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perly.y
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1996-02-14
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14KB
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572 lines
/* perly.y
*
* Copyright (c) 1991-1994, 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.
*
*/
/*
* '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.'
*/
%{
#include "EXTERN.h"
#include "perl.h"
static void
dep()
{
deprecate("\"do\" to call subroutines");
}
%}
%start prog
%union {
I32 ival;
char *pval;
OP *opval;
GV *gvval;
}
%token <ival> '{' ')'
%token <opval> WORD METHOD FUNCMETH THING PMFUNC PRIVATEREF
%token <opval> FUNC0SUB UNIOPSUB LSTOPSUB
%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> RELOP EQOP MULOP ADDOP
%token <ival> DOLSHARP DO LOCAL HASHBRACK NOAMP
%type <ival> prog decl format remember startsub '&'
%type <opval> block lineseq line loop cond nexpr else argexpr
%type <opval> expr term scalar ary hsh arylen star amper sideff
%type <opval> listexpr listexprcom indirob
%type <opval> texpr listop method proto
%type <pval> label
%type <opval> cont
%left <ival> OROP
%left ANDOP
%right NOTOP
%nonassoc <ival> LSTOP
%left ','
%right <ival> ASSIGNOP
%right '?' ':'
%nonassoc DOTDOT
%left OROR
%left ANDAND
%left <ival> BITOROP
%left <ival> BITANDOP
%nonassoc EQOP
%nonassoc RELOP
%nonassoc <ival> UNIOP
%left <ival> SHIFTOP
%left ADDOP
%left MULOP
%left <ival> MATCHOP
%right '!' '~' UMINUS REFGEN
%right <ival> POWOP
%nonassoc PREINC PREDEC POSTINC POSTDEC
%left ARROW
%left '('
%% /* RULES */
prog : /* NULL */
{
#if defined(YYDEBUG) && defined(DEBUGGING)
yydebug = (debug & 1);
#endif
expect = XSTATE;
}
/*CONTINUED*/ lineseq
{ newPROG($2); }
;
block : '{' remember lineseq '}'
{ $$ = block_end($1,$2,$3); }
;
remember: /* NULL */ /* start a lexical scope */
{ $$ = block_start(); }
;
lineseq : /* NULL */
{ $$ = Nullop; }
| lineseq decl
{ $$ = $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 ';'
{ $$ = newSTATEOP(0, $1, $2);
expect = XSTATE; }
;
sideff : error
{ $$ = Nullop; }
| expr
{ $$ = $1; }
| expr IF expr
{ $$ = newLOGOP(OP_AND, 0, $3, $1); }
| expr UNLESS expr
{ $$ = newLOGOP(OP_OR, 0, $3, $1); }
| expr WHILE expr
{ $$ = newLOOPOP(OPf_PARENS, 1, scalar($3), $1); }
| expr UNTIL expr
{ $$ = newLOOPOP(OPf_PARENS, 1, invert(scalar($3)), $1);}
;
else : /* NULL */
{ $$ = Nullop; }
| ELSE block
{ $$ = scope($2); }
| ELSIF '(' expr ')' block else
{ copline = $1;
$$ = newSTATEOP(0, 0,
newCONDOP(0, $3, scope($5), $6));
hints |= HINT_BLOCK_SCOPE; }
;
cond : IF '(' expr ')' block else
{ copline = $1;
$$ = newCONDOP(0, $3, scope($5), $6); }
| UNLESS '(' expr ')' block else
{ copline = $1;
$$ = newCONDOP(0,
invert(scalar($3)), scope($5), $6); }
| IF block block else
{ copline = $1;
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); }
;
cont : /* NULL */
{ $$ = Nullop; }
| CONTINUE block
{ $$ = scope($2); }
;
loop : label WHILE '(' texpr ')' block cont
{ copline = $2;
$$ = newSTATEOP(0, $1,
newWHILEOP(0, 1, (LOOP*)Nullop,
$4, $6, $7) ); }
| label UNTIL '(' expr ')' block cont
{ copline = $2;
$$ = newSTATEOP(0, $1,
newWHILEOP(0, 1, (LOOP*)Nullop,
invert(scalar($4)), $6, $7) ); }
| 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 scalar '(' expr ')' block cont
