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/* perly.y
*
* Copyright (c) 1991-2002, 2003, 2004, 2005, 2006 Larry Wall
* Copyright (c) 2007, 2008, 2009, 2010, 2011 by Larry Wall and others
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
*/
/*
* 'I see,' laughed Strider. 'I look foul and feel fair. Is that it?
* All that is gold does not glitter, not all those who wander are lost.'
*
* [p.171 of _The Lord of the Rings_, I/x: "Strider"]
*/
/*
* This file holds the grammar for the Perl language. If edited, you need
* to run regen_perly.pl, which re-creates the files perly.h, perly.tab
* and perly.act which are derived from this.
*
* The main job of this grammar is to call the various newFOO()
* functions in op.c to build a syntax tree of OP structs.
* It relies on the lexer in toke.c to do the tokenizing.
*
* Note: due to the way that the cleanup code works WRT to freeing ops on
* the parse stack, it is dangerous to assign to the $n variables within
* an action.
*/
/* Make the parser re-entrant. */
%define api.pure
%start grammar
%union {
I32 ival; /* __DEFAULT__ (marker for regen_perly.pl;
must always be 1st union member) */
char *pval;
OP *opval;
GV *gvval;
}
%token <ival> GRAMPROG GRAMEXPR GRAMBLOCK GRAMBARESTMT GRAMFULLSTMT GRAMSTMTSEQ GRAMSUBSIGNATURE
%token <ival> PERLY_AMPERSAND
%token <ival> PERLY_BRACE_OPEN
%token <ival> PERLY_BRACE_CLOSE
%token <ival> PERLY_BRACKET_OPEN
%token <ival> PERLY_BRACKET_CLOSE
%token <ival> PERLY_COMMA
%token <ival> PERLY_DOLLAR
%token <ival> PERLY_DOT
%token <ival> PERLY_EQUAL_SIGN
%token <ival> PERLY_MINUS
%token <ival> PERLY_PERCENT_SIGN
%token <ival> PERLY_PLUS
%token <ival> PERLY_SEMICOLON
%token <ival> PERLY_SLASH
%token <ival> PERLY_SNAIL
%token <ival> PERLY_STAR
%token <opval> BAREWORD METHOD FUNCMETH THING PMFUNC PRIVATEREF QWLIST
%token <opval> FUNC0OP FUNC0SUB UNIOPSUB LSTOPSUB
%token <opval> PLUGEXPR PLUGSTMT
%token <opval> LABEL
%token <ival> FORMAT SUB SIGSUB ANONSUB ANON_SIGSUB PACKAGE USE
%token <ival> WHILE UNTIL IF UNLESS ELSE ELSIF CONTINUE FOR
%token <ival> GIVEN WHEN DEFAULT
%token <ival> TRY CATCH FINALLY
%token <ival> LOOPEX DOTDOT YADAYADA
%token <ival> FUNC0 FUNC1 FUNC UNIOP LSTOP
%token <ival> MULOP ADDOP
%token <ival> DOLSHARP DO HASHBRACK NOAMP
%token <ival> LOCAL MY REQUIRE
%token <ival> COLONATTR FORMLBRACK FORMRBRACK
%token <ival> SUBLEXSTART SUBLEXEND
%token <ival> DEFER
%type <ival> grammar remember mremember
%type <ival> startsub startanonsub startformsub
%type <ival> mintro
%type <opval> stmtseq fullstmt labfullstmt barestmt block mblock else finally
%type <opval> expr term subscripted scalar ary hsh arylen star amper sideff
%type <opval> condition
%type <opval> empty
%type <opval> sliceme kvslice gelem
%type <opval> listexpr nexpr texpr iexpr mexpr mnexpr
%type <opval> optlistexpr optexpr optrepl indirob listop method
%type <opval> formname subname proto cont my_scalar my_var
%type <opval> list_of_scalars my_list_of_scalars refgen_topic formblock
%type <opval> subattrlist myattrlist myattrterm myterm
%type <opval> termbinop termunop anonymous termdo
%type <opval> termrelop relopchain termeqop eqopchain
%type <ival> sigslurpsigil
%type <opval> sigvarname sigdefault sigscalarelem sigslurpelem
%type <opval> sigelem siglist optsiglist subsigguts subsignature optsubsignature
%type <opval> subbody optsubbody sigsubbody optsigsubbody
%type <opval> formstmtseq formline formarg
%nonassoc <ival> PREC_LOW
%nonassoc LOOPEX
%left <ival> OROP
%left <ival> ANDOP
%right <ival> NOTOP
%nonassoc LSTOP LSTOPSUB
%left PERLY_COMMA
%right <ival> ASSIGNOP
%right <ival> PERLY_QUESTION_MARK PERLY_COLON
%nonassoc DOTDOT
%left <ival> OROR DORDOR
%left <ival> ANDAND
%left <ival> BITOROP
%left <ival> BITANDOP
%left <ival> CHEQOP NCEQOP
%left <ival> CHRELOP NCRELOP
%nonassoc UNIOP UNIOPSUB
%nonassoc REQUIRE
%left <ival> SHIFTOP
%left ADDOP
%left MULOP
%left <ival> MATCHOP
%right <ival> PERLY_EXCLAMATION_MARK PERLY_TILDE UMINUS REFGEN
%right <ival> POWOP
%nonassoc <ival> PREINC PREDEC POSTINC POSTDEC POSTJOIN
%left <ival> ARROW
%nonassoc <ival> PERLY_PAREN_CLOSE
%left <ival> PERLY_PAREN_OPEN
%left PERLY_BRACKET_OPEN PERLY_BRACE_OPEN
%% /* RULES */
/* Top-level choice of what kind of thing yyparse was called to parse */
grammar : GRAMPROG
{
parser->expect = XSTATE;
$<ival>$ = 0;
}
remember stmtseq
{
newPROG(block_end($remember,$stmtseq));
PL_compiling.cop_seq = 0;
$$ = 0;
}
| GRAMEXPR
{
parser->expect = XTERM;
$<ival>$ = 0;
}
optexpr
{
PL_eval_root = $optexpr;
$$ = 0;
}
| GRAMBLOCK
{
parser->expect = XBLOCK;
$<ival>$ = 0;
}
block
{
PL_pad_reset_pending = TRUE;
PL_eval_root = $block;
$$ = 0;
yyunlex();
parser->yychar = yytoken = YYEOF;
}
| GRAMBARESTMT
{
parser->expect = XSTATE;
$<ival>$ = 0;
}
barestmt
{
PL_pad_reset_pending = TRUE;
PL_eval_root = $barestmt;
$$ = 0;
yyunlex();
parser->yychar = yytoken = YYEOF;
}
| GRAMFULLSTMT
{
parser->expect = XSTATE;
$<ival>$ = 0;
}
fullstmt
{
PL_pad_reset_pending = TRUE;
PL_eval_root = $fullstmt;
$$ = 0;
yyunlex();
parser->yychar = yytoken = YYEOF;
}
| GRAMSTMTSEQ
{
parser->expect = XSTATE;
$<ival>$ = 0;
}
stmtseq
{
PL_eval_root = $stmtseq;
$$ = 0;
}
| GRAMSUBSIGNATURE
{
parser->expect = XSTATE;
$<ival>$ = 0;
}
subsigguts
{
PL_eval_root = $subsigguts;
$$ = 0;
}
;
/* An ordinary block */
block : PERLY_BRACE_OPEN remember stmtseq PERLY_BRACE_CLOSE
{ if (parser->copline > (line_t)$PERLY_BRACE_OPEN)
parser->copline = (line_t)$PERLY_BRACE_OPEN;
$$ = block_end($remember, $stmtseq);
}
;
