1 /**************************************************************************
4 * Author: Maria M. Gutierrez *
5 * Modified by: Kevin Hammond *
6 * Last date revised: December 13 1991. KH. *
7 * Modification: Haskell 1.1 Syntax. *
10 * Description: This file contains the LALR(1) grammar for Haskell. *
12 * Entry Point: module *
14 * Problems: None known. *
17 * LALR(1) Syntax for Haskell 1.2 *
19 **************************************************************************/
31 #include "constants.h"
34 /**********************************************************************
37 * Imported Variables and Functions *
40 **********************************************************************/
42 static BOOLEAN expect_ccurly = FALSE; /* Used to signal that a CCURLY could be inserted here */
45 extern char *input_filename;
46 static char *the_module_name;
47 static maybe module_exports;
50 extern list reverse_list();
53 /* For FN, PREVPATT and SAMEFN macros */
55 extern BOOLEAN samefn[];
56 extern tree prevpatt[];
57 extern short icontexts;
60 extern int hsplineno, hspcolno;
61 extern int modulelineno;
62 extern int startlineno;
65 /**********************************************************************
68 * Fixity and Precedence Declarations *
71 **********************************************************************/
73 static int Fixity = 0, Precedence = 0;
75 char *ineg PROTO((char *));
77 long source_version = 0;
102 /**********************************************************************
105 * These are lexemes. *
108 **********************************************************************/
111 %token VARID CONID QVARID QCONID
112 VARSYM CONSYM QVARSYM QCONSYM
114 %token INTEGER FLOAT CHAR STRING
115 CHARPRIM STRINGPRIM INTPRIM FLOATPRIM
120 /**********************************************************************
126 **********************************************************************/
128 %token OCURLY CCURLY VCCURLY
129 %token COMMA SEMI OBRACK CBRACK
130 %token WILDCARD BQUOTE OPAREN CPAREN
133 /**********************************************************************
136 * Reserved Operators *
139 **********************************************************************/
141 %token DOTDOT DCOLON EQUAL LAMBDA
142 %token VBAR RARROW LARROW
143 %token AT LAZY DARROW
146 /**********************************************************************
149 * Reserved Identifiers *
152 **********************************************************************/
154 %token CASE CLASS DATA
155 %token DEFAULT DERIVING DO
156 %token ELSE IF IMPORT
157 %token IN INFIX INFIXL
158 %token INFIXR INSTANCE LET
159 %token MODULE NEWTYPE OF
160 %token THEN TYPE WHERE
163 %token CCALL CCALL_GC CASM CASM_GC
166 /**********************************************************************
169 * Special symbols/identifiers which need to be recognised *
172 **********************************************************************/
174 %token MINUS BANG PLUS
175 %token AS HIDING QUALIFIED
178 /**********************************************************************
181 * Special Symbols for the Lexer *
184 **********************************************************************/
186 %token INTERFACE_UPRAGMA SPECIALISE_UPRAGMA
187 %token INLINE_UPRAGMA MAGIC_UNFOLDING_UPRAGMA
189 %token SOURCE_UPRAGMA
191 /**********************************************************************
194 * Precedences of the various tokens *
197 **********************************************************************/
202 SCC CASM CCALL CASM_GC CCALL_GC
204 %left VARSYM CONSYM QVARSYM QCONSYM
205 MINUS BQUOTE BANG DARROW PLUS
211 %left OCURLY OBRACK OPAREN
217 /**********************************************************************
220 * Type Declarations *
223 **********************************************************************/
226 %type <ulist> caserest alts alt quals
228 rbinds rbinds1 rpats rpats1 list_exps list_rest
230 constrs constr1 fields
233 pats simple_context simple_context_list
236 impdecls maybeimpdecls impdecl
237 maybefixes fixes fix ops
242 %type <umaybe> maybeexports impspec deriving
244 %type <uliteral> lit_constant
246 %type <utree> exp oexp dexp kexp fexp aexp rbind texps
247 expL oexpL kexpL expLno oexpLno dexpLno kexpLno
248 vallhs funlhs qual leftexp
249 pat cpat bpat apat apatc conpat rpat
250 patk bpatk apatck conpatk
253 %type <uid> MINUS PLUS DARROW AS LAZY
254 VARID CONID VARSYM CONSYM
255 var con varop conop op
256 vark varid varsym varsym_nominus
259 %type <uqid> QVARID QCONID QVARSYM QCONSYM
260 qvarid qconid qvarsym qconsym
