[p5sagit/p5-mst-13.2.git] / perly.y

/* $RCSfile: perly.y,v $$Revision: 4.1 $$Date: 92/08/07 18:26:16 $
 *
 *    Copyright (c) 1991, Larry Wall
 *
 *    You may distribute under the terms of either the GNU General Public
 *    License or the Artistic License, as specified in the README file.
 *
 * $Log:	perly.y,v $
 * Revision 4.1  92/08/07  18:26:16  lwall
 * 
 * Revision 4.0.1.5  92/06/11  21:12:50  lwall
 * patch34: expectterm incorrectly set to indicate start of program or block
 * 
 * Revision 4.0.1.4  92/06/08  17:33:25  lwall
 * patch20: one of the backdoors to expectterm was on the wrong reduction
 * 
 * Revision 4.0.1.3  92/06/08  15:18:16  lwall
 * patch20: an expression may now start with a bareword
 * patch20: relaxed requirement for semicolon at the end of a block
 * patch20: added ... as variant on ..
 * patch20: fixed double debug break in foreach with implicit array assignment
 * patch20: if {block} {block} didn't work any more
 * patch20: deleted some minor memory leaks
 * 
 * Revision 4.0.1.2  91/11/05  18:17:38  lwall
 * patch11: extra comma at end of list is now allowed in more places (Hi, Felix!)
 * patch11: once-thru blocks didn't display right in the debugger
 * patch11: debugger got confused over nested subroutine definitions
 * 
 * Revision 4.0.1.1  91/06/07  11:42:34  lwall
 * patch4: new copyright notice
 * 
 * Revision 4.0  91/03/20  01:38:40  lwall
 * 4.0 baseline.
 * 
 */

%{
#include "EXTERN.h"
#include "perl.h"

/*SUPPRESS 530*/
/*SUPPRESS 593*/
/*SUPPRESS 595*/

%}

%start prog

%union {
    I32	ival;
    char *pval;
    OP *opval;
    GV *gvval;
}

%token <ival> '{' ')'

%token <opval> WORD METHOD THING PMFUNC
%token <pval> LABEL
%token <ival> FORMAT SUB PACKAGE
%token <ival> WHILE UNTIL IF UNLESS ELSE ELSIF CONTINUE FOR
%token <ival> LOOPEX DOTDOT
%token <ival> FUNC0 FUNC1 FUNC
%token <ival> RELOP EQOP MULOP ADDOP
%token <ival> DOLSHARP DO LOCAL DELETE HASHBRACK

%type <ival> prog decl format remember crp crb crhb
%type <opval> block lineseq line loop cond nexpr else
%type <opval> expr sexpr term scalar ary hsh arylen star amper sideff
%type <opval> listexpr indirob
%type <opval> texpr listop
%type <pval> label
%type <opval> cont

%nonassoc <ival> LSTOP
%left ','
%right '='
%right '?' ':'
%nonassoc DOTDOT
%left OROR
%left ANDAND
%left <ival> BITOROP
%left <ival> BITANDOP
%nonassoc EQOP
%nonassoc RELOP
%nonassoc <ival> UNIOP
%left <ival> SHIFTOP
%left ADDOP
%left MULOP
%left <ival> MATCHOP ARROW
%right '!' '~' UMINUS REFGEN
%right <ival> POWOP
%nonassoc PREINC PREDEC POSTINC POSTDEC
%left '('

%% /* RULES */

prog	:	/* NULL */
		{
#if defined(YYDEBUG) && defined(DEBUGGING)
		    yydebug = (debug & 1);
#endif
		    expect = XBLOCK;
		}
	/*CONTINUED*/	lineseq
			{   if (in_eval) {
				eval_root = newUNOP(OP_LEAVEEVAL, 0, $2);
				eval_start = linklist(eval_root);
				eval_root->op_next = 0;
				peep(eval_start);
			    }
			    else
				main_root = block_head(scalar($2), &main_start);
			}
	;

block	:	'{' remember lineseq '}'
			{ $$ = scalarseq($3);
			  if (copline > (line_t)$1)
			      copline = $1;
			  if (savestack_ix > $2)
			    leave_scope($2);
			  expect = XBLOCK; }
	;

remember:	/* NULL */	/* in case they push a package name */
			{ $$ = savestack_ix; }
	;

lineseq	:	/* NULL */
			{ $$ = Nullop; }
	|	lineseq decl
			{ $$ = $1; }
	|	lineseq line
			{ $$ = append_list(OP_LINESEQ, $1, $2); pad_reset(); }
	;

line	:	label cond
			{ $$ = newSTATEOP(0, $1, $2); }
	|	loop	/* loops add their own labels */
	|	label ';'
			{ if ($1 != Nullch) {
			      $$ = newSTATEOP(0, $1, newOP(OP_NULL, 0));
			    }
			    else {
			      $$ = Nullop;
			      copline = NOLINE;
			    }
			    expect = XBLOCK; }
	|	label sideff ';'
			{ $$ = newSTATEOP(0, $1, $2);
			  expect = XBLOCK; }
	;

sideff	:	error
			{ $$ = Nullop; }
	|	expr
			{ $$ = $1; }
	|	expr IF expr
			{ $$ = newLOGOP(OP_AND, 0, $3, $1); }
	|	expr UNLESS expr
			{ $$ = newLOGOP(OP_OR, 0, $3, $1); }
	|	expr WHILE expr
			{ $$ = newLOOPOP(0, 1, scalar($3), $1, Nullop); }
	|	expr UNTIL expr
			{ $$ = newLOOPOP(0, 1, invert(scalar($3)), $1, Nullop);}
	;

else	:	/* NULL */
			{ $$ = Nullop; }
	|	ELSE block
			{ $$ = scope($2); }
	|	ELSIF '(' expr ')' block else
			{ copline = $1;
			    $$ = newCONDOP(0, $3, scope($5), $6); }
	;

