bpo-45434: Mark the PyTokenizer C API as private (GH-28924)

Rename PyTokenize functions to mark them as private:

* PyTokenizer_FindEncodingFilename() => _PyTokenizer_FindEncodingFilename()
* PyTokenizer_FromString() => _PyTokenizer_FromString()
* PyTokenizer_FromFile() => _PyTokenizer_FromFile()
* PyTokenizer_FromUTF8() => _PyTokenizer_FromUTF8()
* PyTokenizer_Free() => _PyTokenizer_Free()
* PyTokenizer_Get() => _PyTokenizer_Get()

Remove the unused PyTokenizer_FindEncoding() function.

import.c: remove unused #include "errcode.h".

7 files changed, 40 insertions, 48 deletions

diff --git a/Parser/pegen.c b/Parser/pegen.c
index a9896356e5b..e4d26925392 100644
--- a/Parser/pegen.c
+++ b/Parser/pegen.c
@@ -729,7 +729,7 @@ _PyPegen_fill_token(Parser *p)
 {
     const char *start;
     const char *end;
-    int type = PyTokenizer_Get(p->tok, &start, &end);
+    int type = _PyTokenizer_Get(p->tok, &start, &end);
 
     // Record and skip '# type: ignore' comments
     while (type == TYPE_IGNORE) {
@@ -746,7 +746,7 @@ _PyPegen_fill_token(Parser *p)
             PyErr_NoMemory();
             return -1;
         }
-        type = PyTokenizer_Get(p->tok, &start, &end);
+        type = _PyTokenizer_Get(p->tok, &start, &end);
     }
 
     // If we have reached the end and we are in single input mode we need to insert a newline and reset the parsing
@@ -1306,7 +1306,7 @@ _PyPegen_check_tokenizer_errors(Parser *p) {
     for (;;) {
         const char *start;
         const char *end;
-        switch (PyTokenizer_Get(p->tok, &start, &end)) {
+        switch (_PyTokenizer_Get(p->tok, &start, &end)) {
             case ERRORTOKEN:
                 if (p->tok->level != 0) {
                     int error_lineno = p->tok->parenlinenostack[p->tok->level-1];
@@ -1411,7 +1411,7 @@ _PyPegen_run_parser_from_file_pointer(FILE *fp, int start_rule, PyObject *filena
                              const char *enc, const char *ps1, const char *ps2,
                              PyCompilerFlags *flags, int *errcode, PyArena *arena)
 {
-    struct tok_state *tok = PyTokenizer_FromFile(fp, enc, ps1, ps2);
+    struct tok_state *tok = _PyTokenizer_FromFile(fp, enc, ps1, ps2);
     if (tok == NULL) {
         if (PyErr_Occurred()) {
             raise_tokenizer_init_error(filename_ob);
@@ -1441,7 +1441,7 @@ _PyPegen_run_parser_from_file_pointer(FILE *fp, int start_rule, PyObject *filena
     _PyPegen_Parser_Free(p);
 
 error:
-    PyTokenizer_Free(tok);
+    _PyTokenizer_Free(tok);
     return result;
 }
 
@@ -1453,9 +1453,9 @@ _PyPegen_run_parser_from_string(const char *str, int start_rule, PyObject *filen
 
     struct tok_state *tok;
     if (flags == NULL || flags->cf_flags & PyCF_IGNORE_COOKIE) {
-        tok = PyTokenizer_FromUTF8(str, exec_input);
+        tok = _PyTokenizer_FromUTF8(str, exec_input);
     } else {
-        tok = PyTokenizer_FromString(str, exec_input);
+        tok = _PyTokenizer_FromString(str, exec_input);
     }
     if (tok == NULL) {
         if (PyErr_Occurred()) {
@@ -1483,7 +1483,7 @@ _PyPegen_run_parser_from_string(const char *str, int start_rule, PyObject *filen
     _PyPegen_Parser_Free(p);
 
 error:
-    PyTokenizer_Free(tok);
+    _PyTokenizer_Free(tok);
     return result;
 }
 
diff --git a/Parser/string_parser.c b/Parser/string_parser.c
index 2880d07e5f6..cffe24e992e 100644
--- a/Parser/string_parser.c
+++ b/Parser/string_parser.c
@@ -386,7 +386,7 @@ fstring_compile_expr(Parser *p, const char *expr_start, const char *expr_end,
     str[0] = '(';
     str[len+1] = ')';
 
