unexpected op in pp_rv2x");
90c0eb26
RH
2826 return 'XXX';
2827 }
6e90668e 2828 my $kid = $op->first;
d989cdac
SM
2829 if ($kid->name eq "gv") {
2830 return $self->stash_variable($type, $self->deparse($kid, 0));
2831 } elsif (is_scalar $kid) {
2832 my $str = $self->deparse($kid, 0);
2833 if ($str =~ /^\$([^\w\d])\z/) {
2834 # "$$+" isn't a legal way to write the scalar dereference
2835 # of $+, since the lexer can't tell you aren't trying to
2836 # do something like "$$ + 1" to get one more than your
2837 # PID. Either "${$+}" or "$${+}" are workable
2838 # disambiguations, but if the programmer did the former,
2839 # they'd be in the "else" clause below rather than here.
2840 # It's not clear if this should somehow be unified with
2841 # the code in dq and re_dq that also adds lexer
2842 # disambiguation braces.
2843 $str = '$' . "{$1}"; #'
2844 }
2845 return $type . $str;
2846 } else {
2847 return $type . "{" . $self->deparse($kid, 0) . "}";
2848 }
6e90668e
SM
2849}
2850
2851sub pp_rv2sv { maybe_local(@_, rv2x(@_, "\$")) }
2852sub pp_rv2hv { maybe_local(@_, rv2x(@_, "%")) }
2853sub pp_rv2gv { maybe_local(@_, rv2x(@_, "*")) }
2854
2855# skip rv2av
2856sub pp_av2arylen {
2857 my $self = shift;
9d2c6865 2858 my($op, $cx) = @_;
3f872cb9 2859 if ($op->first->name eq "padav") {
9d2c6865 2860 return $self->maybe_local($op, $cx, '$#' . $self->padany($op->first));
6e90668e 2861 } else {
f5aa8f4e
SM
2862 return $self->maybe_local($op, $cx,
2863 $self->rv2x($op->first, $cx, '$#'));
6e90668e
SM
2864 }
2865}
2866
2867# skip down to the old, ex-rv2cv
90c0eb26
RH
2868sub pp_rv2cv {
2869 my ($self, $op, $cx) = @_;
2870 if (!null($op->first) && $op->first->name eq 'null' &&
2871 $op->first->targ eq OP_LIST)
2872 {
2873 return $self->rv2x($op->first->first->sibling, $cx, "&")
2874 }
2875 else {
2876 return $self->rv2x($op, $cx, "")
2877 }
2878}
6e90668e 2879
d989cdac
SM
2880sub list_const {
2881 my $self = shift;
2882 my($cx, @list) = @_;
2883 my @a = map $self->const($_, 6), @list;
2884 if (@a == 0) {
2885 return "()";
2886 } elsif (@a == 1) {
2887 return $a[0];
2888 } elsif ( @a > 2 and !grep(!/^-?\d+$/, @a)) {
2889 # collapse (-1,0,1,2) into (-1..2)
2890 my ($s, $e) = @a[0,-1];
2891 my $i = $s;
2892 return $self->maybe_parens("$s..$e", $cx, 9)
2893 unless grep $i++ != $_, @a;
2894 }
2895 return $self->maybe_parens(join(", ", @a), $cx, 6);
2896}
2897
6e90668e
SM
2898sub pp_rv2av {
2899 my $self = shift;
9d2c6865 2900 my($op, $cx) = @_;
6e90668e 2901 my $kid = $op->first;
3f872cb9 2902 if ($kid->name eq "const") { # constant list
18228111 2903 my $av = $self->const_sv($kid);
d989cdac 2904 return $self->list_const($cx, $av->ARRAY);
6e90668e 2905 } else {
9d2c6865 2906 return $self->maybe_local($op, $cx, $self->rv2x($op, $cx, "\@"));
6e90668e
SM
2907 }
2908 }
2909
3ed82cfc
GS
