forked from schacon/perl
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perly.y
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perly.y
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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.
*
* Note that these derived files are included and compiled twice; once
* from perly.c, and once from madly.c. The second time, a number of MAD
* macros are defined, which compile in extra code that allows the parse
* tree to be accurately dumped. In particular:
*
* MAD defined if compiling madly.c
* DO_MAD(A) expands to A under madly.c, to null otherwise
* IF_MAD(a,b) expands to A under madly.c, to B otherwise
* TOKEN_GETMAD() expands to token_getmad() under madly.c, to null otherwise
* TOKEN_FREE() similarly
* OP_GETMAD() similarly
* IVAL(i) expands to (i)->tk_lval.ival or (i)
* PVAL(p) expands to (p)->tk_lval.pval or (p)
*
* The main job of 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 $n variables within
* an action.
*/
/* Make the parser re-entrant. */
%pure_parser
/* FIXME for MAD - is the new mintro on while and until important? */
%start grammar
%union {
I32 ival; /* __DEFAULT__ (marker for regen_perly.pl;
must always be 1st union member) */
char *pval;
OP *opval;
GV *gvval;
#ifdef PERL_IN_MADLY_C
TOKEN* p_tkval;
TOKEN* i_tkval;
#else
char *p_tkval;
I32 i_tkval;
#endif
#ifdef PERL_MAD
TOKEN* tkval;
#endif
}
%token <ival> GRAMPROG GRAMEXPR GRAMBLOCK GRAMBARESTMT GRAMFULLSTMT GRAMSTMTSEQ
%token <i_tkval> '{' '}' '[' ']' '-' '+' '$' '@' '%' '*' '&' ';' '=' '.'
%token <opval> WORD METHOD FUNCMETH THING PMFUNC PRIVATEREF QWLIST
%token <opval> FUNC0OP FUNC0SUB UNIOPSUB LSTOPSUB
%token <opval> PLUGEXPR PLUGSTMT
%token <p_tkval> LABEL
%token <i_tkval> FORMAT SUB ANONSUB PACKAGE USE
%token <i_tkval> WHILE UNTIL IF UNLESS ELSE ELSIF CONTINUE FOR
%token <i_tkval> GIVEN WHEN DEFAULT
%token <i_tkval> LOOPEX DOTDOT YADAYADA
%token <i_tkval> FUNC0 FUNC1 FUNC UNIOP LSTOP
%token <i_tkval> RELOP EQOP MULOP ADDOP
%token <i_tkval> DOLSHARP DO HASHBRACK NOAMP
%token <i_tkval> LOCAL MY REQUIRE
%token <i_tkval> COLONATTR FORMLBRACK FORMRBRACK
%type <ival> grammar remember mremember
%type <ival> startsub startanonsub startformsub
/* FIXME for MAD - are these two ival? */
%type <ival> mintro
%type <opval> stmtseq fullstmt labfullstmt barestmt block mblock else
%type <opval> expr term subscripted scalar ary hsh arylen star amper sideff
%type <opval> sliceme kvslice gelem
%type <opval> listexpr nexpr texpr iexpr mexpr mnexpr miexpr
%type <opval> optlistexpr optexpr indirob listop method
%type <opval> formname subname proto subbody cont my_scalar formblock
%type <opval> subattrlist myattrlist myattrterm myterm
%type <opval> termbinop termunop anonymous termdo
%type <opval> formstmtseq formline formarg
%nonassoc <i_tkval> PREC_LOW
%nonassoc LOOPEX
%left <i_tkval> OROP DOROP
%left <i_tkval> ANDOP
%right <i_tkval> NOTOP
%nonassoc LSTOP LSTOPSUB
%left <i_tkval> ','
%right <i_tkval> ASSIGNOP
%right <i_tkval> '?' ':'
%nonassoc DOTDOT YADAYADA
%left <i_tkval> OROR DORDOR
%left <i_tkval> ANDAND
%left <i_tkval> BITOROP
%left <i_tkval> BITANDOP
%nonassoc EQOP
%nonassoc RELOP
%nonassoc UNIOP UNIOPSUB
%nonassoc REQUIRE
%left <i_tkval> SHIFTOP
%left ADDOP
%left MULOP
%left <i_tkval> MATCHOP
%right <i_tkval> '!' '~' UMINUS REFGEN
%right <i_tkval> POWOP
%nonassoc <i_tkval> PREINC PREDEC POSTINC POSTDEC POSTJOIN
%left <i_tkval> ARROW
%nonassoc <i_tkval> ')'
%left <i_tkval> '('
%left '[' '{'
%token <i_tkval> PEG
%% /* RULES */
/* Top-level choice of what kind of thing yyparse was called to parse */
grammar : GRAMPROG
{
PL_parser->expect = XSTATE;
}
remember stmtseq
{
newPROG(block_end($3,$4));
$$ = 0;
}
| GRAMEXPR
{
parser->expect = XTERM;
}
optexpr
{
PL_eval_root = $3;
$$ = 0;
}
| GRAMBLOCK
{
parser->expect = XBLOCK;
}
block
{
PL_pad_reset_pending = TRUE;
PL_eval_root = $3;
$$ = 0;
yyunlex();
parser->yychar = YYEOF;
}
| GRAMBARESTMT
{
parser->expect = XSTATE;
}
barestmt
{
PL_pad_reset_pending = TRUE;
PL_eval_root = $3;
$$ = 0;
yyunlex();
parser->yychar = YYEOF;
}
| GRAMFULLSTMT
{
parser->expect = XSTATE;
}
fullstmt
{
PL_pad_reset_pending = TRUE;
PL_eval_root = $3;
$$ = 0;
yyunlex();
parser->yychar = YYEOF;
}
| GRAMSTMTSEQ
{
parser->expect = XSTATE;
}
stmtseq
{
PL_eval_root = $3;
$$ = 0;
}
;
/* An ordinary block */
block : '{' remember stmtseq '}'
{ if (PL_parser->copline > (line_t)IVAL($1))
PL_parser->copline = (line_t)IVAL($1);
$$ = block_end($2, $3);
TOKEN_GETMAD($1,$$,'{');
TOKEN_GETMAD($4,$$,'}');
}
;
/* format body */
formblock: '=' remember ';' FORMRBRACK formstmtseq ';' '.'
{ if (PL_parser->copline > (line_t)IVAL($1))
PL_parser->copline = (line_t)IVAL($1);
$$ = block_end($2, $5);
TOKEN_GETMAD($1,$$,'{');
TOKEN_GETMAD($7,$$,'}');
}
;
remember: /* NULL */ /* start a full lexical scope */
{ $$ = block_start(TRUE); }
;
mblock : '{' mremember stmtseq '}'
{ if (PL_parser->copline > (line_t)IVAL($1))
PL_parser->copline = (line_t)IVAL($1);
$$ = block_end($2, $3);
TOKEN_GETMAD($1,$$,'{');
TOKEN_GETMAD($4,$$,'}');
}
;
mremember: /* NULL */ /* start a partial lexical scope */
{ $$ = block_start(FALSE); }
;
/* A sequence of statements in the program */
stmtseq : /* NULL */
{ $$ = (OP*)NULL; }
| stmtseq fullstmt
{ $$ = op_append_list(OP_LINESEQ, $1, $2);
PL_pad_reset_pending = TRUE;
if ($1 && $2)
PL_hints |= HINT_BLOCK_SCOPE;
}
;
/* A sequence of format lines */
formstmtseq: /* NULL */
{ $$ = (OP*)NULL; }
| formstmtseq formline
{ $$ = op_append_list(OP_LINESEQ, $1, $2);
