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perly.y
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/* perly.y
*
* Copyright (c) 1991-2002, 2003, 2004, 2005, 2006 Larry Wall
* Copyright (c) 2007, 2008, 2009, 2010, 2011 by Larry Wall and others
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
*/
/*
* 'I see,' laughed Strider. 'I look foul and feel fair. Is that it?
* All that is gold does not glitter, not all those who wander are lost.'
*
* [p.171 of _The Lord of the Rings_, I/x: "Strider"]
*/
/*
* This file holds the grammar for the Perl language. If edited, you need
* to run regen_perly.pl, which re-creates the files perly.h, perly.tab
* and perly.act which are derived from this.
*
* The main job of this grammar is to call the various newFOO()
* functions in op.c to build a syntax tree of OP structs.
* It relies on the lexer in toke.c to do the tokenizing.
*
* Note: due to the way that the cleanup code works WRT to freeing ops on
* the parse stack, it is dangerous to assign to the $n variables within
* an action.
*/
/* Make the parser re-entrant. */
%define api.pure
%start grammar
%union {
I32 ival; /* __DEFAULT__ (marker for regen_perly.pl;
must always be 1st union member) */
void *pval;
OP *opval;
GV *gvval;
}
%token <ival> GRAMPROG GRAMEXPR GRAMBLOCK GRAMBARESTMT GRAMFULLSTMT GRAMSTMTSEQ GRAMSUBSIGNATURE
/* Tokens emitted by toke.c for simple punctiation characters - &, {, }, etc... */
%token <ival> PERLY_AMPERSAND
%token <ival> PERLY_BRACE_OPEN
%token <ival> PERLY_BRACE_CLOSE
%token <ival> PERLY_BRACKET_OPEN
%token <ival> PERLY_BRACKET_CLOSE
%token <ival> PERLY_COMMA
%token <ival> PERLY_DOLLAR
%token <ival> PERLY_DOT
%token <ival> PERLY_EQUAL_SIGN
%token <ival> PERLY_MINUS
%token <ival> PERLY_PERCENT_SIGN
%token <ival> PERLY_PLUS
%token <ival> PERLY_SEMICOLON
%token <ival> PERLY_SLASH
%token <ival> PERLY_SNAIL
%token <ival> PERLY_STAR
/* Tokens emitted by toke.c on simple keywords */
%token <ival> KW_FORMAT KW_PACKAGE KW_CLASS
%token <ival> KW_LOCAL KW_MY KW_FIELD
%token <ival> KW_IF KW_ELSE KW_ELSIF KW_UNLESS
%token <ival> KW_FOR KW_UNTIL KW_WHILE KW_CONTINUE
%token <ival> KW_GIVEN KW_WHEN KW_DEFAULT
%token <ival> KW_TRY KW_CATCH KW_FINALLY KW_DEFER
%token <ival> KW_REQUIRE KW_DO
/* The 'use' and 'no' keywords both emit this */
%token <ival> KW_USE_or_NO
/* The 'sub' keyword is a bit special; four different tokens depending on
* named-vs-anon, and whether signatures are in effect */
%token <ival> KW_SUB_named KW_SUB_named_sig KW_SUB_anon KW_SUB_anon_sig
%token <ival> KW_METHOD_named KW_METHOD_anon
/* Tokens emitted in other situations */
%token <opval> BAREWORD METHCALL0 METHCALL THING PMFUNC PRIVATEREF QWLIST
%token <opval> FUNC0OP FUNC0SUB UNIOPSUB LSTOPSUB
%token <opval> PLUGEXPR PLUGSTMT
%token <opval> LABEL
%token <ival> LOOPEX DOTDOT YADAYADA
%token <ival> FUNC0 FUNC1 FUNC UNIOP LSTOP BLKLSTOP
%token <ival> POWOP MULOP ADDOP
%token <ival> DOLSHARP HASHBRACK NOAMP
%token <ival> COLONATTR FORMLBRACK FORMRBRACK
%token <ival> SUBLEXSTART SUBLEXEND