2910sub is_subscriptable {
2911 my $op = shift;
2912 if ($op->name =~ /^[ahg]elem/) {
2913 return 1;
2914 } elsif ($op->name eq "entersub") {
2915 my $kid = $op->first;
2916 return 0 unless null $kid->sibling;
2917 $kid = $kid->first;
2918 $kid = $kid->sibling until null $kid->sibling;
2919 return 0 if is_scope($kid);
2920 $kid = $kid->first;
2921 return 0 if $kid->name eq "gv";
2922 return 0 if is_scalar($kid);
2923 return is_subscriptable($kid);
2924 } else {
2925 return 0;
2926 }
2927}
6e90668e 2928
21b7468a
BL
2929sub elem_or_slice_array_name
2930{
6e90668e 2931 my $self = shift;
21b7468a
BL
2932 my ($array, $left, $padname, $allow_arrow) = @_;
2933
3f872cb9 2934 if ($array->name eq $padname) {
21b7468a 2935 return $self->padany($array);
6e90668e 2936 } elsif (is_scope($array)) { # ${expr}[0]
21b7468a 2937 return "{" . $self->deparse($array, 0) . "}";
ce4e655d
RH
2938 } elsif ($array->name eq "gv") {
2939 $array = $self->gv_name($self->gv_or_padgv($array));
2940 if ($array !~ /::/) {
2941 my $prefix = ($left eq '[' ? '@' : '%');
2942 $array = $self->{curstash}.'::'.$array
2943 if $self->lex_in_scope($prefix . $array);
2944 }
21b7468a
BL
2945 return $array;
2946 } elsif (!$allow_arrow || is_scalar $array) { # $x[0], $$x[0], ...
2947 return $self->deparse($array, 24);
6e90668e 2948 } else {
21b7468a 2949 return undef;
6e90668e 2950 }
21b7468a
BL
2951}
2952
2953sub elem_or_slice_single_index
2954{
2955 my $self = shift;
2956 my ($idx) = @_;
2957
9d2c6865 2958 $idx = $self->deparse($idx, 1);
7a9b44b9
RH
2959
2960 # Outer parens in an array index will confuse perl
2961 # if we're interpolating in a regular expression, i.e.
2962 # /$x$foo[(-1)]/ is *not* the same as /$x$foo[-1]/
2963 #
2964 # If $self->{parens}, then an initial '(' will
2965 # definitely be paired with a final ')'. If
2966 # !$self->{parens}, the misleading parens won't
2967 # have been added in the first place.
2968 #
2969 # [You might think that we could get "(...)...(...)"
2970 # where the initial and final parens do not match
2971 # each other. But we can't, because the above would
2972 # only happen if there's an infix binop between the
2973 # two pairs of parens, and *that* means that the whole
2974 # expression would be parenthesized as well.]
2975 #
2976 $idx =~ s/^\((.*)\)$/$1/ if $self->{'parens'};
2977
098251bc
RH
2978 # Hash-element braces will autoquote a bareword inside themselves.
2979 # We need to make sure that C<$hash{warn()}> doesn't come out as
2980 # C<$hash{warn}>, which has a quite different meaning. Currently
2981 # B::Deparse will always quote strings, even if the string was a
2982 # bareword in the original (i.e. the OPpCONST_BARE flag is ignored
2983 # for constant strings.) So we can cheat slightly here - if we see
2984 # a bareword, we know that it is supposed to be a function call.
