/* perly.y
*
- * Copyright (c) 1991-1994, Larry Wall
+ * 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 that wander are lost.'
+ * 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"]
*/
-%{
-#include "EXTERN.h"
-#include "perl.h"
+/*
+ * 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.
+ *
+ * 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 $n variables within
+ * an action.
+ */
-static void
-dep()
-{
- deprecate("\"do\" to call subroutines");
-}
+/* Make the parser re-entrant. */
-%}
+%pure_parser
-%start prog
+%start grammar
%union {
- I32 ival;
+ I32 ival; /* __DEFAULT__ (marker for regen_perly.pl;
+ must always be 1st union member) */
char *pval;
OP *opval;
GV *gvval;
}
-%token <ival> '{' ')'
+%token <ival> GRAMPROG GRAMEXPR GRAMBLOCK GRAMBARESTMT GRAMFULLSTMT GRAMSTMTSEQ
-%token <opval> WORD METHOD FUNCMETH THING PMFUNC PRIVATEREF
-%token <opval> FUNC0SUB UNIOPSUB LSTOPSUB
+%token <ival> '{' '}' '[' ']' '-' '+' '$' '@' '%' '*' '&' ';' '=' '.'
+
+%token <opval> WORD METHOD FUNCMETH THING PMFUNC PRIVATEREF QWLIST
+%token <opval> FUNC0OP FUNC0SUB UNIOPSUB LSTOPSUB
+%token <opval> PLUGEXPR PLUGSTMT
%token <pval> LABEL
%token <ival> FORMAT SUB ANONSUB PACKAGE USE
%token <ival> WHILE UNTIL IF UNLESS ELSE ELSIF CONTINUE FOR
-%token <ival> LOOPEX DOTDOT
-%token <ival> FUNC0 FUNC1 FUNC
+%token <ival> GIVEN WHEN DEFAULT
+%token <ival> LOOPEX DOTDOT YADAYADA
+%token <ival> FUNC0 FUNC1 FUNC UNIOP LSTOP
%token <ival> RELOP EQOP MULOP ADDOP
%token <ival> DOLSHARP DO HASHBRACK NOAMP
-%token LOCAL MY
-
-%type <ival> prog decl local format startsub remember mremember '&'
-%type <opval> block mblock mintro lineseq line loop cond else
-%type <opval> expr term scalar ary hsh arylen star amper sideff
-%type <opval> argexpr nexpr texpr iexpr mexpr mtexpr miexpr
-%type <opval> listexpr listexprcom indirob
-%type <opval> listop method proto cont my_scalar
-%type <pval> label
-
-%left <ival> OROP
-%left ANDOP
-%right NOTOP
-%nonassoc <ival> LSTOP
-%left ','
+%token <ival> LOCAL MY REQUIRE
+%token <ival> COLONATTR FORMLBRACK FORMRBRACK
+
+%type <ival> grammar remember mremember
+%type <ival> startsub startanonsub startformsub
+
+%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 optsubbody cont my_scalar formblock
+%type <opval> subattrlist myattrlist myattrterm myterm
+%type <opval> realsubbody subsignature termbinop termunop anonymous termdo
+%type <opval> formstmtseq formline formarg
+
+%nonassoc <ival> PREC_LOW
+%nonassoc LOOPEX
+
+%left <ival> OROP DOROP
+%left <ival> ANDOP
+%right <ival> NOTOP
+%nonassoc LSTOP LSTOPSUB
+%left <ival> ','
%right <ival> ASSIGNOP
-%right '?' ':'
-%nonassoc DOTDOT
-%left OROR
-%left ANDAND
+%right <ival> '?' ':'
+%nonassoc DOTDOT YADAYADA
+%left <ival> OROR DORDOR
+%left <ival> ANDAND
%left <ival> BITOROP
%left <ival> BITANDOP
%nonassoc EQOP
%nonassoc RELOP
-%nonassoc <ival> UNIOP
+%nonassoc UNIOP UNIOPSUB
+%nonassoc REQUIRE
%left <ival> SHIFTOP
%left ADDOP
%left MULOP
%left <ival> MATCHOP
-%right '!' '~' UMINUS REFGEN
+%right <ival> '!' '~' UMINUS REFGEN
%right <ival> POWOP
-%nonassoc PREINC PREDEC POSTINC POSTDEC
-%left ARROW
-%left '('
+%nonassoc <ival> PREINC PREDEC POSTINC POSTDEC POSTJOIN
+%left <ival> ARROW
+%nonassoc <ival> ')'
+%left <ival> '('
+%left '[' '{'
%% /* RULES */
-prog : /* NULL */
- {
-#if defined(YYDEBUG) && defined(DEBUGGING)
- yydebug = (debug & 1);
-#endif
- expect = XSTATE;
- }
- /*CONTINUED*/ lineseq
- { newPROG($2); }
+/* Top-level choice of what kind of thing yyparse was called to parse */
+grammar : GRAMPROG
+ {
+ 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;
+ }
;
-block : '{' remember lineseq '}'
- { $$ = block_end($1,$2,$3); }
+/* An ordinary block */
+block : '{' remember stmtseq '}'
+ { if (parser->copline > (line_t)$1)
+ parser->copline = (line_t)$1;
+ $$ = block_end($2, $3);
+ }
;
-remember: /* NULL */ /* start a full lexical scope */
- { $$ = block_start(TRUE); }
+/* format body */
+formblock: '=' remember ';' FORMRBRACK formstmtseq ';' '.'