empty
: %empty { $$ = NULL; }
;
/* format body */
formblock: PERLY_EQUAL_SIGN remember PERLY_SEMICOLON FORMRBRACK formstmtseq PERLY_SEMICOLON PERLY_DOT
{ if (parser->copline > (line_t)$PERLY_EQUAL_SIGN)
parser->copline = (line_t)$PERLY_EQUAL_SIGN;
$$ = block_end($remember, $formstmtseq);
}
;
remember: %empty /* start a full lexical scope */
{ $$ = block_start(TRUE);
parser->parsed_sub = 0; }
;
mblock : PERLY_BRACE_OPEN mremember stmtseq PERLY_BRACE_CLOSE
{ if (parser->copline > (line_t)$PERLY_BRACE_OPEN)
parser->copline = (line_t)$PERLY_BRACE_OPEN;
$$ = block_end($mremember, $stmtseq);
}
;
mremember: %empty /* start a partial lexical scope */
{ $$ = block_start(FALSE);
parser->parsed_sub = 0; }
;
/* A sequence of statements in the program */
stmtseq
: empty
| stmtseq[list] fullstmt
{ $$ = op_append_list(OP_LINESEQ, $list, $fullstmt);
PL_pad_reset_pending = TRUE;
if ($list && $fullstmt)
PL_hints |= HINT_BLOCK_SCOPE;
}
;
/* A sequence of format lines */
formstmtseq
: empty
| formstmtseq[list] formline
{ $$ = op_append_list(OP_LINESEQ, $list, $formline);
PL_pad_reset_pending = TRUE;
if ($list && $formline)
PL_hints |= HINT_BLOCK_SCOPE;
}
;
/* A statement in the program, including optional labels */
fullstmt: barestmt
{
$$ = $barestmt ? newSTATEOP(0, NULL, $barestmt) : NULL;
}
| labfullstmt
{ $$ = $labfullstmt; }
;
labfullstmt: LABEL barestmt
{
SV *label = cSVOPx_sv($LABEL);
$$ = newSTATEOP(SvFLAGS(label) & SVf_UTF8,
savepv(SvPVX_const(label)), $barestmt);
op_free($LABEL);
}
| LABEL labfullstmt[list]
{
SV *label = cSVOPx_sv($LABEL);
$$ = newSTATEOP(SvFLAGS(label) & SVf_UTF8,
savepv(SvPVX_const(label)), $list);
op_free($LABEL);
}
;
/* A bare statement, lacking label and other aspects of state op */
barestmt: PLUGSTMT
{ $$ = $PLUGSTMT; }
| FORMAT startformsub formname formblock
{
CV *fmtcv = PL_compcv;
newFORM($startformsub, $formname, $formblock);
$$ = NULL;
if (CvOUTSIDE(fmtcv) && !CvEVAL(CvOUTSIDE(fmtcv))) {
pad_add_weakref(fmtcv);
}
parser->parsed_sub = 1;
}
| SUB subname startsub
/* sub declaration or definition not within scope
of 'use feature "signatures"'*/
{
init_named_cv(PL_compcv, $subname);
parser->in_my = 0;
parser->in_my_stash = NULL;
}
proto subattrlist optsubbody
{
SvREFCNT_inc_simple_void(PL_compcv);
$subname->op_type == OP_CONST
? newATTRSUB($startsub, $subname, $proto, $subattrlist, $optsubbody)
: newMYSUB($startsub, $subname, $proto, $subattrlist, $optsubbody)
;
$$ = NULL;
intro_my();
parser->parsed_sub = 1;
}
| SIGSUB subname startsub
/* sub declaration or definition under 'use feature
* "signatures"'. (Note that a signature isn't
* allowed in a declaration)
*/
{
init_named_cv(PL_compcv, $subname);
parser->in_my = 0;
parser->in_my_stash = NULL;
}
subattrlist optsigsubbody
{
SvREFCNT_inc_simple_void(PL_compcv);
$subname->op_type == OP_CONST
? newATTRSUB($startsub, $subname, NULL, $subattrlist, $optsigsubbody)
: newMYSUB( $startsub, $subname, NULL, $subattrlist, $optsigsubbody)
;
$$ = NULL;
intro_my();
parser->parsed_sub = 1;
}
| PACKAGE BAREWORD[version] BAREWORD[package] PERLY_SEMICOLON
{
package($package);
if ($version)
package_version($version);
$$ = NULL;
}
| USE startsub
{ CvSPECIAL_on(PL_compcv); /* It's a BEGIN {} */ }
BAREWORD[version] BAREWORD[module] optlistexpr PERLY_SEMICOLON
{
SvREFCNT_inc_simple_void(PL_compcv);
utilize($USE, $startsub, $version, $module, $optlistexpr);
parser->parsed_sub = 1;
$$ = NULL;
}
| IF PERLY_PAREN_OPEN remember mexpr PERLY_PAREN_CLOSE mblock else
{
$$ = block_end($remember,
newCONDOP(0, $mexpr, op_scope($mblock), $else));
parser->copline = (line_t)$IF;
}
| UNLESS PERLY_PAREN_OPEN remember mexpr PERLY_PAREN_CLOSE mblock else
{
$$ = block_end($remember,
newCONDOP(0, $mexpr, $else, op_scope($mblock)));
parser->copline = (line_t)$UNLESS;
}
| GIVEN PERLY_PAREN_OPEN remember mexpr PERLY_PAREN_CLOSE mblock
{
$$ = block_end($remember, newGIVENOP($mexpr, op_scope($mblock), 0));
parser->copline = (line_t)$GIVEN;
}
| WHEN PERLY_PAREN_OPEN remember mexpr PERLY_PAREN_CLOSE mblock
{ $$ = block_end($remember, newWHENOP($mexpr, op_scope($mblock))); }
| DEFAULT block
{ $$ = newWHENOP(0, op_scope($block)); }
| WHILE PERLY_PAREN_OPEN remember texpr PERLY_PAREN_CLOSE mintro mblock cont
{
$$ = block_end($remember,
newWHILEOP(0, 1, NULL,
$texpr, $mblock, $cont, $mintro));
parser->copline = (line_t)$WHILE;
}
| UNTIL PERLY_PAREN_OPEN remember iexpr PERLY_PAREN_CLOSE mintro mblock cont
{
$$ = block_end($remember,
newWHILEOP(0, 1, NULL,
$iexpr, $mblock, $cont, $mintro));
parser->copline = (line_t)$UNTIL;
}
| FOR PERLY_PAREN_OPEN remember mnexpr[init_mnexpr] PERLY_SEMICOLON
{ parser->expect = XTERM; }
texpr PERLY_SEMICOLON
{ parser->expect = XTERM; }
mintro mnexpr[iterate_mnexpr] PERLY_PAREN_CLOSE
mblock
{
OP *initop = $init_mnexpr;
OP *forop = newWHILEOP(0, 1, NULL,
scalar($texpr), $mblock, $iterate_mnexpr, $mintro);
if (initop) {
forop = op_prepend_elem(OP_LINESEQ, initop,
op_append_elem(OP_LINESEQ,
newOP(OP_UNSTACK, OPf_SPECIAL),
forop));
}
PL_hints |= HINT_BLOCK_SCOPE;
$$ = block_end($remember, forop);
parser->copline = (line_t)$FOR;
}
| FOR MY remember my_scalar PERLY_PAREN_OPEN mexpr PERLY_PAREN_CLOSE mblock cont
{
$$ = block_end($remember, newFOROP(0, $my_scalar, $mexpr, $mblock, $cont));
parser->copline = (line_t)$FOR;
}
| FOR MY remember PERLY_PAREN_OPEN my_list_of_scalars PERLY_PAREN_CLOSE PERLY_PAREN_OPEN mexpr PERLY_PAREN_CLOSE mblock cont
{
if ($my_list_of_scalars->op_type == OP_PADSV)
/* degenerate case of 1 var: for my ($x) ....