%token <ival> PHASER
%type <ival> grammar remember mremember
%type <ival> startsub startanonsub startanonmethod startformsub
%type <ival> mintro
%type <ival> sigsub_or_method_named
%type <opval> stmtseq fullstmt labfullstmt barestmt block mblock else finally
%type <opval> expr term subscripted scalar ary hsh arylen star amper sideff
%type <opval> condition
%type <opval> catch_paren
%type <opval> empty
%type <opval> sliceme kvslice gelem
%type <opval> listexpr nexpr texpr iexpr mexpr mnexpr
%type <opval> optlistexpr optexpr optrepl indirob listop methodname
%type <opval> formname subname proto cont my_scalar my_var
%type <opval> list_of_scalars my_list_of_scalars refgen_topic formblock
%type <opval> subattrlist myattrlist myattrterm myterm
%type <pval> fieldvar /* pval is PADNAME */
%type <opval> optfieldattrlist fielddecl
%type <opval> termbinop termunop anonymous termdo
%type <opval> termrelop relopchain termeqop eqopchain
%type <ival> sigslurpsigil
%type <opval> sigvarname sigscalarelem sigslurpelem
%type <opval> sigelem siglist optsiglist subsigguts subsignature optsubsignature
%type <opval> subbody optsubbody sigsubbody optsigsubbody
%type <opval> formstmtseq formline formarg
%nonassoc <ival> PREC_LOW
%nonassoc LOOPEX
%nonassoc <pval> PLUGIN_LOW_OP
%left <ival> OROP <pval> PLUGIN_LOGICAL_OR_LOW_OP
%left <ival> ANDOP <pval> PLUGIN_LOGICAL_AND_LOW_OP
%right <ival> NOTOP
%nonassoc LSTOP LSTOPSUB BLKLSTOP
%left PERLY_COMMA
%right <ival> ASSIGNOP <pval> PLUGIN_ASSIGN_OP
%right <ival> PERLY_QUESTION_MARK PERLY_COLON
%nonassoc DOTDOT
%left <ival> OROR DORDOR <pval> PLUGIN_LOGICAL_OR_OP
%left <ival> ANDAND <pval> PLUGIN_LOGICAL_AND_OP
%left <ival> BITOROP
%left <ival> BITANDOP
%left <ival> CHEQOP NCEQOP
%left <ival> CHRELOP NCRELOP
%nonassoc <pval> PLUGIN_REL_OP
%nonassoc UNIOP UNIOPSUB
%nonassoc KW_REQUIRE
%left <ival> SHIFTOP
%left ADDOP <pval> PLUGIN_ADD_OP
%left MULOP <pval> PLUGIN_MUL_OP
%left <ival> MATCHOP
%right <ival> PERLY_EXCLAMATION_MARK PERLY_TILDE UMINUS REFGEN
%right POWOP <pval> PLUGIN_POW_OP
%nonassoc <ival> PREINC PREDEC POSTINC POSTDEC POSTJOIN
%nonassoc <pval> PLUGIN_HIGH_OP
%left <ival> ARROW
%nonassoc <ival> PERLY_PAREN_CLOSE
%left <ival> PERLY_PAREN_OPEN
%left PERLY_BRACKET_OPEN PERLY_BRACE_OPEN
%% /* RULES */
/* Top-level choice of what kind of thing yyparse was called to parse */
grammar : GRAMPROG
{
parser->expect = XSTATE;
$<ival>$ = 0;
}
remember stmtseq
{
newPROG(block_end($remember,$stmtseq));
PL_compiling.cop_seq = 0;
$$ = 0;
}
| GRAMEXPR
{
parser->expect = XTERM;
$<ival>$ = 0;
}
optexpr
{
PL_eval_root = $optexpr;
$$ = 0;
}
| GRAMBLOCK
{
parser->expect = XBLOCK;
$<ival>$ = 0;
}
block
{
PL_pad_reset_pending = TRUE;
PL_eval_root = $block;
$$ = 0;
yyunlex();
parser->yychar = yytoken = YYEOF;
}
| GRAMBARESTMT
{
parser->expect = XSTATE;
$<ival>$ = 0;
}
barestmt
{
PL_pad_reset_pending = TRUE;
PL_eval_root = $barestmt;
$$ = 0;
yyunlex();
parser->yychar = yytoken = YYEOF;
}
| GRAMFULLSTMT
{
parser->expect = XSTATE;
$<ival>$ = 0;
}