2985 #
2986 $idx =~ s/^([A-Za-z_]\w*)$/$1()/;
2987
21b7468a
BL
2988 return $idx;
2989}
2990
2991sub elem {
2992 my $self = shift;
2993 my ($op, $cx, $left, $right, $padname) = @_;
2994 my($array, $idx) = ($op->first, $op->first->sibling);
2995
2996 $idx = $self->elem_or_slice_single_index($idx);
2997
2998 unless ($array->name eq $padname) { # Maybe this has been fixed
2999 $array = $array->first; # skip rv2av (or ex-rv2av in _53+)
3000 }
3001 if (my $array_name=$self->elem_or_slice_array_name
3002 ($array, $left, $padname, 1)) {
3003 return "\$" . $array_name . $left . $idx . $right;
3004 } else {
3005 # $x[20][3]{hi} or expr->[20]
3006 my $arrow = is_subscriptable($array) ? "" : "->";
3007 return $self->deparse($array, 24) . $arrow . $left . $idx . $right;
3008 }
3009
6e90668e
SM
3010}
3011
3f872cb9
GS
3012sub pp_aelem { maybe_local(@_, elem(@_, "[", "]", "padav")) }
3013sub pp_helem { maybe_local(@_, elem(@_, "{", "}", "padhv")) }
6e90668e
SM
3014
3015sub pp_gelem {
3016 my $self = shift;
9d2c6865 3017 my($op, $cx) = @_;
6e90668e
SM
3018 my($glob, $part) = ($op->first, $op->last);
3019 $glob = $glob->first; # skip rv2gv
3f872cb9 3020 $glob = $glob->first if $glob->name eq "rv2gv"; # this one's a bug
9d2c6865
SM
3021 my $scope = is_scope($glob);
3022 $glob = $self->deparse($glob, 0);
3023 $part = $self->deparse($part, 1);
6e90668e
SM
3024 return "*" . ($scope ? "{$glob}" : $glob) . "{$part}";
3025}
3026
3027sub slice {
3028 my $self = shift;
9d2c6865 3029 my ($op, $cx, $left, $right, $regname, $padname) = @_;
6e90668e
SM
3030 my $last;
3031 my(@elems, $kid, $array, $list);
3032 if (class($op) eq "LISTOP") {
3033 $last = $op->last;
3034 } else { # ex-hslice inside delete()
3035 for ($kid = $op->first; !null $kid->sibling; $kid = $kid->sibling) {}
3036 $last = $kid;
3037 }
3038 $array = $last;
3039 $array = $array->first
3f872cb9 3040 if $array->name eq $regname or $array->name eq "null";
21b7468a 3041 $array = $self->elem_or_slice_array_name($array,$left,$padname,0);
6e90668e 3042 $kid = $op->first->sibling; # skip pushmark
3f872cb9 3043 if ($kid->name eq "list") {
6e90668e
SM
3044 $kid = $kid->first->sibling; # skip list, pushmark
3045 for (; !null $kid; $kid = $kid->sibling) {
9d2c6865 3046 push @elems, $self->deparse($kid, 6);
6e90668e
SM
3047 }
3048 $list = join(", ", @elems);
3049 } else {
21b7468a 3050 $list = $self->elem_or_slice_single_index($kid);
6e90668e
SM
3051 }
3052 return "\@" . $array . $left . $list . $right;
3053}
3054
3ed82cfc
GS
3055sub pp_aslice { maybe_local(@_, slice(@_, "[", "]", "rv2av", "padav")) }
3056sub pp_hslice { maybe_local(@_, slice(@_, "{", "}", "rv2hv", "padhv")) }
6e90668e
SM
3057
3058sub pp_lslice {
3059 my $self = shift;
9d2c6865 3060 my($op, $cx) = @_;
6e90668e
SM
3061 my $idx = $op->first;
3062 my $list = $op->last;
3063 my(@elems, $kid);
9d2c6865
SM
3064 $list = $self->deparse($list, 1);
3065 $idx = $self->deparse($idx, 1);
3066 return "($list)" . "[$idx]";
6e90668e
SM
3067}
3068
6e90668e
SM
3069sub want_scalar {
3070 my $op = shift;
3071 return ($op->flags & OPf_WANT) == OPf_WANT_SCALAR;
3072}
3073
bd0865ec
GS
3074sub want_list {
3075 my $op = shift;
3076 return ($op->flags & OPf_WANT) == OPf_WANT_LIST;
3077}
3078
3079sub method {
6e90668e 3080 my $self = shift;
9d2c6865 3081 my($op, $cx) = @_;
bd0865ec
GS
3082 my $kid = $op->first->sibling; # skip pushmark
3083 my($meth, $obj, @exprs);
3f872cb9 3084 if ($kid->name eq "list" and want_list $kid) {
bd0865ec
GS
3085 # When an indirect object isn't a bareword but the args are in
3086 # parens, the parens aren't part of the method syntax (the LLAFR
3087 # doesn't apply), but they make a list with OPf_PARENS set that
3088 # doesn't get flattened by the append_elem that adds the method,
3089 # making a (object, arg1, arg2, ...) list where the object
d989cdac 3090 # usually is. This can be distinguished from
bd0865ec
GS
3091 # `($obj, $arg1, $arg2)->meth()' (which is legal if $arg2 is an
3092 # object) because in the later the list is in scalar context
3093 # as the left side of -> always is, while in the former
3094 # the list is in list context as method arguments always are.