+ { if (parser->copline > (line_t)$1)
+ parser->copline = (line_t)$1;
+ $$ = block_end($2, $5);
+ }
;
-mblock : '{' mintro mremember lineseq '}'
- { if ($2)
- $4 = $4 ? append_list(OP_LINESEQ,
- (LISTOP*)$2, (LISTOP*)$4) : $2;
- $$ = block_end($1, $3, $4); }
+remember: /* NULL */ /* start a full lexical scope */
+ { $$ = block_start(TRUE); }
;
-mintro : /* NULL */ /* introduce pending lexicals */
- { $$ = min_intro_pending
- ? newSTATEOP(0, Nullch, newOP(OP_NULL, 0))
- : NULL; }
+mblock : '{' mremember stmtseq '}'
+ { if (parser->copline > (line_t)$1)
+ parser->copline = (line_t)$1;
+ $$ = block_end($2, $3);
+ }
;
mremember: /* NULL */ /* start a partial lexical scope */
{ $$ = block_start(FALSE); }
;
-lineseq : /* NULL */
- { $$ = Nullop; }
- | lineseq decl
+/* 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
+ {
+ $$ = $1 ? newSTATEOP(0, NULL, $1) : NULL;
+ }
+ | labfullstmt
+ { $$ = $1; }
+ ;
+
+labfullstmt: LABEL barestmt
+ {
+ $$ = newSTATEOP(SVf_UTF8 * $1[strlen($1)+1], $1, $2);
+ }
+ | LABEL labfullstmt
+ {
+ $$ = newSTATEOP(SVf_UTF8 * $1[strlen($1)+1], $1, $2);
+ }
+ ;
+
+/* A bare statement, lacking label and other aspects of state op */
+barestmt: PLUGSTMT
{ $$ = $1; }
- | lineseq line
- { $$ = append_list(OP_LINESEQ,
- (LISTOP*)$1, (LISTOP*)$2);
- pad_reset_pending = TRUE;
- if ($1 && $2) hints |= HINT_BLOCK_SCOPE; }
- ;
-
-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 {
- $$ = Nullop;
- copline = NOLINE;
- }
- expect = XSTATE; }
- | label sideff ';'
- { $$ = newSTATEOP(0, $1, $2);
- expect = XSTATE; }
+ | FORMAT startformsub formname formblock
+ {
+ CV *fmtcv = PL_compcv;
+ newFORM($2, $3, $4);
+ $$ = (OP*)NULL;
+ if (CvOUTSIDE(fmtcv) && !CvEVAL(CvOUTSIDE(fmtcv))) {
+ SvREFCNT_inc_simple_void(fmtcv);
+ pad_add_anon(fmtcv, OP_NULL);
+ }
+ }
+ | SUB subname startsub
+ {
+ if ($2->op_type == OP_CONST) {
+ const char *const name =
+ SvPV_nolen_const(((SVOP*)$2)->op_sv);
+ if (strEQ(name, "BEGIN") || strEQ(name, "END")
+ || strEQ(name, "INIT") || strEQ(name, "CHECK")
+ || strEQ(name, "UNITCHECK"))
+ CvSPECIAL_on(PL_compcv);
+ }
+ else
+ /* State subs inside anonymous subs need to be
+ clonable themselves. */
+ if (CvANON(CvOUTSIDE(PL_compcv))
+ || CvCLONE(CvOUTSIDE(PL_compcv))
+ || !PadnameIsSTATE(PadlistNAMESARRAY(CvPADLIST(
+ CvOUTSIDE(PL_compcv)
+ ))[$2->op_targ]))
+ CvCLONE_on(PL_compcv);
+ parser->in_my = 0;
+ parser->in_my_stash = NULL;
+ }
+ proto subattrlist optsubbody
+ {
+ SvREFCNT_inc_simple_void(PL_compcv);
+ $2->op_type == OP_CONST
+ ? newATTRSUB($3, $2, $5, $6, $7)
+ : newMYSUB($3, $2, $5, $6, $7)
+ ;
+ $$ = (OP*)NULL;
+ intro_my();
+ }
+ | PACKAGE WORD WORD ';'
+ {
+ package($3);
+ if ($2)
+ package_version($2);
+ $$ = (OP*)NULL;
+ }
+ | USE startsub
+ { CvSPECIAL_on(PL_compcv); /* It's a BEGIN {} */ }
+ WORD WORD optlistexpr ';'
+ {
+ SvREFCNT_inc_simple_void(PL_compcv);
+ utilize($1, $2, $4, $5, $6);
+ $$ = (OP*)NULL;
+ }
+ | IF '(' remember mexpr ')' mblock else
+ {
+ $$ = block_end($3,
+ newCONDOP(0, $4, op_scope($6), $7));
+ parser->copline = (line_t)$1;
+ }
+ | UNLESS '(' remember miexpr ')' mblock else
+ {
+ $$ = block_end($3,
+ newCONDOP(0, $4, op_scope($6), $7));
+ parser->copline = (line_t)$1;
+ }
+ | GIVEN '(' remember mexpr ')' mblock
+ {
+ const PADOFFSET offset = pad_findmy_pvs("$_", 0);
+ $$ = block_end($3,
+ newGIVENOP($4, op_scope($6),
+ offset == NOT_IN_PAD
+ || PAD_COMPNAME_FLAGS_isOUR(offset)
+ ? 0
+ : offset));
+ parser->copline = (line_t)$1;
+ }
+ | WHEN '(' remember mexpr ')' mblock
+ { $$ = 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));
+ parser->copline = (line_t)$1;
+ }
+ | UNTIL '(' remember iexpr ')' mintro mblock cont
+ {
+ $$ = block_end($3,
+ newWHILEOP(0, 1, (LOOP*)(OP*)NULL,
+ $4, $7, $8, $6));
+ parser->copline = (line_t)$1;
+ }
+ | FOR '(' remember mnexpr ';'
+ { parser->expect = XTERM; }
+ texpr ';'
+ { parser->expect = XTERM; }
+ mintro mnexpr ')'
+ mblock
+ {
+ OP *initop = $4;
+ OP *forop = newWHILEOP(0, 1, (LOOP*)(OP*)NULL,
+ scalar($7), $13, $11, $10);
+ if (initop) {
+ forop = op_prepend_elem(OP_LINESEQ, initop,
+ op_append_elem(OP_LINESEQ,
