lecture 3 material and README

lectures/lecture-03/MorphologyEng.gf

@@ -1 +1,34 @@
-resource MorphologyEng = {}
+resource MorphologyEng = {
+
+param
+  Number = Sg | Pl ;
+
+oper
+  Noun : Type = {s : Number => Str} ;
+
+  mkNoun : Str -> Str -> Noun = \sg, pl -> 
+    {s = table {Sg => sg ; Pl => pl}} ;
+    
+  regNoun : Str -> Noun = \sg -> mkNoun sg (sg + "s") ;
+
+  smartNoun : Str -> Noun = \sg -> case sg of {
+    _ + ("s" | "ch" | "sh") => mkNoun sg (sg + "es") ;
+    _ + ("ay" | "ey" | "oy" | "uy") => regNoun sg ;
+    x + "y" => mkNoun sg (x + "ies") ;
+    _ => regNoun sg
+    } ;
+
+-- to test
+  teacher_N : Noun = {s = table {Sg => "teacher" ; Pl => "teachers"}} ;
+  
+  cat_N : Noun = mkNoun "cat" "cats" ;
+
+  dog_N : Noun = regNoun "dog" ;
+
+  bus_N : Noun = smartNoun "bus" ;
+  baby_N : Noun = smartNoun "baby" ;
+  fly_N : Noun = smartNoun "fly" ;
+  
+
+}
+