3095 # (Good thing there aren't method prototypes!)
3ed82cfc 3096 $meth = $kid->sibling;
bd0865ec
GS
3097 $kid = $kid->first->sibling; # skip pushmark
3098 $obj = $kid;
6e90668e 3099 $kid = $kid->sibling;
bd0865ec 3100 for (; not null $kid; $kid = $kid->sibling) {
9d2c6865 3101 push @exprs, $self->deparse($kid, 6);
6e90668e 3102 }
bd0865ec
GS
3103 } else {
3104 $obj = $kid;
3105 $kid = $kid->sibling;
90c0eb26
RH
3106 for (; !null ($kid->sibling) && $kid->name ne "method_named";
3107 $kid = $kid->sibling) {
bd0865ec 3108 push @exprs, $self->deparse($kid, 6);
6e90668e 3109 }
3ed82cfc 3110 $meth = $kid;
bd0865ec
GS
3111 }
3112 $obj = $self->deparse($obj, 24);
3ed82cfc 3113 if ($meth->name eq "method_named") {
18228111 3114 $meth = $self->const_sv($meth)->PV;
bd0865ec 3115 } else {
3ed82cfc
GS
3116 $meth = $meth->first;
3117 if ($meth->name eq "const") {
3118 # As of 5.005_58, this case is probably obsoleted by the
3119 # method_named case above
18228111 3120 $meth = $self->const_sv($meth)->PV; # needs to be bare
3ed82cfc
GS
3121 } else {
3122 $meth = $self->deparse($meth, 1);
3123 }
bd0865ec
GS
3124 }
3125 my $args = join(", ", @exprs);
3126 $kid = $obj . "->" . $meth;
145eb477 3127 if (length $args) {
bd0865ec
GS
3128 return $kid . "(" . $args . ")"; # parens mandatory
3129 } else {
3130 return $kid;
3131 }
3132}
3133
3134# returns "&" if the prototype doesn't match the args,
3135# or ("", $args_after_prototype_demunging) if it does.
3136sub check_proto {
3137 my $self = shift;
acaaef34 3138 return "&" if $self->{'noproto'};
bd0865ec
GS
3139 my($proto, @args) = @_;
3140 my($arg, $real);
3141 my $doneok = 0;
3142 my @reals;
3143 # An unbackslashed @ or % gobbles up the rest of the args
2ae48fff 3144 1 while $proto =~ s/(?<!\\)([@%])[^\]]+$/$1/;
bd0865ec 3145 while ($proto) {
2ae48fff 3146 $proto =~ s/^(\\?[\$\@&%*]|\\\[[\$\@&%*]+\]|;)//;
bd0865ec
GS
3147 my $chr = $1;
3148 if ($chr eq "") {
3149 return "&" if @args;
3150 } elsif ($chr eq ";") {
3151 $doneok = 1;
3152 } elsif ($chr eq "@" or $chr eq "%") {
3153 push @reals, map($self->deparse($_, 6), @args);
3154 @args = ();
6e90668e 3155 } else {
bd0865ec
GS
3156 $arg = shift @args;
3157 last unless $arg;
3158 if ($chr eq "\$") {
3159 if (want_scalar $arg) {
3160 push @reals, $self->deparse($arg, 6);
3161 } else {
3162 return "&";
3163 }
3164 } elsif ($chr eq "&") {
3f872cb9 3165 if ($arg->name =~ /^(s?refgen|undef)$/) {
bd0865ec
GS
3166 push @reals, $self->deparse($arg, 6);
3167 } else {
3168 return "&";
3169 }
3170 } elsif ($chr eq "*") {
3f872cb9
GS
3171 if ($arg->name =~ /^s?refgen$/
3172 and $arg->first->first->name eq "rv2gv")
bd0865ec
GS
3173 {
3174 $real = $arg->first->first; # skip refgen, null
