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-rw-r--r--Python/initconfig.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/Python/initconfig.c b/Python/initconfig.c
index c313d91..7662d61 100644
--- a/Python/initconfig.c
+++ b/Python/initconfig.c
@@ -68,6 +68,7 @@ static const char usage_3[] = "\
-X opt : set implementation-specific option. The following options are available:\n\
\n\
-X faulthandler: enable faulthandler\n\
+ -X oldparser: enable the traditional LL(1) parser; also PYTHONOLDPARSER\n\
-X showrefcount: output the total reference count and number of used\n\
memory blocks when the program finishes or after each statement in the\n\
interactive interpreter. This only works on debug builds\n\
@@ -634,6 +635,7 @@ _PyConfig_InitCompatConfig(PyConfig *config)
#ifdef MS_WINDOWS
config->legacy_windows_stdio = -1;
#endif
+ config->use_peg = 1;
}
@@ -791,6 +793,7 @@ _PyConfig_Copy(PyConfig *config, const PyConfig *config2)
COPY_ATTR(isolated);
COPY_ATTR(use_environment);
COPY_ATTR(dev_mode);
+ COPY_ATTR(use_peg);
COPY_ATTR(install_signal_handlers);
COPY_ATTR(use_hash_seed);
COPY_ATTR(hash_seed);
@@ -894,6 +897,7 @@ config_as_dict(const PyConfig *config)
SET_ITEM_INT(isolated);
SET_ITEM_INT(use_environment);
SET_ITEM_INT(dev_mode);
+ SET_ITEM_INT(use_peg);
SET_ITEM_INT(install_signal_handlers);
SET_ITEM_INT(use_hash_seed);
SET_ITEM_UINT(hash_seed);
@@ -1428,6 +1432,11 @@ config_read_complex_options(PyConfig *config)
config->import_time = 1;
}
+ if (config_get_env(config, "PYTHONOLDPARSER")
+ || config_get_xoption(config, L"oldparser")) {
+ config->use_peg = 0;
+ }
+
PyStatus status;
if (config->tracemalloc < 0) {
status = config_init_tracemalloc(config);
@@ -2507,6 +2516,7 @@ PyConfig_Read(PyConfig *config)
assert(config->isolated >= 0);
assert(config->use_environment >= 0);
assert(config->dev_mode >= 0);
+ assert(config->use_peg >= 0);
assert(config->install_signal_handlers >= 0);
assert(config->use_hash_seed >= 0);
assert(config->faulthandler >= 0);