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6e90668e 1# B::Deparse.pm
d989cdac 2# Copyright (c) 1998-2000, 2002, 2003 Stephen McCamant. All rights reserved.
6e90668e
SM
3# This module is free software; you can redistribute and/or modify
4# it under the same terms as Perl itself.
5
6# This is based on the module of the same name by Malcolm Beattie,
7# but essentially none of his code remains.
8
a798dbf2 9package B::Deparse;
ff97752d 10use Carp;
51a5edaf 11use B qw(class main_root main_start main_cv svref_2object opnumber perlstring
bd0865ec 12 OPf_WANT OPf_WANT_VOID OPf_WANT_SCALAR OPf_WANT_LIST
90c0eb26 13 OPf_KIDS OPf_REF OPf_STACKED OPf_SPECIAL OPf_MOD
ce4e655d 14 OPpLVAL_INTRO OPpOUR_INTRO OPpENTERSUB_AMPER OPpSLICE OPpCONST_BARE
3ed82cfc 15 OPpTRANS_SQUASH OPpTRANS_DELETE OPpTRANS_COMPLEMENT OPpTARGET_MY
7e80da18
RH
16 OPpCONST_ARYBASE OPpEXISTS_SUB OPpSORT_NUMERIC OPpSORT_INTEGER
17 OPpSORT_REVERSE
d989cdac 18 SVf_IOK SVf_NOK SVf_ROK SVf_POK SVpad_OUR SVf_FAKE SVs_RMG SVs_SMG
06492da6 19 CVf_METHOD CVf_LOCKED CVf_LVALUE CVf_ASSERTION
fcd95d64 20 PMf_KEEP PMf_GLOBAL PMf_CONTINUE PMf_EVAL PMf_ONCE PMf_SKIPWHITE
bd0865ec 21 PMf_MULTILINE PMf_SINGLELINE PMf_FOLD PMf_EXTENDED);
d989cdac 22$VERSION = 0.64;
a798dbf2 23use strict;
2ae48fff 24use vars qw/$AUTOLOAD/;
34a48b4b 25use warnings ();
a798dbf2 26
6e90668e
SM
27# Changes between 0.50 and 0.51:
28# - fixed nulled leave with live enter in sort { }
29# - fixed reference constants (\"str")
30# - handle empty programs gracefully
31# - handle infinte loops (for (;;) {}, while (1) {})
32# - differentiate between `for my $x ...' and `my $x; for $x ...'
33# - various minor cleanups
34# - moved globals into an object
35# - added `-u', like B::C
36# - package declarations using cop_stash
37# - subs, formats and code sorted by cop_seq
f6f9bdb7 38# Changes between 0.51 and 0.52:
4d1ff10f 39# - added pp_threadsv (special variables under USE_5005THREADS)
f6f9bdb7 40# - added documentation
bd0865ec 41# Changes between 0.52 and 0.53:
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SM
42# - many changes adding precedence contexts and associativity
43# - added `-p' and `-s' output style options
44# - various other minor fixes
bd0865ec 45# Changes between 0.53 and 0.54:
d7f5b6da
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46# - added support for new `for (1..100)' optimization,
47# thanks to Gisle Aas
bd0865ec 48# Changes between 0.54 and 0.55:
90be192f
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49# - added support for new qr// construct
50# - added support for new pp_regcreset OP
bd0865ec 51# Changes between 0.55 and 0.56:
f5aa8f4e
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52# - tested on base/*.t, cmd/*.t, comp/*.t, io/*.t
53# - fixed $# on non-lexicals broken in last big rewrite
54# - added temporary fix for change in opcode of OP_STRINGIFY
55# - fixed problem in 0.54's for() patch in `for (@ary)'
56# - fixed precedence in conditional of ?:
57# - tweaked list paren elimination in `my($x) = @_'
58# - made continue-block detection trickier wrt. null ops
59# - fixed various prototype problems in pp_entersub
60# - added support for sub prototypes that never get GVs
61# - added unquoting for special filehandle first arg in truncate
62# - print doubled rv2gv (a bug) as `*{*GV}' instead of illegal `**GV'
63# - added semicolons at the ends of blocks
64# - added -l `#line' declaration option -- fixes cmd/subval.t 27,28
bd0865ec
GS
65# Changes between 0.56 and 0.561:
66# - fixed multiply-declared my var in pp_truncate (thanks to Sarathy)
67# - used new B.pm symbolic constants (done by Nick Ing-Simmons)
68# Changes between 0.561 and 0.57:
69# - stylistic changes to symbolic constant stuff
70# - handled scope in s///e replacement code
71# - added unquote option for expanding "" into concats, etc.
72# - split method and proto parts of pp_entersub into separate functions
73# - various minor cleanups
f4a44678
SM
74# Changes after 0.57:
75# - added parens in \&foo (patch by Albert Dvornik)
76# Changes between 0.57 and 0.58:
77# - fixed `0' statements that weren't being printed
78# - added methods for use from other programs
79# (based on patches from James Duncan and Hugo van der Sanden)
80# - added -si and -sT to control indenting (also based on a patch from Hugo)
81# - added -sv to print something else instead of '???'
82# - preliminary version of utf8 tr/// handling
3ed82cfc
GS
83# Changes after 0.58:
84# - uses of $op->ppaddr changed to new $op->name (done by Sarathy)
d989cdac 85# - added support for Hugo's new OP_SETSTATE (like nextstate)
3ed82cfc
GS
86# Changes between 0.58 and 0.59
87# - added support for Chip's OP_METHOD_NAMED
88# - added support for Ilya's OPpTARGET_MY optimization
89# - elided arrows before `()' subscripts when possible
58cccf98
SM
90# Changes between 0.59 and 0.60
91# - support for method attribues was added
92# - some warnings fixed
93# - separate recognition of constant subs
94# - rewrote continue block handling, now recoginizing for loops
95# - added more control of expanding control structures
c7f67cde
RH
96# Changes between 0.60 and 0.61 (mostly by Robin Houston)
97# - many bug-fixes
98# - support for pragmas and 'use'
99# - support for the little-used $[ variable
100# - support for __DATA__ sections
101# - UTF8 support
102# - BEGIN, CHECK, INIT and END blocks
103# - scoping of subroutine declarations fixed
104# - compile-time output from the input program can be suppressed, so that the
105# output is just the deparsed code. (a change to O.pm in fact)
106# - our() declarations
107# - *all* the known bugs are now listed in the BUGS section
108# - comprehensive test mechanism (TEST -deparse)
9a58b761
RGS
109# Changes between 0.62 and 0.63 (mostly by Rafael Garcia-Suarez)
110# - bug-fixes
111# - new switch -P
112# - support for command-line switches (-l, -0, etc.)
d989cdac
SM
113# Changes between 0.63 and 0.64
114# - support for //, CHECK blocks, and assertions
115# - improved handling of foreach loops and lexicals
116# - option to use Data::Dumper for constants
117# - more bug fixes
118# - discovered lots more bugs not yet fixed
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SM
119
120# Todo:
2a9e2f8a
RH
121# (See also BUGS section at the end of this file)
122#
f4a44678
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123# - finish tr/// changes
124# - add option for even more parens (generalize \&foo change)
90be192f 125# - left/right context
58cccf98 126# - copy comments (look at real text with $^P?)
f5aa8f4e 127# - avoid semis in one-statement blocks
9d2c6865 128# - associativity of &&=, ||=, ?:
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129# - ',' => '=>' (auto-unquote?)
130# - break long lines ("\r" as discretionary break?)
f4a44678
SM
131# - configurable syntax highlighting: ANSI color, HTML, TeX, etc.
132# - more style options: brace style, hex vs. octal, quotes, ...
133# - print big ints as hex/octal instead of decimal (heuristic?)
3ed82cfc 134# - handle `my $x if 0'?
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SM
135# - version using op_next instead of op_first/sibling?
136# - avoid string copies (pass arrays, one big join?)
9d2c6865 137# - here-docs?
6e90668e 138
d989cdac
SM
139# Current test.deparse failures
140# comp/assertions 38 - disabled assertions should be like "my($x) if 0"
141# 'sub f : assertion {}; no assertions; my $x=1; {f(my $x=2); print "$x\n"}'
142# comp/hints 6 - location of BEGIN blocks wrt. block openings
143# run/switchI 1 - missing -I switches entirely
144# perl -Ifoo -e 'print @INC'
145# op/caller 2 - warning mask propagates backwards before warnings::register
146# 'use warnings; BEGIN {${^WARNING_BITS} eq "U"x12;} use warnings::register'
147# op/getpid 2 - can't assign to shared my() declaration (threads only)
148# 'my $x : shared = 5'
149# op/override 7 - parens on overriden require change v-string interpretation
150# 'BEGIN{*CORE::GLOBAL::require=sub {}} require v5.6'
151# c.f. 'BEGIN { *f = sub {0} }; f 2'
152# op/pat 774 - losing Unicode-ness of Latin1-only strings
153# 'use charnames ":short"; $x="\N{latin:a with acute}"'
154# op/recurse 12 - missing parens on recursive call makes it look like method
155# 'sub f { f($x) }'
156# op/subst 90 - inconsistent handling of utf8 under "use utf8"
157# op/taint 29 - "use re 'taint'" deparsed in the wrong place wrt. block open
158# op/tiehandle compile - "use strict" deparsed in the wrong place
159# uni/tr_ several
160# ext/B/t/xref 11 - line numbers when we add newlines to one-line subs
161# ext/Data/Dumper/t/dumper compile
162# ext/DB_file/several
163# ext/Encode/several
164# ext/Ernno/Errno warnings
165# ext/IO/lib/IO/t/io_sel 23
166# ext/PerlIO/t/encoding compile
167# ext/POSIX/t/posix 6
168# ext/Socket/Socket 8
169# ext/Storable/t/croak compile
170# lib/Attribute/Handlers/t/multi compile
171# lib/bignum/ several
172# lib/charnames 35
173# lib/constant 32
174# lib/English 40
175# lib/ExtUtils/t/bytes 4
176# lib/File/DosGlob compile
177# lib/Filter/Simple/t/data 1
178# lib/Math/BigInt/t/constant 1
179# lib/Net/t/config Deparse-warning
180# lib/overload compile
181# lib/Switch/ several
182# lib/Symbol 4
183# lib/Test/Simple several
184# lib/Term/Complete
185# lib/Tie/File/t/29_downcopy 5
186# lib/vars 22
f5aa8f4e 187
6e90668e
SM
188# Object fields (were globals):
189#
190# avoid_local:
191# (local($a), local($b)) and local($a, $b) have the same internal
192# representation but the short form looks better. We notice we can
193# use a large-scale local when checking the list, but need to prevent
d989cdac 194# individual locals too. This hash holds the addresses of OPs that
6e90668e
SM
195# have already had their local-ness accounted for. The same thing
196# is done with my().
197#
198# curcv:
199# CV for current sub (or main program) being deparsed
200#
8510e997
RH
201# curcvlex:
202# Cached hash of lexical variables for curcv: keys are names,
203# each value is an array of pairs, indicating the cop_seq of scopes
204# in which a var of that name is valid.
205#
34a48b4b
RH
206# curcop:
207# COP for statement being deparsed
208#
6e90668e
SM
209# curstash:
210# name of the current package for deparsed code
211#
212# subs_todo:
34a48b4b 213# array of [cop_seq, CV, is_format?] for subs and formats we still
6e90668e
SM
214# want to deparse
215#
f5aa8f4e
SM
216# protos_todo:
217# as above, but [name, prototype] for subs that never got a GV
218#
6e90668e
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219# subs_done, forms_done:
220# keys are addresses of GVs for subs and formats we've already
221# deparsed (or at least put into subs_todo)
9d2c6865 222#
0ca62a8e
RH
223# subs_declared
224# keys are names of subs for which we've printed declarations.
225# That means we can omit parentheses from the arguments.
226#
1d38190f
RGS
227# subs_deparsed
228# Keeps track of fully qualified names of all deparsed subs.
229#
9d2c6865 230# parens: -p
f5aa8f4e 231# linenums: -l
bd0865ec 232# unquote: -q
9d2c6865 233# cuddle: ` ' or `\n', depending on -sC
f4a44678
SM
234# indent_size: -si
235# use_tabs: -sT
236# ex_const: -sv
9d2c6865
SM
237
238# A little explanation of how precedence contexts and associativity
239# work:
240#
241# deparse() calls each per-op subroutine with an argument $cx (short
242# for context, but not the same as the cx* in the perl core), which is
243# a number describing the op's parents in terms of precedence, whether
f5aa8f4e 244# they're inside an expression or at statement level, etc. (see
9d2c6865
SM
245# chart below). When ops with children call deparse on them, they pass
246# along their precedence. Fractional values are used to implement
247# associativity (`($x + $y) + $z' => `$x + $y + $y') and related
248# parentheses hacks. The major disadvantage of this scheme is that
249# it doesn't know about right sides and left sides, so say if you
250# assign a listop to a variable, it can't tell it's allowed to leave
251# the parens off the listop.
252
253# Precedences:
254# 26 [TODO] inside interpolation context ("")
255# 25 left terms and list operators (leftward)
256# 24 left ->
257# 23 nonassoc ++ --
258# 22 right **
259# 21 right ! ~ \ and unary + and -
260# 20 left =~ !~
261# 19 left * / % x
262# 18 left + - .
263# 17 left << >>
264# 16 nonassoc named unary operators
265# 15 nonassoc < > <= >= lt gt le ge
266# 14 nonassoc == != <=> eq ne cmp
267# 13 left &
268# 12 left | ^
269# 11 left &&
270# 10 left ||
271# 9 nonassoc .. ...
272# 8 right ?:
273# 7 right = += -= *= etc.
274# 6 left , =>
275# 5 nonassoc list operators (rightward)
276# 4 right not
277# 3 left and
278# 2 left or xor
279# 1 statement modifiers
d989cdac 280# 0.5 statements, but still print scopes as do { ... }
9d2c6865
SM
281# 0 statement level
282
283# Nonprinting characters with special meaning:
284# \cS - steal parens (see maybe_parens_unop)
285# \n - newline and indent
286# \t - increase indent
287# \b - decrease indent (`outdent')
f5aa8f4e 288# \f - flush left (no indent)
9d2c6865 289# \cK - kill following semicolon, if any
6e90668e
SM
290
291sub null {
292 my $op = shift;
293 return class($op) eq "NULL";
294}
295
296sub todo {
297 my $self = shift;
34a48b4b 298 my($cv, $is_form) = @_;
e31885a0 299 return unless ($cv->FILE eq $0 || exists $self->{files}{$cv->FILE});
6e90668e 300 my $seq;
d989cdac
SM
301 if ($cv->OUTSIDE_SEQ) {
302 $seq = $cv->OUTSIDE_SEQ;
303 } elsif (!null($cv->START) and is_state($cv->START)) {
6e90668e
SM
304 $seq = $cv->START->cop_seq;
305 } else {
306 $seq = 0;
307 }
34a48b4b 308 push @{$self->{'subs_todo'}}, [$seq, $cv, $is_form];
1d38190f
RGS
309 unless ($is_form || class($cv->STASH) eq 'SPECIAL') {
310 $self->{'subs_deparsed'}{$cv->STASH->NAME."::".$cv->GV->NAME} = 1;
311 }
6e90668e
SM
312}
313
314sub next_todo {
315 my $self = shift;
316 my $ent = shift @{$self->{'subs_todo'}};
34a48b4b
RH
317 my $cv = $ent->[1];
318 my $gv = $cv->GV;
319 my $name = $self->gv_name($gv);
6e90668e
SM
320 if ($ent->[2]) {
321 return "format $name =\n"
e31885a0 322 . $self->deparse_format($ent->[1]). "\n";
6e90668e 323 } else {
0ca62a8e 324 $self->{'subs_declared'}{$name} = 1;
34a48b4b
RH
325 if ($name eq "BEGIN") {
326 my $use_dec = $self->begin_is_use($cv);
d989cdac 327 if (defined ($use_dec) and $self->{'expand'} < 5) {
0e7fe0f0
RH
328 return () if 0 == length($use_dec);
329 return $use_dec;
330 }
34a48b4b 331 }
a0035eb8
RH
332 my $l = '';
333 if ($self->{'linenums'}) {
334 my $line = $gv->LINE;
335 my $file = $gv->FILE;
336 $l = "\n\f#line $line \"$file\"\n";
337 }
127212b2
DM
338 my $p = '';
339 if (class($cv->STASH) ne "SPECIAL") {
340 my $stash = $cv->STASH->NAME;
341 if ($stash ne $self->{'curstash'}) {
342 $p = "package $stash;\n";
343 $name = "$self->{'curstash'}::$name" unless $name =~ /::/;
344 $self->{'curstash'} = $stash;
345 }
346 $name =~ s/^\Q$stash\E:://;
347 }
348 return "${p}${l}sub $name " . $self->deparse_sub($cv);
34a48b4b
RH
349 }
350}
351
352# Return a "use" declaration for this BEGIN block, if appropriate
353sub begin_is_use {
354 my ($self, $cv) = @_;
355 my $root = $cv->ROOT;
80dc0729 356 local @$self{qw'curcv curcvlex'} = ($cv);
34a48b4b
RH
357#require B::Debug;
358#B::walkoptree($cv->ROOT, "debug");
359 my $lineseq = $root->first;
360 return if $lineseq->name ne "lineseq";
361
362 my $req_op = $lineseq->first->sibling;
363 return if $req_op->name ne "require";
364
365 my $module;
366 if ($req_op->first->private & OPpCONST_BARE) {
367 # Actually it should always be a bareword
368 $module = $self->const_sv($req_op->first)->PV;
369 $module =~ s[/][::]g;
370 $module =~ s/.pm$//;
371 }
372 else {
d989cdac 373 $module = $self->const($self->const_sv($req_op->first), 6);
34a48b4b
RH
374 }
375
376 my $version;
377 my $version_op = $req_op->sibling;
378 return if class($version_op) eq "NULL";
379 if ($version_op->name eq "lineseq") {
380 # We have a version parameter; skip nextstate & pushmark
381 my $constop = $version_op->first->next->next;
382
383 return unless $self->const_sv($constop)->PV eq $module;
384 $constop = $constop->sibling;
a58644de 385 $version = $self->const_sv($constop);
d989cdac
SM
386 if (class($version) eq "IV") {
387 $version = $version->int_value;
388 } elsif (class($version) eq "NV") {
389 $version = $version->NV;
390 } elsif (class($version) ne "PVMG") {
391 # Includes PVIV and PVNV
a58644de
RGS
392 $version = $version->PV;
393 } else {
394 # version specified as a v-string
395 $version = 'v'.join '.', map ord, split //, $version->PV;
396 }
34a48b4b
RH
397 $constop = $constop->sibling;
398 return if $constop->name ne "method_named";
399 return if $self->const_sv($constop)->PV ne "VERSION";
400 }
401
402 $lineseq = $version_op->sibling;
403 return if $lineseq->name ne "lineseq";
404 my $entersub = $lineseq->first->sibling;
405 if ($entersub->name eq "stub") {
406 return "use $module $version ();\n" if defined $version;
407 return "use $module ();\n";
408 }
409 return if $entersub->name ne "entersub";
410
411 # See if there are import arguments
412 my $args = '';
413
6ec152c3
RH
414 my $svop = $entersub->first->sibling; # Skip over pushmark
415 return unless $self->const_sv($svop)->PV eq $module;
34a48b4b
RH
416
417 # Pull out the arguments
6ec152c3
RH
418 for ($svop=$svop->sibling; $svop->name ne "method_named";
419 $svop = $svop->sibling) {
34a48b4b 420 $args .= ", " if length($args);
6ec152c3 421 $args .= $self->deparse($svop, 6);
34a48b4b
RH
422 }
423
424 my $use = 'use';
6ec152c3 425 my $method_named = $svop;
34a48b4b
RH
426 return if $method_named->name ne "method_named";
427 my $method_name = $self->const_sv($method_named)->PV;
428
429 if ($method_name eq "unimport") {
430 $use = 'no';
431 }
432
433 # Certain pragmas are dealt with using hint bits,
434 # so we ignore them here
435 if ($module eq 'strict' || $module eq 'integer'
0e7fe0f0 436 || $module eq 'bytes' || $module eq 'warnings') {
34a48b4b
RH
437 return "";
438 }
439
440 if (defined $version && length $args) {
441 return "$use $module $version ($args);\n";
442 } elsif (defined $version) {
443 return "$use $module $version;\n";
444 } elsif (length $args) {
445 return "$use $module ($args);\n";
446 } else {
447 return "$use $module;\n";
6e90668e
SM
448 }
449}
450
6e90668e 451sub stash_subs {
34a48b4b
RH
452 my ($self, $pack) = @_;
453 my (@ret, $stash);
454 if (!defined $pack) {
455 $pack = '';
456 $stash = \%::;
f5aa8f4e 457 }
34a48b4b
RH
458 else {
459 $pack =~ s/(::)?$/::/;
460 no strict 'refs';
461 $stash = \%$pack;
462 }
463 my %stash = svref_2object($stash)->ARRAY;
464 while (my ($key, $val) = each %stash) {
465 next if $key eq 'main::'; # avoid infinite recursion
f5aa8f4e
SM
466 my $class = class($val);
467 if ($class eq "PV") {
a0035eb8
RH
468 # Just a prototype. As an ugly but fairly effective way
469 # to find out if it belongs here is to see if the AUTOLOAD
470 # (if any) for the stash was defined in one of our files.