cond	:	IF '(' expr ')' block else
			{ copline = $1;
			    $$ = newCONDOP(0, $3, scope($5), $6); }
	|	UNLESS '(' expr ')' block else
			{ copline = $1;
			    $$ = newCONDOP(0,
				invert(scalar($3)), scope($5), $6); }
	|	IF block block else
			{ copline = $1;
			    $$ = newCONDOP(0, scope($2), scope($3), $4); }
	|	UNLESS block block else
			{ copline = $1;
			    $$ = newCONDOP(0, invert(scalar(scope($2))),
						scope($3), $4); }
	;

cont	:	/* NULL */
			{ $$ = Nullop; }
	|	CONTINUE block
			{ $$ = scope($2); }
	;

loop	:	label WHILE '(' texpr ')' block cont
			{ copline = $2;
			    $$ = newSTATEOP(0, $1,
				    newWHILEOP(0, 1, Nullop, $4, $6, $7) ); }
	|	label UNTIL '(' expr ')' block cont
			{ copline = $2;
			    $$ = newSTATEOP(0, $1,
				    newWHILEOP(0, 1, Nullop,
					invert(scalar($4)), $6, $7) ); }
	|	label WHILE block block cont
			{ copline = $2;
			    $$ = newSTATEOP(0, $1,
				    newWHILEOP(0, 1, Nullop,
					scope($3), $4, $5) ); }
	|	label UNTIL block block cont
			{ copline = $2;
			    $$ = newSTATEOP(0, $1,
				    newWHILEOP(0, 1, Nullop,
					invert(scalar(scope($3))), $4, $5)); }
	|	label FOR scalar '(' expr crp block cont
			{ $$ = newFOROP(0, $1, $2, ref($3, OP_ENTERLOOP),
				$5, $7, $8); }
	|	label FOR '(' expr crp block cont
			{ $$ = newFOROP(0, $1, $2, Nullop, $4, $6, $7); }
	|	label FOR '(' nexpr ';' texpr ';' nexpr ')' block
			/* basically fake up an initialize-while lineseq */
			{  copline = $2;
			    $$ = append_elem(OP_LINESEQ,
				    newSTATEOP(0, $1, scalar($4)),
				    newSTATEOP(0, $1,
					newWHILEOP(0, 1, Nullop,
					    scalar($6), $10, scalar($8)) )); }
	|	label block cont  /* a block is a loop that happens once */
			{ $$ = newSTATEOP(0,
				$1, newWHILEOP(0, 1, Nullop, Nullop, $2, $3)); }
	;

nexpr	:	/* NULL */
			{ $$ = Nullop; }
	|	sideff
	;

texpr	:	/* NULL means true */
			{ (void)scan_num("1"); $$ = yylval.opval; }
	|	expr
	;

label	:	/* empty */
			{ $$ = Nullch; }
	|	LABEL
	;

decl	:	format
			{ $$ = 0; }
	|	subrout
			{ $$ = 0; }
	|	package
			{ $$ = 0; }
	;

format	:	FORMAT WORD block
			{ newFORM($1, $2, $3); }
	|	FORMAT block
			{ newFORM($1, Nullop, $2); }
	;

subrout	:	SUB WORD block
			{ newSUB($1, $2, $3); }
	;

package :	PACKAGE WORD ';'
			{ package($2); }
	;

expr	:	expr ',' sexpr
			{ $$ = append_elem(OP_LIST, $1, $3); }
	|	sexpr
	;

listop	:	LSTOP indirob listexpr
			{ $$ = convert($1, OPf_STACKED,
				prepend_elem(OP_LIST, newGVREF($2), $3) ); }
	|	FUNC '(' indirob listexpr ')'
			{ $$ = convert($1, OPf_STACKED,
				prepend_elem(OP_LIST, newGVREF($3), $4) ); }
	|	indirob ARROW LSTOP listexpr
			{ $$ = convert($3, OPf_STACKED,
				prepend_elem(OP_LIST, newGVREF($1), $4) ); }
	|	indirob ARROW FUNC '(' listexpr ')'
			{ $$ = convert($3, OPf_STACKED,
				prepend_elem(OP_LIST, newGVREF($1), $5) ); }
	|	term ARROW METHOD '(' listexpr ')'
			{ $$ = convert(OP_ENTERSUBR, OPf_STACKED|OPf_SPECIAL,
				prepend_elem(OP_LIST, newMETHOD($1,$3), $5)); }
	|	METHOD indirob listexpr
			{ $$ = convert(OP_ENTERSUBR, OPf_STACKED|OPf_SPECIAL,
				prepend_elem(OP_LIST, newMETHOD($2,$1), $3)); }
	|	LSTOP listexpr
			{ $$ = convert($1, 0, $2); }
	|	FUNC '(' listexpr ')'
			{ $$ = convert($1, 0, $3); }
	;

sexpr	:	sexpr '=' sexpr
			{ $$ = newASSIGNOP(OPf_STACKED, $1, $3); }
	|	sexpr POWOP '=' sexpr
			{ $$ = newBINOP($2, OPf_STACKED,
				ref(scalar($1), $2), scalar($4)); }
	|	sexpr MULOP '=' sexpr
			{ $$ = newBINOP($2, OPf_STACKED,
				ref(scalar($1), $2), scalar($4)); }
	|	sexpr ADDOP '=' sexpr
			{ $$ = newBINOP($2, OPf_STACKED,
				ref(scalar($1), $2), scalar($4));}
	|	sexpr SHIFTOP '=' sexpr
			{ $$ = newBINOP($2, OPf_STACKED,
				ref(scalar($1), $2), scalar($4)); }
	|	sexpr BITANDOP '=' sexpr
			{ $$ = newBINOP($2, OPf_STACKED,
				ref(scalar($1), $2), scalar($4)); }
	|	sexpr BITOROP '=' sexpr
			{ $$ = newBINOP($2, OPf_STACKED,
				ref(scalar($1), $2), scalar($4)); }
	|	sexpr ANDAND '=' sexpr
			{ $$ = newLOGOP(OP_ANDASSIGN, 0,
				ref(scalar($1), OP_ANDASSIGN),
				newUNOP(OP_SASSIGN, 0, scalar($4))); }
	|	sexpr OROR '=' sexpr
			{ $$ = newLOGOP(OP_ORASSIGN, 0,
				ref(scalar($1), OP_ORASSIGN),
				newUNOP(OP_SASSIGN, 0, scalar($4))); }