+ newOP(OP_UNSTACK, OPf_SPECIAL),
+ forop));
+ }
+ $$ = block_end($3, forop);
+ parser->copline = (line_t)$1;
+ }
+ | FOR MY remember my_scalar '(' mexpr ')' mblock cont
+ {
+ $$ = block_end($3, newFOROP(0, $4, $6, $8, $9));
+ parser->copline = (line_t)$1;
+ }
+ | FOR scalar '(' remember mexpr ')' mblock cont
+ {
+ $$ = block_end($4, newFOROP(0,
+ op_lvalue($2, OP_ENTERLOOP), $5, $7, $8));
+ parser->copline = (line_t)$1;
+ }
+ | FOR '(' remember mexpr ')' mblock cont
+ {
+ $$ = block_end($3,
+ newFOROP(0, (OP*)NULL, $4, $6, $7));
+ parser->copline = (line_t)$1;
+ }
+ | block cont
+ {
+ /* a block is a loop that happens once */
+ $$ = 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 */
+ $$ = newWHILEOP(0, 1, (LOOP*)(OP*)NULL,
+ (OP*)NULL, block_end($5, $7), (OP*)NULL, 0);
+ if (parser->copline > (line_t)$4)
+ parser->copline = (line_t)$4;
+ }
+ | sideff ';'
+ {
+ $$ = $1;
+ }
+ | ';'
+ {
+ $$ = (OP*)NULL;
+ parser->copline = NOLINE;
+ }
+ ;
+
+/* Format line */
+formline: THING formarg
+ { OP *list;
+ if ($2) {
+ OP *term = $2;
+ list = op_append_elem(OP_LIST, $1, term);
+ }
+ else {
+ list = $1;
+ }
+ if (parser->copline == NOLINE)
+ parser->copline = CopLINE(PL_curcop)-1;
+ else parser->copline--;
+ $$ = 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
- { $$ = Nullop; }
+ { $$ = (OP*)NULL; }
| expr
{ $$ = $1; }
| expr IF expr
| expr WHILE expr
{ $$ = newLOOPOP(OPf_PARENS, 1, scalar($3), $1); }
| expr UNTIL iexpr
- { $$ = newLOOPOP(OPf_PARENS, 1, $3, $1);}
+ { $$ = newLOOPOP(OPf_PARENS, 1, $3, $1); }
+ | expr FOR expr
+ { $$ = newFOROP(0, (OP*)NULL, $3, $1, (OP*)NULL);
+ parser->copline = (line_t)$2; }
+ | expr WHEN expr
+ { $$ = newWHENOP($3, op_scope($1)); }
;
+/* else and elsif blocks */
else : /* NULL */
- { $$ = Nullop; }
+ { $$ = (OP*)NULL; }
| ELSE mblock
- { $$ = scope($2); }
+ {
+ ($2)->op_flags |= OPf_PARENS;
+ $$ = op_scope($2);
+ }
| ELSIF '(' mexpr ')' mblock else
- { copline = $1;
- $$ = newCONDOP(0, $3, scope($5), $6);
- hints |= HINT_BLOCK_SCOPE; }
- ;
-
-cond : IF '(' remember mexpr ')' mblock else
- { copline = $1;
- $$ = block_end($1, $3,
- newCONDOP(0, $4, scope($6), $7)); }
- | UNLESS '(' remember miexpr ')' mblock else
- { copline = $1;
- $$ = block_end($1, $3,
- newCONDOP(0, $4, scope($6), $7)); }
- | IF block block else
- { copline = $1;
- deprecate("if BLOCK BLOCK");
- $$ = newCONDOP(0, scope($2), scope($3), $4); }
- | UNLESS block block else
- { copline = $1;
- deprecate("unless BLOCK BLOCK");
- $$ = newCONDOP(0, invert(scalar(scope($2))),
- scope($3), $4); }
+ { parser->copline = (line_t)$1;
+ $$ = newCONDOP(0,
+ newSTATEOP(OPf_SPECIAL,NULL,$3),
+ op_scope($5), $6);
+ PL_hints |= HINT_BLOCK_SCOPE;
+ }
;
+/* Continue blocks */
cont : /* NULL */
- { $$ = Nullop; }
+ { $$ = (OP*)NULL; }
| CONTINUE block
- { $$ = scope($2); }
- ;
-
-loop : label WHILE '(' remember mtexpr ')' mblock cont
- { copline = $2;
- $$ = block_end($2, $4,
- newSTATEOP(0, $1,
- newWHILEOP(0, 1, (LOOP*)Nullop,
- $5, $7, $8) )); }
- | label UNTIL '(' remember miexpr ')' mblock cont
- { copline = $2;
- $$ = block_end($2, $4,
- newSTATEOP(0, $1,
- newWHILEOP(0, 1, (LOOP*)Nullop,
- $5, $7, $8) )); }
- | label WHILE block block cont
- { copline = $2;
- $$ = newSTATEOP(0, $1,
- newWHILEOP(0, 1, (LOOP*)Nullop,
- scope($3), $4, $5) ); }
- | label UNTIL block block cont
- { copline = $2;
- $$ = newSTATEOP(0, $1,
- newWHILEOP(0, 1, (LOOP*)Nullop,
- invert(scalar(scope($3))), $4, $5)); }
- | label FOR MY remember my_scalar '(' expr ')' mblock cont
- { $$ = block_end($2, $4,
- newFOROP(0, $1, $2, $5, $7, $9, $10)); }
- | label FOR scalar '(' expr ')' block cont
- { $$ = newFOROP(0, $1, $2, mod($3, OP_ENTERLOOP),
- $5, $7, $8); }
- | label FOR '(' remember expr ')' mblock cont
- { $$ = block_end($2, $4,
- newFOROP(0, $1, $2, Nullop, $5, $7, $8)); }
- | label FOR '(' remember nexpr ';'
- { if ($5) {
- $5 = scalar($5);
- if (min_intro_pending)
- $5 = newSTATEOP(0, Nullch, $5); } }
- texpr ';'
- { $8 = scalar($8);
- if (min_intro_pending)
- $8 = newSTATEOP(0, Nullch, $8); }
- nexpr ')' mblock
- /* basically fake up an initialize-while lineseq */
