X-Git-Url: https://perl5.git.perl.org/perl5.git/blobdiff_plain/e334a159a5616cab575044bafaf68f75b7bb3a16..e92fe45ca3d43fcecf4a99c92c2f56c28510dc64:/perly.y diff --git a/perly.y b/perly.y index 0a1c2c9..c81cee3 100644 --- a/perly.y +++ b/perly.y @@ -1,870 +1,795 @@ -/* $RCSfile: perly.y,v $$Revision: 4.0.1.5 $$Date: 92/06/11 21:12:50 $ +/* perly.y * - * Copyright (c) 1991, Larry Wall + * Copyright (c) 1991-2002, 2003, 2004 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 4.0.1.5 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 "INTERN.h" -#include "perl.h" +/* + * '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.' + */ -/*SUPPRESS 530*/ -/*SUPPRESS 593*/ -/*SUPPRESS 595*/ +/* 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 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. + */ -STAB *scrstab; -ARG *arg4; /* rarely used arguments to make_op() */ -ARG *arg5; +/* Make the parser re-entrant. */ -%} +%pure_parser %start prog %union { - int ival; - char *cval; - ARG *arg; - CMD *cmdval; - struct compcmd compval; - STAB *stabval; - FCMD *formval; + I32 ival; + char *pval; + OP *opval; + GV *gvval; } -%token '{' ')' - -%token WORD LABEL -%token APPEND OPEN SSELECT LOOPEX DOTDOT -%token USING FORMAT DO SHIFT PUSH POP LVALFUN -%token WHILE UNTIL IF UNLESS ELSE ELSIF CONTINUE SPLIT FLIST -%token FOR FILOP FILOP2 FILOP3 FILOP4 FILOP22 FILOP25 -%token FUNC0 FUNC1 FUNC2 FUNC2x FUNC3 FUNC4 FUNC5 HSHFUN HSHFUN3 -%token FLIST2 SUB FILETEST LOCAL DELETE -%token RELOP EQOP MULOP ADDOP PACKAGE AMPER -%token FORMLIST -%token REG ARYLEN ARY HSH STAR -%token SUBST PATTERN -%token RSTRING TRANS - -%type prog decl format remember crp -%type block lineseq line loop cond sideff nexpr else -%type expr sexpr cexpr csexpr term handle aryword hshword -%type texpr listop bareword -%type label -%type compblock - -%nonassoc LISTOP +%token '{' + +%token WORD METHOD FUNCMETH THING PMFUNC PRIVATEREF +%token FUNC0SUB UNIOPSUB LSTOPSUB +%token LABEL +%token FORMAT SUB ANONSUB PACKAGE USE +%token WHILE UNTIL IF UNLESS ELSE ELSIF CONTINUE FOR +%token GIVEN WHEN DEFAULT +%token LOOPEX DOTDOT +%token FUNC0 FUNC1 FUNC UNIOP LSTOP +%token RELOP EQOP MULOP ADDOP +%token DOLSHARP DO HASHBRACK NOAMP +%token LOCAL MY MYSUB REQUIRE +%token COLONATTR + +%type prog decl format startsub startanonsub startformsub mintro +%type progstart remember mremember '&' savescope mydefsv +%type block mblock lineseq line loop cond else +%type expr term subscripted scalar ary hsh arylen star amper sideff +%type argexpr nexpr texpr iexpr mexpr mnexpr miexpr +%type listexpr listexprcom indirob listop method +%type formname subname proto subbody cont my_scalar +%type subattrlist myattrlist mysubrout myattrterm myterm +%type termbinop termunop anonymous termdo +%type switch case +%type label + +%nonassoc PREC_LOW +%nonassoc LOOPEX + +%left OROP DOROP +%left ANDOP +%right NOTOP +%nonassoc LSTOP LSTOPSUB %left ',' -%right '=' +%right ASSIGNOP %right '?' ':' %nonassoc DOTDOT -%left OROR +%left OROR DORDOR %left ANDAND -%left '|' '^' -%left '&' +%left BITOROP +%left BITANDOP %nonassoc EQOP %nonassoc RELOP -%nonassoc UNIOP -%nonassoc FILETEST -%left LS RS +%nonassoc UNIOP UNIOPSUB +%nonassoc REQUIRE +%left SHIFTOP %left ADDOP %left MULOP -%left MATCH NMATCH -%right '!' '~' UMINUS -%right POW -%nonassoc INC DEC +%left MATCHOP +%right '!' '~' UMINUS REFGEN +%right POWOP +%nonassoc PREINC PREDEC POSTINC POSTDEC +%left ARROW +%nonassoc ')' %left '(' +%left '[' '{' %% /* RULES */ -prog : /* NULL */ - { -#if defined(YYDEBUG) && defined(DEBUGGING) - yydebug = (debug & 1); -#endif - expectterm = 2; - } +/* The whole program */ +prog : progstart /*CONTINUED*/ lineseq - { if (in_eval) - eval_root = block_head($2); - else - main_root = block_head($2); } + { $$ = $1; newPROG(block_end($1,$2)); } ; -compblock: block CONTINUE block - { $$.comp_true = $1; $$.comp_alt = $3; } - | block else - { $$.comp_true = $1; $$.comp_alt = $2; } +/* An ordinary block */ +block : '{' remember lineseq '}' + { if (PL_copline > (line_t)$1) + PL_copline = (line_t)$1; + $$ = block_end($2, $3); } ; -else : /* NULL */ - { $$ = Nullcmd; } - | ELSE block - { $$ = $2; } - | ELSIF '(' expr ')' compblock - { cmdline = $1; - $$ = make_ccmd(C_ELSIF,1,$3,$5); } +remember: /* NULL */ /* start a full lexical scope */ + { $$ = block_start(TRUE); } ; -block : '{' remember lineseq '}' - { $$ = block_head($3); - if (cmdline > (line_t)$1) - cmdline = $1; - if (savestack->ary_fill > $2) - restorelist($2); - expectterm = 2; } +mydefsv: /* NULL */ /* lexicalize $_ */ + { $$ = (I32) allocmy("$_"); } ; -remember: /* NULL */ /* in case they push a package name */ - { $$ = savestack->ary_fill; } +progstart: + { + PL_expect = XSTATE; $$ = block_start(TRUE); + } + ; + + +mblock : '{' mremember lineseq '}' + { if (PL_copline > (line_t)$1) + PL_copline = (line_t)$1; + $$ = block_end($2, $3); } ; +mremember: /* NULL */ /* start a partial lexical scope */ + { $$ = block_start(FALSE); } + ; + +savescope: /* NULL */ /* remember stack pos in case of error */ + { $$ = PL_savestack_ix; } + +/* A collection of "lines" in the program */ lineseq : /* NULL */ - { $$ = Nullcmd; } - | lineseq line - { $$ = append_line($1,$2); } + { $$ = Nullop; } + | lineseq decl + { $$ = $1; } + | lineseq savescope line + { LEAVE_SCOPE($2); + $$ = append_list(OP_LINESEQ, + (LISTOP*)$1, (LISTOP*)$3); + PL_pad_reset_pending = TRUE; + if ($1 && $3) PL_hints |= HINT_BLOCK_SCOPE; } ; -line : decl - { $$ = Nullcmd; } - | label cond - { $$ = add_label($1,$2); } +/* A "line" in the program */ +line : label cond + { $$ = newSTATEOP(0, $1, $2); } | loop /* loops add their own labels */ + | switch /* ... and so do switches */ + { $$ = $1; } + | label case + { $$ = newSTATEOP(0, $1, $2); } | label ';' { if ($1 != Nullch) { - $$ = add_label($1, make_acmd(C_EXPR, Nullstab, - Nullarg, Nullarg) ); + $$ = newSTATEOP(0, $1, newOP(OP_NULL, 0)); } else { - $$ = Nullcmd; - cmdline = NOLINE; + $$ = Nullop; + PL_copline = NOLINE; } - expectterm = 2; } + PL_expect = XSTATE; } | label sideff ';' - { $$ = add_label($1,$2); - expectterm = 2; } + { $$ = newSTATEOP(0, $1, $2); + PL_expect = XSTATE; } ; +/* An expression which may have a side-effect */ sideff : error - { $$ = Nullcmd; } + { $$ = Nullop; } | expr - { $$ = make_acmd(C_EXPR, Nullstab, $1, Nullarg); } + { $$ = $1; } | expr IF expr - { $$ = addcond( - make_acmd(C_EXPR, Nullstab, Nullarg, $1), $3); } + { $$ = newLOGOP(OP_AND, 0, $3, $1); } | expr UNLESS expr - { $$ = addcond(invert( - make_acmd(C_EXPR, Nullstab, Nullarg, $1)), $3); } + { $$ = newLOGOP(OP_OR, 0, $3, $1); } | expr WHILE expr - { $$ = addloop( - make_acmd(C_EXPR, Nullstab, Nullarg, $1), $3); } - | expr UNTIL expr - { $$ = addloop(invert( - make_acmd(C_EXPR, Nullstab, Nullarg, $1)), $3); } - ; - -cond : IF '(' expr ')' compblock - { cmdline = $1; - $$ = make_icmd(C_IF,$3,$5); } - | UNLESS '(' expr ')' compblock - { cmdline = $1; - $$ = invert(make_icmd(C_IF,$3,$5)); } - | IF block compblock - { cmdline = $1; - $$ = make_icmd(C_IF,cmd_to_arg($2),$3); } - | UNLESS block compblock - { cmdline = $1; - $$ = invert(make_icmd(C_IF,cmd_to_arg($2),$3)); } - ; - -loop : label WHILE '(' texpr ')' compblock - { cmdline = $2; - $$ = wopt(add_label($1, - make_ccmd(C_WHILE,1,$4,$6) )); } - | label UNTIL '(' expr ')' compblock - { cmdline = $2; - $$ = wopt(add_label($1, - invert(make_ccmd(C_WHILE,1,$4,$6)) )); } - | label WHILE block compblock - { cmdline = $2; - $$ = wopt(add_label($1, - make_ccmd(C_WHILE, 1, cmd_to_arg($3),$4) )); } - | label UNTIL block compblock - { cmdline = $2; - $$ = wopt(add_label($1, - invert(make_ccmd(C_WHILE,1,cmd_to_arg($3),$4)) )); } - | label FOR REG '(' expr crp compblock - { cmdline = $2; - /* - * The following gobbledygook catches EXPRs that - * aren't explicit array refs and translates - * foreach VAR (EXPR) { - * into - * @ary = EXPR; - * foreach VAR (@ary) { - * where @ary is a hidden array made by genstab(). - * (Note that @ary may become a local array if - * it is determined that it might be called - * recursively. See cmd_tosave().) - */ - if ($5->arg_type != O_ARRAY) { - scrstab = aadd(genstab()); - $$ = append_line( - make_acmd(C_EXPR, Nullstab, - l(make_op(O_ASSIGN,2, - listish(make_op(O_ARRAY, 1, - stab2arg(A_STAB,scrstab), - Nullarg,Nullarg )), - listish(make_list($5)), - Nullarg)), - Nullarg), - wopt(over($3,add_label($1, - make_ccmd(C_WHILE, 0, - make_op(O_ARRAY, 1, - stab2arg(A_STAB,scrstab), - Nullarg,Nullarg ), - $7))))); - $$->c_line = $2; - $$->c_head->c_line = $2; - } - else { - $$ = wopt(over($3,add_label($1, - make_ccmd(C_WHILE,1,$5,$7) ))); - } - } - | label FOR '(' expr crp compblock - { cmdline = $2; - if ($4->arg_type != O_ARRAY) { - scrstab = aadd(genstab()); - $$ = append_line( - make_acmd(C_EXPR, Nullstab, - l(make_op(O_ASSIGN,2, - listish(make_op(O_ARRAY, 1, - stab2arg(A_STAB,scrstab), - Nullarg,Nullarg )), - listish(make_list($4)), - Nullarg)), - Nullarg), - wopt(over(defstab,add_label($1, - make_ccmd(C_WHILE, 0, - make_op(O_ARRAY, 1, - stab2arg(A_STAB,scrstab), - Nullarg,Nullarg ), - $6))))); - $$->c_line = $2; - $$->c_head->c_line = $2; - } - else { /* lisp, anyone? */ - $$ = wopt(over(defstab,add_label($1, - make_ccmd(C_WHILE,1,$4,$6) ))); - } - } - | label FOR '(' nexpr ';' texpr ';' nexpr ')' block + { $$ = newLOOPOP(OPf_PARENS, 1, scalar($3), $1); } + | expr UNTIL iexpr + { $$ = newLOOPOP(OPf_PARENS, 1, $3, $1);} + | expr FOR expr + { $$ = newFOROP(0, Nullch, (line_t)$2, + Nullop, $3, $1, Nullop); } + ; + +/* else and elsif blocks */ +else : /* NULL */ + { $$ = Nullop; } + | ELSE mblock + { ($2)->op_flags |= OPf_PARENS; $$ = scope($2); } + | ELSIF '(' mexpr ')' mblock else + { PL_copline = (line_t)$1; + $$ = newCONDOP(0, $3, scope($5), $6); + PL_hints |= HINT_BLOCK_SCOPE; } + ; + +/* Real conditional expressions */ +cond : IF '(' remember mexpr ')' mblock else + { PL_copline = (line_t)$1; + $$ = block_end($3, + newCONDOP(0, $4, scope($6), $7)); } + | UNLESS '(' remember miexpr ')' mblock else + { PL_copline = (line_t)$1; + $$ = block_end($3, + newCONDOP(0, $4, scope($6), $7)); } + ; + +/* Cases