fullstmt
{
PL_pad_reset_pending = TRUE;
PL_eval_root = $fullstmt;
$$ = 0;
yyunlex();
parser->yychar = yytoken = YYEOF;
}
| GRAMSTMTSEQ
{
parser->expect = XSTATE;
$<ival>$ = 0;
}
stmtseq
{
PL_eval_root = $stmtseq;
$$ = 0;
}
| GRAMSUBSIGNATURE
{
parser->expect = XSTATE;
$<ival>$ = 0;
}
subsigguts
{
PL_eval_root = $subsigguts;
$$ = 0;
}
;
/* Either a signatured 'sub' or 'method' keyword */
sigsub_or_method_named
: KW_SUB_named_sig
{ $$ = KW_SUB_named_sig; }
| KW_METHOD_named
{ $$ = KW_METHOD_named; }
;
/* An ordinary block */
block : PERLY_BRACE_OPEN remember stmtseq PERLY_BRACE_CLOSE
{ if (parser->copline > (line_t)$PERLY_BRACE_OPEN)
parser->copline = (line_t)$PERLY_BRACE_OPEN;
$$ = block_end($remember, $stmtseq);
}
;
empty
: %empty { $$ = NULL; }
;
/* format body */
formblock: PERLY_EQUAL_SIGN remember PERLY_SEMICOLON FORMRBRACK formstmtseq PERLY_SEMICOLON PERLY_DOT
{ if (parser->copline > (line_t)$PERLY_EQUAL_SIGN)
parser->copline = (line_t)$PERLY_EQUAL_SIGN;
$$ = block_end($remember, $formstmtseq);
}
;
remember: %empty /* start a full lexical scope */
{ $$ = block_start(TRUE);
parser->parsed_sub = 0; }
;
mblock : PERLY_BRACE_OPEN mremember stmtseq PERLY_BRACE_CLOSE
{ if (parser->copline > (line_t)$PERLY_BRACE_OPEN)
parser->copline = (line_t)$PERLY_BRACE_OPEN;
$$ = block_end($mremember, $stmtseq);
}
;
mremember: %empty /* start a partial lexical scope */
{ $$ = block_start(FALSE);
parser->parsed_sub = 0; }
;
/* The parenthesized variable of a catch block */
catch_paren: empty
/* not really valid grammar but we detect it in the
* action block to throw a nicer error message */
| PERLY_PAREN_OPEN
{ parser->in_my = 1; }
scalar
{ parser->in_my = 0; intro_my(); }
PERLY_PAREN_CLOSE
{ $$ = $scalar; }
;
/* A sequence of statements in the program */
stmtseq
: empty
| stmtseq[list] fullstmt
{ $$ = op_append_list(OP_LINESEQ, $list, $fullstmt);
PL_pad_reset_pending = TRUE;
if ($list && $fullstmt)
PL_hints |= HINT_BLOCK_SCOPE;
}
;
/* A sequence of format lines */
formstmtseq
: empty
| formstmtseq[list] formline
{ $$ = op_append_list(OP_LINESEQ, $list, $formline);
PL_pad_reset_pending = TRUE;
if ($list && $formline)
PL_hints |= HINT_BLOCK_SCOPE;
}
;
/* A statement in the program, including optional labels */
fullstmt: barestmt
{
$$ = $barestmt ? newSTATEOP(0, NULL, $barestmt) : NULL;
}
| labfullstmt
{ $$ = $labfullstmt; }
;
labfullstmt: LABEL barestmt
{
SV *label = cSVOPx_sv($LABEL);
$$ = newSTATEOP(SvFLAGS(label) & SVf_UTF8,
savepv(SvPVX_const(label)), $barestmt);
op_free($LABEL);
}
| LABEL labfullstmt[list]
{
SV *label = cSVOPx_sv($LABEL);
$$ = newSTATEOP(SvFLAGS(label) & SVf_UTF8,
savepv(SvPVX_const(label)), $list);
op_free($LABEL);
}
;
/* A bare statement, lacking label and other aspects of state op */
barestmt: PLUGSTMT
{ $$ = $PLUGSTMT; }
| KW_FORMAT startformsub formname formblock
{
CV *fmtcv = PL_compcv;
newFORM($startformsub, $formname, $formblock);
$$ = NULL;
if (CvOUTSIDE(fmtcv) && !CvEVAL(CvOUTSIDE(fmtcv))) {
pad_add_weakref(fmtcv);
}
parser->parsed_sub = 1;
}
