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, 273 insertions, 0 deletions

diff --git a/Parser/pegen.h b/Parser/pegen.h
new file mode 100644
index 0000000..64cf0ec
--- /dev/null
+++ b/Parser/pegen.h
@@ -0,0 +1,273 @@
+#ifndef PEGEN_H
+#define PEGEN_H
+
+#define PY_SSIZE_T_CLEAN
+#include <Python.h>
+#include <token.h>
+#include <Python-ast.h>
+#include <pyarena.h>
+
+#if 0
+#define PyPARSE_YIELD_IS_KEYWORD        0x0001
+#endif
+
+#define PyPARSE_DONT_IMPLY_DEDENT       0x0002
+
+#if 0
+#define PyPARSE_WITH_IS_KEYWORD         0x0003
+#define PyPARSE_PRINT_IS_FUNCTION       0x0004
+#define PyPARSE_UNICODE_LITERALS        0x0008
+#endif
+
+#define PyPARSE_IGNORE_COOKIE 0x0010
+#define PyPARSE_BARRY_AS_BDFL 0x0020
+#define PyPARSE_TYPE_COMMENTS 0x0040
+#define PyPARSE_ASYNC_HACKS   0x0080
+
+typedef struct _memo {
+    int type;
+    void *node;
+    int mark;
+    struct _memo *next;
+} Memo;
+
+typedef struct {
+    int type;
+    PyObject *bytes;
+    int lineno, col_offset, end_lineno, end_col_offset;
+    Memo *memo;
+} Token;
+
+typedef struct {
+    char *str;
+    int type;
+} KeywordToken;
+
+
+typedef struct {
+    struct {
+        int lineno;
+        char *comment;  // The " <tag>" in "# type: ignore <tag>"
+    } *items;
+    size_t size;
+    size_t num_items;
+} growable_comment_array;
+
+typedef struct {
+    struct tok_state *tok;
+    Token **tokens;
+    int mark;
+    int fill, size;
+    PyArena *arena;
+    KeywordToken **keywords;
+    int n_keyword_lists;
+    int start_rule;
+    int *errcode;
+    int parsing_started;
+    PyObject* normalize;
+    int starting_lineno;
+    int starting_col_offset;
+    int error_indicator;
+    int flags;
+    int feature_version;
+    growable_comment_array type_ignore_comments;
+    Token *known_err_token;
+    int level;
+} Parser;
+
+typedef struct {
+    cmpop_ty cmpop;
+    expr_ty expr;
+} CmpopExprPair;
+
+typedef struct {
+    expr_ty key;
+    expr_ty value;
+} KeyValuePair;
+
+typedef struct {
+    arg_ty arg;
+    expr_ty value;
+} NameDefaultPair;
+
+typedef struct {
+    asdl_seq *plain_names;
+    asdl_seq *names_with_defaults; // asdl_seq* of NameDefaultsPair's
+} SlashWithDefault;
+
+typedef struct {
+    arg_ty vararg;
+    asdl_seq *kwonlyargs; // asdl_seq* of NameDefaultsPair's
+    arg_ty kwarg;
+} StarEtc;
+
+typedef struct {
+    operator_ty kind;
+} AugOperator;
+
+typedef struct {
+    void *element;
+    int is_keyword;
+} KeywordOrStarred;
+
+void _PyPegen_clear_memo_statistics(void);
+PyObject *_PyPegen_get_memo_statistics(void);
+
+int _PyPegen_insert_memo(Parser *p, int mark, int type, void *node);
+int _PyPegen_update_memo(Parser *p, int mark, int type, void *node);
+int _PyPegen_is_memoized(Parser *p, int type, void *pres);
+
+int _PyPegen_lookahead_with_name(int, expr_ty (func)(Parser *), Parser *);
+int _PyPegen_lookahead_with_int(int, Token *(func)(Parser *, int), Parser *, int);
+int _PyPegen_lookahead_with_string(int , expr_ty (func)(Parser *, const char*), Parser *, const char*);
+int _PyPegen_lookahead(int, void *(func)(Parser *), Parser *);
+
+Token *_PyPegen_expect_token(Parser *p, int type);
+expr_ty _PyPegen_expect_soft_keyword(Parser *p, const char *keyword);
+Token *_PyPegen_get_last_nonnwhitespace_token(Parser *);
+int _PyPegen_fill_token(Parser *p);
+expr_ty _PyPegen_name_token(Parser *p);
+expr_ty _PyPegen_number_token(Parser *p);
+void *_PyPegen_string_token(Parser *p);
+const char *_PyPegen_get_expr_name(expr_ty);
+void *_PyPegen_raise_error(Parser *p, PyObject *errtype, const char *errmsg, ...);
+void *_PyPegen_raise_error_known_location(Parser *p, PyObject *errtype,
+                                          int lineno, int col_offset,
+                                          const char *errmsg, va_list va);
+void *_PyPegen_dummy_name(Parser *p, ...);
+
+Py_LOCAL_INLINE(void *)
+RAISE_ERROR_KNOWN_LOCATION(Parser *p, PyObject *errtype, int lineno,
+                           int col_offset, const char *errmsg, ...)
