bpo-43244: Remove parser_interface.h header file (GH-25001)

Remove parser functions using the "struct _mod" type, because the
AST C API was removed:

* PyParser_ASTFromFile()
* PyParser_ASTFromFileObject()
* PyParser_ASTFromFilename()
* PyParser_ASTFromString()
* PyParser_ASTFromStringObject()

These functions were undocumented and excluded from the limited C
API.

Add pycore_parser.h internal header file. Rename functions:

* PyParser_ASTFromFileObject() => _PyParser_ASTFromFile()
* PyParser_ASTFromStringObject() => _PyParser_ASTFromString()

These functions are no longer exported (replace PyAPI_FUNC() with
extern).

Remove also _PyPegen_run_parser_from_file() function. Update
test_peg_generator to use _PyPegen_run_parser_from_file_pointer()
instead.

3 files changed, 31 insertions, 53 deletions

diff --git a/Include/Python.h b/Include/Python.h
index 86dbbcf..c87a7dd 100644
--- a/Include/Python.h
+++ b/Include/Python.h
@@ -141,7 +141,6 @@
 #include "modsupport.h"
 #include "compile.h"
 #include "pythonrun.h"
-#include "cpython/parser_interface.h"
 #include "pylifecycle.h"
 #include "ceval.h"
 #include "sysmodule.h"
diff --git a/Include/cpython/parser_interface.h b/Include/cpython/parser_interface.h
deleted file mode 100644
index 1c6576d..0000000
--- a/Include/cpython/parser_interface.h
+++ /dev/null
@@ -1,52 +0,0 @@
-#ifndef Py_PEGENINTERFACE
-#define Py_PEGENINTERFACE
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#include "Python.h"
-
-#ifndef Py_LIMITED_API
-PyAPI_FUNC(struct _mod *) PyParser_ASTFromString(
-    const char *str,
-    const char *filename,
-    int mode,
-    PyCompilerFlags *flags,
-    PyArena *arena);
-PyAPI_FUNC(struct _mod *) PyParser_ASTFromStringObject(
-    const char *str,
-    PyObject* filename,
-    int mode,
-    PyCompilerFlags *flags,
-    PyArena *arena);
-PyAPI_FUNC(struct _mod *) PyParser_ASTFromFile(
-    FILE *fp,
-    const char *filename,
-    const char* enc,
-    int mode,
-    const char *ps1,
-    const char *ps2,
-    PyCompilerFlags *flags,
-    int *errcode,
-    PyArena *arena);
-PyAPI_FUNC(struct _mod *) PyParser_ASTFromFileObject(
-    FILE *fp,
-    PyObject *filename_ob,
-    const char *enc,
-    int mode,
-    const char *ps1,
-    const char *ps2,
-    PyCompilerFlags *flags,
-    int *errcode,
-    PyArena *arena);
-PyAPI_FUNC(struct _mod *) PyParser_ASTFromFilename(
-    const char *filename,
-    int mode,
-    PyCompilerFlags *flags,
-    PyArena *arena);
-#endif /* !Py_LIMITED_API */
-
-#ifdef __cplusplus
-}
-#endif
-#endif /* !Py_PEGENINTERFACE */
diff --git a/Include/internal/pycore_parser.h b/Include/internal/pycore_parser.h
new file mode 100644
index 0000000..e2de24e
--- /dev/null
+++ b/Include/internal/pycore_parser.h
@@ -0,0 +1,31 @@
+#ifndef Py_INTERNAL_PARSER_H
+#define Py_INTERNAL_PARSER_H
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef Py_BUILD_CORE
+#  error "this header requires Py_BUILD_CORE define"
+#endif
+
+extern struct _mod* _PyParser_ASTFromString(
+    const char *str,
+    PyObject* filename,
+    int mode,
+    PyCompilerFlags *flags,
+    PyArena *arena);
+extern struct _mod* _PyParser_ASTFromFile(
+    FILE *fp,
+    PyObject *filename_ob,
+    const char *enc,
+    int mode,
+    const char *ps1,
+    const char *ps2,
+    PyCompilerFlags *flags,
+    int *errcode,
+    PyArena *arena);
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* !Py_INTERNAL_PARSER_H */