261 qvar qcon qvarop qconop qop
262 qvark qconk qtycon qtycls
263 gcon gconk gtycon itycon qop1 qvarop1
266 %type <ubinding> topdecl topdecls letdecls
267 typed datad newtd classd instd defaultd
268 decl decls valdef instdef instdefs
269 maybe_where cbody rinst type_and_maybe_id
271 %type <upbinding> valrhs1 altrest
273 %type <uttype> ctype sigtype sigarrowtype type atype bigatype btype
274 bbtype batype bxtype wierd_atype
275 simple_con_app simple_con_app1 tyvar contype inst_type
277 %type <uconstr> constr constr_after_context field
279 %type <ustring> FLOAT INTEGER INTPRIM
280 FLOATPRIM DOUBLEPRIM CLITLIT
282 %type <uhstring> STRING STRINGPRIM CHAR CHARPRIM
284 %type <uentid> export import
286 %type <ulong> commas importkey get_line_no
288 /**********************************************************************
291 * Start Symbol for the Parser *
294 **********************************************************************/
299 module : modulekey modid maybeexports
301 modulelineno = startlineno;
302 the_module_name = $2;
308 the_module_name = install_literal("Main");
309 module_exports = mknothing();
314 body : ocurly { setstartlineno(); } interface_pragma orestm
315 | vocurly interface_pragma vrestm
318 interface_pragma : /* empty */
319 | INTERFACE_UPRAGMA INTEGER END_UPRAGMA SEMI
321 source_version = atoi($2);
325 orestm : maybeimpdecls maybefixes topdecls ccurly
327 root = mkhmodule(the_module_name,$1,module_exports,
328 $2,$3,source_version,modulelineno);
332 root = mkhmodule(the_module_name,$1,module_exports,
333 Lnil,mknullbind(),source_version,modulelineno);
336 vrestm : maybeimpdecls maybefixes topdecls vccurly
338 root = mkhmodule(the_module_name,$1,module_exports,
339 $2,$3,source_version,modulelineno);
343 root = mkhmodule(the_module_name,$1,module_exports,
344 Lnil,mknullbind(),source_version,modulelineno);
347 maybeexports : /* empty */ { $$ = mknothing(); }
348 | OPAREN export_list CPAREN { $$ = mkjust($2); }
349 | OPAREN export_list COMMA CPAREN { $$ = mkjust($2); }
353 export { $$ = lsing($1); }
354 | export_list COMMA export { $$ = lapp($1, $3); }
357 export : qvar { $$ = mkentid($1); }
358 | gtycon { $$ = mkenttype($1); }
359 | gtycon OPAREN DOTDOT CPAREN { $$ = mkenttypeall($1); }
360 | gtycon OPAREN CPAREN { $$ = mkenttypenamed($1,Lnil); }
361 | gtycon OPAREN enames CPAREN { $$ = mkenttypenamed($1,$3); }
362 | MODULE modid { $$ = mkentmod($2); }
365 enames : ename { $$ = lsing($1); }
366 | enames COMMA ename { $$ = lapp($1,$3); }
373 maybeimpdecls : /* empty */ { $$ = Lnil; }
374 | impdecls SEMI { $$ = $1; }
377 impdecls: impdecl { $$ = $1; }
378 | impdecls SEMI impdecl { $$ = lconc($1,$3); }
382 impdecl : importkey modid impspec
383 { $$ = lsing(mkimport($2,0,mknothing(),$3,$1,startlineno)); }
384 | importkey QUALIFIED modid impspec
385 { $$ = lsing(mkimport($3,1,mknothing(),$4,$1,startlineno)); }
386 | importkey QUALIFIED modid AS modid impspec
387 { $$ = lsing(mkimport($3,1,mkjust($5),$6,$1,startlineno)); }
388 | importkey modid AS modid impspec
389 { $$ = lsing(mkimport($3,1,mkjust($4),$5,$1,startlineno)); }
392 impspec : /* empty */ { $$ = mknothing(); }
393 | OPAREN CPAREN { $$ = mkjust(mkleft(Lnil)); }
394 | OPAREN import_list CPAREN { $$ = mkjust(mkleft($2)); }
395 | OPAREN import_list COMMA CPAREN { $$ = mkjust(mkleft($2)); }
396 | HIDING OPAREN import_list CPAREN { $$ = mkjust(mkright($3)); }
397 | HIDING OPAREN import_list COMMA CPAREN { $$ = mkjust(mkright($3)); }
401 import { $$ = lsing($1); }
402 | import_list COMMA import { $$ = lapp($1, $3); }
405 import : var { $$ = mkentid(mknoqual($1)); }
406 | itycon { $$ = mkenttype($1); }
407 | itycon OPAREN DOTDOT CPAREN { $$ = mkenttypeall($1); }
408 | itycon OPAREN CPAREN { $$ = mkenttypenamed($1,Lnil);}
409 | itycon OPAREN inames CPAREN { $$ = mkenttypenamed($1,$3); }
412 itycon : tycon { $$ = mknoqual($1); }
413 | OBRACK CBRACK { $$ = creategid(NILGID); }
414 | OPAREN CPAREN { $$ = creategid(UNITGID); }
415 | OPAREN commas CPAREN { $$ = creategid($2); }
418 inames : iname { $$ = lsing($1); }
419 | inames COMMA iname { $$ = lapp($1,$3); }
421 iname : var { $$ = mknoqual($1); }
422 | con { $$ = mknoqual($1); }
425 /**********************************************************************
428 * Fixes and Decls etc *
431 **********************************************************************/
433 maybefixes: /* empty */ { $$ = Lnil; }
434 | fixes SEMI { $$ = $1; }
437 fixes : fix { $$ = $1; }
438 | fixes SEMI fix { $$ = lconc($1,$3); }
441 fix : INFIXL INTEGER { Precedence = checkfixity($2); Fixity = INFIXL; }