	|	sexpr POWOP sexpr
			{ $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
	|	sexpr MULOP sexpr
			{   if ($2 != OP_REPEAT)
				scalar($1);
			    $$ = newBINOP($2, 0, $1, scalar($3)); }
	|	sexpr ADDOP sexpr
			{ $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
	|	sexpr SHIFTOP sexpr
			{ $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
	|	sexpr RELOP sexpr
			{ $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
	|	sexpr EQOP sexpr
			{ $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
	|	sexpr BITANDOP sexpr
			{ $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
	|	sexpr BITOROP sexpr
			{ $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
	|	sexpr DOTDOT sexpr
			{ $$ = newRANGE($2, scalar($1), scalar($3));}
	|	sexpr ANDAND sexpr
			{ $$ = newLOGOP(OP_AND, 0, $1, $3); }
	|	sexpr OROR sexpr
			{ $$ = newLOGOP(OP_OR, 0, $1, $3); }
	|	sexpr '?' sexpr ':' sexpr
			{ $$ = newCONDOP(0, $1, $3, $5); }
	|	sexpr MATCHOP sexpr
			{ $$ = bind_match($2, $1, $3); }
	|	term
			{ $$ = $1; }
	;

term	:	'-' term %prec UMINUS
			{ $$ = newUNOP(OP_NEGATE, 0, scalar($2)); }
	|	'+' term %prec UMINUS
			{ $$ = $2; }
	|	'!' term
			{ $$ = newUNOP(OP_NOT, 0, scalar($2)); }
	|	'~' term
			{ $$ = newUNOP(OP_COMPLEMENT, 0, scalar($2));}
	|	REFGEN term
			{ $$ = newUNOP(OP_REFGEN, 0, ref($2, OP_REFGEN)); }
	|	term POSTINC
			{ $$ = newUNOP(OP_POSTINC, 0,
					ref(scalar($1), OP_POSTINC)); }
	|	term POSTDEC
			{ $$ = newUNOP(OP_POSTDEC, 0,
					ref(scalar($1), OP_POSTDEC)); }
	|	PREINC term
			{ $$ = newUNOP(OP_PREINC, 0,
					ref(scalar($2), OP_PREINC)); }
	|	PREDEC term
			{ $$ = newUNOP(OP_PREDEC, 0,
					ref(scalar($2), OP_PREDEC)); }
	|	LOCAL sexpr	%prec UNIOP
			{ $$ = localize($2); }
	|	'(' expr crp
			{ $$ = sawparens($2); }
	|	'(' ')'
			{ $$ = newNULLLIST(); }
	|	'[' expr crb				%prec '('
			{ $$ = newANONLIST($2); }
	|	'[' ']'					%prec '('
			{ $$ = newANONLIST(Nullop); }
	|	HASHBRACK expr crhb			%prec '('
			{ $$ = newANONHASH($2); }
	|	HASHBRACK ';' '}'				%prec '('
			{ $$ = newANONHASH(Nullop); }
	|	scalar	%prec '('
			{ $$ = $1; }
	|	star	%prec '('
			{ $$ = $1; }
	|	scalar '[' expr ']'	%prec '('
			{ $$ = newBINOP(OP_AELEM, 0, oopsAV($1), scalar($3)); }
	|	term ARROW '[' expr ']'	%prec '('
			{ $$ = newBINOP(OP_AELEM, 0,
					scalar(ref(newAVREF($1),OP_RV2AV)),
					scalar($4));}
	|	hsh 	%prec '('
			{ $$ = $1; }
	|	ary 	%prec '('
			{ $$ = $1; }
	|	arylen 	%prec '('
			{ $$ = newUNOP(OP_AV2ARYLEN, 0, ref($1, OP_AV2ARYLEN));}
	|	scalar '{' expr ';' '}'	%prec '('
			{ $$ = newBINOP(OP_HELEM, 0, oopsHV($1), jmaybe($3));
			    expect = XOPERATOR; }
	|	term ARROW '{' expr ';' '}'	%prec '('
			{ $$ = newBINOP(OP_HELEM, 0,
					scalar(ref(newHVREF($1),OP_RV2HV)),
					jmaybe($4));
			    expect = XOPERATOR; }
	|	'(' expr crp '[' expr ']'	%prec '('
			{ $$ = newSLICEOP(0, $5, $2); }
	|	'(' ')' '[' expr ']'	%prec '('
			{ $$ = newSLICEOP(0, $4, Nullop); }
	|	ary '[' expr ']'	%prec '('
			{ $$ = prepend_elem(OP_ASLICE,
				newOP(OP_PUSHMARK, 0),
				list(
				    newLISTOP(OP_ASLICE, 0,
					list($3),
					ref($1, OP_ASLICE)))); }
	|	ary '{' expr ';' '}'	%prec '('
			{ $$ = prepend_elem(OP_HSLICE,
				newOP(OP_PUSHMARK, 0),
				list(
				    newLISTOP(OP_HSLICE, 0,
					list($3),
					ref(oopsHV($1), OP_HSLICE))));
			    expect = XOPERATOR; }
	|	DELETE scalar '{' expr ';' '}'	%prec '('
			{ $$ = newBINOP(OP_DELETE, 0, oopsHV($2), jmaybe($4));
			    expect = XOPERATOR; }
	|	DELETE '(' scalar '{' expr ';' '}' ')'	%prec '('
			{ $$ = newBINOP(OP_DELETE, 0, oopsHV($3), jmaybe($5));
			    expect = XOPERATOR; }
	|	THING	%prec '('
			{ $$ = $1; }
	|	amper
			{ $$ = newUNOP(OP_ENTERSUBR, 0,
				scalar($1)); }
	|	amper '(' ')'
			{ $$ = newUNOP(OP_ENTERSUBR, OPf_STACKED, scalar($1)); }
	|	amper '(' expr crp
			{ $$ = newUNOP(OP_ENTERSUBR, OPf_STACKED,
			    list(prepend_elem(OP_LIST, scalar($1), $3))); }
	|	DO sexpr	%prec UNIOP
			{ $$ = newUNOP(OP_DOFILE, 0, scalar($2));
			  allgvs = TRUE;}
	|	DO block	%prec '('
			{ $$ = newUNOP(OP_NULL, OPf_SPECIAL, scope($2)); }
	|	DO WORD '(' ')'
			{ $$ = newUNOP(OP_ENTERSUBR, OPf_SPECIAL|OPf_STACKED,
			    list(prepend_elem(OP_LIST,
				scalar(newCVREF(scalar($2))), newNULLLIST()))); }
	|	DO WORD '(' expr crp
			{ $$ = newUNOP(OP_ENTERSUBR, OPf_SPECIAL|OPf_STACKED,
			    list(prepend_elem(OP_LIST,
				scalar(newCVREF(scalar($2))),
				$4))); }
	|	DO scalar '(' ')'
			{ $$ = newUNOP(OP_ENTERSUBR, OPf_SPECIAL|OPf_STACKED,
			    list(prepend_elem(OP_LIST,
				scalar(newCVREF(scalar($2))), newNULLLIST())));}
	|	DO scalar '(' expr crp
			{ $$ = newUNOP(OP_ENTERSUBR, OPf_SPECIAL|OPf_STACKED,
			    list(prepend_elem(OP_LIST,
				scalar(newCVREF(scalar($2))),
				$4))); }
	|	LOOPEX
			{ $$ = newOP($1, OPf_SPECIAL); }
	|	LOOPEX WORD
			{ $$ = newPVOP($1, 0,
				savestr(SvPVnx(((SVOP*)$2)->op_sv)));
			    op_free($2); }
	|	UNIOP
			{ $$ = newOP($1, 0); }
	|	UNIOP block
			{ $$ = newUNOP($1, 0, $2); }
	|	UNIOP sexpr
			{ $$ = newUNOP($1, 0, $2); }
	|	FUNC0
			{ $$ = newOP($1, 0); }
	|	FUNC0 '(' ')'
			{ $$ = newOP($1, 0); }
	|	FUNC1 '(' ')'
			{ $$ = newOP($1, OPf_SPECIAL); }
	|	FUNC1 '(' expr ')'
			{ $$ = newUNOP($1, 0, $3); }
	|	PMFUNC '(' sexpr ')'
			{ $$ = pmruntime($1, $3, Nullop); }
	|	PMFUNC '(' sexpr ',' sexpr ')'
			{ $$ = pmruntime($1, $3, $5); }
	|	WORD
	|	listop
	;

