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81e9502df6
Add nonlocal_stmt to Grammar and Nonlocal node to AST. They both parallel the definitions for globals. The symbol table treats variables declared as nonlocal just like variables that are free implicitly. This change is missing the language spec changes, but makes some decisions about what the spec should say via the unittests. The PEP is silent on a number of decisions, so we should review those before claiming that nonlocal is complete. Thomas Wouters made the grammer and ast changes. Jeremy Hylton added the symbol table changes and the tests. Pete Shinners and Neal Norwitz helped review the code.
116 lines
4.2 KiB
Plaintext
116 lines
4.2 KiB
Plaintext
-- ASDL's five builtin types are identifier, int, string, object
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module Python version "$Revision$"
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{
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mod = Module(stmt* body)
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| Interactive(stmt* body)
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| Expression(expr body)
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-- not really an actual node but useful in Jython's typesystem.
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| Suite(stmt* body)
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stmt = FunctionDef(identifier name, arguments args,
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stmt* body, expr* decorators, expr? returns)
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| ClassDef(identifier name, expr* bases, stmt* body)
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| Return(expr? value)
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| Delete(expr* targets)
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| Assign(expr* targets, expr value)
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| AugAssign(expr target, operator op, expr value)
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-- use 'orelse' because else is a keyword in target languages
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| For(expr target, expr iter, stmt* body, stmt* orelse)
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| While(expr test, stmt* body, stmt* orelse)
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| If(expr test, stmt* body, stmt* orelse)
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| With(expr context_expr, expr? optional_vars, stmt* body)
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-- 'type' is a bad name
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| Raise(expr? type, expr? inst, expr? tback)
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| TryExcept(stmt* body, excepthandler* handlers, stmt* orelse)
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| TryFinally(stmt* body, stmt* finalbody)
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| Assert(expr test, expr? msg)
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| Import(alias* names)
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| ImportFrom(identifier module, alias* names, int? level)
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| Global(identifier* names)
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| Nonlocal(identifier* names)
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| Expr(expr value)
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| Pass | Break | Continue
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-- XXX Jython will be different
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-- col_offset is the byte offset in the utf8 string the parser uses
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attributes (int lineno, int col_offset)
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-- BoolOp() can use left & right?
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expr = BoolOp(boolop op, expr* values)
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| BinOp(expr left, operator op, expr right)
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| UnaryOp(unaryop op, expr operand)
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| Lambda(arguments args, expr body)
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| IfExp(expr test, expr body, expr orelse)
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| Dict(expr* keys, expr* values)
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| Set(expr* elts)
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| ListComp(expr elt, comprehension* generators)
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| GeneratorExp(expr elt, comprehension* generators)
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-- the grammar constrains where yield expressions can occur
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| Yield(expr? value)
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-- need sequences for compare to distinguish between
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-- x < 4 < 3 and (x < 4) < 3
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| Compare(expr left, cmpop* ops, expr* comparators)
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| Call(expr func, expr* args, keyword* keywords,
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expr? starargs, expr? kwargs)
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| Num(object n) -- a number as a PyObject.
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| Str(string s) -- need to specify raw, unicode, etc?
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| Bytes(string s)
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| Ellipsis
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-- other literals? bools?
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-- the following expression can appear in assignment context
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| Attribute(expr value, identifier attr, expr_context ctx)
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| Subscript(expr value, slice slice, expr_context ctx)
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| Name(identifier id, expr_context ctx)
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| List(expr* elts, expr_context ctx)
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| Tuple(expr* elts, expr_context ctx)
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-- col_offset is the byte offset in the utf8 string the parser uses
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attributes (int lineno, int col_offset)
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expr_context = Load | Store | Del | AugLoad | AugStore | Param
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slice = Slice(expr? lower, expr? upper, expr? step)
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| ExtSlice(slice* dims)
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| Index(expr value)
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boolop = And | Or
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operator = Add | Sub | Mult | Div | Mod | Pow | LShift
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| RShift | BitOr | BitXor | BitAnd | FloorDiv
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unaryop = Invert | Not | UAdd | USub
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cmpop = Eq | NotEq | Lt | LtE | Gt | GtE | Is | IsNot | In | NotIn
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comprehension = (expr target, expr iter, expr* ifs)
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-- not sure what to call the first argument for raise and except
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-- TODO(jhylton): Figure out if there is a better way to handle
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-- lineno and col_offset fields, particularly when
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-- ast is exposed to Python.
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excepthandler = (expr? type, identifier? name, stmt* body, int lineno,
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int col_offset)
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arguments = (arg* args, identifier? vararg, expr? varargannotation,
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arg* kwonlyargs, identifier? kwarg,
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expr? kwargannotation, expr* defaults,
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expr* kw_defaults)
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arg = SimpleArg(identifier arg, expr? annotation)
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| NestedArgs(arg* args)
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-- keyword arguments supplied to call
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keyword = (identifier arg, expr value)
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-- import name with optional 'as' alias.
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alias = (identifier name, identifier? asname)
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}
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