443 | INFIXR INTEGER { Precedence = checkfixity($2); Fixity = INFIXR; }
445 | INFIX INTEGER { Precedence = checkfixity($2); Fixity = INFIX; }
447 | INFIXL { Fixity = INFIXL; Precedence = 9; }
449 | INFIXR { Fixity = INFIXR; Precedence = 9; }
451 | INFIX { Fixity = INFIX; Precedence = 9; }
455 ops : op { $$ = lsing(mkfixop(mknoqual($1),infixint(Fixity),Precedence,startlineno)); }
456 | ops COMMA op { $$ = lapp($1,mkfixop(mknoqual($3),infixint(Fixity),Precedence,startlineno)); }
460 | topdecls SEMI topdecl
479 topdecl : typed { $$ = $1; FN = NULL; SAMEFN = 0; }
480 | datad { $$ = $1; FN = NULL; SAMEFN = 0; }
481 | newtd { $$ = $1; FN = NULL; SAMEFN = 0; }
482 | classd { $$ = $1; FN = NULL; SAMEFN = 0; }
483 | instd { $$ = $1; FN = NULL; SAMEFN = 0; }
484 | defaultd { $$ = $1; FN = NULL; SAMEFN = 0; }
488 typed : typekey simple_con_app EQUAL type { $$ = mknbind($2,$4,startlineno); }
492 datad : datakey simple_con_app EQUAL constrs deriving
493 { $$ = mktbind(Lnil,$2,$4,$5,startlineno); }
494 | datakey simple_context DARROW simple_con_app EQUAL constrs deriving
495 { $$ = mktbind($2,$4,$6,$7,startlineno); }
498 newtd : newtypekey simple_con_app EQUAL constr1 deriving
499 { $$ = mkntbind(Lnil,$2,$4,$5,startlineno); }
500 | newtypekey simple_context DARROW simple_con_app EQUAL constr1 deriving
501 { $$ = mkntbind($2,$4,$6,$7,startlineno); }
504 deriving: /* empty */ { $$ = mknothing(); }
505 | DERIVING dtyclses { $$ = mkjust($2); }
508 classd : classkey simple_context DARROW simple_con_app1 cbody
509 { $$ = mkcbind($2,$4,$5,startlineno); }
510 | classkey simple_con_app1 cbody
511 { $$ = mkcbind(Lnil,$2,$3,startlineno); }
514 cbody : /* empty */ { $$ = mknullbind(); }
515 | WHERE ocurly decls ccurly { checkorder($3); $$ = $3; }
516 | WHERE vocurly decls vccurly { checkorder($3); $$ = $3; }
519 instd : instkey inst_type rinst { $$ = mkibind($2,$3,startlineno); }
523 inst_type : type DARROW type { is_context_format( $3, 0 ); /* Check the instance head */
524 $$ = mkcontext(type2context($1),$3); }
525 | type { is_context_format( $1, 0 ); /* Check the instance head */
530 rinst : /* empty */ { $$ = mknullbind(); }
531 | WHERE ocurly instdefs ccurly { $$ = $3; }
532 | WHERE vocurly instdefs vccurly { $$ = $3; }
535 defaultd: defaultkey OPAREN types CPAREN { $$ = mkdbind($3,startlineno); }
536 | defaultkey OPAREN CPAREN { $$ = mkdbind(Lnil,startlineno); }
553 Note: if there is an iclasop_pragma here, then we must be
554 doing a class-op in an interface -- unless the user is up
555 to real mischief (ugly, but likely to work).
558 decl : qvarsk DCOLON sigtype
559 { $$ = mksbind($1,$3,startlineno);
560 PREVPATT = NULL; FN = NULL; SAMEFN = 0;
563 /* User-specified pragmas come in as "signatures"...
564 They are similar in that they can appear anywhere in the module,
565 and have to be "joined up" with their related entity.
567 Have left out the case specialising to an overloaded type.
568 Let's get real, OK? (WDP)
570 | SPECIALISE_UPRAGMA qvark DCOLON types_and_maybe_ids END_UPRAGMA
572 $$ = mkvspec_uprag($2, $4, startlineno);
573 PREVPATT = NULL; FN = NULL; SAMEFN = 0;
576 | SPECIALISE_UPRAGMA INSTANCE gtycon atype END_UPRAGMA
578 $$ = mkispec_uprag($3, $4, startlineno);
579 PREVPATT = NULL; FN = NULL; SAMEFN = 0;
582 | SPECIALISE_UPRAGMA DATA gtycon atypes END_UPRAGMA
584 $$ = mkdspec_uprag($3, $4, startlineno);
585 PREVPATT = NULL; FN = NULL; SAMEFN = 0;
588 | INLINE_UPRAGMA qvark END_UPRAGMA
590 $$ = mkinline_uprag($2, startlineno);
591 PREVPATT = NULL; FN = NULL; SAMEFN = 0;
594 | MAGIC_UNFOLDING_UPRAGMA qvark vark END_UPRAGMA
596 $$ = mkmagicuf_uprag($2, $3, startlineno);
597 PREVPATT = NULL; FN = NULL; SAMEFN = 0;
600 /* end of user-specified pragmas */
603 | /* empty */ { $$ = mknullbind(); PREVPATT = NULL; FN = NULL; SAMEFN = 0; }
606 qvarsk : qvark COMMA qvars_list { $$ = mklcons($1,$3); }
607 | qvark { $$ = lsing($1); }
610 qvars_list: qvar { $$ = lsing($1); }
611 | qvars_list COMMA qvar { $$ = lapp($1,$3); }
614 types_and_maybe_ids :
615 type_and_maybe_id { $$ = lsing($1); }
616 | types_and_maybe_ids COMMA type_and_maybe_id { $$ = lapp($1,$3); }
620 type { $$ = mkvspec_ty_and_id($1,mknothing()); }
621 | type EQUAL qvark { $$ = mkvspec_ty_and_id($1,mkjust($3)); }
624 /**********************************************************************
630 **********************************************************************/
632 /* "DCOLON context => type" vs "DCOLON type" is a problem,
633 because you can't distinguish between
635 foo :: (Baz a, Baz a)
636 bar :: (Baz a, Baz a) => [a] -> [a] -> [a]
