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bpo-34822: Simplify AST for subscription. (GH-9605)

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* Remove the slice type.
* Make Slice a kind of the expr type instead of the slice type.
* Replace ExtSlice(slices) with Tuple(slices, Load()).
* Replace Index(value) with a value itself.

All non-terminal nodes in AST for expressions are now of the expr type.
This commit is contained in:
Serhiy Storchaka 2020-03-10 18:52:34 +02:00 • committed by GitHub
parent e5e56328af
commit 13d52c2686
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GPG key ID: 4AEE18F83AFDEB23
15 changed files with 300 additions and 709 deletions
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51
Python/ast_unparse.c
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@ -17,7 +17,7 @@ append_joinedstr(_PyUnicodeWriter *writer, expr_ty e, bool is_format_spec);
static int
append_formattedvalue(_PyUnicodeWriter *writer, expr_ty e);
static int
append_ast_slice(_PyUnicodeWriter *writer, slice_ty slice);
append_ast_slice(_PyUnicodeWriter *writer, expr_ty e);
static int
append_charp(_PyUnicodeWriter *writer, const char *charp)
@ -718,62 +718,31 @@ append_ast_attribute(_PyUnicodeWriter *writer, expr_ty e)
}
static int
append_ast_simple_slice(_PyUnicodeWriter *writer, slice_ty slice)
append_ast_slice(_PyUnicodeWriter *writer, expr_ty e)
{
if (slice->v.Slice.lower) {
APPEND_EXPR(slice->v.Slice.lower, PR_TEST);
if (e->v.Slice.lower) {
APPEND_EXPR(e->v.Slice.lower, PR_TEST);
}
APPEND_STR(":");
if (slice->v.Slice.upper) {
APPEND_EXPR(slice->v.Slice.upper, PR_TEST);
if (e->v.Slice.upper) {
APPEND_EXPR(e->v.Slice.upper, PR_TEST);
}
if (slice->v.Slice.step) {
if (e->v.Slice.step) {
APPEND_STR(":");
APPEND_EXPR(slice->v.Slice.step, PR_TEST);
APPEND_EXPR(e->v.Slice.step, PR_TEST);
}
return 0;
}
static int
append_ast_ext_slice(_PyUnicodeWriter *writer, slice_ty slice)
{
Py_ssize_t i, dims_count;
dims_count = asdl_seq_LEN(slice->v.ExtSlice.dims);
for (i = 0; i < dims_count; i++) {
APPEND_STR_IF(i > 0, ", ");
APPEND(slice, (slice_ty)asdl_seq_GET(slice->v.ExtSlice.dims, i));
}
APPEND_STR_IF(dims_count == 1, ",");
return 0;
}
static int
append_ast_slice(_PyUnicodeWriter *writer, slice_ty slice)
{
switch (slice->kind) {
case Slice_kind:
return append_ast_simple_slice(writer, slice);
case ExtSlice_kind:
return append_ast_ext_slice(writer, slice);
case Index_kind:
APPEND_EXPR(slice->v.Index.value, PR_TUPLE);
return 0;
default:
PyErr_SetString(PyExc_SystemError,
"unexpected slice kind");
return -1;
}
}
static int
append_ast_subscript(_PyUnicodeWriter *writer, expr_ty e)
{
APPEND_EXPR(e->v.Subscript.value, PR_ATOM);
APPEND_STR("[");
APPEND(slice, e->v.Subscript.slice);
APPEND_EXPR(e->v.Subscript.slice, PR_TUPLE);
APPEND_STR_FINISH("]");
}
@ -878,6 +847,8 @@ append_ast_expr(_PyUnicodeWriter *writer, expr_ty e, int level)
return append_ast_subscript(writer, e);
case Starred_kind:
return append_ast_starred(writer, e);
case Slice_kind:
return append_ast_slice(writer, e);
case Name_kind:
return _PyUnicodeWriter_WriteStr(writer, e->v.Name.id);
case List_kind: