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bpo-40939: Remove documentation for PyParser_* & add porting notes (GH-26855)

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I tried to be relatively thorough and give lots of links.
One reason is that this wasn't deprecated very long; also it seems people running into this tend to not be familiar with similar APIs.

Co-authored-by: Ken Jin <28750310+Fidget-Spinner@users.noreply.github.com>
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Petr Viktorin 2021-06-24 14:57:28 +02:00 • committed by GitHub
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35
Doc/faq/extending.rst
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@ -275,39 +275,8 @@ for more hints.
However sometimes you have to run the embedded Python interpreter in the same
thread as your rest application and you can't allow the
:c:func:`PyRun_InteractiveLoop` to stop while waiting for user input. The one
solution then is to call :c:func:`PyParser_ParseString` and test for ``e.error``
equal to ``E_EOF``, which means the input is incomplete. Here's a sample code
fragment, untested, inspired by code from Alex Farber::
#define PY_SSIZE_T_CLEAN
#include <Python.h>
#include <node.h>
#include <errcode.h>
#include <grammar.h>
#include <parsetok.h>
#include <compile.h>
int testcomplete(char *code)
/* code should end in \n */
/* return -1 for error, 0 for incomplete, 1 for complete */
{
node *n;
perrdetail e;
n = PyParser_ParseString(code, &_PyParser_Grammar,
Py_file_input, &e);
if (n == NULL) {
if (e.error == E_EOF)
return 0;
return -1;
}
PyNode_Free(n);
return 1;
}
Another solution is trying to compile the received string with
:c:func:`PyRun_InteractiveLoop` to stop while waiting for user input.
A solution is trying to compile the received string with
:c:func:`Py_CompileString`. If it compiles without errors, try to execute the
returned code object by calling :c:func:`PyEval_EvalCode`. Otherwise save the
input for later. If the compilation fails, find out if it's an error or just