471 my $A = $stash{"AUTOLOAD"};
472 if (defined ($A) && class($A) eq "GV" && defined($A->CV)
473 && class($A->CV) eq "CV") {
474 my $AF = $A->FILE;
475 next unless $AF eq $0 || exists $self->{'files'}{$AF};
476 }
f5aa8f4e
SM
477 push @{$self->{'protos_todo'}}, [$pack . $key, $val->PV];
478 } elsif ($class eq "IV") {
a0035eb8
RH
479 # Just a name. As above.
480 my $A = $stash{"AUTOLOAD"};
481 if (defined ($A) && class($A) eq "GV" && defined($A->CV)
482 && class($A->CV) eq "CV") {
483 my $AF = $A->FILE;
484 next unless $AF eq $0 || exists $self->{'files'}{$AF};
485 }
d989cdac 486 push @{$self->{'protos_todo'}}, [$pack . $key, undef];
f5aa8f4e 487 } elsif ($class eq "GV") {
34a48b4b 488 if (class(my $cv = $val->CV) ne "SPECIAL") {
f5aa8f4e 489 next if $self->{'subs_done'}{$$val}++;
e31885a0 490 next if $$val != ${$cv->GV}; # Ignore imposters
8510e997 491 $self->todo($cv, 0);
f5aa8f4e 492 }
e31885a0 493 if (class(my $cv = $val->FORM) ne "SPECIAL") {
f5aa8f4e 494 next if $self->{'forms_done'}{$$val}++;
e31885a0
RH
495 next if $$val != ${$cv->GV}; # Ignore imposters
496 $self->todo($cv, 1);
f5aa8f4e 497 }
34a48b4b
RH
498 if (class($val->HV) ne "SPECIAL" && $key =~ /::$/) {
499 $self->stash_subs($pack . $key);
500 }
6e90668e
SM
501 }
502 }
503}
a798dbf2 504
f5aa8f4e
SM
505sub print_protos {
506 my $self = shift;
507 my $ar;
508 my @ret;
509 foreach $ar (@{$self->{'protos_todo'}}) {
510 my $proto = (defined $ar->[1] ? " (". $ar->[1] . ")" : "");
511 push @ret, "sub " . $ar->[0] . "$proto;\n";
512 }
513 delete $self->{'protos_todo'};
514 return @ret;
515}
516
9d2c6865
SM
517sub style_opts {
518 my $self = shift;
519 my $opts = shift;
520 my $opt;
521 while (length($opt = substr($opts, 0, 1))) {
522 if ($opt eq "C") {
523 $self->{'cuddle'} = " ";
f4a44678
SM
524 $opts = substr($opts, 1);
525 } elsif ($opt eq "i") {
526 $opts =~ s/^i(\d+)//;
527 $self->{'indent_size'} = $1;
528 } elsif ($opt eq "T") {
529 $self->{'use_tabs'} = 1;
530 $opts = substr($opts, 1);
531 } elsif ($opt eq "v") {
532 $opts =~ s/^v([^.]*)(.|$)//;
533 $self->{'ex_const'} = $1;
9d2c6865 534 }
9d2c6865
SM
535 }
536}
537
f4a44678
SM
538sub new {
539 my $class = shift;
540 my $self = bless {}, $class;
f4a44678 541 $self->{'cuddle'} = "\n";
d989cdac
SM
542 $self->{'curcop'} = undef;
543 $self->{'curstash'} = "main";
544 $self->{'ex_const'} = "'???'";
793e2a70 545 $self->{'expand'} = 0;
d989cdac
SM
546 $self->{'files'} = {};
547 $self->{'indent_size'} = 4;
793e2a70
RH
548 $self->{'linenums'} = 0;
549 $self->{'parens'} = 0;
d989cdac
SM
550 $self->{'subs_todo'} = [];
551 $self->{'unquote'} = 0;
552 $self->{'use_dumper'} = 0;
553 $self->{'use_tabs'} = 0;
08c6f5ec
RH
554
555 $self->{'ambient_arybase'} = 0;
e31885a0 556 $self->{'ambient_warnings'} = undef; # Assume no lexical warnings
a0405c92 557 $self->{'ambient_hints'} = 0;
08c6f5ec
RH
558 $self->init();
559
f4a44678 560 while (my $arg = shift @_) {
d989cdac
SM
561 if ($arg eq "-d") {
562 $self->{'use_dumper'} = 1;
563 require Data::Dumper;
564 } elsif ($arg =~ /^-f(.*)/) {
34a48b4b 565 $self->{'files'}{$1} = 1;
d989cdac
SM
566 } elsif ($arg eq "-l") {
567 $self->{'linenums'} = 1;
f4a44678
SM
568 } elsif ($arg eq "-p") {
569 $self->{'parens'} = 1;
acaaef34
RGS
570 } elsif ($arg eq "-P") {
571 $self->{'noproto'} = 1;
f4a44678
SM
572 } elsif ($arg eq "-q") {
573 $self->{'unquote'} = 1;
574 } elsif (substr($arg, 0, 2) eq "-s") {
575 $self->style_opts(substr $arg, 2);
58cccf98
SM
576 } elsif ($arg =~ /^-x(\d)$/) {
577 $self->{'expand'} = $1;
f4a44678
SM
578 }
579 }
580 return $self;
581}
582
810aef70
RH
583{
584 # Mask out the bits that L<warnings::register> uses
585 my $WARN_MASK;
586 BEGIN {
587 $WARN_MASK = $warnings::Bits{all} | $warnings::DeadBits{all};
588 }
589 sub WARN_MASK () {
590 return $WARN_MASK;
591 }
34a48b4b
RH
592}
593
08c6f5ec
RH
594# Initialise the contextual information, either from
595# defaults provided with the ambient_pragmas method,
596# or from perl's own defaults otherwise.
597sub init {
598 my $self = shift;
599
600 $self->{'arybase'} = $self->{'ambient_arybase'};
e31885a0
RH
601 $self->{'warnings'} = defined ($self->{'ambient_warnings'})
602 ? $self->{'ambient_warnings'} & WARN_MASK
603 : undef;
a0405c92 604 $self->{'hints'} = $self->{'ambient_hints'} & 0xFF;
217aba5d
RH
605
606 # also a convenient place to clear out subs_declared
607 delete $self->{'subs_declared'};
08c6f5ec
RH
608}
609
a798dbf2 610sub compile {
6e90668e 611 my(@args) = @_;
d989cdac 612 return sub {
f4a44678 613 my $self = B::Deparse->new(@args);
d2bc402e
RGS
614 # First deparse command-line args
615 if (defined $^I) { # deparse -i
51a5edaf 616 print q(BEGIN { $^I = ).perlstring($^I).qq(; }\n);
d2bc402e
RGS
617 }
618 if ($^W) { # deparse -w
619 print qq(BEGIN { \$^W = $^W; }\n);
620 }
621 if ($/ ne "\n" or defined $O::savebackslash) { # deparse -l and -0
51a5edaf
RGS
622 my $fs = perlstring($/) || 'undef';
623 my $bs = perlstring($O::savebackslash) || 'undef';
d2bc402e
RGS
624 print qq(BEGIN { \$/ = $fs; \$\\ = $bs; }\n);
625 }
34a48b4b 626 my @BEGINs = B::begin_av->isa("B::AV") ? B::begin_av->ARRAY : ();
ece599bd 627 my @CHECKs = B::check_av->isa("B::AV") ? B::check_av->ARRAY : ();
34a48b4b
RH
628 my @INITs = B::init_av->isa("B::AV") ? B::init_av->ARRAY : ();
629 my @ENDs = B::end_av->isa("B::AV") ? B::end_av->ARRAY : ();
ece599bd 630 for my $block (@BEGINs, @CHECKs, @INITs, @ENDs) {
e31885a0 631 $self->todo($block, 0);
34a48b4b
RH
632 }
633 $self->stash_subs();
d989cdac
SM
634 local($SIG{"__DIE__"}) =
635 sub {
636 if ($self->{'curcop'}) {
637 my $cop = $self->{'curcop'};
638 my($line, $file) = ($cop->line, $cop->file);
639 print STDERR "While deparsing $file near line $line,\n";
640 }
641 };
6e90668e 642 $self->{'curcv'} = main_cv;
8510e997 643 $self->{'curcvlex'} = undef;
f5aa8f4e 644 print $self->print_protos;
6e90668e 645 @{$self->{'subs_todo'}} =
f4a44678 646 sort {$a->[0] <=> $b->[0]} @{$self->{'subs_todo'}};
d989cdac 647 print $self->indent($self->deparse_root(main_root)), "\n"
f4a44678 648 unless null main_root;
6e90668e
SM
649 my @text;
650 while (scalar(@{$self->{'subs_todo'}})) {
651 push @text, $self->next_todo;
652 }
6f611a1a 653 print $self->indent(join("", @text)), "\n" if @text;
e31885a0
RH
654
655 # Print __DATA__ section, if necessary
656 no strict 'refs';
96c57f7e
RGS
657 my $laststash = defined $self->{'curcop'}
658 ? $self->{'curcop'}->stash->NAME : $self->{'curstash'};
659 if (defined *{$laststash."::DATA"}{IO}) {
127212b2
DM
660 print "package $laststash;\n"
661 unless $laststash eq $self->{'curstash'};
e31885a0 662 print "__DATA__\n";
96c57f7e 663 print readline(*{$laststash."::DATA"});
e31885a0 664 }
a798dbf2 665 }
a798dbf2
MB
666}
667
f4a44678
SM
668sub coderef2text {
669 my $self = shift;
670 my $sub = shift;
0853f172 671 croak "Usage: ->coderef2text(CODEREF)" unless UNIVERSAL::isa($sub, "CODE");
08c6f5ec
RH
672
673 $self->init();
f4a44678
SM
674 return $self->indent($self->deparse_sub(svref_2object($sub)));
675}
676
08c6f5ec
RH
677sub ambient_pragmas {
678 my $self = shift;
e31885a0 679 my ($arybase, $hint_bits, $warning_bits) = (0, 0);
08c6f5ec
RH
680
681 while (@_ > 1) {
682 my $name = shift();
683 my $val = shift();
684
685 if ($name eq 'strict') {
686 require strict;
687
688 if ($val eq 'none') {
689 $hint_bits &= ~strict::bits(qw/refs subs vars/);
690 next();
691 }
692
693 my @names;
694 if ($val eq "all") {
695 @names = qw/refs subs vars/;
696 }
697 elsif (ref $val) {
698 @names = @$val;
699 }
700 else {
a0405c92 701 @names = split' ', $val;
08c6f5ec
RH
702 }
703 $hint_bits |= strict::bits(@names);
704 }
705
706 elsif ($name eq '$[') {
707 $arybase = $val;
708 }
709
a0405c92
RH
710 elsif ($name eq 'integer'
711 || $name eq 'bytes'
712 || $name eq 'utf8') {
713 require "$name.pm";
08c6f5ec 714 if ($val) {
a0405c92
RH
715 $hint_bits |= ${$::{"${name}::"}{"hint_bits"}};
716 }
717 else {
718 $hint_bits &= ~${$::{"${name}::"}{"hint_bits"}};
719 }
720 }
721
722 elsif ($name eq 're') {
723 require re;
724 if ($val eq 'none') {
2570cdf1 725 $hint_bits &= ~re::bits(qw/taint eval/);
a0405c92
RH
726 next();
727 }
728
729 my @names;
730 if ($val eq 'all') {
2570cdf1 731 @names = qw/taint eval/;
a0405c92
RH
732 }
733 elsif (ref $val) {
734 @names = @$val;
08c6f5ec
RH
735 }
736 else {
a0405c92 737 @names = split' ',$val;
08c6f5ec 738 }
a0405c92 739 $hint_bits |= re::bits(@names);
08c6f5ec
RH
740 }
741
742 elsif ($name eq 'warnings') {
08c6f5ec 743 if ($val eq 'none') {
810aef70 744 $warning_bits = $warnings::NONE;
08c6f5ec
RH
745 next();
746 }
747
748 my @names;
749 if (ref $val) {
750 @names = @$val;
751 }
752 else {
753 @names = split/\s+/, $val;
754 }
755
810aef70 756 $warning_bits = $warnings::NONE if !defined ($warning_bits);
08c6f5ec
RH
757 $warning_bits |= warnings::bits(@names);
758 }
759
760 elsif ($name eq 'warning_bits') {
761 $warning_bits = $val;
762 }
763
764 elsif ($name eq 'hint_bits') {
765 $hint_bits = $val;
766 }
767
768 else {
769 croak "Unknown pragma type: $name";
770 }
771 }
772 if (@_) {
773 croak "The ambient_pragmas method expects an even number of args";
774 }
775
776 $self->{'ambient_arybase'} = $arybase;
777 $self->{'ambient_warnings'} = $warning_bits;
a0405c92 778 $self->{'ambient_hints'} = $hint_bits;
08c6f5ec
RH
779}
780
d989cdac 781# This method is the inner loop, so try to keep it simple
6e90668e
SM
782sub deparse {
783 my $self = shift;
d989cdac 784 my($op, $cx) = @_;
34a48b4b
RH
785
786 Carp::confess("Null op in deparse") if !defined($op)
787 || class($op) eq "NULL";
3f872cb9 788 my $meth = "pp_" . $op->name;
9d2c6865 789 return $self->$meth($op, $cx);
a798dbf2
MB
790}
791
6e90668e 792sub indent {
f4a44678 793 my $self = shift;
6e90668e
SM
794 my $txt = shift;
795 my @lines = split(/\n/, $txt);
796 my $leader = "";
f4a44678 797 my $level = 0;
6e90668e
SM
798 my $line;
799 for $line (@lines) {
f4a44678
SM
800 my $cmd = substr($line, 0, 1);
801 if ($cmd eq "\t" or $cmd eq "\b") {
802 $level += ($cmd eq "\t" ? 1 : -1) * $self->{'indent_size'};
803 if ($self->{'use_tabs'}) {
804 $leader = "\t" x ($level / 8) . " " x ($level % 8);
805 } else {
806 $leader = " " x $level;
807 }
6e90668e
SM
808 $line = substr($line, 1);
809 }
f5aa8f4e
SM
810 if (substr($line, 0, 1) eq "\f") {
811 $line = substr($line, 1); # no indent
812 } else {
813 $line = $leader . $line;
814 }
9d2c6865 815 $line =~ s/\cK;?//g;
6e90668e
SM
816 }
817 return join("\n", @lines);
818}
819
6e90668e
SM
820sub deparse_sub {
821 my $self = shift;
822 my $cv = shift;
823 my $proto = "";
ce4e655d 824Carp::confess("NULL in deparse_sub") if !defined($cv) || $cv->isa("B::NULL");
34a48b4b
RH
825Carp::confess("SPECIAL in deparse_sub") if $cv->isa("B::SPECIAL");
826 local $self->{'curcop'} = $self->{'curcop'};
6e90668e
SM
827 if ($cv->FLAGS & SVf_POK) {
828 $proto = "(". $cv->PV . ") ";
829 }
06492da6 830 if ($cv->CvFLAGS & (CVf_METHOD|CVf_LOCKED|CVf_LVALUE|CVf_ASSERTION)) {
6aaf4108
SC
831 $proto .= ": ";
832 $proto .= "lvalue " if $cv->CvFLAGS & CVf_LVALUE;
833 $proto .= "locked " if $cv->CvFLAGS & CVf_LOCKED;
834 $proto .= "method " if $cv->CvFLAGS & CVf_METHOD;
06492da6 835 $proto .= "assertion " if $cv->CvFLAGS & CVf_ASSERTION;
6aaf4108
SC
836 }
837
6e90668e 838 local($self->{'curcv'}) = $cv;
8510e997 839 local($self->{'curcvlex'});
a0405c92
RH
840 local(@$self{qw'curstash warnings hints'})
841 = @$self{qw'curstash warnings hints'};
ce4e655d 842 my $body;
6e90668e 843 if (not null $cv->ROOT) {
ce4e655d
RH
844 my $lineseq = $cv->ROOT->first;
845 if ($lineseq->name eq "lineseq") {
846 my @ops;
847 for(my$o=$lineseq->first; $$o; $o=$o->sibling) {
848 push @ops, $o;
849 }
850 $body = $self->lineseq(undef, @ops).";";
851 my $scope_en = $self->find_scope_en($lineseq);
852 if (defined $scope_en) {
853 my $subs = join"", $self->seq_subs($scope_en);
854 $body .= ";\n$subs" if length($subs);
855 }
856 }
857 else {
858 $body = $self->deparse($cv->ROOT->first, 0);
859 }
de3f1649 860 }
ce4e655d
RH
861 else {
862 my $sv = $cv->const_sv;
863 if ($$sv) {
864 # uh-oh. inlinable sub... format it differently
d989cdac 865 return $proto . "{ " . $self->const($sv, 0) . " }\n";
ce4e655d
RH
866 } else { # XSUB? (or just a declaration)
867 return "$proto;\n";
868 }
6e90668e 869 }
ce4e655d 870 return $proto ."{\n\t$body\n\b}" ."\n";
6e90668e
SM
871}
872
873sub deparse_format {
874 my $self = shift;
875 my $form = shift;
876 my @text;
877 local($self->{'curcv'}) = $form;
8510e997 878 local($self->{'curcvlex'});
67fc2416 879 local($self->{'in_format'}) = 1;
a0405c92 880 local(@$self{qw'curstash warnings hints'})
67fc2416 881 = @$self{qw'curstash warnings hints'};
6e90668e
SM
882 my $op = $form->ROOT;
883 my $kid;
fb725297
RGS
884 return "\f." if $op->first->name eq 'stub'
885 || $op->first->name eq 'nextstate';
6e90668e
SM
886 $op = $op->first->first; # skip leavewrite, lineseq
887 while (not null $op) {
888 $op = $op->sibling; # skip nextstate
889 my @exprs;
890 $kid = $op->first->sibling; # skip pushmark
a5b0cd91 891 push @text, "\f".$self->const_sv($kid)->PV;
6e90668e
SM
892 $kid = $kid->sibling;
893 for (; not null $kid; $kid = $kid->sibling) {
9d2c6865 894 push @exprs, $self->deparse($kid, 0);
6e90668e 895 }
a5b0cd91 896 push @text, "\f".join(", ", @exprs)."\n" if @exprs;
6e90668e
SM
897 $op = $op->sibling;
898 }
a5b0cd91 899 return join("", @text) . "\f.";
6e90668e
SM
900}
901
6e90668e 902sub is_scope {
a798dbf2 903 my $op = shift;
3f872cb9
GS
904 return $op->name eq "leave" || $op->name eq "scope"
905 || $op->name eq "lineseq"
d989cdac 906 || ($op->name eq "null" && class($op) eq "UNOP"
3f872cb9 907 && (is_scope($op->first) || $op->first->name eq "enter"));
6e90668e
SM
908}
909
910sub is_state {
3f872cb9
GS
911 my $name = $_[0]->name;
912 return $name eq "nextstate" || $name eq "dbstate" || $name eq "setstate";
6e90668e
SM
913}
914
915sub is_miniwhile { # check for one-line loop (`foo() while $y--')
916 my $op = shift;
d989cdac 917 return (!null($op) and null($op->sibling)
3f872cb9
GS
918 and $op->name eq "null" and class($op) eq "UNOP"
919 and (($op->first->name =~ /^(and|or)$/
920 and $op->first->first->sibling->name eq "lineseq")
921 or ($op->first->name eq "lineseq"
6e90668e 922 and not null $op->first->first->sibling
3f872cb9 923 and $op->first->first->sibling->name eq "unstack")
6e90668e
SM
924 ));
925}
926
d989cdac
SM
927# Check if the op and its sibling are the initialization and the rest of a
928# for (..;..;..) { ... } loop
929sub is_for_loop {
930 my $op = shift;
931 # This OP might be almost anything, though it won't be a
932 # nextstate. (It's the initialization, so in the canonical case it
933 # will be an sassign.) The sibling is a lineseq whose first child
934 # is a nextstate and whose second is a leaveloop.
