diff options
| author |  Adam Chlipala <adamc@hcoop.net> | 2008-08-16 14:32:18 -0400 |
|---|---|---|
| committer | Adam Chlipala <adamc@hcoop.net> | 2008-08-16 14:32:18 -0400 |
| commit | b4f1361d2dff2e180e4656efa491b275707cdf02 (patch) | |
| tree | dc76b47422a5d2bcdbd78d9b9ab35fe30b4991c8 /src/elab_util.sml | |
| parent | c8fa648dbc2489ca4a56abbb27d94819fb75b5ec (diff) | |
Initial type class support
Diffstat (limited to 'src/elab_util.sml')
| -rw-r--r-- | src/elab_util.sml | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/src/elab_util.sml b/src/elab_util.sml index b0bca7bf..c3ed2d19 100644 --- a/src/elab_util.sml +++ b/src/elab_util.sml @@ -376,6 +376,14 @@ fun exists {kind, con, exp} k = S.Return _ => true | S.Continue _ => false +fun mapB {kind, con, exp, bind} ctx e = + case mapfoldB {kind = fn k => fn () => S.Continue (kind k, ()), + con = fn ctx => fn c => fn () => S.Continue (con ctx c, ()), + exp = fn ctx => fn e => fn () => S.Continue (exp ctx e, ()), + bind = bind} ctx e () of + S.Continue (e, ()) => e + | S.Return _ => raise Fail "ElabUtil.Exp.mapB: Impossible" + end structure Sgn = struct @@ -455,6 +463,11 @@ fun mapfoldB {kind, con, sgn_item, sgn, bind} = S.map2 (con ctx c, fn c' => (SgiTable (tn, x, n, c'), loc)) + | SgiClassAbs _ => S.return2 siAll + | SgiClass (x, n, c) => + S.map2 (con ctx c, + fn c' => + (SgiClass (x, n, c'), loc)) and sg ctx s acc = S.bindP (sg' ctx s acc, sgn ctx) @@ -478,7 +491,11 @@ fun mapfoldB {kind, con, sgn_item, sgn, bind} = | SgiSgn (x, _, sgn) => bind (ctx, Sgn (x, sgn)) | SgiConstraint _ => ctx - | SgiTable _ => ctx, + | SgiTable _ => ctx + | SgiClassAbs (x, _) => + bind (ctx, NamedC (x, (KArrow ((KType, loc), (KType, loc)), loc))) + | SgiClass (x, _, _) => + bind (ctx, NamedC (x, (KArrow ((KType, loc), (KType, loc)), loc))), sgi ctx si)) ctx sgis, fn sgis' => (SgnConst sgis', loc)) |