{ $$ = newFOROP(0, $1, $2, mod($3, OP_ENTERLOOP),
$5, $7, $8); }
| label FOR '(' expr ')' block cont
{ $$ = newFOROP(0, $1, $2, Nullop, $4, $6, $7); }
| label FOR '(' nexpr ';' texpr ';' nexpr ')' block
/* basically fake up an initialize-while lineseq */
{ copline = $2;
$$ = append_elem(OP_LINESEQ,
newSTATEOP(0, $1, scalar($4)),
newSTATEOP(0, $1,
newWHILEOP(0, 1, (LOOP*)Nullop,
scalar($6), $10, scalar($8)) )); }
| label block cont /* a block is a loop that happens once */
{ $$ = newSTATEOP(0,
$1, newWHILEOP(0, 1, (LOOP*)Nullop,
Nullop, $2, $3)); }
;
nexpr : /* NULL */
{ $$ = Nullop; }
| sideff
;
texpr : /* NULL means true */
{ (void)scan_num("1"); $$ = yylval.opval; }
| expr
;
label : /* empty */
{ $$ = Nullch; }
| LABEL
;
decl : format
{ $$ = 0; }
| subrout
{ $$ = 0; }
| package
{ $$ = 0; }
| use
{ $$ = 0; }
;
format : FORMAT startsub WORD block
{ newFORM($2, $3, $4); }
| FORMAT startsub block
{ newFORM($2, Nullop, $3); }
;
subrout : SUB startsub WORD proto block
{ newSUB($2, $3, $4, $5); }
| SUB startsub WORD proto ';'
{ newSUB($2, $3, $4, Nullop); expect = XSTATE; }
;
proto : /* NULL */
{ $$ = Nullop; }
| THING
;
startsub: /* NULL */ /* start a subroutine scope */
{ $$ = start_subparse(); }
;
package : PACKAGE WORD ';'
{ package($2); }
| PACKAGE ';'
{ package(Nullop); }
;
use : USE startsub WORD listexpr ';'
{ utilize($1, $2, $3, $4); }
;
expr : expr ANDOP expr
{ $$ = newLOGOP(OP_AND, 0, $1, $3); }
| expr OROP expr
{ $$ = newLOGOP($2, 0, $1, $3); }
| argexpr
;
argexpr : argexpr ','
{ $$ = $1; }
| argexpr ',' term
{ $$ = append_elem(OP_LIST, $1, $3); }
| term
;
listop : LSTOP indirob argexpr
{ $$ = convert($1, OPf_STACKED,
prepend_elem(OP_LIST, newGVREF($1,$2), $3) ); }
| FUNC '(' indirob expr ')'
{ $$ = convert($1, OPf_STACKED,
prepend_elem(OP_LIST, newGVREF($1,$3), $4) ); }
| term ARROW method '(' listexprcom ')'
{ $$ = convert(OP_ENTERSUB, OPf_STACKED,
append_elem(OP_LIST,
prepend_elem(OP_LIST, $1, $5),
newUNOP(OP_METHOD, 0, $3))); }
| METHOD indirob listexpr
{ $$ = convert(OP_ENTERSUB, OPf_STACKED,
append_elem(OP_LIST,
prepend_elem(OP_LIST, $2, $3),
newUNOP(OP_METHOD, 0, $1))); }
| FUNCMETH indirob '(' listexprcom ')'
{ $$ = convert(OP_ENTERSUB, OPf_STACKED,
append_elem(OP_LIST,
prepend_elem(OP_LIST, $2, $4),
newUNOP(OP_METHOD, 0, $1))); }
| LSTOP listexpr
{ $$ = convert($1, 0, $2); }
| FUNC '(' listexprcom ')'
{ $$ = convert($1, 0, $3); }
| LSTOPSUB startsub block listexpr %prec LSTOP
{ $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
append_elem(OP_LIST,
prepend_elem(OP_LIST, newANONSUB($2, 0, $3), $4),
$1)); }
;
method : METHOD
| scalar
;
term : term ASSIGNOP term
{ $$ = newASSIGNOP(OPf_STACKED, $1, $2, $3); }
| term POWOP term
{ $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
| term MULOP term
{ if ($2 != OP_REPEAT)
scalar($1);
$$ = newBINOP($2, 0, $1, scalar($3)); }
| term ADDOP term
{ $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
| term SHIFTOP term
{ $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
| term RELOP term
{ $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
| term EQOP term
{ $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
| term BITANDOP term
{ $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
| term BITOROP term
{ $$ = newBINOP($2, 0, scalar($1), scalar($3)); }