listexpr:	/* NULL */
			{ $$ = newNULLLIST(); }
	|	expr
			{ $$ = $1; }
	;

amper	:	'&' indirob
			{ $$ = newCVREF($2); }
	;

scalar	:	'$' indirob
			{ $$ = newSVREF($2); }
	;

ary	:	'@' indirob
			{ $$ = newAVREF($2); }
	;

hsh	:	'%' indirob
			{ $$ = newHVREF($2); }
	;

arylen	:	DOLSHARP indirob
			{ $$ = newAVREF($2); }
	;

star	:	'*' indirob
			{ $$ = newGVREF($2); }
	;

indirob	:	WORD
			{ $$ = scalar($1); }
	|	scalar
			{ $$ = scalar($1); }
	|	block
			{ $$ = scalar(scope($1)); }

	;

crp	:	',' ')'
			{ $$ = 1; }
	|	')'
			{ $$ = 0; }
	;

crb	:	',' ']'
			{ $$ = 1; }
	|	']'
			{ $$ = 0; }
	;

crhb	:	',' ';' '}'
			{ $$ = 1; }
	|	';' '}'
			{ $$ = 0; }
	;

%% /* PROGRAM */
Commit	Line	Data
79072805	1	/* $RCSfile: perly.y,v $$Revision: 4.1 $$Date: 92/08/07 18:26:16 $
a687059c	2	*
9ef589d8	3	* Copyright (c) 1991, Larry Wall
a687059c	4	*
9ef589d8	5	* You may distribute under the terms of either the GNU General Public
9ef589d8	6	* License or the Artistic License, as specified in the README file.
8d063cd8	7	*
fe14fcc3	8	* $Log: perly.y,v $
79072805	9	* Revision 4.1 92/08/07 18:26:16 lwall
79072805	10	*
faf8582f	11	* Revision 4.0.1.5 92/06/11 21:12:50 lwall
	12	* patch34: expectterm incorrectly set to indicate start of program or block
	13	*
32c2e4fb	14	* Revision 4.0.1.4 92/06/08 17:33:25 lwall
	15	* patch20: one of the backdoors to expectterm was on the wrong reduction
	16	*
	17	* Revision 4.0.1.3 92/06/08 15:18:16 lwall
	18	* patch20: an expression may now start with a bareword
	19	* patch20: relaxed requirement for semicolon at the end of a block
	20	* patch20: added ... as variant on ..
	21	* patch20: fixed double debug break in foreach with implicit array assignment
	22	* patch20: if {block} {block} didn't work any more
	23	* patch20: deleted some minor memory leaks
	24	*
f0fcb552	25	* Revision 4.0.1.2 91/11/05 18:17:38 lwall
	26	* patch11: extra comma at end of list is now allowed in more places (Hi, Felix!)
	27	* patch11: once-thru blocks didn't display right in the debugger
	28	* patch11: debugger got confused over nested subroutine definitions
	29	*
9ef589d8	30	* Revision 4.0.1.1 91/06/07 11:42:34 lwall
	31	* patch4: new copyright notice
	32	*
fe14fcc3	33	* Revision 4.0 91/03/20 01:38:40 lwall
fe14fcc3	34	* 4.0 baseline.
8d063cd8	35	*
	36	*/
	37
	38	%{
79072805	39	#include "EXTERN.h"
8d063cd8	40	#include "perl.h"
378cc40b	41
f0fcb552	42	/SUPPRESS 530/
	43	/SUPPRESS 593/
	44	/SUPPRESS 595/
	45
8d063cd8	46	%}
	47
	48	%start prog
	49
	50	%union {
79072805	51	I32 ival;
	52	char *pval;
	53	OP *opval;
	54	GV *gvval;
8d063cd8	55	}
8d063cd8	56
f0fcb552	57	%token <ival> '{' ')'
f0fcb552	58
79072805	59	%token <opval> WORD METHOD THING PMFUNC
	60	%token <pval> LABEL
	61	%token <ival> FORMAT SUB PACKAGE
	62	%token <ival> WHILE UNTIL IF UNLESS ELSE ELSIF CONTINUE FOR
	63	%token <ival> LOOPEX DOTDOT
	64	%token <ival> FUNC0 FUNC1 FUNC
	65	%token <ival> RELOP EQOP MULOP ADDOP
	66	%token <ival> DOLSHARP DO LOCAL DELETE HASHBRACK
	67
	68	%type <ival> prog decl format remember crp crb crhb
	69	%type <opval> block lineseq line loop cond nexpr else
	70	%type <opval> expr sexpr term scalar ary hsh arylen star amper sideff
	71	%type <opval> listexpr indirob
	72	%type <opval> texpr listop
	73	%type <pval> label
	74	%type <opval> cont
	75
	76	%nonassoc <ival> LSTOP
8d063cd8	77	%left ','
8d063cd8	78	%right '='
	79	%right '?' ':'
	80	%nonassoc DOTDOT
	81	%left OROR
	82	%left ANDAND
79072805	83	%left <ival> BITOROP
79072805	84	%left <ival> BITANDOP
a687059c	85	%nonassoc EQOP
a687059c	86	%nonassoc RELOP
378cc40b	87	%nonassoc <ival> UNIOP
79072805	88	%left <ival> SHIFTOP
a687059c	89	%left ADDOP