- { copline = $2;
- $$ = block_end($2, $4,
- append_elem(OP_LINESEQ, $5,
- newSTATEOP(0, $1,
- newWHILEOP(0, 1, (LOOP*)Nullop,
- $8, $13, scalar($11))))); }
- | label block cont /* a block is a loop that happens once */
- { $$ = newSTATEOP(0,
- $1, newWHILEOP(0, 1, (LOOP*)Nullop,
- Nullop, $2, $3)); }
+ { $$ = op_scope($2); }
;
+/* determine whether there are any new my declarations */
+mintro : /* NULL */
+ { $$ = (PL_min_intro_pending &&
+ PL_max_intro_pending >= PL_min_intro_pending);
+ intro_my(); }
+
+/* Normal expression */
nexpr : /* NULL */
- { $$ = Nullop; }
+ { $$ = (OP*)NULL; }
| sideff
;
+/* Boolean expression */
texpr : /* NULL means true */
- { (void)scan_num("1"); $$ = yylval.opval; }
+ { YYSTYPE tmplval;
+ (void)scan_num("1", &tmplval);
+ $$ = tmplval.opval; }
| expr
;
+/* Inverted boolean expression */
iexpr : expr
{ $$ = invert(scalar($1)); }
;
+/* Expression with its own lexical scope */
mexpr : expr
- { $$ = min_intro_pending
- ? newSTATEOP(0, Nullch, $1) : $1; }
+ { $$ = $1; intro_my(); }
;
-mtexpr : texpr
- { $$ = min_intro_pending
- ? newSTATEOP(0, Nullch, $1) : $1; }
+mnexpr : nexpr
+ { $$ = $1; intro_my(); }
;
miexpr : iexpr
- { $$ = min_intro_pending
- ? newSTATEOP(0, Nullch, $1) : $1; }
+ { $$ = $1; intro_my(); }
+ ;
+
+formname: WORD { $$ = $1; }
+ | /* NULL */ { $$ = (OP*)NULL; }
;
-label : /* empty */
- { $$ = Nullch; }
- | LABEL
+startsub: /* NULL */ /* start a regular subroutine scope */
+ { $$ = start_subparse(FALSE, 0);
+ SAVEFREESV(PL_compcv); }
+
;
-decl : format
- { $$ = 0; }
- | subrout
- { $$ = 0; }
- | package
- { $$ = 0; }
- | use
- { $$ = 0; }
+startanonsub: /* NULL */ /* start an anonymous subroutine scope */
+ { $$ = start_subparse(FALSE, CVf_ANON);
+ SAVEFREESV(PL_compcv); }
;
-format : FORMAT startsub WORD block
- { newFORM($2, $3, $4); }
- | FORMAT startsub block
- { newFORM($2, Nullop, $3); }
+startformsub: /* NULL */ /* start a format subroutine scope */
+ { $$ = start_subparse(TRUE, 0);
+ SAVEFREESV(PL_compcv); }
;
-subrout : SUB startsub WORD proto block
- { newSUB($2, $3, $4, $5); }
- | SUB startsub WORD proto ';'
- { newSUB($2, $3, $4, Nullop); expect = XSTATE; }
+/* Name of a subroutine - must be a bareword, could be special */
+subname : WORD
+ | PRIVATEREF
;
+/* Subroutine prototype */
proto : /* NULL */
- { $$ = Nullop; }
+ { $$ = (OP*)NULL; }
| THING
;
-
-startsub: /* NULL */ /* start a subroutine scope */
- { $$ = start_subparse(); }
+
+/* Optional list of subroutine attributes */
+subattrlist: /* NULL */
+ { $$ = (OP*)NULL; }
+ | COLONATTR THING
+ { $$ = $2; }
+ | COLONATTR
+ { $$ = (OP*)NULL; }
+ ;
+
+/* List of attributes for a "my" variable declaration */
+myattrlist: COLONATTR THING
+ { $$ = $2; }
+ | COLONATTR
+ { $$ = (OP*)NULL; }
+ ;
+
+/* Optional subroutine signature */
+subsignature: /* NULL */ { $$ = (OP*)NULL; }
+ | '('
+ {
+ if (!FEATURE_SIGNATURES_IS_ENABLED)
+ Perl_croak(aTHX_ "Experimental "
+ "subroutine signatures not enabled");
+ Perl_ck_warner_d(aTHX_
+ packWARN(WARN_EXPERIMENTAL__SIGNATURES),
+ "The signatures feature is experimental");
+ $<opval>$ = parse_subsignature();
+ }
+ ')'
+ {
+ $$ = op_append_list(OP_LINESEQ, $<opval>2,
+ newSTATEOP(0, NULL, sawparens(newNULLLIST())));
+ parser->expect = XBLOCK;
+ }
;
-package : PACKAGE WORD ';'
- { package($2); }
- | PACKAGE ';'
- { package(Nullop); }
+/* Subroutine body - block with optional signature */
+realsubbody: remember subsignature '{' stmtseq '}'
+ {
+ if (parser->copline > (line_t)$3)
+ parser->copline = (line_t)$3;
+ $$ = block_end($1,
+ op_append_list(OP_LINESEQ, $2, $4));
+ }
;
-use : USE startsub WORD WORD listexpr ';'
- { utilize($1, $2, $3, $4, $5); }
+/* Optional subroutine body, for named subroutine declaration */
+optsubbody: realsubbody { $$ = $1; }
+ | ';' { $$ = (OP*)NULL; }
;
+/* Ordinary expressions; logical combinations */
expr : expr ANDOP expr
{ $$ = newLOGOP(OP_AND, 0, $1, $3); }
| expr OROP expr
{ $$ = newLOGOP($2, 0, $1, $3); }
- | argexpr
+ | expr DOROP expr
+ { $$ = newLOGOP(OP_DOR, 0, $1, $3); }
+ | listexpr %prec PREC_LOW
;
-argexpr : argexpr ','
+/* Expressions are a list of terms joined by commas */