-    struct tok_state* tok = PyTokenizer_FromString(str, 1);
+    struct tok_state* tok = _PyTokenizer_FromString(str, 1);
     if (tok == NULL) {
         PyMem_Free(str);
         return NULL;
@@ -409,7 +409,7 @@ fstring_compile_expr(Parser *p, const char *expr_start, const char *expr_end,
 exit:
     PyMem_Free(str);
     _PyPegen_Parser_Free(p2);
-    PyTokenizer_Free(tok);
+    _PyTokenizer_Free(tok);
     return result;
 }
 
diff --git a/Parser/tokenizer.c b/Parser/tokenizer.c
index c7a014de42d..ae3874b09de 100644
--- a/Parser/tokenizer.c
+++ b/Parser/tokenizer.c
@@ -108,7 +108,7 @@ static char *
 error_ret(struct tok_state *tok) /* XXX */
 {
     tok->decoding_erred = 1;
-    if (tok->fp != NULL && tok->buf != NULL) /* see PyTokenizer_Free */
+    if (tok->fp != NULL && tok->buf != NULL) /* see _PyTokenizer_Free */
         PyMem_Free(tok->buf);
     tok->buf = tok->cur = tok->inp = NULL;
     tok->start = NULL;
@@ -702,7 +702,7 @@ decode_str(const char *input, int single, struct tok_state *tok)
 /* Set up tokenizer for string */
 
 struct tok_state *
-PyTokenizer_FromString(const char *str, int exec_input)
+_PyTokenizer_FromString(const char *str, int exec_input)
 {
     struct tok_state *tok = tok_new();
     char *decoded;
@@ -711,7 +711,7 @@ PyTokenizer_FromString(const char *str, int exec_input)
         return NULL;
     decoded = decode_str(str, exec_input, tok);
     if (decoded == NULL) {
-        PyTokenizer_Free(tok);
+        _PyTokenizer_Free(tok);
         return NULL;
     }
 
@@ -723,7 +723,7 @@ PyTokenizer_FromString(const char *str, int exec_input)
 /* Set up tokenizer for UTF-8 string */
 
 struct tok_state *
-PyTokenizer_FromUTF8(const char *str, int exec_input)
+_PyTokenizer_FromUTF8(const char *str, int exec_input)
 {
     struct tok_state *tok = tok_new();
     char *translated;
@@ -731,7 +731,7 @@ PyTokenizer_FromUTF8(const char *str, int exec_input)
         return NULL;
     tok->input = translated = translate_newlines(str, exec_input, tok);
     if (translated == NULL) {
-        PyTokenizer_Free(tok);
+        _PyTokenizer_Free(tok);
         return NULL;
     }
     tok->decoding_state = STATE_NORMAL;
@@ -739,7 +739,7 @@ PyTokenizer_FromUTF8(const char *str, int exec_input)
     tok->str = translated;
     tok->encoding = new_string("utf-8", 5, tok);
     if (!tok->encoding) {
-        PyTokenizer_Free(tok);
+        _PyTokenizer_Free(tok);
         return NULL;
     }
 
@@ -751,14 +751,14 @@ PyTokenizer_FromUTF8(const char *str, int exec_input)
 /* Set up tokenizer for file */
 