638 with one token of lookahead. The HACK is to have "DCOLON ttype"
639 [tuple type] in the first case, then check that it has the right
640 form C a, or (C1 a, C2 b, ... Cn z) and convert it into a
644 /* A sigtype is a rank 2 type; it can have for-alls as function args:
645 f :: All a => (All b => ...) -> Int
647 sigtype : type DARROW sigarrowtype { $$ = mkcontext(type2context($1),$3); }
651 sigarrowtype : bigatype RARROW sigarrowtype { $$ = mktfun($1,$3); }
652 | btype RARROW sigarrowtype { $$ = mktfun($1,$3); }
656 /* A "big" atype can be a forall-type in brackets. */
657 bigatype: OPAREN type DARROW type CPAREN { $$ = mkcontext(type2context($2),$4); }
660 /* 1 S/R conflict at DARROW -> shift */
661 ctype : type DARROW type { $$ = mkcontext(type2context($1),$3); }
665 /* 1 S/R conflict at RARROW -> shift */
666 type : btype RARROW type { $$ = mktfun($1,$3); }
670 btype : btype atype { $$ = mktapp($1,$2); }
674 atype : gtycon { $$ = mktname($1); }
676 | OPAREN type COMMA types CPAREN { $$ = mkttuple(mklcons($2,$4)); }
677 | OBRACK type CBRACK { $$ = mktllist($2); }
678 | OPAREN type CPAREN { $$ = $2; }
682 | OPAREN RARROW CPAREN { $$ = creategid(ARROWGID); }
683 | OBRACK CBRACK { $$ = creategid(NILGID); }
684 | OPAREN CPAREN { $$ = creategid(UNITGID); }
685 | OPAREN commas CPAREN { $$ = creategid($2); }
688 atypes : atype { $$ = lsing($1); }
689 | atypes atype { $$ = lapp($1,$2); }
692 types : type { $$ = lsing($1); }
693 | types COMMA type { $$ = lapp($1,$3); }
696 commas : COMMA { $$ = 1; }
697 | commas COMMA { $$ = $1 + 1; }
700 /**********************************************************************
703 * Declaration stuff *
706 **********************************************************************/
708 /* C a b c, where a,b,c are type variables */
709 /* C can be a class or tycon */
710 simple_con_app: gtycon { $$ = mktname($1); }
711 | simple_con_app1 { $$ = $1; }
714 simple_con_app1: gtycon tyvar { $$ = mktapp(mktname($1),$2); }
715 | simple_con_app tyvar { $$ = mktapp($1, $2); }
718 simple_context : OPAREN simple_context_list CPAREN { $$ = $2; }
719 | simple_con_app1 { $$ = lsing($1); }
722 simple_context_list: simple_con_app1 { $$ = lsing($1); }
723 | simple_context_list COMMA simple_con_app1 { $$ = lapp($1,$3); }
726 constrs : constr { $$ = lsing($1); }
727 | constrs VBAR constr { $$ = lapp($1,$3); }
730 constr : constr_after_context
731 | type DARROW constr_after_context { $$ = mkconstrcxt ( type2context($1), $3 ); }
734 constr_after_context :
736 /* We have to parse the constructor application as a *type*, else we get
737 into terrible ambiguity problems. Consider the difference between
739 data T = S Int Int Int `R` Int
741 data T = S Int Int Int
743 It isn't till we get to the operator that we discover that the "S" is
744 part of a type in the first, but part of a constructor application in the
748 /* Con !Int (Tree a) */
749 contype { qid tyc; list tys;
750 splittyconapp($1, &tyc, &tys);
751 $$ = mkconstrpre(tyc,tys,hsplineno); }
753 /* !Int `Con` Tree a */
754 | bbtype qconop bbtype { $$ = mkconstrinf($1,$2,$3,hsplineno); }
756 /* (::) (Tree a) Int */
757 | OPAREN qconsym CPAREN batypes { $$ = mkconstrpre($2,$4,hsplineno); }
759 /* Con { op1 :: Int } */
760 | qtycon OCURLY fields CCURLY { $$ = mkconstrrec($1,$3,hsplineno); }
761 | OPAREN qconsym CPAREN OCURLY fields CCURLY { $$ = mkconstrrec($2,$5,hsplineno); }
763 /* 1 S/R conflict on OCURLY -> shift */
766 /* contype has to reduce to a btype unless there are !'s, so that
767 we don't get reduce/reduce conflicts with the second production of constr.
768 But as soon as we see a ! we must switch to using bxtype. */
770 contype : btype { $$ = $1; }
771 | bxtype { $$ = $1; }
774 /* S !Int Bool; at least one ! */
775 bxtype : btype wierd_atype { $$ = mktapp($1, $2); }
776 | bxtype batype { $$ = mktapp($1, $2); }
779 bbtype : btype { $$ = $1; }
780 | wierd_atype { $$ = $1; }
783 batype : atype { $$ = $1; }
784 | wierd_atype { $$ = $1; }
787 /* A wierd atype is one that isn't a regular atype;
788 it starts with a "!", or with a forall. */
789 wierd_atype : BANG bigatype { $$ = mktbang( $2 ); }
790 | BANG atype { $$ = mktbang( $2 ); }
794 batypes : { $$ = Lnil; }
795 | batypes batype { $$ = lapp($1,$2); }
799 fields : field { $$ = lsing($1); }
800 | fields COMMA field { $$ = lapp($1,$3); }
803 field : qvars_list DCOLON ctype { $$ = mkfield($1,$3); }
804 | qvars_list DCOLON BANG atype { $$ = mkfield($1,mktbang($4)); }
805 | qvars_list DCOLON BANG bigatype { $$ = mkfield($1,mktbang($4)); }