for a switch statement */ +case : WHEN '(' remember mexpr ')' mblock + { $$ = block_end($3, + newWHENOP($4, scope($6))); } + | DEFAULT block + { $$ = newWHENOP(0, scope($2)); } + ; + +/* Continue blocks */ +cont : /* NULL */ + { $$ = Nullop; } + | CONTINUE block + { $$ = scope($2); } + ; + +/* Loops: while, until, for, and a bare block */ +loop : label WHILE '(' remember texpr ')' mintro mblock cont + { PL_copline = (line_t)$2; + $$ = block_end($4, + newSTATEOP(0, $1, + newWHILEOP(0, 1, (LOOP*)Nullop, + $2, $5, $8, $9, $7))); } + | label UNTIL '(' remember iexpr ')' mintro mblock cont + { PL_copline = (line_t)$2; + $$ = block_end($4, + newSTATEOP(0, $1, + newWHILEOP(0, 1, (LOOP*)Nullop, + $2, $5, $8, $9, $7))); } + | label FOR MY remember my_scalar '(' mexpr ')' mblock cont + { $$ = block_end($4, + newFOROP(0, $1, (line_t)$2, $5, $7, $9, $10)); } + | label FOR scalar '(' remember mexpr ')' mblock cont + { $$ = block_end($5, + newFOROP(0, $1, (line_t)$2, mod($3, OP_ENTERLOOP), + $6, $8, $9)); } + | label FOR '(' remember mexpr ')' mblock cont + { $$ = block_end($4, + newFOROP(0, $1, (line_t)$2, Nullop, $5, $7, $8)); } + | label FOR '(' remember mnexpr ';' texpr ';' mintro mnexpr ')' + mblock /* basically fake up an initialize-while lineseq */ - { yyval.compval.comp_true = $10; - yyval.compval.comp_alt = $8; - cmdline = $2; - $$ = append_line($4,wopt(add_label($1, - make_ccmd(C_WHILE,1,$6,yyval.compval) ))); } - | label compblock /* a block is a loop that happens once */ - { $$ = add_label($1,make_ccmd(C_BLOCK,1,Nullarg,$2)); } + { OP *forop; + PL_copline = (line_t)$2; + forop = newSTATEOP(0, $1, + newWHILEOP(0, 1, (LOOP*)Nullop, + $2, scalar($7), + $12, $10, $9)); + if ($5) { + forop = append_elem(OP_LINESEQ, + newSTATEOP(0, ($1?savepv($1):Nullch), + $5), + forop); + } + + $$ = block_end($4, forop); } + | label block cont /* a block is a loop that happens once */ + { $$ = newSTATEOP(0, $1, + newWHILEOP(0, 1, (LOOP*)Nullop, + NOLINE, Nullop, $2, $3, 0)); } + ; + +/* Switch blocks */ +switch : label GIVEN '(' remember mydefsv mexpr ')' mblock + { PL_copline = (line_t) $2; + $$ = block_end($4, + newSTATEOP(0, $1, + newGIVENOP($6, scope($8), + (PADOFFSET) $5) )); } ; +/* determine whether there are any new my declarations */ +mintro : /* NULL */ + { $$ = (PL_min_intro_pending && + PL_max_intro_pending >= PL_min_intro_pending); + intro_my(); } + +/* Normal expression */ nexpr : /* NULL */ - { $$ = Nullcmd; } + { $$ = Nullop; } | sideff ; +/* Boolean expression */ texpr : /* NULL means true */ - { (void)scanstr("1",SCAN_DEF); $$ = yylval.arg; } + { (void)scan_num("1", &yylval); $$ = yylval.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(); } + ; + +/* Optional "MAIN:"-style loop labels */ label : /* empty */ { $$ = Nullch; } | LABEL ; +/* Some kind of declaration - does not take part in the parse tree */ decl : format { $$ = 0; } | subrout { $$ = 0; } + | mysubrout + { $$ = 0; } | package { $$ = 0; } + | use + { $$ = 0; } ; -format : FORMAT WORD '=' FORMLIST - { if (strEQ($2,"stdout")) - make_form(stabent("STDOUT",TRUE),$4); - else if (strEQ($2,"stderr")) - make_form(stabent("STDERR",TRUE),$4); - else - make_form(stabent($2,TRUE),$4); - Safefree($2); $2 = Nullch; } - | FORMAT '=' FORMLIST - { make_form(stabent("STDOUT",TRUE),$3); } +format : FORMAT startformsub formname block + { newFORM($2, $3, $4); } ; -subrout : SUB WORD block - { make_sub($2,$3); - cmdline = NOLINE; - if (savestack->ary_fill > $1) - restorelist($1); } +formname: WORD { $$ = $1; } + | /* NULL */ { $$ = Nullop; } ; -package : PACKAGE WORD ';' - { char tmpbuf[256]; - STAB *tmpstab; - - savehptr(&curstash); - saveitem(curstname); - str_set(curstname,$2); - sprintf(tmpbuf,"'_%s",$2); - tmpstab = stabent(tmpbuf,TRUE); - if (!stab_xhash(tmpstab)) - stab_xhash(tmpstab) = hnew(0); - curstash = stab_xhash(tmpstab); - if (!curstash->tbl_name) - curstash->tbl_name = savestr($2); - curstash->tbl_coeffsize = 0; - Safefree($2); $2 = Nullch; - cmdline = NOLINE; - expectterm = 2; - } - ; - -cexpr : ',' expr - { $$ = $2; } +/* Unimplemented "my sub foo { }" */ +mysubrout: MYSUB startsub subname proto subattrlist subbody + { newMYSUB($2, $3, $4, $5, $6); } + ; + +/* Subroutine definition */ +subrout : SUB startsub subname proto subattrlist subbody + { newATTRSUB($2, $3, $4, $5, $6); } + ; + +startsub: /* NULL */ /* start a regular subroutine scope */ + { $$ = start_subparse(FALSE, 0); } + ; + +startanonsub: /* NULL */ /* start an anonymous subroutine scope */ + { $$ = start_subparse(FALSE, CVf_ANON); } + ; + +startformsub: /* NULL */ /* start a format subroutine scope */ + { $$ = start_subparse(TRUE, 0); } + ; + +/* Name of a subroutine - must be a bareword, could be special */ +subname : WORD { const char *const name = SvPV_nolen_const(((SVOP*)$1)->op_sv); + if (strEQ(name, "BEGIN") || strEQ(name, "END") + || strEQ(name, "INIT") || strEQ(name, "CHECK")) + CvSPECIAL_on(PL_compcv); + $$ = $1; } + ; + +/* Subroutine prototype */ +proto : /* NULL */ + { $$ = Nullop; } + | THING ; -expr : expr ',' sexpr - { $$ = make_op(O_COMMA, 2, $1, $3, Nullarg); } - | sexpr +/* Optional list of subroutine attributes */ +subattrlist: /* NULL */ + { $$ = Nullop; } + | COLONATTR THING + { $$ = $2; } + | COLONATTR + { $$ = Nullop; } ; -csexpr : ',' sexpr +/* List of attributes for a "my" variable declaration */ +myattrlist: COLONATTR THING { $$ = $2; } + | COLONATTR + { $$ = Nullop; } + ; + +/* Subroutine body - either null or a block */ +subbody : block { $$ = $1; } + | ';' { $$ = Nullop; PL_expect = XSTATE; } + ; + +package : PACKAGE WORD ';' + { package($2); } + ; + +use : USE startsub + { CvSPECIAL_on(PL_compcv); /* It's a BEGIN {} */ } + WORD WORD listexpr ';' + { utilize($1, $2, $4, $5, $6); } ; -sexpr : sexpr '=' sexpr - { $1 = listish($1); - if ($1->arg_type == O_ASSIGN && $1->arg_len == 1) - $1->arg_type = O_ITEM; /* a local() */ - if ($1->arg_type == O_LIST) - $3 = listish($3); - $$ = l(make_op(O_ASSIGN, 2, $1, $3, Nullarg)); } - | sexpr POW '=' sexpr - { $$ = l(make_op(O_POW, 2, $1, $4, Nullarg)); } - | sexpr MULOP '=' sexpr - { $$ = l(make_op($2, 2, $1, $4, Nullarg)); } - | sexpr ADDOP '=' sexpr - { $$ = rcatmaybe(l(make_op($2, 2, $1, $4, Nullarg)));} - | sexpr LS '=' sexpr - { $$ = l(make_op(O_LEFT_SHIFT, 2, $1, $4, Nullarg)); } - | sexpr RS '=' sexpr - { $$ = l(make_op(O_RIGHT_SHIFT, 2, $1, $4, Nullarg)); } - | sexpr '&' '=' sexpr - { $$ = l(make_op(O_BIT_AND, 2, $1, $4, Nullarg)); } - | sexpr '^' '=' sexpr - { $$ = l(make_op(O_XOR, 2, $1, $4, Nullarg)); } - | sexpr '|' '=' sexpr - { $$ = l(make_op(O_BIT_OR, 2, $1, $4, Nullarg)); } - - - | sexpr POW sexpr - { $$ = make_op(O_POW, 2, $1, $3, Nullarg); } - | sexpr MULOP sexpr - { if ($2 == O_REPEAT) - $1 = listish($1); - $$ = make_op($2, 2, $1, $3, Nullarg); - if ($2 == O_REPEAT) { - if ($$[1].arg_type != A_EXPR || - $$[1].arg_ptr.arg_arg->arg_type != O_LIST) - $$[1].arg_flags &= ~AF_ARYOK; - } } - | sexpr ADDOP sexpr - { $$ = make_op($2, 2, $1, $3, Nullarg); } - | sexpr LS sexpr - { $$ = make_op(O_LEFT_SHIFT, 2, $1, $3, Nullarg); } - | sexpr RS sexpr - { $$ = make_op(O_RIGHT_SHIFT, 2, $1, $3, Nullarg); } - | sexpr RELOP sexpr - { $$ = make_op($2, 2, $1, $3, Nullarg); } - | sexpr EQOP sexpr - { $$ = make_op($2, 2, $1, $3, Nullarg); } - | sexpr '&' sexpr - { $$ = make_op(O_BIT_AND, 2, $1, $3, Nullarg); } - | sexpr '^' sexpr - { $$ = make_op(O_XOR, 2, $1, $3, Nullarg); } - | sexpr '|' sexpr - { $$ = make_op(O_BIT_OR, 2, $1, $3, Nullarg); } - | sexpr DOTDOT sexpr - { arg4 = Nullarg; - $$ = make_op(O_F_OR_R, 4, $1, $3, Nullarg); - $$[0].arg_flags |= $2; } - | sexpr ANDAND sexpr - { $$ = make_op(O_AND, 2, $1, $3, Nullarg); } - | sexpr OROR sexpr - { $$ = make_op(O_OR, 2, $1, $3, Nullarg); } - | sexpr '?' sexpr ':' sexpr - { $$ = make_op(O_COND_EXPR, 3, $1, $3, $5); } - | sexpr MATCH sexpr - { $$ = mod_match(O_MATCH, $1, $3); } - | sexpr NMATCH sexpr - { $$ = mod_match(O_NMATCH, $1, $3); } - | term +/* Ordinary expressions; logical combinations */ +expr : expr ANDOP expr + { $$ = newLOGOP(OP_AND, 0, $1, $3); } + | expr OROP expr + { $$ = newLOGOP($2, 0, $1, $3); } + | expr DOROP expr + { $$ = newLOGOP(OP_DOR, 0, $1, $3); } + | argexpr %prec PREC_LOW + ; + +/* Expressions are a list of terms joined by commas */ +argexpr : argexpr ',' { $$ = $1; } + | argexpr ',' term + { $$ = append_elem(OP_LIST, $1, $3); } + | term %prec PREC_LOW + ; + +/* List operators */ +listop : LSTOP indirob argexpr /* map {...} @args or print $fh @args */ + { $$ = convert($1, OPf_STACKED, + prepend_elem(OP_LIST, newGVREF($1,$2), $3) ); } + | FUNC '(' indirob expr ')' /* print ($fh @args */ + { $$ = convert($1, OPf_STACKED, + prepend_elem(OP_LIST, newGVREF($1,$3), $4) ); } + | term ARROW method '(' listexprcom ')' /* $foo->bar(list) */ + { $$ = convert(OP_ENTERSUB, OPf_STACKED, + append_elem(OP_LIST, + prepend_elem(OP_LIST, scalar($1), $5), + newUNOP(OP_METHOD, 0, $3))); } + | term ARROW method /* $foo->bar */ + { $$ = convert(OP_ENTERSUB, OPf_STACKED, + append_elem(OP_LIST, scalar($1), + newUNOP(OP_METHOD, 0, $3))); } + | METHOD indirob listexpr /* new Class @args */ + { $$ = convert(OP_ENTERSUB, OPf_STACKED, + append_elem(OP_LIST, + prepend_elem(OP_LIST, $2, $3), + newUNOP(OP_METHOD, 0, $1))); } + | FUNCMETH indirob '(' listexprcom ')' /* method $object (@args) */ + { $$ = convert(OP_ENTERSUB, OPf_STACKED, + append_elem(OP_LIST, + prepend_elem(OP_LIST, $2, $4), + newUNOP(OP_METHOD, 0, $1))); } + | LSTOP listexpr /* print @args */ + { $$ = convert($1, 0, $2); } + | FUNC '(' listexprcom ')' /* print (@args) */ + { $$ = convert($1, 0, $3); } + | LSTOPSUB startanonsub block /* sub f(&@); f { foo } ... */ + { $3 = newANONATTRSUB($2, 0, Nullop, $3); } + listexpr %prec LSTOP /* ... @bar */ + { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, + append_elem(OP_LIST, + prepend_elem(OP_LIST, $3, $5), $1)); } ; -term : '-' term %prec UMINUS - { $$ = make_op(O_NEGATE, 1, $2, Nullarg, Nullarg); } - | '+' term %prec UMINUS +/* Names of methods. May use $object->$methodname */ +method : METHOD + | scalar + ; + +/* Some kind of subscripted