935 my $lseq = $op->sibling;
936 if (!is_state $op and !null($lseq) and $lseq->name eq "lineseq") {
937 if ($lseq->first && !null($lseq->first) && is_state($lseq->first)
938 && (my $sib = $lseq->first->sibling)) {
939 return (!null($sib) && $sib->name eq "leaveloop");
940 }
941 }
942 return 0;
943}
944
6e90668e
SM
945sub is_scalar {
946 my $op = shift;
3f872cb9
GS
947 return ($op->name eq "rv2sv" or
948 $op->name eq "padsv" or
949 $op->name eq "gv" or # only in array/hash constructs
bd0865ec 950 $op->flags & OPf_KIDS && !null($op->first)
3f872cb9 951 && $op->first->name eq "gvsv");
6e90668e
SM
952}
953
9d2c6865
SM
954sub maybe_parens {
955 my $self = shift;
956 my($text, $cx, $prec) = @_;
957 if ($prec < $cx # unary ops nest just fine
958 or $prec == $cx and $cx != 4 and $cx != 16 and $cx != 21
959 or $self->{'parens'})
960 {
961 $text = "($text)";
962 # In a unop, let parent reuse our parens; see maybe_parens_unop
963 $text = "\cS" . $text if $cx == 16;
964 return $text;
965 } else {
966 return $text;
967 }
968}
969
970# same as above, but get around the `if it looks like a function' rule
971sub maybe_parens_unop {
972 my $self = shift;
973 my($name, $kid, $cx) = @_;
974 if ($cx > 16 or $self->{'parens'}) {
a0035eb8
RH
975 $kid = $self->deparse($kid, 1);
976 if ($name eq "umask" && $kid =~ /^\d+$/) {
977 $kid = sprintf("%#o", $kid);
978 }
979 return "$name($kid)";
9d2c6865
SM
980 } else {
981 $kid = $self->deparse($kid, 16);
a0035eb8
RH
982 if ($name eq "umask" && $kid =~ /^\d+$/) {
983 $kid = sprintf("%#o", $kid);
984 }
9d2c6865
SM
985 if (substr($kid, 0, 1) eq "\cS") {
986 # use kid's parens
987 return $name . substr($kid, 1);
988 } elsif (substr($kid, 0, 1) eq "(") {
989 # avoid looks-like-a-function trap with extra parens
990 # (`+' can lead to ambiguities)
991 return "$name(" . $kid . ")";
992 } else {
993 return "$name $kid";
994 }
995 }
996}
997
998sub maybe_parens_func {
999 my $self = shift;
1000 my($func, $text, $cx, $prec) = @_;
1001 if ($prec <= $cx or substr($text, 0, 1) eq "(" or $self->{'parens'}) {
1002 return "$func($text)";
1003 } else {
1004 return "$func $text";
1005 }
1006}
1007
6e90668e
SM
1008sub maybe_local {
1009 my $self = shift;
9d2c6865 1010 my($op, $cx, $text) = @_;
ce4e655d
RH
1011 my $our_intro = ($op->name =~ /^(gv|rv2)[ash]v$/) ? OPpOUR_INTRO : 0;
1012 if ($op->private & (OPpLVAL_INTRO|$our_intro)
1013 and not $self->{'avoid_local'}{$$op}) {
1014 my $our_local = ($op->private & OPpLVAL_INTRO) ? "local" : "our";
8e3542b6
RB
1015 if( $our_local eq 'our' ) {
1016 die "Unexpected our($text)\n" unless $text =~ /^\W(\w+::)*\w+\z/;
d989cdac 1017 $text =~ s/(\w+::)+//;
8e3542b6 1018 }
e8d3f51b 1019 if (want_scalar($op)) {
ce4e655d 1020 return "$our_local $text";
e8d3f51b 1021 } else {
ce4e655d 1022 return $self->maybe_parens_func("$our_local", $text, $cx, 16);
e8d3f51b 1023 }
6e90668e
SM
1024 } else {
1025 return $text;
a798dbf2 1026 }
a798dbf2
MB
1027}
1028
3ed82cfc
GS
1029sub maybe_targmy {
1030 my $self = shift;
1031 my($op, $cx, $func, @args) = @_;
1032 if ($op->private & OPpTARGET_MY) {
1033 my $var = $self->padname($op->targ);
1034 my $val = $func->($self, $op, 7, @args);
1035 return $self->maybe_parens("$var = $val", $cx, 7);
1036 } else {
1037 return $func->($self, $op, $cx, @args);
1038 }
1039}
1040
6e90668e
SM
1041sub padname_sv {
1042 my $self = shift;
1043 my $targ = shift;
d989cdac 1044 return $self->{'curcv'}->PADLIST->ARRAYelt(0)->ARRAYelt($targ);
6e90668e
SM
1045}
1046
1047sub maybe_my {
1048 my $self = shift;
9d2c6865 1049 my($op, $cx, $text) = @_;
4c1f658f 1050 if ($op->private & OPpLVAL_INTRO and not $self->{'avoid_local'}{$$op}) {
e8d3f51b
RH
1051 if (want_scalar($op)) {
1052 return "my $text";
1053 } else {
1054 return $self->maybe_parens_func("my", $text, $cx, 16);
1055 }
6e90668e
SM
1056 } else {
1057 return $text;
1058 }
1059}
1060
9d2c6865
SM
1061# The following OPs don't have functions:
1062
1063# pp_padany -- does not exist after parsing
9d2c6865 1064
2ae48fff
RGS
1065sub AUTOLOAD {
1066 if ($AUTOLOAD =~ s/^.*::pp_//) {
1067 warn "unexpected OP_".uc $AUTOLOAD;
1068 return "XXX";
1069 } else {
1070 die "Undefined subroutine $AUTOLOAD called";
1071 }
9d2c6865 1072}
6e90668e 1073
611c1e95
IZ
1074sub DESTROY {} # Do not AUTOLOAD
1075
ce4e655d
RH
1076# $root should be the op which represents the root of whatever
1077# we're sequencing here. If it's undefined, then we don't append
1078# any subroutine declarations to the deparsed ops, otherwise we
1079# append appropriate declarations.
58cccf98 1080sub lineseq {
ce4e655d 1081 my($self, $root, @ops) = @_;
58cccf98 1082 my($expr, @exprs);
ce4e655d
RH
1083
1084 my $out_cop = $self->{'curcop'};
1085 my $out_seq = defined($out_cop) ? $out_cop->cop_seq : undef;
1086 my $limit_seq;
1087 if (defined $root) {
1088 $limit_seq = $out_seq;
1089 my $nseq = $self->find_scope_st($root->sibling) if ${$root->sibling};
1090 $limit_seq = $nseq if !defined($limit_seq)
1091 or defined($nseq) && $nseq < $limit_seq;
1092 }
1093 $limit_seq = $self->{'limit_seq'}
1094 if defined($self->{'limit_seq'})
1095 && (!defined($limit_seq) || $self->{'limit_seq'} < $limit_seq);
1096 local $self->{'limit_seq'} = $limit_seq;
58cccf98 1097 for (my $i = 0; $i < @ops; $i++) {
6e90668e 1098 $expr = "";
58cccf98
SM
1099 if (is_state $ops[$i]) {
1100 $expr = $self->deparse($ops[$i], 0);
1101 $i++;
e99ebc55
RH
1102 if ($i > $#ops) {
1103 push @exprs, $expr;
1104 last;
1105 }
58cccf98 1106 }
c73811ab
RH
1107 if (!is_state $ops[$i] and (my $ls = $ops[$i+1]) and
1108 !null($ops[$i+1]) and $ops[$i+1]->name eq "lineseq")
58cccf98 1109 {
c73811ab
RH
1110 if ($ls->first && !null($ls->first) && is_state($ls->first)
1111 && (my $sib = $ls->first->sibling)) {
1112 if (!null($sib) && $sib->name eq "leaveloop") {
1113 push @exprs, $expr . $self->for_loop($ops[$i], 0);
1114 $i++;
1115 next;
1116 }
1117 }
6e90668e 1118 }
d989cdac 1119 $expr .= $self->deparse($ops[$i], (@ops != 1)/2);
e99ebc55 1120 $expr =~ s/;\n?\z//;
f99a63a2 1121 push @exprs, $expr;
6e90668e 1122 }
ce4e655d
RH
1123 my $body = join(";\n", grep {length} @exprs);
1124 my $subs = "";
67fc2416 1125 if (defined $root && defined $limit_seq && !$self->{'in_format'}) {
ce4e655d
RH
1126 $subs = join "\n", $self->seq_subs($limit_seq);
1127 }
1128 return join(";\n", grep {length} $body, $subs);
6e90668e
SM
1129}
1130
58cccf98 1131sub scopeop {
d989cdac 1132 my($real_block, $self, $op, $cx) = @_;
58cccf98
SM
1133 my $kid;
1134 my @kids;
a0405c92
RH
1135
1136 local(@$self{qw'curstash warnings hints'})
1137 = @$self{qw'curstash warnings hints'} if $real_block;
58cccf98
SM
1138 if ($real_block) {
1139 $kid = $op->first->sibling; # skip enter
1140 if (is_miniwhile($kid)) {
1141 my $top = $kid->first;
1142 my $name = $top->name;
1143 if ($name eq "and") {
1144 $name = "while";
1145 } elsif ($name eq "or") {
1146 $name = "until";
1147 } else { # no conditional -> while 1 or until 0
1148 return $self->deparse($top->first, 1) . " while 1";
1149 }
1150 my $cond = $top->first;
1151 my $body = $cond->sibling->first; # skip lineseq
1152 $cond = $self->deparse($cond, 1);
1153 $body = $self->deparse($body, 1);
1154 return "$body $name $cond";
6e90668e 1155 }
58cccf98
SM
1156 } else {
1157 $kid = $op->first;
1158 }
1159 for (; !null($kid); $kid = $kid->sibling) {
1160 push @kids, $kid;
6e90668e 1161 }
d989cdac 1162 if ($cx > 0) { # inside an expression, (a do {} while for lineseq)
ce4e655d 1163 return "do {\n\t" . $self->lineseq($op, @kids) . "\n\b}";
9d2c6865 1164 } else {
ce4e655d 1165 my $lineseq = $self->lineseq($op, @kids);
7a9b44b9 1166 return (length ($lineseq) ? "$lineseq;" : "");
6e90668e 1167 }
6e90668e
SM
1168}
1169
ce4e655d 1170sub pp_scope { scopeop(0, @_); }
58cccf98
SM
1171sub pp_lineseq { scopeop(0, @_); }
1172sub pp_leave { scopeop(1, @_); }
9d2c6865 1173
d989cdac
SM
1174# This is a special case of scopeop and lineseq, for the case of the
1175# main_root. The difference is that we print the output statements as
1176# soon as we get them, for the sake of impatient users.
1177sub deparse_root {
1178 my $self = shift;
1179 my($op) = @_;
1180 local(@$self{qw'curstash warnings hints'})
1181 = @$self{qw'curstash warnings hints'};
1182 my @kids;
1183 for (my $kid = $op->first->sibling; !null($kid); $kid = $kid->sibling) {
1184 push @kids, $kid;
1185 }
1186 for (my $i = 0; $i < @kids; $i++) {
1187 my $expr = "";
1188 if (is_state $kids[$i]) {
1189 $expr = $self->deparse($kids[$i], 0);
1190 $i++;
1191 if ($i > $#kids) {
1192 print $self->indent($expr);
1193 last;
1194 }
1195 }
1196 if (is_for_loop($kids[$i])) {
1197 $expr .= $self->for_loop($kids[$i], 0);
1198 $expr .= ";\n" unless $i == $#kids;
1199 print $self->indent($expr);
1200 $i++;
1201 next;
1202 }
1203 $expr .= $self->deparse($kids[$i], (@kids != 1)/2);
1204 $expr =~ s/;\n?\z//;
1205 $expr .= ";";
1206 print $self->indent($expr);
1207 print "\n" unless $i == $#kids;
1208 }
1209}
1210
6e90668e
SM
1211# The BEGIN {} is used here because otherwise this code isn't executed
1212# when you run B::Deparse on itself.
1213my %globalnames;
1214BEGIN { map($globalnames{$_}++, "SIG", "STDIN", "STDOUT", "STDERR", "INC",
1215 "ENV", "ARGV", "ARGVOUT", "_"); }
1216
1217sub gv_name {
1218 my $self = shift;
1219 my $gv = shift;
c6e79e55 1220Carp::confess() unless ref($gv) eq "B::GV";
6e90668e 1221 my $stash = $gv->STASH->NAME;
d9963e60 1222 my $name = $gv->SAFENAME;
5c55e82c
HS
1223 if (($stash eq 'main' && $globalnames{$name})
1224 or ($stash eq $self->{'curstash'} && !$globalnames{$name})
9d2c6865
SM
1225 or $name =~ /^[^A-Za-z_]/)
1226 {
6e90668e
SM
1227 $stash = "";
1228 } else {
1229 $stash = $stash . "::";
a798dbf2 1230 }
083bda02
MS
1231 if ($name =~ /^(\^..|{)/) {
1232 $name = "{$name}"; # ${^WARNING_BITS}, etc and ${
6e90668e
SM
1233 }
1234 return $stash . $name;
a798dbf2
MB
1235}
1236
8510e997
RH
1237# Return the name to use for a stash variable.
1238# If a lexical with the same name is in scope, it may need to be
1239# fully-qualified.
1240sub stash_variable {
1241 my ($self, $prefix, $name) = @_;
1242
1243 return "$prefix$name" if $name =~ /::/;
1244
d989cdac 1245 unless ($prefix eq '$' || $prefix eq '@' || #'
8510e997
RH
1246 $prefix eq '%' || $prefix eq '$#') {
1247 return "$prefix$name";
1248 }
1249
1250 my $v = ($prefix eq '$#' ? '@' : $prefix) . $name;
1251 return $prefix .$self->{'curstash'}.'::'. $name if $self->lex_in_scope($v);
1252 return "$prefix$name";
1253}
1254
1255sub lex_in_scope {
1256 my ($self, $name) = @_;
1257 $self->populate_curcvlex() if !defined $self->{'curcvlex'};
1258
6ec152c3 1259 return 0 if !defined($self->{'curcop'});
8510e997
RH
1260 my $seq = $self->{'curcop'}->cop_seq;
1261 return 0 if !exists $self->{'curcvlex'}{$name};
1262 for my $a (@{$self->{'curcvlex'}{$name}}) {
1263 my ($st, $en) = @$a;
1264 return 1 if $seq > $st && $seq <= $en;
1265 }
1266 return 0;
1267}
1268
1269sub populate_curcvlex {
1270 my $self = shift;
ce4e655d 1271 for (my $cv = $self->{'curcv'}; class($cv) eq "CV"; $cv = $cv->OUTSIDE) {
7dafbf52
DM
1272 my $padlist = $cv->PADLIST;
1273 # an undef CV still in lexical chain
1274 next if class($padlist) eq "SPECIAL";
1275 my @padlist = $padlist->ARRAY;
8510e997
RH
1276 my @ns = $padlist[0]->ARRAY;
1277
1278 for (my $i=0; $i<@ns; ++$i) {
1279 next if class($ns[$i]) eq "SPECIAL";
ce4e655d 1280 next if $ns[$i]->FLAGS & SVpad_OUR; # Skip "our" vars
0f2fe21d
RH
1281 if (class($ns[$i]) eq "PV") {
1282 # Probably that pesky lexical @_
1283 next;
1284 }
8510e997 1285 my $name = $ns[$i]->PVX;
7dafbf52
DM
1286 my ($seq_st, $seq_en) =
1287 ($ns[$i]->FLAGS & SVf_FAKE)
1288 ? (0, 999999)
1289 : ($ns[$i]->NVX, $ns[$i]->IVX);
8510e997
RH
1290
1291 push @{$self->{'curcvlex'}{$name}}, [$seq_st, $seq_en];
1292 }
1293 }
1294}
1295
ce4e655d
RH
1296sub find_scope_st { ((find_scope(@_))[0]); }
1297sub find_scope_en { ((find_scope(@_))[1]); }
1298
1299# Recurses down the tree, looking for pad variable introductions and COPs
1300sub find_scope {
1301 my ($self, $op, $scope_st, $scope_en) = @_;
ff97752d 1302 carp("Undefined op in find_scope") if !defined $op;
ce4e655d
RH
1303 return ($scope_st, $scope_en) unless $op->flags & OPf_KIDS;
1304
1305 for (my $o=$op->first; $$o; $o=$o->sibling) {
1306 if ($o->name =~ /^pad.v$/ && $o->private & OPpLVAL_INTRO) {
1307 my $s = int($self->padname_sv($o->targ)->NVX);
1308 my $e = $self->padname_sv($o->targ)->IVX;
1309 $scope_st = $s if !defined($scope_st) || $s < $scope_st;
1310 $scope_en = $e if !defined($scope_en) || $e > $scope_en;
1311 }
1312 elsif (is_state($o)) {
1313 my $c = $o->cop_seq;
1314 $scope_st = $c if !defined($scope_st) || $c < $scope_st;
1315 $scope_en = $c if !defined($scope_en) || $c > $scope_en;
1316 }
1317 elsif ($o->flags & OPf_KIDS) {
1318 ($scope_st, $scope_en) =
1319 $self->find_scope($o, $scope_st, $scope_en)
34a48b4b
RH
1320 }
1321 }
ce4e655d
RH
1322
1323 return ($scope_st, $scope_en);
34a48b4b
RH
1324}
1325
1326# Returns a list of subs which should be inserted before the COP
1327sub cop_subs {
1328 my ($self, $op, $out_seq) = @_;
1329 my $seq = $op->cop_seq;
1330 # If we have nephews, then our sequence number indicates
1331 # the cop_seq of the end of some sort of scope.
1332 if (class($op->sibling) ne "NULL" && $op->sibling->flags & OPf_KIDS
ce4e655d
RH
1333 and my $nseq = $self->find_scope_st($op->sibling) ) {
1334 $seq = $nseq;
34a48b4b
RH
1335 }
1336 $seq = $out_seq if defined($out_seq) && $out_seq < $seq;
1337 return $self->seq_subs($seq);
1338}
1339
1340sub seq_subs {
1341 my ($self, $seq) = @_;
1342 my @text;
1343#push @text, "# ($seq)\n";
1344
ce4e655d 1345 return "" if !defined $seq;
34a48b4b
RH
1346 while (scalar(@{$self->{'subs_todo'}})
1347 and $seq > $self->{'subs_todo'}[0][0]) {
1348 push @text, $self->next_todo;
1349 }
1350 return @text;
1351}
1352
08c6f5ec 1353# Notice how subs and formats are inserted between statements here;
a0405c92 1354# also $[ assignments and pragmas.
6e90668e
SM
1355sub pp_nextstate {
1356 my $self = shift;
9d2c6865 1357 my($op, $cx) = @_;
34a48b4b 1358 $self->{'curcop'} = $op;
6e90668e 1359 my @text;
34a48b4b 1360 push @text, $self->cop_subs($op);
e99ebc55 1361 push @text, $op->label . ": " if $op->label;
11faa288 1362 my $stash = $op->stashpv;
6e90668e
SM
1363 if ($stash ne $self->{'curstash'}) {
1364 push @text, "package $stash;\n";
1365 $self->{'curstash'} = $stash;
1366 }
08c6f5ec 1367
7a9b44b9
RH
1368 if ($self->{'arybase'} != $op->arybase) {
1369 push @text, '$[ = '. $op->arybase .";\n";
1370 $self->{'arybase'} = $op->arybase;
1371 }
1372
1373 my $warnings = $op->warnings;
1374 my $warning_bits;
1375 if ($warnings->isa("B::SPECIAL") && $$warnings == 4) {
810aef70 1376 $warning_bits = $warnings::Bits{"all"} & WARN_MASK;
7a9b44b9 1377 }
e31885a0 1378 elsif ($warnings->isa("B::SPECIAL") && $$warnings == 5) {
810aef70 1379 $warning_bits = $warnings::NONE;
7a9b44b9 1380 }
e31885a0
RH
1381 elsif ($warnings->isa("B::SPECIAL")) {
1382 $warning_bits = undef;
1383 }
7a9b44b9 1384 else {
34a48b4b 1385 $warning_bits = $warnings->PV & WARN_MASK;
7a9b44b9
RH
1386 }
1387
e31885a0
RH
1388 if (defined ($warning_bits) and
1389 !defined($self->{warnings}) || $self->{'warnings'} ne $warning_bits) {
08c6f5ec 1390 push @text, declare_warnings($self->{'warnings'}, $warning_bits);
7a9b44b9
RH
1391 $self->{'warnings'} = $warning_bits;
1392 }
1393
a0405c92
RH
1394 if ($self->{'hints'} != $op->private) {
1395 push @text, declare_hints($self->{'hints'}, $op->private);
1396 $self->{'hints'} = $op->private;
1397 }
1398
d989cdac
SM
1399 # This should go after of any branches that add statements, to
1400 # increase the chances that it refers to the same line it did in
1401 # the original program.
1402 if ($self->{'linenums'}) {
1403 push @text, "\f#line " . $op->line .