808 constr1 : gtycon atype { $$ = lsing(mkconstrnew($1,$2,hsplineno)); }
812 dtyclses: OPAREN dtycls_list CPAREN { $$ = $2; }
813 | OPAREN CPAREN { $$ = Lnil; }
814 | qtycls { $$ = lsing($1); }
817 dtycls_list: qtycls { $$ = lsing($1); }
818 | dtycls_list COMMA qtycls { $$ = lapp($1,$3); }
821 instdefs : /* empty */ { $$ = mknullbind(); }
822 | instdef { $$ = $1; }
823 | instdefs SEMI instdef
835 /* instdef: same as valdef, except certain user-pragmas may appear */
837 SPECIALISE_UPRAGMA qvark DCOLON types_and_maybe_ids END_UPRAGMA
839 $$ = mkvspec_uprag($2, $4, startlineno);
840 PREVPATT = NULL; FN = NULL; SAMEFN = 0;
843 | INLINE_UPRAGMA qvark END_UPRAGMA
845 $$ = mkinline_uprag($2, startlineno);
846 PREVPATT = NULL; FN = NULL; SAMEFN = 0;
849 | MAGIC_UNFOLDING_UPRAGMA qvark vark END_UPRAGMA
851 $$ = mkmagicuf_uprag($2, $3, startlineno);
852 PREVPATT = NULL; FN = NULL; SAMEFN = 0;
862 tree fn = function($1);
865 if(ttree(fn) == ident)
867 qid fun_id = gident((struct Sident *) fn);
872 else if (ttree(fn) == infixap)
874 qid fun_id = ginffun((struct Sinfixap *) fn);
881 printf("%u\n",startlineno);
883 fprintf(stderr,"%u\tvaldef\n",startlineno);
890 if ( lhs_is_patt($1) )
892 $$ = mkpbind($4, $3);
897 $$ = mkfbind($4, $3);
903 get_line_no : { $$ = startlineno; }
906 vallhs : patk { $$ = $1; }
907 | patk qvarop pat { $$ = mkinfixap($2,$1,$3); }
908 | funlhs { $$ = $1; }
911 funlhs : qvark apat { $$ = mkap(mkident($1),$2); }
912 | funlhs apat { $$ = mkap($1,$2); }
916 valrhs : valrhs1 maybe_where { $$ = lsing(createpat($1, $2)); }
919 valrhs1 : gdrhs { $$ = mkpguards($1); }
920 | EQUAL exp { $$ = mkpnoguards($2); }
923 gdrhs : gd EQUAL exp { $$ = lsing(mkpgdexp($1,$3)); }
924 | gd EQUAL exp gdrhs { $$ = mklcons(mkpgdexp($1,$3),$4); }
928 WHERE ocurly decls ccurly { $$ = $3; }
929 | WHERE vocurly decls vccurly { $$ = $3; }
930 /* A where containing no decls is OK */
931 | WHERE SEMI { $$ = mknullbind(); }
932 | /* empty */ { $$ = mknullbind(); }
935 gd : VBAR quals { $$ = $2; }
939 /**********************************************************************
945 **********************************************************************/
947 exp : oexp DCOLON ctype { $$ = mkrestr($1,$3); }
952 Operators must be left-associative at the same precedence for
953 precedence parsing to work.
955 /* 8 S/R conflicts on qop -> shift */
956 oexp : oexp qop oexp %prec MINUS { $$ = mkinfixap($2,$1,$3); }
961 This comes here because of the funny precedence rules concerning
964 dexp : MINUS kexp { $$ = mknegate($2); }
969 We need to factor out a leading let expression so we can set
970 inpat=TRUE when parsing (non let) expressions inside stmts and quals
972 expLno : oexpLno DCOLON ctype { $$ = mkrestr($1,$3); }
975 oexpLno : oexpLno qop oexp %prec MINUS { $$ = mkinfixap($2,$1,$3); }
978 dexpLno : MINUS kexp { $$ = mknegate($2); }
982 expL : oexpL DCOLON ctype { $$ = mkrestr($1,$3); }
985 oexpL : oexpL qop oexp %prec MINUS { $$ = mkinfixap($2,$1,$3); }
990 let/if/lambda/case have higher precedence than infix operators.
997 /* kexpL = a let expression */
998 kexpL : letdecls IN exp { $$ = mklet($1,$3); }
1001 /* kexpLno = any other expression more tightly binding than operator application */
1003 { hsincindent(); /* push new context for FN = NULL; */
1004 FN = NULL; /* not actually concerned about indenting */
1005 $<ulong>$ = hsplineno; /* remember current line number */
1010 RARROW exp /* lambda abstraction */
1012 $$ = mklambda($3, $6, $<ulong>2);
1016 | IF {$<ulong>$ = hsplineno;}
1017 exp THEN exp ELSE exp { $$ = mkife($3,$5,$7,$<ulong>2); }
1019 /* Case Expression */
1020 | CASE {$<ulong>$ = hsplineno;}
1021 exp OF caserest { $$ = mkcasee($3,$5,$<ulong>2); }
1024 | DO {$<ulong>$ = hsplineno;}
1025 dorest { $$ = mkdoe($3,$<ulong>2); }
1027 /* CCALL/CASM Expression */
1028 | CCALL ccallid cexps { $$ = mkccall($2,install_literal("n"),$3); }
1029 | CCALL ccallid { $$ = mkccall($2,install_literal("n"),Lnil); }
1030 | CCALL_GC ccallid cexps { $$ = mkccall($2,install_literal("p"),$3); }
1031 | CCALL_GC ccallid { $$ = mkccall($2,install_literal("p"),Lnil); }
1032 | CASM CLITLIT cexps { $$ = mkccall($2,install_literal("N"),$3); }
1033 | CASM CLITLIT { $$ = mkccall($2,install_literal("N"),Lnil); }
1034 | CASM_GC CLITLIT cexps { $$ = mkccall($2,install_literal("P"),$3); }
1035 | CASM_GC CLITLIT { $$ = mkccall($2,install_literal("P"),Lnil); }
1037 /* SCC Expression */
1042 "\"%s\":%d: _scc_ (`set [profiling] cost centre') ignored\n",
1043 input_filename, hsplineno);
1045 $$ = mkpar($3); /* Note the mkpar(). If we don't have it, then