Flag it so it can be special-cased in newFOROP */
$my_list_of_scalars->op_flags |= OPf_PARENS;
$$ = block_end($remember, newFOROP(0, $my_list_of_scalars, $mexpr, $mblock, $cont));
parser->copline = (line_t)$FOR;
}
| FOR scalar PERLY_PAREN_OPEN remember mexpr PERLY_PAREN_CLOSE mblock cont
{
$$ = block_end($remember, newFOROP(0,
op_lvalue($scalar, OP_ENTERLOOP), $mexpr, $mblock, $cont));
parser->copline = (line_t)$FOR;
}
| FOR my_refgen remember my_var
{ parser->in_my = 0; $<opval>$ = my($my_var); }[variable]
PERLY_PAREN_OPEN mexpr PERLY_PAREN_CLOSE mblock cont
{
$$ = block_end(
$remember,
newFOROP(0,
op_lvalue(
newUNOP(OP_REFGEN, 0,
$<opval>variable),
OP_ENTERLOOP),
$mexpr, $mblock, $cont)
);
parser->copline = (line_t)$FOR;
}
| FOR REFGEN refgen_topic PERLY_PAREN_OPEN remember mexpr PERLY_PAREN_CLOSE mblock cont
{
$$ = block_end($remember, newFOROP(
0, op_lvalue(newUNOP(OP_REFGEN, 0,
$refgen_topic),
OP_ENTERLOOP), $mexpr, $mblock, $cont));
parser->copline = (line_t)$FOR;
}
| FOR PERLY_PAREN_OPEN remember mexpr PERLY_PAREN_CLOSE mblock cont
{
$$ = block_end($remember,
newFOROP(0, NULL, $mexpr, $mblock, $cont));
parser->copline = (line_t)$FOR;
}
| TRY mblock[try] CATCH PERLY_PAREN_OPEN
{ parser->in_my = 1; }
remember scalar
{ parser->in_my = 0; intro_my(); }
PERLY_PAREN_CLOSE mblock[catch] finally
{
$$ = newTRYCATCHOP(0,
$try, $scalar, block_end($remember, op_scope($catch)));
if($finally)
$$ = op_wrap_finally($$, $finally);
parser->copline = (line_t)$TRY;
}
| block cont
{
/* a block is a loop that happens once */
$$ = newWHILEOP(0, 1, NULL,
NULL, $block, $cont, 0);
}
| PACKAGE BAREWORD[version] BAREWORD[package] PERLY_BRACE_OPEN remember
{
package($package);
if ($version) {
package_version($version);
}
}
stmtseq PERLY_BRACE_CLOSE
{
/* a block is a loop that happens once */
$$ = newWHILEOP(0, 1, NULL,
NULL, block_end($remember, $stmtseq), NULL, 0);
if (parser->copline > (line_t)$PERLY_BRACE_OPEN)
parser->copline = (line_t)$PERLY_BRACE_OPEN;
}
| sideff PERLY_SEMICOLON
{
$$ = $sideff;
}
| DEFER mblock
{
$$ = newDEFEROP(0, op_scope($2));
}
| YADAYADA PERLY_SEMICOLON
{
$$ = newLISTOP(OP_DIE, 0, newOP(OP_PUSHMARK, 0),
newSVOP(OP_CONST, 0, newSVpvs("Unimplemented")));
}
| PERLY_SEMICOLON
{
$$ = NULL;
parser->copline = NOLINE;
}
;
/* Format line */
formline: THING formarg
{ OP *list;
if ($formarg) {
OP *term = $formarg;
list = op_append_elem(OP_LIST, $THING, term);
}
else {
list = $THING;
}
if (parser->copline == NOLINE)
parser->copline = CopLINE(PL_curcop)-1;
else parser->copline--;
$$ = newSTATEOP(0, NULL,
op_convert_list(OP_FORMLINE, 0, list));
}
;
formarg
: empty
| FORMLBRACK stmtseq FORMRBRACK
{ $$ = op_unscope($stmtseq); }
;
condition: expr
;
/* An expression which may have a side-effect */
sideff : error
{ $$ = NULL; }
| expr[body]
{ $$ = $body; }
| expr[body] IF condition
{ $$ = newLOGOP(OP_AND, 0, $condition, $body); }
| expr[body] UNLESS condition
{ $$ = newLOGOP(OP_OR, 0, $condition, $body); }
| expr[body] WHILE condition
{ $$ = newLOOPOP(OPf_PARENS, 1, scalar($condition), $body); }
| expr[body] UNTIL iexpr
{ $$ = newLOOPOP(OPf_PARENS, 1, $iexpr, $body); }
| expr[body] FOR condition
{ $$ = newFOROP(0, NULL, $condition, $body, NULL);
parser->copline = (line_t)$FOR; }
| expr[body] WHEN condition
{ $$ = newWHENOP($condition, op_scope($body)); }
;
/* else and elsif blocks */
else
: empty
| ELSE mblock
{
($mblock)->op_flags |= OPf_PARENS;
$$ = op_scope($mblock);
}
| ELSIF PERLY_PAREN_OPEN mexpr PERLY_PAREN_CLOSE mblock else[else.recurse]
{ parser->copline = (line_t)$ELSIF;
$$ = newCONDOP(0,
newSTATEOP(OPf_SPECIAL,NULL,$mexpr),
op_scope($mblock), $[else.recurse]);
PL_hints |= HINT_BLOCK_SCOPE;
}
;
/* Continue blocks */
cont
: empty
| CONTINUE block
{ $$ = op_scope($block); }
;
/* Finally blocks */
finally : %empty
{ $$ = NULL; }
| FINALLY block
{ $$ = op_scope($block); }
;
/* determine whether there are any new my declarations */
mintro : %empty
{ $$ = (PL_min_intro_pending &&
PL_max_intro_pending >= PL_min_intro_pending);
intro_my(); }
/* Normal expression */
nexpr
: empty
| sideff
;
/* Boolean expression */
texpr : %empty /* NULL means true */
{ YYSTYPE tmplval;
(void)scan_num("1", &tmplval);
$$ = tmplval.opval; }
| expr
;
/* Inverted boolean expression */
iexpr : expr
{ $$ = invert(scalar($expr)); }
;
/* Expression with its own lexical scope */
mexpr : expr
{ $$ = $expr; intro_my(); }
;
mnexpr : nexpr
{ $$ = $nexpr; intro_my(); }
;
formname: BAREWORD { $$ = $BAREWORD; }
| empty
;
startsub: %empty /* start a regular subroutine scope */
{ $$ = start_subparse(FALSE, 0);
SAVEFREESV(PL_compcv); }
;
startanonsub: %empty /* start an anonymous subroutine scope */
{ $$ = start_subparse(FALSE, CVf_ANON);
SAVEFREESV(PL_compcv); }
;
startformsub: %empty /* start a format subroutine scope */
{ $$ = start_subparse(TRUE, 0);
SAVEFREESV(PL_compcv); }
;
/* Name of a subroutine - must be a bareword, could be special */
subname : BAREWORD
| PRIVATEREF
;
/* Subroutine prototype */
proto
: empty
| THING
;
/* Optional list of subroutine attributes */
subattrlist
: empty
| COLONATTR THING
{ $$ = $THING; }
| COLONATTR
{ $$ = NULL; }
;
/* List of attributes for a "my" variable declaration */
myattrlist: COLONATTR THING
{ $$ = $THING; }
| COLONATTR
{ $$ = NULL; }
;
/* --------------------------------------
* subroutine signature parsing
*/
/* the '' or 'foo' part of a '$' or '@foo' etc signature variable */
sigvarname: %empty
{ parser->in_my = 0; $$ = NULL; }
| PRIVATEREF
{ parser->in_my = 0; $$ = $PRIVATEREF; }
;
sigslurpsigil:
PERLY_SNAIL
{ $$ = '@'; }
| PERLY_PERCENT_SIGN
{ $$ = '%'; }
/* @, %, @foo, %foo */
sigslurpelem: sigslurpsigil sigvarname sigdefault/* def only to catch errors */
{
I32 sigil = $sigslurpsigil;
OP *var = $sigvarname;
OP *defexpr = $sigdefault;
if (parser->sig_slurpy)
yyerror("Multiple slurpy parameters not allowed");
parser->sig_slurpy = (char)sigil;
if (defexpr)
yyerror("A slurpy parameter may not have "
"a default value");
$$ = var ? newSTATEOP(0, NULL, var) : NULL;
}
;
/* default part of sub signature scalar element: i.e. '= default_expr' */
sigdefault
: empty
| ASSIGNOP
{ $$ = newOP(OP_NULL, 0); }
| ASSIGNOP term
{ $$ = $term; }
/* subroutine signature scalar element: e.g. '$x', '$=', '$x = $default' */
sigscalarelem:
PERLY_DOLLAR sigvarname sigdefault
{
OP *var = $sigvarname;
OP *defexpr = $sigdefault;
if (parser->sig_slurpy)
yyerror("Slurpy parameter not last");
parser->sig_elems++;
if (defexpr) {
parser->sig_optelems++;
if ( defexpr->op_type == OP_NULL
&& !(defexpr->op_flags & OPf_KIDS))
{
/* handle '$=' special case */
if (var)
yyerror("Optional parameter "
"lacks default expression");
op_free(defexpr);
}
else {
/* a normal '=default' expression */
OP *defop = (OP*)alloc_LOGOP(OP_ARGDEFELEM,
defexpr,
LINKLIST(defexpr));
/* re-purpose op_targ to hold @_ index */
defop->op_targ =
(PADOFFSET)(parser->sig_elems - 1);
if (var) {
var->op_flags |= OPf_STACKED;
(void)op_sibling_splice(var,
NULL, 0, defop);
scalar(defop);
}
else
var = newUNOP(OP_NULL, 0, defop);
LINKLIST(var);
/* NB: normally the first child of a
* logop is executed before the logop,
* and it pushes a boolean result
* ready for the logop. For ARGDEFELEM,
* the op itself does the boolean
* calculation, so set the first op to
* it instead.
*/
var->op_next = defop;
defexpr->op_next = var;
}
}
else {
if (parser->sig_optelems)
yyerror("Mandatory parameter "
"follows optional parameter");
}
$$ = var ? newSTATEOP(0, NULL, var) : NULL;
}
;
/* subroutine signature element: e.g. '$x = $default' or '%h' */
sigelem: sigscalarelem
{ parser->in_my = KEY_sigvar; $$ = $sigscalarelem; }
| sigslurpelem
{ parser->in_my = KEY_sigvar; $$ = $sigslurpelem; }
;
/* list of subroutine signature elements */
siglist:
siglist[list] PERLY_COMMA
{ $$ = $list; }
| siglist[list] PERLY_COMMA sigelem[element]
{
$$ = op_append_list(OP_LINESEQ, $list, $element);
}
| sigelem[element] %prec PREC_LOW
{ $$ = $element; }
;
/* () or (....) */
optsiglist
: empty
| siglist
;
/* optional subroutine signature */
optsubsignature
: empty
| subsignature
;
/* Subroutine signature */
subsignature: PERLY_PAREN_OPEN subsigguts PERLY_PAREN_CLOSE
{ $$ = $subsigguts; }
subsigguts:
{
ENTER;
SAVEIV(parser->sig_elems);
SAVEIV(parser->sig_optelems);
SAVEI8(parser->sig_slurpy);
parser->sig_elems = 0;
parser->sig_optelems = 0;
parser->sig_slurpy = 0;
parser->in_my = KEY_sigvar;
}
optsiglist
{
OP *sigops = $optsiglist;
struct op_argcheck_aux *aux;
OP *check;
if (!FEATURE_SIGNATURES_IS_ENABLED)
Perl_croak(aTHX_ "Experimental "
"subroutine signatures not enabled");
/* We shouldn't get here otherwise */
aux = (struct op_argcheck_aux*)
PerlMemShared_malloc(
sizeof(struct op_argcheck_aux));
aux->params = parser->sig_elems;
aux->opt_params = parser->sig_optelems;
aux->slurpy = parser->sig_slurpy;
check = newUNOP_AUX(OP_ARGCHECK, 0, NULL,
(UNOP_AUX_item *)aux);
sigops = op_prepend_elem(OP_LINESEQ, check, sigops);
sigops = op_prepend_elem(OP_LINESEQ,
newSTATEOP(0, NULL, NULL),
sigops);
/* a nextstate at the end handles context
* correctly for an empty sub body */
sigops = op_append_elem(OP_LINESEQ,
sigops,
newSTATEOP(0, NULL, NULL));
/* wrap the list of arg ops in a NULL aux op.
This serves two purposes. First, it makes
the arg list a separate subtree from the
body of the sub, and secondly the null op
may in future be upgraded to an OP_SIGNATURE
when implemented. For now leave it as
ex-argcheck */
$$ = newUNOP_AUX(OP_ARGCHECK, 0, sigops, NULL);
op_null($$);
CvSIGNATURE_on(PL_compcv);
parser->in_my = 0;
/* tell the toker that attrributes can follow
* this sig, but only so that the toker
* can skip through any (illegal) trailing
* attribute text then give a useful error
* message about "attributes before sig",
* rather than falling over ina mess at
* unrecognised syntax.
*/
parser->expect = XATTRBLOCK;
parser->sig_seen = TRUE;
LEAVE;
}
;
/* Optional subroutine body (for named subroutine declaration) */
optsubbody
: subbody
| PERLY_SEMICOLON { $$ = NULL; }
;
/* Subroutine body (without signature) */
subbody: remember PERLY_BRACE_OPEN stmtseq PERLY_BRACE_CLOSE
{
if (parser->copline > (line_t)$PERLY_BRACE_OPEN)
parser->copline = (line_t)$PERLY_BRACE_OPEN;
$$ = block_end($remember, $stmtseq);
}
;
/* optional [ Subroutine body with optional signature ] (for named
* subroutine declaration) */
optsigsubbody
: sigsubbody
| PERLY_SEMICOLON { $$ = NULL; }
;
/* Subroutine body with optional signature */
sigsubbody: remember optsubsignature PERLY_BRACE_OPEN stmtseq PERLY_BRACE_CLOSE
{
if (parser->copline > (line_t)$PERLY_BRACE_OPEN)
parser->copline = (line_t)$PERLY_BRACE_OPEN;
$$ = block_end($remember,
op_append_list(OP_LINESEQ, $optsubsignature, $stmtseq));
}
;
/* Ordinary expressions; logical combinations */
expr : expr[lhs] ANDOP expr[rhs]
{ $$ = newLOGOP(OP_AND, 0, $lhs, $rhs); }
| expr[lhs] OROP[operator] expr[rhs]
{ $$ = newLOGOP($operator, 0, $lhs, $rhs); }
| listexpr %prec PREC_LOW
;
/* Expressions are a list of terms joined by commas */
listexpr: listexpr[list] PERLY_COMMA
{ $$ = $list; }
| listexpr[list] PERLY_COMMA term
{
OP* term = $term;
$$ = op_append_elem(OP_LIST, $list, term);
}
| term %prec PREC_LOW
;
/* List operators */
listop : LSTOP indirob listexpr /* map {...} @args or print $fh @args */
{ $$ = op_convert_list($LSTOP, OPf_STACKED,
op_prepend_elem(OP_LIST, newGVREF($LSTOP,$indirob), $listexpr) );
}
| FUNC PERLY_PAREN_OPEN indirob expr PERLY_PAREN_CLOSE /* print ($fh @args */
{ $$ = op_convert_list($FUNC, OPf_STACKED,
op_prepend_elem(OP_LIST, newGVREF($FUNC,$indirob), $expr) );
}
| term ARROW method PERLY_PAREN_OPEN optexpr PERLY_PAREN_CLOSE /* $foo->bar(list) */
{ $$ = op_convert_list(OP_ENTERSUB, OPf_STACKED,
op_append_elem(OP_LIST,
op_prepend_elem(OP_LIST, scalar($term), $optexpr),
newMETHOP(OP_METHOD, 0, $method)));
}
| term ARROW method /* $foo->bar */
{ $$ = op_convert_list(OP_ENTERSUB, OPf_STACKED,
op_append_elem(OP_LIST, scalar($term),
newMETHOP(OP_METHOD, 0, $method)));
}
| METHOD indirob optlistexpr /* new Class @args */
{ $$ = op_convert_list(OP_ENTERSUB, OPf_STACKED,
op_append_elem(OP_LIST,
op_prepend_elem(OP_LIST, $indirob, $optlistexpr),
newMETHOP(OP_METHOD, 0, $METHOD)));
}
| FUNCMETH indirob PERLY_PAREN_OPEN optexpr PERLY_PAREN_CLOSE /* method $object (@args) */
{ $$ = op_convert_list(OP_ENTERSUB, OPf_STACKED,
op_append_elem(OP_LIST,
op_prepend_elem(OP_LIST, $indirob, $optexpr),
newMETHOP(OP_METHOD, 0, $FUNCMETH)));
}
| LSTOP optlistexpr /* print @args */
{ $$ = op_convert_list($LSTOP, 0, $optlistexpr); }
| FUNC PERLY_PAREN_OPEN optexpr PERLY_PAREN_CLOSE /* print (@args) */
{ $$ = op_convert_list($FUNC, 0, $optexpr); }
| FUNC SUBLEXSTART optexpr SUBLEXEND /* uc($arg) from "\U..." */
{ $$ = op_convert_list($FUNC, 0, $optexpr); }
| LSTOPSUB startanonsub block /* sub f(&@); f { foo } ... */
{ SvREFCNT_inc_simple_void(PL_compcv);
$<opval>$ = newANONATTRSUB($startanonsub, 0, NULL, $block); }[anonattrsub]
optlistexpr %prec LSTOP /* ... @bar */
{ $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
op_append_elem(OP_LIST,
op_prepend_elem(OP_LIST, $<opval>anonattrsub, $optlistexpr), $LSTOPSUB));
}
;
/* Names of methods. May use $object->$methodname */
method : METHOD
| scalar
;
/* Some kind of subscripted expression */
subscripted: gelem PERLY_BRACE_OPEN expr PERLY_SEMICOLON PERLY_BRACE_CLOSE /* *main::{something} */
/* In this and all the hash accessors, PERLY_SEMICOLON is
* provided by the tokeniser */
{ $$ = newBINOP(OP_GELEM, 0, $gelem, scalar($expr)); }
| scalar[array] PERLY_BRACKET_OPEN expr PERLY_BRACKET_CLOSE /* $array[$element] */
{ $$ = newBINOP(OP_AELEM, 0, oopsAV($array), scalar($expr));
}
| term[array_reference] ARROW PERLY_BRACKET_OPEN expr PERLY_BRACKET_CLOSE /* somearef->[$element] */
{ $$ = newBINOP(OP_AELEM, 0,
ref(newAVREF($array_reference),OP_RV2AV),
scalar($expr));
}
| subscripted[array_reference] PERLY_BRACKET_OPEN expr PERLY_BRACKET_CLOSE /* $foo->[$bar]->[$baz] */
{ $$ = newBINOP(OP_AELEM, 0,
ref(newAVREF($array_reference),OP_RV2AV),
scalar($expr));
}
| scalar[hash] PERLY_BRACE_OPEN expr PERLY_SEMICOLON PERLY_BRACE_CLOSE /* $foo{bar();} */
{ $$ = newBINOP(OP_HELEM, 0, oopsHV($hash), jmaybe($expr));
}
| term[hash_reference] ARROW PERLY_BRACE_OPEN expr PERLY_SEMICOLON PERLY_BRACE_CLOSE /* somehref->{bar();} */
{ $$ = newBINOP(OP_HELEM, 0,
ref(newHVREF($hash_reference),OP_RV2HV),
jmaybe($expr)); }
| subscripted[hash_reference] PERLY_BRACE_OPEN expr PERLY_SEMICOLON PERLY_BRACE_CLOSE /* $foo->[bar]->{baz;} */
{ $$ = newBINOP(OP_HELEM, 0,
ref(newHVREF($hash_reference),OP_RV2HV),
jmaybe($expr)); }
| term[code_reference] ARROW PERLY_PAREN_OPEN PERLY_PAREN_CLOSE /* $subref->() */
{ $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
newCVREF(0, scalar($code_reference)));
if (parser->expect == XBLOCK)
parser->expect = XOPERATOR;
}
| term[code_reference] ARROW PERLY_PAREN_OPEN expr PERLY_PAREN_CLOSE /* $subref->(@args) */
{ $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
op_append_elem(OP_LIST, $expr,
newCVREF(0, scalar($code_reference))));
if (parser->expect == XBLOCK)
parser->expect = XOPERATOR;
}
| subscripted[code_reference] PERLY_PAREN_OPEN expr PERLY_PAREN_CLOSE /* $foo->{bar}->(@args) */
{ $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
op_append_elem(OP_LIST, $expr,
newCVREF(0, scalar($code_reference))));
if (parser->expect == XBLOCK)
parser->expect = XOPERATOR;
}
| subscripted[code_reference] PERLY_PAREN_OPEN PERLY_PAREN_CLOSE /* $foo->{bar}->() */
{ $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
newCVREF(0, scalar($code_reference)));
if (parser->expect == XBLOCK)
parser->expect = XOPERATOR;
}
| PERLY_PAREN_OPEN expr[list] PERLY_PAREN_CLOSE PERLY_BRACKET_OPEN expr[slice] PERLY_BRACKET_CLOSE /* list slice */
{ $$ = newSLICEOP(0, $slice, $list); }
| QWLIST PERLY_BRACKET_OPEN expr PERLY_BRACKET_CLOSE /* list literal slice */
{ $$ = newSLICEOP(0, $expr, $QWLIST); }
| PERLY_PAREN_OPEN PERLY_PAREN_CLOSE PERLY_BRACKET_OPEN expr PERLY_BRACKET_CLOSE /* empty list slice! */
{ $$ = newSLICEOP(0, $expr, NULL); }
;
/* Binary operators between terms */
termbinop: term[lhs] ASSIGNOP term[rhs] /* $x = $y, $x += $y */
{ $$ = newASSIGNOP(OPf_STACKED, $lhs, $ASSIGNOP, $rhs); }
| term[lhs] POWOP term[rhs] /* $x ** $y */
{ $$ = newBINOP($POWOP, 0, scalar($lhs), scalar($rhs)); }
| term[lhs] MULOP term[rhs] /* $x * $y, $x x $y */
{ if ($MULOP != OP_REPEAT)
scalar($lhs);
$$ = newBINOP($MULOP, 0, $lhs, scalar($rhs));
}
| term[lhs] ADDOP term[rhs] /* $x + $y */
{ $$ = newBINOP($ADDOP, 0, scalar($lhs), scalar($rhs)); }
| term[lhs] SHIFTOP term[rhs] /* $x >> $y, $x << $y */
{ $$ = newBINOP($SHIFTOP, 0, scalar($lhs), scalar($rhs)); }
| termrelop %prec PREC_LOW /* $x > $y, etc. */
{ $$ = $termrelop; }
| termeqop %prec PREC_LOW /* $x == $y, $x cmp $y */
{ $$ = $termeqop; }
| term[lhs] BITANDOP term[rhs] /* $x & $y */
{ $$ = newBINOP($BITANDOP, 0, scalar($lhs), scalar($rhs)); }
| term[lhs] BITOROP term[rhs] /* $x | $y */
{ $$ = newBINOP($BITOROP, 0, scalar($lhs), scalar($rhs)); }
| term[lhs] DOTDOT term[rhs] /* $x..$y, $x...$y */
{ $$ = newRANGE($DOTDOT, scalar($lhs), scalar($rhs)); }
| term[lhs] ANDAND term[rhs] /* $x && $y */
{ $$ = newLOGOP(OP_AND, 0, $lhs, $rhs); }
| term[lhs] OROR term[rhs] /* $x || $y */
{ $$ = newLOGOP(OP_OR, 0, $lhs, $rhs); }
| term[lhs] DORDOR term[rhs] /* $x // $y */
{ $$ = newLOGOP(OP_DOR, 0, $lhs, $rhs); }
| term[lhs] MATCHOP term[rhs] /* $x =~ /$y/ */
{ $$ = bind_match($MATCHOP, $lhs, $rhs); }
;
termrelop: relopchain %prec PREC_LOW
{ $$ = cmpchain_finish($relopchain); }
| term[lhs] NCRELOP term[rhs]
{ $$ = newBINOP($NCRELOP, 0, scalar($lhs), scalar($rhs)); }
| termrelop NCRELOP
{ yyerror("syntax error"); YYERROR; }
| termrelop CHRELOP
{ yyerror("syntax error"); YYERROR; }
;
relopchain: term[lhs] CHRELOP term[rhs]
{ $$ = cmpchain_start($CHRELOP, $lhs, $rhs); }
| relopchain[lhs] CHRELOP term[rhs]
{ $$ = cmpchain_extend($CHRELOP, $lhs, $rhs); }
;
termeqop: eqopchain %prec PREC_LOW
{ $$ = cmpchain_finish($eqopchain); }
| term[lhs] NCEQOP term[rhs]
{ $$ = newBINOP($NCEQOP, 0, scalar($lhs), scalar($rhs)); }
| termeqop NCEQOP
{ yyerror("syntax error"); YYERROR; }
| termeqop CHEQOP
{ yyerror("syntax error"); YYERROR; }
;
eqopchain: term[lhs] CHEQOP term[rhs]
{ $$ = cmpchain_start($CHEQOP, $lhs, $rhs); }
| eqopchain[lhs] CHEQOP term[rhs]
{ $$ = cmpchain_extend($CHEQOP, $lhs, $rhs); }
;
/* Unary operators and terms */
termunop : PERLY_MINUS term %prec UMINUS /* -$x */
{ $$ = newUNOP(OP_NEGATE, 0, scalar($term)); }
| PERLY_PLUS term %prec UMINUS /* +$x */
{ $$ = $term; }
| PERLY_EXCLAMATION_MARK term /* !$x */
{ $$ = newUNOP(OP_NOT, 0, scalar($term)); }
| PERLY_TILDE term /* ~$x */
{ $$ = newUNOP($PERLY_TILDE, 0, scalar($term)); }
| term POSTINC /* $x++ */
{ $$ = newUNOP(OP_POSTINC, 0,
op_lvalue(scalar($term), OP_POSTINC)); }
| term POSTDEC /* $x-- */
{ $$ = newUNOP(OP_POSTDEC, 0,
op_lvalue(scalar($term), OP_POSTDEC));}
| term POSTJOIN /* implicit join after interpolated ->@ */
{ $$ = op_convert_list(OP_JOIN, 0,
op_append_elem(
OP_LIST,
newSVREF(scalar(
newSVOP(OP_CONST,0,
newSVpvs("\""))
)),
$term
));
}
| PREINC term /* ++$x */
{ $$ = newUNOP(OP_PREINC, 0,
op_lvalue(scalar($term), OP_PREINC)); }
| PREDEC term /* --$x */
{ $$ = newUNOP(OP_PREDEC, 0,
op_lvalue(scalar($term), OP_PREDEC)); }
;
/* Constructors for anonymous data */
anonymous
: PERLY_BRACKET_OPEN optexpr PERLY_BRACKET_CLOSE
{ $$ = newANONLIST($optexpr); }
| HASHBRACK optexpr PERLY_SEMICOLON PERLY_BRACE_CLOSE %prec PERLY_PAREN_OPEN /* { foo => "Bar" } */
{ $$ = newANONHASH($optexpr); }
| ANONSUB startanonsub proto subattrlist subbody %prec PERLY_PAREN_OPEN
{ SvREFCNT_inc_simple_void(PL_compcv);
$$ = newANONATTRSUB($startanonsub, $proto, $subattrlist, $subbody); }
| ANON_SIGSUB startanonsub subattrlist sigsubbody %prec PERLY_PAREN_OPEN
{ SvREFCNT_inc_simple_void(PL_compcv);
$$ = newANONATTRSUB($startanonsub, NULL, $subattrlist, $sigsubbody); }
;
/* Things called with "do" */
termdo : DO term %prec UNIOP /* do $filename */
{ $$ = dofile($term, $DO);}
| DO block %prec PERLY_PAREN_OPEN /* do { code */
{ $$ = newUNOP(OP_NULL, OPf_SPECIAL, op_scope($block));}
;
term[product] : termbinop
| termunop
| anonymous
| termdo
| term[condition] PERLY_QUESTION_MARK term[then] PERLY_COLON term[else]
{ $$ = newCONDOP(0, $condition, $then, $else); }
| REFGEN term[operand] /* \$x, \@y, \%z */
{ $$ = newUNOP(OP_REFGEN, 0, $operand); }
| myattrterm %prec UNIOP
{ $$ = $myattrterm; }
| LOCAL term[operand] %prec UNIOP
{ $$ = localize($operand,0); }
| PERLY_PAREN_OPEN expr PERLY_PAREN_CLOSE
{ $$ = sawparens($expr); }
| QWLIST
{ $$ = $QWLIST; }
| PERLY_PAREN_OPEN PERLY_PAREN_CLOSE
{ $$ = sawparens(newNULLLIST()); }
| scalar %prec PERLY_PAREN_OPEN
{ $$ = $scalar; }
| star %prec PERLY_PAREN_OPEN
{ $$ = $star; }
| hsh %prec PERLY_PAREN_OPEN
{ $$ = $hsh; }
| ary %prec PERLY_PAREN_OPEN
{ $$ = $ary; }
| arylen %prec PERLY_PAREN_OPEN /* $#x, $#{ something } */
{ $$ = newUNOP(OP_AV2ARYLEN, 0, ref($arylen, OP_AV2ARYLEN));}
| subscripted
{ $$ = $subscripted; }
| sliceme PERLY_BRACKET_OPEN expr PERLY_BRACKET_CLOSE /* array slice */
{ $$ = op_prepend_elem(OP_ASLICE,
newOP(OP_PUSHMARK, 0),
newLISTOP(OP_ASLICE, 0,
list($expr),
ref($sliceme, OP_ASLICE)));
if ($$ && $sliceme)
$$->op_private |=
$sliceme->op_private & OPpSLICEWARNING;
}
| kvslice PERLY_BRACKET_OPEN expr PERLY_BRACKET_CLOSE /* array key/value slice */
{ $$ = op_prepend_elem(OP_KVASLICE,
newOP(OP_PUSHMARK, 0),
newLISTOP(OP_KVASLICE, 0,
list($expr),
ref(oopsAV($kvslice), OP_KVASLICE)));
if ($$ && $kvslice)
$$->op_private |=
$kvslice->op_private & OPpSLICEWARNING;
}
| sliceme PERLY_BRACE_OPEN expr PERLY_SEMICOLON PERLY_BRACE_CLOSE /* @hash{@keys} */
{ $$ = op_prepend_elem(OP_HSLICE,
newOP(OP_PUSHMARK, 0),
newLISTOP(OP_HSLICE, 0,
list($expr),
ref(oopsHV($sliceme), OP_HSLICE)));
if ($$ && $sliceme)
$$->op_private |=
$sliceme->op_private & OPpSLICEWARNING;
}
| kvslice PERLY_BRACE_OPEN expr PERLY_SEMICOLON PERLY_BRACE_CLOSE /* %hash{@keys} */
{ $$ = op_prepend_elem(OP_KVHSLICE,
newOP(OP_PUSHMARK, 0),
newLISTOP(OP_KVHSLICE, 0,
list($expr),
ref($kvslice, OP_KVHSLICE)));
if ($$ && $kvslice)
$$->op_private |=
$kvslice->op_private & OPpSLICEWARNING;
}
| THING %prec PERLY_PAREN_OPEN
{ $$ = $THING; }
| amper /* &foo; */
{ $$ = newUNOP(OP_ENTERSUB, 0, scalar($amper)); }
| amper PERLY_PAREN_OPEN PERLY_PAREN_CLOSE /* &foo() or foo() */
{ $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, scalar($amper));
}
| amper PERLY_PAREN_OPEN expr PERLY_PAREN_CLOSE /* &foo(@args) or foo(@args) */
{
$$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
op_append_elem(OP_LIST, $expr, scalar($amper)));
}
| NOAMP subname optlistexpr /* foo @args (no parens) */
{ $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
op_append_elem(OP_LIST, $optlistexpr, scalar($subname)));
}
| term[operand] ARROW PERLY_DOLLAR PERLY_STAR
{ $$ = newSVREF($operand); }
| term[operand] ARROW PERLY_SNAIL PERLY_STAR
{ $$ = newAVREF($operand); }
| term[operand] ARROW PERLY_PERCENT_SIGN PERLY_STAR