1404 ' "' . $op->file, qq'"\n';
1405 }
1406
6e90668e
SM
1407 return join("", @text);
1408}
1409
08c6f5ec
RH
1410sub declare_warnings {
1411 my ($from, $to) = @_;
6ec152c3 1412 if (($to & WARN_MASK) eq warnings::bits("all")) {
a0405c92
RH
1413 return "use warnings;\n";
1414 }
6ec152c3 1415 elsif (($to & WARN_MASK) eq "\0"x length($to)) {
a0405c92
RH
1416 return "no warnings;\n";
1417 }
51a5edaf 1418 return "BEGIN {\${^WARNING_BITS} = ".perlstring($to)."}\n";
a0405c92
RH
1419}
1420
1421sub declare_hints {
1422 my ($from, $to) = @_;
a0035eb8
RH
1423 my $use = $to & ~$from;
1424 my $no = $from & ~$to;
1425 my $decls = "";
1426 for my $pragma (hint_pragmas($use)) {
1427 $decls .= "use $pragma;\n";
1428 }
1429 for my $pragma (hint_pragmas($no)) {
1430 $decls .= "no $pragma;\n";
1431 }
1432 return $decls;
1433}
1434
1435sub hint_pragmas {
1436 my ($bits) = @_;
1437 my @pragmas;
1438 push @pragmas, "integer" if $bits & 0x1;
1439 push @pragmas, "strict 'refs'" if $bits & 0x2;
1440 push @pragmas, "bytes" if $bits & 0x8;
1441 return @pragmas;
08c6f5ec
RH
1442}
1443
6e90668e 1444sub pp_dbstate { pp_nextstate(@_) }
3f872cb9 1445sub pp_setstate { pp_nextstate(@_) }
6e90668e
SM
1446
1447sub pp_unstack { return "" } # see also leaveloop
1448
1449sub baseop {
1450 my $self = shift;
9d2c6865 1451 my($op, $cx, $name) = @_;
6e90668e
SM
1452 return $name;
1453}
1454
e99ebc55
RH
1455sub pp_stub {
1456 my $self = shift;
1457 my($op, $cx, $name) = @_;
d989cdac 1458 if ($cx >= 1) {
e99ebc55
RH
1459 return "()";
1460 }
1461 else {
1462 return "();";
1463 }
1464}
6e90668e
SM
1465sub pp_wantarray { baseop(@_, "wantarray") }
1466sub pp_fork { baseop(@_, "fork") }
3ed82cfc
GS
1467sub pp_wait { maybe_targmy(@_, \&baseop, "wait") }
1468sub pp_getppid { maybe_targmy(@_, \&baseop, "getppid") }
1469sub pp_time { maybe_targmy(@_, \&baseop, "time") }
6e90668e
SM
1470sub pp_tms { baseop(@_, "times") }
1471sub pp_ghostent { baseop(@_, "gethostent") }
1472sub pp_gnetent { baseop(@_, "getnetent") }
1473sub pp_gprotoent { baseop(@_, "getprotoent") }
1474sub pp_gservent { baseop(@_, "getservent") }
1475sub pp_ehostent { baseop(@_, "endhostent") }
1476sub pp_enetent { baseop(@_, "endnetent") }
1477sub pp_eprotoent { baseop(@_, "endprotoent") }
1478sub pp_eservent { baseop(@_, "endservent") }
1479sub pp_gpwent { baseop(@_, "getpwent") }
1480sub pp_spwent { baseop(@_, "setpwent") }
1481sub pp_epwent { baseop(@_, "endpwent") }
1482sub pp_ggrent { baseop(@_, "getgrent") }
1483sub pp_sgrent { baseop(@_, "setgrent") }
1484sub pp_egrent { baseop(@_, "endgrent") }
1485sub pp_getlogin { baseop(@_, "getlogin") }
1486
1487sub POSTFIX () { 1 }
1488
9d2c6865
SM
1489# I couldn't think of a good short name, but this is the category of
1490# symbolic unary operators with interesting precedence
1491
1492sub pfixop {
1493 my $self = shift;
1494 my($op, $cx, $name, $prec, $flags) = (@_, 0);
1495 my $kid = $op->first;
1496 $kid = $self->deparse($kid, $prec);
1497 return $self->maybe_parens(($flags & POSTFIX) ? "$kid$name" : "$name$kid",
1498 $cx, $prec);
1499}
1500
1501sub pp_preinc { pfixop(@_, "++", 23) }
1502sub pp_predec { pfixop(@_, "--", 23) }
3ed82cfc
GS
1503sub pp_postinc { maybe_targmy(@_, \&pfixop, "++", 23, POSTFIX) }
1504sub pp_postdec { maybe_targmy(@_, \&pfixop, "--", 23, POSTFIX) }
9d2c6865
SM
1505sub pp_i_preinc { pfixop(@_, "++", 23) }
1506sub pp_i_predec { pfixop(@_, "--", 23) }
3ed82cfc
GS
1507sub pp_i_postinc { maybe_targmy(@_, \&pfixop, "++", 23, POSTFIX) }
1508sub pp_i_postdec { maybe_targmy(@_, \&pfixop, "--", 23, POSTFIX) }
68cc8748 1509sub pp_complement { maybe_targmy(@_, \&pfixop, "~", 21) }
9d2c6865 1510
3ed82cfc
GS
1511sub pp_negate { maybe_targmy(@_, \&real_negate) }
1512sub real_negate {
9d2c6865
SM
1513 my $self = shift;
1514 my($op, $cx) = @_;
3f872cb9 1515 if ($op->first->name =~ /^(i_)?negate$/) {
9d2c6865
SM
1516 # avoid --$x
1517 $self->pfixop($op, $cx, "-", 21.5);
1518 } else {
1519 $self->pfixop($op, $cx, "-", 21);
1520 }
1521}
1522sub pp_i_negate { pp_negate(@_) }
1523
1524sub pp_not {
1525 my $self = shift;
1526 my($op, $cx) = @_;
1527 if ($cx <= 4) {
1528 $self->pfixop($op, $cx, "not ", 4);
1529 } else {
1530 $self->pfixop($op, $cx, "!", 21);
1531 }
1532}
1533
6e90668e
SM
1534sub unop {
1535 my $self = shift;
f4a44678 1536 my($op, $cx, $name) = @_;
6e90668e 1537 my $kid;
9d2c6865 1538 if ($op->flags & OPf_KIDS) {
6e90668e 1539 $kid = $op->first;
d989cdac 1540 if (defined prototype("CORE::$name")
e31885a0
RH
1541 && prototype("CORE::$name") =~ /^;?\*/
1542 && $kid->name eq "rv2gv") {
1543 $kid = $kid->first;
1544 }
1545
9d2c6865 1546 return $self->maybe_parens_unop($name, $kid, $cx);
6e90668e 1547 } else {
d989cdac 1548 return $name . ($op->flags & OPf_SPECIAL ? "()" : "");
6e90668e 1549 }
6e90668e
SM
1550}
1551
3ed82cfc
GS
1552sub pp_chop { maybe_targmy(@_, \&unop, "chop") }
1553sub pp_chomp { maybe_targmy(@_, \&unop, "chomp") }
1554sub pp_schop { maybe_targmy(@_, \&unop, "chop") }
1555sub pp_schomp { maybe_targmy(@_, \&unop, "chomp") }
6e90668e
SM
1556sub pp_defined { unop(@_, "defined") }
1557sub pp_undef { unop(@_, "undef") }
1558sub pp_study { unop(@_, "study") }
6e90668e
SM
1559sub pp_ref { unop(@_, "ref") }
1560sub pp_pos { maybe_local(@_, unop(@_, "pos")) }
1561
3ed82cfc
GS
1562sub pp_sin { maybe_targmy(@_, \&unop, "sin") }
1563sub pp_cos { maybe_targmy(@_, \&unop, "cos") }
1564sub pp_rand { maybe_targmy(@_, \&unop, "rand") }
6e90668e 1565sub pp_srand { unop(@_, "srand") }
3ed82cfc
GS
1566sub pp_exp { maybe_targmy(@_, \&unop, "exp") }
1567sub pp_log { maybe_targmy(@_, \&unop, "log") }
1568sub pp_sqrt { maybe_targmy(@_, \&unop, "sqrt") }
1569sub pp_int { maybe_targmy(@_, \&unop, "int") }
1570sub pp_hex { maybe_targmy(@_, \&unop, "hex") }
1571sub pp_oct { maybe_targmy(@_, \&unop, "oct") }
1572sub pp_abs { maybe_targmy(@_, \&unop, "abs") }
1573
1574sub pp_length { maybe_targmy(@_, \&unop, "length") }
1575sub pp_ord { maybe_targmy(@_, \&unop, "ord") }
1576sub pp_chr { maybe_targmy(@_, \&unop, "chr") }
6e90668e
SM
1577
1578sub pp_each { unop(@_, "each") }
1579sub pp_values { unop(@_, "values") }
1580sub pp_keys { unop(@_, "keys") }
1581sub pp_pop { unop(@_, "pop") }
1582sub pp_shift { unop(@_, "shift") }
1583
1584sub pp_caller { unop(@_, "caller") }
1585sub pp_reset { unop(@_, "reset") }
1586sub pp_exit { unop(@_, "exit") }
1587sub pp_prototype { unop(@_, "prototype") }
1588
1589sub pp_close { unop(@_, "close") }
1590sub pp_fileno { unop(@_, "fileno") }
1591sub pp_umask { unop(@_, "umask") }
6e90668e
SM
1592sub pp_untie { unop(@_, "untie") }
1593sub pp_tied { unop(@_, "tied") }
1594sub pp_dbmclose { unop(@_, "dbmclose") }
1595sub pp_getc { unop(@_, "getc") }
1596sub pp_eof { unop(@_, "eof") }
1597sub pp_tell { unop(@_, "tell") }
1598sub pp_getsockname { unop(@_, "getsockname") }
1599sub pp_getpeername { unop(@_, "getpeername") }
1600
3ed82cfc
GS
1601sub pp_chdir { maybe_targmy(@_, \&unop, "chdir") }
1602sub pp_chroot { maybe_targmy(@_, \&unop, "chroot") }
6e90668e 1603sub pp_readlink { unop(@_, "readlink") }
3ed82cfc 1604sub pp_rmdir { maybe_targmy(@_, \&unop, "rmdir") }
6e90668e
SM
1605sub pp_readdir { unop(@_, "readdir") }
1606sub pp_telldir { unop(@_, "telldir") }
1607sub pp_rewinddir { unop(@_, "rewinddir") }
1608sub pp_closedir { unop(@_, "closedir") }
3ed82cfc 1609sub pp_getpgrp { maybe_targmy(@_, \&unop, "getpgrp") }
6e90668e
SM
1610sub pp_localtime { unop(@_, "localtime") }
1611sub pp_gmtime { unop(@_, "gmtime") }
1612sub pp_alarm { unop(@_, "alarm") }
3ed82cfc 1613sub pp_sleep { maybe_targmy(@_, \&unop, "sleep") }
6e90668e
SM
1614
1615sub pp_dofile { unop(@_, "do") }
1616sub pp_entereval { unop(@_, "eval") }
1617
1618sub pp_ghbyname { unop(@_, "gethostbyname") }
1619sub pp_gnbyname { unop(@_, "getnetbyname") }
1620sub pp_gpbyname { unop(@_, "getprotobyname") }
1621sub pp_shostent { unop(@_, "sethostent") }
1622sub pp_snetent { unop(@_, "setnetent") }
1623sub pp_sprotoent { unop(@_, "setprotoent") }
1624sub pp_sservent { unop(@_, "setservent") }
1625sub pp_gpwnam { unop(@_, "getpwnam") }
1626sub pp_gpwuid { unop(@_, "getpwuid") }
1627sub pp_ggrnam { unop(@_, "getgrnam") }
1628sub pp_ggrgid { unop(@_, "getgrgid") }
1629
1630sub pp_lock { unop(@_, "lock") }
1631
1632sub pp_exists {
1633 my $self = shift;
9d2c6865 1634 my($op, $cx) = @_;
34a48b4b
RH
1635 my $arg;
1636 if ($op->private & OPpEXISTS_SUB) {
1637 # Checking for the existence of a subroutine
1638 return $self->maybe_parens_func("exists",
1639 $self->pp_rv2cv($op->first, 16), $cx, 16);
1640 }
1641 if ($op->flags & OPf_SPECIAL) {
1642 # Array element, not hash element
1643 return $self->maybe_parens_func("exists",
1644 $self->pp_aelem($op->first, 16), $cx, 16);
1645 }
9d2c6865
SM
1646 return $self->maybe_parens_func("exists", $self->pp_helem($op->first, 16),
1647 $cx, 16);
6e90668e
SM
1648}
1649
6e90668e
SM
1650sub pp_delete {
1651 my $self = shift;
9d2c6865 1652 my($op, $cx) = @_;
6e90668e
SM
1653 my $arg;
1654 if ($op->private & OPpSLICE) {
34a48b4b
RH
1655 if ($op->flags & OPf_SPECIAL) {
1656 # Deleting from an array, not a hash
1657 return $self->maybe_parens_func("delete",
1658 $self->pp_aslice($op->first, 16),
1659 $cx, 16);
1660 }
9d2c6865
SM
1661 return $self->maybe_parens_func("delete",
1662 $self->pp_hslice($op->first, 16),
1663 $cx, 16);
6e90668e 1664 } else {
34a48b4b
RH
1665 if ($op->flags & OPf_SPECIAL) {
1666 # Deleting from an array, not a hash
1667 return $self->maybe_parens_func("delete",
1668 $self->pp_aelem($op->first, 16),
1669 $cx, 16);
1670 }
9d2c6865
SM
1671 return $self->maybe_parens_func("delete",
1672 $self->pp_helem($op->first, 16),
1673 $cx, 16);
6e90668e 1674 }
6e90668e
SM
1675}
1676
6e90668e
SM
1677sub pp_require {
1678 my $self = shift;
9d2c6865 1679 my($op, $cx) = @_;
3f872cb9 1680 if (class($op) eq "UNOP" and $op->first->name eq "const"
4c1f658f 1681 and $op->first->private & OPpCONST_BARE)
6e90668e 1682 {
18228111 1683 my $name = $self->const_sv($op->first)->PV;
6e90668e
SM
1684 $name =~ s[/][::]g;
1685 $name =~ s/\.pm//g;
34a48b4b 1686 return "require $name";
6e90668e 1687 } else {
9d2c6865 1688 $self->unop($op, $cx, "require");
6e90668e
SM
1689 }
1690}
1691
d989cdac 1692sub pp_scalar {
9d2c6865
SM
1693 my $self = shift;
1694 my($op, $cv) = @_;
1695 my $kid = $op->first;
1696 if (not null $kid->sibling) {
1697 # XXX Was a here-doc
1698 return $self->dquote($op);
1699 }
1700 $self->unop(@_, "scalar");
1701}
1702
1703
6e90668e
SM
1704sub padval {
1705 my $self = shift;
1706 my $targ = shift;
d989cdac 1707 return $self->{'curcv'}->PADLIST->ARRAYelt(1)->ARRAYelt($targ);
6e90668e
SM
1708}
1709
1710sub pp_refgen {
1711 my $self = shift;
9d2c6865 1712 my($op, $cx) = @_;
6e90668e 1713 my $kid = $op->first;
3f872cb9 1714 if ($kid->name eq "null") {
6e90668e 1715 $kid = $kid->first;
3f872cb9
GS
1716 if ($kid->name eq "anonlist" || $kid->name eq "anonhash") {
1717 my($pre, $post) = @{{"anonlist" => ["[","]"],
1718 "anonhash" => ["{","}"]}->{$kid->name}};
6e90668e
SM
1719 my($expr, @exprs);
1720 $kid = $kid->first->sibling; # skip pushmark
1721 for (; !null($kid); $kid = $kid->sibling) {
9d2c6865 1722 $expr = $self->deparse($kid, 6);
6e90668e
SM
1723 push @exprs, $expr;
1724 }
1725 return $pre . join(", ", @exprs) . $post;
d989cdac 1726 } elsif (!null($kid->sibling) and
3f872cb9 1727 $kid->sibling->name eq "anoncode") {
6e90668e
SM
1728 return "sub " .
1729 $self->deparse_sub($self->padval($kid->sibling->targ));
3f872cb9
GS
1730 } elsif ($kid->name eq "pushmark") {
1731 my $sib_name = $kid->sibling->name;
1732 if ($sib_name =~ /^(pad|rv2)[ah]v$/
c8c62db7
AD
1733 and not $kid->sibling->flags & OPf_REF)
1734 {
1735 # The @a in \(@a) isn't in ref context, but only when the
1736 # parens are there.
127212b2 1737 return "\\(" . $self->pp_list($op->first) . ")";
3f872cb9 1738 } elsif ($sib_name eq 'entersub') {
c8c62db7
AD
1739 my $text = $self->deparse($kid->sibling, 1);
1740 # Always show parens for \(&func()), but only with -p otherwise
1741 $text = "($text)" if $self->{'parens'}
1742 or $kid->sibling->private & OPpENTERSUB_AMPER;
1743 return "\\$text";
1744 }
1745 }
6e90668e 1746 }
9d2c6865 1747 $self->pfixop($op, $cx, "\\", 20);
6e90668e
SM
1748}
1749
1750sub pp_srefgen { pp_refgen(@_) }
1751
1752sub pp_readline {
1753 my $self = shift;
9d2c6865 1754 my($op, $cx) = @_;
6e90668e 1755 my $kid = $op->first;
3f872cb9 1756 $kid = $kid->first if $kid->name eq "rv2gv"; # <$fh>
e31885a0
RH
1757 return "<" . $self->deparse($kid, 1) . ">" if is_scalar($kid);
1758 return $self->unop($op, $cx, "readline");
6e90668e
SM
1759}
1760
ad8caead
RGS
1761sub pp_rcatline {
1762 my $self = shift;
1763 my($op) = @_;
d989cdac 1764 return "<" . $self->gv_name($self->gv_or_padgv($op)) . ">";
ad8caead
RGS
1765}
1766
bd0865ec
GS
1767# Unary operators that can occur as pseudo-listops inside double quotes
1768sub dq_unop {
1769 my $self = shift;
1770 my($op, $cx, $name, $prec, $flags) = (@_, 0, 0);
1771 my $kid;
1772 if ($op->flags & OPf_KIDS) {
1773 $kid = $op->first;
1774 # If there's more than one kid, the first is an ex-pushmark.
1775 $kid = $kid->sibling if not null $kid->sibling;
1776 return $self->maybe_parens_unop($name, $kid, $cx);
1777 } else {
d989cdac 1778 return $name . ($op->flags & OPf_SPECIAL ? "()" : "");
bd0865ec
GS
1779 }
1780}
1781
1782sub pp_ucfirst { dq_unop(@_, "ucfirst") }
1783sub pp_lcfirst { dq_unop(@_, "lcfirst") }
1784sub pp_uc { dq_unop(@_, "uc") }
1785sub pp_lc { dq_unop(@_, "lc") }
3ed82cfc 1786sub pp_quotemeta { maybe_targmy(@_, \&dq_unop, "quotemeta") }
bd0865ec 1787
6e90668e
SM
1788sub loopex {
1789 my $self = shift;
9d2c6865 1790 my ($op, $cx, $name) = @_;
6e90668e 1791 if (class($op) eq "PVOP") {
9d2c6865
SM
1792 return "$name " . $op->pv;
1793 } elsif (class($op) eq "OP") {
1794 return $name;
6e90668e 1795 } elsif (class($op) eq "UNOP") {
9d2c6865
SM
1796 # Note -- loop exits are actually exempt from the
1797 # looks-like-a-func rule, but a few extra parens won't hurt
1798 return $self->maybe_parens_unop($name, $op->first, $cx);
6e90668e 1799 }
6e90668e
SM
1800}
1801
1802sub pp_last { loopex(@_, "last") }
1803sub pp_next { loopex(@_, "next") }
1804sub pp_redo { loopex(@_, "redo") }
1805sub pp_goto { loopex(@_, "goto") }
1806sub pp_dump { loopex(@_, "dump") }
1807
1808sub ftst {
1809 my $self = shift;
9d2c6865 1810 my($op, $cx, $name) = @_;
6e90668e 1811 if (class($op) eq "UNOP") {
9d2c6865
SM
1812 # Genuine `-X' filetests are exempt from the LLAFR, but not
1813 # l?stat(); for the sake of clarity, give'em all parens
1814 return $self->maybe_parens_unop($name, $op->first, $cx);
d989cdac 1815 } elsif (class($op) =~ /^(SV|PAD)OP$/) {
9d2c6865 1816 return $self->maybe_parens_func($name, $self->pp_gv($op, 1), $cx, 16);
6e90668e 1817 } else { # I don't think baseop filetests ever survive ck_ftst, but...