a687059c	90	%left MULOP
79072805	91	%left <ival> MATCHOP ARROW
	92	%right '!' '~' UMINUS REFGEN
	93	%right <ival> POWOP
	94	%nonassoc PREINC PREDEC POSTINC POSTDEC
8d063cd8	95	%left '('
	96
	97	%% /* RULES */
	98
ae986130	99	prog : /* NULL */
	100	{
	101	#if defined(YYDEBUG) && defined(DEBUGGING)
	102	yydebug = (debug & 1);
	103	#endif
79072805	104	expect = XBLOCK;
ae986130	105	}
ae986130	106	/CONTINUED/ lineseq
79072805	107	{ if (in_eval) {
	108	eval_root = newUNOP(OP_LEAVEEVAL, 0, $2);
	109	eval_start = linklist(eval_root);
	110	eval_root->op_next = 0;
	111	peep(eval_start);
	112	}
a559c259	113	else
79072805	114	main_root = block_head(scalar($2), &main_start);
79072805	115	}
8d063cd8	116	;
8d063cd8	117
a687059c	118	block : '{' remember lineseq '}'
79072805	119	{ $$ = scalarseq($3);
	120	if (copline > (line_t)$1)
	121	copline = $1;
	122	if (savestack_ix > $2)
	123	leave_scope($2);
	124	expect = XBLOCK; }
a687059c	125	;
	126
	127	remember: /* NULL / / in case they push a package name */
79072805	128	{ $$ = savestack_ix; }
8d063cd8	129	;
	130
	131	lineseq : /* NULL */
79072805	132	{ $$ = Nullop; }
	133	\| lineseq decl
	134	{ $$ = $1; }
8d063cd8	135	\| lineseq line
79072805	136	{ $$ = append_list(OP_LINESEQ, $1, $2); pad_reset(); }
8d063cd8	137	;
8d063cd8	138
79072805	139	line : label cond
79072805	140	{ $$ = newSTATEOP(0, $1, $2); }
8d063cd8	141	\| loop /* loops add their own labels */
	142	\| label ';'
	143	{ if ($1 != Nullch) {
79072805	144	$$ = newSTATEOP(0, $1, newOP(OP_NULL, 0));
450a55e4	145	}
450a55e4	146	else {
79072805	147	$$ = Nullop;
79072805	148	copline = NOLINE;
32c2e4fb	149	}
79072805	150	expect = XBLOCK; }
8d063cd8	151	\| label sideff ';'
79072805	152	{ $$ = newSTATEOP(0, $1, $2);
79072805	153	expect = XBLOCK; }
8d063cd8	154	;
8d063cd8	155
a687059c	156	sideff : error
79072805	157	{ $$ = Nullop; }
a687059c	158	\| expr
79072805	159	{ $$ = $1; }
a687059c	160	\| expr IF expr
79072805	161	{ $$ = newLOGOP(OP_AND, 0, $3, $1); }
a687059c	162	\| expr UNLESS expr
79072805	163	{ $$ = newLOGOP(OP_OR, 0, $3, $1); }
a687059c	164	\| expr WHILE expr
79072805	165	{ $$ = newLOOPOP(0, 1, scalar($3), $1, Nullop); }
a687059c	166	\| expr UNTIL expr
79072805	167	{ $$ = newLOOPOP(0, 1, invert(scalar($3)), $1, Nullop);}
	168	;
	169
	170	else : /* NULL */
	171	{ $$ = Nullop; }
	172	\| ELSE block
	173	{ $$ = scope($2); }
	174	\| ELSIF '(' expr ')' block else
	175	{ copline = $1;
	176	$$ = newCONDOP(0, $3, scope($5), $6); }
	177	;
	178
	179	cond : IF '(' expr ')' block else
	180	{ copline = $1;
	181	$$ = newCONDOP(0, $3, scope($5), $6); }
	182	\| UNLESS '(' expr ')' block else
	183	{ copline = $1;
	184	$$ = newCONDOP(0,
	185	invert(scalar($3)), scope($5), $6); }
	186	\| IF block block else
	187	{ copline = $1;
	188	$$ = newCONDOP(0, scope($2), scope($3), $4); }
	189	\| UNLESS block block else
	190	{ copline = $1;
	191	$$ = newCONDOP(0, invert(scalar(scope($2))),
	192	scope($3), $4); }
	193	;
	194
	195	cont : /* NULL */
	196	{ $$ = Nullop; }
	197	\| CONTINUE block
	198	{ $$ = scope($2); }
	199	;
	200
	201	loop : label WHILE '(' texpr ')' block cont
	202	{ copline = $2;
	203	$$ = newSTATEOP(0, $1,
	204	newWHILEOP(0, 1, Nullop, $4, $6, $7) ); }
	205	\| label UNTIL '(' expr ')' block cont
	206	{ copline = $2;
	207	$$ = newSTATEOP(0, $1,
	208	newWHILEOP(0, 1, Nullop,
	209	invert(scalar($4)), $6, $7) ); }
	210	\| label WHILE block block cont
	211	{ copline = $2;
	212	$$ = newSTATEOP(0, $1,
	213	newWHILEOP(0, 1, Nullop,
	214	scope($3), $4, $5) ); }
	215	\| label UNTIL block block cont
	216	{ copline = $2;
	217	$$ = newSTATEOP(0, $1,
	218	newWHILEOP(0, 1, Nullop,
	219	invert(scalar(scope($3))), $4, $5)); }