+listexpr: listexpr ','
{ $$ = $1; }
- | argexpr ',' term
- { $$ = append_elem(OP_LIST, $1, $3); }
- | term
+ | listexpr ',' term
+ {
+ OP* term = $3;
+ $$ = op_append_elem(OP_LIST, $1, term);
+ }
+ | term %prec PREC_LOW
;
-listop : LSTOP indirob argexpr
+/* List operators */
+listop : LSTOP indirob listexpr /* map {...} @args or print $fh @args */
{ $$ = convert($1, OPf_STACKED,
- prepend_elem(OP_LIST, newGVREF($1,$2), $3) ); }
- | FUNC '(' indirob expr ')'
+ op_prepend_elem(OP_LIST, newGVREF($1,$2), $3) );
+ }
+ | FUNC '(' indirob expr ')' /* print ($fh @args */
{ $$ = convert($1, OPf_STACKED,
- prepend_elem(OP_LIST, newGVREF($1,$3), $4) ); }
- | term ARROW method '(' listexprcom ')'
+ op_prepend_elem(OP_LIST, newGVREF($1,$3), $4) );
+ }
+ | term ARROW method '(' optexpr ')' /* $foo->bar(list) */
+ { $$ = convert(OP_ENTERSUB, OPf_STACKED,
+ op_append_elem(OP_LIST,
+ op_prepend_elem(OP_LIST, scalar($1), $5),
+ newUNOP(OP_METHOD, 0, $3)));
+ }
+ | term ARROW method /* $foo->bar */
{ $$ = convert(OP_ENTERSUB, OPf_STACKED,
- append_elem(OP_LIST,
- prepend_elem(OP_LIST, scalar($1), $5),
- newUNOP(OP_METHOD, 0, $3))); }
- | METHOD indirob listexpr
+ op_append_elem(OP_LIST, scalar($1),
+ newUNOP(OP_METHOD, 0, $3)));
+ }
+ | METHOD indirob optlistexpr /* new Class @args */
{ $$ = convert(OP_ENTERSUB, OPf_STACKED,
- append_elem(OP_LIST,
- prepend_elem(OP_LIST, $2, $3),
- newUNOP(OP_METHOD, 0, $1))); }
- | FUNCMETH indirob '(' listexprcom ')'
+ op_append_elem(OP_LIST,
+ op_prepend_elem(OP_LIST, $2, $3),
+ newUNOP(OP_METHOD, 0, $1)));
+ }
+ | FUNCMETH indirob '(' optexpr ')' /* method $object (@args) */
{ $$ = convert(OP_ENTERSUB, OPf_STACKED,
- append_elem(OP_LIST,
- prepend_elem(OP_LIST, $2, $4),
- newUNOP(OP_METHOD, 0, $1))); }
- | LSTOP listexpr
+ op_append_elem(OP_LIST,
+ op_prepend_elem(OP_LIST, $2, $4),
+ newUNOP(OP_METHOD, 0, $1)));
+ }
+ | LSTOP optlistexpr /* print @args */
{ $$ = convert($1, 0, $2); }
- | FUNC '(' listexprcom ')'
+ | FUNC '(' optexpr ')' /* print (@args) */
{ $$ = convert($1, 0, $3); }
- | LSTOPSUB startsub block listexpr %prec LSTOP
+ | LSTOPSUB startanonsub block /* sub f(&@); f { foo } ... */
+ { SvREFCNT_inc_simple_void(PL_compcv);
+ $<opval>$ = newANONATTRSUB($2, 0, (OP*)NULL, $3); }
+ optlistexpr %prec LSTOP /* ... @bar */
{ $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
- append_elem(OP_LIST,
- prepend_elem(OP_LIST, newANONSUB($2, 0, $3), $4),
- $1)); }
+ op_append_elem(OP_LIST,
+ op_prepend_elem(OP_LIST, $<opval>4, $5), $1));
+ }
;
+/* Names of methods. May use $object->$methodname */
method : METHOD
| scalar
;
-term : term ASSIGNOP term
+/* Some kind of subscripted expression */
+subscripted: gelem '{' expr ';' '}' /* *main::{something} */
+ /* In this and all the hash accessors, ';' is
+ * provided by the tokeniser */
+ { $$ = newBINOP(OP_GELEM, 0, $1, scalar($3)); }
+ | 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));
+ }
+ | term ARROW '{' expr ';' '}' /* somehref->{bar();} */
+ { $$ = newBINOP(OP_HELEM, 0,
+ ref(newHVREF($1),OP_RV2HV),
+ jmaybe($4)); }
+ | subscripted '{' expr ';' '}' /* $foo->[bar]->{baz;} */
+ { $$ = newBINOP(OP_HELEM, 0,
+ ref(newHVREF($1),OP_RV2HV),
+ jmaybe($3)); }
+ | term ARROW '(' ')' /* $subref->() */
+ { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
+ newCVREF(0, scalar($1))); }
+ | term ARROW '(' expr ')' /* $subref->(@args) */
+ { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
+ op_append_elem(OP_LIST, $4,
+ newCVREF(0, scalar($1)))); }
+
+ | subscripted '(' expr ')' /* $foo->{bar}->(@args) */
+ { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
+ op_append_elem(OP_LIST, $3,
+ newCVREF(0, scalar($1)))); }
+ | subscripted '(' ')' /* $foo->{bar}->() */
+ { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
+ newCVREF(0, scalar($1))); }
+ | '(' expr ')' '[' expr ']' /* list slice */
+ { $$ = newSLICEOP(0, $5, $2); }
+ | QWLIST '[' expr ']' /* list literal slice */
+ { $$ = newSLICEOP(0, $3, $1); }
+ | '(' ')' '[' expr ']' /* empty list slice! */
+ { $$ = newSLICEOP(0, $4, (OP*)NULL); }
+ ;
+
+/* Binary operators between terms */