3f872cb9 3175 if ($real->first->name eq "gv") {
bd0865ec
GS
3176 push @reals, $self->deparse($real, 6);
3177 } else {
3178 push @reals, $self->deparse($real->first, 6);
3179 }
3180 } else {
3181 return "&";
3182 }
3183 } elsif (substr($chr, 0, 1) eq "\\") {
2ae48fff 3184 $chr =~ tr/\\[]//d;
3f872cb9 3185 if ($arg->name =~ /^s?refgen$/ and
bd0865ec 3186 !null($real = $arg->first) and
2ae48fff
RGS
3187 ($chr =~ /\$/ && is_scalar($real->first)
3188 or ($chr =~ /@/
3189 && class($real->first->sibling) ne 'NULL'
3f872cb9
GS
3190 && $real->first->sibling->name
3191 =~ /^(rv2|pad)av$/)
2ae48fff
RGS
3192 or ($chr =~ /%/
3193 && class($real->first->sibling) ne 'NULL'
3f872cb9
GS
3194 && $real->first->sibling->name
3195 =~ /^(rv2|pad)hv$/)
2ae48fff 3196 #or ($chr =~ /&/ # This doesn't work
3f872cb9 3197 # && $real->first->name eq "rv2cv")
2ae48fff 3198 or ($chr =~ /\*/
3f872cb9 3199 && $real->first->name eq "rv2gv")))
bd0865ec
GS
3200 {
3201 push @reals, $self->deparse($real, 6);
3202 } else {
3203 return "&";
3204 }
3205 }
3206 }
9d2c6865 3207 }
bd0865ec
GS
3208 return "&" if $proto and !$doneok; # too few args and no `;'
3209 return "&" if @args; # too many args
3210 return ("", join ", ", @reals);
3211}
3212
3213sub pp_entersub {
3214 my $self = shift;
3215 my($op, $cx) = @_;
3216 return $self->method($op, $cx) unless null $op->first->sibling;
3217 my $prefix = "";
3218 my $amper = "";
3219 my($kid, @exprs);
90c0eb26 3220 if ($op->flags & OPf_SPECIAL && !($op->flags & OPf_MOD)) {
9d2c6865
SM
3221 $prefix = "do ";
3222 } elsif ($op->private & OPpENTERSUB_AMPER) {
3223 $amper = "&";
3224 }
3225 $kid = $op->first;
3226 $kid = $kid->first->sibling; # skip ex-list, pushmark
3227 for (; not null $kid->sibling; $kid = $kid->sibling) {
3228 push @exprs, $kid;
3229 }
bd0865ec
GS
3230 my $simple = 0;
3231 my $proto = undef;
9d2c6865
SM
3232 if (is_scope($kid)) {
3233 $amper = "&";
3234 $kid = "{" . $self->deparse($kid, 0) . "}";
3f872cb9 3235 } elsif ($kid->first->name eq "gv") {
6f611a1a 3236 my $gv = $self->gv_or_padgv($kid->first);
9d2c6865
SM
3237 if (class($gv->CV) ne "SPECIAL") {
3238 $proto = $gv->CV->PV if $gv->CV->FLAGS & SVf_POK;
3239 }
bd0865ec 3240 $simple = 1; # only calls of named functions can be prototyped
9d2c6865 3241 $kid = $self->deparse($kid, 24);
90c0eb26 3242 } elsif (is_scalar ($kid->first) && $kid->first->name ne 'rv2cv') {
9d2c6865
SM
3243 $amper = "&";
3244 $kid = $self->deparse($kid, 24);
3245 } else {
3246 $prefix = "";
3ed82cfc
GS
3247 my $arrow = is_subscriptable($kid->first) ? "" : "->";
3248 $kid = $self->deparse($kid, 24) . $arrow;
9d2c6865 3249 }
0ca62a8e
RH
3250
3251 # Doesn't matter how many prototypes there are, if
3252 # they haven't happened yet!
