Mercurial > urweb
changeset 242:cc193f680193
Shorthand for multi-binding exp declaration
| author | Adam Chlipala <adamc@hcoop.net> |
|---|---|
| date | Thu, 28 Aug 2008 14:05:47 -0400 |
| parents | 052126db06e7 |
| children | 2b9dfaffb008 |
| files | src/lacweb.grm src/lacweb.lex tests/eargs.lac tests/recBad.lac |
| diffstat | 4 files changed, 28 insertions(+), 4 deletions(-) [+] |
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--- a/src/lacweb.grm Thu Aug 28 13:57:12 2008 -0400 +++ b/src/lacweb.grm Thu Aug 28 14:05:47 2008 -0400 @@ -151,7 +151,7 @@ | LPAREN | RPAREN | LBRACK | RBRACK | LBRACE | RBRACE | EQ | COMMA | COLON | DCOLON | TCOLON | DOT | HASH | UNDER | UNDERUNDER | BAR | DIVIDE | DOTDOTDOT - | CON | LTYPE | VAL | REC | AND | FOLD | UNIT | KUNIT | CLASS + | CON | LTYPE | VAL | REC | AND | FUN | FOLD | UNIT | KUNIT | CLASS | DATATYPE | OF | TYPE | NAME | ARROW | LARROW | DARROW | STAR @@ -177,6 +177,7 @@ | decl of decl | vali of string * con option * exp | valis of (string * con option * exp) list + | copt of con option | dargs of string list | barOpt of unit @@ -230,6 +231,7 @@ | eargp of exp * con -> exp * con | eargs of exp * con -> exp * con | eargl of exp * con -> exp * con + | eargl2 of exp * con -> exp * con | branch of pat * exp | branchs of (pat * exp) list @@ -319,6 +321,7 @@ | _ => raise Fail "Arguments specified for imported datatype") | VAL vali (DVal vali, s (VALleft, valiright)) | VAL REC valis (DValRec valis, s (VALleft, valisright)) + | FUN valis (DValRec valis, s (FUNleft, valisright)) | SIGNATURE CSYMBOL EQ sgn (DSgn (CSYMBOL, sgn), s (SIGNATUREleft, sgnright)) | STRUCTURE CSYMBOL EQ str (DStr (CSYMBOL, NONE, str), s (STRUCTUREleft, strright)) @@ -365,8 +368,17 @@ dcon : CSYMBOL (CSYMBOL, NONE) | CSYMBOL OF cexp (CSYMBOL, SOME cexp) -vali : SYMBOL EQ eexp (SYMBOL, NONE, eexp) - | SYMBOL COLON cexp EQ eexp (SYMBOL, SOME cexp, eexp) +vali : SYMBOL eargl2 copt EQ eexp (let + val loc = s (SYMBOLleft, eexpright) + val t = Option.getOpt (copt, (CWild (KType, loc), loc)) + + val (e, t) = eargl2 (eexp, t) + in + (SYMBOL, SOME t, e) + end) + +copt : (NONE) + | COLON cexp (SOME cexp) valis : vali ([vali]) | vali AND valis (vali :: valis) @@ -581,6 +593,9 @@ eargl : eargp eargp (eargp1 o eargp2) | eargp eargl (eargp o eargl) +eargl2 : (fn x => x) + | eargp eargl2 (eargp o eargl2) + earg : SYMBOL kcolon kind (fn (e, t) => let val loc = s (SYMBOLleft, kindright)
--- a/src/lacweb.lex Thu Aug 28 13:57:12 2008 -0400 +++ b/src/lacweb.lex Thu Aug 28 14:05:47 2008 -0400 @@ -274,6 +274,7 @@ <INITIAL> "val" => (Tokens.VAL (pos yypos, pos yypos + size yytext)); <INITIAL> "rec" => (Tokens.REC (pos yypos, pos yypos + size yytext)); <INITIAL> "and" => (Tokens.AND (pos yypos, pos yypos + size yytext)); +<INITIAL> "fun" => (Tokens.FUN (pos yypos, pos yypos + size yytext)); <INITIAL> "fn" => (Tokens.FN (pos yypos, pos yypos + size yytext)); <INITIAL> "fold" => (Tokens.FOLD (pos yypos, pos yypos + size yytext)); <INITIAL> "case" => (Tokens.CASE (pos yypos, pos yypos + size yytext));
--- a/tests/eargs.lac Thu Aug 28 13:57:12 2008 -0400 +++ b/tests/eargs.lac Thu Aug 28 14:05:47 2008 -0400 @@ -3,3 +3,11 @@ val pair1 = fn (t1 ::: Type) (t2 ::: Type) (x1 : t1) (x2 : t2) => (x1, x2) val pair2 = fn (t1 ::: Type) (t2 ::: Type) (x1 : t1) (x2 : t2) () => pair1 x1 x2 + +val id3 n = id2 n +val id4 n : int = id3 n +val id5 (n : int) = id4 n +val id6 (n : int) : int = id5 n + +val id1 (t ::: Type) (x : t) = x +val id2 (t ::: Type) (x : t) : t = id1 x
--- a/tests/recBad.lac Thu Aug 28 13:57:12 2008 -0400 +++ b/tests/recBad.lac Thu Aug 28 14:05:47 2008 -0400 @@ -1,6 +1,6 @@ datatype list a = Nil | Cons of a * list a -val rec append : t ::: Type -> list t -> list t -> list t = fn t ::: Type => fn ls1 => fn ls2 => +fun append (t ::: Type) (ls1 : list t) (ls2 : list t) : list t = case ls1 of Nil => ls2 | Cons (h, t) => Cons (h, append t ls2)