You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
112 lines
3.4 KiB
112 lines
3.4 KiB
/*
|
|
pybind11/exec.h: Support for evaluating Python expressions and statements
|
|
from strings and files
|
|
|
|
Copyright (c) 2016 Klemens Morgenstern <klemens.morgenstern@ed-chemnitz.de> and
|
|
Wenzel Jakob <wenzel.jakob@epfl.ch>
|
|
|
|
All rights reserved. Use of this source code is governed by a
|
|
BSD-style license that can be found in the LICENSE file.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#pragma once
|
|
|
|
#include "pybind11.h"
|
|
|
|
NAMESPACE_BEGIN(pybind11)
|
|
|
|
enum eval_mode {
|
|
/// Evaluate a string containing an isolated expression
|
|
eval_expr,
|
|
|
|
/// Evaluate a string containing a single statement. Returns \c none
|
|
eval_single_statement,
|
|
|
|
/// Evaluate a string containing a sequence of statement. Returns \c none
|
|
eval_statements
|
|
};
|
|
|
|
template <eval_mode mode = eval_expr>
|
|
object eval(str expr, object global = object(), object local = object()) {
|
|
if (!global) {
|
|
global = reinterpret_borrow<object>(PyEval_GetGlobals());
|
|
if (!global)
|
|
global = dict();
|
|
}
|
|
if (!local)
|
|
local = global;
|
|
|
|
/* PyRun_String does not accept a PyObject / encoding specifier,
|
|
this seems to be the only alternative */
|
|
std::string buffer = "# -*- coding: utf-8 -*-\n" + (std::string) expr;
|
|
|
|
int start;
|
|
switch (mode) {
|
|
case eval_expr: start = Py_eval_input; break;
|
|
case eval_single_statement: start = Py_single_input; break;
|
|
case eval_statements: start = Py_file_input; break;
|
|
default: pybind11_fail("invalid evaluation mode");
|
|
}
|
|
|
|
PyObject *result = PyRun_String(buffer.c_str(), start, global.ptr(), local.ptr());
|
|
if (!result)
|
|
throw error_already_set();
|
|
return reinterpret_steal<object>(result);
|
|
}
|
|
|
|
template <eval_mode mode = eval_statements>
|
|
object eval_file(str fname, object global = object(), object local = object()) {
|
|
if (!global) {
|
|
global = reinterpret_borrow<object>(PyEval_GetGlobals());
|
|
if (!global)
|
|
global = dict();
|
|
}
|
|
if (!local)
|
|
local = global;
|
|
|
|
int start;
|
|
switch (mode) {
|
|
case eval_expr: start = Py_eval_input; break;
|
|
case eval_single_statement: start = Py_single_input; break;
|
|
case eval_statements: start = Py_file_input; break;
|
|
default: pybind11_fail("invalid evaluation mode");
|
|
}
|
|
|
|
int closeFile = 1;
|
|
std::string fname_str = (std::string) fname;
|
|
#if PY_VERSION_HEX >= 0x03040000
|
|
FILE *f = _Py_fopen_obj(fname.ptr(), "r");
|
|
#elif PY_VERSION_HEX >= 0x03000000
|
|
FILE *f = _Py_fopen(fname.ptr(), "r");
|
|
#else
|
|
/* No unicode support in open() :( */
|
|
auto fobj = reinterpret_steal<object>(PyFile_FromString(
|
|
const_cast<char *>(fname_str.c_str()),
|
|
const_cast<char*>("r")));
|
|
FILE *f = nullptr;
|
|
if (fobj)
|
|
f = PyFile_AsFile(fobj.ptr());
|
|
closeFile = 0;
|
|
#endif
|
|
if (!f) {
|
|
PyErr_Clear();
|
|
pybind11_fail("File \"" + fname_str + "\" could not be opened!");
|
|
}
|
|
|
|
#if PY_VERSION_HEX < 0x03000000 && defined(PYPY_VERSION)
|
|
PyObject *result = PyRun_File(f, fname_str.c_str(), start, global.ptr(),
|
|
local.ptr());
|
|
(void) closeFile;
|
|
#else
|
|
PyObject *result = PyRun_FileEx(f, fname_str.c_str(), start, global.ptr(),
|
|
local.ptr(), closeFile);
|
|
#endif
|
|
|
|
if (!result)
|
|
throw error_already_set();
|
|
return reinterpret_steal<object>(result);
|
|
}
|
|
|
|
NAMESPACE_END(pybind11)
|