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bpo-40939: Remove PEG parser easter egg (__new_parser__) (#20802) 

It no longer serves a purpose (there's only one parser) and having "new" in any name will eventually look odd. Also, it impinges on a potential sub-namespace, `__new_...__`.
This commit is contained in:
Lysandros Nikolaou 2020-06-11 19:09:21 +03:00 committed by GitHub
parent 10e6506aa8
commit bcd7deed91
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 10 additions and 47 deletions
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1
Grammar/python.gram
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@ -477,7 +477,6 @@ atom[expr_ty]:
| 'True' { _Py_Constant(Py_True, NULL, EXTRA) }
| 'False' { _Py_Constant(Py_False, NULL, EXTRA) }
| 'None' { _Py_Constant(Py_None, NULL, EXTRA) }
| '__new_parser__' { RAISE_SYNTAX_ERROR("You found it!") }
| &STRING strings
| NUMBER
| &'(' (tuple | group | genexp)

1
Lib/keyword.py
View File

@ -19,7 +19,6 @@ kwlist = [
'False',
'None',
'True',
'__new_parser__',
'and',
'as',
'assert',

1
Lib/pydoc.py
View File

@ -1817,7 +1817,6 @@ class Helper:
'False': '',
'None': '',
'True': '',
'__new_parser__': '',
'and': 'BOOLEAN',
'as': 'with',
'assert': ('assert', ''),

54
Parser/pegen/parse.c
View File

@ -7,7 +7,7 @@ extern int Py_DebugFlag;
#else
#define D(x)
#endif
static const int n_keyword_lists = 15;
static const int n_keyword_lists = 9;
static KeywordToken *reserved_keywords[] = {
NULL,
NULL,
@ -15,8 +15,8 @@ static KeywordToken *reserved_keywords[] = {
{"if", 510},
{"in", 518},
{"is", 526},
{"as", 531},
{"or", 532},
{"as", 530},
{"or", 531},
{NULL, -1},
},
(KeywordToken[]) {
@ -25,7 +25,7 @@ static KeywordToken *reserved_keywords[] = {
{"for", 517},
{"def", 522},
{"not", 525},
{"and", 533},
{"and", 532},
{NULL, -1},
},
(KeywordToken[]) {
@ -65,15 +65,6 @@ static KeywordToken *reserved_keywords[] = {
{"nonlocal", 509},
{NULL, -1},
},
NULL,
NULL,
NULL,
NULL,
NULL,
(KeywordToken[]) {
{"__new_parser__", 530},
{NULL, -1},
},
};
#define file_type 1000
#define interactive_type 1001
@ -10567,7 +10558,6 @@ slice_rule(Parser *p)
// | 'True'
// | 'False'
// | 'None'
// | '__new_parser__'
// | &STRING strings
// | NUMBER
// | &'(' (tuple | group | genexp)
@ -10711,30 +10701,6 @@ atom_rule(Parser *p)
D(fprintf(stderr, "%*c%s atom[%d-%d]: %s failed!\n", p->level, ' ',
p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "'None'"));
}
{ // '__new_parser__'
if (p->error_indicator) {
D(p->level--);
return NULL;
}
D(fprintf(stderr, "%*c> atom[%d-%d]: %s\n", p->level, ' ', _mark, p->mark, "'__new_parser__'"));
Token * _keyword;
if (
(_keyword = _PyPegen_expect_token(p, 530)) // token='__new_parser__'
)
{
D(fprintf(stderr, "%*c+ atom[%d-%d]: %s succeeded!\n", p->level, ' ', _mark, p->mark, "'__new_parser__'"));
_res = RAISE_SYNTAX_ERROR ( "You found it!" );
if (_res == NULL && PyErr_Occurred()) {
p->error_indicator = 1;
D(p->level--);
return NULL;
}
goto done;
}
p->mark = _mark;
D(fprintf(stderr, "%*c%s atom[%d-%d]: %s failed!\n", p->level, ' ',
p->error_indicator ? "ERROR!" : "-", _mark, p->mark, "'__new_parser__'"));
}
{ // &STRING strings
if (p->error_indicator) {
D(p->level--);
@ -17313,7 +17279,7 @@ _tmp_34_rule(Parser *p)
Token * _keyword;
expr_ty z;
if (
(_keyword = _PyPegen_expect_token(p, 531)) // token='as'
(_keyword = _PyPegen_expect_token(p, 530)) // token='as'
&&
(z = _PyPegen_name_token(p)) // NAME
)
@ -17471,7 +17437,7 @@ _tmp_37_rule(Parser *p)
Token * _keyword;
expr_ty z;
if (
(_keyword = _PyPegen_expect_token(p, 531)) // token='as'
(_keyword = _PyPegen_expect_token(p, 530)) // token='as'
&&
(z = _PyPegen_name_token(p)) // NAME
)
@ -17971,7 +17937,7 @@ _tmp_46_rule(Parser *p)
Token * _keyword;
expr_ty t;
if (
(_keyword = _PyPegen_expect_token(p, 531)) // token='as'
(_keyword = _PyPegen_expect_token(p, 530)) // token='as'
&&
(t = target_rule(p)) // target
)
@ -18086,7 +18052,7 @@ _tmp_48_rule(Parser *p)
Token * _keyword;
expr_ty z;
if (
(_keyword = _PyPegen_expect_token(p, 531)) // token='as'
(_keyword = _PyPegen_expect_token(p, 530)) // token='as'
&&
(z = _PyPegen_name_token(p)) // NAME
)
@ -23892,7 +23858,7 @@ _tmp_144_rule(Parser *p)
Token * _keyword;
expr_ty c;
if (
(_keyword = _PyPegen_expect_token(p, 532)) // token='or'
(_keyword = _PyPegen_expect_token(p, 531)) // token='or'
&&
(c = conjunction_rule(p)) // conjunction
)
@ -23936,7 +23902,7 @@ _tmp_145_rule(Parser *p)
Token * _keyword;
expr_ty c;
if (
(_keyword = _PyPegen_expect_token(p, 533)) // token='and'
(_keyword = _PyPegen_expect_token(p, 532)) // token='and'
&&
(c = inversion_rule(p)) // inversion
)