PL_pad_reset_pending = TRUE;
if ($1 && $2)
PL_hints |= HINT_BLOCK_SCOPE;
}
;
/* A statement in the program, including optional labels */
fullstmt: barestmt
{
if($1) {
$$ = newSTATEOP(0, NULL, $1);
} else {
$$ = IF_MAD(newOP(OP_NULL, 0), NULL);
}
}
| labfullstmt
{ $$ = $1; }
;
labfullstmt: LABEL barestmt
{
$$ = newSTATEOP(SVf_UTF8
* PVAL($1)[strlen(PVAL($1))+1],
PVAL($1), $2);
TOKEN_GETMAD($1,
$2 ? cLISTOPx($$)->op_first : $$, 'L');
}
| LABEL labfullstmt
{
$$ = newSTATEOP(SVf_UTF8
* PVAL($1)[strlen(PVAL($1))+1],
PVAL($1), $2);
TOKEN_GETMAD($1, cLISTOPx($$)->op_first, 'L');
}
;
/* A bare statement, lacking label and other aspects of state op */
barestmt: PLUGSTMT
{ $$ = $1; }
| PEG
{
$$ = newOP(OP_NULL,0);
TOKEN_GETMAD($1,$$,'p');
}
| FORMAT startformsub formname formblock
{
CV *fmtcv = PL_compcv;
#ifdef MAD
$$ = newFORM($2, $3, $4);
prepend_madprops($1->tk_mad, $$, 'F');
$1->tk_mad = 0;
token_free($1);
#else
newFORM($2, $3, $4);
$$ = (OP*)NULL;
#endif
if (CvOUTSIDE(fmtcv) && !CvEVAL(CvOUTSIDE(fmtcv))) {
SvREFCNT_inc_simple_void(fmtcv);
pad_add_anon(fmtcv, OP_NULL);
}
}
| SUB subname startsub
{
if ($2->op_type == OP_CONST) {
const char *const name =
SvPV_nolen_const(((SVOP*)$2)->op_sv);
if (strEQ(name, "BEGIN") || strEQ(name, "END")
|| strEQ(name, "INIT") || strEQ(name, "CHECK")
|| strEQ(name, "UNITCHECK"))
CvSPECIAL_on(PL_compcv);
}
else
/* State subs inside anonymous subs need to be
clonable themselves. */
if (CvANON(CvOUTSIDE(PL_compcv))
|| CvCLONE(CvOUTSIDE(PL_compcv))
|| !PadnameIsSTATE(PadlistNAMESARRAY(CvPADLIST(
CvOUTSIDE(PL_compcv)
))[$2->op_targ]))
CvCLONE_on(PL_compcv);
PL_parser->in_my = 0;
PL_parser->in_my_stash = NULL;
}
proto subattrlist subbody
{
SvREFCNT_inc_simple_void(PL_compcv);
#ifdef MAD
{
OP* o = newSVOP(OP_ANONCODE, 0,
(SV*)(
#endif
$2->op_type == OP_CONST
? newATTRSUB($3, $2, $5, $6, $7)
: newMYSUB($3, $2, $5, $6, $7)
#ifdef MAD
));
$$ = newOP(OP_NULL,0);
op_getmad(o,$$,'&');
op_getmad($2,$$,'n');
op_getmad($5,$$,'s');
op_getmad($6,$$,'a');
token_getmad($1,$$,'d');
append_madprops($7->op_madprop, $$, 0);
$7->op_madprop = 0;
}
#else
;
$$ = (OP*)NULL;
#endif
intro_my();
}
| PACKAGE WORD WORD ';'
{
#ifdef MAD
$$ = package($3);
token_getmad($1,$$,'o');
if ($2)
package_version($2);
token_getmad($4,$$,';');
#else
package($3);
if ($2)
package_version($2);
$$ = (OP*)NULL;
#endif
}
| USE startsub
{ CvSPECIAL_on(PL_compcv); /* It's a BEGIN {} */ }
WORD WORD optlistexpr ';'
{
SvREFCNT_inc_simple_void(PL_compcv);
#ifdef MAD
$$ = utilize(IVAL($1), $2, $4, $5, $6);
token_getmad($1,$$,'o');
token_getmad($7,$$,';');
if (PL_parser->rsfp_filters &&
AvFILLp(PL_parser->rsfp_filters) >= 0)
append_madprops(newMADPROP('!', MAD_NULL, NULL, 0), $$, 0);
#else
utilize(IVAL($1), $2, $4, $5, $6);
$$ = (OP*)NULL;
#endif
}
| IF '(' remember mexpr ')' mblock else
{
$$ = block_end($3,
newCONDOP(0, $4, op_scope($6), $7));
TOKEN_GETMAD($1,$$,'I');
TOKEN_GETMAD($2,$$,'(');
TOKEN_GETMAD($5,$$,')');
PL_parser->copline = (line_t)IVAL($1);
}
| UNLESS '(' remember miexpr ')' mblock else
{
$$ = block_end($3,
newCONDOP(0, $4, op_scope($6), $7));
TOKEN_GETMAD($1,$$,'I');
TOKEN_GETMAD($2,$$,'(');
TOKEN_GETMAD($5,$$,')');
PL_parser->copline = (line_t)IVAL($1);
}
| GIVEN '(' remember mexpr ')' mblock
{
const PADOFFSET offset = pad_findmy_pvs("$_", 0);
$$ = block_end($3,
newGIVENOP($4, op_scope($6),
offset == NOT_IN_PAD
|| PAD_COMPNAME_FLAGS_isOUR(offset)
? 0
: offset));
PL_parser->copline = (line_t)IVAL($1);
}
| WHEN '(' remember mexpr ')' mblock
{ $$ = block_end($3, newWHENOP($4, op_scope($6))); }
| DEFAULT block
{ $$ = newWHENOP(0, op_scope($2)); }
| WHILE '(' remember texpr ')' mintro mblock cont
{
$$ = block_end($3,
newWHILEOP(0, 1, (LOOP*)(OP*)NULL,
$4, $7, $8, $6));
TOKEN_GETMAD($1,$$,'W');
TOKEN_GETMAD($2,$$,'(');
TOKEN_GETMAD($5,$$,')');
PL_parser->copline = (line_t)IVAL($1);
}
| UNTIL '(' remember iexpr ')' mintro mblock cont
{
$$ = block_end($3,
newWHILEOP(0, 1, (LOOP*)(OP*)NULL,
$4, $7, $8, $6));
TOKEN_GETMAD($1,$$,'W');
TOKEN_GETMAD($2,$$,'(');
TOKEN_GETMAD($5,$$,')');
PL_parser->copline = (line_t)IVAL($1);
}
| FOR '(' remember mnexpr ';' texpr ';' mintro mnexpr ')'
mblock
{
OP *initop = IF_MAD($4 ? $4 : newOP(OP_NULL, 0), $4);
OP *forop = newWHILEOP(0, 1, (LOOP*)(OP*)NULL,
scalar($6), $11, $9, $8);
if (initop) {
forop = op_prepend_elem(OP_LINESEQ, initop,
op_append_elem(OP_LINESEQ,
newOP(OP_UNSTACK, OPf_SPECIAL),
forop));
}
DO_MAD({ forop = newUNOP(OP_NULL, 0, forop); })
$$ = block_end($3, forop);
TOKEN_GETMAD($1,$$,'3');
TOKEN_GETMAD($2,$$,'(');
TOKEN_GETMAD($5,$$,'1');
TOKEN_GETMAD($7,$$,'2');
TOKEN_GETMAD($10,$$,')');
PL_parser->copline = (line_t)IVAL($1);
}
| FOR MY remember my_scalar '(' mexpr ')' mblock cont
{
$$ = block_end($3, newFOROP(0, $4, $6, $8, $9));
TOKEN_GETMAD($1,$$,'W');
TOKEN_GETMAD($2,$$,'d');
TOKEN_GETMAD($5,$$,'(');
TOKEN_GETMAD($7,$$,')');
PL_parser->copline = (line_t)IVAL($1);
}
| FOR scalar '(' remember mexpr ')' mblock cont
{
$$ = block_end($4, newFOROP(0,
op_lvalue($2, OP_ENTERLOOP), $5, $7, $8));
TOKEN_GETMAD($1,$$,'W');
TOKEN_GETMAD($3,$$,'(');
TOKEN_GETMAD($6,$$,')');
PL_parser->copline = (line_t)IVAL($1);
}
| FOR '(' remember mexpr ')' mblock cont
{
$$ = block_end($3,
newFOROP(0, (OP*)NULL, $4, $6, $7));
TOKEN_GETMAD($1,$$,'W');
TOKEN_GETMAD($2,$$,'(');
TOKEN_GETMAD($5,$$,')');
PL_parser->copline = (line_t)IVAL($1);
}
| block cont
{
/* a block is a loop that happens once */
$$ = newWHILEOP(0, 1, (LOOP*)(OP*)NULL,
(OP*)NULL, $1, $2, 0);
}
| PACKAGE WORD WORD '{' remember
{
package($3);