	220	\| label FOR scalar '(' expr crp block cont
	221	{ $$ = newFOROP(0, $1, $2, ref($3, OP_ENTERLOOP),
	222	$5, $7, $8); }
	223	\| label FOR '(' expr crp block cont
	224	{ $$ = newFOROP(0, $1, $2, Nullop, $4, $6, $7); }
8d063cd8	225	\| label FOR '(' nexpr ';' texpr ';' nexpr ')' block
8d063cd8	226	/* basically fake up an initialize-while lineseq */
79072805	227	{ copline = $2;
	228	$$ = append_elem(OP_LINESEQ,
	229	newSTATEOP(0, $1, scalar($4)),
	230	newSTATEOP(0, $1,
	231	newWHILEOP(0, 1, Nullop,
	232	scalar($6), $10, scalar($8)) )); }
	233	\| label block cont /* a block is a loop that happens once */
	234	{ $$ = newSTATEOP(0,
	235	$1, newWHILEOP(0, 1, Nullop, Nullop, $2, $3)); }
8d063cd8	236	;
	237
	238	nexpr : /* NULL */
79072805	239	{ $$ = Nullop; }
8d063cd8	240	\| sideff
	241	;
	242
	243	texpr : /* NULL means true */
79072805	244	{ (void)scan_num("1"); $$ = yylval.opval; }
8d063cd8	245	\| expr
	246	;
	247
	248	label : /* empty */
	249	{ $$ = Nullch; }
32c2e4fb	250	\| LABEL
8d063cd8	251	;
8d063cd8	252
8d063cd8	253	decl : format
	254	{ $$ = 0; }
	255	\| subrout
	256	{ $$ = 0; }
a687059c	257	\| package
a687059c	258	{ $$ = 0; }
8d063cd8	259	;
8d063cd8	260
79072805	261	format : FORMAT WORD block
	262	{ newFORM($1, $2, $3); }
	263	\| FORMAT block
	264	{ newFORM($1, Nullop, $2); }
8d063cd8	265	;
	266
	267	subrout : SUB WORD block
79072805	268	{ newSUB($1, $2, $3); }
8d063cd8	269	;
8d063cd8	270
a687059c	271	package : PACKAGE WORD ';'
79072805	272	{ package($2); }
a687059c	273	;
	274
	275	expr : expr ',' sexpr
79072805	276	{ $$ = append_elem(OP_LIST, $1, $3); }
8d063cd8	277	\| sexpr
	278	;
	279
79072805	280	listop : LSTOP indirob listexpr
	281	{ $$ = convert($1, OPf_STACKED,
	282	prepend_elem(OP_LIST, newGVREF($2), $3) ); }
	283	\| FUNC '(' indirob listexpr ')'
	284	{ $$ = convert($1, OPf_STACKED,
	285	prepend_elem(OP_LIST, newGVREF($3), $4) ); }
	286	\| indirob ARROW LSTOP listexpr
	287	{ $$ = convert($3, OPf_STACKED,
	288	prepend_elem(OP_LIST, newGVREF($1), $4) ); }
	289	\| indirob ARROW FUNC '(' listexpr ')'
	290	{ $$ = convert($3, OPf_STACKED,
	291	prepend_elem(OP_LIST, newGVREF($1), $5) ); }
	292	\| term ARROW METHOD '(' listexpr ')'
	293	{ $$ = convert(OP_ENTERSUBR, OPf_STACKED\|OPf_SPECIAL,
	294	prepend_elem(OP_LIST, newMETHOD($1,$3), $5)); }
	295	\| METHOD indirob listexpr
	296	{ $$ = convert(OP_ENTERSUBR, OPf_STACKED\|OPf_SPECIAL,
	297	prepend_elem(OP_LIST, newMETHOD($2,$1), $3)); }
	298	\| LSTOP listexpr
	299	{ $$ = convert($1, 0, $2); }
	300	\| FUNC '(' listexpr ')'
	301	{ $$ = convert($1, 0, $3); }
a687059c	302	;
a687059c	303
8d063cd8	304	sexpr : sexpr '=' sexpr
79072805	305	{ $$ = newASSIGNOP(OPf_STACKED, $1, $3); }
	306	\| sexpr POWOP '=' sexpr
	307	{ $$ = newBINOP($2, OPf_STACKED,
	308	ref(scalar($1), $2), scalar($4)); }
a687059c	309	\| sexpr MULOP '=' sexpr
79072805	310	{ $$ = newBINOP($2, OPf_STACKED,
79072805	311	ref(scalar($1), $2), scalar($4)); }
a687059c	312	\| sexpr ADDOP '=' sexpr
79072805	313	{ $$ = newBINOP($2, OPf_STACKED,
	314	ref(scalar($1), $2), scalar($4));}
	315	\| sexpr SHIFTOP '=' sexpr
	316	{ $$ = newBINOP($2, OPf_STACKED,
	317	ref(scalar($1), $2), scalar($4)); }
	318	\| sexpr BITANDOP '=' sexpr
	319	{ $$ = newBINOP($2, OPf_STACKED,
	320	ref(scalar($1), $2), scalar($4)); }
	321	\| sexpr BITOROP '=' sexpr
	322	{ $$ = newBINOP($2, OPf_STACKED,
	323	ref(scalar($1), $2), scalar($4)); }
	324	\| sexpr ANDAND '=' sexpr
	325	{ $$ = newLOGOP(OP_ANDASSIGN, 0,
	326	ref(scalar($1), OP_ANDASSIGN),
	327	newUNOP(OP_SASSIGN, 0, scalar($4))); }
	328	\| sexpr OROR '=' sexpr
	329	{ $$ = newLOGOP(OP_ORASSIGN, 0,
	330	ref(scalar($1), OP_ORASSIGN),
	331	newUNOP(OP_SASSIGN, 0, scalar($4))); }