| KW_SUB_named subname startsub
/* sub declaration or definition not within scope
of 'use feature "signatures"'*/
{
init_named_cv(PL_compcv, $subname);
parser->in_my = 0;
parser->in_my_stash = NULL;
}
proto subattrlist optsubbody
{
SvREFCNT_inc_simple_void(PL_compcv);
$subname->op_type == OP_CONST
? newATTRSUB($startsub, $subname, $proto, $subattrlist, $optsubbody)
: newMYSUB($startsub, $subname, $proto, $subattrlist, $optsubbody)
;
$$ = NULL;
intro_my();
parser->parsed_sub = 1;
}
| sigsub_or_method_named subname startsub
/* sub declaration or definition under 'use feature
* "signatures"'. (Note that a signature isn't
* allowed in a declaration)
*/
{
init_named_cv(PL_compcv, $subname);
if($sigsub_or_method_named == KW_METHOD_named) {
croak_kw_unless_class("method");
class_prepare_method_parse(PL_compcv);
}
parser->in_my = 0;
parser->in_my_stash = NULL;
}
subattrlist optsigsubbody
{
OP *body = $optsigsubbody;
SvREFCNT_inc_simple_void(PL_compcv);
$subname->op_type == OP_CONST
? newATTRSUB($startsub, $subname, NULL, $subattrlist, body)
: newMYSUB( $startsub, $subname, NULL, $subattrlist, body)
;
$$ = NULL;
intro_my();
parser->parsed_sub = 1;
}
| PHASER startsub
{
switch($PHASER) {
case KEY_ADJUST:
croak_kw_unless_class("ADJUST");
class_prepare_method_parse(PL_compcv);
break;
default:
NOT_REACHED;
}
}
optsubbody
{
OP *body = $optsubbody;
SvREFCNT_inc_simple_void(PL_compcv);
CV *cv;
switch($PHASER) {
case KEY_ADJUST:
cv = newATTRSUB($startsub, NULL, NULL, NULL, body);
class_add_ADJUST(PL_curstash, cv);
break;
}
$$ = NULL;
}
| KW_PACKAGE BAREWORD[version] BAREWORD[package] PERLY_SEMICOLON
/* version and package appear in the reverse order to what may be
* expected, because toke.c has already pushed both of them to a stack
* by calling force_next() from within force_version().
* When the parser pops them back out again they appear swapped */
{
package($package);
if ($version)
package_version($version);
$$ = NULL;
}
| KW_CLASS BAREWORD[version] BAREWORD[package] subattrlist PERLY_SEMICOLON
{
package($package);
if ($version)
package_version($version);
$$ = NULL;
class_setup_stash(PL_curstash);
if ($subattrlist) {
class_apply_attributes(PL_curstash, $subattrlist);
}
}
| KW_USE_or_NO startsub
{ CvSPECIAL_on(PL_compcv); /* It's a BEGIN {} */ }
BAREWORD[version] BAREWORD[module] optlistexpr PERLY_SEMICOLON
/* version and package appear in reverse order for the same reason as
* KW_PACKAGE; see comment above */
{
SvREFCNT_inc_simple_void(PL_compcv);
utilize($KW_USE_or_NO, $startsub, $version, $module, $optlistexpr);
parser->parsed_sub = 1;
$$ = NULL;
}
| KW_IF PERLY_PAREN_OPEN remember mexpr PERLY_PAREN_CLOSE mblock else
{
$$ = block_end($remember,
newCONDOP(0, $mexpr, op_scope($mblock), $else));
parser->copline = (line_t)$KW_IF;
}
| KW_UNLESS PERLY_PAREN_OPEN remember mexpr PERLY_PAREN_CLOSE mblock else
{
$$ = block_end($remember,
newCONDOP(0, $mexpr, $else, op_scope($mblock)));
parser->copline = (line_t)$KW_UNLESS;
}
| KW_GIVEN PERLY_PAREN_OPEN remember mexpr PERLY_PAREN_CLOSE mblock
{