1d38190f
RGS
3253 my $declared;
3254 {
3255 no strict 'refs';
3256 no warnings 'uninitialized';
3257 $declared = exists $self->{'subs_declared'}{$kid}
d989cdac 3258 || (
840378f5 3259 defined &{ ${$self->{'curstash'}."::"}{$kid} }
1d38190f
RGS
3260 && !exists
3261 $self->{'subs_deparsed'}{$self->{'curstash'}."::".$kid}
3262 && defined prototype $self->{'curstash'}."::".$kid
3263 );
3264 if (!$declared && defined($proto)) {
3265 # Avoid "too early to check prototype" warning
3266 ($amper, $proto) = ('&');
3267 }
e99ebc55 3268 }
0ca62a8e 3269
bd0865ec 3270 my $args;
0ca62a8e 3271 if ($declared and defined $proto and not $amper) {
bd0865ec
GS
3272 ($amper, $args) = $self->check_proto($proto, @exprs);
3273 if ($amper eq "&") {
9d2c6865
SM
3274 $args = join(", ", map($self->deparse($_, 6), @exprs));
3275 }
3276 } else {
3277 $args = join(", ", map($self->deparse($_, 6), @exprs));
6e90668e 3278 }
9d2c6865
SM
3279 if ($prefix or $amper) {
3280 if ($op->flags & OPf_STACKED) {
3281 return $prefix . $amper . $kid . "(" . $args . ")";
3282 } else {
3283 return $prefix . $amper. $kid;
3284 }
6e90668e 3285 } else {
34a48b4b 3286 # glob() invocations can be translated into calls of
d1be9408 3287 # CORE::GLOBAL::glob with a second parameter, a number.
34a48b4b
RH
3288 # Reverse this.
3289 if ($kid eq "CORE::GLOBAL::glob") {
3290 $kid = "glob";
3291 $args =~ s/\s*,[^,]+$//;
3292 }
3293
3294 # It's a syntax error to call CORE::GLOBAL::foo without a prefix,
3295 # so it must have been translated from a keyword call. Translate
3296 # it back.
3297 $kid =~ s/^CORE::GLOBAL:://;
3298
d989cdac 3299 my $dproto = defined($proto) ? $proto : "undefined";
0ca62a8e
RH
3300 if (!$declared) {
3301 return "$kid(" . $args . ")";
d989cdac 3302 } elsif ($dproto eq "") {
9d2c6865 3303 return $kid;
d989cdac
SM
3304 } elsif ($dproto eq "\$" and is_scalar($exprs[0])) {
3305 # is_scalar is an excessively conservative test here:
3306 # really, we should be comparing to the precedence of the
3307 # top operator of $exprs[0] (ala unop()), but that would
3308 # take some major code restructuring to do right.
9d2c6865 3309 return $self->maybe_parens_func($kid, $args, $cx, 16);
d989cdac 3310 } elsif ($dproto ne '$' and defined($proto) || $simple) { #'
9d2c6865
SM
3311 return $self->maybe_parens_func($kid, $args, $cx, 5);
3312 } else {
3313 return "$kid(" . $args . ")";
3314 }
6e90668e
SM
3315 }
3316}
3317
3318sub pp_enterwrite { unop(@_, "write") }
3319
3320# escape things that cause interpolation in double quotes,
3321# but not character escapes
3322sub uninterp {
3323 my($str) = @_;
3f766ba3 3324 $str =~ s/(^|\G|[^\\])((?:\\\\)*)([\$\@]|\\[uUlLQE])/$1$2\\$3/g;
9d2c6865
SM
3325 return $str;
3326}
3327
b7dad2dc
RH
3328{
3329my $bal;
3330BEGIN {
cdf8218f
RH
3331 use re "eval";
3332 # Matches any string which is balanced with respect to {braces}
b7dad2dc 3333 $bal = qr(
cdf8218f
RH
3334 (?:
3335 [^\\{}]
3336 | \\\\
3337 | \\[{}]
3338 | \{(??{$bal})\}
3339 )*
3340 )x;
b7dad2dc
RH
3341}
3342
3343# the same, but treat $|, $), $( and $ at the end of the string differently
3344sub re_uninterp {
3345 my($str) = @_;
cdf8218f
RH
3346
3347 $str =~ s/
3348 ( ^|\G # $1
3349 | [^\\]
3350 )
3351
3352 ( # $2
3353 (?:\\\\)*
3354 )
3355
3356 ( # $3
3357 (\(\?\??\{$bal\}\)) # $4
3358 | [\$\@]
3359 (?!\||\)|\(|$)
3360 | \\[uUlLQE]
3361 )
3362
2621462b 3363 /defined($4) && length($4) ? "$1$2$4" : "$1$2\\$3"/xeg;
cdf8218f 3364
6e90668e
SM
3365 return $str;
3366}
3367
b7dad2dc
RH
3368# This is for regular expressions with the /x modifier
3369# We have to leave comments unmangled.