expression */ +subscripted: star '{' expr ';' '}' /* *main::{something} */ + /* In this and all the hash accessors, ';' is + * provided by the tokeniser */ + { $$ = newBINOP(OP_GELEM, 0, $1, scalar($3)); + PL_expect = XOPERATOR; } + | scalar '[' expr ']' /* $array[$element] */ + { $$ = newBINOP(OP_AELEM, 0, oopsAV($1), scalar($3)); } + | term ARROW '[' expr ']' /* somearef->[$element] */ + { $$ = newBINOP(OP_AELEM, 0, + ref(newAVREF($1),OP_RV2AV), + scalar($4));} + | subscripted '[' expr ']' /* $foo->[$bar]->[$baz] */ + { $$ = newBINOP(OP_AELEM, 0, + ref(newAVREF($1),OP_RV2AV), + scalar($3));} + | scalar '{' expr ';' '}' /* $foo->{bar();} */ + { $$ = newBINOP(OP_HELEM, 0, oopsHV($1), jmaybe($3)); + PL_expect = XOPERATOR; } + | term ARROW '{' expr ';' '}' /* somehref->{bar();} */ + { $$ = newBINOP(OP_HELEM, 0, + ref(newHVREF($1),OP_RV2HV), + jmaybe($4)); + PL_expect = XOPERATOR; } + | subscripted '{' expr ';' '}' /* $foo->[bar]->{baz;} */ + { $$ = newBINOP(OP_HELEM, 0, + ref(newHVREF($1),OP_RV2HV), + jmaybe($3)); + PL_expect = XOPERATOR; } + | term ARROW '(' ')' /* $subref->() */ + { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, + newCVREF(0, scalar($1))); } + | term ARROW '(' expr ')' /* $subref->(@args) */ + { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, + append_elem(OP_LIST, $4, + newCVREF(0, scalar($1)))); } + + | subscripted '(' expr ')' /* $foo->{bar}->(@args) */ + { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, + append_elem(OP_LIST, $3, + newCVREF(0, scalar($1)))); } + | subscripted '(' ')' /* $foo->{bar}->() */ + { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, + newCVREF(0, scalar($1))); } + | '(' expr ')' '[' expr ']' /* list slice */ + { $$ = newSLICEOP(0, $5, $2); } + | '(' ')' '[' expr ']' /* empty list slice! */ + { $$ = newSLICEOP(0, $4, Nullop); } + ; + +/* Binary operators between terms */ +termbinop : term ASSIGNOP term /* $x = $y */ + { $$ = newASSIGNOP(OPf_STACKED, $1, $2, $3); } + | term POWOP term /* $x ** $y */ + { $$ = newBINOP($2, 0, scalar($1), scalar($3)); } + | term MULOP term /* $x * $y, $x x $y */ + { if ($2 != OP_REPEAT) + scalar($1); + $$ = newBINOP($2, 0, $1, scalar($3)); } + | term ADDOP term /* $x + $y */ + { $$ = newBINOP($2, 0, scalar($1), scalar($3)); } + | term SHIFTOP term /* $x >> $y, $x << $y */ + { $$ = newBINOP($2, 0, scalar($1), scalar($3)); } + | term RELOP term /* $x > $y, etc. */ + { $$ = newBINOP($2, 0, scalar($1), scalar($3)); } + | term EQOP term /* $x == $y, $x eq $y */ + { $$ = newBINOP($2, 0, scalar($1), scalar($3)); } + | term BITANDOP term /* $x & $y */ + { $$ = newBINOP($2, 0, scalar($1), scalar($3)); } + | term BITOROP term /* $x | $y */ + { $$ = newBINOP($2, 0, scalar($1), scalar($3)); } + | term DOTDOT term /* $x..$y, $x...$y */ + { $$ = newRANGE($2, scalar($1), scalar($3));} + | term ANDAND term /* $x && $y */ + { $$ = newLOGOP(OP_AND, 0, $1, $3); } + | term OROR term /* $x || $y */ + { $$ = newLOGOP(OP_OR, 0, $1, $3); } + | term DORDOR term /* $x // $y */ + { $$ = newLOGOP(OP_DOR, 0, $1, $3); } + | term MATCHOP term /* $x =~ /$y/ */ + { $$ = bind_match($2, $1, $3); } + ; + +/* Unary operators and terms */ +termunop : '-' term %prec UMINUS /* -$x */ + { $$ = newUNOP(OP_NEGATE, 0, scalar($2)); } + | '+' term %prec UMINUS /* +$x */ { $$ = $2; } - | '!' term - { $$ = make_op(O_NOT, 1, $2, Nullarg, Nullarg); } - | '~' term - { $$ = make_op(O_COMPLEMENT, 1, $2, Nullarg, Nullarg);} - | term INC - { $$ = addflags(1, AF_POST|AF_UP, - l(make_op(O_ITEM,1,$1,Nullarg,Nullarg))); } - | term DEC - { $$ = addflags(1, AF_POST, - l(make_op(O_ITEM,1,$1,Nullarg,Nullarg))); } - | INC term - { $$ = addflags(1, AF_PRE|AF_UP, - l(make_op(O_ITEM,1,$2,Nullarg,Nullarg))); } - | DEC term - { $$ = addflags(1, AF_PRE, - l(make_op(O_ITEM,1,$2,Nullarg,Nullarg))); } - | FILETEST WORD - { opargs[$1] = 0; /* force it special */ - $$ = make_op($1, 1, - stab2arg(A_STAB,stabent($2,TRUE)), - Nullarg, Nullarg); - Safefree($2); $2 = Nullch; - } - | FILETEST sexpr - { opargs[$1] = 1; - $$ = make_op($1, 1, $2, Nullarg, Nullarg); } - | FILETEST - { opargs[$1] = ($1 != O_FTTTY); - $$ = make_op($1, 1, - stab2arg(A_STAB, - $1 == O_FTTTY?stabent("STDIN",TRUE):defstab), - Nullarg, Nullarg); } - | LOCAL '(' expr crp - { $$ = l(localize(make_op(O_ASSIGN, 1, - localize(listish(make_list($3))), - Nullarg,Nullarg))); } - | '(' expr crp - { $$ = make_list($2); } + | '!' term /* !