+{
+    va_list va;
+    va_start(va, errmsg);
+    _PyPegen_raise_error_known_location(p, errtype, lineno, col_offset + 1,
+                                        errmsg, va);
+    va_end(va);
+    return NULL;
+}
+
+
+#define UNUSED(expr) do { (void)(expr); } while (0)
+#define EXTRA_EXPR(head, tail) head->lineno, head->col_offset, tail->end_lineno, tail->end_col_offset, p->arena
+#define EXTRA _start_lineno, _start_col_offset, _end_lineno, _end_col_offset, p->arena
+#define RAISE_SYNTAX_ERROR(msg, ...) _PyPegen_raise_error(p, PyExc_SyntaxError, msg, ##__VA_ARGS__)
+#define RAISE_INDENTATION_ERROR(msg, ...) _PyPegen_raise_error(p, PyExc_IndentationError, msg, ##__VA_ARGS__)
+#define RAISE_SYNTAX_ERROR_KNOWN_LOCATION(a, msg, ...) \
+    RAISE_ERROR_KNOWN_LOCATION(p, PyExc_SyntaxError, (a)->lineno, (a)->col_offset, msg, ##__VA_ARGS__)
+
+Py_LOCAL_INLINE(void *)
+CHECK_CALL(Parser *p, void *result)
+{
+    if (result == NULL) {
+        assert(PyErr_Occurred());
+        p->error_indicator = 1;
+    }
+    return result;
+}
+
+/* This is needed for helper functions that are allowed to
+   return NULL without an error. Example: _PyPegen_seq_extract_starred_exprs */
+Py_LOCAL_INLINE(void *)
+CHECK_CALL_NULL_ALLOWED(Parser *p, void *result)
+{
+    if (result == NULL && PyErr_Occurred()) {
+        p->error_indicator = 1;
+    }
+    return result;
+}
+
+#define CHECK(result) CHECK_CALL(p, result)
+#define CHECK_NULL_ALLOWED(result) CHECK_CALL_NULL_ALLOWED(p, result)
+
+PyObject *_PyPegen_new_type_comment(Parser *, char *);
+
+Py_LOCAL_INLINE(PyObject *)
+NEW_TYPE_COMMENT(Parser *p, Token *tc)
+{
+    if (tc == NULL) {
+        return NULL;
+    }
+    char *bytes = PyBytes_AsString(tc->bytes);
+    if (bytes == NULL) {
+        goto error;
+    }
+    PyObject *tco = _PyPegen_new_type_comment(p, bytes);
+    if (tco == NULL) {
+        goto error;
+    }
+    return tco;
+ error:
+    p->error_indicator = 1;  // Inline CHECK_CALL
+    return NULL;
+}
+
+Py_LOCAL_INLINE(void *)
+INVALID_VERSION_CHECK(Parser *p, int version, char *msg, void *node)
+{
+    if (node == NULL) {
+        p->error_indicator = 1;  // Inline CHECK_CALL
+        return NULL;
+    }
+    if (p->feature_version < version) {
+        p->error_indicator = 1;
+        return RAISE_SYNTAX_ERROR("%s only supported in Python 3.%i and greater",
+                                  msg, version);
+    }
+    return node;
+}
+
+#define CHECK_VERSION(version, msg, node) INVALID_VERSION_CHECK(p, version, msg, node)
+
+arg_ty _PyPegen_add_type_comment_to_arg(Parser *, arg_ty, Token *);
+PyObject *_PyPegen_new_identifier(Parser *, char *);
+Parser *_PyPegen_Parser_New(struct tok_state *, int, int, int, int *, PyArena *);