1046 (x >> _scc_ y >> z) parses as (x >> (y >> z)),
1047 right associated. But the precedence reorganiser expects
1048 the parser to *left* associate all operators unless there
1049 are explicit parens. The _scc_ acts like an explicit paren,
1050 so if we omit it we'd better add explicit parens instead. */
1058 fexp : fexp aexp { $$ = mkap($1,$2); }
1062 /* simple expressions */
1063 aexp : qvar { $$ = mkident($1); }
1064 | gcon { $$ = mkident($1); }
1065 | lit_constant { $$ = mklit($1); }
1066 | OPAREN exp CPAREN { $$ = mkpar($2); } /* mkpar: stop infix parsing at ()'s */
1067 | qcon OCURLY rbinds CCURLY { $$ = mkrecord($1,$3); } /* 1 S/R conflict on OCURLY -> shift */
1068 | OBRACK list_exps CBRACK { $$ = mkllist($2); }
1069 | OPAREN exp COMMA texps CPAREN { if (ttree($4) == tuple)
1070 $$ = mktuple(mklcons($2, gtuplelist((struct Stuple *) $4)));
1072 $$ = mktuple(ldub($2, $4)); }
1074 /* only in expressions ... */
1075 | aexp OCURLY rbinds1 CCURLY { $$ = mkrupdate($1,$3); }
1076 | OBRACK exp VBAR quals CBRACK { $$ = mkcomprh($2,$4); }
1077 | OBRACK exp COMMA exp DOTDOT exp CBRACK {$$= mkeenum($2,mkjust($4),mkjust($6)); }
1078 | OBRACK exp COMMA exp DOTDOT CBRACK { $$ = mkeenum($2,mkjust($4),mknothing()); }
1079 | OBRACK exp DOTDOT exp CBRACK { $$ = mkeenum($2,mknothing(),mkjust($4)); }
1080 | OBRACK exp DOTDOT CBRACK { $$ = mkeenum($2,mknothing(),mknothing()); }
1081 | OPAREN oexp qop CPAREN { $$ = mklsection($2,$3); }
1082 | OPAREN qop1 oexp CPAREN { $$ = mkrsection($2,$3); }
1084 /* only in patterns ... */
1085 /* these add 2 S/R conflict with with aexp . OCURLY rbinds CCURLY */
1086 | qvar AT aexp { checkinpat(); $$ = mkas($1,$3); }
1087 | LAZY aexp { checkinpat(); $$ = mklazyp($2); }
1088 | WILDCARD { checkinpat(); $$ = mkwildp(); }
1091 /* ccall arguments */
1092 cexps : cexps aexp { $$ = lapp($1,$2); }
1093 | aexp { $$ = lsing($1); }
1096 caserest: ocurly alts ccurly { $$ = $2; }
1097 | vocurly alts vccurly { $$ = $2; }
1099 dorest : ocurly stmts ccurly { checkdostmts($2); $$ = $2; }
1100 | vocurly stmts vccurly { checkdostmts($2); $$ = $2; }
1103 rbinds : /* empty */ { $$ = Lnil; }
1107 rbinds1 : rbind { $$ = lsing($1); }
1108 | rbinds1 COMMA rbind { $$ = lapp($1,$3); }
1111 rbind : qvar { $$ = mkrbind($1,mknothing()); }
1112 | qvar EQUAL exp { $$ = mkrbind($1,mkjust($3)); }
1115 texps : exp { $$ = mkpar($1); } /* mkpar: so we don't flatten last element in tuple */
1117 { if (ttree($3) == tuple)
1118 $$ = mktuple(mklcons($1, gtuplelist((struct Stuple *) $3)));
1119 else if (ttree($3) == par)
1120 $$ = mktuple(ldub($1, gpare((struct Spar *) $3)));
1122 hsperror("hsparser:texps: panic");
1124 /* right recursion? WDP */
1128 exp { $$ = lsing($1); }
1129 | exp COMMA exp { $$ = mklcons( $1, lsing($3) ); }
1130 | exp COMMA exp COMMA list_rest { $$ = mklcons( $1, mklcons( $3, reverse_list( $5 ))); }
1133 /* Use left recusion for list_rest, because we sometimes get programs with
1134 very long explicit lists. */
1135 list_rest : exp { $$ = lsing($1); }
1136 | list_rest COMMA exp { $$ = mklcons( $3, $1 ); }
1140 exp { $$ = lsing($1); }
1141 | exp COMMA list_exps { $$ = mklcons($1, $3); }
1143 /* right recursion? (WDP)
1145 It has to be this way, though, otherwise you
1146 may do the wrong thing to distinguish between...
1148 [ e1 , e2 .. ] -- an enumeration ...
1149 [ e1 , e2 , e3 ] -- a list
1151 (In fact, if you change the grammar and throw yacc/bison
1152 at it, it *will* do the wrong thing [WDP 94/06])
1155 letdecls: LET ocurly decls ccurly { $$ = $3; }
1156 | LET vocurly decls vccurly { $$ = $3; }
1159 quals : qual { $$ = lsing($1); }
1160 | quals COMMA qual { $$ = lapp($1,$3); }
1163 qual : letdecls { $$ = mkseqlet($1); }
1165 | {inpat=TRUE;} expLno
1166 {inpat=FALSE;} leftexp
1168 expORpat(LEGIT_EXPR,$2);
1171 expORpat(LEGIT_PATT,$2);
1177 alts : alt { $$ = $1; }
1178 | alts SEMI alt { $$ = lconc($1,$3); }
1181 alt : pat { PREVPATT = $1; } altrest { $$ = lsing($3); PREVPATT = NULL; }
1182 | /* empty */ { $$ = Lnil; }
1185 altrest : gdpat maybe_where { $$ = createpat(mkpguards($1), $2); }
1186 | RARROW exp maybe_where { $$ = createpat(mkpnoguards($2),$3); }
1189 gdpat : gd RARROW exp { $$ = lsing(mkpgdexp($1,$3)); }
1190 | gd RARROW exp gdpat { $$ = mklcons(mkpgdexp($1,$3),$4); }
1193 stmts : stmt { $$ = $1; }
1194 | stmts SEMI stmt { $$ = lconc($1,$3); }
1197 stmt : /* empty */ { $$ = Lnil; }
1198 | letdecls { $$ = lsing(mkseqlet($1)); }
1199 | expL { $$ = lsing(mkdoexp($1,hsplineno)); }
1200 | {inpat=TRUE;} expLno {inpat=FALSE;} leftexp