$x */ + { $$ = newUNOP(OP_NOT, 0, scalar($2)); } + | '~' term /* ~$x */ + { $$ = newUNOP(OP_COMPLEMENT, 0, scalar($2));} + | term POSTINC /* $x++ */ + { $$ = newUNOP(OP_POSTINC, 0, + mod(scalar($1), OP_POSTINC)); } + | term POSTDEC /* $x-- */ + { $$ = newUNOP(OP_POSTDEC, 0, + mod(scalar($1), OP_POSTDEC)); } + | PREINC term /* ++$x */ + { $$ = newUNOP(OP_PREINC, 0, + mod(scalar($2), OP_PREINC)); } + | PREDEC term /* --$x */ + { $$ = newUNOP(OP_PREDEC, 0, + mod(scalar($2), OP_PREDEC)); } + + ; + +/* Constructors for anonymous data */ +anonymous: '[' expr ']' + { $$ = newANONLIST($2); } + | '[' ']' + { $$ = newANONLIST(Nullop); } + | HASHBRACK expr ';' '}' %prec '(' /* { foo => "Bar" } */ + { $$ = newANONHASH($2); } + | HASHBRACK ';' '}' %prec '(' /* { } (';' by tokener) */ + { $$ = newANONHASH(Nullop); } + | ANONSUB startanonsub proto subattrlist block %prec '(' + { $$ = newANONATTRSUB($2, $3, $4, $5); } + + ; + +/* Things called with "do" */ +termdo : DO term %prec UNIOP /* do $filename */ + { $$ = dofile($2, $1); } + | DO block %prec '(' /* do { code */ + { $$ = newUNOP(OP_NULL, OPf_SPECIAL, scope($2)); } + | DO WORD '(' ')' /* do somesub() */ + { $$ = newUNOP(OP_ENTERSUB, + OPf_SPECIAL|OPf_STACKED, + prepend_elem(OP_LIST, + scalar(newCVREF( + (OPpENTERSUB_AMPER<<8), + scalar($2) + )),Nullop)); dep();} + | DO WORD '(' expr ')' /* do somesub(@args) */ + { $$ = newUNOP(OP_ENTERSUB, + OPf_SPECIAL|OPf_STACKED, + append_elem(OP_LIST, + $4, + scalar(newCVREF( + (OPpENTERSUB_AMPER<<8), + scalar($2) + )))); dep();} + | DO scalar '(' ')' /* do $subref () */ + { $$ = newUNOP(OP_ENTERSUB, OPf_SPECIAL|OPf_STACKED, + prepend_elem(OP_LIST, + scalar(newCVREF(0,scalar($2))), Nullop)); dep();} + | DO scalar '(' expr ')' /* do $subref (@args) */ + { $$ = newUNOP(OP_ENTERSUB, OPf_SPECIAL|OPf_STACKED, + prepend_elem(OP_LIST, + $4, + scalar(newCVREF(0,scalar($2))))); dep();} + + ; + +term : termbinop + | termunop + | anonymous + | termdo + | term '?' term ':' term + { $$ = newCONDOP(0, $1, $3, $5); } + | REFGEN term /* \$x, \@y, \%z */ + { $$ = newUNOP(OP_REFGEN, 0, mod($2,OP_REFGEN)); } + | myattrterm %prec UNIOP + { $$ = $1; } + | LOCAL term %prec UNIOP + { $$ = localize($2,$1); } + | '(' expr ')' + { $$ = sawparens($2); } | '(' ')' - { $$ = make_list(Nullarg); } - | DO sexpr %prec FILETEST - { $$ = make_op(O_DOFILE,2,$2,Nullarg,Nullarg); - allstabs = TRUE;} - | DO block %prec '(' - { $$ = cmd_to_arg($2); } - | REG %prec '(' - { $$ = stab2arg(A_STAB,$1); } - | STAR %prec '(' - { $$ = stab2arg(A_STAR,$1); } - | REG '[' expr ']' %prec '(' - { $$ = make_op(O_AELEM, 2, - stab2arg(A_STAB,aadd($1)), $3, Nullarg); } - | HSH %prec '(' - { $$ = make_op(O_HASH, 1, - stab2arg(A_STAB,$1), - Nullarg, Nullarg); } - | ARY %prec '(' - { $$ = make_op(O_ARRAY, 1, - stab2arg(A_STAB,$1), - Nullarg, Nullarg); } - | REG '{' expr ';' '}' %prec '(' - { $$ = make_op(O_HELEM, 2, - stab2arg(A_STAB,hadd($1)), - jmaybe($3), - Nullarg); - expectterm = FALSE; } - | '(' expr crp '[' expr ']' %prec '(' - { $$ = make_op(O_LSLICE, 3, - Nullarg, - listish(make_list($5)), - listish(make_list($2))); } - | '(' ')' '[' expr ']' %prec '(' - { $$ = make_op(O_LSLICE, 3, - Nullarg, - listish(make_list($4)), - Nullarg); } - | ARY '[' expr ']' %prec '(' - { $$ = make_op(O_ASLICE, 2, - stab2arg(A_STAB,aadd($1)), - listish(make_list($3)), - Nullarg); } - | ARY '{' expr ';' '}' %prec '(' - { $$ = make_op(O_HSLICE, 2, - stab2arg(A_STAB,hadd($1)), - listish(make_list($3)), - Nullarg); - expectterm = FALSE; } - | DELETE REG '{' expr ';' '}' %prec '(' - { $$ = make_op(O_DELETE, 2, - stab2arg(A_STAB,hadd($2)), - jmaybe($4), - Nullarg); - expectterm = FALSE; } - | DELETE '(' REG '{' expr ';' '}' ')' %prec '(' - { $$ = make_op(O_DELETE, 2, - stab2arg(A_STAB,hadd($3)), - jmaybe($5), - Nullarg); - expectterm = FALSE; } - | ARYLEN %prec '(' - { $$ = stab2arg(A_ARYLEN,$1); } - | RSTRING %prec '(' + { $$ = sawparens(newNULLLIST()); } + | scalar %prec '(' { $$ = $1; } - | PATTERN %prec '(' + | star %prec '(' { $$ = $1; } - | SUBST %prec '(' + | hsh %prec '(' { $$ = $1; } - | TRANS %prec '(' + | ary %prec '(' { $$ = $1; } - | DO WORD '(' expr crp - { $$ = make_op((perldb ? O_DBSUBR : O_SUBR), 2, - stab2arg(A_WORD,stabent($2,MULTI)), - make_list($4), - Nullarg); Safefree($2); $2 = Nullch; - $$->arg_flags |= AF_DEPR; } - | AMPER WORD '(' expr crp - { $$ = make_op((perldb ? O_DBSUBR : O_SUBR), 2, - stab2arg(A_WORD,stabent($2,MULTI)), - make_list($4), - Nullarg); Safefree($2); $2 = Nullch; } - | DO WORD '(' ')' - { $$ = make_op((perldb ? O_DBSUBR : O_SUBR), 2, - stab2arg(A_WORD,stabent($2,MULTI)), - make_list(Nullarg), - Nullarg); - Safefree($2); $2 = Nullch; - $$->arg_flags |= AF_DEPR; } - | AMPER WORD '(' ')' - { $$ = make_op((perldb ? O_DBSUBR : O_SUBR), 2, - stab2arg(A_WORD,stabent($2,MULTI)), - make_list(Nullarg), - Nullarg); - Safefree($2); $2 = Nullch; - } - | AMPER WORD - { $$ = make_op((perldb ? O_DBSUBR : O_SUBR), 2, - stab2arg(A_WORD,stabent($2,MULTI)), - Nullarg, - Nullarg); - Safefree($2); $2 = Nullch; - } - | DO REG '(' expr crp - { $$ = make_op((perldb ? O_DBSUBR : O_SUBR), 2, - stab2arg(A_STAB,$2), - make_list($4), - Nullarg); - $$->arg_flags |= AF_DEPR; } - | AMPER REG '(' expr crp - { $$ = make_op((perldb ? O_DBSUBR : O_SUBR), 2, - stab2arg(A_STAB,$2), - make_list($4), - Nullarg); } - | DO REG '(' ')' - { $$ = make_op((perldb ? O_DBSUBR : O_SUBR), 2, - stab2arg(A_STAB,$2), - make_list(Nullarg), - Nullarg); - $$->arg_flags |= AF_DEPR; } - | AMPER REG '(' ')' - { $$ = make_op((perldb ? O_DBSUBR : O_SUBR), 2, - stab2arg(A_STAB,$2), - make_list(Nullarg), - Nullarg); } - | AMPER REG - { $$ = make_op((perldb ? O_DBSUBR : O_SUBR), 