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changeset 1425:139d019c7237

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Syntactic sugar for grouping by variable numbers of columns
author Adam Chlipala <adam@chlipala.net>
date Thu, 17 Feb 2011 18:05:08 -0500
parents 7f6ac9f33d4d
children 6365d10cd326
files src/urweb.grm
diffstat 1 files changed, 4 insertions(+), 1 deletions(-) [+]
line wrap: on
line diff
--- a/src/urweb.grm	Thu Feb 17 14:18:18 2011 -0500
+++ b/src/urweb.grm	Thu Feb 17 18:05:08 2011 -0500
@@ -51,6 +51,7 @@
 
 datatype group_item =
          GField of con * con
+       | GFields of con * con
 
 fun eqTnames ((c1, _), (c2, _)) =
     case (c1, c2) of
@@ -107,13 +108,14 @@
     let
         val (tx, c) = case gi of
                           GField (tx, fx) => (tx, (CRecord ([(fx, (CWild (KType, loc), loc))]), loc))
+                        | GFields (tx, fxs) => (tx, fxs)
 
         val (tabs, found) = ListUtil.foldlMap (fn ((tx', c'), found) =>
                                                   if eqTnames (tx, tx') then
                                                       ((tx', (CConcat (c, c'), loc)), true)
                                                   else
                                                       ((tx', c'), found))
-                            false tabs
+                                              false tabs
     in
         if found then
             ()
@@ -1871,6 +1873,7 @@
        | CWHERE sqlexp                  (sqlexp)
 
 groupi : tident DOT fident              (GField (tident, fident))
+       | tident DOT LBRACE LBRACE cexp RBRACE RBRACE (GFields (tident, cexp))
 
 groupis: groupi                         ([groupi])
        | groupi COMMA groupis           (groupi :: groupis)