1202 expORpat(LEGIT_EXPR,$2);
1203 $$ = lsing(mkdoexp($2,endlineno));
1205 expORpat(LEGIT_PATT,$2);
1206 $$ = lsing(mkdobind($2,$4,endlineno));
1211 leftexp : LARROW exp { $$ = $2; }
1212 | /* empty */ { $$ = NULL; }
1215 /**********************************************************************
1221 **********************************************************************/
1223 pat : qvar PLUS INTEGER { $$ = mkplusp($1, mkinteger($3)); }
1227 cpat : cpat qconop bpat { $$ = mkinfixap($2,$1,$3); }
1233 | qcon OCURLY rpats CCURLY { $$ = mkrecord($1,$3); }
1234 | MINUS INTEGER { $$ = mknegate(mklit(mkinteger($2))); }
1235 | MINUS FLOAT { $$ = mknegate(mklit(mkfloatr($2))); }
1238 conpat : gcon { $$ = mkident($1); }
1239 | conpat apat { $$ = mkap($1,$2); }
1242 apat : gcon { $$ = mkident($1); }
1243 | qcon OCURLY rpats CCURLY { $$ = mkrecord($1,$3); }
1247 apatc : qvar { $$ = mkident($1); }
1248 | qvar AT apat { $$ = mkas($1,$3); }
1249 | lit_constant { $$ = mklit($1); }
1250 | WILDCARD { $$ = mkwildp(); }
1251 | OPAREN pat CPAREN { $$ = mkpar($2); }
1252 | OPAREN pat COMMA pats CPAREN { $$ = mktuple(mklcons($2,$4)); }
1253 | OBRACK pats CBRACK { $$ = mkllist($2); }
1254 | LAZY apat { $$ = mklazyp($2); }
1258 INTEGER { $$ = mkinteger($1); }
1259 | FLOAT { $$ = mkfloatr($1); }
1260 | CHAR { $$ = mkcharr($1); }
1261 | STRING { $$ = mkstring($1); }
1262 | CHARPRIM { $$ = mkcharprim($1); }
1263 | STRINGPRIM { $$ = mkstringprim($1); }
1264 | INTPRIM { $$ = mkintprim($1); }
1265 | FLOATPRIM { $$ = mkfloatprim($1); }
1266 | DOUBLEPRIM { $$ = mkdoubleprim($1); }
1267 | CLITLIT /* yurble yurble */ { $$ = mkclitlit($1); }
1270 lampats : apat lampats { $$ = mklcons($1,$2); }
1271 | apat { $$ = lsing($1); }
1272 /* right recursion? (WDP) */
1275 pats : pat COMMA pats { $$ = mklcons($1, $3); }
1276 | pat { $$ = lsing($1); }
1277 /* right recursion? (WDP) */
1280 rpats : /* empty */ { $$ = Lnil; }
1284 rpats1 : rpat { $$ = lsing($1); }
1285 | rpats1 COMMA rpat { $$ = lapp($1,$3); }
1288 rpat : qvar { $$ = mkrbind($1,mknothing()); }
1289 | qvar EQUAL pat { $$ = mkrbind($1,mkjust($3)); }
1293 patk : patk qconop bpat { $$ = mkinfixap($2,$1,$3); }
1299 | qconk OCURLY rpats CCURLY { $$ = mkrecord($1,$3); }
1300 | minuskey INTEGER { $$ = mknegate(mklit(mkinteger($2))); }
1301 | minuskey FLOAT { $$ = mknegate(mklit(mkfloatr($2))); }
1304 conpatk : gconk { $$ = mkident($1); }
1305 | conpatk apat { $$ = mkap($1,$2); }
1308 apatck : qvark { $$ = mkident($1); }
1309 | qvark AT apat { $$ = mkas($1,$3); }
1310 | lit_constant { $$ = mklit($1); setstartlineno(); }
1311 | WILDCARD { $$ = mkwildp(); setstartlineno(); }
1312 | oparenkey pat CPAREN { $$ = mkpar($2); }
1313 | oparenkey pat COMMA pats CPAREN { $$ = mktuple(mklcons($2,$4)); }
1314 | obrackkey pats CBRACK { $$ = mkllist($2); }
1315 | lazykey apat { $$ = mklazyp($2); }
1320 | OBRACK CBRACK { $$ = creategid(NILGID); }
1321 | OPAREN CPAREN { $$ = creategid(UNITGID); }
1322 | OPAREN commas CPAREN { $$ = creategid($2); }
1326 | obrackkey CBRACK { $$ = creategid(NILGID); }
1327 | oparenkey CPAREN { $$ = creategid(UNITGID); }
1328 | oparenkey commas CPAREN { $$ = creategid($2); }
1331 /**********************************************************************
1334 * Keywords which record the line start *
1337 **********************************************************************/
1339 importkey: IMPORT { setstartlineno(); $$ = 0; }
1340 | IMPORT SOURCE_UPRAGMA { setstartlineno(); $$ = 1; }
1343 datakey : DATA { setstartlineno();
1346 printf("%u\n",startlineno);
1348 fprintf(stderr,"%u\tdata\n",startlineno);
1353 typekey : TYPE { setstartlineno();
1356 printf("%u\n",startlineno);
1358 fprintf(stderr,"%u\ttype\n",startlineno);
1363 newtypekey : NEWTYPE { setstartlineno();
1366 printf("%u\n",startlineno);
1368 fprintf(stderr,"%u\tnewtype\n",startlineno);
1373 instkey : INSTANCE { setstartlineno();
1376 printf("%u\n",startlineno);
1379 fprintf(stderr,"%u\tinstance\n",startlineno);
1384 defaultkey: DEFAULT { setstartlineno(); }
1387 classkey: CLASS { setstartlineno();
1390 printf("%u\n",startlineno);
1392 fprintf(stderr,"%u\tclass\n",startlineno);
1397 modulekey: MODULE { setstartlineno();
1400 printf("%u\n",startlineno);
1402 fprintf(stderr,"%u\tmodule\n",startlineno);
1407 oparenkey: OPAREN { setstartlineno(); }
1410 obrackkey: OBRACK { setstartlineno(); }
1413 lazykey : LAZY { setstartlineno(); }
1416 minuskey: MINUS { setstartlineno(); }
1420 /**********************************************************************
1423 * Basic qualified/unqualified ids/ops *