if ($2) {
package_version($2);
}
}
stmtseq '}'
{
/* a block is a loop that happens once */
$$ = newWHILEOP(0, 1, (LOOP*)(OP*)NULL,
(OP*)NULL, block_end($5, $7), (OP*)NULL, 0);
TOKEN_GETMAD($4,$$,'{');
TOKEN_GETMAD($8,$$,'}');
if (PL_parser->copline > (line_t)IVAL($4))
PL_parser->copline = (line_t)IVAL($4);
}
| sideff ';'
{
PL_parser->expect = XSTATE;
$$ = $1;
TOKEN_GETMAD($2,$$,';');
}
| ';'
{
PL_parser->expect = XSTATE;
$$ = IF_MAD(newOP(OP_NULL, 0), (OP*)NULL);
TOKEN_GETMAD($1,$$,';');
PL_parser->copline = NOLINE;
}
;
/* Format line */
formline: THING formarg
{ OP *list;
if ($2) {
OP *term = $2;
DO_MAD(term = newUNOP(OP_NULL, 0, term));
list = op_append_elem(OP_LIST, $1, term);
}
else {
#ifdef MAD
OP *op = newNULLLIST();
list = op_append_elem(OP_LIST, $1, op);
#else
list = $1;
#endif
}
if (PL_parser->copline == NOLINE)
PL_parser->copline = CopLINE(PL_curcop)-1;
else PL_parser->copline--;
$$ = newSTATEOP(0, NULL,
convert(OP_FORMLINE, 0, list));
}
;
formarg : /* NULL */
{ $$ = NULL; }
| FORMLBRACK stmtseq FORMRBRACK
{ $$ = op_unscope($2); }
;
/* An expression which may have a side-effect */
sideff : error
{ $$ = (OP*)NULL; }
| expr
{ $$ = $1; }
| expr IF expr
{ $$ = newLOGOP(OP_AND, 0, $3, $1);
TOKEN_GETMAD($2,$$,'i');
}
| expr UNLESS expr
{ $$ = newLOGOP(OP_OR, 0, $3, $1);
TOKEN_GETMAD($2,$$,'i');
}
| expr WHILE expr
{ $$ = newLOOPOP(OPf_PARENS, 1, scalar($3), $1);
TOKEN_GETMAD($2,$$,'w');
}
| expr UNTIL iexpr
{ $$ = newLOOPOP(OPf_PARENS, 1, $3, $1);
TOKEN_GETMAD($2,$$,'w');
}
| expr FOR expr
{ $$ = newFOROP(0, (OP*)NULL, $3, $1, (OP*)NULL);
TOKEN_GETMAD($2,$$,'w');
PL_parser->copline = (line_t)IVAL($2);
}
| expr WHEN expr
{ $$ = newWHENOP($3, op_scope($1)); }
;
/* else and elsif blocks */
else : /* NULL */
{ $$ = (OP*)NULL; }
| ELSE mblock
{
($2)->op_flags |= OPf_PARENS;
$$ = op_scope($2);
TOKEN_GETMAD($1,$$,'o');
}
| ELSIF '(' mexpr ')' mblock else
{ PL_parser->copline = (line_t)IVAL($1);
$$ = newCONDOP(0,
newSTATEOP(OPf_SPECIAL,NULL,$3),
op_scope($5), $6);
PL_hints |= HINT_BLOCK_SCOPE;
TOKEN_GETMAD($1,$$,'I');
TOKEN_GETMAD($2,$$,'(');
TOKEN_GETMAD($4,$$,')');
}
;
/* Continue blocks */
cont : /* NULL */
{ $$ = (OP*)NULL; }
| CONTINUE block
{
$$ = op_scope($2);
TOKEN_GETMAD($1,$$,'o');
}
;
/* determine whether there are any new my declarations */
mintro : /* NULL */
{ $$ = (PL_min_intro_pending &&
PL_max_intro_pending >= PL_min_intro_pending);
intro_my(); }
/* Normal expression */
nexpr : /* NULL */
{ $$ = (OP*)NULL; }
| sideff
;
/* Boolean expression */
texpr : /* NULL means true */
{ YYSTYPE tmplval;
(void)scan_num("1", &tmplval);
$$ = tmplval.opval; }
| expr
;
/* Inverted boolean expression */
iexpr : expr
{ $$ = invert(scalar($1)); }
;
/* Expression with its own lexical scope */
mexpr : expr