a9760014 3370sub re_uninterp_extended {
b7dad2dc
RH
3371 my($str) = @_;
3372
3373 $str =~ s/
3374 ( ^|\G # $1
3375 | [^\\]
3376 )
3377
3378 ( # $2
3379 (?:\\\\)*
3380 )
3381
3382 ( # $3
3383 ( \(\?\??\{$bal\}\) # $4 (skip over (?{}) and (??{}) blocks)
3384 | \#[^\n]* # (skip over comments)
3385 )
3386 | [\$\@]
9a58b761 3387 (?!\||\)|\(|$|\s)
b7dad2dc
RH
3388 | \\[uUlLQE]
3389 )
3390
c7de4c66 3391 /defined($4) && length($4) ? "$1$2$4" : "$1$2\\$3"/xeg;
b7dad2dc 3392
a9760014
RH
3393 return $str;
3394}
b7dad2dc 3395}
a9760014 3396
57aa3c4e
JH
3397my %unctrl = # portable to to EBCDIC
3398 (
3399 "\c@" => '\c@', # unused
3400 "\cA" => '\cA',
3401 "\cB" => '\cB',
3402 "\cC" => '\cC',
3403 "\cD" => '\cD',
3404 "\cE" => '\cE',
3405 "\cF" => '\cF',
3406 "\cG" => '\cG',
3407 "\cH" => '\cH',
3408 "\cI" => '\cI',
3409 "\cJ" => '\cJ',
3410 "\cK" => '\cK',
3411 "\cL" => '\cL',
3412 "\cM" => '\cM',
3413 "\cN" => '\cN',
3414 "\cO" => '\cO',
3415 "\cP" => '\cP',
3416 "\cQ" => '\cQ',
3417 "\cR" => '\cR',
3418 "\cS" => '\cS',
3419 "\cT" => '\cT',
3420 "\cU" => '\cU',
3421 "\cV" => '\cV',
3422 "\cW" => '\cW',
3423 "\cX" => '\cX',
3424 "\cY" => '\cY',
3425 "\cZ" => '\cZ',
3426 "\c[" => '\c[', # unused
3427 "\c\\" => '\c\\', # unused
3428 "\c]" => '\c]', # unused
3429 "\c_" => '\c_', # unused
3430 );
3431
6e90668e 3432# character escapes, but not delimiters that might need to be escaped
746698c5 3433sub escape_str { # ASCII, UTF8
6e90668e 3434 my($str) = @_;
cef22867 3435 $str =~ s/(.)/ord($1) > 255 ? sprintf("\\x{%x}", ord($1)) : $1/eg;
6e90668e 3436 $str =~ s/\a/\\a/g;
d989cdac 3437# $str =~ s/\cH/\\b/g; # \b means something different in a regex
6e90668e
SM
3438 $str =~ s/\t/\\t/g;
3439 $str =~ s/\n/\\n/g;
3440 $str =~ s/\e/\\e/g;
3441 $str =~ s/\f/\\f/g;
3442 $str =~ s/\r/\\r/g;
fc132725 3443 $str =~ s/([\cA-\cZ])/$unctrl{$1}/ge;
cef22867 3444 $str =~ s/([[:^print:]])/sprintf("\\%03o", ord($1))/ge;
6e90668e
SM
3445 return $str;
3446}
3447
b7dad2dc
RH
3448# For regexes with the /x modifier.
3449# Leave whitespace unmangled.
a9760014
RH
3450sub escape_extended_re {
3451 my($str) = @_;
cef22867 3452 $str =~ s/(.)/ord($1) > 255 ? sprintf("\\x{%x}", ord($1)) : $1/eg;
aee8fd8d
RGS
3453 $str =~ s/([[:^print:]])/
3454 ($1 =~ y! \t\n!!) ? $1 : sprintf("\\%03o", ord($1))/ge;
a9760014
RH
3455 $str =~ s/\n/\n\f/g;
3456 return $str;
3457}
3458
9d2c6865
SM
3459# Don't do this for regexen
3460sub unback {
3461 my($str) = @_;
3462 $str =~ s/\\/\\\\/g;
3463 return $str;
3464}
3465
08c6f5ec
RH
3466# Remove backslashes which precede literal control characters,
3467# to avoid creating ambiguity when we escape the latter.