 struct tok_state *
-PyTokenizer_FromFile(FILE *fp, const char* enc,
-                     const char *ps1, const char *ps2)
+_PyTokenizer_FromFile(FILE *fp, const char* enc,
+                      const char *ps1, const char *ps2)
 {
     struct tok_state *tok = tok_new();
     if (tok == NULL)
         return NULL;
     if ((tok->buf = (char *)PyMem_Malloc(BUFSIZ)) == NULL) {
-        PyTokenizer_Free(tok);
+        _PyTokenizer_Free(tok);
         return NULL;
     }
     tok->cur = tok->inp = tok->buf;
@@ -771,7 +771,7 @@ PyTokenizer_FromFile(FILE *fp, const char* enc,
            gets copied into the parse tree. */
         tok->encoding = new_string(enc, strlen(enc), tok);
         if (!tok->encoding) {
-            PyTokenizer_Free(tok);
+            _PyTokenizer_Free(tok);
             return NULL;
         }
         tok->decoding_state = STATE_NORMAL;
@@ -782,7 +782,7 @@ PyTokenizer_FromFile(FILE *fp, const char* enc,
 /* Free a tok_state structure */
 
 void
-PyTokenizer_Free(struct tok_state *tok)
+_PyTokenizer_Free(struct tok_state *tok)
 {
     if (tok->encoding != NULL) {
         PyMem_Free(tok->encoding);
@@ -2049,7 +2049,8 @@ tok_get(struct tok_state *tok, const char **p_start, const char **p_end)
 }
 
 int
-PyTokenizer_Get(struct tok_state *tok, const char **p_start, const char **p_end)
+_PyTokenizer_Get(struct tok_state *tok,
+                 const char **p_start, const char **p_end)
 {
     int result = tok_get(tok, p_start, p_end);
     if (tok->decoding_erred) {
@@ -2062,7 +2063,7 @@ PyTokenizer_Get(struct tok_state *tok, const char **p_start, const char **p_end)
 /* Get the encoding of a Python file. Check for the coding cookie and check if
    the file starts with a BOM.
 
-   PyTokenizer_FindEncodingFilename() returns NULL when it can't find the
+   _PyTokenizer_FindEncodingFilename() returns NULL when it can't find the
    encoding in the first or second line of the file (in which case the encoding
    should be assumed to be UTF-8).
 
@@ -2070,7 +2071,7 @@ PyTokenizer_Get(struct tok_state *tok, const char **p_start, const char **p_end)
    by the caller. */
 
 char *
-PyTokenizer_FindEncodingFilename(int fd, PyObject *filename)
+_PyTokenizer_FindEncodingFilename(int fd, PyObject *filename)
 {
     struct tok_state *tok;
     FILE *fp;
@@ -2087,7 +2088,7 @@ PyTokenizer_FindEncodingFilename(int fd, PyObject *filename)
     if (fp == NULL) {
         return NULL;
     }
-    tok = PyTokenizer_FromFile(fp, NULL, NULL, NULL);
+    tok = _PyTokenizer_FromFile(fp, NULL, NULL, NULL);
     if (tok == NULL) {
         fclose(fp);
         return NULL;
@@ -2100,12 +2101,12 @@ PyTokenizer_FindEncodingFilename(int fd, PyObject *filename)
         tok->filename = PyUnicode_FromString("<string>");
         if (tok->filename == NULL) {
             fclose(fp);
-            PyTokenizer_Free(tok);
+            _PyTokenizer_Free(tok);
             return encoding;
         }
     }
     while (tok->lineno < 2 && tok->done == E_OK) {
-        PyTokenizer_Get(tok, &p_start, &p_end);
+        _PyTokenizer_Get(tok, &p_start, &p_end);
     }
     fclose(fp);
     if (tok->encoding) {
@@ -2114,18 +2115,11 @@ PyTokenizer_FindEncodingFilename(int fd, PyObject *filename)
             strcpy(encoding, tok->encoding);
         }
     }
-    PyTokenizer_Free(tok);
+    _PyTokenizer_Free(tok);
     return encoding;
 }
 
-char *
-PyTokenizer_FindEncoding(int fd)
-{
-    return PyTokenizer_FindEncodingFilename(fd, NULL);
-}
-
 #ifdef Py_DEBUG
-
 void
 tok_dump(int type, char *start, char *end)
 {
@@ -2133,5 +2127,4 @@ tok_dump(int type, char *start, char *end)
     if (type == NAME || type == NUMBER || type == STRING || type == OP)
         printf("(%.*s)", (int)(end - start), start);
 }
-
-#endif
+#endif  // Py_DEBUG
diff --git a/Parser/tokenizer.h b/Parser/tokenizer.h
index 677f9dba490..1d1cfd639d9 100644
--- a/Parser/tokenizer.h
+++ b/Parser/tokenizer.h
@@ -86,12 +86,12 @@ struct tok_state {
     enum interactive_underflow_t interactive_underflow;
 };
 