{ $$ = $1; intro_my(); }
;
mnexpr : nexpr
{ $$ = $1; intro_my(); }
;
miexpr : iexpr
{ $$ = $1; intro_my(); }
;
formname: WORD { $$ = $1; }
| /* NULL */ { $$ = (OP*)NULL; }
;
startsub: /* NULL */ /* start a regular subroutine scope */
{ $$ = start_subparse(FALSE, 0);
SAVEFREESV(PL_compcv); }
;
startanonsub: /* NULL */ /* start an anonymous subroutine scope */
{ $$ = start_subparse(FALSE, CVf_ANON);
SAVEFREESV(PL_compcv); }
;
startformsub: /* NULL */ /* start a format subroutine scope */
{ $$ = start_subparse(TRUE, 0);
SAVEFREESV(PL_compcv); }
;
/* Name of a subroutine - must be a bareword, could be special */
subname : WORD
| PRIVATEREF
;
/* Subroutine prototype */
proto : /* NULL */
{ $$ = (OP*)NULL; }
| THING
;
/* Optional list of subroutine attributes */
subattrlist: /* NULL */
{ $$ = (OP*)NULL; }
| COLONATTR THING
{ $$ = $2;
TOKEN_GETMAD($1,$$,':');
}
| COLONATTR
{ $$ = IF_MAD(
newOP(OP_NULL, 0),
(OP*)NULL
);
TOKEN_GETMAD($1,$$,':');
}
;
/* List of attributes for a "my" variable declaration */
myattrlist: COLONATTR THING
{ $$ = $2;
TOKEN_GETMAD($1,$$,':');
}
| COLONATTR
{ $$ = IF_MAD(
newOP(OP_NULL, 0),
(OP*)NULL
);
TOKEN_GETMAD($1,$$,':');
}
;
/* Subroutine body - either null or a block */
subbody : block { $$ = $1; }
| ';' { $$ = IF_MAD(
newOP(OP_NULL,0),
(OP*)NULL
);
PL_parser->expect = XSTATE;
TOKEN_GETMAD($1,$$,';');
}
;
/* Ordinary expressions; logical combinations */
expr : expr ANDOP expr
{ $$ = newLOGOP(OP_AND, 0, $1, $3);
TOKEN_GETMAD($2,$$,'o');
}
| expr OROP expr
{ $$ = newLOGOP(IVAL($2), 0, $1, $3);
TOKEN_GETMAD($2,$$,'o');
}
| expr DOROP expr
{ $$ = newLOGOP(OP_DOR, 0, $1, $3);
TOKEN_GETMAD($2,$$,'o');
}
| listexpr %prec PREC_LOW
;
/* Expressions are a list of terms joined by commas */
listexpr: listexpr ','
{
#ifdef MAD
OP* op = newNULLLIST();
token_getmad($2,op,',');
$$ = op_append_elem(OP_LIST, $1, op);
#else
$$ = $1;
#endif
}
| listexpr ',' term
{
OP* term = $3;
DO_MAD(
term = newUNOP(OP_NULL, 0, term);
token_getmad($2,term,',');
)
$$ = op_append_elem(OP_LIST, $1, term);
}
| term %prec PREC_LOW
;
/* List operators */
listop : LSTOP indirob listexpr /* map {...} @args or print $fh @args */
{ $$ = convert(IVAL($1), OPf_STACKED,
op_prepend_elem(OP_LIST, newGVREF(IVAL($1),$2), $3) );
TOKEN_GETMAD($1,$$,'o');
}
| FUNC '(' indirob expr ')' /* print ($fh @args */
{ $$ = convert(IVAL($1), OPf_STACKED,
op_prepend_elem(OP_LIST, newGVREF(IVAL($1),$3), $4) );
TOKEN_GETMAD($1,$$,'o');
TOKEN_GETMAD($2,$$,'(');
TOKEN_GETMAD($5,$$,')');
}
| term ARROW method '(' optexpr ')' /* $foo->bar(list) */
{ $$ = convert(OP_ENTERSUB, OPf_STACKED,
op_append_elem(OP_LIST,
op_prepend_elem(OP_LIST, scalar($1), $5),
newUNOP(OP_METHOD, 0, $3)));
TOKEN_GETMAD($2,$$,'A');
TOKEN_GETMAD($4,$$,'(');
TOKEN_GETMAD($6,$$,')');
