reintroduce the compiler API

src/compiler/api/GF/JavaScript/AbsJS.hs

@@ -0,0 +1,61 @@
+module GF.JavaScript.AbsJS where
+
+-- Haskell module generated by the BNF converter
+
+newtype Ident = Ident String deriving (Eq,Ord,Show)
+data Program =
+   Program [Element]
+  deriving (Eq,Ord,Show)
+
+data Element =
+   FunDef Ident [Ident] [Stmt]
+ | ElStmt Stmt
+  deriving (Eq,Ord,Show)
+
+data Stmt =
+   SCompound [Stmt]
+ | SReturnVoid
+ | SReturn Expr
+ | SDeclOrExpr DeclOrExpr
+  deriving (Eq,Ord,Show)
+
+data DeclOrExpr =
+   Decl [DeclVar]
+ | DExpr Expr
+  deriving (Eq,Ord,Show)
+
+data DeclVar =
+   DVar Ident
+ | DInit Ident Expr
+  deriving (Eq,Ord,Show)
+
+data Expr =
+   EAssign Expr Expr
+ | ENew Ident [Expr]
+ | EMember Expr Ident
+ | EIndex Expr Expr
+ | ECall Expr [Expr]
+ | EVar Ident
+ | EInt Int
+ | EDbl Double
+ | EStr String
+ | ETrue
+ | EFalse
+ | ENull
+ | EThis
+ | EFun [Ident] [Stmt]
+ | EArray [Expr]
+ | EObj [Property]
+ | ESeq [Expr]
+  deriving (Eq,Ord,Show)
+
+data Property =
+   Prop PropertyName Expr
+  deriving (Eq,Ord,Show)
+
+data PropertyName =
+   IdentPropName Ident
+ | StringPropName String
+ | IntPropName Int
+  deriving (Eq,Ord,Show)
+