Add basic embedding support.

[SVN r30601]

src/exec.cpp

@@ -0,0 +1,45 @@
+// Copyright Stefan Seefeld 2005.
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#include <boost/python/exec.hpp>
+#include <boost/python/borrowed.hpp>
+#include <boost/python/extract.hpp>
+#include <boost/python/handle.hpp>
+
+namespace boost 
+{ 
+namespace python 
+{
+
+object exec(str string, object global, object local)
+{
+  // should be 'char const *' but older python versions don't use 'const' yet.
+  char *s = python::extract<char *>(string);
+  PyObject* result = PyRun_String(s, Py_file_input, global.ptr(), local.ptr());
+  if (!result) throw_error_already_set();
+  return object(detail::new_reference(result));
+}
+
+// Execute python source code from file filename.
+// global and local are the global and local scopes respectively,
+// used during execution.
+object exec_file(str filename, object global, object local)
+{
+  // should be 'char const *' but older python versions don't use 'const' yet.
+  char *f = python::extract<char *>(filename);
+  // Let python open the file to avoid potential binary incompatibilities.
+  PyObject *pyfile = PyFile_FromString(f, "r");
+  if (!pyfile) throw std::invalid_argument(std::string(f) + " : no such file");
+  python::handle<> file(pyfile);
+  PyObject* result = PyRun_File(PyFile_AsFile(file.get()),
+				f,
+				Py_file_input,
+				global.ptr(), local.ptr());
+  if (!result) throw_error_already_set();
+  return object(detail::new_reference(result));
+}
+
+}  // namespace boost::python
+}  // namespace boost