-- Python 3.2 AST
-- ASDL's four builtin types are identifier, int, string, object

module Python version "3.2"
{
    mod = Module(stmt* body)
        | Interactive(stmt* body)
        | Expression(expr body)

        -- not really an actual node but useful in Jython's typesystem.
        | Suite(stmt* body)

    stmt = FunctionDef(identifier name,
                       arguments args,
                       stmt* body,
                       expr* decorator_list,
                       expr? returns)
         | ClassDef(identifier name,
                    expr* bases,
                    keyword* keywords,
                    expr? starargs,
                    expr? kwargs,
                    stmt* body,
                    expr* decorator_list)
         | Return(expr? value)

         | Delete(expr* targets)
         | Assign(expr* targets, expr value)
         | AugAssign(expr target, operator op, expr value)

         -- use 'orelse' because else is a keyword in target languages
         | For(expr target, expr iter, stmt* body, stmt* orelse)
         | While(expr test, stmt* body, stmt* orelse)
         | If(expr test, stmt* body, stmt* orelse)
         | With(expr context_expr, expr? optional_vars, stmt* body)

         | Raise(expr? exc, expr? cause)
         | TryExcept(stmt* body, excepthandler* handlers, stmt* orelse)
         | TryFinally(stmt* body, stmt* finalbody)
         | Assert(expr test, expr? msg)

         | Import(alias* names)
         | ImportFrom(identifier? module, alias* names, int? level)

         | Global(identifier* names)
         | Nonlocal(identifier* names)
         | Expr(expr value)
         | Pass
         | Break
         | Continue

         -- XXX Jython will be different
         -- col_offset is the byte offset in the utf8 string the parser uses
         attributes (int lineno, int col_offset)

         -- BoolOp() can use left & right?
    expr = BoolOp(boolop op, expr* values)
         | BinOp(expr left, operator op, expr right)
         | UnaryOp(unaryop op, expr operand)
         | Lambda(arguments args, expr body)
         | IfExp(expr test, expr body, expr orelse)
         | Dict(expr* keys, expr* values)
         | Set(expr* elts)
         | ListComp(expr elt, comprehension* generators)
         | SetComp(expr elt, comprehension* generators)
         | DictComp(expr key, expr value, comprehension* generators)
         | GeneratorExp(expr elt, comprehension* generators)
         -- the grammar constrains where yield expressions can occur
         | Yield(expr? value)
         -- need sequences for compare to distinguish between
         -- x < 4 < 3 and (x < 4) < 3
         | Compare(expr left, cmpop* ops, expr* comparators)
         | Call(expr func,
                expr* args,
                keyword* keywords,
                expr? starargs,
                expr? kwargs)
         | Num(object n) -- a number as a PyObject.
         | Str(string s) -- need to specify raw, unicode, etc?
         | Bytes(string s)
         | Ellipsis
         -- other literals? bools?

         -- the following expression can appear in assignment context
         | Attribute(expr value, identifier attr, expr_context ctx)
         | Subscript(expr value, slice slice, expr_context ctx)
         | Starred(expr value, expr_context ctx)
         | Name(identifier id, expr_context ctx)
         | List(expr* elts, expr_context ctx)
         | Tuple(expr* elts, expr_context ctx)

         -- col_offset is the byte offset in the utf8 string the parser uses
         attributes (int lineno, int col_offset)

    expr_context = Load
                 | Store
                 | Del
                 | AugLoad
                 | AugStore
                 | Param

    slice = Slice(expr? lower, expr? upper, expr? step)
          | ExtSlice(slice* dims)
          | Index(expr value)

    boolop = And
           | Or

    operator = Add
             | Sub
             | Mult
             | Div
             | Mod
             | Pow
             | LShift
             | RShift
             | BitOr
             | BitXor
             | BitAnd
             | FloorDiv

    unaryop = Invert
            | Not
            | UAdd
            | USub

    cmpop = Eq
          | NotEq
          | Lt
          | LtE
          | Gt
          | GtE
          | Is
          | IsNot
          | In
          | NotIn

    comprehension = (expr target, expr iter, expr* ifs)

    -- not sure what to call the first argument for raise and except
    excepthandler = ExceptHandler(expr? type, identifier? name, stmt* body)
                    attributes (int lineno, int col_offset)

    arguments = (arg* args,
                 identifier? vararg,
                 expr? varargannotation,
                 arg* kwonlyargs,
                 identifier? kwarg,
                 expr? kwargannotation,
                 expr* defaults,
                 expr* kw_defaults)
    arg = (identifier arg, expr? annotation)

    -- keyword arguments supplied to call
    keyword = (identifier arg, expr value)

    -- import name with optional 'as' alias.
    alias = (identifier name, identifier? asname)
}