9d2c6865 1818 return $name;
6e90668e 1819 }
6e90668e
SM
1820}
1821
d989cdac
SM
1822sub pp_lstat { ftst(@_, "lstat") }
1823sub pp_stat { ftst(@_, "stat") }
1824sub pp_ftrread { ftst(@_, "-R") }
6e90668e 1825sub pp_ftrwrite { ftst(@_, "-W") }
d989cdac
SM
1826sub pp_ftrexec { ftst(@_, "-X") }
1827sub pp_fteread { ftst(@_, "-r") }
e31885a0 1828sub pp_ftewrite { ftst(@_, "-w") }
d989cdac
SM
1829sub pp_fteexec { ftst(@_, "-x") }
1830sub pp_ftis { ftst(@_, "-e") }
6e90668e
SM
1831sub pp_fteowned { ftst(@_, "-O") }
1832sub pp_ftrowned { ftst(@_, "-o") }
d989cdac
SM
1833sub pp_ftzero { ftst(@_, "-z") }
1834sub pp_ftsize { ftst(@_, "-s") }
1835sub pp_ftmtime { ftst(@_, "-M") }
1836sub pp_ftatime { ftst(@_, "-A") }
1837sub pp_ftctime { ftst(@_, "-C") }
1838sub pp_ftsock { ftst(@_, "-S") }
1839sub pp_ftchr { ftst(@_, "-c") }
1840sub pp_ftblk { ftst(@_, "-b") }
1841sub pp_ftfile { ftst(@_, "-f") }
1842sub pp_ftdir { ftst(@_, "-d") }
1843sub pp_ftpipe { ftst(@_, "-p") }
1844sub pp_ftlink { ftst(@_, "-l") }
1845sub pp_ftsuid { ftst(@_, "-u") }
1846sub pp_ftsgid { ftst(@_, "-g") }
1847sub pp_ftsvtx { ftst(@_, "-k") }
1848sub pp_fttty { ftst(@_, "-t") }
1849sub pp_fttext { ftst(@_, "-T") }
6e90668e
SM
1850sub pp_ftbinary { ftst(@_, "-B") }
1851
a798dbf2 1852sub SWAP_CHILDREN () { 1 }
6e90668e 1853sub ASSIGN () { 2 } # has OP= variant
7013e6ae 1854sub LIST_CONTEXT () { 4 } # Assignment is in list context
6e90668e 1855
9d2c6865
SM
1856my(%left, %right);
1857
1858sub assoc_class {
1859 my $op = shift;
3f872cb9
GS
1860 my $name = $op->name;
1861 if ($name eq "concat" and $op->first->name eq "concat") {
9d2c6865 1862 # avoid spurious `=' -- see comment in pp_concat
3f872cb9 1863 return "concat";
9d2c6865 1864 }
3f872cb9
GS
1865 if ($name eq "null" and class($op) eq "UNOP"
1866 and $op->first->name =~ /^(and|x?or)$/
9d2c6865
SM
1867 and null $op->first->sibling)
1868 {
1869 # Like all conditional constructs, OP_ANDs and OP_ORs are topped
1870 # with a null that's used as the common end point of the two
1871 # flows of control. For precedence purposes, ignore it.
1872 # (COND_EXPRs have these too, but we don't bother with
1873 # their associativity).
1874 return assoc_class($op->first);
1875 }
1876 return $name . ($op->flags & OPf_STACKED ? "=" : "");
1877}
1878
1879# Left associative operators, like `+', for which
1880# $a + $b + $c is equivalent to ($a + $b) + $c
1881
1882BEGIN {
3f872cb9
GS
1883 %left = ('multiply' => 19, 'i_multiply' => 19,
1884 'divide' => 19, 'i_divide' => 19,
1885 'modulo' => 19, 'i_modulo' => 19,
1886 'repeat' => 19,
1887 'add' => 18, 'i_add' => 18,
1888 'subtract' => 18, 'i_subtract' => 18,
1889 'concat' => 18,
1890 'left_shift' => 17, 'right_shift' => 17,
1891 'bit_and' => 13,
1892 'bit_or' => 12, 'bit_xor' => 12,
1893 'and' => 3,
1894 'or' => 2, 'xor' => 2,
9d2c6865
SM
1895 );
1896}
1897
1898sub deparse_binop_left {
1899 my $self = shift;
1900 my($op, $left, $prec) = @_;
58231d39 1901 if ($left{assoc_class($op)} && $left{assoc_class($left)}
9d2c6865
SM
1902 and $left{assoc_class($op)} == $left{assoc_class($left)})
1903 {
1904 return $self->deparse($left, $prec - .00001);
1905 } else {
1906 return $self->deparse($left, $prec);
1907 }
1908}
1909
1910# Right associative operators, like `=', for which
1911# $a = $b = $c is equivalent to $a = ($b = $c)
1912
1913BEGIN {
3f872cb9
GS
1914 %right = ('pow' => 22,
1915 'sassign=' => 7, 'aassign=' => 7,
1916 'multiply=' => 7, 'i_multiply=' => 7,
1917 'divide=' => 7, 'i_divide=' => 7,
1918 'modulo=' => 7, 'i_modulo=' => 7,
1919 'repeat=' => 7,
1920 'add=' => 7, 'i_add=' => 7,
1921 'subtract=' => 7, 'i_subtract=' => 7,
1922 'concat=' => 7,
1923 'left_shift=' => 7, 'right_shift=' => 7,
1924 'bit_and=' => 7,
1925 'bit_or=' => 7, 'bit_xor=' => 7,
1926 'andassign' => 7,
1927 'orassign' => 7,
9d2c6865
SM
1928 );
1929}
1930
1931sub deparse_binop_right {
1932 my $self = shift;
1933 my($op, $right, $prec) = @_;
58231d39 1934 if ($right{assoc_class($op)} && $right{assoc_class($right)}
9d2c6865
SM
1935 and $right{assoc_class($op)} == $right{assoc_class($right)})
1936 {
1937 return $self->deparse($right, $prec - .00001);
1938 } else {
1939 return $self->deparse($right, $prec);
1940 }
1941}
1942
a798dbf2 1943sub binop {
6e90668e 1944 my $self = shift;
9d2c6865 1945 my ($op, $cx, $opname, $prec, $flags) = (@_, 0);
a798dbf2
MB
1946 my $left = $op->first;
1947 my $right = $op->last;
9d2c6865
SM
1948 my $eq = "";
1949 if ($op->flags & OPf_STACKED && $flags & ASSIGN) {
1950 $eq = "=";
1951 $prec = 7;
1952 }
a798dbf2
MB
1953 if ($flags & SWAP_CHILDREN) {
1954 ($left, $right) = ($right, $left);
1955 }
9d2c6865 1956 $left = $self->deparse_binop_left($op, $left, $prec);
90c0eb26
RH
1957 $left = "($left)" if $flags & LIST_CONTEXT
1958 && $left !~ /^(my|our|local|)[\@\(]/;
9d2c6865
SM
1959 $right = $self->deparse_binop_right($op, $right, $prec);
1960 return $self->maybe_parens("$left $opname$eq $right", $cx, $prec);
1961}
1962
3ed82cfc
GS
1963sub pp_add { maybe_targmy(@_, \&binop, "+", 18, ASSIGN) }
1964sub pp_multiply { maybe_targmy(@_, \&binop, "*", 19, ASSIGN) }
1965sub pp_subtract { maybe_targmy(@_, \&binop, "-",18, ASSIGN) }
1966sub pp_divide { maybe_targmy(@_, \&binop, "/", 19, ASSIGN) }
1967sub pp_modulo { maybe_targmy(@_, \&binop, "%", 19, ASSIGN) }
1968sub pp_i_add { maybe_targmy(@_, \&binop, "+", 18, ASSIGN) }
1969sub pp_i_multiply { maybe_targmy(@_, \&binop, "*", 19, ASSIGN) }
1970sub pp_i_subtract { maybe_targmy(@_, \&binop, "-", 18, ASSIGN) }
1971sub pp_i_divide { maybe_targmy(@_, \&binop, "/", 19, ASSIGN) }
1972sub pp_i_modulo { maybe_targmy(@_, \&binop, "%", 19, ASSIGN) }
1973sub pp_pow { maybe_targmy(@_, \&binop, "**", 22, ASSIGN) }
1974
1975sub pp_left_shift { maybe_targmy(@_, \&binop, "<<", 17, ASSIGN) }
1976sub pp_right_shift { maybe_targmy(@_, \&binop, ">>", 17, ASSIGN) }
1977sub pp_bit_and { maybe_targmy(@_, \&binop, "&", 13, ASSIGN) }
1978sub pp_bit_or { maybe_targmy(@_, \&binop, "|", 12, ASSIGN) }
1979sub pp_bit_xor { maybe_targmy(@_, \&binop, "^", 12, ASSIGN) }
9d2c6865
SM
1980
1981sub pp_eq { binop(@_, "==", 14) }
1982sub pp_ne { binop(@_, "!=", 14) }
1983sub pp_lt { binop(@_, "<", 15) }
1984sub pp_gt { binop(@_, ">", 15) }
1985sub pp_ge { binop(@_, ">=", 15) }
1986sub pp_le { binop(@_, "<=", 15) }
1987sub pp_ncmp { binop(@_, "<=>", 14) }
1988sub pp_i_eq { binop(@_, "==", 14) }
1989sub pp_i_ne { binop(@_, "!=", 14) }
1990sub pp_i_lt { binop(@_, "<", 15) }
1991sub pp_i_gt { binop(@_, ">", 15) }
1992sub pp_i_ge { binop(@_, ">=", 15) }
1993sub pp_i_le { binop(@_, "<=", 15) }
1994sub pp_i_ncmp { binop(@_, "<=>", 14) }
1995
1996sub pp_seq { binop(@_, "eq", 14) }
1997sub pp_sne { binop(@_, "ne", 14) }
1998sub pp_slt { binop(@_, "lt", 15) }
1999sub pp_sgt { binop(@_, "gt", 15) }
2000sub pp_sge { binop(@_, "ge", 15) }
2001sub pp_sle { binop(@_, "le", 15) }
2002sub pp_scmp { binop(@_, "cmp", 14) }
2003
2004sub pp_sassign { binop(@_, "=", 7, SWAP_CHILDREN) }
7013e6ae 2005sub pp_aassign { binop(@_, "=", 7, SWAP_CHILDREN | LIST_CONTEXT) }
6e90668e
SM
2006
2007# `.' is special because concats-of-concats are optimized to save copying
2008# by making all but the first concat stacked. The effect is as if the
2009# programmer had written `($a . $b) .= $c', except legal.
3ed82cfc
GS
2010sub pp_concat { maybe_targmy(@_, \&real_concat) }
2011sub real_concat {
6e90668e 2012 my $self = shift;
9d2c6865 2013 my($op, $cx) = @_;
6e90668e
SM
2014 my $left = $op->first;
2015 my $right = $op->last;
2016 my $eq = "";
9d2c6865 2017 my $prec = 18;
3f872cb9 2018 if ($op->flags & OPf_STACKED and $op->first->name ne "concat") {
6e90668e 2019 $eq = "=";
9d2c6865 2020 $prec = 7;
6e90668e 2021 }
9d2c6865
SM
2022 $left = $self->deparse_binop_left($op, $left, $prec);
2023 $right = $self->deparse_binop_right($op, $right, $prec);
2024 return $self->maybe_parens("$left .$eq $right", $cx, $prec);
6e90668e
SM
2025}
2026
2027# `x' is weird when the left arg is a list
2028sub pp_repeat {
2029 my $self = shift;
9d2c6865 2030 my($op, $cx) = @_;
6e90668e
SM
2031 my $left = $op->first;
2032 my $right = $op->last;
9d2c6865
SM
2033 my $eq = "";
2034 my $prec = 19;
2035 if ($op->flags & OPf_STACKED) {
2036 $eq = "=";
2037 $prec = 7;
2038 }
6e90668e
SM
2039 if (null($right)) { # list repeat; count is inside left-side ex-list
2040 my $kid = $left->first->sibling; # skip pushmark
2041 my @exprs;
2042 for (; !null($kid->sibling); $kid = $kid->sibling) {
9d2c6865 2043 push @exprs, $self->deparse($kid, 6);
6e90668e
SM
2044 }
2045 $right = $kid;
2046 $left = "(" . join(", ", @exprs). ")";
2047 } else {
9d2c6865 2048 $left = $self->deparse_binop_left($op, $left, $prec);
6e90668e 2049 }
9d2c6865
SM
2050 $right = $self->deparse_binop_right($op, $right, $prec);
2051 return $self->maybe_parens("$left x$eq $right", $cx, $prec);
6e90668e
SM
2052}
2053
2054sub range {
2055 my $self = shift;
9d2c6865 2056 my ($op, $cx, $type) = @_;
6e90668e
SM
2057 my $left = $op->first;
2058 my $right = $left->sibling;
9d2c6865
SM
2059 $left = $self->deparse($left, 9);
2060 $right = $self->deparse($right, 9);
2061 return $self->maybe_parens("$left $type $right", $cx, 9);
6e90668e
SM
2062}
2063
2064sub pp_flop {
2065 my $self = shift;
9d2c6865 2066 my($op, $cx) = @_;
6e90668e
SM
2067 my $flip = $op->first;
2068 my $type = ($flip->flags & OPf_SPECIAL) ? "..." : "..";
9d2c6865 2069 return $self->range($flip->first, $cx, $type);
6e90668e
SM
2070}
2071
2072# one-line while/until is handled in pp_leave
2073
2074sub logop {
2075 my $self = shift;
9d2c6865 2076 my ($op, $cx, $lowop, $lowprec, $highop, $highprec, $blockname) = @_;
6e90668e
SM
2077 my $left = $op->first;
2078 my $right = $op->first->sibling;
d989cdac 2079 if ($cx < 1 and is_scope($right) and $blockname
58cccf98
SM
2080 and $self->{'expand'} < 7)
2081 { # if ($a) {$b}
9d2c6865
SM
2082 $left = $self->deparse($left, 1);
2083 $right = $self->deparse($right, 0);
2084 return "$blockname ($left) {\n\t$right\n\b}\cK";
d989cdac 2085 } elsif ($cx < 1 and $blockname and not $self->{'parens'}
58cccf98 2086 and $self->{'expand'} < 7) { # $b if $a
9d2c6865
SM
2087 $right = $self->deparse($right, 1);
2088 $left = $self->deparse($left, 1);
2089 return "$right $blockname $left";
2090 } elsif ($cx > $lowprec and $highop) { # $a && $b
2091 $left = $self->deparse_binop_left($op, $left, $highprec);
2092 $right = $self->deparse_binop_right($op, $right, $highprec);
2093 return $self->maybe_parens("$left $highop $right", $cx, $highprec);
2094 } else { # $a and $b
2095 $left = $self->deparse_binop_left($op, $left, $lowprec);
2096 $right = $self->deparse_binop_right($op, $right, $lowprec);
d989cdac 2097 return $self->maybe_parens("$left $lowop $right", $cx, $lowprec);
9d2c6865
SM
2098 }
2099}
2100
2101sub pp_and { logop(@_, "and", 3, "&&", 11, "if") }
f4a44678 2102sub pp_or { logop(@_, "or", 2, "||", 10, "unless") }
c963b151 2103sub pp_dor { logop(@_, "err", 2, "//", 10, "") }
3ed82cfc
GS
2104
2105# xor is syntactically a logop, but it's really a binop (contrary to
2106# old versions of opcode.pl). Syntax is what matters here.
9d2c6865 2107sub pp_xor { logop(@_, "xor", 2, "", 0, "") }
6e90668e
SM
2108
2109sub logassignop {
2110 my $self = shift;
9d2c6865 2111 my ($op, $cx, $opname) = @_;
6e90668e
SM
2112 my $left = $op->first;
2113 my $right = $op->first->sibling->first; # skip sassign
9d2c6865
SM
2114 $left = $self->deparse($left, 7);
2115 $right = $self->deparse($right, 7);
2116 return $self->maybe_parens("$left $opname $right", $cx, 7);
a798dbf2
MB
2117}
2118
6e90668e 2119sub pp_andassign { logassignop(@_, "&&=") }
c963b151
BD
2120sub pp_orassign { logassignop(@_, "||=") }
2121sub pp_dorassign { logassignop(@_, "//=") }
6e90668e
SM
2122
2123sub listop {
2124 my $self = shift;
9d2c6865
SM
2125 my($op, $cx, $name) = @_;
2126 my(@exprs);
2127 my $parens = ($cx >= 5) || $self->{'parens'};
2128 my $kid = $op->first->sibling;
2129 return $name if null $kid;
e31885a0 2130 my $first;
fb725297 2131 $name = "socketpair" if $name eq "sockpair";
e31885a0
RH
2132 if (defined prototype("CORE::$name")
2133 && prototype("CORE::$name") =~ /^;?\*/
2134 && $kid->name eq "rv2gv") {
2135 $first = $self->deparse($kid->first, 6);
2136 }
2137 else {
2138 $first = $self->deparse($kid, 6);
2139 }
e99ebc55 2140 if ($name eq "chmod" && $first =~ /^\d+$/) {
a0035eb8 2141 $first = sprintf("%#o", $first);
e99ebc55 2142 }
9d2c6865
SM
2143 $first = "+$first" if not $parens and substr($first, 0, 1) eq "(";
2144 push @exprs, $first;
2145 $kid = $kid->sibling;
2146 for (; !null($kid); $kid = $kid->sibling) {
2147 push @exprs, $self->deparse($kid, 6);
2148 }
2149 if ($parens) {
2150 return "$name(" . join(", ", @exprs) . ")";
2151 } else {
2152 return "$name " . join(", ", @exprs);
6e90668e 2153 }
6e90668e 2154}
a798dbf2 2155
6e90668e 2156sub pp_bless { listop(@_, "bless") }
3ed82cfc 2157sub pp_atan2 { maybe_targmy(@_, \&listop, "atan2") }
6e90668e
SM
2158sub pp_substr { maybe_local(@_, listop(@_, "substr")) }
2159sub pp_vec { maybe_local(@_, listop(@_, "vec")) }
3ed82cfc
GS
2160sub pp_index { maybe_targmy(@_, \&listop, "index") }
2161sub pp_rindex { maybe_targmy(@_, \&listop, "rindex") }
2162sub pp_sprintf { maybe_targmy(@_, \&listop, "sprintf") }
6e90668e 2163sub pp_formline { listop(@_, "formline") } # see also deparse_format
3ed82cfc 2164sub pp_crypt { maybe_targmy(@_, \&listop, "crypt") }
6e90668e
SM
2165sub pp_unpack { listop(@_, "unpack") }
2166sub pp_pack { listop(@_, "pack") }
3ed82cfc 2167sub pp_join { maybe_targmy(@_, \&listop, "join") }
6e90668e 2168sub pp_splice { listop(@_, "splice") }
3ed82cfc
GS
2169sub pp_push { maybe_targmy(@_, \&listop, "push") }
2170sub pp_unshift { maybe_targmy(@_, \&listop, "unshift") }
6e90668e
SM
2171sub pp_reverse { listop(@_, "reverse") }
2172sub pp_warn { listop(@_, "warn") }
2173sub pp_die { listop(@_, "die") }
9d2c6865
SM
2174# Actually, return is exempt from the LLAFR (see examples in this very
2175# module!), but for consistency's sake, ignore that fact
6e90668e
SM
2176sub pp_return { listop(@_, "return") }
2177sub pp_open { listop(@_, "open") }
2178sub pp_pipe_op { listop(@_, "pipe") }
2179sub pp_tie { listop(@_, "tie") }
82bafd27 2180sub pp_binmode { listop(@_, "binmode") }
6e90668e
SM
2181sub pp_dbmopen { listop(@_, "dbmopen") }
2182sub pp_sselect { listop(@_, "select") }
2183sub pp_select { listop(@_, "select") }
2184sub pp_read { listop(@_, "read") }
2185sub pp_sysopen { listop(@_, "sysopen") }
2186sub pp_sysseek { listop(@_, "sysseek") }
2187sub pp_sysread { listop(@_, "sysread") }
2188sub pp_syswrite { listop(@_, "syswrite") }
2189sub pp_send { listop(@_, "send") }
2190sub pp_recv { listop(@_, "recv") }
2191sub pp_seek { listop(@_, "seek") }
6e90668e
SM
2192sub pp_fcntl { listop(@_, "fcntl") }
2193sub pp_ioctl { listop(@_, "ioctl") }
3ed82cfc 2194sub pp_flock { maybe_targmy(@_, \&listop, "flock") }
6e90668e
SM
2195sub pp_socket { listop(@_, "socket") }
2196sub pp_sockpair { listop(@_, "sockpair") }
2197sub pp_bind { listop(@_, "bind") }
2198sub pp_connect { listop(@_, "connect") }
2199sub pp_listen { listop(@_, "listen") }
2200sub pp_accept { listop(@_, "accept") }
2201sub pp_shutdown { listop(@_, "shutdown") }
2202sub pp_gsockopt { listop(@_, "getsockopt") }
2203sub pp_ssockopt { listop(@_, "setsockopt") }
3ed82cfc
GS
2204sub pp_chown { maybe_targmy(@_, \&listop, "chown") }
2205sub pp_unlink { maybe_targmy(@_, \&listop, "unlink") }
2206sub pp_chmod { maybe_targmy(@_, \&listop, "chmod") }
2207sub pp_utime { maybe_targmy(@_, \&listop, "utime") }
2208sub pp_rename { maybe_targmy(@_, \&listop, "rename") }
2209sub pp_link { maybe_targmy(@_, \&listop, "link") }
2210sub pp_symlink { maybe_targmy(@_, \&listop, "symlink") }
2211sub pp_mkdir { maybe_targmy(@_, \&listop, "mkdir") }
6e90668e
SM
2212sub pp_open_dir { listop(@_, "opendir") }
2213sub pp_seekdir { listop(@_, "seekdir") }
3ed82cfc
GS
2214sub pp_waitpid { maybe_targmy(@_, \&listop, "waitpid") }
2215sub pp_system { maybe_targmy(@_, \&listop, "system") }
2216sub pp_exec { maybe_targmy(@_, \&listop, "exec") }
2217sub pp_kill { maybe_targmy(@_, \&listop, "kill") }
2218sub pp_setpgrp { maybe_targmy(@_, \&listop, "setpgrp") }
2219sub pp_getpriority { maybe_targmy(@_, \&listop, "getpriority") }
2220sub pp_setpriority { maybe_targmy(@_, \&listop, "setpriority") }
6e90668e
SM
2221sub pp_shmget { listop(@_, "shmget") }
2222sub pp_shmctl { listop(@_, "shmctl") }
2223sub pp_shmread { listop(@_, "shmread") }
2224sub pp_shmwrite { listop(@_, "shmwrite") }
2225sub pp_msgget { listop(@_, "msgget") }
2226sub pp_msgctl { listop(@_, "msgctl") }
2227sub pp_msgsnd { listop(@_, "msgsnd") }
2228sub pp_msgrcv { listop(@_, "msgrcv") }
2229sub pp_semget { listop(@_, "semget") }
2230sub pp_semctl { listop(@_, "semctl") }
2231sub pp_semop { listop(@_, "semop") }
2232sub pp_ghbyaddr { listop(@_, "gethostbyaddr") }
2233sub pp_gnbyaddr { listop(@_, "getnetbyaddr") }
2234sub pp_gpbynumber { listop(@_, "getprotobynumber") }
2235sub pp_gsbyname { listop(@_, "getservbyname") }
2236sub pp_gsbyport { listop(@_, "getservbyport") }
2237sub pp_syscall { listop(@_, "syscall") }
2238
2239sub pp_glob {
2240 my $self = shift;
9d2c6865 2241 my($op, $cx) = @_;
6e90668e
SM
2242 my $text = $self->dq($op->first->sibling); # skip pushmark
2243 if ($text =~ /^\$?(\w|::|\`)+$/ # could look like a readline
d989cdac 2244 or $text =~ /[<>]/) {
6e90668e
SM
2245 return 'glob(' . single_delim('qq', '"', $text) . ')';
2246 } else {
2247 return '<' . $text . '>';
2248 }
2249}
2250
f5aa8f4e
SM
2251# Truncate is special because OPf_SPECIAL makes a bareword first arg
2252# be a filehandle. This could probably be better fixed in the core
2253# by moving the GV lookup into ck_truc.