-extern struct tok_state *PyTokenizer_FromString(const char *, int);
-extern struct tok_state *PyTokenizer_FromUTF8(const char *, int);
-extern struct tok_state *PyTokenizer_FromFile(FILE *, const char*,
+extern struct tok_state *_PyTokenizer_FromString(const char *, int);
+extern struct tok_state *_PyTokenizer_FromUTF8(const char *, int);
+extern struct tok_state *_PyTokenizer_FromFile(FILE *, const char*,
                                               const char *, const char *);
-extern void PyTokenizer_Free(struct tok_state *);
-extern int PyTokenizer_Get(struct tok_state *, const char **, const char **);
+extern void _PyTokenizer_Free(struct tok_state *);
+extern int _PyTokenizer_Get(struct tok_state *, const char **, const char **);
 
 #define tok_dump _Py_tok_dump
 
diff --git a/Python/Python-tokenize.c b/Python/Python-tokenize.c
index fa713282558..d3ebbe1331a 100644
--- a/Python/Python-tokenize.c
+++ b/Python/Python-tokenize.c
@@ -47,7 +47,7 @@ tokenizeriter_new_impl(PyTypeObject *type, const char *source)
     if (filename == NULL) {
         return NULL;
     }
-    self->tok = PyTokenizer_FromUTF8(source, 1);
+    self->tok = _PyTokenizer_FromUTF8(source, 1);
     if (self->tok == NULL) {
         Py_DECREF(filename);
         return NULL;
@@ -61,7 +61,7 @@ tokenizeriter_next(tokenizeriterobject *it)
 {
     const char *start;
     const char *end;
-    int type = PyTokenizer_Get(it->tok, &start, &end);
+    int type = _PyTokenizer_Get(it->tok, &start, &end);
     if (type == ERRORTOKEN && PyErr_Occurred()) {
         return NULL;
     }
@@ -105,7 +105,7 @@ static void
 tokenizeriter_dealloc(tokenizeriterobject *it)
 {
     PyTypeObject *tp = Py_TYPE(it);
-    PyTokenizer_Free(it->tok);
+    _PyTokenizer_Free(it->tok);
     tp->tp_free(it);
     Py_DECREF(tp);
 }
diff --git a/Python/import.c b/Python/import.c
index 731f0f59118..4bc1e518bf5 100644
--- a/Python/import.c
+++ b/Python/import.c
@@ -11,7 +11,6 @@
 #include "pycore_interp.h"        // _PyInterpreterState_ClearModules()
 #include "pycore_pystate.h"       // _PyInterpreterState_GET()
 #include "pycore_sysmodule.h"
-#include "errcode.h"
 #include "marshal.h"
 #include "code.h"
 #include "importdl.h"
diff --git a/Python/traceback.c b/Python/traceback.c
index ffa7c3494ea..b18cbb91ce8 100644
--- a/Python/traceback.c
+++ b/Python/traceback.c
@@ -29,7 +29,7 @@
 #define MAX_NTHREADS 100
 
 /* Function from Parser/tokenizer.c */
-extern char * PyTokenizer_FindEncodingFilename(int, PyObject *);
+extern char* _PyTokenizer_FindEncodingFilename(int, PyObject *);
 
 _Py_IDENTIFIER(TextIOWrapper);
 _Py_IDENTIFIER(close);
@@ -431,7 +431,7 @@ _Py_DisplaySourceLine(PyObject *f, PyObject *filename, int lineno, int indent, i
         Py_DECREF(binary);
         return 0;
     }
-    found_encoding = PyTokenizer_FindEncodingFilename(fd, filename);
+    found_encoding = _PyTokenizer_FindEncodingFilename(fd, filename);
     if (found_encoding == NULL)
         PyErr_Clear();
     encoding = (found_encoding != NULL) ? found_encoding : "utf-8";