}
| term ARROW method /* $foo->bar */
{ $$ = convert(OP_ENTERSUB, OPf_STACKED,
op_append_elem(OP_LIST, scalar($1),
newUNOP(OP_METHOD, 0, $3)));
TOKEN_GETMAD($2,$$,'A');
}
| METHOD indirob optlistexpr /* new Class @args */
{ $$ = convert(OP_ENTERSUB, OPf_STACKED,
op_append_elem(OP_LIST,
op_prepend_elem(OP_LIST, $2, $3),
newUNOP(OP_METHOD, 0, $1)));
}
| FUNCMETH indirob '(' optexpr ')' /* method $object (@args) */
{ $$ = convert(OP_ENTERSUB, OPf_STACKED,
op_append_elem(OP_LIST,
op_prepend_elem(OP_LIST, $2, $4),
newUNOP(OP_METHOD, 0, $1)));
TOKEN_GETMAD($3,$$,'(');
TOKEN_GETMAD($5,$$,')');
}
| LSTOP optlistexpr /* print @args */
{ $$ = convert(IVAL($1), 0, $2);
TOKEN_GETMAD($1,$$,'o');
}
| FUNC '(' optexpr ')' /* print (@args) */
{ $$ = convert(IVAL($1), 0, $3);
TOKEN_GETMAD($1,$$,'o');
TOKEN_GETMAD($2,$$,'(');
TOKEN_GETMAD($4,$$,')');
}
| LSTOPSUB startanonsub block /* sub f(&@); f { foo } ... */
{ SvREFCNT_inc_simple_void(PL_compcv);
$<opval>$ = newANONATTRSUB($2, 0, (OP*)NULL, $3); }
optlistexpr %prec LSTOP /* ... @bar */
{ $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
op_append_elem(OP_LIST,
op_prepend_elem(OP_LIST, $<opval>4, $5), $1));
}
;
/* Names of methods. May use $object->$methodname */
method : METHOD
| scalar
;
/* Some kind of subscripted expression */
subscripted: gelem '{' expr ';' '}' /* *main::{something} */
/* In this and all the hash accessors, ';' is
* provided by the tokeniser */
{ $$ = newBINOP(OP_GELEM, 0, $1, scalar($3));
PL_parser->expect = XOPERATOR;
TOKEN_GETMAD($2,$$,'{');
TOKEN_GETMAD($4,$$,';');
TOKEN_GETMAD($5,$$,'}');
}
| scalar '[' expr ']' /* $array[$element] */
{ $$ = newBINOP(OP_AELEM, 0, oopsAV($1), scalar($3));
TOKEN_GETMAD($2,$$,'[');
TOKEN_GETMAD($4,$$,']');
}
| term ARROW '[' expr ']' /* somearef->[$element] */
{ $$ = newBINOP(OP_AELEM, 0,
ref(newAVREF($1),OP_RV2AV),
scalar($4));
TOKEN_GETMAD($2,$$,'a');
TOKEN_GETMAD($3,$$,'[');
TOKEN_GETMAD($5,$$,']');
}
| subscripted '[' expr ']' /* $foo->[$bar]->[$baz] */
{ $$ = newBINOP(OP_AELEM, 0,
ref(newAVREF($1),OP_RV2AV),
scalar($3));
TOKEN_GETMAD($2,$$,'[');
TOKEN_GETMAD($4,$$,']');
}
| scalar '{' expr ';' '}' /* $foo{bar();} */
{ $$ = newBINOP(OP_HELEM, 0, oopsHV($1), jmaybe($3));
PL_parser->expect = XOPERATOR;
TOKEN_GETMAD($2,$$,'{');
TOKEN_GETMAD($4,$$,';');
TOKEN_GETMAD($5,$$,'}');
}
| term ARROW '{' expr ';' '}' /* somehref->{bar();} */
{ $$ = newBINOP(OP_HELEM, 0,
ref(newHVREF($1),OP_RV2HV),
jmaybe($4));
PL_parser->expect = XOPERATOR;
TOKEN_GETMAD($2,$$,'a');
TOKEN_GETMAD($3,$$,'{');
TOKEN_GETMAD($5,$$,';');
TOKEN_GETMAD($6,$$,'}');
}
| subscripted '{' expr ';' '}' /* $foo->[bar]->{baz;} */
{ $$ = newBINOP(OP_HELEM, 0,
ref(newHVREF($1),OP_RV2HV),
jmaybe($3));
PL_parser->expect = XOPERATOR;