2254
2255sub pp_truncate {
2256 my $self = shift;
2257 my($op, $cx) = @_;
2258 my(@exprs);
2259 my $parens = ($cx >= 5) || $self->{'parens'};
2260 my $kid = $op->first->sibling;
acba1d67 2261 my $fh;
f5aa8f4e
SM
2262 if ($op->flags & OPf_SPECIAL) {
2263 # $kid is an OP_CONST
18228111 2264 $fh = $self->const_sv($kid)->PV;
f5aa8f4e
SM
2265 } else {
2266 $fh = $self->deparse($kid, 6);
2267 $fh = "+$fh" if not $parens and substr($fh, 0, 1) eq "(";
2268 }
2269 my $len = $self->deparse($kid->sibling, 6);
2270 if ($parens) {
2271 return "truncate($fh, $len)";
2272 } else {
2273 return "truncate $fh, $len";
2274 }
f5aa8f4e
SM
2275}
2276
6e90668e
SM
2277sub indirop {
2278 my $self = shift;
9d2c6865 2279 my($op, $cx, $name) = @_;
6e90668e
SM
2280 my($expr, @exprs);
2281 my $kid = $op->first->sibling;
2282 my $indir = "";
2283 if ($op->flags & OPf_STACKED) {
2284 $indir = $kid;
2285 $indir = $indir->first; # skip rv2gv
2286 if (is_scope($indir)) {
9d2c6865 2287 $indir = "{" . $self->deparse($indir, 0) . "}";
d989cdac 2288 $indir = "{;}" if $indir eq "{}";
c73811ab
RH
2289 } elsif ($indir->name eq "const" && $indir->private & OPpCONST_BARE) {
2290 $indir = $self->const_sv($indir)->PV;
6e90668e 2291 } else {
9d2c6865 2292 $indir = $self->deparse($indir, 24);
6e90668e
SM
2293 }
2294 $indir = $indir . " ";
2295 $kid = $kid->sibling;
2296 }
7e80da18
RH
2297 if ($name eq "sort" && $op->private & (OPpSORT_NUMERIC | OPpSORT_INTEGER)) {
2298 $indir = ($op->private & OPpSORT_REVERSE) ? '{$b <=> $a} '
2299 : '{$a <=> $b} ';
2300 }
2301 elsif ($name eq "sort" && $op->private & OPpSORT_REVERSE) {
2302 $indir = '{$b cmp $a} ';
2303 }
6e90668e 2304 for (; !null($kid); $kid = $kid->sibling) {
9d2c6865 2305 $expr = $self->deparse($kid, 6);
6e90668e
SM
2306 push @exprs, $expr;
2307 }
d989cdac
SM
2308 my $args = $indir . join(", ", @exprs);
2309 if ($indir ne "" and $name eq "sort") {
2310 # We don't want to say "sort(f 1, 2, 3)", since perl -w will
2311 # give bareword warnings in that case. Therefore if context
2312 # requires, we'll put parens around the outside "(sort f 1, 2,
2313 # 3)". Unfortunately, we'll currently think the parens are
2314 # neccessary more often that they really are, because we don't
2315 # distinguish which side of an assignment we're on.
2316 if ($cx >= 5) {
2317 return "($name $args)";
2318 } else {
2319 return "$name $args";
2320 }
2321 } else {
2322 return $self->maybe_parens_func($name, $args, $cx, 5);
2323 }
2324
6e90668e
SM
2325}
2326
2327sub pp_prtf { indirop(@_, "printf") }
2328sub pp_print { indirop(@_, "print") }
2329sub pp_sort { indirop(@_, "sort") }
2330
2331sub mapop {
2332 my $self = shift;
9d2c6865 2333 my($op, $cx, $name) = @_;
6e90668e
SM
2334 my($expr, @exprs);
2335 my $kid = $op->first; # this is the (map|grep)start
2336 $kid = $kid->first->sibling; # skip a pushmark
2337 my $code = $kid->first; # skip a null
2338 if (is_scope $code) {
f4a44678 2339 $code = "{" . $self->deparse($code, 0) . "} ";
6e90668e 2340 } else {
9d2c6865 2341 $code = $self->deparse($code, 24) . ", ";
6e90668e
SM
2342 }
2343 $kid = $kid->sibling;
2344 for (; !null($kid); $kid = $kid->sibling) {
9d2c6865 2345 $expr = $self->deparse($kid, 6);
9a58b761 2346 push @exprs, $expr if defined $expr;
6e90668e 2347 }
9d2c6865 2348 return $self->maybe_parens_func($name, $code . join(", ", @exprs), $cx, 5);
6e90668e
SM
2349}
2350
d989cdac
SM
2351sub pp_mapwhile { mapop(@_, "map") }
2352sub pp_grepwhile { mapop(@_, "grep") }
6e90668e
SM
2353
2354sub pp_list {
2355 my $self = shift;
9d2c6865 2356 my($op, $cx) = @_;
6e90668e
SM
2357 my($expr, @exprs);
2358 my $kid = $op->first->sibling; # skip pushmark
2359 my $lop;
ce4e655d 2360 my $local = "either"; # could be local(...), my(...) or our(...)
6e90668e
SM
2361 for ($lop = $kid; !null($lop); $lop = $lop->sibling) {
2362 # This assumes that no other private flags equal 128, and that
2363 # OPs that store things other than flags in their op_private,
2364 # like OP_AELEMFAST, won't be immediate children of a list.
b8e103fc
RH
2365 #
2366 # OP_ENTERSUB can break this logic, so check for it.
2367 # I suspect that open and exit can too.
2368
2369 if (!($lop->private & (OPpLVAL_INTRO|OPpOUR_INTRO)
ce4e655d 2370 or $lop->name eq "undef")
b8e103fc
RH
2371 or $lop->name eq "entersub"
2372 or $lop->name eq "exit"
2373 or $lop->name eq "open")
6e90668e
SM
2374 {
2375 $local = ""; # or not
2376 last;
2377 }
3f872cb9 2378 if ($lop->name =~ /^pad[ash]v$/) { # my()
ce4e655d 2379 ($local = "", last) if $local eq "local" || $local eq "our";
6e90668e 2380 $local = "my";
b8e103fc
RH
2381 } elsif ($lop->name =~ /^(gv|rv2)[ash]v$/
2382 && $lop->private & OPpOUR_INTRO
2383 or $lop->name eq "null" && $lop->first->name eq "gvsv"
2384 && $lop->first->private & OPpOUR_INTRO) { # our()
ce4e655d
RH
2385 ($local = "", last) if $local eq "my" || $local eq "local";
2386 $local = "our";
3f872cb9 2387 } elsif ($lop->name ne "undef") { # local()
ce4e655d 2388 ($local = "", last) if $local eq "my" || $local eq "our";
6e90668e
SM
2389 $local = "local";
2390 }
2391 }
2392 $local = "" if $local eq "either"; # no point if it's all undefs
f5aa8f4e 2393 return $self->deparse($kid, $cx) if null $kid->sibling and not $local;
6e90668e
SM
2394 for (; !null($kid); $kid = $kid->sibling) {
2395 if ($local) {
3f872cb9 2396 if (class($kid) eq "UNOP" and $kid->first->name eq "gvsv") {
6e90668e
SM
2397 $lop = $kid->first;
2398 } else {
2399 $lop = $kid;
2400 }
2401 $self->{'avoid_local'}{$$lop}++;
9d2c6865 2402 $expr = $self->deparse($kid, 6);
6e90668e
SM
2403 delete $self->{'avoid_local'}{$$lop};
2404 } else {
9d2c6865 2405 $expr = $self->deparse($kid, 6);
6e90668e
SM
2406 }
2407 push @exprs, $expr;
2408 }
9d2c6865
SM
2409 if ($local) {
2410 return "$local(" . join(", ", @exprs) . ")";
2411 } else {
2412 return $self->maybe_parens( join(", ", @exprs), $cx, 6);
2413 }
6e90668e
SM
2414}
2415
6f611a1a
GS
2416sub is_ifelse_cont {
2417 my $op = shift;
2418 return ($op->name eq "null" and class($op) eq "UNOP"
2419 and $op->first->name =~ /^(and|cond_expr)$/
2420 and is_scope($op->first->first->sibling));
2421}
2422
6e90668e
SM
2423sub pp_cond_expr {
2424 my $self = shift;
9d2c6865 2425 my($op, $cx) = @_;
6e90668e
SM
2426 my $cond = $op->first;
2427 my $true = $cond->sibling;
2428 my $false = $true->sibling;
9d2c6865 2429 my $cuddle = $self->{'cuddle'};
d989cdac 2430 unless ($cx < 1 and (is_scope($true) and $true->name ne "null") and
58cccf98
SM
2431 (is_scope($false) || is_ifelse_cont($false))
2432 and $self->{'expand'} < 7) {
f5aa8f4e 2433 $cond = $self->deparse($cond, 8);
9d2c6865
SM
2434 $true = $self->deparse($true, 8);
2435 $false = $self->deparse($false, 8);
2436 return $self->maybe_parens("$cond ? $true : $false", $cx, 8);
6f611a1a
GS
2437 }
2438
f5aa8f4e 2439 $cond = $self->deparse($cond, 1);
d989cdac 2440 $true = $self->deparse($true, 0);
6f611a1a
GS
2441 my $head = "if ($cond) {\n\t$true\n\b}";
2442 my @elsifs;
2443 while (!null($false) and is_ifelse_cont($false)) {
2444 my $newop = $false->first;
2445 my $newcond = $newop->first;
2446 my $newtrue = $newcond->sibling;
2447 $false = $newtrue->sibling; # last in chain is OP_AND => no else
2448 $newcond = $self->deparse($newcond, 1);
2449 $newtrue = $self->deparse($newtrue, 0);
2450 push @elsifs, "elsif ($newcond) {\n\t$newtrue\n\b}";
2451 }
d989cdac 2452 if (!null($false)) {
6f611a1a
GS
2453 $false = $cuddle . "else {\n\t" .
2454 $self->deparse($false, 0) . "\n\b}\cK";
2455 } else {
2456 $false = "\cK";
6e90668e 2457 }
d989cdac 2458 return $head . join($cuddle, "", @elsifs) . $false;
6e90668e
SM
2459}
2460
58cccf98 2461sub loop_common {
6e90668e 2462 my $self = shift;
58cccf98 2463 my($op, $cx, $init) = @_;
6e90668e
SM
2464 my $enter = $op->first;
2465 my $kid = $enter->sibling;
a0405c92
RH
2466 local(@$self{qw'curstash warnings hints'})
2467 = @$self{qw'curstash warnings hints'};
6e90668e 2468 my $head = "";
9d2c6865 2469 my $bare = 0;
58cccf98
SM
2470 my $body;
2471 my $cond = undef;
d989cdac 2472 if ($kid->name eq "lineseq") { # bare or infinite loop
241416b8 2473 if ($kid->last->name eq "unstack") { # infinite
e99ebc55 2474 $head = "while (1) "; # Can't use for(;;) if there's a continue
58cccf98 2475 $cond = "";
9d2c6865
SM
2476 } else {
2477 $bare = 1;
6e90668e 2478 }
58cccf98 2479 $body = $kid;
3f872cb9 2480 } elsif ($enter->name eq "enteriter") { # foreach
6e90668e
SM
2481 my $ary = $enter->first->sibling; # first was pushmark
2482 my $var = $ary->sibling;
f5aa8f4e
SM
2483 if ($enter->flags & OPf_STACKED
2484 and not null $ary->first->sibling->sibling)
2485 {
d7f5b6da
SM
2486 $ary = $self->deparse($ary->first->sibling, 9) . " .. " .
2487 $self->deparse($ary->first->sibling->sibling, 9);
d8d95777
GA
2488 } else {
2489 $ary = $self->deparse($ary, 1);
2490 }
6e90668e 2491 if (null $var) {
f6f9bdb7 2492 if ($enter->flags & OPf_SPECIAL) { # thread special var
9d2c6865 2493 $var = $self->pp_threadsv($enter, 1);
f6f9bdb7 2494 } else { # regular my() variable
9d2c6865 2495 $var = $self->pp_padsv($enter, 1);
6e90668e 2496 }
3f872cb9 2497 } elsif ($var->name eq "rv2gv") {
9d2c6865 2498 $var = $self->pp_rv2sv($var, 1);
241416b8
DM
2499 if ($enter->private & OPpOUR_INTRO) {
2500 # our declarations don't have package names
2501 $var =~ s/^(.).*::/$1/;
2502 $var = "our $var";
2503 }
3f872cb9 2504 } elsif ($var->name eq "gv") {
9d2c6865 2505 $var = "\$" . $self->deparse($var, 1);
6e90668e 2506 }
9d2c6865 2507 $head = "foreach $var ($ary) ";
58cccf98 2508 $body = $kid->first->first->sibling; # skip OP_AND and OP_ITER
3f872cb9 2509 } elsif ($kid->name eq "null") { # while/until
6e90668e 2510 $kid = $kid->first;
58cccf98
SM
2511 my $name = {"and" => "while", "or" => "until"}->{$kid->name};
2512 $cond = $self->deparse($kid->first, 1);
2513 $head = "$name ($cond) ";
2514 $body = $kid->first->sibling;
3f872cb9 2515 } elsif ($kid->name eq "stub") { # bare and empty
9d2c6865 2516 return "{;}"; # {} could be a hashref
6e90668e 2517 }
58cccf98 2518 # If there isn't a continue block, then the next pointer for the loop
241416b8 2519 # will point to the unstack, which is kid's last child, except
58cccf98 2520 # in a bare loop, when it will point to the leaveloop. When neither of
241416b8 2521 # these conditions hold, then the second-to-last child is the continue
58cccf98
SM
2522 # block (or the last in a bare loop).
2523 my $cont_start = $enter->nextop;
2524 my $cont;
241416b8 2525 if ($$cont_start != $$op && ${$cont_start} != ${$body->last}) {
58cccf98
SM
2526 if ($bare) {
2527 $cont = $body->last;
2528 } else {
2529 $cont = $body->first;
241416b8 2530 while (!null($cont->sibling->sibling)) {
58cccf98
SM
2531 $cont = $cont->sibling;
2532 }
2533 }
2534 my $state = $body->first;
2535 my $cuddle = $self->{'cuddle'};
2536 my @states;
2537 for (; $$state != $$cont; $state = $state->sibling) {
2538 push @states, $state;
2539 }
ce4e655d 2540 $body = $self->lineseq(undef, @states);
58cccf98
SM
2541 if (defined $cond and not is_scope $cont and $self->{'expand'} < 3) {
2542 $head = "for ($init; $cond; " . $self->deparse($cont, 1) .") ";
2543 $cont = "\cK";
2544 } else {
2545 $cont = $cuddle . "continue {\n\t" .
2546 $self->deparse($cont, 0) . "\n\b}\cK";
6e90668e 2547 }
6e90668e 2548 } else {
7a9b44b9 2549 return "" if !defined $body;
c73811ab
RH
2550 if (length $init) {
2551 $head = "for ($init; $cond;) ";
2552 }
9d2c6865 2553 $cont = "\cK";
58cccf98 2554 $body = $self->deparse($body, 0);
6e90668e 2555 }
ce4e655d 2556 $body =~ s/;?$/;\n/;
34a48b4b
RH
2557
2558 return $head . "{\n\t" . $body . "\b}" . $cont;
58cccf98
SM
2559}
2560
2561sub pp_leaveloop { loop_common(@_, "") }
2562
2563sub for_loop {
2564 my $self = shift;
2565 my($op, $cx) = @_;
2566 my $init = $self->deparse($op, 1);
c73811ab 2567 return $self->loop_common($op->sibling->first->sibling, $cx, $init);
6e90668e
SM
2568}
2569
2570sub pp_leavetry {
2571 my $self = shift;
9d2c6865 2572 return "eval {\n\t" . $self->pp_leave(@_) . "\n\b}";
bd0865ec 2573}
6e90668e 2574
bd0865ec
GS
2575BEGIN { eval "sub OP_CONST () {" . opnumber("const") . "}" }
2576BEGIN { eval "sub OP_STRINGIFY () {" . opnumber("stringify") . "}" }
a9760014 2577BEGIN { eval "sub OP_RV2SV () {" . opnumber("rv2sv") . "}" }
90c0eb26 2578BEGIN { eval "sub OP_LIST () {" . opnumber("list") . "}" }
f5aa8f4e 2579
a798dbf2 2580sub pp_null {
6e90668e 2581 my $self = shift;
d989cdac 2582 my($op, $cx) = @_;
6e90668e 2583 if (class($op) eq "OP") {
f4a44678
SM
2584 # old value is lost
2585 return $self->{'ex_const'} if $op->targ == OP_CONST;
3f872cb9 2586 } elsif ($op->first->name eq "pushmark") {
9d2c6865 2587 return $self->pp_list($op, $cx);
3f872cb9 2588 } elsif ($op->first->name eq "enter") {
9d2c6865 2589 return $self->pp_leave($op, $cx);
bd0865ec 2590 } elsif ($op->targ == OP_STRINGIFY) {
6f611a1a 2591 return $self->dquote($op, $cx);
6e90668e 2592 } elsif (!null($op->first->sibling) and
3f872cb9 2593 $op->first->sibling->name eq "readline" and
6e90668e 2594 $op->first->sibling->flags & OPf_STACKED) {
9d2c6865
SM
2595 return $self->maybe_parens($self->deparse($op->first, 7) . " = "
2596 . $self->deparse($op->first->sibling, 7),
2597 $cx, 7);
6e90668e 2598 } elsif (!null($op->first->sibling) and
3f872cb9 2599 $op->first->sibling->name eq "trans" and
6e90668e 2600 $op->first->sibling->flags & OPf_STACKED) {
9d2c6865
SM
2601 return $self->maybe_parens($self->deparse($op->first, 20) . " =~ "
2602 . $self->deparse($op->first->sibling, 20),
2603 $cx, 20);
d989cdac
SM
2604 } elsif ($op->flags & OPf_SPECIAL && $cx < 1 && !$op->targ) {
2605 return "do {\n\t". $self->deparse($op->first, $cx) ."\n\b};";
ad8caead
RGS
2606 } elsif (!null($op->first->sibling) and
2607 $op->first->sibling->name eq "null" and
2608 class($op->first->sibling) eq "UNOP" and
2609 $op->first->sibling->first->flags & OPf_STACKED and
2610 $op->first->sibling->first->name eq "rcatline") {
2611 return $self->maybe_parens($self->deparse($op->first, 18) . " .= "
2612 . $self->deparse($op->first->sibling, 18),
2613 $cx, 18);
6e90668e 2614 } else {
9d2c6865 2615 return $self->deparse($op->first, $cx);
6e90668e 2616 }
a798dbf2
MB
2617}
2618
6e90668e
SM
2619sub padname {
2620 my $self = shift;
2621 my $targ = shift;
68223ea3 2622 return $self->padname_sv($targ)->PVX;
6e90668e
SM
2623}
2624
2625sub padany {
2626 my $self = shift;
2627 my $op = shift;
2628 return substr($self->padname($op->targ), 1); # skip $/@/%
2629}
2630
2631sub pp_padsv {
2632 my $self = shift;
9d2c6865
SM
2633 my($op, $cx) = @_;
2634 return $self->maybe_my($op, $cx, $self->padname($op->targ));
6e90668e
SM
2635}
2636
2637sub pp_padav { pp_padsv(@_) }
2638sub pp_padhv { pp_padsv(@_) }
2639
9d2c6865
SM
2640my @threadsv_names;
2641
2642BEGIN {
2643 @threadsv_names = ("_", "1", "2", "3", "4", "5", "6", "7", "8", "9",
2644 "&", "`", "'", "+", "/", ".", ",", "\\", '"', ";",
2645 "^", "-", "%", "=", "|", "~", ":", "^A", "^E",
2646 "!", "@");
2647}
f6f9bdb7
SM
2648
2649sub pp_threadsv {
2650 my $self = shift;
9d2c6865
SM
2651 my($op, $cx) = @_;
2652 return $self->maybe_local($op, $cx, "\$" . $threadsv_names[$op->targ]);
d989cdac 2653}
f6f9bdb7 2654
6f611a1a 2655sub gv_or_padgv {
18228111
GS
2656 my $self = shift;
2657 my $op = shift;
6f611a1a
GS
2658 if (class($op) eq "PADOP") {
2659 return $self->padval($op->padix);
2660 } else { # class($op) eq "SVOP"
2661 return $op->gv;
18228111 2662 }
18228111
GS
2663}
2664
6e90668e
SM
2665sub pp_gvsv {
2666 my $self = shift;
9d2c6865 2667 my($op, $cx) = @_;
6f611a1a 2668 my $gv = $self->gv_or_padgv($op);
8510e997
RH
2669 return $self->maybe_local($op, $cx, $self->stash_variable("\$",
2670 $self->gv_name($gv)));
6e90668e
SM
2671}
2672
2673sub pp_gv {
2674 my $self = shift;
9d2c6865 2675 my($op, $cx) = @_;
6f611a1a 2676 my $gv = $self->gv_or_padgv($op);
18228111 2677 return $self->gv_name($gv);
6e90668e
SM
2678}
2679
2680sub pp_aelemfast {
2681 my $self = shift;
9d2c6865 2682 my($op, $cx) = @_;
6f611a1a 2683 my $gv = $self->gv_or_padgv($op);
ce4e655d
RH
2684 my $name = $self->gv_name($gv);
2685 $name = $self->{'curstash'}."::$name"
2686 if $name !~ /::/ && $self->lex_in_scope('@'.$name);
2687
2688 return "\$" . $name . "[" .
