1 files changed, 34 insertions, 0 deletions
diff --git a/html-test/tests/QuasiExpr.hs b/html-test/tests/QuasiExpr.hs
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+{-# LANGUAGE TemplateHaskell #-}
+
+-- Used by QuasiQuote. Example taken from the GHC documentation.
+module QuasiExpr where
+
+import Language.Haskell.TH
+import Language.Haskell.TH.Quote
+
+data Expr  =  IntExpr Integer
+           |  AntiIntExpr String
+           |  BinopExpr BinOp Expr Expr
+           |  AntiExpr String
+    deriving Show
+
+data BinOp  =  AddOp
+            |  SubOp
+            |  MulOp
+            |  DivOp
+    deriving Show
+
+eval :: Expr -> Integer
+eval (IntExpr n)        = n
+eval (BinopExpr op x y) = (opToFun op) (eval x) (eval y)
+  where
+    opToFun AddOp = (+)
+    opToFun SubOp = (-)
+    opToFun MulOp = (*)
+    opToFun DivOp = div
+
+expr = QuasiQuoter parseExprExp undefined undefined undefined
+
+-- cheating...
+parseExprExp :: String -> Q Exp
+parseExprExp _ = [| BinopExpr AddOp (IntExpr 1) (IntExpr 2) |]