$$ = block_end($remember, newGIVENOP($mexpr, op_scope($mblock), 0));
parser->copline = (line_t)$KW_GIVEN;
}
| KW_WHEN PERLY_PAREN_OPEN remember mexpr PERLY_PAREN_CLOSE mblock
{ $$ = block_end($remember, newWHENOP($mexpr, op_scope($mblock))); }
| KW_DEFAULT block
{ $$ = newWHENOP(0, op_scope($block)); }
| KW_WHILE PERLY_PAREN_OPEN remember texpr PERLY_PAREN_CLOSE mintro mblock cont
{
$$ = block_end($remember,
newWHILEOP(0, 1, NULL,
$texpr, $mblock, $cont, $mintro));
parser->copline = (line_t)$KW_WHILE;
}
| KW_UNTIL PERLY_PAREN_OPEN remember iexpr PERLY_PAREN_CLOSE mintro mblock cont
{
$$ = block_end($remember,
newWHILEOP(0, 1, NULL,
$iexpr, $mblock, $cont, $mintro));
parser->copline = (line_t)$KW_UNTIL;
}
| KW_FOR PERLY_PAREN_OPEN remember mnexpr[init_mnexpr] PERLY_SEMICOLON
{ parser->expect = XTERM; }
texpr PERLY_SEMICOLON
{ parser->expect = XTERM; }
mintro mnexpr[iterate_mnexpr] PERLY_PAREN_CLOSE
mblock
{
OP *initop = $init_mnexpr;
OP *forop = newWHILEOP(0, 1, NULL,
scalar($texpr), $mblock, $iterate_mnexpr, $mintro);
if (initop) {
forop = op_prepend_elem(OP_LINESEQ, initop,
op_append_elem(OP_LINESEQ,
newOP(OP_UNSTACK, OPf_SPECIAL),
forop));
}
PL_hints |= HINT_BLOCK_SCOPE;
$$ = block_end($remember, forop);
parser->copline = (line_t)$KW_FOR;
}
| KW_FOR KW_MY remember my_scalar PERLY_PAREN_OPEN mexpr PERLY_PAREN_CLOSE mblock cont
{
$$ = block_end($remember, newFOROP(0, $my_scalar, $mexpr, $mblock, $cont));
parser->copline = (line_t)$KW_FOR;
}
| KW_FOR KW_MY remember PERLY_PAREN_OPEN my_list_of_scalars PERLY_PAREN_CLOSE PERLY_PAREN_OPEN mexpr PERLY_PAREN_CLOSE mblock cont
{
if ($my_list_of_scalars->op_type == OP_PADSV)
/* degenerate case of 1 var: for my ($x) ....
Flag it so it can be special-cased in newFOROP */
$my_list_of_scalars->op_flags |= OPf_PARENS;
$$ = block_end($remember, newFOROP(0, $my_list_of_scalars, $mexpr, $mblock, $cont));
parser->copline = (line_t)$KW_FOR;
}
| KW_FOR scalar PERLY_PAREN_OPEN remember mexpr PERLY_PAREN_CLOSE mblock cont
{
$$ = block_end($remember, newFOROP(0,
op_lvalue($scalar, OP_ENTERLOOP), $mexpr, $mblock, $cont));
parser->copline = (line_t)$KW_FOR;
}
| KW_FOR my_refgen remember my_var
{ parser->in_my = 0; $<opval>$ = my($my_var); }[variable]
PERLY_PAREN_OPEN mexpr PERLY_PAREN_CLOSE mblock cont
{
$$ = block_end(
$remember,
newFOROP(0,
op_lvalue(
newUNOP(OP_REFGEN, 0,
$<opval>variable),
OP_ENTERLOOP),
$mexpr, $mblock, $cont)
);
parser->copline = (line_t)$KW_FOR;
}
| KW_FOR REFGEN refgen_topic PERLY_PAREN_OPEN remember mexpr PERLY_PAREN_CLOSE mblock cont
{
$$ = block_end($remember, newFOROP(
0, op_lvalue(newUNOP(OP_REFGEN, 0,
$refgen_topic),
OP_ENTERLOOP), $mexpr, $mblock, $cont));
parser->copline = (line_t)$KW_FOR;
}
| KW_FOR PERLY_PAREN_OPEN remember mexpr PERLY_PAREN_CLOSE mblock cont
{
$$ = block_end($remember,
newFOROP(0, NULL, $mexpr, $mblock, $cont));
parser->copline = (line_t)$KW_FOR;
}
| KW_TRY mblock[try] KW_CATCH remember catch_paren[scalar]
{
if(!$scalar) {
yyerror("catch block requires a (VAR)");
YYERROR;
}
}