7a9b44b9 2689 ($op->private + $self->{'arybase'}) . "]";
6e90668e
SM
2690}
2691
2692sub rv2x {
2693 my $self = shift;
9d2c6865 2694 my($op, $cx, $type) = @_;
90c0eb26
RH
2695
2696 if (class($op) eq 'NULL' || !$op->can("first")) {
ff97752d 2697 carp("Unexpected op in pp_rv2x");
90c0eb26
RH
2698 return 'XXX';
2699 }
6e90668e 2700 my $kid = $op->first;
d989cdac
SM
2701 if ($kid->name eq "gv") {
2702 return $self->stash_variable($type, $self->deparse($kid, 0));
2703 } elsif (is_scalar $kid) {
2704 my $str = $self->deparse($kid, 0);
2705 if ($str =~ /^\$([^\w\d])\z/) {
2706 # "$$+" isn't a legal way to write the scalar dereference
2707 # of $+, since the lexer can't tell you aren't trying to
2708 # do something like "$$ + 1" to get one more than your
2709 # PID. Either "${$+}" or "$${+}" are workable
2710 # disambiguations, but if the programmer did the former,
2711 # they'd be in the "else" clause below rather than here.
2712 # It's not clear if this should somehow be unified with
2713 # the code in dq and re_dq that also adds lexer
2714 # disambiguation braces.
2715 $str = '$' . "{$1}"; #'
2716 }
2717 return $type . $str;
2718 } else {
2719 return $type . "{" . $self->deparse($kid, 0) . "}";
2720 }
6e90668e
SM
2721}
2722
2723sub pp_rv2sv { maybe_local(@_, rv2x(@_, "\$")) }
2724sub pp_rv2hv { maybe_local(@_, rv2x(@_, "%")) }
2725sub pp_rv2gv { maybe_local(@_, rv2x(@_, "*")) }
2726
2727# skip rv2av
2728sub pp_av2arylen {
2729 my $self = shift;
9d2c6865 2730 my($op, $cx) = @_;
3f872cb9 2731 if ($op->first->name eq "padav") {
9d2c6865 2732 return $self->maybe_local($op, $cx, '$#' . $self->padany($op->first));
6e90668e 2733 } else {
f5aa8f4e
SM
2734 return $self->maybe_local($op, $cx,
2735 $self->rv2x($op->first, $cx, '$#'));
6e90668e
SM
2736 }
2737}
2738
2739# skip down to the old, ex-rv2cv
90c0eb26
RH
2740sub pp_rv2cv {
2741 my ($self, $op, $cx) = @_;
2742 if (!null($op->first) && $op->first->name eq 'null' &&
2743 $op->first->targ eq OP_LIST)
2744 {
2745 return $self->rv2x($op->first->first->sibling, $cx, "&")
2746 }
2747 else {
2748 return $self->rv2x($op, $cx, "")
2749 }
2750}
6e90668e 2751
d989cdac
SM
2752sub list_const {
2753 my $self = shift;
2754 my($cx, @list) = @_;
2755 my @a = map $self->const($_, 6), @list;
2756 if (@a == 0) {
2757 return "()";
2758 } elsif (@a == 1) {
2759 return $a[0];
2760 } elsif ( @a > 2 and !grep(!/^-?\d+$/, @a)) {
2761 # collapse (-1,0,1,2) into (-1..2)
2762 my ($s, $e) = @a[0,-1];
2763 my $i = $s;
2764 return $self->maybe_parens("$s..$e", $cx, 9)
2765 unless grep $i++ != $_, @a;
2766 }
2767 return $self->maybe_parens(join(", ", @a), $cx, 6);
2768}
2769
6e90668e
SM
2770sub pp_rv2av {
2771 my $self = shift;
9d2c6865 2772 my($op, $cx) = @_;
6e90668e 2773 my $kid = $op->first;
3f872cb9 2774 if ($kid->name eq "const") { # constant list
18228111 2775 my $av = $self->const_sv($kid);
d989cdac 2776 return $self->list_const($cx, $av->ARRAY);
6e90668e 2777 } else {
9d2c6865 2778 return $self->maybe_local($op, $cx, $self->rv2x($op, $cx, "\@"));
6e90668e
SM
2779 }
2780 }
2781
3ed82cfc
GS
2782sub is_subscriptable {
2783 my $op = shift;
2784 if ($op->name =~ /^[ahg]elem/) {
2785 return 1;
2786 } elsif ($op->name eq "entersub") {
2787 my $kid = $op->first;
2788 return 0 unless null $kid->sibling;
2789 $kid = $kid->first;
2790 $kid = $kid->sibling until null $kid->sibling;
2791 return 0 if is_scope($kid);
2792 $kid = $kid->first;
2793 return 0 if $kid->name eq "gv";
2794 return 0 if is_scalar($kid);
2795 return is_subscriptable($kid);
2796 } else {
2797 return 0;
2798 }
2799}
6e90668e
SM
2800
2801sub elem {
2802 my $self = shift;
9d2c6865 2803 my ($op, $cx, $left, $right, $padname) = @_;
6e90668e 2804 my($array, $idx) = ($op->first, $op->first->sibling);
3f872cb9 2805 unless ($array->name eq $padname) { # Maybe this has been fixed
6e90668e
SM
2806 $array = $array->first; # skip rv2av (or ex-rv2av in _53+)
2807 }
3f872cb9 2808 if ($array->name eq $padname) {
6e90668e
SM
2809 $array = $self->padany($array);
2810 } elsif (is_scope($array)) { # ${expr}[0]
9d2c6865 2811 $array = "{" . $self->deparse($array, 0) . "}";
ce4e655d
RH
2812 } elsif ($array->name eq "gv") {
2813 $array = $self->gv_name($self->gv_or_padgv($array));
2814 if ($array !~ /::/) {
2815 my $prefix = ($left eq '[' ? '@' : '%');
2816 $array = $self->{curstash}.'::'.$array
2817 if $self->lex_in_scope($prefix . $array);
2818 }
6e90668e 2819 } elsif (is_scalar $array) { # $x[0], $$x[0], ...
9d2c6865 2820 $array = $self->deparse($array, 24);
6e90668e
SM
2821 } else {
2822 # $x[20][3]{hi} or expr->[20]
3ed82cfc 2823 my $arrow = is_subscriptable($array) ? "" : "->";
9d2c6865
SM
2824 return $self->deparse($array, 24) . $arrow .
2825 $left . $self->deparse($idx, 1) . $right;
6e90668e 2826 }
9d2c6865 2827 $idx = $self->deparse($idx, 1);
7a9b44b9
RH
2828
2829 # Outer parens in an array index will confuse perl
2830 # if we're interpolating in a regular expression, i.e.
2831 # /$x$foo[(-1)]/ is *not* the same as /$x$foo[-1]/
2832 #
2833 # If $self->{parens}, then an initial '(' will
2834 # definitely be paired with a final ')'. If
2835 # !$self->{parens}, the misleading parens won't
2836 # have been added in the first place.
2837 #
2838 # [You might think that we could get "(...)...(...)"
2839 # where the initial and final parens do not match
2840 # each other. But we can't, because the above would
2841 # only happen if there's an infix binop between the
2842 # two pairs of parens, and *that* means that the whole
2843 # expression would be parenthesized as well.]
2844 #
2845 $idx =~ s/^\((.*)\)$/$1/ if $self->{'parens'};
2846
098251bc
RH
2847 # Hash-element braces will autoquote a bareword inside themselves.
2848 # We need to make sure that C<$hash{warn()}> doesn't come out as
2849 # C<$hash{warn}>, which has a quite different meaning. Currently
2850 # B::Deparse will always quote strings, even if the string was a
2851 # bareword in the original (i.e. the OPpCONST_BARE flag is ignored
2852 # for constant strings.) So we can cheat slightly here - if we see
2853 # a bareword, we know that it is supposed to be a function call.
2854 #
2855 $idx =~ s/^([A-Za-z_]\w*)$/$1()/;
2856
6e90668e
SM
2857 return "\$" . $array . $left . $idx . $right;
2858}
2859
3f872cb9
GS
2860sub pp_aelem { maybe_local(@_, elem(@_, "[", "]", "padav")) }
2861sub pp_helem { maybe_local(@_, elem(@_, "{", "}", "padhv")) }
6e90668e
SM
2862
2863sub pp_gelem {
2864 my $self = shift;
9d2c6865 2865 my($op, $cx) = @_;
6e90668e
SM
2866 my($glob, $part) = ($op->first, $op->last);
2867 $glob = $glob->first; # skip rv2gv
3f872cb9 2868 $glob = $glob->first if $glob->name eq "rv2gv"; # this one's a bug
9d2c6865
SM
2869 my $scope = is_scope($glob);
2870 $glob = $self->deparse($glob, 0);
2871 $part = $self->deparse($part, 1);
6e90668e
SM
2872 return "*" . ($scope ? "{$glob}" : $glob) . "{$part}";
2873}
2874
2875sub slice {
2876 my $self = shift;
9d2c6865 2877 my ($op, $cx, $left, $right, $regname, $padname) = @_;
6e90668e
SM
2878 my $last;
2879 my(@elems, $kid, $array, $list);
2880 if (class($op) eq "LISTOP") {
2881 $last = $op->last;
2882 } else { # ex-hslice inside delete()
2883 for ($kid = $op->first; !null $kid->sibling; $kid = $kid->sibling) {}
2884 $last = $kid;
2885 }
2886 $array = $last;
2887 $array = $array->first
3f872cb9 2888 if $array->name eq $regname or $array->name eq "null";
6e90668e 2889 if (is_scope($array)) {
9d2c6865 2890 $array = "{" . $self->deparse($array, 0) . "}";
3f872cb9 2891 } elsif ($array->name eq $padname) {
6e90668e
SM
2892 $array = $self->padany($array);
2893 } else {
9d2c6865 2894 $array = $self->deparse($array, 24);
6e90668e
SM
2895 }
2896 $kid = $op->first->sibling; # skip pushmark
3f872cb9 2897 if ($kid->name eq "list") {
6e90668e
SM
2898 $kid = $kid->first->sibling; # skip list, pushmark
2899 for (; !null $kid; $kid = $kid->sibling) {
9d2c6865 2900 push @elems, $self->deparse($kid, 6);
6e90668e
SM
2901 }
2902 $list = join(", ", @elems);
2903 } else {
9d2c6865 2904 $list = $self->deparse($kid, 1);
6e90668e
SM
2905 }
2906 return "\@" . $array . $left . $list . $right;
2907}
2908
3ed82cfc
GS
2909sub pp_aslice { maybe_local(@_, slice(@_, "[", "]", "rv2av", "padav")) }
2910sub pp_hslice { maybe_local(@_, slice(@_, "{", "}", "rv2hv", "padhv")) }
6e90668e
SM
2911
2912sub pp_lslice {
2913 my $self = shift;
9d2c6865 2914 my($op, $cx) = @_;
6e90668e
SM
2915 my $idx = $op->first;
2916 my $list = $op->last;
2917 my(@elems, $kid);
9d2c6865
SM
2918 $list = $self->deparse($list, 1);
2919 $idx = $self->deparse($idx, 1);
2920 return "($list)" . "[$idx]";
6e90668e
SM
2921}
2922
6e90668e
SM
2923sub want_scalar {
2924 my $op = shift;
2925 return ($op->flags & OPf_WANT) == OPf_WANT_SCALAR;
2926}
2927
bd0865ec
GS
2928sub want_list {
2929 my $op = shift;
2930 return ($op->flags & OPf_WANT) == OPf_WANT_LIST;
2931}
2932
2933sub method {
6e90668e 2934 my $self = shift;
9d2c6865 2935 my($op, $cx) = @_;
bd0865ec
GS
2936 my $kid = $op->first->sibling; # skip pushmark
2937 my($meth, $obj, @exprs);
3f872cb9 2938 if ($kid->name eq "list" and want_list $kid) {
bd0865ec
GS
2939 # When an indirect object isn't a bareword but the args are in
2940 # parens, the parens aren't part of the method syntax (the LLAFR
2941 # doesn't apply), but they make a list with OPf_PARENS set that
2942 # doesn't get flattened by the append_elem that adds the method,
2943 # making a (object, arg1, arg2, ...) list where the object
d989cdac 2944 # usually is. This can be distinguished from
bd0865ec
GS
2945 # `($obj, $arg1, $arg2)->meth()' (which is legal if $arg2 is an
2946 # object) because in the later the list is in scalar context
2947 # as the left side of -> always is, while in the former
2948 # the list is in list context as method arguments always are.
2949 # (Good thing there aren't method prototypes!)
3ed82cfc 2950 $meth = $kid->sibling;
bd0865ec
GS
2951 $kid = $kid->first->sibling; # skip pushmark
2952 $obj = $kid;
6e90668e 2953 $kid = $kid->sibling;
bd0865ec 2954 for (; not null $kid; $kid = $kid->sibling) {
9d2c6865 2955 push @exprs, $self->deparse($kid, 6);
6e90668e 2956 }
bd0865ec
GS
2957 } else {
2958 $obj = $kid;
2959 $kid = $kid->sibling;
90c0eb26
RH
2960 for (; !null ($kid->sibling) && $kid->name ne "method_named";
2961 $kid = $kid->sibling) {
bd0865ec 2962 push @exprs, $self->deparse($kid, 6);
6e90668e 2963 }
3ed82cfc 2964 $meth = $kid;
bd0865ec
GS
2965 }
2966 $obj = $self->deparse($obj, 24);
3ed82cfc 2967 if ($meth->name eq "method_named") {
18228111 2968 $meth = $self->const_sv($meth)->PV;
bd0865ec 2969 } else {
3ed82cfc
GS
2970 $meth = $meth->first;
2971 if ($meth->name eq "const") {
2972 # As of 5.005_58, this case is probably obsoleted by the
2973 # method_named case above
18228111 2974 $meth = $self->const_sv($meth)->PV; # needs to be bare
3ed82cfc
GS
2975 } else {
2976 $meth = $self->deparse($meth, 1);
2977 }
bd0865ec
GS
2978 }
2979 my $args = join(", ", @exprs);
2980 $kid = $obj . "->" . $meth;
145eb477 2981 if (length $args) {
bd0865ec
GS
2982 return $kid . "(" . $args . ")"; # parens mandatory
2983 } else {
2984 return $kid;
2985 }
2986}
2987
2988# returns "&" if the prototype doesn't match the args,
2989# or ("", $args_after_prototype_demunging) if it does.
2990sub check_proto {
2991 my $self = shift;
acaaef34 2992 return "&" if $self->{'noproto'};
bd0865ec
GS
2993 my($proto, @args) = @_;
2994 my($arg, $real);
2995 my $doneok = 0;
2996 my @reals;
2997 # An unbackslashed @ or % gobbles up the rest of the args
2ae48fff 2998 1 while $proto =~ s/(?<!\\)([@%])[^\]]+$/$1/;
bd0865ec 2999 while ($proto) {
2ae48fff 3000 $proto =~ s/^(\\?[\$\@&%*]|\\\[[\$\@&%*]+\]|;)//;
bd0865ec
GS
3001 my $chr = $1;
3002 if ($chr eq "") {
3003 return "&" if @args;
3004 } elsif ($chr eq ";") {
3005 $doneok = 1;
3006 } elsif ($chr eq "@" or $chr eq "%") {
3007 push @reals, map($self->deparse($_, 6), @args);
3008 @args = ();
6e90668e 3009 } else {
bd0865ec
GS
3010 $arg = shift @args;
3011 last unless $arg;
3012 if ($chr eq "\$") {
3013 if (want_scalar $arg) {
3014 push @reals, $self->deparse($arg, 6);
3015 } else {
3016 return "&";
3017 }
3018 } elsif ($chr eq "&") {
3f872cb9 3019 if ($arg->name =~ /^(s?refgen|undef)$/) {
bd0865ec
GS
3020 push @reals, $self->deparse($arg, 6);
3021 } else {
3022 return "&";
3023 }
3024 } elsif ($chr eq "*") {
3f872cb9
GS
3025 if ($arg->name =~ /^s?refgen$/
3026 and $arg->first->first->name eq "rv2gv")
bd0865ec
GS
3027 {
3028 $real = $arg->first->first; # skip refgen, null
3f872cb9 3029 if ($real->first->name eq "gv") {
bd0865ec
GS
3030 push @reals, $self->deparse($real, 6);
3031 } else {
3032 push @reals, $self->deparse($real->first, 6);
3033 }
3034 } else {
3035 return "&";
3036 }
3037 } elsif (substr($chr, 0, 1) eq "\\") {
2ae48fff 3038 $chr =~ tr/\\[]//d;
3f872cb9 3039 if ($arg->name =~ /^s?refgen$/ and
bd0865ec 3040 !null($real = $arg->first) and
2ae48fff
RGS
3041 ($chr =~ /\$/ && is_scalar($real->first)
3042 or ($chr =~ /@/
3043 && class($real->first->sibling) ne 'NULL'
3f872cb9
GS
3044 && $real->first->sibling->name
3045 =~ /^(rv2|pad)av$/)
2ae48fff
RGS
3046 or ($chr =~ /%/
3047 && class($real->first->sibling) ne 'NULL'
3f872cb9
GS
3048 && $real->first->sibling->name
3049 =~ /^(rv2|pad)hv$/)
2ae48fff 3050 #or ($chr =~ /&/ # This doesn't work
3f872cb9 3051 # && $real->first->name eq "rv2cv")
2ae48fff 3052 or ($chr =~ /\*/
3f872cb9 3053 && $real->first->name eq "rv2gv")))
bd0865ec
GS
3054 {
3055 push @reals, $self->deparse($real, 6);
3056 } else {
3057 return "&";
3058 }
3059 }
3060 }
9d2c6865 3061 }
bd0865ec
GS
3062 return "&" if $proto and !$doneok; # too few args and no `;'
3063 return "&" if @args; # too many args
3064 return ("", join ", ", @reals);
3065}
3066
3067sub pp_entersub {
3068 my $self = shift;
3069 my($op, $cx) = @_;
3070 return $self->method($op, $cx) unless null $op->first->sibling;
3071 my $prefix = "";
3072 my $amper = "";
3073 my($kid, @exprs);
90c0eb26 3074 if ($op->flags & OPf_SPECIAL && !($op->flags & OPf_MOD)) {
9d2c6865
SM
3075 $prefix = "do ";
3076 } elsif ($op->private & OPpENTERSUB_AMPER) {
3077 $amper = "&";
3078 }
3079 $kid = $op->first;
3080 $kid = $kid->first->sibling; # skip ex-list, pushmark
3081 for (; not null $kid->sibling; $kid = $kid->sibling) {
3082 push @exprs, $kid;
3083 }
bd0865ec
GS
3084 my $simple = 0;
3085 my $proto = undef;
9d2c6865
SM
3086 if (is_scope($kid)) {
3087 $amper = "&";
3088 $kid = "{" . $self->deparse($kid, 0) . "}";
3f872cb9 3089 } elsif ($kid->first->name eq "gv") {
6f611a1a 3090 my $gv = $self->gv_or_padgv($kid->first);
9d2c6865
SM
3091 if (class($gv->CV) ne "SPECIAL") {
3092 $proto = $gv->CV->PV if $gv->CV->FLAGS & SVf_POK;
3093 }
bd0865ec 3094 $simple = 1; # only calls of named functions can be prototyped
9d2c6865 3095 $kid = $self->deparse($kid, 24);
90c0eb26 3096 } elsif (is_scalar ($kid->first) && $kid->first->name ne 'rv2cv') {
9d2c6865
SM
3097 $amper = "&";
3098 $kid = $self->deparse($kid, 24);
3099 } else {
3100 $prefix = "";
3ed82cfc
GS
3101 my $arrow = is_subscriptable($kid->first) ? "" : "->";
3102 $kid = $self->deparse($kid, 24) . $arrow;
9d2c6865 3103 }
0ca62a8e
RH
3104
3105 # Doesn't matter how many prototypes there are, if
3106 # they haven't happened yet!
