changed names of resource-1.3; added a note on homepage on release

1 files changed, 42 insertions, 0 deletions

diff --git a/old-examples/systemS/Precedence.gf b/old-examples/systemS/Precedence.gf
new file mode 100644
index 000000000..7defd19aa
--- /dev/null
+++ b/old-examples/systemS/Precedence.gf
@@ -0,0 +1,42 @@
+resource Precedence = open (Predef = Predef) in {
+
+  param 
+    PAssoc = PN | PL | PR ;
+
+  oper 
+    Prec    : PType = Predef.Ints 4 ;
+    PrecExp : Type = {s : Str ; p : Prec ; a : PAssoc} ;
+
+    mkPrec : Prec -> PAssoc -> Str -> PrecExp = \p,a,f -> 
+      {s = f ; p = p ; a = a} ;
+
+    usePrec : PrecExp -> Prec -> Str = \x,p ->
+      case <<x.p,p> : Prec * Prec> of {
+        <3,4> | <2,3> | <2,4> => paren x.s ;
+        <1,1> | <1,0> | <0,0> => x.s ;
+        <1,_> | <0,_>         => paren x.s ;
+        _ => x.s
+        } ;
+
+    useTop : PrecExp -> Str = \e -> usePrec e 0 ;
+
+    constant : Str -> PrecExp = mkPrec 4 PN ;
+
+    infixN : Prec -> Str -> (_,_ : PrecExp) -> PrecExp = \p,f,x,y ->
+      mkPrec p PN (usePrec x (nextPrec p) ++ f ++ usePrec y (nextPrec p)) ;
+    infixL : Prec -> Str -> (_,_ : PrecExp) -> PrecExp = \p,f,x,y ->
+      mkPrec p PL (usePrec x p ++ f ++ usePrec y (nextPrec p)) ;
+    infixR : Prec -> Str -> (_,_ : PrecExp) -> PrecExp = \p,f,x,y ->
+      mkPrec p PR (usePrec x (nextPrec p) ++ f ++ usePrec y p) ;
+
+    prefixR : Prec -> Str -> PrecExp -> PrecExp = \p,f,x ->
+      mkPrec p PR (f ++ usePrec x p) ;
+
+    nextPrec : Prec -> Prec = \p -> case <p : Prec> of {
+      4 => 4 ; 
+      n => Predef.plus n 1
+      } ;
+
+    paren : Str -> Str = \s -> "(" ++ s ++ ")" ;
+
+}