mblock[catch] finally
{
$$ = newTRYCATCHOP(0,
$try, $scalar, block_end($remember, op_scope($catch)));
if($finally)
$$ = op_wrap_finally($$, $finally);
parser->copline = (line_t)$KW_TRY;
}
| block cont
{
/* a block is a loop that happens once */
$$ = newWHILEOP(0, 1, NULL,
NULL, $block, $cont, 0);
}
| KW_PACKAGE BAREWORD[version] BAREWORD[package] PERLY_BRACE_OPEN remember
{
package($package);
if ($version) {
package_version($version);
}
}
stmtseq PERLY_BRACE_CLOSE
{
/* a block is a loop that happens once */
$$ = newWHILEOP(0, 1, NULL,
NULL, block_end($remember, $stmtseq), NULL, 0);
if (parser->copline > (line_t)$PERLY_BRACE_OPEN)
parser->copline = (line_t)$PERLY_BRACE_OPEN;
}
| KW_CLASS BAREWORD[version] BAREWORD[package] subattrlist PERLY_BRACE_OPEN remember
{
package($package);
if ($version) {
package_version($version);
}
class_setup_stash(PL_curstash);
if ($subattrlist) {
class_apply_attributes(PL_curstash, $subattrlist);
}
}
stmtseq PERLY_BRACE_CLOSE
{
/* a block is a loop that happens once */
$$ = newWHILEOP(0, 1, NULL,
NULL, block_end($remember, $stmtseq), NULL, 0);
if (parser->copline > (line_t)$PERLY_BRACE_OPEN)
parser->copline = (line_t)$PERLY_BRACE_OPEN;
}
| fielddecl PERLY_SEMICOLON
{
$$ = $fielddecl;
}
| sideff PERLY_SEMICOLON
{
$$ = $sideff;
}
| KW_DEFER mblock
{
$$ = newDEFEROP(0, op_scope($2));
}
| YADAYADA PERLY_SEMICOLON
{
/* diag_listed_as: Unimplemented */
$$ = newLISTOP(OP_DIE, 0, newOP(OP_PUSHMARK, 0),
newSVOP(OP_CONST, 0, newSVpvs("Unimplemented")));
}
| PERLY_SEMICOLON
{
$$ = NULL;
parser->copline = NOLINE;
}
;
/* Format line */
formline: THING formarg
{ OP *list;
if ($formarg) {
OP *term = $formarg;
list = op_append_elem(OP_LIST, $THING, term);
}
else {
list = $THING;
}
if (parser->copline == NOLINE)
parser->copline = CopLINE(PL_curcop)-1;
else parser->copline--;
$$ = newSTATEOP(0, NULL,
op_convert_list(OP_FORMLINE, 0, list));
}
;
formarg
: empty
| FORMLBRACK stmtseq FORMRBRACK
{ $$ = op_unscope($stmtseq); }
;
condition: expr
;
/* An expression which may have a side-effect */
sideff : error
{ $$ = NULL; }
| expr[body]
{ $$ = $body; }
| expr[body] KW_IF condition
{ $$ = newLOGOP(OP_AND, 0, $condition, $body); }
| expr[body] KW_UNLESS condition
{ $$ = newLOGOP(OP_OR, 0, $condition, $body); }
| expr[body] KW_WHILE condition
{ $$ = newLOOPOP(OPf_PARENS, 1, scalar($condition), $body); }
| expr[body] KW_UNTIL iexpr
{ $$ = newLOOPOP(OPf_PARENS, 1, $iexpr, $body); }
| expr[body] KW_FOR condition
{ $$ = newFOROP(0, NULL, $condition, $body, NULL);
parser->copline = (line_t)$KW_FOR; }
| expr[body] KW_WHEN condition
{ $$ = newWHENOP($condition, op_scope($body)); }
;
/* else and elsif blocks */
else
: empty
| KW_ELSE mblock
{
($mblock)->op_flags |= OPf_PARENS;
$$ = op_scope($mblock);
}
| KW_ELSIF PERLY_PAREN_OPEN mexpr PERLY_PAREN_CLOSE mblock else[else.recurse]
{ parser->copline = (line_t)$KW_ELSIF;
$$ = newCONDOP(0,
newSTATEOP(OPf_SPECIAL,NULL,$mexpr),
op_scope($mblock), $[else.recurse]);
PL_hints |= HINT_BLOCK_SCOPE;
}
;
/* Continue blocks */
cont
: empty