1d38190f
RGS
3107 my $declared;
3108 {
3109 no strict 'refs';
3110 no warnings 'uninitialized';
3111 $declared = exists $self->{'subs_declared'}{$kid}
d989cdac 3112 || (
1d38190f
RGS
3113 defined &{ %{$self->{'curstash'}."::"}->{$kid} }
3114 && !exists
3115 $self->{'subs_deparsed'}{$self->{'curstash'}."::".$kid}
3116 && defined prototype $self->{'curstash'}."::".$kid
3117 );
3118 if (!$declared && defined($proto)) {
3119 # Avoid "too early to check prototype" warning
3120 ($amper, $proto) = ('&');
3121 }
e99ebc55 3122 }
0ca62a8e 3123
bd0865ec 3124 my $args;
0ca62a8e 3125 if ($declared and defined $proto and not $amper) {
bd0865ec
GS
3126 ($amper, $args) = $self->check_proto($proto, @exprs);
3127 if ($amper eq "&") {
9d2c6865
SM
3128 $args = join(", ", map($self->deparse($_, 6), @exprs));
3129 }
3130 } else {
3131 $args = join(", ", map($self->deparse($_, 6), @exprs));
6e90668e 3132 }
9d2c6865
SM
3133 if ($prefix or $amper) {
3134 if ($op->flags & OPf_STACKED) {
3135 return $prefix . $amper . $kid . "(" . $args . ")";
3136 } else {
3137 return $prefix . $amper. $kid;
3138 }
6e90668e 3139 } else {
34a48b4b 3140 # glob() invocations can be translated into calls of
d1be9408 3141 # CORE::GLOBAL::glob with a second parameter, a number.
34a48b4b
RH
3142 # Reverse this.
3143 if ($kid eq "CORE::GLOBAL::glob") {
3144 $kid = "glob";
3145 $args =~ s/\s*,[^,]+$//;
3146 }
3147
3148 # It's a syntax error to call CORE::GLOBAL::foo without a prefix,
3149 # so it must have been translated from a keyword call. Translate
3150 # it back.
3151 $kid =~ s/^CORE::GLOBAL:://;
3152
d989cdac 3153 my $dproto = defined($proto) ? $proto : "undefined";
0ca62a8e
RH
3154 if (!$declared) {
3155 return "$kid(" . $args . ")";
d989cdac 3156 } elsif ($dproto eq "") {
9d2c6865 3157 return $kid;
d989cdac
SM
3158 } elsif ($dproto eq "\$" and is_scalar($exprs[0])) {
3159 # is_scalar is an excessively conservative test here:
3160 # really, we should be comparing to the precedence of the
3161 # top operator of $exprs[0] (ala unop()), but that would
3162 # take some major code restructuring to do right.
9d2c6865 3163 return $self->maybe_parens_func($kid, $args, $cx, 16);
d989cdac 3164 } elsif ($dproto ne '$' and defined($proto) || $simple) { #'
9d2c6865
SM
3165 return $self->maybe_parens_func($kid, $args, $cx, 5);
3166 } else {
3167 return "$kid(" . $args . ")";
3168 }
6e90668e
SM
3169 }
3170}
3171
3172sub pp_enterwrite { unop(@_, "write") }
3173
3174# escape things that cause interpolation in double quotes,
3175# but not character escapes
3176sub uninterp {
3177 my($str) = @_;
3f766ba3 3178 $str =~ s/(^|\G|[^\\])((?:\\\\)*)([\$\@]|\\[uUlLQE])/$1$2\\$3/g;
9d2c6865
SM
3179 return $str;
3180}
3181
b7dad2dc
RH
3182{
3183my $bal;
3184BEGIN {
cdf8218f
RH
3185 use re "eval";
3186 # Matches any string which is balanced with respect to {braces}
b7dad2dc 3187 $bal = qr(
cdf8218f
RH
3188 (?:
3189 [^\\{}]
3190 | \\\\
3191 | \\[{}]
3192 | \{(??{$bal})\}
3193 )*
3194 )x;
b7dad2dc
RH
3195}
3196
3197# the same, but treat $|, $), $( and $ at the end of the string differently
3198sub re_uninterp {
3199 my($str) = @_;
cdf8218f
RH
3200
3201 $str =~ s/
3202 ( ^|\G # $1
3203 | [^\\]
3204 )
3205
3206 ( # $2
3207 (?:\\\\)*
3208 )
3209
3210 ( # $3
3211 (\(\?\??\{$bal\}\)) # $4
3212 | [\$\@]
3213 (?!\||\)|\(|$)
3214 | \\[uUlLQE]
3215 )
3216
2621462b 3217 /defined($4) && length($4) ? "$1$2$4" : "$1$2\\$3"/xeg;
cdf8218f 3218
6e90668e
SM
3219 return $str;
3220}
3221
b7dad2dc
RH
3222# This is for regular expressions with the /x modifier
3223# We have to leave comments unmangled.
a9760014 3224sub re_uninterp_extended {
b7dad2dc
RH
3225 my($str) = @_;
3226
3227 $str =~ s/
3228 ( ^|\G # $1
3229 | [^\\]
3230 )
3231
3232 ( # $2
3233 (?:\\\\)*
3234 )
3235
3236 ( # $3
3237 ( \(\?\??\{$bal\}\) # $4 (skip over (?{}) and (??{}) blocks)
3238 | \#[^\n]* # (skip over comments)
3239 )
3240 | [\$\@]
9a58b761 3241 (?!\||\)|\(|$|\s)
b7dad2dc
RH
3242 | \\[uUlLQE]
3243 )
3244
c7de4c66 3245 /defined($4) && length($4) ? "$1$2$4" : "$1$2\\$3"/xeg;
b7dad2dc 3246
a9760014
RH
3247 return $str;
3248}
b7dad2dc 3249}
a9760014 3250
57aa3c4e
JH
3251my %unctrl = # portable to to EBCDIC
3252 (
3253 "\c@" => '\c@', # unused
3254 "\cA" => '\cA',
3255 "\cB" => '\cB',
3256 "\cC" => '\cC',
3257 "\cD" => '\cD',
3258 "\cE" => '\cE',
3259 "\cF" => '\cF',
3260 "\cG" => '\cG',
3261 "\cH" => '\cH',
3262 "\cI" => '\cI',
3263 "\cJ" => '\cJ',
3264 "\cK" => '\cK',
3265 "\cL" => '\cL',
3266 "\cM" => '\cM',
3267 "\cN" => '\cN',
3268 "\cO" => '\cO',
3269 "\cP" => '\cP',
3270 "\cQ" => '\cQ',
3271 "\cR" => '\cR',
3272 "\cS" => '\cS',
3273 "\cT" => '\cT',
3274 "\cU" => '\cU',
3275 "\cV" => '\cV',
3276 "\cW" => '\cW',
3277 "\cX" => '\cX',
3278 "\cY" => '\cY',
3279 "\cZ" => '\cZ',
3280 "\c[" => '\c[', # unused
3281 "\c\\" => '\c\\', # unused
3282 "\c]" => '\c]', # unused
3283 "\c_" => '\c_', # unused
3284 );
3285
6e90668e 3286# character escapes, but not delimiters that might need to be escaped
746698c5 3287sub escape_str { # ASCII, UTF8
6e90668e 3288 my($str) = @_;
cef22867 3289 $str =~ s/(.)/ord($1) > 255 ? sprintf("\\x{%x}", ord($1)) : $1/eg;
6e90668e 3290 $str =~ s/\a/\\a/g;
d989cdac 3291# $str =~ s/\cH/\\b/g; # \b means something different in a regex
6e90668e
SM
3292 $str =~ s/\t/\\t/g;
3293 $str =~ s/\n/\\n/g;
3294 $str =~ s/\e/\\e/g;
3295 $str =~ s/\f/\\f/g;
3296 $str =~ s/\r/\\r/g;
fc132725 3297 $str =~ s/([\cA-\cZ])/$unctrl{$1}/ge;
cef22867 3298 $str =~ s/([[:^print:]])/sprintf("\\%03o", ord($1))/ge;
6e90668e
SM
3299 return $str;
3300}
3301
b7dad2dc
RH
3302# For regexes with the /x modifier.
3303# Leave whitespace unmangled.
a9760014
RH
3304sub escape_extended_re {
3305 my($str) = @_;
cef22867 3306 $str =~ s/(.)/ord($1) > 255 ? sprintf("\\x{%x}", ord($1)) : $1/eg;
aee8fd8d
RGS
3307 $str =~ s/([[:^print:]])/
3308 ($1 =~ y! \t\n!!) ? $1 : sprintf("\\%03o", ord($1))/ge;
a9760014
RH
3309 $str =~ s/\n/\n\f/g;
3310 return $str;
3311}
3312
9d2c6865
SM
3313# Don't do this for regexen
3314sub unback {
3315 my($str) = @_;
3316 $str =~ s/\\/\\\\/g;
3317 return $str;
3318}
3319
08c6f5ec
RH
3320# Remove backslashes which precede literal control characters,
3321# to avoid creating ambiguity when we escape the latter.
3322sub re_unback {
3323 my($str) = @_;
3324
3325 # the insane complexity here is due to the behaviour of "\c\"
cef22867 3326 $str =~ s/(^|[^\\]|\\c\\)(?<!\\c)\\(\\\\)*(?=[[:^print:]])/$1$2/g;
08c6f5ec
RH
3327 return $str;
3328}
3329
6e90668e
SM
3330sub balanced_delim {
3331 my($str) = @_;
3332 my @str = split //, $str;
3333 my($ar, $open, $close, $fail, $c, $cnt);
3334 for $ar (['[',']'], ['(',')'], ['<','>'], ['{','}']) {
3335 ($open, $close) = @$ar;
3336 $fail = 0; $cnt = 0;
3337 for $c (@str) {
3338 if ($c eq $open) {
3339 $cnt++;
3340 } elsif ($c eq $close) {
3341 $cnt--;
3342 if ($cnt < 0) {
bd0865ec 3343 # qq()() isn't ")("
6e90668e
SM
3344 $fail = 1;
3345 last;
3346 }
3347 }
3348 }
3349 $fail = 1 if $cnt != 0;
3350 return ($open, "$open$str$close") if not $fail;
3351 }
3352 return ("", $str);
3353}
3354
3355sub single_delim {
3356 my($q, $default, $str) = @_;
90be192f 3357 return "$default$str$default" if $default and index($str, $default) == -1;
8347ad86
RGS
3358 if ($q ne 'qr') {
3359 (my $succeed, $str) = balanced_delim($str);
3360 return "$q$str" if $succeed;
3361 }
3362 for my $delim ('/', '"', '#') {
6e90668e
SM
3363 return "$q$delim" . $str . $delim if index($str, $delim) == -1;
3364 }
90be192f
SM
3365 if ($default) {
3366 $str =~ s/$default/\\$default/g;
3367 return "$default$str$default";
3368 } else {
3369 $str =~ s[/][\\/]g;
3370 return "$q/$str/";
3371 }
6e90668e
SM
3372}
3373
d989cdac
SM
3374my $max_prec;
3375BEGIN { $max_prec = int(0.999 + 8*length(pack("F", 42))*log(2)/log(10)); }
3376
3377# Split a floating point number into an integer mantissa and a binary
3378# exponent. Assumes you've already made sure the number isn't zero or
3379# some weird infinity or NaN.
3380sub split_float {
3381 my($f) = @_;
3382 my $exponent = 0;
3383 if ($f == int($f)) {
3384 while ($f % 2 == 0) {
3385 $f /= 2;
3386 $exponent++;
3387 }
3388 } else {
3389 while ($f != int($f)) {
3390 $f *= 2;
3391 $exponent--;
3392 }
3393 }
3394 my $mantissa = sprintf("%.0f", $f);
3395 return ($mantissa, $exponent);
3396}
3397
6e90668e 3398sub const {
d989cdac
SM
3399 my $self = shift;
3400 my($sv, $cx) = @_;
3401 if ($self->{'use_dumper'}) {
3402 return $self->const_dumper($sv, $cx);
3403 }
6e90668e 3404 if (class($sv) eq "SPECIAL") {
d989cdac
SM
3405 # sv_undef, sv_yes, sv_no
3406 return ('undef', '1', $self->maybe_parens("!1", $cx, 21))[$$sv-1];
7a9b44b9
RH
3407 } elsif (class($sv) eq "NULL") {
3408 return 'undef';
127212b2
DM
3409 }
3410 # convert a version object into the "v1.2.3" string in its V magic
3411 if ($sv->FLAGS & SVs_RMG) {
3412 for (my $mg = $sv->MAGIC; $mg; $mg = $mg->MOREMAGIC) {
3413 return $mg->PTR if $mg->TYPE eq 'V';
3414 }
3415 }
3416
3417 if ($sv->FLAGS & SVf_IOK) {
d989cdac
SM
3418 my $str = $sv->int_value;
3419 $str = $self->maybe_parens($str, $cx, 21) if $str < 0;
3420 return $str;
6e90668e 3421 } elsif ($sv->FLAGS & SVf_NOK) {
d989cdac
SM
3422 my $nv = $sv->NV;
3423 if ($nv == 0) {
3424 if (pack("F", $nv) eq pack("F", 0)) {
3425 # positive zero
3426 return "0";
3427 } else {
3428 # negative zero
3429 return $self->maybe_parens("-.0", $cx, 21);
3430 }
3431 } elsif (1/$nv == 0) {
3432 if ($nv > 0) {
3433 # positive infinity
3434 return $self->maybe_parens("9**9**9", $cx, 22);
3435 } else {
3436 # negative infinity
3437 return $self->maybe_parens("-9**9**9", $cx, 21);
3438 }
3439 } elsif ($nv != $nv) {
3440 # NaN
3441 if (pack("F", $nv) eq pack("F", sin(9**9**9))) {
3442 # the normal kind
3443 return "sin(9**9**9)";
3444 } elsif (pack("F", $nv) eq pack("F", -sin(9**9**9))) {
3445 # the inverted kind
3446 return $self->maybe_parens("-sin(9**9**9)", $cx, 21);
3447 } else {
3448 # some other kind
3449 my $hex = unpack("h*", pack("F", $nv));
3450 return qq'unpack("F", pack("h*", "$hex"))';
3451 }
fecea806 3452 }
d989cdac
SM
3453 # first, try the default stringification
3454 my $str = "$nv";
3455 if ($str != $nv) {
3456 # failing that, try using more precision
3457 $str = sprintf("%.${max_prec}g", $nv);
3458# if (pack("F", $str) ne pack("F", $nv)) {
3459 if ($str != $nv) {
3460 # not representable in decimal with whatever sprintf()
3461 # and atof() Perl is using here.
3462 my($mant, $exp) = split_float($nv);
3463 return $self->maybe_parens("$mant * 2**$exp", $cx, 19);
3464 }
3465 }
3466 $str = $self->maybe_parens($str, $cx, 21) if $nv < 0;
3467 return $str;
7a9b44b9 3468 } elsif ($sv->FLAGS & SVf_ROK && $sv->can("RV")) {
d989cdac
SM
3469 my $ref = $sv->RV;
3470 if (class($ref) eq "AV") {
3471 return "[" . $self->list_const(2, $ref->ARRAY) . "]";
3472 } elsif (class($ref) eq "HV") {
3473 my %hash = $ref->ARRAY;
3474 my @elts;
3475 for my $k (sort keys %hash) {
3476 push @elts, "$k => " . $self->const($hash{$k}, 6);
3477 }
3478 return "{" . join(", ", @elts) . "}";
3479 } elsif (class($ref) eq "CV") {
3480 return "sub " . $self->deparse_sub($ref);
3481 }
3482 if ($ref->FLAGS & SVs_SMG) {
3483 for (my $mg = $ref->MAGIC; $mg; $mg = $mg->MOREMAGIC) {
3484 if ($mg->TYPE eq 'r') {
3485 my $re = re_uninterp(escape_str(re_unback($mg->precomp)));
3486 return single_delim("qr", "", $re);
3487 }
3488 }
3489 }
3490
3491 return $self->maybe_parens("\\" . $self->const($ref, 20), $cx, 20);
34768ba5 3492 } elsif ($sv->FLAGS & SVf_POK) {
6e90668e 3493 my $str = $sv->PV;
bd0865ec 3494 if ($str =~ /[^ -~]/) { # ASCII for non-printing
9d2c6865 3495 return single_delim("qq", '"', uninterp escape_str unback $str);
6e90668e 3496 } else {
bd0865ec 3497 return single_delim("q", "'", unback $str);
6e90668e 3498 }
34768ba5
RH
3499 } else {
3500 return "undef";
a798dbf2
MB
3501 }
3502}
3503
d989cdac
SM
3504sub const_dumper {
3505 my $self = shift;
3506 my($sv, $cx) = @_;
3507 my $ref = $sv->object_2svref();
3508 my $dumper = Data::Dumper->new([$$ref], ['$v']);
3509 $dumper->Purity(1)->Terse(1)->Deparse(1)->Indent(0)->Useqq(1)->Sortkeys(1);
3510 my $str = $dumper->Dump();
3511 if ($str =~ /^\$v/) {
3512 return '${my ' . $str . ' \$v}';
3513 } else {
3514 return $str;
3515 }
3516}
3517
18228111
GS
3518sub const_sv {
3519 my $self = shift;
3520 my $op = shift;
3521 my $sv = $op->sv;
3522 # the constant could be in the pad (under useithreads)
3523 $sv = $self->padval($op->targ) unless $$sv;
3524 return $sv;
3525}
3526
6e90668e
SM
3527sub pp_const {
3528 my $self = shift;
9d2c6865 3529 my($op, $cx) = @_;
7e40138b
RH
3530 if ($op->private & OPpCONST_ARYBASE) {
3531 return '$[';
3532 }
d989cdac 3533# if ($op->private & OPpCONST_BARE) { # trouble with `=>' autoquoting
18228111 3534# return $self->const_sv($op)->PV;
6e90668e 3535# }
18228111 3536 my $sv = $self->const_sv($op);
d989cdac 3537 return $self->const($sv, $cx);
6e90668e
SM
3538}
3539
3540sub dq {
3541 my $self = shift;
3542 my $op = shift;
3f872cb9
GS
3543 my $type = $op->name;
3544 if ($type eq "const") {
f3402b25
RH
3545 return '$[' if $op->private & OPpCONST_ARYBASE;
3546 return uninterp(escape_str(unback($self->const_sv($op)->as_string)));
3f872cb9 3547 } elsif ($type eq "concat") {
8fed1104
RH
3548 my $first = $self->dq($op->first);
3549 my $last = $self->dq($op->last);
44c6d2a1 3550
333f3d7a 3551 # Disambiguate "${foo}bar", "${foo}{bar}", "${foo}[1]", "$foo\::bar"
44c6d2a1
RH
3552 ($last =~ /^[A-Z\\\^\[\]_?]/ &&
3553 $first =~ s/([\$@])\^$/${1}{^}/) # "${^}W" etc
d989cdac 3554 || ($last =~ /^[:'{\[\w_]/ && #'
44c6d2a1
RH
3555 $first =~ s/([\$@])([A-Za-z_]\w*)$/${1}{$2}/);
3556
8fed1104 3557 return $first . $last;
3f872cb9 3558 } elsif ($type eq "uc") {
6e90668e 3559 return '\U' . $self->dq($op->first->sibling) . '\E';
3f872cb9 3560 } elsif ($type eq "lc") {
6e90668e 3561 return '\L' . $self->dq($op->first->sibling) . '\E';
3f872cb9 3562 } elsif ($type eq "ucfirst") {
6e90668e 3563 return '\u' . $self->dq($op->first->sibling);
3f872cb9 3564 } elsif ($type eq "lcfirst") {
6e90668e 3565 return '\l' . $self->dq($op->first->sibling);
3f872cb9 3566 } elsif ($type eq "quotemeta") {
6e90668e 3567 return '\Q' . $self->dq($op->first->sibling) . '\E';
3f872cb9 3568 } elsif ($type eq "join") {