fixed some tutorial grammars and updated embedded section (JavaScript and web TODO)

examples/tutorial/embedded/Makefile

@@ -0,0 +1,4 @@
+all:
+	gfc --make --output-format=haskell QueryEng.gf
+	ghc --make -o ./math TransferLoop.hs
+	strip math

examples/tutorial/embedded/Query.gf

@@ -0,0 +1,17 @@
+abstract Query = {
+
+  flags startcat=Question ;
+
+  cat 
+    Answer ; Question ; Object ;
+
+  fun 
+    Even   : Object -> Question ;
+    Odd    : Object -> Question ;
+    Prime  : Object -> Question ;
+    Number : Int -> Object ;
+
+    Yes : Answer ;
+    No  : Answer ;
+}
+

examples/tutorial/embedded/QueryEng.gf

@@ -0,0 +1,15 @@
+concrete QueryEng of Query = {
+  lincat 
+    Answer, Question, Object = Str ;
+
+  lin 
+    Even x = "is" ++ x ++ "even" ;
+    Odd  x = "is" ++ x ++ "odd" ;
+    Prime x = "is" ++ x ++ "prime" ;
+    Number n = n.s ;
+
+    Yes = "yes" ;
+    No = "no" ;
+
+}
+

examples/tutorial/embedded/TransferDef.hs

@@ -0,0 +1,26 @@
+module TransferDef where
+
+import PGF (Tree)
+import Query   -- generated from GF
+
+transfer :: Tree -> Tree
+transfer = gf . answer . fg
+
+answer :: GQuestion -> GAnswer
+answer p = case p of
+  GOdd x   -> test odd x
+  GEven x  -> test even x
+  GPrime x -> test prime x
+
+value :: GObject -> Int
+value e = case e of
+  GNumber (GInt i) -> fromInteger i
+
+test :: (Int -> Bool) -> GObject -> GAnswer
+test f x = if f (value x) then GYes else GNo
+
+prime :: Int -> Bool
+prime x = elem x primes where
+  primes = sieve [2 .. x]
+  sieve (p:xs) = p : sieve [ n | n <- xs, n `mod` p > 0 ]
+  sieve [] = []

examples/tutorial/embedded/TransferLoop.hs

@@ -0,0 +1,21 @@
+module Main where
+
+import PGF
+import TransferDef (transfer)
+
+main :: IO () 
+main = do
+  gr <- readPGF "Query.pgf"
+  loop (translate transfer gr)
+
+loop :: (String -> String) -> IO ()
+loop trans = do 
+  s <- getLine
+  if s == "quit" then putStrLn "bye" else do  
+    putStrLn $ trans s
+    loop trans
+
+translate :: (Tree -> Tree) -> PGF -> String -> String
+translate tr gr s = case parseAllLang gr (startCat gr) s of
+  (lg,t:_):_ -> linearize gr lg (tr t)
+  _ -> "NO PARSE"