+termbinop: term ASSIGNOP term /* $x = $y */
{ $$ = newASSIGNOP(OPf_STACKED, $1, $2, $3); }
- | term POWOP term
+ | term POWOP term /* $x ** $y */
{ $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
- | term MULOP term
+ | term MULOP term /* $x * $y, $x x $y */
{ if ($2 != OP_REPEAT)
scalar($1);
- $$ = newBINOP($2, 0, $1, scalar($3)); }
- | term ADDOP term
+ $$ = newBINOP($2, 0, $1, scalar($3));
+ }
+ | term ADDOP term /* $x + $y */
{ $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
- | term SHIFTOP term
+ | term SHIFTOP term /* $x >> $y, $x << $y */
{ $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
- | term RELOP term
+ | term RELOP term /* $x > $y, etc. */
{ $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
- | term EQOP term
+ | term EQOP term /* $x == $y, $x eq $y */
{ $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
- | term BITANDOP term
+ | term BITANDOP term /* $x & $y */
{ $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
- | term BITOROP term
+ | term BITOROP term /* $x | $y */
{ $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
- | term DOTDOT term
- { $$ = newRANGE($2, scalar($1), scalar($3));}
- | term ANDAND term
+ | 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
+ | term OROR term /* $x || $y */
{ $$ = newLOGOP(OP_OR, 0, $1, $3); }
- | term '?' term ':' term
- { $$ = newCONDOP(0, $1, $3, $5); }
- | term MATCHOP term
+ | term DORDOR term /* $x // $y */
+ { $$ = newLOGOP(OP_DOR, 0, $1, $3); }
+ | term MATCHOP term /* $x =~ /$y/ */
{ $$ = bind_match($2, $1, $3); }
+ ;
- | '-' term %prec UMINUS
+/* Unary operators and terms */
+termunop : '-' term %prec UMINUS /* -$x */
{ $$ = newUNOP(OP_NEGATE, 0, scalar($2)); }
- | '+' term %prec UMINUS
+ | '+' term %prec UMINUS /* +$x */
{ $$ = $2; }
- | '!' term
+
+ | '!' term /* !$x */
{ $$ = newUNOP(OP_NOT, 0, scalar($2)); }
- | '~' term
- { $$ = newUNOP(OP_COMPLEMENT, 0, scalar($2));}
- | REFGEN term
- { $$ = newUNOP(OP_REFGEN, 0, mod($2,OP_REFGEN)); }
- | term POSTINC
+ | '~' term /* ~$x */
+ { $$ = newUNOP(OP_COMPLEMENT, 0, scalar($2)); }
+ | term POSTINC /* $x++ */
{ $$ = newUNOP(OP_POSTINC, 0,
- mod(scalar($1), OP_POSTINC)); }
- | term POSTDEC
+ op_lvalue(scalar($1), OP_POSTINC)); }
+ | term POSTDEC /* $x-- */
{ $$ = newUNOP(OP_POSTDEC, 0,
- mod(scalar($1), OP_POSTDEC)); }
- | PREINC term
+ op_lvalue(scalar($1), OP_POSTDEC));}
+ | term POSTJOIN /* implicit join after interpolated ->@ */
+ { $$ = convert(OP_JOIN, 0,
+ op_append_elem(
+ OP_LIST,
+ newSVREF(scalar(
+ newSVOP(OP_CONST,0,
+ newSVpvs("\""))
+ )),
+ $1
+ ));
+ }
+ | PREINC term /* ++$x */
{ $$ = newUNOP(OP_PREINC, 0,
- mod(scalar($2), OP_PREINC)); }
- | PREDEC term
+ op_lvalue(scalar($2), OP_PREINC)); }
+ | PREDEC term /* --$x */
{ $$ = newUNOP(OP_PREDEC, 0,
- mod(scalar($2), OP_PREDEC)); }
- | local term %prec UNIOP
+ op_lvalue(scalar($2), OP_PREDEC)); }
+
+ ;
+
+/* Constructors for anonymous data */
+anonymous: '[' expr ']'
+ { $$ = newANONLIST($2); }
+ | '[' ']'
+ { $$ = newANONLIST((OP*)NULL);}
+ | HASHBRACK expr ';' '}' %prec '(' /* { foo => "Bar" } */
+ { $$ = newANONHASH($2); }
+ | HASHBRACK ';' '}' %prec '(' /* { } (';' by tokener) */
+ { $$ = newANONHASH((OP*)NULL); }
+ | ANONSUB startanonsub proto subattrlist realsubbody %prec '('
+ { SvREFCNT_inc_simple_void(PL_compcv);
+ $$ = 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, op_scope($2));}
+ ;
+
+term : termbinop
+ | termunop
+ | anonymous
+ | termdo
+ | term '?' term ':' term
+ { $$ = newCONDOP(0, $1, $3, $5); }
+ | REFGEN term /* \$x, \@y, \%z */
+ { $$ = newUNOP(OP_REFGEN, 0, op_lvalue($2,OP_REFGEN)); }
+ | myattrterm %prec UNIOP
+ { $$ = $1; }
+ | LOCAL term %prec UNIOP
{ $$ = localize($2,$1); }
| '(' expr ')'
{ $$ = sawparens($2); }
+ | QWLIST
+ { $$ = $1; }
| '(' ')'
{ $$ = sawparens(newNULLLIST()); }
- | '[' expr ']' %prec '('
- { $$ = newANONLIST($2); }
- | '[' ']' %prec '('
- { $$ = newANONLIST(Nullop); }
- | HASHBRACK expr ';' '}' %prec '('
- { $$ = newANONHASH($2); }
- | HASHBRACK ';' '}' %prec '('
- { $$ = newANONHASH(Nullop); }
- | ANONSUB startsub proto block %prec '('
- { $$ = newANONSUB($2, $3, $4); }
