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Add ast.Constant

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Issue #26146: Add a new kind of AST node: ast.Constant. It can be used by
external AST optimizers, but the compiler does not emit directly such node.

An optimizer can replace the following AST nodes with ast.Constant:

* ast.NameConstant: None, False, True
* ast.Num: int, float, complex
* ast.Str: str
* ast.Bytes: bytes
* ast.Tuple if items are constants too: tuple
* frozenset

Update code to accept ast.Constant instead of ast.Num and/or ast.Str:

* compiler
* docstrings
* ast.literal_eval()
* Tools/parser/unparse.py
This commit is contained in:
Victor Stinner 2016-01-26 00:40:57 +01:00
parent 0dceb91866
commit f2c1aa1661
14 changed files with 401 additions and 44 deletions
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13
Include/Python-ast.h
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@ -202,9 +202,9 @@ enum _expr_kind {BoolOp_kind=1, BinOp_kind=2, UnaryOp_kind=3, Lambda_kind=4,
Await_kind=12, Yield_kind=13, YieldFrom_kind=14,
Compare_kind=15, Call_kind=16, Num_kind=17, Str_kind=18,
FormattedValue_kind=19, JoinedStr_kind=20, Bytes_kind=21,
NameConstant_kind=22, Ellipsis_kind=23, Attribute_kind=24,
Subscript_kind=25, Starred_kind=26, Name_kind=27,
List_kind=28, Tuple_kind=29};
NameConstant_kind=22, Ellipsis_kind=23, Constant_kind=24,
Attribute_kind=25, Subscript_kind=26, Starred_kind=27,
Name_kind=28, List_kind=29, Tuple_kind=30};
struct _expr {
enum _expr_kind kind;
union {
@ -315,6 +315,10 @@ struct _expr {
singleton value;
} NameConstant;
struct {
constant value;
} Constant;
struct {
expr_ty value;
identifier attr;
@ -567,6 +571,9 @@ expr_ty _Py_NameConstant(singleton value, int lineno, int col_offset, PyArena
*arena);
#define Ellipsis(a0, a1, a2) _Py_Ellipsis(a0, a1, a2)
expr_ty _Py_Ellipsis(int lineno, int col_offset, PyArena *arena);
#define Constant(a0, a1, a2, a3) _Py_Constant(a0, a1, a2, a3)
expr_ty _Py_Constant(constant value, int lineno, int col_offset, PyArena
*arena);
#define Attribute(a0, a1, a2, a3, a4, a5) _Py_Attribute(a0, a1, a2, a3, a4, a5)
expr_ty _Py_Attribute(expr_ty value, identifier attr, expr_context_ty ctx, int
lineno, int col_offset, PyArena *arena);