bpo-40939: Remove the old parser (GH-20768)

This commit removes the old parser, the deprecated parser module, the old parser compatibility flags and environment variables and all associated support code and documentation.

1 files changed, 0 insertions, 10 deletions

diff --git a/Python/initconfig.c b/Python/initconfig.c
index 998ceb7bbf..d8b3df8857 100644
--- a/Python/initconfig.c
+++ b/Python/initconfig.c
@@ -72,7 +72,6 @@ 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\
@@ -640,7 +639,6 @@ _PyConfig_InitCompatConfig(PyConfig *config)
 #ifdef MS_WINDOWS
     config->legacy_windows_stdio = -1;
 #endif
-    config->_use_peg_parser = 1;
 }
 
 
@@ -798,7 +796,6 @@ _PyConfig_Copy(PyConfig *config, const PyConfig *config2)
     COPY_ATTR(isolated);
     COPY_ATTR(use_environment);
     COPY_ATTR(dev_mode);
-    COPY_ATTR(_use_peg_parser);
     COPY_ATTR(install_signal_handlers);
     COPY_ATTR(use_hash_seed);
     COPY_ATTR(hash_seed);
@@ -905,7 +902,6 @@ 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_parser);
     SET_ITEM_INT(install_signal_handlers);
     SET_ITEM_INT(use_hash_seed);
     SET_ITEM_UINT(hash_seed);
@@ -1451,11 +1447,6 @@ 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_parser = 0;
-    }
-
     PyStatus status;
     if (config->tracemalloc < 0) {
         status = config_init_tracemalloc(config);
@@ -2549,7 +2540,6 @@ PyConfig_Read(PyConfig *config)
     assert(config->isolated >= 0);
     assert(config->use_environment >= 0);
     assert(config->dev_mode >= 0);
-    assert(config->_use_peg_parser >= 0);
     assert(config->install_signal_handlers >= 0);
     assert(config->use_hash_seed >= 0);
     assert(config->faulthandler >= 0);