	332
	333
	334	\| sexpr POWOP sexpr
	335	{ $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
a687059c	336	\| sexpr MULOP sexpr
79072805	337	{ if ($2 != OP_REPEAT)
	338	scalar($1);
	339	$$ = newBINOP($2, 0, $1, scalar($3)); }
a687059c	340	\| sexpr ADDOP sexpr
79072805	341	{ $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
	342	\| sexpr SHIFTOP sexpr
	343	{ $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
a687059c	344	\| sexpr RELOP sexpr
79072805	345	{ $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
a687059c	346	\| sexpr EQOP sexpr
79072805	347	{ $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
	348	\| sexpr BITANDOP sexpr
	349	{ $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
	350	\| sexpr BITOROP sexpr
	351	{ $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
8d063cd8	352	\| sexpr DOTDOT sexpr
79072805	353	{ $$ = newRANGE($2, scalar($1), scalar($3));}
8d063cd8	354	\| sexpr ANDAND sexpr
79072805	355	{ $$ = newLOGOP(OP_AND, 0, $1, $3); }
8d063cd8	356	\| sexpr OROR sexpr
79072805	357	{ $$ = newLOGOP(OP_OR, 0, $1, $3); }
8d063cd8	358	\| sexpr '?' sexpr ':' sexpr
79072805	359	{ $$ = newCONDOP(0, $1, $3, $5); }
	360	\| sexpr MATCHOP sexpr
	361	{ $$ = bind_match($2, $1, $3); }
8d063cd8	362	\| term
	363	{ $$ = $1; }
	364	;
	365
	366	term : '-' term %prec UMINUS
79072805	367	{ $$ = newUNOP(OP_NEGATE, 0, scalar($2)); }
a687059c	368	\| '+' term %prec UMINUS
a687059c	369	{ $$ = $2; }
8d063cd8	370	\| '!' term
79072805	371	{ $$ = newUNOP(OP_NOT, 0, scalar($2)); }
8d063cd8	372	\| '~' term
79072805	373	{ $$ = newUNOP(OP_COMPLEMENT, 0, scalar($2));}
	374	\| REFGEN term
	375	{ $$ = newUNOP(OP_REFGEN, 0, ref($2, OP_REFGEN)); }
	376	\| term POSTINC
	377	{ $$ = newUNOP(OP_POSTINC, 0,
	378	ref(scalar($1), OP_POSTINC)); }
	379	\| term POSTDEC
	380	{ $$ = newUNOP(OP_POSTDEC, 0,
	381	ref(scalar($1), OP_POSTDEC)); }
	382	\| PREINC term
	383	{ $$ = newUNOP(OP_PREINC, 0,
	384	ref(scalar($2), OP_PREINC)); }
	385	\| PREDEC term
	386	{ $$ = newUNOP(OP_PREDEC, 0,
	387	ref(scalar($2), OP_PREDEC)); }
	388	\| LOCAL sexpr %prec UNIOP
	389	{ $$ = localize($2); }
f0fcb552	390	\| '(' expr crp
79072805	391	{ $$ = sawparens($2); }
8d063cd8	392	\| '(' ')'
79072805	393	{ $$ = newNULLLIST(); }
	394	\| '[' expr crb %prec '('
	395	{ $$ = newANONLIST($2); }
	396	\| '[' ']' %prec '('
	397	{ $$ = newANONLIST(Nullop); }
	398	\| HASHBRACK expr crhb %prec '('
	399	{ $$ = newANONHASH($2); }
	400	\| HASHBRACK ';' '}' %prec '('
	401	{ $$ = newANONHASH(Nullop); }
	402	\| scalar %prec '('
8d063cd8	403	{ $$ = $1; }
79072805	404	\| star %prec '('
8d063cd8	405	{ $$ = $1; }
79072805	406	\| scalar '[' expr ']' %prec '('
	407	{ $$ = newBINOP(OP_AELEM, 0, oopsAV($1), scalar($3)); }
	408	\| term ARROW '[' expr ']' %prec '('
	409	{ $$ = newBINOP(OP_AELEM, 0,
	410	scalar(ref(newAVREF($1),OP_RV2AV)),
	411	scalar($4));}
	412	\| hsh %prec '('
8d063cd8	413	{ $$ = $1; }
79072805	414	\| ary %prec '('
8d063cd8	415	{ $$ = $1; }
79072805	416	\| arylen %prec '('
	417	{ $$ = newUNOP(OP_AV2ARYLEN, 0, ref($1, OP_AV2ARYLEN));}
	418	\| scalar '{' expr ';' '}' %prec '('
	419	{ $$ = newBINOP(OP_HELEM, 0, oopsHV($1), jmaybe($3));
	420	expect = XOPERATOR; }
	421	\| term ARROW '{' expr ';' '}' %prec '('
	422	{ $$ = newBINOP(OP_HELEM, 0,
	423	scalar(ref(newHVREF($1),OP_RV2HV)),
	424	jmaybe($4));
	425	expect = XOPERATOR; }
	426	\| '(' expr crp '[' expr ']' %prec '('
	427	{ $$ = newSLICEOP(0, $5, $2); }
	428	\| '(' ')' '[' expr ']' %prec '('
	429	{ $$ = newSLICEOP(0, $4, Nullop); }
	430	\| ary '[' expr ']' %prec '('
	431	{ $$ = prepend_elem(OP_ASLICE,
	432	newOP(OP_PUSHMARK, 0),
	433	list(
	434	newLISTOP(OP_ASLICE, 0,
	435	list($3),
	436	ref($1, OP_ASLICE)))); }
	437	\| ary '{' expr ';' '}' %prec '('
	438	{ $$ = prepend_elem(OP_HSLICE,
	439	newOP(OP_PUSHMARK, 0),
	440	list(
	441	newLISTOP(OP_HSLICE, 0,
	442	list($3),
	443	ref(oopsHV($1), OP_HSLICE))));
	444	expect = XOPERATOR; }
	445	\| DELETE scalar '{' expr ';' '}' %prec '('
	446	{ $$ = newBINOP(OP_DELETE, 0, oopsHV($2), jmaybe($4));
	447	expect = XOPERATOR; }
	448	\| DELETE '(' scalar '{' expr ';' '}' ')' %prec '('
	449	{ $$ = newBINOP(OP_DELETE, 0, oopsHV($3), jmaybe($5));
	450	expect = XOPERATOR; }
	451	\| THING %prec '('
	452	{ $$ = $1; }
	453	\| amper
	454	{ $$ = newUNOP(OP_ENTERSUBR, 0,
	455	scalar($1)); }
	456	\| amper '(' ')'
	457	{ $$ = newUNOP(OP_ENTERSUBR, OPf_STACKED, scalar($1)); }
	458	\| amper '(' expr crp
	459	{ $$ = newUNOP(OP_ENTERSUBR, OPf_STACKED,
	460	list(prepend_elem(OP_LIST, scalar($1), $3))); }
	461	\| DO sexpr %prec UNIOP
	462	{ $$ = newUNOP(OP_DOFILE, 0, scalar($2));
	463	allgvs = TRUE;}
	464	\| DO block %prec '('
	465	{ $$ = newUNOP(OP_NULL, OPf_SPECIAL, scope($2)); }
8d063cd8	466	\| DO WORD '(' ')'
79072805	467	{ $$ = newUNOP(OP_ENTERSUBR, OPf_SPECIAL\|OPf_STACKED,
	468	list(prepend_elem(OP_LIST,
	469	scalar(newCVREF(scalar($2))), newNULLLIST()))); }
	470	\| DO WORD '(' expr crp
	471	{ $$ = newUNOP(OP_ENTERSUBR, OPf_SPECIAL\|OPf_STACKED,
	472	list(prepend_elem(OP_LIST,
	473	scalar(newCVREF(scalar($2))),
	474	$4))); }
	475	\| DO scalar '(' ')'
	476	{ $$ = newUNOP(OP_ENTERSUBR, OPf_SPECIAL\|OPf_STACKED,
	477	list(prepend_elem(OP_LIST,
	478	scalar(newCVREF(scalar($2))), newNULLLIST())));}
	479	\| DO scalar '(' expr crp
	480	{ $$ = newUNOP(OP_ENTERSUBR, OPf_SPECIAL\|OPf_STACKED,
	481	list(prepend_elem(OP_LIST,
	482	scalar(newCVREF(scalar($2))),
	483	$4))); }
8d063cd8	484	\| LOOPEX
79072805	485	{ $$ = newOP($1, OPf_SPECIAL); }
8d063cd8	486	\| LOOPEX WORD
79072805	487	{ $$ = newPVOP($1, 0,
	488	savestr(SvPVnx(((SVOP*)$2)->op_sv)));
	489	op_free($2); }
8d063cd8	490	\| UNIOP
79072805	491	{ $$ = newOP($1, 0); }
f0fcb552	492	\| UNIOP block
79072805	493	{ $$ = newUNOP($1, 0, $2); }
8d063cd8	494	\| UNIOP sexpr
79072805	495	{ $$ = newUNOP($1, 0, $2); }
8d063cd8	496	\| FUNC0
79072805	497	{ $$ = newOP($1, 0); }
ae986130	498	\| FUNC0 '(' ')'
79072805	499	{ $$ = newOP($1, 0); }
03a14243	500	\| FUNC1 '(' ')'
79072805	501	{ $$ = newOP($1, OPf_SPECIAL); }
8d063cd8	502	\| FUNC1 '(' expr ')'
79072805	503	{ $$ = newUNOP($1, 0, $3); }
	504	\| PMFUNC '(' sexpr ')'
	505	{ $$ = pmruntime($1, $3, Nullop); }
	506	\| PMFUNC '(' sexpr ',' sexpr ')'
	507	{ $$ = pmruntime($1, $3, $5); }
	508	\| WORD
378cc40b	509	\| listop
8d063cd8	510	;
8d063cd8	511
79072805	512	listexpr: /* NULL */
	513	{ $$ = newNULLLIST(); }
	514	\| expr
	515	{ $$ = $1; }
	516	;
	517
	518	amper : '&' indirob
	519	{ $$ = newCVREF($2); }
a687059c	520	;
a687059c	521
79072805	522	scalar : '$' indirob
79072805	523	{ $$ = newSVREF($2); }
a687059c	524	;
a687059c	525
79072805	526	ary : '@' indirob
	527	{ $$ = newAVREF($2); }
	528	;
	529
	530	hsh : '%' indirob
	531	{ $$ = newHVREF($2); }
	532	;
	533
	534	arylen : DOLSHARP indirob
	535	{ $$ = newAVREF($2); }
	536	;
	537
	538	star : '*' indirob
	539	{ $$ = newGVREF($2); }
	540	;
	541
	542	indirob : WORD
	543	{ $$ = scalar($1); }
	544	\| scalar
	545	{ $$ = scalar($1); }
	546	\| block
	547	{ $$ = scalar(scope($1)); }
	548
8d063cd8	549	;
8d063cd8	550
f0fcb552	551	crp : ',' ')'
	552	{ $$ = 1; }
	553	\| ')'
	554	{ $$ = 0; }
	555	;
	556
79072805	557	crb : ',' ']'
	558	{ $$ = 1; }
	559	\| ']'
	560	{ $$ = 0; }
	561	;
	562
	563	crhb : ',' ';' '}'
	564	{ $$ = 1; }
	565	\| ';' '}'
	566	{ $$ = 0; }
	567	;
450a55e4	568
8d063cd8	569	%% /* PROGRAM */