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#ifndef _PY_EVAL_H
#define _PY_EVAL_H
#include "xpath.h"
#if defined(USE_BOOST_PYTHON)
#include <boost/python.hpp>
#include <Python.h>
#include "pyfstream.h"
namespace ledger {
class python_interpreter_t : public xml::xpath_t::scope_t
{
boost::python::handle<> mmodule;
public:
boost::python::dict nspace;
python_interpreter_t(xml::xpath_t::scope_t * parent);
virtual ~python_interpreter_t() {
Py_Finalize();
}
boost::python::object import(const string& name);
enum py_eval_mode_t {
PY_EVAL_EXPR,
PY_EVAL_STMT,
PY_EVAL_MULTI
};
boost::python::object eval(std::istream& in,
py_eval_mode_t mode = PY_EVAL_EXPR);
boost::python::object eval(const string& str,
py_eval_mode_t mode = PY_EVAL_EXPR);
boost::python::object eval(const char * c_str,
py_eval_mode_t mode = PY_EVAL_EXPR) {
string str(c_str);
return eval(str, mode);
}
class functor_t : public xml::xpath_t::functor_t {
protected:
boost::python::object func;
public:
functor_t(const string& name, boost::python::object _func)
: xml::xpath_t::functor_t(name), func(_func) {}
virtual void operator()(value_t& result, xml::xpath_t::scope_t * locals);
};
virtual void define(const string& name, xml::xpath_t::op_t * def) {
// Pass any definitions up to our parent
parent->define(name, def);
}
virtual xml::xpath_t::op_t * lookup(const string& name) {
boost::python::object func = eval(name);
if (! func)
return parent ? parent->lookup(name) : NULL;
return xml::xpath_t::wrap_functor(new functor_t(name, func));
}
class lambda_t : public functor_t {
public:
lambda_t(boost::python::object code) : functor_t("<lambda>", code) {}
virtual void operator()(value_t& result, xml::xpath_t::scope_t * locals);
};
};
} // namespace ledger
#endif // USE_BOOST_PYTHON
#endif // _PY_EVAL_H
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