3468sub re_unback {
3469 my($str) = @_;
3470
3471 # the insane complexity here is due to the behaviour of "\c\"
cef22867 3472 $str =~ s/(^|[^\\]|\\c\\)(?<!\\c)\\(\\\\)*(?=[[:^print:]])/$1$2/g;
08c6f5ec
RH
3473 return $str;
3474}
3475
6e90668e
SM
3476sub balanced_delim {
3477 my($str) = @_;
3478 my @str = split //, $str;
80b7d6d2 3479 my($ar, $open, $close, $fail, $c, $cnt, $last_bs);
6e90668e
SM
3480 for $ar (['[',']'], ['(',')'], ['<','>'], ['{','}']) {
3481 ($open, $close) = @$ar;
80b7d6d2 3482 $fail = 0; $cnt = 0; $last_bs = 0;
6e90668e
SM
3483 for $c (@str) {
3484 if ($c eq $open) {
80b7d6d2 3485 $fail = 1 if $last_bs;
6e90668e
SM
3486 $cnt++;
3487 } elsif ($c eq $close) {
80b7d6d2 3488 $fail = 1 if $last_bs;
6e90668e
SM
3489 $cnt--;
3490 if ($cnt < 0) {
bd0865ec 3491 # qq()() isn't ")("
6e90668e
SM
3492 $fail = 1;
3493 last;
3494 }
3495 }
80b7d6d2 3496 $last_bs = $c eq '\\';
6e90668e
SM
3497 }
3498 $fail = 1 if $cnt != 0;
3499 return ($open, "$open$str$close") if not $fail;
3500 }
3501 return ("", $str);
3502}
3503
3504sub single_delim {
3505 my($q, $default, $str) = @_;
90be192f 3506 return "$default$str$default" if $default and index($str, $default) == -1;
8347ad86
RGS
3507 if ($q ne 'qr') {
3508 (my $succeed, $str) = balanced_delim($str);
3509 return "$q$str" if $succeed;
3510 }
3511 for my $delim ('/', '"', '#') {
6e90668e
SM
3512 return "$q$delim" . $str . $delim if index($str, $delim) == -1;
3513 }
90be192f
SM
3514 if ($default) {
3515 $str =~ s/$default/\\$default/g;
3516 return "$default$str$default";
3517 } else {
3518 $str =~ s[/][\\/]g;
3519 return "$q/$str/";
3520 }
6e90668e
SM
3521}
3522
d989cdac
SM
3523my $max_prec;
3524BEGIN { $max_prec = int(0.999 + 8*length(pack("F", 42))*log(2)/log(10)); }
3525
3526# Split a floating point number into an integer mantissa and a binary
3527# exponent. Assumes you've already made sure the number isn't zero or
3528# some weird infinity or NaN.
3529sub split_float {
3530 my($f) = @_;
3531 my $exponent = 0;
3532 if ($f == int($f)) {
3533 while ($f % 2 == 0) {
3534 $f /= 2;
3535 $exponent++;
3536 }
3537 } else {
3538 while ($f != int($f)) {
3539 $f *= 2;
3540 $exponent--;
3541 }
3542 }
3543 my $mantissa = sprintf("%.0f", $f);
3544 return ($mantissa, $exponent);
3545}
3546
6e90668e 3547sub const {
d989cdac
SM
3548 my $self = shift;
3549 my($sv, $cx) = @_;
3550 if ($self->{'use_dumper'}) {
3551 return $self->const_dumper($sv, $cx);
3552 }
6e90668e 3553 if (class($sv) eq "SPECIAL") {
d989cdac
SM
3554 # sv_undef, sv_yes, sv_no
3555 return ('undef', '1', $self->maybe_parens("!1", $cx, 21))[$$sv-1];
7a9b44b9
RH
3556 } elsif (class($sv) eq "NULL") {