| scalar %prec '('
{ $$ = $1; }
- | star '{' expr ';' '}'
- { $$ = newBINOP(OP_GELEM, 0, newGVREF(0,$1), $3); }
| star %prec '('
{ $$ = $1; }
- | scalar '[' expr ']' %prec '('
- { $$ = newBINOP(OP_AELEM, 0, oopsAV($1), scalar($3)); }
- | term ARROW '[' expr ']' %prec '('
- { $$ = newBINOP(OP_AELEM, 0,
- ref(newAVREF($1),OP_RV2AV),
- scalar($4));}
- | term '[' expr ']' %prec '('
- { assertref($1); $$ = newBINOP(OP_AELEM, 0,
- ref(newAVREF($1),OP_RV2AV),
- scalar($3));}
| hsh %prec '('
{ $$ = $1; }
| ary %prec '('
{ $$ = $1; }
- | arylen %prec '('
+ | arylen %prec '(' /* $#x, $#{ something } */
{ $$ = newUNOP(OP_AV2ARYLEN, 0, ref($1, OP_AV2ARYLEN));}
- | scalar '{' expr ';' '}' %prec '('
- { $$ = newBINOP(OP_HELEM, 0, oopsHV($1), jmaybe($3));
- expect = XOPERATOR; }
- | term ARROW '{' expr ';' '}' %prec '('
- { $$ = newBINOP(OP_HELEM, 0,
- ref(newHVREF($1),OP_RV2HV),
- jmaybe($4));
- expect = XOPERATOR; }
- | term '{' expr ';' '}' %prec '('
- { assertref($1); $$ = newBINOP(OP_HELEM, 0,
- ref(newHVREF($1),OP_RV2HV),
- jmaybe($3));
- expect = XOPERATOR; }
- | '(' expr ')' '[' expr ']' %prec '('
- { $$ = newSLICEOP(0, $5, $2); }
- | '(' ')' '[' expr ']' %prec '('
- { $$ = newSLICEOP(0, $4, Nullop); }
- | ary '[' expr ']' %prec '('
- { $$ = prepend_elem(OP_ASLICE,
+ | subscripted
+ { $$ = $1; }
+ | sliceme '[' expr ']' /* array slice */
+ { $$ = op_prepend_elem(OP_ASLICE,
newOP(OP_PUSHMARK, 0),
newLISTOP(OP_ASLICE, 0,
list($3),
- ref($1, OP_ASLICE))); }
- | ary '{' expr ';' '}' %prec '('
- { $$ = prepend_elem(OP_HSLICE,
+ ref($1, OP_ASLICE)));
+ if ($$ && $1)
+ $$->op_private |=
+ $1->op_private & OPpSLICEWARNING;
+ }
+ | kvslice '[' expr ']' /* array key/value slice */
+ { $$ = op_prepend_elem(OP_KVASLICE,
+ newOP(OP_PUSHMARK, 0),
+ newLISTOP(OP_KVASLICE, 0,
+ list($3),
+ ref(oopsAV($1), OP_KVASLICE)));
+ if ($$ && $1)
+ $$->op_private |=
+ $1->op_private & OPpSLICEWARNING;
+ }
+ | sliceme '{' expr ';' '}' /* @hash{@keys} */
+ { $$ = op_prepend_elem(OP_HSLICE,
newOP(OP_PUSHMARK, 0),
newLISTOP(OP_HSLICE, 0,
list($3),
ref(oopsHV($1), OP_HSLICE)));
- expect = XOPERATOR; }
+ if ($$ && $1)
+ $$->op_private |=
+ $1->op_private & OPpSLICEWARNING;
+ }
+ | kvslice '{' expr ';' '}' /* %hash{@keys} */
+ { $$ = op_prepend_elem(OP_KVHSLICE,
+ newOP(OP_PUSHMARK, 0),
+ newLISTOP(OP_KVHSLICE, 0,
+ list($3),
+ ref($1, OP_KVHSLICE)));
+ if ($$ && $1)
+ $$->op_private |=
+ $1->op_private & OPpSLICEWARNING;
+ }
| THING %prec '('
{ $$ = $1; }
- | amper
+ | amper /* &foo; */
{ $$ = newUNOP(OP_ENTERSUB, 0, scalar($1)); }
- | amper '(' ')'
- { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, scalar($1)); }
- | amper '(' expr ')'
- { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
- append_elem(OP_LIST, $3, scalar($1))); }
- | NOAMP WORD listexpr
+ | amper '(' ')' /* &foo() or foo() */
+ { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, scalar($1));
+ }
+ | amper '(' expr ')' /* &foo(@args) or foo(@args) */
+ {
+ $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
+ op_append_elem(OP_LIST, $3, scalar($1)));
+ }
+ | NOAMP subname optlistexpr /* foo @args (no parens) */
{ $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
- append_elem(OP_LIST, $3, scalar($2))); }
- | DO term %prec UNIOP
- { $$ = newUNOP(OP_DOFILE, 0, scalar($2)); }
- | DO block %prec '('
- { $$ = newUNOP(OP_NULL, OPf_SPECIAL, scope($2)); }
- | DO WORD '(' ')'
- { $$ = newUNOP(OP_ENTERSUB,
- OPf_SPECIAL|OPf_STACKED,
- prepend_elem(OP_LIST,
- scalar(newCVREF(
- (OPpENTERSUB_AMPER<<8),
- scalar($2)
- )),Nullop)); dep();}
- | DO WORD '(' expr ')'
- { $$ = newUNOP(OP_ENTERSUB,
- OPf_SPECIAL|OPf_STACKED,
- append_elem(OP_LIST,
- $4,
- scalar(newCVREF(
- (OPpENTERSUB_AMPER<<8),
- scalar($2)
- )))); dep();}
- | DO scalar '(' ')'
- { $$ = newUNOP(OP_ENTERSUB, OPf_SPECIAL|OPf_STACKED,
- prepend_elem(OP_LIST,
- scalar(newCVREF(0,scalar($2))), Nullop)); dep();}
- | DO scalar '(' expr ')'
- { $$ = newUNOP(OP_ENTERSUB, OPf_SPECIAL|OPf_STACKED,
- prepend_elem(OP_LIST,
- $4,
- scalar(newCVREF(0,scalar($2))))); dep();}
- | LOOPEX
+ op_append_elem(OP_LIST, $3, scalar($2)));
+ }