2, - stab2arg(A_STAB,$2), - Nullarg, - Nullarg); } - | LOOPEX - { $$ = make_op($1,0,Nullarg,Nullarg,Nullarg); } - | LOOPEX WORD - { $$ = make_op($1,1,cval_to_arg($2), - Nullarg,Nullarg); } - | UNIOP - { $$ = make_op($1,0,Nullarg,Nullarg,Nullarg); } - | UNIOP block - { $$ = make_op($1,1,cmd_to_arg($2),Nullarg,Nullarg); } - | UNIOP sexpr - { $$ = make_op($1,1,$2,Nullarg,Nullarg); } - | SSELECT - { $$ = make_op(O_SELECT, 0, Nullarg, Nullarg, Nullarg);} - | SSELECT WORD - { $$ = make_op(O_SELECT, 1, - stab2arg(A_WORD,stabent($2,TRUE)), - Nullarg, - Nullarg); - Safefree($2); $2 = Nullch; } - | SSELECT '(' handle ')' - { $$ = make_op(O_SELECT, 1, $3, Nullarg, Nullarg); } - | SSELECT '(' sexpr csexpr csexpr csexpr ')' - { arg4 = $6; - $$ = make_op(O_SSELECT, 4, $3, $4, $5); } - | OPEN WORD %prec '(' - { $$ = make_op(O_OPEN, 2, - stab2arg(A_WORD,stabent($2,TRUE)), - stab2arg(A_STAB,stabent($2,TRUE)), - Nullarg); - Safefree($2); $2 = Nullch; - } - | OPEN '(' WORD ')' - { $$ = make_op(O_OPEN, 2, - stab2arg(A_WORD,stabent($3,TRUE)), - stab2arg(A_STAB,stabent($3,TRUE)), - Nullarg); - Safefree($3); $3 = Nullch; - } - | OPEN '(' handle cexpr ')' - { $$ = make_op(O_OPEN, 2, - $3, - $4, Nullarg); } - | FILOP '(' handle ')' - { $$ = make_op($1, 1, - $3, - Nullarg, Nullarg); } - | FILOP WORD - { $$ = make_op($1, 1, - stab2arg(A_WORD,stabent($2,TRUE)), - Nullarg, Nullarg); - Safefree($2); $2 = Nullch; } - | FILOP REG - { $$ = make_op($1, 1, - stab2arg(A_STAB,$2), - Nullarg, Nullarg); } - | FILOP '(' ')' - { $$ = make_op($1, 1, - stab2arg(A_WORD,Nullstab), - Nullarg, Nullarg); } - | FILOP %prec '(' - { $$ = make_op($1, 0, - Nullarg, Nullarg, Nullarg); } - | FILOP2 '(' handle cexpr ')' - { $$ = make_op($1, 2, $3, $4, Nullarg); } - | FILOP3 '(' handle csexpr cexpr ')' - { $$ = make_op($1, 3, $3, $4, make_list($5)); } - | FILOP22 '(' handle ',' handle ')' - { $$ = make_op($1, 2, $3, $5, Nullarg); } - | FILOP4 '(' handle csexpr csexpr cexpr ')' - { arg4 = $6; $$ = make_op($1, 4, $3, $4, $5); } - | FILOP25 '(' handle ',' handle csexpr csexpr cexpr ')' - { arg4 = $7; arg5 = $8; - $$ = make_op($1, 5, $3, $5, $6); } - | PUSH '(' aryword ',' expr crp - { $$ = make_op($1, 2, - $3, - make_list($5), - Nullarg); } - | POP aryword %prec '(' - { $$ = make_op(O_POP, 1, $2, Nullarg, Nullarg); } - | POP '(' aryword ')' - { $$ = make_op(O_POP, 1, $3, Nullarg, Nullarg); } - | SHIFT aryword %prec '(' - { $$ = make_op(O_SHIFT, 1, $2, Nullarg, Nullarg); } - | SHIFT '(' aryword ')' - { $$ = make_op(O_SHIFT, 1, $3, Nullarg, Nullarg); } - | SHIFT %prec '(' - { $$ = make_op(O_SHIFT, 1, - stab2arg(A_STAB, - aadd(stabent(subline ? "_" : "ARGV", TRUE))), - Nullarg, Nullarg); } - | SPLIT %prec '(' - { static char p[]="/\\s+/"; - char *oldend = bufend; - ARG *oldarg = yylval.arg; - - bufend=p+5; - (void)scanpat(p); - bufend=oldend; - $$ = make_split(defstab,yylval.arg,Nullarg); - yylval.arg = oldarg; } - | SPLIT '(' sexpr csexpr csexpr ')' - { $$ = mod_match(O_MATCH, $4, - make_split(defstab,$3,$5));} - | SPLIT '(' sexpr csexpr ')' - { $$ = mod_match(O_MATCH, $4, - make_split(defstab,$3,Nullarg) ); } - | SPLIT '(' sexpr ')' - { $$ = mod_match(O_MATCH, - stab2arg(A_STAB,defstab), - make_split(defstab,$3,Nullarg) ); } - | FLIST2 '(' sexpr cexpr ')' - { $$ = make_op($1, 2, - $3, - listish(make_list($4)), - Nullarg); } - | FLIST '(' expr crp - { $$ = make_op($1, 1, - make_list($3), - Nullarg, - Nullarg); } - | LVALFUN sexpr %prec '(' - { $$ = l(make_op($1, 1, fixl($1,$2), - Nullarg, Nullarg)); } - | LVALFUN - { $$ = l(make_op($1, 1, - stab2arg(A_STAB,defstab), - Nullarg, Nullarg)); } - | FUNC0 - { $$ = make_op($1, 0, Nullarg, Nullarg, Nullarg); } + | arylen %prec '(' /* $#x, $#{ something } */ + { $$ = newUNOP(OP_AV2ARYLEN, 0, ref($1, OP_AV2ARYLEN));} + | subscripted + { $$ = $1; } + | ary '[' expr ']' /* array slice */ + { $$ = prepend_elem(OP_ASLICE, + newOP(OP_PUSHMARK, 0), + newLISTOP(OP_ASLICE, 0, + list($3), + ref($1, OP_ASLICE))); } + | ary '{' expr ';' '}' /* @hash{@keys} */ + { $$ = prepend_elem(OP_HSLICE, + newOP(OP_PUSHMARK, 0), + newLISTOP(OP_HSLICE, 0, + list($3), + ref(oopsHV($1), OP_HSLICE))); + PL_expect = XOPERATOR; } + | THING %prec '(' + { $$ = $1; } + | amper /* &foo; */ + { $$ = newUNOP(OP_ENTERSUB, 0, scalar($1)); } + | amper '(' ')' /* &foo() */ + { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, scalar($1)); } + | amper '(' expr ')' /* &foo(@args) */ + { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, + append_elem(OP_LIST, $3, scalar($1))); } + | NOAMP WORD listexpr /* foo(@args) */ + { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, + append_elem(OP_LIST, $3, scalar($2))); } + | LOOPEX /* loop exiting command (goto, last, dump, etc) */ + { $$ = newOP($1, OPf_SPECIAL); + PL_hints |= HINT_BLOCK_SCOPE; } + | LOOPEX term + { $$ = newLOOPEX($1,$2); } + | NOTOP argexpr /* not $foo */ + { $$ = newUNOP(OP_NOT, 0, scalar($2)); } + | UNIOP /* Unary op, $_ implied */ + { $$ = newOP($1, 0); } + | UNIOP block /* eval { foo } */ + { $$ = newUNOP($1, 0, $2); } + | UNIOP term /* Unary op */ + { $$ = newUNOP($1, 