Mercurial > urweb
diff src/lacweb.grm @ 240:7036d29574f2
Shorthand for multi-binding con declaration
author | Adam Chlipala <adamc@hcoop.net> |
---|---|
date | Thu, 28 Aug 2008 13:39:20 -0400 |
parents | fc6f04889bf2 |
children | 052126db06e7 |
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--- a/src/lacweb.grm Thu Aug 28 13:29:57 2008 -0400 +++ b/src/lacweb.grm Thu Aug 28 13:39:20 2008 -0400 @@ -193,6 +193,7 @@ | kind of kind | ktuple of kind list | kcolon of explicitness + | kopt of kind option | path of string list * string | cpath of string list * string @@ -211,6 +212,7 @@ | rcone of (con * con) list | cargs of con * kind -> con * kind | cargl of con * kind -> con * kind + | cargl2 of con * kind -> con * kind | carg of con * kind -> con * kind | cargp of con * kind -> con * kind @@ -295,8 +297,14 @@ decls : ([]) | decl decls (decl :: decls) -decl : CON SYMBOL EQ cexp (DCon (SYMBOL, NONE, cexp), s (CONleft, cexpright)) - | CON SYMBOL DCOLON kind EQ cexp (DCon (SYMBOL, SOME kind, cexp), s (CONleft, cexpright)) +decl : CON SYMBOL cargl2 kopt EQ cexp (let + val loc = s (CONleft, cexpright) + + val k = Option.getOpt (kopt, (KWild, loc)) + val (c, k) = cargl2 (cexp, k) + in + (DCon (SYMBOL, SOME k, c), loc) + end) | LTYPE SYMBOL EQ cexp (DCon (SYMBOL, SOME (KType, s (LTYPEleft, cexpright)), cexp), s (LTYPEleft, cexpright)) | DATATYPE SYMBOL dargs EQ barOpt dcons(DDatatype (SYMBOL, dargs, dcons), s (DATATYPEleft, dconsright)) @@ -337,6 +345,9 @@ (DClass (SYMBOL1, c), s (CLASSleft, cexpright)) end) +kopt : (NONE) + | DCOLON kind (SOME kind) + dargs : ([]) | SYMBOL dargs (SYMBOL :: dargs) @@ -464,6 +475,9 @@ cargl : cargp cargp (cargp1 o cargp2) | cargp cargl (cargp o cargl) +cargl2 : (fn x => x) + | cargp cargl2 (cargp o cargl2) + carg : SYMBOL (fn (c, k) => let val loc = s (SYMBOLleft, SYMBOLright)