| KW_CONTINUE block
{ $$ = op_scope($block); }
;
/* Finally blocks */
finally : %empty
{ $$ = NULL; }
| KW_FINALLY block
{ $$ = op_scope($block); }
;
/* determine whether there are any new my declarations */
mintro : %empty
{ $$ = (PL_min_intro_pending &&
PL_max_intro_pending >= PL_min_intro_pending);
intro_my(); }
/* Normal expression */
nexpr
: empty
| sideff
;
/* Boolean expression */
texpr : %empty /* NULL means true */
{ YYSTYPE tmplval;
(void)scan_num("1", &tmplval);
$$ = tmplval.opval; }
| expr
;
/* Inverted boolean expression */
iexpr : expr
{ $$ = invert(scalar($expr)); }
;
/* Expression with its own lexical scope */
mexpr : expr
{ $$ = $expr; intro_my(); }
;
mnexpr : nexpr
{ $$ = $nexpr; intro_my(); }
;
formname: BAREWORD { $$ = $BAREWORD; }
| empty
;
startsub: %empty /* start a regular subroutine scope */
{ $$ = start_subparse(FALSE, 0);
SAVEFREESV(PL_compcv); }
;
startanonsub: %empty /* start an anonymous subroutine scope */
{ $$ = start_subparse(FALSE, CVf_ANON);
SAVEFREESV(PL_compcv); }
;
startanonmethod: %empty /* start an anonymous method scope */
{ $$ = start_subparse(FALSE, CVf_ANON|CVf_IsMETHOD);
SAVEFREESV(PL_compcv); }
;
startformsub: %empty /* start a format subroutine scope */
{ $$ = start_subparse(TRUE, 0);
SAVEFREESV(PL_compcv); }
;
/* Name of a subroutine - must be a bareword, could be special */
subname : BAREWORD
| PRIVATEREF
;
/* Subroutine prototype */
proto
: empty
| THING
;
/* Optional list of subroutine attributes */
subattrlist
: empty
| COLONATTR THING
{
OP *attrlist = $THING;
if(attrlist && !PL_parser->sig_seen)
attrlist = apply_builtin_cv_attributes(PL_compcv, attrlist);
$$ = attrlist;
}
| COLONATTR
{ $$ = NULL; }
;
/* List of attributes for a "my" variable declaration */
myattrlist: COLONATTR THING
{ $$ = $THING; }
| COLONATTR
{ $$ = NULL; }
;
/* --------------------------------------
* subroutine signature parsing
*/
/* the '' or 'foo' part of a '$' or '@foo' etc signature variable */
sigvarname: %empty
{ parser->in_my = 0; $$ = NULL; }
| PRIVATEREF
{ parser->in_my = 0; $$ = $PRIVATEREF; }
;
sigslurpsigil:
PERLY_SNAIL
{ $$ = '@'; }
| PERLY_PERCENT_SIGN
{ $$ = '%'; }
/* @, %, @foo, %foo */
sigslurpelem: sigslurpsigil sigvarname
{
subsignature_append_slurpy($sigslurpsigil, $sigvarname);
$$ = NULL;
}
| sigslurpsigil sigvarname ASSIGNOP
{
yyerror("A slurpy parameter may not have a default value");
}
| sigslurpsigil sigvarname ASSIGNOP term
{
yyerror("A slurpy parameter may not have a default value");
}
;
/* subroutine signature scalar element: e.g. '$x', '$=', '$x = $default' */
sigscalarelem:
PERLY_DOLLAR sigvarname
{
subsignature_append_positional($sigvarname, 0, NULL);
$$ = NULL;
}
| PERLY_DOLLAR sigvarname ASSIGNOP
{
subsignature_append_positional($sigvarname, $ASSIGNOP, newOP(OP_NULL, 0));
$$ = NULL;
}
| PERLY_DOLLAR sigvarname ASSIGNOP term[defop]
{
subsignature_append_positional($sigvarname, $ASSIGNOP, $defop);
$$ = NULL;
}
;
/* subroutine signature element: e.g. '$x = $default' or '%h' */
sigelem: sigscalarelem