+ | term ARROW '$' '*'
+ { $$ = newSVREF($1); }
+ | term ARROW '@' '*'
+ { $$ = newAVREF($1); }
+ | term ARROW '%' '*'
+ { $$ = newHVREF($1); }
+ | term ARROW '&' '*'
+ { $$ = newUNOP(OP_ENTERSUB, 0,
+ scalar(newCVREF($3,$1))); }
+ | term ARROW '*' '*' %prec '('
+ { $$ = newGVREF(0,$1); }
+ | LOOPEX /* loop exiting command (goto, last, dump, etc) */
{ $$ = newOP($1, OPf_SPECIAL);
- hints |= HINT_BLOCK_SCOPE; }
+ PL_hints |= HINT_BLOCK_SCOPE; }
| LOOPEX term
{ $$ = newLOOPEX($1,$2); }
- | NOTOP argexpr
+ | NOTOP listexpr /* not $foo */
{ $$ = newUNOP(OP_NOT, 0, scalar($2)); }
- | UNIOP
+ | UNIOP /* Unary op, $_ implied */
{ $$ = newOP($1, 0); }
- | UNIOP block
+ | UNIOP block /* eval { foo }* */
{ $$ = newUNOP($1, 0, $2); }
- | UNIOP term
+ | UNIOP term /* Unary op */
{ $$ = newUNOP($1, 0, $2); }
- | UNIOPSUB term
+ | REQUIRE /* require, $_ implied */
+ { $$ = newOP(OP_REQUIRE, $1 ? OPf_SPECIAL : 0); }
+ | REQUIRE term /* require Foo */
+ { $$ = newUNOP(OP_REQUIRE, $1 ? OPf_SPECIAL : 0, $2); }
+ | UNIOPSUB
+ { $$ = newUNOP(OP_ENTERSUB, OPf_STACKED, scalar($1)); }
+ | UNIOPSUB term /* Sub treated as unop */
{ $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
- append_elem(OP_LIST, $2, scalar($1))); }
- | FUNC0
+ op_append_elem(OP_LIST, $2, scalar($1))); }
+ | FUNC0 /* Nullary operator */
{ $$ = newOP($1, 0); }
| FUNC0 '(' ')'
- { $$ = newOP($1, 0); }
- | FUNC0SUB
- { $$ = newUNOP(OP_ENTERSUB, 0,
- scalar($1)); }
- | FUNC1 '(' ')'
- { $$ = newOP($1, OPf_SPECIAL); }
- | FUNC1 '(' expr ')'
+ { $$ = newOP($1, 0);}
+ | FUNC0OP /* Same as above, but op created in toke.c */
+ { $$ = $1; }
+ | FUNC0OP '(' ')'
+ { $$ = $1; }
+ | 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) */
{ $$ = newUNOP($1, 0, $3); }
- | PMFUNC '(' term ')'
- { $$ = pmruntime($1, $3, Nullop); }
- | PMFUNC '(' term ',' term ')'
- { $$ = pmruntime($1, $3, $5); }
+ | PMFUNC /* m//, s///, qr//, tr/// */
+ {
+ if ( $1->op_type != OP_TRANS
+ && $1->op_type != OP_TRANSR
+ && (((PMOP*)$1)->op_pmflags & PMf_HAS_CV))
+ {
+ $<ival>$ = start_subparse(FALSE, CVf_ANON);
+ SAVEFREESV(PL_compcv);
+ } else
+ $<ival>$ = 0;
+ }
+ '(' listexpr ')'
+ { $$ = pmruntime($1, $4, 1, $<ival>2); }
| WORD
| listop
+ | YADAYADA
+ {
+ $$ = newLISTOP(OP_DIE, 0, newOP(OP_PUSHMARK, 0),
+ newSVOP(OP_CONST, 0, newSVpvs("Unimplemented")));
+ }
+ | PLUGEXPR
;
-listexpr: /* NULL */
- { $$ = Nullop; }
- | argexpr
- { $$ = $1; }
+/* "my" declarations, with optional attributes */
+myattrterm: MY myterm myattrlist
+ { $$ = my_attrs($2,$3); }
+ | MY myterm
+ { $$ = localize($2,$1); }
;
-listexprcom: /* NULL */
- { $$ = Nullop; }
- | expr
+/* Things that can be "my"'d */
+myterm : '(' expr ')'
+ { $$ = sawparens($2); }
+ | '(' ')'
+ { $$ = sawparens(newNULLLIST()); }
+
+ | scalar %prec '('
+ { $$ = $1; }
+ | hsh %prec '('
{ $$ = $1; }
- | expr ','
+ | ary %prec '('
{ $$ = $1; }
;
-local : LOCAL { $$ = 0; }
- | MY { $$ = 1; }
+/* Basic list expressions */
+optlistexpr: /* NULL */ %prec PREC_LOW
+ { $$ = (OP*)NULL; }
+ | listexpr %prec PREC_LOW
+ { $$ = $1; }
+ ;
+
+optexpr: /* NULL */
+ { $$ = (OP*)NULL; }
+ | expr
+ { $$ = $1; }
;
+/* A little bit of trickery to make "for my $foo (@bar)" actually be
+ lexical */
my_scalar: scalar
- { in_my = 0; $$ = my($1); }
+ { parser->in_my = 0; $$ = my($1); }
;
amper : '&' indirob
;
ary : '@' indirob
- { $$ = newAVREF($2); }
+ { $$ = newAVREF($2);
+ if ($$) $$->op_private |= $1;
+ }
;
hsh : '%' indirob
- { $$ = newHVREF($2); }
+ { $$ = newHVREF($2);
+ if ($$) $$->op_private |= $1;
+ }
;
arylen : DOLSHARP indirob
{ $$ = newAVREF($2); }
+ | term ARROW DOLSHARP '*'
+ { $$ = newAVREF($1); }
;
star : '*' indirob
{ $$ = newGVREF(0,$2); }
;
+sliceme : ary
+ | term ARROW '@'
+ { $$ = newAVREF($1); }
+ ;
+
+kvslice : hsh
+ | term ARROW '%'
+ { $$ = newHVREF($1); }
+ ;
+
+gelem : star
+ | term ARROW '*'
+ { $$ = newGVREF(0,$1); }
+ ;
+
+/* Indirect objects */
indirob : WORD
{ $$ = scalar($1); }
- | scalar
- { $$ = scalar($1); }
+ | scalar %prec PREC_LOW
+ { $$ = scalar($1); }
| block
- { $$ = scope($1); }
+ { $$ = op_scope($1); }
| PRIVATEREF
{ $$ = $1; }
;
-
-%% /* PROGRAM */