+void _PyPegen_Parser_Free(Parser *);
+mod_ty _PyPegen_run_parser_from_file_pointer(FILE *, int, PyObject *, const char *,
+                                    const char *, const char *, PyCompilerFlags *, int *, PyArena *);
+void *_PyPegen_run_parser(Parser *);
+mod_ty _PyPegen_run_parser_from_file(const char *, int, PyObject *, PyCompilerFlags *, PyArena *);
+mod_ty _PyPegen_run_parser_from_string(const char *, int, PyObject *, PyCompilerFlags *, PyArena *);
+void *_PyPegen_interactive_exit(Parser *);
+asdl_seq *_PyPegen_singleton_seq(Parser *, void *);
+asdl_seq *_PyPegen_seq_insert_in_front(Parser *, void *, asdl_seq *);
+asdl_seq *_PyPegen_seq_append_to_end(Parser *, asdl_seq *, void *);
+asdl_seq *_PyPegen_seq_flatten(Parser *, asdl_seq *);
+expr_ty _PyPegen_join_names_with_dot(Parser *, expr_ty, expr_ty);
+int _PyPegen_seq_count_dots(asdl_seq *);
+alias_ty _PyPegen_alias_for_star(Parser *);
+asdl_seq *_PyPegen_map_names_to_ids(Parser *, asdl_seq *);
+CmpopExprPair *_PyPegen_cmpop_expr_pair(Parser *, cmpop_ty, expr_ty);
+asdl_int_seq *_PyPegen_get_cmpops(Parser *p, asdl_seq *);
+asdl_seq *_PyPegen_get_exprs(Parser *, asdl_seq *);
+expr_ty _PyPegen_set_expr_context(Parser *, expr_ty, expr_context_ty);
+KeyValuePair *_PyPegen_key_value_pair(Parser *, expr_ty, expr_ty);
+asdl_seq *_PyPegen_get_keys(Parser *, asdl_seq *);
+asdl_seq *_PyPegen_get_values(Parser *, asdl_seq *);
+NameDefaultPair *_PyPegen_name_default_pair(Parser *, arg_ty, expr_ty, Token *);
+SlashWithDefault *_PyPegen_slash_with_default(Parser *, asdl_seq *, asdl_seq *);
+StarEtc *_PyPegen_star_etc(Parser *, arg_ty, asdl_seq *, arg_ty);
+arguments_ty _PyPegen_make_arguments(Parser *, asdl_seq *, SlashWithDefault *,
+                            asdl_seq *, asdl_seq *, StarEtc *);
+arguments_ty _PyPegen_empty_arguments(Parser *);
+AugOperator *_PyPegen_augoperator(Parser*, operator_ty type);
+stmt_ty _PyPegen_function_def_decorators(Parser *, asdl_seq *, stmt_ty);
+stmt_ty _PyPegen_class_def_decorators(Parser *, asdl_seq *, stmt_ty);
+KeywordOrStarred *_PyPegen_keyword_or_starred(Parser *, void *, int);
+asdl_seq *_PyPegen_seq_extract_starred_exprs(Parser *, asdl_seq *);
+asdl_seq *_PyPegen_seq_delete_starred_exprs(Parser *, asdl_seq *);
+expr_ty _PyPegen_concatenate_strings(Parser *p, asdl_seq *);
+asdl_seq *_PyPegen_join_sequences(Parser *, asdl_seq *, asdl_seq *);
+int _PyPegen_check_barry_as_flufl(Parser *);
+mod_ty _PyPegen_make_module(Parser *, asdl_seq *);
+
+// Error reporting helpers
+expr_ty _PyPegen_get_invalid_target(expr_ty e);
+void *_PyPegen_arguments_parsing_error(Parser *, expr_ty);
+void *_PyPegen_nonparen_genexp_in_call(Parser *p, expr_ty args);
+
+
+void *_PyPegen_parse(Parser *);
+
+#endif