0, $2); } + | REQUIRE /* require, $_ implied */ + { $$ = newOP(OP_REQUIRE, $1 ? OPf_SPECIAL : 0); } + | REQUIRE term /* require Foo */ + { $$ = newUNOP(OP_REQUIRE, $1 ? OPf_SPECIAL : 0, $2); } + | UNIOPSUB term /* Sub treated as unop */ + { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, + append_elem(OP_LIST, $2, scalar($1))); } + | FUNC0 /* Nullary operator */ + { $$ = newOP($1, 0); } | FUNC0 '(' ')' - { $$ = make_op($1, 0, Nullarg, Nullarg, Nullarg); } - | FUNC1 '(' ')' - { $$ = make_op($1, 0, Nullarg, Nullarg, Nullarg); } - | FUNC1 '(' expr ')' - { $$ = make_op($1, 1, $3, Nullarg, Nullarg); } - | FUNC2 '(' sexpr cexpr ')' - { $$ = make_op($1, 2, $3, $4, Nullarg); - if ($1 == O_INDEX && $$[2].arg_type == A_SINGLE) - fbmcompile($$[2].arg_ptr.arg_str,0); } - | FUNC2x '(' sexpr csexpr ')' - { $$ = make_op($1, 2, $3, $4, Nullarg); - if ($1 == O_INDEX && $$[2].arg_type == A_SINGLE) - fbmcompile($$[2].arg_ptr.arg_str,0); } - | FUNC2x '(' sexpr csexpr cexpr ')' - { $$ = make_op($1, 3, $3, $4, $5); - if ($1 == O_INDEX && $$[2].arg_type == A_SINGLE) - fbmcompile($$[2].arg_ptr.arg_str,0); } - | FUNC3 '(' sexpr csexpr cexpr ')' - { $$ = make_op($1, 3, $3, $4, $5); } - | FUNC4 '(' sexpr csexpr csexpr cexpr ')' - { arg4 = $6; - $$ = make_op($1, 4, $3, $4, $5); } - | FUNC5 '(' sexpr csexpr csexpr csexpr cexpr ')' - { arg4 = $6; arg5 = $7; - $$ = make_op($1, 5, $3, $4, $5); } - | HSHFUN '(' hshword ')' - { $$ = make_op($1, 1, - $3, - Nullarg, - Nullarg); } - | HSHFUN hshword - { $$ = make_op($1, 1, - $2, - Nullarg, - Nullarg); } - | HSHFUN3 '(' hshword csexpr cexpr ')' - { $$ = make_op($1, 3, $3, $4, $5); } - | bareword + { $$ = newOP($1, 0); } + | FUNC0SUB /* Sub treated as nullop */ + { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, + scalar($1)); } + | FUNC1 '(' ')' /* not () */ + { $$ = $1 == OP_NOT ? newUNOP($1, 0, newSVOP(OP_CONST, 0, newSViv(0))) + : newOP($1, OPf_SPECIAL); } + | FUNC1 '(' expr ')' /* not($foo) */ + { $$ = newUNOP($1, 0, $3); } + | PMFUNC '(' argexpr ')' /* m//, s///, tr/// */ + { $$ = pmruntime($1, $3, 1); } + | WORD | listop ; -listop : LISTOP - { $$ = make_op($1,2, - stab2arg(A_WORD,Nullstab), - stab2arg(A_STAB,defstab), - Nullarg); } - | LISTOP expr - { $$ = make_op($1,2, - stab2arg(A_WORD,Nullstab), - maybelistish($1,make_list($2)), - Nullarg); } - | LISTOP WORD - { $$ = make_op($1,2, - stab2arg(A_WORD,stabent($2,TRUE)), - stab2arg(A_STAB,defstab), - Nullarg); - Safefree($2); $2 = Nullch; - } - | LISTOP WORD expr - { $$ = make_op($1,2, - stab2arg(A_WORD,stabent($2,TRUE)), - maybelistish($1,make_list($3)), - Nullarg); Safefree($2); $2 = Nullch; } - | LISTOP REG expr - { $$ = make_op($1,2, - stab2arg(A_STAB,$2), - maybelistish($1,make_list($3)), - Nullarg); } - | LISTOP block expr - { $$ = make_op($1,2, - cmd_to_arg($2), - maybelistish($1,make_list($3)), - Nullarg); } - ; - -handle : WORD - { $$ = stab2arg(A_WORD,stabent($1,TRUE)); - Safefree($1); $1 = Nullch;} - | sexpr - ; - -aryword : WORD - { $$ = stab2arg(A_WORD,aadd(stabent($1,TRUE))); - Safefree($1); $1 = Nullch; } - | ARY - { $$ = stab2arg(A_STAB,$1); } - ; - -hshword : WORD - { $$ = stab2arg(A_WORD,hadd(stabent($1,TRUE))); - Safefree($1); $1 = Nullch; } - | HSH - { $$ = stab2arg(A_STAB,$1); } - ; - -crp : ',' ')' - { $$ = 1; } - | ')' - { $$ = 0; } +/* "my" declarations, with optional attributes */ +myattrterm: MY myterm myattrlist + { $$ = my_attrs($2,$3); } + | MY myterm + { $$ = localize($2,$1); } ; -/* - * NOTE: The following entry must stay at the end of the file so that - * reduce/reduce conflicts resolve to it only if it's the only option. - */ +/* Things that can be "my"'d */ +myterm : '(' expr ')' + { $$ = sawparens($2); } + | '(' ')' + { $$ = sawparens(newNULLLIST()); } + | scalar %prec '(' + { $$ = $1; } + | hsh %prec '(' + { $$ = $1; } + | ary %prec '(' + { $$ = $1; } + ; + +/* Basic list expressions */ +listexpr: /* NULL */ %prec PREC_LOW + { $$ = Nullop; } + | argexpr %prec PREC_LOW + { $$ = $1; } + ; + +listexprcom: /* NULL */ + { $$ = Nullop; } + | expr + { $$ = $1; } + | expr ',' + { $$ = $1; } + ; + +/* A little bit of trickery to make "for my $foo (@bar)" actually be + lexical */ +my_scalar: scalar + { PL_in_my = 0; $$ = my($1); } + ; + +amper : '&' indirob + { $$ = newCVREF($1,$2); } + ; + +scalar : '$' indirob + { $$ = newSVREF($2); } + ; + +ary : '@' indirob + { $$ = newAVREF($2); } + ; + +hsh : '%' indirob + { $$ = newHVREF($2); } + ; -bareword: WORD - { char *s; - $$ = op_new(1); - $$->arg_type = O_ITEM; - $$[1].arg_type = A_SINGLE; - $$[1].arg_ptr.arg_str = str_make($1,0); - for (s = $1; *s && isLOWER(*s); s++) ; - if (dowarn && !*s) - warn( - "\"%s\" may clash with future reserved word", - $1 ); - Safefree($1); $1 = Nullch; - } - ; -%% /* PROGRAM */ +arylen : DOLSHARP indirob + { $$ = newAVREF($2); } + ; + +star : '*' indirob + { $$ = newGVREF(0,$2); } + ; + +/* Indirect objects */ +indirob : WORD + { $$ = scalar($1); } + | scalar %prec PREC_LOW + { $$ = scalar($1); } + | block + { $$ = scope($1); } + + | PRIVATEREF + { $$ = $1; } + ;