| term DOTDOT term
{ $$ = newRANGE($2, scalar($1), scalar($3));}
| term ANDAND term
{ $$ = newLOGOP(OP_AND, 0, $1, $3); }
| term OROR term
{ $$ = newLOGOP(OP_OR, 0, $1, $3); }
| term '?' term ':' term
{ $$ = newCONDOP(0, $1, $3, $5); }
| term MATCHOP term
{ $$ = bind_match($2, $1, $3); }
| '-' term %prec UMINUS
{ $$ = newUNOP(OP_NEGATE, 0, scalar($2)); }
| '+' term %prec UMINUS
{ $$ = $2; }
| '!' term
{ $$ = newUNOP(OP_NOT, 0, scalar($2)); }
| '~' term
{ $$ = newUNOP(OP_COMPLEMENT, 0, scalar($2));}
| REFGEN term
{ $$ = newUNOP(OP_REFGEN, 0, mod($2,OP_REFGEN)); }
| term POSTINC
{ $$ = newUNOP(OP_POSTINC, 0,
mod(scalar($1), OP_POSTINC)); }
| term POSTDEC
{ $$ = newUNOP(OP_POSTDEC, 0,
mod(scalar($1), OP_POSTDEC)); }
| PREINC term
{ $$ = newUNOP(OP_PREINC, 0,
mod(scalar($2), OP_PREINC)); }
| PREDEC term
{ $$ = newUNOP(OP_PREDEC, 0,
mod(scalar($2), OP_PREDEC)); }
| LOCAL term %prec UNIOP
{ $$ = localize($2,$1); }
| '(' expr ')'
{ $$ = sawparens($2); }
| '(' ')'
{ $$ = sawparens(newNULLLIST()); }
| '[' expr ']' %prec '('
{ $$ = 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 '('
{ $$ = newUNOP(OP_AV2ARYLEN, 0, ref($1, OP_AV2ARYLEN));}
| scalar '{' expr ';' '}' %prec '('
{ $$ = 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 '('
{ $$ = prepend_elem(OP_ASLICE,
newOP(OP_PUSHMARK, 0),
newLISTOP(OP_ASLICE, 0,
list($3),
ref($1, OP_ASLICE))); }
| ary '{' expr ';' '}' %prec '('
{ $$ = prepend_elem(OP_HSLICE,
newOP(OP_PUSHMARK, 0),
newLISTOP(OP_HSLICE, 0,
list($3),
ref(oopsHV($1), OP_HSLICE)));
expect = XOPERATOR; }
| THING %prec '('
{ $$ = $1; }
| amper
{ $$ = 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
{ $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
append_elem(OP_LIST, $3, scalar($2))); }
| DO term %prec UNIOP
{ $$ = 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 ')'
{ $$ = newUNOP(OP_ENTERSUB, OPf_SPECIAL|OPf_STACKED,
prepend_elem(OP_LIST,
$4,
scalar(newCVREF(0,scalar($2))))); dep();}
| LOOPEX
{ $$ = newOP($1, OPf_SPECIAL);
hints |= HINT_BLOCK_SCOPE; }
| LOOPEX term
{ $$ = newLOOPEX($1,$2); }
| NOTOP argexpr
{ $$ = newUNOP(OP_NOT, 0, scalar($2)); }
| UNIOP
{ $$ = newOP($1, 0); }
| UNIOP block
{ $$ = newUNOP($1, 0, $2); }
| UNIOP term
{ $$ = newUNOP($1, 0, $2); }
| UNIOPSUB term
{ $$ = newUNOP(OP_ENTERSUB, OPf_STACKED,
append_elem(OP_LIST, $2, scalar($1))); }
| FUNC0
{ $$ = newOP($1, 0); }
| FUNC0 '(' ')'
{ $$ = newOP($1, 0); }
| FUNC0SUB
{ $$ = newUNOP(OP_ENTERSUB, 0,
scalar($1)); }
| FUNC1 '(' ')'
{ $$ = newOP($1, OPf_SPECIAL); }
| FUNC1 '(' expr ')'
{ $$ = newUNOP($1, 0, $3); }
| PMFUNC '(' term ')'
{ $$ = pmruntime($1, $3, Nullop); }
| PMFUNC '(' term ',' term ')'
{ $$ = pmruntime($1, $3, $5); }
| WORD
| listop
;
listexpr: /* NULL */
{ $$ = Nullop; }
| argexpr
{ $$ = $1; }
;
listexprcom: /* NULL */
{ $$ = Nullop; }
| expr
{ $$ = $1; }
| expr ','
{ $$ = $1; }
;
amper : '&' indirob
{ $$ = newCVREF($1,$2); }
;
scalar : '$' indirob
{ $$ = newSVREF($2); }
;
ary : '@' indirob
{ $$ = newAVREF($2); }
;
hsh : '%' indirob
{ $$ = newHVREF($2); }
;
arylen : DOLSHARP indirob
{ $$ = newAVREF($2); }
;
star : '*' indirob
{ $$ = newGVREF(0,$2); }
;
indirob : WORD
{ $$ = scalar($1); }
| scalar
{ $$ = scalar($1); }
| block
{ $$ = scope($1); }
| PRIVATEREF
{ $$ = $1; }
;
%% /* PROGRAM */