{ parser->in_my = KEY_sigvar; $$ = $sigscalarelem; }
| sigslurpelem
{ parser->in_my = KEY_sigvar; $$ = $sigslurpelem; }
;
/* list of subroutine signature elements
* These parser tokens no longer emit anything; they are combined just for
* their side-effect on the parser structures. */
siglist:
siglist[list] PERLY_COMMA
| siglist[list] PERLY_COMMA sigelem[element]
| sigelem[element] %prec PREC_LOW
;
/* () or (....) */
optsiglist
: empty
| siglist
;
/* optional subroutine signature */
optsubsignature
: empty
| subsignature
;
/* Subroutine signature */
subsignature: PERLY_PAREN_OPEN subsigguts PERLY_PAREN_CLOSE
{ $$ = $subsigguts; }
subsigguts:
{
ENTER;
subsignature_start();
parser->in_my = KEY_sigvar;
}
optsiglist
{
if (!FEATURE_SIGNATURES_IS_ENABLED && !CvIsMETHOD(PL_compcv))
Perl_croak(aTHX_ "Experimental "
"subroutine signatures not enabled");
/* We shouldn't get here otherwise */
$$ = subsignature_finish();
CvSIGNATURE_on(PL_compcv);
parser->in_my = 0;
/* tell the toker that attrributes can follow
* this sig, but only so that the toker
* can skip through any (illegal) trailing
* attribute text then give a useful error
* message about "attributes before sig",
* rather than falling over ina mess at
* unrecognised syntax.
*/
parser->expect = XATTRBLOCK;
parser->sig_seen = TRUE;
LEAVE;
}
;
/* Optional subroutine body (for named subroutine declaration) */
optsubbody
: subbody
| PERLY_SEMICOLON { $$ = NULL; }
;
/* Subroutine body (without signature) */
subbody: remember PERLY_BRACE_OPEN stmtseq PERLY_BRACE_CLOSE
{
if (parser->copline > (line_t)$PERLY_BRACE_OPEN)
parser->copline = (line_t)$PERLY_BRACE_OPEN;
$$ = block_end($remember, $stmtseq);
}
;
/* optional [ Subroutine body with optional signature ] (for named
* subroutine declaration) */
optsigsubbody
: sigsubbody
| PERLY_SEMICOLON { $$ = NULL; }
;
/* Subroutine body with optional signature */
sigsubbody: remember optsubsignature PERLY_BRACE_OPEN
{ PL_parser->sig_seen = FALSE; }
stmtseq PERLY_BRACE_CLOSE
{
if (parser->copline > (line_t)$PERLY_BRACE_OPEN)
parser->copline = (line_t)$PERLY_BRACE_OPEN;
$$ = block_end($remember,
op_append_list(OP_LINESEQ, $optsubsignature, $stmtseq));
}
;
/* Ordinary expressions; logical combinations */
expr : expr[lhs] ANDOP expr[rhs]
{ $$ = newLOGOP(OP_AND, 0, $lhs, $rhs); }
| expr[lhs] PLUGIN_LOGICAL_AND_LOW_OP[op] expr[rhs]
{ $$ = build_infix_plugin($lhs, $rhs, $op); }
| expr[lhs] OROP[operator] expr[rhs]
{ $$ = newLOGOP($operator, 0, $lhs, $rhs); }
| expr[lhs] PLUGIN_LOGICAL_OR_LOW_OP[op] expr[rhs]
{ $$ = build_infix_plugin($lhs, $rhs, $op); }
| listexpr %prec PREC_LOW
;
/* Expressions are a list of terms joined by commas */
listexpr: listexpr[list] PERLY_COMMA
{ $$ = $list; }
| listexpr[list] PERLY_COMMA term
{
OP* term = $term;
$$ = op_append_elem(OP_LIST, $list, term);
}
| term %prec PREC_LOW
;
/* List operators */
listop : LSTOP indirob listexpr /* map {...} @args or print $fh @args */
{ $$ = op_convert_list($LSTOP, OPf_STACKED,
op_prepend_elem(OP_LIST, newGVREF($LSTOP,$indirob), $listexpr) );