{ $$ = newHVREF($operand); }
| term[operand] ARROW PERLY_AMPERSAND PERLY_STAR
{ $$ = newUNOP(OP_ENTERSUB, 0,
scalar(newCVREF($PERLY_AMPERSAND,$operand))); }
| term[operand] ARROW PERLY_STAR PERLY_STAR %prec PERLY_PAREN_OPEN
{ $$ = newGVREF(0,$operand); }
| LOOPEX /* loop exiting command (goto, last, dump, etc) */
{ $$ = newOP($LOOPEX, OPf_SPECIAL);
PL_hints |= HINT_BLOCK_SCOPE; }
| LOOPEX term[operand]
{ $$ = newLOOPEX($LOOPEX,$operand); }
| NOTOP listexpr /* not $foo */
{ $$ = newUNOP(OP_NOT, 0, scalar($listexpr)); }
| UNIOP /* Unary op, $_ implied */
{ $$ = newOP($UNIOP, 0); }
| UNIOP block /* eval { foo }* */
{ $$ = newUNOP($UNIOP, 0, $block); }
| UNIOP term[operand] /* Unary op */
{ $$ = newUNOP($UNIOP, 0, $operand); }
| REQUIRE /* require, $_ implied */
{ $$ = newOP(OP_REQUIRE, $REQUIRE ? OPf_SPECIAL : 0); }
| REQUIRE term[operand] /* require Foo */
{ $$ = newUNOP(OP_REQUIRE, $REQUIRE ? OPf_SPECIAL : 0, $operand); }
| UNIOPSUB
{ $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, scalar($UNIOPSUB)); }
| UNIOPSUB term[operand] /* Sub treated as unop */
{ $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
op_append_elem(OP_LIST, $operand, scalar($UNIOPSUB))); }
| FUNC0 /* Nullary operator */
{ $$ = newOP($FUNC0, 0); }
| FUNC0 PERLY_PAREN_OPEN PERLY_PAREN_CLOSE
{ $$ = newOP($FUNC0, 0);}
| FUNC0OP /* Same as above, but op created in toke.c */
{ $$ = $FUNC0OP; }
| FUNC0OP PERLY_PAREN_OPEN PERLY_PAREN_CLOSE
{ $$ = $FUNC0OP; }
| FUNC0SUB /* Sub treated as nullop */
{ $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, scalar($FUNC0SUB)); }
| FUNC1 PERLY_PAREN_OPEN PERLY_PAREN_CLOSE /* not () */
{ $$ = ($FUNC1 == OP_NOT)
? newUNOP($FUNC1, 0, newSVOP(OP_CONST, 0, newSViv(0)))
: newOP($FUNC1, OPf_SPECIAL); }
| FUNC1 PERLY_PAREN_OPEN expr PERLY_PAREN_CLOSE /* not($foo) */
{ $$ = newUNOP($FUNC1, 0, $expr); }
| PMFUNC /* m//, s///, qr//, tr/// */
{
if ( $PMFUNC->op_type != OP_TRANS
&& $PMFUNC->op_type != OP_TRANSR
&& (((PMOP*)$PMFUNC)->op_pmflags & PMf_HAS_CV))
{
$<ival>$ = start_subparse(FALSE, CVf_ANON);
SAVEFREESV(PL_compcv);
} else
$<ival>$ = 0;
}
SUBLEXSTART listexpr optrepl SUBLEXEND
{ $$ = pmruntime($PMFUNC, $listexpr, $optrepl, 1, $<ival>2); }
| BAREWORD
| listop
| PLUGEXPR
;
/* "my" declarations, with optional attributes */
myattrterm
: MY myterm myattrlist
{ $$ = my_attrs($myterm,$myattrlist); }
| MY myterm
{ $$ = localize($myterm,1); }
| MY REFGEN myterm myattrlist
{ $$ = newUNOP(OP_REFGEN, 0, my_attrs($myterm,$myattrlist)); }
| MY REFGEN term[operand]
{ $$ = newUNOP(OP_REFGEN, 0, localize($operand,1)); }
;
/* Things that can be "my"'d */
myterm : PERLY_PAREN_OPEN expr PERLY_PAREN_CLOSE
{ $$ = sawparens($expr); }
| PERLY_PAREN_OPEN PERLY_PAREN_CLOSE
{ $$ = sawparens(newNULLLIST()); }
| scalar %prec PERLY_PAREN_OPEN
{ $$ = $scalar; }
| hsh %prec PERLY_PAREN_OPEN
{ $$ = $hsh; }
| ary %prec PERLY_PAREN_OPEN
{ $$ = $ary; }
;
/* Basic list expressions */
optlistexpr
: empty %prec PREC_LOW
| listexpr %prec PREC_LOW
;
optexpr
: empty
| expr
;
optrepl
: empty
| PERLY_SLASH expr { $$ = $expr; }
;
/* A little bit of trickery to make "for my $foo (@bar)" actually be
lexical */
my_scalar: scalar
{ parser->in_my = 0; $$ = my($scalar); }
;
/* A list of scalars for "for my ($foo, $bar) (@baz)" */
list_of_scalars: list_of_scalars[list] PERLY_COMMA
{ $$ = $list; }
| list_of_scalars[list] PERLY_COMMA scalar
{
$$ = op_append_elem(OP_LIST, $list, $scalar);
}
| scalar %prec PREC_LOW
;
my_list_of_scalars: list_of_scalars
{ parser->in_my = 0; $$ = $list_of_scalars; }
;
my_var : scalar
| ary
| hsh
;
refgen_topic: my_var
| amper
;
my_refgen: MY REFGEN
| REFGEN MY
;
amper : PERLY_AMPERSAND indirob
{ $$ = newCVREF($PERLY_AMPERSAND,$indirob); }
;
scalar : PERLY_DOLLAR indirob
{ $$ = newSVREF($indirob); }
;
ary : PERLY_SNAIL indirob
{ $$ = newAVREF($indirob);
if ($$) $$->op_private |= $PERLY_SNAIL;
}
;
hsh : PERLY_PERCENT_SIGN indirob
{ $$ = newHVREF($indirob);
if ($$) $$->op_private |= $PERLY_PERCENT_SIGN;
}
;
arylen : DOLSHARP indirob
{ $$ = newAVREF($indirob); }
| term ARROW DOLSHARP PERLY_STAR
{ $$ = newAVREF($term); }
;
star : PERLY_STAR indirob
{ $$ = newGVREF(0,$indirob); }
;
sliceme : ary
| term ARROW PERLY_SNAIL
{ $$ = newAVREF($term); }
;
kvslice : hsh
| term ARROW PERLY_PERCENT_SIGN
{ $$ = newHVREF($term); }
;
gelem : star
| term ARROW PERLY_STAR
{ $$ = newGVREF(0,$term); }
;
/* Indirect objects */
indirob : BAREWORD
{ $$ = scalar($BAREWORD); }
| scalar %prec PREC_LOW
{ $$ = scalar($scalar); }
| block
{ $$ = op_scope($block); }
| PRIVATEREF
{ $$ = $PRIVATEREF; }
;
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