TOKEN_GETMAD($2,$$,'{');
TOKEN_GETMAD($4,$$,';');
TOKEN_GETMAD($5,$$,'}');
}
| term ARROW '(' ')' /* $subref->() */
{ $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
newCVREF(0, scalar($1)));
TOKEN_GETMAD($2,$$,'a');
TOKEN_GETMAD($3,$$,'(');
TOKEN_GETMAD($4,$$,')');
}
| term ARROW '(' expr ')' /* $subref->(@args) */
{ $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
op_append_elem(OP_LIST, $4,
newCVREF(0, scalar($1))));
TOKEN_GETMAD($2,$$,'a');
TOKEN_GETMAD($3,$$,'(');
TOKEN_GETMAD($5,$$,')');
}
| subscripted '(' expr ')' /* $foo->{bar}->(@args) */
{ $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
op_append_elem(OP_LIST, $3,
newCVREF(0, scalar($1))));
TOKEN_GETMAD($2,$$,'(');
TOKEN_GETMAD($4,$$,')');
}
| subscripted '(' ')' /* $foo->{bar}->() */
{ $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
newCVREF(0, scalar($1)));
TOKEN_GETMAD($2,$$,'(');
TOKEN_GETMAD($3,$$,')');
}
| '(' expr ')' '[' expr ']' /* list slice */
{ $$ = newSLICEOP(0, $5, $2);
TOKEN_GETMAD($1,$$,'(');
TOKEN_GETMAD($3,$$,')');
TOKEN_GETMAD($4,$$,'[');
TOKEN_GETMAD($6,$$,']');
}
| QWLIST '[' expr ']' /* list literal slice */
{ $$ = newSLICEOP(0, $3, $1);
TOKEN_GETMAD($2,$$,'[');
TOKEN_GETMAD($4,$$,']');
}
| '(' ')' '[' expr ']' /* empty list slice! */
{ $$ = newSLICEOP(0, $4, (OP*)NULL);
TOKEN_GETMAD($1,$$,'(');
TOKEN_GETMAD($2,$$,')');
TOKEN_GETMAD($3,$$,'[');
TOKEN_GETMAD($5,$$,']');
}
;
/* Binary operators between terms */
termbinop: term ASSIGNOP term /* $x = $y */
{ $$ = newASSIGNOP(OPf_STACKED, $1, IVAL($2), $3);
TOKEN_GETMAD($2,$$,'o');
}
| term POWOP term /* $x ** $y */
{ $$ = newBINOP(IVAL($2), 0, scalar($1), scalar($3));
TOKEN_GETMAD($2,$$,'o');
}
| term MULOP term /* $x * $y, $x x $y */
{ if (IVAL($2) != OP_REPEAT)
scalar($1);
$$ = newBINOP(IVAL($2), 0, $1, scalar($3));
TOKEN_GETMAD($2,$$,'o');
}
| term ADDOP term /* $x + $y */
{ $$ = newBINOP(IVAL($2), 0, scalar($1), scalar($3));
TOKEN_GETMAD($2,$$,'o');
}
| term SHIFTOP term /* $x >> $y, $x << $y */
{ $$ = newBINOP(IVAL($2), 0, scalar($1), scalar($3));
TOKEN_GETMAD($2,$$,'o');
}
| term RELOP term /* $x > $y, etc. */
{ $$ = newBINOP(IVAL($2), 0, scalar($1), scalar($3));
TOKEN_GETMAD($2,$$,'o');
}
| term EQOP term /* $x == $y, $x eq $y */
{ $$ = newBINOP(IVAL($2), 0, scalar($1), scalar($3));
TOKEN_GETMAD($2,$$,'o');
}
| term BITANDOP term /* $x & $y */
{ $$ = newBINOP(IVAL($2), 0, scalar($1), scalar($3));
TOKEN_GETMAD($2,$$,'o');
}
| term BITOROP term /* $x | $y */
{ $$ = newBINOP(IVAL($2), 0, scalar($1), scalar($3));
TOKEN_GETMAD($2,$$,'o');
}
| term DOTDOT term /* $x..$y, $x...$y */
{
$$ = newRANGE(IVAL($2), scalar($1), scalar($3));
DO_MAD({
UNOP *op;
op = (UNOP*)$$;
op = (UNOP*)op->op_first; /* get to flop */
op = (UNOP*)op->op_first; /* get to flip */