1426 **********************************************************************/
1429 | OPAREN qvarsym CPAREN { $$ = $2; }
1432 | OPAREN qconsym CPAREN { $$ = $2; }
1435 | BQUOTE qvarid BQUOTE { $$ = $2; }
1438 | BQUOTE qconid BQUOTE { $$ = $2; }
1444 /* Non "-" op, used in right sections */
1449 /* Non "-" varop, used in right sections */
1451 | varsym_nominus { $$ = mknoqual($1); }
1452 | BQUOTE qvarid BQUOTE { $$ = $2; }
1457 | OPAREN varsym CPAREN { $$ = $2; }
1459 con : tycon /* using tycon removes conflicts */
1460 | OPAREN CONSYM CPAREN { $$ = $2; }
1463 | BQUOTE varid BQUOTE { $$ = $2; }
1466 | BQUOTE CONID BQUOTE { $$ = $2; }
1472 qvark : qvarid { setstartlineno(); $$ = $1; }
1473 | oparenkey qvarsym CPAREN { $$ = $2; }
1475 qconk : qconid { setstartlineno(); $$ = $1; }
1476 | oparenkey qconsym CPAREN { $$ = $2; }
1478 vark : varid { setstartlineno(); $$ = $1; }
1479 | oparenkey varsym CPAREN { $$ = $2; }
1483 | varid { $$ = mknoqual($1); }
1486 | varsym { $$ = mknoqual($1); }
1489 | tycon { $$ = mknoqual($1); } /* using tycon removes conflicts */
1492 | CONSYM { $$ = mknoqual($1); }
1495 | tycon { $$ = mknoqual($1); } /* using tycon removes conflicts */
1498 | tycon { $$ = mknoqual($1); } /* using tycon removes conflicts */
1501 varsym : varsym_nominus
1502 | MINUS { $$ = install_literal("-"); }
1505 /* PLUS, BANG are valid varsyms */
1506 varsym_nominus : VARSYM
1507 | PLUS { $$ = install_literal("+"); }
1508 | BANG { $$ = install_literal("!"); }
1511 /* AS HIDING QUALIFIED are valid varids */
1513 | AS { $$ = install_literal("as"); }
1514 | HIDING { $$ = install_literal("hiding"); }
1515 | QUALIFIED { $$ = install_literal("qualified"); }
1523 tyvar : varid { $$ = mknamedtvar(mknoqual($1)); }
1531 tyvar_list: tyvar { $$ = lsing($1); }
1532 | tyvar_list COMMA tyvar { $$ = lapp($1,$3); }
1536 /**********************************************************************
1539 * Stuff to do with layout *
1542 **********************************************************************/
1544 ocurly : layout OCURLY { hsincindent(); }
1546 vocurly : layout { hssetindent(); }
1549 layout : { hsindentoff(); }
1555 FN = NULL; SAMEFN = 0; PREVPATT = NULL;
1560 vccurly : { expect_ccurly = 1; } vccurly1 { expect_ccurly = 0; }
1566 FN = NULL; SAMEFN = 0; PREVPATT = NULL;
1572 FN = NULL; SAMEFN = 0; PREVPATT = NULL;
1579 /**********************************************************************
1581 * Error Processing and Reporting *
1583 * (This stuff is here in case we want to use Yacc macros and such.) *
1585 **********************************************************************/
1591 hsperror("pattern syntax used in expression");
1595 /* The parser calls "hsperror" when it sees a
1596 `report this and die' error. It sets the stage
1597 and calls "yyerror".
1599 There should be no direct calls in the parser to
1600 "yyerror", except for the one from "hsperror". Thus,
1601 the only other calls will be from the error productions
1602 introduced by yacc/bison/whatever.
1604 We need to be able to recognise the from-error-production
1605 case, because we sometimes want to say, "Oh, never mind",
1606 because the layout rule kicks into action and may save
1610 static BOOLEAN error_and_I_mean_it = FALSE;
1616 error_and_I_mean_it = TRUE;
1620 extern char *yytext;
1627 /* We want to be able to distinguish 'error'-raised yyerrors
1628 from yyerrors explicitly coded by the parser hacker.
1630 if (expect_ccurly && ! error_and_I_mean_it ) {
1634 fprintf(stderr, "%s:%d:%d: %s on input: ",
1635 input_filename, hsplineno, hspcolno + 1, s);
1637 if (yyleng == 1 && *yytext == '\0')
1638 fprintf(stderr, "<EOF>");
1642 format_string(stderr, (unsigned char *) yytext, yyleng);
1645 fputc('\n', stderr);
1647 /* a common problem */
1648 if (strcmp(yytext, "#") == 0)
1649 fprintf(stderr, "\t(Perhaps you forgot a `-cpp' or `-fglasgow-exts' flag?)\n");
1656 format_string(fp, s, len)
1663 case '\0': fputs("\\NUL", fp); break;
1664 case '\007': fputs("\\a", fp); break;
1665 case '\010': fputs("\\b", fp); break;
1666 case '\011': fputs("\\t", fp); break;
1667 case '\012': fputs("\\n", fp); break;
1668 case '\013': fputs("\\v", fp); break;
1669 case '\014': fputs("\\f", fp); break;
1670 case '\015': fputs("\\r", fp); break;
1671 case '\033': fputs("\\ESC", fp); break;
1672 case '\034': fputs("\\FS", fp); break;
1673 case '\035': fputs("\\GS", fp); break;
1674 case '\036': fputs("\\RS", fp); break;
1675 case '\037': fputs("\\US", fp); break;
1676 case '\177': fputs("\\DEL", fp); break;
1681 fprintf(fp, "\\^%c", *s + '@');